The present invention relates generally to window latches. More particularly, the present invention relates to a window latch that may be used to limit the degree to which one sash of a window may be moved with regard to a second sash, while also providing a recess by which the associated sash may be grasped thereby and moved relative to the second sash.
Double-hung windows are commonly used in residential and other structures. Double-hung window assemblies typically include a window frame and a pair of window sashes. The bottom sash may be positioned inwardly of the top sash so that the sashes overlap and can be slid vertically relative to one another along the guide rails of the window frame. Window sashes can be made of wood, extruded plastic frame members or metal frame members joined at the corners, for example, to form a generally rectangular frame in which the glazing is installed.
Double-hung windows often include a locking mechanism located at the point where the sashes meet when the window assembly is in a closed position. A latch mechanism may be fixed on the header of the bottom sash and the corresponding latch-receiving mechanism is fixed on the sill of the top sash. When the window sashes are in the closed position, the lock may be secured to prevent any movement of the sashes.
Many double-hung windows also include latches (including, for example, vent latches) that are typically mounted on the inside surface of the top sash. The latches generally are manually activated to extend from a flush position to an extended position in which the latches project outwardly over the top rail of the bottom sash. When in the flush position, the sashes may be slid relative to each other over the full range of the window frame. In the extended position, the latches allow the sashes to be slid relative to each other to limit the amount of travel of the sashes, and thus provide a ventilation opening at the top or bottom of the window frame. As well, hand grip recesses are often provided at or near the upper member of the top sash to facilitate its movement. Because the hand grips and latches on existing windows are separate components, individual mounting apertures must be provided for each component in the window sash.
The present invention recognizes and addresses considerations of prior art constructions and methods. In one embodiment of the present invention, a latch for use in a window having a top sash and a bottom sash slidably mounted in a window frame includes a housing having a faceplate, a pair of opposed sidewalls, each sidewall defining a pawl mounting recess, a bottom wall extending between the sidewalls, an aperture defined by the faceplate that opens into a first cavity defined by the housing, and a pair of mounting arms disposed within the first cavity. Each mounting arm has a proximal end adjacent the bottom wall and a distal end extending both toward the face plate and inwardly toward a longitudinal center plane of the housing, the mounting arms being disposed on opposing sides of the first cavity. A pawl is pivotably received in the first recess, the pawl including a top surface, an engagement surface, and a pair of mounting pins disposed on opposing sides of the pawl. Each mounting pin is pivotally received in one of the pawl mounting recesses. The distal ends of the mounting arms engage the pawl adjacent a respective mounting pin such that the mounting pins are pivotably secured in the pawl mounting recesses as the pawl is pivoted between a first position in which the top surface is coplanar with the faceplate and a second position in which the pawl extends beyond the faceplate such that the engagement surface is transverse to the faceplate.
Another embodiment of the latch for use in a window having a top sash and a bottom sash slidably mounted in a window frame includes a housing including a faceplate, a pair of opposed sidewalls, each sidewall defining a pawl mounting recess, a bottom wall extending between the sidewalls, an aperture defined by the faceplate that opens into a first cavity defined by the housing, and a first retention arm disposed within the first cavity. The first retention arm has a proximal end adjacent the bottom wall and a distal end extending both toward the face plate and inwardly toward a longitudinal center plane of the housing. A pawl is pivotably received in the first recess, the pawl including a top surface, a bottom surface, an engagement surface, a first retention recess formed on a side of the pawl, and a pair of mounting pins disposed on opposing sides of the pawl, each mounting pin being pivotally received in one of the pawl mounting recesses. The pawl is selectively pivotable between a first position in which the top surface is coplanar with the faceplate and a second position in which the pawl extends beyond the faceplate such that the engagement surface is transverse to the faceplate. The distal end of the first retention arm is configured to engage the first retention recess to maintain the pawl in the first position and to engage the bottom surface of the pawl to maintain the pawl in the second position.
Yet another embodiment of the latch for use in a window having a top sash and a bottom sash slidably mounted in a window frame includes a housing including a faceplate, a pair of opposed sidewalls, a bottom wall extending between the sidewalls, a pair of opposed end walls, a center wall disposed between the end walls such that a first cavity is defined between the center wall and a first of the end walls and a second cavity is disposed between the center wall and a second of the end walls, and an aperture defined by the faceplate that opens into the first and second cavities. A pawl is pivotably received in the first recess, the pawl including a top surface and an engagement surface. The pawl is pivotable between a first position in which the top surface is coplanar with the faceplate and a second position in which the pawl extends beyond the faceplate such that the engagement surface is transverse to the faceplate. The second cavity is configured such that a user can grasp the window vent latch by the second cavity and move the respective sash within the window frame.
Yet another embodiment of the present invention is a method of making a latch for use in a window having a top sash and a bottom sash slidably mounted in a window frame. The method includes providing a housing having a faceplate, a pair of opposed sidewalls, each sidewall defining a pawl mounting recess, a bottom wall extending between the sidewalls, an aperture defined by the faceplate that opens into a first cavity defined by the housing, and a pair of mounting arms disposed within the first cavity. Each mounting arm includes a proximal end adjacent the bottom wall and a distal end extending both toward the face plate and inwardly toward a longitudinal center plane of the housing, the mounting arms being disposed on opposing sides of the first cavity. A pawl is provided that is pivotably received in the first recess, the pawl including a top surface, an engagement surface, and a pair of mounting pins disposed on opposing sides of the pawl, each mounting pin being pivotally received in one of the pawl mounting recesses, the distal ends of the mounting arms engaging the pawl adjacent a respective mounting pin such that the mounting pins are pivotably secured in the pawl mounting recesses. The pawl is configured to pivot between a first position in which the top surface is coplanar with the faceplate and a second position in which the pawl extends beyond the faceplate such that the engagement surface is transverse to the faceplate.
Yet another embodiment of the latch for use in a window having a top sash and a bottom sash slidably mounted in a window frame includes a housing having a faceplate, a pair of opposed sidewalls, a bottom wall extending between the sidewalls, and an aperture defined by the faceplate that opens into a first cavity defined by the housing. A pawl is pivotably received in the first recess, the pawl having a top surface, a bottom surface, an engagement surface, and a first retention recess formed on a side of the pawl. The pawl is selectively pivotable between a first position in which the top surface is coplanar with the faceplate and a second position in which the pawl extends beyond the faceplate such that the engagement surface is transverse to the faceplate. Means for pivotably mounting the pawl to the housing and means for selectively retaining the pawl in one of the first position and the second position are included.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate one or more embodiments of the invention and, together with the description, serve to explain the principles of the invention.
A full and enabling disclosure of the present invention, including the best mode thereof, directed to one of ordinary skill in the art, is set forth in the specification, which makes reference to the appended drawings, in which:
Repeat use of reference characters in the present specification and drawings is intended to represent same or analogous features or elements of the invention according to the disclosure.
Reference will now be made in detail to presently preferred embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided by way of explanation, not limitation, of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope and spirit thereof. For instance, features illustrated or described as part of one embodiment may be used on another embodiment to yield a still further embodiment. Thus, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims and their equivalents.
Referring now to
Referring to
Referring additionally to
As best seen in
A pair of opposed retention arms 144 extend upwardly from bottom wall 122 toward faceplate 114 of housing 110. Each retention arm 144 includes a proximal end adjacent bottom wall 122 and a distal end 148 depending upwardly toward faceplate 114. As well, each distal end 148 depends inwardly toward center plane 141 such that the distal end of each retention arm 144 is closer to center plane 141 than is the respective proximal end of each retention arm 144. Further, the distal end of each retention arm 144 forms a catch for selectively engaging pawl 112, as discussed below.
Housing 110 preferably includes a pair of arms extending both outwardly from an outer surface of the housing and upwardly toward faceplate 114. The distal ends of arms 172 are spaced from faceplate 114 such that a portion of a window sash is receivable therebetween, such that window latch 100 can be mounted to a correspondingly shaped aperture formed in a window sash (
Referring to
To assemble pawl 112 and housing 110 of the preferred embodiment shown in
As shown in
To place pawl 112 in the second position in which pawl 112 extends outwardly beyond faceplate 114 of housing 110, a user pushes inwardly on actuation tab 160. Upon exertion of adequate force, cam surfaces 165 cause catches 148 on the distal ends of retention arms 144 to be urged outwardly, thereby allowing pawl 112 to pivot about mounting pins 158. As pawl 112 is pivoted, each catch 148 rides along a respective track 164 and eventually engages a respective notch 166 formed on bottom surface 154 of pawl 112. Pivotal motion of pawl 112 is limited by engagement of actuation tab 160 with stop surface 126 on center wall 124. When in the second position, engagement surface 156 of pawl 112 is transverse to faceplate 114 of housing. As such, sliding motion of top sash 104 and bottom sash 106 relative to each other is limited by engagement of engagement surface 156 with the upper portion of bottom sash 106. As well, further pivotal motion of pawl 112 relative to housing 110 is prevented by the abutment of actuation tab 160 with stop surface 126.
To return pawl 112 to the first position shown in
While one or more preferred embodiments of the invention are described above, it should be appreciated by those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope and spirit thereof. For example, the window latch may be installed in a frame of a window that only has one slidable sash such that motion of the sash relative to the frame may be limited thereby. As well, the window latch be installed in the sash of a window in which the sashes are slid in a horizontally rather than vertically. It is intended that the present invention cover such modifications and variations as come within the scope and spirit of the appended claims and their equivalents.
This application claims priority to U.S. Provisional Patent Application No. 60/971,142, filed on Sep. 10, 2007, entitled “Window Latch,” the entire disclosure of which is incorporated by reference herein
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