The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 09, 2007
Filed:
Aug. 04, 2003
Scott W. Allan, Kitchener, CA;
Maz A. Hasan, Kitchener, CA;
Satnam Singh, Waterloo, CA;
Kailash C. Vasudeva, Waterloo, CA;
Scott W. Allan, Kitchener, CA;
Maz A. Hasan, Kitchener, CA;
Satnam Singh, Waterloo, CA;
Kailash C. Vasudeva, Waterloo, CA;
Maxtech Manufacturing Inc., Waterloo, Ontario, CA;
Abstract
A chuck is provided for retaining the shank of a tool bit or accessory, having a fixed diameter, inserted in a central channel at a distal end of the chuck. At least one torsion spring is mounted axially within a housing and has an inner dimension and shape comparable to the shank's outer dimension and shape. A mechanism winds and unwinds the torsion spring to respectively grip or release said shank, the winding being in a rotational direction consistent with a normal operating rotational direction of said chuck such that said shank tends to further wind the torsion spring for further self-tightening in normal operation.