Multi-section guide rail

Abstract

The utility model relates to a multi-section guide rail, which comprises a middle rail, a middle rail and a middle rail, wherein the middle rail is provided with a second guide groove extending along the length direction; the inner rail can stretch forwards in the second guide groove and is provided with a third guide groove extending in the length direction; comprising a blocking piece and a clamping piece, and the blocking piece is arranged in the second guide groove in a protruding mode and is close to the front end of the middle rail. The clamping piece is rotationally arranged in the third guide groove, is close to the rear end of the inner rail and is provided with a limiting groove opposite to the blocking piece; and along with the rotation of the clamping piece, the limiting groove is clamped with or separated from the blocking piece. According to the multi-section guide rail, the blocking piece which is simple in structure is designed to be matched with the limiting groove in a clamped mode, the inner rail is locked when being pulled out to the longest length, the inner rail is kept in a stable stretching working state, locking can be relieved only by rotating the clamping piece to enable the blocking piece to be separated from the limiting groove, and the unlocking step is simple.

Description

TECHNICAL FIELD

[0001] The utility model relates to guide rail technical field, in particular to a multi -section guide rail. BACKGROUND

[0002] Multi -section guide rail is widely used in industry, commercial and civilian drawer, pull basket, tray, showcase etc., and gradually extends use to IT, telecommunication, bank etc. industry. The commonly used three section ball guide rail is mainly composed of outer rail, middle rail, inner rail sliding assembly. Outer rail and middle rail, middle rail and inner rail are respectively separated by ball and sliding support, under the action of pulling or pushing, mutually slide, freely unfold. However, if the guide rail cannot be locked, each section guide rail can freely slide during work, which brings inconvenience to users, especially in the application of bearing field, which easily causes safety accidents, resulting in the existence of limited use range.

[0003] In the prior art, in order to keep the multi -section guide rail stable in the extension state during extension work, the spring and lock head combination mode are usually used to lock each section guide rail. However, the conventional lock head structure is complex, manufacturing is troublesome, cost is high, which is not conducive to large -scale production and use of multi -section guide rail, and the unlocking operation of the lock head is not convenient, which affects the user's experience. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model aims at providing a multi -section guide rail.

[0005] A multi -section guide rail, comprising: middle rail, being provided with second guide groove extending along the length direction;Inner rail, which can be telescoped forward in the second guide groove, is provided with third guide groove extending along the length direction;Second locking assembly, comprising blocking piece and clamping piece, the blocking piece is protruding in the second guide groove and close to the front end of the middle rail;The clamping piece is rotatably arranged in the third guide groove and close to the rear end of the inner rail, and the limiting slot capable of being opposite to the blocking piece is opened;With the rotation of the clamping piece, the limiting slot and the blocking piece are engaged or separated.

[0006] The multi -section guide rail of the utility model is locked when the inner rail is pulled out to the longest length by designing the simple structure of the blocking piece and the limiting slot, which keeps the stable extension working state, and only needs to rotate the clamping piece to separate the blocking piece and the limiting slot to release the locking, and the unlocking step is simple.

[0007] Further, the second locking assembly further comprises a first elastic member, one end of the first elastic member is connected with the clamping piece, and the other end is abutted with the inner side of the second guide groove, so as to push the limiting slot to the blocking piece.

[0008] Through the technical scheme, the clamping part is reset under the elastic force of the first elastic part, rotates around the first connecting shaft, and makes the blocking part enter the limiting slot to lock the inner rail.

[0009] Further, the multi-section guide rail further comprises an unlocking assembly, the unlocking assembly comprises a handle and a connecting piece, the handle is rotationally arranged in the third guide slot and at least a part of the handle extends outside the front end of the third guide slot, and the connecting piece is arranged in the third guide slot, one end of the connecting piece is connected with the handle, and the other end of the connecting piece is connected with the clamping part.

[0010] When the handle rotates, the clamping part can be pulled to rotate by the connecting piece, so that the blocking part is separated from the limiting slot.

[0011] Through the technical scheme, the user rotates the handle, the clamping part is pulled to rotate by the connecting piece, so that the blocking part is separated from the limiting slot, and the locking of the inner rail is released.

[0012] Further, the multi-section guide rail further comprises an unlocking assembly, the unlocking assembly comprises a handle and a connecting piece, the handle is rotationally arranged in the third guide slot and at least a part of the handle extends outside the front end of the third guide slot, and the connecting piece is arranged in the third guide slot, one end of the connecting piece is connected with the handle, and the other end of the connecting piece is connected with the clamping part.

[0013] The first locking assembly comprises a protrusion and a swing part, the protrusion protrudes in the first guide slot, and the swing part is rotationally arranged in the second guide slot; along with the rotation of the swing part, the protrusion can abut against the swing part or pass through the swing part.

[0014] Through the technical scheme, a three-section multi-section guide rail is formed, and the application occasions are wider, and when the middle rail is retracted to the longest length in the first guide slot, the protrusion can abut against the swing part to lock the middle rail.

[0015] Further, the swing part comprises an axis end and a swing end located at two ends in the length direction respectively, the axis end is connected with the second guide slot, and a second sliding slot is formed in the side of the swing end facing the first guide slot; a through slot is formed in the second guide slot, and at least a part of the swing part can pass through the through slot and abut against the protrusion.

[0016] Through the technical scheme, when the protrusion abuts against the swing part, the middle rail is locked and prevented from retracting, and when the protrusion passes through the second sliding slot, the locking of the middle rail is released.

[0017] Further, guide inclined surfaces are connected between the two outer sides of the axis end and the swing end respectively, and the distance between the two guide inclined surfaces gradually increases in the direction from the axis end to the swing end.

[0018] When the inner rail is retracted in the second guide slot, the inner side wall of the third guide slot meets the guide slope, pushing the swing member to rotate and enter the third guide slot.

[0019] By the above technical solution, the swing member is restored to the state that the width direction upper and lower sides are parallel to the upper and lower protrusions, so that the protrusions can pass through the second sliding slot, and the locking of the middle rail is released.

[0020] Further, the multi-section guide rail further comprises a sliding assembly, the sliding assembly comprises a bead strip and a rolling ball, the bead strip is laid between the inner side wall of the first guide slot and the outer side wall of the second guide slot and / or between the inner side wall of the second guide slot and the outer side wall of the third guide slot along the length direction; the rolling ball is embedded on the bead strip and rolls along the length direction.

[0021] By the above technical solution, the sliding between the outer rail and the middle rail and the middle rail and the inner rail is more flexible, the sound is smaller, and wear is less likely to occur.

[0022] Further, the first guide slot is provided with a first blocking portion protruding into the first guide slot; the rear end of the second guide slot is provided with a third blocking portion protruding outward from the second guide slot;

[0023] One end of the sliding assembly between the outer rail and the middle rail in the length direction can abut against the first blocking portion, and the other end can abut against the third blocking portion.

[0024] By the above technical solution, when the middle rail is pulled outwards, the first blocking portion and the third blocking portion abut against the two ends of the sliding assembly between the outer rail and the middle rail respectively, avoiding the middle rail from sliding out of the front end of the outer rail.

[0025] Further, the second guide slot is provided with a second blocking portion protruding into the second guide slot; the third guide slot is provided with a fourth blocking portion protruding outward from the third guide slot;

[0026] One end of the sliding assembly between the middle rail and the inner rail in the length direction can abut against the second blocking portion, and the other end can abut against the fourth blocking portion.

[0027] By the above technical solution, when the inner rail is pulled outwards, the second blocking portion and the fourth blocking portion abut against the two ends of the sliding assembly between the middle rail and the inner rail respectively, avoiding the inner rail from sliding out of the front end of the middle rail.

[0028] Further, a plurality of mounting holes are formed on the plate surface of the outer rail, and the mounting holes penetrate the outer rail.

[0029] By the above technical solution, it is convenient for the user to install the self-locking guide rail to the drawer wall or the like. Attached Figure Description

[0030] Figure 1 A schematic diagram of the structure of the multi-segment guide rail provided by this utility model when it is in a stretched state, projected along the direction perpendicular to the surface of the outer rail main plate.

[0031] Figure 2 for Figure 1 A partial sectional view along the AA direction;

[0032] Figure 3 A schematic diagram of the spatial structure of the outer rail provided by this utility model;

[0033] Figure 4 A schematic diagram of the spatial structure of the middle track provided by this utility model;

[0034] Figure 5 A schematic diagram of the spatial structure of the first locking component provided by this utility model when it locks the middle rail;

[0035] Figure 6 A schematic diagram of the spatial structure of the inner rail provided by this utility model;

[0036] Figure 7 A schematic diagram of the spatial structure when the inner rail is slidably set inside the middle rail, as provided by this utility model;

[0037] Figure 8 A schematic diagram of the spatial structure of the second locking component provided by this utility model when it locks the inner rail;

[0038] Figure 9 A schematic diagram of the spatial structure of the sliding component provided by this utility model;

[0039] Figure 10 A schematic diagram of the spatial structure of the swing component provided by this utility model. Detailed Implementation

[0040] To address the deficiency in existing multi-segment guide rails regarding the lack of a simple and convenient locking device, the inventor provides a multi-segment guide rail that utilizes cooperating protrusions and swinging components, as well as blocking components and limiting grooves. When the middle and inner rails are extended to their limit positions, they are locked respectively, preventing retraction and maintaining a stable extended state. Simultaneously, by turning the handle, the connecting component drives the locking component to rotate, causing the blocking component to disengage from the limiting groove, releasing the lock on the inner rail. Furthermore, during the retraction of the inner rail, the protrusion disengages from the swinging component, releasing the lock on the middle rail. The unlocking process is convenient and quick. The following is a specific embodiment of the multi-segment guide rail provided by this utility model:

[0041] like Figure 1 As shown, the projection is along a direction perpendicular to the surface of the outer rail 1, with...Figure 1 The up-down direction in the figure is the length direction, i.e. the opening and closing direction of the drawer, the left-right direction is the width direction, i.e. the up-down direction of the drawer, and the upper end of the outer rail 1, the middle rail 2 and the inner rail 3 in the length direction is the rear end away from the drawer opening, and the lower end is the front end close to the drawer opening.

[0042] Please refer to Figures 1 to 10 , Figure 1 The structure schematic view of the multi-section guide rail in the stretching state according to the present application is shown in the figure. Figure 2 The figure is Figure 1 The partial sectional view of the A-A direction in the figure. Figure 3 The space structure schematic view of the outer rail according to the present application is shown in the figure. Figure 4 The space structure schematic view of the middle rail according to the present application is shown in the figure. Figure 5 The space structure schematic view of the first locking assembly when locking the middle rail according to the present application is shown in the figure. Figure 6 The space structure schematic view of the inner rail according to the present application is shown in the figure. Figure 7 The space structure schematic view of the inner rail when slidingly arranged in the middle rail according to the present application is shown in the figure. Figure 8 The space structure schematic view of the second locking assembly when locking the inner rail according to the present application is shown in the figure. Figure 9 The space structure schematic view of the sliding assembly according to the present application is shown in the figure. Figure 10 The space structure schematic view of the swinging member according to the present application is shown in the figure.

[0043] The present application provides a multi-section guide rail, which comprises an outer rail 1, a middle rail 2, an inner rail 3, a sliding assembly 4, a first locking assembly 5, a second locking assembly 6 and an unlocking assembly 7. The outer rail 1, the middle rail 2 and the inner rail 3 are usually roll-formed by using alloy material and are sequentially sleeved. The sliding assembly 4 is arranged between the outer rail 1 and the middle rail 2 and between the middle rail 2 and the inner rail 3, respectively. When the middle rail 2 is pulled out from the outer rail 1 to the limit position, the first locking assembly 5 locks the middle rail 2 to prevent the middle rail 2 from retreating; when the inner rail 3 is pulled out from the middle rail 2 to the limit position, the second locking assembly 6 locks the inner rail 3 to prevent the inner rail 3 from retreating. The unlocking assembly 7 is mechanically connected with the second locking assembly 6 and is used for unlocking the second locking assembly 6; the first locking assembly 5 is unlocked when the inner rail 3 retreats.

[0044] Please refer to Figure 1 and Figure 3The outer rail 1 comprises a first guide slot 10, an outer rail body 11, a first side extension 12, a first stop block 13, a first blocking part 14 and a mounting hole 15. Specifically, the outer rail body 11 is a long strip-shaped plate member extending along the length direction, and the side close to the middle rail 2 is an inner plate surface, and the side away from the middle rail 2 is an outer plate surface. The two sides of the outer rail body 11 in the width direction are provided with the first side extension 12 through a flanging process, and the first side extension 12 is protruded to the inner plate surface of the outer rail 1 in a direction perpendicular to the inner plate surface of the outer rail 1. The first guide slot 10 is formed by the two first side extensions 12. The first stop block 13 is protruded to the inner plate surface of the outer rail 1 in a direction perpendicular to the inner plate surface of the outer rail 1 at the rear end of the first guide slot 10. When the middle rail 2 is withdrawn to the limit position at the rear end, the first stop block 13 abuts against the rear end of the middle rail 2 to limit the middle rail 2, preventing the middle rail 2 from being pulled out from the rear end of the outer rail 1. The first blocking part 14 is arranged on the upper and lower sides of the front end of the outer rail 1 and is formed by flanging and bending a part of the first side extension 12 inward the first guide slot 10. In the width direction, the distance between the two first blocking parts 14 is smaller than the distance between the two sliding assemblies 4 located between the outer rail 1 and the middle rail 2. When the middle rail 2 is pulled out to the limit position at the front end from the outer rail 1, the first blocking part 14 abuts against the sliding assembly 4 to limit the sliding assembly 4, preventing the sliding assembly 4 from being pulled out from the front end of the outer rail 1. The mounting hole 15 penetrates through the outer rail body 11, and the self-locking guide rail can be fixed on the wall of the drawer or the wall (not shown in the figure) through the cooperation of the mounting hole 15 and the screw.

[0045] Please refer to Figure 1 and Figure 4The middle rail 2 is slidingly arranged in the first guide slot 10, and comprises a second guide slot 20, a middle rail body 21, a second side extension 22, a second stop block 23, a second blocking portion 24, a third blocking portion 25, and a first sliding slot 26. Specifically, the middle rail body 21 is a long strip-shaped plate member extending along the length direction, and the plate surface thereof is parallel to the plate surface of the outer rail body 11. The inner plate surface of the middle rail body 21 is close to the inner rail 3, and the outer plate surface thereof is close to the outer rail body 11. The upper and lower sides of the middle rail body 21 in the width direction are provided with the second side extensions 22 through a flanging process. The second side extensions 22 are protruded from the inner plate surface of the middle rail 2 in a direction perpendicular to the inner plate surface. The second guide slot 20 is formed between the two second side extensions 22. The second stop block 23 is protruded from the inner plate surface of the middle rail body 21 and located at the rear end of the second guide slot 20. When the inner rail 3 is retracted to the limit position at the rear end, the second stop block 23 abuts against the rear end of the inner rail 3 to limit the position of the inner rail 3, thereby preventing the inner rail 3 from being pulled out from the rear end of the middle rail 2. The second blocking portion 24 is arranged on the upper and lower sides of the front end of the middle rail 2 in the width direction, and is formed by flanging and bending a part of the second side extension 22 inwardly into the second guide slot 20. In the width direction, the distance between the two second blocking portions 24 is smaller than the distance between the two sliding assemblies 4 located between the middle rail 2 and the inner rail 3. When the inner rail 3 is pulled out to the limit position at the front end of the middle rail 2, the second blocking portion 24 abuts against the sliding assembly 4 to limit the position of the sliding assembly 4, thereby preventing the sliding assembly 4 from being pulled out from the front end of the middle rail 2. The third blocking portion 25 is arranged on the upper and lower sides of the rear end of the middle rail 2, and is formed by flanging and bending a part of the second side extension 22 outwardly away from the second guide slot 20. In the width direction, the distance between the two third blocking portions 25 is greater than the distance between the two sliding assemblies 4 located between the outer rail 1 and the middle rail 2. When the middle rail 2 is pulled out to the limit position at the front end of the outer rail 1, the third blocking portion 25 abuts against the sliding assembly 4 to limit the position of the sliding assembly 4. Through the limiting cooperation of the first blocking portion 14, the third blocking portion 25, and the sliding assembly 4 located between the outer rail 1 and the middle rail 2, the middle rail 2 is prevented from being pulled out from the front end of the outer rail 1. The first sliding slot 26 is concavely arranged on the outer plate surface of the middle rail 2 and extends along the length direction. After the middle rail 2 is placed into the first guide slot 10 of the outer rail 1, the two first side extensions 12 and the two second side extensions 22 are oppositely arranged and leave a gap for placing the sliding assembly 4 therebetween.

[0046] Please refer to Figure 1 and Figure 6The inner rail 3 is slidably disposed within the second guide groove 20, and includes a third guide groove 30, an inner rail body 31, a third side extension 32, a first connecting shaft 33, a second connecting shaft 34, and a fourth blocking part 35. Specifically, the inner rail body 31 is a long strip-shaped plate extending along the length direction, its plate surface being parallel to the plate surface of the outer rail body 11, with the side closer to the middle rail 2 being the inner plate surface and the side farther from the middle rail 2 being the outer plate surface. The upper and lower sides of the inner rail body 31 in the width direction are provided with third side extensions 32 by a flange process, the third side extensions 32 protruding from the inner plate surface of the inner rail 3 and extending along the direction close to the middle rail 2. The two third side extensions 32 enclose each other to form a third guide groove 30. The first connecting shaft 33 and the second connecting shaft 34 protrude from the inner plate surface of the inner rail 3 and extend along the direction close to the middle rail 2, the first connecting shaft 33 being close to the rear end of the inner rail 3 and the second connecting shaft 34 being close to the front end of the inner rail 3. The fourth blocking part 35 is disposed on the upper and lower sides of the rear end of the inner rail 3, and is formed by bending a portion of the third side extension 32 outward towards the third guide groove 30. In the width direction, the distance between the two fourth blocking parts 35 is greater than the distance between the two sliding components 4 located between the middle rail 2 and the inner rail 3. When the inner rail 3 is pulled out to the left from the middle rail 2 to the limit position of the front end, the fourth blocking part 35 abuts against the sliding component 4 to limit it. Through the limiting cooperation of the second blocking part 24, the fourth blocking part 35 and the sliding component 4 located between the middle rail 2 and the inner rail 3, the inner rail 3 is prevented from coming off the front end of the middle rail 2. After the inner rail 3 is placed into the second guide groove 20 of the middle rail 2, the second side extension 22 and the third side extension 32 on the upper and lower sides are respectively arranged opposite each other, and a gap is left between them for placing the sliding component 4.

[0047] Please refer to the reference. Figure 1 and Figure 9The sliding assembly 4 comprises a pearl strip 41 and a ball 42 in the prior art, the pearl strip 41 is laid between the first side extension 12 and the second side extension 22 and between the second side extension 22 and the third side extension 32 along the length direction. A plurality of pearl holes (not marked in the figure) are arranged along the length direction between the pearl strips 41, the ball 42 is rollably embedded in the pearl holes, the diameter of the ball 42 is slightly larger than the outer diameter of the pearl strip 41, and the ball 42 is connected between the first side extension 12 and the second side extension 22 and between the second side extension 22 and the third side extension 32 respectively. When the drawer is opened, under the action of friction, the sliding assembly 4 moves with the middle rail 2 or the inner rail 3 in the length direction until one end thereof abuts against the first blocking part 14 or the second blocking part 24, and at the same time, the third blocking part 25 or the fourth blocking part 35 abuts against the other end of the sliding assembly 4 while the middle rail 2 or the inner rail 3 continues to move in the length direction, at this time, the middle rail 2 or the inner rail 3 is pulled out to the limit position of the front end. In addition, the arrangement of the ball 42 makes the relative movement between the outer rail 1 and the middle rail 2 and between the middle rail 2 and the inner rail 3 more flexible, and the sound emitted during movement is smaller. The rolling friction of the ball 42 replaces the original sliding friction, the friction during movement is smaller, so that the first side extension 11, the second side extension 21 and the third side extension 32 are not easy to wear, thereby improving the service life of the self-locking guide rail.

[0048] Please refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 10The first locking assembly 5 includes a protrusion 51, a rotating shaft 52 and a swing member 53. The protrusion 51 is arranged in the first guide slot 10 and protrudes from the inner plate surface of the outer rail body 11 and is located in the first sliding slot 25. When the middle rail 2 moves freely in the first guide slot 10, the protrusion 51 can move freely relative to the first sliding slot 26. The rotating shaft 52 protrudes in the second guide slot 20 and extends away from the inner plate surface of the middle rail 2. The swing member 53 is sleeved on the rotating shaft 52 and can rotate around the rotating shaft 52. The swing member 53 includes an axis end 531 and a swing end 532 at two ends respectively, and the swing end 532 is close to the rear end of the second guide slot 20. The axis end 531 is provided with a first shaft hole 5311, and the rotating shaft 52 is inserted into the first shaft hole 5311. The axis end 531 is further provided with guide inclined surfaces 5312 on the upper and lower sides in the width direction. The distance between the two guide inclined surfaces 5312 gradually increases from the direction of the axis end 531 to the swing end 532. The swing end 532 is provided with fifth blocking portions 5321 on the upper and lower sides in the width direction. The fifth blocking portions 5321 extend toward the inner plate surface of the middle rail body 21, and the second sliding slot 5322 matched with the protrusion 51 is formed between the two fifth blocking portions 5321. The middle rail 2 is provided with a through slot 27, and at least a part of the third blocking portion 5321 is inserted into the through slot 27 and can swing in the through slot 27, so that the fifth blocking portion 5321 is inclined relative to the second side edge extension 22. The fifth blocking portion 5321 passes through the through slot 27 and enters the first sliding slot 26 to abut against the protrusion 51, so that the middle rail 2 cannot move relative to the outer rail 1.The width between the upper and lower outer sides of the swing end 532 in the width direction is substantially equal to the width of the inner side of the third guide groove 30. When the inner rail 3 is retracted to the right to the limit position, i.e. the rear end of the inner rail 3 is close to the second stop block 22, the end of the third side edge extension 32 abuts against the guide slope 5312, and pushes the swing piece 53 to rotate around the rotation shaft 52, so that it enters the third guide groove 30, and the upper and lower sides of the swing end 532 in the width direction abut against the inner surfaces of the two third side edge extensions 32 respectively. At this time, the second sliding groove 5322 is parallel to the upper and lower sides of the protrusion 51, the protrusion 51 can pass through the second sliding groove 5322, and freely move in the first sliding groove 26. At this time, the middle rail 2 can freely move relative to the outer rail 1. When the middle rail 2 is pulled out to the left from the outer rail 1 to the limit position, the protrusion 51 passes through the second sliding groove 5322 and is located on the retreat path of the middle rail 2, then the inner rail 3 is pulled out to the left from the middle rail 2, the swing piece 53 is out of the third guide groove 30, and rotates around the rotation shaft 52 under the action of gravity, so that the second sliding groove 5322 is not parallel to the upper and lower sides of the protrusion 51. At this time, the protrusion 51 abuts against the fifth stop portion 5321 for limiting, and the middle rail 2 is locked, so that the middle rail 2 cannot retreat to the right. When it is needed to retract the middle rail 2 to the right, the inner rail 3 is retracted to the right, the end of the third side edge extension 32 abuts against the guide slope 5312, and pushes the swing piece 53 to rotate around the rotation shaft 52, so that it enters the third guide groove 30. The fifth stop portion 5321 is out of the abutting state with the protrusion 51, so that the second sliding groove 5322 is parallel to the upper and lower sides of the protrusion 51. The protrusion 51 can pass through the second sliding groove 5322, so that the middle rail 2 can be unlocked and retracted to the right.

[0049] Preferably, the right side of the protrusion 51 in the length direction is provided with an arc surface 511. When the protrusion 51 is located in front of the swing piece 53 and the middle rail 2 is pulled out, the third stop portion 53 abuts against the arc surface 511, the swing piece 53 rotates around the rotation shaft 52 under the guidance of the arc surface 511, so that the second sliding groove 5322 is parallel to the upper and lower sides of the protrusion 51 in the width direction. The protrusion 51 passes through the second sliding groove 5322, so that the protrusion 51 does not block the middle rail 2 from being pulled out when the swing piece 53 rotates under the action of gravity.

[0050] Please refer to Figure 6 , Figure 7 and Figure 8The second locking assembly 6 is arranged in the third guide slot 30 and comprises a blocking piece 61, a clamping piece 62 and a first elastic piece 63. Specifically, the blocking piece 61 is protruded on the inner plate surface of the middle rail body 21 and extends towards the inner rail 3 near the front end of the middle rail 2. The clamping piece 62 is sleeved on the first connecting shaft 33 and can rotate around the first connecting shaft 33. A limiting slot 621 is arranged on the side of the clamping piece 62 close to the blocking piece 61 in the width direction, and the limiting slot 621 is a semi-closed structure with an opening close to the blocking piece 61. When the clamping piece 62 rotates around the first connecting shaft 33, the blocking piece 61 enters or leaves the limiting slot 621. When the blocking piece 61 enters the limiting slot 621, it abuts against both sides of the limiting slot 621 in the length direction to lock the inner rail 3 and prevent the inner rail 3 from retreating. When the blocking piece 61 leaves the limiting slot 621, the locking of the inner rail 3 is released, and the inner rail 3 can move freely in the second guide slot 20. The first elastic piece 63 is a return spring and is substantially U-shaped in this embodiment. One end of the first elastic piece 63 is connected to the clamping piece 62, and the other end is connected to the third side edge extension 32. When the clamping piece 62 is not restricted by other components, under the elastic force of the first elastic piece 63, the clamping piece 62 rotates around the first connecting shaft 33, so that the blocking piece 61 enters and is clamped in the limiting slot 621 to lock the inner rail 3.

[0051] The unlocking assembly 7 is arranged in the third guide slot 30 and close to the front end in the length direction, and is used to drive the clamping part 62 to rotate around the first connecting shaft 33. The unlocking assembly 7 comprises a handle 71, a second elastic part 72 and a connecting part 73. The handle 71 comprises a rotating end 711 and a handle end 712. The rotating end 711 is sleeved on the second connecting shaft 34 and can rotate around the second connecting shaft 34. The handle end 712 extends out of the inner rail 3 and is used for a user to rotate the handle 71. The second elastic part 72 is a torsion spring. The winding of the second elastic part 72 is sleeved on the second connecting shaft 34. One end of the second elastic part 72 is connected with the handle 71, and the other end of the second elastic part 72 is connected with the third side edge extension 32. Initially, under the torsion of the second elastic part 72, the upper side of the rotating end 711 abuts against the inner surface of the third side edge extension 32 on the upper side of the inner rail 3. The connecting part 73 is a rigid part such as a connecting rod or a steel wire, which extends in the length direction. One end of the connecting part 73 is connected with the clamping part 62, and the other end of the connecting part 73 is connected with the rotating end 711. When the user rotates the handle 71, the rotating end 711 rotates around the second connecting shaft 34, and the connecting part 73 is pulled to move away from the blocking part 61. The pulling force of the connecting part 73 drives the clamping part 62 to rotate around the first connecting shaft 33, so that the blocking part 61 is separated from the limiting slot 621, and the locking of the inner rail 3 is released. When the user releases the handle 71, under the torsion of the second elastic part 72, the rotating end 711 reversely rotates around the second connecting shaft 34. The pulling force of the connecting part 73 on the clamping part 62 disappears. Under the elastic force of the second elastic part 63, the clamping part 62 rotates around the first connecting shaft 33, so that the blocking part 61 enters the limiting slot 621 and abuts against both sides of the limiting slot 621 in the length direction, thereby locking the inner rail 3. In the embodiment, first connecting holes (not marked in the figure) and second connecting holes (not marked in the figure) are respectively arranged in the clamping part 62 and the rotating end 711. When projected in the direction perpendicular to the plate surface of the inner rail body 31, the first connecting holes and the second connecting holes are located on the same side of the first connecting shaft 33 in the width direction.

[0052] The working principle of the multi-section guide rail is as follows: the middle rail 2 and the inner rail 3 are respectively pulled out to the longest length, that is, the first blocking part 14 and the third blocking part 25 respectively abut against both ends of the length direction of the sliding assembly 4 located between the outer rail 1 and the middle rail 2, and the second blocking part 24 and the fourth blocking part 35 respectively abut against both ends of the length direction of the sliding assembly 4 located between the middle rail 2 and the inner rail 3, at this time, the protruding block 51 is located on the backtracking path of the middle rail 2 and abuts against the fifth blocking part 5321 to prevent the middle rail 2 from backtracking, and the blocking piece 61 enters the limiting groove 621 and abuts against both sides of the length direction of the limiting groove 621 to prevent the inner rail 3 from backtracking. When the middle rail 2 and the inner rail 3 need to be retracted, the handle 71 is rotated, the clamping piece 62 is pulled to rotate around the first connecting shaft 33 through the connecting piece 73, so that the blocking piece 61 is separated from the limiting groove 621, and the locking of the inner rail 3 is released; meanwhile, in the backtracking process of the inner rail 3, the third side edge extension 32 abuts against the end of the guide inclined surface 5312 and pushes the swing piece 53 to rotate into the third guide groove 30, so that the fifth blocking part 5321 is separated from the protruding block 51, the protruding block 51 passes through the second sliding groove 5322, the locking of the middle rail 2 is released and the middle rail 2 is backtracked to the right.

[0053] Compared with the prior art, the multi-section guide rail has the following advantages:

[0054] (1) When the multi-section guide rail is in the extended state, the first locking assembly 5 and the second locking assembly 6 respectively lock the middle rail 2 and the inner rail 3, so that the middle rail 2 and the inner rail 3 will not backtracking and shrink under force when working, and the stable working state is maintained.

[0055] (2) The user only needs to rotate the handle 71, pull the clamping piece 62 to rotate through the connecting piece 73, so that the blocking piece 61 is separated from the limiting groove 621, the locking of the inner rail 3 is released, and in the backtracking process of the inner rail 3, the swing piece 53 is pushed to rotate around the rotating shaft 52, so that the protruding block 51 is separated from the fifth blocking part 5321 and passes through the second sliding groove 5322, the locking of the middle rail 2 is released, and the unlocking mode is simple and convenient.

[0056] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, and the utility model also intends to include these changes and modifications.

Claims

1. A multi-segment guide rail characterized by, The utility model relates to a kind of rail locking device, including: Middle rail (2), it is equipped with second guide groove (20) extending along length direction; Inner rail (3), it can be telescopic in second guide groove (20) to front, it is equipped with third guide groove (30) extending along length direction; Second locking assembly (6), including blocking piece (61) and detent (62), blocking piece (61) is protruding in second guide groove (20) and is close to the front end of middle rail (2);Detent (62) is rotatably arranged in third guide groove (30) and is close to the rear end of inner rail (3), and limit slot (621) is opened opposite blocking piece (61);With the rotation of detent (62), limit slot (621) is engaged or separated from blocking piece (61).

2. The multi-segment rail of claim 1, wherein: Second locking assembly (6) further includes first elastic member (63), one end of first elastic member (63) is connected with detent (62), and the other end is abutted with the inner side of second guide groove (20), to push limit slot (621) to blocking piece (61).

3. The multi-stage guide rail according to claim 1, characterized by: It further includes unlocking assembly (7), unlocking assembly (7) includes handle (71) and connecting piece (73), handle (71) is rotatably arranged in third guide groove (30), and at least a part is stretched out from the outside of the front end of third guide groove (30), connecting piece (73) is arranged in third guide groove (30), one end is connected with handle (71), and the other end is connected with detent (62); When handle (71) rotates, detent (62) can be pulled to rotate by connecting piece (73), so that blocking piece (61) is separated from limit slot (621).

4. The multi-stage guide rail according to claim 1, characterized by: It further includes outer rail (1) and first locking assembly (5), outer rail (1) is equipped with first guide groove (10) extending along length direction, and middle rail (2) can be telescopic in first guide groove (10) to front. First locking assembly (5) includes lug (51) and swing piece (53), lug (51) is protruding in first guide groove (10);Swing piece (53) is rotatably arranged in second guide groove (20);With the rotation of swing piece (53), lug can be abutted with swing piece (53) or pass through swing piece (53).

5. The multi-stage guide rail according to claim 4, characterized by: Swing piece (53) includes shaft center end (531) and swing end (532) respectively located at both ends in length direction, shaft center end (531) is connected with second guide groove (20), and second sliding slot (5322) is opened in the side of swing end (532) towards first guide groove (10);Second guide groove (20) is opened with through groove (27), and at least a part of swing piece (53) can pass through through groove (27) and be connected with lug (51).

6. The multi-stage guide rail according to claim 5, characterized by: The guiding bevels (5312) are respectively connected between the two outer sides of the shaft center end (531) and the swing end (532), and the distance between the two guiding bevels (5312) gradually increases in the direction from the shaft center end (531) to the swing end (532); When the inner rail (3) is retracted into the second guide groove (20), the inner side wall of the third guide groove (30) is in contact with the guiding bevels (5312), which pushes the swing member (53) to rotate and enter the third guide groove (30).

7. The multi-stage guide rail according to claim 4, characterized by: The sliding assembly (4) is further included, which comprises a bead strip (41) and a ball (42), the bead strip (41) is laid between the inner side wall of the first guide groove (10) and the outer side wall of the second guide groove (20) and / or between the inner side wall of the second guide groove (20) and the outer side wall of the third guide groove (30) in the length direction; the ball (42) is embedded on the bead strip (41) and rolls in the length direction.

8. The multi-stage guide rail according to claim 7, characterized by: The first guide groove (10) is provided with a first blocking part (14) protruding into the first guide groove (10); the second guide groove (20) is provided with a third blocking part (25) protruding outward from the rear end of the second guide groove (20); The sliding assembly (4) between the outer rail (1) and the middle rail (2) can abut against the first blocking part (14) at one end in the length direction and abut against the third blocking part (25) at the other end.

9. The multi-stage guide rail of claim 7, wherein: The second guide groove (20) is provided with a second blocking part (24) protruding into the second guide groove (20); the third guide groove (30) is provided with a fourth blocking part (35) protruding outward from the third guide groove (30); The sliding assembly (4) between the middle rail (2) and the inner rail (3) can abut against the second blocking part (24) at one end in the length direction and abut against the fourth blocking part (35) at the other end.

10. The multi-stage guide rail of claim 4, wherein: The plate surface of the outer rail (1) is further provided with a plurality of mounting holes (15), and the mounting holes (15) penetrate the outer rail (1).

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