Patent US3840210A successfully refreshed from Google Patents.
US3840210A
Expired / Lapsed
US
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Skid jack for mobile homes
Assignee: Individual
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Filing: 1973-06-05
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Granted: 1974-10-08
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Expires: 1993-06-05
Abstract
Abstract This is a skid jack for mobile or trailer homes. It consists of a substantially rectangular frame having mobility provided by a pair of castor wheels and a pair of power wheels on an axle having a slip clutch so that it can be steered. The entire jack as assembled is of substantial size, weighing about 1,800 or 2,000 pounds. The wheels are only for providing mobility in properly positioning the jack under the mobile home, and are retracted so that the frame is based on the ground directly. Hydraulic power means is provided for the various operations, including powering the wheels, lifting a support rail against the bottom of a mobile home to lift it up, skidding the supported mobile home up to twelve inches at a time. Separately controlled hydraulic means are provided for lifting, supporting and lowering each end of the support rail. The procedure is repeated often as necessary according to the distance it must be moved. The castor wheels may be latched against castoring to move the jack in a straight line. A separate hydraulic cylinder is provided for raising or lowering the four wheels simultaneously, another cylinder for skidding the support rail, another for lifting one side, another for lifting the other side and hydraulic means are provided for power in the wheels. A separate valve is provided for each cylinder, the valve being controllable for operating in both directions, as well as for locking the part against operation.
Inventors
- 👤 R Hollingsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:02
CPC Classifications
B; B66; B66F; B66F7/00; B66F7/06; B66F7/0633; B66F7/0625; B66F7/08; B66F7/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
386 words
A skid jack (9) for mobile homes and the like, said jack (9) comprising a rectangular frame (29), a channel member (13) rigidly fixed on said frame along the approximate elongate central line thereof, a skid channel member (11) slidably reciprocable within said frame channel member (13), an inverted channel load support rail (48), a slidable top travel shoe (68) extending into each bottom end of said inverted channel rail (48), means (71) slidably retaining said slidable top shoes (68) in position in said rail (48), each top travel shoe (68) having depending clevis eye means (69), a lifting linkage rod member (38 or 39) having a knee portion (101), a clevis pin (70) pivotally securing said knee portion (101) to said depending clevis eye means (69), a second clevis pin (61 or 62) pivotally securing the bottom end of said lifting linkage rod (38) to a base post (46 or 47) fixedly secured to said skid member (11), a pusher rod (36 or 37) pivotally secured by clevis pin means (66 or 67) at its top end to said depending clevis eye means (69) of said top slidable travel shoe (68) and at its bottom end by a clevis pin (40 or 41) to an upwardly extending clEvis eye means (34 or 35) of a travel shoe (14 or 15), means (90, 114) slidably retaining said bottom travel shoe (14) in said skid channel member (11), means (89, 111) slidably retaining said skid channel member (11) in said rigid channel member (13), knee-jointed stabilizer legs (42, 43 or 44, 45) pivotally (61 or 62) secured to each said base posts (46 or 47) and to said inverted channel top load-support rail (48), a base post (52) fixed relative to said frame (29), push and pull means (12) operatively biased between said fixed base post (52) and one said skid base post (46) for controllably sliding said skid channel member (11) within said rigid channel member (13), and separate push and pull means (16 or 17) for each lower travel shoe biased thereagainst and against a base abutment (96) fixed relative to said skid 11 for controllably raising, holding and lowering said load-support rail, and skid jack wheel means (18, 19) retractable relative to and extendable below said frame (29) providing mobility for said jack (9).
Claim 2
Dependent Claim
386 words
A skid jack (9) for mobile homes and the like, said jack (9) comprising a rectangular frame (29), a channel member (13) rigidly fixed on said frame along the approximate elongate central line thereof, a skid channel member (11) slidably reciprocable within said frame channel member (13), an inverted channel load support rail (48), a slidable top travel shoe (68) extending into each bottom end of said inverted channel rail (48), means (71) slidably retaining said slidable top shoes (68) in position in said rail (48), each top travel shoe (68) having depending clevis eye means (69), a lifting linkage rod member (38 or 39) having a knee portion (101), a clevis pin (70) pivotally securing said knee portion (101) to said depending clevis eye means (69), a second clevis pin (61 or 62) pivotally securing the bottom end of said lifting linkage rod (38) to a base post (46 or 47) fixedly secured to said skid member (11), a pusher rod (36 or 37) pivotally secured by clevis pin means (66 or 67) at its top end to said depending clevis eye means (69) of said top slidable travel shoe (68) and at its bottom end by a clevis pin (40 or 41) to an upwardly extending clEvis eye means (34 or 35) of a travel shoe (14 or 15), means (90, 114) slidably retaining said bottom travel shoe (14) in said skid channel member (11), means (89, 111) slidably retaining said skid channel member (11) in said rigid channel member (13), knee-jointed stabilizer legs (42, 43 or 44, 45) pivotally (61 or 62) secured to each said base posts (46 or 47) and to said inverted channel top load-support rail (48), a base post (52) fixed relative to said frame (29), push and pull means (12) operatively biased between said fixed base post (52) and one said skid base post (46) for controllably sliding said skid channel member (11) within said rigid channel member (13), and separate push and pull means (16 or 17) for each lower travel shoe biased thereagainst and against a base abutment (96) fixed relative to said skid 11 for controllably raising, holding and lowering said load-support rail, and skid jack wheel means (18, 19) retractable relative to and extendable below said frame (29) providing mobility for said jack (9).
Claim 3
Dependent Claim
61 words
The skid jack of claim 1, said means for slidably retaining said slidable top and bottom travel shoes and said skid channel member in their respective channel members comprising guide bars (71, 90) secured within said respective channel members (48, 11) and cooperating webs (141 and 111) on said travel shoes (14 and 15) and on said skid channel member (11).
Claim 4
Dependent Claim
68 words
The skid jack of claim 2, said lower travel shoe retainer guide bars (90) within said skid channel member (11) being spaced from the bottom thereof, said skid channel member retainer guide bars (89) within said base channel member (13) being spaced from the inside bottom thereof and said upper travel shoe retainer guide bars (71) being secured to depending side walls from said load support rail (48).
Claim 5
Dependent Claim
19 words
The skid jack of claim 1, said push and pull means comprising hydraulic cylinder (12) and piston means (121).
Claim 6
Dependent Claim
60 words
The skid jack of claim 1, said wheel means including a pair of power receiving wheels (18), a power axle (24) providing rotary power to each wheel, a slip clutch assembly (76) in said power axle (24) providing rotary power to each wheel, a slip clutch assembly (76) in said power axle, and a power motor (74) for said axle.
Claim 7
Dependent Claim
81 words
The skid jack of claim 1, said wheel means including two pairs of forks (20, 21) having wheel mounting axles (22, 23) and wheels (18, 19), said forms (20, 21) being pivoted for retracting or extending said wheels (18, 19), tie means (27) securing said forks (20, 21) together for simultaneous retracting or extending movement, and controllable piston (261) and cylinder (26) means biased between said tie means (27) and said frame (29) for retracting or extending said wheels (18, 19).
Claim 8
Dependent Claim
17 words
The skid jack of claim 6, one pair of wheel forks (121) being vertically pivoted and castored.
Claim 9
Dependent Claim
19 words
The skid jack of claim 7, and latch means (97) for securing said vertically pivoted forks (21) against castoring.
Claim 10
Dependent Claim
28 words
The skid jack of claim 8, and power means (74) operatively connected to one pair of forked wheels (18) providing the powered mobility to said skid jack (9).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |