Self-locking guide rail

Abstract

The utility model relates to a self-locking guide rail which comprises an outer rail provided with a first guide groove extending in the length direction, and a positioning groove is further formed in the front end of the outer rail in the length direction. The middle rail is arranged in the first guide groove in a sliding mode, and a second guide groove extending in the length direction is formed in the middle rail; the inner rail is arranged in the second guide groove in a sliding mode, and a third guide groove extending in the length direction is formed in the inner rail; the unlocking assembly is rotationally arranged in the third guide groove and comprises a handle, and the handle is provided with a positioning part extending towards the direction of the outer rail in a protruding mode; and when the self-locking guide rail retracts to the shortest length, the positioning part can enter the positioning groove along with the rotation of the handle to limit the extension of the middle rail and the inner rail. According to the self-locking guide rail disclosed by the utility model, the positioning part enters or is separated from the positioning groove to realize self-locking or unlocking in a contraction state by rotating the handle, and the self-locking guide rail has the advantages of simple structure, easiness in mass production and convenience in unlocking.

Description

TECHNICAL FIELD

[0001] The utility model relates to guide rail technical field, especially a kind of self-locking guide rail. BACKGROUND

[0002] Guide rail is widely used in industry, business and civil drawer, pull basket, tray, showcase etc., and gradually extends to IT, telecommunication, bank and other industries. The existing three-section ball guide rail is mainly composed of outer rail, middle rail and inner rail sliding assembly. The outer rail and the middle rail, and the middle rail and the inner rail are separated by balls and slidingly supported. Under the action of pulling or pushing, they slide with each other and freely expand or contract. This three-section ball guide rail cannot realize self-locking when it is retracted. When the drawer is inclined or subjected to slight pulling force, it is easy to automatically slide out, which brings inconvenience to the user. Especially when the guide rail is applied to the drawer of refrigerator, freezer, disinfection cabinet, cabinet and other household appliances which have certain requirements for sealing, it is more necessary to have self-locking function when the drawer is closed. SUMMARY

[0003] Therefore, the utility model provides a kind of self-locking guide rail.

[0004] A self-locking guide rail comprises an outer rail provided with a first guide groove extending along a length direction, a positioning groove being further formed at a front end in the length direction of the outer rail; a middle rail capable of extending and retracting in the first guide groove and provided with a second guide groove extending along the length direction; an inner rail capable of extending and retracting in the second guide groove and provided with a third guide groove extending along the length direction; and an unlocking assembly comprising a handle, the handle being rotatably arranged at the front end of the third guide groove in the length direction and provided with a positioning portion extending towards the outer rail.

[0005] When the self-locking guide rail is retracted to the shortest length, the positioning portion can enter the positioning groove along with the handle rotating to limit the middle rail and the inner rail from extending out.

[0006] The self-locking guide rail has the advantages of simple structure, easy mass production and convenient unlocking, since the positioning portion enters or leaves the positioning groove to realize self-locking or unlocking in the retracted state by rotating the handle when the guide rail is retracted to the shortest length.

[0007] Further, the positioning groove is provided with an opening communicating with the outside, and a sixth blocking portion is formed at the opening to partially close the opening; the positioning portion can enter the positioning groove from the opening along with the handle rotating and abut against the sixth blocking portion.

[0008] According to the above technical solution, the positioning portion enters the positioning groove from the opening and abuts against the sixth blocking portion to realize self-locking.

[0009] Further, the self-locking guide rail further comprises a second locking assembly, the second locking assembly comprises a clamping piece, the clamping piece is rotationally arranged in the third guide groove and close to the rear end of the inner rail, and a protruding portion is protrudingly arranged on one side of the clamping piece close to the middle rail; the middle rail is provided with a clamping portion at the front end in the length direction;

[0010] With rotation of the clamping piece, the protruding portion abuts against the clamping portion, or the protruding portion is separated from the clamping portion.

[0011] Through the above technical solution, the protruding portion abuts against the clamping portion to lock the inner rail and prevent the inner rail from retreating; when the protruding portion is separated from the clamping portion, the abutment of the inner rail is released, and the inner rail can move freely.

[0012] Further, the second locking assembly further comprises a first elastic piece, one end of the first elastic piece is connected to the clamping piece, and the other end abuts against the inner side wall of the third guide groove.

[0013] Through the above technical solution, when the clamping piece is not restricted by other components, the first elastic piece rotates the clamping piece around the shaft and makes the protruding portion abut against the clamping portion to lock the inner rail.

[0014] Further, the unlocking assembly further comprises a pushing piece and a connecting piece, the other side of the clamping piece away from the protruding portion is provided with an inclined surface; the pushing piece is slidingly arranged in the third guide groove and close to the inclined surface, the pushing piece is provided with an arc-shaped protruding block opposite to the inclined surface; one end of the connecting piece is connected to the handle, and the other end is connected to the pushing piece.

[0015] Rotating the handle, the pushing piece is close to the clamping piece and rotates the clamping piece around the shaft, the protruding portion is separated from the clamping portion; or the pushing piece is away from the clamping piece, the clamping piece rotates around the shaft, and the protruding portion abuts against the clamping portion.

[0016] Through the above technical solution, the user controls the abutment and separation of the protruding portion and the clamping portion through the connection and cooperation of the handle, the connecting piece, the pushing piece and the clamping piece.

[0017] Further, the first locking assembly comprises a protruding block, a rotating shaft and a swinging piece; the protruding block is protrudingly arranged in the first guide groove; the rotating shaft is protrudingly arranged in the second guide groove; the swinging piece is rotationally connected with the rotating shaft, and a second sliding groove is formed in one side of the swinging piece facing the first guide groove; a through groove is formed in the second guide groove, and at least a part of the swinging piece can pass through the through groove and abut against the protruding block.

[0018] With rotation of the swinging piece, the protruding block can pass through the second sliding groove, or the protruding block abuts against the swinging piece.

[0019] Through the technical scheme, the convex block and the swing piece abut to lock the center rail, preventing the center rail from retreating, and when the convex block passes through the second sliding groove, the locking of the center rail is released, and the center rail can freely move in the first guide groove.

[0020] Further, the swing piece includes an axis end and a swing end respectively located at two ends in the length direction, the axis end is sleeved on the rotating shaft, two guide inclined surfaces are respectively connected between the two outer sides of the axis end and the swing end, and the distance between the two guide inclined surfaces gradually increases from the direction of the axis end to the swing end; the swing end is protruded with a fifth blocking part extending to the first guide groove;

[0021] When the inner rail retreats in the second guide groove, the inner side wall of the inner rail abuts against the guide inclined surface, pushing the swing piece to rotate and enter the third guide groove.

[0022] Through the technical scheme, when the inner rail retreats, the swing piece is pushed to rotate and enter the third guide groove, so that the convex block can pass through the second sliding groove, and the locking of the center rail is released.

[0023] Further, the self-locking guide rail further includes a sliding assembly, the sliding assembly includes a bead strip and a rolling ball, the bead strip is laid between the inner side wall of the first guide groove and the outer side wall of the second guide groove and / or between the inner side wall of the second guide groove and the outer side wall of the third guide groove in the length direction; the rolling ball is embedded on the bead strip in the length direction.

[0024] Through the technical scheme, the sliding between the outer rail and the center rail and between the center rail and the inner rail is more flexible, the sound is smaller, and wear is less likely to occur.

[0025] Further, the first guide groove is protruded with a first blocking part at the front end of the first guide groove towards the inner side of the first guide groove; the second guide groove is protruded with a third blocking part at the rear end of the second guide groove towards the outer side of the second guide groove.

[0026] The sliding assembly between the outer rail and the center rail can abut against the first blocking part at one end in the length direction, and can abut against the third blocking part at the other end.

[0027] Through the technical scheme, when the center rail is pulled outwards, the first blocking part and the third blocking part abut against the two ends of the sliding assembly between the outer rail and the center rail respectively, avoiding the center rail from sliding out of the front end of the outer rail.

[0028] Further, the second guide groove is protruded with a second blocking part at the front end of the second guide groove towards the inner side of the second guide groove; the third guide groove is protruded with a fourth blocking part at the rear end of the third guide groove towards the outer side of the third guide groove.

[0029] The sliding assembly (4) between the middle rail (2) and the inner rail (3) can abut against the second blocking part at one end in the length direction and can abut against the fourth blocking part at the other end.

[0030] By the above technical scheme, when the inner rail is pulled outwards, the second blocking part and the fourth blocking part abut against two ends of the sliding assembly between the middle rail and the inner rail respectively, so that the inner rail is prevented from sliding out of the front end of the middle rail BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 A structure schematic view of the self-locking guide rail in a stretched state is provided in the utility model;

[0032] Figure 2 A structure schematic view of the self-locking guide rail in a contracted state is provided in the utility model; Figure 1 A partial sectional view of A-A;

[0033] Figure 3 A structure schematic view of the outer rail is provided in the utility model;

[0034] Figure 4 A structure schematic view of the middle rail is provided in the utility model;

[0035] Figure 5 A structure schematic view of the middle rail when the first locking assembly forms locking is provided in the utility model;

[0036] Figure 6 A structure schematic view of the inner rail is provided in the utility model;

[0037] Figure 7 A structure schematic view of the inner rail when the inner rail is slidably arranged in the middle rail is provided in the utility model;

[0038] Figure 8 A structure schematic view of the self-locking guide rail in a contracted state is provided in the utility model; Figure 5 An enlarged view of A;

[0039] Figure 9 A structure schematic view of the sliding assembly is provided in the utility model;

[0040] Figure 10 A structure schematic view of the self-locking guide rail in a contracted state is provided in the utility model;

[0041] Figure 11 An enlarged view of B; Figure 8 An enlarged view of B;

[0042] Figure 12 A structure schematic view of the self-locking guide rail in a contracted state is provided in the utility model; DETAILED DESCRIPTION

[0043] To address the limitation of existing drawer slides that cannot self-lock when retracted, the inventor provides a simple and easy-to-unlock self-locking drawer slide. This design features a positioning groove on the outer slide and a rotatable unlocking component on the inner slide near the drawer's outer side. The unlocking component has a protruding positioning part that engages with the positioning groove. When the drawer slide is retracted, the positioning part engages within the positioning groove as the handle rotates, thus achieving self-locking. The following is a specific embodiment of the self-locking drawer slide provided by this invention:

[0044] like Figure 1 As shown, the projection is along the direction perpendicular to the surface of the outer rail 1, with... Figure 1 The vertical direction is the length direction, i.e. the opening and closing direction of the drawer, and the horizontal direction is the width direction, i.e. the vertical direction of the drawer. 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.

[0045] Please refer to Figures 1 to 12 , Figure 1 A schematic diagram of the structure of the self-locking 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; Figure 2 for Figure 1 A partial sectional view at point AA in the middle; Figure 3 A schematic diagram of the spatial structure of the outer rail provided by this utility model; Figure 4 A schematic diagram of the spatial structure of the middle track provided by this utility model; 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; Figure 6 A schematic diagram of the spatial structure of the inner rail provided by this utility model; 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; Figure 8 for Figure 5 Enlarged view of point A in the middle; Figure 9 A schematic diagram of the spatial structure of the sliding component provided by this utility model; Figure 10 A schematic diagram of the spatial structure of the self-locking guide rail provided by this utility model when it is in a retracted state; Figure 11 for Figure 8 Enlarged view of point B in the middle; Figure 12 A schematic diagram of the spatial structure of the swing component provided by this utility model.

[0046] This utility model provides a self-locking guide rail, including an outer rail 1, a middle rail 2, an inner rail 3, a sliding component 4, a first locking component 5, a second locking component 6, and an unlocking component 7. The outer rail 1, the middle rail 2, and the inner rail 3 are typically formed by rolling alloy material and sequentially nested together. The sliding component 4 is respectively disposed between the outer rail 1 and the middle rail 2, and between the middle rail 2 and the inner rail 3. When the middle rail 2 is pulled out from the outer rail 1 to its limit position, the first locking component 5 locks the middle rail 2, preventing it from retracting; when the inner rail 3 is pulled out from the middle rail 2 to its limit position, the second locking component 6 locks the inner rail 3, preventing it from retracting. The unlocking component 7 is mechanically connected to the second locking component 6, controlling the second locking component 6 to release the lock. Furthermore, the unlocking component 7 can also lock the outer rail 1 and the inner rail 3 together when the self-locking guide rail retracts to its shortest length; and unlock the first locking component 5 when the inner rail 3 retracts.

[0047] Please refer to the reference. Figure 1 and Figure 3 The outer rail 1 includes a first guide groove 10, an outer rail body 11, a first side extension 12, a first stop 13, a first blocking part 14, and a mounting groove 15. Specifically, the outer rail body 11 is a long strip-shaped plate extending along the length direction, with its inner plate surface near the middle rail 2 and its outer plate surface away from the middle rail 2. The upper and lower sides of the outer rail body 11 in the width direction are provided with first side extensions 12 by a flanged process. The first side extensions 12 protrude from the inner plate surface of the outer rail 1 in a direction perpendicular to the inner plate surface. The two first side extensions 12 enclose each other to form the first guide groove 10. The first stop 13 protrudes from the rear end of the first guide groove 10 and protrudes from the inner plate surface of the outer rail 1 in a direction perpendicular to the inner plate surface. When the middle rail 2 retracts to its rearmost position to the right, the first stop 13 abuts against the rear end of the middle rail 2 to limit its movement and prevent the middle rail 2 from dislodging from the rear end of the outer rail 1. The first blocking part 14 is provided on the upper and lower sides of the front end of the outer rail 1, and is formed by bending a portion of the first side extension 12 inward toward the first guide groove 10. In the width direction, the distance between the two first blocking parts 14 is less than the distance between the two sliding components 4 located between the outer rail 1 and the middle rail 2. When the middle rail 2 is pulled out to the left from the outer rail 1 to its frontmost position, the first blocking part 14 abuts against the sliding component 4 to limit its movement and prevent the sliding component 4 from dislodging from the front end of the outer rail 1. The mounting hole 15 penetrates the outer rail body 11, and the self-locking guide rail can be fixed to the drawer wall or wall (not shown in the figure) by screws engaging with the mounting hole 15.

[0048] Please refer to the reference.Figure 1 and Figure 4 The middle rail 2 is slidably disposed within the first guide groove 10, and includes a second guide groove 20, a middle rail body 21, a second side extension 22, a second stop 23, a second blocking part 24, a third blocking part 25, and a first sliding groove 26. Specifically, the middle rail body 21 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 inner rail 3 being the inner plate surface and the side closer to the outer rail body 11 being the outer plate surface. The upper and lower sides of the middle rail body 21 in the width direction are provided with second side extensions 22 by a flanged process, and the second side extensions 22 protrude from the inner plate surface of the middle rail 2 in a direction perpendicular to the inner plate surface of the middle rail 2. The two second side extensions 22 enclose each other to form the second guide groove 20. The second stop 23 protrudes from the inner plate surface of the middle rail body 21 and is located at the rear end of the second guide groove 20. When the inner rail 3 retracts to the right to its rear limit position, the second stop 23 abuts against the rear end of the inner rail 3 to limit it and prevent the inner rail 3 from coming off the rear end of the middle rail 2. The second blocking part 24 is provided on the upper and lower sides of the front end of the middle rail 2 and is formed by bending a portion of the second side extension 22 towards the inner side of the second guide groove 20. In the width direction, the distance between the two second blocking parts 24 is less 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 its front limit position, the second blocking part 24 abuts against the sliding component 4 to limit it and prevent the sliding component 4 from coming off the front end of the middle rail 2. The third blocking part 25 is provided on the upper and lower sides of the rear end of the middle rail 2 and is formed by bending a portion of the second side extension 22 towards the outer side of the second guide groove 20. In the width direction, the distance between the two third blocking parts 25 is greater than the distance between the two sliding components 4 located between the outer rail 1 and the middle rail 2. When the middle rail 2 is pulled out to the left from the outer rail 1 to its front limit position, the third blocking part 25 abuts against the sliding component 4 to limit its movement. Through the limiting cooperation of the first blocking part 14, the third blocking part 25, and the sliding component 4 located between the outer rail 1 and the middle rail 2, the middle rail 2 is prevented from detaching from the front end of the outer rail 1. The first sliding groove 26 is recessed 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 groove 10 of the outer rail 1, the first side extension 12 and the second side extension 22 on the upper and lower sides are respectively arranged opposite to each other, and a gap is left between them for placing the sliding component 4.

[0049] Please refer to the reference. 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.

[0050] Please refer to the reference. Figure 1 and Figure 9The sliding component 4 includes a beaded strip 41 and ball bearings 42 as in the prior art. The beaded strip 41 is laid along the length direction 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. A plurality of bead holes (not shown) arranged along the length direction are formed between the beaded strips 41. The ball bearings 42 are rotatably embedded in the bead holes. The diameter of the ball bearings 42 is slightly larger than the outer diameter of the beaded strips 41, and they are respectively 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. When the drawer is opened, under the action of friction, the sliding component 4 moves along the length direction with the middle rail 2 or the inner rail 3 until one end abuts against the first blocking part 14 or the second blocking part 24. Simultaneously, it continues to move along the length direction with the middle rail 2 or the inner rail 3, and the third blocking part 25 or the fourth blocking part 35 abuts against the other end of the sliding component 4. At this point, the middle rail 2 or the inner rail 3 is pulled out to its front limit position. Furthermore, the ball bearing 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 quieter during movement. Replacing the original sliding friction with the rolling friction of the ball bearing 42 reduces the frictional force during movement, making the first side extension 11, the second side extension 21, and the third side extension 32 less prone to wear, thereby increasing the service life of the self-locking guide rail.

[0051] Please refer to the reference. Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 12The first locking assembly 5 includes a protrusion 51, a rotating shaft 52, and a swing member 53. The protrusion 51 is disposed within the first guide groove 10, protruding from the inner plate surface of the outer rail body 11 and located within the first sliding groove 26, projecting perpendicular to the inner plate surface of the outer rail 1. The upper and lower sides of the protrusion 51 in the width direction are parallel to the length direction. When the middle rail 2 moves freely within the first guide groove 10, the protrusion 51 can move freely relative to the first sliding groove 26. The rotating shaft 52 protrudes within the second guide groove 20 and extends in a direction 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 a central end 531 and a swing end 532 located at both ends, with the swing end 532 near the rear end of the second guide groove 20. The shaft end 531 has a first shaft hole 5311, into which the rotating shaft 52 is inserted. The shaft end 531 also has guide ramps 5312 on its upper and lower sides in the width direction. The distance between the two guide ramps 5312 gradually increases from the shaft end 531 towards the swing end 532. The swing end 532 has fifth blocking portions 5321 on its upper and lower sides in the width direction. These fifth blocking portions 5321 extend into the inner surface of the middle rail body 21, and the two fifth blocking portions 5321 enclose each other to form a second sliding groove 5322 that cooperates with the protrusion 51. The middle rail 2 has a through groove 27, into which at least a portion of the third blocking portion 5321 is inserted and can swing within the through groove 27, causing the fifth blocking portion 5321 to be inclined relative to the second side extension 22. The fifth blocking part 5321 passes through the through groove 27 and enters the first sliding groove 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 approximately equal to the width of the inner side of the third guide groove 30. When the inner rail 3 retracts to the right to its limit position, that is, when the rear end of the inner rail 3 approaches the second stop 22, the third side extension 32 abuts against the end of the guide slope 5312 and pushes the swing member 53 to rotate around the rotation axis 52, so that it enters the third guide groove 30. The upper and lower sides of the swing end 532 in the width direction abut against the inner surfaces of the two third side 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 move freely in the first sliding groove 26. At this time, the middle rail 2 can move freely relative to the outer rail 1. When the middle rail 2 is pulled out to the left from the outer rail 1 to its limit position, the protrusion 51 passes through the second sliding groove 5322 and is located in the retraction path of the middle rail 2. Then, the inner rail 3 is pulled out to the left from the middle rail 2, and the swing member 53 disengages from the third guide groove 30. Under the action of gravity, it rotates around the rotating axis 52, 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 blocking part 5321 to limit the movement, thus locking the middle rail 2 and preventing it from retracting to the right. When it is necessary to retract the middle rail 2 to the right, the inner rail 3 is pulled out to the left. Retracting to the right, the third side extension 32 abuts against the end of the guide slope 5312, and pushes the swing member 53 to rotate around the rotation axis 52, so that it enters the third guide groove 30. The fifth blocking part 5321 disengages from the abutment state of the protrusion 51, so that the second sliding groove 5322 is parallel to the upper and lower sides of the protrusion 51, and the protrusion 51 can pass through the second sliding groove 5322, so that the middle rail 2 can be released from the locked state and retract to the right.

[0052] Preferably, the right side of the protrusion 51 in the length direction is provided with an arc-shaped surface 511. When the protrusion 51 is located in front of the swing member 53 and the middle rail 2 is pulled out, the third blocking part 53 abuts against the arc-shaped surface 511. The swing member 53 rotates around the rotating axis 52 under the guidance of the arc-shaped 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 when the swing member 53 rotates under the action of gravity, the protrusion 51 blocks the middle rail 2 from being pulled out.

[0053] Please refer to the reference. Figure 6 , Figure 7 and Figure 8The second locking component 6 is disposed on the third guide groove 30 and includes a locking member 61 and a first elastic member 62 and a pushing member 70. The locking member 61 is sleeved on the first connecting shaft 33 and can rotate around the first connecting shaft 33. The locking member 61 has a protrusion 611 at one end near the first sliding groove 26, and the protrusion 611 extends away from the inner plate surface of the inner rail body 31. The locking member 61 also has an inclined surface 612 at the other end away from the first sliding groove 26. In the width direction, the protrusion 611 and the inclined surface 612 are respectively located on opposite sides of the locking member 61. The first sliding groove 26 has a locking part 261 on one side near the front end of the middle rail 2 that abuts against the protrusion 611. The first elastic member 62 is a torsion spring, and its winding is sleeved on the first connecting shaft 33. One end is connected to the locking member 61, and the other end is connected to the third side extension 32. When the locking member 61 is not subject to other restrictions, under the torque of the first elastic member 62, the locking member 61 rotates around the first connecting shaft 33, so that the protrusion 611 abuts against the locking part 261, thereby locking the inner rail 3 and preventing the inner rail 3 from retracting.

[0054] Please refer to Figure 6 and Figure 7The unlocking component 7 is disposed within the third guide groove 30 and near its front end in the length direction. It drives the pusher 70 to reciprocate linearly within the third guide groove 30 and locks the outer rail 1 and inner rail 3 together to complete self-locking when the self-locking guide rail retracts to its shortest length. The unlocking component 7 includes a pusher 70, a handle 71, a second elastic member 72, and a connector 73. The pusher 70 is installed within the third guide groove 30 and located on the side of the locking member 61 away from the first sliding groove 26. The pusher 70 is a long plate, and its upper and lower sides abut against the inner surfaces of the third side extensions 32 on the upper and lower sides of the inner rail 3, respectively, enabling it to reciprocate linearly along the length direction within the third guide groove 30. The pusher 70 has an arc-shaped protrusion 701 at one end near the locking member 61. The arc-shaped protrusion 701 is close to one of the third side extensions 32 and located above the inclined surface 612, abutting against the inclined surface 612. In the direction away from the arc-shaped protrusion 701, the distance from the arc-shaped protrusion 701 to one of the third side extensions 32 gradually decreases. When the pushing member 70 moves toward the locking member 61, under the action of the arc-shaped protrusion 701 and the inclined surface 612, the locking member 61 rotates around the first connecting shaft 33, causing the protrusion 611 to disengage from the locking part 261. At this time, the inner rail 3 is unlocked and can move freely along the second guide groove 20. When the pushing member 70 moves away from the locking member 61, the locking member 61 is subjected to the torque of the first elastic member 62 and rotates around the first connecting shaft 33, causing the protrusion 611 to abut against the locking part 261 and lock the inner rail 3. The handle 71 includes 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, allowing the user to rotate the handle 71. The second elastic element 72 is a torsion spring, its winding is sleeved on the second connecting shaft 34, one end is connected to the handle 71, and the other end is connected to the third side extension 32. Initially, under the torsion of the second elastic element 72, the upper side of the rotating end 711 abuts against the inner surface of the third side extension 32 on the upper side of the inner rail 3. The connecting element 73 is a rigid element such as a connecting rod or steel wire extending along the length direction, one end of which is connected to the pushing element 70, and the other end is connected to the rotating end 711. In this embodiment, the pushing element 70 and the rotating end 711 are respectively provided with a first connecting hole (not shown in the figure) and a second connecting hole (not shown in the figure). One end of the connecting element 73 is hooked into the first connecting hole, and the other end is hooked into the second connecting hole.When the user rotates the handle 71, the rotating end 711 rotates around the second connecting shaft 34 and moves towards the pusher 70. The connecting member 73 pushes the pusher 70 towards the locking member 61, causing the protrusion 611 to disengage from the locking part 261 and releasing the lock on the inner rail 3. When the user releases the handle 71, under the torque of the second elastic member 72, the rotating end 711 rotates in the opposite direction around the second connecting shaft 34 and moves away from the pusher 70, causing the handle 71 to return to the state where the upper side of the rotating end 711 abuts against the inner surface of the side extension 31 on the upper side of the inner rail 3. At this time, the pusher 70 moves away from the locking member 61, causing the protrusion 611 to abut against the locking part 261 and lock the inner rail 3.

[0055] Please refer to the reference. Figure 10 and Figure 11 Preferably, the outer rail body 11 has a positioning groove 16 at its front end, the positioning groove 16 has an opening 161 communicating with the outer side of the outer rail 1, and a sixth blocking part 17 is formed at the opening 161, so that the opening 161 is partially closed. The middle rail body 21 has a clearance groove (not shown in the figure) at its front end, the clearance groove communicating with the outer plate surface and the inner plate surface of the middle rail body 21. The rotating end 711 has a positioning part 713 protruding and extending towards the outer rail body 11, the positioning part 713 rotating with the rotating end 711 around the second connecting shaft 34. When the self-locking guide rail is in the retracted state, that is, when the middle rail 2 and the inner rail 3 retract to their shortest length, the positioning part 713 passes through the clearance groove and approaches the positioning groove 16. When the user rotates the handle 71, the positioning part 713 rotates and enters the positioning groove 16 from the opening 161, and abuts against the sixth blocking part 17 to achieve self-locking of the self-locking guide rail in the retracted state, preventing the middle rail 2 and the inner rail 3 from automatically sliding out. When the handle 71 is rotated, the positioning part 713 separates from the sixth blocking part 17 and can leave the positioning groove 16 from the opening 161, thereby releasing the self-locking of the self-locking guide rail in the retracted state.

[0056] The working principle of the self-locking guide rail provided by this utility model is as follows: When the self-locking guide rail is in the retracted state, rotating the handle 71 releases the contact between the positioning part 713 and the sixth blocking part 17 and disengages from the positioning groove 16 through the opening 161, thus releasing the self-locking. At this time, the middle rail 2 and the inner rail 3 can be pulled outward. When the middle rail 2 and the inner rail 3 are pulled out to their maximum length, that is, when the first blocking part 14 and the third blocking part 25 respectively abut against the two ends of the sliding component 4 located between the outer rail 1 and the middle rail 2 in the length direction, and the second blocking part 24 and the fourth blocking part 35 respectively abut against the two ends of the sliding component 4 located between the middle rail 2 and the inner rail 3 in the length direction, the protrusion 51 is located on the retraction path of the middle rail 2 and abuts against the fifth blocking part 5321 to prevent the middle rail 2 from retracting, and the protrusion 611 abuts against the locking part 261 to prevent the inner rail 3 from retracting. When it is necessary to retract the middle rail 2 and the inner rail 3, rotate the handle 71, and push the pusher 70 towards the locking member 61 through the connector 73. The pusher 70 pushes the locking member 61 to rotate around the first connecting shaft 33, so that the protrusion 611 disengages from the locking part 261, releasing the lock on the inner rail 3. At the same time, during the retraction process of the inner rail 3, the third side extension 32 abuts against the end of the guide slope 5312, and pushes the swing member 53 to rotate into the third guide groove 30, so that the fifth blocking part 5321 disengages from the protrusion 51. The protrusion 51 passes through the second sliding groove 5322, releasing the lock on the middle rail 2 and retracting to the right. When the middle rail 2 and the inner rail 3 retract to their shortest length, i.e., when the first blocking block 13 abuts against the rear end of the middle rail 2 and the second blocking block 23 abuts against the rear end of the inner rail 3, the handle 71 is rotated so that the positioning part 713 enters the positioning groove 16 from the opening 161 on the right side of the positioning groove 16 and abuts against the sixth blocking part 17 to achieve self-locking.

[0057] Compared with existing technologies, the self-locking guide rail provided by this utility model has the following advantages:

[0058] (1) When the self-locking guide rail is in the extended state, the first locking component 5 and the second locking component 6 lock the middle rail 2 and the inner rail 3 respectively, so as to prevent the middle rail 2 and the inner rail 3 from retracting when they are extended and working, thus maintaining a stable working state.

[0059] (2) When the self-locking guide rail is in the retracted state, the positioning part 713 cooperates with the positioning groove 15 to achieve self-locking, so as to prevent the middle rail 2 and the inner rail 3 from sliding out automatically.

[0060] (3) Users only need to turn the handle 71 to disengage the positioning part 713 from the positioning groove 15 to release the self-locking and pull the middle rail 2 out of the outer rail 1, which is convenient and quick to unlock.

[0061] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and this utility model also intends to include these modifications and variations.

Claims

1. A self-locking guide rail, characterized in that, include: The outer rail (1) is provided with a first guide groove (10) extending along the length direction, and a positioning groove (16) is also provided at its front end along the length direction. The middle rail (2) is capable of extending and retracting inside and outside the first guide groove (10), and is provided with a second guide groove (20) extending along the length direction; The inner rail (3) is capable of extending and retracting inside and outside the second guide groove (20), and is provided with a third guide groove (30) extending along the length direction; The unlocking component (7) includes a handle (71), which is rotatably disposed at the front end of the third guide groove (30) in the length direction and has a positioning part (713) protruding and extending toward the outer rail (1). When the self-locking guide rail retracts to its shortest length, the positioning part (713) can rotate with the handle (71) and enter the positioning groove (16), restricting the middle rail (2) and the inner rail (3) from extending.

2. The self-locking guide rail according to claim 1, characterized in that: The positioning groove (16) is provided with an opening (161) communicating with the outside, and a sixth blocking part (17) is formed at the opening (161) so that the opening (161) is partially closed; the positioning part (713) can rotate with the handle (71) and enter the positioning groove (16) from the opening (161) and abut against the sixth blocking part (17).

3. The self-locking guide rail according to claim 1, characterized in that: It also includes a second locking assembly (6), which includes a locking member (61) that is rotatably disposed in the third guide groove (30) and close to the rear end of the inner rail (3). The locking member (61) has a protrusion (611) on the side close to the middle rail (2). The middle rail (2) has a locking part (261) at the front end in the length direction. As the locking member (61) rotates, the protrusion (611) abuts against the locking part (261), or the protrusion (611) separates from the locking part (261).

4. The self-locking guide rail according to claim 3, characterized in that: The second locking component (6) further includes a first elastic element (62), one end of which is connected to the locking element (61), and the other end abuts against the inner wall of the third guide groove (30).

5. The self-locking guide rail according to claim 3, characterized in that: The unlocking component (7) further includes a pusher (70) and a connector (73). The locking component (61) has an inclined surface (612) on the side away from the protrusion (611). The pusher (70) is slidably disposed in the third guide groove (30) and close to the inclined surface (612). The pusher (70) has an arc-shaped protrusion (701) opposite to the inclined surface (612). One end of the connector (73) is connected to the handle (71), and the other end is connected to the pusher (70). When the handle (71) is rotated, the pusher (70) moves closer to the locking member (61) and pushes the locking member (61) to rotate around the axis, and the protrusion (611) separates from the locking member (261); or the pusher (70) moves away from the locking member (61), and the locking member (61) rotates around the axis, and the protrusion (611) abuts against the locking member (261).

6. The self-locking guide rail according to claim 1, characterized in that: It also includes a first locking assembly (5), which includes a protrusion (51), a rotating shaft (52), and a swing member (53); the protrusion (51) protrudes into the first guide groove (10); the rotating shaft (52) protrudes into the second guide groove (20); the swing member (53) is rotatably connected to the rotating shaft (52), and the swing member (53) has a second sliding groove (5322) on the side facing the first guide groove (10); the second guide groove (20) has a through groove (27), and at least a portion of the swing member (53) can pass through the through groove (27) and connect with the protrusion (51); As the swing member (53) rotates, the protrusion (51) can pass through the second sliding groove (5322) or the protrusion (51) abuts against the swing member (53).

7. The self-locking guide rail according to claim 6, characterized in that: The swing member (53) includes a central end (531) and a swing end (532) located at both ends in the length direction. The central end (531) is sleeved on the rotating shaft (52). Guide slopes (5312) are connected between the two outer sides of the central end (531) and the swing end (532). The distance between the two guide slopes (5312) gradually increases in the direction from the central end (531) to the swing end (532). A fifth blocking part (5321) protruding from the swing end (532) and extending into the first guide groove (10) is provided. When the inner rail (3) retracts into the second guide groove (20), the inner sidewall of the inner rail (3) connects with the guide ramp (5312), pushing the swing member (53) to rotate and enter the third guide groove (30).

8. The self-locking guide rail according to claim 1, characterized in that: It also includes a sliding component (4), which includes a bead strip (41) and a ball (42). The bead strip (41) is laid along the length direction between the inner wall of the first guide groove (10) and the outer wall of the second guide groove (20) and / or between the inner wall of the second guide groove (20) and the outer wall of the third guide groove (30). The ball (42) is rolled and embedded in the bead strip (41) along the length direction.

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

10. The self-locking guide rail according to claim 8, characterized in that: The front end of the second guide groove (20) protrudes into the inner side of the second guide groove (20); the rear end of the third guide groove (30) protrudes outward into the outer side of 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 against the fourth blocking part (35) at the other end.

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