Patent ID: 8074697

Claim:
A double curtain rapid opening door, of the type that is made from two continuous canvases or curtains hung at a threshold of the door, an upper part of the threshold of the door having some means of rolling of some strips or vertical bands connected to some intermediary cross pieces distributed along inner faces of both curtains and jointly connected for the vertical gathering up of said curtains by means of the movement of the cross pieces along guides located in both sides of the threshold gathering up the strips wherein the cross pieces have an internal hollow section or hollow with an upper ridge and a lower ridge into which a plurality of openings are made and which are machined for the passage of the strips, wherein the inner faces of the cross piece having integral therewith one or more rounded longitudinal opposed protrusions for the guiding of the strips that reduce the surface of rubbing and separate the strips of the machined openings, said double curtain rapid opening door comprising union strips fixed to different areas of the inner faces of the curtains and with some gaskets at free edges of the union strips and each external side face of each cross piece having at least one groove for fixing, by means of a gasket or thickening, of respective free ends of some union strips to the adjacent curtain, and at least one separator on each lateral of the cross piece, this separator being vertically extended, being made from a band or sheet of a material with less flexion than the curtain and arranged on the inner side of said curtain, operationally suitable to bend towards an outside of the curtain in a controlled manner when the door is gathered up, said cross piece in turn having a ‘T’ shaped groove on each side for the fixing of the separator by a side hem of said separator also having a similar ‘T’ shape; and at least one separator on each lateral of the cross piece, this separator being vertically extended, being made from a band or sheet of a material with less flexion than the curtain and arranged on the inner side of said curtain, operationally suitable to bend towards an outside of the curtain in a controlled manner when the door is gathered up, said cross piece in turn having a ‘T’ shaped groove on each side for the fixing of the separator by a side hem of said separator also having a similar ‘T’ shape.