초록 ▼

A drill chuck can be driven by and rotated with a drill spindle. The drill chuck has an axial passage through which the impact effort of a central anvil shaft can be transferred to the drill. The drill can be held in chuck jaws, the movement of which can be controlled by a control sleeve. For connec

A drill chuck can be driven by and rotated with a drill spindle. The drill chuck has an axial passage through which the impact effort of a central anvil shaft can be transferred to the drill. The drill can be held in chuck jaws, the movement of which can be controlled by a control sleeve. For connecting the drill chuck at the drill spindle in such a way that they rotate together, there is provided a coupling element and this can allow an axial displacement of the drill chuck at the drill spindle. This mode can be turned off, or on, by use of a locking mechanism and with a coupling ring. The lock mechanism includes a lock element which is axially fixed with respect to the drill spindle, which can be actuated by the coupling ring. The coupling ring can be axially shifted but it can be fixed so as not to rotate. The lock element can be moved into respective recesses arranged circumferentially at the chuck body for precluding axial displacement of the chuck body. The coupling ring has teeth which can engage in matching teeth of the control ring.

대표청구항 ▼

A percussion drill comprising: a rotatable percussion drill spindle; a drive rod axially guided in said spindle for imparting percussion action to a drill bit; a drill chuck adapted to receive said bit and mounted on said spindle for rotation therewith, said chuck having a body with an axially direc

A percussion drill comprising: a rotatable percussion drill spindle; a drive rod axially guided in said spindle for imparting percussion action to a drill bit; a drill chuck adapted to receive said bit and mounted on said spindle for rotation therewith, said chuck having a body with an axially directed passage traversed by said rod for transferring the action of said drive rod to the bit, said chuck body being formed with circumferentially disposed recesses, and jaws on said body for holding said bit; at least one coupling element for rotationally connecting said drill chuck to said drill spindle and enabling axial play of said chuck on said spindle; a control ring for actuating said jaws, said control ring having teeth formed in one face thereof; and a locking mechanism including a coupling ring and at least one lock element fixed with respect to said drill spindle, but being actuatable by said coupling ring, and being adapted to be moved into a respective one of said circumferential recesses of said chuck body for precluding axial displacement of said chuck body on said spindle, said coupling ring being mounted for displacement in axial direction, but securable against rotation, said coupling ring, at its rim which is directed towards said control ring, having a plurality of teeth which on axially positioning of the coupling ring towards the drill end of the chuck can operatively engage in the teeth of said control ring.