An exhaust muffler (23) has an exhaust inlet (24), an exhaust outlet (25), as well as a catalytic converter (26) which in the flow direction (40) is disposed between the exhaust inlet (24) and the exhaust outlet (25). The catalytic converter (26) has at least one throughflow body (31) which comprises at least one wire body (34, 35). At least one first component region (32) of the throughflow body (31) is coated with a catalytic-effect coating. The throughflow body (31) moreover has a second component region (33) which in terms of volume has a smaller quantity of catalytic-effect coating than the first component region (32).
F01N 3/24 - Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
F01N 13/00 - Exhaust or silencing apparatus characterised by constructional features
A handheld work apparatus has a drive motor which drives a work tool and a generator. The work apparatus has a first electrical load and a connectable second electrical load. The generator provides the electrical power for the simultaneous operation of the two loads. The work apparatus has a control unit for controlling the power supplied to the first electrical load. In order to supply approximately the same power independent of voltage fluctuations, a voltage monitoring circuit is provided which, in a first operating state, sets a first signal sequence for operating the first load and, in a second operating state, sets a different second signal sequence for operating the first load. The mean power of the first signal sequence and that of the other second signal sequence are approximately equal.
F02M 15/04 - Carburettors with heating, cooling or thermal insulating means for combustion-air, fuel or fuel-air mixture with heating means, e.g. to combat ice-formation the means being electrical
In an arrangement of a power tool and a carrying system, the carrying system has a support strap and a releasable fastening device for attaching the power tool to the support strap. The carrying system has an actuating device that actuates the releasable fastening device from a fastening position into a release position. The fastening device has a pivotable hook that in the fastening position is hooked to an eye and secures the power tool on the carrying system. When the carrying system is arranged on a user and the power tool is secured on the carrying system and the fastening device is actuated from the fastening position into the release position, the hook is pivoted such that the eye slides out of the hook because of the weight of the power tool.
A01D 34/90 - Mowers; Mowing apparatus of harvesters specially adapted for particular purposes for carrying by the operator
A01G 3/06 - Hand-held edge trimmers or shears for lawns
A45F 5/00 - Holders or carriers for hand articles; Holders or carriers for use while travelling or camping
B25F 5/00 - COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR - Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
4.
HANDHELD WORK APPARATUS HAVING A CONTROL UNIT FOR AN ELECTRIC HEATING ELEMENT
The invention relates to a handheld work apparatus such as a chain saw having at least one combustion engine for driving a work tool. For the operation of the combustion engine, an air/fuel mixture is supplied to the latter via a carburetor,which has an electrical heating element for heating to a given temperature. In order to achieve an exact temperature control, an ohmic resistance value of the heating element in dependence on temperature is stored in a memory. A current flowing through the heating element and a voltage drop at the heating element are measured and used to calculate a current resistance of the heating element. The current ohmic resistance value is compared to the value stored in the memory in order to turn off the heating element in dependence on the result of the comparison. Advantageously, no temperature sensor is needed.
F02B 63/02 - Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
G05D 23/19 - Control of temperature characterised by the use of electric means
A hand-held power tool has a drive motor driving a tool and a generator. One or more heating devices having one or more heating elements are provided. The generator supplies the one or more heating devices with energy. A control device controls a power supplied to the one or more heating elements as a function of at least one operating parameter of the drive motor.
B25F 5/00 - COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR - Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
F01B 31/02 - De-icing means for engines having icing phenomena
F02B 63/00 - Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
F02M 1/00 - Carburettors with means for facilitating engine's starting or its idling below operational temperatures
F02M 15/04 - Carburettors with heating, cooling or thermal insulating means for combustion-air, fuel or fuel-air mixture with heating means, e.g. to combat ice-formation the means being electrical
A device for supplying water to a cutting wheel of a hand-held cut-off machine has a water-conducting line and a valve arrangement arranged in the line. The valve arrangement has a shut-off valve for controlling the water flow flowing through the line. The shut-off valve is actuated as a function of an operating signal of the cut-off machine such that in operation of the cut-off machine the water flow through the line is released by the shut-off valve. The shut-off valve interrupts the water flow through the line when the operating signal is absent.
A protective cover for a cutting wheel of a hand-held cut-off machine driven by an internal combustion engine has a circumferential wall and two opposed sidewalls adjoining the circumferential wall. The circumferential wall and the two sidewalls are a monolithic component made of cast light metal. The circumferential wall in a circumferential direction has at least over sections thereof a first integral thicker portion. The two sidewalls are thinner than the first integral thicker portion. Preferably, the protective cover is made of diecast magnesium.
A protective shield for a trimmer having a cutting head that is rotatable about an axis of rotation and supports a cutting thread that rotates about an axis of rotation with the cutting head and determines a cutting circle, covers at least partially the cutting circle. The protective cover has a base member and a cutting-to-length blade arranged on the base member so as to be positioned circumferentially relative to a cutting circle of the rotating cutting thread. The cutting-to- length blade has a cutting edge that, relative to the axis of rotation of the rotating cutting thread, is arranged in an axially displaced position displaced in an axial direction relative to the cutting circle. A device for axially deflecting the rotating cutting thread out of the cutting circle to the cutting edge is provided.
A carburetor arrangement of a portable handheld work apparatus includes a carburetor which is fixed to a motor housing of the work apparatus by elastic support elements. A warm air channel is provided for conducting warmed air to the carburetor. At least one part of the warm air channel runs through at least one support element.
F02M 15/02 - Carburettors with heating, cooling or thermal insulating means for combustion-air, fuel or fuel-air mixture with heating means, e.g. to combat ice-formation
The invention relates to a manually operated tool, in particular a parting-off grinder (1) or similar device. The tool has a bracket (7) which has a first end (15) which is fixed to the housing (6) of the tool and a second end (16) to which is fixed a spindle (8) which drives a metal cutting tool. The spindle (8) is driven by a drive wheel (11) via a belt drive. A bracket of high rigidity at low overall weight can be achieved if the bracket (7) is designed as one piece and can be fixed to the housing (6) in at least two positions.
A manually operated tool such as a chainsaw, parting-off grinder or similar device has an internal combustion engine (15) to drive a tool (2), an air cleaning unit and a tank housing (10). The tank housing (10) is a cast part and a fuel tank (12) is located in the tank housing (10). A simple, advantageous design of the tank housing (10) is achieved when at least one housing part (19, 21) of the air cleaning unit is formed to the tank housing
B24B 27/08 - Grinders for cutting-off being portable
B23D 53/12 - Hand-held or hand-operated sawing devices working with strap saw blades
F02B 63/02 - Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
A manually operated tool such as a parting-off grinder (1), chainsaw or similar device has a tank housing (10) which contains a fuel tank (12). The tool has an air cleaning unit, the tank housing (10) being connected to the clean air side (44) of the air cleaning unit via a bleed device. A simple design in which leaks are avoided results if a reservoir wall (63) of the tank housing (10) and a housing wall of the air cleaning unit are positioned adjacent to one another and the bleed device comprises a bleed opening (43) which passes through the reservoir wall (63) and the housing wall.
F02M 25/00 - Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
F01N 13/00 - Exhaust or silencing apparatus characterised by constructional features
B23D 47/00 - Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts
B24B 23/02 - Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
B24B 27/08 - Grinders for cutting-off being portable
B26D 7/00 - CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING - Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
F02B 63/02 - Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
F02B 77/00 - Component parts, details, or accessories, not otherwise provided for
F02M 17/04 - Floatless carburettors having fuel inlet valve controlled by diaphragm
F02M 17/50 - Carburettors having means for combating ice-formation
F02M 25/08 - Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
F02M 37/00 - Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
A guide cart for a tool such as a parting-off grinder or similar device has a frame (4) on which are positioned at least three wheels (5, 6). In order to achieve the easy adjustment of the cutting depth of a tool positioned on the guide cart at least one wheel (6) is fixed by a first strut (10) and by a second strut (11) to the frame (4) of the guide cart (1). In this arrangement the first strut (10) is mounted on the frame (4) in such a manner that it is able to rotate and at least two mounting points (12, 13) spaced a certain distance apart are provided for mounting the second strut (11).
B24B 27/08 - Grinders for cutting-off being portable
B24B 19/02 - Single purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements
B24B 23/02 - Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
B28D 1/04 - Working stone or stone-like materials, e.g. brick, concrete, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular saw blades or saw discs
patents
