US3901559A — Vehicle antiskid braking system

Claim 1

Independent Claim 322 words

A vehicle antiskid braking system comprising: a master cylinder in which a fluid pressure is exerted to apply thereof to the brakes; wheel braking cylinder means; conduit means to provide fluid connection between said master cylinder and said wheel braking cylinder means; skid sensing and computer means for producing a first signal indicating a need for a reduction of the brake actuation fluid pressure and a second signal indicating a need for an increase of the brake actuating fluid pressure within said wheel braking cylinder means; hydraulic pressure modulator means on said conduit means interposed between said master cylinder and said wheel braking cylinder means, including cut off valve means to cut off said fluid connection between said master cylinder and said wheel braking cylinder means in response to said first signal, pressure reducing means to increase total capacity of said conduit means between said pressure modulator means and said wheel braking cylinder means in response to said first signal thereby decreasing the brake actuating fluid pressure in said wheel braking cylinder means, and pressure increasing means to increase said brake actuating fluid pressure in said wheel braking cylinder means in response to said second signal by pumping fluid into said wheel braking cylinder means while said pressure reducing means being in its normal rest position; said pressure increasing means including; first electromagnetically operable valve means; a servomechanism; a pressure increasing piston and cylinder assembly; said first electromagnetically operable means being in fluid connection with said servomechanism to supply vacuum or atmosphere pressure to said servomechanism in response to said first or second signal and said pressure increasing piston and cylinder assembly being connected to said servomechanism so as to close said cut off valve means in response to said first signal while on the other hand function as a reciprocating pump in response to said second signal thereby the brake actuating fluid pressure is increased in said wheel brake cylinder means.

Claim 2

Dependent Claim 322 words

A vehicle antiskid braking system comprising: a master cylinder in which a fluid pressure is exerted to apply thereof to the brakes; wheel braking cylinder means; conduit means to provide fluid connection between said master cylinder and said wheel braking cylinder means; skid sensing and computer means for producing a first signal indicating a need for a reduction of the brake actuation fluid pressure and a second signal indicating a need for an increase of the brake actuating fluid pressure within said wheel braking cylinder means; hydraulic pressure modulator means on said conduit means interposed between said master cylinder and said wheel braking cylinder means, including cut off valve means to cut off said fluid connection between said master cylinder and said wheel braking cylinder means in response to said first signal, pressure reducing means to increase total capacity of said conduit means between said pressure modulator means and said wheel braking cylinder means in response to said first signal thereby decreasing the brake actuating fluid pressure in said wheel braking cylinder means, and pressure increasing means to increase said brake actuating fluid pressure in said wheel braking cylinder means in response to said second signal by pumping fluid into said wheel braking cylinder means while said pressure reducing means being in its normal rest position; said pressure increasing means including; first electromagnetically operable valve means; a servomechanism; a pressure increasing piston and cylinder assembly; said first electromagnetically operable means being in fluid connection with said servomechanism to supply vacuum or atmosphere pressure to said servomechanism in response to said first or second signal and said pressure increasing piston and cylinder assembly being connected to said servomechanism so as to close said cut off valve means in response to said first signal while on the other hand function as a reciprocating pump in response to said second signal thereby the brake actuating fluid pressure is increased in said wheel brake cylinder means.

Claim 3

Dependent Claim 62 words

The vehicle antiskid braking system, as recited in claim 1, wherein said servomechanism includes; case; a diaphragm power wall dividing said case into a first and second chambers and is connected to said pressure increasing piston; said first chamber being in fluid connection with said first electromagnetically operable valve means and said second chamber being in fluid connection with said vacuum source.

Claim 4

Dependent Claim 78 words

The vehicle antiskid braking system, as recited in claim 2, wherein said first electromagnetically operable valve means normally permits to supply vacuum therethrough to said first chamber while permits to supply atmospheric pressure to said first chamber in response to said first signal so that a pressure differential is produced between both sides of said power wall to thereby move said diaphragm whereby said pressure increasing piston is moved by said wall to close said cut off valve.

Claim 5

Dependent Claim 97 words

The vehicle antiskid braking system as recited in claim 3, wherein said first electromagnetically operable means permits to alternately supply vacuum and atmosphere to said first chamber in response to said second siGnal to thereby reciprocate said diaphragm power wall and then in turn said pressure increasing piston for increasing the brake actuating fluid pressure in said wheel brake cylinder means, and is provided with means to ensure one of the stroke ends of said pressure increasing piston at an accurate fixed position to hold said cut off valve means in its seated position during said reciprocation.

Claim 6

Dependent Claim 79 words

The vehicle antiskid braking system, as recited in claim 3, wherein said pressure reduction means includes a second electromagnetically operable valve means operable in response to said first signal and a pressure reducing piston and cylinder assembly drivenly connected to said second electromagnetically operable valve means to expand the volume of inner space of said cylinder means for permitting pressure fluid to escape from the wheel braking cylinder means and thereby reducing the brake actuating pressure at the wheels.

Claim 7

Dependent Claim 66 words

The vehicle antiskid braking system, as recited in claim 3, wherein said diaphragm power wall is provided with a reed switch, said reed switch functions to ensure reciprocation of the wall and one terminal end of stroke of said pressure increasing piston at an accurate position just prior to said cut off valve means to hold thereof in the seated position until said second signal ceases.

Claim 8

Dependent Claim 42 words

The vehicle antiskid braking system, as recited in claim 6, wherein said reed switch is electrically connected to said second electromagnetically operable valve means to permit fluid connection between said first chamber and siad atmosphere in timed relation with said second signal.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-08-25	1979-02-24	1979-08-26	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-08-25	1983-02-24	1983-08-26	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-08-25	1987-02-24	1987-08-26	$7700.00	Window Closed / Lapsed

Vehicle antiskid braking system

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