Tilt detector for roll-up door

Details Tilt detector for roll-up door Tilt detector for roll-up door

1997-03-27

1999-04-13

Williams, Hezron

Communications: electrical

Condition responsive indicating system

Specific condition

340689, 738659, G08B 108

Patent

active

058942670

ABSTRACT:
The device is based on a tilt-sensing switch of the mercury-bridges-gap type. The device measures the tilt angle of the bottom slat of a roll-down door. If the slat becomes tilted, due for example to one end of the slat becoming snagged in the guideway at the side of the door, the sensor detects the tilt, and arrests the downwards movement of the door, before the slats can spill out and escape from the guideway.

REFERENCES:
patent: 3710369 (1973-01-01), Takahashi
patent: 3827038 (1974-07-01), Willis
patent: 3975723 (1976-08-01), Bowling et al.
patent: 4124847 (1978-11-01), Cashman
patent: 4232309 (1980-11-01), Dillitzer
patent: 4253095 (1981-02-01), Schwarz et al.
patent: 4583081 (1986-04-01), Schmitz
patent: 4593491 (1986-06-01), Carlson et al.
patent: 4633232 (1986-12-01), Nelson et al.
patent: 4868543 (1989-09-01), Binkley
patent: 5402105 (1995-03-01), Doyle et al.

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