Animal husbandry – Bed or rest
Patent
1991-10-21
1992-06-09
Weiss, John G.
Animal husbandry
Bed or rest
119 22, A01K 100
Patent
active
051197626
ABSTRACT:
A hydrostatic system for controlling ventilation curtains in animal enclosures. A fluid-powered locking system is coupled by hoses to the winch assembly which controls elevation of the ventilation curtains. The locking system comprises a spring-biased piston associated with a rigid cylindrical casing. The casing is sealed by a rigid head and houses a flexible diaphragm which selectively contacts the piston. Fluid pressure is supplied to the casing via hoses coupled to the water line or other fluid source. Fluid entering the casing compresses the diaphragm, which in turn compresses the piston. The rigid piston rod is urged outwardly through the cylinder into frictional engagement with the winch spool. The cylinder at least temporarily locks the spool and thus the curtains at the desired position. A direct current powered solenoid valve maintains pressure to the system. When A.C. power fails, an electronic circuit having a variable timer maintains the system operational for a predetermined, user-selectable period. An alarm is activated to warn of an emergency condition. Thereafter, power to the system is shut off. The solenoid valve reverses, and fluid supplied to the system is vented. As a result, fluid pressure supplied to the piston decreases and the piston retracts out of engagement with the spool. When the spool is released, the ventilation curtains immediately fall, uncovering the windows to increase air circulation through the enclosure.
REFERENCES:
patent: 3042001 (1962-07-01), Dubie et al.
patent: 3429298 (1969-02-01), Thomason
patent: 3474761 (1969-10-01), Thomason
patent: 3915377 (1975-10-01), Sutton
patent: 3973173 (1976-08-01), Smith
patent: 4428278 (1984-01-01), Sutton
patent: 5031574 (1991-07-01), McDowell
Yockey John F.
Yockey Robert E.
Bay Ridge Distibuting, Inc.
Carver Stephen D.
Weiss John G.
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