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US4069892A Expired / Lapsed US ⏱️ 0.0 years remaining

Ladder

Assignee: Individual
•
Filing: 1976-06-09
•
Granted: 1978-01-24
•
Expires: 1996-06-09
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Abstract

Abstract A ladder for installing against and parallel to a wall or the like, with a central rod from which there extend rungs in opposite directions. The rod has at least one fastening device for fastening the ladder to the wall or the like. At least some of the rungs are equipped at their outer ends with transverse distance pieces, the free ends of which are intended to lie against the wall or the like. The rungs and the distance pieces are made of one piece of rod material, and that the rungs and distance pieces are connected with one another over a part which extends from the outer end of the rung and upward in the installation position of the ladder. Pat. The present invention relates to an improvement in a ladder of the kind which has a central rod from which stick out rungs in opposite directions. The ladder is intended for various uses, but principally for installing in wells, tanks and the like, as well as for use as a fire- or rescue ladder. Ladders are known with a simple, central rod from which extend steps in opposite directions. Ladders of this kind are used in hanging position, as a bathing ladder for pleasure craft or as shown in the U.S.

Inventors

  • 👤 Tor Lynne
  • 👤 Egil Martinsen
  • 👤 Arvid Sydtveit

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 13:04
CPC Classifications
E; E06; E06C; E06C9/00; E06C9/02; E06C1/00; E06C1/02; E06C1/38; E06C1/381

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 217 words
A ladder for installation against and parallel to a wall or the like comprising: a central rod, a plurality of rungs carried by said central rod at longitudinally spaced intervals therealong and extending in opposite directions therefrom, said rungs lying in a first common plane one with the other, means carried by said central rod for fastening said ladder to the wall or the like, at least a predetermined number of the rungs having transverse distance pieces at their outer ends extending in a direction generally normal to said first common plane for engagement against the wall or the like, said distance pieces having end portions lying in a second common plane generally parallel to said first common plane, each of the rungs of said predetermined number thereof having a portion extending from its outer end to the distance piece carried thereby in a direction generally parallel to said first common plane and said central rod and toward one end of said central rod, said rungs, rung portions, and distance pieces being formed of unitary rod material, said one rod being formed to extend out of said first common plane on the same side thereof as said distance pieces, said fastening means being at least in part carried by the free end of said one rod end.
Claim 2
Dependent Claim 217 words
A ladder for installation against and parallel to a wall or the like comprising: a central rod, a plurality of rungs carried by said central rod at longitudinally spaced intervals therealong and extending in opposite directions therefrom, said rungs lying in a first common plane one with the other, means carried by said central rod for fastening said ladder to the wall or the like, at least a predetermined number of the rungs having transverse distance pieces at their outer ends extending in a direction generally normal to said first common plane for engagement against the wall or the like, said distance pieces having end portions lying in a second common plane generally parallel to said first common plane, each of the rungs of said predetermined number thereof having a portion extending from its outer end to the distance piece carried thereby in a direction generally parallel to said first common plane and said central rod and toward one end of said central rod, said rungs, rung portions, and distance pieces being formed of unitary rod material, said one rod being formed to extend out of said first common plane on the same side thereof as said distance pieces, said fastening means being at least in part carried by the free end of said one rod end.
Claim 3
Dependent Claim 51 words
A ladder according to claim 1 wherein the other end of said central rod is formed to extend out of said first common plane on the same side thereof as said distance pieces, said fastening means being at least in part carried by the free end of said outer rod end.
Claim 4
Dependent Claim 68 words
A ladder according to claim 1 wherein said central rod has a plurality of openings spaced longitudinally therealong, each rung being receivable at its inner end in an opening in the central rod, and means including a tackweld for securing each said rung and said central rod one to the other when the inner end of each rung is received in the corresponding opening in the central rod.

References Cited (Backward Citations)

DE51203C Cited
US144690A Cited
US1134087A Cited
US988719A Cited
DE803948C Cited
US3512608A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1981-01-23 1981-07-25 1982-01-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1985-01-23 1985-07-25 1986-01-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1989-01-23 1989-07-25 1990-01-24 $7700.00 Window Closed / Lapsed

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