Hilti Aktiengesellschaft

Peter Hellmann

Claus Osselmann

Hans-Werner Bongers-Ambrosius

Erwin Manschitz

Roland Schaer

Ferdinand Kristen

Martin Mayr

Stefan Groer

Lutz Troeder

Michael Reiner

Guido Werdun

Guido Werdün

The object of the invention is a device, intended for a multifunctional, hand-held tool machine, for example, an electric combination hammer, for the ON/OFF switching or changeover of individual system functions when changing the processing mode, for example, from 'hammer drilling' to 'chiseling'. Pursuant to the invention, the changeover device, which is to be actuated by the user, is coupled with a mechanical driving mechanism, by which a bistable switch, comprising two mutually oppositely movable elements, is actuated. In a combination hammer, the invention guarantees that, when the chiseling operation is selected, certain functions of the system, such as a monitoring of the reaction moment, are interrupted or changed over.

Switching device for multifunctional hand-held machine tool

A multifunction handheld tool machine having an at least partially axially percussive tool receptacle (), a safety coupling () disposed in the power line between the tool receptacle and an electrical motor (), a hand-guided housing and an ATC safety module () with a rotational sensor () sensitive to an angular displacement. The ATC safety module () is connected to an axial displacement sensor () and, in the event of exceeding an axial limit value (), the binary control signal () is suppressed by the axial displacement.

Safety module for a multifunctional handheld tool

A process and a circuit ( ) for regulating the speed of an electric motor ( ) having a high speed (N ) to at least one additional lower speed (N , N , N ), whereby, in a first prioritized step, depending on a preselected speed (N , N ), the regulation of the speed to a lower effective motor voltage (Ueff) has an upper limit, and in a second step, depending on the torque (M) needed for the regulation to this preselected speed (N , N ), the effective motor voltage (Ueff) is regulated within the limited range.

Circuit and process for regulating the speed of universal electric motors

An electrical hand-tool device and start-up safety routine protecting against start-up blockages, in which an electrical motor is connected, for a short time span (T ), with the current supply at a determinable resistance. At least one of a limit value (&agr; ) and a shut-off point in time (t ) is determined, for the safety routine in the event of tool blockage, using a measurement of the angle of rotation (&phgr;) of the rotor taken over the time span (T ) dependent on the start-up behavior of a rotor in the time span (T ).

Rotary electrical hand-tool device and startup safety routine

A safety clutch for an electric hand-held tool and including a rotor ( ), an anchor disc ( ) frictionally engageable with the rotor ( ) for transmitting a torque there-between, a stationary axial stop ( ) for limiting the air gap (s) between the rotor and the anchor disc and engageable by the anchor disc under an axial reserved pre-stress applied to the anchor disc (g); and a stationary electromagnetic coil ( ) provided on a side of the rotor ( ) remote from the anchor disc ( ) and coaxial with the rotor ( ) for generating a rotationally symmetrical magnetic flux (&phgr;) for attracting of the anchor disc (g) to magnetic poles ( ) associated with the rotor ( ).

Safety clutch for electrical hand-held tool

A method of and an apparatus for preventing accidents caused by blockage of a rotatable tool when working with a hand-held tool including the rotatable tool (8), a drive motor (7) for driving the rotatable tool (8), and means (5, 6) for interrupting transmission of a drive torque from the drive motor (7) to the rotatable tool (8) dependent on an operational condition of the hand-held tool, with the method including determining the operational condition of the hand-held tool by measuring displacement of the hand-held tool in space in at least two points of the hand-held tool spatially spaced from each other and spaced from a tool axis; subtracting two obtained displacement measurement variable (a.sub.1, a.sub.2) from each other; and thereafter, calculating an actuation signal that actuates the interrupting means (5, 6); and with the apparatus including sensors and an evaluation circuit for implementing the method.

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Obermeitingen, Germany

Peter Hellmann