Chuck includes cylindrical housing with central bore and two sets of holes extending from the bore to side surface of housing, said sets being spaced apart axially of the housing and the holes in each set being spaced apart circumferentially thereof. Actuating pistons are disposed in said holes and project from side surface of housing, and a drive piston is disposed in bore between two sets of holes. A collar is mounted on housing for movement axially thereof and has on its inner side cam surfaces which slope relative to side surface of housing and respectively engage projecting ends of actuating pistons in two sets of holes. Fluid disposed in bore between actuating pistons and drive piston cause latter to move axially of bore when collar moves axially of housing and thereby forces one set of actuating piston toward bore while permitting other set of actuating pistons to move away from bore. A collet having jaws therein is attached to housing, and shaft connected to drive piston varies spacing between jaws when drive piston moves in bore.
A pneumatic tool holder comprises a hollow, cylindrical case having a tapered, open nose. Mounted within the case are a hollow finger guide having radially spaced longitudinal guide slots receiving a plurality of grip fingers, and a piston to which the fingers are connected. A sleeve mounted for free rotation on the case connects to a compressed air source and communicates through a port with the interior of the case, behind the piston. Compressed air introduced into the case drives the piston in a first direction. Spring means mounted within the case drive the piston in the reverse direction. This alternately advances and retracts the fingers into tool-gripping and tool-releasing positions, respectively.
A drill chuck has a chuck body carrying a nonrotatable but axially displaceable tightening cone which displaces radially a plurality of angularly equispaced tool-engaging jaws. The tightening cone is axially shifted by a rotatable but axially fixed tightening sleeve threadedly engaging the cone and manually displaceble on the body. This sleeve is connected by a torque-responsive clutch with a rotatable and axially shiftable tightening ring with the chuck slipping after the jaws engage the workpiece to permit relative rotation of the sleeve and the ring. The sleeve and the ring are threadedly interconnected so that further rotation of the ring causes an axial displacement thereof and the ring displaces a piston which pressurizes a cylinder forming a hydraulic cushion for a working piston bearing upon the chuck jaws in the axial direction.
A device for clamping tools, such as a shank-end mill, comprises an adjusting nut having a bore for receiving and actuating an adapter sleeve for mechanical clamping of the tool. The adjusting nut has at least one pressure medium chamber accommodating a piston and opening into the bore where it is sealed by means of a membrane adapted to rest against the adapter sleeve. A complementary nut is mounted on said adjusting nut for displacing said piston within said chamber, thereby to effect pressure medium-controlled, complementary clamping of the tool.
A drill/driver chuck mechanism has a cylindrical member 2 with a central axial bore 4. A plurality of further bores 6 are slanted with respect to the central axial bore 4. Jaws 8 each associated with a bore 6 are moveable via a jaw actuator 10. A jaw locking means 32-60 is coupled to the jaw actuator 10. The jaw locking means may move between an open position and a closed position such that the jaws may be locked within their respective bore 6 regardless of the degree of protrusion of the jaws 8 into the central axial bore 4.
A drill has a chuck with a body member and a bore to receive a cutting tool. A plurality of jaw members are coupled with the body to retain the cutting tool in the bore. A mechanism to secure the cutting tool in the jaws is coupled with the body. The mechanism applies a biasing force on the jaw members which enables the jaw members to slide on the body between a locked position securing the cutting tool in the jaw members and an unlocked position which enables egress and ingress of the cutting tool into and out of the jaw members.
