US3891067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clearance-sensing slack adjuster for a vehicle brake-actuating pneumatic cylinder-piston unit
Assignee: Haldex AB
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Filing: 1974-06-17
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Granted: 1975-06-24
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Expires: 1994-06-17
Abstract
Abstract A clearance-sensing slack adjuster operated by an air cylinder brake application stroke has two linearly disposed spindles axially aligned. A screw threaded adjuster spindle is rotatably mounted in a rotationally immovable adjustment nut with a clearance space separating the spindle end in a normal position from the end of the other push spindle member which is rotatable within the brake push rod, so that the two spindles members can axially engage each other and rotate in a direction selected by one way clutch arrangements to adjust slack on the return stroke. Means is provided to prevent adjustment during the elasticity part of the release stroke. The screw threads of the two spindles have the same pitch but different diameters so that only the adjuster nut is non-self-locking.
Inventors
- 👤 Lars Bengt Axelsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:52
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/08; B60T17/081; F; F16; F16D; F16D65/00; F16D65/38; F16D65/40; F16D65/52; F16D65/56
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
179 words
A clearance-sensing slack-adjuster having a force delivering stroke direction, preferably built into a vehicle brake-actuating pneumatic cylinder-piston unit, including a force-receiving piston rod and a force-delivering push rod, both rods being substantially tubular and only axially movable in a fixed adjuster housing comprising in combination, an externally screwthreaded adjuster spindle rotationally journalled in the piston rod, a rotationally immovable adjuster nut in said housing about and threadingly engaging said spindle for axial movement therealong, an externally screw-threaded push spindle threadingly engaging the push rod, the diameter of the adjuster spindle being so much less than that of the push spindle that the engagement between the adjuster spindle and the adjuster nut is non-selflocking whereas the engagement between the push spindle and the push rod is self-locking, and means joining the two spindles and transmitting rotational movement from the adjuster spindle to the push spindle at their axial movement in the direction opposite the force delivering direction provided that the axial movement of the adjuster nut has exceeded a set control threshold distance (A) during the preceding force delivering stroke.
Claim 2
Dependent Claim
179 words
A clearance-sensing slack-adjuster having a force delivering stroke direction, preferably built into a vehicle brake-actuating pneumatic cylinder-piston unit, including a force-receiving piston rod and a force-delivering push rod, both rods being substantially tubular and only axially movable in a fixed adjuster housing comprising in combination, an externally screwthreaded adjuster spindle rotationally journalled in the piston rod, a rotationally immovable adjuster nut in said housing about and threadingly engaging said spindle for axial movement therealong, an externally screw-threaded push spindle threadingly engaging the push rod, the diameter of the adjuster spindle being so much less than that of the push spindle that the engagement between the adjuster spindle and the adjuster nut is non-selflocking whereas the engagement between the push spindle and the push rod is self-locking, and means joining the two spindles and transmitting rotational movement from the adjuster spindle to the push spindle at their axial movement in the direction opposite the force delivering direction provided that the axial movement of the adjuster nut has exceeded a set control threshold distance (A) during the preceding force delivering stroke.
Claim 3
Dependent Claim
42 words
A slack-adjuster according to claim 1, characterised by a first locking spring connecting the two spindles and a second locking spring connecting the push spindle to the piston rod, the locking directions for these two locking springs being opposite to each other.
Claim 4
Dependent Claim
42 words
A slack-adjuster according to claim 1, characterised by a coupling spring between the piston rod and the push spindle permitting movement of the push spindle into contact with the adjuster spindle after the exceeding of a certain force on the coupling spring.
Claim 5
Dependent Claim
34 words
A slack-adjuster according to claim 1, characterised by a control distance sleeve defining said control distance (A) with the adjuster nut and movable in the force delivering direction against the action of a counter-spring.
Claim 6
Dependent Claim
43 words
A slack-adjuster accoRding to claim 4, characterised by a stopping ring in the adjuster housing forming a stop for the adjuster nut relative to the adjuster housing at the axial movement of the adjuster nut in the direction opposite the force delivering direction.
Claim 7
Dependent Claim
16 words
A slack-adjuster according to claim 1, wherein the screw-thread pitches of the two spindles are different.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |