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. 08, 1988
Filed:
Feb. 27, 1987
Hermann Kieser, Nurtingen, DE;
Norbert Schur, Metzingen, DE;
Metabowerke GmbH & Co., Nurtingen, DE;
Abstract
A portable chain saw wherein the motor drives a hub which is coaxial with a cylindrical portion of the shaft for one sprocket wheel of the chain. A coil spring is wound around the hub and the cylindrical portion to normally transmit torque from the hub to the shaft and to brake the shaft in response to its disengagement from the hub as a result of pivoting of a guard for one hand of the operator. The guard is pivoted by the one hand when the chain saw wobbles or performs other undesirable movements. The coil spring, the hub and the cylindrical portion together constitute a so-called wrap spring clutch wherein the spring rotates with the hub until arrested by a pin-shaped decoupling element which is movable radially of the hub by a second spring in response to pivoting of the guard.