US3833095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic power brake system
Assignee: Knorr Brake Holding Corp
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Filing: 1973-03-05
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Granted: 1974-09-03
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Expires: 1993-03-05
Abstract
Abstract A hydraulic power brake system is disclosed having a brake actuator housing containing service and hand brake pressure chambers and pistons for actuating a brake head. An automatic adjuster is provided connecting the two pistons comprising two cooperating members connecting the pistons. A first of the members is permitted substantial rotary movement and limited axial movement and a second of the cooperating members is permitted axial movement but not rotary movement. A spring such as a wave washer is used for yieldably permitting greater axial movement of the first member when brakes are applied by actuation of the hand brake piston than when brakes are applied by actuation of the service brake piston.
Inventors
- 👤 T Engle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:40
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/14; F16D65/16; F16D65/18; F16D55/00; F16D55/02; F16D55/22; F16D55/224; F16D65/38; F16D65/40; F16D65/52; F16D65/56; F16D65/567; F16D2121/00; F16D2121/02; F16D2121/12; F16D2123/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
189 words
A hydraulic power brake system for selective operation of disc brakes having a brake actuator housing containing axially spaced coaxial service and hand brake pressure chambers and service and hand brake pistons disposed end to end for actuating brake heads and an automatic adjuster disposed coaxially within the service piston for connecting the two pistons wherein an improved automatic ajuster comprises; a. means including two coaxial cooperating cylindrical members connecting the two pistons and connected to each other through threads normally permitting free rotation of one member relative to the other; 1. a first of the members being permitted substantial rotary movement and limited axial movement relative to the housing, 2. a second of the members being permitted axial movement but not rotary movement relative to the housing; b. yieldable means including a spring disposed directly between the movable first member and the fixed housing for yieldably permitting greater axial movement of the first member relative to the housing to compensate for back-lash in the threads when brakes are applied by actuation of the hand brake piston than when brakes are applied by actuation of the service brake piston.
Claim 2
Dependent Claim
189 words
A hydraulic power brake system for selective operation of disc brakes having a brake actuator housing containing axially spaced coaxial service and hand brake pressure chambers and service and hand brake pistons disposed end to end for actuating brake heads and an automatic adjuster disposed coaxially within the service piston for connecting the two pistons wherein an improved automatic ajuster comprises; a. means including two coaxial cooperating cylindrical members connecting the two pistons and connected to each other through threads normally permitting free rotation of one member relative to the other; 1. a first of the members being permitted substantial rotary movement and limited axial movement relative to the housing, 2. a second of the members being permitted axial movement but not rotary movement relative to the housing; b. yieldable means including a spring disposed directly between the movable first member and the fixed housing for yieldably permitting greater axial movement of the first member relative to the housing to compensate for back-lash in the threads when brakes are applied by actuation of the hand brake piston than when brakes are applied by actuation of the service brake piston.
Claim 3
Dependent Claim
17 words
A hydraulic power brake system according to claim 1 wherein the yieldable means is a wave washer.
Claim 4
Dependent Claim
78 words
a second of the members being permitted axial movement but not rotary movement relative to the housing; b. yieldable means including a spring disposed directly between the movable first member and the fixed housing for yieldably permitting greater axial movement of the first member relative to the housing to compensate for back-lash in the threads when brakes are applied by actuation of the hand brake piston than when brakes are applied by actuation of the service brake piston.
Claim 5
Dependent Claim
78 words
a second of the members being permitted axial movement but not rotary movement relative to the housing; b. yieldable means including a spring disposed directly between the movable first member and the fixed housing for yieldably permitting greater axial movement of the first member relative to the housing to compensate for back-lash in the threads when brakes are applied by actuation of the hand brake piston than when brakes are applied by actuation of the service brake piston.
Claim 6
Dependent Claim
27 words
A hydraulic power brake system according to claim 1 wherein the second member is a nut and the first member is a stud threaded into the nut.
Claim 7
Dependent Claim
26 words
A hydraulic power brake system according to claim 3 wherein the nut is secured to the service piston and is operable axially with the service piston.
Claim 8
Dependent Claim
37 words
A hydraulic power brake system according to claim 4 wherein the stud has a head that is normally spaced a small distance from the hand brake piston when the hand brake piston is in its released position.
Claim 9
Dependent Claim
55 words
A hydraulic power brake system according to claim 5 wherein hand brake operating members is provided for driving the hand brake piston against the head of the stud, compressing the yieldable means and actuating a brake shoe by axial movement of the stud, the nut and the service piston as permitted by the yieldable means.
Claim 10
Dependent Claim
42 words
A hydraulic power brake system according to claim 6 wherein means is provided for driving the hand brake piston in a direction for brake release in response to fluid pressure and in opposite direction for application of the brakes by spring pressure.
Claim 11
Dependent Claim
29 words
A hydraulic power brake system according to claim 6 wherein means is provided for preventing rotation of the stud when it is moved axially by the hand brake piston.
Claim 12
Dependent Claim
33 words
A hydraulic power brake system according to claim 8 wherein the means for preventing rotation comprises an abrasive surface on the head of the stud that is contacted by the hand brake piston.
Claim 13
Dependent Claim
82 words
A hydraulic power brake system according to claim 1 wherein a brake head is secured to carrier pins journalled by the housing and a disc brake friction pad is detachably secured to the brake head and means is provided for detachably securing the friction pad comprising; a. a back plate for supporting the friction pad; b. the back plate having registration openings formed therein for receiving the carrier pins, and c. means for detachably securing the back plate to the brake head.
Claim 14
Dependent Claim
42 words
A hydraulic power brake system according to claim 10 wherein said carrier pins have heads protruding slightly from the brake head and the back plate openings are in registration with the heads of the carrier pins for detachablY positioning the friction pads.
Claim 15
Dependent Claim
33 words
A hydraulic power brake system according to claim 11 wherein the detachable securing means comprises lugs on sides of the back plate and a mounting pin securing the lugs to the brake head.
Claim 16
Dependent Claim
34 words
A hydraulic power brake system according to claim 12 wherein the mounting pin passes through openings formed in the lugs, a portion of the brake head and transveresly through one of the carrier pins.
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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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |