Self-closing trailer coupler
CA 1067537 A · Owner: Hammerblow Corporation (The) · Inventors: Pierce, William C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A coupler for a trailer and the like, the coupler having a body and cap hinged together at a front portion and closeable along parting faces and having an internal cavity formed by the body and the cap for the ball which is conventionally secured to either the trailer or the towing vehicle. The body forms a major portion of the ball cavity and includes a ball centering upper surface which extends substantially laterally across the upper surface of the cavity forming a self-centering bearing surface for the ball. An automatic closing means is formed on a front portion of the cap and body wherein insertion of the ball into the ball cavity automatically closes the cap with respect to the body. …
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 December 4, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 4, 1996.
- 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.