Animal husbandry – Bed or rest
Patent
1990-07-06
1991-07-16
Weiss, John G.
Animal husbandry
Bed or rest
160331, F24F 900, A01K 100
Patent
active
050315749
ABSTRACT:
A poultry house having ventilation windows with curtains movable vertically relative to the windows to open the windows incrementally has a control cable associated with each curtain for pulling the curtain upwardly by curtain cords connecting the control cable to the curtain to close the ventilation through the window or to release the pull on the curtain to permit the curtain to drop incrementally and open the window. Each control cable is trained about a control pulley mounted on a power driven rod and is connected at one end to a manually rotatable winch. Other pulleys guide the cable to the control pulley and from the control pulley to the winch. In normal power operation the power driven rod pulls or releases the cable by retraction or extension, but in the event of a power failure the manually operable winch may be utilized to raise and lower the curtains. All of the curtains may be raised and lowered simultaneously during power operation, or may be raised and lowered individually manually by a winch associated with each curtain. The power driven rod may be the piston rod of a hydraulic cylinder, the screw of a screw jack or a rack of a rack and pinion system.
REFERENCES:
patent: 1027028 (1912-05-01), Bailey
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: 4428278 (1984-01-01), Sutton
Ruderman Alan
Weiss John G.
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