The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 27, 1979
Filed:
Apr. 06, 1977
Tomomitsu Iizumi, Tokyo, JP;
Shoketsu Kinzoku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A fluid circuit including an actuator, a flow-direction change-over valve and a pressure source. The actuator includes a piston-rod-side chamber and a piston-head-side chamber which are partitioned by a piston. In a fluid path leading from the piston-head-side chamber to the flow-direction change-over valve, there is provided a flow-rate-control, pressure-regulating valve assembly for regulating a fluid pressure to be fed into the piston-head chamber, thereby saving energy required for a return stroke of a piston. In another fluid path leading from the piston-head-side chamber to the flow-direction change-over valve, there is provided a check valve and throttle valve assembly. The check valve in the valve assembly may be of a type which allows the flow of a fluid only in the direction towards the piston-head-side chamber (a meter-in control) or may be of a type which allows the flow of a fluid only in the direction from the piston-head-side chamber (meter-out control). For accelerating an advancing stroke of a piston in the meter-in control type actuator at a safe speed, a speed control safety valve and a quick discharge valve assembly is incorporated in the fluid path leading to the cylinder-head-side chamber in the actuator in place of the aforesaid check valve and a throttle valve assembly.