Patent ID: 7726917

Claim:
A drill comprising: a drive unit having an output drive spindle having a threaded outer end of a predetermined small diameter and centered on and rotatable about an axis; a chuck body having a forwardly open large-diameter threaded bore centered on the axis, a rearwardly open bore also centered on the axis and of the small diameter, and an annular array of radially outwardly projecting teeth centered on the axis, the spindle end being threaded into the small-diameter bore and projecting axially forward into the large-diameter bore; a sleeve assembly formed by an outer adjustment sleeve extending generally a full axial length of the chuck body and an inner ring riding on the chuck body and at least limitedly rotatable relative to the outer sleeve, the sleeve assembly being axially fixed but rotatable on the chuck body and formed centered on the axis with a plurality of axially extending, angularly spaced, and forwardly open angled guides; respective jaws slidable along the guides; a latching pawl pivotal on the inner ring between a latching position engaging the teeth and preventing rotation of the sleeve relative to the chuck body in a loosening direction and a freeing position permitting such rotation; a spring urging the latching pawl into the latching position; a pair of pins set in the inner ring and a pair of angularly offset and angularly confronting faces formed in the outer sleeve and engageable with the pins, the faces being angularly more widely spaced than the pins, the pins and faces defining for the outer sleeve a pair of angularly offset end positions relative to the inner ring; means including a cam on the outer sleeve and engageable with the pawl for holding the pawl in the freeing position in one of the end positions of the outer sleeve; and a coupling body having a large-diameter rear end threaded into the forwardly open large-diameter bore of the chuck body and a front end fitted to and angularly coupled to the jaws, whereby rotation of the sleeve assembly, jaws, and coupling body relative to the chuck body axially shifts the coupling body in the chuck body and axially and radially slides the jaws in their guides.