US3870231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rail fastening device
Assignee: Tetsudo Kizai Kogyo Co Ltd
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Filing: 1974-07-17
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Granted: 1975-03-11
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Expires: 1994-07-17
Abstract
Abstract A rail fastening device that is designed to tightly hold a rail on a prestressed-concrete tie by fastening an elastic fastening member bridged between a flange portion of the rail and a stepped portion formed on the tie, by screwing a fastening bolt into a female receptacle buried in the tie. Where the elastic fastening member and the inclined stepped portion of the tie are pressed together, a wedge-like member, which as an inclination conforming to that of the stepped portion, is interposed so as to prevent displacement of the elastic fastening member due to vibration and the like and so as to permit inching adjustment of the installation location of the rail fastening device.
Inventors
- 👤 Shigetaro Toyama
- 👤 Yoshio Matsuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:29
CPC Classifications
E; E01; E01B; E01B9/00; E01B9/02; E01B9/28; E01B9/30; E01B9/306
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
153 words
In a rail fastening device coacting between a flange portion of a rail placed on a concrete tie and a stepped portion inclined with respect to said rail and formed on said concrete tie, the fastening device including a fastening member bridged between said stepped and flange portions, whereby the rail is firmly held on the concrete tie by fastening said fastening member with bolts, the improvement comprising a wedge-like member interposed between said fastening member and said stepped portion, said stepped portion being formed into a configuration so as to have a substantially vertical side surface which progressively approaches the rail and a substantially horizontal upper surface which progressively inclines downwardly in the direction in which said vertical side surface progressively approaches the rail, said wedge-like member being associated with said stepped portion and having vertically and horizontally extending portions which are shaped to respectively conform with said vertical and horizontal surfaces.
Claim 2
Dependent Claim
153 words
In a rail fastening device coacting between a flange portion of a rail placed on a concrete tie and a stepped portion inclined with respect to said rail and formed on said concrete tie, the fastening device including a fastening member bridged between said stepped and flange portions, whereby the rail is firmly held on the concrete tie by fastening said fastening member with bolts, the improvement comprising a wedge-like member interposed between said fastening member and said stepped portion, said stepped portion being formed into a configuration so as to have a substantially vertical side surface which progressively approaches the rail and a substantially horizontal upper surface which progressively inclines downwardly in the direction in which said vertical side surface progressively approaches the rail, said wedge-like member being associated with said stepped portion and having vertically and horizontally extending portions which are shaped to respectively conform with said vertical and horizontal surfaces.
Claim 3
Dependent Claim
153 words
In a rail fastening device coacting between a flange portion of a rail placed on a concrete tie and a stepped portion inclined with respect to said rail and formed on said concrete tie, the fastening device including a fastening member bridged between said stepped and flange portions, whereby the rail is firmly held on the concrete tie by fastening said fastening member with bolts, the improvement comprising a wedge-like member interposed between said fastening member and said stepped portion, said stepped portion being formed into a configuration so as to have a substantially vertical side surface which progressively approaches the rail and a substantially horizontal upper surface which progressively inclines downwardly in the direction in which said vertical side surface progressively approaches the rail, said wedge-like member being associated with said stepped portion and having vertically and horizontally extending portions which are shaped to respectively conform with said vertical and horizontal surfaces.
Claim 4
Dependent Claim
153 words
In a rail fastening device coacting between a flange portion of a rail placed on a concrete tie and a stepped portion inclined with respect to said rail and formed on said concrete tie, the fastening device including a fastening member bridged between said stepped and flange portions, whereby the rail is firmly held on the concrete tie by fastening said fastening member with bolts, the improvement comprising a wedge-like member interposed between said fastening member and said stepped portion, said stepped portion being formed into a configuration so as to have a substantially vertical side surface which progressively approaches the rail and a substantially horizontal upper surface which progressively inclines downwardly in the direction in which said vertical side surface progressively approaches the rail, said wedge-like member being associated with said stepped portion and having vertically and horizontally extending portions which are shaped to respectively conform with said vertical and horizontal surfaces.
Claim 5
Dependent Claim
19 words
A rail fastening device in accordance with claim 1, in which the fastening member comprises a platelike spring member.
Claim 6
Dependent Claim
25 words
A rail fastening device in accordance with claim 2, in which a pad of shock-absorbing material is interposed between the concrete tie and the rail.
Claim 7
Dependent Claim
42 words
A rail fastening device in accordance with claim 3, in which a buried receptacle is provided in the tie for receiving the bolt, and in which each of the pad, the buried receptacle and the wedge-like member is made of electric-insulating material.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |