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:
Nov. 11, 2003
Filed:
Nov. 30, 2001
Ferdinand Kristen, Gilching, DE;
Hans-Werner Bongers-Ambrosius, Munich, DE;
Peter Hellmann, Obermeitingen, DE;
Hilti Aktiengesellschaft, Schaan, LI;
Abstract
A safety clutch for an electric hand-held tool and including a rotor ( ), an anchor disc ( ) frictionally engageable with the rotor ( ) for transmitting a torque there-between, a stationary axial stop ( ) for limiting the air gap (s) between the rotor and the anchor disc and engageable by the anchor disc under an axial reserved pre-stress applied to the anchor disc (g); and a stationary electromagnetic coil ( ) provided on a side of the rotor ( ) remote from the anchor disc ( ) and coaxial with the rotor ( ) for generating a rotationally symmetrical magnetic flux (&phgr;) for attracting of the anchor disc (g) to magnetic poles ( ) associated with the rotor ( ).