Patent US2321211A successfully refreshed from Google Patents.
US3751919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic power brake booster motor
Assignee: Individual
•
Filing: 1970-10-15
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Granted: 1973-08-14
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Expires: 1990-10-15
Abstract
Abstract A hydraulic booster motor adapted to be connected to and to activate a vehicle''s master cylinder which is connected to a hydraulic braking system, the booster''s valve body defines two coaxial bores, the large bore carries a power piston which is slidable in it and powertransmittingly connected to the primary piston of the master cylinder, and the small bore carries a reaction piston which is slidable in it and powertransmittingly connected through a linkage to the brake pedal of the vehicle, the booster valve body, together with the two pistons it carries, define a variable volume into which fluid flow is forced through an inlet port and which leaves the variable volume through an exhaust passage which is restricted when driver pushes the brake pedal with his foot.
Inventors
- 👤 B Ron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:19
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/16; B60T13/161; B60T13/162
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
181 words
A brake booster for activating a vehicle''s master cylinder, comprising, a valve body which defines a first bore connected with a second bore, a power piston slideable in said first bore and being power-transmittingly connected to a primary piston of said master cylinder, a reaction piston slideable in said second bore being power-transmittingly connected to a brake pedal of said vehicle, said power and reaction pistons being spaced one from another when said booster is in its free position and adapted to establish a mechanical power-transmitting connection after a relative travel between the pistons, said valve body defining an inlet port communicating with a variable volume which is also defined by said valve body and in between said power and reaction pistons, a restriction point defined in between said valve body and said reaction piston adapted to abruptly restrict flow through itself in response to a relative travel of the reaction piston relative to the valve body, and a flow passage through said brake booster motor initiating at said inlet port, continuing through said variable volume and through said restriction point.
Claim 2
Dependent Claim
181 words
A brake booster for activating a vehicle''s master cylinder, comprising, a valve body which defines a first bore connected with a second bore, a power piston slideable in said first bore and being power-transmittingly connected to a primary piston of said master cylinder, a reaction piston slideable in said second bore being power-transmittingly connected to a brake pedal of said vehicle, said power and reaction pistons being spaced one from another when said booster is in its free position and adapted to establish a mechanical power-transmitting connection after a relative travel between the pistons, said valve body defining an inlet port communicating with a variable volume which is also defined by said valve body and in between said power and reaction pistons, a restriction point defined in between said valve body and said reaction piston adapted to abruptly restrict flow through itself in response to a relative travel of the reaction piston relative to the valve body, and a flow passage through said brake booster motor initiating at said inlet port, continuing through said variable volume and through said restriction point.
Claim 3
Dependent Claim
55 words
A brake booster motor as in claim 1 including spring means disposed in a power-transmitting linkage connecting said reaction piston to said brake pedal, making said linkage resilient while said spring means is active, and abutting sTop means making said spring means inactive when a certain level of force transmitted through said linkage is surpassed.
Claim 4
Dependent Claim
43 words
A brake booster motor as in claim 1 including a spring means urging said reaction piston in a direction toward said power piston to maintain a substantially constant pressure in said variable volume when said brake booster motor is in its free position.
Claim 5
Dependent Claim
50 words
A brake booster motor as in claim 1, including a secondary variable volume defined by said valve body and in between said power piston and a cover at the end of said first bore, said secondary variable volume being in communication with said flow passage downstream of the restriction point.
Claim 6
Dependent Claim
25 words
A brake booster motor as in claim 1, including a dampening means to dampen the movement of said reaction piston relative to said valve body.
Claim 7
Dependent Claim
38 words
A brake booster motor as in claim 5, wherein said dampening means comprises an annular damper chamber defined in between said valve body and said reaction piston and orifice means communicating said damper chamber to said flow passage.
Claim 8
Dependent Claim
185 words
A brake booster for activating a vehicle''s master cylinder, comprising, a valve body which defines a first bore connected with a second bore, a power piston slideable in said first bore and being power-transmittingly connected to a primary piston of said master cylinder, a reaction piston slideable in said second bore being power-transmittingly connected to a brake pedal of said vehicle, said power and reaction pistons being spaced one from another when said booster is in its free position and adapted to establish a mechanical power-transmitting connection after a relative travel between the pistons, said valve body defining an inlet port communicating with a variable volume which is also defined by said valve body and in between said power and reaction pistons, a restriction point formed in said valve body around said second bore and an edge of said reaction piston adapted to restrict flow through itself in response to a relative travel of the reaction piston and the valve body, and a flow passage through said brake booster motor initiating at said inlet port, continuing through said variable volume and through said restriction point.
Claim 9
Dependent Claim
185 words
A brake booster for activating a vehicle''s master cylinder, comprising, a valve body which defines a first bore connected with a second bore, a power piston slideable in said first bore and being power-transmittingly connected to a primary piston of said master cylinder, a reaction piston slideable in said second bore being power-transmittingly connected to a brake pedal of said vehicle, said power and reaction pistons being spaced one from another when said booster is in its free position and adapted to establish a mechanical power-transmitting connection after a relative travel between the pistons, said valve body defining an inlet port communicating with a variable volume which is also defined by said valve body and in between said power and reaction pistons, a restriction point formed in said valve body around said second bore and an edge of said reaction piston adapted to restrict flow through itself in response to a relative travel of the reaction piston and the valve body, and a flow passage through said brake booster motor initiating at said inlet port, continuing through said variable volume and through said restriction point.
Claim 10
Dependent Claim
55 words
A brake booster motor as in claim 7 including spring means disposed in a power-transmitting linkage connecting said reaction piston to said brake pedal, making said linkage resilient while said spring means is active, and abutting stop means making said spring means inactive when a certain level of force transmitted through said linkage is surpassed.
Claim 11
Dependent Claim
43 words
A brake booster motor as in claim 7 including a spring means urging said reaction piston in a direction toward said power piston to maintain a substantially constant pressure in said variable volume when said brake booster motor is in its free position.
Claim 12
Dependent Claim
50 words
A brake booster motor as in claim 7, including a secondary variable volume defined by said valve body and in between said power piston and a cover at the end of said first bore, said secondary variable volume being in communication with said flow passage downstream of the restriction point.
Claim 13
Dependent Claim
25 words
A brake booster motor as in claim 7, including a dampening means to dampen the movement of said reaction piston relative to said valve body.
Claim 14
Dependent Claim
38 words
A brake booster motor as in claim 11, wherein said dampening means comprises an annular damper chamber defined in between said valve body and said reaction piston and orifice means communicating said damper chamber to said flow passage.
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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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |