|
PatentVote.com: Vote on your favourite invention!
|
|
 |
Title: Anti-skid device including a gear-driven cam pumping unit with fail-safe features
Claims: I claim: 1. An anti-skid device for controlling the braking of a wheel comprising, a master brake cylinder, a pressure-sensitive valve means connected to said master brake cylinder, a valve and piston means having an inlet means and an outlet means, said inlet means connected to said pressure-sensitive valve means, a brake cylinder connected to said wheel, said outlet means connected to said brake cylinder, a cam means driven by said wheel operating said valve and piston means, to impart a pumping action to said brake cylinder when the pressure exerted by said master cylinder on said pressure-sensitive valve exceeds a predetermined valve, and, a gear means driven by said wheel, said gear means in turn driving said cam means. 2. The device of claim 1 further including a spring means, said spring means situated to bias said cam means against said gear means. 3. The device of claim 1 wherein said cam means further includes a one-way clutch for allowing rotation only in one direction. 4. An anti-skid device for controlling the braking of a wheel comprising, a master brake cylinder, a pressure-sensitive valve means connected to said master brake cylinder, a valve and piston means having an inlet means and an outlet means, said inlet means connected to said pressure-sensitive valve means, a brake cylinder connected to said wheel, said outlet means connected to said brake cylinder; a cam means driven by said wheel operating said valve and piston means, to impart a pumping action to said brake cylinder when the pressure exerted by said master cylinder on said pressure-sensitive valve exceeds a predetermined value, said pressure sensitive valve means including two outlet ports connected to said inlet means and wherein only one of said outlet ports is opened when the braking pressure exceeds said predetermined value, and a first fail-safe device for opening both of said two outlet ports if said pressure-sensitive valve means fails. 5. The device of claim 4 wherein said first fail-safe device includes, a valve stem within said pressure-sensitive valve means, a ball seated in a recess at one end of said valve stem, a plate with a recessed center for receiving said ball, and a spring for biasing said plate against said ball, wherein said ball will fall off the end of said valve stem if said spring fails. 6. The device of claim 4 and including a second fail-safe device for allowing brake fluid to reach the cylinder if said cam means fails. 7. The device of claim 4 wherein said second fail safe device comprises a cam-operated valve including an upper and lower chamber on either side of said second piston means, and a second piston means facing said lower chamber, said upper chamber having an exit port to said brake cylinder and in inlet port connected to an outlet port of said pressure-sensitive valve means and said lower chamber connected to a second outlet port of said pressure-sensitive valve means, said exit port means of said cam-operated valve remaining open when the pressure in said upper chamber is approximately equal to the pressure in said lower chamber. 8. An anti-skid device for controlling the braking of a wheel comprising, a master brake cylinder, a pressure-sensitive valve means connected to said master brake cylinder, a valve and piston means having an inlet means and an outlet means, said inlet means connected to said pressure-sensitive valve means, a brake cylinder connected to said wheel, said outlet means connected to said brake cylinder, and a cam means driven by said wheel operating said valve and piston means, to impart a pumping action to said brake cylinder when the pressure exerted by said master cylinder on said pressure-sensitive valve exceeds a predetermined value, said pressure-sensitive valve means including two outlet ports connected to said inlet means and wherein only one of said outlet ports is opened when the braking pressure exceeds said predetermined value, wherein said valve and piston means includes a plurality of elements including at least one valve and at least one piston, said one valve closing when the braking pressure on said pressure-sensitive valve means exceeds said predetermined value whereupon said piston imparts said pumping action to said hydraulic brake means. Other info: Inventors: Stage, Jack W. (San Rafael, CA, US) Application Number: 368429 Filing Date: 1973-06-08 Publication_date: 1976-04-20 Assignee: Primary Class(es): 303/116.3 74/13, 188/181A, 188/DIG1, 303/10, 303/61 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Reger, Duane A. Assistant Examiner: Butler, Douglas C. Attorney: Dyson; Edward E., Byrne; John J. |
|