Safety device for spring-loaded overhead doors

Details Safety device for spring-loaded overhead doors Safety device for spring-loaded overhead doors

1995-09-29

1997-06-17

Dorner, Kenneth J.

Movable or removable closures

With safety brake or catch

49200, E05F 318, E05D 1300

Patent

active

056386400

ABSTRACT:
A safety device for engagement to the rotary shaft of a spring-loaded overhead door assembly so as to cover an adjustable end of the coil spring which imparts counterbalancing torque to the shaft. The safety device includes a cup-like sheath having a generally cylindrical side wall and an end wall having an axial opening therein. A tubular sleeve extends from the end wall around the opening and a threaded passage is present in the sleeve. A threaded fastener is threaded into the passage, the fastener being recessed in the passage and having a head whose outer surface is uninterrupted except for a plurality of spaced-apart small holes whereby the fastener can only be rotated by a tool which is sized to fit in said passage and which has a plurality of prongs which register with said holes.

REFERENCES:
patent: 1992006 (1935-02-01), Greegor
patent: 2758836 (1956-08-01), Purdy
patent: 3038535 (1962-06-01), Stroup et al.
patent: 3615065 (1971-10-01), Elliott
patent: 3685847 (1972-08-01), Smolka et al.
patent: 4981165 (1991-01-01), Miller et al.

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