US4258826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination stepladder and load lifting apparatus
Assignee: Individual
•
Filing: 1979-03-28
•
Granted: 1981-03-31
•
Expires: 1999-03-28
Abstract
Abstract Two frame sections are hingedly attached at their top and each frame section contains a pair of wheels at the bottom. One of the frame sections consists of a pair of laterally spaced parallel side rails having horizontal steps disposed therebetween. The other frame section contains a pair of parallel spaced channel bars on which ride a vertically movable platform. The platform can be hoisted along the channel bars by use of a hand crank and winch assembly. The two frame sections can be folded together for use as a conventional hand truck or the frame sections can be folded apart and the wheels locked for use as a stepladder.
Inventors
- 👤 Douglas J. Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:41
CPC Classifications
B; B62; B62B; B62B1/00; B62B1/10; B62B1/14; B62B1/002; B62B3/00; B62B3/04; E; E06; E06C; E06C1/00; E06C1/02; E06C1/38; E06C1/397; E06C7/00; E06C7/16; B62B2203/00; B62B2203/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
178 words
A combination stepladder and load lifting apparatus comprising in combination: a ladder portion having side rails and steps disposed between the side rails; a first pair of wheels attached to the bottom of said ladder portion; a load lifting portion pivotally attached to the top of said ladder portion, said lifting portion including longitudinal side members; a second set of wheels attached at the bottom of said side members; and load lifting means attached to said lifting portion and mounted between said side members, said load lifting means including a first lifting platform and a second lifting platform hingedly attached for disposition in a first surmounting position over said first platform and a second position rising upwardly from said first platform to form a back for said first platform, and, a connection cable attached to said first and second lifting platforms at one end and a cable spool attached to the opposite end of said cable, a hand crank connected to said cable spool for rotating said cable spool to draw said lifting platforms along said side members.
Claim 2
Dependent Claim
178 words
A combination stepladder and load lifting apparatus comprising in combination: a ladder portion having side rails and steps disposed between the side rails; a first pair of wheels attached to the bottom of said ladder portion; a load lifting portion pivotally attached to the top of said ladder portion, said lifting portion including longitudinal side members; a second set of wheels attached at the bottom of said side members; and load lifting means attached to said lifting portion and mounted between said side members, said load lifting means including a first lifting platform and a second lifting platform hingedly attached for disposition in a first surmounting position over said first platform and a second position rising upwardly from said first platform to form a back for said first platform, and, a connection cable attached to said first and second lifting platforms at one end and a cable spool attached to the opposite end of said cable, a hand crank connected to said cable spool for rotating said cable spool to draw said lifting platforms along said side members.
Claim 3
Dependent Claim
52 words
The combination of claim 1 and further including folding bracket means extending between said ladder portion and said load lifting portion for holding said ladder portion and said load lifting portion in a first mutually diverging relation, and allowing the ladder portion and load lifting portion to assume a second, side-by-side, relation.
Claim 4
Dependent Claim
20 words
The combination of claim 1 wherein one of said sets of wheels includes brake means for holding said wheels stationary.
Claim 5
Dependent Claim
25 words
The combination of claim 1 and further including a brake means connected to said cable spool for inhibiting gravity induced movement of said lifting platforms.
Claim 6
Dependent Claim
42 words
The combination of claim 1 wherein said side members are channel bars and further wherein said lifting means includes a pair of wheels disposed in each of said channel bars for allowing sliding motion of said lifting means within said channel bars.
Claim 7
Dependent Claim
25 words
The combination of claim 7 and further including a pair of handles with one handle connected to and extending from each of said channel bars.
Claim 8
Dependent Claim
38 words
The combination of claim 2 wherein said ladder portion is disposed slightly forward of the rear edge of the second set of wheels when in said second, side-by-side, relation for providing a creeper for use on stair risers.
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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) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |