The present invention relates to an exit device for latching a hinged door into a frame; more particularly, to a recessed door latch system configured to operate the door latch while presenting a narrower exposed latch (push bar) profile than current latch profiles.
Existing exit devices include some type of locking element such as a latch mechanism, which may be, for example, a Pullman style latch mechanism, a latch mechanism having a latch in the shape of a starwheel, a surface vertical rod latch mechanism, a concealed vertical rod latch mechanism or a mortise style latch mechanism. The locking element within the latch mechanism (referred to generically herein as a “latch”) is required to rotate or retract out of the way of the mating locking element to reach a state of being unlocked. The latch may be mounted in a door and the mating locking element (referred to herein generically as a “strike”) may be mounted on a door frame, or vice versa, to equal effect. The locking element may be disposed adjacent a side edge of the door and/or a top or bottom edge of the door.
Exit devices may typically employ what is commonly referred to as a panic bar to enable actuation of the exit device so as to enable door opening. Panic bars allow users to open the door without necessarily requiring the use of their hands. Rather, the user's body or other object can be used to push against the panic bar until the latch is retracted from the strike. Alternatively or additionally, exits devices may also include provision of an electrically actuatable latch such that, upon initiation, an electric current is supplied to an actuator to withdraw the latch from the strike.
To preserve the structural integrity of a fire door, panic bars are typically mounted onto the interior and/or exterior face of the fire. As a result, a high profile of the panic bar extends outwardly from the door and into the space immediately before the door. In certain instances, such as when used in a hospital or other medical setting, the outwardly extending panic bar may present hazards to medical personnel or patients. For instance, the panic bar may present an object which may by struck by medical patients, such as those confined to a wheel chair or hospital bed, or may otherwise interfere with clearances of these and other hospital conveyances, such as gurneys, equipment carts and portable laboratory equipment.
Therefore, in a fire door application, what is needed in the art is a panic bar and associated latch mechanism, wherein the panic bar, without compromising the integrity of the fire door, presents a smaller profile beyond the surface of the door while also providing sufficient travel of the panic bar to effect actuation of the latch mechanism and withdrawal of the latch from the strike.
It is a principal object of the present invention to address these, as well as other, needs.
Briefly described, an exit device having a panic bar may be configured for use in conjunction with a door latch system. The door latch system releasably secures a door in a door frame wherein the door latch system is selectively moveable from a latched position whereby the door is secured in the door frame, to an unlatched position whereby the door is releasable from the door frame. The exit device is configured to reside at least in part within a recess or mortise defined within a body of the door.
In one aspect of the present invention, the height of the panic bar extending beyond the outer surface of the door when said panic bar is in said extended position is reduced.
Numerous applications, some of which are exemplarily described below, may be implemented using the present invention.
The present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate currently preferred embodiments of the present invention, and such exemplifications are not to be construed as limiting the scope of the invention in any manner.
Referring to
Door 20 includes a first face 36 and a second face 38 opposite first face 36, and a recess 32 defined within body 34 of door 20 for receiving exit device 10 (
As shown more clearly in
Door 20 may be a solid core door, such as but not limited to a solid wood door or a door having a non-wood core, such as a fiberglass core with wood veneer. In one aspect of the present invention, a door 20 may be employed as a fire door which meets or exceeds applicable fire-code regulations. In a further aspect of the present invention, door 20 may be a hollow core door configured to include internal structural supports selectively positioned within body 34 so as to define recess 32 therein.
As shown in
With continued reference to
Moreover, securing fasteners within the thinner webbing of body portion 34a may also lead to premature door failure upon repeated use, such as through formation of cracks which may result from the reduced door thickness of the webbing repeatedly experiencing the forces applied to panic bar 18 by users or through action of latch mechanism 12. Consequently, the door's ability to act as a fire barrier may be compromised by the cracks as the forces applied to panic bar 18 are directed into the thinner door webbing via the fasteners. In contrast, by orienting fasteners 56a substantially normal to transverse plane P, forces applied to panic bar 18 are directed into body 34 through fasteners 56a, and not into the thinner webbing of body portion 34a.
The open terminal ends (opposite back plate 42) of top wall 44, bottom wall 46, left side wall 48 and right side wall 50 may include a respective outwardly extending lip portion 44a, 46a, 48a, 50a. Each lip portion 44a, 46a, 48a, 50a may be formed so as to abut against first face 36 of door 20 when reinforcing assembly 40 is secured within recess 32 as described above. In this manner, lip portions 44a, 46a, 48a, 50a may conceal the cut edge of door 20 forming recess 32. Moreover, in the event that door 20 is to operate as a fire door in accordance with applicable building fire codes, lip portions 44a, 46a, 48a, 50a may also slow or even prevent ingress of flames into recess 32, thereby extending the fire barrier lifetime of door 20. Fire retardant insulation material 60 may also be used to fill any gaps along the bottom or walls of body 30 between recess 32 and reinforcing assembly 40, thereby further improving the fire rating of door 20.
Lip portions 44a, 46a, 48a and 50a may also serve to provide support for reinforcing assembly 30 via face 36 of door 20, thereby minimizing or eliminating the force exerted against the thinner webbing of body portion 34a when an opening force is applied to panic bar 18.
While shown and described as a closed mortise, it should be understood by those skilled in the art that recess 32 may be an open mortise whereby one or both ends of the mortise coincide with a side edge of door 20, such as side edge 62 (
Note that, in accordance with the invention, the reinforcing assembly may be configured to receive any type of latch mechanism that may be mounted in a mortise recess formed in the face of a door.
While the invention has been described by reference to various specific embodiments, it should be understood that numerous changes may be made within the spirit and scope of the inventive concepts described. Accordingly, it is intended that the invention not be limited to the described embodiments, but will have full scope defined by the language of the following claims.
The present application is a continuation of U.S. patent application Ser. No. 16/006,991, filed Jun. 13, 2018, now U.S. Pat. No. 10,794,084, which claims the benefit of U.S. Provisional Patent Application No. 62/520,158, filed Jun. 15, 2017, which are hereby incorporated by referenced in their entirety.
Number | Date | Country | |
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62520158 | Jun 2017 | US |
Number | Date | Country | |
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Parent | 16006991 | Jun 2018 | US |
Child | 17029592 | US |