Patent US3918557A successfully refreshed from Google Patents.
US3918557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trolley electrical collector
Assignee: US SAFETY TROLLEY CORP
•
Filing: 1974-11-07
•
Granted: 1975-11-11
•
Expires: 1994-11-07
Abstract
Abstract An elongated metal trolley shoe has a groove in one side extending from end to end for receiving a trolley wire, with the opposite side of the shoe provided with threaded holes having their inner ends spaced from the groove. Screws in the holes for attaching the shoe to a support are made of a material that is at least as soft as the shoe, so that if the portion of the shoe originally separating its groove from the inner ends of the screws is worn away by a trolley wire, further wear of the shoe will occur in the same direction because the screws will wear at the same rate instead of forcing the wire to wear into the side of the groove.
Inventors
- 👤 Sr Donald R Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:44
CPC Classifications
B; B60; B60L; B60L5/00; B60L5/04; B60L5/08; B60L2200/00; B60L2200/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
124 words
In a trolley electrical collector comprising an elongated metal shoe having a groove in one side extending from end to end of the shoe for receiving a trolley wire, the opposite side of the shoe being provided with longitudinally spaced threaded holes having their inner ends spaced from said groove, and screws in said holes for attaching the shoe to a support; the screws being made of a metal that is at least as soft as the shoe, whereby if the portion of the shoe originally separating said groove from the inner ends of the screws is worn away by a trolley wire, further wear of the shoe will occur in the same direction accompanied by wear of the screws at the same rate.
Claim 2
Dependent Claim
124 words
In a trolley electrical collector comprising an elongated metal shoe having a groove in one side extending from end to end of the shoe for receiving a trolley wire, the opposite side of the shoe being provided with longitudinally spaced threaded holes having their inner ends spaced from said groove, and screws in said holes for attaching the shoe to a support; the screws being made of a metal that is at least as soft as the shoe, whereby if the portion of the shoe originally separating said groove from the inner ends of the screws is worn away by a trolley wire, further wear of the shoe will occur in the same direction accompanied by wear of the screws at the same rate.
Claim 3
Dependent Claim
22 words
In a trolley electrical collector according to claim 1, in which said shoe is harder than aluminum, and said screws are aluminum.
Claim 4
Dependent Claim
29 words
In a trolley electrical collector according to claim 1, in which said shoe is made from a mixture of sintered powdered copper and graphite, and said screws are aluminum.
References Cited (Backward Citations)
US2830138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |