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US3998306A Expired / Lapsed US ⏱️ 0.0 years remaining

Rail construction for rail-type electrification systems

Assignee: Individual
•
Filing: 1975-08-08
•
Granted: 1976-12-21
•
Expires: 1995-08-08
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Abstract

Abstract A rail construction for rail-type electrification systems, comprising a conducting rail member having a cross-sectional configuration somewhat like a pair of channel shapes disposed back to back. One channel shape is used for suspension or mounting, as well as rigidity. The other channel shape contains a stainless steel insert in the form of a flat contact member which is secured in place by being pinched between opposed wall areas of flanges of the rail member, in consequence of the flanges being swaged or displaced beyond their elastic limit to effect a gripping of the contact member. The inner walls of the flanges, which adjoin the elongate contact member, constitute metal guideways that assure a positive tracking of the collector shoe. Any small relative movements between the conducting rail member and the stainless steel insert, as occasioned by temperature changes for example, cannot result in loosening of the insert or deterioration of the electrical conductance thereto. The rail member can be provided with a skin-tight jacket of insulation that is coextensive with the member and capable of accommodating mounting clamps at any desired locations.

Inventors

  • 👤 Alleyne C. Howell, Jr.

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 14:06
CPC Classifications
B; B60; B60M; B60M1/00; B60M1/30; B60M1/34; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49915

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 114 words
A rail construction for rail-type electrification systems, comprising in combination: a. a pair of rail members having abutting end portions provided with T-slots, b. a connection strip bridging said abutting end portions, c. bolts passing into the T-slots of said end portions and through the connection strip, for securing the rail members to each other in end-to-end relation, d. the heads of said bolts being disposed in said T-slots, and e. resilient, bowed washer means located in the T-slots under the bolt heads, said washer means being secured to enable it to bow more or less due to unequal expansion and contraction of the bolts as compared with the rail members and connection strip.
Claim 2
Dependent Claim 114 words
A rail construction for rail-type electrification systems, comprising in combination: a. a pair of rail members having abutting end portions provided with T-slots, b. a connection strip bridging said abutting end portions, c. bolts passing into the T-slots of said end portions and through the connection strip, for securing the rail members to each other in end-to-end relation, d. the heads of said bolts being disposed in said T-slots, and e. resilient, bowed washer means located in the T-slots under the bolt heads, said washer means being secured to enable it to bow more or less due to unequal expansion and contraction of the bolts as compared with the rail members and connection strip.
Claim 3
Dependent Claim 29 words
The rail construction as defined in claim 1, wherein: a. the bowed washer means comprises an elongate resilient strip having a plurality of apertures through which the bolts extend.
Claim 4
Dependent Claim 47 words
The rail construction as defined in claim 2, wherein: a. the elongate resilient strip has a width sufficiently great to substantially fill the T-slot, such that when the elongate resilient strip is flatened by tightening the bolts, there is effected a precise alignment of the rail members.
Claim 5
Dependent Claim 57 words
The rail construction as defined in claim 3, wherein: a. the concave surface of the resilient strip faces the opening of the T-slot of one of the rail members, b. said bolts having spring lock washers disposed against the connection strip, c. said lock washers being under continual tension and tending to flatten the elongate resilient strip.

References Cited (Backward Citations)

US1746201A Cited
CH215542A Cited
US2640114A Cited
US2882376A Cited
US2820084A Cited
US3590173A Cited
US3892299A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1979-12-21 1980-06-21 1980-12-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1983-12-21 1984-06-21 1984-12-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1987-12-21 1988-06-21 1988-12-21 $7700.00 Window Closed / Lapsed

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