The present invention relates to improvements in locks and tilt latches for slidable sash windows, and more particularly to improvements to an integral sash lock/tilt latch combination that furthermore includes a window vent stop capability.
Single hung and double hung sliding sash windows are commonly used today in the construction of residential and commercial buildings. Sash locks are typically mounted to the meeting rail of the bottom sash window to lock the sash or sashes, by preventing the lower sash (or both the lower and upper sashes for a double hung window), from being opened through sliding movement relative to the master window frame. Also, in order to assist in the cleaning of the exterior of these sliding sash windows, it is common for window manufacturers to incorporate a tilt latch device thereon that permits one end of the sliding sash window to be released from the track of the master window frame. This allows the sash window to be pivoted into the room, for easy access to the exterior surface of the glazing that is normally exposed to the exterior environment of the building.
The present invention seeks to provide improvements to such window hardware in the form of an integrated sash lock and tilt latch fastener for single hung or double hung windows.
It is an object of the invention to provide a sash lock to prevent relative sliding movement of one or both sliding sash windows that are slidable within a master window frame.
It is another object of the invention to provide a tilt latch to permit pivoting of a sliding sash window inwardly into the room in which the window is installed.
It is a further object of the invention to provide a combination sash lock and tilt latch that act cooperatively through the use of a single cam.
It is another object of the invention to provide a sash lock and tilt latch that may act cooperatively to furthermore limit the travel of a window to provide a vent opening that is too small to permit egress of a small child therefrom.
It is also an object of the invention to provide a sash lock that may be blindly coupled to a tilt latch device for cooperative interaction and actuation of the latch.
Further objects and advantages of the invention will become apparent from the following description and claims, and from the accompanying drawing figures.
An integral sash locking and tilt latching fastener for a sliding sash window may include a lock assembly that may be interconnected with a latch assembly.
The lock assembly may be mounted to the top of the meeting rail of the sash window. The lock assembly may include a housing and a cam pivotally mounted to the housing, being configured to pivot out from a cavity in the housing to releasably engage a keeper on the master window frame (or on a second sliding sash window) in a “lock” position, to lock the sash window (or windows) and prevent it from sliding and/or tilting. The lock assembly also includes a lever arm that may be pivotally mounted within the lock housing, and which may be configured for a portion thereof to extend beyond the mounting surface of the housing, and into the hollow of the meeting rail. The cam may have a graspable shaft portion that may protrude upwardly, out from an orifice in the sash lock housing, to permit actuation of the device (cam rotation) by a user. Alternatively, the device may have a separate handle member secured to the cam, where the handle may facilitate easy rotation and counter-rotation of the cam.
The latch assembly may be received through an opening on a side of the sash member. The latch assembly may include a housing, biasing means, and a latch member slidably disposed within the housing. The latch member is configured to receive the lever arm of the lock assembly, when positioned within the hollow meeting rail, for coupling therebetween. The housing, latch member, and biasing means are configured for the biasing means to normally bias the latch member, so that a portion of one end (i.e., a portion of its “tongue”) may protrude out from the housing, and out of the sash window frame.
With the cam releasably secured in the “lock” position (e.g., using a detent mechanism), the cam may prevent sliding of the sash window through its engagement with the keeper, the latch member is also in its fully extended position which would prevent tilting of the sash window. The sash window may be redundantly locked with respect to any sliding motion within the master window frame by a stop member, which may be secured in the track of the master window frame within which the sash member slides. A first step of the stop member may protrude a first distance into the track, and may thereat block sliding movement of the tongue of the latch member that is biased to protrude therein, to provide a secondary lock feature with respect to sliding of the window away from its closed position.
When actuation of the shaft/handle member causes the cam to rotate (e.g., 135 degrees from the lock position), it may move the cam from the extended lock position into a first retracted cam position—a position where the cam is disengaged from the keeper on the master window frame, and would no longer prevent the sash window from sliding. Rotation of the cam into the first retracted cam position may cause a portion thereof to contact a follower portion of the lever arm and thereby drive the lever arm to also rotate, which rotation may act to oppose the biasing of the latch member to actuate it a discrete amount, through the interconnection therebetween, to move the latch member into a corresponding first retracted latch member position. With the latch member in the first retracted latch member position, the end of its tongue may be positioned clear of the first step of the stop member, so that the sash window may slide away from its closed position. However, a second step on the stop member may protrude a second distance, being further into the track of the master frame, and may be positioned at a discrete height above the first step, which may nonetheless still block sliding movement of the latch member.
This may provide a vent stop feature that permits sliding of the sash window from its closed position but only up to small elevated position that may form an opening small enough to prevent accidental egress by a small child or ingress by an intruder, but which nonetheless provides ventilation. With the latch member in its first retracted position, a portion of its tongue remains engaged within the track of the master window frame, and thereat still serves to prevent tilting of the sash member out from the master window frame. Note that the detent mechanism may releasably secure the cam at the first retracted cam position, thereby also releasably securing the latch member at the first retracted latch member position, due to the interconnection therebetween.
When continued actuation of the shaft/handle member causes the cam to further rotate a discrete amount (e.g., an additional 25 degrees—being 160 degrees from the cam's lock position), to move from the first retracted position to a second retracted position, the cam may further drive the lever arm to correspondingly rotate a discrete amount, and thus move the latch member into a second retracted latch member position. With the latch member in the second retracted latch member position, the end of the tongue is then positioned clear of the second step of the stop member, so that the sliding movement of the sash window is no longer limited, and it may now slide anywhere between a fully closed position and a fully open position. However, the tongue nonetheless still remains engaged within the track of the master window frame, and thus still serves to prevent tilting of the sash member out from the master window frame.
When continued actuation of the shaft/handle member causes the cam to further rotate another discrete amount (e.g., an additional 20 degrees—being 180 degrees from the cam's lock position), to move from the second retracted position to a third retracted position, the cam further drive the lever arm to correspondingly rotate a discrete amount, and move the latch member into a third retracted latch member position. With the latch member in the third retracted latch member position, the end of the tongue is then disengaged from the track of the master window frame, and the sash window is free to be tilted out of the master window frame. Note that the detent mechanism may also releasably secure the cam at the second and third retracted cam position, thereby also releasably securing the latch member at the third retracted latch member position.
Both a left-hand and right-hand version of the above described integral sash locking and tilt latching fastener and corresponding stepped stop may be mounted on a sliding sash window and master frame. Alternatively, only the left-hand or the right hand arrangement may be used to secure the window as described. The following discussion proceeds with a discussion of one version of the fastener, with the understanding that a mirror image may also be formed and used on the window.
The integrated sash lock/tilt latch fastener of
Perspective views of the housing 10 of the sash lock assembly 100 are shown in
Extending outwardly from the interior surface 14 of the housing 10 may be at least one hollow cylindrical protrusion that may be used to secure the sash lock assembly 100 to the sash window. In one embodiment of the housing, two hollow cylindrical protrusions 15 and 16 are used, and each may be configured to respectively receive a screw for mounting of the sash lock 100 to the meeting rail of the sliding sash window.
Extending outwardly from the interior surface 14 of the housing 10 may also be a shaft 25, which may be used for pivotal mounting of a lever arm.
The housing 10 may have a cylindrical boss 18 extending upwardly from the outer surface 13, and may also have a cylindrical boss 19 extending downwardly from the interior surface 14, into the housing cavity. The housing may have a hole 20 through the cylindrical boss 18 and boss 19. The hole 20 may be used for pivotal mounting of a shaft that may extend from a portion of the locking cam, or alternatively, the hole 20 may be used for pivotal mounting of a separate shaft/handle member, to which the locking cam may instead be fixedly secured.
As seen in
The locking cam 50, illustrated in
Protruding away from the hub 53 may be a cylindrical member 57, the axis of which may be generally concentric with the axis of the hub. The cylindrical member 57 may have a first flat 58A formed thereon, and a second flat 58B formed thereon to be clocked 180 degrees away from the first flat 58A. The flats 58A and 58B may co-act with respect to the leaf spring 90 shown in
The cylindrical member 57A may also have a third flat 59A formed thereon, as seen in
As seen for the alternate embodiment of the cam in
Interaction between the sash lock assembly 100, once installed upon the meeting rail of the sliding sash window, and the latch assembly 200, may be through the use of a lever arm 70 that may be pivotally mounted within the cavity of the housing 10. The lever arm 70 is shown within
Initial assembly of sash lock assembly 100 is shown in
As seen in
Next, as seen in
The clocking of the flat 58A and flat 58B on the cylindrical member 57 on the hub 53 of locking cam 50 may respectively contact and be flush with the leaf springs 90 and 90′, to releasably restrain the locking cam 50 from rotating out of the extended locking position and the third retracted unlock position, without being deliberately moved therefrom.
Also, the clocking of the flat 59A and flat 59B of the cylindrical member 57 on the hub 53 of locking cam 50 may be respectively engaged by the flexible leaf springs 90 and 90′ when the cam is at the first retracted (unlocked) position. (Note, to increase flexibility of the leaf springs 90 and 90′, only one end of each spring may be fixedly mounted in the housing, or alternatively, both ends may be slidably mounted therein, to easily permit lateral deflection of the leaf springs, but without permitting them to become loosened or disconnected from proper positioning within the housing adjacent to the locking cam). This contact of the flats of the cam with the leaf spring may serve to releasably restrain the locking cam 50 from rotating out of the first retracted (unlocked) position, until being deliberately moved therefrom. Note that since the angle at which the flats 58A/58B were clocked from the flats 59A/59B was approximately 135 degrees, the shaft/handle 40 will need to rotate approximately 135 degrees to actuate the sash lock assembly 100 from the extended lock position to the first retracted (unlock) position. This is shown by the movement of the handle portion 46 of the shaft/handle 40 in both figures. As noted above, angular displacements other than 135 degrees are also possible, as long as the rotational movement is sufficient to move the curved wall 56 of cam 50 far enough away from the keeper to permit sliding movement of the sash window, and although it may be desirable, the cam need not even be fully retracted within the housing 10 at the first retraced unlock position.
The shaft/handle 40 and cam 50 may also be releasably secured at the second retracted (unlocked) position using the same detent mechanism, where the leaf springs 90 and 90′ engage the flats 59C and 59D on the hub 53 of locking cam 50, where those flats may be utilized.
The shaft/handle 40 and cam 50 may furthermore be releasably secured at the third retracted position using the same detent mechanism, where the leaf springs 90 and 90′ once again engage the flats 58A and 58B (i.e., after having been rotation 180 degrees).
The above noted interconnection between the sash lock assembly 100 and the latch assembly 200 may be through the use of the following latch assembly configuration.
The latch assembly 200 may include a latch housing 210, shown in
Perspective views of the latch member 250 are shown in
The generally slender beam 255 may transition and widen to form peripheral walls about an opening 275A, the size of which may depend upon the cross-sectional shape of the post 76 of lever arm 70 of the lock assembly 100, to provide for engagement of the post with the latch assembly. The opening 275A may be an elongated shape, which may, for example, be generally rectangular-shaped, as shown in
Extending away from the far end of the peripheral walls formed about opening 275A may be a secondary beam 255A that may be formed substantially the same as beam 255, and the distal end of which may similarly widen to form peripheral walls about an opening 275B that may be constructed the same as opening 275A. The connection of the beam 255A with the peripheral walls about opening 275A may include a first notch 255N1 on a first side of the beam and a second notch 255N1 on a second side of the beam, to produce an area that may be weakened. The weakened area may be used to sever the secondary beam 255A from the peripheral walls associated with beam 255, where it is necessary to use the first opening 275A for receiving the post 76 of the lever arm 70 of the sash lock 100, with respect to mounting upon a meeting mail of a window of a particular size. A third beam 255B with peripheral walls about an opening 275C may be similarly formed. An additional pair of notches (255BN1 and 255BN2) may be formed in its central region, to permit severing of the most distal portion of the beam, being just beyond the cylindrical protrusion 255P2.
Biasing of the slidable latch member 250 relative to the housing 210 may be through the use of a suitably arranged tension spring, or by using a compression spring. To simplify the presentation, the figures herein only depict an embodiment where a compression spring is utilized.
Assembly of the helical compression spring 291 and the latch member 250 into the housing 210 is illustrated initially in
A suitable keeper 400 is shown in
To accommodate installation of the latch assembly 200, the sash window frame 300, as illustrated in
To accommodate installation of the sash lock assembly 100, the top of the meeting rail 301 may have an elongated opening 312 formed therein, adjacent to which may be a first hole 313A, and a second opening 313B. The elongated opening 312 may be shaped and positioned to suitably provide clearance for the post 76 of the lever arm 70, and for its movement between the extended locking position (
The initial installation of the latch assembly 200 is shown in
One or more of the beams (255, 255A, and 255B) of the latch member may be formed to include a vertical protrusion. For example, beams 255 and 255B of the latch member 250A are formed to each include a respective vertical protrusion 255P1/255P2 that may protrude down from the bottom surface of the beam. The protrusions 255P1/255P2, which may be cylindrical, may be formed of a selective length so as to contact the bottom wall of the meeting rail 301A to provide support for the beam to be maintained at a substantially horizontal position, which may be a substantially central position within the hollow meeting rail of the sash window, or may be just a desired height above the bottom wall of the meeting rail. The protrusions 255P1/255P2 may also serve to prevent disengagement of the post 76 of the lever arm 70 from the opening.
The suitable opening (e.g., 275A, 275B, or 275C) on one of the beams (e.g., 255, 255A, or 255B) of the latch assembly 200 may be coordinated with and properly positioned for alignment below the top opening 312 in the meeting rail 301 of the window frame 300 (see
The initial installation of the sash lock assembly 100 upon the sash window frame 300 is also illustrated in the exploded view of
After insertion of the post 76 through the opening 312 in the top of the meeting rail 301 and into the rectangular opening 275B of the latch bean, the sash lock assembly 100 may then be rotated roughly 90 degrees, and then may be lowered for the bottom surface 11 of the sash housing to contact and be flush with the top of the meeting rail, and be fastened to the holes 313A and 313b therein, using fasteners through the hollow cylindrical protrusions 15 and 16 of the housing 10. The 90 degree rotation of the sash lock assembly 100 just prior to its mounting of the sash lock to the meeting rail may orient the long transverse direction of the post 76 of lever arm 70 to be parallel to the axial direction 301AX of the meeting rail 301A, so that it may be generally in-line with the shorter width 275W of the rectangular opening 275A in the latch member 250.
The width 275W of the rectangular opening 275A in the latch member 250 may be just slightly larger than the long transverse direction of the post 76 of the lever arm 70 positioned therein, so that movement of the post actuates the latch member of the latch assembly, to provide the interconnection therebetween. The protrusion 77 may redundantly serve to prevent disconnection of the post 76 of the lever arm from the opening 275B in the latch member (i.e., preventing the latch member from falling off of the post), in conjunction with the protrusions 255P1 and 255P2 that may serve to maintain the latch beam(s) (e.g., 255, 255A, and 255B) at the proper elevation within the meeting rail. For further information regarding this aspect of the installation, if required, a more detailed description and corresponding illustrations are provided within Applicant's co-pending application Ser. No. 14/278,226.
The sash lock assembly 100 and the latch assembly 200 are shown installed with respect to the sliding sash window 300, in
Once the outside of the glazing of the window 300 has been cleaned, the window may be pivoted back into the master window frame 450, and the shaft/handle member may be moved back into the second retracted position, where it may be biased back into the first retracted unlock position, or the user may simply move the shaft/handle member 40 to directly place the shaft/handle member 40 and can 50 in the first retracted unlock position (see e.g.,
As seen in
The contact therebetween may create a horizontal force component FC in the latch member 250, which may oppose the basing of the latch member and the retaining three of the detent mechanism, and may be transmitted to the post 76 of the lever arm 70 by the interconnection with the latch member, which may drive the cam 50 to counter-rotate a small amount. Since the tongue 253 of the latch member 250 only needs to retract a small amount to clear the second step 432 of the stop 430 for the sash window 300 to be lowered, the cam will not be driven to counter-rotate vary far from the first retracted unlock position. Thus, once the tongue 253 is below the second step 432 of the stop 430, the biasing of the latch member 250 by spring 291 may automatically move the cam 50 back into the first retracted unlock position, and similarly move the latch member 250 into its first retracted unlock position (e.g.,
The examples and descriptions provided merely illustrate preferred embodiments of the present invention. Those skilled in the art and having the benefit of the present disclosure will appreciate that further embodiments may be implemented with various changes within the scope of the present invention. Other modifications, substitutions, omissions and changes may be made in the design, size, materials used or proportions, operating conditions, assembly sequence, or arrangement or positioning of elements and members of the preferred embodiment without departing from the spirit of this invention.
This application is a continuation-in-part of U.S. application Ser. No. 14/879,436, having the title “Impact-Resistant Lock and Tilt Latch Combination for a Sliding Sash Window,” and U.S. application Ser. No. 14/879,164, having the title “Integrated Sash Lock and Tilt Latch Combination Using One Lock for Two Tilt Latches.” each of which were filed on Oct. 9, 2015, and which are a continuation-in-part of U.S. patent application Ser. No. 14/566,908, filed on Dec. 11, 2014, having the title “Integrated Sash Lock and Tilt Latch Combination with Improved Wind-Force-Resistance Capability,” which is a continuation-in-part of U.S. patent application Ser. No. 14/278,226, filed on May 15, 2014, having the title “Integrated Sash Lock and Tilt Latch Combination with Improved Interconnection Capability Therebetween,” which is a continuation-in-part of U.S. patent application Ser. No. 14/198,986, filed on Mar. 6, 2014, having the title “Integrated Sash Lock and Tilt Latch with Screwless Installation and Removal from Meeting Rail,” with the disclosures of each being incorporated herein by reference.
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Number | Date | Country | |
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20160069108 A1 | Mar 2016 | US |
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