US3768778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lift carriage
Assignee: McNeil Corp
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Filing: 1971-06-11
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Granted: 1973-10-30
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Expires: 1991-06-11
Abstract
Abstract A lifting jack has a base that is provided with rear wheels and a front caster plate which is movable between operative and inoperative positions and arranged so that it may be held in the operative position by the lift carriage of the jack.
Inventors
- 👤 L Arnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:15
CPC Classifications
B; B66; B66F; B66F5/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
182 words
A lifting jack comprising a base, a vertical column supported on the base, a carriage supported on the column for vertical movement, said base extending horizontally from the column and including a horizontal member spaced horizontally a substantial distance from the column, first wheel means mounted on the base for rolliNg on a horizontal surface and having a fixed vertical position, second wheel means mounted on the base for rolling on a horizontal surface and movable in a vertical direction between an operative position and an inoperative position, and hold down means engageable with the second wheel means for holding it in an operative position, said second wheel means including a lever rockably connected to the base and a caster wheel carried by the lever having an axle serving as the fulcrum of the lever, said lever being rockably connected at one end to said horizontal member of the base, said caster wheel being located intermediate the ends of the lever and the other end of the lever being engageable with the carriage whereby said carriage serves as said hold down means.
Claim 2
Dependent Claim
182 words
A lifting jack comprising a base, a vertical column supported on the base, a carriage supported on the column for vertical movement, said base extending horizontally from the column and including a horizontal member spaced horizontally a substantial distance from the column, first wheel means mounted on the base for rolliNg on a horizontal surface and having a fixed vertical position, second wheel means mounted on the base for rolling on a horizontal surface and movable in a vertical direction between an operative position and an inoperative position, and hold down means engageable with the second wheel means for holding it in an operative position, said second wheel means including a lever rockably connected to the base and a caster wheel carried by the lever having an axle serving as the fulcrum of the lever, said lever being rockably connected at one end to said horizontal member of the base, said caster wheel being located intermediate the ends of the lever and the other end of the lever being engageable with the carriage whereby said carriage serves as said hold down means.
Claim 3
Dependent Claim
19 words
A jack as set forth in claim 1 including an adjustable bumper member acting between the lever and carriage.
Claim 4
Dependent Claim
206 words
A lifting jack comprising a base, a vertical column supported on the base, a carriage supported on the column for vertical movement, said base extending horizontally from the column and including a horizontal member spaced horizontally a substantial distance from the column, first wheel means mounted on the base for rolling on a horizontal surface and having a fixed vertical position, second wheel means mounted on the base for rolling on a horizontal surface and movable in a vertical direction between an operative position and an inoperative position, hold down means engageable with the second wheel means for holding it in an operative position, said horizontal member including a horizontal flange, said second wheel means including a plate and a caster wheel mounted on a central portion of the plate so that the axle of the wheel serves as a fulcrum for rocking movement of the plate, one end of the plate being rockably connected to said horizontal flange, spring means acting on the one end to urge the plate to a horizontal position, the other end of the plate having an adjustable bumper screw engageable by said carriage when the carriage is in a lowered position whereby said carriage serves as said hold down means.
Claim 5
Dependent Claim
206 words
A lifting jack comprising a base, a vertical column supported on the base, a carriage supported on the column for vertical movement, said base extending horizontally from the column and including a horizontal member spaced horizontally a substantial distance from the column, first wheel means mounted on the base for rolling on a horizontal surface and having a fixed vertical position, second wheel means mounted on the base for rolling on a horizontal surface and movable in a vertical direction between an operative position and an inoperative position, hold down means engageable with the second wheel means for holding it in an operative position, said horizontal member including a horizontal flange, said second wheel means including a plate and a caster wheel mounted on a central portion of the plate so that the axle of the wheel serves as a fulcrum for rocking movement of the plate, one end of the plate being rockably connected to said horizontal flange, spring means acting on the one end to urge the plate to a horizontal position, the other end of the plate having an adjustable bumper screw engageable by said carriage when the carriage is in a lowered position whereby said carriage serves as said hold down means.
Claim 6
Dependent Claim
112 words
A lifting jack comprising a base, a vertical column supported on the base, a carriage supported on the column for vertical movement, said base extending horizontally from the column and including a horizontal member spaced horizontally a substantial distance from the column, first wheel means mounted on the base for rolling on a horizontal surface and having a fixed vertical position, second wheel means mounted on the base for rolling on a horizontal surface and movable in a vertical direction between an operative position and an inoperative position, and hold down means engageable with the second wheel means for holding it in an operative position, said hold down means comprising said carriage.
Claim 7
Dependent Claim
112 words
A lifting jack comprising a base, a vertical column supported on the base, a carriage supported on the column for vertical movement, said base extending horizontally from the column and including a horizontal member spaced horizontally a substantial distance from the column, first wheel means mounted on the base for rolling on a horizontal surface and having a fixed vertical position, second wheel means mounted on the base for rolling on a horizontal surface and movable in a vertical direction between an operative position and an inoperative position, and hold down means engageable with the second wheel means for holding it in an operative position, said hold down means comprising said carriage.
Claim 8
Dependent Claim
135 words
A lifting jack comprising a base, a vertical column supported on the base, a carriage supported on the column for vertical movement, said base extending horizontally from the column and including a horizontal member spaced horizontally a substantial distance from the column, first wheel means mounted on the base for rolling on a horizontal surface and having a fixed vertical position, second wheel means mounted on the base for rolling on a horizontal surface and movable in a vertical direction between an operative position and an inoperative position, and hold down means engageable with the second wheel means for holding it in an operative position, said second wheel means including a lever rockably connected to the base and a caster wheel carried by the lever having an axle serving as the fulcrum of the lever.
Claim 9
Dependent Claim
135 words
A lifting jack comprising a base, a vertical column supported on the base, a carriage supported on the column for vertical movement, said base extending horizontally from the column and including a horizontal member spaced horizontally a substantial distance from the column, first wheel means mounted on the base for rolling on a horizontal surface and having a fixed vertical position, second wheel means mounted on the base for rolling on a horizontal surface and movable in a vertical direction between an operative position and an inoperative position, and hold down means engageable with the second wheel means for holding it in an operative position, said second wheel means including a lever rockably connected to the base and a caster wheel carried by the lever having an axle serving as the fulcrum of the lever.
Claim 10
Dependent Claim
24 words
A jack as set forth in claim 5 wherein said lever is rockably connected at one end to said horizontal member of the base.
References Cited (Backward Citations)
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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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |