Patent Publication Number: US-5522180-A

Title: Automatic door sweep

Description:
RELATED APPLICATION 
     This application is a continuation in part of application Ser. No. 08/083,101 filed on Jun. 25, 1993 now U.S. Pat. No. 5,454,192. 
    
    
     BACKGROUND OF THE INVENTION 
     The invention disclosed herein relates to a device attachable to a closure such as a door or window which automatically moves a sealing portion of the device to insulate a gap between the closure and the opening when the closure is moved to close the opening and which automatically moves the sealing portion away from the opening when the closure is moved to open the opening. Such devices when used to seal the gap at the bottom of a door may be referred to as an automatic door sweep or automatic door drop. 
     The following U.S. patents disclose devices attached to a door which automatically position a sealing portion thereof to contact a surface defining part of the opening closed by the door when the door is closed, and which move the sealing portion away from the surface when the door is opened: U.S. Pat. No. 237,516 (J. E. Gowen); U.S. Pat. No. 483,995 (E. A. Delancy); U. S. Pat. No. 591,809 (D A Brawley et al.); U.S. Pat. No. 639,026 (J. C. Fernald); U.S. Pat. No. 639,831 (G. L. Scoville); U.S. Pat. No. 728,686 (E. Douden et al.); U.S. Pat. No. 746,910 (W. C. Zimmermann); U.S. Pat. No. 1,460,312 (F. Caron); U.S. Pat. No. 1,548,769 (Thompson); U.S. Pat. No. 1,561,195 (A. Szymkowiak); U.S. Pat. No. 1,771,599 (F. C. Wilson); U.S. Pat. No. 1,843,350 (W. Vedder); U.S. Pat. No. 1,978,761 (S. R. Ramsey); U.S. Pat. No. 2,365,403 (E. H. Galford); U.S. Pat. No. 2,422,607 (F. C. Wynne); U.S. Pat. No. 2,848,767 (E. B. Thompson); U.S. Pat. No. 3,054,154  (F. C. Henderson); U.S. Pat. No. 3,072,977 (J. Burda); U.S. Pat. No. 3,281,990 (K. H. Nilsson); U.S. Pat. No. 3,496,676 (E. Halpern); U.S. Pat. No. 4,045,913 (Wright); U.S. Pat. No. 4,320,793 (Lindbergh); U.S. Pat. No. 4,089,136 (Lapinski et al.); U.S. Pat. No. 4,528,775 (Einarsson); U.S. Pat. No. 4,614,060 (Dumenil et al.); U.S. Pat. No. 4,947,584 (Wexler); U.S. Pat. No. 5,010,691 (K. Takahashi); and Australian Patent No. 115,066; Canadian Patent No. 525,261; Belgian Patent No. 507,977; and French Patent Nos. 664,133 and 841,285. Devices for automatically sealing a door bottom upon closing of the door are currently commercially available from Mackelanberg-Duncan of Oklahoma City, Okla. (as the &#34;Door Sweep&#34;) and from Stanely. U.S. Pat. No. 2,587,567 (J. D. Easton) discloses a device for sealing louver blades on a louver window. 
     While such devices appear to more or less achieve the desired sealing function for the door, there is a need for a sealing device which, among other things, is inexpensive to manufacture, easy to install, fits or is adjustable to fit various size openings, may seal against uneven surfaces, is durable and relatively slim, which can be attached to both left and right opening closures (e.g., doors and windows), and which can be mounted to the inside, outside or in an edge of the closure. 
     OBJECTS AND SUMMARY OF THE INVENTION 
     It is an object of the invention disclosed herein to provide an improved device for automatically sealing a closure such as a door or window against the opening closed by the closure by moving a sealing portion or element of the device against the opening in response to closing of the closure. 
     Another object of the invention is to provide such a device which is relatively inexpensive to manufacture and yet performs its sealing function well. 
     Another object of the invention is to provide such a device which is durable and will last for hundreds of thousands of openings and closings of the closure. 
     Another object of the invention is to provide such a device which is easy to install. 
     Another object of the invention is to provide such devices attachable either to any side or in any edge of the closure, and which can be used for the after market and the OEM market. 
     Another object of the invention is to provide such a device which can accommodate different size openings, for example, a device which may be reduced in length without the use of special tools to fit smaller openings and/or expanded in length without the use of special tools to fit larger openings. 
     Another object of the invention is to provide such a device which can accommodate different size gaps between the closure and the opening defining surface that the device seals. 
     Another object of the invention is to provide such a device which can operate with different thickness closures and closures made of different materials (wood, metal, etc.) 
     Another object of the invention is to provide such a device which can be mounted to both left-opening and right-opening closures. 
     Another object of the invention is to provide such a device which can be mounted to the inside of, the outside of, or in an edge of a closure. 
     Another object of the invention is to provide such a device which can seal an opening whether or not it is framed with moldings. 
     Another object of the invention is to provide such a device which seals against uneven surfaces of the opening. 
     Another object of the invention is to provide such a device which is slim and compact. 
     Another object of the invention is to provide such a device which operates with closures that are hinged to the opening or which articulate or slide relative to the opening such as a garage door. 
     Another object of the invention is to provide an esthetic cover for such a device. 
     Another object of the invention is to provide a cover for such a device which cooperates with the device to provide high impact resistance, and which may function as a kick plate. 
     Another object of the invention is to provide a cover for such a device which forms a seal with the device on the inside of the cover to prevent the flow of air around the device and between the cover and the device. 
     Another object of the invention is to provide a cover with a top which covers the top of the device, and end caps which maybe attached without fasteners to close off the ends of the cover. 
     Another object of the invention is to provide such a device in which a sealing element which seals the closure to the opening is replaceable. 
     The invention disclosed herein provides an automatically-actuated sealing device for a closure which includes a support element attachable to the closure, a seal actuating element movably supported by the support element, a sealing element moved by the seal actuating element into a sealing position, and a plurality of spring elements which couple the seal actuating element and the support element and in the closed position of the closure urge the seal actuating element towards the opening, thereby urging the sealing element into its sealing position against a portion or surface of the opening to seal the closure and the opening thereat. 
     Typically there is a gap between a closure and the opening it closes through which weather, dust, insects, etc. may pass. In the specific embodiments illustrated in the drawings, the seal actuating element moves from its sealing position, in which the sealing element is urged into contact with a portion or surface of the opening and closes the gap, to a non-sealing position in which the sealing element does not contact the opening in response to the opening of the closure. Via the spring elements, the support element resiliently supports the seal actuating element for movement relative to the support element towards and away from the support element, and the sealing element is attached to the device in engagement with the seal actuating element so as to move with movement of the seal actuating element. In the preferred embodiments, the seal actuating element is moved from a retracted non-sealing position in which the sealing element is retracted towards the support element and a projecting sealing position in which the seal actuating element is projected away from the support element in response to movement of the closure. 
     In various embodiments, the sealing device may be mounted to or in any edge of the closure, and to the inside of or the outside of the closure, and the sealing device may be mounted to left- or right-opening hinged closures, or to sliding or articulated closures, and may be provided as an after market or OEM device. 
     The spring elements are spaced apart and project transversely from a same side of the support element and/or seal actuating element. In various embodiments, the spring elements may be manufactured one-piece and integrally connected to both the support element and the seal actuating element, thereby forming a one-piece sealing device; or the spring elements may be one-piece and integrally connected to either the support element or the seal actuating element and coupled to the seal actuating element or the support element, respectively; or the spring elements may be two-piece, with a different piece being integrally connected to the support element and the seal actuating element and the two separate pieces of the spring elements coupled together; or the spring elements may be one-piece and coupled to both the support element and the seal actuating element. The spring elements may be made of plastic or metal, and a sealing device may have all plastic spring elements, all metal spring elements or both plastic and metal spring elements. When the sealing device includes metal spring elements, the plastic spring elements need not perform the primary spring function, and may simply serve to connect the support element and the seal actuating element. In such embodiments, the plastic spring elements for convenience may still be referred to herein as spring elements, or as strips, etc. 
     The spring elements not only support the seal actuating element from the support element, they also actively participate in moving the seal actuating element between its sealing and non-sealing positions. The sole coupling between the support element and the seal actuating element is through the spring elements. Use of the spring elements for both support and movement of the seal actuating element simplifies construction of sealing devices according to the invention. 
     The support element, the seal actuating element and all of the spring elements may be made entirely of plastic material, for example, made by injection molding, or by die cutting pre-formed sheets. In one embodiment, the sealing device is made injection molded in one piece with all of the spring elements integrally connected to both the support element and the seal actuating element. The plastic material is preferably one that does not substantially affect performance of the device over a wide temperature range so that the device may be mounted to the outside (weather side) of a closure. In one embodiment, the plastic material is copolymer polypropylene, which is currently used extensively for so-called living hinges. In another embodiment where metal spring elements are employed, it is a thermoplastic olefin (which is currently used in automobile bumpers for great impact strength). 
     In the embodiments in which the spring elements are not one piece or not integrally connected to the support element or the seal actuating element, interlocking structure is provided for coupling the spring elements to each other or the support element and/or the seal actuating element such that the support element supports the seal actuating element for movement relative to the support element and urges the sealing element into contact with the opening as described above. Such interlocking structure does not require the use of fasteners for coupling the spring elements. Preferably, the spring elements, the support element and the seal actuating element are assembled such that the spring elements are not stressed in the closed position of the closure. 
     In the presently preferred embodiment, the support element and the sealing element are made of plastic, and some spring elements are made of plastic and at least one spring element is made of metal, e.g., spring steel. Here the plastic spring elements need not perform the primary spring function, which is provided by the metal spring element(s). In this preferred embodiment, the support element, the seal element and some of the spring elements are integrally connected as one piece, and means are provided for engaging one or more metal spring elements with the support element and the seal element. The one-piece support element/seal element/spring element device is made entirely of plastic and may be made as described above. In accordance with the preferred embodiment, the metal spring elements are assembled into the one-piece device after the one-piece device has been made, although the one-piece plastic device may be molded to one or more metal spring elements or one or more spring elements may be inserted into a molded one-piece device before hardening thereof to integrally join the metal spring element or elements to the support element and/or seal element. 
     The sealing device including the spring elements and excluding the sealing element may be made entirely of plastic, entirely of metal, or as presently preferred, partly of plastic and partly of metal. 
     In one embodiment, the sealing device comprises a first one-piece member comprising an elongated support element attachable to the closure member and a plurality of spaced first spring elements connected at one end to the support element and projecting transversely therefrom; a second one-piece member comprising a seal actuating element and a second plurality of spaced spring elements connected at one end to the support element and projecting transversely therefrom; and the interlocking structure described above for the spring elements. 
     The sealing device in different embodiments may be constructed such that the spring elements are stressed in the open position of the closure and relatively relaxed in the closed position of the closure, and vice versa. In the embodiments in which all or part of the spring elements are integrally connected to the support element and/or the seal actuating element, the spring elements may be molded &#34;long&#34;, resulting in them being unloaded or relaxed when the closure is closed, and loaded or stressed when the closure is opened; or they may be molded &#34;short&#34; resulting in them being loaded or stressed when the closure is closed and unloaded or unstressed when the closure is opened. In the molded-long condition, the spring elements are in their naturally relaxed, long position, which reduces the plastic creep of the springs since the closure generally remains closed over long periods. It is preferable if the sealing device can be constructed so that the spring elements are relaxed in the closed position of the closure since typically a closure will be closed most of the time and this construction will increase the service life of the sealing device. However, depending upon the particular embodiment of the sealing device and the location at which it is mounted to the closure, the preferred construction is not always possible. 
     Sealing devices according to the invention operate by coupling the device to a surface defining part of the opening (or a surface coupled thereto) (&#34;opening defining surface&#34;) so that opening and closing of the closure generates movement of the seal actuating element. Means are therefore provided for coupling the seal actuating element to the opening defining surface to move the seal actuating element relative to the support element. In some embodiments, the spring elements are configured and connected such that lateral movement of the seal actuating element in one direction moves the seal actuating element away from the support element and lateral movement in an opposite direction moves the seal actuating element towards the support element. In those embodiments, the means for coupling and the spring elements cooperate to laterally move the seal actuating element between the non-sealing retracted position and the projecting sealing position, and the spring elements are stressed in the closed position of the closure. The means for coupling may comprise a projection or cam follower on the seal actuating element adapted to be engaged by the opening defining surface (e.g., a part of a door jamb) or a bearing element or cam element coupled to the opening defining surface, during opening and closing of the closure. When the closure is closed, the projection bears against the opening defining surface and causes the seal actuating element to be moved laterally in one direction into the projecting sealing position thereof. In the projecting sealing position of the device, the support element and the sealing element are aligned. When the closure is moved from the closed position thereof, the projection is adapted to move out of contact with the opening defining surface to cause the seal actuating element to move in the opposite lateral direction to the retracted non-sealing position thereof, in which the seal actuating element is offset from the support element approximately by the length of the projection. 
     The coupling means may comprise the edge of a door jamb, or a bearing element or cam element mounted to or adjacent to the edge of the door jamb against which the projection on the seal actuating element bears. Depending on whether the inventive sealing device is attached to the inside of, the outside of, or in the closure, the bearing element or cam element may be located on the hinge side of a hinged closure or the opposite side, and may be located on the edge of the opening or projecting from the edge of the opening. Whether or not the opening is framed with moldings will also determine the location of the bearing element or cam element. Preferably, the bearing element, cam element and/or the projection is made adjustable to facilitate installation of the sealing device. Such adjustability can also compensate for wear, plastic creep and/or other changes in the sealing device and closure. 
     In the preferred embodiments, the cam or bearing element is provided attached to the surface opening defining on the hinge side thereof, to be engaged by the projection on the seal actuating element for camming the seal actuating element to progressively move the seal actuating element laterally in opposite directions as the closure is moved into and out of its closed position. In one embodiment, the cam element has camming surfaces extending in two directions so as to cam the seal actuating element laterally and towards and away from the support element. The configurations of the cam element and projection affect the speed with which the seal actuating element is moved during opening and closing of the closure. Preferably, the seal actuating element is quickly moved out of contact with the defining surface opening as the closure is opened, and makes contact with the opening defining surface at the last possible moment when the closure is closed. This is particularly advantageous for a sealing device mounted to a door bottom which moves over carpeting so that the sealing element is quickly raised above the top of the carpeting pile when the door is opened. In the preferred embodiment, the projection comprises a threaded rod received in an end of the seal actuating element, and is adjusted by rotation of the threaded rod. 
     In another embodiment of the sealing device, only two spring elements are configured, which direct movement of the seal actuating element towards and away from the support element while restraining lateral movement of the seal actuating element. The means for coupling the sealing device to the opening defining surface and the spring elements cooperate to move the seal actuating element towards and away from the support element with substantially no lateral movement of the seal actuating element. In this embodiment, the spring elements are unstressed in the closed position of the closure, and the means for coupling comprises an elongated flexible element with one end attached to the seal actuating element and the other attached to the opening, defining surface which moves the seal actuating element from the projecting sealing position to the retracted non-sealing position. 
     The support element may be mounted on the outside of, or the inside of the closure, and a cover is provided to cover all of the support element and all or substantially all of the seal actuating element while permitting movement of the seal actuating element. The cover may act as a kick plate, and/or may be decorative, etc. Preferably, means are provided for attaching the cover to the sealing device or closure without fasteners e.g., means for snap-fitting the cover to the support element or the closure or means which engage as the cover is slid onto the sealing device or door. 
     The cover may be provided with a top and ends for closing off the top and ends of the sealing device. In the preferred embodiment, the top is integral with the cover and closes off the top of the sealing device, and ends are provided which are snap fitted to engage the sealing device and/or cover, and preferably to engage both. The cover is preferably constructed to cooperate with the sealing device to enhance the impact resistance of both the cover and the sealing device. The cover preferably includes a means cooperating with the sealing device for providing an air seal between the inside of the cover and the sealing device so as to eliminate or reduce leakage from the exterior side of the sealing device around the sealing device. In the preferred embodiment no separate fasteners are required to attach the cover to the sealing device and to close off the top and ends of the sealing device. 
     In another embodiment, the sealing device is mounted within the closure. In that embodiment, which may be referred to a &#34;mortise mounted&#34; sealing device, a channel member is provided and means attach the support element within the channel member while permitting movement of the seal actuating element within the channel with the same motion as described above. In this embodiment, the coupling means may comprise a bearing element or cam element attached to the edge of the opening defining surface, e.g., a door jamb. 
     In accordance with the invention, the sealing device may be provided with means for easily reducing or expanding the length thereof to fit various size closures. In an embodiment in which the length of the sealing device may be reduced, the sealing device is provided large enough to fit a predetermined large opening, and means are provided for easily reducing the length of the sealing device to fit smaller openings. In that embodiment, the support element, the spring elements and the seal actuating element have a plurality of laterally spaced, aligned pre-weakened portions adjacent at least one end of the device by means of which the device may be severed easily along the aligned pre-weakened portions by stressing, cutting, or the like along the aligned pre-weakened portions. The sealing device may be secured to the closure by screws, and screw holes are provided in the support element for that purpose. In the embodiment which includes a metal spring or springs, the metal spring or springs and the screw holes are positioned so that the device may be severed at a location such that the shortened sealing device retains an appropriate number of metal springs and screw holes for the most common door lengths. 
     In an embodiment in which the length of the sealing device may be extended, modules of the sealing device may be provided which are easily joined together to modularly expand the device. One or more of the modules may be reducible in length as discussed above. For example, a base sealing device and one or more extension sealing sections may be provided. The support element and the seal actuating element of the base sealing device include at least one end thereof means for connecting thereto the support element and seal actuating element, respectively, of the extension sealing section. In that embodiment, pegs or projections on one of the devices may be friction fitted into respective hollow ends of the other section to join the respective base sealing device and extension section. In another embodiment, strips may bridge the edges of adjacent support elements and adjacent seal actuating elements, and be attached thereto. 
     The sealing device according to the invention is constructed so that it may be mounted to either a right-opening or a left-opening closure simply by reversing the sealing device end-to-end. Therefore, in embodiments which include a projection which bears on a cam element, bearing member or the opening, the pre-weakened portions are provided only at the end of the sealing device without the projection so that the device may only be severed at that one end. However, such a sealing device is capable of being mounted to right-opening or left-opening closures simply by reversing the device end-to-end. While embodiments in which the coupling means do not include a projection may have pre-weakened portions at both ends, the pre-weakened portions are preferably provided only at one end in order to increase the length by which the sealing device may be reduced, as described below. 
     The cover for all embodiments is symmetrical about its center line so that it may be used for sealing devices mounted to either a left-opening or a right-opening closure. Separate covers may be provided for the base sealing device and the extension section of the modularly expandable device which butt against each other, giving the appearance of a single cover. 
     In one embodiment, the seal actuating element comprises a plurality of specially shaped and specially connected members extending laterally relative to the support element flexibly interconnected or articulated such that at least one of the members of the seal actuating element may move or bend independent and relative to an adjacent member, whereby when the closure member is in its closed position, the seal actuating element may move the sealing element into sealing engagement with an inclined or uneven surface. 
     The invention also provides a means for facilitating custom alignment in the mounting of the sealing device to a closure. Such means hold the seal actuating element a predetermined distance (e.g. corresponding to the maximum stroke (extension) of the seal actuating element) from the support element during installation of the device on the closure member. In the preferred embodiments, at least one spacer element is provided which engages both the support element and the seal actuating element under action of the spring elements to maintain the support element and the seal actuating element the predetermined distance apart. In one embodiment, the spacer element is integral with and pivotally attached to the support element and may be pivoted to engage one or more projections on the seal actuating element (or vice versa). In another embodiment, the spacer element is removable and is engaged by means of spaced projections on the spacer element and holes in the support and seal actuating elements (or vice versa). The sealing device may be used as a template to mark holes in the closure which can be predrilled to accept screws by means of which the sealing device may be mounted to the closure. 
     The sealing element preferably is made of a flexible weather-strip material, e.g., EPDM, and is preferably constructed so in the sealing position to contact the opening along a plurality of laterally spaced areas. The sealing element is preferably hollow so as to enhance its flexibility and allow the sealing element to compress and make good contact with the opening. The sealing element and the bottom of the seal actuating element are structured so that the sealing element may be easily attached to the seal actuating element without fasteners, adhesives, etc., e.g., by a friction-like fit in a channel of the seal actuating element. 
     The sealing devices disclosed herein may be provided as after market devices, even the mortise mounted sealing device for &#34;handy&#34; and skilled persons, and as OEM devices. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention is illustrated in the figures of the accompanying drawings which are meant to be exemplary and not limiting, in which like numerals refer to like or corresponding parts, and in which: 
     FIG. 1 is a front perspective view of a sealing device according to the invention, with the cover partially broken away, mounted to the bottom of a door on the inside thereof, in which the door is shown in its closed position and the sealing device is shown with its sealing element in its projecting sealing position contacting a saddle below the door; 
     FIG. 2 is a view similar to that of FIG. 1 with a different part of the sealing device broken away and showing the door partially opened and the sealing element of the device in a retracted non-sealing position out of contact with the saddle and the floor; 
     FIG. 3 is a front elevation view of the sealing device of FIG. 1 mounted to the bottom of the door showing in solid lines the sealing element in its retracted non-sealing position and in broken lines the sealing element held by a spacer element in its projecting installation position; 
     FIG. 4 is an exploded perspective and section view of the sealing device of FIG. 1; 
     FIG. 5 is a vertical section view of the sealing device and door of FIG. 2 taken with the door opened; 
     FIG. 6 is a vertical section view of the sealing device and door of FIG. 1 taken with the door closed; 
     FIG. 7 is a horizontal section view taken along different lines through the sealing device, closed door, door jamb and molding shown in FIG. 1; 
     FIG. 8 is a horizontal section view taken along different lines through the sealing device, opened door, door jamb and molding shown in FIG. 2; 
     FIG. 9 is a perspective view of the lower part of the hinge side of the door jamb and the hinge side of the floor saddle shown in FIG. 1, with the door removed, showing a cam element; 
     FIG. 10 is a front elevation view of the cam element depicted in FIG. 9; 
     FIG. 11 is a front perspective view of a sealing device according to another embodiment of the invention, with the cover partially broken away, mounted to the bottom of door on the inside thereof, in which the door is shown in its closed position and the sealing device is shown with its sealing element in its projecting sealing position contacting the floor below the door; 
     FIG. 12 is a view similar to that of FIG. 11 of the sealing device of FIG. 11 with a different part of the sealing device broken away and showing the door partially opened and the sealing element of the device in a retracted non-sealing position out of contact with the floor; 
     FIG. 13 is a front elevation view of the sealing device of FIG. 11 mounted to the bottom of the door with the door closed and the sealing element in its projecting sealing position contacting the floor; 
     FIG. 14 is a vertical section view of the sealing device and door of FIG. 11 taken with the door closed; 
     FIG. 15 is a vertical section view of the sealing device and door of FIG. 11 taken with the door open; 
     FIG. 16 is a front elevation view of the sealing device and door of FIG. 11 illustrating movement of the seal actuating and sealing elements of the sealing device from the full line position when the door is partially or fully opened as in FIGS. 12 and 15 to the broken line position when the door is closed as in FIGS. 11, 13 and 14; 
     FIG. 17 is a section view of the sealing device and door of FIG. 11 taken along line 17--17 in FIG. 16; 
     FIG. 18 is a section view of the sealing device and door of FIG. 11 taken along line 18--18 FIG. 16; 
     FIG. 19 is an exploded side sectional view of the sealing device and door of FIG. 18 but with the cover of the sealing device separated from the sealing device; 
     FIGS. 20 and 21 are front perspective views of a part of the sealing device of FIG. 11 illustrating use of spacers which maintain the device in a predetermined configuration during installation of the device; 
     FIG. 22 is a front elevation view of the sealing device and door of FIG. 11, with the cover removed and the spacers of FIGS. 20 and 21 inserted into the device; 
     FIG. 23 is a section view of the sealing device and door of FIG. 11 without the cover and including the spacers of FIG. 20 taken along line 23--23 in FIG. 22; 
     FIG. 24 is a perspective view of another embodiment of a cam element employed with the sealing device of FIG. 11 showing a part of the sealing device of FIG. 11 with the door in the closed position; 
     FIG. 25 is a top view of the cam element and sealing device of FIG. 24 showing the door in its closed position and a partially open position. 
     FIG. 26 is a section view of the cam element and sealing device of FIG. 24 taken along line 26--26 in FIG. 25; 
     FIG. 27 is a section view of the cam element and sealing device of FIG. 24 taken along line 27--27 in FIG. 25; 
     FIG. 28 is a front perspective view of the sealing device of FIG. 11 without the cover prior to installation illustrating adjustment of the length of the device by severing an end of the device along one of a plurality pre-weakened portions of the device; 
     FIG. 29 is a section view of the sealing device as shown in FIG. 28 taken along line 29--29 in FIG. 28; 
     FIG. 30 is a front elevation view of the sealing device shown in FIG. 29 in which broken lines indicate the device before the end thereof is severed and solid lines indicate the device after the end thereof is severed; 
     FIG. 31 is front exploded perspective view of the sealing device of FIG. 11 mounted to a left-opening door, in which the cover is separated from the sealing device; 
     FIG. 32 is a front exploded perspective view similar to that of FIG. 31 but showing the same sealing device as in FIGS. 11 and 31 but mounted to a right opening-door; 
     FIGS. 33 and 34 are front perspective views of an embodiment of a mortise mounted sealing device according to the invention which is mounted within the bottom of the door, FIG. 33 showing the sealing device with its sealing element in its projecting sealing position in contact with the floor in the closed position of the door and FIG. 34 showing the sealing element in its retracted non-sealing position out of contact with the floor in a partially open position of the door; 
     FIG. 35 is a section view of the sealing device and door of FIG. 33 taken along line 35--35 in FIG. 33; 
     FIG. 36 is a section view of the sealing device and door of FIG. 33 taken along line 36--36 in FIG. 34; 
     FIG. 37 is an exploded perspective view of the sealing device and door of FIG. 33 with the door partially broken away and the sealing device separated from the door; 
     FIG. 38 is a front elevation view of another embodiment of a sealing device (unmounted and without the cover) according to the invention which is especially suited for use with uneven floor surfaces; 
     FIG. 39 is a front elevation view of the sealing device of FIG. 38 illustrating sealing of an uneven floor surface; 
     FIG. 40 is a front exploded perspective view of another embodiment of a modular sealing device (unmounted and without the cover) according to the invention showing a base sealing section and an extension sealing section separated from the base sealing section, which is especially suited for use with wide doors; 
     FIG. 41 is a front elevation view of the sealing device of FIG. 40 shown with the base and extension sections joined; 
     FIG. 42 is an exploded perspective view of a sealing device according to another embodiment of the invention having snap-in spring elements, depicting a spring element separated from the remainder of the device with the cover broken away; 
     FIG. 43 is a section view of the sealing device of FIG. 42 taken along line 43--43 in FIG. 42; 
     FIG. 44 is a front elevation view of the sealing device of FIG. 42 mounted to a left-opening door showing the sealing element of the device in its projecting sealing position in contact with the floor in the closed position of the door; 
     FIG. 45 is a front elevation view of the sealing device and door of FIG. 42 showing movement of the sealing element of the device from the projecting sealing position thereof in the retracted non-sealing contact with the floor (broken-lines) to position thereof above the floor (solid lines) when the door is opened; 
     FIG. 46 is a front elevation view of the sealing device of FIG. 42 mounted to a right-opening door depicting the device in the closed position of the door; 
     FIGS. 47 and 48 are front elevation views of another embodiment of a sealing device according to the invention having spring elements integrally attached to one or both elements of the sealing device; 
     FIG. 49 is a front perspective view of another embodiment of a sealing device according to the invention mounted to a door, in which the movable part of the device is coupled to the door jamb differently than in the embodiment of FIG. 1, shown with the cover broken away and the door in its closed position with the sealing element in its projecting sealing position in contact with the floor; 
     FIG. 50 is a front perspective view of the sealing device and door of FIG. 49 shown with the door partially opened and the sealing element of the device in its retracted non-sealing position out of contact with the floor; 
     FIG. 51 is a front perspective view of a sealing device according to still another embodiment of the invention mounted to the bottom of a door on the outside thereof, with the door being shown in its open position and the sealing device with its sealing element in its retracted position not in contact with a saddle below the door; 
     FIG. 52 is an exploded view of the end portion of the sealing device of FIG. 51 on the unhinged of the door and the end portion of the cover depicted in FIG. 51 on the hinged end of the door; 
     FIG. 53 is a front elevation view of the sealing device of in FIG. 51; 
     FIG. 54 is a cross section view of the sealing device, cover and a portion of the door of FIG. 51 taken along line 54--54 in FIG. 51, showing the seal actuating element and the sealing element in their retracted positions; 
     FIG. 55 is a cross section view similar to that of FIG. 54 but showing the sealing element in its projecting position in contact with the floor below the door; 
     FIG. 56 is a front elevation view of a part of the sealing device of FIG. 51 mounted to the door with the cover not shown, which in broken lines depicts a spacer element in its storage position and the sealing element in its retracted position, and in solid lines depicts the spacer element engaging a stop to project the sealing element into its installation position; 
     FIG. 57 is an exploded front perspective view of the sealing device of FIG. 51 illustrating assembly of a metal leaf spring; 
     FIGS. 58 and 59 are front elevation views of the end portion of the sealing device of FIG. 51 on the hinged end of the door mounted to the door with the cover not shown, depicting in FIG. 58 the sealing element in its retracted position and in FIG. 59 the seal actuating element of the sealing device cammed by a bearing plate screwed to the door jam to project the sealing element into its projecting sealing position; 
     FIG. 60 is a perspective view of the end portion of the sealing device and cover depicted in FIG. 51 on the hinged end of the door, with the end cap secured thereto; 
     FIG. 61 is an exploded perspective view of the end portion of the sealing device of FIG. 51 on the hinged end of the door illustrating assembly of the left end cap; 
     FIGS. 62 and 63 are left side (relative to FIG. 61) elevation and right end elevation views, respectively, of the end cap depicted in FIG. 61; 
     FIG. 64 is an exploded perspective view of the end portion of the sealing device of FIG. 51 on the unhinged end of the door illustrating assembly of the end cap for that end; 
     FIG. 65 is a horizontal section view through the right end of the sealing device and end cap depicted in FIG. 64; 
     FIGS. 66 and 67 are right side (relative to FIG. 64) elevation and left end elevation views, respectively, of the end cap depicted in FIG. 64; and 
     FIG. 68 is a perspective view of a portion of a composite extended sealing device made from adjacent sealing devices which are attached together by strips bridging respecting support elements and seal actuating elements of the sealing devices. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The drawings illustrate embodiments of sealing devices according to the invention for a closure in the form of a door, specifically, a door which pivots to open and close an opening. The drawings further illustrate that the sealing devices are attached to the bottom of the door and seal the door to a floor which defines part of the opening. However, the invention is applicable to: closures other than doors, e.g., windows; to closures than those which pivot, e.g., sliding closures such as garage doors and pocket doors; and to sealing the sides and or the top of a closure as well as the bottom of the closure. 
     Referring to FIGS. 1-6, sealing device 50 according to one embodiment of the invention is attached to the bottom of a door 55 and automatically causes a sealing element 57 thereof to contact and seal against a floor saddle 58 (or a bottom door sill or the floor 60) when door 55 is fully closed (FIGS. 1, 3 and 6), and to move out of contact with floor 60 as door 55 is opened (FIGS. 2 and 5). Sealing device 50 includes an elongated support element 65 which is attached to door 55, an elongated seal actuating element 67 movably supported from support element 65, the sealing element 57 attached to seal actuating element 67, and a plurality of spring elements 70 in the form of flexible strips coupled to movably and resiliently support seal actuating element 67 from support element 65. Sealing element 57 is attached to seal actuating element 67 so as to project from the bottom thereof, and is made of a flexible and/or resilient material so that when urged against saddle 58 (or floor 60 or carpeting (not shown)) in the sealing position of seal actuating element 67 shown in FIGS. 1 and 6, sealing element 57 complies with the saddle (or floor surface), even one that is not exactly flat and not exactly horizontal, and forms a positive seal against weather, dust, insects, etc. The bottom of seal actuating element 57 has a slot 79 (FIG. 4) therein into which a solid, ridged section of seal element 57 is inserted. Sealing element 57 includes the solid ridged section which is engaged within slot 79 and a hollow sealing section which projects from slot 79 and from seal actuating element 67. The shape for sealing element 57 shown in FIGS. 4-6 is exemplary. FIGS. 14 and 40 show other shapes for sealing elements 57a and 57d and slots 79a and 79d. Preferably, sealing elements 57, 57a, 57d are replaceable. 
     In the embodiment illustrated in FIGS. 1-6, spring elements 70 are connected at opposite ends thereof to support element 65 and seal actuating element 67. More specifically, spring elements 70 are integrally formed connected during manufacture to support element 65 and seal actuating element 67. For example, as presently preferred, spring elements 70 are homogeneously formed as one piece with support element 65 and seal actuating element 67. Other ways for coupling spring elements to the support element and the seal actuating element are described herein. Still other ways will be apparent to those of skill in the art. 
     Spring elements 70 constitute the sole support for seal actuating element 67 from support element 65 and act as a means for coupling the support and seal actuating elements, and are constructed and/or are coupled to support element 65 such that seal actuating element 67 may resiliently move towards and away from support element 65 while at the same time moving laterally with respect to support element 65, as indicated by the arrows in FIGS. 1-3. No other support or guiding structure need be provided for the embodiment of sealing device 50 depicted in FIGS. 1-2. FIGS. 1 and 6 show seal actuating element 67 in its projecting sealing position in which it is projected away from support element 65, and FIGS. 2 and 5 show seal actuating element 67 in its retracted non-sealing position in which it is closer to support element 65 than in its position in FIGS. 1 and 6 also laterally displaced to the left (as mounted to a left opening door) compared to its position in FIG. 1. The movement of seal actuating element 67 between the projecting sealing position of FIGS. 1 and 6 and the retracted non-sealing position of FIGS. 2 and 5 occurs automatically in response to the opening and closing of door 55 due to interaction between a projecting end 73 of seal actuating element 67 and a cam element 75 (the coupling means) projecting beyond the edge of door jamb 77 and molding 78. The embodiment of cam element 75 depicted in FIGS. 1, 2 and 7-10 is suitable for use with a door opening that is framed with moldings 78 or with a door opening without moldings. In either case, the end 76 of cam element 75 projects beyond door jamb 77 (FIGS. 7-9) on the hinge side of the door so that it is contacted at approximately an angle of 90° by projecting end 73 of sealing device 50 during initial opening and final closing of the door. In the embodiment depicted in FIGS. 1-2 and 7-10 cam element 75 has a curved or beveled outer end 76 which guides projection 73 onto the remainder of cam element 75. Cam element 75 moves seal actuating element 67 laterally, and spring elements 70 in cooperation with projection 73 and cam element 75 move seal actuating element 67 vertically up and down as door 55 is opened and closed. 
     Cam element 75 (FIG. 9) essentially has only a one-direction camming surface which extends horizontally relative to door jamb 77 and molding 78 to cam projection 73 (FIG. 7) horizontally. The extent to which the end of cam element 75 projects is shown in FIGS. 7 and 8 in which the door hinges are represented in broken lines. The horizontal position of cam element 75 and the distance away from the opening at which it contacts projection 73 determine how long it takes to cam projection 73 to a sealing position of the device or to cam it towards the non-sealing position of the device (the &#34;drop speed&#34; of the device). The configuration of the cam element and the projecting end 73, and adjustment of the cam element will increase or decrease the tension on the spring elements and change the &#34;drop speed&#34;. A high drop speed is preferred for applications in which the door moves over carpeting so that the sealing element may be moved quickly above the height of the carpet pile to clear the tops of the pile. Slower drop speeds are suitable for non-carpeted floors since the sealing element need only be moved slightly above the floor surface to clear the floor surface. 
     Cam element 75 has two holes 79 (FIG. 10) extending lengthwise in the central part of cam element 75, and is attached to door jamb 77 by screws 80. Holes 79 may be made slotted (not shown) to allow for adjustment of cam element 75 during installation and use to compensate for different doors, door jambs and moldings (if any), and for changes occurring during use due, for example, to wear, changes in the characteristics of the spring elements 70, creep of the sealing device if it is made of plastic, etc. In another embodiment of a cam element (cam element 75a depicted in FIGS. 11-12 and 24-27), the cam element has a two-direction camming surface (surface 120 in FIG. 25) which cams the projection on the seal actuating element both laterally and vertically. In the presently preferred embodiment, a flat bearing plate 75b (FIG. 51 ) is provided. 
     Referring to FIG. 1, sealing device 50 is mounted to door 55 such that (a) in the closed position of the door, seal actuating element 67 urges sealing element 57 against saddle 58 with sufficient force to effect a positive seal of sealing element 57 against saddle 58 with projecting end 73 of seal actuating element 67 bearing against cam element 75; and (b) in the partially opened position of door 55 shown in FIG. 2, sealing element 57 is spaced above and not in contact with saddle 58 and floor 60. 
     Spring elements 70 are structured to operate as follows. They are slender enough to function as leaf springs and robust enough to resiliently support sealing actuating element 67 from support element 65 and urge seal actuating element against floor 60 (through seal element 57) to make a positive seal with floor 60. Thus, spring elements 70 constitute the sole support for seal actuating element 67 and participate in moving seal actuating response element 67 in opening and closing the door. The angle at which spring elements 70 extend between support element 65 and seal actuating element 67 allows for the desired movement of seal actuating element 67 towards and away from support element 65 without over-stressing spring elements 70, while providing sufficient spring action to accommodate the desired movement of seal actuating element 67 while providing the good seal mentioned above. The degree of flexing required of spring elements 70 is illustrated in FIG. 3. 
     A cover 81 in the form of an elongated plate is attached to support element 65, but may be attached directly to door 55, or to both door 55 and support element 65. The cover 81 is preferably opaque, and is preferably paintable or supplied in different colors, or is in some way decorative. Cover 81 may function as a kick plate, and if so, is constructed accordingly, e.g., of crack-resistant plastic or of sheet metal such as aluminum or brass. Typically, the seal actuating element 67 will be smooth, as will cover 81, so that friction on seal actuating element 67 is not a problem. However, if desired or necessary, any suitable means may be used to reduce sliding friction on seal actuating element 67. For example, seal actuating element 67 may be made of a low friction material so as not to substantially impede movement thereof relative to cover element 67 and door 55. Cover 81 may also be made of a low friction material and cover 81 may be mounted so as to only lightly contact or be closely spaced from seal actuating element 67. Cover 81 may be attached to sealing device 50 without the use of fasteners by means of, for example, an interlocking slide fit as shown in FIGS. 4-6 and 52, or an interlocking snap fit as shown in FIGS. 17-19. 
     Referring to FIGS. 4-6, dove tailed shaped recesses 82 are provided on both sides of support element 65, and a mating dove tail shaped projection 83 is provided on the inside of cover 81. Cover 81 is attached to support element 65 by inserting the edge of projection 83 into the beginning of the recess 82 facing away from door 55 and sliding cover 81 onto support element 65. Cover 81 includes a top flange 84 which slides over and covers the top of support element 65. Since sealing device 50 may be reversed from the position shown in FIGS. 5 and 6 when attached to a right-opening door (as discussed below), a dove tail shaped recess 82 is provided on both sides of support element 65. Other structures for slid-fitting cover 81 to support element 65 will be apparent to those of skill in the art. Alternatively, cover element 81 may be attached to door 55 by means of screws passing through aligned holes (not shown) in cover 81 and support element 65. 
     Sealing device 50 and cover 81 in some embodiments are made entirely of any suitable plastic material or materials. The particular plastic material for spring elements 70 is selected in consideration of the spring action required of spring elements 70, proper operation of sealing device 50 over a wide temperature range, e.g., about 0° F. to about 180°F., and the ability of spring elements 70 to satisfactorily operate over hundreds of thousands of door openings and closings. That allows sealing device 50 to be attached to the outside of a door in most geographic locations, if desired. The presently preferred material for spring elements 70, as well as for support element 65 and seal actuating element 67 is copolymer polypropylene and polyester. Other suitable materials are polyethylene, polystyrene and polyvinyl chloride. Fiber glass, carbon, aramid or other materials may be added to increase strength and/or performance. Preferably, a flame retardant polymer is used, and device 50 and cover 81 are made from recycled plastics. Support element 65, seal actuating element 67 and spring elements 70 are preferably molded at the same time from the same material as a unitary, homogeneous, integral piece, although support element 65 and seal actuating element 67 may be molded separately, and then spring elements 70 molded thereto, or heat welded thereto, etc. Device 50 and cover 81 may be injection molded, or molded by any suitable process, or die cut from pre-formed plastic sheets. 
     To improve the life and performance of spring elements 70 where they are made of plastic material, the molecular structure of the plastic may be oriented in any suitable manner. While plastic maybe used for all or some of spring elements 70, at least one of the spring element is preferably made of a spring metal and connected as described herein. Seal element 57 may be made of any suitable resilient and preferably flexible material such as elastomers, e.g., neoprene and natural rubber, and foamed plastics. 
     Sealing device 50 may be attached to door 55 by means of screws 86 (FIG. 3) passing through holes 87 in tabs 88 depending from support element 65. Tabs 88 are configured (e.g., extend the full width of sealing device 50) so that sealing device 50 may be attached with either side facing door 55 for left-opening and right-opening doors as described below. Also, holes 87 in tabs 88 are countersunk at both ends (FIG. 5) for the same reason and so that the screws do not protrude from a side of the sealing device, which might otherwise hinder attachment of cover 81. When support element 50 is made of plastic, tabs 88 are preferably formed integrally with support element 50. 
     In order to ensure that the sealing element 57 makes positive contact with saddle 58 (or floor 60), sealing device 50 is installed on door 55 with a predetermined spacing between support element 65 and seal actuating element 67. Support element 65 is positioned relative to saddle 58 such that the seal actuating element 67 urges the seal element 57 into contact with the saddle 58, and the projecting end 73 of seal actuating element 67 is in contact with the cam element 75 at approximately a 90° angle in the closed position of the door. The proper position of sealing device 50 to accomplish the foregoing places spring elements 70 in a stressed condition with door 55 closed, as shown in FIGS. 1, 3 and 6 (broken lines). 
     Referring to FIG. 3, a spacer element 90 attached to support element 65, and stops 91, 92 projecting from seal actuating element 67 are provided to pre-position seal actuating element 67 relative to support element 65 during installation of sealing device 50. Spacer element 90 is attached to support element 65 by a living hinge 93 so that the spacer element 90 may pivot relative to support element 65. In the presently preferred embodiment illustrated in FIG. 56, discussed below, the spacer element 90a is attached to the support element by a living hinge 93a, is positively held in a storage position by a stop 96 and is moved into engagement with the end 91a of a plastic spring element to preparation the seal actuating element. 
     Installation may proceed as follows. First, sealing device 50 is placed against door 55 with the door closed, with projection 73 contacting cam element 75 so as to laterally move seal actuating element 67 into alignment with support element as shown in FIG. 3, and with sealing element 57 in contact with saddle 58. Then, support element 65 is pushed upwardly and spacer element 90 is pivoted into engagement with a stop 91 to separate seal actuating element 67 from support element 65 by almost the length of the spacer element 90. Another stop 92 is provided so that seal actuating element 67 may be spaced a little further from support element 65 when spacer element 90 engages stop 92. This provides some adjustability in fixing the distance of sealing element 67 from support element 65 during installation. Support element 65 may now be attached to door 55 simply by threading screws 86 into door 55 through holes 87 in support element 65 while sealing element 67 simply rests on saddle 58. Alternatively, sealing device 50 may be placed on a flat surface, the support element 65 and the sealing element 67 aligned and spaced so that spacer elements 90 may be pivoted into engagement with a stop 91 or 92. Then, sealing device 50 may then be placed against door 55 with projection 73 in contact with cam element 73, and screwed to door 55. 
     To further facilitate installation of sealing device 50, the holes in door 55 for screws 86 may be pre-drilled using support element 65 as a template. Referring to FIG. 3, with sealing device 50 positioned against door 55 as described above, the locations for screws 86 are marked; then, sealing device 50 is moved away from door 55 and the holes for screws 86 are pre-drilled. 
     FIGS. 11-27 depict another embodiment of a sealing device 50a, another embodiment of a cam element 75a and another embodiment of a cover 81a according to the invention. Sealing device 50a includes a support element 65a which is similar to support element 65, a seal actuating element 67a which is similar to seal actuating element 67 and spring elements 70a which are similar to spring elements 70. Sealing device 50a is constructed and operates generally as described above for sealing device 50, and seal actuating element 67a moves in the directions of the arrows in FIGS. 11 and 12. Among the differences between sealing device 50 and sealing device 50a are the following. The cover 81a is mounted to support element 65a by an interlocking snap fit (FIGS. 17-19) rather than an interlocking slide fit, as described below; cam element 75a (FIGS. 24-27) doubly cams seal actuating element 67a horizontally and vertically, as described below; the seal actuating element 67a of sealing device 50 may be prepositioned relative to the support element 65a by removable spacer elements 90a (FIGS. 20-23), as described below; sealing element 57a is shaped differently from sealing element 57; and sealing device 50a has a somewhat different profile shape than sealing device 50. Also, sealing device 50a seals against the floor 60 rather than a saddle 58, and is used with a door opening not framed by moldings. FIGS. 11, 13 and 14 show the sealing device 50a in the closed position of the door, and FIGS. 12 and 15 show the sealing device 50a in the open position of the door. 
     Referring to FIGS. 17-19, cover 81a is snap-fitted to support element 65a by means of protrusions 100 projecting from the inside of cover 81a and holes 101 in support element 65a. Holes 101 have larger diameter ends 104 and a smaller diameter central portion 105, and protrusions 100 have a larger diameter end 106 and a smaller diameter shaft 107. Ends 106 of protrusions 100 are slightly larger than central portion 105 of holes 101 and are slightly smaller than ends 104 of holes 101. Protrusions 100 are made of a resilient material so that ends 106 may pass through the smaller diameter portions 105 of holes 101 and be snap-fitted thereto. Cover 81a may be removed simply by pulling it back away from support element 65a to overcome the force of the snap-fit. Other structures for snap-fitting cover 81a to support element 65a will be apparent to those of skill in the art. Alternatively, cover element 81a may be attached to door 55 by means of screws passing through aligned holes (as shown in FIGS. 49 and 50) in cover 81a and support element 65a. Sealing device 50a and cover 81a are made of materials as described above for sealing device 50. 
     Sealing device 50a may be installed on a door 55 as follows. In the closed position of door 55, support element 65a is attached to the bottom of door 55 by screws 86. However, support element 65a is positioned relative to floor 60 such that seal actuating element 67a urges seal element 57a into contact with floor 60 and projecting end 73a of seal actuating element 67a is in contact with cam element 75a. The proper position of sealing device 50a to accomplish the foregoing places spring elements 70a in a stressed condition with door 55 closed, as shown in FIGS. 16 (broken lines) and 18. 
     Referring to FIGS. 20-23, spacer elements 90a and holes 112 in support element 65a and seal actuating element 67a are provided to pre-position sealing element 67a and support element 65a during installation of sealing device 50a. First, sealing device 50a is placed against door 55 with the door closed, with projection 73a contacting cam element 75a so as to laterally move seal actuating element 67a into alignment with support element 65a as shown in FIG. 22, and with sealing element 57 in contact with floor 60. (That initial placement of sealing device 50a without spacer elements 90a is not shown.) Then, as shown in FIG. 20, support element 65a is pushed upwardly until hole 101 in support element 65a and seal actuating element 67a are separated by a distance equal to the spacing between prongs 115 of elements 90a, and spacer elements 90a are secured to sealing device 50a by pressing them against support element 65a and seal actuating element 67a so that prongs 115 enter holes 101. Support element 65a may now be attached to door 55 simply by threading screws 86 into door 55 through holes 87a in support element 65a while sealing element 67a simply rests on floor 60. Alternatively, sealing device 50a may be placed on a flat surface, the support element 65a and the sealing element 67a aligned and spaced so that the spacer element 90a may be pressed into holes 112. Sealing device 50 may then be placed against door 55 with projection 73a in contact with cam element 75a, and screwed to door 55. To further facilitate installation of sealing device 50a, the holes in door 55 for screws 86 may be pre-drilled, as described above using support element 65a as a template. After attaching support element 65a to door 55 with screws 86, cam element 75a may be adjusted to finally adjust sealing device 50a. 
     Referring to FIGS. 11-13 and 24-27, cam element 75a includes a two-direction or double-acting camming surface 120 against which projecting end 73a of seal actuating element 67a bears as door 55 opens and closes. The camming surface 120 of cam element 75a is curved in the vertical and horizontal directions (FIGS. 25-27), and the projecting end 73a of seal actuating element 67a is curved in the vertical direction so that when door 55 is opened, the camming surface 120 not only allows seal actuating element 67a to move laterally to the right, but also cooperates with projecting end 73a to doubly cam projecting end 73a upwardly as seal actuating element 67a rises and moves laterally through the action of spring elements 70a. The slopes of the camming surface 120 are selected to provide for movement of the seal actuating element 67a over a predetermined vertical distance for a given lateral movement thereof. That predetermined vertical distance corresponds to the distance from the bottom of seal element 67a and floor 60 in the open position of the door. FIGS. 26 and 27 illustrate the two positions of the seal element 67a in the closed and open positions, respectively, of the door. The camming surface 120 is adjustably mounted to a bracket 124 which is attached to door jamb 77a. 
     Referring to FIGS. 24-27, bracket 124 comprises a channel made up of opposed sides 125, 126 and a central web 127, and a flange 128 extending at a right angle to side 125 of the bracket. Flange 128 has slotted holes 129 in it by means of which bracket 124 is adjustably attached to door jamb 77a by screws 130 (FIG. 25). Attached to the side of camming surface 120 facing the web 127 of bracket 124 are a guide 132 and a threaded shaft 133. The guide 132 is in the form of a bar or strip which extends from camming surface 120 through a slot 134 in web 127 having the same shape as guide 132 but slightly larger so as to permit sliding movement of guide 132 in slot 134. Threaded shaft 133 extends from camming surface 120 through a hole 135 in web 127. Threaded onto shaft 133 is an internally threaded nut 136 also having on the exterior thereof a worm gear. Rotation of nut 136 on shaft 133 causes shaft 133 to move camming surface 120 relative to bracket 124. A thumbscrew 137 having a knurled knob 138 at one end projecting from side 126 of bracket 124 and a worm gear 139 thereon within bracket 124 is rotatably supported near knob 138 in a hole 140 in side 126 of bracket 124 and at a free end thereof in a hole 141 in a support bracket 142 attached to web 127. The worm gear 139 carried by thumbscrew 137 is in mesh with the nut 136 so that rotation of thumbscrew 137 rotates nut 136. Camming surface 120 is advanced out of bracket 124 and retracted into bracket 124 by rotating thumbscrew 137. After sealing device 50a has been mounted to door 55, the location of camming surface 120 is adjusted for the desired movement of seal actuating element 67a. Further adjustments may be made during use to compensate for wear, creep, etc., as discussed above. IN the presently preferred embodiment depicted in FIG. 53, the projecting end 73I is embodied by the head 300 of a screw 301. The degree to which the screw head 300 projects is adjustably be rotating screw 301, which thereby adjusts the desired movement of seal actuating element 67i. 
     Sealing devices 50 and 50a may be provided in a number of sizes to fit standard doors. Alternatively, or additionally, sealing devices 50 and 50a may be provided in one or a limited number of sizes to fit a number of door sizes. Referring to FIG. 2, sealing device 50 at the end thereof opposite to projecting end 73 has a number of pre-weakened portions 140 extending through support element 65, seal actuating element 67 and at least one spring element 70. Similarly, referring to FIG. 12, sealing device 50a at the end thereof opposite to projecting end 73a has a number of pre-weakened portions 140 extending through support element 65a, seal actuating element 67a and at least one spring element 70a. The following description for adjusting the length of sealing device 50a applies as well to sealing device 50. 
     Referring to FIGS. 28-30, sealing device 50a may be cut or snapped along a pre-weakened portion 140 to adjust the length of sealing device 50a for the particular door to which it is to be attached. Pre-weakened portions 140 are not provided on the end of sealing device 50a with projecting end 73a since projecting end 73a must be retained to contact the cam element 75a. Pre-weakened portions 140 are simply reduced thickness portions extending along lines, but may be pre-weakened along lines in other ways, e.g., by heat, material composition, etc. The pre-weakened lines are situated on the door side of sealing device 50a so as not to be visible when sealing device 50a is mounted to a door. After the desired length of sealing device 50a has been determined, one cuts along a weakened line portion 140 using, for example, a utility tool, and/or simply snaps along a pre-weakening line portion 140 to sever the unwanted end of sealing device 50a. Thus, no special tools like a hack saw are required to shorten sealing device 50a. Before cutting along a pre-weakened line portion 140, the ends of support element 65a and seal actuating element 67a are aligned (FIG. 28) by moving the seal actuating element 67a laterally. After severing the end of sealing device 50a and releasing seal actuating element 67a, seal actuating element 67a will move laterally to the left (FIG. 30) offset from support element 65a. Cover element 81a has similar weakened portions 140 on the inside thereof which are cut and/or snapped in a similar manner. 
     The same sealing devices 50 and 50a and cover elements 81 and 81a, respectively, may be used for a left-opening door and a right opening door simply by reversing sealing devices 50 or 50a end-to-end and positioning cam elements 75 or 75a on the hinge side of the door jamb. Covers 81 and 81a are not end-to-end reversed for right and left opening doors, and include weakened portions 140 on the inside thereof at both ends. The weakened portions 140 at the right end of cover 81 and 81a are cut or snapped for a left opening door, and the weakened portions 140 at the left end of 81 and 81a cover are cut or snapped for a right opening door. With respect to mounting cover 81 to sealing device 50 for installation of sealing device 50 on a left-opening or a right-opening door, support element 65 has dove tail recesses 82 on both sides thereof for receiving the dove tail projection 83 on cover 81. Thus, reversing sealing device 50 for left-opening or right-opening doors presents no problems when sealing device 50 is shortened. With respect to sealing device 50a and cover 81a, the locations of the holes 101 in support element 65a and the protrusions 100 in cover 81a are symmetrically located relative to the centers of support element 65a and cover 81a so that regardless of which end of cover 81a is cut, the holes 101 and protrusions 100 will be aligned. 
     The invention therefore provides sealing devices 50 and 50a and covers 81, 81a which may be used on left or right opening doors of various sizes. The drawings illustrate attachment of sealing devices 50, 50a to the inside of a door. However, a sealing device 50, 50a may also be attached to the outside of a door. In that case, the cam element is moved to project from the outside of the door jamb on the hinge side of the door. Alternatively, the cam element may be positioned on the side of the door jamb opposite the hinges for embodiments in which the sealing device is attached to the inside and the outside of the door. 
     As mentioned above, a sealing device 50, 50a may be installed on a door which closes an opening that is framed with moldings, or which does not have moldings. However, installation of cam element 75a with an opening framed with moldings may require that part of the molding be cut away. 
     An in-the-door mounted or mortise-mounted sealing device 50b is illustrated in FIGS. 33-37. Sealing device 50b is mounted in a channel 143 by means of screws (not shown) passing through holes 144 on one side of channel 143, holes (not shown) in support element 65b and threaded holes (not shown) in the other side of channel 143. Door 55b has a slot 145 in the bottom thereof in which is mounted channel 143. Sealing device 50b is first mounted in channel 143, then channel 143 is mounted in door slot 145. Channel 143 has out-turned edges 146, and the bottom edge of door 55b has recesses 147 to receive channel edges 146 therein (FIGS. 35-37). Channel edges 146 have holes 148 therein through which screws 149 are passed to secure channel 143 (with sealing device 50b therein) within slot 145 of door 55b. Sealing device 50b is mounted within channel 143 so that seal actuating element 67b may move freely therein, as generally described above with respect to seal actuating element 67, cover 80 and door 55. Cam element 75b (FIGS. 33-34) is mounted to the inside edge of door jamb 77. Holes in channel 143 and sealing device 50b and the depth of channel 143 are pre-selected, so that when channel 143 is mounted in slot 145 of door 55b, sealing element 57b will contact saddle 58 with the desired force in the closed position of door 55b, and sealing element 57b will be above and out of contact saddle 58 and with floor 60 in the opened positions of the door as described for sealing device 50. Mortise-mounted sealing device 50b has application not only to OEM, but also to after market where handy or skilled persons can install it in an existing door installation. 
     FIGS. 38 and 39 illustrate an embodiment of a sealing device which can accommodate a larger variation in the surface of a floor below the door to which the device is mounted. Sealing device 50c includes a seal actuating element 67c comprised of a plurality of articulated sections 150, 151 and 152 which may bend or pivot relative to each other at the joints 155 of the sections. Sealing device 50c may seal against a generally flat floor surface or an uneven floor surface as shown in FIG. 39. The joints 155 linking sections 150 and 151 and sections 151 and 152 each comprise two links 160, 161 connected at opposite ends to adjacent sections 150, 151, and 151, 152. Links 160 and 161 are flexible and/or their connection to sections 150, 151 and 152 are flexible so that adjacent sections 150, 151 and 151, 152 may bend or pivot relative to each other as shown in FIG. 39. Links 160 and 161 are connected generally spaced apart to one section and connected either close together (not shown) or at a vertex 162 to the adjacent section to promote bending where the links are connected close to each other or at the vertex 162. At least one spring element 70c connects each section 150, 151, 152 to support element 65c. The lengths of sections 150, 151 and 152 may be different, and longer sections (not shown) may be connected by two or more spring elements 70c to support element 65b. While a sealing device 50c with three sections 150, 151, 152 is illustrated, a sealing device may have only two, or more than three such sections. Sealing device 50c illustrated in FIGS. 38 and 39 includes open areas or holes 163 which reduce the material content of sealing device 50c without effectively weakening it, thereby reducing costs. 
     In the embodiment depicted in FIGS. 1, 2, 11, 12 and 28-30, the length of sealing devices 50, 50a may be reduced without the use of special tools to fit a range of door sizes. In the embodiment of sealing device 50d depicted in FIGS. 40 and 41, the length of sealing device 50d may be extended to fit wide doors such as garage doors or doors in industrial facilities. Sealing device 50d (FIGS. 40-41 ) is of modular design and comprises a base sealing device 170 having a projecting end (not shown) similar or identical to projecting end 73, 73a of sealing devices 50 and 50a and one or more extension sections 171. The right ends of support element 65d and seal actuating element 67d of base sealing device 170, and both ends of support element 65d and seal actuating element 67d of extension section 171 include hollow ends 175, 176 of a given cross-sectional configuration. The cross-sectional configurations of the ends 175 of support elements 65d are the same, and the cross-sectional configurations of the ends 176 of sealing actuating element 67d are the same. A shaped peg 178 is inserted into the hollow ends 175 of support elements 65d of base sealing 170 and extension section 171, and a shaped peg 179 is inserted into the hollow ends 176 of seal actuating element 67d of base sealing device 170 and extension section 171 to join the base sealing device and the extension section 170, 171 together as shown in FIG. 41. The cross-sectional configuration of shaped pegs 178 and of hollow ends 175 are similar, and the cross-sectional configurations of shaped pegs 179 and of hollow ends 176 are similar. Shaped pegs 178, 179 and the hollow ends 175, 176 may have configurations other than those depicted in the drawings. A cover may be provided for each base sealing device or extension section which abut when they are attached to the sealing device and extension section as described above. 
     In the extension embodiment illustrated in FIGS. 40 and 41, shaped pegs 179 are provided which are inserted into both the base sealing device 170 and the extension section 171. In other embodiments, the shaped pegs may be fixed to the ends of the extension section 171 or the ends themselves of the extension section 171 may be shaped to telescope into the hollow ends of the base sealing device 170. In still another embodiment, the base sealing device 170 and the extension section 171 may be made identical, and both provided with a projecting end which is shaped so as to fit into the hollow end of the seal actuating element of an adjacent sealing device and which functions as a projecting end to be cammed by a cam element. In that embodiment, a first base sealing device may be mounted with the shaped projecting end on the seal actuating element in contact with the cam element and a second base sealing device attached as an extension section with the shaped projecting end on the sealing actuating element inserted into the hollow end of the seal actuating element of the first base sealing device. A shaped peg may be inserted into the hollow ends of the support elements of the first and second base sealing devices to connect them. 
     FIGS. 42-46 illustrate an embodiment of a sealing device 50e in which spring elements 70e are manufactured independently of, and not integrally connected to, support element 65e and seal actuating element 67e. Referring to FIG. 42, each spring element 70e is a strip having at its opposite ends structure which mates and engages with structure on support element 65e and seal actuating element 67e so as to support seal actuating element 67e from support element 65e as described above for sealing device 50. Each spring element 70e has shaped ends 180, 181, and support element 65e and seal actuating element 67e have correspondingly shaped slots or holes 184, 185 which receive shaped ends 180, 181, respectively. As shown in FIG. 42, ends 180, 181 of spring elements 70e are generally of rectangular cross-section, and extend at an angle to the central part of the spring elements 70e. Correspondingly, slots 184, 185 include a short section 186 extending at an angle to the respective support and seal actuating elements 65e, 67e, and a section 187 extending parallel to the longitudinal extent of the respective support and seal actuating element 65e, 67e. When support element 65e is mounted to a door 55, upper ends 180 of spring elements 70e are engaged in slots 184 of support element 65e and lower spring element ends 181 are engaged in slots 185. The configurations of shaped ends 180, 181 and shaped slots 184, 185 are such that spring elements 70e engage and are interlocked to support element 65e and seal actuating element 67e so as not to be displaced laterally when a lateral force is applied to seal actuating element 67e. Thus, the engaged and interlocked spring elements 70e impede free lateral movement of seal actuating element 67e relative to support element 65e, i.e., allow lateral movement of seal actuating element 67e only against the spring action of spring elements 70e, as described above for sealing device 50. FIG. 45 illustrates flexing of spring elements 70e of sealing device 50e mounted to a door 55 when a lateral force is applied to seal actuating element 67e by a cam element (not shown) as door 55 is closed. Spring elements 70e, support element 65e and seal actuating element 67e may be assembled as a unit on a flat surface, and then mounted as an assembly to door 55. Sealing device 50e may be used with left or right opening doors, as illustrated by FIGS. 44 and 46, as described above for sealing devices 50 and 50a. The particular shapes for ends 180, 181 of spring elements 70e and slots 184, 185 are not critical, and shapes other than those shown may achieve the interlocking and engaging functions described above. 
     The embodiments of sealing devices 50f and 50g illustrated in FIGS. 47 and 48 include spring element parts integrally attached to either or both of support element 65f, g or seal actuating element 67f, g, and interlocked as described below. Referring to FIG. 47, spring element 70f includes two parts 190, 191, part 191 of which is integrally attached to support element 65f and part 190 of which is attached to seal actuating element 67f. Providing spring element parts 191, 190 integral respectively with support element 65f and seal actuating element 67f enables sealing device 50f to be made in two parts. Spring element parts 190 and 191 each terminate in an end 192, 193, respectively, shaped to engage and interlock each other as shown in FIG. 47. Each shaped end 192, 193 is flared outwardly and includes a sharp angled portion 194 at which parts 190, 191 engage. Parts 190, 191 also include a curved portion 195 in contact with another edge 196 of shaped ends 192, 193. The pans 190, 191 of spring element 70f  project at an angle from support element 65f and seal actuating element 67f. The configuration described above for spring elements 70f enables parts 190 and 191 to engage and interlock so as to support seal actuating element 67f from support element 65f, and provide the spring action described above for spring elements 70 of sealing device 50. 
     Referring to FIG. 47, each of support element 65f and seal actuating element 67f includes camming surfaces 200, 201, respectively, which function to assist spring elements 70f in providing movement of seal actuating element 67f towards and away from support element 65f in response to lateral movement of seal actuating element 67f by a cam element 75 (not shown in FIG. 47) against projecting end 73f of seal actuating element 67f. As seal actuating element 67f is urged to the right in FIG. 47, camming surface 200 forces camming surface 201 to ride along surface 201, which forces seal actuating element 67f downwardly. Referring to FIG. 48, sealing device 50g includes spring elements 70g integrally connected to seal actuating element 67g and projecting therefrom at an angle, and engaging structure 205 integrally connected to support element 65g (or the reverse). Spring elements 70g each include a shaped end 207 which is engaged in correspondingly shaped engaging structure 205 in support element 65g. Shaped ends 207 and engaging structure 205 engage and interlock as shown in FIG. 48 so as to support seal actuating element 67g from support element 65g, and provide the spring action described above for spring elements 70 of sealing device 50. Support element 65g and seal actuating element 67g also include camming surfaces 200, 201. Sealing device 50g operates generally as described for sealing device 50f. Engaging structure 205 may be flexible and so form a part of a respective spring element, or may be relatively rigid so that spring element 70g alone constitutes the spring element. 
     FIGS. 49 and 50 illustrate an embodiment of a sealing device which does not utilize a cam element and a projecting end to couple the seal actuating element to the door jamb. Instead, sealing device 50h shown in FIGS. 49 and 50 includes coupling means 210 comprising a flexible coupling member 211 in the form of a filament, cord, cable or wire attached at one end to door jamb 77 at 213 and at the other end to a hole 215 in a projection 216 on top of seal actuating element 67h. Sealing device 50h also includes V-shaped spring elements 70h which are configured to resiliently support seal actuating element 67h from support element 65h for movement of seal actuating element 67h towards and away from support element 65h while introducing substantially no lateral movement of seal actuating element 67h with respect to support element 65h. Spring elements 70h comprise a portion 220 extending at an angle from support element 65h and a portion 221 extending at substantially the same angle from seal actuating element 67h, with the portions 220, 221 meeting at a vertex to form a V-shaped spring element. Spring element portions 220, 221 extend from support element 65h and seal actuating element 67h and are joined at their free ends such that seal actuating element 67h may move towards and away from support element 65h while the spring element portions 220, 221 substantially prevent lateral movement of seal actuating element 67h. 
     In operation, with door 55 closed (FIG. 49), seal actuating element 67h urges sealing element 57 into contact with floor 60 with a slight slack in cord 211. As door 55 is opened, the slack in cord 211 is quickly taken up and continued opening of door 55 lifts seal actuating element 67h and tensions spring elements 70h, as shown in FIG. 50. When door 55 is closed to the point that there is some slack in cord 211, spring elements 70h relax and force seal actuating element 67h downwardly to take up the slack until door 55 is fully closed, as shown in FIG. 49. 
     Sealing device 50h is mounted to the interior of a door 55 as generally described for sealing device 50 and provides the desired spring tension in the closed position of door 55 illustrated in FIG. 49. Then cord 211 is attached to hole 215 and to door jamb 77 at 213 with a slight slack in the cord. Since sealing device 50h does not require a cam element, it may be mounted to left-or right-opening doors, and to the inside and the outside of doors without having to consider placement of a cam element. 
     Spring elements 70h may be separate pieces connected to support element 65h and seal actuating element 67h as described above. Or spring elements 70h may each have a strip 220, 221 integrally attached to support element 65h and seal actuating element 67h, respectively, and coupled together. 
     Sealing device 50h may have pre-weakened portions (not shown) at one end thereof so that sealing device 50h may be reduced in size as described above for smaller openings. When pre-weakened portions are provided at one end of device 50h, the V-shaped spring elements 70h are not symmetrically located about the center of sealing device 50h which is then longer on the end with the pre-weakened portions. This allows a substantial length of sealing device 50h to be severed without severing a spring element 70h. If a smaller adjustment range is acceptable, then sealing device 50h may have pre-weakened portions at both ends with the V-shaped springs being symmetrically positioned. Sealing device 50h may then be shortened at either or both ends. The spring elements 70h of sealing device 50h are unstressed in the closed position of door 55, and sealing device 50h is molded with the springs extended and unstressed (&#34;molded long&#34;). Sealing device 50h in the closed position of the door is attached with only a slight stress on spring elements 70h sufficient to force sealing element 57 into positive contact with the floor. Spring elements 70h are effectively stressed only when the door is open, which accounts for relatively short periods of time in comparison to the time the door is closed. As mentioned above, the embodiment of sealing device 50h has an advantage over the embodiment of FIG. 1 in which the spring elements are stressed in the closed position of the door in that a sealing device such as device 50h in which the spring elements are usually unstressed will have a longer service life than a device such as device 50 in which the spring elements are usually stressed. 
     Sealing devices 50c-h each have a cover element (not shown) identical or similar to cover 81 or 81a of sealing device 50 or 50a, which may be mounted to sealing device 50c-g, as described for sealing devices 50 and 50a. Cover 81h for sealing device 50h (FIGS. 49 and 50) is mounted to door 55 by the same screws 86 which attach support element 65h to door 55. Also, sealing devices 50c-g may be mounted as respective assemblies using spacer elements 90 or 90a as described for sealing devices 50 and 50a. Sealing devices 50c-h may be used with left or right opening doors and may have weakened portions (not shown) for adjusting the length of sealing device 50c-h as described above for sealing device 50a. 
     Sealing devices 50c-h may be made of materials as described for sealing device 50. 
     The presently preferred embodiment is illustrated in FIGS. 51-64. Referring to FIG. 51, the sealing device 50i is mounted to the outside of a door 55 with the projecting end 73i (head 300 of screw 301) adjacent the hinge end of the door and the bearing element or strike plate 75i mounted on the door jamb 77. The sealing device 50i (FIG. 53) comprises a supporting element 65i and a seal actuating element 67i. In this embodiment, the door jamb does not have an exterior molding and the bearing plate 75i does not include a camming surface which extends beyond the edge of the door jamb. However, the sealing device 50i causes the sealing actuating element to move between its retracted and projecting (sealing) position quite abruptly because the sealing device is located on the side of the door facing away from the direction in which the door swings. Thus, a camming surface or surfaces are not needed, and the bearing plate 75i may be used with most moldings. 
     A cover 81i (FIGS. 51 and 52) is slid-fitted onto the sealing device 50i. The cover 81i (FIGS. 52 and 54) has a top flange 84i which includes a dovetail-like recess 82i that receives a dovetail-like projection 83i in the top of the supporting element 65i to slide-fit the cover to the supporting element. End caps 305 (FIG. 51 ) and 306 (FIG. 64) are snap-fitted to the supporting element 65i and cover 81i to close off the otherwise open ends of the cover. 
     Referring to FIG. 53, the sealing device 50i comprises a plurality of spring elements 70i and at least one spring element 310 (FIG. 53). In this embodiment, the spring elements 70i are integral with the support element 65i and the seal actuating element 67i to provide a pre-configured one-piece unit in which the seal actuating element 67i is suspended from the supporting element 65i in the desired relationship, while the spring elements (leaf springs) 310 are separately installed into the sealing device and primarily provide the spring action described above which causes the seal actuating element to move between its retracted non-sealing position and its projecting sealing position. In accordance with this embodiment of the invention, the pre-configured one-piece unit is inexpensive to manufacture and need not be constructed of materials selected for spring characteristics, and the sealing device has excellent performance over temperature, use cycles and time, and yet is easy to assemble and install. Also, a one-piece unit tends to provide more equal sealing pressure of sealing element against a saddle or floor along the entire length thereof. 
     Spring elements 70i are integrally molded from plastic material in one piece with the supporting element 65i and the seal actuating element 67i, as generally described above with respect to sealing device 50. Thus, spring elements 70i permit the support element 65i and the seal actuating element 67i to be supplied as a single piece, which eliminates the need for the user to assemble them. Such assembly would become particularly difficult and burdensome where an additional leaf spring 310, discussed below, is assembled into the sealing device. 
     At least one leaf spring 310 (FIG. 53) is attached to the one-piece molded part (supporting element 65i, spring elements 70i and seal actuating element 67i) after (or during) molding thereof. The leaf spring 310 is made of a material selected primarily for its spring characteristics to provide the required spring action described above over a wide temperature range and over hundreds of thousands of door opening and closing cycles. Making the leaf springs 310 of a different material from the plastic used for the support element 65i, the spring elements 70i and the seal actuating element 67i, allows the selection of optimal spring characteristics without requiring the entire sealing device to be made of the same, typically expensive material. In the preferred embodiment, leaf springs 310 are made of spring steel (but maybe made of another suitable material or materials), and the remainder of the sealing device is made from plastic, which may be a plastic described herein or almost any less expensive plastic even one which exhibits some creep or which would lose its spring characteristic in a relatively short time. As indicated above, spring elements 70i are provided to hold the support element 65i and the seal actuating element 67i together as a unit, but secondarily may also provide some of the spring action required to operate the sealing device. However, depending on door width and particularly where two or more leaf springs 310 are employed, little, if any, spring action is required from the spring elements 70i. 
     The sealing device 50i operates generally as described for sealing device 50 (but more abruptly), and the movement of seal actuating element 67i between the projecting sealing position of FIG. 59 and the retracted non-sealing position of FIG. 58 occurs automatically in response to the opening and closing of door 55 due to interaction between the projecting end 73i of seal actuating element 67i and the bearing plate 75i. Bearing plate 75i moves the seal actuating element 67i laterally, and leaf springs 310 (and spring elements 70i to a lesser extent) in cooperation with projecting end 73i and bearing plate 75i move seal actuating element 67i vertically up and down as door 55 is opened and closed. Referring to FIGS. 58 and 59, sealing device 50i is mounted to door 55 as described for sealing device 50 (except on the outside of the door), i.e., such that (a) in the closed position of the door, seal actuating element 67i urges sealing element 57i against the saddle 58 with sufficient force to effect a positive seal of sealing element 57i against the saddle 58 with the projecting end 73i of seal actuating element 67i bearing against the bearing plate 75i; and (b) in the opened position of door 55 (FIG. 58), sealing element 57i is spaced above and not in contact with the saddle 58 (and the interior floor). 
     After the sealing device 50i is properly mounted to the door 55, the optimum sealing contact of the sealing element 57i with the saddle may be obtained by adjusting the extent to which the seal actuating element 65i projects. While in other embodiments the camming element was adjusted, if necessary, to complete the installation of the sealing device, in the embodiment of FIG. 50, the degree to which projecting end 73i extends towards the bearing plate 75i is adjustable by adjusting screw 301, which is threadedly received in a bushing 312 (FIGS. 58 and 59) integrally molded with the seal actuating element 67i. Adjusting screw 301 moves the seal actuating element over a range of up to about one inch, which ensures that the sealing element 57i is the proper sealing contact with the saddle 58. A stop 313 integrally molded with the seal actuating element 67i spaced a short distance from bushing 312 engages the end of screw 301 and limits its inward travel. 
     The leaf springs 310 are attached to the sealing device as follows. Some of the leaf springs 310 (FIGS. 53 and 56) are attached to the supporting element 65i at the upper end of a depending projection 320 to which a spacer element 90i is also pivotally connected at the lower end of an opposite side thereof. The projections 320 depend sufficiently so that a spacer element 90i pivotally connected at a lower end thereof by a living hinge portion may be retained pivoted upwardly in the storage position shown in FIGS. 52 and 53 (broken line position in FIG. 56) by a nub 322 also depending from the support element 65i. The function of spacer elements 90i is the same as that of spacer elements 90, i.e., to properly space the seal actuating element 67i from the support element 65i during mounting of the sealing device 50i to the door, as described above for sealing device 50. The stop on the seal actuating element 67i which engages the spacer element 90i in its lower pivoted position (full line position in FIG. 56) may be the lower squared end 91i of a spring element 70i or a separate stop 91, depending upon the location of the spacer element. The projections 320 each have recesses 323 to reduce material content and a hole 87i therein which is used to mount the support element to the door by screws 86 (FIG. 54). Since spacer elements 90i are not needed at every location at which a leaf spring 310 is provided, some leaf springs 310 (FIG. 53) are attached to the support element 65i by a nub 322, each also having a hole 87i for receiving a screw 86 (FIG. 54) to mount the support element 65i to the door. 
     The screw holes 87i (FIG. 54) in sealing device 50i are not countersunk as in sealing device 50. This allows the sealing device to be made as thin as possible and still allow a sufficient thickness of the support element 65i against which the screws 86 may bear. To accommodate the unrecessed screw heads of filleted screws 86 in this embodiment, the cover 81i has an outwardly projecting rib 326 (FIG. 54) which extends longitudinally along the cover 81i (FIG. 51). The cover 81i has a second outwardly projecting rib 327 (FIGS. 51 and 54) spaced below the rib 326 by a flat or straight portion 328 closely adjacent the lower part of the projections 320 of support element 65i and also closely adjacent the lower part of the support element 65i (FIG. 54). Another flat or straight portion 330 (FIG. 54) is provided above rib 326 closely adjacent a flange 331 projecting from support element 65i. The lower end 329 of the cover 81i below rib 327 is also flat and is closely adjacent the seal actuating element 67I in both its retracted and projecting positions (FIGS. 54 and 55). The combination of ribs 326 and 327, and the flat portions 328, 329 and 330 increases the impact resistance of the cover to, for example, kicking. Thus, the cover 81i and sealing device 50i may function quite well as a kick plate. The spaced projections 320 thus serve still another function, and that is to provide impact support to cover 81i adjacent the flat portion 328. 
     Referring to FIGS. 54 and 55, the cover 81i has an inwardly projecting ridge 335 which extends longitudinally along the inside of the cover making sliding contact with the seal actuating element 67i. The upper edge 337 of the seal actuating element 67i has a beveled surface which facilitates sliding of the seal actuating element therealong, and the ridge 335 has an oppositely beveled surface which engage and form a seal in the projecting sealing position of the seal actuating element 67i (FIG. 55) to prevent air from flowing under the door, through the spaces in the sealing device and then between the sealing device and the cover to the interior side of the door. 
     The leaf springs 310 are attached to the sealing device 50i as follows. Referring to FIG. 57, each leaf spring 310 is a rod (or bar) of spring steel having a central straight portion 340 and opposed hooked ends 341 and 342. End 341 is U-shaped having a first straight portion 345 extending from the central portion 340, a curved central portion 346 extending from the first portion and a second straight portion 347 extending from the curved central portion 346. The straight portions 345 and 347 are parallel to each other, and the curved central portion bends over an angle of about 180°, to form an open-on-one-side loop. End 342 includes a curved portion 350 extending from the central portion 340 and a small straight portion 351 extending from the curved portion 350. The curved portion 350 bends over an angle of about 180°. The angle selected for the straight portion 345 of end 341 depends upon the angle at which spring element 310 extends between the support element 65i and the seal actuating element 67i. An angle of approximately 8° for the leaf spring 310 relative to the top of the seal actuating element 67i in the retracted position thereof (FIG. 58) has been found to be suitable for a travel of about 0.75 inch of the seal actuating element. This angle is not critical. 
     The hooked end 341 and its retainer 360, 361 (FIG. 57) are configured to prevent the end 341 from rotating in retainer 360, 361. Retainer portion 360 is integrally formed in the bottom of the support element 65i, and retainer portion 361 is a cap which is snap fitted onto retainer portion 360 after the spring end 341 is inserted into the retainer portion 360 to prevent the spring end 341 from popping out of retainer portion 360. Retainer cap 361 also reinforces retainer portion 360. Retainer portion 360 has a central circular post 366 and a recess 367 that has a circular portion surrounding the post 366 and straight portions on opposite sides of the post. The end 341 of the spring fits into the recess 367 with the inside of the central circular portion 346 of the spring end engaging the post 366 and the outside of the spring end straight portions 345 and 347 engaging plastic material 348, 349 surrounding the straight portions of the recess. The retainer portion 360 has rectangular recesses 370 on opposite sides of the post 366 and holes 371 on opposite sides of the post 366 beyond the recesses 370. The retainer portion 360 thereby engages the spring end 341 and prevents it from rotating. Retainer cap 361 is a generally rectangular plate having a flat surface 372 which faces retainer portion 360, has a central hole 374 therein and on opposite sides of the hole 374 has rectangular projections 375 and cylindrical posts 376 extending therefrom. The retainer cap 361 is snap fitted to the retainer portion 360, with the respective posts and projections received in the respective holes and recesses so that the spring end 341 is tightly held in the retainer 360, 361, prevented from rotating therein and from popping out of retainer portion 360. The rectangular projections 375 reinforce the plastic material 379 between the recesses 370 and 367 to maintain the spring end 341 tight in retainer 360, 361. 
     Another retainer 380, 381 (FIG. 57) rotatably holds the other end 342 of the spring element 70i therein. Retainer portion 380 is integrally formed in the top of the seal actuating element 67i, and retainer portion 381 is a cap which is snap fitted onto retainer portion 380 after the spring end 342 is inserted into the retainer portion 380. Retainer portion 380 has a circular post 386 and a recess 387 that has a circular portion surrounding part of the post 386. Plastic material 388 surrounds recess 387. The end 342 of the spring fits into the recess 387 with the inside of the central circular portion 350 of the spring end wrapped partially around but not fully engaging the post 386. The spring end 351 engages the post 386 and the plastic material 388 surround recess 387. The retainer portion 380 has a hole 391 on one side of the post 386. Retainer cap 381 is a plate having a flat surface 392 which faces retainer portion 380, has a hole 384 therein opposite post 386, and a cylindrical post 396 opposite hole 391. The retainer cap is snap fitted to the retainer portion 380 to prevent the spring end 342 from popping out of retainer portion 380. The respective posts of the retainer portions 380, 381 are received in the respective holes so that the spring end 342 is tightly but rotatably held in the retainer 380, 381. The configuration of the spring end 342 and the recess 387 will allow the spring to rotate about the post 386 when the seal actuating element is cammed to move it to its sealing position, and to rotate back as the seal actuating element returns to its retracted position. The leaf spring element 310 is thus mounted to the sealing device in cantilever fashion where one end is fixed and the other may move. 
     Although use of the retainer cap 361 is preferred, the post 366 and recess 367 of retainer portion 360 and the post 380 and recess 387 face the door 55, so that if the retainer caps are eliminated, the door surface can prevent the spring from popping out of the retainer portions 360, 380. 
     Referring to FIG. 55, the sealing element 57i is similar to sealing element 57 but includes several hollow chambers 400-402 as opposed to a single hollow chamber and has a curved (concave upwardly) bottom portion 404 which forms opposed side portions 405 and 406. Since the sealing element 57i is made of flexible material (e.g. EPDM) as described herein, the center of the curved portion 404 and the two side portions 405 and 406 may contact the floor surface 60 when the sealing element 57i is urged against the floor 60 by the spring elements. This provides an improved seal between the sealing element 57i and the floor 60, even where the floor is slightly uneven. The sealing element 57i has barbs 407 (FIG. 55) and the seal actuating element 67i has a channel 79i with grooves 408 therein which engage the barbs 407. The sealing element 57i is inserted into the seal actuating element 67i by pushing the sealing element top into the channel 79i. This is easier than sliding the sealing element into the channel because the long sealing element would generate high frictional resistance along the channel. The barbs 407 and grooves 408 resist separation of the sealing element 57i from the channel 79i. 
     The end caps 305 (FIGS. 60-63) and 306 (FIGS. 64-67), and the sealing device 50i have cooperating structure for snap-fitting the end caps to the sealing device. Referring to FIGS. 60-63, the end cap 305 has a base 409 configured to close off the otherwise open top end of the sealing device at the projecting end 73i thereof. A pair of spaced apart parallel arms 410, 411 project from the inside surface of base 409 adjacent the top thereof, each having a ridge or tooth 412 inwardly projecting toward the opposite arm. The lower part of the support element 65i has a web 415 having a plurality of serrations 417. The arms 410, 411 are spaced apart to be received on opposite sides of support element web 415, and the arms 410, 411 are flexible, and teeth 412 and serrations 417 are shaped to allow serrations 412 on the arms to slide over the teeth 417 on the web in one direction as the cap 305 is pushed onto the end of the support element 67i, and engage in the opposite direction to tightly retain the cap 305 on the support element 67i, as shown in FIG. 65 for arms 430, 431 of end cap 306. Two spaced apart parallel arms 420 and 421 extend from the inside surface of the base 409 adjacent the bottom thereof. These arms do not have teeth and are spaced apart so as to flexibly engage opposite sides of the cover 81i when the cap is snap-fitted to the sealing device 50i. A third arm 422 parallel to arms 420, 421 also projects from the inside surface of base 409 adjacent the bottom thereof and is provided for alignment purposes, i.e., it contacts the door to help align the cap 305 with the sealing device. 
     Referring to FIGS. 64-67, end cap 306 has a base 429 configured to close off the otherwise open end of the sealing device at the end 425 of the sealing device opposite the projecting end 73i. A pair of spaced apart parallel arms 430, 431 project from the inside surface of base 429 adjacent the top thereof, each having a ridge or tooth 432 inwardly projecting toward the opposite arm. A plurality of serrations 437 are provided in the web 415 at this opposite end 425 of the sealing device. The arms 430, 431 and the teeth and serrations 432, 437 function as described above for end cap 305 to secure the end cap 306 to the support element 65i. Three spaced apart parallel arms 440-442 extend from the inside surface of the base 419 adjacent the bottom thereof. These arms are configured and function as described for arms 420-422 of cap 305. The serrations 437 extend for an appreciable distance along web 415 of support element 65i at the end 425 of the sealing device so that some serrations will remain if a portion of the end 425 is severed as discussed above (see FIGS. 28-30) to shorten the length of the sealing device to fit a particular door length. 
     The end caps 305 and 306 are attached to the sealing device 50i and cover 81i without fasteners so that no holes need to be made in the parts, which would be difficult to mold, and so that no fasteners for the caps need to be handled by the consumer. The ribs 326, 327, and the flat portions 328-330 and the top 84i of the cover not only perform the functions described above, i.e., impact resistance and closing off the top of the sealing device, but provide a very esthetically pleasing cover. The end caps similarly enhance the esthetic appeal of the device and perform the function of closing off the ends of the sealing device. The cover and end caps perform these functions, are esthetically pleasing and in addition are assembled easily without fasteners. The spacer links 90i facilitate installation of the sealing device to the door using only a few screws. Everything else is attached without screws. 
     As illustrated in FIG. 68, a sealing device 50i and a modified sealing device 50i (on the right) may be attached together to provide an expanded length sealing device. (The modified sealing device 50i does not include a projecting portion 73i.) Instead of using the pegs 178, 179 and recesses 175, 176 shown in FIG. 40, strips 440 may be inserted into channels 415, 443 of adjacent support elements and seal actuating elements, respectively, to bridge them. Holes may be provided in the strips and channels to receives screws 445 to attach the strips in the channels. Clamps or snap-fitting structures may be used to eliminate the need for fasteners. 
     The sealing device 50i maybe attached to right or left opening doors by reversing it. The cover 81i is not reversed and is slid on the sealing device in the same way for right and left opening doors. 
     As mentioned above, the support element 65i, the seal actuating element 67i and the spring elements 70i may be made from an inexpensive plastic, e.g., a thermoplastic olefin. The cover 81i is preferably made from rigid PVC (RPVC) plastic, and has a co-extruded Durocap outside layer (e.g., 5% by weight) to increase its impact resistance. The end caps 305, 306 are preferably made from RPVC. The retainer caps 361 and 381 used to secure the spring elements 310 to the sealing device are preferably made from RPVC, which is harder than the particular thermoplastic olefin used for support element 65i, to reinforce portions 379 (FIG. 57) and prevent them from moving or flexing under the action of spring element 310. This is preferred over making the support element 65i, the seal actuating element 67i and the spring elements 70i of a harder, typically more expensive plastic. The sealing element 67i is preferably made from EPDM. The bearing plate 75i is preferably made from stainless steel to resist corrosion since it may be exposed to the weather whenever the door is opened. 
     The sealing device 50i may be provided to a consumer fully assembled, or the leaf springs 310 may be assembled into the sealing device by the consumer. 
     The sealing device 50i may incorporate any of the features described above in connection with other embodiments, e.g., the weakened portions 140 (FIGS. 28-30) for facilitating severing the end of a sealing device to shorten its length, flexible links 160, 161 (FIGS. 38-39) to flexibly interconnect sections of the seal actuating element to improve sealing on uneven floor surfaces, means 175-179 (FIG. 140) for modularly interconnecting sealing devices to provide a longer composite sealing device. 
     While the invention has been described and illustrated in connection with preferred embodiments, many variations and modifications as will be evident to those skilled in this art may be made without departing from the spirit and scope of the invention. For example, sealing devices may be provided with different cam elements or bearing elements depending upon the particular application and mounting location. Also, cam elements may be provided with different cam surfaces depending upon the particular application, and different mechanisms may be provided for adjusting the cam elements. Further, the sealing devices (including the spring elements) may be made from different materials consistent with the functions that the different parts of the sealing device are to perform and the long service life desired. For the OEM market, the sealing devices may be provided without the capability for length adjustment since they will be manufactured for use with a particular closure. The sealing element may have various profiles and be replaceably attached to the seal actuating element in various ways, or may be integrally connected to the seal actuating element possibly by being molded therewith. Also, many pans may be reversed relative to other parts. For example, a cam element may be connected to the seal actuating element and a projection may be provided on the door jamb, and the locations of respective parts for slide-fitting or snap-fitting the cover to the support element may be reversed. The invention as set forth in the appended claims is thus not to be limited to the precise details of construction set forth above as such variations and modifications are intended to be included within the spirit and scope of the invention as defined in the appended claims.