Friction type sliding rail

Abstract

The friction type sliding rail comprises a first rail body, and the first rail body comprises a first web and first enveloping parts extending 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 present invention relates to the technical field of slide rails, and particularly to a friction type slide rail. Background Art

[0002] Slide rails are commonly used in devices that can carry items and are used to enable two objects to slide relative to each other. Initially, they were mostly used in furniture such as drawers and computer keyboard trays, and later in electronic devices such as servers. Existing slide rails are divided into friction type slide rails and ball type slide rails. Ball type slide rails move smoothly, but have very high precision requirements, so their design and manufacturing costs are also relatively high. Friction type slide rails do not have any ball support components, have a simple structure, and low costs, and are widely used. However, existing friction type slide rails can achieve three-level sliding. However, since server cabinets for carrying servers also tend to be large, on the one hand, this requires the slide rails to develop towards being thinner and smaller to free up more space for carrying servers, and on the other hand, it requires the load-bearing capacity of the slide rails to be continuously improved to be able to carry larger servers. Therefore, it is necessary to improve the slide rails to increase the strength of the slide rails without additionally occupying space. Summary of the Invention

[0003] To overcome the above disadvantages, the purpose of the present invention is to provide a friction type slide rail that increases the strength without additionally occupying space.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: a friction type slide rail, comprising: A first rail, the first rail includes a first web and envelope portions one extending along the thickness direction on both sides in the width direction; A second rail, the second rail is slidably installed in the first rail, the second rail includes a second web and envelope portions two respectively bent towards each other on both sides in the width direction, the envelope portions two form a guiding cavity, and only the envelope portions two of the second rail are in contact with the first rail; A third rail, the third rail is slidably installed in the second rail, the third rail includes a third web and sliding portions sliding in the guiding cavity on both sides in the width direction, the thickness of the sliding portions is greater than the thickness of the third web and the third web is not in contact with the second rail. The beneficial effects of the present invention are as follows: The second web is not in contact with the adjacent first web and third web, and there are gaps in the thickness direction between the second web and the first web, and between the second web and the third web. On the one hand, this gap provides space for the installation of other locking components, and on the other hand, it reduces the contact area between the second rail and the first rail and the third rail, that is, reduces the frictional force during the extension and contraction of the friction type slide rail, facilitating the sliding of the slide rail.

[0005] The thickness of the sliding part of the third track is larger than that of the web three. When the sliding part slides in the guiding cavity formed by the enveloping part two, the stability of the third track is stronger. Even if the third track has a slight swing in the thickness direction, it can still slide in the sliding cavity due to the relatively thick sliding part. Furthermore, the enveloping part two includes a side plate one extending in the thickness direction. The side plate one includes a side one facing the enveloping part one and a side two opposite to the side one. Both the side one and the side two are arc structures. The enveloping part one includes a side three abutting against the side one and having the same radian. The sliding part includes a side four abutting against the side two and having the same radian.

[0006] The side one and the side three form a surface contact, with a large contact area, which improves the stability when the second track slides along the first track; the side two and the side four form a surface contact, with an increased contact area, which improves the stability when the third track slides along the second track.

[0007] Furthermore, the thickness of the sliding part is 1.5 - 2.5 times that of the web three. This range neither increases the overall thickness of the slide rail nor reduces the strength. Furthermore, the friction track further includes a first locking component. The first locking component is arranged on the web two. The first locking component can slide synchronously with the second track. The first locking component can be clamped or separated from the first track and the third track so that both the first track and the third track can be locked or unlocked with the second track.

[0008] Furthermore, the first locking component includes a first elastic member and a clamping block that can reciprocate in the width direction. Both ends of the clamping block in the thickness direction extend out of the web two. A first insertion block fixed to the web one is arranged between the web one and the web two. A second insertion block fixed to the web three is arranged between the web two and the web three. A first card slot and a second card slot for the clamping block to insert are respectively arranged on the first insertion block and the second insertion block. The first elastic member has a pre-tightening force that pushes the clamping block to move towards the first card slot or the second card slot.

[0009] The first locking component uses the cooperation of the clamping member and the card slot to realize the locking of the second track with the first slide rail and the third track respectively. Furthermore, the bottom surface of the clamping block away from the first elastic member includes a first inclined portion and a second inclined portion. When the friction slide rail extends and slides, the first inclined portion is in front of the second inclined portion and the inclination directions of the first inclined portion and the second inclined portion are opposite. The first inclined portion inclines towards the rear of the extended slide from the side close to the first elastic member to the side away from the first elastic member. The first card slot and the second card slot both include a first side wall and a second side wall arranged in sequence along the extension sliding direction. The length of the first side wall in the width direction is greater than that of the second side wall. The first plug and the second plug both include an inclined surface connected to the second side wall. The inclined surface matches and can abut against the first inclined portion, and a corner that can abut against the second inclined portion is formed at the junction of the inclined surface and the second side wall.

[0010] When the sliding rail extends and contracts, the clamping block utilizes the inclined surface to convert the acting force applied in the length direction of the track into the acting force in the width direction, so that the clamping block overcomes the elastic force of the first elastic member and disengages from the first card slot or the second card slot.

[0011] Furthermore, a guiding hole penetrating through the web two in the thickness direction is formed on the web two. The clamping block slides in the guiding hole. Guiding grooves are formed on two side surfaces of the clamping block in the length direction, and a part of the web two at the guiding hole is embedded in the guiding grooves. The guiding hole guides the movement of the clamping block.

[0012] Furthermore, the friction type sliding rail further includes 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 track. The second locking assembly can be clamped with the second track to define the extension distance of the third track relative to the second track.

[0013] Furthermore, the second locking assembly includes a second elastic member and a swing plate hinged to the web three. A notch is formed on the swing plate. A protrusion fixed to the web two is arranged between the web two and the web three. 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 notch.

[0014] Furthermore, the friction type sliding rail includes a fixing assembly. The fixing assembly includes a first bracket and a second bracket slidably installed in the first bracket. The second bracket is fixedly connected to the first track. The cooperation of the first bracket and the second bracket increases one - level sliding and realizes four - level sliding. Description of the Drawings

[0015] Figure 1 is a three - dimensional structural schematic diagram of an embodiment of the present invention; Figure 2 is a cross - sectional view of an embodiment of the present invention along the width direction; Figure 3 is Figure 2 the enlarged view at A in Figure 4 is an exploded view of an embodiment of the present invention; Figure 5 is a structural schematic diagram of the first locking assembly in an embodiment of the present invention; Figure 6 Schematic diagram of the docking of the clamping block and the first card slot in the embodiment of the present invention; Figure 7 Schematic three-dimensional structure diagram of the clamping block in the embodiment of the present invention; Figure 8 Schematic structure diagram of the second locking component in the embodiment of the present invention.

[0016] In the figure: 1. First track; 11. First web; 12. First enveloping part; 121. Third side; 13. First insertion block; 131. First card slot; 1311. First side wall; 1312. Second side wall; 1313. Inclined section; 132. Inclined plane; 2. Second track; 21. Second web; 211. Guide hole; 22. Second enveloping part; 22a. Guide cavity; 221. First side plate; 2211. First side; 2212. Second side; 222. Upper cross plate; 223. Lower cross plate; 23. Protrusion; 3. Third track; 31. Third web; 32. Sliding part; 321. Fourth side; 33. Second insertion block; 4. First locking component; 41. First elastic member; 42. Clamping block; 421. First inclined part; 422. Second inclined part; 423. Guide groove; 5. Second locking component; 51. Second elastic member; 52. Swing plate; 521. Cut; 522. Hypotenuse; 523. Limited waist-shaped hole; 6. Fixing component; 61. First bracket; 62. Second bracket. Detailed implementation manners The following elaborates on the preferred embodiments of the present invention in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0017] A friction type slide rail of the present invention, as shown in the attached Figure 1 figure, includes a first track 1, a second track 2 and a third track 3. Three-level sliding is achieved between the three tracks, and the telescopic length is relatively large. The first track 1, the second track 2 and the third track 3 all slide along the length direction to achieve the extension and contraction of the slide rail.

[0018] As shown in the attached Figure 2 figure, the first track 1 includes a first web 11 and first enveloping parts 12 extending along the thickness direction on both sides in the width direction. The cross-section of the first track 1 in the width direction is a U-shaped structure.

[0019] The second track 2 is slidably installed in the first track 1. The cross-section of the second track 2 in the width direction is also a U-shaped structure, and the opening direction of the cross-section is the same as that of the first track 1. The second track 2 includes a web two 21 and envelope portions two 22 that are bent towards each other on both sides in the width direction. The envelope portions two 22 form a guiding cavity 22a. Only the envelope portions two 22 of the second track 2 are in contact with the first track 1, that is, the web two 21 is not in contact with the first track 1, and there is a gap between the web two 21 and the web one 11.

[0020] The third track 3 is slidably installed in the second track 2. The cross-section of the third track 3 in the width direction is also a U-shaped structure, but the opening direction of the cross-section is opposite to that of the first track 1. The third track 3 includes a web three 31 and sliding portions 32 that slide in the guiding cavity 22a on both sides in the width direction. The thickness of the sliding portions 32 is greater than the thickness of the web three 31, and the web three 31 is not in contact with the second track 2, that is, only the sliding portions 32 are in contact with the second track 2.

[0021] In this embodiment, the web two 21 is not in contact with the adjacent web one 11 and web three 31. There are gaps in the thickness direction between the web two 21 and the web one 11, and between the web two 21 and the web three 31. On the one hand, this gap provides space for the installation of the first locking component 4 and the second locking component 5. On the other hand, it reduces the contact area between the second track 2 and the first track 1 and the third track 3, that is, it reduces the friction force of the friction type slide rail during the extension and contraction process, facilitating the sliding of the slide rail.

[0022] In this embodiment, because the thickness of the sliding portions 32 of the third track 3 is larger than the thickness of the web three 31, when the sliding portions 32 slide in the guiding cavity 22a formed by the envelope portions two 22, the stability of the third track 3 is stronger. Even if the third track 3 has a slight swing in the thickness direction, it can still slide in the sliding cavity due to the relatively thick sliding portions 32.

[0023] In one embodiment, the thickness of the sliding portions 32 is 1.5 - 2.5 times the thickness of the web three 31. If the thickness of the sliding portions 32 is too small, it cannot play a strengthening role, but if the sliding portions 32 are too large, it will cause an increase in the thickness of the entire slide rail.

[0024] See attached Figure 3As shown, the cross-section of the second enveloping part 22 is U-shaped. The second enveloping part 22 includes a first side plate 221, an upper cross plate 222, and a lower cross plate 223. The first side plate 221 extends in the thickness direction, and the upper cross plate 222 and the lower cross plate 223 extend in the width direction and are spaced apart in the thickness direction. The lower cross plate 223 is connected to the third web 31, and the third web 31 is located between the upper cross plate 222 and the lower cross plate 223 in the thickness direction. The first side plate 221, the upper cross plate 222, and the lower cross plate 223 surround to form a guiding cavity 22a. The first side plates 221 of the two first enveloping parts 12 define the position of the third rail 3 in the width direction, the upper cross plate 222 defines the position of the third rail 3 in the thickness direction, and the lower cross plate 223 supports the third rail 3. The structure of the second enveloping part 22 guides and supports the movement of the third rail 3.

[0025] In one embodiment, refer to the attached Figure 3 As shown, the first side plate 221 includes a first side surface 2211 facing the first enveloping part 12 and a second side surface 2212 opposite to the first side surface 2211. Both the first side surface 2211 and the second side surface 2212 are arc structures. The first enveloping part 12 includes a third side surface 121 that abuts against the first side surface 2211 and has the same curvature. The first side surface 2211 and the third side surface 121 form a surface contact, with a large contact area, which improves the stability when the second rail 2 slides along the first rail 1. The sliding part 32 includes a fourth side surface 321 that abuts against the second side surface 2212 and has the same curvature. The second side surface 2212 and the fourth side surface 321 form a surface contact, with an increased contact area, which improves the stability when the third rail 3 slides along the second rail 2.

[0026] In this embodiment, the first rail 1, the second rail 2, and the third rail 3 are all integrally formed sheet metal parts. The integrally formed structure has high strength and can meet the load-bearing requirements of a relatively heavy server.

[0027] In this embodiment, the first rail 1, the second rail 2, and the third rail 3 form a three-stage slide rail. When the slide rail extends, first, the third rail 3 and the second rail 2 are locked into a whole and slide along the first rail 1. When this whole slides in place, the second rail 2 and the first rail 1 are locked, and the second rail 2 cannot continue to slide. The third rail 3 and the second rail 2 are unlocked and slide along the second rail 2 until reaching the limit position, completing the extension of the slide rail.

[0028] When the slide rail contracts, the process is opposite. First, the third rail 3 slides along the second rail 2 until it is locked with the second rail 2. At this time, the third rail 3 can no longer move relative to the second rail 2. At the same time, the second rail 2 and the first rail 1 are unlocked, and the second rail 2 and the third rail 3 form a whole and move along the first rail 1 until the slide rail contraction is completed.

[0029] To achieve the above extension and contraction processes, refer to the attached Figure 4As shown, the friction track further includes a first locking component 4 and a second locking component 5. The first locking component 4 is used for locking and unlocking the third track 3 and the second track 2, and at the same time for locking and unlocking the first track 1 and the second track 2. The second locking component 5 is used to limit the moving distance of the first track 1 on the second track 2 when the slide rail extends.

[0030] The first locking component 4 is arranged on the second web 21. The first locking component 4 always slides synchronously with the second track 2. The first locking component 4 can be engaged or disengaged with the first track 1 and the third track 3 so that both the first track 1 and the third track 3 can be locked or unlocked with the second track 2. When the first locking component 4 is engaged 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 an integral body and slide synchronously. When the first locking component 4 is disengaged from the third track 3, the third track 3 can slide along the second track 2. When the first locking component 4 is engaged 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 component 4 is disengaged from the first track 1, the second track 2 can slide along the first track 1.

[0031] See the appendix Figure 5 As shown, the first locking component 4 includes a first elastic member 41 and a clamping block 42 that can reciprocate in the width direction. Both ends of the clamping block 42 in the thickness direction extend out of the second web 21. A first insertion block 13 fixed to the first web 11 is arranged between the first web 11 and the second web 21. A second insertion block 33 fixed to the third web 31 is arranged between the second web 21 and the third web 31. A first card slot 131 and a second card slot for the clamping block 42 to insert are respectively arranged on the first insertion block 13 and the second insertion block 33. The first elastic member 41 has a pre-tightening force to push the clamping block 42 to move towards the first card slot 131 or the second card slot.

[0032] The clamping block 42 can move to disengage from or engage with the first card slot 131 and the second card slot. When the clamping block 42 engages with the first card slot 131, the second track 2 and the first track 1 are locked. When the clamping block 42 engages with the second card slot, the second track 2 and the third track 3 are locked. By providing the acting force for the clamping block 42 to move towards the first card slot 131 or the first card slot 131 by the first elastic member 41, the locking is achieved.

[0033] However, the clamping block 42 also needs other acting forces to overcome the elastic force of the first elastic member 41 to disengage from the first card slot 131 or the second card slot. In this embodiment, by using the inclined surface 132, when the slide rail extends and contracts, the acting force applied in the length direction of the track is converted into the acting force in the width direction, so that the clamping block 42 can disengage from the first card slot 131 or the second card slot.

[0034] See the appendix Figure 6 and the appendix Figure 7As shown, the bottom surface of the clamping 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 are inclined in opposite directions. The first inclined portion 421 is inclined from the side close to the first elastic member 41 to the side away from the first elastic member 41 toward the rear of the extension and sliding. The two inclined portions can decompose the force in the length direction thereof into a force in the width direction that pushes the clamping block 42 to overcome the elastic force of the first elastic member 41 and move.

[0035] See attached Figure 6 As shown, the first clamping slot 131 and the second clamping slot both include a side wall 1311 and a side wall 1312 sequentially arranged along the extension and sliding direction, the side wall 1311 is located in front of the side wall 1312 in the extension direction, and the length of the side wall 1311 in the width direction is greater than the side wall 1312, that is, the side wall 1311 extends out of the side wall 1312 toward the first elastic member 41 in the width direction. At this time, the side wall 1311 can limit the position of the clamping block 42, so that the clamping block 42 will not pass over the side wall 1311 when the slide rail is extended to disengage from the first clamping slot and the second clamping slot, and the clamping block 42 can only pass over the side wall 1312 to disengage from the first clamping slot or the second clamping slot.

[0036] The first plug block 13 and the second plug block 33 both include an inclined surface 132 connected to the second limiting surface, and the inclined surface 132 is located behind the first card slot and the second card slot when they extend and slide. The inclined surface 132 matches and can abut against the first inclined portion 421. At this time, the clamping block 42 can move toward the first elastic member 41 through the cooperation of the inclined surface 132 and the first inclined portion 421 to cross the second side wall 1312 and insert into the first card slot or the second card slot. The connection between the inclined surface 132 and the second limiting surface forms a corner that can abut against the second inclined portion 422. This corner cooperates with the second inclined portion 422 to push the clamping block 42 in the first card slot or the second card slot to move toward the first elastic member 41 to cross the second side wall 1312 and separate from the first card slot or the second card slot.

[0037] In this embodiment, an inclined portion is provided on the clamping block 42, and the design of the first clamping slot 131 and the second clamping slot is coordinated so that the clamping block 42 can only enter and exit the slot from one side of the first clamping slot and the second clamping slot, thereby realizing locking and unlocking between the two slide rails.

[0038] During the extension of the slide rail, first, the clamping block 42 is clamped into the second clamping slot, and the second rail 2 and the third rail 3 are fixed and slide synchronously along the first slide rail under the pull of external force. Figure 6As shown, the inclined surface 132 of the first card slot 131 abuts against the first inclined portion 421 and pushes the clamping block 42 to move towards the first elastic member 41 until the clamping block 42 crosses the second side wall 1312 of the first card slot 131 and inserts into the first card slot 131. At this time, an external force continues to pull the third track, and the corner of the second card slot and the second inclined portion 422 abut against and push the clamping block 42 to move towards the first elastic member 41 until the clamping block 42 crosses the second side wall 1312 of the second card slot to disengage from the second card slot. During this process, due to the limitation of the first side wall 1311 of the first card slot 131, the clamping block 42 will not disengage from the first card slot 131, and the first locking component 4 locks the second track 2 and the first track 1, and unlocks the third track 3 and the second track 2.

[0039] During the contraction process of the slide rail, first of all, the clamping block 42 is clamped into the first card slot 131. When an external force pushes the third track to move until the inclined surface 132 of the second card slot abuts against the first inclined portion 421, and the third track continues to be stressed, the inclined surface 132 of the second card slot and the first inclined portion 421 cooperate to push the clamping block 42 to move towards the first elastic member 41 until the clamping block 42 crosses the second side wall 1312 of the second card slot and inserts into the second card slot. At this time, the external force continues to push the third track, and the corner of the first card slot 131 and the second inclined portion 422 abut against and push the clamping block 42 to move towards the first elastic member 41 until the clamping block 42 crosses the second side wall 1312 of the first card slot to disengage from the first card slot 131. During this process, due to the limitation of the first side wall 1311 of the second card slot, the clamping block 42 will not disengage from the second card slot, and the first locking component 4 locks the second track 2 and the third track 3, and unlocks the first track 1 and the second track 2.

[0040] In one embodiment, the bottom of the first card slot and the second card slot further includes an inclined section 1313, which matches the first inclined portion 421. When the inclined section 1313 abuts against the first inclined portion 421, the inclined surface 132 can also be used to push the clamping block 42 to move.

[0041] A guiding hole 211 penetrating through the web two 21 in the thickness direction is formed on the web two 21, and the clamping block 42 slides in the guiding hole 211. The first elastic member 41 is a tension spring, one end of the tension spring is fixed to the guiding hole 211, and the other end is fixed to the clamping block 42. The arrangement of the guiding hole 211 allows both sides of the clamping block 42 to extend out of the web two 21 and guides the movement of the clamping block 42 at the same time.

[0042] In one embodiment, see the appendix Figure 7 As shown, guiding grooves 423 are formed on two side surfaces of the clamping block 42 in the length direction, and a part of the web two 21 at the guiding hole 211 is embedded in the guiding grooves 423. In one embodiment, the second locking assembly 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 assembly 5 can be clamped with the second track 2 to define the extension distance of the third track 3 relative to the second track 2.

[0043] In one embodiment, see the attached 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 31. A notch 521 is formed on the swing plate 52. A protrusion 23 fixed to the second web 21 is provided between the second web 21 and the third web 31. The second elastic member 51 applies a force to the swing plate 52 to swing the swing plate 52 towards the protrusion 23 until the protrusion 23 is caught in the notch 521.

[0044] See the attached Figure 8 As shown, a shaft is fixed on the third web 31, and the swing plate 52 rotates around the shaft. 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. A limiting waist-shaped hole 523 extending in the width direction is provided on the swing partition, and a guiding member is provided on the third web 31. The guiding member slides in the limiting waist-shaped hole 523, and the swing distance of the swing plate 52 is defined by the cooperation of the limiting waist-shaped hole 523 and the guiding member.

[0045] The swing plate 52 further includes an inclined edge 522 located in front of the bayonet during the extension and sliding. When the third web 31 and the swing plate 52 connected thereto pass over the protrusion 23 on the second web 21, due to the abutment of the inclined edge 522 and the protrusion 23, the swing plate 52 is pushed 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 caught in the notch 521. At this time, the force of the coil spring presses the swing plate 52 against the protrusion 23, thereby locking the swing plate 52 in this position and realizing the locking of the third track 3 and the second track 2.

[0046] In order to release the locking of the third track 3, it is necessary to make the notch 521 of the swing plate 52 cross over the protrusion 23. In one embodiment of the present invention, as long as the swing plate 52 is simply pressed against the elastic force of the coil spring, the swing plate 52 can cross over the protrusion 23, and then the second track can be pulled out or pushed in. In an alternative embodiment, an unlocking rod can be connected to the third web 31, and the unlocking rod can toggle the swing plate 52 to swing to overcome the force of the coil spring.

[0047] In one embodiment, see the attached Figure 1 and the attached Figure 2As shown, the friction slide rail further includes a fixing component 6. The fixing component 6 includes a first bracket 61 and a second bracket 62 slidably mounted in the first bracket 61. The second bracket 62 is fixedly connected to the first rail 1. The first bracket 61 can be fixed on the vertical frame, and the second bracket 62 slides along the first bracket 61, adding one level of sliding and achieving four-level sliding.

[0048] The structures of the first bracket 61 and the second bracket 62 are similar to those of the second rail 2 and the third rail 3 respectively, and the first bracket 61 guides the second bracket 62.

[0049] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it. However, it cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A friction slide rail, characterized in that: include: A first track, the first track comprising a web 1 and an envelope 1 extending along a thickness direction on both sides in a width direction; A second track, wherein the second track is slidably mounted in the first track, the second track comprises a second web and two envelope portions bent toward each other on both sides in the width direction, the second envelope portion forming a guide cavity, and only the second envelope portion of the second track is in contact with the first track; The third track is slidably installed in the second track, and the third track includes a web three and sliding parts sliding in the guide cavity on both sides along the width direction, the thickness of the sliding part is greater than the thickness of the web three and the web three does not contact the second track.

2. The friction slide rail according to claim 1, characterized in that: The second envelope portion includes a side plate 1 extending in the thickness direction, the side plate 1 includes a side surface 1 facing the first envelope portion and a side surface 2 opposite to the first envelope portion, the first side surface and the second side surface are both arc structures, the first envelope portion includes a side surface 3 abutting against the first side surface and having the same curvature, and the sliding portion includes a side surface 4 abutting against the second side surface and having the same curvature.

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

4. The friction slide rail according to any one of claims 1 to 3, characterized in that: The friction track also includes a first locking component, which is arranged on the second web, and the first locking component slides synchronously with the second track. The first locking component can be engaged with or separated from the first track and the third track so that the first track and the third track can be locked or unlocked with the second track.

5. The friction slide rail according to claim 4, characterized in that: The first locking assembly includes a first elastic member and a clamping block that can move back and forth in the width direction, and the clamping block extends from the web 2 at both ends in the thickness direction. A first plug block fixed to the web 1 is arranged between the web 1 and the web 2, and a second plug block fixed to the web 3 is arranged between the web 2 and the web 3. The first plug block and the second plug 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 that pushes the clamping block to move toward the first clamping groove or the second clamping groove.

6. The friction slide rail according to claim 5, characterized in that: The bottom surface of the clamping block away from the first elastic member includes 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 extends and slides, and the first inclined portion and the second inclined portion have opposite inclination directions, and the first inclined portion is inclined from a side close to the first elastic member to a side away from the first elastic member toward the rear of the extension and sliding; The first card slot and the second card slot both include a side wall 1 and a side wall 2 which are sequentially arranged along the extending sliding direction, the length of the side wall 1 in the width direction is greater than that of the side wall 2, the first plug block and the second plug block both include an inclined surface connected to the side wall 2, the inclined surface matches and can abut against the first inclined portion, and the junction of the inclined surface and the side wall 2 forms a corner which can abut against the second inclined portion.

7. The friction slide rail according to claim 5, characterized in that: The web 2 is provided with a guide hole penetrating the web in the thickness direction, the clamping block slides in the guide hole, the clamping block is provided with guide grooves on two side surfaces in the length direction, and the portion of the web 2 at the guide hole is embedded in the guide groove.

8. The friction slide rail according to any one of claims 1 to 3, characterized in that: The friction slide rail also includes a second locking assembly, which is located between the second web and the third web and can slide synchronously with the third rail. The second locking assembly can be engaged with the second rail to limit the extension distance of the third rail relative to the second rail.

9. The friction slide rail according to claim 8, characterized in that: The second locking assembly includes a second elastic member and a swing plate hinged to the web three, a notch is provided on the swing plate, a protrusion fixed to the web two is provided 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 toward the protrusion until the protrusion is stuck in the notch.

10. The friction slide rail according to claim 1, characterized in that: The friction type slide rail comprises a fixing assembly, wherein the fixing assembly comprises a first bracket and a second bracket slidably mounted in the first bracket, and the second bracket is fixedly connected to the first rail.

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