Chain saw safety switch
CA 1205723 A · Owner: Wessendorf, Walter F. Jr. · Inventors: Grogan, Victor A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a safety handle that is rotatively mounted on the existing front handle of the chain saw and is operatively connected to the existing on-off switch to independently actuate such switch to shut off the engine and stop the cutting chain upon rotation of such safety handle to its "off" position either automatically when kick-back occurs or upon such rotation by the human operator at his option. A wrist guide struck by the human operator's hand during severe kick-back or when the chain saw is dropped similarly rotates the safety handle to its "off" position. An automatic reset mechanism restores the safety handle to its "on" position after the safety handle has been rotated to its …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted June 10, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 10, 2003.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.