A Lift Assembly
Patent Application, Filed 8 Mar 2000
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
A lift assembly includes first and second elevator structures, each including a first scissors section, a second scissors section pivotally connected to the first scissors section and supporting a lift shaft which extends between the first and second structures, at least one intermediate scissors section pivotally connected to the second scissors section, and an upper scissors section pivotally connected to an uppermost of the intermediate scissors sections and supporting a top bar. First ard second side plates upstand adjacent the first and second structures, each having therein an elongated slot, the lift shaft being disposed in the slots. A lower pulley is mounted proximate each of the base bars on a common drive shaft. An upper pulley is mounted proximate an upper end of each of the side plates. A strand extends from each of the lower pulleys to each of the upper pulleys, and thence to the lift shaft. A motor is operable to rotate the drive shaft and thereby the lower pulleys to draw in the strand to draw the lift shaft upwardly in the side plate slots, to draw the second scissors section, and thereby remaining scissors sections, upwardly, to raise the top bar.
- Construction Equipment, Materials and Supplies