Dock leveler with a movable ramp and an inflatable member

Details Dock leveler with a movable ramp and an inflatable member Dock leveler with a movable ramp and an inflatable member

1996-06-03

1998-09-08

Lisehora, James

Bridges

Gangway, ramp, or dock leveler

Attached

14 717, 254 93HP, E01D 100, E01D 1800

Patent

active

058026517

ABSTRACT:
A dock leveler comprising a ramp movable between a lowered position and a raised position, an inflatable member positioned to move the ramp to its raised position upon inflation of the inflatable member, and an inflating device operatively connected with the internal cavity. The inflatable member includes upper and lower portions at least partially defining an internal cavity. An insert member is positioned in the internal cavity for maintaining a volume of gas between the upper and lower portions. Preferably, the insert member functions to maintain the inflatable member in engagement with a downwardly facing surface of the ramp, thereby inhibiting the presence of debris between the inflatable member and the ramp, and further expediting inflation of the inflatable member.

REFERENCES:
patent: 2610824 (1952-09-01), Grier
patent: 3379411 (1968-04-01), Vanderjagt
patent: 3521861 (1970-07-01), Freudenthal et al.
patent: 3659899 (1972-05-01), Phillips et al.
patent: 3711157 (1973-01-01), Smock
patent: 3784255 (1974-01-01), Smock
patent: 4538311 (1985-09-01), Hall et al.
patent: 4572579 (1986-02-01), Saito
patent: 5042103 (1991-08-01), Megens
patent: 5067774 (1991-11-01), Trowland
patent: 5446938 (1995-09-01), Warner et al.
patent: 5450643 (1995-09-01), Warner
patent: 5471693 (1995-12-01), Hodges
patent: 5522108 (1996-06-01), Massey et al.

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