Overhead sprinkler head proximity alarm

Details Overhead sprinkler head proximity alarm Overhead sprinkler head proximity alarm

1988-05-03

1989-09-12

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

200 6141, G08B 1300, H01H 316

Patent

active

048664235

ABSTRACT:
A proximity alarm (2) is used to protect overhead sprinkler heads (4) from damage by signaling when an object, typically carried by a forklift, comes too close to the sprinkler head. The alarm includes a signal circuit (24) mounted within a housing (22), a mounting clamp (10) and an arm (20) connecting the mounting clamp and the housing. The clamp secures the alarm to the sprinkler head adjacent the downwardly extending water pipe (8). The signal circuit includes a signal element (30), such as a horn, and a switch (26) for actuating the signal element. The switch is operated by a trigger (32) which extends downwardly from the housing. The trigger includes a portion (38, 44) positioned to contact an object coming close to the sprinkler head. Thus, when a forklift driver is lifting an object and the object contacts the trigger, the trigger actuates the switch causing the signal element to provide a signal, typically an audible alarm, warning the operator to halt movement of the load.

REFERENCES:
patent: 3797746 (1974-03-01), Gray et al.
patent: 4288777 (1981-09-01), Luik
patent: 4311983 (1982-01-01), Piper
patent: 4341488 (1982-07-01), Ryan
patent: 4660648 (1987-04-01), Zen
patent: 4734549 (1988-03-01), Naoi et al.
Grinnell Sprinkler Guards Models F774 8, F776, dated Sep. 1984.

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