Three-section slide rail device

Abstract

The application provides a three-section slide rail device, which comprises an upper rail, a middle seat and a lower rail, the upper and lower surfaces of the middle seat are provided with slide grooves with trapezoidal cross sections, the groove bottom width of the slide grooves is greater than the width of the groove mouth, the upper rail and the lower rail are respectively provided with slide rail parts matched with the slide grooves, an upper limiting structure is arranged between the upper rail and the middle seat to limit the maximum stroke of the upper rail relative to the middle seat, and a lower limiting structure is arranged between the lower rail and the middle seat to limit the maximum stroke of the middle seat relative to the lower rail. By adopting the technical scheme, the three-section slide rail device has high bearing capacity and is suitable for heavy load conditions.

Description

Technical Field

[0001] The invention relates to a three-section slide rail device, belonging to the technical field of ball-type heavy-duty slide rails. Background Art

[0002] Three-section slides are commonly used in pull-out equipment and consist of an inner rail (movable rail), a middle rail, and an outer rail (fixed rail). Compared to two-section slides, three-section slides have the advantage of a longer travel. For example, Chinese patent document CN216554967U discloses a heavy-duty aluminum alloy three-section slide. Existing three-section slides, due to the built-in ball bearings, inevitably carry the risk of ball bearings falling off or breaking, especially in the vibration environment of a vehicle, which can easily damage the ball bearings and render the slide unusable. In outdoor environments, humid and dusty conditions accelerate ball bearing aging and wear, resulting in reduced slide performance and a lifespan that is easily affected by the environment. Reliability is low, and the complex, multi-gap structure is susceptible to contamination from outdoor dust, especially mud and sand, which can cause slide failure and inconvenience in maintenance. Summary of the Invention

[0003] Therefore, the purpose of the present invention is to provide a three-section heavy-duty slide rail device, which is composed of three sections of grooved slide rails, has a strong load-bearing capacity, eliminates the built-in ball structure, and is therefore highly reliable and suitable for complex field environments.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a three-section slide rail device, including an upper rail, a middle seat and a lower rail. The upper and lower surfaces of the middle seat are provided with slide grooves with trapezoidal cross-sections, and the groove bottom width of the slide groove is greater than the width of the groove mouth. Slide rail parts matching the slide grooves are respectively provided on the upper rail and the lower rail; an upper limit structure is provided between the upper rail and the middle seat to limit the maximum stroke of the upper rail relative to the middle seat, and a lower limit structure is provided between the lower rail and the middle seat to limit the maximum stroke of the middle seat relative to the lower rail.

[0005] The upper limit structure includes a first limit screw and a second limit screw respectively screwed and fixed at both ends of the upper rail, and a first stop portion and a second stop portion are provided on the middle seat. When the upper rail is pulled outward relative to the middle seat to the maximum stroke position, the first limit screw abuts on the first stop portion, and when the upper rail is reset to a position overlapping with the middle seat, the second limit screw abuts on the second stop portion.

[0006] An upper clearance groove for accommodating a first limiting screw and a second limiting screw is provided on the middle seat, an upper stop block is provided in the upper clearance groove, and a first stop portion and a second stop portion are located on both sides of the upper stop block.

[0007] The lower limit structure includes a third limit screw and a fourth limit screw respectively screwed and fixed at both ends of the middle seat, and a third stop portion and a fourth stop portion are provided on the lower rail. When the middle seat is pulled outward to the maximum stroke position relative to the lower rail, the third limit screw abuts on the third stop portion, and when the middle seat is reset to a position overlapping with the lower rail, the fourth limit screw abuts on the fourth stop portion.

[0008] A lower clearance groove for accommodating the third limiting screw and the fourth limiting screw is provided on the lower rail, a lower stopper is provided in the lower clearance groove, and the third stopper and the fourth stopper are located on both sides of the lower stopper.

[0009] The three-section slide rail device further includes a locking mechanism, which is used to self-lock when the three-section slide rail device is at the maximum stroke position and the minimum stroke position.

[0010] A receiving groove is provided on the side wall of the middle seat, and the locking mechanism is provided in the receiving groove; the locking mechanism includes a connecting rod, a compression spring and an upper pin block and a lower pin block located at both ends of the connecting rod; the middle part of the connecting rod is rotatably mounted on the middle seat, and an upper through hole and a lower through hole for the upper pin block and the lower pin block to pass through are respectively provided on the two side walls of the receiving groove; a first locking hole and a second locking hole for inserting the upper pin block are provided on the upper rail, and a third locking hole and a fourth locking hole for inserting the lower pin block are provided on the lower rail; the compression spring presses against the connecting rod so that the upper pin block and the lower pin block always have a tendency to pass outward from the upper through hole and the lower through hole.

[0011] One end of the compression spring is fixed on the side wall of the accommodating groove, and the other end is inserted into the pin hole on the connecting rod.

[0012] A pressing handle is provided at one end of the connecting rod.

[0013] A trim strip is provided in the slide groove, and a trim strip fixing screw is provided on the middle seat.

[0014] By adopting the above technical solution, the three-section slide rail device of the present invention has the following beneficial effects compared with the prior art:

[0015] 1. The upper rail, middle seat and lower rail are stacked on each other, and the slide groove with a trapezoidal cross section and the slide rail part cooperate with each other, which has a high load-bearing capacity and is suitable for heavy-load equipment.

[0016] 2. Strong anti-seismic ability, the load-bearing parts are all structural parts, which will not be damaged by vibration, and are suitable for outdoor vehicles;

[0017] 3. The structure is simple and reliable, not easy to be embedded in mud and sand, easy to maintain, highly adaptable to the environment, less affected by high humidity and dusty conditions, and not easy to affect the service life.

[0018] 4. Strong maintainability, the open design makes the operation and movement of the slide easy to observe, convenient for evaluating problems and replacing parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-section structure of the three-section slide rail device of the present invention when it is in the storage state.

[0020] Figure 2 It is a schematic diagram of the three-section structure of the slide rail device when it is in a stretched state.

[0021] Figure 3 It is a side view of the three-section slide rail assembly.

[0022] Figure 4 This is the front view of the three-section slide assembly.

[0023] Figure 5 It is a partial cross-sectional view of a three-section slide rail assembly.

[0024] Figure 6 for Figure 5 A partial enlarged view of part A.

[0025] Figure 7 for Figure 5 A partial enlarged view of part B in FIG.

[0026] Figure 8 This is a schematic diagram of the state where the upper pin block is separated from the upper rail.

[0027] Figure 9 This is a schematic diagram of the state where the lower pin block is separated from the lower rail.

[0028] Figure 10 This is the main view of the three-section slide rail device in the stretched state.

[0029] Figure 11 This is a schematic diagram of the state in which the lower pin block locks the lower rail when the three-section slide rail device is in the stretched state.

[0030] Figure 12 This is a schematic diagram of the upper pin block locking the upper rail when the three-section slide rail device is in a stretched state. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] like Figure 1-3As shown, a three-section slide rail device of the present invention includes an upper rail 1, a middle seat 2, and a lower rail 3. The upper and lower surfaces of the middle seat 2 are both provided with a slide groove 21 with a trapezoidal cross-section. The bottom width of the slide groove 21 is greater than the width of the slot opening. The upper rail 1 and the lower rail 3 are respectively provided with a slide rail portion 10 that cooperates with the slide groove 21. The cross-section of the slide rail portion 10 is also trapezoidal. When the slide rail portion 10 is inserted into the slide groove 21, it can move linearly along the direction of the slide groove 21 and is restricted by the trapezoidal structure and will not fall out. A slat 4 is provided in the slide groove 21. The slat 4 is used to adjust the gap between the upper rail 1, the middle seat 2, and the lower rail 3. The middle seat 2 is provided with a slat stop screw 5 for retaining the slat 4 within the slide groove 21.

[0033] An upper limit structure is provided between the upper rail 1 and the middle seat 2 for limiting the maximum stroke of the upper rail 1 relative to the middle seat 2, and a lower limit structure is provided between the lower rail 3 and the middle seat 2 for limiting the maximum stroke of the middle seat 2 relative to the lower rail 3.

[0034] In this embodiment, if Figure 4-7 As shown, the upper limit structure includes a first limit screw 61 and a second limit screw 62 respectively screwed and fixed at both ends of the upper rail 1, and a first stop portion 201 and a second stop portion 202 are provided on the middle seat 2. When the upper rail 1 is pulled outward relative to the middle seat 2 to the maximum stroke position, the first limit screw 61 abuts on the first stop portion 201. When the upper rail 1 is reset to a position overlapping with the middle seat 2, the second limit screw 62 abuts on the second stop portion 202.

[0035] An upper clearance groove 22 for accommodating the first limiting screw 61 and the second limiting screw 62 is provided on the middle seat 2 , an upper stop block 221 is provided in the upper clearance groove 22 , and a first stop portion 201 and a second stop portion 202 are located on both sides of the upper stop block 221 .

[0036] The lower limit structure includes a third limit screw 63 and a fourth limit screw 64 respectively screwed and fixed at both ends of the middle seat 2, and a third stop portion 301 and a fourth stop portion 302 are provided on the lower rail 3. When the middle seat 2 is pulled outward to the maximum stroke position relative to the lower rail 3, the third limit screw 63 abuts on the third stop portion 301, and when the middle seat 2 is reset to a position overlapping with the lower rail 3, the fourth limit screw 64 abuts on the fourth stop portion 302.

[0037] A lower clearance groove 31 for accommodating the third limiting screw 63 and the fourth limiting screw 64 is provided on the lower rail 3 . A lower stopper 311 is provided in the lower clearance groove 31 . The third stopper 301 and the fourth stopper 302 are located on both sides of the lower stopper 311 .

[0038] In order to prevent the limit screws from accidentally failing, a safety screw 65 is arranged next to each limit screw to prevent the upper rail 1, the middle seat 2 and the lower rail 3 from separating from each other.

[0039] The three-section slide rail device further includes a locking mechanism, which is used to self-lock when the three-section slide rail device is at the maximum stroke position and the minimum stroke position.

[0040] A receiving groove 23 is provided on the side wall of the middle seat 2, and the locking mechanism is provided in the receiving groove 23; the locking mechanism includes a connecting rod 71, a compression spring 72, and an upper pin block 73 and a lower pin block 74 located at both ends of the connecting rod 71. The middle part of the connecting rod 71 is rotatably mounted on the middle seat 2 by a plug screw 75. An upper through hole 231 and a lower through hole 232 for the upper pin block 73 and the lower pin block 74 to pass through are respectively provided on the two side walls of the receiving groove 23. A first locking hole 101 and a second locking hole 102 for inserting the upper pin block 73 are provided on the upper rail 1, and a third locking hole 303 and a fourth locking hole 304 for inserting the lower pin block 74 are provided on the lower rail 3. One end of the compression spring 72 is fixed to the side wall of the accommodating groove 23, and the other end is inserted into the pin hole 711 on the connecting rod 71. The compression spring 72 presses against the connecting rod 71 so that the upper pin block 73 and the lower pin block 74 always have a tendency to pass outward from the upper through hole 231 and the lower through hole 232.

[0041] A pressing handle 76 is provided at one end of the connecting rod 71. When unlocking, the connecting rod 71 can be pressed by the pressing handle 76, so that the upper pin block 73 and the lower pin block 74 are respectively disengaged from the first locking hole 101 of the upper rail 1 and the third locking hole 303 of the lower rail 3. Figure 8 、 9 Then the upper rail 1 can be pulled outward to stretch the entire three-section slide assembly. When the three-section slide assembly is stretched to the maximum travel position, as shown in FIG. Figure 10-12 As shown, under the reset action of the compression spring 72, the upper pin block 73 and the lower pin block 74 respectively enter the second locking hole 102 of the upper rail 1 and the fourth locking hole 304 of the lower rail 3, thereby locking the three-section slide rail device in this position to achieve self-locking.

[0042] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A three-section slide rail device, characterized in that: The utility model comprises an upper rail, a middle seat and a lower rail. The upper and lower surfaces of the middle seat are both provided with a slide groove with a trapezoidal cross section. The width of the groove bottom of the slide groove is greater than the width of the slot. The upper rail and the lower rail are respectively provided with a slide rail portion that matches the slide groove. An upper limit structure is provided between the upper rail and the middle seat to limit the maximum stroke of the upper rail relative to the middle seat. A lower limit structure is provided between the lower rail and the middle seat to limit the maximum stroke of the middle seat relative to the lower rail. The upper limit structure includes a first limit screw and a second limit screw respectively screwed and fixed at both ends of the upper rail, and a first stop portion and a second stop portion are provided on the middle seat. When the upper rail is pulled outward relative to the middle seat to the maximum stroke position, the first limit screw abuts against the first stop portion, and when the upper rail is reset to a position overlapping with the middle seat, the second limit screw abuts against the second stop portion; The lower limit structure includes a third limit screw and a fourth limit screw respectively screwed and fixed at both ends of the middle seat, and a third stop portion and a fourth stop portion are provided on the lower rail. When the middle seat is pulled outward to the maximum stroke position relative to the lower rail, the third limit screw abuts on the third stop portion, and when the middle seat is reset to a position overlapping with the lower rail, the fourth limit screw abuts on the fourth stop portion.

2. The three-section slide rail device according to claim 1, wherein: An upper clearance groove for accommodating a first limiting screw and a second limiting screw is provided on the middle seat, an upper stop block is provided in the upper clearance groove, and a first stop portion and a second stop portion are located on both sides of the upper stop block.

3. The three-section slide rail device according to claim 1, wherein: A lower clearance groove for accommodating the third limiting screw and the fourth limiting screw is provided on the lower rail, a lower stopper is provided in the lower clearance groove, and the third stopper and the fourth stopper are located on both sides of the lower stopper.

4. The three-section slide rail device according to any one of claims 1 to 3, characterized in that: The three-section slide rail device further includes a locking mechanism, which is used to self-lock when the three-section slide rail device is at the maximum stroke position and the minimum stroke position.

5. The three-section slide rail device according to claim 4, characterized in that: A receiving groove is provided on the side wall of the middle seat, and the locking mechanism is provided in the receiving groove; the locking mechanism includes a connecting rod, a compression spring and an upper pin block and a lower pin block located at both ends of the connecting rod; the middle part of the connecting rod is rotatably mounted on the middle seat, and an upper through hole and a lower through hole for the upper pin block and the lower pin block to pass through are respectively provided on the two side walls of the receiving groove; a first locking hole and a second locking hole for inserting the upper pin block are provided on the upper rail, and a third locking hole and a fourth locking hole for inserting the lower pin block are provided on the lower rail; the compression spring presses against the connecting rod so that the upper pin block and the lower pin block always have a tendency to pass outward from the upper through hole and the lower through hole.

6. The three-section slide rail device according to claim 5, characterized in that: One end of the compression spring is fixed on the side wall of the accommodating groove, and the other end is inserted into the pin hole on the connecting rod.

7. The three-section slide rail device according to claim 5, wherein: A pressing handle is provided at one end of the connecting rod.

8. The three-section slide rail device according to any one of claims 1 to 3, characterized in that: A trim strip is provided in the slide groove, and a trim strip fixing screw is provided on the middle seat.

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