Door closure
First Claim
1. A telescopic door with spaced apart wall sections consisting of a series of equal parallel side panels, each panel being bent outward on the upper edge and inward in the opposing lower edge in such a way that each side panel easily can be caught by a superposed panel and in turn can catch the next adjoining lower panel when the door is being closed, and forming fixed connections between said side panels maintaining the same at an exact distance from each other, said outward edge bends on the panels being larger than the inward bends of the panels on their opposite edges, whereby the larger bends are supported to glide against the inner side of the adjacent superposed panels, inhibiting scratching by the inward bends against the outer side of the adjoining panels.
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Accused Products
Abstract
A door closure useful as such, but particularly as an air curtain device and process in which laterally spaced-apart parallel sliding sections of a closure formed of separable or pivotally connected vertically mounted panels form a flexible air duct between inner and outer sections connected to a nozzle supported at a bottom outlet between the sections to provide an air screen of homogeneity and resistance to lateral air currents in various open, partially open and closed door positions, by air passed into the top between the sections, from a plenum passing air received from a fixed blower mounted above or near the top of the door within a space enclosed by the walls of the opening.
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Citations
9 Claims
- 1. A telescopic door with spaced apart wall sections consisting of a series of equal parallel side panels, each panel being bent outward on the upper edge and inward in the opposing lower edge in such a way that each side panel easily can be caught by a superposed panel and in turn can catch the next adjoining lower panel when the door is being closed, and forming fixed connections between said side panels maintaining the same at an exact distance from each other, said outward edge bends on the panels being larger than the inward bends of the panels on their opposite edges, whereby the larger bends are supported to glide against the inner side of the adjacent superposed panels, inhibiting scratching by the inward bends against the outer side of the adjoining panels.
- 4. A door closure comprising parallel spaced apart inner and outer walls enclosing an open central air space, each wall being formed of a vertical tier of parallel horizontal panels separably secured edge to edge to be telescopically nestable, one beside the next in an upper plenum chamber, means for raising each wall section for telescopic storage of separated panels within said plenum and lowering as a door closure edge to edge assembly of said panels into parallel walls while maintaining said open central air space.
Specification