Vertically storing dock leveler

Details Vertically storing dock leveler Vertically storing dock leveler

1991-07-02

1992-06-02

Britts, Ramon S.

Bridges

Gangway, ramp, or dock leveler

Attached

14 711, E01D 100

Patent

active

051175266

ABSTRACT:
A hydraulic lift bridge/leveler that is raised by an hydraulic cylinder and lowered primarily by gravity. A toggle mechanism is used to lock the bridge in a near vertical position. An auxiliary cylinder moves a lock-out arm assembly to release the toggle mechanism and power the bridge downward to a point where the weight moment through the pivot point is significantly large that the bridge will lower itself by gravity. The main cylinder employs a cushion mechanism that decelerates the bridge by slowly increasing hydraulic pressure in the cylinder. This allows the bridge to be raised at an initially high rate of speed and then slowed down near the end of travel at a near vertical position.

REFERENCES:
patent: 3805672 (1974-04-01), Pekrul
patent: 3883917 (1975-05-01), Alten
patent: 3974537 (1976-08-01), Ellis et al.
patent: 4365374 (1982-12-01), Bennett
patent: 4641388 (1987-02-01), Bennett et al.
patent: 4651623 (1987-03-01), Rogers
patent: 4665579 (1987-05-01), Bennett et al.
patent: 4689846 (1987-09-01), Sherrod
patent: 4776052 (1988-10-01), Delgado et al.

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