Ladder jack clamping devices

Details Ladder jack clamping devices Ladder jack clamping devices

1987-06-15

1991-06-04

Chin-Shue, Alvin C.

Supports

Brackets

Specially mounted or attached

248500, 182121, E04G 500

Patent

active

050207571

ABSTRACT:
A ladder jack supported by an inclined ladder and adapted to securely support a work platform comprising a horizontal support member fitted with a longitudinally adjustable clamping means to securely clamp the work platform in locking engagement with the ladder jack and prevent movement of the work platform in all directions and planes while in use.

REFERENCES:
patent: 1143678 (1915-06-01), Winans
patent: 1474462 (1963-11-01), Blankenhagen
patent: 1835728 (1931-12-01), Urfer
patent: 2783963 (1957-03-01), Kalberg
patent: 3787024 (1974-01-01), Dzus, Jr.
patent: 4074792 (1978-02-01), Zaugg et al.
patent: 4199072 (1980-04-01), Jacks
patent: 4338036 (1982-07-01), DeLeu

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