Patent Publication Number: US-10760333-B2

Title: Double canvas door

Description:
OBJECT OF THE INVENTION 
     The object of the present invention is a double-canvas door, which presents a series of specific construction characteristics that are aimed at simplifying its movement and increasing the watertightness of the chamber formed by the two canvases when the door is in the closed position. 
     FIELD OF APPLICATION THE INVENTION 
     This invention is applicable in the field dedicated to the manufacture of doors, and specifically insulating doors. 
     STATE OF THE ART 
     Doors equipped with two closing canvases mounted on vertical guides and with each upper end secured to a motorized roller, which, when they rotate in one direction or the other cause the respective canvases to roll and unroll, and consequently open and close the door, are known. 
     When the door is in the closed position, the two canvases create an intermediate chamber. 
     The intermediate chamber provides thermal insulation between the two zones separated by the door; the incorporation of a heating set into this type of door to supply temperature-controlled air to the intermediate chamber is also known. 
     A door of this type is described, for example, in utility model ES 1 110 857 U. 
     One of the general drawbacks with this type of door is the complexity of the construction and the cost as a result of the use of two winding rollers and the means required to motorize them. These means of motorization may consist of two motors, one for each roller, or a single motor and a transmission to simultaneously actuate both rollers, as in the case of the aforementioned prior art ES 1 110 857 U. 
     The use of two winding rollers poses a problem of watertightness of the intermediate chamber when the door is closed. Although the winding rollers are housed in an upper cover or housing, the closure of the aforementioned intermediate chamber at the upper end is practically infeasible and causes significant leaks of the temperature-controlled air blown into the chamber. 
     The applicant of the present invention is not aware of the existence of any prior art that satisfactorily resolves the aforementioned issues. 
     DESCRIPTION OF THE INVENTION 
     The double-canvas door of the invention presents a series of construction characteristics that enable it to resolve the aforementioned problem, greatly simplifying the simultaneous movement of the two canvases of the door and closing the top of the intermediate chamber, which significantly improves the insulation of the door in the closed position. 
     To achieve the proposed objectives, a double-canvas door has been developed that comprises a single roller for the simultaneous winding of both canvases and a single drive motor, which greatly simplifies door construction and cost. 
     The upper ends of the canvases are connected to one another and to a band coupled to the winding roller, with this connection closing the upper end of the intermediate chamber that helps keep the temperature and atmospheric conditions inside the door stable when the door is closed. 
     In one embodiment of the invention, to create this connection, the door comprises a connection profile with several parallel slots for securing the ends of the two canvases and a first end of the band coupled to the winding roller. 
     The winding roller comprises a first longitudinal slot to secure the band, and a second longitudinal slot that holds the connection profile, so that when the canvases are in the wound position, the connection between the canvases and the band does not extend beyond the general profile of the winding roller and so that the coupling between the connection profile and the second opening work together to support the tension of the canvases. 
    
    
     
       DESCRIPTION OF THE FIGURES 
       To complement the description that is being provided and in order to provide a better understanding of the characteristics of the invention, a set of drawings is included along with this descriptive summary, in which the following elements have been represented for the purposes of illustration but not limitation: 
         FIG. 1  shows a front elevation of an exemplary embodiment of the double-canvas door according to the invention, in the closed position. 
         FIG. 2A  shows a profile view of the double-canvas door in the previous figure cut by a vertical plane. 
         FIG. 2B  is a detailed close-up view of  FIG. 2A  showing an upper portion of the door. 
         FIG. 3A  shows a plan view from above of the double-canvas door in  FIG. 1  cut by a horizontal plane. 
         FIG. 3B  is a detailed close-up view of  FIG. 3A  showing a side end portion of the door. 
         FIG. 4A  shows a close up profile view of an upper portion of the door, which shows the canvases in the open position. 
         FIG. 4B  is a detailed close-up view of the roller in  FIG. 4A , which shows the connection profile of the canvases and the band, fit into the second longitudinal slot of the shaft. 
     
    
    
     PREFERRED EMBODIMENT OF THE INVENTION 
     As observed in  FIGS. 1 to 3B , this double-canvas door comprises a frame ( 1 ) provided on each side with a pair of guides ( 2   a ,  2   b ) for moving the canvases ( 3   a ,  3   b ) fitted at the lower ends with tension weights ( 31 ) and connected to one another at the upper end by a connection profile ( 4 ) to a band ( 5 ) coupled to a single winding roller ( 6 ) actuated by a drive set ( 61 ) such that when the winding roller rotates in one direction or the other, the two canvases ( 3   a ,  3   b ) simultaneously wind or unwind on the roller ( 6 ) and consequently open or close the door. The upper part of the door is equipped with a cover ( 7 ). 
     As shown in  FIGS. 2A-2B and 3A-3B , the canvases ( 3   a ,  3   b ) create an intermediate chamber ( 8 ) therebetween, which is equipped on the sides with a series of blower nozzles ( 9 ) connected by a series of conduits ( 91 ) to a heating set ( 10 ) responsible for blowing temperature-controlled air into said intermediate space. 
     As shown in the detailed close-up in  FIGS. 2A-2B  and  FIGS. 4A-4B , the door comprises a centering profile ( 11 ) for the canvases ( 3   a ,  3   b ) between the upper end of the guides ( 2   a , 2   b ). 
     As shown in the detailed views of  FIGS. 2A-2B and 4A-4B , the connection profile ( 4 ), in this case with a triangular-shaped general cross-section has several parallel slots ( 41 ) to secure the upper end of the two canvases ( 3   a , 3   b ) and a first end of the band coupled to the winding roller ( 6 ). 
     In this exemplary embodiment, the canvases ( 3   a ,  3   b ) and the band coupled to the winding roller ( 6 ) are secured to the connection profile in a known manner by inserting a series of thicknesses in the canvases ( 3   a ,  3   b ) into the slots ( 41 ) and into the band coupled to the winding roller ( 6 ) created with the respective round beads. 
     The winding roller comprises a first longitudinal slot ( 62 ) to secure a second end of the band coupled to the winding roller ( 6 ), and a second longitudinal slot ( 63 ) that holds the connection profile ( 4 ) when the canvases ( 3   a ,  3   b ) are wound on the roller ( 6 ) as shown in  FIG. 4 . 
     In this wound position, the connection profile ( 4 ) and the connection zones between it and the canvases ( 3   a ,  3   b ) and the band coupled to the winding roller ( 6 ) are recessed with respect to the general cylindrical surface area of the winding roller, avoiding any bumps that could cause marks or deformation of the canvases ( 3   a ,  3   b ). 
     As shown in the detailed view of  FIG. 2B , the connection of the upper end of the canvases ( 3   a ,  3   b ) to the connection profile ( 4 ) closes the top of the intermediate chamber ( 8 ), which helps maintain the existing temperature conditions in the atmosphere of said intermediate chamber ( 8 ). 
     Having sufficiently described the nature of the invention, as well as a preferred embodiment, it is hereby stated for the pertinent purposes that the materials, shape, size, and arrangement of the described elements may be modified, provided that this does not alter the essential characteristics of the invention that is claimed below.