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US 4,808,049 AGranted
Cam actuated collet tool holder
OwnerHarold D. Cookinventor
Life of this patent
Estimating the term…
Abstract
An improved collet tool holder is disclosed characterized by use of formed cam surfaces upon the collet and tightening sleeve of the tool holder. Selective rotation of the sleeve relative to the collet causes selective, ramping, engagement of the complementary cam surfaces which causes selective compression of the collet to securely grip a cutting tool. The collet's internal aperture may optionally present a formed cam surface which engages a complementary cam surface formed upon the shank of the cutting tool.
Claims9
A chuck for use on a machine tool spindle comprising:
- a collet having narrow axial slots about an interior axial aperture which is sized to receive a tool shank, and having an exterior cam surface which cam surface is everywheres parallel to the aperture's axis;
- a tightening sleeve positioned about the collet having an interior cam surface complementary to the exterior cam surface of the collet;
- wherein selective rotation of the tightening sleeve relative to the collet causes selective engagement of the complementary cam surfaces which causes selective compression of the collet to grasp the shank of a tool disposed in the axial aperture and
- wherein said collet's internal axial aperture is formed having an interior cam surface complementary to an exterior cam surface formed on the tool shank.
1 more element
A method of tightening a chuck about a tool shank comprising:
- inserting a tool shank axially into a central interior axial aperture of a collet of a chuck;
- fixing the depth of the axial insertion of the tool shank into the aperture by tightening a transversely mounted set screw within the collet;
- and
- rotating a tightening sleeve located around the collet relative to the collet so that a collet exterior cam surface which is everywheres parallel to the aperture's axis is ramped against a complementary tightening sleeve interior cam surface which is also everywheres parallel to the aperture's axis;
- wherein the ramping of the complementary cam surfaces compresses the collet which compressively tightens about the tool shank.
2 more elements
Dependencies are inferred from the claim text.