Device for hydraulic brake lock valve with a closing piston

Claim 1

A device for maintaining a hydraulic media in at least one wheel cylinder of a vehicle hydraulic brake system, thereby locking the wheel, comprising: a housing having a cavity formed therein, an input channel formed therethrough in fluid communication with said cavity and adapted to be in fluid communication with a master cylinder of the brake system, and an output channel formed therethrough communicating with said cavity and adapted to be in fluid communication with said at least one vehicle wheel cylinder; a hollow seat member being releasably secured in an external end of said cavity; valve means being received in said cavity for controlling a flow of hydraulic fluid from said output channel to said input channel, said valve means comprising: (a) a sleeve adapted to be received in said cavity and having at least one hole extending from within said sleeve through the periphery thereof, a hole formed in a first end thereof, and a pair of peripheral flanges formed, in a spaced relationship about a second end thereof, said flanges being adapted to secure said sleeve within said cavity; (b) a seal extending about said sleeve between said flanges, (c) piston means slidably received in the hole formed in the first end of said sleeve, said piston means including a conical portion adjacent one end thereof, (d) sealing means, mounted within said sleeve, for creating a seal between the conical portion of said piston means and said sleeve, said sealing means conforming to the inner geometry of said sleeve, and (e) spring means acting between said piston means and said cavity for biasing said conical portion into engagement with said sealing means; transmission means including a seal member and a rod rotatably received within said seat member, said rod including a threaded end portion and at least one pair of flanges formed around an outer periphery thereof, said seal member being disposed between said pair of flanges and extending between said rod and said seat member; means for coupling said valve means and said transmission means, said coupling means being mounted within said seat member and comprising an internally threaded tubular element for threadably receiving the threaded end portion of said rod, said transmission and coupling means being arranged such that rotation of said rod in a predetermined direction results in shifting of said piston means against the biasing force of said spring means such that the conical portion of said piston means becomes disengaged from said sealing means and rotation of said rod in an opposite direction results in shifting of said piston means such that the conical portion is seated against said sealing means; means for rotatably driving said transmission means; and control means being linked to said driving means for activating said driving means in response to receiving a predetermined code signal; whereby under normal conditions the conical portion of said piston means is disengaged from said sealing means such that a hydraulic media is permitted to flow from said input channel to said output channel and vice versa, and when said driving means is activated by said control circuit to rotate said transmission means, said piston means is shifted, through the threaded connection between said rod and said coupling means, until the conical portion of said piston means is seated against said sealing means, at which time, said control circuit deactivates said driving means, hydraulic media is permitted to flow from said input channel to said output channel under pressure by shifting said piston means against the biasing force of said spring means so as to disengage the conical portion of said piston means from said sealing means but is prevented from flowing from said output channel to said input channel.

Claim 2

A device for maintaining a hydraulic media in at least one wheel cylinder of a vehicle hydraulic brake system, thereby locking the wheel, comprising: a housing having a cavity formed therein, an input channel formed therethrough in fluid communication with said cavity and adapted to be in fluid communication with a master cylinder of the brake system, and an output channel formed therethrough communicating with said cavity and adapted to be in fluid communication with said at least one vehicle wheel cylinder; a hollow seat member being releasably secured in an external end of said cavity; valve means being received in said cavity for controlling a flow of hydraulic fluid from said output channel to said input channel, said valve means comprising: (a) a sleeve adapted to be received in said cavity and having at least one hole extending from within said sleeve through the periphery thereof, a hole formed in a first end thereof, and a pair of peripheral flanges formed, in a spaced relationship about a second end thereof, said flanges being adapted to secure said sleeve within said cavity; (b) a seal extending about said sleeve between said flanges, (c) piston means slidably received in the hole formed in the first end of said sleeve, said piston means including a conical portion adjacent one end thereof, (d) sealing means, mounted within said sleeve, for creating a seal between the conical portion of said piston means and said sleeve, said sealing means conforming to the inner geometry of said sleeve, and (e) spring means acting between said piston means and said cavity for biasing said conical portion into engagement with said sealing means; transmission means including a seal member and a rod rotatably received within said seat member, said rod including a threaded end portion and at least one pair of flanges formed around an outer periphery thereof, said seal member being disposed between said pair of flanges and extending between said rod and said seat member; means for coupling said valve means and said transmission means, said coupling means being mounted within said seat member and comprising an internally threaded tubular element for threadably receiving the threaded end portion of said rod, said transmission and coupling means being arranged such that rotation of said rod in a predetermined direction results in shifting of said piston means against the biasing force of said spring means such that the conical portion of said piston means becomes disengaged from said sealing means and rotation of said rod in an opposite direction results in shifting of said piston means such that the conical portion is seated against said sealing means; means for rotatably driving said transmission means; and control means being linked to said driving means for activating said driving means in response to receiving a predetermined code signal; whereby under normal conditions the conical portion of said piston means is disengaged from said sealing means such that a hydraulic media is permitted to flow from said input channel to said output channel and vice versa, and when said driving means is activated by said control circuit to rotate said transmission means, said piston means is shifted, through the threaded connection between said rod and said coupling means, until the conical portion of said piston means is seated against said sealing means, at which time, said control circuit deactivates said driving means, hydraulic media is permitted to flow from said input channel to said output channel under pressure by shifting said piston means against the biasing force of said spring means so as to disengage the conical portion of said piston means from said sealing means but is prevented from flowing from said output channel to said input channel.