Bridges – Gangway – ramp – or dock leveler – Attached
Patent
1979-08-23
1981-03-24
Byers, Jr., Nile C.
Bridges
Gangway, ramp, or dock leveler
Attached
E01D 100
Patent
active
042571375
ABSTRACT:
A dock leveler for a dock loading surface is provided with includes a frame fixedly mounted adjacent the front edge of the surface, and an extension assembly mounted on the frame for movement between operative and inoperative modes. The assembly includes a dock panel hinged to the frame and a lip panel hinged to the dock panel. The dock panel is coplaner with the loading surface and the lip panel depends therefrom when the assembly is in the inoperative mode. A linkage is provided having pivotally connected first and second arms. An end of the first arm is pivoted to the frame and an end of the second arm is pivoted to the lip panel. Power means urges the dock panel to move from the inoperative mode to a raised position prior to assuming an operative mode. The dock panel will move to the raised position upon a predetermined external force being applied to the dock panel. A trip member is provided having a central section pivoted to the dock panel. A first end section of the trip member is engaged and moved by the first arm while the dock panel moves to the raised position. A second end section of the trip member engages and causes the lip panel to move to an extended position relative to the dock panel when the first end section is being actuated by the linkage first arm.
REFERENCES:
patent: 3255478 (1966-06-01), Lambert
patent: 3327335 (1967-06-01), Beckwith
patent: 3460175 (1969-08-01), Beckwith
patent: 3486181 (1969-12-01), Hecker
patent: 3497893 (1970-03-01), Beckwith
patent: 3500486 (1970-03-01), Le Clear
patent: 3636578 (1972-01-01), Dieter
patent: 4014486 (1977-03-01), Nelson
patent: 4065824 (1978-01-01), Ellis
patent: 4142640 (1979-03-01), Kummerman
Hipp Steven J.
Wilde Richard C.
Byers Jr. Nile C.
Rite-Hite Corporation
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