In this method for manufacturing a dissimilar material joined body 10: a rivet 40 comprising a head portion 41 and a central shaft portion 42 that has a substantially columnar shape and that includes a plurality of protruding portions 43B and recessed portions 43C on an outer circumferential surface 43A is driven into a first member 20, causing the protruding portions 43B and the recessed portions 43C of the rivet 40 to engage with the first member 20 and causing the central shaft portion 42 of the rivet 40 to pass through the first member 20; the central shaft portion 42 of the rivet 40, which has been inserted through the first member 20, is brought into contact with a second member 30 formed from a different material to the first member 20; and a current is passed between the head portion 41 of the rivet 40 and the second member 30 while pressure is applied thereto, thereby welding the rivet 40 and the second member 30 and forming the dissimilar material joined body 10.
The present invention relates to a water stop mounting structure of a bolt to a plate-like metal member. As a bolt, a caulking bolt 12 is used in which a screwless portion 25 between an upper end of a male screw of the caulking bolt and a bearing surface of a head portion of the bolt is made thicker than an effective diameter of the male screw 22. By inserting this caulking bolt into the pilot hole of the plate-like metal member and caulking, metal of a circumferential edge portion of a pilot hole of the plate-like metal member is plastically deformed toward the screwless portion to be brought in close contact with the screwless portion 25, and water is stopped. When a sealant is applied to a bearing surface of the caulking bolt, it is possible to have a structure in which the sealant flows between the circumferential edge portion of the pilot hole of the plate-like metal member and the bolt at the time of being caulked and water is stopped.
A device for fixing a nut to an inner surface of a pipe member having a small inner diameter is provided. The device includes a unit box (10) to be inserted into the pipe member, a rotation shaft (11) extending from the unit box (10) to the outside of the pipe member, a cam fixed to the rotation shaft (11) in the unit box (10), and a nut holder (18) that advances from the unit box (10) toward the inner surface of the pipe member by the rotation of the cam. A pressure receiving member to be abutted on the inner surface of the pipe member is provided on an opposite surface of the nut holder (18).
Provided is a crimp securing structure of a bolt in which a crimp bolt 10 having a crimping recess 13 on the upper surface of the head is crimped onto a metal sheet 30. The thickness of a metal material press-fitted into the crimping recess 13 of the crimp bolt is made smaller at the peripheral edge of the crimping recess 13 and is made larger in the center portion thereof. In order to obtain this crimp securing structure, a crimping die 20 in which a stress-relief recess 23 is formed in a center portion of a convex portion is used to prevent the occurrence of excessive local stress in the crimping recess 13.
B21D 39/00 - Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
F16B 35/04 - Screw-bolts; Stay bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
F16B 37/04 - Devices for fastening nuts to surfaces, e.g. sheets, plates
6.
Piercing nut and method for fixing the same to inner surface of mating member having closed sectional shape
A piercing nut according to the present invention includes an internal thread 11, a ring-shaped punching part 12, a ring-shaped groove 16, and a bearing surface 17. The internal thread 11 is formed at the center of a nut main body 10. The ring-shaped punching part 12 protrudes around the outer periphery of the internal thread 11. The ring-shaped groove 16 is formed around the outer periphery of the ring-shaped punching part 12. The bearing surface 17 protrudes around the outer periphery of the ring-shaped groove 16. The height h of the ring-shaped punching part 12 is equal to or lower than the height H of the bearing surface 17 in the opposite manner to the conventional technique.
A device for fixing a nut to an inner surface of a pipe member having a small inner diameter is provided. The device includes a unit box(10) to be inserted into the pipe member, a rotation shaft(11)extending from the unit box(10) to the outside of the pipe member, a cam fixed to the rotation shaft(11) in the unit box(10), and a nut holder(18) that advances from the unit box(10) toward the inner surface of the pipe member by the rotation of the cam. A pressure receiving member to be abutted on the inner surface of the pipe member is provided on an opposite surface of the nut holder(18).
Provided is an invention relating to a bolt having a crushed portion of a ridge formed on a regular threaded portion of the bolt. The crushed portion of the ridge is set to have a height at which no screwing torque is generated when the bolt is screwed into an internal thread, and the crushed portion of the ridge is formed on an entire half-circumference or a partial half-circumference of the regular threaded portion so as to form a spiral shape that advances toward a shaft tip in a direction opposite to the ridge of the regular threaded portion when viewed from a head. The bolt of the present invention is used as a locking bolt or an earth bolt.
A piercing nut according to the present invention includes an internal thread 11, a ring-shaped punching part 12, a ring-shaped groove 16, and a bearing surface 17. The internal thread 11 is formed at the center of a nut main body 10. The ring-shaped punching part 12 protrudes around the outer periphery of the internal thread 11. The ring-shaped groove 16 is formed around the outer periphery of the ring-shaped punching part 12. The bearing surface 17 protrudes around the outer periphery of the ring-shaped groove 16. The height h of the ring-shaped punching part 12 is equal to or lower than the height H of the bearing surface 17 in the opposite manner to the conventional technique.
The present invention is a crimp securing structure of a bolt, the structure being such that a crimp bolt 10 in which a crimping recess 13 is provided in the upper surface of a top part is secured by crimping to a metal sheet 30. The present invention is characterized in that the thickness of a metal material press-fitted into the crimping recess 13 of the crimp bolt is reduced at a central section so as to be less than that at a peripheral edge section of the crimping recess 13. In order to obtain this crimp securing structure, a crimping die 20 in which a stress-relief recess 23 is formed at a protruding central section is used to prevent the occurrence of excessive localized stress in the crimping recess 13.
B21D 39/00 - Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
F16B 35/04 - Screw-bolts; Stay bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
An article fixing device includes an adjustment mechanism, a protrusion, and a fastening bolt. The adjustment mechanism is joined to a side of a lower surface of the roof panel. The protrusion is provided integrally with the adjustment mechanism and fixes a roof rail. The fastening bolt fastens a support member to the adjustment mechanism. Further, the adjustment mechanism includes a fitting convex member provided integrally with the protrusion, a fitting concave member that that is able to be screwed into the fitting convex member, and a resin ring that is provided in the fitting concave member and that cooperates with rotation of the fastening bolt.
06 - Common metals and ores; objects made of metal
Goods & Services
Metal earth bolts in the automotive industry, in which the earth bolt is cut into a female screw by shaving off its surface when it is being screwed into the female screw, and that ensures electrical conduction between it and the female screw; Special earth bolts of metal in the automotive industry, in which the earth bolt is cut into a female screw by shaving off its surface when it is being screwed into the female screw, and that ensures electrical conduction between it and the female screw
Provided is an invention relating to a bolt having a crushed portion (14) of a ridge formed on a regular threaded portion (11) of the bolt. The crushed portion of the ridge is set to have a height at which no screwing torque is generated when the bolt is screwed into an internal thread, and the crushed portion of the ridge is formed on an entire half-circumference or a partial half-circumference of the regular threaded portion so as to form a spiral shape that advances toward a shaft tip (13) in a direction opposite to the ridge of the regular threaded portion when viewed from a head. The bolt of the present invention is used as a locking bolt or an earth bolt.
To reduce the load required to press-fit a nut into a plate material, the nut includes a base part 2 provided with a female screw 18, a cylindrical protrusion part 3 protruding from one surface of the base part and a plurality of foot parts 4 protruding from an outer peripheral surface side of the protrusion part. An end of the respective foot parts closer to the protrusion part is formed so that a width gradually expands from a tip end side toward a protrusion part side, and that both outer sides of the end are arc-shaped in plan view.
The coating film peeling nut of the present invention has a notch 13 formed in an inner surface of a nut main body 10 on which a female screw 12 is formed, the notch 13 extending in a direction different from that of a lead angle of the female screw 12. The notch 13 is formed helically, and a winding direction thereof is the same as that of the female screw 12. A pitch of the notch 13 is 2 to 10 times a pitch of the female screw 12, and a depth of the notch 13 is 20 to 80% of a thread height of the female screw 12.
To threadedly engage a bolt and a female screw with each other, thereby making it possible to shave off a deposit on the inner surface of the female screw and to make it easy for a worker to sense the seating, there is provided a bolt including a shaft 2 and a head, wherein a first thread 11 is provided on a head side of the shaft, and at least one of a thread provided larger in diameter than the first thread and a thread provided wider than the first thread is provided on a tip end side of the shaft.
A fastener to fasten a member to be fastened includes a shaft portion, a tool working surface, and an external operation restricting portion. The shaft portion is provided with a male thread configured to be rotated about an axis line to work so as to fasten the member to be fastened. The tool working surface is formed to a tool working portion integrated with the shaft portion. A tool to rotate the shaft portion works to the tool working surface. The external operation restricting portion is configured to restrict the rotation of the shaft portion through an operation from outside the fastener. In this fastener, the tool working surface to which the tool works is formed in an approximately cylindrical inner surface shape.
A caulking bolt includes a shank and a head, wherein a bearing face of the head has, along an outer circumference of the shank, a groove having a ring shape into which a crimped member is fitted. The caulking bolt includes projections and depressions for whirl-stop in the groove.
B21K 25/00 - Uniting components to form integral members, e.g. turbine wheels and shafts, caulks with inserts, with or without shaping of the components
F16B 35/04 - Screw-bolts; Stay bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
F16B 37/06 - Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting
F16B 39/282 - Locking by means of special shape of work-engaging surfaces, e.g. notched or toothed nuts
To reduce the load required to press-fit a nut into a plate material, the nut includes a base part 2 provided with a female screw 18, a cylindrical protrusion part 3 protruding from one surface of the base part and a plurality of foot parts 4 protruding from an outer peripheral surface side of the protrusion part. An end of the respective foot parts closer to the protrusion part is formed so that a width gradually expands from a tip end side toward a protrusion part side, and that both outer sides of the end are arc-shaped in plan view.
The coating film peeling nut of the present invention has a notch 13 formed in an inner surface of a nut main body 10 on which a female screw 12 is formed, the notch 13 extending in a direction different from that of a lead angle of the female screw 12. The notch 13 is formed helically, and a winding direction thereof is the same as that of the female screw 12. A pitch of the notch 13 is 2 to 10 times a pitch of the female screw 12, and a depth of the notch 13 is 20 to 80% of a thread height of the female screw 12.
The staking bolt of the present invention includes a head 10 and a shank 11 having an external thread 12. At the upper end of the shank 11, a ring-shaped protrusion 20 and a ring groove 21 located closer to the head relative to the ring-shaped protrusion 20 are formed. The head 10 is flat, and on the bearing face 13, a whirl-stop protrusion 14 having a plurality of radially extending arms 15 protrudes with a thickness of t. The minimum diameter D between respective arms 15 is larger than the outer diameter d of the ring-shaped protrusion 20, and t×(D−d)/2 which is the longitudinal cross-sectional area A of the minimum diameter portion of the whirl-stop protrusion 14 is equal to or greater than the longitudinal cross-sectional area of the ring groove 21.
F16B 35/04 - Screw-bolts; Stay bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
F16B 37/06 - Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting
F16B 39/282 - Locking by means of special shape of work-engaging surfaces, e.g. notched or toothed nuts
To threadedly engage a bolt (1) and a female screw (5) with each other, thereby making it possible to shave off a deposit on the inner surface of the female screw (5) and to make it easy for a worker to sense the seating, there is provided a bolt (1) including a shaft (2) and a head (3), wherein a first thread (11) is provided on a head side of the shaft, and at least one of a thread (12) provided larger in diameter than the first thread (11) and a thread (13) provided wider than the first thread (11) is provided on a tip end side of the shaft.
A caulking bolt (1) includes a shank (2) and a head (3), wherein a bearing face (31) of the head has, along an outer circumference of the shank, a groove (32) having a ring shape into which a crimped member (5) is fitted. The caulking bolt includes projections and depressions for whirl-stop in the groove.
F16B 37/06 - Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting
F16B 35/04 - Screw-bolts; Stay bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
31.
Method for attaching nut and collar to plate material and attachment structure of nut and collar to plate material
A nut is caulked and fixed to a plate material and a protrusion at an end of a collar is press-fitted into a recessed groove generated on the opposite surface of the plate material at the time of the caulking fixation, thereby fixing the nut and the collar to both surfaces of the plate material, respectively. The plate material is, for example, a metal panel, and the nut is, for example, a pierce nut. Since the collar is caulked and fixed, thermal strain is not generated.
The nut of the present invention is an encased nut including: a case body which is welded to a body; and a nut which is freely movably held inside the case body. The nut is composed of a hexagonal nut body and an insulating member made of a resin and insert-molded on the outer surface of this hexagonal nut body. The insulating member is provided with a plurality of protrusions on the side, abutting on the body, of the outer circumferential part. The nut is insulated, and thus is not affixed by electrodeposition coating.
Threaded parts such as bolts are rust-proofed by using a treatment liquid including a binder resin containing silica and at least one of a modified epoxy resin obtained by graft polymerization using a carboxylic acid-containing acrylic polymer as a side chain and a modified acrylic resin obtained by graft polymerization using a carboxylic acid-containing acrylic polymer as a side chain. By using this treatment liquid, coating treatment can be carried out at one time without need to use an organic solvent. There is an advantage that the friction coefficient does not increase even when tightening is repeated.
C09D 163/10 - Epoxy resins modified by unsaturated compounds
B05D 7/00 - Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
B05D 7/16 - Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies using synthetic lacquers or varnishes
C09D 163/00 - Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
C09D 167/04 - Polyesters derived from hydroxy carboxylic acids, e.g. lactones
C23C 22/62 - Treatment of iron or alloys based thereon
B32B 27/08 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance of synthetic resin of a different kind
B32B 27/20 - Layered products essentially comprising synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
This staking bolt comprises a head section 10 and a shaft section 11 on which an external thread 12 is formed. A ring-shaped protrusion 20 and a ring groove 21, which is located on the head-section side of the ring-shaped protrusion 20, are formed on the upper end of the shaft section 11. The head section 10 is flat, and a rotation-prevention protrusion 14, which is provided with a plurality of radial arm sections 15, protrudes at a thickness of t on the seating surface 13 of the head section. The minimum diameter D between the arm sections 15 is greater than the outer diameter d of the ring-shaped protrusion 20, and t*(D-d)/2, which is the vertical cross-sectional area A of the minimum diameter section of the rotation-prevention protrusion 14, is greater than or equal to the vertical cross-sectional area of the ring groove 21.
F16B 35/04 - Screw-bolts; Stay bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
There is provided a caulking bolt which can be fastened by a general nut even when used to fix thin plates to each other, and which can also provide fitting strength similar to that of conventional products. The caulking bolt includes a head part and a shaft part, and has a non-circular, flat, rotation preventive protrusion formed on a seat surface of the head part. Also, the upper end of a normal complete thread part formed in the shaft part is brought close to the seat surface of the head part with a distance of 3 pitches or less, and an incomplete thread part formed at the portion of 3 pitches or less is used as a stopper part into which a metal flows when the caulking bolt is driven into a metal plate.
F16B 37/04 - Devices for fastening nuts to surfaces, e.g. sheets, plates
F16B 35/04 - Screw-bolts; Stay bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
F16B 37/06 - Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting
Provided is a case nut in which a nut that is held inside a case body so as to swing freely is not fixed as a result of electrodeposition coating treatment. The case nut is provided with a case body that is welded to a body, and a nut that is held inside the case body so as to float freely. The nut is provided with a metal nut body and a resin insulating member that is formed on the outside of the nut body and prevents contact of the upper surface, lower surface and outer surfaces of the nut body with the inner wall surfaces of the case body and with the body.
F16B 39/24 - Locking of screws, bolts, or nuts in which the locking takes place during screwing down or tightening by means of washers, spring washers, or resilient plates that lock against the object
F16B 37/04 - Devices for fastening nuts to surfaces, e.g. sheets, plates
F16B 37/06 - Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting
There is provided a structure capable of ensuring a bearing surface pressure on an inner diameter side and an outer diameter side of a washer even if a thickness of the washer is suppressed. In a washer used at a fastening portion of a vehicle, a configuration in which a bearing surface is sectionalized into two faces, an inner abutting face and an outer abutting face, by an annular groove is adopted.
In the present invention, a threaded part such as a bolt is subjected to rust roofing treatment with a treatment liquid prepared using a binder resin containing silica and at least one of a modified epoxy resin obtained by graft polymerization of a carboxylic acid-containing acrylic polymer as a side chain and a modified acrylic resin obtained by graft polymerization of a carboxylic acid-containing acrylic polymer as a side chain. The use of the treatment liquid eliminates the need of an organic solvent, and makes it possible to complete coating treatment by a single procedure. An advantage is that even after repeated tightening, the abrasion coefficient does not increase.
C23F 11/00 - Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
Provided is a bolt capable of exhibiting an anti-loosening function even when repeatedly attached and removed. In this bolt 1, a groove 4 extending along the spiral of a screw thread 3 is provided to the peak 31 of the screw thread 3. The configuration has a plurality of the grooves 4 provided at an interval along the spiral direction of the screw thread 3.
There are provided a bolt caulking method and a bolt caulking device which ensure supply and caulking of a bolt as a single operation. The method is a bolt caulking method including supplying a bolt into a nose piece having a vertical hole, and lowering a punch from above to drive the bolt into a metal plate. The bolt is supplied through a pipe connected to a side of the nose piece, and dropped into a vertical hole formed in the nose piece along an inclined hole formed at a tip end of the pipe with a head part of the bolt being located on the topside. Thereafter, the punch which ejects air from a central hole is lowered within the vertical hole to drive the bolt into a metal plate while holding the bolt at a lower part of the vertical hole by the ejecting air flow.
B23P 19/06 - Screw or nut setting or loosening machines
B23P 19/00 - Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
F16B 37/06 - Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting
There is provided a caulking bolt which can be fastened by a general nut even when used to fix thin plates to each other, and which can also provide fitting strength similar to that of conventional products. The caulking bolt includes a head part 11 and a shaft part 12, and has a non-circular, flat, rotation preventive protrusion 14 formed on a seat surface 13 of the head part. Also, the upper end of a normal complete thread part 17 formed in the shaft part 12 is brought close to the seat surface 13 of the head part with a distance of 3 pitches or less, and an incomplete thread part 18 formed at the portion of 3 pitches or less is used as a stopper part into which a metal flows when the caulking bolt is driven into a metal plate.
A bolt for peeling a coating film of the present invention includes notch parts for peeling a coating film, the notch parts being formed over a plurality of pitches at top parts of screw threads in a male screw part formed in a shaft part. The bolt is characterized in that the respective notch parts formed over the plurality of pitches are arranged to be greatly inclined at an angle of 40° to 50° to an axial line of the shaft part. Since the respective notch parts can be rolled sequentially, it is possible to form the notch parts to be deeper and sharper than conventional ones and to enhance the coating film peeling performance. Also, the coating film peeled can be discharged efficiently as compared with conventional cases.
This paint film-peeling bolt is one in which paint film-peeling notches 6 are formed over multiple pitches on the thread crests of a male thread section 3 formed on a shaft section 2. The bolt is characterized in that the various notches 6 that are formed over multiple pitches are disposed with a large 40°-50° angle slant with respect to the axial line 12 of the shaft section 2. Since each notch can be sequentially formed by rolling, notches 6 that are deeper and sharper than in the past can be formed and paint film-peeling ability can be increased. The bolt is also capable of discharging the peeled paint film more efficiently than in the past.
F16B 25/04 - Screws that form threads in the body into which they are screwed, e.g. wood screws, self-tapping screws by a slicing and material displacing action, e.g. wood screws with sharp thread crests
F16B 25/02 - Screws that form threads in the body into which they are screwed, e.g. wood screws, self-tapping screws by a cutting and material removing action, e.g. fluted self-tapping screws
F16B 33/02 - Shape of thread; Special thread-forms
Provided is a case nut in which a nut that is held inside a case body so as to swing freely is not fixed as a result of electrodeposition coating treatment. The case nut is provided with a case body 2 that is welded to a body 1, and a nut 3 that is held inside said case body 2 so as to float freely. The nut 3 is provided with a metal nut body 4 and a resin insulating member 6 that is formed on the outside of said nut body 4 and prevents contact of the upper surface, lower surface and outer surfaces of the nut body 4 with the inner wall surfaces of the case body 2 and with the body 1.
Provided is a bolt which has high strength and excellent hydrogen embrittlement resistance characteristics. A bolt according to one embodiment of the present invention contains, in mass%, 0.32-0.39% of C, 0.15% or less of Si, 0.40-0.65% of Mn, 0.020% or less of P, 0.020% or less of S, 0.85-1.25% of Cr, 0.005-0.060% of Al, 0.010-0.050% of Ti, 0.0010-0.0030% of B, 0.0015-0.0080% of N, 0.0015% or less of O, 0-0.05% of Mo, 0-0.05% of V, 0-0.50% of Cu, 0-0.30% of Ni and 0-0.05% of Nb, with the balance made up of Fe and impurities. This bolt is configured to satisfy formula (1) and formula (2), and has a tensile strength of 1,000-1,300 MPa, while satisfying formula (3). 4.9 ≤ 10C + Si + 2Mn + Cr + 4Mo + 5V ≤ 6.1 (1) Mn/Cr ≤ 0.55 (2) (Solid-solved Cr)/Cr ≥ 0.70 (3)
This nut is an encased nut in which a nut (3) is held inside a case body (2), which is welded to a body (1), so as to be able to glide. The nut (3) is obtained from a hexagonal nut body (4) and a resin insulating member (5) that is insert-molded on the outer surface of said hexagonal nut body (4). On the side of the outer circumference that contacts the body (1), the insulating member (5) is provided with multiple protrusions (9). Since the nut (3) is insulated, the nut is not affixed as a result of electrodeposition coating.
A fastening tool according to the invention includes: a female screw member (10) having an inverse screw that is fixed to the first member (1); a collar bolt (11) that is screwed with the female screw member (10); a fastening bolt (27) that is inserted into a center hole (19) of the collar bolt (11) from the second member side (2) and rotates the collar bolt (11) through a torque transmitter (25), thereby moving the collar bolt to a position colliding with the second member (2); and a fastening nut (33) that is fixed to the first member (1). An earth claw (21) protruding toward the second member (2) is formed at an outer periphery of an end surface of the collar bolt (11) facing the second member. The earth claw (21) is configured to bite into the second member (2) in an axial direction due to axial force generated by screwing the fastening bolt (27) with the fastening nut (33), thereby breaking an insulating coating layer (3) and thus ensuring electrical conduction.
The bolt of the present invention can reliably peel coating even when fastened with a low torque, and can secure sufficient conductivity. A coating peeling part for peeling coating is formed at a tip end of an axis part in which a regular screw part is formed. The coating peeling part includes crushing parts having a trapezoidal top part and having a flank which is projected at a different angle with respect to the flank of the regular screw part; and a protruding part which is arranged adjacent to the crushing parts and whose top part projects beyond the outer diameter of the regular screw part.
A self-tapping screw for soft metals having low required initial driving torque, high axial force in the tightened state, small axial force reduction due to heat or the like, and a low manufacturing cost because no intricate and expensive mold is required, and also has an advantage that an amount of produced chip powder is small. The self-tapping screw includes a tapered smaller diameter part at an end of a shaft. The smaller diameter part is inserted and driven into a pilot hole formed in a soft metal to form a female screw in the pilot hole. In the shaft and the smaller diameter part, a continuous male screw with a constant pitch is formed. A thread ridge of the male screw of the smaller diameter part is provided with multiple sets of a largest diameter part and an increasing diameter part, the largest diameter part having a stepped part at a position on a trailing side of the largest diameter part during driven turning of the screw, the increasing diameter part having a gradually increasing diameter from the stepped part to a next largest diameter part.
Provided is a self-tapping screw for soft metals for which the initial screw-in torque is low, the axial force when fastened is high, reduction in axial force due to thermal effects, etc. is low, complex and expensive molds are unnecessary and the screw can be manufactured inexpensively, and the amount of chips generated is limited. The self-tapping screw is provided with a tapered reduced diameter section (3) on the tip of a shaft section (2) and forms a female thread in a pilot hole formed in a soft metal by being inserted and screwed into the pilot hole. Male threads of the same pitch are formed continuously on the shaft section (2) and the reduced diameter section (3). On the thread ridge (5) of the male thread of the reduced diameter section (3), multiple sets of a maximum diameter region (6), which has a step region (7) located towards the back when the screw is being screwed in, and a variable diameter region (8), the diameter of which gradually increases from said step region (7) toward the adjacent maximum diameter region (6), are formed.
A seal washer of the present invention includes a metal washer body including a center hole, an outer resilient material projecting from an outer periphery of the washer body to a location lower than a lower surface of the washer body, and an inner resilient material provided on an inner periphery of the washer body which faces the center hole. If a fastening force in an axial direction is applied, since the lower surface of the washer body metal-touches on a mating member, loosening does not occur unlike a conventional technique. In addition, since no further compression load is applied to the resilient material, a phenomenon that the resilient material is deformed in a crushed manner does not occur.
With this bolt, a coating can be reliably removed even if low-torque tightening is performed, and sufficient electrical conductivity can be ensured. On the tip of a shaft part (2) on which a normal screw section (1) is formed, a coating removal section (4) for removing a coating is formed. The coating removal section (4) has a pedestal shaped apex section, and is formed by the following: a flattened section (5) in which a flank portion thereof is caused to project at a different angle than the flank portion of the normal screw section (1); and a protrusion section (6) in which the apex section is caused to project more than the outer diameter of the normal screw section (1).
F16B 39/30 - Locking exclusively by special shape of the screw-thread
F16B 25/04 - Screws that form threads in the body into which they are screwed, e.g. wood screws, self-tapping screws by a slicing and material displacing action, e.g. wood screws with sharp thread crests
1)/2 is formed at a front end of a normal screw portion formed in a bolt shaft over one or more pitches, and a vertical groove for cutting out a foreign matter such as a spatter is formed in the incomplete screw portion. D in the above expression is a nominal diameter of the bolt.
F16B 25/00 - Screws that form threads in the body into which they are screwed, e.g. wood screws, self-tapping screws
F16B 35/04 - Screw-bolts; Stay bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
A pierce nut used for a high-strength steel plate according to the invention includes a female screw thread portion formed in the center of a nut body, an annular piercing portion projecting around the female thread portion, and an annular outer peripheral projection extending from the periphery of the nut body. The outer periphery of the piercing portion forms a first sloping surface increasing in diameter toward the leading end thereof, and also the inner peripheral surface of the outer peripheral projection forms a second sloping surface increasing in diameter toward the leading end thereof. Serrations are formed on the second sloping surface. Even where a mating member is a high-strength steel plate, the pierce nut according to the invention can ensure the same peeling strength and rotation torque as with a conventional nut, without deformation of the pierce nut itself.
This seal washer is configured in such a manner that an outer elastic material (17) is provided to the outer peripheral section of a metallic washer body (10), which is provided with a center hole (11), so as to protrude further downward than the lower surface of the washer body (10), and in such a manner that an inner elastic material (20) is provided to the inner peripheral section of the washer body (10), the inner peripheral section facing the center hole (11). When the washer body (10) is subjected to axial fastening force, the lower surface (15) of the washer body (10) comes into metal-to-metal contact with a counter-member, and consequently the seal washer does not loosen as is the case with conventional products. In addition, no additional compression load acts on the elastic material (17), and consequently the elastic material (17) is not squeezed and deformed.
Provided is a nut into which a bolt (10) including a male-threaded portion with a male-threaded external diameter d and a male-threaded core diameter d1 is screwed, wherein a bolt insertion side end of a female-threaded portion (21) formed in a nut body (20) is provided with an incompletely threaded female portion (22) that is formed by one to three pitches so that an internal diameter dimension D is larger than (d+d1)/2 and is smaller than the male-threaded external diameter d. Accordingly, even when the bolt is screwed into the nut in the inclination direction, the bolt may be rotated about a contact surface with respect to the incompletely threaded female portion (22), and hence seizing may be prevented.
F16B 33/02 - Shape of thread; Special thread-forms
F16B 35/04 - Screw-bolts; Stay bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
Provided is a nut having a seal washer, with which loosening does not occur, which has stable water-stopping functions, and which has excellent fastening properties. This nut having a seal washer has a seal washer (2) attached to the bearing surface side of a nut body (1). The seal washer (2) has a stepped-shape in which the lower surface (7) of an outer peripheral section is higher than the lower surface (8) of an inner peripheral section. The lower surface (8) of the inner peripheral section serves as a metal touch surface with another member during fastening, and an elastic seal material (10) which protrudes further downward than the lower surface (8) of the inner peripheral section is provided on the lower surface (7) of the outer peripheral section.
This pierce nut for a high-strength steel sheet is equipped with: an internally threaded part (11) formed in the center of the nut main body (10); a protruding circular piercing part (12) provided at the periphery of the internally threaded part; and a circular outer circumferential protrusion (13) provided at the outer circumference of the nut main body (10). The outer circumferential surface of the piercing part (12) forms a first inclined surface (15) the tip end of which has a larger diameter, and the inner circumferential surface of the outer circumferential protrusion (13) forms a second inclined surface (16) the tip end of which has a larger diameter, and serrations (17) are formed in this second inclined surface (16). As a result, when the counterpart member is a high-strength steel sheet, the same peeling strength and rotational torque as with a conventional nut can be maintained, without deformation of the nut itself.
The invention is directed to a method for caulking a caulking member such as a caulking nut or a caulking bolt to a metal plate. The metal plate is arranged on a die having a caulking protrusion formed on an end surface thereof, the caulking member is arranged on the metal plate while a position of a caulking recess portion of the caulking member is aligned with the caulking protrusion, and a punch is brought closer to the die so that the caulking member is pressed against the metal plate. While an upper surface of the metal plate in a position opposite to the caulking recess portion is restricted by a downward protruding portion of the punch or by the caulking member, the metal plate is plastically fluidized into the caulking recess portion, so that the caulking member is caulked without boring a hole in the metal plate.
Provided is an anti-seizing bolt capable of preventing seizing caused by the infiltration of sputter and other foreign material as well as seizing caused by oblique insertion. An incompletely threaded part (12), the outer diameter d of which is larger than the inner diameter D1 of female threads (20) and smaller than (D+D1)/2 (where D is the nominal diameter of the bolt), is formed across a pitch of one or greater at the tip of a regular threaded part (11), which is formed on a bolt shaft part. In addition, a vertical groove (14) is formed in this incompletely threaded part (12) to cut away sputter and other foreign material.
A nut capable of engaging with a bolt (10) having a male-threaded portion of external diameter d and core diameter d1, the nut having a structure in which an incompletely threaded female portion (22) having an internal diameter dimension D larger than (d+d1)/2 and smaller than d, is formed having a pitch of 1-3 on the end of the bolt insertion side of a female-threaded portion (21) formed on the nut body (20). Even when the bolt is screwed on at an angle, the structure allows the bolt to be rotated about the surface of contact with the incompletely threaded female portion (22), thereby avoiding seizing.
A method for fitting a fitting member, such as a fitting nut or fitting bolt, onto a metal plate (2). The metal plate (2) is positioned on a die (51) having a fitting protrusion (51b) formed on an end face thereof; a fitting member is positioned over this metal plate, such that the location of a fitting recess (1b) thereof coincides with the fitting protrusion (51b); and a punch (52) is brought into proximity with the die (51), thereby pressing the fitting member against the metal plate (2). While the upper surface of the metal plate (2) at a location in opposition to the fitting recess (1b) is constrained by a lower protruding part (52b) of the punch or by the fitting member, plastic flow is induced in the metal plate within the fitting recess (1b), thereby fitting the fitting member onto the metal plate without creating a hole.
The present invention relates to a structure for mounting an interior member in a railway car body. A fastening tool assembly (10) having a spacer (20) threaded into the inner sides of a nut member (12) is mounted on a mounting rail (52) of a railway car body, and an interior member (55) is set in place. In this state, the spacer (20) is rotated to adjust the amount of protrusion from the fastening tool assembly (10), and the spacer (20) is brought in contact with the interior member (55). The interior member (55) is then mounted on the mounting rail (52) by a fastening bolt (30).
This invention relates to a cap nut for an insert, the cap nut having excellent productivity and low production cost. Provided is an insert cap nut in which an internal thread (3) is formed in a through-hole (2) provided to the center of a nut body (1), and a lid (5) is fitted into an annular recess (4) provided to the upper end surface of the nut body (1); the insert cap nut having a structure in which the lid (5) is integrally bonded to the nut body (1) by an inwardly protruding inner burr portion (7a) formed by pressing a vertical wall (6) on the peripheral edge of the recess (4) from above and crimping the vertical wall into a plurality of groove shapes.
1)/2. When the bolt is obliquely screwed into the female screw, the small-diameter thread part is brought into contact with the female screw at one point, but the bolt is allowed to rotate around the point. Thus, the occurrence of cross-threading is prevented.
Disclosed is a female screw component and a fastening component utilizing same which can prevent seizing resulting from skewed insertion and ensures smooth fastening regardless of the direction from which a bolt is inserted. The female screw component has a threadless section (14) of at least one pitch from the bolt insertion face (11) on the inner surface of a female screw component body (10) provided with female thread (13), and also has a protrusion (15) formed above a line extended from the helical female thread which contacts the flank surface of the male thread (21) of an inserted male bolt (20). The female screw component is used in combination with the male bolt (20), which does not have any incomplete screw sections, and no matter what direction the bolt is inserted from, seizing does not arise. Furthermore, it is yet more preferable for the location of the starting end of the female threads (13) of the female screw component body (10) to be staggered from the location of the starting end of the protrusion (15) in the circumferential direction.
To provide an anti cross-thread bolt which prevents itself from being cross-threaded without the need for correcting its posture by a pilot portion. The bolt is screwed into a female screw having a nominal diameter D and an inner diameter D1. At the tip of a regular thread part 11 formed on a bolt shank, a small-diameter thread part 12 is formed by one pitch or more, the small-diameter thread part having an outer diameter d which is larger than an inner diameter D1 of the female screw and smaller than (D+D1)/2. When the bolt is obliquely screwed into the female screw, the diameter thread part 12 is brought into contact with the female screw at one point, but the bolt is allowed to rotate around the point. Thus, the occurrence of cross-threading is prevented.
F16B 35/04 - Screw-bolts; Stay bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
06 - Common metals and ores; objects made of metal
Goods & Services
Bolts; common metals and their alloys; metal building materials; transportable buildings of metal; materials of metal for railway tracks; non-electric cables and wires of common metal; ironmongery, small items of metal hardware; pipes and tubes of metal; safes; goods of common metal not included in other classes; ores.
A fastening device for tightening a first member (Pl) and a second member (P2) spaced from each other while keeping them spaced at their mutual distance is provided. The fastening device includes: a nut (5) fixed to the first member (Pl); a holder (4) fixed to the first member (Pl); an adjuster nut (3) incorporated within the holder (4) to be unrotatable but movable in an axial direction; a bolt (1) inserted from the second member (P2) toward the first member (Pl); and a collar bolt (2) temporarily screwed to a male screw portion (12) of the bolt (1) via torque-transmitting means.
A hook attaching unit in accordance with the invention is constituted by a hook member which is rotatably attached to an end portion of a base plate, a bolt with a flange inserted to a bolt insertion hole of the base plate, and a resin cover member in which a cover body is connected to an annular basement portion. Since the hook member, the cover member and the bolt are integrally assembled, it is not necessary to install the bolt separately in the work field and then install the cover member after attaching the hook, and as such, the workability at the time of fastening is improved. Further, since the cover member invisibly covers the bolt head portion, improved safety and outer appearance is obtained. The hook attaching unit can be also utilized for attaching a seat belt anchor plate.
A bolt, wherein a small diameter guide (116) is formed at the terminal tip part of a shaft part (15) and threads (31) oppositely threaded to threads (30) formed in a fixed diameter part (115) are formed in the guide part. When the bolt (1) is inserted into a nut (100) in a tilted state and the threads (31) are engaged with the female screw part (105) of the nut (100), an effect to raise the bolt (1) occurs in the nut and, therefore, unless the bolt is positioned in a correct tightening attitude, it cannot be threaded into the nut (10). Accordingly, the bolt (1) can be securely prevented from being caught or seized into the nut (100). When the threads (31) are formed in an oppositely threaded double threaded screw, the effect can be further increased.
A fixing tool for fixing an object to be fixed against an opponent member upon pinioning includes a male screw member screwed into a female screw portion formed on the opponent member side and a pinion member for pinioning the object to be fixed in the opponent direction. The male screw member includes a first axis portion formed with a male screw and a head portion having a non-circular contour formed at an upper end of the first axis portion. The pinion member includes a through hole into which the first axis portion of the male screw portion is inserted, seat portions that are formed inside of the through hole at which the head portion of the male screw member is seated, and engaging portions that pinch the head portion between the seat portions for engaging the head portion in a detachable manner.
