Locking system for extension members on portable lifts

Details Locking system for extension members on portable lifts Locking system for extension members on portable lifts

1994-04-18

1997-09-16

Keenan, James W.

Material or article handling

Elevator or hoist and loading or unloading means therefor

Comprising means enabling additional movement of carrier or...

212901, B66C 2304

Patent

active

056673523

ABSTRACT:
A locking system for extension members on portable lifts or the like has a wedge block with a jaw face on one side and a sloped wedge face on the opposite side engaging a complementing fixed sloped face so that when the wedge block is moved upwardly the complementing faces cause the wedge block to also move horizontally into clamping position by way of the jaw face. The wedge block is moved upwardly responsive to turning of a screw threaded into the block.

REFERENCES:
patent: 1598928 (1926-09-01), O'Dell
patent: 2917189 (1959-12-01), Isaacs
patent: 3263837 (1966-08-01), Noller et al.
patent: 3266598 (1966-08-01), Henne
patent: 4650392 (1987-03-01), Casteel
patent: 4749324 (1988-06-01), Rulison
patent: 5505578 (1996-04-01), Fuller

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