US3589480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railway disc brake
Assignee: Haldex AB
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Filing: 1969-09-24
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Granted: 1971-06-29
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Expires: 1989-09-24
Abstract
Abstract Automatic brake adjusting means for disc brakes, on opposite sides of a railway wheel is disclosed, having two telescopically adjustable piston rod parts taking up slack in the rigging. A spring-biased braking force threshold means operates a clutch to permit rotation of a sleeve having a spiral groove during braking. Upon release of braking the sleeve in a return motion serves to telescopically adjust the piston rod parts, as afforded by operation of a one-way clutch.
Inventors
- 👤 Lars B Axelsson
- 👤 Kaj A Lilja
- 👤 Sten-Eric Svensson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:32
CPC Classifications
F; F16; F16D; F16D55/00; F16D55/02; F16D55/22; F16D55/224; F16D55/2245; B; B61; B61H; B61H15/00; B61H15/0007; B61H15/0014; B61H15/0028; B61H5/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
A railway vehicle brake of the kind actuated by a longitudinally moving piston unit applying braking forces, comprising in combination, a piston rod having two telescopically displaceable rod parts, a first of which is screw-threaded into a second, a sleeve with a spirally shaped groove, a one way clutch connecting said sleeve to one of said rod parts, a stationary pin extending into said spiral groove, a spring coupled between said sleeve and said piston rod to transmit braking forces, a second clutch biased by said spring in a locking position coupled between said sleeve and said piston rod, and means imparting linear motion to said sleeve tending to rotate the spiral groove about said stationary pin in response to braking forces when said spring bias is overcome by the braking forces.
Claim 2
Dependent Claim
132 words
A railway vehicle brake of the kind actuated by a longitudinally moving piston unit applying braking forces, comprising in combination, a piston rod having two telescopically displaceable rod parts, a first of which is screw-threaded into a second, a sleeve with a spirally shaped groove, a one way clutch connecting said sleeve to one of said rod parts, a stationary pin extending into said spiral groove, a spring coupled between said sleeve and said piston rod to transmit braking forces, a second clutch biased by said spring in a locking position coupled between said sleeve and said piston rod, and means imparting linear motion to said sleeve tending to rotate the spiral groove about said stationary pin in response to braking forces when said spring bias is overcome by the braking forces.
Claim 3
Dependent Claim
43 words
A railway vehicle brake as defined in claim 1 including means causing said one way clutch to transmit motion from said sleeve to telescopically displace said rod parts upon release of the braking forces, when said second clutch is in a locking position.
Claim 4
Dependent Claim
19 words
A railway vehicle brake as defined in claim 1 including means fixing one of said rod parts against rotation.
Claim 5
Dependent Claim
24 words
A brake as defined in claim 1 including a pin carrying said sleeve and extending therethrough between said spring and said moving piston unit.
Claim 6
Dependent Claim
48 words
A brake as defined in claim 1 with disc brakes operable on opposite sides of a railway wheel including a piston head and a movable piston rod extending from said head, and levers coupled respectively from said piston head and said piston rod to actuate said disc brakes.
Claim 7
Dependent Claim
37 words
A brake as defined in claim 5 including a yoke in which each of said levers is pivoted, and a spring member coupled between said levers tending to release said disc brakes from contact with said wheel.
Claim 8
Dependent Claim
20 words
A brake as defined in claim 5 including a braking piston with the piston biased for return by a spring.
Claim 9
Dependent Claim
16 words
A brake as defined in claim 1 including means for manually telescoping said displaceable rod parts.
Claim 10
Dependent Claim
30 words
A brake as defined in claim 1 including two spaced members between said piston unit and said piston rod adapted to transmit linear braking forces when said spring is compressed.
Claim 11
Dependent Claim
66 words
A brake unit as defined in claim 1 including means to rotate said spiral groove in said sleeve freely about said stationary pin from a rest position when braking forces above a threshold level are applied and to telescope said rod parts by return of said sleeve to said rest position upon release of the braking forces to thereby take up slack in the brake rigging.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |