Browse Prior Art Database

Adjustable Insert Ladder for Use on Uneven or Sloped Surface

IP.com Disclosure Number: IPCOM000004380D
Publication Date: 2000-Oct-20
Document File: 2 page(s) / 356K

Publishing Venue

The IP.com Prior Art Database

Related Documents

IPCOM000004374D: IP.COM

Abstract

The present invention is for an adjustable ladder wherein one leg (side) of the ladder has an adjustable insert at its lower end, wherein the adjustable insert inserts into the short hollow side of the ladder. This enables the ladder to be placed against a vertical surface without tilting from left to right or right to left, even when it is standing on a surface that is uneven or slopes in a direction that is non-perpendicular to the vertical surface that the ladder is leaning on. Only one bolt is required to secure the adjustable insert to the short side of the ladder, facilitating quick and easy adjustment.

This text was extracted from a RTF document.
This is the abbreviated version, containing approximately 83% of the total text.

Adjustable Insert Ladder for Use on Uneven or Sloped Surface

Most ladders can be used safely on a level surface or on a surface that slopes upward or downward in the direction perpendicular from the vertical surface that the ladder is leaning on. However, if a surface is uneven or slopes in a direction that is non-perpendicular to the vertical surface that the ladder is leaning on the ladder will lean to the left or right, posing a hazard. Typically, ladder users will place a brick, a piece of scrap wood, a rock or some other makeshift device under one of the feet of the ladder in order to reduce the amount by which it leans to the left or right. Not only is this approach inconvenient, since a makeshift device of the right size is not always readily available, but it is extremely hazardous since the device my break, dislodge, or shift during use, causing the ladder to tip over to one side. IP.com (www.ip.com) publication IPCOM000004374D describes an adjustable ladder that has an adjustable section that attaches to the outside of the short side of the ladder. That ladder improves on the prior art, but requires two bolts for stability. It would be advantageous to have an adjustable ladder that only requires one bolt. Such a ladder would require less time and effort to adjust.

The present invention is for an adjustable ladder wherein one leg (side) of the ladder has an adjustable insert at its lower end, wherein the adjustable insert inserts into the short hollow side of the ladder. This enables the ladder to be placed against a vertical surface without tilting from left to right or right to left, even when it is standing on a surface that is uneven or slopes in a direction that is non-perpendicular to the vertical surface that the ladder is leaning on. Only one bolt is required to secure the adjustable insert to the short side of the ladder, facilitating quick and easy adjustment.

The ladder is shown in the accompanying drawings (below), which are not drawn to scale. Drawing 1 shows an unassembled view. Drawing 2 shows an assembled view using 2 bolts. Note that the second bolt is not required, but may be kept on the ladder as a spare in case one bolt is lost. Short hollow side (2), which is shorter than long side (1), contains a plurality of holes for bolts (4) along its lower end. An adjustable insert (3), which contains a plurality of holes for bolts (4) along its length, is slightly narrower and thinner than short hollow section (2). It can be inserted into the bottom of short hollow side (2) and secured using one or more bolts (7) and one or more wing nuts (6) in a variable fashion such that the resulting length of short hollow side (2) with adjustable insert (3) attached is longer, equal to, or shorter than longer side (1) by a length that can be selected by the user to compensate for surface unevenness or slope. Use of wing nuts (6) enables length adjustments to be made quickly and by ...