Most consumers are familiar with the operation of common single- and two-bore entry door locks that have a handle for the latch and a thumbturn/key cylinder for a deadbolt located directly above the handle. The lock systems used for patio doors, however, can be very different from entry door locks. Patio systems often have a means of locking the door that may be actuated by a handle, actuated by a thumbturn, or may require actuation by a combination of both the handle and the thumbturn. To offer a higher level of security, many patio doors offer multi-point locks with gearboxes to operate the various lock members. For operators not familiar with these types of locks, however, confusion may result with regards to operation. For example, the thumbturn or key cylinder may be located below rather than above the handle. Also, the methods of actuating the various locking members in a multi-point lock system are significantly different than the common two-bore door locks that consumers are most familiar with. When a consumer is not familiar with a multi-point lock system, they may harbor a misconception that the door is locked when the thumbturn is rotated, as is often the case with a typical entry door deadbolt. However, simply turning the thumbturn in many gearbox systems only arms the lock, but leaves the door in an unsecured state. Thus, without specific familiarity, an operator may leave the door unsecured even though they think the door has been locked. This risk is especially high for visitors to a residence or business, such as a babysitter or other caretaker.
In the multi-point lock described herein, a thumbturn/key cylinder is located above a handle, similar to common two-bore entry door locks. The deadbolt may be extended into the locked position by rotating the thumbturn/key cylinder, which places the door into an acceptable minimum level of security, as expected by a consumer that is familiar with standard entry door locks. The additional operation of rotating the handle in an upward direction will add the multi-point level of security, but is not required to achieve a reasonable level of security for the door. The additional locking elements, referred to herein with regard to a particular embodiment as “shoot bolts,” are prevented from being extended unless the deadbolt is first extended. Since the deadbolt is very visible when, it limits the likelihood of attempting to close the door with the shoot bolts extended, which would damage the door frame. This functionality is similar to that of the common two-bore lock system and is very intuitive to the typical consumer.
Because discrete deadbolt and latch housings are utilized, the deadbolt and latch assemblies contained therein can be greatly simplified. Also, discrete housings allow the lock described herein to be used on doors having both standard and non-standard spacing configurations between the thumbturn and the handle. For example, typical multi-point gearbox locks have a center-to-center (thumbturn to handle) distance of about 3.62 inches. The technology depicted herein allows for spacing up to and greater than about 5.5 inches. In other words, the discrete housing described herein may be installed anywhere along a lock face plate, as required or desired for a particular application. Increasing the distance between the handle and thumbturn may create a stronger locking force.
In one aspect, the technology relates to a lock including: a deadbolt assembly having a deadbolt and a deadbolt actuator; a latch assembly discrete from the deadbolt assembly, the latch assembly including a shoot bolt and a shoot bolt actuator; and a blocking element for blocking at least one of (a) actuation of the shoot bolt from an unlocked position to a locked position when the deadbolt is in a retracted position, and (b) actuation of the shoot bolt from a locked position to an unlocked position when the deadbolt is in an extended position. In an embodiment, the blocking element is a pawl, wherein when the deadbolt is in the retracted position, the pawl is in a blocking position that prevents movement of the shoot bolt from the unlocked position to the locked position, or prevents movement of the shoot bolt from the locked position to the unlocked position. In another embodiment, the deadbolt assembly includes a drive element engaged with the deadbolt and the pawl, wherein an extending movement of the deadbolt from the retracted position to the extended position causes a corresponding first movement of the drive element from a first position to a second position, such that the drive element moves the pawl from a blocking position to an unblocking position.
In another embodiment of the above aspect, the deadbolt assembly includes a drive element engaged with the deadbolt and the pawl, wherein a retracting movement of the deadbolt from the extended position to the refracted position causes a corresponding movement of the drive element from a second position to a first position, such that the drive element moves the pawl from a blocking position to an unblocking position. In yet another embodiment, the lock includes a spring element for biasing the pawl into the blocking position. In still another embodiment, the deadbolt actuator is adapted to engage with a thumbturn external to the deadbolt assembly and the shoot bolt actuator is adapted to engage with a handle external to the latch assembly. In another embodiment, the deadbolt assembly includes a deadbolt housing and the latch assembly includes a latch housing discrete from the deadbolt housing. In still another embodiment, the lock includes a face plate, wherein the deadbolt housing is secured to the face plate at the first location and wherein the latch housing is secured to the face plate at a second location.
In another aspect, the technology relates to a lock including: a deadbolt housing; a deadbolt located within the deadbolt housing; a deadbolt actuator for actuating the deadbolt; a shoot bolt selectively moveable between a locked position and an unlocked position, wherein the shoot bolt is actuated remote from the deadbolt housing; and a pawl located in the deadbolt housing, wherein the pawl blocks movement of the shoot bolt from at least one of (a) the unlocked position to the locked position, and (b) the locked position to the unlocked position. In an embodiment, the lock includes: a latch housing discrete from the deadbolt housing; and a latch assembly located within the latch housing, the latch assembly including a shoot bolt actuator for moving the shoot bolt from the unlocked position to the locked position. In other embodiments, the lock further includes a thumb turn for actuating the deadbolt actuator and/or a handle for actuating the shoot bolt actuator. In another embodiment, the lock includes a pawl bias element for biasing the pawl into a blocking position. In yet another embodiment, the lock incldues a deadbolt bias element for biasing the deadbolt into at least one of an extended position and a retracted position. In still another embodiment, the lock includes a deadbolt bias element for biasing the deadbolt into both of an extended position and a retracted position.
In another aspect, the technology relates to a method of actuating a multi-point lock, the method including: extending a first locking element using a first actuation element; and thereafter, extending a second locking element using a second actuation element, wherein the second locking element is extendable only by first extending the first locking element. In an embodiment, the method includes: retracting the first locking element using the first actuation element; and thereafter, retracting the second locking element using the second actuation element, wherein the second locking element is retractable only by first retracting the first locking element. In another embodiment, extending the first locking element removes a blocking element from a path of travel of the second locking element.
There are shown in the drawings, embodiments which are presently preferred, it being understood, however, that the technology is not limited to the precise arrangements and instrumentalities shown.
Another locking element (in the depicted embodiment, a deadbolt) 202 is actuated by a deadbolt assembly in the deadbolt housing 200, so as to move between extended and retracted positions. The deadbolt 202 may be actuated by a handle, thumbturn, or other device located proximate the deadbolt housing 200. In one embodiment, for example, a thumbturn T operably connected to an actuator 204 drives the remaining elements of the deadbolt assembly to actuate the deadbolt 202. In a commercial embodiment of the MPL 100, a thumbturn T actuates the deadbolt 202 and a handle H actuates the shoot bolts 302 and latch 304. In that regard, once installed, the MPL 100 maintains the outward visual appearance of a typical entry door lock (with regard to location and spacing of the thumbturn T and handle H), but with specific, unique functionality, as described below.
The upper shoot bolt 302 includes an elongate deadbolt opening 308 that allows for passage of the deadbolt 202 and engagement with the pawls 210, 212, as described below. One or more guide slots 310 engage one or more projections 218 located on one of the housing components 200b. A number of other slots 220 help ensure proper alignment of the various deadbolt assembly components during actuation of the deadbolt assembly. A number of screws, bolts, or other mechanical or chemical fasteners 222 secure the housing components 200a, 200b.
An intermediate position of the deadbolt 202 is depicted in
As the deadbolt pin 204b moves the deadbolt 202 forward, the drive pin 202a moves forward within the elongate drive slot 214c. Since the elongate drive slot 214c is pitched within the drive element 214, the drive element 214 moves from its first, lower position towards its second, higher position. As this occurs, the shape of the lower opening 214b forces the lower pawl actuator pin 212b back within the lower opening 214b, thus moving the lower pawl 212 from the blocking position to the unblocking position. Conversely, as the drive element 214 moves towards its second, higher position, the pawl spring 216 biases the upper pawl actuator pin 210b towards a front of the upper opening 214b. This, in turn, moves the upper pawl 210 towards the blocking position. The upper pawl 210 will be in the ready position until the shoot bolt 302 is moved to the locking position after the deadbolt 202 is fully extended.
At this point, the door is in a completely bolted and deadbolt locked condition (step 420). Due to the configuration of the lock (for example, the blocking pawls described above), attempting to force down either the interior or exterior handle will not unlock any the locking elements. Accordingly, unlocking of the door can only be accomplished by first retracting the deadbolt. This may be accomplished by turning the thumbturn (step 422) or the key (step 424), thereby retracting the deadbolt and unblocking the shoot bolts. Thereafter, to completely unlock the door, the interior handle (step 426) or the exterior handle (step 428) is then turned down to retract the shoot bolts from the locked to the unlocked position. It should be noted that, in certain embodiments, turning either handle down will also retract the latch (
Multi-point locks such as those described herein have many advantages over existing locks. A number of advantages will be apparent from a review of the specification and figures. In addition, the versatility of the deadbolt assembly allows the MPL to be used with virtually any type of remote-actuated locking elements, in addition to the shoot bolts described. For example, the shoot bolts may be replaced with more complex remote-locking mechanisms, such as those described in U.S. Pat. No. 6,389,855, the disclosure of which is hereby incorporated by reference herein in its entirety. In such an embodiment, the pawls described herein may be used to prevent movement of the actuators of the remote-locking mechanisms. Additionally, either or both of the upper and lower pawls may be included in a particular multi-point lock, depending on the desired functionality. If only the lower pawl 212 is included, extension of the shoot bolts will be prevented unless the deadbolt is extended. If only the upper pawl is included, retraction of the shoot bolts will be prevented unless the deadbolt is first retracted. Accordingly, many locking options are possible. The latch assembly may be virtually any configuration. The latch assembly utilized may actuate both the latch and the shoot bolts or the shoot bolts alone. Additionally, only one shoot bolt (either upper or lower) may be utilized depending on the application. In that regard, it should be noted that the pawls in the deadbolt assembly contact a deadbolt opening in the upper shoot bolt only. However, due to the shoot bolt-actuation mechanism located within the latch assembly, blocking movement of the upper shoot bolt prevents movement of the lower shoot bolt.
The materials utilized in the manufacture of the MPL may be those typically utilized for lock manufacture, e.g., zinc, steel, brass, stainless steel, etc. Material selection for most of the components may be based on the proposed use of the MPL, level of security desired, etc. Appropriate materials may be selected for an MPL used on patio or entry doors, or on doors that have particular security requirements, as well as on MPLs subject to certain environmental conditions (e.g., moisture, corrosive atmospheres, etc.). For particularly light-weight door panels (for example, cabinet door panels, lockers, or other types of panels), molded plastic, such as PVC, polyethylene, etc., may be utilized for the various components. Nylon, acetal, Teflon®, or combinations thereof may be utilized for the latch to reduce friction, although other low-friction materials are contemplated.
The terms first, second, upper, lower, higher, top, bottom, panel, jamb, door, frame, etc., as used herein, are relative terms used for convenience of the reader and to differentiate various elements of the MPL from each other. In general, unless otherwise noted, the terms are not meant to define or otherwise restrict location of any particular element. For example, the MPL may be installed on one or both panels of a double-entry door. In such an embodiment, matching handles and thumbturns may be utilized. The thumbturns may drive deadbolts that are slightly off-alignment, allowing a deadbolt to extend from each door to the opposite door. Alternatively, the projecting length of one deadbolt may be reduced, such that the deadbolt from the MPL on the primary door extends into the deadbolt housing on the secondary door. In such a case, rotation of the thumbturn on the secondary door may move the drive element and pawls, thus allowing the shoot bolts in the secondary door to be extended, even though a functioning deadbolt is not present. In another embodiment, all or a portion of the MPL may be installed on a door jamb configured to look like a second door panel.
While there have been described herein what are to be considered exemplary and preferred embodiments of the present technology, other modifications of the technology will become apparent to those skilled in the art from the teachings herein. The particular methods of manufacture and geometries disclosed herein are exemplary in nature and are not to be considered limiting. It is therefore desired to be secured in the appended claims all such modifications as fall within the spirit and scope of the technology. Accordingly, what is desired to be secured by Letters Patent is the technology as defined and differentiated in the following claims, and all equivalents.
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