1. Field of the Invention
The present invention relates generally to fenestration products, such as a door assembly, for installation into a building. More particularly, the present invention concerns a reinforced fenestration product design that utilizes standard door hardware but still reduces the risk of intrusion through the product.
2. Discussion of Prior Art
The security of a building is highly dependent on the ability of an exterior door assembly to withstand large impact loads exerted against the outside of the door. This has previously been identified in our co-pending applications for U.S. Letters patent Ser. No. 08/864,547, filed May 28, 1997, entitled REINFORCED FENESTRATION PRODUCT; Ser. No. 09/136,990, filed Aug. 20, 1998, entitled REINFORCEMENT MEMBER FOR A FENESTRATION PRODUCT; Ser. No. 09/137,023, filed Aug. 20, 1998, entitled METHOD OF REINFORCING A DOOR; and Ser. No. 09/128,517, filed Aug. 3, 1998, entitled IMPROVED STRIKE PLATE FOR A DOOR ASSEMBLY; all of which are assigned of record to the assignee of the present application. It is noted that these prior applications disclose various inventions that improve the security provided by a fenestration product. As particularly indicated in the '517 application, there is still a risk of intrusion through a conventional door assembly, even though one or both of the doorjambs has been reinforced. Specifically, it has been determined that a large impact load exerted against the exterior side of the door may cause the door latch bolt and lock bolt to fail (e.g., bend). This is believed to be attributable to the fact that a conventional door assembly will often require the distal ends of the latch bolt and, more importantly, the lock bolt to resist movement of the door when a large impact load is exerted against the exterior side of the door. There will consequently be a large moment experienced by the bolts, and they therefore have a tendency to fail (e.g., bend) under these conditions.
Responsive to these and other problems, an important object of the present invention is to provide an improved fenestration product that reduces the risk of intrusion therethrough. It is also an object of the present invention to provide an inexpensive and simple method of reinforcing a fenestration product. It is particularly an important object of the present invention to provide a reinforced fenestration product designed to prevent intrusion therethrough, without requiring new door latch or lock designs. In this respect, an important object of the present invention is to provide a fenestration product that is designed to prevent the door latch bolt and lock bolt from experiencing large moments when an impact load is exerted against the exterior side of the door. Another important object of the present invention is to provide such a fenestration product, with the product utilizing standard door hardware.
In accordance with these and other objects evident from the following description of the preferred embodiment, the present invention concerns a door assembly including a generally flat door jamb that presents an inwardly facing inner face and a generally oppositely facing outer face. A reinforcement plate is secured flatly against the outer face of the door jamb. Moreover, the door hardware (e.g., hinges and/or strike plates) positioned along the inner face of the doorjamb are fastened to the reinforcement plate so that movement relative to the reinforcement plate and doorjamb is prevented.
It is believed that this inventive arrangement essentially prevents dislodgement of standard door hardware when an impact load is exerted against the exterior side of the door. That is to say, the standard door hardware on the reinforced door assembly does not become the weak point of the product. This not only serves to reinforce the jamb to which the hardware is attached, but it also significantly reduces the risk of intrusion often associated with standard hardware failure. With particular respect to the strike plate, it has been determined that the inventive arrangement substantially decreases the moment experienced by the door latch bolt and lock bolt when a large impact load is exerted against the exterior side of the door, whereby failure of the door lock and door latch is virtually eliminated. In other words, because the strike plate is retained in the intended location, the door latch bolt and lock bolt resist movement of the door (e.g., when a large impact load is exerted against the exterior side of the door) generally at their respective bases (i.e., at a point along their respective lengths adjacent the side of the door), rather than adjacent their distal ends, as particularly described in the '517 application.
If desired, a sidelight assembly may be associated with the door assembly, with one of the window jambs being connected to the door jamb in such a manner that the reinforcement plate is located between the adjacent window and door jambs. The present invention is also concerned with an inventive method of reinforcing a door assembly, wherein the door hardware is fastened to the reinforcement plate secured flatly against the outer face of the doorjamb.
Other aspects and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments and the accompanying drawing figures.
Preferred embodiments of the invention are described in detail below with reference to the attached drawing figures, wherein:
Turning initially to
Those ordinarily skilled in the art will appreciate that the illustrated framework 16 has been provided for illustrative purposes only. That is, it is entirely within the ambit of the present invention to install the fenestration product 10 in buildings having various other constructions. Moreover, it shall be understood that the term “building” as used herein means any structure having an area which may be accessed through a door assembly (e.g., houses, multi-dwelling structures, commercial structures, etc.).
With the foregoing caveat in mind, the illustrated door assembly 12 includes an open framework comprising a pair of laterally spaced flat doorjambs 34 and 36 extending between the sub-floor and header 22, an upper cross-beam 38 fixed between the upper ends of the jambs 34 and 36 to be located adjacent the header 22 when the product is installed, and a sill 40 extending between the lower ends of the jambs 34 and 36 for attachment to the sub-floor (see
The door assembly 12 further includes a door 42 swingably mounted to the jamb 34, with the door 42 being configured to fit within the framework when swung to a closed position (see
The door jamb 36 is provided with a pair of vertically spaced bolt-receiving holes 46 and 48. In the usual manner, the door 42 is provided with a latch mechanism 50 having a bolt 52 that is yieldably urged outwardly to be automatically inserted into the lower hole 48 when the door 42 is closed, whereby the latch bolt 52 serves to releasably retain the door 42 in the closed position. Rotatable interior and exterior handles 54 and 55 are operably coupled with the latch bolt 52 to retract the latter into the door 42 and out of the hole 48 when it is desired to swing the door 42 out of the closed position. The door 42 further includes a lock mechanism 56 for securely locking the door 42 in its closed position. Similar to the latch mechanism 50, the lock mechanism 56 is provided with a reciprocating bolt 58 that is shiftable into and out of the upper jamb hole 46, although it is noted that the lock bolt 58 has a relatively longer throw than the latch bolt 52 (see
In the usual manner, the door assembly 12 includes various hardware for associating the door 42 with the door jambs 34 and 36. As will subsequently be described, the door hardware preferably has a standard and conventional construction, however, it is not susceptible to the problem of dislodgement often associated with traditional door assemblies. The hardware of the illustrated door assembly 12 includes three hinges 62,64,66 and a pair of strike plates 68 and 70. In the usual manner, the hinges 62,64,66 serve to swingably mount the door 42 on the jamb 34, while the strike plates 68,70 serve to, among other things, reinforce the jamb 36 in the vicinity of the bolt-receiving holes 46,48.
With particular respect to the hinges 62–66, this hardware has a universal construction, and it is consequently sufficient to describe only one of the hinges with the understanding that the remaining hinges are similarly constructed. As shown in
As perhaps best shown in
A pair of reinforcement plates 86 and 88 are associated with respective ones of the doorjambs 34 and 36. The plates 86 and 88 are similar to the reinforcement structure shown in the '547, '990 and '023 applications, which are incorporated by reference herein. Not only do the plates 86 and 88 afford the advantages identified in these applications, they also provide a strong anchoring point for the door hardware, as will subsequently be described.
Turning first to the hinge side reinforcement plate 86, this component comprises a flat, rectangular body that fits conveniently in the normal space provided between the cripple stud 18 and doorjamb 34. The plate 86 is preferably formed of an approximately ⅛ inch thick piece of aluminum. The illustrated plate 86 has a length of approximately seventy-six inches and a width of approximately three inches. Although the plate 86 is shorter and narrower than the illustrated doorjamb 34, it will be appreciated that the preferred dimensions fit virtually all doorjamb sizes. That is to say, the plate 86 is dimensioned so that it does not project beyond the boundaries of a traditional doorjamb. In addition, the preferred plate length ensures that the plate 86 will extend substantially the full length of virtually any doorjamb. If desired, the plate 86 may alternatively be dimensioned to be coextensive with the doorjamb 34. In any case, the reinforcement plate 86 is secured flatly against the outer face of the doorjamb 34, preferably with the lower ends and interior sides of the jamb 34 and plate 86 being flush. In the illustrated embodiment, the plate 86 is initially secured to the jamb 34 by three mounting screws 90 that are received in respective openings 92 defined in the plate 86 and threaded into the jamb 34. The screws 90 are preferably countersunk in the plate 86 and may comprise standard one inch wood screws. The reinforcement plate 86 is further provided with four longitudinally spaced attachment screw openings 94. Preferably, the reinforcement plate 86 is used as a template to form by suitable means, such as drilling, the openings 96 in the jamb 34. Each set of aligned openings 94 and 96 is configured to received an attachment screw 98 therein. As perhaps best shown in
In particular, the hinges 62,64,66 are positioned along the inner face of the jamb 34 in the illustrated locations, with the positioning of the hinges being facilitated as a result of the recesses formed in the jamb, as noted above. The first plate 72 of each hinge is then preferably used as a template to facilitate formation of the openings 100 and 102, with the openings being formed by suitable means (e.g., drilling). In addition, although the first plate 72 of each of the illustrated hinges 62,64,66 is provided with four screw-receiving openings, each of the first plates is associated with only two sets of aligned openings 100,102. In this respect, it is entirely within the ambit of the present invention to vary the number of sets of aligned openings 100,102 associated with each of the hinges (e.g., the upper hinge 62 may be associated with three sets of aligned openings 100,102). In any case, a fastening screw 104 is inserted through the first plate 72 of each of the hinges 62,64,66 and into each set of aligned openings 100,102. In the illustrated embodiment, the screw 104 and openings 100,102 are cooperatively designed so that the screw 104 threadably engages the reinforcement plate 86 and jamb 34 along the respective openings 100 and 102. Preferably, the screw 104 comprises a standard thread cutting screw and the openings 100,102 are standard pilot holes dimensioned to receive the screw 104 as it forms the threads in the jamb 34 and reinforcement plate 86. It is noted that the corresponding openings in the first plate 72 of each of the hinges 62,64,66 is relatively larger than the openings 100,102, such that the screw 104 is slidably received within each of these openings. In other words, the illustrated hinges 62,64,66 do not threadably engage the screws 104, although it is entirely within the ambit of the invention to do so. It is also possible to vary the size of the opening 102 defined in the jamb 34 so that the screw 104 is slidably received within the jamb 34 rather than being threadably interengaged therewith.
However, it is important that each of the hinges 62,64,66 be securely fastened to the reinforcement plate 86. Particularly, each of the hinges 62,64,66 is prevented from shifting relative to the plate 86 as a result of the interlocking threaded interengagement of the screws 104 and reinforcement plate 86. The hinges 62,64,66 are otherwise separate and disconnected from the reinforcement plate 86, which consequently permits the use of standard hinges in the door assembly 12. It is noted that the reinforcement plate 86 is particularly well suited for use with the thread cutting screws 104 as a result of the plate 86 being formed of metal, such as the preferred aluminum material. Moreover, the principles of the present invention are equally applicable to various other arrangements for securely fastening standard hinges to the reinforcement plate 86. For example, the reinforcement plate 86 may be provided with a previously internally threaded opening that is configured to receive an externally threaded bolt, with such an arrangement likewise benefitting from the reinforcement plate being formed of metal.
As shown in
The strike plate side reinforcement plate 88 is similar in design and function to the hinge side reinforcement plate 86. Thus, it shall be sufficient to explain that the strike plate side reinforcement plate 88 is secured against the outer face of the jamb 36 by mounting screws 110 received within respective openings 114 defined in the plate 88 (see
The inventive method of reinforcing the door assembly 12 should be apparent from the previous description. It is therefore sufficient to explain that the reinforcement plates 86 and 88 are first placed against the outer faces of the respective doorjambs 34 and 36. It may be necessary to shift the plates 86 and 88 along the outer faces of the respective jambs 34 and 36 until certain openings and/or edges are aligned. For example, the lower end and interior side of the hinge side reinforcement plate 86 are positioned generally flush with the corresponding end and side of the jamb 34, in the illustrated embodiment. On the other hand, the bolt-receiving opening 124 and interior side of the strike plate side reinforcement plate 88 are respectively aligned with the bolt-receiving hole 46 and interior side of the jamb 36. The reinforcement plates 86 and 88 are then secured to the jambs 34 and 36 by the mounting screws 90 and 110, respectively. The attachment screw openings 96 and 116 are then formed in the jambs 34 and 36, using the openings 94 and 114 in the reinforcement plates 86 and 88 as templates. In most instances, the previous steps would be performed at the mill or factory, although it is entirely within the ambit of the present invention to perform all of the steps in the field (i.e., at the building construction site) or at the factory. In any case, the product 10 is then preferably set within the opening 14 of the building framework 16. This may require temporary attachment of the door framework to the building framework, such as by nailing the former to the latter, and the door assembly 12 is shimmed within the opening 14. In the illustrated embodiment, shims 126,128,130 are wedged into the spaced defined between the cripple stud 18 and reinforcement plate 86, with each of the shims being vertically aligned with a respective one of the hinges (see FIGS. 2,5 and 6). On the opposite side, shims 132,134,136,138 are wedged between the cripple stud 120 and reinforcement plate 88, with each of these shims being generally vertically aligned with one of the attachment screws 118. Two shims 140 and 142 are preferably wedged between the header 22 and cross-beam 38, with a pair of attachment screws 144 being provided to securely fasten the cross-beam 38 to the header 22. At this point, the door hardware (i.e., the hinges 62,64,66 and strike plate 68,70) is preferably installed. As noted above, the preferred method involves first forming pilot holes in the respective door jamb and reinforcement plate using the door hardware as a template. The fastening screws 104 or 122 are subsequently inserted through the corresponding hardware and then threaded into the respective door jamb and reinforcement plate. Of course, attachment of the door hardware need not occur after the door assembly 12 has been set in the building framework 16, but rather such attachment may occur as soon as the reinforcement plates 86 and 88 have been mounted to the respective door jambs 34 and 36. Finally, the product 10 is securely attached to the building framework 16 by installing the attachment screws 98,118,144.
It will be appreciated that this installation virtually eliminates intrusion that might otherwise be achieved by exerting a large impact load on the exterior side of the door 42. Not only is the door framework, especially the jambs 34 and 36, reinforced, but the standard door hardware is securely mounted so as not to be dislodged during such an intrusion. With particular respect to the strike plates 68 and 70, the latch bolt 52 and lock bolt 58 are not required to resist movement of the door 42 out of its closed position solely at their respective outermost ends. Instead, the strike plates 68 and 70 engage the lock bolt 58 and latch bolt 52, respectively, much closer to the door 42 to which the bolts are mounted. The moments experienced by the bolts 52 and 58 is consequently not likely to cause failure (e.g., bending of the bolts 52 and 58).
The principles of the present are equally applicable to various other fenestration product designs. For example,
Such an arrangement is shown in
The preferred forms of the invention described above are to be used as illustration only, and should not be utilized in a limiting sense in interpreting the scope of the present invention. Obvious modifications to the exemplary embodiments, as hereinabove set forth, could be readily made by those skilled in the art without departing from the spirit of the present invention.
The inventors hereby states their intent to rely on the Doctrine of Equivalents to determine and assess the reasonably fair scope of the present invention as pertains to any apparatus not materially departing from but outside the literal scope of the invention as set forth in the following claims.
This is a continuation of application Ser. No. 09/272,074, filed Mar. 18, 1999 now U.S. Pat. No. 6,185,881.
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Number | Date | Country | |
---|---|---|---|
Parent | 09272074 | Mar 1999 | US |
Child | 09715809 | US |