Robert Boschgmbh

Helmut Heinzelmann

Dietmar Saur

Tobias Herr

Andre Ullrich

Michael Weiss

Otto Baumann

Hardy Schmid

Juergen Lennartz

Achim Duesselberg

Thomas Bernhardt

Juergen Veit

A drill hammer for the three operation modes of drilling, chiseling, and hammer-drilling has a motor with a motor shaft; a gear with an intermediate shaft, a driving gear wheel, a toothed slaving shaft , a shifting hub, and a driven gear wheel; a percussion mechanism with a wobble disk and a wobble gear wheel; and a driven shaft with a driving gear wheel and a drill chuck. The gear is configured to be changed over easily without axial displacement of running gears that mesh with one another so that the drill hammer is more robust, shorter or more compact, and lighter in weight. The drill hammer is thus simply and economically constructed and whose efficiency is not impaired by the gear shifting mechanism.

Drill hammer with three modes of operation

The invention relates to a hand-held power tool, in particular a hammer drill which has a hammer drive, a rotary drive, a switching device, and a main output element. The switching device has a slide mechanism, which is designed for switching between different operating modes. According to the invention, the slide mechanism has at least one coupling element, which in at least one operating mode is directly coupled to a coupling element, the latter being rotationally fixed to the main output element.

Hand-held power tool

A hand-held drill hammer has a housing, a shaft () connected to a drive shaft (), and a lifting bearing (). The lifting bearing () is supported and the shaft () for converting rotary motion into a reciprocating motion. In a first switching configuration, a percussion drive connection exists between the shaft () and the lifting bearing (). In a second switching configuration, the percussion drive connection is interrupted. The lifting bearing () may be fixed with respect to a reference system of the housing in the second switching configuration.

Hand-held tool comprising a shaft and a lifting bearing which is mounted on the shaft

A detent disk for an overload coupling part has a detent disk body configured as a powder-metallurgy produced disk body, the detent disk body has a substantially uniform wall thickness and an inner circumference, and at least one driving device for driving in a rotary manner is provided on the inner circumference and configured as a driving pocket.

Snap-in disk and overload clutch with a snap-in disk

An electric power tool has a drive mechanism switchable back and forth among a drilling, a percusion drilling, and a chiseling mode of operation; a drive shaft performing a rotary motion; a percusion mechanism provided with a drive bearing; a serrated sleeve supported axially displaceably in the drive bearing of the percussion mechanism and transmitting a rotary motion of the drive shaft to the drive bearing of the percusion mechanism when it is in an axial position corresponding to the chiseling or percusion drilling modes of operation; and an axially displaceable serrated shaft supported in the drive bearing, so that the serrated sleeve transmits to the serrated shaft the rotary motion of the drive shaft when the serrated shaft is in axial position corresponding to the drilling or percussion drilling modes of operation.

Electric power tool having a drive mechanism that can be switched among drilling, percussion drilling, and chiseling modes of operation

The tool mount has a body () with means for housing a tool with grooves, whereby the body () is equipped with a damping mechanism () with which the tool can be clamped in position in the body (), and an operating element () for unclamping the tool is provided. A wear-resistant tool mount requiring low production expenses has a housing sleeve () for the tool. The housing sleeve is inserted in the body () and is made of a harder material than the body ().

Growing community of inventors

Stuttgart, Germany

Helmut Heinzelmann