Patent Application
20110175378
The present invention is related to door latch systems, and in particular to an adjustable door strike that can be adjustably positioned along a doorframe to accept a latch and/or deadbolt.
One of the most difficult and time consuming tasks associated with installing a door lock is aligning the latch (mounted on the door) with the door strike (mounted on the door frame). Misalignment between the latch and the door strike prevents the door from being latched and locked.
In many applications, once the latch has been positioned on the door, it is difficult if not impossible to re-position. Likewise, many doorframes come with prefabricated slots for mounting the door strike, making it difficult to adjust the position of the door strike. If there is misalignment between the door strike and the latch, the installer is typically required to machine or file a portion of the strike to accept the latch. The installation can therefore be time-intensive, expensive, and visually unappealing.
An adjustable door strike system for mounting onto a doorframe allows the position of the door strike to be adjusted during installation without having to re-drill holes. The system includes a mounting bracket and an adjustable strike. The mounting bracket includes a first mounting aperture, a second mounting aperture and a rectangular opening located between the first mounting aperture and the second mounting aperture. The adjustable strike includes a first slotted aperture located on a first edge of the adjustable strike, a second slotted aperture located on a second edge opposite the first edge of the adjustable strike, and a latch opening. The adjustable strike is secured between a doorframe and the mounting bracket by a first screw mounted through the first mounting aperture, through the first slotted aperture and into the doorframe and by a second screw mounted through the second mounting aperture, through the second slotted aperture and into the doorframe. The position of the adjustable strike can be adjusted in the region defined by the first and second slotted apertures. Having positioned the adjustable strike to align with a latch and/or deadbolt, the screws are tightened, thereby clamping and securing the adjustable strike between the doorframe and the mounting bracket.
The present invention provides an adjustable strike mounting system that allows for positional adjustment of the adjustable strike. In particular, the design provides a solution that is straight forward to install, maintain, and provides a degree of physical security not available in most adjustable door strike systems.
In an exemplary embodiment, the adjustable mounting system is employed in a doorframe having pre-fabricated cavity 30 and pre-drilled holes 32a and 32b. In the prior art, a door strike is formed to fit within pre-fabricated cavity 30, but without a mechanism by which the position of the door strike could be modified. The present invention overcomes this problem by dividing the typical door strike into two portions, mounting bracket 10 and adjustable strike 12.
In an exemplary embodiment, the length of mounting bracket 10 is approximately equal to the length of cavity 30, allowing mounting bracket 10 to fit securely within cavity 30. Likewise, pre-drilled holes 32a and 32b are positioned to be aligned with mounting apertures 14a and 14b. Thus, the position of mounting bracket 10 cannot be adjusted. However, the position of latch opening 22 and deadbolt opening 20 (and thus alignment between the latch and latch opening as well as deadbolt and deadbolt opening) is determined by the position of adjustable strike 12, which is designed to be adjustable. In particular, adjustable strike 12 is sized to be slightly smaller than cavity 30. In an exemplary embodiment, adjustable strike 12 has a length that is less than the length of cavity 30, allowing the position of adjustable strike 12 to be adjusted in the vertical direction within cavity 30.
In addition, instead of mounting apertures (as used on mounting bracket 10), adjustable strike 12 employs slotted apertures 18a and 18b which are greater in size than mounting apertures 14a and 14b. In particular, slotted apertures 18a and 18b may be larger in the vertical direction than mounting apertures 14a and 14b, allowing the position of adjustable strike to be adjusted in the vertical direction within the space allowed by the slotted apertures. For example, if adjustable strike 12 is positioned such that screws 28a and 28b are located in the middle of slotted apertures 18a and 18b, but adjustable strike 12 is too low for proper alignment, then adjustable strike 12 can be adjusted upward by an amount defined by the bottom of slotted aperture 18a. Likewise, adjustable strike 12 can be adjusted downward by an amount defined by the top of slotted aperture 18b.
In another exemplary embodiment, the width of adjustable strike 12 as well as the width of slotted apertures 18a and 18b (as compared with mounting apertures 14a and 14b) are sized to allow for horizontal adjustment of adjustable strike 12. The necessity for vertical adjustments is more common, but horizontal adjustment may also be beneficial.
The present invention is particularly useful in applications in which cavity 30 and pre-drilled holes 32a and 32b are formed prior to installation of the doorframe, because the pre-fabricated door will not allow for adjustment of the location of mounting bracket. However, the present invention may be employed in applications in which an installer defines the location of cavity 30 and pre-drilled holes 32a and 32b.
Thus, during installation an installer positions adjustable strike 12 within cavity 30. Mounting bracket 10 is placed over the top of adjustable strike 12, also within cavity 30, and screws 28a and 28b are threaded through mounting apertures 14a and 14b, respectively, through slotted apertures 18a and 18b, respectively, and into pre-drilled holes 32a and 32b, respectively, of doorframe 26. Before tightening screws 28a and 28b, an installer checks the alignment between the latch assembly (not shown) and latch opening 22 (this may also include checking alignment between a deadbolt assembly, not shown, and deadbolt opening 20). If the alignment is correct, then screws 28a and 28b are tightened to clamp adjustable strike 12 between mounting bracket 10 and doorframe 26, thereby holding adjustable strike 12 in the desired position. If the alignment is not correct, then the installer adjusts the vertical and/or horizontal position of adjustable strike 12 within the limits defined by slotted apertures 18a and 18b before tightening screws 28a and 28b. A benefit of the embodiment described with respect to
A benefit of the adjustable strike described with respect to
In addition to improving the installation and security of adjustable strike mounting systems, the present invention also improves maintenance associated with adjustable strike systems. For instance, often buildings settle after being built, resulting in mis-alignment between adjustable strike 12 and the latch and/or deadbolt. Typically, this would require filing the adjustable strike itself, or re-drilling holes in the doorframe to move the position of the adjustable strike. The present invention allows the position of adjustable strike 12, and in particular the position of deadbolt opening 20 and latch opening 22, to be adjusted without having to re-drill holes in doorframe 26. Rather, screws 28a and 28b are loosened, allowing an installer to reposition adjustable strike 12 either in the horizontal or vertical direction depending on the mis-alignment, and then secure adjustable strike 12 in the desired position by re-tightening screws 28a and 28b
Another advantage of the embodiment of the present invention described with respect to
Once again, for applications in which doorframe 56 includes a pre-made cavity 60 and pre-drilled holes 62a and 62b, mounting bracket 40 is sized to fit within pre-made cavity 60 while adjustable strike 42 is sized slightly smaller (i.e., shorter length as compared with mounting bracket 40) to allow adjustable strike 42 to be adjusted in the vertical direction within pre-made cavity 60. Adjustable strike 42 may also have shorter width as compared with mounting bracket 40 to allow adjustable strike 42 to be adjusted in the horizontal direction as well. In other embodiments, an installer is required to form cavity 60 and drill holes 62a and 62b during installation. However, the present invention is particularly useful in application in which cavity 60 and holes 62a and 62b are formed prior to installation of the doorframe, because the pre-fabricated door will not allow for adjustment of the location of a typical mounting bracket and door strike.
Having inserted screws 58a and 58b through mounting bracket 40 and adjustable strike 42, but before tightening the screws, an installer can adjust the position of adjustable strike 42. The amount of adjustment provided by adjustable strike 42 is dependent on the size of slotted apertures 50a and 50b. Each slotted aperture 50a and 50b is once again larger than mounting apertures 44a and 44b. In an exemplary embodiment, slotted apertures 50a and 50b are elongated in the vertical direction, allowing the position of adjustable strike 42 to be adjusted in the vertical direction. In this embodiment, the length of adjustable strike 42 is less than the length of mounting bracket 40, allowing adjustable strike 42 to be adjusted in the vertical direction within cavity 60. The size of slotted apertures 50a and 50b, as well as the length of adjustable strike 42 determines the amount of vertical adjustment available. In another exemplary embodiment, slotted apertures 50a and 50b are elongated (with respect to mounting apertures 44a and 44b) in the horizontal direction as well, allowing adjustable strike 42 to be adjusted in both the horizontal and vertical directions.
Having positioned adjustable strike 42 in the desired location, an installer tightens screws 58a and 58b, clamping adjustable strike 42 between doorframe 56 and mounting bracket 40. Adjustable strike 42 is properly positioned when the latch (not shown) and deadbolt (not shown), both of which are secured to the door, are properly aligned with latch opening 54a and deadbolt opening 52.
Benefits of mounting bracket 40 and adjustable strike 42 once again extend to both the installation, security and maintenance of door lock system. Following installation, if the latch or deadbolt assembly becomes mis-aligned with latch opening 54 and deadbolt opening 52, respectively, an installer can loosen screws 58a and 58b and adjust the vertical and/or horizontal position of adjustable strike 42. Following the re-alignment, screws 58a and 58b are re-tightened through holes 62a and 62b such that mounting bracket 40 and adjustable strike 42 are once again secured in place. Once again, the embodiment of adjustable strike 42 shown in
Although the present invention has been described with reference to preferred embodiments, workers skilled in the art will recognize that changes may be made in form and detail without departing from the spirit and scope of the invention. For example, in both of the embodiments described with respect to
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/US2008/010901 | 9/19/2008 | WO | 00 | 3/18/2011 |
