| 摘要 |
PCT No. PCT/US90/01070 Sec. 371 Date Jul. 23, 1991 Sec. 102(e) Date Jul. 23, 1991 PCT Filed Feb. 26, 1990 PCT Pub. No. WO91/10037 PCT Pub. Date Jul. 11, 1991.A ladder assembly is adapted to be mounted on a suitable support, such as a truck or trailer. The ladder assembly includes a ladder mounted on the distal end of a shaft. The shaft is slidably received in a cylinder. A pair of spaced abutment stops are provided on the support, and provide a recess to receive a portion of the ladder when the ladder is in its upright position. A spring urges the shaft and ladder to move toward the support along the axis (x-x) of the cylinder. The ladder is adapted to be moved between an upright position, at which a portion of the ladder is received in the recess between the abutment stops, and an out-of-the-way horizontal position.
|
