Adjustable thresholds and methods of making and using the same
BACKGROUND OF THE INVENTION 
     This application is a continuation-in-part of application Ser. No. 582,979 filed June 2, 1975 now U.S. Pat. No. 4,003,162. 
    
    
     Conventional threshold devices are needed to install on the floor of door openings to provide a transition between floor surfaces and a sealing match between the lower edge of the door and the lower portion of the door opening. 
     Devices which are available are usually limited in that they require removal to alter and thus require additional time and expense and also additional skill. Another limitation is that the devices now available are generally restricted to a linear adjustment along the length of the threshold. 
     SUMMARY OF THE INVENTION 
     It is therefore an object of the present invention to provide an adjustable door threshold the altitude of which is independently adjustable at different points along the length thereof. 
     It is a further object of the present invention to provide such a device, the altitude of which may be adjusted while installed without necessitating the removal of the device. 
     A further object of the present invention is to provide such a device which will provide an air tight seal between the door and threshold. 
     A further object of the present invention is to provide such a device which may be installed and its purposes achieved by persons with less training than that required to install threshold presently available. 
     A further object of the present invention is to provide such a device which is simply and economically manufactured, assembled and used. 
     These together with other objects and advantages which will become subsequently apparent, reside in the details and construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, whrein like numerals refer to like parts throughout, and in which; 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     In the drawings: 
     FIG. 1 is a perspective view of an adjustable threshold device constructed in accordance with and embodying the present invention. 
     FIG. 2 is a sectional view of the device shown in FIG. 1. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring now in more detail and by reference characters to the drawings which illustrate a practical embodiment of the present invention, FIG. 1, is a perspective view of threshold, 1, constructed in accordance with and embodying the present invention. As shown in FIG. 1, device, 1, comprises first partial section, 2, which is provided with a plurality of fasteners, 3, to secure same to the floor, 4, with flexible section, 5, mounted in section, 2, and partial section, 6, and disposed therebetween. Partial sections, 2, and, 6, are shown to each comprise separate portions, 7, and, 8, and, 9, and, 10, respectively. It is clear that these sections, 2, and, 6, may be integrally constructed. Wood screws not shown, are typicaly used to secure section, 6, to floor, 4. 
     Recess portions, 11, and, 12, of sections, 2, and, 6, respectively are shaped as shown to accept the end portions, 13, and, 14, of section, 5, in such a manner so as to facilitate the interlocking of section, 5, with sections, 2, and, 6, as section, 6, is moved towards or away from section, 2. 
     As shown in FGI. 2, adjustment means, 15, comprises screw, 16, nut, 17, and c-ring, 18, and is mounted in recess, 19, in section, 6, and through conventional apertures in sections, 6, and, 2, not shown. Nut, 17, is affixed to portion, 11. Screw, 16, is provided with an annular groove, 22, in which c-ring, 18, is disposed. It is seen from FIGS. 1 and 2 that by rotating screw, 16, to advance same, section, 6, is caused to move towards section, 2, with member, 20, exerting an opposite spring force against section, 6. The spring force is restrained by c-ring, 18. 
     It is readily apparent that as sections, 6, and, 2, are brought together or separated then the uppermost portion, 20, of section, 5, is raised or lowered respectively and thus the uppermost portion is moved nearer or farther from the lower edge of door, 21. 
     It should be understood that changes and modifications in the form, construction, arrangement and combination of the adjustable threshold and methods of making and using the same may be made and substituted for those herein shown and described without departing from the nature and principle of my invention.