Control apparatus for two power brakes

Claim 2

Control apparatus for two power brakes, comprising a housing; first valve means in said housing including a reaction means operable by an operator between normal and braking positions in which said first valve means connects a first variable pressure chamber in said housing with low pressure fluid and high pressure fluid, respectively, said first chamber being adapted to communicate with a first brake; second valve means including piston means movable in said housing between normal and braking positions in which said second valve means connects a second variable pressure chamber in said housing with low pressure fluid and high pressure fluid, respectively, said second chamber being adapted to communicate with a second brake, said first and second variable pressure chambers being located on opposite sides of said piston means so that high pressure in said first variable pressure chamber moves said piston means to said braking position in which high pressure fluid enters said second variable pressure chamber and balances the pressure in said first variable pressure chamber; first force transmitting means connecting said reaction means with said second valve means so that in the event that no high pressure is produced in said first variable pressure chamber, said force transmitting means are operated by said reaction means to actuate said second valve means to connect said second variable pressure chamber with high pressure fluid so that the high pressure in said second variable pressure chamber displaces said piston means into said first variable pressure chamber; and second force transmitting means connecting said piston means with said first force transmitting means so that the pressure acting on said piston means and second brake is indicated to the operator by the pressure transmitted from said piston means to said reaction means, said second force transmitting means including lever means mounted in said housing and engaging said piston means and said first force transmitting means so that displacement of said piston means by high pressure fluid in said second variable pressure chamber is transmitted from said piston means through said lever means to said first force transmitting means and by said first force transmitting means to said reaction means.

Claim 3

Apparatus as claimed in claim 1 wherein said first force transmitting means include lost motion means and a force transmitting member operatively connecting said reaction means with said second valve means.

Claim 4

Control apparatus for two power brakes comprising a housing; first valve means in said housing including a reaction means operable by and operator between normal and braking positions in which said first valve means connects a first variable pressure chamber in said housing with low pressure fluid and high pressure fluid, respectively, said first chamber being adapted to communicate with a first brake; second valve means including piston means movable in said housing between normal and braking positions in which said second valve means connects a second variable pressure chamber in which said housing with low pressure fluid and high pressure fluid, respectively, said second chamber being adapted to communicate with a second brake, said first and second variable pressure chambers being located on opposite sides of said piston means so that high pressure in said first variable pressure chamber moves said piston means to said braking position in which high pressure fluid enters said second variable pressure chamber and balances the pressure in said first variable pressure chamber; first force transmitting means connecting said reaction means with said second valve means so that in the event that no high pressure is produced in said first variable pressure chamber, said force transmitting means are operated by said reaction means to actuate said second valve means to connect said second variable pressure chamber with high pressure fluid so that the high pressure in said second variable pressure chamber displaces said piston means into said first variable pressure chamber, said first force transmitting means including a stem operatively connecting said reaction means with said second valve means and having an abutment; and second force transmitting means connecting said piston means with said first force transmitting means so that the pressure acting on said piston means and second brake is indicated to the operator by the pressure transmitted from said piston means to said reaction means, said second force transmitting means including a plurality of levers mounted in said housing for angular movement and engaging piston means and said abutment so that displacement of said piston means by high pressure in said second variable pressure chamber is transmitted by said levers to said stem and by the same to said reaction means.

Claim 5

Control apparatus for two power brakes comprising a housing; first valve means in said housing including a reaction means operable by and operator between normal and braking positions in which said first valve means connects a first variable pressure chamber in said housing with low pressure fluid and high pressure fluid, respectively, said first chamber being adapted to communicate with a first brake; second valve means including piston means movable in said housing between normal and braking positions in which said second valve means connects a second variable pressure chamber in which said housing with low pressure fluid and high pressure fluid, respectively, said second chamber being adapted to communicate with a second brake, said first and second variable pressure chambers being located on opposite sides of said piston means so that high pressure in said first variable pressure chamber moves said piston means to said braking position in which high pressure fluid enters said second variable pressure chamber and balances the pressure in said first variable pressure chamber; first force transmitting means connecting said reaction means with said second valve means so that in the event that no high pressure is produced in said first variable pressure chamber, said force transmitting means are operated by said reaction means to actuate said second valve means to connect said second variable pressure chamber with high pressure fluid so that the high pressure in said second variable pressure chamber displaces said piston means into said first variable pressure chamber, said first force transmitting means including a stem operatively connecting said reaction means with said second valve means and having an abutment; and second force transmitting means connecting said piston means with said first force transmitting means so that the pressure acting on said piston means and second brake is indicated to the operator by the pressure transmitted from said piston means to said reaction means, said second force transmitting means including a plurality of levers mounted in said housing for angular movement and engaging piston means and said abutment so that displacement of said piston means by high pressure in said second variable pressure chamber is transmitted by said levers to said stem and by the same to said reaction means.

Claim 6

Apparatus as claimed in claim 3 wherein said piston means has a central opening through which said stem passes for movement relative to said piston means.

Claim 7

Apparatus as claimed in claim 3 wherein said stem is hollow for supplying low pressure fluid to said first variable pressure chamber, and has an annular valve seat; wherein said second valve includes a spring biased valve member mounted in said housing and operated by said valve seat when said stem is operated by said reaction means so that high pressure fluid is connected with said second variable pressure chamber.

Claim 8

Apparatus as claimed in claim 3 wherein said piston means has a central opening through which said stem passes for movement relative to said piston means; wherein said abutment includes a flange surrounding said stem; and wherein said lever means are angularly spaced about said stem and have radially inner ends abutting said flange, and radially outer fulcrum ends abutting said housing, and portions intermediate said inner and outer ends abutting said piston means.

Claim 9

Apparatus as claimed in claim 6 wherein said lever means are located in said first variable pressure chamber.

Claim 10

Apparatus as claimed in claim 6 wherein said flange is movably mounted on said stem; wherein said stem has an annular shoulder; and wherein said force transmitting means include a spring means urging said inner ends of said lever means into abutment with said flange so that said movable flange is pressed against said shoulder.

Claim 11

Apparatus as claimed in claim 6 wherein said reaction means includes a piston having an outer periphery in sealing contact with said housing; wherein said first variable pressure chamber is located between said piston and said piston means; and wherein said lever means are located in said first variable pressure chamber.

Claim 12

Apparatus as claimed in claim 3 wherein said reaction means has a central closed bore into which said stem projects, spaced from the closed end of said bore in said normal position of said reaction means so that motion is lost and said second valve means is not operated by said stem to connect said second variable pressure chamber with high pressure fluid during movement of said reaction means to said braking position thereof and during consequent movement of said piston means to said braking position thereof; and wherein said stem is engaged by the closed end of said bore, and displaced by said reaction means when said piston means is not moved to said braking position so that the displaced stem operates said second valve means to connect said second variabLe pressure chamber with high pressure fluid.