Patent US3756439A successfully refreshed from Google Patents.
US3756439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boat trailer support
Assignee: Individual
•
Filing: 1971-10-19
•
Granted: 1973-09-04
•
Expires: 1991-10-19
Abstract
Abstract In a boat trailer having pivotally supported pairs of hull support means, a torsion member interconnecting the said pairs and yieldably urging them toward parallelism.
Inventors
- 👤 L Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:46
CPC Classifications
B; B60; B60P; B60P3/00; B60P3/06; B60P3/10; B60P3/1033; B60P3/1066
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
156 words
In a boat trailer having a rigid wheel-supported frame adapted for releasably connecting to a towing vehicle and a pair of longitudinal members supported on said frame for independent pivotal rotation about a substantially common transverse axis adjacent to the rear end of said frame; said longitudinal members each being pivotally mounted intermediate its ends in substantially identical fashion and extending rearwardly of said frame an equal distance to the other; a pair of lateral arms mounted intermediate their lengths one at each end of each said longitudinal member and independently rockable about an axis parallel to the longitudinal member on which it is mounted; a roller journaled at each end of each arm and disposed to contact the hull of a boat being drawn in a forward direction relative to said frame; the improvement, comprising: an interconnecting member yieldably urging said pair of longitudinal members toward parallelism and yieldable to predetermined force to effect misalignment.
Claim 2
Dependent Claim
156 words
In a boat trailer having a rigid wheel-supported frame adapted for releasably connecting to a towing vehicle and a pair of longitudinal members supported on said frame for independent pivotal rotation about a substantially common transverse axis adjacent to the rear end of said frame; said longitudinal members each being pivotally mounted intermediate its ends in substantially identical fashion and extending rearwardly of said frame an equal distance to the other; a pair of lateral arms mounted intermediate their lengths one at each end of each said longitudinal member and independently rockable about an axis parallel to the longitudinal member on which it is mounted; a roller journaled at each end of each arm and disposed to contact the hull of a boat being drawn in a forward direction relative to said frame; the improvement, comprising: an interconnecting member yieldably urging said pair of longitudinal members toward parallelism and yieldable to predetermined force to effect misalignment.
Claim 3
Dependent Claim
24 words
The invention defined in claim 1 wherein said member comprises a yieldable torsion bar interconnecting each longitudinal member to the other of said pair.
Claim 4
Dependent Claim
56 words
The invention defined in claim 2 wherein said torsion member comprises: a torque member having radially disposed brackets fixed at the ends of said torque member; means loosely attaching said brackets to said pair of longitudinal members; and spring biased centering means yieldably holding said brackets midway their movement limits with respect to each longitudinal member.
Claim 5
Dependent Claim
44 words
The invention defined in claim 3 wherein the means loosely attaching each bracket to the longitudinal member comprises an elongate bolt extending through a loose fitting aperture in said bracket; and a compression spring confined by said bolt and exerting pressure upon said bracket.
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) | 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 |