Drill chuck
OwnerGunter Horst Rohminventor
Life of this patent
Estimating the term…
Abstract
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.
Claims10
A drill chuck comprising:
- a chuck body having an axis and adapted to be fixed to a drilling machine spindle;
- a tightening cone mounted on said body for displacement axially relative thereto but angularly fixed on said body;
- a plurality of chuck jaws radially displaceable by said cone and axially aligned with said body;
- a tightening sleeve rotatable on said body but axially fixed relatively thereto and threadedly engaging said cone for axially displacing same upon angular displacement of said sleeve;
- a tightening ring rotatable and axially shiftable on said body;
- a torque-responsive clutch between said sleeve and said ring effective to couple said sleeve to said ring for joint angular displacement below a predetermined torque and to allow rotation of said ring relative to said sleeve upon the application of a torque above said predetermined torque to said ring;
- a power piston axially displaceable in said body, said body forming a power cylinder receiving said power piston, said ring being threaded onto said sleeve and said power piston bearing upon jaws for applying axial force thereto upon pressurization of said cylinder;
- and
- pressurizing means operated by relative axial displacement of said ring and said body for pressurizing said cylinder, said pressurizing means having a smaller cross section than that of said power piston.
Dependencies are inferred from the claim text.