Automatically locking chuck for drill or the like
AssigneeRobert Bosch GmbH
InventorsWilbert Reibetanz, Karl Wanner, Otto Baumann, Rolf Muller
Life of this patent
Estimating the term…
Abstract
A chuck for use in a percussion drill or the like has a unit for securing the chuck jaws against unintentional loosening during operation. The securing unit moves from an unlocked position in which a tool can be received by the chuck jaws to a locked position automatically for drilling operations without the use of a key. The securing unit includes a first surface (22) upon which a sliding member (21) is slidable to be received in a recess (26) during the shaking caused by drilling, so that coupling members (15, 19) between a securing sleeve (17) and a clamping sleeve (13) engage with one another.
Claims15
A chuck for a drill or the like, comprising:
- a body (3) having a plurality of jaws (6);
- means (8) for adjusting said plurality of jaws relative to one another to receive a tool;
- and
- means (17) for securing said adjusting means (8), said securing means being movable from an unlocked position in which said jaws can be opened and said tool can be received by said jaws, to a locked position in which said jaws are clamped, automatically during operation of said drill due to shaking of the chuck.
A chuck for a drill or the like, comprising:
- a body (3) having a plurality of jaws (6);
- means (8) for adjusting said plurality of jaws relative to one another to receive a tool;
- and
- means (17) for securing said adjusting means (8), said securing means being movable from an unlocked position in which said jaws can be opened and said tool can be received by said jaws, to a locked position in which said jaws are clamped automatically during operation of said drill due to shaking of the chuck, said securing means (17) including a sliding member (21) formed as a projection, a first surface (22) facing said member (21) and a second surface (23) also facing said member (21), said first and second surfaces being slidable against one another, said first surface (22) being substantially parallel to an inclined with respect to a plane positioned radially with respect to the axis of said securing means.
The chuck according to clam 6, wherein said first surface (22) is positioned at one side of said recess (26) and said second surface (28) is positioned at another side of said recess (26).
The chuck according to clam 6, further including means (13) for clamping said tool in said plurality of jaws (6), said clamping means being connected to said adjusting means and said first surface (22) being positioned in a direction of rotation of said recess (26) such that said clamping means (13) can be rotated for closing said chuck (2).
A hand machine tool employed for percussion drilling, the hand machine tool comprising a machine tool part;
- and a keyless drill chuck for holding a tool and including a body 3 having a plurality of jaws (6), means (8) for adjusting said plurality of jaws relative to one another to receive said tool, and means (17) for securing said adjusting means (8), said securing means being movable from an unlocked position said jaws can be opened and, and in which said tool can be received by said jaws, to a locked position in which said jaws are clamped, automatically during operation of said drill due to shaking of the chuck.
Dependencies are inferred from the claim text.