Hydraulic cushioning system for press, having shut-off valve for disconnection of pressure-pin cylinders from power supply upon contact of movable die with workpiece
CA 2077510 C · Owner: Minami, Seiki · Inventors: Ono, Tsutomu; Kirii, Kazunari; Minami, Seiki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hydraulic cushioning apparatus for a press having, work-supporting pressure pins, hydraulic cylinders linked with the pressure pins, and a fluid passage connecting a hydraulic power supply to the hydraulic cylinders to apply, a preset hydraulic pressure to the cylinders. The apparatus includes a shut-off valve disposed in the fluid passage for connection and disconnection of the hydraulic power supply to and from the hydraulic cylinders, and a controller for controlling the shut-off valve such that the shut-off valve is closed before a movable die of the press comes into pressing contact with the workpiece, and is held in the closed position for at least a period which expires when the …
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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
- Filed September 3, 1992 and granted January 28, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 3, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 3, 2014.
- 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
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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.