US3888464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Independent jacking system for vehicles and the like
Assignee: Individual
•
Filing: 1974-05-07
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Granted: 1975-06-10
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Expires: 1994-05-07
Abstract
Abstract A reversible electric motor and screw type jack assembly is secured to the vehicle frame adjacent each wheel and can be actuated separately or cojointly from a control box which can be fixed or can be moved to a position externally of the vehicle. Each screw type jack assembly includes a reduction gear and an elongated screw having a nut engaged therearound. A worm drive from the reduction gear engages the nut and as the screw is prevented from rotation, the screw extends or retracts from the housing which is secured to the frame member of the vehicle. A limit switch assembly is provided and the device is designed so that the motor and the switch assembly are interchangeable so that the device can be assembled for use on the right or left side of the vehicle.
Inventors
- 👤 Karl H Felsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:24
CPC Classifications
B; B66; B66F; B66F3/00; B66F3/08; B66F3/18; B66F3/44
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
322 words
A jacking device for vehicles and the like which include a longitudinally extending frame member and a source of electrical energy; comprising in combination means to secure said device to the frame member, a gear box enclosure secured to said means, a reversible electric motor secured to one side of said enclosure and being selectively connectable to said source of electrical energy, an elongated jack screw extending vertically through said gear box, means to support said screw for vertical extending and retracting movement relative to said gear box, means to inhibit rotation of said jack screw within said gear box, a jack shoe on the lower end of said jack screw, and worm and nut drive means within said gear box operatively connected between jack screw and said electric motor, a synchronized limit switch assembly secured to the other side of said gear box for disconnecting said electric motor from said source of electrical energy at the upper and lower limits of travel of said jack screw, said worm and nut drive means including a worm gear, a worm gear shaft journalled for rotation within said gear box and a nut screw threadably engaging around said jack screw and being engaged by said worm gear, said nut including bearing support means within said gear box, and constituting said means for supporting said jack screw, said limit switch assembly including a casing, a limit switch screw shaft journalled for rotation within said casing, gear means connecting said worm gear shaft with said limit switch screw shaft, a non-rotatable nut engaged around said limit switch screw shaft for travel therealong when said shaft is rotated, and upper and lower limit switches in said casing operated by said last mentioned nut when said nut is at the upper and lower limits of travel upon said limit switch screw shaft, said limit switches being operatively connected between said source of electrical energy and said electric motor.
Claim 2
Dependent Claim
322 words
A jacking device for vehicles and the like which include a longitudinally extending frame member and a source of electrical energy; comprising in combination means to secure said device to the frame member, a gear box enclosure secured to said means, a reversible electric motor secured to one side of said enclosure and being selectively connectable to said source of electrical energy, an elongated jack screw extending vertically through said gear box, means to support said screw for vertical extending and retracting movement relative to said gear box, means to inhibit rotation of said jack screw within said gear box, a jack shoe on the lower end of said jack screw, and worm and nut drive means within said gear box operatively connected between jack screw and said electric motor, a synchronized limit switch assembly secured to the other side of said gear box for disconnecting said electric motor from said source of electrical energy at the upper and lower limits of travel of said jack screw, said worm and nut drive means including a worm gear, a worm gear shaft journalled for rotation within said gear box and a nut screw threadably engaging around said jack screw and being engaged by said worm gear, said nut including bearing support means within said gear box, and constituting said means for supporting said jack screw, said limit switch assembly including a casing, a limit switch screw shaft journalled for rotation within said casing, gear means connecting said worm gear shaft with said limit switch screw shaft, a non-rotatable nut engaged around said limit switch screw shaft for travel therealong when said shaft is rotated, and upper and lower limit switches in said casing operated by said last mentioned nut when said nut is at the upper and lower limits of travel upon said limit switch screw shaft, said limit switches being operatively connected between said source of electrical energy and said electric motor.
Claim 3
Dependent Claim
83 words
The device according to claim 1 which includes a reduction gear assembly in said gear box, said reduction gear assembly including a first gear driven by said electric motor and a second gear driven by said first gear, said second gear being detachably secured to one end of said worm gear shaft, said limit switch assembly being operatively connected to the other end of said worm gear shaft, said electric motor and said reduction gear assembly being interchangeable with said limit switch Assembly.
Claim 4
Dependent Claim
129 words
The device according to claim 1 which includes a screw enclosure extending upwardly from said gear box, said means to inhibit rotation of said jack screw being situated within said screw enclosure, said jack shoe being mounted for limited universal movement upon the lower end of said jack screw, and a lower end enclosure secured to and extending downwardly from said gear box and receiving the said lower end of said jack screw, the upper side of said jack shoe and the universal connection therebetween when said jack screw is in the fully retracted position, and means on the lower end of said lower end enclosure co-operating with said jack shoe to seal off said lower end enclosure and protect the parts therein from dust, moisture and the like.
Claim 5
Dependent Claim
129 words
The device according to claim 2 which includes a screw enclosure extending upwardly from said gear box, said means to inhibit rotation of said jack screw being situated within said screw enclosure, said jack shoe being mounted for limited universal movement upon the lower end of said jack screw, and a lower end enclosure secured to and extending downwardly from said gear box and receiving the said lower end of said jack screw, the upper side of said jack shoe and the universal connection therebetween when said jack screw is in the fully retracted position, and means on the lower end of said lower end enclosure co-operating with said jack shoe to seal off said lower end enclosure and protect the parts therein from dust, moisture and the like.
Claim 6
Dependent Claim
71 words
The device according to claim 1 in which said means to inhibit rotation of said jack screw includes a jack screw guide stabilizer within said screw enclosure, said stabilizer being secured to the upper end of said jack screw, and means co-operating between said stabilizer and said enclosure whereby said stabilizer moves up and down said enclosure as said jack screw retracts and extends in a non-rotatable relationship with said tube.
Claim 7
Dependent Claim
71 words
The device according to claim 2 in which said means to inhibit rotation of said jack screw includes a jack screw guide stabilizer within said screw enclosure, said stabilizer being secured to the upper end of said jack screw, and means co-operating between said stabilizer and said enclosure whereby said stabilizer moves up and down said enclosure as said jack screw retracts and extends in a non-rotatable relationship with said tube.
Claim 8
Dependent Claim
71 words
The device according to claim 3 in which said means to inhibit rotation of said jack screw includes a jack screw guide stabilizer within said screw enclosure, said stabilizer being secured to the upper end of said jack screw, and means co-operating between said stabilizer and said enclosure whereby said stabilizer moves up and down said enclosure as said jack screw retracts and extends in a non-rotatable relationship with said tube.
Claim 9
Dependent Claim
71 words
The device according to claim 4 in which said means to inhibit rotation of said jack screw includes a jack screw guide stabilizer within said screw enclosure, said stabilizer being secured to the upper end of said jack screw, and means co-operating between said stabilizer and said enclosure whereby said stabilizer moves up and down said enclosure as said jack screw retracts and extends in a non-rotatable relationship with said tube.
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) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |