Control valve

Claim 2

A fluid pressure system for a friction device comprising first means responsive to a first fluid pressure applied thereto for energizing said friction device, second means responsive to a second fluid pressure applied thereto less than a predetermined value for energizing said friction device, resiliently urged means for controlling the application of the second fluid pressure to said second means, said resiliently urged means being responsive to the second fluid pressure less than the predetermined value to vent the second fluid pressure applied to said second means to atmosphere and actuate said second means, fourth means for venting the second fluid pressure applied to said second means to the atmosphere to effect actuation of said second means, and fifth means for normally applying fluid pressure to said first means and for subjecting said fourth means to an applied force to effect actuation thereof in the event of a failure of one of said first and second fluid pressures.

Claim 3

A fluid pressure system for a friction device comprising a pair of fluid pressure sources, first means responsive to fluid pressure applied thereto from one of said sources for energizing said friction device, second means responsive to fluid pressure applied thereto less than a predetermined value from the other of said sources for energizing said friction device, resiliently urged means for controlling the application of the fluid pressure from said other source to said second means, said resiliently urged means being movable toward a venting position in response to the reduction of the fluid pressure at said other source to a value less than the predetermined value to vent the fluid pressure applied to said second means to the atmosphere and effect actuation of said second means to energize said friction device, fourth means movable toward a venting position in response to an applied force thereon for venting the fluid pressure applied to said second means to the atmosphere to effect actuation of said second means and energize said friction device upon the failure of the fluid pressure at one of said one and other sources, and valve means controlling communication between the fluid pressure applied to said second means and the atmosphere, said valve means being actuated by said resiliently urged means and said fourth means upon movement thereof to their respective venting positions to vent the fluid pressure applied to said second means to the atmosphere.

Claim 4

A fluid pressure system for a friction device comprising a pair of fluid pressure sources, first means responsive to fluid pressure applied thereto from one of said sources for energizing said friction device, second means responsive to fluid pressure applied thereto less than a predetermined value from the other of said sources for energizing said friction device, resiliently urged means for controlling the application of the fluid pressure from said other source to said second means, said resiliently urged means being movable toward a venting position in response to the reduction of the fluid pressure at said other source to a value less than the predetermined value to vent the fluid pressure applied to said second means to the atmosphere and effect actuation of said second means to energize said friction device, fourth means movable toward a venting position in response to an applied force thereon for venting the fluid pressure applied to said second means to the atmosphere to effect actuation of said second means and energize said friction device upon the failure of the fluid pressure at one of said one and other sources, and valve means controlling communication between the fluid pressure applied to said second means and the atmosphere, said valve means being actuated by said resiliently urged means and said fourth means upon movement thereof to their respective venting positions to vent the fluid pressure applied to said second means to the atmosphere.

Claim 5

A fluid pressure system for effecting normal and mechanical energization of a friction device comprising a pair of fluid pressure sources, a fluid pressure responsive motor actuated in response to fluid pressure applied thereto from one of said sources to effect normal energization of said friction device, a resiliently urged motor actuated in response to fluid pressure applied thereto less than a predetermined value from the other of said sources to effect the mechanical energization of said friction device, means movable in response to an applied force for applying fluid pressure from said one source to said fluid pressure responsive motor to effect actuation thereof and the normal energization of said friction device, other means responsive to the applied force movement of said first named means in excess of a predetermined value to isolate said other fluid pressure source and vent the applied fluid pressure from said resiliently urged motor to the atmosphere, said resiliently uRged motor being actuated upon the reduction of the fluid pressure applied thereto to a value less than the predetermined value to mechanically energize said friction device, and resiliently urged means urged toward a position in response to the fluid pressure at said other source in excess of the predetermined value to permit communication between said other source and resiliently urged motor, said resiliently urged means being movable to interrupt communication between said other source and said resiliently urged motor and vent the applied fluid pressure from said resiliently urged motor to the atmosphere to effect actuation thereof and the mechanical energization of said friction device upon the reduction of the fluid pressure at said other source to a value less than the predetermined value.

Claim 6

A fluid pressure system for effecting normal and mechanical energization of a friction device comprising a pair of fluid pressure sources, a fluid pressure responsive motor actuated in response to fluid pressure applied thereto from one of said sources to effect normal energization of said friction device, a resiliently urged motor actuated in response to fluid pressure applied thereto less than a predetermined value from the other of said sources to effect the mechanical energization of said friction device, means movable in response to an applied force for applying fluid pressure from said one source to said fluid pressure responsive motor to effect actuation thereof and the normal energization of said friction device, other means responsive to the applied force movement of said first named means in excess of a predetermined value to isolate said other fluid pressure source and vent the applied fluid pressure from said resiliently urged motor to the atmosphere, said resiliently uRged motor being actuated upon the reduction of the fluid pressure applied thereto to a value less than the predetermined value to mechanically energize said friction device, and resiliently urged means urged toward a position in response to the fluid pressure at said other source in excess of the predetermined value to permit communication between said other source and resiliently urged motor, said resiliently urged means being movable to interrupt communication between said other source and said resiliently urged motor and vent the applied fluid pressure from said resiliently urged motor to the atmosphere to effect actuation thereof and the mechanical energization of said friction device upon the reduction of the fluid pressure at said other source to a value less than the predetermined value.

Claim 7

A fluid pressure system for energizing a friction device comprising a fluid pressure source, a resiliently urged motor actuated in response to fluid pressure applied thereto less than a predetermined value from said source to effect energization of said friction device, movable means for controlling the application of fluid pressure from said source to said resiliently urged motor, said movable means being movable in response to an applied force toward a venting position to isolate said source and vent the applied fluid pressure from said resiliently urged motor to the atmosphere, said resiliently urged motor being actuated upon the reduction of the applied fluid pressure to a value less than the predetermined value to energize said friction device, resiliently urged means for controlling pressure fluid communication between said source and said resiliently urged motor and normally urged toward a position establishing pressure fluid communication between said source and said resiliently urged motor in response to fluid pressure at said source in excess of the predetermined value, said resiliently urged means being movable toward a venting position to isolate said source and vent the applied fluid pressure from said resiliently urged motor to the atmosphere to actuate said resiliently urged motor and energize said friction device in the event of the reduction of the fluid pressure at said source to a value less than the predetermined value, and value means urged toward a closed position isolating the fluid pressure applied to said resiliently urged motor from the atmosphere, said valve means being actuated by said resiliently urged means and said movable means to an open position venting the fluid pressure applied to said resiliently urged motor to the atmosphere upon the movement of said resiliently urged means and said movable means to their venting positions, respectively.

Claim 8

A fluid pressure system for energizing a friction device comprising a fluid pressure source, a resiliently urged motor actuated in response to fluid pressure applied thereto less than a predetermined value from said source to effect energization of said friction device, movable means for controlling the application of fluid pressure from said source to said resiliently urged motor, said movable means being movable in response to an applied force toward a venting position to isolate said source and vent the applied fluid pressure from said resiliently urged motor to the atmosphere, said resiliently urged motor being actuated upon the reduction of the applied fluid pressure to a value less than the predetermined value to energize said friction device, resiliently urged means for controlling pressure fluid communication between said source and said resiliently urged motor and normally urged toward a position establishing pressure fluid communication between said source and said resiliently urged motor in response to fluid pressure at said source in excess of the predetermined value, said resiliently urged means being movable toward a venting position to isolate said source and vent the applied fluid pressure from said resiliently urged motor to the atmosphere to actuate said resiliently urged motor and energize said friction device in the event of the reduction of the fluid pressure at said source to a value less than the predetermined value, and value means urged toward a closed position isolating the fluid pressure applied to said resiliently urged motor from the atmosphere, said valve means being actuated by said resiliently urged means and said movable means to an open position venting the fluid pressure applied to said resiliently urged motor to the atmosphere upon the movement of said resiliently urged means and said movable means to their venting positions, respectively.

Claim 9

A fluid pressure system for energizing a friction device comprising a fluid pressure source, a resiliently urged motor actuated in response to fluid pressure applied thereto less than a predetermined value from said source to effect energization of said friction device, and control means including a housing having a pressure fluid flow passage therein connected between said source and said resiliently urged motor, a pair of application means movable in said housing and controlling the application of fluid pressure through said flow passage, one of said application means being normally urged toward a position in said flow passage permitting the application therethrough of the fluid pressure from said source to said resiliently urged motor in response to fluid pressure at said source in excess of a predetermined value acting on said one application means, and resilient means opposing movement of said one application means to its flow passing position, said resilient means urging said one application means toward another position in said flow passage isolating said source from said resiliently urged motor and venting the applied fluid pressure therefrom to the atmosphere to actuate said resiliently urged motor and energize said friction device when the fluid pressure at said source acting on said one appLication means is reduced to a value less than the predetermined value, the other of said application means being movable in response to an applied force toward a position in said flow passage isolating said source from said resiliently urged motor and venting the applied fluid pressure therefrom to the atmosphere to actuate said resiliently urged motor and energize said friction device only when said one application means is in its fluid pressure passing position, and means for subjecting said other application means to the applied force to effect actuation thereof.

Claim 10

A fluid pressure system for energizing a friction device comprising a fluid pressure source, a resiliently urged motor actuated in response to fluid pressure applied thereto less than a predetermined value from said source to effect energization of said friction device, and control means including a housing having a pressure fluid flow passage therein connected between said source and said resiliently urged motor, a pair of application means movable in said housing and controlling the application of fluid pressure through said flow passage, one of said application means being normally urged toward a position in said flow passage permitting the application therethrough of the fluid pressure from said source to said resiliently urged motor in response to fluid pressure at said source in excess of a predetermined value acting on said one application means, and resilient means opposing movement of said one application means to its flow passing position, said resilient means urging said one application means toward another position in said flow passage isolating said source from said resiliently urged motor and venting the applied fluid pressure therefrom to the atmosphere to actuate said resiliently urged motor and energize said friction device when the fluid pressure at said source acting on said one appLication means is reduced to a value less than the predetermined value, the other of said application means being movable in response to an applied force toward a position in said flow passage isolating said source from said resiliently urged motor and venting the applied fluid pressure therefrom to the atmosphere to actuate said resiliently urged motor and energize said friction device only when said one application means is in its fluid pressure passing position, and means for subjecting said other application means to the applied force to effect actuation thereof.

Claim 11

A fluid pressure system for energizing a friction device comprising a pair of fluid pressure sources, a fluid pressure responsive motor for energizing said friction device, means movable in response to an applied force for normally applying fluid pressure from one of said sources to said motor to effect energization of said friction device, a resiliently urged motor actuated in response to fluid pressure applied thereto less than a predetermined value from the other of said sources for energizing said friction device, control means including a pair of relatively movable application means for controlling the application of fluid pressure from said other source to said resiliently urged motor, said application means each being respectively movable relative to each other from their respective inoperative positions toward their operative positions to isolate the fluid pressure at said other source from the fluid pressure applied to said resiliently urged motor and vent the applied fluid pressure from said resiliently urged motor to the atmosphere, one of said application means being automatically actuated toward its operative position when the fluid pressure at said other source acting thereon is less than the predetermined value, and other means responsive to the movement of said first named means in excess of a predetermined amount for transmitting the applied force from said first named means to the other of said application means to effect movement thereof into its operative position when said one application means is in its inoperative position.

Claim 12

A fluid pressure system for energizing a friction device comprising a pair of fluid pressure sources, a fluid pressure responsive motor for energizing said friction device, means movable in response to an applied force for normally applying fluid pressure from one of said sources to said motor to effect energization of said friction device, a resiliently urged motor actuated in response to fluid pressure applied thereto less than a predetermined value from the other of said sources for energizing said friction device, control means including a pair of relatively movable application means for controlling the application of fluid pressure from said other source to said resiliently urged motor, said application means each being respectively movable relative to each other from their respective inoperative positions toward their operative positions to isolate the fluid pressure at said other source from the fluid pressure applied to said resiliently urged motor and vent the applied fluid pressure from said resiliently urged motor to the atmosphere, one of said application means being automatically actuated toward its operative position when the fluid pressure at said other source acting thereon is less than the predetermined value, and other means responsive to the movement of said first named means in excess of a predetermined amount for transmitting the applied force from said first named means to the other of said application means to effect movement thereof into its operative position when said one application means is in its inoperative position.

Claim 13

A fluid pressure system according to claim 6, wherein said one application means includes resiliently urged means, said resiliently urged means being urged against its own force toward its inoperative position in response to the fluid pressure in excess of the predetermined value at said other source acting thereon and being movable by its own force to its operative position upon the reduction of the fluid pressure at said other source to a value less than the predetermined value.

Claim 14

A fluid pressure system according to claim 7, comprising an area on said resiliently urged means subjected to the fluid pressure at said other source, said resiliently urged means being movable against its own force to its inoperative position in response to the fluid pressure in excess of the predetermined value at said other source acting on said area and being movable by its own force to its operative position upon the reduction of the fluid pressure at said other source acting on said area to a value less than the predetermined value.

Claim 15

A fluid pressure system according to claim 7, comprising valve means movable in said resiliently urged means for engagement with said other application means and controlling pressure fluid communication between said other source and resiliently urged motor and between said resiliently urged motor and the atmosphere, said other application means being movable in response to the applied force thereon to its operative position to engage and move said valve means toward a position interrupting pressure fluid communication between said other source and said resiliently urged motor and establishing pressure fluid communication between said resiliently urged motor and the atmosphere when said resiliently urged means is in its operative position, and said resiliently urged means being initially movable toward its operative position to engage said valVe means with said other application means interrupting pressure fluid communication between said other source and said resiliently urged motor and thereafter further movable relative to said valve means to establish communication between said resiliently urged motor and the atmosphere.

Claim 16

A fluid pressure system according to claim 9, comprising a valve seat in said other application means for engagement with said valve means, said valve seat being engaged with said valve means to interrupt pressure fluid communication between said other source and said resiliently urged motor.

Claim 17

A fluid pressure system according to claim 9, comprising a valve seat on said resiliently urged means, said valve means being normally urged into engagement with valve seat to interrupt communication between said resiliently urged motor and the atmosphere, and said valve means being disengaged from said valve seat to establish communication between said resiliently urged motor and the atmosphere upon upon the applied force movement of said other application means to its operative position and upon the movement of said resiliently urged means to its operative position.