Return-to-dock-level mechanism for a dockboard having a hydrauli

Details Return-to-dock-level mechanism for a dockboard having a hydrauli Return-to-dock-level mechanism for a dockboard having a hydrauli

1991-07-11

1995-02-28

Pellegrino, Stephen C.

Bridges

Gangway, ramp, or dock leveler

Attached

E01D 100

Patent

active

053924819

ABSTRACT:
A dockboard includes a ramp which is hinged at its rear edge to a loading dock and a lip is hinged to the front edge of the ramp and can be pivoted from a downwardly hanging pendant position to an extended position generally flush with the ramp surface. The ramp is moved from a horizontal position to an upwardly inclined position by a counterbalancing spring assembly and a hydraulic holddown prevents upward movement of the ramp unless manually released. A return-to-dock-level mechanism includes a link that is pivotally connected to the underside of the ramp and an arm interconnects the link with the lip. If the ramp is at a below-dock-level position when a truck pulls away from the dock after loading operation is completed, the lip will fall to its pendant position and the downward movement of the lip is transmitted through the link and arm to pivot the arm into engagement with the release lever of the holddown, thereby releasing the holddown to enable the ramp to be elevated through the counterbalancing spring assembly. As the ramp is elevated to dock-level, the link rides out of contact with the release lever causing the holddown to be re-engaged and prevent further upward movement of the ramp.

REFERENCES:
patent: 3170179 (1965-02-01), Layne
patent: 3201814 (1965-08-01), LeClear
patent: 3271801 (1966-09-01), Dieter et al.
patent: 3699601 (1972-10-01), Hecker, Jr. et al.
patent: 3967337 (1976-07-01), Artzberger
patent: 3997932 (1976-12-01), Artzberger
patent: 4257136 (1981-03-01), Loblick
patent: 4398315 (1983-08-01), Driear et al.
patent: 4727613 (1988-03-01), Alten
patent: 4920598 (1990-05-01), Hahn
patent: 4922568 (1990-05-01), Hageman

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