Automatic seal crossover system for power and free conveyor on-f

Details Automatic seal crossover system for power and free conveyor on-f Automatic seal crossover system for power and free conveyor on-f

1995-09-14

1996-08-13

Le, Mark T.

Railways

Switches

Having movable track element for slot-guided vehicle

B61B 1000

Patent

active

055445900

ABSTRACT:
The present invention is directed to a seal crossover system which includes two seal plates adjacent to slot crossover portions of separate respective conveyor loops as they diverge (or converge) past a switch in a power and free conveyor system. The seal plates are driven by respective pneumatic cylinders which are pneumatically linked to a switch cylinder such that the seal plates are automatically extended or retracted depending upon the condition of the switch. Thus a respective slot crossover portion of each conveyor loop is selectively and alternately sealed or opened to allow unimpeded passage of a load carriage and a drive trolley, respectively.

REFERENCES:
patent: 228972 (1941-01-01), Pinder
patent: 2688933 (1954-09-01), Spafford
patent: 2840006 (1958-06-01), Henderson
patent: 3518946 (1970-07-01), Kavieff
patent: 4516504 (1985-05-01), Brems et al.
patent: 4542698 (1985-09-01), Wakabayashi
patent: 5033394 (1991-07-01), Summa
patent: 5036773 (1991-08-01), Christen

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