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AssigneeRobert Bosch GmbH
InventorsAlfred Odendahl, Horst Sigg, Heinz Neubert, Hans-Peter Meyen
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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).
A device for transferring torque to a tool in a hand tool apparatus, said device comprising a tool member (12) having a tool shaft (11) provided with a plurality of catch grooves (23) and provided with at least one elongated locking groove (25) circumferentially displaced from the catch grooves (23) in the tool shaft (11), said catch grooves (23) being open at a tool shaft end received in the hand tool apparatus;
Tool member (12) for a hand tool apparatus, said tool member (12) having a tool shaft (11) provided with a plurality of catch grooves (23) in the tool shaft (11) and provided with at least one elongated locking groove (25) spaced circumferentially from the catch grooves (23) in the tool shaft (11), said catch grooves (23) being open at a tool shaft end received in the hand tool apparatus, wherein the at least one locking groove (25) of the tool shaft (11) has a depth (d) increasing in an axial direction from a rear end of the tool shaft (11) held in the hand tool apparatus to a front end of the tool shaft (11) and said at least one locking groove (25) is provided with at least one axially extending side surface (27) thereof as part of additional means for transferring torque to the tool member from the hand tool apparatus.
Tool holder (10) for a hand tool apparatus, said tool holder (10) having a tool receptacle (16) provided with a receptacle cavity (17) in which a tool member (12) having a tool shaft (11) is held in operation, wherein the tool receptacle (16) has at least two axially extending, catch elements (24) projecting inward into the receptacle cavity (17) so as to be engageable with catch grooves (23) provided in the tool shaft (11) and at least one lock element (19) guided in a radial recess (18) provided in the tool receptacle (16) in a circumferential region of the receptacle cavity (17) spaced circumferentially from the catch elements (24) so as to be movable radially outward against a spring force, wherein said at least one lock element (19) is engageable in at least one locking groove provided in the tool shaft (11), the at least one lock element (19) is shaped to limit axial motion of the tool member (12) when the at least one lock element (19) is engaged in the at least one locking groove and the at least one lock element (19) is provided with longitudinal sides having opposing axially extending planar side surfaces (28) in a region of the at least one lock element (19) protruding inwardly in the tool receptacle (16) and engaging on axially extending planar sides surfaces (27) provided in said locking grooves (25) to provide additional torque transmission to the tool member.
Dependencies are inferred from the claim text.