Bridges – Gangway – ramp – or dock leveler – Attached
Patent
1988-10-14
1990-05-08
Kisliuk, Bruce M.
Bridges
Gangway, ramp, or dock leveler
Attached
14 711, E01D 100
Patent
active
049225685
ABSTRACT:
An improved dockboard mechanism for a mechanical dockboard. The dockboard includes a frame that is mounted on a loading dock and a ramp is hinged at its rear end to the frame and is movable between a generally horizontal cross traffic position and an upwardly inclined position. The ramp is biased to the upwardly inclined position by a counterbalancing spring. The holddown mechanism includes a cylinder connected to the ramp and a piston is slidable within the cylinder and carries a piston rod which is connected to the frame. The piston is provided with a longitudinal passage which is closed off by a valve member, and an actuating rod is connected to the valve member and extends outwardly of the cylinder. Movement of the rod will open the valve member to permit extension of the piston rod with respect to the cylinder to enable the ramp to pivot upwardly by the counterbalancing spring.
REFERENCES:
patent: 3117332 (1964-01-01), Kelley et al.
patent: 3170179 (1965-02-01), Layne
patent: 3201814 (1965-08-01), Le Clear
patent: 3203002 (1965-08-01), McGuire
patent: 3271801 (1966-09-01), Dieter et al.
patent: 3316575 (1967-05-01), Larsen et al.
patent: 3368229 (1968-02-01), Pfleger
patent: 3646627 (1972-03-01), Potter
patent: 4257136 (1981-03-01), Loblock
Kelley Company Inc.
Kisliuk Bruce M.
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