US4016959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Actuator for a rail wheel tread scrubber block
Assignee: BSA SA
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Filing: 1976-02-13
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Granted: 1977-04-12
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Expires: 1996-02-13
Abstract
Abstract Movement of a fluid pressure operated piston serves to engage a scrubber block with a railway wheel by means of motion of a piston rod. The piston rod is toothed to engage a take up mechanism for adjusting a clearance between the scrubber block and the wheel.
Inventors
- 👤 Pierre R. Menard
- 👤 Andre Ledoux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:36
CPC Classifications
B; B61; B61C; B61C15/00; F; F16; F16D; F16D65/00; F16D65/38; F16D65/40; F16D65/52; F16D65/54
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
150 words
A fluid pressure controlled cylinder-piston unit for actuating a wheel contacting surface toward a rail wheel, comprising in combination, a cylinder, a piston movable forward in said cylinder under influence of fluid pressure and held in a return position by a spring, a piston rod movable with said piston having a toothed surface, and a locking element comprising a member spring biased against the piston rod teeth and movable with the piston rod positioned for locked engagement with the toothed surface to follow the piston rod during a forward stroke toward said wheel and to lock the piston rod relative to the cylinder on the return stroke after movement over a predetermined clearance distance between said wheel contacting surface and wheel wherein the piston rod defines a longitudinal slot and said locking element comprises a pin extending through said rod, whereby movement in said slot comprises said predetermined clearance distance.
Claim 2
Dependent Claim
150 words
A fluid pressure controlled cylinder-piston unit for actuating a wheel contacting surface toward a rail wheel, comprising in combination, a cylinder, a piston movable forward in said cylinder under influence of fluid pressure and held in a return position by a spring, a piston rod movable with said piston having a toothed surface, and a locking element comprising a member spring biased against the piston rod teeth and movable with the piston rod positioned for locked engagement with the toothed surface to follow the piston rod during a forward stroke toward said wheel and to lock the piston rod relative to the cylinder on the return stroke after movement over a predetermined clearance distance between said wheel contacting surface and wheel wherein the piston rod defines a longitudinal slot and said locking element comprises a pin extending through said rod, whereby movement in said slot comprises said predetermined clearance distance.
Claim 3
Dependent Claim
147 words
A fluid pressure controlled cylinder-piston unit for actuating a wheel contacting surface toward a rail wheel, comprising in combination, a cylinder, a piston movable forward in said cylinder under influence of fluid pressure and held in a return position by a spring, a piston rod movable with said piston having a toothed surface, and a locking element positioned for locked engagement with the toothed surface to follow the piston rod during a forward stroke toward said wheel and to lock the piston rod relative to the cylinder on the return stroke after movement over a predetermined clearance distance between said wheel contacting surface and wheel wherein said locking element is wedge shaped and said cylinder defines a wedge shaped cavity mating with said element to permit a range of movement disengaging with the teeth on said rod during the forward stroke and reengaging upon the return stroke.
Claim 4
Dependent Claim
147 words
A fluid pressure controlled cylinder-piston unit for actuating a wheel contacting surface toward a rail wheel, comprising in combination, a cylinder, a piston movable forward in said cylinder under influence of fluid pressure and held in a return position by a spring, a piston rod movable with said piston having a toothed surface, and a locking element positioned for locked engagement with the toothed surface to follow the piston rod during a forward stroke toward said wheel and to lock the piston rod relative to the cylinder on the return stroke after movement over a predetermined clearance distance between said wheel contacting surface and wheel wherein said locking element is wedge shaped and said cylinder defines a wedge shaped cavity mating with said element to permit a range of movement disengaging with the teeth on said rod during the forward stroke and reengaging upon the return stroke.
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) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |