Robert Boschgmbh

Klaus Klingenstein

Werner Rieker

Joachim Schadow

Fritz Schadlich

Manfred Kirn

Gunter Schaal

David Matzo

Ernst Kraenzler

Ernst Dreher

Joerg Dehde

Joerg Moessner

Gerd Hahn

Christian Hermes

Joerg Ullrich

Karl Garatwa

Rainer Thaler

Manual machine tool with tool holder and appropriate tool

A hand machine tool for clockwise and counterclockwise rotation includes a universal electric motor and a reversing switch. The reversing switch is comprised of a contact plate and a contact holder both provided with coupling elements for coupling the contact plate and the contact holder for limited relative rotation. The coupling elements of the contact plate and the contact holder enclose a dust-sealed chamber in which contacts are accommodated.

Hand tool for clockwise and counterclockwise rotations

To prevent bounce of a hammer or plunger element coupled to an insertion blade of a stapling or nailing gun upon return of the plunger element to rest position by a spring (11), the plunger element (4) is in cup shape, sliding about a hollow cylinder (6) which is vented to ambient air (8) at one end, but closed at its other end by a flap-type check valve (9). Upon downward movement of the plunger element, for example under electromagnetic force of a solenoid (2), air can flow freely from the vent opening (8) into the hollow interior and through the then open check valve (9); upon return movement under force of a spring (11), the flap valve (9) will close, however, thus forming an air cushion or air damper and preventing rapid, uncontrolled return of the plunger element to rest position, due to an air throttling path (19) between the outside of the hollow cylinder and the inner surface of the plunger element (4), said air throttling path being defined by the operating clearance between the plunger (4) and the hollow cylinder (6). The hollow cylinder (6) may be constructed as a guide element, unitary with the valve, and made of plastic, the valve being secured by a living hinge to the remainder of the hollow cylinder.

Electric hammering apparatus with air-cushioned armature

Growing community of inventors

Leinfelden-Echterdingen, Germany

Klaus Klingenstein