An aspect of the present invention is a latch mechanism that is adapted to engage a door strike to releasably secure a door in a closed position. The latch mechanism includes a latch apparatus that is configured to be pivotally displaced about a latch axis between a first position and a second position. Additionally, the latch apparatus is adapted to securely engage the door strike when in the first position, and to be releaseable from engagement, with the door strike when in the second position. The latch mechanism also includes a cam device that is configured to be pivotally displaced about a transverse cam axis between a first engagement position and a second disengagement position. The cam device is also configured to operably engage the latch apparatus when the cam device is in the first engagement position and the latch apparatus is in the first position so as to prevent the latch apparatus from being displaced to the second position. Additionally, the cam device is configured to not inhibit the displacement of the latch apparatus from the first position to the second position when the cam device is in the second disengagement position. Further, the cam device is adapted for the transverse cam axis to generally extend in the direction of a width of the door, while the latch apparatus is adapted for the latch axis to generally extend in the direction of a length of the door.
Another aspect of the present invention is a latch mechanism that is adapted to engage a door strike to releasably secure a door in a closed position. The latch mechanism includes a latch apparatus that is adapted to be pivotally displaced about a latch axis between a first position and a second position. Additionally, the latch apparatus is adapted for secured placement of at least a portion of the door strike in a retention area of the latch apparatus when the latch apparatus is in the first position. The latch mechanism also includes a cam device that is adapted to be pivotally displaced about a transverse cam axis between a first engagement position and a second disengagement position. The transverse cam axis is generally perpendicular to the latch axis. The cam device also has a cam surface that is configured to engage the latch apparatus when the latch apparatus is in the first position and the cam device is in the first engagement position so as to prohibit displacement of the latch apparatus to the second position. The latch mechanism also includes a latch link that is adapted to be linearly displaced between an extended position and a retracted position. The latch link is operably connected to the cam device, with the cam device being in the second disengagement position when the latch link is in the retracted position, and in the first engagement position when the latch link is in the extended position.
Another aspect of the present invention is a latch mechanism that is adapted to engage a door strike to releasably secure a door in a closed position. The latch mechanism includes a latch apparatus that Is configured to be pivotally displaced about a transverse latch axis between a first position and a second position. The latch apparatus is also adapted to abut the door strike when in the first position and to be disengaged from the door strike when in the second position. Further, the transverse latch axis is configured to generally extend in the direction of a width of the door.
Other aspects of the present invention will become apparent by consideration of the detailed description and accompanying drawings.
The foregoing summary, as well as the following detailed description of certain embodiments of the present invention, will be better understood when read in conjunction with the appended drawings. For the purpose of illustrating the invention, there is shown in the drawings, certain embodiments. It should be understood, however, that the present invention is not limited to the arrangements and instrumentalities shown in the attached drawings.
Certain terminology is used in the foregoing description for convenience and is not intended to be limiting. Words such as “upper,” “lower,” “top,” and “bottom” designate directions in the drawings to which reference is made. This terminology includes the words specifically noted above, derivatives thereof, and words of similar import. Additionally, the words “a” and “one” are defined as including one or more of the referenced item unless specifically noted. The phrase “at least one of” followed by a list of two or more items, such as “A, B or C,” means any individual one of A, B or C, as well as any combination thereof.
At least portions of the exit device 100 may be positioned within an interior region 116 of the door 102, such as, for example, in one or more cavities or channels in the door 102. For example, referencing
Operable displacement of the push bar 108 may provide forces that are translated by the exit device 100 into motion that is used to displace components of the top and bottom latch mechanisms 112, 128 from first, locked positions to second, unlocked positions, thereby allowing the door 102 to be displaced from a closed, locked position to an open, unlocked position. According to the illustrated embodiment, operation, such as operable depressing, of the push bar 108, may provide a pulling force in a first direction, such, as, for example, a pulling force generally along a horizontal axis (“X” axis in
Referencing
Referencing
The lower wall 166 of the latch apparatus 138 may extend from the second sidewall 178 of the latch apparatus 138 along at least a portion of the body portion 160 and/or the first upper wall 162 of the latch apparatus 138. As discussed below, the lower wall 166 may include a latch engagement surface 184 that is configured to abut against a cam surface of the cam device 140 when the latch mechanism 130 is in the first, locked position. Additionally, a portion of a bottom surface 186 of the body portion 160 and/or of the first upper wall 162 may be configured to provide a cavity 188 that is sized to receive at least a portion of a cam surface of the cam device 140 at least when the cam device 140 is pivotally displaced away from engagement with the engagement surface 184 of the latch apparatus 138.
The opposing first and second sidewalls 176, 178 of the body portion 160 of the latch apparatus 138 may be configured for the latch apparatus 138 to be pivotally connected to an adjacent sidewall 146 of the latch housing 134. For example, according to the illustrated embodiment, a pivot post(s) 192 may extend from the first and second sidewalls 176, 178 of the body portion 160. According to such embodiments, the pivot post(s) 192 may be configured to be received in apertures in the latch housing 134. Further, the latch apparatus 138 may be pivotally displaced using the pivot post(s) 192 about a latch axis 194 between at least a first, locked position and a second, unlocked position. Alternatively, as shown in
According to the illustrated embodiment, the latch axis 194 may be generally perpendicular to the central longitudinal axis 148 of the latch mechanism 130, and may, or may not, be offset from the central longitudinal axis 148. Moreover, the pivotal movement of the latch apparatus 138 is primarily in the “Y” direction (
According to the illustrated embodiment, the cam device 140 is pivotally displaced about pivot shafts 206a, 206b that extend from the front and rear sidewalls 198, 200 of the cam device 140 and into an aperture in an adjacent surface. For example, as shown in
When in the first, engaged position, at least a portion of the cam surface 190 of the cam device 140 abuts against at least a portion of the latch engagement surface 184 of the latch apparatus 138 so as to prohibit the latch apparatus 138 from being pivotally displaced about the latch axis 194 to the second, unlocked position. When the cam device 140 is pivotally displaced to the second, disengaged position, the cam surface 190 is positioned so that at least a portion of the cam surface 190 is within the cavity 188 of the latch apparatus 138 such that the cam surface 190 does not engage with the latch engagement surface 184. Moreover, when pivotally displaced to the second, disengaged position, the cam surface 190 is positioned so as to not interfere with, or otherwise impede, the latch apparatus 138 from being able to be pivotally displaced to the second, unlocked position.
As shown in at least
The latch link 142 further includes a guide member 238 that is configured to guide the linear displacement of the latch link 142 along the vertical axis (“Z” axis in
The latch link 142 may be biased to the extended position by a biasing element 248, such as, for example, a spring. In the illustrated embodiment, the biasing element 248 may be positioned between at least a portion of the extension arm 240 of the latch link 142 and an upper surface 245 of the projection member 244, as shown for example, in
Referencing
As shown in at least
When the door 102 is to be opened, the push bar 108 may be depressed, which may result in the center case 122 displacing the pull cable 222 so that the pull cable 222 exerts a pull force on the latch link 142 that overcomes the biasing force of the biasing element 248. Moreover, as the latch link 142 is operably connected to the pull cable 222, such as, for example, by the attachment portion 230, a pull force via the pull cable 222 may displace the lath link 142 from the extended position and generally toward the center case 122 to a retracted position. As the latch link 142 is displaced toward the retracted position, the guide member 238 may be displaced along the guide orifice 242. Further, as the latch link 142 is operably connected to the cam device 140 via the cam protrusion 212, the displacement of the latch link 142 by the pull force may cause the displacement of the cam protrusion 212. Displacement of the cam protrusion 212 causes the cam device 140 to be pivoted about the cam axis 204 from the first, engagement position, to the second, disengagement position.
As shown in
When the door 102 is to return to the closed position, the latch apparatus 138 may be pivotally displaced from the second, unlocked position to the first, locked position. For example, as the door 102 returns to the closed position, the second side 268 of the door strike 170 may engage an inner surface 174 of the second upper wall 164 of the cam device 140 in a manner in which the door strike 170 provides sufficient force for the latch apparatus 138 to be pivotally displaced about the latch axis 194 back to the first, locked position. With the latch apparatus 138 in the first, locked position, the lower wall 166 of the latch apparatus 138 is no longer positioned to prevent the cam device 140 from being pivotally displaced from the second, disengaged position to the first, engaged position. Thus, when the pull force from the pull cable 222 is released, the biasing element 248 may provide sufficient force for the latch link 142 to be displaced from the retracted position to the extended position. As the latch link 142 is displaced, the guide member 238 may be displaced through the guide orifice 242. Moreover, again, as the cam protrusion 212 is operably connected to the latch link, the displacement of the cam protrusion 212 with the latch link 142 causes the cam device 140 to be pivotally displaced along the cam axis 204 from the second, disengaged position to the first, engaged position, as shown in
Referencing
The body portion 306 of the latch apparatus 302 may further include a link aperture 308 that is configured to operably connect the latch apparatus 302 to the latch link 142. For example, the link aperture 308 may be configured to receive a pin that extends into an aperture 214 in the latch link 142, or may include a protrusion that extends from the latch link 142 and into the link aperture 308 of the latch apparatus 302. The displacement of the latch link 142 by the pulling force of a first pull cable, such as the upper pull cable 118, may displace the latch link 142 from the extended position to the retracted position. As the latch link 142 is displaced toward the retracted position, the operable connection between the latch link 142 an the latch apparatus 302 may cause the latch apparatus 302 to be pivotally displaced about the latch axis 304 from a first, locked position, to a second, unlocked position. When the pulling force on the latch link 142 is removed, the latch link 142 may again be displaced to the extended position, such as, for example, by the biasing element 248, wherein an abutment surface 310 of the latch apparatus 302 may engage an engagement portion 312 of an inner surface 314 of a door strike 316.
In the illustrated embodiment, at least a portion of the abutment surface 310 of the latch apparatus 302 and at least a portion of the engagement portion 312 of the inner surface 314 of the door strike 316 may be mating tapered surfaces. For example, as shown in
Additionally, referencing
The door strike 316 may also be configured to engage the abutment surface 310 at the lowest possible location without interfering with the ability to displace the latch apparatus 302 from the first, locked position and/or to not interfere with the ability to displace the door 102 from the closed position when the latch apparatus 302 is in the second, unlocked position. The relatively low positioning of the engagement between the engagement portion 312 of the door strike 316 with the abutment surface 310 of the latch apparatus 302 may reduce the torque on the latch apparatus 302, and thereby improve the load capacity of the latch apparatus 302.
The body portion 306 of the latch apparatus 302 may further include a cable connection member 338 that is configured to at least assist in holding another latch mechanism in an unlocked position. Moreover, the cable connection member 338 may be configured to provide a pull force for the second cable when the latch apparatus 302 is displaced to the second, unlocked position via a pulling force provided by a first pull cable 222. For example, according to embodiments in which the latch apparatus 302 is part of the top latch mechanism 110, the cable connection member 338 may be configured to at least assist in displacing, and/or holding, the bottom latch mechanism 112 in an unlocked position. Moreover, the cable connection member 338 may be configured to be operably connected to the lower pull cable 120 such that, when the latch apparatus 302 is displaced to the second, unlocked position via a pulling force provided by the upper pull cable 118, the cable connection member 338 is displaced to a position that causes a pulling force to be exerted on the bottom latch mechanism 112 that withdraws at least a component of the bottom latch mechanism 112 from a locked or extended position to a unlocked or retracted position.
According to the illustrated embodiment, the cable connection member 338 includes an extension body 340 that extends away from the body portion 306, and which includes a connection orifice 342 that may be operably connected to the second cable. Further, the cable connection member 338 is configured such that the connection between the cable connection member 338 and the second pull cable is in closer proximity to the adjacent edge of the door 102 when the latch apparatus 302 is in the second, unlocked position than when the latch apparatus 302 is in the first, locked position so that, latch apparatus 302 is in the second, unlocked position, a pulling force is exert on the second cable that is used to retract or unlock the other latch mechanism.
Referencing
According to the illustrated embodiment, the hold open mechanism 344 may include a first extension 346 and a second extension 348 that generally extend axially (“Y” direction in
The hold open mechanism 344 is configured to be axially displaced in the “Y” direction (
When the latch apparatus 302 is displaced to the second, unlocked position, the latch apparatus 302 may be pivotally displaced so that the retention surface 356 is positioned for engagement with, and/or the cavity 354 is positioned to receive placement of, the finger portion 352. Accordingly, the hold open mechanism 344 may then be axially displaced in the “Y” direction (
Various features and advantages of the present invention are set forth in the following claims. Additionally, changes and modifications to the described embodiments described herein will be apparent to those skilled in the an, and such changes and modifications can be made without departing from the spirit and scope of the present invention and without diminishing its intended advantages. While the present invention has been illustrated and described in detail in the drawings and foregoing description, the same is to be considered illustrative and not restrictive in character, it being understood that only selected embodiments have boon shown and described and that all changes, equivalents, and modifications that come within the scope of the inventions described herein or defined by the following claims are desired to be protected.
While the invention has been described with reference to certain embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
The present application is a continuation of U.S. application Ser. No. 14/791,752 filed Jul. 6, 2015 and issued as U.S. Pat. No. 10,415,271, which claims the benefit of U.S. Provisional Patent Application No. 62/020,802 filed Jul. 3, 2014, the contents of each application hereby incorporated by reference in their entirety. Embodiments of the present invention generally relate to a concealed latch assembly for exit devices. More specifically, embodiments of the present invention relate to latch assemblies that utilize pivotal displacement of one or more components of the latch assemblies along a transverse axis. Multi-point exit devices often provide a relatively high degree of strength due to the multiple latching points of the exit device. During operation, when a closed door is to be displaced to an open position, a push bar of the multi-point exit device is typically depressed so that the top and bottom latches or bolts are retracted from locked positions to unlocked positions. The latches or bolts are also often maintained in the retracted positions as the do or is displaced from the closed position so as to prevent the latches or bolts from dragging across an adjacent surface. For example, by retaining a linearly displaced bottom bolt in a retracted position, the bottom bolt may not be dragged across the floor as the door is displaced from, and subsequently returned to, the closed position. Some exit devices contain components that are concealed within an inner region or cavity of the door. Thus, the inner region or cavities for such systems are typically sized to accommodate not only the physical size of the concealed exit device components, but also to provide sufficient space for the operation, such as pivotal and/or linear displacement, of those concealed components within the door. Yet, the space requirements for such concealed components may adversely impact the strength of the door. Moreover, the relatively large size of the inner region or cavity that is often needed to accommodate the concealed components of the exit device may reduce the material thickness of at least the portion of door that is between the inner region or cavity and the adjacent exterior surface of the door. Additionally, such reductions in the material thickness of the door may be more problematic for doors that are constructed from certain types of materials, such as, for example, wood. In an effort to address such strength issues, certain types of doors are re-enforced with metal covers or casings, which are secured to exterior portions of the door that are adversely affected by the size of the inner region or cavity. Yet, such metal casings or covers may increase the cost of the door, as well as be detrimental to the ornamental appearance of the door.
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Number | Date | Country | |
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20200232257 A1 | Jul 2020 | US |
Number | Date | Country | |
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62020802 | Jul 2014 | US |
Number | Date | Country | |
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Parent | 14791752 | Jul 2015 | US |
Child | 16573576 | US |