Ladder levelling device with locking means

Details Ladder levelling device with locking means Ladder levelling device with locking means

1990-07-19

1991-04-16

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Ladder

Supporting surface compensating means

2481883, E06C 744

Patent

active

050075039

ABSTRACT:
An automatic levelling device for attachment to a ladder to allow the ladder to be used on an uneven supporting surface. The levelling device includes a downwardly opened U-shaped tubular member which guidably supports therein a ball chain connecting element. Slidable within the open ends of the tubular member and attached to opposite ends of the connecting element are extendable legs.
A locking means is connected to the tubular member and is adapted to cooperate with the ball chain to provide positive locking of the chain when the extendable legs are in the proper position to maintain the ladder in a vertical orientation. The ball chain when locked in the locking means can not be unlocked unless weight is removed from both supporting legs.

REFERENCES:
patent: 2552941 (1946-04-01), Courtney
patent: 2598875 (1951-04-01), Anderson
patent: 3090466 (1963-05-01), Wright
patent: 3102606 (1963-09-01), Hopfeld
patent: 3215383 (1965-11-01), Wright
patent: 3794141 (1974-02-01), Sturm
patent: 3880388 (1975-04-01), Beguin
patent: 4095671 (1978-06-01), Forristall
patent: 4497390 (1985-02-01), Wilson
patent: 4770275 (1988-09-01), Williams

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