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:
Aug. 07, 1990
Filed:
Feb. 10, 1989
Giovanni De Bastiani, Verona, IT;
Giovanni Faccioli, Monzambano, IT;
Roberto Aldegheri, San Giovanni Lupatoto, IT;
Lodovico R Brivio, Castenedolo, IT;
Orthofix S.r.l., Verona, IT;
Abstract
The invention is a self-gradually locking chuck for drills and similar devices. It is particularly suitable for portable drills in surgical use. The chuck has a cylindrical sleeve that can be fixed axially to the shaft of a drill and predominantly tapering ferrule with lobes. The ferrule can be axially engaged with the sleeve. Means for centering a tool and at least one spring are located within a hollow space in the sleeve. The chuck also has a mounting with a passage and holes for housing jaws. The mounting and the ferrule are axially movable with respect to each other and the sleeve. Jaws, located in the holes and urged toward the axis of the chuck by the lobes, hold a tool that has been inserted between the jaws. The chuck further has an annular ring which can be screwed onto an externally threaded portion of the mounting projecting from the ferrule. The annular ring serves to engage the tool in a locked condition to prevent accidental release of the tool by the chuck.