Patent US4249749A successfully refreshed from Google Patents.
US4249749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mobile lift cart
Assignee: Individual
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Filing: 1979-03-01
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Granted: 1981-02-10
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Expires: 1999-03-01
Abstract
Abstract A scissors type mobile tool cart for supporting a tool box on a platform that can be raised or lowered to various heights. The tool cart has a safety locking mechanism which prevents collapse of the cart and which must be manually operated to change the height of the platform which is supporting the tool box.
Inventors
- 👤 Leroy Collier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:32
CPC Classifications
B; B66; B66F; B66F7/00; B66F7/06; B66F7/065; B66F7/0666; B62; B62B; B62B1/00; B66F7/0625; B62B2205/00; B62B2205/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
308 words
An extendable mobile tool lift apparatus, comprising: a base frame including wheel means for moving said apparatus over a surface, a support means for stabilizing said apparatus when in a stationary position, and a handle means for pivoting said apparatus off of said support means for movement on said wheel means; two scissors-type linkage members mounted one on opposite sides of said base frame, a first lower end of each linkage member being pivotally connected to a fixed point on said base frame, a second lower end being constrained to slide in a guideway in said base frame; bracing means connected between said linkage members for lateral support of said scissors-type linkage members; a generally flat support means for bearing a load mounted on the upper end of said scissors-type linkage members generally parallel to said base means and extendable vertically above said base means by said scissors-type linkage members; said scissors-type linkage members having a first upper end pivotally connected to a fixed point on said support means and a second upper end slidable in a guideway in said support means; a foot releasable lower locking means pivotally connected to said base frame for holding said second lower end at a releasable position along said guideway in said base frame to vary the height of said support means, said foot releasable lower locking means attaching said locking means at a proximal end to said base frame, a plurality of engaging means for releasably holding said second lower end of said scissors-type linkage members along said guideway in said base frame, and a spring biasing means connected for biasing said locking means into engagement with said base frame; and a guide means for guiding said second lower end of said scissors-type linkage members into engagement with said engaging means, said guide means slidably connected to said engaging means.
Claim 2
Dependent Claim
308 words
An extendable mobile tool lift apparatus, comprising: a base frame including wheel means for moving said apparatus over a surface, a support means for stabilizing said apparatus when in a stationary position, and a handle means for pivoting said apparatus off of said support means for movement on said wheel means; two scissors-type linkage members mounted one on opposite sides of said base frame, a first lower end of each linkage member being pivotally connected to a fixed point on said base frame, a second lower end being constrained to slide in a guideway in said base frame; bracing means connected between said linkage members for lateral support of said scissors-type linkage members; a generally flat support means for bearing a load mounted on the upper end of said scissors-type linkage members generally parallel to said base means and extendable vertically above said base means by said scissors-type linkage members; said scissors-type linkage members having a first upper end pivotally connected to a fixed point on said support means and a second upper end slidable in a guideway in said support means; a foot releasable lower locking means pivotally connected to said base frame for holding said second lower end at a releasable position along said guideway in said base frame to vary the height of said support means, said foot releasable lower locking means attaching said locking means at a proximal end to said base frame, a plurality of engaging means for releasably holding said second lower end of said scissors-type linkage members along said guideway in said base frame, and a spring biasing means connected for biasing said locking means into engagement with said base frame; and a guide means for guiding said second lower end of said scissors-type linkage members into engagement with said engaging means, said guide means slidably connected to said engaging means.
Claim 3
Dependent Claim
25 words
An extendable mobile tool lift apparatus as set forth in claim 1 wherein said base frame is mounted on a pair of wheels for movement.
Claim 4
Dependent Claim
24 words
An extendable mobile tool lift apparatus as set forth in claim 1 wherein each of said scissors-type linkage members have an identical expansion height.
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) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |