Bunker closure door operating mechanism

Details Bunker closure door operating mechanism Bunker closure door operating mechanism

1978-03-31

1980-06-10

Beltran, Howard

Movable or removable closures

With operator for movably mounted closure

Operating lever or link and closure swing about parallel axes

49248, 49345, 105284, 222556, 298 30, B60P 156, B61D 718, B61D 728

Patent

active

042065712

ABSTRACT:
A bunker closure door mechanism for a bunker housing which has an opening with a seat around the opening which is closed by a closure door body, comprises, first and second spaced apart end levers which are pivotally connected between the housing and one end of the door. In addition, central levers are pivotally connected to the door body intermediate its length and pivotally connected at their opposite ends to a toggle lever which is pivotally mounted on the housing. The door body carries guide pins which are engageable in vertical slots of guide members supported on the bunker housing. By means of an actuator in the form of a fluid-pressure operated piston and cylinder connection, a guide rod is actuated to engage the central lever intermediate its length and to pivot it about its connection to the toggle lever and to also shift the toggle lever over its dead center position. The guide pins ensure that the door is held initially in engagement while the toggle lever is shifted beyond its dead end position to permit lowering of the central lever and the door and then subsequent shifting of the door on its pivotal connections by the end levers to a position at which it may be placed on the side of the bunker housing.

REFERENCES:
patent: 672076 (1901-04-01), Cowell
patent: 974097 (1910-10-01), Seaberg
patent: 1011219 (1911-12-01), McKee
patent: 2867329 (1959-01-01), Miller
patent: 3440761 (1969-04-01), Floehr
patent: 3717110 (1973-02-01), Miller
patent: 3807316 (1974-04-01), Miller

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