Abstract: A sash includes a stile, the stile defining a first flange and a second flange, a locking slot defined extending through the first flange; and a sash guide, the sash guide defining a first guide leg and a second guide leg, the first guide leg defining a locking tab, the locking tab extending through the locking slot.

Abstract: An exemplary tilt latch mechanism including a latch bolt configured to rotate about a bolt axis to locate a portion of the latch bolt adjacent a portion of a latch, or jamb, channel for support is described herein. The latch bolt may include a foot portion configured to, e.g., distribute forces within the latch channel.

Abstract: A sheath for a window vent latch having a housing defining a slot sized to allow a vent latch to fit therein, and a spring attached to the housing for engaging the inside of a conventional window jamb. A method of seating a window vent latch in a window frame including the steps of providing a vent latch in a vent latch sheath having a housing and a spring, a window with a window frame having a window jamb, placing the vent latch sheath in the window jamb while allowing the spring to engage the window jamb, and adjusting the vent latch housing along the window jamb.

Abstract: A sheath for a window vent latch having a housing defining a slot sized to allow a vent latch to fit therein, and a spring attached to the housing for engaging the inside of a conventional window jamb. A method of seating a window vent latch in a window frame including the steps of providing a vent latch in a vent latch sheath having a housing and a spring, a window with a window frame having a window jamb, placing the vent latch sheath in the window jamb while allowing the spring to engage the window jamb, and adjusting the vent latch housing along the window jamb.

Abstract: A tilt latch system that comprises an actuator movable from a first position to a second position; a lock-out member movable from a retracted position to an extended position upon movement of the actuator from the first position to the second position; and an engagement member movable from an engaged position to a disengaged position upon movement of the actuator from the first position to the second position is provided. The actuator and the engagement member are maintained in the second and disengaged positions, respectively, when the lock-out member is in the extended position. The actuator and the engagement member are automatically biased to the first position and the engaged position, respectively, upon movement of the lock-out member from the extended to the retracted position. The tilt latch system may further comprise a lock- out device and/or be optionally utilized in a modular configuration.

Abstract: A tilt latch system that comprises an actuator movable from a first position to a second position; a lock-out member movable from a retracted position to an extended position upon movement of the actuator from the first position to the second position; and an engagement member movable from an engaged position to a disengaged position upon movement of the actuator from the first position to the second position is provided. The actuator and the engagement member are maintained in the second and disengaged positions, respectively, when the lock-out member is in the extended position. The actuator and the engagement member are automatically biased to the first position and the engaged position, respectively, upon movement of the lock-out member from the extended to the retracted position. The tilt latch system may further comprise a lock-out device and/or be optionally utilized in a modular configuration.

Abstract: A window sash installed into a window frame, wherein the window sash assumes an operable position where the vertical sides of the window sash are aligned with the side jambs of the window frame. A gap space exists between each of the vertical sides of the window sash and the side jambs of the window frame. This gap space is utilized by a counterbalance system. Spacer assemblies are attached to the window sash. Each spacer assembly has a base that mounts to the window sash and a slide that selectively extends from the base. The slides are extended across the gap spaces between the sash and the side jambs. The slides are brought into close proximity with the side jambs. The presence of the slides prevents the window sash from being able to cock out of the intended operational orientation of the window sash.

Abstract: A single or double hung window assembly has a rectangular main frame supporting at least one rectangular sash frame for vertical sliding movement, and each frame has members formed from extrusions including rigid plastics material. A horizontal upper sash rail or member is reinforced by an elongated and continuous metal stiffening channel having a width substantially greater than its height and defining a longitudinally extending and upwardly facing undercut cavity. End portions of the stiffening channel support retractable sliding tilt latch bolts each having a snap-fit connection to a corresponding actuator slidably mounted on the upper sash rail. A sash lock member is also mounted on the upper sash rail and is secured to the stiffening channel. A pre-assembly of the stiffening channel and latch bolts is inserted through an opening in a vertical sash frame member, and stiffening channels are also inserted into other sash frame members.

Abstract: A wall panel system includes a sliding wall panel assembly that includes a pivot lock for converting the wall panel assembly between a sliding configuration and a pivoting configuration. The pivot lock includes a first lock member that is configured to selectively prevent translation of the wall panel assembly along a track and a second lock member that is configured to selectively prevent pivoting of at least a portion of the wall panel assembly relative to the track.

Abstract: A sash window assembly includes: a window frame having upper, lower, and left and right vertical frame members; and at least one sash guided by the vertical frame members and supported to be openable and closable by being slid vertically. The sash has: latch devices provided respectively at left and right ends in an upper end portion of the sash; an upper frame element having first passage holes formed in a top surface thereof and through which respective operating members of the respective latch devices are exposed toward an indoor space; a lower frame element; left and right vertical frame elements, each having a second passage hole formed in a depth-direction surface of the vertical frame element and through which a fastening section of the latch device is passed; and a face material provided inside the upper, lower, and left and right vertical frame elements.

Abstract: A window assembly includes a main outer support frame supporting at least one movable rectangular sash frame enclosing an insulated glass panel. The sash frame is supported for vertical or horizontal movement between open and closed positions, and an interlocking system is effective to lock adjacent overlapping sash frame members. The interlocking system includes an angular metal clip member mounted on one sash frame member and having a flange projecting into a slot within the adjacent sash frame member. A pair of clip members are located under the tilt latches on single and double hung window assemblies and are secured to a vertical sash frame member on a horizontal sliding window assembly. The interlocking system responds to a substantial positive or negative wind load or such a wind load after an impact which breaks a glass panel, to limit deflection and prevent permanent deformation or release of the movable sash frame.

Abstract: A locking handle which is in particular provided for a motor vehicle comprises a star handle which is rotatably supported around an axle and to which one or more locking rods are fastened. An improved locking handle of this type comprises a longitudinally displaceably guided slide actuator with an actuator part. An engagement part is provided at the star handle.

Abstract: A window sash assembly includes a window sash having an upper rail and at least one side rail that form a corner of the window sash. A slot at the window sash corner opens laterally outwardly from the corner and is defined in part by opposed linear tracks on the upper rail. A tilt latch is disposed in the slot, and includes a housing having opposed sidewalls and outwardly extending ledges overlying the sidewalls slidably received over the tracks on the upper rail. A flexible resilient spring element on each sidewall is spaced from the associated ledge such that the tracks on the rails are slidably received between the ledges and the spring elements.

Abstract: A snubber for a window unit. The snubber includes a frame mount for securing to the frame of the window unit and a sash mount for securing to the sash of the window unit, proximate the frame mount. The frame mount and the sash mount have cooperating shapes for abutting against each other upon the window unit being closed and upon pressure being applied to the sash. The frame mount and the sash mount can be secured to the window unit on easily accessible parts of the window unit.

Abstract: A latch mechanism for a window includes a main housing, a bolt, and a spring. The bolt is substantially located within the housing and is biased by the spring into an extended position. In the extended position, an end of the bolt extends into a side jamb of a frame of the window. The end of the bolt has a protrusion which projects in the direction of travel of a window sash within the window frame and is engageable with a pocket brace located in the side jamb.

Abstract: A double-hung window having a uniform interior wood appearance is disclosed. The window has a head jamb and side jambs. The window has an upper and lower sash, each having a wood frame. The upper and lower sashes are held in the window by the side jambs. Lock-pins are extendable from each side of the lower sash. A concealed jamb liner cover for selective engagement with each upper side jamb is provided which has an exposed wood surface and a channel for receiving the lock-pin of the lower sash. An upper sash lock housing attached to an upper portion of the wood frame of the upper sash, is provided which holds an upper sash lock-pin for each side of the upper sash. A wooden interior upper parting stop connected to the head jamb conceals the upper sash lock housing when the window is closed.

Abstract: A latching system for a double-hung window including upper latches and anti-bow latches where the upper latches and the anti-bow latches are operated by a common activating mechanism for ease of use of the window. A single activating mechanism may be utilized for latches on both sides of a window, or separate activating mechanisms may be used for each side of the window.

Abstract: A tilt latch and pivot housing which has a collapsible retainer on each of its side walls extending along a substantial portion of the length thereof and angularly outwardly from the side walls of the housing. The inner surface of each retainer is spaced from the surface of the adjacent side wall of the housing, thus forming a crevice or gap designed to receive the retainer when sufficient pressure is applied to the retainer's outer surface causing the retainer to deflect inwardly. According to some embodiments, portions of the retainers adjacent to the upper engagement ends therof are beveled. The retainers may also be beveled on one end to facilitate installation of the housing into a sash. The housing may also include a collapsible retainer formed at the bottom wall of the housing for preventing longitudinal movement of the housing after installation. The present invention is also directed to methods of manufacturing sash windows having tilt latches and/or pivots incorporating the housings.

Abstract: A latch mechanism, which is coupled to a window sash that travels within a window frame, is adapted for being coupled to a pocket brace, which extends across the channel opening of the jamb pocket of the side jamb. The latch mechanism includes a main housing, a bolt, and a tension device. The main housing has a sidewall, which includes one or more sidewall sections which extends around at least a portion of the housing and defines an interior space, and has an opening in said sidewall at one end of said housing. The sidewall forms a channel within the interior space of the main housing having an end that coincides with said opening. The bolt is substantially located within the housing and travels along the channel, and has a first end which is adapted for extending through the opening of the housing and extending into the side jamb of a window frame. A first end of the bolt has a protrusion, which projects in the direction of travel of the window sash within the window frame.

Abstract: Structure for maintaining a sliding window sash at an intended position with respect to a frame within which the sash moves. The structure serves to retain the sash at a position along an axis generally perpendicular to a plane defined by the window frame. An inwardly facing surface of the frame has formed therein an elongated trough which extends generally parallel to a direction of intended sliding movement of the sash. A blade is mounted within a cavity in the sash and disposed for pivotal movement between a first position, wherein the blade is retracted within an outwardly facing surface of the sash, and a second position, wherein the blade is extended through the outwardly facing surface of the sash into the trough defined within the inwardly facing surface of the frame. The blade is normally biased to the second position, but it can volitionally be retracted to the first position to enable tilting inward or removal of the sash from the window frame.

Abstract: Housing for installation in a window frame having a window sash with a notch defining a pair of opposed edges. Each housing includes side walls and a top wall extending beyond the side walls to define a flange. Each housing further includes protuberances, such as triangular protuberances, projecting from the side walls. Each protuberance is spaced from the flange to define respective gaps for receiving opposed edges therein.

Abstract: Disclosed are apparatus for a snap lock balance shoe and system to be incorporated in pivotable double hung windows. In one embodiment, the snap lock balance shoe includes a pair of retractable tabs that partially extend through openings within an inverted window balance.

Abstract: A tilt latch and pivot housing is disclosed, which has a collapsible retainer on each of its side walls extending along a substantial portion of the length thereof and angularly outwardly from the side walls of the housing. The inner surface of each retainer is spaced from the surface of the adjacent wall of the housing, thus forming a crevice or gap designed to receive the retainer when sufficient pressure is applied to the retainer's outer surface causing the retainer to deflect inwardly. According to some embodiments, portions of the retainers adjacent to the upper engagement ends are beveled. The retainers may also be beveled on one end to facilitate installation of the housing into a sash. The housing of the present invention may also include a collapsible retainer formed at the bottom wall of the housing for preventing longitudinal movement of the housing after installation.

Abstract: A tilt-latch (10) for a sash window (12) disposed within opposed guide rails (16) on a master frame (14) is provided. The sash window (12) comprises a top rail (18), a base (22) and two stiles (24, 26) connected together at their extremities. The tilt-latch (10) is adapted for releaseably securing the sash window (12) to the master frame (14). The tilt-latch (10) includes a housing (30) adapted to be supported by the top rail (18), the housing (30) having an outward end opening (54). The tilt-latch (10) further includes a latch bolt (32) disposed within the housing (30) and having a nose (56) adapted for engaging a respective one of the guide rails (16). The latch bolt (32) has structure wherein the latch bolt (32) is capable of being operably positioned in the housing (30) in one of a first position for a right-hand tilt-latch (10) and second position for a left-hand tilt-latch (10).

Abstract: An invertably mountable device having a generally hollow housing which mounts a movable latch member that is preferably biased toward latching engagement with an adjacent window jamb liner by a spring disposed within the housing. The housing preferably comprises a pair of mirror-image shells which fit together to form an enclosure, and provide an internal pivot mount for the latch member, and the housing has an opening through which the latch member projects. The latch member preferably carries a finger grip/thumb abutment member which facilitates movement of the latch member by an operator, and the grip/abutment member and latch member are preferably configured to permit mounting of the grip/abutment on either side of the latch member, to facilitate invertable mounting of the latch member. The latch member and jamb liner preferably provide a detent structure for secure interengagement.

Abstract: Plural protuberances are provided along each side of a tilt latch or pivot housing. The protuberances each form an edge that engage an edge of a notch in a window sash. The protuberances are provided with flexible fingers that are flexed or sheared by the sash edges to provide a snug fit.

Abstract: A window system comprises a frame having a top, a bottom and two sides, at least one slidable and tiltable sash disposed within the frame, and a locking device attached to each side of the sash. The locking device is pivotable between an unlocked position to permit tilting of the sash, and a locked position which locks the sash to the frame. In the locked position, the locking device prevents any air from infiltrating between the sides of the sash and the frame.

Abstract: Structure for maintaining a sliding window sash at an intended position with respect to a frame within which the sash moves. The invention serves to retain the sash at a position along an axis generally perpendicular to a plane defined by the window frame. An inwardly facing surface of the frame has formed therein an elongated trough which extends generally parallel to a direction of intended sliding movement of the sash. A blade is mounted within a cavity in the sash and disposed for pivotal movement between a first position, wherein the blade is retracted within an outwardly facing surface of the sash, and a second position, wherein the blade is extended through the outwardly facing surface of the sash into the trough defined within the inwardly facing surface of the frame. The blade is normally biased to the second position, but it can volitionally be retracted to the first position to enable tilting inward or removal of the sash from the window frame.

Abstract: A window system comprises a frame having a top, a bottom and two sides, at least one slidable and tiltable sash disposed within the frame, and a locking device attached to each side of the sash. The locking device is pivotable between an unlocked position to permit tilting of the sash, and a locked position which locks the sash to the frame. In the locked position, the locking device prevents any air from infiltrating between the sides of the sash and the frame.

Abstract: The present invention is directed to an improved vent stop for use in a sliding sash window assembly or a sliding door assembly. The vent stop has a housing adapted to be disposed in the recess. This housing includes a cavity with a bottom plate therein. Inside the cavity is a tumbler that may be in a retracted position and an extended position. When the tumbler is in an extended position the tumbler has a protruding apex at the top. The tumbler has at least one pivot means for pivotally securing said tumbler to said housing for movement between the extended position and the retracted position. In the extended position the bottom of the tumbler overlies a portion of the second sash to prevent movement of the lower sash past the tumbler. When in a retracted position within said cavity the sash or door can be raised and/or moved past the tumbler without interference. Also within the housing is a spring means for biasing said tumbler into said extended position.

Abstract: Plural protuberances are provided along each side of a tilt latch or pivot housing. The protuberances each form an edge that engage an edge of a notch in a window sash. The protuberances are provided with flexible fingers that are flexed or sheared by the sash edges to provide a snug fit.

Abstract: A window assembly includes a housing and a winder rotatably connected to the housing, where the winder includes a slot. The housing is mounted on a window sash. A flexible filament is disposed within the slot and is operative with the winder to withdraw window sash latches from a window frame so that the window sash can be removed from the frame.

Abstract: A latch assembly for double hung windows also permits each of the sashes to be tilted inwardly with respect to the window frame assembly. The window latch assembly includes a keeper which is recessed within a lower rail of the upper window sash, and a latch which is recessed in the upper rail of the lower window sash and positioned such that the latch and the keeper are selectively engaged upon rotation of a sweeper cam. The sweeper cam also engages a slide translatable between a first position engaging one of the side rails of the window frame assembly, and a second position, retracted within the lower window sash and release the upper edge of the window sash from the window frame assembly.

Abstract: A window stop (10) for limiting movement of a sliding window along a predetermined path of window movement is provided. The window stop (10) has a housing (12) having a cavity (20) wherein the housing (12) is adapted to be positioned adjacent the path of window movement. A bolt (14), operatively associated with the cavity (20), is moveable between a first position (BP1) within the housing (12) and thereby out of the path of window movement, and a second position (BP2) extending out of the housing (12) into the path of the window movement whereby the window is able to contact the bolt (14). A securing means (16) exerts a force generally perpendicular to the longitudinal axis of the housing and on the bolt (14) to retain the bolt at the first position (BP1). When a second force is applied to overcome the force exerted by the securing means (16), a biasing means (18) displaces the bolt (14) toward the second position (BP2).

Abstract: Disclosed are apparatus for a tilt lock latch mechanism to be incorporated in double hung windows. In one embodiment, the tilt lock latch mechanism includes a rotatable element which rotates serially from a locked position, to an open position, to a tilt position.

Abstract: A balance assembly (15) is provided for a sash window assembly (10). The sash window assembly (10) has a sash window (12) slidable within a master frame (14). The balance assembly (15) has an elastomer balance member (30) having one end adapted to be connected to the master frame (14) and another end adapted to be connected to the sash window (12) to provide an upward biasing force to the sash window (12). A system (50) is provided for custom-manufacturing the balance member (30) and for custom-manufacturing a sash window assembly (10) incorporating the balance member (30).

Abstract: A storm resistant device for a window that has a window frame enclosing at least one sash slidingly and pivotally mounted therein. The sash has side rails and the frame has vertical jambs that engage the side rails of the sash to raise and lower and pivot the sash. The storm resistant device comprises a first elongated bracket having a substantially Z-shaped cross section with two end segments and a middle segment connecting the two end segments. The middle segment is connectable to the side rails of the sashes with one of the end segments extending outward from the sash toward an adjacent jamb. There is a second elongated bracket having a substantially L-shaped cross section with two legs, one leg of the bracket adapted to be mounted to the jamb with a second leg of the L extending toward an adjacent side rail of the sash.

Abstract: A storm resistant device for a window that has a window frame enclosing at least one sash slidingly and pivotally mounted therein. The sash has side rails and the frame has vertical jambs that engage the side rails of the sash to raise and lower and pivot the sash. The storm resistant device comprises a first elongated bracket having a substantially Z-shaped cross section with two end segments and a middle segment connecting the two end segments. The middle segment is connectable to the side rails of the sashes with one of the end segments extending outward from the sash toward an adjacent jamb. There is a second elongated bracket having a substantially L-shaped cross section with two legs, one leg of the bracket adapted to be mounted to the jamb with a second leg of the L extending toward an adjacent side rail of the sash.

Abstract: A method and apparatus for installing a window assembly (10) is disclosed. The window assembly (10) includes a window frame (12), an upper (14), and an upper sash support (80). The window frame (12) includes two vertical jambs (18) and (20), a frame head (22), and a frame sill (24). The upper sash (14) includes two vertical stiles (26) and (28), an upper rail (30) and a lower rail (31). Each vertical stile (26) and (28) has an upper end and a lower end. At least one vertical stile (26) lower end has a web (41). The upper sash support (80) is adapted to receive the web (41) and support the upper sash (14). The method for installing a window assembly (10) in accordance with the present invention includes six steps.

Abstract: A school bus split-sash window with a latch release bar than can be pushed with the upward motion of one thumb. In the preferred embodiment, two normally-extended spring loaded release pins are retracted by tension on cables which are pulled around fixed stanchions in the window frame when the release bar is pushed up. The window can be opened by one hand.

Abstract: A combined sliding and pivot window assembly including a plurality of sashes separately pivotally mounted on substantially C-shaped sash support frames that are slidably fixed on rails provided on an outer window frame. The window assembly includes combined sliding and locking mechanisms that allow the C-shaped sash support frames to slide on the rails when the sashes are pivotally closed, or to be locked on the rails when the sashes are pivotally opened, or to be pushed to one side in the outer window frame while allowing all the sashes to be pivotally opened; pivot mechanisms that allow the sashes to be pivotally opened and stay at any desired open position relative to the sash support frames; and elastic two-end locking mechanisms that are mounted in a vertical member of the sashes to lock the sashes at upper and lower ends to the sash support frames simply by laterally shifting an external adjusting key of the two-end locking mechanism.

Abstract: A hardware mounting has one preferred embodiment as a tilt-latch. The tilt-latch (10) is adapted for releasably securing a pivotable sash window disposed within opposed guide rails on a master frame of a window sash assembly. The sash window (12) comprises a top sash rail (20), a base (22) and two stiles (24,26) connected together at their extremities. The top sash rail (20) has an intermediate wall (52) having an opening (56). The tilt-latch (10) comprises a housing (30) adapted to be supported in the top rail (20). The housing (30) further has an outward end opening and a bottom wall (38). The housing (30) has a tab (40) depending from the bottom wall (38) adapted to be received by the intermediate wall opening (56). The housing (30) also has a latch bolt (32) disposed within the housing (30) and having a nose (34) adapted for engaging a respective one of the guide rails.

Abstract: A window unit has a sliding sash which is moved latterly in the window frame as the sash is closed to compress weather stripping extending completely around the sash between the sash and a peripheral stop surface on the window frame. The sash is also tiltable as well as slidable.

Abstract: Disclosed is an improved window sash latch for use in a pivotal window sash adapted for installation in a master frame of a double-hung sash window assembly. The latch has a housing having a top wall having an access opening therethrough, a pair of opposing side walls and a single end wall extending between the side walls. Each of said side walls and the end wall extend from said top wall and have a free end opposite the top wall. There is a latch bolt slidably received in the housing and having a top wall, two opposing side walls and two opposing end walls. Each of the side walls and each of the end walls extend from said top wall and have a free end opposite said top wall. The first end wall is generally perpendicular to each of the side walls. The second end wall forms a beveled end arranged to be engaged in a guide rail for locking the window sash against pivotal movement.

Abstract: A tilt-latch (10) adapted for releasably securing a pivotable sash window (12) disposed within opposed guide rails (16) on a master frame (14) of a window sash assembly (11) is disclosed. The sash window (12) comprises a top sash rail (20), a base (22) and two stiles (24,26) connected together at their extremities. The tilt-latch (10) comprises a housing (42) adapted to be supported by the top rail (20). The housing (42) has an outward end opening (44) and a tongue (76) extending along a bottom wall (45) of the housing (42). The housing (42) also has a cover (51) having an elongated opening (70) defining a pair of rails (72,74). The housing (42) further has an outer edge (110). A latch bolt (46) is disposed within the housing (42) and has a nose (47) adapted for engaging a respective one of the guide rails (16). The latch bolt (46) has a first bolt channel (82) in cooperative sliding engagement with the first tongue (76).

Abstract: Structure for maintaining a sliding window sash at an intended position with respect to a frame within which the sash moves. The structure serves to retain the sash at a position along an axis generally perpendicular to a plane defined by the window frame. An inwardly facing surface of the frame has formed therein an elongated trough which extends generally parallel to a direction of intended sliding movement of the sash. A blade is mounted within a cavity in the sash and disposed for pivotal movement between a first position, wherein the blade is retracted within an outwardly facing surface of the sash, and a second position, wherein the blade is extended through the outwardly facing surface of the sash into the trough defined within the inwardly facing surface of the frame. The blade is normally biased to the second position, but it can volitionally be retracted to the first position to enable tilting inward or removal of the sash from the window frame.

Abstract: A window including a frame, a side jamb liner, a sash, and a reinforcing member. The reinforcing member includes a base portion mounted to a top surface of a check rail of the sash and an upright portion extending vertically from the base portion. The upright portion engages the rib of the side jamb liner when the side jamb liner is in a first position. The side jamb liner can be laterally displaced to a second position, where the rib will not engage the upright portion. The reinforcing member is made of a unitary piece of material.

Abstract: A tilt latch (10) for a sash window (12) has a bolt stop. The sash window (12) is disposed within opposed guide rails (16) on a master frame (14). The sash window (12) is comprised of a top sash rail (20), a base (22) and two stiles (24,26) connected together at their extremities. The tilt-latch (10) is adapted for releasably securing the sash window (12) to the master frame (14). The tilt-latch (10) is comprised of a housing (42) adapted to be supported by the top rail (20). The housing (42) has an outward end opening (44). A latch bolt (46) is disposed within the housing (42) and has a nose adapted for engaging a respective one of the guide rails (16). A protrusion (80) is located either on the latch bolt (46) or the housing (42) and a lock wall (86) is located either on the housing (42) or the latch bolt (46).

Abstract: A window or a door has a frame structure and a U-shaped bar simultaneously serving as reinforcement section and a turn-tilt mechanism.

Abstract: A locking assembly for a double-hung window assembly having a pair of vertical jamb liners, including a shoe slidable in a channel in one liner and operably connected to a sash for sliding movement therewith. A first locking member is rotatably connected to the first shoe, and manually operable means is pivotably connected to the shoe and operatively engageable with the first locking member for effectuating pivoting movement of the first locking member between (a) a limiting position wherein the first locking member engages one side wall of the one slide channel and (b) a releasing position wherein the first locking member is disengaged from the side wall of the slide channel. The first locking member including at least one tooth which engages and grips the side wall of the slide channel with the first locking member in the limiting position. A detent releasably maintains the first locking member in at least one of the limiting position and the releasing position.