Patent US3693350A successfully refreshed from Google Patents.
US3693350A
Expired / Lapsed
US
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Hydraulic control circuits and apparatus
Assignee: Commercial Shearing Inc
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Filing: 1971-01-11
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Granted: 1972-09-26
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Expires: 1991-01-11
Abstract
Abstract A fluid circuit is provided for operation of multiple motors which comprises a pair of sources of high pressure fluid, two groups of directional control valves, each group containing at least two directional control valves separated by a signal block, each directional control valve operatively connected to deliver fluid to a fluid motor, one of said groups of valves being connected on opposite sides of a first signal block to each of said pumps through a pressure compensating valve, the other of said groups of valves being connected on opposite sides of a second signal block to each of said pumps through a pressure relieved inlet section, said second signal block in said other group including a pair of pressure operated spools regulating the flow of fluid from the two pumps to the directional control valves in said other group whereby the valves on either side of the second signal block can receive fluid from both pumps so long as only valves on one side or the other of the signal block are operative and receive fluid only from one pump at each side of the second block when valves on both sides are operative and shuttle valve means in connections between the signal blocks of each group whereby valves in each group may be simultaneously operated without starving the highest pressure motor.
Inventors
- 👤 John D Petro
- 👤 Robert F Hodgson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:27
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B11/17; B; B62; B62D; B62D11/00; B62D11/02; B62D11/06; B62D11/10; B62D11/14; B62D11/18; B62D11/183; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/20576; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/30525; F15B2211/3053; F15B2211/30535; F15B2211/31; F15B2211/3105; F15B2211/3111; F15B2211/35; F15B2211/351; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/40523; F15B2211/415; F15B2211/41509; F15B2211/41518; F15B2211/45; F15B2211/60; F15B2211/605; F15B2211/6051; F15B2211/6054; F15B2211/65; F15B2211/70; F15B2211/71; F15B2211/7142; F15B2211/78
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
221 words
A fluid circuit for operation of multiple fluid motors comprising a pair of sources of high pressure fluid, two groups of directional control valves, each group containing at least two directional control valves separated by a signal block, each directional control valve operatively connected to deliver fluid to a fluid motor, one of said groups of valves being connected on opposite sides of a first signal block to each of said pumps through a pressure compensating valve, the other of said groups of valves being connected on opposite sides of a second signal block to each of said pumps through a pressure relieved inlet section, said second signal block in said other group including a pair of pressure operated spools regulating the flow of fluid from the two pumps to the directional control valves in said other group whereby the valves on either side of the second signal block can receive fluid from both pumps so long as only valves on one side or the other of the signal block are operative and receive fluid only from one pump at each side of the second block when valves on both sides are operative and shuttle valve means in connections between the signal blocks of each group whereby valves in each group may be simultaneously operated without starving the highest pressure motor.
Claim 2
Dependent Claim
221 words
A fluid circuit for operation of multiple fluid motors comprising a pair of sources of high pressure fluid, two groups of directional control valves, each group containing at least two directional control valves separated by a signal block, each directional control valve operatively connected to deliver fluid to a fluid motor, one of said groups of valves being connected on opposite sides of a first signal block to each of said pumps through a pressure compensating valve, the other of said groups of valves being connected on opposite sides of a second signal block to each of said pumps through a pressure relieved inlet section, said second signal block in said other group including a pair of pressure operated spools regulating the flow of fluid from the two pumps to the directional control valves in said other group whereby the valves on either side of the second signal block can receive fluid from both pumps so long as only valves on one side or the other of the signal block are operative and receive fluid only from one pump at each side of the second block when valves on both sides are operative and shuttle valve means in connections between the signal blocks of each group whereby valves in each group may be simultaneously operated without starving the highest pressure motor.
Claim 3
Dependent Claim
35 words
A fluid circuit as claimed in claim 1 wherein each of said two groups of valves includes three directional control valves, two on one side and one on the opposite side of each signal block.
Claim 4
Dependent Claim
50 words
A fluid circuit as claimed in claim 1 wherein said first signal block includes two signal passages, one connecting the valves on one side of the block to said shuttle valve means and the other connecting the valves on the other side of the block to said shuttle valve means.
Claim 5
Dependent Claim
60 words
A fluid circuit as claimed in claim 3 wherein said shuttle valve means includes a pair of spaced shuttle valves, one connected to each of said two signal passages, each of said pair of shuttle valves being connected to the second signal block whereby pressure changes in said second signal block are reflected in changed position of the shuttle valves.
Claim 6
Dependent Claim
94 words
A fluid circuit as claimed in claim 4 wherein the second signal block includes a pair of pressure responsive valves controlling the flow of fluid between the directional valves on one side of said signal block and the directional valves on the other side of said signal block whereby the operative valves on either side of said block receive fluid from both pumps so long as no valve is operated on the other side of the block and receive fluid from only one pump when valves on both sides of said block are operative.
Claim 7
Dependent Claim
21 words
A fluid circuit as claimed in claim 1 wherein a check valve is inserted between the pumps and the inlet section.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |