Rite-Hite Corporation

David R Noon

Mark S Ungs

Peter S Schulte

David P Leppert

Floyd D West

Glenn A Nicol

John Olthafer

Richard J Dunkin

John Oltahfer

A door assembly is provided for use in proximity to door openings wherein there is a large amount of material handling vehicle traffic. The assembly includes a frame mounted within the door opening and having upright elongate side sections. Each section has an interior guideway with an elongate entry thereto. Within each section is a pair of guide members forming therebetween a gap aligned with the entry. A flexible door member is slidably mounted on the frame. Opposite marginal side segments of the door member extend through the entries and gaps into the section guideways. Each marginal segment is provided with a plurality of relatively spaced, vertically aligned follower elements normally impassable with respect to the gap. Upon an external force of at least a predetermined magnitude being exerted on an exposed surface of the door member while in a closed mode, the follower elements will exert a predetermined wedging force on the gap-forming portions of the guide members causing a change in the relative dimensions of the gaps and follower elements allowing the follower elements to pass through the gaps and effect at least partial disassembly of the door member from the frame. Each section is provided with an adjustable panel which may be selectively adjusted to an open position exposing the guideway thereby permitting the follower elements to be reassembled in the respective guideway.

Door assembly

A roller door apparatus is provided that includes a roller means and a means journalling the roller means for reversible rotation about a central longitudinal roller axis. The roller door also includes end rail means for a reciprocal linear movement between a first position adjacent the roller means and a second position away from the roller means. Also included is a flexible curtain means with one end attached to the end rail means and the other end attached to the roller means, such that the curtain means closes a door opening with the end rail means in the second position. The curtain means winds onto the roller means when the end rail moves from the second position to the first position and vice versa. The roller door further includes a reversible electric drive motor means coupled to the roller means, and an electrical control means for controlling the drive means during movement of the end rail means for rapid acceleration of the curtain means during an initial portion of each movement, and for control of declaration of the curtain means to zero velocity during a final portion of each movement.

Roller door apparatus

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Dubuque, IA, United States of America

David R Noon