Linkage mechanism for digging implement
CA 1111384 A · Owner: Northwest Engineering Company · Inventors: Brandtjen, Sheldon J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, A crane-excavator or the like has a boom a saddle, a translatable stick and a digging implement. A stick cylinder and implement cylinder are provided. The ends of the stick and implement cylinder rams are connected to common lever arms which are pivoted to the stick on a transverse axis which is offset from the ram-lever connections and form the stick center line. The lever arms are connected to the digging implement in a manner so that the combined forces from both rams are transmitted to the implement to pivot the latter about its axis. The simultaneous movement of the stick cylinder ram and the implement cylinder ram causes the stick to extend or retract, thus causing a shift …
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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 October 27, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 27, 1998.
- 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.