Claims
- 1. For use in a fluid pressure system including high pressure, drain pressure, and common clutch-brake, inlet-outlet conduits:
- pressure setting valve assembly means having a bore therein communicating with said conduits and controllably connecting the high and drain pressure conduits for generating a common clutch-brake pressure in the inlet-outlet conduit;
- said valve assembly means including a metering spool disposed in said bore and actuating means for selectively moving said spool within said bore, said actuating means being responsive to the generation of said common clutch-brake pressure to move said spool for affording inlet-outlet flow in said inlet-outlet conduit; and
- a shuttle in the spool having first and second operating positions, said spool including bypass means communicating with said drain conduit, and spool actuating means for placing said shuttle in said first position for communicating said inlet-outlet conduit with said bypass means and in said second operating position for blocking communication between said bypass means and said inlet-outlet conduit. PG,55
- 2. For use in a fluid pressure system including high pressure, drain pressure and common clutch-brake, inlet-outlet conduits:
- signal pressure setting valve assembly means having a bore therein for communicating with said conduits and controllably connecting the high and drain pressure conduits for producing a common clutch-brake pressure in the inlet-outlet conduit;
- said valve assembly means including a metering spool disposed in said bore and actuating means for selectively moving said spool within said bore, said actuating means being responsive to the generation of said common clutch-brake pressure to move said spool for affording inlet-outlet flow in said inlet-outlet conduit; and,
- a shuttle in the spool having first and second operating positions, said spool including bypass means communicating with said drain conduit, and spool actuating means for placing said shuttle in said first position for communicating said inlet-out conduit with said bypass means and thence, with said drain conduit, and in said second operating position for blocking communication between said bypass means and said inlet-outlet drain, said shuttle being movable within the second operating position for controllably connecting the high and drain pressure conduits for modulating the common clutch-brake pressure in said inlet-outlet conduit.
- 3. The invention of claim 2 characterized by:
- said spool projecting at one end into an actuator end chamber in said bore; and
- means in communication with the inlet-outlet conduit to restrictively fill said end chamber and displace the spool into operative position when the common clutch-brake pressure has been established in said conduit.
- 4. The invention of claim 2 characterized by:
- said shuttle projecting at one end into an actuator end chamber in said spool; and,
- means in communication with the inlet-outlet conduit to restrictively fill said end chamber and displace the shuttle into said subsequent enabling position when the common clutch-brake pressure has been established in said conduit.
Parent Case Info
This is a division of application U.S. Ser. No. 526,195 filed Aug. 25, 1983, now abandoned, which in turn is a division of application U.S. Ser. No. 287,539 filed June 22, 1981 (now U.S. Pat. No. 4,428,468 dated Jan. 31, 1984) which in turn is a continuation-in-part of application U.S. Ser. No. 176,815 filed Aug. 11, 1980 (now U.S. Pat. No. 4,372,408 dated Feb. 8, 1983), which in turn is a continuation of application U.S. Ser. No. 951,690 filed Oct. 16, 1978, now abandoned, and related to application U.S. Ser. No. 436,159 filed Oct. 22, 1982 (now U.S. Pat. No. 4,438,780 dated Mar. 27, 1984), which in turn is a division of application U.S. Ser. No. 176,815 filed Aug. 11, 1980 (now U.S. Pat. No. 4,372,408 dated Feb. 8, 1983).
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4015619 |
Shore et al. |
Apr 1977 |
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Divisions (2)
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Number |
Date |
Country |
Parent |
526195 |
Aug 1983 |
|
Parent |
287539 |
Jun 1981 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
951690 |
Oct 1978 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
176815 |
Aug 1980 |
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