Improvements in and relating to roller doors

Details Improvements in and relating to roller doors Improvements in and relating to roller doors

1991-05-08

1992-11-03

Johnson, Blair M.

Flexible or portable closure, partition, or panel

Roll type

With fabric free edge connected operator

160189, 160310, A47G 502

Patent

active

051599678

ABSTRACT:
A roller door assembly has means for tensioning same wherein a load is applied to a bottom edge of the roller and means for counterbalancing the weight of the door wherein a load is applied to the roller, the loads exerted by both said means being dependent on the amount of door off the roller.

REFERENCES:
patent: 778228 (1904-12-01), Dodge et al.
patent: 3299570 (1967-01-01), Radcliffe
patent: 3303303 (1967-02-01), Miller
patent: 3878879 (1975-04-01), Manns
patent: 4133365 (1979-01-01), Schleicher

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