Abstract: The present disclosure relates to the building industry and in particular to a block for use in automated building construction. In one aspect, the block comprises a generally cuboid body having a top and a base, a length extending between a pair of opposed ends, and a width extending between a pair of opposed sides; the body including a plurality of hollow cores extending from said top to said base, and arranged in a row between said opposed ends; wherein each core has a rectilinear cross-sectional shape; and wherein the thickness of the block between each pair of adjacent cores is at least double the thickness of the block on all other sides of each core, so that the block is divisible into a plurality of substantially identical block portions, each portion including four walls of substantially uniform wall thickness about its core.

Abstract: A containment system for separating a containment area from an external environment may include one or more panel assemblies, various types of door assemblies, a flexible corner assembly, and other components that form a modular system capable of adapting to various configurations using a minimal number of fasteners, brackets, and/or clamps.

Abstract: Building panels, especially floor panels are shown, which are provided with a locking system that is configured to lock the adjacent edges by angling and that have a tongue and a strip on the same edge, and a method to divide a board and produce such building panels. A method for dividing a floor element, into a first floor panel and a second floor panel, said floor element including a core provided with a decorative surface layer and a balancing layer, wherein the method includes the step of forming, through the balancing layer or the decorative surface layer, a second groove by displacing the floor element past a fixed tool.

Abstract: A cellulose-based structural building panel assembly includes a cross-laminated timber (CLT) core which is reinforced with one or more post-tensioned tendons stressed to a pre-selected tensioning force, following the placement as part of the panel assembly. The tendons are provided within a sleeve which is grouted with a channel formed in an underside of the core and which after post-tensioning of tendons is infilled with a binder securing the tendons in a fully bonded configuration.

Abstract: A framing assembly has at least one rafter vent assembly having a connecting member with a plurality of vent tubes for providing supplemental ventilation and additional structural support to a frame of a building structure. The at least one rafter vent assembly may be an interior rafter vent assembly or an exterior rafter vent assembly. The interior rafter vent assembly has at least one brace member and a connecting member, with the connecting member having a connecting plate, two end plates, and the plurality of vent tubes. The exterior rafter vent assembly has the connecting member that has a connecting plate and the plurality of vent tubes. The framing assembly also preferably has a plurality of modified structural insulated panels (SIPs) and modified rafter splines.

Abstract: A deck platform hanger/joist runner includes a flat platform, and a joist engager coupled to the flat platform. The joist engager includes a top joist engagement structure having a top joist engager and a bottom joist engagement structure having a bottom joist engager. The top joist engagement structure includes a pivot point configured to engage with a joist to pivot the deck platform hanger to engage the joist with the top joist engager and the bottom joist engager.

Abstract: A tubular beam with mechanically fastened end plates preferably includes a tubular member and at least one end plate. At least one cross plate may be secured within the tubular member with fasteners to strengthen thereof. The tubular member may have any suitable cross section including, square, rectangular, hexagonal, triangular or the like. A plurality of hand access openings, a plurality of beam fastening holes and a plurality of fastener holes are formed through a side wall of the tubular member. The end plate is attached to an end of the tubular beam with a plurality of fasteners. A fastener gusset may be formed in inside corners of the tubular member to accommodate a blind fastener hole for attaching the at least one end plate. Each end plate preferably includes a hand access opening, a plurality of plate fastening holes, and a plurality of blind fastener holes and/or fastener holes.

Abstract: A sustainable, integrated framing system and methods of assembly thereof are presented herein. In some embodiments, a roof, primary structure, and a ceiling are structurally defined and supported by pre-fabricated load bearing ribs of the sustainable, integrated framing system. The pre-fabricated load bearing ribs facilitate efficient building erection on-site without expensive and time consuming welding and associated inspections. Each rib includes a compression chord element, a web element extending below the compression chord element, and one or more adjustable tension elements embedded within the web element. An end support node is attached to each end of a load bearing rib structure and the one or more tension elements are tensioned against the end support node (s). In some embodiments, the top profile, the bottom profile, or both, of a web structure are shaped to meet aesthetic or functional design objectives independent of the load carrying capability of the load bearing rib.

Abstract: Connector for connecting rebar intersections of a foldable FRP rebar cage includes two channels for receiving the intersecting FRP rebar. One channel has a spherical member and the other has arms shaped to hold the spherical member, to allow the connected rebar to rotate in the X, Y and Z axes.

Abstract: Asphalt-based roofing materials, such as shingles, are disclosed that include a band of a parting material. The asphalt-based roofing material includes at least one asphalt-coated substrate that defines a headlap portion and a tab portion each having opposed top and bottom surfaces; a layer of backdust applied to at least a portion of the bottom surface of the headlap portion and to at least a portion of the bottom surface of the tab portion; a release section of parting material applied to the layer of backdust, where the parting material is included in the in the range of 0.0005 kg/m2 to 1 kg/m2; and an adhesive.

Abstract: A metal roof construction provides a roof frame that includes multiple rafters. A plurality of clips or anchor plates are fastened to each rafter. Each anchor plate or clip has an anchor plate space surrounded by one or more plate members. The anchor plate has a plurality of spaced apart openings. A sliding anchor occupies the anchor plate space. Each sliding anchor has multiple spaced apart pedestals that extend from the anchor plate space upwardly through an opening. Multiple roof decking sections are mounted on the rafters. Each decking section extends under a part of the anchor plate. The anchor plate has one or more flaps that extend downwardly from the decking sections and next to a rafter. Fasteners attach each flap to a rafter.

Abstract: An exterior building structure using a unit integrated with insulation is proposed.

Abstract: The present invention relates to a panel and to a floor covering including the same. The present invention also relates to other coverings, such as a wall covering, which are constructed by using a plurality of the panels. According to the invention, the panel includes a first and second coupling profile on opposing sides of the panel. The first coupling profile includes an upward tongue that has a curved portion. This upward tongue is spaced apart from a first inner flank of the panel by a clearance that defines an upward groove. According to the invention, an outermost point of the curved portion is positioned further away from the first inner flank than a center point of the upward tongue.

Abstract: A floor board including a decorative surface layer applied to a substrate, where the substrate has MDF or HDF material at a side edge thereof, where the side edge is treated both with an impregnation agent and/or a sealing agent based on a superabsorbing material. Also a method for manufacturing such floor boards.

Abstract: A set of decking boards including a first and a second decking board and being provided with a connecting system including a connecting device. The first board is configured to be connected to a support element and the second board is configured to assume a vertically locked state with respect to the first board in which the connecting device cooperates with the first and second boards, there is a vertical gap between a portion of the second lip of the first decking board and a portion of the second lip of the second decking board, and there is a horizontal space between a first lip of the first board and the second lip of the second board. Also, other aspects of a set of decking boards and connecting devices as well as methods for demounting decking boards and replacing them with new decking boards.

Abstract: A system for installing a door slab in a door frame. The system comprises an adaptable door mounting support configured to acquire a door gap and to support the door slab at a height off of the ground equal to the door gap. The door mounting support includes a frame member and at least one tie device provided to meter the door gap and hold the door slab in place off the ground at the height equal to the door gap. The frame member includes two A-shaped segments interconnected by a bottom section and together defining a door support channel therebetween. The at least tie device includes a cable tie extending across the door support channel and a locking tab attached to the cable tie by sliding the locking tab over the cable tie. The locking tab is lockable on the cable tie.

Abstract: A drywall mud applicator tool includes a body having a wall engaging applicator face, a first end, a second end, a first side and a second side. A first wheel is mounted for rotation on an axle which is secured to the first side adjacent to the first end. A second wheel is mounted for rotation on an axle which is secured to the second side adjacent to the first end. A third wheel is mounted for rotation on an axle which is secured to the first side adjacent to the second end. A fourth wheel is mounted for rotation on an axle which is secured to the second side adjacent to the second end. A first mud containment skirt extends along the first side from the first end to the second end. A second mud containment skirt extends along the second side from the first end to the second end.

Abstract: A tile leveling system includes a stem, a spinner, and an engaging member. The stem includes a base and a fork extending from the base. The fork includes a cylindrical portion extending in a direction opposite the base and having an externally threaded surface. A cutout is formed in the fork between the cylindrical portion and the base. The spinner includes a hub, a rim, and one or more spokes extending between the hub and the rim. An internally threaded surface defining a bore extends through the hub. The engaging member includes a main body and a mounting portion extending from the main body. A hub-receiving bore is formed in the main body for receiving the hub of the spinner and a stem-receiving bore is formed in the main body for receiving the cylindrical portion of the stem.

Abstract: The various embodiments of the present invention provide a modular slab formwork with easy shuttering and de-shuttering assembly. The formwork comprises a formwork panel and a drophead. The formwork panel comprises a plurality of side connectors, a base frame, and a form-lining. The base frame comprises a corner element on each corner. The drophead is connected to each corner of the formwork panel through the corner element. The corner element forms a locking notch to lock at least two formwork panel with each other as well as with the drophead.

Abstract: A device for a distribution mast includes a line and a line section mounting. The line has a mast line section and a loose rotational line section, and the rotational line section is rotatably connected to the mast line section. The line section mounting has a loose rotational holding element and a rotary bearing, and the rotational holding element keeps the rotational line section at a distance from the mast line section. The rotary bearing is designed to be supported by a mast segment for the distribution mast and for rotatably connecting the rotational holding element to the mast segment and defines a circle, the line being guided through the circle.

Abstract: A binding machine includes a main body, a wire feeder, a curl forming part, a cutter configured to cut the wire wound on the object to be bound, a binding part including a rotating shaft, a handle provided on one side of the main body in a first direction intersecting an axial direction of the rotating shaft, a blower configured to generate an air flow through an inside of the main body; and an exhaust port provided on one side or another side of the main body in a second direction intersecting the axial direction of the rotating shaft and an extending direction of the handle, and configured to exhaust air generated by the blower and passed through the inside of the main body.

Abstract: A skylight leak repair kit and method especially adapted for use in repairing a skylight damaged dome mounted in a metal frame on a commercial flat roof. Required equipment includes an oversized sheet formed of PVC membrane which is 12 oz to 20 oz per yard in weight and reinforced with a mesh network of fibers, sticks of termination bar about 1 inch high with pre-punched holes spaced about 6? to 8? on center, self-tapping metal screws with plastic washers. Steps include draping the sheet, positioning sections of the termination bar along the metal frame, pleating the sheet along the sides and securing the sheet along the metal frame with the self-tapping metal screws while avoiding the pleats but coming within inches of the corners with the termination bars.

Abstract: An umbrella assembly including a central shaft, the central shaft having a first end and a second end opposite the first end; a canopy coupled to the first end of the central shaft; an auger extending from the second end of the central shaft; a collar/hub nonslideably coupled to the central shaft and spaced from the auger; a plurality of legs, each of the plurality of legs having a first end and a second end; wherein the first end of each of the plurality of legs is coupled to the collar/hub, the second end of each of the plurality of legs extends towards the auger, and the collar/hub remains in a fixed position with respect to the central shaft when the second end of each leg extends outwardly from the central shaft to a deployed position and returns towards the central shaft from its deployed position to a stowed position; and a flexible material having an opening through which the central shaft extends and wherein the second end of each leg is coupled to the flexible material.

Abstract: An in-ground niche is disclosed. Example in-ground niches can comprise containers of appropriate size and shape for human or animal cremated remains storage. A portion of an in-ground niche can define an in-ground storage cavity, while another portion thereof can provide a lid support structure for a lid that is positionable on or above ground level. An in-ground niche can also comprise attachment points, both for security bolts to secure the lid to the lid support structure, and for anchor rods to anchor the in-ground niche in the ground.

Abstract: Embodiments are directed to a vehicle privacy curtain attachable to a vehicle to form a private enclosed area. The curtain can include a piece of flexible material including a main portion positioned between a laterally extending first flap, a laterally extending second flap, and a vertically extending third flap. In various embodiments the curtain further includes a first set of magnets in the first flap and a second set of magnets in the second flap each including one or more magnets positioned inwardly from a lateral edge at a distance of 0% to 33% of a lateral width of the respective first flap. In embodiments the curtain includes a third set of magnets in the third flap including third and fourth magnets positioned inwardly from their respective edges at a distance of 0% to 33% of a lateral width of the third flap.

Abstract: An enhanced security fence for use in high security situations is provided. The fence is made of high strength materials that are preferably welded together in a convenient, location and sent as prefabricated sections to the installation location to form an all welded bracket-less perimeter barrier fence system. Posts with section hangers are provided and installed at a perimeter, and the prefabricated panels are quickly and securely attached to the posts. The panels can be friction fit to the posts and, if desired welded thereto. The invention includes a method of creating an enhanced security fence, that includes prefabrication of panels and rapid, fitting and securing the panels to posts to more quickly create a secure perimeter in places having difficult environments.

Abstract: A privacy shade partition system is provided. The system may utilize a plurality of frame members adjustably coupled to one another. Each of the plurality of frame members may have a plurality of attachment points permanently coupled thereto. Further, the plurality of frame members may be adjustably coupled to one another via a plurality of interlocking adjustment mechanisms. The system may additionally utilize a plurality of legs coupled to the plurality of frame members. Each of the plurality of legs may comprise a bracket coupling mechanism adjustably coupled thereto. Further, the system may have a privacy shade coupled to each of the plurality of attachment points.

Abstract: A lane rope float having higher wave absorbing performance than before is provided. A lane rope float is one that is attached to a rope R via a tubular portion and divides lanes of a pool, and the lane rope float is characterized by: including a plurality of blades that protrude from a side surface of the tubular portion in parallel with the rope R, and a wall surface portion that is coupled to side end portions of the blades to cover the blades, in which in an outer end portion of the lane rope float from the center of the tubular portion to the wall surface portion, at least ½ of the range from the center of the tubular portion to the wall surface portion is formed along a vertical plane V2 perpendicular to the tubular portion.

Abstract: Exemplary embodiments are directed to pool cleaners that remove debris from water using a plurality of cyclonic flows, or that include a removable impeller subassembly, a check valve for a debris canister, a particle separator assembly having a handle that locks to the pool cleaner, a modular roller drive gear box, or a roller latch that secures a roller to the pool cleaner. Exemplary embodiments are also directed to the check valve and the roller latch themselves. Exemplary embodiments are directed to a filter medium for pool cleaners that includes embossments providing flow channels for water, and to roller assemblies for pool cleaners. Exemplary embodiments are directed to pool cleaners including alternative pump motor engagements. Exemplary embodiments are directed to pool cleaners power supplies that include a potted and contoured power board assembly, and to kickstands therefor. Exemplary embodiments are directed to a pool cleaner caddy, and removable wheels therefor.

Abstract: The present disclosure discloses a swimming pool cleaning robot with a movement state detection function, including a main body on which a control module is arranged; a rotating member is rotatably arranged outside the main body; a water fender is also arranged outside the main body; part of the rotating member is located in the water fender; the swimming pool cleaning robot further includes a rotating speed detection assembly used for detecting a rotating speed of the rotating member; and the rotating speed detection assembly is electrically connected to the control module. The moving speed of the swimming pool cleaning robot can be accurately acquired by detecting the rotating member's rotating speed; a movement trajectory of the swimming pool cleaning robot can be controlled by controlling the swimming pool cleaning robot's moving direction; and the entire detection system has a simple and reliable structure and is convenient to maintain.

Abstract: A pool cleaner includes a vent mechanism and a water port in fluid communication with the vent mechanism. When a forward end of the pool cleaner extends above a waterline of the pool, water flows through the vent mechanism and the water port over an inlet port and prevents loss of suction at the inlet port. A protruding member of the pool cleaner contacts submerged obstacle and tilts the pool cleaner to prevent the pool cleaner from becoming stuck on the submerged obstacle.

Abstract: Opening and closing a door without the use of one's hands is facilitated. For instance, an apparatus can comprise one or two rotatable rings. For a one ring apparatus, the ring can have an opening so that the inner cross section of the opening of the ring can be pushed with a forearm or knee so that the ring will rotate and the person can then pull on the ring with his/her forearm or knee to open the door. In a two-ring apparatus, two adjacent rings, both with openings, can comprise similar push surfaces. When pushed on the pushed surfaces, the rings will rotate and the cross sections of the openings of the rings come into contact with one another, creating a surface against which a forearm or knee can pull on to open the door. A rotation plane converter can turn a doorknob using the apparatus.

Abstract: One or more embodiments describe a magnetic actuator including at least two magnets. One magnet is a semi hard magnet and the other magnet is a hard magnet. The hard magnet is configured to open or close the magnetic actuator. The semi hard magnet and the hard magnet are placed adjacent to each other. A change in magnetization polarization of the semi hard magnet is configured to push or pull the hard magnet) to open or close a digital lock realised with the magnetic actuator. The magnetic actuator can also be used to realise a valve.

Abstract: A handle set including a chassis and a handle mounted on the chassis. The handle includes a shank having a load bearing section, a primary actuating section, and a secondary actuating section. The chassis includes a housing, a support spindle, a primary actuator, and a secondary actuator. The support spindle is longitudinally coupled with the load bearing section, and the primary actuator is rotationally coupled with the primary actuating section of the handle. The handle set has a first configuration in which the secondary actuating section is engaged with the secondary actuator, and a second configuration in which the secondary actuating section is disengaged from the secondary actuator.

Abstract: Enclosure covers for use with direct burial enclosures are provided. The enclosure covers includes a latch assembly that permits the enclosure cover to automatically lock to an enclosure box when installed.

Abstract: A vehicle door handle device includes: a base frame formed of a resin and arranged on an inner side of a door outer panel; a pad member arranged on an outer side of the door outer panel; a first fastening member formed of a metal and having a base frame engaging portion and a first panel engaging portion engageable with the inner side of the door outer panel; and a second fastening member formed of a metal and having a held portion and a second panel engaging portion engageable with the outer side of the door outer panel. The first and second fastening members are fastened to each other, the door outer panel is sandwiched between the first and second panel engaging portions, and the base frame engaging portion engages the base frame to restrict movement of the base frame in a direction away from the door outer panel.

Abstract: A motor vehicle lock, in particular a motor vehicle door lock, which is provided with a locking mechanism consisting substantially of a rotary latch and a pawl. In addition, a latching element, which is arranged in the engagement region between two locking mechanism components is provided, wherein said latching element is pivotably mounted on the rotary latch and/or the pawl for the most part in a plane of the locking mechanism (E). According to the invention, the latching element has a guide extension, which projects relative to the plane of the locking mechanism (E), for additional axial and/or radial guidance.

Abstract: An opening/closing assembly for a door configured to actuate certain latches during a powered operation and to actuate not all the same latches during a manual (emergency) operation. The assembly operates to decouple the operation of levers associated to the various latches of the door. The assembly is configured such that a hold-close latch is actuated for both a powered operation and a manual operation, while a hold-open latch is not actuated during the manual operation and is only actuated during the powered operation.

Abstract: A door handle assembly and unlocking method include a handle connected to a base by a hinge for rotation between an idle position, substantially parallel to the base, and a door-opening position, inclined relative to the base. An actuator is within the base and moves the handle to at least the opening position. A first control device in the handle and connected to an electric unlocking system. The handle includes a tactile area on an inner surface for receiving pressure applied by the user's hand for activating the first control device and generating a first control signal. A second control device is on the base and is actuated by movement of the handle from the opening position to an over-opening position to generate a second control signal. The electric unlocking system receives the first or second control signal in order to unlock and allow opening of the door.

Abstract: A hinge assembly for an appliance includes a base plate, a hinge plate, a shaft, a stop block, and a stop. The base plate has a first pair of spaced-apart eyelets. The hinge plate has a second pair of spaced-apart eyelets and a central eyelet disposed between the eyelets of the second pair of eyelets. The shaft extends through each eyelet of the first pair of spaced-apart eyelets, second pair of spaced-apart eyelets, and central eyelet. The hinge plate is configured to pivot relative to the base plate via the shaft. The stop block protrudes from a first eyelet of the first pair of spaced-apart eyelets. The stop extends from the central eyelet and is configured to engage the stop block to limit radial movement of the hinge plate relative to the base plate.

Abstract: An apparatus can be used for controlling a door for a vehicle. A sensor unit is provided in the door and configured to sense an object adjacent to a region outside of the door. A controller configured to calculate a distance between the object and the door based on a signal received from the sensor unit, set a range by dividing and setting sensing ranges for each sensing distance of the sensor unit, and control the door to be opened while the distance to the object is gradually reduced in a state where the door is closed, such that the object is sensed within a predetermined range. The range is set by setting a maximum sensing distance in a state where the door is opened to be longer than in the state where the door is closed.

Abstract: An actuator for opening and closing a door or a tailgate of a car contains a helical compression spring and a motor. The helical compression spring is provided for opening a door or the tailgate of a car when compressive forces of the helical compression spring are released. The motor is provided for compressing the helical compression spring in order to close the door or the tailgate of the car. The helical compression spring contains a helically coiled coated steel wire. The helically coiled coated steel wire contains a steel core and a metallic coating layer. The steel core contains a steel alloy. The steel alloy contains 0.8 to 0.95 wt % carbon, 0.2 to 0.9 wt % manganese; 0.1 to 1.4 wt % silicon; optionally one or more micro-alloying element. The microstructure of the steel core is drawn lamellar pearlite. The metallic coating layer contains at least 84% by mass of zinc.

Abstract: A control and drive assembly for a transport vehicle door, and which includes a main control unit; a main motor to drive the door leaves and which is controlled by the main control unit to displace the leaves; an auxiliary control module; an auxiliary motor operable to: control the auxiliary motor so as to displace the leaves in at least one direction to a closed position, control a locking of the leaves in the closed position; and a connection device arranged between the main control unit and the auxiliary motor to facilitate transmission of a reference signal by the main control unit to the auxiliary control module, the reference signal being representative of a proper operating state of the main motor and the main control unit. The auxiliary control module is operable to actuate the auxiliary motor when the auxiliary control module does not receive the reference signal.

Abstract: A system, device, assembly and methods for a frame assembly, including a connector as shown and described. The assembly may be a door frame assembly and may, by way of example, be a door jamb and/or a door mullion including a connector. A connector may provide stability to the assembly.

Abstract: An anti-graffiti window film covering system that includes multiple polymeric film layers. Each layer includes a unique visual indicia to identify the number of sheets remaining in the system.

Abstract: The present invention relates to an installation structure of a glass fixing gasket and a window glass panel fixing bracket, which fixes a window glass panel of a fixed window included in a sliding window system which comprises a segmented window frame and, more specifically, to an installation structure of a glass fixing gasket and a window glass panel fixing bracket, wherein the glass fixing gasket and the window glass panel fixing bracket are installed between a window frame portion which supports three sides (an upper surface, a lower surface, and one external side surface that is not a middle bar side surface) of a fixed window included in a sliding window and a window glass panel provided as a double-pane, in order to provide a sealing function for preventing ventilation and a function of stably fixing the window glass panel against high wind pressure (wind pressure resistance), and moreover, to ensure maximum heat insulation performance.

Abstract: The present invention relates to a method of producing a vacuum insulated glazing unit, the vacuum insulated glazing unit comprises a first tempered glass pane and a second tempered glass pane arranged in parallel, having a surface of each pane opposing each other with pillars arranged as spacers between the opposed surfaces. A side frit material is peripherally arranged between the first glass pane and the second glass pane creating an internal void between the glass panes. An evacuation opening is provided in the first glass pane and the evacuation opening comprises an evacuation member, preferably a hollow tube, through which evacuation member the internal void can be evacuated.

Abstract: A spacer includes a polymeric hollow profile, including a first and second side wall, a glazing interior wall connecting the side walls to one another; an outer wall arranged parallel to the glazing interior wall and connects the side walls to one another; a cavity surrounded by the side walls, the glazing interior wall, and the outer wall, a moisture barrier on the first side wall, the outer wall, and the second side wall, wherein the moisture barrier includes a multi-layer system having a barrier function including a polymeric layer and an inorganic barrier layer, a metallic or ceramic outer adhesive layer having a thickness of less than 100 nm, a binding layer between the adhesive layer and the multi-layer system and including a polymer selected from oriented propylene, oriented polyethylene terephthalate, biaxially oriented propylene, and biaxially oriented polyethylene terephthalate. The binding layer is directly adjacent the adhesive layer.

Abstract: A trim seal apparatus has a lengthwise body having a face surface and an opposite ribbed surface each spanning between a front surface and an opposite rear surface of the body and a lengthwise front flap extending at an angle in the direction of the ribbed surface from a location along the front surface that is at least midway between the face surface and the ribbed surface or that is closer to the ribbed surface than the face surface, in use when the body is installed on the door frame with the ribbed surface directly against the door frame the front flap is oriented toward and configured to make sealing contact against the door frame so as to seal the garage door opening between the body and the door frame.

Abstract: Hanging blinds includes an upper track and a plurality of sliders. The upper track has at least a first track and a second track respectively having a sliding slot. Each of sliders has a guiding groove and a positioning groove. A sliding block is disposed at an end of the positioning groove and enabling the slider to be mounted onto a guiding groove of an adjacent slider. Each slider is mounted onto one sliding slot of the first and second tracks. A last slider on the second track has at least two positioning blocks locking with an end of the second track. The sliders other than the last slider each has a pulley. The last slider on the first track has a crossing pulley slidably mounted in the sliding slot of the second track. The crossing pulley is disposed before a pulley of a first slider on the second track.