US4175473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid circuit
Assignee: Shoketsu Kinzoku Kogyo KK
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Filing: 1977-04-06
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Granted: 1979-11-27
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Expires: 1997-04-06
Abstract
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.
Inventors
- 👤 Tomomitsu Iizumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:46
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/01; F15B11/00; F15B11/02; F15B11/06; F15B11/064; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20538; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/30525; F15B2211/31; F15B2211/3105; F15B2211/3116; F15B2211/3122; F15B2211/3127; F15B2211/32; F15B2211/327; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/40576; F15B2211/40584; F15B2211/415; F15B2211/41572; F15B2211/42; F15B2211/421; F15B2211/423; F15B2211/455; F15B2211/46; F15B2211/50; F15B2211/505; F15B2211/50554; F15B2211/52; F15B2211/528; F15B2211/55; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7053; F15B2211/75
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
372 words
A fluid circuit comprising: an actuator having a piston-head-side chamber and a piston-rod-side chamber and a first piston separating said chambers; a flow-rate-control, pressure-regulating valve assembly having an inlet port and an outlet port; a flow-direction change-over valve connected to the inlet port of said flow-rate control, pressure-regulating valve assembly; and a pressure source connected to said flow-direction change-over valve; said piston-rod-side chamber being connected to the outlet port of said flow-rate-control, pressure-regulating valve assembly and from the inlet port thereof to said flow-direction change-over valve and through said change-over valve to said pressure source, thereby establishing a first fluid path for a return stroke of said first piston, and a second fluid path connecting said piston-head-side chamber in bypassing relationship around said flow-rate-control pressure regulating valve assembly to said flow-direction change-over valve and therethrough to said pressure source, thereby establishing said second fluid path for an advancing stroke of said first piston, said flow-rate-control, pressure-regulating valve assembly comprises: a fluid passage in said assembly leading from said inlet port via a pressure regulating valve and then a flow-rate control valve to said outlet port; said flow rate control valve having a valve body, a valve stem and a valve-stem-position adjustable portion, said valve body being spring loaded so as to be urged against the top of said valve stem, thereby restricting said fluid passage; said pressure regulating valve including a valve body spring-loaded in the direction to close said fluid passage, and a second piston which is spring-loaded so as to force said valve body in the direction to open said fluid passage through the medium of a rod confined between said valve body and said second piston, whereby said second piston permits said pressure regulating valve to maintan a predetermined pressure in a fluid flowing through said fluid passage, said pressure regulating valve further including a communicating hole allowing the introduction of a fluid from said fluid passage to said second piston, whereby when a pressure of a level exceeding a given pressure level is introduced into said fluid passage said second piston is displaced against the spring-loaded effect and hence said rod is pushed back by the spring-loading in said valve body, thereby closing flow through said fluid passage.
Claim 2
Dependent Claim
372 words
A fluid circuit comprising: an actuator having a piston-head-side chamber and a piston-rod-side chamber and a first piston separating said chambers; a flow-rate-control, pressure-regulating valve assembly having an inlet port and an outlet port; a flow-direction change-over valve connected to the inlet port of said flow-rate control, pressure-regulating valve assembly; and a pressure source connected to said flow-direction change-over valve; said piston-rod-side chamber being connected to the outlet port of said flow-rate-control, pressure-regulating valve assembly and from the inlet port thereof to said flow-direction change-over valve and through said change-over valve to said pressure source, thereby establishing a first fluid path for a return stroke of said first piston, and a second fluid path connecting said piston-head-side chamber in bypassing relationship around said flow-rate-control pressure regulating valve assembly to said flow-direction change-over valve and therethrough to said pressure source, thereby establishing said second fluid path for an advancing stroke of said first piston, said flow-rate-control, pressure-regulating valve assembly comprises: a fluid passage in said assembly leading from said inlet port via a pressure regulating valve and then a flow-rate control valve to said outlet port; said flow rate control valve having a valve body, a valve stem and a valve-stem-position adjustable portion, said valve body being spring loaded so as to be urged against the top of said valve stem, thereby restricting said fluid passage; said pressure regulating valve including a valve body spring-loaded in the direction to close said fluid passage, and a second piston which is spring-loaded so as to force said valve body in the direction to open said fluid passage through the medium of a rod confined between said valve body and said second piston, whereby said second piston permits said pressure regulating valve to maintan a predetermined pressure in a fluid flowing through said fluid passage, said pressure regulating valve further including a communicating hole allowing the introduction of a fluid from said fluid passage to said second piston, whereby when a pressure of a level exceeding a given pressure level is introduced into said fluid passage said second piston is displaced against the spring-loaded effect and hence said rod is pushed back by the spring-loading in said valve body, thereby closing flow through said fluid passage.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |