Drill chuck with brake ring

Patent 4913449 Issued on April 3, 1990. Estimated Expiration Date:

December 16, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

2338753

3325166

Chuck brake
Patent #: 4323324
Issued on: 04/06/1982
Inventor: Eberhardt

Keyless chuck gripping device
Patent #: 4460296
Issued on: 07/17/1984
Inventor: Sivertson, Jr.

Automatic jaw control for reversible power tool
Patent #: 4526497
Issued on: 07/02/1985
Inventor: Hatfield

Keyless chuck for rotary tool
Patent #: 4695065
Issued on: 09/22/1987
Inventor: Komatsu , et al.

Chuck actuator device and method
Patent #: 4817971
Issued on: 04/04/1989
Inventor: Flynn

Selftightening drill chuck Patent #: 4836563
Issued on: 06/06/1989
Inventor: Rohm

Inventor

Rohm, Gunter Horst

Application

No. 285715 filed on 12/16/1988

US Classes:

279/60, Obliquely guided reciprocating jaws279/63Threaded central cone and jaw

Examiners

Primary: Howell, Daniel W.

Attorney, Agent or Firm

Dubno; Herbert, Wilford; Andrew

Foreign Patent References

1800418 DE 05/11/1970

International Class

B23B 031/06

Foreign Application Priority Data

1988-01-14 DE

Abstract

A chuck comprises a body centered on an axis and adapted to be mounted on a drill spindle for rotation about the axis and a tightening sleeve carried on the body and rotatable thereon about the axis. The sleeve or body is formed centered on the axis with an array of angularly equispaced guides inclined to the axis and the other element is formed centered on the axis with a screwthread formation. Respective jaws are displaceable axially and radially of the axis in the guides relative to the axis and are formed with teeth meshing with the screwthread so that rotation of the sleeve relative to the body in one rotational sense moves the jaws axially forward and radially together and opposite rotation moves them axially backward and radially apart. A braking sleeve rotatable on the tightening sleeve has an inner surface engageable with the tightening sleeve and this inner surface can be pressed radially into engagement with the tightening sleeve.