Title:
A SELF-TIGHTENING KEYLESS CHUCK
Document Type and Number:
WIPO Patent Application WO/2003/084700
Kind Code:
A1
Abstract:
The present invention relates to a self-tightening keyless chuck to enable electric percussive drills to grip a tool shank. The chuck includes a rear sleeve, a body, a bearing ring, a bearing assembly, a nut, a jaw, a front sleeve and a stopper and so on. The bearing assembly utilizing a ball bearing is positioned between the nut and the bearing ring. The surfaces of the bearing races of said nut and said bearing ring are provided with a circumferential arcuate race with a fixed depth, and the bottom surfaces of said circumferential arcuate race are provided with a plurality of ball-shape grooves. During the chuck grips a tool shank, the balls of said ball-bearing enter into the ball-shape grooves and are locked there, so as to prevent the tool from loosening due to the percussion vibration. In addition, the front sleeve engages with said nut through radial smooth press-fit to securely transmit a torque.
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Inventors:
TIAN XIANMING (CN)
PEI HUIJUN (CN)
SU LIHANG (CN)
XU QIAOYU (CN)
PEI HUIJUN (CN)
SU LIHANG (CN)
XU QIAOYU (CN)
Application Number:
PCT/CN2002/000554
Publication Date:
October 16, 2003
Filing Date:
August 09, 2002
Export Citation:
Assignee:
CNINA NORTH IND GROUP CORP SHA (CN)
TIAN XIANMING (CN)
PEI HUIJUN (CN)
SU LIHANG (CN)
XU QIAOYU (CN)
TIAN XIANMING (CN)
PEI HUIJUN (CN)
SU LIHANG (CN)
XU QIAOYU (CN)
International Classes:
B23B31/12; B23B45/14; (IPC1-7): B23B31/12; B23B45/14; B25D17/08
Foreign References:
| CN2233298Y | 1996-08-21 | |||
| CN2235871Y | 1996-09-25 | |||
| US5145194A | 1992-09-08 | |||
| US5174588A | 1992-12-29 |
Attorney, Agent or Firm:
CHINA SINDA INTELLECTUAL PROPERTY LTD. (No. 99 Jianguo Roa, Chaoyang District Beijing 0, CN)
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