Patent US3674954A successfully refreshed from Google Patents.
US3674954A
Expired / Lapsed
US
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Pressure responsive mechanism
Assignee: MIDBRAKE Corp
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Filing: 1970-06-19
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Granted: 1972-07-04
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Expires: 1990-06-19
Abstract
Abstract A pressure responsive mechanism for use in dual hydraulic brake systems of automotive vehicles wherein the front and rear brakes of the vehicle are provided with independent hydraulic brake systems actuated by a dual master cylinder, the pressure responsive mechanism being interposed between the dual master cylinder and the front and rear brake actuators and incorporating means actuable when a predetermined pressure differential occurs between the front and rear brake systems to effect a signal and being automatically reset when the pressure differential falls below a predetermined value. The pressure responsive mechanism also incorporates brake proportioning means and in the event of loss of pressure in the front brake system while pressurization of the rear brake system relative to the front brake system has been reduced by the brake proportioning means, means is also provided for disabling the brake proportioning means and restoring full pressurization of the rear brake system.
Inventors
- 👤 George R Kish
- 👤 Kenneth B Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:09
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/26; B60T17/00; B60T17/18; B60T17/22; B60T17/226
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
200 words
In a pressure responsive mechanism, the combination including a body defining a bore, said body having a pair of spaced fluid inlet passageways each communicating with said bore, an actuating member mounted for longitudinal movement in said bore intermediate said passageways, a pair of pressure responsive members disposed in said bore at opposite ends of said actuating member and intermediate said passageways, each of said pressure responsive members having an abutment surface thereon normally spaced from and movable into engagement with the adjacent end portion of said actuating member, said actuatinG member being movable from a first to a second position by one of said pressure responsive members in response to a differential in pressure in said inlet passageways, said actuating member being movable by the other of said pressure responsive members from said second position to said first position in response to an equal positive pressure in said inlet passageways, electric switch means, and means operable in response to movement of said actuating member from a first to a second position to close said switch means and operable in response to movement of said actuating member from said second position to said first position to open said switch means.
Claim 2
Dependent Claim
200 words
In a pressure responsive mechanism, the combination including a body defining a bore, said body having a pair of spaced fluid inlet passageways each communicating with said bore, an actuating member mounted for longitudinal movement in said bore intermediate said passageways, a pair of pressure responsive members disposed in said bore at opposite ends of said actuating member and intermediate said passageways, each of said pressure responsive members having an abutment surface thereon normally spaced from and movable into engagement with the adjacent end portion of said actuating member, said actuatinG member being movable from a first to a second position by one of said pressure responsive members in response to a differential in pressure in said inlet passageways, said actuating member being movable by the other of said pressure responsive members from said second position to said first position in response to an equal positive pressure in said inlet passageways, electric switch means, and means operable in response to movement of said actuating member from a first to a second position to close said switch means and operable in response to movement of said actuating member from said second position to said first position to open said switch means.
Claim 3
Dependent Claim
23 words
The combination as set forth in claim 1 including resilient means biasing each of said pressure responsive members away from said actuating member.
Claim 4
Dependent Claim
46 words
The combination as set forth in claim 1 including a sleeve disposed in said bore and encompassing a portion of said actuating member, and resilient means bearing against said sleeve and said pressure responsive members and biasing said pressure responsive members away from said actuating member.
Claim 5
Dependent Claim
28 words
The combination as set forth in claim 1 wherein said pressure responsive members are each in the form of a piston mounted for reciprocal movement in said bore.
Claim 6
Dependent Claim
87 words
The combination as set forth in claim 1 wherein said means operable in response to movement of said actuating member to actuate said switch means includes a plunger projecting into said bore and wherein said actuating member forms a pair of spaced cam surfaces adapted to engage and move said plunger upon movement of said actuator to said second position to close said switch means and to permit return movement of said plunger for opening said switch means upon movement of said actuator to said first position.
Claim 7
Dependent Claim
232 words
In a pressure responsive mechanism, the combination including a body defining a bore, said body having a pair of spaced fluid inlet passageways therein each communicating with said bore, an actuating member mounted for reciprocal movement in said bore, said actuating member including a central body portion and a pair of reduced diameter end portions projecting axially outwardly from the opposite ends of said central portion, said central portion defining a groove having spaced ramp surfaces on opposite sides thereof, a pair of pistons disposed in said bore at opposite ends of said actuating member, said pistons each defining a blind bore adapted to receive one of said end portions of said actuating member, a sleeve encompassing the medial portion of said actuating member and having an opening normally aligned with said groove in said central portion, a pair of springs bearing against said sleeve and biasing each of said pistons away from said actuating member, electrical switch means carried by said body and having a plunger projecting through said opening in said sleeve and into said groove in said central portion of said actuating member, said pistons being adapted to move said actuating member in said bore when a pressure differential exists at said inlet passageways whereby one of said ramp surfaces engages said plunger and moves said plunger in a direction normal to the longitudinal axis of said actuating member.
Claim 8
Dependent Claim
232 words
In a pressure responsive mechanism, the combination including a body defining a bore, said body having a pair of spaced fluid inlet passageways therein each communicating with said bore, an actuating member mounted for reciprocal movement in said bore, said actuating member including a central body portion and a pair of reduced diameter end portions projecting axially outwardly from the opposite ends of said central portion, said central portion defining a groove having spaced ramp surfaces on opposite sides thereof, a pair of pistons disposed in said bore at opposite ends of said actuating member, said pistons each defining a blind bore adapted to receive one of said end portions of said actuating member, a sleeve encompassing the medial portion of said actuating member and having an opening normally aligned with said groove in said central portion, a pair of springs bearing against said sleeve and biasing each of said pistons away from said actuating member, electrical switch means carried by said body and having a plunger projecting through said opening in said sleeve and into said groove in said central portion of said actuating member, said pistons being adapted to move said actuating member in said bore when a pressure differential exists at said inlet passageways whereby one of said ramp surfaces engages said plunger and moves said plunger in a direction normal to the longitudinal axis of said actuating member.
Claim 9
Dependent Claim
17 words
The combination as set forth in claim 6 including signal means controlled by said electrical switch means.
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |