US3893533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recreational vehicle
Assignee: Individual
•
Filing: 1974-01-25
•
Granted: 1975-07-08
•
Expires: 1994-01-25
Abstract
Abstract A tandem wheel motor vehicle of highly simplified and economical construction is particularly useful on rough terrain but may also be used for personal transportation in urban areas. The vehicle features selectively engageable front and rear wheel drives through direct drive shafts from a centrally located engine. Dual front and rear wheels provide added traction and stability. A high strength, lightweight frame possesses enough resiliency to eliminate the need for springs. Upper and lower frame sections have swiveled connections on longitudinal horizontal axes allowing the riders'' seat and steering means to remain level while the vehicle wheels tilt laterally as when cornering or following a hillside.
Inventors
- 👤 Hubert Tidwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:15
CPC Classifications
B; B62; B62K; B62K5/00; B62K5/10; B62K5/01
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
208 words
A vehicle comprising forward and rear dual wheel assemblies, a lower vehicle frame section and a separately formed upper frame section, a yoke including a generally upright steering shaft bearing, a longitudinal axis swivel bearing carried by the bottom of the yoke and rotatably receiving the forward end of said lower frame section, means forming a transverse axis pivotal connection between the rear extremity of the lower frame section and the rear end of the upper frame section, an engine mounted on the lower frame section between said forward and rear dual wheel assemblies, fore and aft longitudinal drive shafts connected with and driven by the engine and drivingly connected with said forward and rear dual wheel assemblies, a front steering fork for the vehicle including an upper shaft portion engaged rotatably within said steering shaft bearing and also including a lower longitudinal axis forward extension, a forward bracket carrying the forward dual wheel assembly rotatably and having a lower end longitudinal axis swivel bearing rotatably receiving said lower longitudinal axis forward extension, a rear bracket carrying the rear dual wheel assembly rotatably and having a lower end longitudinal axis swivel bearing rotatably receiving said lower vehicle frame section, and a seat carried by said upper frame section.
Claim 2
Dependent Claim
208 words
A vehicle comprising forward and rear dual wheel assemblies, a lower vehicle frame section and a separately formed upper frame section, a yoke including a generally upright steering shaft bearing, a longitudinal axis swivel bearing carried by the bottom of the yoke and rotatably receiving the forward end of said lower frame section, means forming a transverse axis pivotal connection between the rear extremity of the lower frame section and the rear end of the upper frame section, an engine mounted on the lower frame section between said forward and rear dual wheel assemblies, fore and aft longitudinal drive shafts connected with and driven by the engine and drivingly connected with said forward and rear dual wheel assemblies, a front steering fork for the vehicle including an upper shaft portion engaged rotatably within said steering shaft bearing and also including a lower longitudinal axis forward extension, a forward bracket carrying the forward dual wheel assembly rotatably and having a lower end longitudinal axis swivel bearing rotatably receiving said lower longitudinal axis forward extension, a rear bracket carrying the rear dual wheel assembly rotatably and having a lower end longitudinal axis swivel bearing rotatably receiving said lower vehicle frame section, and a seat carried by said upper frame section.
Claim 3
Dependent Claim
39 words
The structure of claim 1, and drive gear units for the forward and rear dual wheel assemblies coupled with the axles thereof, and drive gears on said fore and aft drive shafts operatively engaged with said drive gear units.
Claim 4
Dependent Claim
29 words
The structure of claim 2, and said drive gears on said fore and aft drive shafts comprising worms, said drive gear units having worm gears engaged with said worms.
Claim 5
Dependent Claim
40 words
The structure of claim 1, and said lower vehicle frame section being divided at said lower end longitudinal axis swivel bearing of said rear bracket with said rear extremity of the lower frame section rotatably engaged in said swivel bearing.
Claim 6
Dependent Claim
29 words
The structure of claim 1, and short suspension shackle means pivotally interconnecting the forward end of the upper vehicle frame section with said yoke through said steering shaft bearing.
References Cited (Backward Citations)
US1107990A
Cited
US2187238A
Cited
US2375046A
Cited
US2863672A
Cited
US2913255A
Cited
US3199623A
Cited
US3605929A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |