Robert Boschgmbh

Heinz Neubert

Horst Wierspecker

Hans-Peter Meyen

Alfred Odendahl

Horst Sigg

Device for coupling a tool to a hand-held tool-driving device

Device for coupling a tool to hand-held tool-driving machine

The device for transferring torque to a tool member in a hand tool apparatus includes a plurality of catch grooves (23) and at least one elongated locking groove (25) spaced circumferentially from the catch grooves (23) provided in the tool shaft (11) of the tool member (12); a tool holder (10) having a tool receptacle (16) provided with a receptacle cavity (17) for the tool member (12) and having at least two axially extending catch elements (24) projecting inwardly into the receptacle cavity (17) so as to be engageable with the catch grooves (25) and at least one lock element (19) guided in a radial recess (18) provided in the tool receptacle (16) spaced circumferentially from the catch elements (24) so as to be radially movable outwardly against a spring force and engageable in the at least one locking groove (25) so as to limit axial motion of the tool member (12). To strengthen the torque transfer device for transferring torque to the tool member the at least one locking groove (25) in the tool shaft (11) includes a front portion (34) and a rear portion (33) and the front portion is deeper than the rear portion so that in a working position of the tool member (12) the at least one lock element (19) is located in the front portion of the at least one locking groove (25) and protrudes more deeply into the tool shaft (11) than in an idle position of the tool member (12) in which the at least one lock element (19) is located in the rear portion of the at least one locking groove (25).

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Ebersbach, Germany

Heinz Neubert