Breakaway roll-up door

Details Breakaway roll-up door Breakaway roll-up door

1991-01-25

1992-08-25

Johnson, Blair M.

Flexible or portable closure, partition, or panel

Roll type

With guides or fabric edge holders

160291, 160310, 160265, E06B 917

Patent

active

051410443

ABSTRACT:
A roll-up door in which the bottom bar is attached to the flexible door curtain has a transverse opening at an end adjacent to a jamb of the frame of the door. A breakaway shaft travels in a track in the jamb and has one end that normally seats in the transverse opening and provides a link between the bottom bar and the jamb. The other end of the shaft is restrained so that the shaft is held in a generally horizontal attitude. The opening in the bar and the breakaway shaft have cooperating means to normally retain the shaft in the opening but which are releasable upon a force striking the curtain or bottom bar. The breakaway shaft will separate from the bar upon impact thereby freeing the bar from engagement withthe jamb and preventing damage. The breakaway shaft may thereafter be reinserted into the opening in the bar to reconnect the bottom bar to the track and permit continued operation of the door. The invention further includes a provision for halting the operation of the door upon impact through the use of a switch actuator mounted in the opening in the bar and normally engageable by the breakaway shaft. The actuator is released when the shaft leaves the opening to thereby disable the drive for rolling and unrolling the curtain.

REFERENCES:
patent: 5025847 (1991-06-01), Mueller
patent: 5048588 (1991-09-01), Weishar et al.
patent: 5056579 (1991-10-01), Krafutler

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