US3576293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct fixation rail fastener apparatus
Assignee: LANDIS INDUSTRIES Inc
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Filing: 1969-02-26
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Granted: 1971-04-27
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Expires: 1989-02-26
Abstract
Abstract A rail fastener device for directly affixing rapid transit system rail apparatus to a rigid support structure. The device includes a rail plate and a baseplate which are separated by a layer of elastomeric material which is bonded to the adjacent sides of each plate. Means are provided for fastening the rail directly to the rail plate, and means are provided for fastening the baseplate directly to the support structure. The rail plate, however, is free to float on the elastomeric material with respect to said baseplate so as to provide vibrational damping as well as electrical isolation therebetween.
Inventors
- 👤 Robert L Landis
- 👤 Edward D O'brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:08
CPC Classifications
E; E01; E01B; E01B9/00; E01B9/38; E01B9/40; E01B9/02; E01B9/04; E01B9/44; E01B9/46; E01B9/62; E01D; E01D19/00; E01D19/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
273 words
A fastener device for fastening a rail means to a supporting structure and providing vibrational dampening and electrical isolation between the rail means and the supporting structure comprising: a rigid first plate means and a rigid second plate means disposed in overlying relationship and including apertures in registry with each other; a layer of electrically nonconductive elastomeric material, said first and second plate means being separated by said layer of elastomeric material, said elastomeric material being securely bonded to the adjacent faces of said first and second plate means, at least one edge of said first plate means being bent upwardly and outside of the overlying edge of said second plate means and extending upwardly at least as far as the lower surface of said second plate means, the proximate extremities of said first and second plate means being separated by a portion of said elastomeric material which acts as a spacer therebetween whereby said one edge serves to limit lateral motion of said first plate means relative to said second plate means; and securing means for securing said second plate means to the rail means, said securing means including bolt means which extend through the apertures in both of said first and second plate means and corresponding apertures in said separating layer of elastomeric material, and metallic sleeve means extending through the apertures in said second plate means and engaging the upper surface of said first plate means to transmit the force applied to said bolt means directly to said first plate means, said bolt means and said sleeve means being electrically insulated from said second plate means by said elastomeric material.
Claim 2
Dependent Claim
273 words
A fastener device for fastening a rail means to a supporting structure and providing vibrational dampening and electrical isolation between the rail means and the supporting structure comprising: a rigid first plate means and a rigid second plate means disposed in overlying relationship and including apertures in registry with each other; a layer of electrically nonconductive elastomeric material, said first and second plate means being separated by said layer of elastomeric material, said elastomeric material being securely bonded to the adjacent faces of said first and second plate means, at least one edge of said first plate means being bent upwardly and outside of the overlying edge of said second plate means and extending upwardly at least as far as the lower surface of said second plate means, the proximate extremities of said first and second plate means being separated by a portion of said elastomeric material which acts as a spacer therebetween whereby said one edge serves to limit lateral motion of said first plate means relative to said second plate means; and securing means for securing said second plate means to the rail means, said securing means including bolt means which extend through the apertures in both of said first and second plate means and corresponding apertures in said separating layer of elastomeric material, and metallic sleeve means extending through the apertures in said second plate means and engaging the upper surface of said first plate means to transmit the force applied to said bolt means directly to said first plate means, said bolt means and said sleeve means being electrically insulated from said second plate means by said elastomeric material.
Claim 3
Dependent Claim
82 words
A fastener device as recited in claim 1 wherein said means for securing said second plate means to said rail means is a clip means having a first portion adapted for engaging the lower flange of said rail means as it rests upon the top of said second plate means and a second portion for frictionally engaging the upper surface of said second plate means, said clip means being secured to said second plate means by a suitable mechanical force applying means.
Claim 4
Dependent Claim
43 words
A fastener device as recited in claim 1 wherein the portion Of the upper surface of said second plate means engaged by said clip means is irregular so as to increase the frictional engagement between said clip means and said second plate means.
Claim 5
Dependent Claim
172 words
Rail fastener apparatus for directly affixing a rail to a rigid support structure comprising: upper plate means having a pair of parallel side edges, said upper plate means including means for securing the rail to the upper side thereof with the longitudinal axis of the rail lying parallel to said parallel side edges; a layer of elastomeric material bonded to the underside and said parallel side edges of said upper plate means; lower plate means having its upper side bonded to said layer of elastomeric material, said lower plate means having upturned side portions extending outside of said parallel side edges and terminating substantially flush with said upper side of said upper plate means, said side edges being separated from said side portions by a separating portion of said layer of elastomeric material whereby lateral motion of said upper plate means relative to said lower plate means is restrained to within predetermined limits; and means electrically insulated from said upper plate means for securing said lower plate means to said support structure.
Claim 6
Dependent Claim
172 words
Rail fastener apparatus for directly affixing a rail to a rigid support structure comprising: upper plate means having a pair of parallel side edges, said upper plate means including means for securing the rail to the upper side thereof with the longitudinal axis of the rail lying parallel to said parallel side edges; a layer of elastomeric material bonded to the underside and said parallel side edges of said upper plate means; lower plate means having its upper side bonded to said layer of elastomeric material, said lower plate means having upturned side portions extending outside of said parallel side edges and terminating substantially flush with said upper side of said upper plate means, said side edges being separated from said side portions by a separating portion of said layer of elastomeric material whereby lateral motion of said upper plate means relative to said lower plate means is restrained to within predetermined limits; and means electrically insulated from said upper plate means for securing said lower plate means to said support structure.
Claim 7
Dependent Claim
30 words
Rail fastener apparatus as recited in claim 4 wherein said attachment means is adjustable so as to provide for lateral adjustment of said rail with respect to said fastener apparatus.
Claim 8
Dependent Claim
39 words
Rail fastener apparatus as recited in claim 5 wherein said elastomeric material is of sufficient thickness to electrically isolate said upper plate means from said lower plate means when said fastener apparatus is subjected to normal operating load conditions.
Claim 9
Dependent Claim
72 words
Rail fastener apparatus as recited in claim 6 wherein the thickness of said elastomeric material which separates said upper plate means from said lower plate means is firm enough to prevent substantial reduction in the separation between said upper and lower plate means under normal load conditions yet is resilient enough to absorb a substantial amount of the vibrational energy which would otherwise be transmitted from said rail to said support structure.
Claim 10
Dependent Claim
22 words
Rail fastener apparatus as recited in claim 7 wherein said upper plate means includes slot means for accommodating said adjustable attachment means.
Claim 11
Dependent Claim
54 words
Rail fastener apparatus as recited in claim 8 wherein said attachment means is a bolted clip means, the bolt portion of which is operatively received by said slot means, and said clip means is adapted to frictionally engage said rail and said upper plate means in response to a tightening of said bolt means.
Claim 12
Dependent Claim
45 words
Rail fastener apparatus as recited in claim 9 wherein said means for securing said lower plate means to said support structure is a bolt means which extends upwardly through an aperture in said upper plate means so that access is provided to said securing means.
Claim 13
Dependent Claim
28 words
Rail fastener apparatus as recited in claim 8 wherein an opening is provided in the side of said apparatus leading to said slot means for providing drainage thereof.
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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |