US3918683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-hydraulic jack
Assignee: Individual
•
Filing: 1974-01-09
•
Granted: 1975-11-11
•
Expires: 1994-01-09
Abstract
Abstract A jack intended for use with automobiles including a compact, easily positioned jack assembly, a hydraulic power unit connected to the jack assembly, and means for electrically operating the hydraulic power unit. The jack assembly has a head support that will adapt to use with a bumper or that will provide a ram head to be used under axles and the like.
Inventors
- 👤 Daniel J Millar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:17
CPC Classifications
B; B66; B66F; B66F3/00; B66F3/24; B66F3/44
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
193 words
An electro-hydraulic jack comprising a jack assembly having telescoping body sections and a ram adapted to project therefrom as the outermost extending body section, and an enlarged bearing surface on the end of the ram projecting from the body; a power unit including a housing, a reservoir in the housing, oil in the reservoir, a pump in the reservoir, an electric motor in the housing, means coupling said motor to said pump whereby operation of the motor operates said pump to pump said oil, said means including a shaft extending through the reservoir and connected to an output of the motor, a crank shaft having a principal axis extending parallel to the shaft, gear means interconnecting the shaft and the principal axis of the crank shaft, and a link pivotally connected to the eccentric of the crank shaft and to a piston of the pump; flexible conduit means including one-way valve means, interconnecting the pump and the interior of the jack assembly; flexible conduit means interconnecTing the interior of the jack assembly and the reservoir; and control valve means in the conduit means interconnecting the interior of said jack assembly and said reservoir.
Claim 2
Dependent Claim
193 words
An electro-hydraulic jack comprising a jack assembly having telescoping body sections and a ram adapted to project therefrom as the outermost extending body section, and an enlarged bearing surface on the end of the ram projecting from the body; a power unit including a housing, a reservoir in the housing, oil in the reservoir, a pump in the reservoir, an electric motor in the housing, means coupling said motor to said pump whereby operation of the motor operates said pump to pump said oil, said means including a shaft extending through the reservoir and connected to an output of the motor, a crank shaft having a principal axis extending parallel to the shaft, gear means interconnecting the shaft and the principal axis of the crank shaft, and a link pivotally connected to the eccentric of the crank shaft and to a piston of the pump; flexible conduit means including one-way valve means, interconnecting the pump and the interior of the jack assembly; flexible conduit means interconnecTing the interior of the jack assembly and the reservoir; and control valve means in the conduit means interconnecting the interior of said jack assembly and said reservoir.
Claim 3
Dependent Claim
59 words
An electro-hydraulic jack as in claim 1, wherein the gear means interconnecting the shaft and the principal axis of the crank shaft comprises a first spur gear fixed to the shaft; a second spur gear fixed to the principal axis of the crank shaft; and a ring gear surrounding and in mesh with the first and second spur gears.
Claim 4
Dependent Claim
37 words
An electro-hydraulic jack as in claim 2, wherein the pump comprises a sleeve fixed to and projecting inwardly from a wall of the housing; ports in the sleeve; and a piston mounted to reciprocate in the sleeve.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |