Friction type sliding rail

Abstract

The utility model discloses a friction type sliding rail which comprises a first rail body, and the first rail body comprises a first web plate and first enveloping parts which extend in the thickness direction on the two sides of the width direction. The second rail is slidably mounted in the first rail and comprises a second web and second enveloping parts, the second enveloping parts are arranged on the two sides of the width direction and bent oppositely, the second enveloping parts form guide cavities, and only the second enveloping parts of the second rail make contact with the first rail. The third rail is slidably mounted in the second rail and comprises a third web and a sliding part sliding in the guide cavity along the two sides of the width direction, the thickness of the sliding part is larger than that of the third web, and the third web is not in contact with the second rail. The strength of the friction type sliding rail is improved on the basis of not occupying extra space.

Description

TECHNICAL FIELD

[0001] The utility model relates to slide rail technical field especially relates to a friction type slide rail. BACKGROUND

[0002] The slide rail is widely used in the device that can bear the article, is used for making two objects relative sliding, is initially used in furniture such as drawer, computer keyboard tray etc., is later used in electronic device such as server etc. The existing slide rail is divided into friction type slide rail and ball bearing type slide rail, and the ball bearing type slide rail is smooth and happy, but the precision requirement is very high, so its design and manufacturing cost are also higher. The friction type slide rail does not have any ball bearing support, and the structure is simple, and the cost is low, so it is widely used. But the existing friction type slide rail can achieve three-stage sliding, but since the server cabinet for bearing the server of the slide rail also tends to be large, on the one hand, the slide rail develops to thin and small to make more space for bearing the server, and on the other hand, the bearing capacity for the slide rail is continuously improved to be able to bear larger server. Therefore, the slide rail needs to be improved to increase the strength of the slide rail without occupying additional space. SUMMARY

[0003] In order to overcome the above-mentioned shortcomings, the utility model discloses a friction type slide rail, which increases the strength without occupying additional space.

[0004] In order to achieve the above purpose, the utility model adopts the technical scheme of a friction type slide rail, which comprises:

[0005] The first track comprises a web plate one and an envelope part one extending in the thickness direction on both sides of the width direction.

[0006] The second track is slidably installed in the first track, and the second track comprises a web plate two and an envelope part two respectively bent towards each other on both sides of the width direction, the envelope part two forms a guide cavity, and the second track only contacts the envelope part two and the first track.

[0007] The third track is slidably installed in the second track, and the third track comprises a web plate three and a sliding part sliding in the guide cavity on both sides of the width direction, the thickness of the sliding part is greater than the thickness of the web plate three, and the web plate three does not contact the second track.

[0008] The utility model has the advantages of:

[0009] The web plate two and the adjacent web plate one and web plate three are not in contact, and a gap is left between the web plate two and the web plate one and between the web plate two and the web plate three in the thickness direction. On the one hand, the gap provides space for the installation of other locking components, and on the other hand, it reduces the contact area of the second rail and the first rail and the third rail, that is, it reduces the friction force of the friction slide rail in the extension and contraction process, facilitating the sliding of the slide rail.

[0010] The thickness of the sliding part of the third rail is greater than the thickness of the web plate three. When the sliding part slides in the guide cavity formed by the envelope part two, the stability of the third rail is stronger. Even if the third rail has a slight swing in the thickness direction, it can still slide in the sliding cavity due to the thicker sliding part.

[0011] Further, the envelope part two includes a side plate one extending in the thickness direction, the side plate one includes a side surface one facing the envelope part one and a side surface two opposite to the side surface one, the side surface one and the side surface two are both circular arc structures, the envelope part one includes a side surface three abutting against the side surface one and having the same curvature, and the sliding part includes a side surface four abutting against the side surface two and having the same curvature.

[0012] The side surface one and the side surface three form a surface contact, the contact area is large, and the stability of the second rail sliding along the first rail is improved; the side surface two and the side surface four form a surface contact, the contact area is increased, and the stability of the third rail sliding along the second rail is improved.

[0013] Further, the thickness of the sliding part is 1.5-2.5 times the thickness of the web plate three. This range does not increase the overall thickness of the slide rail, but increases the strength.

[0014] Further, the friction slide rail further includes a first locking component, the first locking component is arranged on the web plate two, the first locking component can slide synchronously with the second rail, and the first locking component can be connected or separated with the first rail and the third rail to enable the first rail and the third rail to be locked or unlocked with the second rail.

[0015] Further, the first locking component includes a first elastic member and a clamping block capable of reciprocating in the width direction, both ends of the clamping block in the thickness direction extend out of the web plate two, a first insertion block fixed with the web plate one is arranged between the web plate one and the web plate two, a second insertion block fixed with the web plate three is arranged between the web plate two and the web plate three, the first insertion block and the second insertion block are respectively provided with a first clamping groove and a second clamping groove for inserting the clamping block, and the first elastic member has a pre-tightening force for pushing the clamping block to move towards the first clamping groove or the second clamping groove.

[0016] The first locking assembly uses the cooperation of the clamping piece and the clamping groove to achieve the locking of the second rail with the first rail and the third rail respectively.

[0017] Further, the bottom surface of the clamping block away from the first elastic member comprises a first inclined portion and a second inclined portion, the first inclined portion is located in front of the second inclined portion when the friction slide rail is stretched and slides, and the first inclined portion and the second inclined portion are opposite in inclination direction, the first inclined portion is inclined from the side close to the first elastic member to the side away from the first elastic member towards the rear of the stretching and sliding;

[0018] The first clamping groove and the second clamping groove each comprise a side wall one and a side wall two arranged in sequence along the stretching and sliding direction, the length of the side wall one in the width direction is greater than that of the side wall two, the first insertion block and the second insertion block each comprise an inclined surface connected with the side wall two, the inclined surface matches and can abut against the first inclined portion, and the junction of the inclined surface and the side wall two forms a corner which can abut against the second inclined portion.

[0019] The clamping block uses the inclined surface to convert the force applied in the length direction of the rail into the force in the width direction when the slide rail is stretched and contracted, so that the clamping block overcomes the elastic force of the first elastic member to separate from the first clamping groove or the second clamping groove.

[0020] Further, the web two is provided with a guide hole penetrating through the thickness direction thereof, the clamping block slides in the guide hole, the clamping block is provided with a guide groove on the two sides in the length direction, and part of the web two at the guide hole is embedded in the guide groove. The guide hole guides the movement of the clamping block.

[0021] Further, the friction slide rail further comprises a second locking assembly, the second locking assembly is located between the web two and the web three and can slide synchronously with the third rail, and the second locking assembly can be connected with the second rail to limit the stretching distance of the third rail relative to the second rail.

[0022] Further, the second locking assembly comprises a second elastic member and a swing plate hinged with the web three, the swing plate is provided with a cutout, a protrusion fixed with the web two is arranged between the web two and the web three, and the second elastic member applies a force to the swing plate to make the swing plate swing towards the protrusion until the protrusion is clamped into the cutout.

[0023] Further, the friction slide rail comprises a fixing assembly, the fixing assembly comprises a first support and a second support slidingly installed in the first support, and the second support is fixedly connected with the first rail. The first support and the second support cooperate to increase a level of sliding and realize four levels of sliding. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a three-dimensional structure schematic view of the utility model embodiment;

[0025] Figure 2 It is a section view along the width direction of the utility model embodiment;

[0026] Figure 3 It is Figure 2 The enlarged view of A in the middle;

[0027] Figure 4 It is a burst shot of the utility model embodiment;

[0028] Figure 5 It is a structure schematic view of the first locking assembly in the utility model embodiment;

[0029] Figure 6 It is the butt joint schematic view of the clamping block and the first clamping groove in the utility model embodiment;

[0030] Figure 7 It is a three-dimensional structure schematic view of the clamping block in the utility model embodiment;

[0031] Figure 8 It is a structure schematic view of the second locking assembly in the utility model embodiment.

[0032] In the figure:

[0033] 1, first track; 11, web one; 12, envelope one; 121, side three; 13, first plug; 131, first clamping groove; 1311, side wall one; 1312, side wall two; 1313, inclined section; 132, inclined surface;

[0034] 2, second track; 21, web two; 211, guide hole; 22, envelope two; 22a, guide cavity; 221, side plate one; 2211, side one; 2212, side two; 222, upper horizontal plate; 223, lower horizontal plate; 23, protrusion;

[0035] 3, third track; 31, web three; 32, sliding part; 321, side four; 33, second plug;

[0036] 4, first locking assembly; 41, first elastic member; 42, clamping block; 421, first inclined part; 422, second inclined part; 423, guide groove;

[0037] 5, second locking assembly; 51, second elastic member; 52, swing plate; 521, cutout; 522, bevel; 523, limit waist hole;

[0038] 6, fixing assembly; 61, first support; 62, second support. DETAILED DESCRIPTION

[0039] The advantages and features of the present application will be more apparent from the following detailed description of preferred embodiments of the present application, taken in conjunction with the accompanying drawings, in which:

[0040] The present application is a friction type slide rail, referring to the drawings, Figure 1 The first rail 1, the second rail 2 and the third rail 3 are all sliding along the length direction to realize the extension and contraction of the slide rail.

[0041] Referring to the drawings, Figure 2 The first rail 1 includes the web plate one 11 and the envelope part one 12 extending along the thickness direction on both sides of the width direction, and the cross section of the first rail 1 along the width direction is U-shaped structure.

[0042] The second rail 2 is slidingly installed in the first rail 1, and the cross section of the second rail 2 along the width direction is also U-shaped structure and the opening direction of the cross section is consistent with the first rail 1. The second rail 2 includes the web plate two 21 and the envelope part two 22 respectively bending towards each other on both sides of the width direction, and the envelope part two 22 forms the guide cavity 22a. The second rail 2 only has the envelope part two 22 in contact with the first rail 1, that is, the web plate two 21 is not in contact with the first rail 1, and there is a gap between the web plate two 21 and the web plate one 11.

[0043] The third rail 3 is slidingly installed in the second rail 2, and the cross section of the third rail 3 along the width direction is also U-shaped structure but the opening direction of the cross section is opposite to the first rail 1. The third rail 3 includes the web plate three 31 and the sliding part 32 sliding in the guide cavity 22a on both sides of the width direction, and the thickness of the sliding part 32 is greater than the thickness of the web plate three 31 and the web plate three 31 is not in contact with the second rail 2, that is, only the sliding part 32 is in contact with the second rail 2.

[0044] In the present embodiment, the web plate two 21 is not in contact with the adjacent web plate one 11 and web plate three 31, and there is a gap in the thickness direction between the web plate two 21 and the web plate one 11 and between the web plate two 21 and the web plate three 31. On the one hand, this gap provides space for the installation of the first locking assembly 4 and the second locking assembly 5, and on the other hand, it reduces the contact area between the second rail 2 and the first rail 1 and the third rail 3, that is, it reduces the friction force of the friction type slide rail in the process of extension and contraction, facilitating the sliding of the slide rail.

[0045] In this embodiment, because the thickness of the sliding part 32 of the third track 3 is greater than that of the web 31, the stability of the third track 3 is stronger when the sliding part 32 slides in the guide cavity 22a formed by the envelope part 22. Even if the third track 3 swings slightly in the thickness direction, it can slide in the sliding cavity because of the thicker sliding part 32.

[0046] In one embodiment, the thickness of the sliding part 32 is 1.5-2.5 times the thickness of the web 31. If the thickness of the sliding part 32 is too small, it will not play a reinforcing role, but if the thickness of the sliding part 32 is too large, it will cause the thickness of the entire slide rail to increase.

[0047] See appendix Figure 3 As shown, the second envelope portion 22 has a U-shaped cross-section and includes a side plate 221, an upper horizontal plate 222, and a lower horizontal plate 223. The side plate 221 extends along the thickness direction, while the upper and lower horizontal plates 222 and 223 extend along the width direction and are spaced apart along the thickness direction. The lower horizontal plate 223 is connected to a web plate 31, and the web plate 31 is located between the upper and lower horizontal plates 222 and 223 in the thickness direction. The side plate 221, upper horizontal plate 222, and lower horizontal plate 223 surround to form a guide cavity 22a. The side plate 221 of the two envelope portions 12 defines the position of the third track 3 in the width direction, the upper horizontal plate 222 defines the position of the third track 3 in the thickness direction, and the lower horizontal plate 223 supports the third track 3. The structure of the second envelope portion 22 guides and supports the movement of the third track 3.

[0048] In one embodiment, see Appendix Figure 3 As shown, side plate 221 includes side 2211 facing the envelope portion 12 and side 2212 opposite to side 2211. Both side 2211 and side 2212 are arc-shaped structures. The envelope portion 12 includes side 3121 that abuts against side 2211 and has the same curvature. Side 2211 and side 3121 form a surface contact, resulting in a large contact area and improving the stability of the second track 2 when sliding along the first track 1. The sliding portion 32 includes side 4121 that abuts against side 2212 and has the same curvature. Side 2212 and side 4121 form a surface contact, increasing the contact area and improving the stability of the third track 3 when sliding along the second track 2.

[0049] In this embodiment, the first track 1, the second track 2, and the third track 3 are all integrally formed sheet metal parts. The integrally formed structure has high strength and can meet the load-bearing capacity of a heavy server.

[0050] In this embodiment, the first track 1, the second track 2 and the third track 3 form a three-stage slide rail. When the slide rail is extended, first, the third track 3 and the second track 2 are locked together and slide along the first track 1, and when the whole is slid to the position, the second track 2 and the first track 1 are locked, and the second track 2 cannot continue to slide, the third track 3 and the second track 2 are unlocked and slide along the second track 2 until the limit position is reached, and the extension of the slide rail is completed.

[0051] When the slide rail is retracted, the process is reversed, first, the third track 3 slides along the second track 2 until it is locked with the second track 2, at this time the third track 3 cannot continue to move relative to the second track 2, and at the same time the second track 2 and the first track 1 are unlocked, the second track 2 and the third track 3 form a whole along the first track 1 to move until the slide rail is retracted.

[0052] In order to realize the above-mentioned extension and retraction process, referring to the accompanying drawings, the friction type slide rail further comprises a first locking assembly 4 and a second locking assembly 5, the first locking assembly 4 is used for locking and unlocking the third track 3 and the second track 2, and is also used for locking and unlocking the first track 1 and the second track 2. The second locking assembly 5 is used to limit the movement distance of the first track 1 on the second track 2 when the slide rail is extended. Figure 4 The first locking assembly 4 is arranged on the web two 21, the first locking assembly 4 always slides synchronously with the second track 2, the first locking assembly 4 can be connected or separated with the first track 1 and the third track 3 to make the first track 1 and the third track 3 can be locked or unlocked with the second track 2. When the first locking assembly 4 is connected with the third track 3, the third track 3 and the second track 2 are locked, and the third track 3 and the second track 2 form a whole to slide synchronously. When the first locking assembly 4 is unlocked with the third track 3, the third track 3 can slide along the second track 2. When the first locking assembly 4 is connected with the first track 1, the second track 2 and the first track 1 are locked, and at this time the second track 2 cannot slide along the first track 1. When the first locking assembly 4 is unlocked with the first track 1, the second track 2 can slide along the first track 1.

[0053] Referring to the accompanying drawings, the first locking assembly 4 comprises a first elastic member 41 and a clamping block 42 which can reciprocate along the width direction, the two ends of the clamping block 42 along the thickness direction extend out of the web two 21, a first insertion block 13 fixed with the web one 11 is arranged between the web one 11 and the web two 21, a second insertion block 33 fixed with the web three 31 is arranged between the web two 21 and the web three 31, the first insertion block 13 and the second insertion block 33 are respectively provided with a first clamping groove 131 and a second clamping groove for the clamping block 42 to insert, and the first elastic member 41 has a pre-tightening force to push the clamping block 42 to move towards the first clamping groove 131 or the second clamping groove.

[0054] Figure 5 The first locking assembly 4 comprises a first elastic member 41 and a clamping block 42 which can reciprocate along the width direction, the two ends of the clamping block 42 along the thickness direction extend out of the web two 21, a first insertion block 13 fixed with the web one 11 is arranged between the web one 11 and the web two 21, a second insertion block 33 fixed with the web three 31 is arranged between the web two 21 and the web three 31, the first insertion block 13 and the second insertion block 33 are respectively provided with a first clamping groove 131 and a second clamping groove for the clamping block 42 to insert, and the first elastic member 41 has a pre-tightening force to push the clamping block 42 to move towards the first clamping groove 131 or the second clamping groove.​

[0055] The locking block 42 is movable to disengage from or engage with the first locking slot 131 and the second locking slot. When the locking block 42 engages with the first locking slot 131, the second track 2 and the first track 1 are locked. When the locking block 42 engages with the second locking slot, the second track 2 and the third track 3 are locked. The locking is achieved by the first elastic member 41 providing a force for the locking block 42 to move toward the first locking slot 131 or the first locking slot 131.

[0056] However, the clamping block 42 also requires other forces to overcome the elastic force of the first elastic element 41 to disengage from the first slot 131 or the second slot. In this embodiment, the inclined surface 132 is used to convert the force applied in the length direction of the track when the slide rail extends and retracts into a force in the width direction, so that the clamping block 42 can disengage from the first slot 131 or the second slot.

[0057] See appendix Figure 6 and attached Figure 7 As shown, the bottom surface of the locking block 42 away from the first elastic member 41 includes a first inclined portion 421 and a second inclined portion 422. When the friction slide rail extends and slides, the first inclined portion 421 is located in front of the second inclined portion 422, and the first inclined portion 421 and the second inclined portion 422 have opposite inclination directions. The first inclined portion 421 tilts from the side closer to the first elastic member 41 to the side away from the first elastic member 41 towards the rear of the extension and sliding direction. The two inclined portions can decompose the force in the length direction onto them into a force in the width direction that pushes the locking block 42 to overcome the elastic force of the first elastic member 41.

[0058] See appendix Figure 6 As shown, both the first and second slots include a first sidewall 1311 and a second sidewall 1312 arranged sequentially along the extension and sliding direction. The first sidewall 1311 is located in front of the second sidewall 1312 in the extension direction. The length of the first sidewall 1311 in the width direction is greater than that of the second sidewall 1312, that is, the first sidewall 1311 extends towards the first elastic member 41 from the second sidewall 1312 in the width direction. At this time, the first sidewall 1311 can limit the position of the locking block 42, so that the locking block 42 will not cross the first sidewall 1311 to disengage from the first and second slots when the slide rail extends. The locking block 42 can only cross the second sidewall 1312 to disengage from the first or second slot.

[0059] Both the first insert block 13 and the second insert block 33 include an inclined surface 132 connected to the second limiting surface. The inclined surface 132 is located behind the first and second slots when they extend and slide. The inclined surface 132 matches and abuts against the first inclined portion 421. At this time, the clamping block 42 can move towards the first elastic member 41 through the cooperation of the inclined surface 132 and the first inclined portion 421 to cross the side wall 1312 and insert into the first or second slot. The connection between the inclined surface 132 and the second limiting surface forms a corner that abuts against the second inclined portion 422. This corner, in cooperation with the second inclined portion 422, can push the clamping block 42 in the first or second slot towards the first elastic member 41 to cross the side wall 1312 and separate from the first or second slot.

[0060] In this embodiment, an inclined portion is provided on the locking block 42. In conjunction with the design of the first slot 131 and the second slot, the locking block 42 can only enter and exit the slot from one side of the first slot and the second slot, thereby realizing the locking and unlocking between the two slide rails.

[0061] During the extension process of the slide rail, firstly, the locking block 42 is engaged in the second slot, and the second track 2 and the third track 3 are fixed and slide synchronously along the first slide rail under external force. When the locking block 42 reaches the position of the first slot 131, see Appendix Figure 6 As shown, the inclined surface 132 of the first slot 131 abuts against the first inclined portion 421 and pushes the locking block 42 toward the first elastic member 41 until the locking block 42 passes over the side wall 1312 of the first slot 131 and inserts into the first slot 131. At this time, the external force continues to pull the third track, and the corner of the second slot and the second inclined portion 422 abut against and push the locking block 42 toward the first elastic member 41 until the locking block 42 passes over the side wall 1312 of the second slot to disengage from the second slot. During this process, because of the limitation of the side wall 1311 of the first slot 131, the locking block 42 will not disengage from the first slot 131. The first locking component 4 locks the second track 2 and the first track 1, and the third track 3 and the second track 2 are unlocked.

[0062] During the retraction process of the slide rail, firstly, the locking block 42 is engaged in the first slot 131. When the external force pushes the third track to move until the inclined surface 132 of the second slot and the first inclined portion 421 abut, the third track continues to be subjected to force. The inclined surface 132 of the second slot and the first inclined portion 421 cooperate to push the locking block 42 towards the first elastic member 41 until the locking block 42 passes over the side wall 1312 of the second slot and inserts into the second slot. At this time, the external force continues to push the third track, and the corner of the first slot 131 and the second inclined portion 422 abut and push the locking block 42 towards the first elastic member 41 until the locking block 42 passes over the side wall 1312 of the first slot 131 to disengage from the first slot 131. During this process, due to the limitation of the side wall 1311 of the second slot, the locking block 42 will not disengage from the second slot. The first locking component 4 locks the second track 2 and the third track 3, and the first track 1 and the second track 2 are unlocked.

[0063] In one embodiment, the bottom of the first and second slots further includes an inclined section 1313, which matches the first inclined portion 421. When the inclined section 1313 and the first inclined portion 421 abut against each other, the inclined surface 132 can also be used to push the locking block 42 to move.

[0064] A guide hole 211 extending through the web 21 along its thickness direction is provided on the web 21, and the clamping block 42 slides within the guide hole 211. The first elastic element 41 is a tension spring, with one end fixed to the guide hole 211 and the other end fixed to the clamping block 42. The guide hole 211 allows both sides of the clamping block 42 to extend out of the web 21, while also guiding the movement of the clamping block 42.

[0065] In one embodiment, see Appendix Figure 7 As shown, the clamping block 42 has guide grooves 423 on two sides in the length direction, and part of the web plate 21 at the guide hole 211 is embedded in the guide grooves 423.

[0066] In one embodiment, the second locking component 5 is located between the second web 21 and the third web 31 and can slide synchronously with the third track 3. The second locking component 5 can engage with the second track 2 to limit the extension distance of the third track 3 relative to the second track 2.

[0067] In one embodiment, see Appendix Figure 8 As shown, the second locking assembly 5 includes a second elastic member 51 and a swing plate 52 hinged to the third web plate 31. The swing plate 52 has a slit 521. A protrusion 23 fixed to the second web plate 21 is provided between the second web plate 21 and the third web plate 31. The second elastic member 51 applies a force to the swing plate 52 to make the swing plate 52 swing toward the protrusion 23 until the protrusion 23 is engaged with the slit 521.

[0068] See appendix Figure 8As shown, the web three 31 is fixed with a shaft, the swing plate 52 rotates around the shaft, and the second elastic member 51 is a coil spring. When the swing plate 52 swings under the push of the protrusion 23, the coil spring stores energy to provide a restoring force for the swing plate 52. The swing plate is provided with a limiting waist-shaped hole 523 extending in the width direction, and the web three 31 is provided with a guide member which slides in the limiting waist-shaped hole 523. Through the cooperation of the limiting waist-shaped hole 523 and the guide member, the swing distance of the swing plate 52 is limited.

[0069] The swing plate 52 also includes a bevel 522 in front of the bayonet when it is stretched and slides. When the web three 31 and the swing plate 52 connected thereto pass through the protrusion 23 on the web two 21, the bevel 522 and the protrusion 23 abut, pushing the swing plate 52 to swing, and the coil spring stores energy. Until the notch 521 is aligned with the protrusion 23, the coil spring pushes the swing plate 52 to reset until the protrusion 23 is inserted into the notch 521. At this time, the force of the coil spring presses the swing plate 52 towards the protrusion 23, thereby locking the swing plate 52 at this position, realizing the locking of the third track 3 and the second track 2.

[0070] In order to release the locking of the third track 3, the notch 521 of the swing plate 52 must pass the protrusion 23. In an embodiment of the present application, as long as the swing plate 52 is pressed to overcome the elastic force of the coil spring, the swing plate 52 can pass the protrusion 23, and the second track can be pulled out or pushed in. In an alternative embodiment, an unlocking lever can be connected to the web three 31, which can swing the swing plate 52 to overcome the force of the coil spring.

[0071] In one embodiment, referring to the accompanying Figure 1 and the accompanying Figure 2 As shown, the friction slide rail further comprises a fixing assembly 6, which comprises a first bracket 61 and a second bracket 62 slidably mounted in the first bracket 61, and the second bracket 62 is fixedly connected with the first track 1. The first bracket 61 can be fixed on the stand, and the second bracket 62 interacts along the first bracket 61, increasing a level of sliding and realizing four levels of sliding.

[0072] The first bracket 61 and the second bracket 62 are similar in structure to the second track 2 and the third track 3 respectively, and the first bracket 61 guides the second bracket 62.

[0073] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made in accordance with the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A friction slide rail characterized by: The frictional slide rail comprises: a first rail comprising a web plate one and envelope sections one extending along the thickness direction on both sides in the width direction; a second rail slidingly installed in the first rail, the second rail comprising a web plate two and envelope sections two respectively bending towards each other on both sides in the width direction, the envelope sections two forming a guide cavity, the second rail only having the envelope sections two in contact with the first rail; a third rail slidingly installed in the second rail, the third rail comprising a web plate three and a sliding section sliding in the guide cavity on both sides in the width direction, the sliding section having a thickness greater than that of the web plate three and the web plate three not being in contact with the second rail.

2. The frictional slide rail according to claim 1, characterized in that: The envelope sections two comprise side plates one extending along the thickness direction, the side plates one comprising side surfaces one facing the envelope sections one and side surfaces two opposite to the side surfaces one, the side surfaces one and the side surfaces two both being circular arc structures, the envelope sections one comprising side surfaces three abutting against the side surfaces one and having the same curvature, and the sliding section comprising side surfaces four abutting against the side surfaces two and having the same curvature.

3. The frictional slide rail according to claim 1, characterized in that: The thickness of the sliding section is 1.5-2.5 times the thickness of the web plate three.

4. The frictional slide rail according to any one of claims 1 to 3, characterized in that: The frictional slide rail further comprises a first locking assembly arranged on the web plate two, the first locking assembly sliding synchronously with the second rail, the first locking assembly being capable of being clamped with or separated from the first rail and the third rail so that the first rail and the third rail are capable of being locked or unlocked with the second rail.

5. The frictional slide rail according to claim 4, characterized in that: The first locking assembly comprises a first elastic member and a clamping block capable of reciprocating in the width direction, both ends of the clamping block extending out of the web plate two in the thickness direction, a first insertion block fixed with the web plate one being arranged between the web plate one and the web plate two, and a second insertion block fixed with the web plate three being arranged between the web plate two and the web plate three, the first insertion block and the second insertion block respectively comprising first clamping grooves and second clamping grooves for the clamping block to be inserted, and the first elastic member having a pre-tightening force for pushing the clamping block to move towards the first clamping grooves or the second clamping grooves.

6. The frictional slide rail according to claim 5, characterized in that: The bottom surface of the clamping block away from the first elastic member comprises first inclined sections and second inclined sections, the first inclined sections being located in front of the second inclined sections when the frictional slide rail is extended and sliding, and the first inclined sections and the second inclined sections being opposite in the direction of inclination, the first inclined sections being inclined towards the rear of the extension and sliding from the side close to the first elastic member to the side away from the first elastic member. The first clamping grooves and the second clamping grooves both comprise side walls one and side walls two arranged in sequence in the extension and sliding direction, the side walls one being longer in the width direction than the side walls two, the first insertion block and the second insertion block both comprising inclined surfaces connected with the side walls two, the inclined surfaces matching with and abutting against the first inclined sections, and the junction of the inclined surfaces and the side walls two forming a corner capable of abutting against the second inclined sections.

7. The frictional slide rail according to claim 5, wherein: The second web is provided with a guide hole penetrating through the second web along the thickness direction, the clamping block slides in the guide hole, the clamping block is provided with a guide slot on the two sides in the length direction, and the part of the second web at the guide hole is embedded in the guide slot.

8. The friction slide rail according to any one of claims 1-3, wherein: The friction type slide rail further comprises a second locking assembly which is located between the second web and the third web and can slide synchronously with the third rail, and the second locking assembly can be connected with the second rail to limit the extension distance of the third rail relative to the second rail.

9. The frictional slide rail according to claim 8, characterized in that: The second locking assembly comprises a second elastic member and a swing plate which is hinged with the third web, the swing plate is provided with a cutout, a protrusion which is fixed with the second web is arranged between the second web and the third web, and the second elastic member applies a force to the swing plate to swing the swing plate towards the protrusion until the protrusion is clamped in the cutout.

10. The frictional slide rail according to claim 1, characterized in that: The friction type slide rail comprises a fixing assembly which comprises a first support and a second support which is slidingly installed in the first support, and the second support is fixedly connected with the first rail.

Images