Patent US6267767B1 successfully refreshed from Google Patents.
US4077496A
Expired / Lapsed
US
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Railway truck movement damping
Assignee: A Stucki Co
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Filing: 1976-06-14
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Granted: 1978-03-07
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Expires: 1996-06-14
Abstract
Abstract A hydraulic snubber device and method of damping for railway trucks and more particularly a snubber adapted to be interposed between a bolster and a side frame member and being operative to provide a first damping rate when the railway car is operating on tangent track or at equilibrium speed on super elevated track and to provide a second relatively higher damping rate when the railway car is operating on super elevated track at low speed and in all instances of severe rocking.
Inventors
- 👤 Donald Wiebe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:46
CPC Classifications
B; B61; B61F; B61F5/00; B61F5/02; B61F5/04; B61F5/12; B61F5/127
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
132 words
A method of damping relative movement between railway truck side frame members and a railway truck bolster member, extending transversely between said side frame members, during movement of a loaded railway freight car assembly on a track comprising the steps of: applying substantially equal first hydraulic damping forces to said members adjacent each longitudinal end of said bolster member when said railway car assembly is normally operating on tangent track and when said railway car is operating at equilibrium speed; applying substantially equal second hydraulic damping forces to said members adjacent each longitudinal end of said bolster member when said railway car assembly is operating at low speed on superelevated track and in all instances of severe rocking; and said second hydraulic damping forces being greater than said first hydraulic damping forces.
Claim 2
Independent Claim
132 words
A method of damping relative movement between railway truck side frame members and a railway truck bolster member, extending transversely between said side frame members, during movement of a loaded railway freight car assembly on a track comprising the steps of: applying substantially equal first hydraulic damping forces to said members adjacent each longitudinal end of said bolster member when said railway car assembly is normally operating on tangent track and when said railway car is operating at equilibrium speed; applying substantially equal second hydraulic damping forces to said members adjacent each longitudinal end of said bolster member when said railway car assembly is operating at low speed on superelevated track and in all instances of severe rocking; and said second hydraulic damping forces being greater than said first hydraulic damping forces.
Claim 3
Dependent Claim
40 words
A method as specified in claim 1 wherein said substantially equal second hydraulic damping forces are applied to said members when said railway car is operating at low speed on both the left and the right side of superelevated track.
Claim 4
Dependent Claim
58 words
A method as specified in claim 1 including the additional step of applying substantially equal third hydraulic damping forces to said members adjacent each longitudinal end of said bolster member when said railway car is operating at transitional conditions intermediate the operating conditions of said railway car during the application of said first and second hydraulic damping forces.
Claim 5
Dependent Claim
26 words
A method as specified in claim 3 with said third hydraulic damping forces being at a force level intermediate said first and second hydraulic damping forces.
Claim 6
Dependent Claim
38 words
A method as specified in claim 1 wherein said hydraulic damping forces are applied to said members at locations adjacent spring groups supporting adjacent end of said bolster member on said side frame members of said railway car.
Claim 7
Dependent Claim
35 words
A method as specified in claim 1 including the additional step of continuously biasing the means for applying said hydraulic damping forces away from said truck side frame members and towards said truck bolster member.
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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) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |