US4531752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manual utility cart
Assignee: Individual
•
Filing: 1982-12-22
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Granted: 1985-07-30
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Expires: 2002-12-22
Abstract
Abstract A cart including a detachable carrier for moving firewood from a stockpile to a fireplace within a living quarter. The cart includes large wheels for movement over rough terrain while the cart is loaded and a set of smaller wheels for movement of the cart within buildings. The cart also includes a stair climbing apparatus to enable pulling a loaded cart up a flight of stairs. In one embodiment the smaller wheels are shiftable between a raised and a lowered position for selected usage upon operation of a linkage. In a second embodiment the smaller wheels are journaled on the detachable carrier.
Inventors
- 👤 Henry Diener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:30
CPC Classifications
B; B62; B62B; B62B1/00; B62B1/10; B62B5/00; B62B5/02; B62B2202/00; B62B2202/90
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
200 words
A manual utility cart comprising a rigid wheeled frame, a wheeled carrier unit releasably connected to said frame, and means for releasably connecting said frame and carrier unit, the wheels of said carrier unit accommodating rolling travel of said carrier unit when it is detached from said frame, said frame including rearwardly extending side members at the lower end of each side thereof, a first axle rotatably carried by said side members and journaling a wheel at each of its ends, support arms carried by said first axle for mounting a second axle parallel to said first axle, a wheel journaled at each end of said second axle, said second axle and said second named wheels being located between said first named wheels, and linkage rod means pivotally connected at one end to said frame and eccentrically connected at its other end to a linkage arm rigidly secured to said first axle for shifting said second axle and said second named wheels between a retracted position above said first axle and a lowered position in which said second named wheels support said frame, wherein said frame is selectively supported by either said first named wheels or said second named wheels.
Claim 2
Dependent Claim
200 words
A manual utility cart comprising a rigid wheeled frame, a wheeled carrier unit releasably connected to said frame, and means for releasably connecting said frame and carrier unit, the wheels of said carrier unit accommodating rolling travel of said carrier unit when it is detached from said frame, said frame including rearwardly extending side members at the lower end of each side thereof, a first axle rotatably carried by said side members and journaling a wheel at each of its ends, support arms carried by said first axle for mounting a second axle parallel to said first axle, a wheel journaled at each end of said second axle, said second axle and said second named wheels being located between said first named wheels, and linkage rod means pivotally connected at one end to said frame and eccentrically connected at its other end to a linkage arm rigidly secured to said first axle for shifting said second axle and said second named wheels between a retracted position above said first axle and a lowered position in which said second named wheels support said frame, wherein said frame is selectively supported by either said first named wheels or said second named wheels.
Claim 3
Dependent Claim
40 words
The cart of claim 1, wherein a stair traversing elongated member is connected to said second axle and is shiftable with said second axle between an operative stair-engaging position spaced from said frame and a retracted position adjacent said frame.
Claim 4
Dependent Claim
35 words
The cart of claim 2, wherein said stair traversing member includes a rigid structure carried by said second axle and journaling dual sets of pulleys, and a belt trained above the pulley of each set.
Claim 5
Dependent Claim
67 words
The cart of claim 1, wherein a plate projects from the lower part of said frame and has an opening therein, said carrier unit having a pin at its lower end which fits releasably within said opening, a first latch member carried by an upper part of said frame, and a second latch member carried by said carrier unit for releasable interlock with said first latch member.
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) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |