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:
Jul. 07, 1987
Filed:
Apr. 01, 1986
Hans Speidel, Nurtingen, DE;
Montanwerke Walter GmbH, Tuoingen, DE;
Abstract
A radially expansible thin-walled expansion sleeve (13) is expansible under hydraulic pressure by pressing a piston element (17) against hydraulic fluid in a chamber, upon operation of a threaded bolt (18) in a threaded bore (19) in the spindle (11) or an attachment element (12) connected thereto. To prevent loss of the grinding disk, and provide a safety interlock in case of leakage of hydraulic fluid and hence loss of frictional engagement due to the expansion sleeve, a safety lock is formed by a sleeve element (22) which has resilient tines (24) extending therefrom, formed with locking projections (25), radially expanded behind a shoulder (30) formed on a disk holding bushing (1) upon tightening of the bolt (18). The tines (24) have internal camming surfaces (26) which engage against conical surfaces (27) located on the spindle (11) or the attachment (12) thereto. The spindle or the attachment and the disk holding bushing are, additionally, coupled for conjoint rotation by engagement pins (31) fitting into respective reception openings (32).