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. 19, 1993
Filed:
Jan. 21, 1993
Michael Feldman, Howell, NJ (US);
Moshe Meller, Princeton, NJ (US);
Erah Meller, Haifa, IL;
Abstract
A rotary dental drive tool has a rotatable driving member which is connected to a working tool via a self-tightening chuck, the rotatable driving member rotating in a clockwise direction during use. The chuck includes a chuck member having a tool-engaging internal surface portion for receiving a working tool therein, the chuck member having a tapered outer surface portion which is engageable with a tapered inner surface portion of the rotatable driving member so as to press the tool-engaging internal surface portion of the chuck member against the working tool to fixedly engage the working tool with said rotatable driving member via the chuck member. The chuck member has a left-hand threaded screw member on an outer surface portion thereof, which is engageable with a left-hand threaded screw portion on an inner surface portion of the rotatable driving member. The chuck member is rotatable in a left-hand threaded manner into the screw threaded portion of the rotatable driving member so as to cause the tapered surfaces to mutually engage and press the tool-engaging surface portion of the chuck member against the working tool responsive to rotation of the rotatable driving member, whereby the chuck member automatically self-tightens against the working tool during operation of the dental drive tool, and the working tool rotates with the rotatable driving member.