Patent ID: 6145618
Filing Date: 2000-11-14
Classification: E06C

Abstract:
A ladder system comprising:a first rail having a top and a bottom, and a first non-linear rail slot in proximity to the bottom;a second rail having a top and a bottom, and a second non-linear rail slot in proximity to the bottom, said second rail disposed adjacent to and in parallel with the first rail;at least one rung connected to and in perpendicular relationship with the first rail and the second rail;a first ladder shoe;a first bolt extending through the first ladder shoe and the first rail slot to moveably connect the first ladder shoe to the first rail with the first non-linear rail slot of a shape so the first ladder shoe can move about the bottom of the first rail and the first rail can rotate relative to the first ladder shoe inside the first ladder shoe without interference occurring between the first rail and the first ladder shoe;a second ladder shoe; anda second bolt extending through the second ladder shoe and the second rail slot to moveably connect the second ladder shoe to the second rail with the second non-linear rail slot of a shape so the second ladder shoe can move about the bottom of the second rail and the second rail can rotate relative to the second ladder shoe inside the second ladder shoe without interference occurring between the second rail and the second ladder shoe.