Abstract: Disclosed is a detergent additive box. The detergent additive box is a closed box structure having a cavity inside. The detergent additive box is provided with a one-way ventilation valve and a liquid outlet. An on-off valve is arranged on the liquid outlet. A suction device is arranged in the detergent additive box. An inlet of the suction device is communicated with the cavity, and an outlet of the suction device is communicated with an inlet of the on-off valve. The detergent additive box of the present disclosure cooperates with a switching mechanism of a washing machine and a feeding pipeline of the washing machine to realize automatic drainage and multi-time drainage, so that the detergent additive box does not need to be mounted at each time of washing.

Abstract: A multi-factor safe locking system for use in firearm storage, wherein the factors comprise a user's provided key, a user's biometric data, and a user's provided code. In some embodiments, the multi-factor safe locking system requires the near-simultaneous entry of two users, or dual consent of the two users to enter at least two unique keys, at least one form of biometric data from each user, and at least two unique codes, wherein each user supplies their own unique code to access the safe's contents. In further embodiments, a safe locking system includes a further factor of a result from a blood alcohol test.

Abstract: The present application proposes a laundry treating apparatus comprising: a cabinet; a drawer; a drum; a laundry inlet; a housing; a lever body; a body pressing portion; a magnetic field generator; a magnetic field sensor; a contact body; a slide wherein when an object contacts the contact body, the slide moves the free end of the lever body so that a distance between the magnetic field generator and the magnetic field sensor is equal to or smaller than a reference distance; and a door pivotably mounted on the top face of the drawer or a top face of the tub, wherein when the door pivots in a direction of opening the laundry inlet while the drawer is inserted into the cabinet, the door presses the body pressing portion such that a distance between the magnetic field generator and the magnetic field sensor is larger than the reference distance.

Abstract: Disclosed herein are lock assemblies that include, in particular embodiments, a cable assembly, a housing, a sensor assembly, and a wireless transceiver. The cable assembly includes a cable having a sensor element disposed along its length, a first shackle pin on its first end, and a second shackle pin on its opposing end. The housing defines a first pinway for receiving the first shackle pin, a second pinway for receiving the second shackle pin, and a locking mechanism for securing the shackle pins to the housing. The sensor assembly is located within the housing and in communication with the cable assembly for sensing a cable type and a cable condition related to the cable assembly. The wireless transceiver is connected to a power source, in communication with the sensor assembly, and operated by a microcontroller within the housing.

Abstract: An assembly is to be mounted on a drawer slide to provide dampening to a drawer for an enclosure. The enclosure includes a front wall having a cutout area with merging lower and side edges. The drawer slide includes a stationary member mounted to the enclosure and a sliding member attached to the drawer. The assembly includes; a dampening mechanism having front and rear ends, the dampening mechanism configured to prevent slamming of the drawer during closing and to maintain the drawer in a closed position, the dampening mechanism having a hook that engages an activator mounted on the drawer; a front mounting bracket attached to the front end of the dampening mechanism, the front mounting bracket configured to mount to and engage the side edge of the cabinet and the stationary member of the drawer slide; and a rear mounting bracket attached to the dampening mechanism rearwardly of the front mounting bracket, the rear mounting bracket configured to mount to and engage the stationary member of the drawer slide.

Abstract: A slide rail assembly includes a first rail, a second rail, a third rail, and a position-limiting member. The third rail is movably mounted between the first and the second rails. The second and the third rails can be displaced with respect to the first rail from a predetermined position in a first direction. When the second and the third rails are at the predetermined position with respect to the first rail, a first portion of the position-limiting member is adjacent to an end portion of the three rails, and a second portion of the position-limiting member prevents the three rails from separating from one another in a second direction substantially perpendicular to the first direction.

Abstract: A bracket assembly for a server to prevent tilting during transportation includes at least two cabinet columns and two brackets. The two brackets are spaced apart from each other. The at least two cabinet columns fixed on the two brackets. Each bracket includes a fixing portion, a supporting portion, and at least one protrusion. The supporting portion extends from an edge of the fixing portion toward the other bracket, the protrusion from the fixing portion is spaced apart from the supporting portion. The supporting portion and protrusion are disposed on a same side of the fixing portion. A bracket structure and server assembly includes the bracket assembly and a housing, each of two parallel sidewalls of the housing has a sliding groove to clamp the protrusions.

Abstract: A household appliance (10) is disclosed which comprises a liquid tank (12), wherein the tank is adapted for translational movement between a use position in which the tank is positioned within a housing (15) of the household appliance and a servicing position in which the tank is at least partially extracted from the housing, the household appliance further comprises biasing means (30) for biasing the tank towards the servicing position, and releasable latch means (36; 38; 58) for selectively arresting the tank in the use position or releasing the tank for movement towards the servicing position.

Abstract: An arrangement includes a drawer pull-out guide and a locking device for releasably locking a furniture part. The drawer pull-out guide includes a carcass rail to be fixed to a furniture carcass and an extension rail, the extension rail being displaceably supported between a fully closed position and a fully open position. The locking device includes a first locking component to be fixed to the furniture carcass, and a second locking component to be fixed to the extendably-supported furniture part. The first locking component and the second locking component can be releasably locked together, and the second locking component includes a base member and a locking element for releasably locking the first locking component. The locking element is pivotally supported on the base member, and the extension rail of the drawer pull-out guide can be releasably locked by the locking device in or immediately before the fully open position.

Abstract: A refrigerator that is capable of enabling a user to easily introduce or remove goods into or from the refrigerator is described. Specifically, a refrigerator that is capable of enabling a drawer for receiving goods to be more conveniently used is described.

Abstract: A support assembly includes a support surface configured to selectively transition between a stowed position, a deployed position, and an intermediate position defined between the stowed position and the deployed position. A retention feature is operably coupled to the support surface and is configured to transition the support surface between the stowed position and the deployed position. The retention feature includes a projection about which the support surface pivots to define a pivot axis. A bracket is coupled to the support surface and is configured to distribute a load along the support assembly in the intermediate position and the deployed position.

Abstract: A slide rail assembly includes a first rail, a second rail, a third rail, and a position-limiting member. The third rail is movably mounted between the first and the second rails. The second and the third rails can be displaced with respect to the first rail from a predetermined position in a first direction. When the second and the third rails are at the predetermined position with respect to the first rail, a first portion of the position-limiting member is adjacent to an end portion of the three rails, and a second portion of the position-limiting member prevents the three rails from separating from one another in a second direction substantially perpendicular to the first direction.

Abstract: An apparatus for humidifying a flow of pressurised, breathable air includes varying a first pressure of the flow of breathable gas to vary a level of thermal engagement between the conductive portion of the reservoir and the heater plate, varying a height of the variable portion varies a level of thermal engagement between the conductive portion of the reservoir and the heater plate, use of a humidifier reservoir base component with a maximum water capacity substantially equal to the predetermined maximum volume of water of the humidifier reservoir or the use of intersecting inlet and outlet axes.

Abstract: A surfboard with an electric drive (2), a battery for the electric drive (2), said battery being arranged in a battery housing (3), a first recess (4) for the battery housing (3), and a handle (5) on the battery housing (3), wherein the handle (5) is designed as a bracket handle which is mounted pivotably around a respective centre of rotation (21) at each of the handle ends on opposite sides (6) of the battery housing (3), and in each case a lug (9) protrudes from the base side of the recess below the centres of rotation (21) inside the first recess (4), and at each handle end of the bracket handle a second projection (33) is formed, which has a curved edge (34) and which rests on the lug, and a distance between a contact point of the curved edge (34) with the lug (9).

Abstract: Disclosed is a binder adapted palette that is easily attached or detached to or from a diary or notebook binder and thus is easily stored and carried together with the binder. The binder adapted palette includes a body having a palette accommodation groove defined in a top surface thereof and a plurality of through-holes defined and arranged along one edge thereof, wherein the plurality of through-holes receive a binder ring of the binder; a palette detachably inserted into the palette accommodation groove; and a cover coupled to a top of the body to open and close the palette.

Abstract: An assembly includes a bearing web for a drawer base of a drawer, and a holding device for a drive device for driving the drawer relative to a furniture body. The holding device has a securing element, by which the holding device can be secured to the bearing web. The bearing web includes a receiving area for the securing element and a bearing region for the drawer base adjacently to the receiving area. The securing element has a support surface that faces the drawer base in a secured state, and the holding device is secured to the bearing web. The support surface of the securing element and the bearing region of the bearing web form a substantially flat drawer base bearing surface for the drawer base in the secured state. The drawer base bearing surface can rest against the drawer base in a flush manner in the secured state.

Abstract: A full extension ball bearing drawer slide assembly comprised of a cabinet rail attached to a cabinet piece, an intermediate rail slidingly engaged with the cabinet rail via bearing runners, a drawer rail slidingly engaged with the intermediate rail via a bearing cage, and a cage hold forward device for advantageously positioning the bearing cage for ease of re-insertion of the drawer rail within the intermediated rail. The cage hold forward device is attached to the intermediate rail and comprises a protrusion for engagement with a flexible trigger mounted on the drawer rail and a flexible clip for releasable engagement with the bearing cage.

Abstract: A rail for guiding a carriage of a furniture door, in which the rail has at least one mounting part. The at least one mounting part can be fastened to a furniture part, which is formed by a side wall of a piece of furniture, and can be releasably connected to a guide part. The guide part has at least one guide for the carriage.

Abstract: A sliding rail positioning device includes a first rail, a second rail, and a third rail. The second rail includes a second body and a second holding member. The second body defines a first receiving hole. The third rail includes a third body and a third holding member. When the second body is driven by the first rail to slide out, the third holding member is biased toward the second body to be received in the first receiving hole, so that the second body cannot be retracted back. When the first rail is retracted, the first rail presses the second holding member to press the third holding member out of the first receiving hole so that the second body can be retracted.

Abstract: A non-permanent bracket assembly for a server cabinet which can hold a server only or a server and a power distribution unit includes a slide member and a fixing member. One end of the slide member can be mounted to a cabinet for supporting a server. The fixing member is detachably positioned at the other end of the slide member. The other end of the slide member is mounted to the cabinet through the fixing member, and the fixing member is further configured to fix a power distribution unit.

Abstract: A dish treating appliance for treating dishes according to an automatic cycle of operation can include a tub having at least a rear wall, a bottom wall, and a pair of opposing side walls. The tub at least partially defines a treating chamber with an access opening. A rail mounting assembly includes a pair of braces. Each of the braces are coupled with a different one of the opposing side walls. A rail assembly is mounted to each of the braces. A dish rack is slidingly mounted to the rail assemblies for movement in and out of the treating chamber relative to the access opening.

Abstract: A household appliance or commercial appliance includes a housing surrounding an interior and a support device removable from the interior and a rail system with at least two rails connected to one another and movable relative to one another, and a support element. When the support device is in an installed state, the rail system is mounted on the housing such that the support element is movable relative to the housing by pulling out the rail system. A locking unit arranged on the support device has at least one locking element that can be transferred between a blocking state and a free state. When the support device is in its removed state physically separated from the housing, the locking unit blocks the rail system from being pulled out. When the support device is in its installed state, the locking element allows the rail system to be pulled out.

Abstract: Dresser includes a frame having a front, a drawer slidable into and out of the frame, and a drawer retention mechanism between each side wall of the drawer and the frame alongside the side wall. The retention mechanism includes a track on the side wall defined between upper and lower parts, and a rail on the drawer movable in the track. A first stop is on the upper part and a second stop is on the drawer. The first and second stops are positioned to cause contact of a front surface of the second stop and rear surface of the first stop to prevent sliding of the drawer out of the frame and such that an angled rear surface of the second stop comes into contact with and slides over an angled front surface of the first stop during insertion of the drawer.

Abstract: A laundry apparatus including a cabinet; a first space provided in the cabinet, in which a first treating part provided to treat laundry is installed; a second space provided in the cabinet, in which a second treating part provided to treat laundry is installed; a drawer movably provided in the second space, in which the second treating part is installed; and a rail unit configured to limit vertical and horizontal movement of the drawer with respect to the second space and to guide the outward movement of the drawer. Therefore, laundry may be treated by using the first and second treating parts and vibration and noise generated in the second treating part may be reduced.

Abstract: A drawer pull-out guide includes at least two guide rails displaceably supported relative to one another, and at least one running carriage having load-transmitting rolling bodies. The running carriage is displaceably supported between the at least two guide rails, and the guide rails, upon a movement of the at least one running carriage, adopt a predefined relative position to one another, provided that no malposition of the guide rails to one another is present. A compensation device compensates for a malposition of the guide rails. The compensation device includes an actuating device to be actuated by one of the guide rails, and the actuating device compensates for the malposition upon an actuation. A switching device is provided for switching the actuating device of the compensation device out of engagement with the guide rail if the predefined relative position of the guide rails to another is present.

Abstract: Piece of furniture, such as a dresser, includes a frame having a front facing surface and a rear facing surface, rectangular drawers each insertable into and partly removable from the frame and at least one of which includes a vertically oriented front panel, rectangular side panels, a horizontal lower panel and a vertically oriented rear panel, and front, non-adjustable supports and rear, non-adjustable supports for supporting the frame on a horizontal surface. The rear supports have a lower height than the front supports. As such, a distance between a lowermost drawer and a rear of the frame is less than a distance between the lowermost drawer and a front of the frame when the lowermost drawer is fully inserted into the frame.

Abstract: A slide rail assembly includes a first rail, a second rail, a stop, and a working member. The second rail can be displaced with respect to the first rail. The stop is disposed on the first rail. The working member is movably mounted on the second rail. When reaching a predetermined position after being displaced with respect to the first rail from an extended position in a retracting direction, the second rail is blocked by the stop via the working member and is thus prevented from being displaced from the predetermined position in an opening direction. The slide rail assembly has a shorter length when the second rail is at the predetermined position than when the second rail is at the extended position.

Abstract: A slide rail assembly includes an inner rail, a middle rail slidably coupled to the inner rail, and an outer rail slidably coupled to the middle rail. The inner rail includes a first body and a latching member. The latching member extends from the first body to the middle rail. The middle rail includes a second body and a locking device. The locking device is fixedly coupled to the second body. The locking device defines a latching hole configured to receive the latching member so that the middle rail moves together with the inner rail relative to the outer rail to extend to a designated position and length of the slide rail assembly.

Abstract: A slide rail assembly includes a first rail, a second rail, a third rail, a synchronization device and a contact feature. The second rail is displaceable relative to the first rail. The third rail is displaceable relative to the second rail. The synchronization device is arranged on one of the second rail and the third rail. The contact feature is arranged on the other of the second rail and the third rail. The third rail and the second rail can synchronously displace relative to the first rail through the collaboration between the synchronization device and the contact feature.

Abstract: A slide rail assembly includes a first rail, a second rail, a third rail and a switch member. The second rail is movably mounted between the first rail and the third rail. The switch member is linearly movable and configured to be switched between a first state and a second state. When the switch member is in the second state, the second rail is configured to be driven by the third rail to move to a predetermined position along a retracting direction. When the third rail is moved relative to the second rail at the predetermined position along an extending direction, the switch member is configured to be switched from the second state to the first state.

Abstract: The present invention concerns a rolling body cage for a linear guide or telescopic rail having rail elements which are displaceable relative to each other, wherein the rolling body cage has at least one bottom portion extending in a longitudinal direction of the rolling body cage, side wall portions which are arranged parallel and which extend on mutually opposite sides of the bottom portion substantially perpendicularly therefrom and in which there are provided rolling body holding recesses for receiving and holding rolling bodies between the raceways of rail elements and at at least a first end of the rolling body cage a connecting bridge which extends between the side wall portions substantially perpendicularly thereto, wherein the bottom portion, the side wall portions and the connecting bridge are produced in one piece from a first plastic.

Abstract: A drive device for a movable furniture part includes an ejection force accumulator which can be tensioned, and an ejection element mechanically loaded by the ejection force accumulator and used to carry out an ejection movement of the moveable furniture part from a closed position into an open position. The ejection movement can be initiated by a compression movement of the movable furniture part into a compression position which is behind the closed position. The drive device also comprises a tensioning device for tensioning the ejection force accumulator with energy which can be emitted by the ejection movement. During the compression movement, at least 50% of the energy emitted by the ejection force accumulator during the ejection movement can be introduced into the ejection force accumulator by the tensioning device.

Abstract: A device for connecting a movable push element of a piece of furniture or a household appliance to a guide rail. According to the present invention, the device comprises a locking arm with a locking member, wherein in the mounted condition of the device the locking member is designed to be coupled with a locking element, wherein the elongated locking arm is connected by two spaced-apart elastic attachment members to the remainder of the device, which attachment members engage with the locking arm transversely to a longitudinal extension of the locking arm, so that the locking arm is movable in the region of the locking member in a direction transverse to the longitudinal extension of the locking arm and in the direction of the attachment members.

Abstract: A slide rail assembly includes a first rail, a second rail and a positioning device. The first rail includes a first structure and a second structure. The second rail is movable relative to the first rail. The positioning device is arranged to the second rail and includes an elastic member and a positioning member. The elastic member provides an elastic force to the positioning member. When the second rail is moved relative to the first rail from a first position to a second position, the positioning member is moved to an engaging position through the elastic force and abuts against the first structure. When the second rail is moved relative to the first rail from the second position to a third position, the positioning member is moved from the engaging position to a disengaging position and no longer abuts against the first structure by guidance of the second structure.

Abstract: A coin selector holder for a commercial home appliance is provided. The coin selector holder includes a body mounted on a control panel of the commercial home appliance and provided with a mounting groove opening, a first supporting arm arranged on a first side of the mounting groove opening and fastened to the control panel in a bending manner, and a second supporting arm, arranged on a second side of the mounting groove opening. After the first supporting arm is fastened on the control panel, the second supporting arm is clamped to the control panel, and is slideable along the control panel during the clamping process. A commercial appliance including the coin selector holder for the commercial home appliance is provided.

Abstract: A dishwasher with at least one guide rail. The guide rail can slidably couple a dish rack to a tub, where the tub defines at least a portion of a treating chamber. The dish rack can carry at least one wheel assembly that includes at least one wheel. The wheel can be contained in a wheel channel of the wheel assembly. The wheel channel can in part be defined by walls of the guide rail. A track closure can rotatably couple to the guide rail for the selective removal of the dish rack from the guide rail.

Abstract: A slide rail assembly includes a first rail, a second rail, and a bracket device. The second rail can be displaced with respect to the first rail. The bracket device is adjacent to the first rail and includes a bracket with an upper wall, a lower wall, a sidewall, and a first and a second extension section. The sidewall is connected between the upper and the lower walls. The first and the second extension sections extend from and are bent with respect to the upper and the lower walls respectively. The first rail is partially enclosed in a support channel defined by the upper wall, the lower wall, the sidewall, and the extension sections of the bracket.

Abstract: A slide rail assembly includes a first rail, a second rail, a third rail, a locking member, and an operating member. The second rail is displaceable with respect to the first rail from a first position to a second position. The third rail is displaceable with respect to the second rail. The locking member can prevent the second rail from displacement with respect to the first rail from the second position toward the first position when in a first state. The operating member can be operated in order to switch the locking member from the first state to a second state, in which the second rail is displaceable with respect to the first rail from the second position toward the first position.

Abstract: The disc device that includes a disc tray which stores a plurality of stacked discs, a tray carrier which transports the disc tray, and a disc selector which supplies one disc of the plurality of discs stacked on the disc tray to a drive unit. The disc selector includes a disc selector spindle that supports the plurality of discs, a disc press on which an upper surface of an uppermost disc of the plurality of discs supported by the disc selector spindle abuts, a displacement amount detection mechanism that detects a displacement amount of the disc press displaced according to thicknesses of the plurality of supported discs, and a thickness detection unit that detects a thickness of each of the plurality of discs based on the detected displacement amount of the disc press.

Abstract: A slide rail assembly includes a first rail, a second rail, a first locking mechanism, and a second locking mechanism. The second rail can be displaced with respect to the first rail. The first locking mechanism and the second locking mechanism are disposed at two different portions of the second rail respectively and can be locked to the first rail separately in order to keep the second rail at either of two predetermined extended positions. The first locking mechanism and the second locking mechanism can then be operated and thereby unlocked from the first rail so that the second rail can be retracted with respect to the first rail.

Abstract: A universal drawer slide is described. The drawer slide includes an outer slide member and an inner slide member that are configured to move between a closed position and an extended position. A lever is pivotally mounted to a front portion of the inner slide member. A cam mounts to the outer side member in at least a first position and a second position. An engaging end of the lever engages with the cam in either the first position or the second position.

Abstract: A self-retracting and damping device for a drawer element, having a first driver, which has a first driver fork for the engagement of an external activator and is guided in a displaceable manner in a first guide curve, and having a second driver, which is guided in a displaceable manner in a second guide curve. One of the drivers is coupled to a damping element and the other driver is coupled to an energy store. The two drivers are coupled to one another in part. The first driver is coupled to the energy store and the second driver is coupled to the damping element. In a first part of a retracting movement, the energy store and the damping element act on the external activator and, in a second part of the retracting movement, only the energy store acts on the external activator.

Abstract: A slide rail mechanism includes a first bracket and a second bracket. The first bracket is slidably coupled to the second bracket. The second bracket includes a second body and two second bent portions respectively extending toward each other from two longitudinal sides of the second body. A gap is defined between each second bent portion and the second body. The first bracket is slidably received in the gaps. The second bent portions limit a sliding direction of the first bracket relative to the second bracket. The first bracket is retracted or extended relative to the second bracket to adjust a combined length of the first bracket and the second bracket in a cabinet.

Abstract: A slide rail assembly includes a first rail, a second rail, a first structure, a second structure and a disengaging member. The disengaging member is arranged at a position on the second rail to be conveniently operated by a user. When the second rail is moved relative to the first rail to an extended position, the first structure and the second structure are configured to be engaged with each other, in order to hold the second rail at the extended position. Wherein, the disengaging member is configured to disengage the first structure from the second structure.

Abstract: A rail clamp latch holder is provided. The rail clamp latch holder includes a grippable portion and a rail portion disposed at a forward side of the grippable portion. The rail portion includes first and second pairs of opposed latches which are configured to latch onto a rail and which are disposed at first and second longitudinal ends of the rail portion, respectively, a tab, a locking pin and an elastic member. The tab is insertable into a rail latch. The elastic member extends along a longitudinal axis of the rail portion and elastically couples the locking pin and the tab.

Abstract: A bracket device adapted to a slide rail mechanism is disclosed. The bracket device includes a first supporting frame, a second supporting frame and a bracket. The second supporting frame is movable relative to the first supporting frame. The bracket includes a side wall and at least one mounting member arranged adjacent to the side wall. Herein, the first supporting frame and the second supporting frame are able to be engaged with each other through a first structure and a second structure, in order to be moved simultaneously from a first position along a direction.

Abstract: A retracting mechanism for first and second furniture parts includes a guiding structure, a catch member, and a resilient member. The first furniture part includes an engaging feature. The catch member is displaceable between first and second guiding portions of the guiding structure and includes first and second features. While the second furniture part is displaced in a certain direction with respect to the first furniture part, with the catch member initially at the first guiding portion and with the engaging feature caught by one of the first and second features, the catch member is disengaged from the engaging feature such that the resilient member stores a force for assisting in retracting the second furniture part with respect to the first furniture part.

Abstract: The invention relates to a pull-out guide, in particular for a domestic appliance or a piece of furniture, comprising a stationary guide rail and a running rail which is movably mounted on the guide rail. A damping device comprising a fluid damper which acts on one side is provided on the guide rail, said fluid damper having a damper housing and a piston rod which can be pushed into and drawn out of the damper housing. A first activator acts on the damping device shortly before reaching a closed position during a closing movement of the running rail in order to brake the movement of the running rail. A second activator acts on the damping device shortly before reaching the maximum open position during an opening movement of the running rail in order to brake the movement of the running rail. The pull-out guide is preferably used in a domestic appliance, in particular in a dishwasher.

Abstract: A mounting apparatus using a sliding mechanism for easy insertion and removal of insertable units includes a supporting bracket and a sliding mechanism. The sliding mechanism includes an outer rail, a middle rail, an inner rail, a latching unit, and a locking unit. The latching unit includes first and second guiding portions on the inner rail, first and second positioning members slidably mounted to the middle rail, and third and second guiding portions on the outer rail. The locking unit includes a locking member at end of the inner rail and a locking portion on the middle rail to correspond to the locking member.

Abstract: A slide rail assembly includes a first rail, a second rail, a third rail, a synchronization member and a fastening member. The third rail is movably mounted between the first and second rails. The synchronization member and the fastening member are movably mounted to the third rail. The synchronization member is configured to engage with the second rail, such that the second and third rails can be synchronously moved relative to the first rail along an opening direction. When the second and third rails are moved to a first predetermined position, the synchronization member is disengaged from the second rail. When the third rail is moved from the first predetermined position to a second predetermined position along the opening direction, the third rail is fastened to the first rail by the fastening member to prevent the third rail from being moved relative to the first rail along a retracted direction.