Black Decker Inc.

Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Metabowerke Gmbh

Reinhard Plietsch

Stefan D Gensmann

Andreas Hanke

Heinz-Werner Faatz

Reimund Becht

Bruno Meinholf Ruethers

Robert Bernhard Wache

Bernd Wiesner

Helge-Björn Kuntze

Christian W Frey

Andreas Jacubasch

Marco Gaertner

Patrick Neika

Stefan Schwarz

Christan Frey

An electrical hand tool device () comprises a control electronics () and a transmitter and receiver () which is responsive in a wireless and contact-free fashion, and with a storage medium () in which an authorization code is stored, wherein an operation locking state and an operation release state can be differentiated, and with an external transmitter and receiver means () which is accommodated in a separate portable device (), wherein communication with the transmitter and receiver means () of the electrical hand tool device can be produced in a defined fashion through actuation of the external transmitter and receiver means () to change the operation state, and communication is provided only to change the operation state and optionally to change the authorization code.

Electrical hand tool device

Disclosed is an optimizing method for regulating the operating state of a guided machine tool having a tool rotating at a certain speed and subjected to a percussion frequency during a boring action, in which the tool, subjected in addition to a force, is driven into an object of a given material. The method includes, determination of the parameters characterizing the actual operating state of the machine tool; conduction of an adaptive process analysis based on the determined parameters in order to obtain parameter-specific, relevant characteristics; evaluation of the parameter-specific, relevant characteristics within the framework of a logical decision-making process in order to obtain information characterizing the actual operating state; selection of known reference data of the utilized tool describing the operating state and of the to-be-machined material according to a given quality criterion; determination of an optimum operating point for the machine tool determinable by the rotational speed and percussion frequency by comparison of the information characterizing the actual operating state with the selected reference data; and regulation of the machine tool regarding the rotational speed and percussion frequency based on the determined optimum operating point.

Optimizing method for regulating the operating state of a guided machine tool comprising a rotating percussion tool during a boring process

A hand held electrically powered hammer comprises a housing, a motor, and a hollow spindle. A piston and a ram are located for reciprocation within the spindle. A casing encloses at least part of the spindle so as to define a chamber between the spindle and the casing. A damping mass is slideably supported by a spacer and is located within the chamber and is connected to the hammer housing via a spring so as to oscillate back and forth along the spindle to minimize the vibration of the hammer housing and also so as to generate air flows within the chamber for facilitating heat transfer from the spindle to the metal casing.

Hammer

A motor driven hammer comprising a tool holder and an air cushion hammering mechanism including a piston and a beat piece slideably located in a cylinder wherein reciprocation of the piston in the cylinder will cause the beat piece to hit a tool located in the tool holder, and further comprising an eccentric mass mounted for rotation about the axis of the cylinder and rotatingly driven by the motor via a gear arrangement so as to cause the bit mounted in the tool holder to be laterally diverted.

A rotary hammer is provided which comprises a tool holder (,) and an air cushion hammering mechanism which comprises a cylinder (,&prime;) having one end (,) that is connected to the tool holder, a piston (,), a ram (,) and a beat piece (,) slidably located in the cylinder so that reciprocation of the piston in the cylinder will cause the ram to reciprocate in the cylinder and thus cause the beat piece to hit a bit located in the tool holder. The ram (,) has an annular recess (,) in its peripheral surface at the end thereof nearest the piston (,), in which recess is located an annular seal (,). The annular seal has an annular seating flap (,) lying on the radially outwardly directed surface of the recess and an annular sealing flap (,) that is joined to the seating flap and extends between the radially outwardly directed surface of the recess and the inner wall of the cylinder (,&prime;).

Rotary hammer

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Brechen, Germany

Reinhard Plietsch