The present invention relates to multi-point door latches and more particularly to a multi-point door latch particularly suitable for use with sliding doors.
There remains a need for sliding door locks with increased strength and multiple connection points between the sliding door and the corresponding door jamb. The increased strength and multiple connection points reduce the chance of a successful forced entry and allow the lock to be used with relatively heavy doors and in other applications in which the lock may be placed under relatively high tension.
A standard sliding door installation, such as a sliding glass door, typically includes a latch or lock mounted in the face of the stile of the sliding door. Most such locks have a single hook or latching element that interacts with a keeper plate on the corresponding door jamb. A lock with two hooks or latches provides at least two advantages over a lock with a single hook. First, the lock with two connection points can be constructed to withstand higher forces. Second, if the two hooks are oriented in opposite directions, it precludes the possibility of tilting or lifting the door to disengage the hooks from the keeper plate and thus defeat the lock. Many multi-point sliding door locks are complex, relatively expensive and require substantial modification of the stile of the sliding door during installation of the lock. Thus, there remains a need for a simple, strong, relatively inexpensive and easy to install multi-point sliding door lock.
Most sliding door locks employ a rotating or pivoting hook as the attachment point between the sliding door and the keeper plate. The hook rotates between an unlocked position in which it is within the housing of the door lock and a locked position in which it rotates out of the housing to engage the keeper plate. Locks based on a sliding engagement mechanism may be constructed to be stronger than locks based on a rotating mechanism. It is believed that a multiple point door lock based on a sliding engagement mechanism and adapted to fit into the standard opening of a sliding door stile are not known in the art.
The present invention provides a lock particularly adapted for increased security against forced entry and heavy doors. The lock provides two points of attachment between the lock and the keeper plate. The attachment means slide rather than rotate allowing for very strong reinforcement of the attachment means which, in turn, allows for a very strong attachment between the lock and the keeper plate. Such strength minimizes the chances of a forced entry accomplished through failure of the lock. Preferably, the attachment means are hooks oriented in opposite directions. Such orientation eliminates the possibility of gaining entry by lifting the hooks out of the opening in the keeper plate by tilting or lifting the door.
Preferably, the lock is sized to fit into standard size openings for receiving locks in the stile of a sliding door. The latch may also be provided with a mechanism to prevent the latch from being placed into the locked position unless the sliding door is closed against the opposing jamb.
The following description relates only to a preferred embodiment of the invention. The specific features described below do not limit the scope of the invention.
As shown in
The description of hooks 32 and 34 will be made with particular reference to hook 32, however, hooks 32 and 34 are essentially identical except that they are mirror images of each other. As shown in
In the fully latched position, shown in
Reinforcement block 80 is held in position by screw 90, peg 94 within raceway 96 and tab 98 (
As shown in
Safety plunger 36 is designed to prevent an operator of the latch from locking the latch unless the door 16 (
The foregoing description is of a preferred embodiment of the invention. Various changes, modifications or substitutions may be made in the disclosed embodiment without departing from the scope or spirit of the invention.
This is application is a continuation application and claims the benefit of application Ser. No. 13/065,499 filed Mar. 22, 2011.
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Number | Date | Country | |
---|---|---|---|
Parent | 13065499 | Mar 2011 | US |
Child | 14559900 | US |