Ventilation – Having inlet airway – Including automatic control means
Patent
1997-12-18
1999-07-20
Joyce, Harold
Ventilation
Having inlet airway
Including automatic control means
119448, A01K 3118
Patent
active
059249242
ABSTRACT:
Normally closed ventilating elements of a livestock building or the like are opened in response to failure of the supply of electrical power to the building ventilating system, an undesired increased temperature within the building or other undesireable conditions such as the inadvertent opening of one or more of the ventilating elements by a control system which includes a source of direct current electricity arranged so as normallly to energize electromagnets and thereby secure their armatures to the electromagnets. The armatures are secured to the handles of winches which are arranged to operate the building curtains or louvers. Power to the electromagnets is controlled through a semiconductor device acting as a switch which is controlled by monitoring circuits and a time delay network. When a response is required the control system deenergizes the electromagnets so as to free their armatures to rotate with the winch handles to open the building emergency ventilating elements. An automatic means is also provided to notify maintenance personnel when a problem occurs.
REFERENCES:
patent: 3429298 (1969-02-01), Thomason
patent: 3915377 (1975-10-01), Sutton
patent: 4428278 (1984-01-01), Sutton, Jr.
patent: 4605162 (1986-08-01), Crider
patent: 5205785 (1993-04-01), Richardson
patent: 5325813 (1994-07-01), Sutton, Jr.
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