Drill chuck for use in percussion drilling

Patent 4630836 Issued on December 23, 1986. Estimated Expiration Date:

January 21, 2006. 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

93108

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Inventors

Assignee

Hilti Aktiengesellschaft

Application

No. 06/820833 filed on 01/21/1986

US Classes:

279/19, Lost motion279/123, Jaws279/66Radially reciprocating jaws

Examiners

Primary: Weidenfeld, Gil
Assistant: Howell, Daniel W.

Attorney, Agent or Firm

Toren, McGeady, Stanger, Goldberg & Kiel

International Classes

B23B 31/00 (20060101)
B23B 31/12 (20060101)
B25D 17/00 (20060101)
B25D 17/08 (20060101)

Foreign Application Priority Data

1983-03-21 DE

Abstract

In a chuck for use in a drilling device, such as a hammer drill, capable of performing rotary or rotary/percussion drilling, clamping jaws are provided to secure a tool in the drilling device. The clamping jaws each have a convex surface transverse to the chuck axis and with the surface directed inwardly toward the axis. The more radially inward portion of the convex surface has a V-shaped notch extending in the axial direction of the chuck. The notch forms a pair of spaced edges which grip the surface of the tool secured in the chuck so that the tool can be reliably rotated.