Patent US6230218B1 successfully refreshed from Google Patents.
US4333403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retainer railway car truck bolster spring
Assignee: TRANS DYNE INCORPORATED 332 S MICHIGAN CHICAGO IL A CORP OF
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Filing: 1979-04-09
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Granted: 1982-06-08
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Expires: 1999-04-09
Abstract
Abstract One or more of the springs supporting the bolster of a railway car truck is a two stage spring group comprising an outer coil and an inner coil disposed within and coaxial with the outer spring. A retainer is provided to hold the inner spring in relation to the outer spring. The retainer has helically arranged lugs or a flange in engagement with the outer coil at the lower end, and the retainer also includes a support surface for supporting the lower end of the inner coil.
Inventors
- 👤 Carl E. Tack
- 👤 Sergei G. Guins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:59
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/02; F16F1/04; F16F1/12; F16F1/126; B; B61; B61F; B61F5/00; B61F5/02; B61F5/04; B61F5/06; F16F3/00; F16F3/02; F16F3/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
97 words
In a railway truck comprising a pair of side frames having windows therein for receiving the ends of a bolster, and a plurality of spring groups extending upward from the floor of said window and supporting said bolster, said spring groups including a two stage spring group comprising an outer coil and an inner coil in coaxial relation with the outer coil, and retainer means for retaining said inner and outer coils in coaxial relation, said retainer means and said outer coil having a mating helical relation supporting the retainer means above the side frame window floor.
Claim 2
Dependent Claim
97 words
In a railway truck comprising a pair of side frames having windows therein for receiving the ends of a bolster, and a plurality of spring groups extending upward from the floor of said window and supporting said bolster, said spring groups including a two stage spring group comprising an outer coil and an inner coil in coaxial relation with the outer coil, and retainer means for retaining said inner and outer coils in coaxial relation, said retainer means and said outer coil having a mating helical relation supporting the retainer means above the side frame window floor.
Claim 3
Dependent Claim
79 words
A spring retainer for a two stage spring group in a railway truck, said two stage spring group comprising an inner coil received in an outer coil in coaxial relation and spaced therefrom, said spring retainer comprising a unitary body in mating helical engagement with said outer coil, said body being spaced above the lower end of the outer coil, and a central boss on the upper surface of said body, said inner coil being received over said boss.
Claim 4
Dependent Claim
79 words
A spring retainer for a two stage spring group in a railway truck, said two stage spring group comprising an inner coil received in an outer coil in coaxial relation and spaced therefrom, said spring retainer comprising a unitary body in mating helical engagement with said outer coil, said body being spaced above the lower end of the outer coil, and a central boss on the upper surface of said body, said inner coil being received over said boss.
Claim 5
Dependent Claim
73 words
A spring retainer for a two stage spring group in a railway truck, said two stage spring group comprising an inner coil received in an outer coil in coaxial relation, said spring retainer comprising a body having an upper surface for supporting the lower end of said inner coil, said body and said outer coil having a mating helical relation wherein said body is supported above the lower end of the outer coil.
Claim 6
Dependent Claim
73 words
A spring retainer for a two stage spring group in a railway truck, said two stage spring group comprising an inner coil received in an outer coil in coaxial relation, said spring retainer comprising a body having an upper surface for supporting the lower end of said inner coil, said body and said outer coil having a mating helical relation wherein said body is supported above the lower end of the outer coil.
Claim 7
Dependent Claim
26 words
The spring retainer of claim 3 wherein said body comprises a continuous helical flange extending from said body in mating helical engagement with said outer coil.
Claim 8
Dependent Claim
12 words
The spring retainer of claim 3 wherein said body is cup shaped.
Claim 9
Dependent Claim
32 words
The spring retainer of claim 3 wherein a plurality of spring groups are provided, the outer coil of one of said groups differing in free height from another of the outer coils.
Claim 10
Dependent Claim
30 words
The spring retainer of claim 3 wherein said body comprises a plurality of ears extending from said body in a helical fashion in mating helical engagement with said outer coil.
Claim 11
Dependent Claim
36 words
The spring retainer of claim 7 wherein the radius of said ears decreases from the upper ear to the lower ear, whereby to conform to the flattened configuration of the lower end of the outer coil.
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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) | 1985-06-07 | 1985-12-07 | 1986-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-07 | 1989-12-07 | 1990-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-07 | 1993-12-07 | 1994-06-08 | $7700.00 | Window Closed / Lapsed |