Abstract: A hanging weight structure for a curtain has a hanging weight member, a connecting member, and two cover caps. The hanging weight member has two sides respectively mounted with the slot and the longer slot, and then each two hanging weight members are connected by a connecting member, so that each hanging weight member located at the lower portion of the curtain sheet is connected to each other through the connecting member to ensure the stability of the hem of the curtain sheet and maintain the curtain sheets being straight when they are collected or unfolded. Furthermore, a cover cap has the positioning rod that positioning the connecting member, which helps to improve the shading and dimming effect of the curtain sheets.

Abstract: A system for reversibly dividing a space is disclosed. Independent panels, with track followers attached to both narrow sides, move along parallel tracks. The panels start in an overhead storage space. The tracks are shaped such that as the panels move from the storage space into the space to be divided, one panel stops higher and the next panel slides down and then under the first panel. These panels preferably form a single-plane divider in the space.

Abstract: A system for reversibly dividing a space is disclosed. A first panel consists of a first vertical member and a first horizontal member attached perpendicular to a bottom end of the first vertical member and extends away from the first vertical member towards a second panel. The second panel consists of a second vertical member and a second horizontal member attached perpendicular to a top end of the second vertical member and extends away from the second vertical member towards the first panel. The first and second panel can be stored in an overhead position. The space is reversibly divided when the first panel and the second panel are lowered. The first panel is lowered such that the first panel forms a top portion of a wall. The second panel is lowered until the second horizontal member rests on the first horizontal member, forming a bottom portion of the wall.

Abstract: A sash (62) of a window opening up to 180° and capable of tilting is mounted onto a fixedly installed frame profile (63) and houses a pair of superimposing sashes that fit tightly therein when in closure position, i.e. an upper stationary sash (65) and a lower movable-divertible sash (64), each of the sashes (64,65) provided with laterally extending shafts (49) for connection with sash (62), roller wheels (50) provided onto the shafts (49) of sash (64) that roll within a predefined path created by insert guide profile members (19) and diverter guide members (66,68) to alternately bring sash (64) in a position of superimposing sash (65) and a position of alignment with the same. Lifting mechanisms (46) provided with a regulatory screw (84) for adjusting the pretension of a spring component thereof and thereby the force required by the user for moving the sash (64) are installed within the vertically extending sides of the sash (62).

Abstract: Disclosed herein are building opening protection panel systems and methods for windows, doors, and other portals that may be vulnerable to damage, such as external projectiles or wind and debris forces active during storms. The protection panel systems and methods may include a lightweight multi-wall plastic panel housed within a lightweight solid plastic shell, which can be inserted into the building opening to prevent external wind pressures and other elements from infiltrating and/or causing damage to the building and its interior contents. The multi-wall plastic panel may include through-holes and/or other apertures for threading anchoring straps. The multi-wall plastic panel threaded with straps may then be inserted and affixed within the solid plastic shell to provide a wind proof exterior face. The multi-wall plastic panel within the solid plastic shell may then be fastened to a window sash, door, and/or other anchoring structure within the building opening using the straps.

Abstract: The present invention is directed to a plunger, a plunger assembly, and a system for storing a substance or substances, preferably flowable substances, and a method of filling and sealing a substance in a storing system. In particular, the present invention provides for substantially air-free filling and storing of substances in a delivery system.

Abstract: A sliding door installation includes a roller running track and at least one roller carriage supported to be displaceable in the roller running track, at which carriage a sliding door is attached. A closing device is provided with an elastic traction means, wherein a first end of the elastic traction means is stationarily attached with regard to the roller running track, and a second end of the elastic traction means is attached to the at least one roller carriage for changing the tensile stress in the elastic traction means during a movement of the roller carriage in the roller running track.

Abstract: A interior partition includes a suspended wall track system that includes suspended wall track frame that aligns and receives an interior wall material to create a non-load bearing wall structure. The suspended wall track system may further include a suspended wall track frame that is fitted within a suspended ceiling track hanging from a ceiling floor with an unobstructed interstitial spacing between the suspended ceiling track and the ceiling floor.

Abstract: A modular merchandise display system is provided. The system comprises an enclosure, a first upper bracket and a first lower bracket forming a first pocket on a first side of the enclosure, and a second upper bracket and a second lower bracket forming a second pocket on a second side of the enclosure. A first security door is slidably and pivotally connected to the first upper and lower brackets. A second security door slidably and pivotally connected to the second upper and lower brackets. The security doors can be positioned exterior of the enclosure and then pivoted about the upper and lower brackets to be positioned substantially parallel to the front of the enclosure in a closed position. The security doors can then be secured to one another in the closed position.

Abstract: In a sliding door disposed in an opening of a cover surrounding a machine tool, From among two adjacent door panels, at least one of sliding members of the door panel which is located closer to a door frame slides on a door frame guide track, whereas at least one of sliding members of the door panel which is located farther from the door frame slides on the door frame guide track, and at least one of the remaining sliding members slides on the door panel guide track. Thus, guide means can be prevented from projecting vertically.

Abstract: The present invention is directed to a plunger, a plunger assembly, and a system for storing a substance or substances, preferably flowable substances, and a method of filling and sealing a substance in a storing system. In particular, the present invention provides for substantially air-free filling and storing of substances in a delivery system.

Abstract: The invention relates to a windbreak system formed by a set of independent, folding panels that move longitudinally along an upper guide rail and another, lower guide rail and a non-movable folding door, in which each panel and the door include a rotating shaft and folding shaft. The panels are moved manually and do not have rollers, the entire weight of the panels resting on two strips of self-lubricating polymer inserted into slots in the lower rail.

Abstract: A curved bypass door suitable for a shower or bath comprising a first door, a second door set back from the first door, and an upper track made of aluminum. In one aspect, the upper track has a lower rail adapted to receive a first roller for the first door and an upper rail adapted to receive a second roller for the second door. In another aspect, the upper rail is adapted to receive the roller of the second door and the lower rail is adapted to receive and fixedly hold the first door. Each door curvature such that both doors together form the curved bypass door. The upper track is curved to match the shape of the curved bypass door.

Abstract: A door or window assembly (10) is provided. The door or window assembly (10) includes: a track assembly (12); a first leaf (14) slidable along the track assembly (12) in a plane of the first leaf (14) between a first position and a second position; a second leaf (16) moveably coupled to the track assembly (12); and a third leaf (20) pivotally coupled to the second leaf (16). The first leaf (14) is arranged to engage the second leaf (16) to form a combined leaf (86) when the first leaf (14) is in the second position and the combined leaf (86) is arranged to be foldable against the third leaf (20).

Abstract: A linear actuator particularly for sliding doors and for sliding door or window closure elements in general, comprising a box-like body, to be fixed with corresponding elements of fixing between the two jambs of a door or of a window or door frame, in order to move a leaf by translational motion, fixed drive elements being accommodated within the box-like body which are adapted to move corresponding transmission elements which are associated with the leaf. The box-like body is telescopic in structure in order to be adapted in length to the width of the space of the door, or other window or door frame, with which it is intended to be used.

Abstract: The invention relates to a windbreak system formed by a set of independent, folding panels that move longitudinally along an upper guide rail and another, lower guide rail and a non-movable folding door, in which each panel and the door include a rotating shaft and folding shaft. The panels are moved manually and do not have rollers, the entire weight of the panels resting on two strips of self-lubricating polymer inserted into slots in the lower rail.

Abstract: A loadport has a port door and a frame with an opening through which the port door interfaces with a container door of a container for holding semiconductor workpieces. In one embodiment, a movable closure mechanism is connected to the port door and is defined to be movable in a controlled manner relative to both the port door and the frame. In this embodiment, a stationary closure mechanism is disposed on the frame proximate to the opening. In another embodiment, a stationary closure mechanism is connected to the port door, and a movable closure mechanism is disposed on the frame proximate to the opening. In both embodiments, the movable closure mechanism is defined to engage with the stationary closure mechanism such that movement of the movable closure mechanism to engage with the stationary closure mechanism applies a closing force between the port door and the container door.

Abstract: A compact, sliding door apparatus includes three vertically curved panels positioned in a doorway. A first of the panels is solid and is operatively connected to a slot above the doorway enabling the first panel to move side to side in the doorway. The second of the panels is hollow and receives a portion of the first panel. The second panel is also operatively connected to the slot above the doorway for side to side movement of the panel across the doorway. A third of the panels has a hollow interior and is stationary adjacent the doorway. The third panel hollow interior receives a portion of the second panel. The doorway is opened by moving the first panel into the second panel interior to open a portion of the doorway, and then moving the second panel into the third panel interior to fully open the doorway.

Abstract: An overhead door system featuring independent, unconnected panels is described. Each panel end is operatively carried within a pair of parallel tracks. The weight of the door decreases as the door is lifted and each panel completely disengages from its adjacent panel as it reaches the stacked position. This allows for a linear spring torque to door weight relationship requiring a very small motor compared to existing designs to provide the lifting torque necessary to operate the door.

Abstract: A sliding window assembly for a vehicle includes a fixed panel and a sliding panel moveable relative to the fixed panel between an open position and a closed position. An elongated member is connected to the fixed panel and defines a channel extending along a longitudinal axis from a first end to a second end. The channel receives the sliding panel for movement of the sliding panel relative to the fixed panel. A rail is disposed in the channel along the longitudinal axis and is spaced along the longitudinal axis from the first end. The elongated member defines a drain hole molded into the elongated member in the channel. The drain hole is defined between the rail and the first end of the channel along the axis for draining water from the channel.

Abstract: An enclosure system includes a plurality of elongated panels consecutively connected to one another. The plurality of elongated panels includes a plurality of independent panels and a panel-door. The enclosure system also includes an upper track constructed and arranged to receive an upper portion of the plurality of elongated panels and a lower track constructed and arranged to receive a lower portion of the plurality of elongated panels. The lower track includes two polytetrafluoroethylene (PTFE) strips constructed and arranged as a transport system for facilitating movement of the plurality of elongated panels along the upper track and the lower track by achieving a very low coefficient of friction enabling heavy weights to be moved with little effort. Substantially all weight of the plurality of elongated panels is supported evenly across a length of the lower track on the two PTFE strips.

Abstract: A door protection device pivoting about an axis and being applied against a wall when in the open position includes a portion added on to outside surface of the door and a portion added on to the wall, so that, in the open position of the door, the portions nest together, the two portions of the device being aligned along the same axis of direction perpendicular to the pivoting axis of the door.

Abstract: A window includes a frame, a rail module, and two sashes. The rail module includes a first rail, a second rail, and a pulley assembly. The first rail is fixed to the frame, and the second rail is able to turn. The second rail is turned to connect to the first rail so that the pulley assembly can slide in both the first and the second rails. The first sash is pivoted on the frame, and the second sash is hinged with the first sash and connected to the pulley assembly. The pulley assembly is moved to the second rail from the first rail to make the sashes fold up. After the second sash arrives at the second rail, one may turn the folded sashes totally off the window and attach them to a wall besides the window.

Abstract: A vehicular window assembly includes a frame, a fixed window panel bonded to a lower frame portion and a movable window assembly. The side frame members of the movable window include upper and lower guide elements that are slidably received in respective channels along opposite portions of the frame. The channels are configured to move the movable window along the fixed window panel when the movable window assembly is at least partially opened and to move the movable window to a position where the movable window panel is generally coplanar with the fixed window panel when the movable window assembly is closed. When the movable window is in its closed position, a seal sealingly engages an inboard surface of the side frame members and an inboard surface of the upper frame member and an inboard portion of an upper perimeter region of the fixed window panel.

Abstract: A slideable and pivotable door assembly configured to selectively permit passage through an opening between a first side and a second side of the opening. The slideable and pivotable door assembly has a normally fixed door panel arranged to cover a first portion of the opening when in a normally closed fixed position. The door assembly also includes a slideable door panel slidable relative to the fixed door panel. The slideable door panel is slidable between a 1) closed position wherein the door panel covers a second portion of the opening and 2) an open position wherein the second portion of the opening is uncovered. A first pivot structure enables pivotal movement of the normally fixed door panel upon a pivoting actuation and a second pivot structure enables pivotal movement of the slideable door panel at any position relative to the normally fixed door panel while the normally fixed door panel remains in its normally fixed position.

Abstract: The invention provides a door system comprising a door leaf having a first horizontally disposed edge and a second horizontally disposed edge inferior to the first horizontally disposed edge; a rod-less cylinder in communication with the first horizontally disposed edge; and a cam surface formed with the second horizontally disposed edge to limit the door to a single plane of movement relative to an opening of an enclosure defining a door jamb.

Abstract: A window assembly (30) comprising a frame (36) in which are received sliding and security members. The security member has ventilating and non-ventilating parts (40, 32), with the sliding member (34) being slidably moveable over the security member between a first position in which air may pass through the ventilating part (40) so as to ventilate the room in which the window assembly (30) is located, and a second position in which no such ventilation can occur. The ventilating part 40 may comprise a grille, perforated sheet, lattice arrangement or the like.

Abstract: A door assembly that includes a normally fixed door panel disposed between an ingress opening and an egress opening. The door assembly includes a first sliding door panel slidable between a 1) closed position wherein the first sliding door panel blocks the ingress opening and 2) an open position wherein the first sliding door panel is in an overlapping configuration with the normally fixed door panel so as to permit persons to egress through the egress opening. A second sliding door panel is slidable between a 1) closed position wherein the second sliding door panel blocks the egress opening and 2) an open position wherein the second sliding door panel is in an overlapping configuration with the normally fixed door panel so as to permit persons to ingress through the ingress opening. The normally fixed door panel is pivotable to a breakout open position upon receiving a pivoting actuation.

Abstract: A gate below an elevator car which prevents access to an elevator hoistway. The gate slidably mounts behind a toe guard and retracts upwardly if the bottom of the gate encounters a person, object or the floor of the elevator pit during downward travel of the elevator. The gate latches when fully retracted so that it may be out of the way during maintenance. A microswitch is wired into the emergency stop circuit that engages when the gate is latched. A trip wire defining the bottom edge of the gate is also wired into the emergency stop circuit, so that the elevator will stop its downward travel if it encounters an obstruction. Rubber bumpers on the bottom edge of the gate cushion impact to people or objects who happen to be below the elevator car and are struck by the gate during downward elevator movement.

Abstract: A merchandiser includes a case defining a product display area, and a lid disposed over the product display area and substantially enclosing at least a portion of the product display area. The lid is movable between an open position providing access to the product display area and a closed position limiting access to the product display area. The merchandiser also includes a handle assembly that has a handle coupled to and rotatable relative to the lid as the lid moves between the open position and the closed position.

Abstract: A sliding door with a sliding panel and a fixed panel allows for the sliding panel to pivot with respect to the fixed panel regardless of the position of the sliding panel and allows both the sliding panel and fixed panel to pivot with respect to an outer frame in which the panels are mounted when the sliding panel is fully open or nearly fully open without requiring a floor track. The sliding panel may move linearly with respect to the fixed panel and outer frame along the length of a header, and a guide bracket cooperatively engaged with the sliding panel may be partially positioned in a guide track formed in the fixed panel bottom rail. A floor plate may be secured to the floor surface adjacent the bottom end of a first jamb to provide support/stability to the panels.

Abstract: A sash window includes two window frames disposed in lateral juxtaposition and each including a head member, a sill member and a pair of jamb members connected together into a rectangular configuration, and a pair of upper and lower sashes supported within a respective one of the window frames. A sill nose facing member is mounted to exterior sides of the sill members and extends continuously from an outer end of one sill member to an outer end of the other sill member. Each window frame has miter joints at corners thereof so as to provide sufficient structural strength. The miter joints formed between the sill member and the jamb members are covered or concealed and do not deteriorate an aesthetic appearance of the sash window.

Abstract: A sliding panel includes multiple connecting/adjacent carrier tracks such as two/three/four carrier tracks while connectors of each carrier track are disposed in opposite directions or at intervals. Thus the multiple connecting/adjacent carrier tracks slide in parallel under the same channel. Moreover, the positions of each connector on top surface of respective carrier track are in alternating arrangement so as to allow runners of multiple connecting/adjacent carrier tracks being mounted inside the same channel simultaneously. The runners of the connecting/adjacent carrier tracks move inside the channel of a rail at the same time and the connecting/adjacent carrier tracks slide in parallel under the same channel. Therefore, the number of channels of the rail is decreased and the amount of material used for producing the rail is reduced. Furthermore, the rail can be designed to have two-step inner and outer rails for adjusting length of the rail.

Abstract: A construction product such as a window or door includes a multi-functional thermal break. The thermal break serves to contact and support elements of the sash of the construction product. The thermal break also provides one or more additional structural functions for the construction product.

Abstract: A loadport has a port door and a frame with an opening through which the port door interfaces with a container door of a container for holding semiconductor workpieces. In one embodiment, a movable closure mechanism is connected to the port door and is defined to be movable in a controlled manner relative to both the port door and the frame. In this embodiment, a stationary closure mechanism is disposed on the frame proximate to the opening. In another embodiment, a stationary closure mechanism is connected to the port door, and a movable closure mechanism is disposed on the frame proximate to the opening. In both embodiments, the movable closure mechanism is defined to engage with the stationary closure mechanism such that movement of the movable closure mechanism to engage with the stationary closure mechanism applies a closing force between the port door and the container door.

Abstract: A livestock trailer with sliding safety door having a trailer with a two section sliding door mounted at the rear and hung from a slidable rail assembly at the top and retained by a guide at the bottom wherein the guides are steel reinforced. The sliding safety door, being secured at top and bottom, facilitates the loading and unloading of livestock by minimizing injuries sustained from kicking the door and eliminating injuries sustained when utilizing prior art swinging door type livestock trailers. The sliding door mechanism further eliminates the need to reposition the trailer while docking to a loading ramp so as to provide clearance to operate the door.

Abstract: When a sliding door (3) as a plate-like object is moved in a front and rear direction from a closed position to an opening preparation position, a rotatable rail (20) rotates from a horizontal lying position to a vertical standing position about a rotation axis (L1). When the sliding door is in the opening preparation position, a roller (40) of the sliding door (3) rides on a running track (25b) of the rotatable rail (20). When the sliding door (3) is further moved from the opening preparation position to an open position, the roller (40) transfers from the running track (25b) to an auxiliary track (26) of an adjacent rotatable rail (20). The rotatable rail (20) is biased toward the standing position by an elastic force of a torsion spring (18) and maintained in the standing position by an arm (13). This allows the sliding door (3) to be returned to the opening preparation position.

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 pair of interlocking bi-parting sliding doors includes a first sliding door and a second sliding door, wherein the first sliding door has a first meeting stile that includes a first side portion for maintaining a door glass panel and a first mating side portion for engaging the second sliding door, wherein the first mating side portion includes a plurality of recessed zones, and wherein the second sliding door has a second meeting stile that includes a second side portion for maintaining a door glass panel and a second mating side portion for engaging the first mating side portion of the first sliding door, wherein the second mating side portion includes a plurality of extensions, wherein when the first sliding door and the second sliding door are in a closed position, the plurality of extensions interlock with the plurality of recessed zones.

Abstract: An exemplary display device includes a support member, a pair of displays slidably attached to the support member, and positioning members disposed between the displays and the support member. The support member includes a straight slideway, and a curved slideway defined therein. The curved slideway includes a slanting portion, and a first straight portion and a second straight portion extending out from opposite ends of the slanting portion. The straight slideway is parallel to the first straight portion of the curved slideway and in line with the second straight portion of the curved slideway. The displays are slidably received in the straight slideway and the curved slideway respectively. The displays may be positioned to form a large screen, or slid to overlap leaving a single display visible.

Abstract: A frame assembly for a window or patio door includes an integrally moulded unitary master frame having upper and lower horizontal members, opposed first and second vertical jamb members extending between the horizontal members, and a vertical mullion midway between the first and second vertical members. An integrally moulded unitary sash frame is slidably mounted within the master frame. The sash frame can be lifted within the master frame to facilitate installation and removal of the sash frame. The mullion can include a weather buffering chamber to reduce fluid penetration from an exterior to an interior side of the frame assembly.

Abstract: A frame assembly for a window including a sash that slides vertically within a master frame. The master frame is substantially of unitary, one-piece construction that can advantageously be manufactured by an injection moulding process. The sash frame can also be of unitary, one-piece construction, and can also be manufactured by injection moulding. The master frame can be provided with liner support structures along the jambs to receive jamb liners in snap-fit. The liner support structures can advantageously be integrally moulded with the master frame.

Abstract: A sash window includes two window frames disposed in lateral juxtaposition and each including a head member, a sill member and a pair of jamb members connected together into a rectangular configuration, and a pair of upper and lower sashes supported within a respective one of the window frames. A sill nose is mounted to exterior sides of the sill members and extends continuously from an outer end of one sill member to an outer end of the other sill member. Each of the upper sashes is fixed to the respective one of the window frames by attachment members.

Abstract: The multipanel sliding door comprises at least two panels which are supported for travel in substantially parallel planes along runners, and is characterised in that a rack and wheelwork arrangement is provided for the movement of the door panels.

Abstract: A method of managing a plurality of operable wall panels in a room equipped with an overhead track system from which the panels suspend and in which the panels are movable to selectively partition the room, the track system including a reading portion. The method comprising providing an identification tag on each of the plurality of panels, each identification tag having panel information, and wirelessly communicating between the identification tag of each of the plurality of panels and a controller, wherein the controller being operable to receive and transmit panel control data comprising the panel information.

Abstract: A door assembly for an elevator having a cab having a cab entry, the elevator having an elevator shaft having upper and lower shaft entries, the assembly incorporating first, second, and third ladder frames having a plurality of roller carrying rungs and bolt and spacer sleeves spanning between the ladder frames' rungs, each ladder frame having proximal and distal ends, the first ladder frame overlying and extending outwardly from the elevator's cab entry, the second ladder frame overlying and extending inwardly from the elevator's upper entry, and the third ladder frame overlying and extending inwardly from the elevator's lower entry; the door assembly incorporating first, second, and third pluralities of rollable trolleys mounted upon the first, second, and third ladder frames' pluralities of roller carrying rungs; and the door assembly incorporating first, second, and third pluralities of door panels, suspending from the first, second, and third pluralities of rollable trolleys.

Abstract: A window assembly configured for installation in a recessed window aperture comprises one or more transparent fixed position panes, one or more sliding panes, and a mounting frame. The mounting frame comprises at least a substantially full-circumference, molded plastic frame member and reinforcement integral with the frame member. The mounting frame at least partially defines a window opening. The mounting frame, e.g., the frame member, forms upper and lower slider runways extending laterally above and below the window opening. The sliding pane is slidably positioned in the upper and lower slider runways for sliding movement between open and closed positions. The mounting frame mounts the fixed position pane(s) by adhesive surface bonding to the interior surface of the fixed position pane. The exterior surface of the fixed position pane is free of adhesive.

Abstract: A sliding door includes a frame comprising an elongated header member having a topwall, a backwall, an intermediate wall and a bottom wall. The bottom wall and intermediate wall are engageable with sliding door panel support rollers and the bottom wall and intermediate wall are interconnected by a separate support member to distribute door panel loads between such walls. A movable cover is attached to the header member by a hinge part including spaced apart flanges and projections co-operable with projections on the header member to support the cover in open and closed positions. The door operator is supported in the header member by a single angle-shaped frame member supporting a power supply, a controller and a door operator motor. An adjustable torsion bar assembly supports the door panel against sagging.

Abstract: A method of managing a plurality of operable wall panels in a room equipped with an overhead track system from which the panels suspend and in which the panels are movable to selectively partition the room, the track system including a reading portion. The method comprising providing an identification tag on each of the plurality of panels, each identification tag having panel information, and wirelessly communicating between the identification tag of each of the plurality of panels and a controller, wherein the controller being operable to receive and transmit panel control data comprising the panel information.

Abstract: A slider window assembly for an automotive vehicle comprises a fixed glass panel adapted to be installed in a window frame defined by a body panel. The fixed glass panel is bonded to the window frame by an adhesive bead and defines an opening. A sliding window opens and closes the opening and includes an edge that is received in a guide rail that is adhesively bonded to the fixed glass panel. The guide rail defines a channel for the edge of the sliding window and also includes an extension that is bonded to the window frame by the adhesive bead. In this manner, the guide rail continues to support the sliding window in the event that the fixed glass panel is unable to provide the primary support function.