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US 3,954,544 AGranted
Foam applying apparatus
OwnerThomas Hookerinventor
Life of this patent
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OwnerThomas Hookerinventor
Estimating the term…
An apparatus for in situ preparing and applying foam to a surface, such as a roof, and at the same time applying a membrane onto the surface of the foam, produces a foam-membrane sandwich having an upper surface of controlled smoothness and thickness or pitch, which sandwich is firmly held to the treated surface. The apparatus is normally self-propelled and may be automatically controlled so as to be advanced across the surface to be coated with membrane-covered rigid polymeric foam, preferably of polyurethane foam, as the curing pre-foam and covering membrane are applied. In preferred embodiments of the invention the membrane is a roofing felt or fiberglass web, mat, treated paper or cloth fed from the apparatus from a roll thereon, producing with the roof or other surface to be coated, a form into which a curing pre-foam is deposited as the apparatus is advanced. Also within the invention are processes of producing a membrane-covered, rigid polymeric foam covering on surfaces, such as roofs, by application of a curing pre-foam to the roof under a covering, smoothing and height- or pitch-establishing membrane to which the foam adheres upon curing.
An apparatus useful for in situ preparation of and application of a foam-membrane covering, having an upper surface of controlled smoothness and being of controlled thickness, to a building roof surface to which the foam-membrane covering firmly adheres which comprises means for depositing a fluid, curable pre-foam of a rigid polymeric material onto a roof surface at a location where the foam produced therefrom is held in place on the roof, means for simultaneously laying the membrane a controlled distance away from the roof surface so that expanding foam produced from the applied pre-foam contacts the membrane and holds to it, and means for moving the pre-foam depositing means and the membrane laying means across the roof surface without moving the applied foam and membrane held to it across the roof surface, so that the foam is smoothed by the membrane and the thickness of the applied foam is controlled by the membrane as the foam-membrane covering is applied to the roof surface.
Dependencies are inferred from the claim text.