Chuck for rotary tools
OwnerRory Neil Adams, Kevin B. Smithinventors
Life of this patent
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Abstract
A chuck having a pair of opposed clamp pads, each pad engaging a tool shank at sharp corners along a pair of angularly-spaced lines of contact. Tapered outer surfaces on the clamp pads are crowned to engage a cooperating taper on a sleeve at the midpoint between the opposite ends of a pad. The clamp pads are carried by a guide bushing that reciprocates within a shaft bore to provide movement of the clamp pads inwardly or outwardly.
Claims17
A chuck having a pair of opposed clamp pads carried by a reciprocal bushing within a sleeve, cooperating tapers between said clamp pads and said sleeve for providing movement of said clamp pads radially inwardly or outwardly responsive to axial movement of said guide bushing, and said clamp pad tapers being crowned to provide tangency with said sleeve taper at a location between the opposite ends of the clamp pads.
A chuck having a pair of opposed clamp pads, each clamp pad having a pair of angularly-spaced clamping corners that make line contact with a cylindrical tool shank, and said corners being angularly spaced between 40-90°.
A chuck for rotary tools comprising:
- a shaft having front and rear ends;
- a central cylindrical bore extending into said shaft from said rear end toward said front end and terminating at a shoulder, said bore having a bore bottom;
- a central cylindrical hole extending into said shaft from said shaft front end, said hole having a hole diameter smaller than said bore diameter and intersecting said bore radially inwardly of said bore bottom;
- a sleeve secured within said bore in axially-spaced relationship to said shoulder, said sleeve having a sleeve taper facing toward said shaft front end;
- a guide bushing received in said sleeve for axial movement relative thereto;
- a pair of opposite clamp pads carried by said guide bushing, said clamp pads having outer pad tapers engaging said sleeve taper for providing movement of said clamp pads radially inwardly when said guide bushing moves away from said front end and radially outwardly when said guide bushing moves toward said front end;
- said clamp pads have opposed inner clamping surfaces between which a tool shank is receivable;
- and
- a spring in said bore between said bore bottom and said guide bushing, said spring normally biasing said guide bushing away from said shaft front end.
Dependencies are inferred from the claim text.