US3724910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cam operated control
Assignee: Bendix Corp
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Filing: 1971-09-29
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Granted: 1973-04-03
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Expires: 1991-09-29
Abstract
Abstract A control for positively regulating the alternate flow of partial vacuum from a source of air at atmospheric pressure to operate a pressure differential pump.
Inventors
- 👤 L Rossigno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:36
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60T11/00; B60T11/10; B60T11/24; B60T13/00; B60T13/10; B60T13/12; B60T13/22; B60T13/24; B60T13/46; B60T13/52
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
336 words
In a power braking system, control means for positively regulating the alternate communication of vacuum and air at atmospheric pressure to a movable wall to operate a pump supplying pressurized fluid through a conduit to a manually actuated valve connected to a spring parking brake, said control means comprising: a housing having an internal chamber with a first inlet port connected to a source of vacuum, a second inlet port connected to air at atmospheric pressure, and a communication port connected to said movable wall; a push rod member connected to said movable wall and extending through said housing into said internal chamber; first pivot pin means secured to said housing perpendicular to said push rod member; caging means having one end fixed to said pivot pin means and the other end fixed to a connecting pin on said push rod for retaining a first resilient member; actuation means retained in said housing having an end with a slot therein, said slot surrounding said connecting pin; first valve means adapted to be biased against said first inlet port through said actuation means by said caging means for controlling the communication of said source of vacuum to said internal chamber; and second valve means adapted to be alternately biased with said first valve means against said second inlet port through said actuation means by said caging means for controlling the communication of said air at atmospheric pressure to said internal chamber, said actuation means engaging said first valve means in response to said resilient member expanding and moving to permit vacuum communication with said internal chamber only during a first directional position of said movable wall and engaging said second valve means in response to said resilient member expanding and moving said actuation means to allow air at atmospheric pressure communication with said internal chamber only during a second directional position of said movable wall, said first and second directional position being diametrically opposed to permit an operational pressure differential to be created across said wall means.
Claim 2
Dependent Claim
336 words
In a power braking system, control means for positively regulating the alternate communication of vacuum and air at atmospheric pressure to a movable wall to operate a pump supplying pressurized fluid through a conduit to a manually actuated valve connected to a spring parking brake, said control means comprising: a housing having an internal chamber with a first inlet port connected to a source of vacuum, a second inlet port connected to air at atmospheric pressure, and a communication port connected to said movable wall; a push rod member connected to said movable wall and extending through said housing into said internal chamber; first pivot pin means secured to said housing perpendicular to said push rod member; caging means having one end fixed to said pivot pin means and the other end fixed to a connecting pin on said push rod for retaining a first resilient member; actuation means retained in said housing having an end with a slot therein, said slot surrounding said connecting pin; first valve means adapted to be biased against said first inlet port through said actuation means by said caging means for controlling the communication of said source of vacuum to said internal chamber; and second valve means adapted to be alternately biased with said first valve means against said second inlet port through said actuation means by said caging means for controlling the communication of said air at atmospheric pressure to said internal chamber, said actuation means engaging said first valve means in response to said resilient member expanding and moving to permit vacuum communication with said internal chamber only during a first directional position of said movable wall and engaging said second valve means in response to said resilient member expanding and moving said actuation means to allow air at atmospheric pressure communication with said internal chamber only during a second directional position of said movable wall, said first and second directional position being diametrically opposed to permit an operational pressure differential to be created across said wall means.
Claim 3
Dependent Claim
90 words
The power braking system, as recited in claim 1 wherein said actuation means includes: second pivot pin means secured to said housing perpendicular to said push rod member directly opposite said first pivot pin means; and lever arm means having one end fixed to said second pivot pin means and the other end having said slot therein secured by said connecting pin to said push rod member, said lever arm means having a first cam surface and a second cam surface for operatively engaging said first and second valve means.
Claim 4
Dependent Claim
210 words
The power braking system, as recited in claim 2 wherein said caging means includes: a first retainer member having an annular portion with an eye on one side and a tubular section on the other side, said eye being fixed to said retaining pin on said push rod member; and a second retainer member having an annular portion with an eye on one side and a stem on the other side, said eye of the second retainer member being fixed to said second pivot pin and said stem being retained in said tubular section, said first resilient means being held between said first and second retainer members, said stem moving in said tubular member to permit said first resilient means to collapse and allow said connecting pin on said push rod to correspondingly move past an in line position point with said first and second pivot pins to initiate the first and second directional position change in said movable wall, said first and second cam surfaces momentarily maintaining their respective engagements with the first and second valve means until said connecting pin has passed said in-line position point to reduce the possibility of both the first and second valve means being closed by a stall condition in said wall means.
Claim 5
Dependent Claim
125 words
The power brake system, as recited in claim 3 wherein said first valve means includes: a first shaft retained in a guide surface in said housing; a first flexible face member attached to said first shaft; and first spring means surrounding said first shaft for urging said flexible face into a seating position on the housing surrounding said first inlet port to preclude communication of vacuum through said first inlet port during said second direction position of said wall means, said first cam surface acting on said first shaft in response to expansion of said first resilient means to overcome said first spring means and unseat said flexible face from around said first inlet port to permit communication of vacuum through said first inlet port.
Claim 6
Dependent Claim
176 words
The power braking system, as recited in claim 4 wherein said second valve means includes: a second shaft centrally located in the second inlet port of said housing; a second flexible face member attached to one end of said second shaft and located on the atmospheric side of said second inlet port, said face member being larger in diameter than said second inlet port; a keeper member located on the other end of said second shaft; and second spring means surrounding said second shaft and located between the portion of the housing surrounding said second inlet port and said keeper member, said spring means urging said second flexible face member into a seating position on the housing surrounding said second inlet port during said first directional position of said wall means to preclude communication of air at atmospheric pressure into said internal chamber, said second cam surface acting on said keeper member to overcome said second spring means and allow air at atmospheric pressure into said chamber during said second directional position of the wall means.
Claim 7
Dependent Claim
64 words
The power braking system as recited in claim 5 wherein said first valve means further includes: a yoke located on the end of said first shaft, said yoke surrounding a portion of said lever arm means adjacent said first cam surface; and a roller pin located in the yoke for engaging said first cam surface during said first directional position of said wall means.
Claim 8
Dependent Claim
100 words
The power braking system as recited in claim 5 wherein said first valve means further includes: a head located on the end of the said first shaft; a beam member having a slot wherein said push rod member is located, said beam member being pivotally located on said housing adjacent said first inlet port; and a fork located on the end of said beam member, said fork surrounding said first shaft and engaging said head when said first cam surface acts on said beam to unseat said first flexible face member during the second directional position of said wall means.
Claim 9
Dependent Claim
37 words
The power braking system, as recited in claim 6 further including: means located in said conduit for transmitting a signal to an indicator device to alert an operator of the fluid pressure transmitted to said actuation valve.
Claim 10
Dependent Claim
31 words
The power braking system, as recited in claim 8 further including: means located between the source of vacuum and the pump for preventing fluctuation in the pressure level of the vacuum.
Claim 11
Dependent Claim
109 words
The power braking system, as recited in claim 1 wherein said actuation means includes: a power transmission shaft having said slot located in one end thereof; and spring means located on the other end of said power transmission shaft and connected to said first and second valve means for alternately opening and closing the first and second inlet ports, respectively, to create the first and second directional position changes in the movable wall, said spring means and said caging means cooperating to move the power transfer means in a manner to assure only one of said first and second valve means is opened and closed at the same time.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |