Hydraulic breaker
CA 1266416 C · Owner: Hamada, Takatoshi · Inventors: Huang, Wen-Ho; Hamada, Takatoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a hydraulic breaker oil pressure at a fixed, value always flows in the low pressure circuit whenever the piston is raised or lowered. This avoids the need for an accumulator in this circuit. At the same time a, quantity of the high pressure oil is required for each of the rising and falling movements of the piston which, brings about less change in surge pressure again resulting, in no necessity for an accumulator in the high pressure circuit. The breaker also has an increased striking force because, when the piston is lowered to strike the chisel the high pressure oil is used as well as the reaction force of compressed gas.
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 March 6, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 6, 2007.
- 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.