US3603209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic brake booster
Assignee: Bendix Corp
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Filing: 1969-01-16
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Granted: 1971-09-07
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Expires: 1989-01-16
Abstract
Abstract A means to control the use of hydraulic pressure on a piston having a valve element with an adjustable pilot-type relief valve to permit limiting of maximum boost pressure and which is actuatable by a means linked also to the piston so that reduced travel is permitted for power operation and a predetermined mechanical advantage is available for manual actuation of said piston by simple follow through motion.
Inventors
- 👤 Stanley I Macduff
- 👤 Richard L Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:33
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/16; B60T13/161; B60T13/162; B60T11/00; B60T11/10; B60T11/103
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
181 words
In a brake booster: a housing defining a chamber therewithin; a piston slidable in said chamber; valve means for controlling fluid communication between a source of fluid pressure and said chamber for shifting said piston; operator-operated control means for operating said valve means; mechanism operably connecting the control means, the piston, the the valve means for opening the latter upon shifting of the control means; said mechanism including lever means extending between said piston and said valve means, first pivot means connecting said lever means to said piston, second pivot means connecting said lever means to said control means, and third pivot means connecting said lever means to said valve, said second pivot means being disposed between said first and third pivot means, thereby permitting said piston to move a proportionally greater distance than said control means moves when the latter is shifted and fluid is communicated to said chamber, but permitting the control means to move a distance equal to that traveled by the piston when the control means is shifted and a malfunction prevents fluid communication into said chamber.
Claim 2
Dependent Claim
181 words
In a brake booster: a housing defining a chamber therewithin; a piston slidable in said chamber; valve means for controlling fluid communication between a source of fluid pressure and said chamber for shifting said piston; operator-operated control means for operating said valve means; mechanism operably connecting the control means, the piston, the the valve means for opening the latter upon shifting of the control means; said mechanism including lever means extending between said piston and said valve means, first pivot means connecting said lever means to said piston, second pivot means connecting said lever means to said control means, and third pivot means connecting said lever means to said valve, said second pivot means being disposed between said first and third pivot means, thereby permitting said piston to move a proportionally greater distance than said control means moves when the latter is shifted and fluid is communicated to said chamber, but permitting the control means to move a distance equal to that traveled by the piston when the control means is shifted and a malfunction prevents fluid communication into said chamber.
Claim 3
Dependent Claim
28 words
The invention of claim 1: said mechanism including yieldable means operably coupling said control means to the lever means to permit relative movement therebetween when said malfunction occurs.
Claim 4
Dependent Claim
36 words
The invention of claim 2: said control means and saId piston being substantially coaxial to permit said control means to engage the end of the piston upon relative movement between the control means and the mechanism.
Claim 5
Dependent Claim
26 words
The invention of claim 1, and: a bracket extending from said piston; said first pivot means connecting one end of said lever means to said bracket.
Claim 6
Dependent Claim
151 words
In a brake booster: a housing defining a chamber therewithin; a piston slidable in said chamber; valve means for controlling fluid communication between a source of fluid pressure and said chamber for shifting said piston; and an operator-operated control means for operating said valve means; and mechanism operably connecting the control means, the piston and the valve means for opening the latter upon shifting of the control means; said mechanism including means yieldably coupling said control means to the mechanism for movement therewith when the booster operates normally, said mechanism permitting said control means to move a proportionally smaller distance than said piston shifts during said normal operation of the booster, said coupling means yielding to permit the control means to move relative to said mechanism when a malfunction prevents a fluid communication into said chamber, said control means thereafter traveling a distance substantially equal to that traveled by the piston.
Claim 7
Dependent Claim
151 words
In a brake booster: a housing defining a chamber therewithin; a piston slidable in said chamber; valve means for controlling fluid communication between a source of fluid pressure and said chamber for shifting said piston; and an operator-operated control means for operating said valve means; and mechanism operably connecting the control means, the piston and the valve means for opening the latter upon shifting of the control means; said mechanism including means yieldably coupling said control means to the mechanism for movement therewith when the booster operates normally, said mechanism permitting said control means to move a proportionally smaller distance than said piston shifts during said normal operation of the booster, said coupling means yielding to permit the control means to move relative to said mechanism when a malfunction prevents a fluid communication into said chamber, said control means thereafter traveling a distance substantially equal to that traveled by the piston.
Claim 8
Dependent Claim
36 words
The invention of claim 5: said control means and said piston being substantially coaxial to permit said control means to engage the end of the piston upon relative movement between the control means and the mechanism.
Claim 9
Dependent Claim
65 words
The invention of claim 5; and abutments means on said control means; said mechanism including a bracket carried by said piston, lever means pivotally connected to said bracket and to said valve means, a caging member slidable on said control means, means pivotally connecting the caging member to said lever means, and resilient means yieldably urging said caging member into engagement with said abutment means.
Claim 10
Dependent Claim
32 words
The invention of claim 7: said control means and said piston being substantially coaxial to permit said control means to engage the end of the piston upon yielding of the resilient means.
Claim 11
Dependent Claim
88 words
The invention of claim 5; and abutment means on said control means; said mechanism including a bracket carried by said piston, lever means, first pivot means connecting the bracket to the lever means, second pivot means connecting the lever means to the valve means, a caging member slidable on said control means, third pivot means pivotally connecting said caging member to said lever means at a point between said first and second pivot means, and resilient means yieldably urging said caging member into engagement with said abutment means.
Claim 12
Dependent Claim
140 words
A power boost comprising: a housing having a valve bore and another bore communicable via a control chamber, said housing having port means for said valve bore; valve means in said valve bore controlling communication of said port means and said control chamber; piston means in said another bore and controlled by fluid pressure in said control chamber; means to actuate said valve means and said piston means inclusive of a mechanism to reduce actuating efforts on said valve means relative to that possible for said piston means; and means to dampen movement of said valve means to prevent its overshooting the travel scheduled by said means to actuate said valve means including an orifice between the control chamber and a balancing chamber about said valve means whereby initial fluid pressure is unbalanced towards opposing movement of said valve means.
Claim 13
Dependent Claim
140 words
A power boost comprising: a housing having a valve bore and another bore communicable via a control chamber, said housing having port means for said valve bore; valve means in said valve bore controlling communication of said port means and said control chamber; piston means in said another bore and controlled by fluid pressure in said control chamber; means to actuate said valve means and said piston means inclusive of a mechanism to reduce actuating efforts on said valve means relative to that possible for said piston means; and means to dampen movement of said valve means to prevent its overshooting the travel scheduled by said means to actuate said valve means including an orifice between the control chamber and a balancing chamber about said valve means whereby initial fluid pressure is unbalanced towards opposing movement of said valve means.
Claim 14
Dependent Claim
32 words
The structure of claim 10 and further comprising a relief valve means for said balancing chamber to relieve control pressures above a predetermined value without increasing fluid flow via said control chamber.
Claim 15
Dependent Claim
22 words
The structure of claim 11 and further comprising means adjustable exteriorily of said housing for regulating the operation of said relief Valve.
Claim 16
Dependent Claim
86 words
A power boost means having a power valve for controlling a piston with means to limit control pressure thereon and having an actuation means characterized by the improvement of a lever mechanism; and operator-operated push rod; and a spring biased means caged to said push rod to operate said lever mechanism with reduced efforts as compared to that available to operate said piston upon abutment therewith of said push rod, said push rod being adapted to transmit feel of powered and nonpowered operation of said piston.
Claim 17
Dependent Claim
86 words
A power boost means having a power valve for controlling a piston with means to limit control pressure thereon and having an actuation means characterized by the improvement of a lever mechanism; and operator-operated push rod; and a spring biased means caged to said push rod to operate said lever mechanism with reduced efforts as compared to that available to operate said piston upon abutment therewith of said push rod, said push rod being adapted to transmit feel of powered and nonpowered operation of said piston.
Claim 18
Dependent Claim
168 words
A power boost comprising: a housing having a valve bore and another bore communicable via a control chamber, said housing having port means for said valve bore; valve means in said valve bore controlling communication of said port means and said control chamber; piston means in said another bore and controlled by fluid pressure in said control chamber; and means to actuate said valve means and said piston means inclusive of a mechanism to reduce actuating efforts on said valve means relative to that possible for said piston means; said means to actuate said valve means and said piston means including lever means pivoted to a bracket attached to said piston means within which a bracket of a caged spring assembly is slidable to first operate said valve means, via a fulcrum intermediate an attachment point and a valve operating end of said lever means, and thereafter abut said piston means to mechanically actuate same in absence of sufficient fluid pressure in said control chamber to resist same.
Claim 19
Dependent Claim
168 words
A power boost comprising: a housing having a valve bore and another bore communicable via a control chamber, said housing having port means for said valve bore; valve means in said valve bore controlling communication of said port means and said control chamber; piston means in said another bore and controlled by fluid pressure in said control chamber; and means to actuate said valve means and said piston means inclusive of a mechanism to reduce actuating efforts on said valve means relative to that possible for said piston means; said means to actuate said valve means and said piston means including lever means pivoted to a bracket attached to said piston means within which a bracket of a caged spring assembly is slidable to first operate said valve means, via a fulcrum intermediate an attachment point and a valve operating end of said lever means, and thereafter abut said piston means to mechanically actuate same in absence of sufficient fluid pressure in said control chamber to resist same.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |