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. 15, 1991
Filed:
Jun. 14, 1990
Applicant:
Inventors:
Jean Metz, Luxembourg, LU;
Severino Venturini, Obercorn, LU;
Assignee:
Paul Wurth S.A., , LU;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23B / ; F27D / ;
U.S. Cl.
CPC ...
4082 / ; 266271 ; 279 28 ;
Abstract
The device includes a chuck designed to be secured to a working tool and which has a front cavity for receiving an end of a drilling rod and a gripping device for fastening the end of the rod in this cavity. The gripping device is actuated by pneumatic or hydraulic pistons, sliding in a cylindrical chamber closed at the rear by a plug. In order to avoid rapid wear of this plug, a spring is arranged between the said plug and the adjacent face of the piston, the spring being strong enough to keep the piston away from the plug.