Patent US3741244A successfully refreshed from Google Patents.
US3741244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve system
Assignee: Individual
•
Filing: 1972-03-30
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Granted: 1973-06-26
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Expires: 1992-03-30
Abstract
Abstract This valve system provides with a pilot valve having a valve action caused by a spool which moves within a casing providing with a pair of ports. In said pilot valve, the spool is forced to be pressed in a given direction by a compressed fluid introduced into the casing, the said compressed fluid, which is supposed to flow towards load from the feed source through the pilot valve, being changed-over by means of a change-over valve. In the case the change-over valve has been changed-over on the side of the pilot valve, therefore, said spool is not forced to be pressed but in turn forced to be pressed in the opposite direction by means of an operating means. In such a case just mentioned, a control means functions to discharge the fluid being present in the casing, said control means controls a moving speed of the spool by adjusting the amount of the discharge thereof. The pilot valve is effected to be opened or closed with said movement of spool, the operative time being controllable in proportion to the moving speed of the spool. The time to start operation of the pilot valve after receiving a control command by way of an operating signal given to the change-over valve can be controlled by the positioning relation between ports and grooves in speed, and the moving speed of spool.
Inventors
- 👤 Y Ise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:05
CPC Classifications
F; F16; F16N; F16N29/00; F16K; F16K37/00; F16K37/0025; F16K37/0041; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/8158; Y10T137/8225; Y10T137/8242
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
173 words
A valve system comprising a pilot valve consisting of a cylindrical casing having a pair of ports, a spool operatively connected within said casing and provided with grooves which acts a valve in cooperation with said pair of ports, a determination means for introducing compressed fluid, by which said spool is forced to be pressed to the operation-start-position, into said casing, a change-over means for feeding the compressed fluid from a feed source into either said pilot valve or determination means, an operating means for pressing said spool from its operation-start-position in the direction opposite to the pressing direction by way of said determination means when said change-over means is on the side of said pilot valve, a control means for discharging the fluid within said casing introduced by way of said determination means with the operation of said operating means; the discharge flow of fluid from said casing being controlled by said control means so as to control the moving speed of said spool by way of pressing by said operating means.
Claim 2
Dependent Claim
173 words
A valve system comprising a pilot valve consisting of a cylindrical casing having a pair of ports, a spool operatively connected within said casing and provided with grooves which acts a valve in cooperation with said pair of ports, a determination means for introducing compressed fluid, by which said spool is forced to be pressed to the operation-start-position, into said casing, a change-over means for feeding the compressed fluid from a feed source into either said pilot valve or determination means, an operating means for pressing said spool from its operation-start-position in the direction opposite to the pressing direction by way of said determination means when said change-over means is on the side of said pilot valve, a control means for discharging the fluid within said casing introduced by way of said determination means with the operation of said operating means; the discharge flow of fluid from said casing being controlled by said control means so as to control the moving speed of said spool by way of pressing by said operating means.
Claim 3
Dependent Claim
16 words
A valve system according to claim 1, wherein said pilot valve is operative at the operation-start-position.
Claim 4
Dependent Claim
25 words
A valve system according to claim 1, wherein said pilot valve is not operative at the operation-start-position but operative with the movement of the spool.
Claim 5
Dependent Claim
28 words
A valve system according to claim 1, comprising said operating means, which is a spring mounted within the casing opposite to the determination means putting said spool therebetween.
Claim 6
Dependent Claim
46 words
A valve system according to claim 1, comprising a means for introducing compressed fluid into the casing opposite to the determination means putting said spool therebetween and a means for discharging compressed fluid out of the casing with the pressing the spool by said determination means.
Claim 7
Dependent Claim
29 words
A valve system according to claim 5, wherein the said introducing means introduces a part of the compressed fluid which flows from said change-over means to the pilot valve.
Claim 8
Dependent Claim
31 words
A valve system according to claim 1, wherein said control means comprises a discharge valve in interlocking relation with said change-over means and a throttle valve connected with said discharge valve.
Claim 9
Dependent Claim
77 words
A valve system according to claim 1, wherein said pilot valve is not operative at the operation-start-position but operative with the movement of spool, said control means comprising a discharge valve in interlocking relation with said change-over means, two throttle valves, and a valve change-over means connected between the throttle valve and the discharge valve, said valve change-over means changes over said throttle valve from one to the other with the operation start of said pilot valve.
Claim 10
Dependent Claim
46 words
A valve system according to claim 1, further comprising a resetting means for holding said change-over means on the side of said determination means and an input means for chAnging over said change-over means on the side of said pilot valve against the said resetting means.
Claim 11
Dependent Claim
37 words
A valve system according to claim 9, further comprising a self-maintaining means for holding said change-over means on the side of said pilot valve, said self-maintaining means being operated only when said pilot valve is in operation.
Claim 12
Dependent Claim
41 words
A valve system according to claim 1, further comprising a switch for electrically detecting the operation completion of said spool, said switch being opened and closed with the movement of a pin having a head member which projects into said casing.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |