Self erecting scaffolding

Details Self erecting scaffolding Self erecting scaffolding

1995-07-27

1998-05-05

Chin-Shue, Alvin C.

Fire escape, ladder, or scaffold

Platform with elevating or lowering means

Suspended

182130, E04G 120

Patent

active

057462909

ABSTRACT:
A work platform is supported by a sleeve which is movable along a tower having a plurality of vertically equally spaced rungs. The raising system of the invention comprises two hydraulic rams pivotably attached to the sleeve and equipped with corresponding hooks at the extremity of their piston rods. The rams are activated simultaneously in up and down movement but in alternate directions, bearing in a hooking engagement in turn on the rungs of the tower to pull the sleeve upwards along the tower. When a rung is in the path of a hook in the upward movement, the latter pivots backwards to clear the rung and is pivoted back by means of springs. The lowering operation of the sleeve is done similarly to the raising operation, but there is provided latch levers that an operator must unlatch to allow springs to pivot the hooks in a rung clearing position during the retraction of the corresponding ram's piston rod, so that the hook will clear the rungs; only at the end of the retraction operation is the hook pivoted back to a rung engaging position. The raising system further comprises a toothed rack corresponding and rigidly linked to each hook, the racks engaging peripherally a complementary gear wheel on opposite sides of the latter for synchronizing the movement of the piston rods. There is also provided a security braking system, for preventing the sleeve from falling along the tower. The braking system comprises a rocking arm pivotable between a rung engaging and a rung clearing position, and a retainer arm for retaining the rocking arm in the rung clearing position. There is a finger pivotably attached to the retainer arm which will hit each successive rung and pivot to clear them, if the sleeve is lowered at a normal rate. If the sleeve is to fall rapidly, the finger will hit a rung at high speed and pivot the retainer arm, therefore making the rocking arm pivot into the rung engaging position by means of springs. The rocking arm will then abut against a rung and prevent the sleeve from falling.

REFERENCES:
patent: 4809814 (1989-03-01), St-German
patent: 5579865 (1996-12-01), Butler

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