US3794147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boot and control mechanism
Assignee: Motors Liquidation Co
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Filing: 1972-12-05
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Granted: 1974-02-26
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Expires: 1992-12-05
Abstract
Abstract A power brake assembly has a boot through which the brake pedal operated push rod extends to control the power brake. Instead of the usual flexible convoluted rubber boot, the boot is made of two housings forming tubes or cylinders, one slidably located within the other, with the power brake piston extension containing the atmospheric air inlet filter extending into the inner housing. A switch mechanism is provided in the outer housing and includes a biasing spring acting on a switch contact carrier. The inner housing has a probe which engages the contact carrier so that in one slidable position of the inner housing relative to the outer housing the contact carrier is urged into position relative to other switch contacts so that the switch or switches comprising the switch mechanism have assumed positions, either open or closed, as desired. This occurs when the power brake piston has moved in the brake apply direction. When the power brake piston moves to the brake release position, the probe on the inner housing moves the contact carrier against the spring, changing the operational status positions of the switches. A vacuum control valve arrangement is also provided so that a port is closed or connected to atmosphere depending upon the position of the inner housing relative to the outer housing, if such a vacuum control is needed as, for example, in conjunction with a road speed control device.
Inventors
- 👤 R Shellhause
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:56
CPC Classifications
H; H01; H01H; H01H21/00; H01H21/02; H01H21/18; H01H21/22; H01H21/24; H01H21/26; B; B60; B60K; B60K31/00; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/46; B60T13/52; B60T13/567; B60T13/66; B60T13/72
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
247 words
In a brake operating mechanism including a brake booster having a fixed housing and a movable piston extension extending therefrom, a brake pedal, and a push rod extending axially into the piston extension and connecting the pedal and booster for controlled booster operation including axial movements of the piston extension in brake applying and brake releasing directions, the improvement of: a booster boot and control mechanism comprising: an outer housing member operatively secured to the fixed booster housing and receiving the piston extension and the push rod therethrough, an inner housing member reciprocably received within said outer housing and receiving the piston extension therein and the push rod therethrough, and resiliently biased switch means mounted in one of said housing members and resiliently urging said inner housing member in one axial direction into axially abutting engagement with the piston extension and yieldably opposing movement of the piston extension in the brake releasing direction within at least a part of the range of axial movements of the piston extension, said switch means having a first operational status when overcome by sufficient movement of the piston extension in the brake releasing direction to establish a brake release condition, and having a second operational status different from its first operational status established when the piston extension is moved in the brake applying direction from a brake release position in accordance with operation of the brake booster with said inner housing member being moved therewith by the resiliently biased switch means.
Claim 2
Dependent Claim
247 words
In a brake operating mechanism including a brake booster having a fixed housing and a movable piston extension extending therefrom, a brake pedal, and a push rod extending axially into the piston extension and connecting the pedal and booster for controlled booster operation including axial movements of the piston extension in brake applying and brake releasing directions, the improvement of: a booster boot and control mechanism comprising: an outer housing member operatively secured to the fixed booster housing and receiving the piston extension and the push rod therethrough, an inner housing member reciprocably received within said outer housing and receiving the piston extension therein and the push rod therethrough, and resiliently biased switch means mounted in one of said housing members and resiliently urging said inner housing member in one axial direction into axially abutting engagement with the piston extension and yieldably opposing movement of the piston extension in the brake releasing direction within at least a part of the range of axial movements of the piston extension, said switch means having a first operational status when overcome by sufficient movement of the piston extension in the brake releasing direction to establish a brake release condition, and having a second operational status different from its first operational status established when the piston extension is moved in the brake applying direction from a brake release position in accordance with operation of the brake booster with said inner housing member being moved therewith by the resiliently biased switch means.
Claim 3
Dependent Claim
333 words
In a brake operating mechanism including a brake booster having a fixed housing and a movable piston extension extending therefrom, a brake pedal, and a push rod extending axially into the piston extension and connecting the pedal and booster for controlled booster operation including axial movements of the piston extension in brake applying and brake releasing directions, the improvement of: a booster boot and control mechanism comprising: an outer housing member operatively secured to the fixed booster housing and receiving the piston extension and the push rod therethrough, an inner housing member reciprocably received within said outer housing and receiving the piston extension therein and the push rod therethrough, control valve means including a port element formed in one of said housing members and a port control element on the other of said housing members aligned with said port element, one of said elements being movable relative to the other of said elements with movement of said inner housing member relative to said outer housing member to open and close said port element, and resiliently biased switch means mounted in one of said housing members and resiliently urging said inner housing member in one axial direction into axially abutting engagement with the piston extension and yieldably opposing movement of the piston extension in the brake releasing direction within at least a part of the range of axial movements of the piston extension, said resiliently biased switch means having a first operational status when overcome by sufficient movement of the piston extension in the brake releasing direction to establish a brake release condition, and having a second operational status different from its first operational status established when the piston extension is moved in the brake applying direction from a brake release position in accordance with operation of the brake booster with said inner housing member being moved therewith by the resiliently biased switch means, said control valve means port element being closed and opened substantially concurrent with changes in said switch means operational status.
Claim 4
Dependent Claim
333 words
In a brake operating mechanism including a brake booster having a fixed housing and a movable piston extension extending therefrom, a brake pedal, and a push rod extending axially into the piston extension and connecting the pedal and booster for controlled booster operation including axial movements of the piston extension in brake applying and brake releasing directions, the improvement of: a booster boot and control mechanism comprising: an outer housing member operatively secured to the fixed booster housing and receiving the piston extension and the push rod therethrough, an inner housing member reciprocably received within said outer housing and receiving the piston extension therein and the push rod therethrough, control valve means including a port element formed in one of said housing members and a port control element on the other of said housing members aligned with said port element, one of said elements being movable relative to the other of said elements with movement of said inner housing member relative to said outer housing member to open and close said port element, and resiliently biased switch means mounted in one of said housing members and resiliently urging said inner housing member in one axial direction into axially abutting engagement with the piston extension and yieldably opposing movement of the piston extension in the brake releasing direction within at least a part of the range of axial movements of the piston extension, said resiliently biased switch means having a first operational status when overcome by sufficient movement of the piston extension in the brake releasing direction to establish a brake release condition, and having a second operational status different from its first operational status established when the piston extension is moved in the brake applying direction from a brake release position in accordance with operation of the brake booster with said inner housing member being moved therewith by the resiliently biased switch means, said control valve means port element being closed and opened substantially concurrent with changes in said switch means operational status.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |