Patent US3755977A successfully refreshed from Google Patents.
US3755977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frangible lighting pole
Assignee: Powerlite Devices Ltd
•
Filing: 1971-10-29
•
Granted: 1973-09-04
•
Expires: 1991-10-29
Abstract
Abstract This invention relates to a pole for mounting a lighting fixture that has a frangible section close to the ground level that is adapted to break upon impact by an automobile as a safety measure. The principal feature of the invention is the provision of a tubular coupling member interconnecting upper and lower sections. The lower section is driven into the ground; the upper section elevates the lighting fixture, and the tubular section is designed to break in response to the lateral impact force of an automobile.
Inventors
- 👤 T Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:04
CPC Classifications
E; E04; E04H; E04H12/00; E04H12/003; E01; E01F; E01F9/00; E01F9/60; E01F9/623; E01F9/631; E01F9/638
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
56 words
A pole as claimed in claim 4, in which the inside surface of said coupling member is provided with a pair of annular recesses surrounding the lower end of said uppermost member and the upper end of said lowermost member, said recesses being filled with an adhesive for bonding said coupling member to said other members.
Claim 2
Dependent Claim
18 words
A pole as claimed in claim 1, in which said coupling member is welded to said other members.
Claim 3
Dependent Claim
31 words
A pole as claimed in claim 2, in which said uppermost and lowermost members are formed of wrought aluminum, said coupling member being formed of a relatively brittle cast aluminum alloy.
Claim 4
Dependent Claim
217 words
A pole for mounting a lighting fixture or the like beside a roadway, said pole comprising a lowermost member to be sunk into the ground, an uppermost member for carrying the fixture involved, and a yieldable tubular coupling member in telescoping relation with said uppermost member and in telescoping relation with said lowermost member whereby to interconnect said uppermost and lowermost members, said coupling member having a strength adapted to yield and cause the coupling member to break in response to a lateral impact force of predetermined magnitude applied thereto or to said uppermost and lowermost members adjacent said coupling member, said uppermost member being press fitted within the top end of said coupling member, the bottom end of the coupling member being press fitted over the upper end of the lowermost member, the lower end of the uppermost member and the upper end of the lowermost member being spaced from one another within said coupling member, said coupling member carrying a pair of spaced, annular shoulders on its inside surface, the lower end of said uppermost member being abutted against one of said shoulders, the upper end of said lowermost member being abutted against the other of said shoulders, said coupling member being provided with an inspection access opening, said opening having a removable cover plate.
Claim 5
Dependent Claim
217 words
A pole for mounting a lighting fixture or the like beside a roadway, said pole comprising a lowermost member to be sunk into the ground, an uppermost member for carrying the fixture involved, and a yieldable tubular coupling member in telescoping relation with said uppermost member and in telescoping relation with said lowermost member whereby to interconnect said uppermost and lowermost members, said coupling member having a strength adapted to yield and cause the coupling member to break in response to a lateral impact force of predetermined magnitude applied thereto or to said uppermost and lowermost members adjacent said coupling member, said uppermost member being press fitted within the top end of said coupling member, the bottom end of the coupling member being press fitted over the upper end of the lowermost member, the lower end of the uppermost member and the upper end of the lowermost member being spaced from one another within said coupling member, said coupling member carrying a pair of spaced, annular shoulders on its inside surface, the lower end of said uppermost member being abutted against one of said shoulders, the upper end of said lowermost member being abutted against the other of said shoulders, said coupling member being provided with an inspection access opening, said opening having a removable cover plate.
References Cited (Backward Citations)
US1517677A
Cited
US1883467A
Cited
US3307833A
Cited
US3349531A
Cited
US3355998A
Cited
US3550637A
Cited
US3623286A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |