公开(公告)号：US06269909B1

公开(公告)日：2001-08-07

申请号：US09440387

申请日：1999-11-15

Applicant: Ronald R. Grimes ,  Kelly E. Rasmussen ,  Jack W. Severson ,  William R. Isham

Inventor： Ronald R. Grimes ,  Kelly E. Rasmussen ,  Jack W. Severson ,  William R. Isham

IPC: E06C504

CPC classification number: E06C7/14 ,  E06C1/12 ,  E06C7/06 ,  E06C7/08

Abstract: An extension ladder comprised of a pair of base rails interlocked in a tongue and groove relationship with a pair of slide rails is disclosed. The rails may be manufactured in a variety of shapes including “I” beams, rectangles, boxes, or even ovals or circular shapes. Some embodiments of the ladder include a pulley assembly which is fastened to a fly rail rung and a rope is passed through the pulley to form a continuous loop around the rungs of the base set of rail rungs and the fly fail rungs. In addition, some embodiments include means for attaching tools to the fly rail.

Abstract translation: 公开了一种由与一对滑轨相互榫舌和沟槽互锁的一对基座导轨构成的延伸梯。 轨道可以以各种形状制造，包括“I”梁，矩形，箱，甚至椭圆形或圆形。 梯子的一些实施例包括一个滑轮组件，该滑轮组件被固定在飞行轨道上，并且绳索穿过皮带轮，以形成围绕基座组的轨道横梁的梯级和飞行失效梯级的连续环路。 此外，一些实施例包括用于将工具附接到飞轨的装置。