US3839826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power or manually operable gate
Assignee: Individual
•
Filing: 1973-05-15
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Granted: 1974-10-08
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Expires: 1993-05-15
Abstract
Abstract A rectangular gate is mounted to pivot, in a vertical plane, about an axis at a lower corner of the gate, a first spring urges the gate toward open position and a second spring acts, as the gate approaches open position, to resist the action of the first spring. The pivot for the gate is a horizontal, selectively power driven, shaft and the gate is mounted on the shaft by a splitband adjustable friction clutch so that the gate may be opened or closed manually or by power means, selectively.
Inventors
- 👤 R Ries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:14
CPC Classifications
E; E06; E06B; E06B11/00; E06B11/02; E06B11/022; E06B11/023; E05; E05F; E05F1/00; E05F1/08; E05F1/10; E05F1/1041; E05F1/1066; E05F1/1075; E05Y; E05Y2900/00; E05Y2900/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
176 words
A generally rectangular substantially rigid gate frame lying in a generally vertical plane; pivot means supporting said gate frame for pivotal movement about a generally horizontal fixed axis perpendicular to the plane of said frame and at a lower corner at one end thereof, said gate frame being movable about said pivot means between a closed position where its center of gravity is on one side of said axis and an open position where its center of gravity is on the other side of said axis; tension spring means urging said gate from said closed position toward said open position; and torsion spring means mounted adjacent said axis and having an arm extending into the path of movement of a portion of said gate frame and spaced therefrom when said gate is closed but engageable by said gate substantially before said center of gravity reaches a position over said axis and arranged to resist the urging of said tension spring as the center of gravity of said gate approaches and passes a position above said axis.
Claim 2
Dependent Claim
176 words
A generally rectangular substantially rigid gate frame lying in a generally vertical plane; pivot means supporting said gate frame for pivotal movement about a generally horizontal fixed axis perpendicular to the plane of said frame and at a lower corner at one end thereof, said gate frame being movable about said pivot means between a closed position where its center of gravity is on one side of said axis and an open position where its center of gravity is on the other side of said axis; tension spring means urging said gate from said closed position toward said open position; and torsion spring means mounted adjacent said axis and having an arm extending into the path of movement of a portion of said gate frame and spaced therefrom when said gate is closed but engageable by said gate substantially before said center of gravity reaches a position over said axis and arranged to resist the urging of said tension spring as the center of gravity of said gate approaches and passes a position above said axis.
Claim 3
Dependent Claim
19 words
A gate as defined in claim 1 including adjusting means for selectively adjusting the tension of said tension spring.
Claim 4
Dependent Claim
57 words
A gate as defined in claim 2 wherein said tension spring is anchored at one end, outwardly of said one end of said frame and extends upwardly therefrom toward said frame, said adjusting means comprising means for connecting the upper end of said tension spring to said frame at a selected one of a plurality of positions.
Claim 5
Dependent Claim
57 words
A gate as defined in claim 1 wherein said torsion spring means includes an anchored torsion spring coil having an upwardly extending arm spaced outwardly of said one end of said frame when said gate is in closed position but being engageable by said frame, as it swings toward open position, to energize said torsion spring coil.
Claim 6
Dependent Claim
71 words
A gate as defined in claim 1 wherein said pivot means comprises a horizontal shaft at said axis and friction clutch means journalling said gate frame on said shaft; selectively operable power driven means for rotating said shaft whereby said gate may be pivoted between open and closed positions either by said power driven means through said friction clutch or manually by causing said friction clutch to slip on said shaft.
Claim 7
Dependent Claim
47 words
A gate as defined in claim 5 wherein said friction clutch means comprises a resilient band secured to said frame and extending around said shaft in frictional engagement therewith, spring means for tensioning said band, and means for selectively adjusting the force of said last-named spring means.
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) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |