A chuck for removably holding a drill bit or like tool element, including a conical sleeve and a plurality of jaws biased apart and away from the tool element against the inner sleeve face by compression springs, the sleeve being threaded onto a spindle and a thrust disc between the spindle and jaws operable upon sleeve rotation to shift the jaws axially of the sleeve to either tighten the jaws against or release the tool element, and a collar keyed to the spindle but movable axially along the spindle and journaled to the sleeve and having a socket for rotatably receiving a lock key which in turn has teeth that cooperates with teeth on the adjacent sleeve end operable to rotate the sleeve relative to the spindle. In the tool art, a chuck frequently is used to releasably secure a drill bit or like tool element coaxially centered relative to a rotating spindle. In many instances, the cost of the chuck comprises a major portion of the total cost of the tool, particularly for example in a hand powered or low cost small electric drill. There are basically two types of chucks, one type having a key for mechanically tightening and loosening the chuck jaws relative to the tool element and the other type being only hand tightened. The key type chuck firmly holds the tool element and can be easily and quickly operated, but does have a relatively high cost. The hand tightened chuck is more economical than the key type chuck, but its tool element holding power and easiness of operation are not nearly as good.
A chuck has a chuck body adapted to be rotated about an axis and formed with an axial passage having a seat on which three jaws are slidable to grasp a tool shank. A tightening ring is formed on its inner periphery with threads that engage threads on the jaws to displace them axially. A cylindrical sleeve has one end resting on an outside ledge formed on the ring and is deformed at this one end into a groove on the ring which has a sharp edge that bites into the sleeve.
A drill chuck arrangement for connecting a drill bit to a spindle of a drilling machine comprises a spindle member threaded onto the spindle, and a jaw-actuating member mounted at least in part about the spindle member for concentric turning about the latter. A plurality of opposed clamping jaws are movable towards and away from each other in response to the aforementioned concentric turning. The spindle member has a radial bore which receives a portion of an actuating tool having beveled gear means. Upon turning the tool, the beveled gear meshes with a cooperating gear on the jaw-actuating member so as to turn the same relative to the spindle member, and thereby clamp or release a drill bit inserted in between the clamping jaws. A bushing is provided intermediate the spindle member and the jaw-actuating member to prevent binding between these members.
A chuck with key tightening, for a machine such as an electric drilling machine, comprising gripping means for gripping a tool such as jaws, which are guided in a translatory movement in grooves which are inclined with respect to the longitudinal axis of the chuck and which are machined in the chuck body, the chuck being characterized in that it comprises a toothed ring to which a tightening nut is connected, the nut cooperating with the threads of the gripping means, the toothed ring being provided in the region of its teeth with at least one retaining region whose internal diameter is smaller than the external diameter of the tightening nut, at least one component or at least one group of components having the same function, movable with respect to the chuck body, that is to say, the jaws and/or the nut and/or the toothed ring, being of sintered metal. The chuck is particularly advantageous for use on a percussion drilling machine, if desired, because the features of construction prevent its components from becoming disconnected.
A maually operated tool or driver for Allen head screws in which clamping jaws are reciprocated to and from a clamping position by turning of a knurled sleeve. The jaw clamps against a hexagonal operating rod, which can be slid into position through a passageway extending from end to end and through the tool body. This enables the rod to be applied to the tool from either end and militates against the necessity of a predetermined length for the rod. The operating rod fits the socket of the Allen head screw for tightening or loosening it. Flats on the working end of the clamping jaws flatwise engage the side of the rod for insuring against relative turning movement between the rod and the jaws.
A flexible shaft drive for drill chucks is disclosed. The flexible drive of the present invention comprises a flexible shaft for extending between an electric drill and a chuck for holding drills or other tools. A support sleeve is provided which encircles the chuck for rotatably supporting the chuck during use. In a preferred embodiment a bearing is interposed the chuck and the sleeve to aid in supporting the chuck during use.
