Patent US4770273A successfully refreshed from Google Patents.
US4770273A
Expired / Lapsed
US
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Ladder lift apparatus
Assignee: MCCRANE COMPANY A DE Co
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Filing: 1987-12-07
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Granted: 1988-09-13
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Expires: 2007-12-07
Abstract
Abstract A lifting apparatus usable to lift heavy loads from the ground to a roof surface including a horizontally positioned, shoulder mounted lifting bar or beam with a winch means, fastened to the bar or beam where one end of the lifting bar or beam is pivotally connected to a vertically positioned ladder or extension ladder, with means to allow pivotal rotation of the upper end of the ladder toward the roof to deposit the load on the roof or into a window of a multi-story building.
Inventors
- 👤 William H. McMakin
- 👤 Mark R. McMakin
- 👤 Glen R. McMakin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:21
CPC Classifications
B; B66; B66B; B66B9/00; B66B9/16; E; E06; E06C; E06C7/00; E06C7/12
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
126 words
A lift apparatus for use to lift a heavy load from the ground to the roof of a building comprising in combination: (a) a vertically positioned heavy duty ladder with multiple rungs, (b) a horizontally positioned lift bar member, with lifting means attached to the lift bar member, (c) attachment means positioned on one end of the lift bar to pivotally attach one ladder rung to the lift bar so that the rung can rotate within the attachment means and as the lift bar is moved and means to support the opposite end of the lift bar on the operators shoulder, (d) means to pivot the upper end of the ladder to the edge of the roof to allow delivery of the load onto the roof.
Claim 2
Dependent Claim
126 words
A lift apparatus for use to lift a heavy load from the ground to the roof of a building comprising in combination: (a) a vertically positioned heavy duty ladder with multiple rungs, (b) a horizontally positioned lift bar member, with lifting means attached to the lift bar member, (c) attachment means positioned on one end of the lift bar to pivotally attach one ladder rung to the lift bar so that the rung can rotate within the attachment means and as the lift bar is moved and means to support the opposite end of the lift bar on the operators shoulder, (d) means to pivot the upper end of the ladder to the edge of the roof to allow delivery of the load onto the roof.
Claim 3
Dependent Claim
14 words
The lift apparatus of claim 1, where in the ladder is an extension ladder.
Claim 4
Dependent Claim
32 words
The lifting apparatus defined in claim 1, wherein the horizontal lift bar member is a straight, light weight tubular member of sufficient strength to avoid bending under a load of 500 lb.
Claim 5
Dependent Claim
25 words
The lift apparatus as defined in claim 1 where the means to pivotally attach the lift bar to the ladder is a pair of bolts.
Claim 6
Dependent Claim
15 words
claim 4 where one end of the lift bar is bolted to a ladder rung.
Claim 7
Dependent Claim
56 words
The lift apparatus defined in claim 1. Wherein, the means to attach the lift bar member to a ladder rung is a U-shaped bracket that snaps over one ladder rung in such a manner as to allow the rung to turn within the U-shaped bracket as the lift bar is moved with respect to the ladder.
Claim 8
Dependent Claim
35 words
The lift apparatus of claim 1 wherein the means to lift the load is a winch assembly, comprising a drum, ratchet gear, pawl and crank handle that operates the ratchet gear, cable, pulley, and hook.
Claim 9
Dependent Claim
19 words
The lift apparatus defined in claim 6, where the U-shaped bracket is bolted around one rung of the ladder.
Claim 10
Dependent Claim
30 words
The lift apparatus defined in claim 2 wherein the means to pivot the upper end of the ladder is a handle member extending from the side of the lift bar.
Claim 11
Dependent Claim
21 words
The lift apparatus as defined in claim 1 where the operator shoulder support means is supplemented by a mobile platform member.
Claim 12
Dependent Claim
15 words
The lift apparatus as defined in claim 10 where the platform member is a tripod.
Claim 13
Dependent Claim
115 words
In a ladder lift system including vertical structure comprising a conventional extension ladder mounted in a vertical position adjacent to and generally parallel to the side wall of a building and horizontal structure attached to the vertical positioned ladder; the improvement comprising as a part of the horizontal structure, a horizontally positioned lift bar, means to pivotally fasten one end of the lift bar to one rung of the vertically extended ladder, and where one surface of the lift bar is fitted with a lift means including a cable and at least one cable guide means and when the lift means is manually operated by an operator who supports one end of the lift bar.
Claim 14
Dependent Claim
115 words
In a ladder lift system including vertical structure comprising a conventional extension ladder mounted in a vertical position adjacent to and generally parallel to the side wall of a building and horizontal structure attached to the vertical positioned ladder; the improvement comprising as a part of the horizontal structure, a horizontally positioned lift bar, means to pivotally fasten one end of the lift bar to one rung of the vertically extended ladder, and where one surface of the lift bar is fitted with a lift means including a cable and at least one cable guide means and when the lift means is manually operated by an operator who supports one end of the lift bar.
Claim 15
Dependent Claim
25 words
The ladder lift system defined in claim 12 where the winch lift means comprises a winch, associated cable and at least one cable guide means.
Claim 16
Dependent Claim
53 words
The ladder lift system defined in claim 12, where the means to fasten one end of lift bar to the ladder is a laterally disposed bracket member permanently fastened to the lift bar and where the bracket member is fitted with means to fasten the lift bar to one of the ladder rungs.
Claim 17
Dependent Claim
29 words
The ladder lift system defined in claim 13 where the lift means is an electrically driven winch that the operator initiates while supporting one end of the lift bar.
Claim 18
Dependent Claim
30 words
The ladder lift system defined in claim 12 where the winch is hand operated by an operator who turns the crank arm while supporting one end of the lift bar.
Claim 19
Dependent Claim
38 words
The ladder lift system defined in claim 12 where a clamp means fastens the lift bar to one of the rungs of the ladder while the clamp allows rotational movement between the lift bar and the ladder rung.
Claim 20
Dependent Claim
28 words
The ladder lift system defined in claim 17 where the clamp is a two piece clamp having a hinge along one edge and bolts along the opposite edge.
Claim 21
Dependent Claim
21 words
The ladder lift system defined in claim 14 where the bracket is a U-shaped bracket that fits over a ladder rung.
Claim 22
Dependent Claim
18 words
The ladder lift system defined in claim 19 where the U-shaped bracket is bolted around one ladder rung.
Claim 23
Dependent Claim
24 words
The ladder lift system defined in claim 14 where the means to fasten the bracket to the ladder rung is a pair of U-bolts.
Claim 24
Dependent Claim
52 words
The ladder lift system defined in claim 13 where the winch is mounted on top of the lift bar, an opening is provided through the lift bar to allow the cable to pass through the lift bar and pulley means positioned between the winch means and the opening in the lift bar.
Claim 25
Dependent Claim
37 words
The ladder lift system defined in claim 12 where the cable, cable guide means, and means to fasten the lift bar to one rung of the ladder are all located and positioned in one single horizontal plane.
Claim 26
Dependent Claim
25 words
The ladder lift system of claim 12 wherein a stabilizer is used to secure the ladder in a vertical position, essentially parallel to the building.
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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) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |