Elevator comprising telescopic sections, and a locking device therefor
AssigneeFirma Albert Bocker GmbH & Co. Kg.
InventorAlbert Bocker
Life of this patent
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Abstract
The invention relates to a locking device between two relatively movable telescopic sections of an elevator such as a scaffolding or load hoist. The individual telescopic sections are locked together by a locking dog. The locking system can be arranged to snap in automatically, and to be released by cable actuation, or vice versa. The locking dog is actuated by a draw cable which controls a locking/release cable. The cable stretch of the draw cable is compensated by a tackle block reversal thereof, that is to say a substantially greater shortening takes place (with reduced force application) in the draw cable compared with the locking/release cable. Thus, a mechanical advantage is obtained not only within the draw cable itself, but also between the draw cable and the locking/release cable.
Claims16
An elevator having a plurality of telescopic sections which are positively guided on one another, each telescopic section being of ladder-like formation having a pair of rails and a plurality of rungs extending between said rails, each pair of adjacent telescopic sections being lockable together by a respective locking device in a plurality of positions of extension, each locking device including a cable-actuated pivotable locking dog associated with one telescopic section of the associated pair of telescopic sections, each locking dog being provided with a support member for the other telescopic section of said pair of telescopic sections, each locking dog being actuated by a respective draw cable which actuates a respective locking/release cable attached to a movably-mounted intermediate member, associated with said other telescopic section of said associated pair of telescopic sections, the improvements comprising constructing each of the locking devices by
- (a) providing each of the intermediate members with a fixed pulley and a movable pulley,
- (b) mounting each of the locking dogs for movement in a direction towards an unlocked position and in a direction towards a locked position, movement in one of said directions being a spring-loaded movement, and movement in the other of said directions being under the action of the associated draw cable,
- (c) connecting each locking/release cable to the associated movable pulley, and
- (d) passing the draw cable of each telescopic section around the associated fixed pulley and around the associated movable pulley.
A locking device for locking together a pair of adjacent telescopic sections of an elevator having a plurality of telescopic sections which are positively guided on one another, each telescopic section being of ladder-like formation having a pair of rails and a plurality of rungs extending between said rails, the locking device including a cable-actuated pivotable locking dog associated with one of said pair of telescopic sections, the locking dog being provided with a support member for the other of said pair of adjacent telescopic sections, the locking dog being actuated by a draw cable which actuates a locking/release cable attached to a movably-mounted intermediate member associated with said other telescopic section, wherein the intermediate member is provided with a fixed pulley and a movable pulley, the locking dog is mounted for movement in a direction towards an unlocked position and in a direction towards a locked position, movement in one of said directions being a spring-loaded movement, and movement in the other of said directions being under the action of the draw cable, the locking/release cable being connected to the movable pulley, and the draw cable passing around the fixed pulley and around the movable pulley.
Dependencies are inferred from the claim text.