US4175700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Support and/or locating means for rails in rail tracks
Assignee: BTR South Africa Ltd
•
Filing: 1977-06-10
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Granted: 1979-11-27
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Expires: 1997-06-10
Abstract
Abstract A rail pad made of substantially rigid electrically insulating material which is chosen to by yieldable to a predetermined extent, the pad having upstanding rail locating formations on its rail engaging face and oppositely directed pad locating formations on its sleeper engaging face to locate the pad relative to a supporting sleeper, the pad being provided with a series of recesses in its sleeper engaging face wherein the unrecessed area of the face is calculated to be capable of carrying the required load.
Inventors
- 👤 Erich F. Gehrke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:02
CPC Classifications
E; E01; E01B; E01B9/00; E01B9/02; E01B9/28; E01B9/30; E01B9/306; E01B9/68; E01B9/685; E01B9/686; E01B9/681
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
160 words
A rail pad made of substantially rigid, electrically insulating material and having a rail engaging face and an opposite sleeper engaging face; said rail pad having a hardness within one of the following ranges of hardness: (a) 60-80 Shore A, (b) 62-68 Shore D, and (c) 60-80 DIN 53456 scale of ball indentation; said pad having a pair of upstanding, spaced, parallel, rail locating formations on its rail engaging face to operatively receive therebetween a rail foot and having oppositely directed pad locating formations on its sleeper engaging face to operatively co-operate with a sleeper to locate the pad relative to the sleeper; said pad being provided with a series of recesses in its sleeper engaging face and an unrecessed area outside said recesses; the unrecessed area of said face being dimensioned to carry an operative load of a required magnitude and the said material being deformable under a predetermined stress to cause said material to flow into said recesses.
Claim 2
Dependent Claim
160 words
A rail pad made of substantially rigid, electrically insulating material and having a rail engaging face and an opposite sleeper engaging face; said rail pad having a hardness within one of the following ranges of hardness: (a) 60-80 Shore A, (b) 62-68 Shore D, and (c) 60-80 DIN 53456 scale of ball indentation; said pad having a pair of upstanding, spaced, parallel, rail locating formations on its rail engaging face to operatively receive therebetween a rail foot and having oppositely directed pad locating formations on its sleeper engaging face to operatively co-operate with a sleeper to locate the pad relative to the sleeper; said pad being provided with a series of recesses in its sleeper engaging face and an unrecessed area outside said recesses; the unrecessed area of said face being dimensioned to carry an operative load of a required magnitude and the said material being deformable under a predetermined stress to cause said material to flow into said recesses.
Claim 3
Dependent Claim
22 words
A rail pad as claimed in claim 1 in which the recesses are located inwardly of the periphery of the rail pad.
Claim 4
Dependent Claim
32 words
A rail pad as claimed in claim 1 in which the area of said face but for said recesses a series of elongated areas radiating from a central region of the face.
Claim 5
Dependent Claim
73 words
A rail pad as claimed in claim 1, in which: the rail engaging face also is provided with a series of recesses therein and an unrecessed area outside these recesses, such recesses being located to correspond in plan projection with said recesses in the sleeper engaging face, the full thickness of the pad being provided in at least one portion of the respective unrecessed areas of the respective faces of the rail pad.
Claim 6
Dependent Claim
32 words
The rail pad as claimed in claim 1, being constituted by an injection moulding having a mould inlet artifact disposed substantially at the center of one said face of said rail pad.
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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) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |