Movable or removable closures – Closures interconnected for concurrent movement – Moves at different speeds
Patent
1988-09-16
1989-08-01
Kannan, Philip C.
Movable or removable closures
Closures interconnected for concurrent movement
Moves at different speeds
49125, E05F 1700
Patent
active
048523003
ABSTRACT:
A pair of stacking gates or doors has a trailing gate and a leading gate which roll along parallel tracks between a retracted position with the gates approximately side-by-side and an extended position with the leading gate further from the retracted position than the trailing gate. Flexible roller chains are used to retract and extend the gates. A retraction chain has one end connected to an anchor fixed between the gates, is wrapped around a rear idler sprocket on the rear of the trailing gate, and is connected at the other end to the leading gate. An extension chain has one end connected to the fixed anchor, is wrapped around a front idler sprocket near the front of the trailing gate, and is connected at the other end to the rear of the leading gate. As the trailing gate is moved, the idlers move, changing the lengths of the reaches of chain and moving the leading gate twice as far as movement of the trailing gate. U-shaped brackets at the top of the gates maintain the top of the leading gate spaced apart a uniform distance from the top of the trailing gate.
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