Ventilation – Having both inlet and outlet airways – Natural ventilation including air passage through rooftop
Patent
1998-07-23
2000-07-18
Joyce, Harold
Ventilation
Having both inlet and outlet airways
Natural ventilation including air passage through rooftop
454364, F24F 702
Patent
active
060899735
ABSTRACT:
In accordance with the present invention, there is provided a new and inexpensive ventilating system for greenhouses using rigid plastic, glazing panels that are thin, lightweight, and quite long. This is achieved by bending outer ends of the glazing panels and lifting to create vent openings. This method takes advantage of the inherent flexibility of these glazing panels to bend them to shift between open and closed positions without the use of a conventional, separate hinged, framework section. Particularly, in accordance with the present invention, an actuator is connected to a flexible bendable portion of the elongated, rigid glazing panel and the actuator lifts and bends an end portion of the panel, which has an inherent flexibility unlike glass or thin films and which has a memory and an elasticity, such that the panel wants to return to its normal unflexed position, which is the closed position, in the preferred embodiment of the invention.
REFERENCES:
patent: 4557183 (1985-12-01), Kolt
patent: 4597324 (1986-07-01), Spilde
patent: 4672889 (1987-06-01), Lynch
patent: 4955287 (1990-09-01), Dupont
patent: 5839233 (1998-11-01), Smit
Boles Derek S.
Joyce Harold
SPS Corporation
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