US4078816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically driven two-wheeled pedicab
Assignee: Individual
•
Filing: 1976-05-24
•
Granted: 1978-03-14
•
Expires: 1996-05-24
Abstract
Abstract A hydraulically driven, two-wheeled pedicab constructed with an enclosed cockpit for inclined positioning of a solo rider. The pedicab includes a reciprocating piston pump hydraulically connected to a hydraulic, rotary motor for powering at least one of the wheels, and, a power reserve having a rotary converter for selectively converting hydraulic fluid energy into a stored, compressed gas potential energy, the stored energy being selectively cycled into fluid energy when desired for assisting in the propulsion of the pedicab.
Inventors
- 👤 Michael Sean Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:38
CPC Classifications
B; B62; B62M; B62M19/00; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20732; Y10T74/2078; Y10T74/20822
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
208 words
A pedicab comprising: a vehicle having wheels, a steering mechanism, a hydraulic master pump with means for foot operation of said master pump, a hydraulic drive motor hydraulically connected to said master pump and mechanically connected to at least one of said wheels of said vehicle for powering said vehicle, and, converter means cooperating with said hydraulic drive motor and said hydraulic pump for converting and storing energy and selectively releasing said energy for assisting said powering of the vehicle wherein said drive motor is operable selectively as a motor or pump, said converter means including a hydraulic pump-motor hydraulically coupled to said hydraulic drive motor; an air compressor-motor mechanically coupled to said hydraulic pump-motor, air storage means connected to said compressor-motor for storing and releasing air through said compressor-motor; and valve control means for selective operation of said converter means, said valve control means having first means for selectively operating said hydraulic pump-motor as a motor and concurrently operating said air compressor-motor as a compressor, and second means for selectively operating said hydraulic pump-motor as a pump and said air compressor-motor as a motor; wherein said hydraulic drive motor, said hydraulic pump-motor and said hydraulic compressor-motor comprise Wankel-type rotary units operable selectively as a pump or motor.
Claim 2
Dependent Claim
208 words
A pedicab comprising: a vehicle having wheels, a steering mechanism, a hydraulic master pump with means for foot operation of said master pump, a hydraulic drive motor hydraulically connected to said master pump and mechanically connected to at least one of said wheels of said vehicle for powering said vehicle, and, converter means cooperating with said hydraulic drive motor and said hydraulic pump for converting and storing energy and selectively releasing said energy for assisting said powering of the vehicle wherein said drive motor is operable selectively as a motor or pump, said converter means including a hydraulic pump-motor hydraulically coupled to said hydraulic drive motor; an air compressor-motor mechanically coupled to said hydraulic pump-motor, air storage means connected to said compressor-motor for storing and releasing air through said compressor-motor; and valve control means for selective operation of said converter means, said valve control means having first means for selectively operating said hydraulic pump-motor as a motor and concurrently operating said air compressor-motor as a compressor, and second means for selectively operating said hydraulic pump-motor as a pump and said air compressor-motor as a motor; wherein said hydraulic drive motor, said hydraulic pump-motor and said hydraulic compressor-motor comprise Wankel-type rotary units operable selectively as a pump or motor.
Claim 3
Dependent Claim
26 words
The pedicab of claim 1 wherein said master pump comprises a reciprocal pump with valve means for controlled pumping of fluid to said hydraulic drive motor.
Claim 4
Dependent Claim
19 words
The pedicab of claim 1 wherein said vehicle has an inclined seat and backrest and a substantially enclosed cab.
Claim 5
Dependent Claim
35 words
The pedicab of claim 3 wherein said vehicle has a frame comprising a contoured, reinforced core forming in part said inclined seat and backrest, and lightweight, streamlined shell with a transparent canopy forming said cab.
Claim 6
Dependent Claim
43 words
The pedicab of claim 2 wherein said means for foot operation of said pump comprises foot pedal cranks having mechanical connectors connecting said cranks to said hydraulic master pump, said cranks having means for adjusting the operating torque to a relatively constant level.
Claim 7
Dependent Claim
30 words
The pedicab of claim 5 wherein said reciprocal master pump includes at least one piston and said mechanical connectors of said foot pedal cranks to said pump comprises a cable.
References Cited (Backward Citations)
US576538A
Cited
US602618A
Cited
CH7771A
Cited
US636184A
Cited
US735628A
Cited
US1410326A
Cited
US2137574A
Cited
US2177381A
Cited
GB674967A
Cited
FR1050228A
Cited
US3922005A
Cited
US3834733A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |