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US4949810A Expired / Lapsed US ⏱️ 0.0 years remaining

Attachment to stabilize and expand the use of hollow rung ladders

Assignee: Individual
•
Filing: 1988-10-03
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Granted: 1990-08-21
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Expires: 2008-10-03
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Abstract

Abstract A pair of attachments for use with ladders constructed with hollow rungs to stabilize the ladder and to protect the gutter. These attachments when used with ladders also provide for a scaffold plank. The attachments when used with a ladder on a pitched roof allows the ladder to be used to access that roofs peak. Previously the ladder would rest on the rain gutter when the user was to access the roof of a building. Previously a work platform had to be built from wood or metal resulting in time consuming construction. Previously when accessing the roof peak of a building a means of providing a positive foothold had to be constructed from rope and ladder or from wood. The present invention provides steel flat bars bent to fit the rung spacing of the ladder with a steel tube welded at each end sized to fit snuggly into the opening of any two consecutive rungs in that ladder. The ladder can now be used to access the roof of a building without resting on the gutter. The ladder can be used as part of a scaffold and to provide a positive foothold when on a pitched roof.

Inventors

  • 👤 Wayne F. Dwinnell

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 05:12
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/34; E06C1/345; E06C7/00; E06C7/16; E06C7/48; E06C7/488

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 138 words
A bracket attachment for a ladder having a plurality of spaced hollow rungs, said bracket attachment having a flat metal bar bended at an acute angle, a pair of metal tubes, each one of said metal tubes being attached at one end to each end of said flat metal bar, the other end of said metal tubes extending a distance from an edge of said flat metal bar, the opposite distance between each metal tube being greater than the distance between a pair of adjacent hollow rungs whereby upon compression of each end of said flat metal bar toward each other, the metal tubes could be inserted into the hollow rungs of the ladder with a spring action providing a positive locking of said bracket within the ladder rungs and without the use of any other fastening means.
Claim 2
Dependent Claim 138 words
A bracket attachment for a ladder having a plurality of spaced hollow rungs, said bracket attachment having a flat metal bar bended at an acute angle, a pair of metal tubes, each one of said metal tubes being attached at one end to each end of said flat metal bar, the other end of said metal tubes extending a distance from an edge of said flat metal bar, the opposite distance between each metal tube being greater than the distance between a pair of adjacent hollow rungs whereby upon compression of each end of said flat metal bar toward each other, the metal tubes could be inserted into the hollow rungs of the ladder with a spring action providing a positive locking of said bracket within the ladder rungs and without the use of any other fastening means.

References Cited (Backward Citations)

US2871067A Cited
US3059723A Cited
US3792750A Cited
EP0081404A2 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1993-08-20 1994-02-19 1994-08-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-08-20 1998-02-19 1998-08-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-08-20 2002-02-19 2002-08-21 $7700.00 Window Closed / Lapsed

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