A multi-section slide rail extension and retraction mechanism

Abstract

A multi-section slide rail expansion and contraction mechanism belongs to the field of mechanical technology. The present invention comprises a multi-section slide rail system (1), an elastic belt (2), a driving wheel (3), a driving wheel shaft (4), and a storage device (5). One end of the elastic belt (2) is connected to the multi-section slide rail system (1), and the other end is stored in the storage device (5). The driving wheel shaft (4) is mounted on the multi-section slide rail system (1). The driving wheel (3) is mounted on the driving wheel shaft (4) and can rotate around it. The driving wheel (3) is in contact with the elastic belt (2). The rotation of the driving wheel (3) can drive the elastic belt (2) to move horizontally, thereby driving the multi-section slide rail system (1) to expand or contract. The present invention realizes an expansion and contraction device that can be repeatedly expanded and contracted and has controllable speed, and has the advantages of simple structure, light weight, good rigidity, etc.

Description

Technical Field

[0001] The invention relates to a multi-section slide rail extension and retraction mechanism, belonging to the technical field of machinery. Background Art

[0002] In daily life and engineering, it is often necessary to adopt a mechanical structure that can be automatically extended and retracted, such as awnings, clothes drying poles, robotic arms, etc. Multi-section slide rail mechanisms are a commonly used retractable device. However, in order to achieve automatic extension and retraction, conventional multi-section slide rail mechanisms require a drive device, such as a hydraulic mechanism, to be installed between each two adjacent slide rails. The structure is complex and the weight is heavy. Summary of the Invention

[0003] The technical problem solved by the present invention is to overcome the deficiencies of the prior art and provide an expansion and contraction device which has a simple structure, is lightweight, can be repeatedly extended and retracted, and has a controllable speed.

[0004] The technical solution of the present invention is: a multi-section slide rail expansion and contraction mechanism, including a multi-section slide rail system, an elastic belt, a driving wheel, a driving wheel shaft, and a storage device; one end of the elastic belt is connected to the multi-section slide rail system, and the other end is stored in the storage device, the driving wheel shaft is installed on the multi-section slide rail system, the driving wheel is installed on the driving wheel shaft and can rotate around it, and the driving wheel is in contact with the elastic belt; the multi-section slide rail system is composed of no less than three slide rails stacked on each other, namely, a top slide rail, a bottom slide rail and a plurality of intermediate slide rails, two adjacent slide rails are connected by a linear guide rail and can slide against each other, and at least one limiting mechanism is respectively provided on the two adjacent slide rails to prevent the two slide rails from detaching during the sliding process; the bottom slide rail and all the intermediate slide rails At the same cross-sectional position, slits are provided passing through the multi-section slide rail system along their respective sliding directions. When the multi-section slide rail system is in the folded state, the cross-section of the slits of each slide rail is combined to form a gap that matches the cross-section of the elastic band, and can accommodate the elastic band passing through the inside thereof. The elastic band is a long thin strip that can be rolled and bent under the action of external force and rebound to a straight shape in a natural state. Along its length, it is divided into a fixed end, a straight section, and a storage section, wherein the fixed end is connected to the top slide rail, the straight section passes through the slits on each slide rail of the multi-section slide rail system, and the storage section is stored in a storage device. The driving wheel shaft is installed on the bottom slide rail, and the rotation of the driving wheel can drive the straight section of the elastic band to translate, thereby driving the multi-section slide rail system to extend or retract.

[0005] Furthermore, a plurality of bosses are arranged at equal intervals on the driving wheel, and a plurality of holes arranged in a straight line are provided on the elastic belt. The size and spacing of the holes match the bosses. When the driving wheel rotates, the bosses are inserted into the holes in sequence to drive the elastic belt to translate.

[0006] Furthermore, another set of multi-section slide rail systems identical to the multi-section slide rail system may be added and used in parallel, and the top slide rails of the two sets of multi-section slide rail systems are both connected to the fixed end of the same elastic band.

[0007] Furthermore, the elastic band is made of a material with good elasticity and high yield strength, preferably steel, titanium alloy, or carbon fiber composite material.

[0008] Furthermore, the two parts of the same slide rail of the multi-section slide rail system separated by the slit are connected by a C-shaped ring, and the C-shaped rings connecting the slide rails are of different sizes and nested with each other, so that the slide rails do not interfere with each other when sliding.

[0009] Furthermore, the length direction of the elastic band and the sliding direction of the top slide rail are set to an acute angle greater than 0°, the driving wheel shaft is connected to the first steering shaft through a connecting frame, the driving wheel shaft and the first steering shaft are perpendicular to each other, the first steering shaft is perpendicular to the plane where the straight section of the elastic band is located, the first steering shaft is installed on the connecting rod, the connecting rod is fixed on the bottom slide rail, and the driving wheel can rotate freely around the axis of the first steering shaft; a second steering shaft parallel to the first steering shaft is set on the top slide rail, and the fixed end of the elastic band is connected to the second steering shaft, so that the elastic band can rotate freely around the axis of the second steering shaft.

[0010] Furthermore, the contact surfaces of the limiting mechanisms provided on the two adjacent slide rails are set as inclined surfaces. After the multi-section slide rail expansion and retraction mechanism is extended into place, the inclined surfaces of the limiting mechanisms are pressed against each other to achieve fixation between the two slide rails; the fixed end of the elastic band and the top slide rail are connected by a spring.

[0011] Furthermore, the storage device is a rotatable cylinder, and the elastic band is wound around the cylinder to achieve storage.

[0012] Furthermore, it also includes a driven wheel, on which a plurality of concave holes are arranged at equal intervals, and the concave holes and the bosses on the driving wheel engage with each other, so that the driven wheel and the driving wheel maintain reverse and uniform rotation speeds.

[0013] Furthermore, the slide rails of the two sets of multi-section slide rail systems used in parallel with the same corresponding position relationship are connected on the same side of the elastic band by a set of C-shaped rings, that is, the top slide rails of the two sets of multi-section slide rail systems are connected by a set of C-shaped rings, and the bottom slide rails of the two sets of multi-section slide rail systems are connected by another set of C-shaped rings, and the other slide rails are connected by analogy.

[0014] The advantages of the present invention compared with the prior art are:

[0015] 1. Since the present invention uses an elastic belt and a driving wheel as the driving device of the multi-section slide rail system, and the elastic belt is stored in the storage device, it has the advantages of simple structure, light weight, repeated expansion and contraction, and controllable speed;

[0016] 2. Since the present invention adopts the solution of C-shaped ring reinforcement and parallel use of multiple groups of multi-section slide rail systems, it has the advantage of a strong structure;

[0017] 3. Since the present invention adopts a limiting mechanism with an inclined surface and a spring buffer solution, it can ensure that the multi-section slide rail system is effectively limited and compressed after extension, and has the advantage of good mechanical rigidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front view of the multi-section slide rail extension and retraction mechanism of the present invention;

[0019] Figure 2 It is a left side cross-sectional view of the multi-section slide rail extension and retraction mechanism of the present invention;

[0020] Figure 3 It is a schematic diagram of the combination of the elastic belt, the driving wheel and the driven wheel of the present invention;

[0021] Figure 4 Schematic diagram of the multi-section slide rail extension and retraction mechanism of the present invention in an extended state;

[0022] Figure 5 Schematic diagram of the multi-section slide rail extension and retraction mechanism of the present invention reinforced with a C-shaped ring;

[0023] Figure 6 This is a schematic diagram of the multi-section slide rail extension and retraction mechanism of the present invention using two sets of multi-section slide rail systems connected in parallel;

[0024] Figure 7 This is a top view of the multi-section slide rail extension and retraction mechanism of the present invention, which uses two sets of mirror-symmetrically arranged multi-section slide rail systems in parallel;

[0025] Figure 8 This is a front view of the multi-section slide rail extension and retraction mechanism of the present invention, which uses two sets of mirror-symmetrically arranged multi-section slide rail systems reinforced and limited by C-shaped rings;

[0026] Figure 9 Schematic diagram of the limiting device and the pressing state of the multi-section slide rail extension and retraction mechanism of the present invention;

[0027] Figure 10 A schematic diagram of the tilted arrangement of the elastic bands of the multi-section slide rail extension and retraction mechanism of the present invention;

[0028] Figure 11 is a schematic diagram of embodiment 1 of the present invention;

[0029] Figure 12Schematic diagram of the processing of the slide rail of Example 1 of the present invention;

[0030] Figure 13 Schematic diagram of embodiment 2 of the present invention;

[0031] Figure 14 This is a schematic diagram of the processing of the slide rail of Example 2 of the present invention. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical connections; direct connections or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0035] To illustrate the technical content, structural features, achieved objectives and effects of the present invention in detail, embodiments will be described below in conjunction with the accompanying drawings.

[0036] like Figure 1 As shown, the multi-section slide rail expansion and contraction mechanism provided by the present invention comprises a multi-section slide rail system (1), an elastic belt (2), a driving wheel (3), a driving wheel shaft (4), and a storage device (5), wherein one end of the elastic belt (2) is connected to the multi-section slide rail system (1), and the other end is stored in the storage device (5), the driving wheel shaft (4) is mounted on the multi-section slide rail system (1), the driving wheel (3) is mounted on the driving wheel shaft (4) and can rotate around it, and the driving wheel (3) is in contact with the elastic belt (2).

[0037] Furthermore, the multi-section slide rail system (1) is composed of no less than three slide rails stacked on each other, namely, a top slide rail (11), a bottom slide rail (12) and a plurality of intermediate slide rails (13, 14, 15, etc.), and two adjacent slide rails are connected by a linear guide rail and can slide relative to each other.

[0038] Further, if Figure 1 and Figure 2 As shown, the bottom rail (12) and all the middle rails (13, 14, 15, ...) are provided with slits penetrating through them at the same cross-sectional position along their respective sliding directions. When the multi-section rail system (1) is in the folded state, the cross section of the gap (6) formed by the slits of each rail matches the cross section of the elastic band (2), and can accommodate the elastic band (2) passing through it.

[0039] Furthermore, the elastic band (2) is a long thin band, which is divided into a fixed end (21), a straight section (22), and a storage section (23) along its length direction, wherein the fixed end (21) is connected to the top slide rail (11), the straight section (22) passes through the slits on each slide rail of the multi-section slide rail system (1), and the storage section (23) is stored in the storage device (5); the driving wheel shaft (4) is installed on the bottom slide rail (12), and the rotation of the driving wheel (3) can drive the straight section (22) of the elastic band (2) to translate, thereby driving the multi-section slide rail system (1) to achieve extension or retraction.

[0040] Furthermore, the elastic band (2) is made of a material with good elasticity and high yield strength, preferably steel, titanium alloy, or carbon fiber composite material.

[0041] Furthermore, the elastic band (2) can be engraved with a scale for measuring length, so that the multi-section slide rail extension and retraction mechanism of the present invention has the function of measuring length.

[0042] Further, if Figure 3 As shown, a plurality of bosses (31) are provided at equal intervals on the driving wheel (3), and a plurality of holes (29) arranged in a straight line are provided on the elastic band (2). The size and spacing of the holes (29) match those of the bosses (31). When the driving wheel (3) rotates, the bosses (31) are sequentially inserted into the holes (29), thereby driving the elastic band (2) to translate.

[0043] Furthermore, a driven wheel (7) can be added, and a plurality of concave holes (71) are respectively provided on the driven wheel (7) at equal intervals. The concave holes (71) and the bosses (31) are engaged with each other, so that the driven wheel (7) and the driving wheel (3) maintain reverse and constant speed rotation. By providing the driven wheel (7), it is possible to prevent the bosses (31) from coming out of the holes (29) of the elastic belt (2) when the driving wheel (3) rotates, and at the same time reduce the sliding friction between the elastic belt (2) and the bottom slide rail (12), thereby improving the driving force of the elastic belt (2) on the multi-section slide rail system (1).

[0044] Furthermore, the storage device (5) is a rotatable cylinder, and the elastic band (2) is wound around the cylinder for storage.

[0045] The working principle of the multi-section slide rail extension and retraction mechanism is as follows: Figure 1 When the multi-section rail system (1) is in the folded state, the driving wheel (3) rotates counterclockwise, driving the elastic belt (2) to move horizontally to the right, and the top rail (11) slides to the right through the lifting of the elastic belt (2) until the multi-section rail system (1) is extended into place, as shown in FIG. Figure 4 On the contrary, when the multi-section rail system (1) is in the Figure 4 In the extended state shown, the driving wheel (3) rotates clockwise, driving the elastic belt (2) to move horizontally to the left, and the top slide rail (11) slides to the left by pulling the elastic belt (2) until the multi-section slide rail system (1) is completely retracted.

[0046] Furthermore, by adjusting the rotation speed of the driving wheel (3), the speed of extension and retraction of the multi-section slide rail system (1) can be effectively controlled, so that the multi-section slide rail system (1) can be in an extended state of any length and can be repeatedly extended and retracted. Therefore, it can be flexibly applied in various occasions, while abandoning the traditional hydraulic drive method, and has the advantages of simple structure, light weight, etc.

[0047] Further, if Figure 5 As shown, the two parts of the middle slide rail (14, 15, ...) separated by the slit can be connected by C-shaped rings (854, 855, ...) to improve the structural strength. These C-shaped rings are of different sizes and nested with each other so that the individual slide rails do not interfere with each other during sliding. Correspondingly, the bottom slide rail (12) can also be reinforced using the same method.

[0048] Further, if Figure 6 As shown, another set of multi-section rail systems (9) identical to the multi-section rail system (1) can be added and used in parallel, and the top rails (11, 91) of the two sets of multi-section rail systems are connected to the fixed end (21) of the same elastic band (2).

[0049] Furthermore, each slide rail between the multi-section slide rail system (1) and the multi-section slide rail system (9) can be connected via a C-shaped ring (861, 862, ...), such as the top slide rail (11) and the top slide rail (91) are connected via a C-shaped ring (861), and the other slide rails are connected by analogy.

[0050] Furthermore, additional multi-section slide rail systems may be added and used in parallel. By using multiple sets of multi-section slide rail systems in parallel, the structural strength of the entire unfolding and retracting mechanism may be further enhanced.

[0051] Further, if Figure 7 As shown, the multi-section slide rail system (1) and the multi-section slide rail system (9) used in parallel can be arranged in a mirror-symmetrical manner, and in this case, the top slide rail (11) and the top slide rail (91) are rigidly connected to form a whole.

[0052] Furthermore, when two sets of mirror-symmetrically arranged multi-section slide rail systems are connected in parallel, the slide rails of the two sets of multi-section slide rail systems with the same corresponding position relationship on the same side of the elastic band (2) can be connected by a set of C-shaped rings. Specifically, taking the connection of the middle slide rail as an example, refer to Figure 7 and Figure 8 The middle slide rail (13) of the multi-section slide rail system (1) and the middle slide rail (93) of the multi-section slide rail system (9) are connected by a set of C-shaped rings (831, 832), and the middle slide rail (14) of the multi-section slide rail system (1) and the middle slide rail (94) of the multi-section slide rail system (9) are connected by another set of C-shaped rings (841, 842), wherein the C-shaped ring (831) is set at the right end of the middle slide rail (13, 93). The C-ring (832) is arranged at the left end of the middle slide rail (13, 93), the C-ring (841) is arranged at the right end of the middle slide rail (14, 94), and the C-ring (842) is arranged at the left end of the middle slide rail (14, 94). The C-ring (831) and the C-ring (842) have the same height, the height of the C-ring (841) is lower than the C-ring (831), and the height of the C-ring (842) is lower than the C-ring (832). During the extension of the multi-section slide rail extension and retraction mechanism, the C-ring (841) can pass through the bottom of the C-ring (831). When the multi-section slide rail extension and retraction mechanism is extended to its full extent, the C-ring (842) and the C-ring (831) press each other to play a limiting role.

[0053] Furthermore, the multi-section slide rail extension and retraction mechanism of the present invention can also adopt a special limit and clamping device. Specifically, taking the scheme of using two sets of mirror-symmetrical multi-section slide rail systems in parallel as an example, refer to Figure 9, a limiting mechanism (111, 911) is provided on the top slide rail (11, 91), and a limiting mechanism (151, 951) is provided on the middle slide rail (15, 95), the surfaces of the limiting mechanisms (111, 151) contacting each other are set as inclined surfaces, and the surfaces of the limiting mechanisms (911, 951) contacting each other are set as inclined surfaces. After the multi-section slide rail expansion and retraction mechanism is extended to a certain position, the inclined surfaces between the limiting mechanisms are pressed against each other to achieve fixation between the two slide rails, so that the entire expansion and retraction mechanism has good rigidity; in addition, when the limiting mechanisms are pressed against each other and the driving wheel (3) stops, due to the machine The assembly gap between the mechanical structures may cause the elastic band (2) to slightly retreat, thereby affecting the mutual pressing between the limiting mechanisms. To avoid this problem, the fixed end (21) of the elastic band (2) and the top slide rails (11) and (91) are connected by a spring (24). After the limiting mechanisms are pressed against each other, the elastic band (2) continues to move to the right under the drive of the driving wheel (3) to compress the spring (24). In this way, even if the elastic band (2) slightly retreats after the driving wheel (3) stops, the pressure of the spring (24) can still keep the limiting mechanisms pressed against each other.

[0054] Further, if Figure 10 As shown, the length direction of the elastic band (2) and the sliding direction of the top slide rail (11) can be set to an acute angle greater than 0°, the driving wheel shaft (4) is connected to the first steering shaft (41) through the connecting frame (42), the driving wheel shaft (4) and the first steering shaft (41) are perpendicular to each other, the first steering shaft (41) is perpendicular to the plane where the straight section (22) of the elastic band (2) is located, the first steering shaft (41) is installed on the connecting rod (43), the connecting rod (43) is fixed on the bottom slide rail (12), and the driving wheel (3) can rotate freely around the axis of the first steering shaft (41); the top end of the top slide rail (11) is provided with a second steering shaft (44) parallel to the first steering shaft (41), and the fixed end (21) of the elastic band (2) is connected to the second steering shaft (44), so that the elastic band (2) can rotate freely around the axis of the second steering shaft (44).

[0055] During the extension process of the multi-section slide rail extension and retraction mechanism, as the top slide rail (11) slides, the angle between the elastic belt (2) and the top slide rail (11) gradually decreases, that is, the elastic belt (2) rotates relative to the top slide rail (11), and the drive wheel (3) also rotates synchronously accordingly. These rotations are achieved through the first steering shaft (41) and the second steering shaft (44).

[0056] and Figure 5 Compared with the solution in which the length direction of the elastic band (2) and the sliding direction of the top slide rail (11) are parallel to each other, the Figure 10 In the solution shown, the width of the elastic band (2) can be smaller than the total width of the gaps provided on each slide rail, which is beneficial for reducing weight.

[0057] Example 1

[0058] Figure 11 A more practical multi-section slide rail extension and retraction mechanism developed based on the above-mentioned idea comprises two sets of multi-section slide rail systems (1, 9) placed in mirror symmetry. The bottom slide rails (12, 92) and the middle slide rails (13, 14, 93, 94) in the two sets of multi-section slide rail systems are connected by a plurality of C-shaped rings (812, 813, 814, 892, 893, 894) respectively. These C-shaped rings are of different sizes and nested with each other. The top slide rails (11, 91) are in the shape of a rectangular parallelepiped. The bottom slide rails (12, 92) are rigidly connected as a whole. The top slide rails (11, 91) are connected to an elastic band (2); the cross section of the elastic band (2) along its width direction is prefabricated into an arc shape, and accordingly, the gaps (6) formed by the arrangement of the slits on each slide rail (12, 13, 14, 92, 93, 94) are also set to a matching arc shape.

[0059] The end of the top slide rail (11, 91) away from the elastic band (2) can be connected with an additional C-ring to further enhance the structural stability.

[0060] Each of the slide rails is made of aluminum alloy square tubes. Taking the middle slide rail (93) as an example, refer to Figure 12 A shallow trapezoidal groove (931) is milled in the middle of each of the four sides of the aluminum alloy square tube, so that the four protruding edges (932) can serve as guide rails for the middle slide rail (93) to contact and slide with the outer middle slide rail (94), and a slit (934) is milled in one side of the middle slide rail (93) to accommodate the elastic band (2) passing through the inside.

[0061] Furthermore, a plurality of shallow grooves (935) can be milled on the edge (932) to form a plurality of independent bosses (936). By utilizing these bosses (936) to contact the middle slide rail (94), the contact area can be further reduced, thereby reducing the sliding friction resistance.

[0062] Furthermore, a through hole (937) can be drilled on the side of the middle slide rail (93) to further reduce the weight of the slide rail.

[0063] Example 2

[0064] Figure 13Another more practical multi-section slide rail extension and retraction mechanism developed based on the above idea comprises two sets of multi-section slide rail systems (1, 9) placed in mirror symmetry. The bottom slide rails (12, 92) and the middle slide rails (13, 14, 93, 94) of the two sets of multi-section slide rail systems are connected on the same side of the elastic band (2) by a plurality of C-shaped rings (82, 83, 84). These C-shaped rings are of different sizes and nested with each other, that is, the bottom slide rails (12, 92) are connected by the C-shaped ring (82), and the other slide rails are connected by analogy; the top slide rails (11, 91) are rectangular parallelepiped, and the top slide rails (11, 91) are both connected to the elastic band (2).

[0065] Each of the slide rails is made of aluminum alloy U-shaped pipes. For example, the assembly (189) composed of the middle slide rail (13, 93) and the C-shaped ring (83) above the elastic band (2) is shown in FIG. Figure 14 A V-shaped groove (1891) is milled on the inner side of each of the two opposite sides of the aluminum alloy U-shaped tube. The V-shaped groove (1891) can serve as a guide rail for the middle slide rail (14, 94) on the inner side to contact and slide. A shallow inverted trapezoidal groove (1892, 1893) is milled on the upper and lower parts of the outer sides of the two sides, thereby forming a protruding V-shaped ridge (1894) in the middle, which can serve as a guide rail for the bottom slide rail (12, 92) on the outer side to contact and slide.

[0066] Furthermore, a plurality of shallow grooves (1895) can be milled on the V-shaped edge (1894) to form a plurality of independent bosses (1896). By utilizing these bosses (1896) to contact the bottom slide rails (12, 92), the contact area can be further reduced, thereby reducing the sliding friction resistance.

[0067] Furthermore, a through hole can be drilled at a position corresponding to the C-shaped ring to hollow out the assembly (189), thereby further reducing the weight of the slide rail.

[0068] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A multi-section slide rail extension and retraction mechanism, characterized by: The invention comprises a multi-section slide rail system (1), an elastic belt (2), a driving wheel (3), a driving wheel shaft (4), and a storage device (5); one end of the elastic belt (2) is connected to the multi-section slide rail system (1), and the other end is stored in the storage device (5); the driving wheel shaft (4) is installed on the multi-section slide rail system (1), the driving wheel (3) is installed on the driving wheel shaft (4) and can rotate around it, and the driving wheel (3) and the elastic belt (2) are in contact; the multi-section slide rail system (1) is composed of no less than three slide rails stacked on each other, namely, a top slide rail, a bottom slide rail and a plurality of intermediate slide rails, two adjacent slide rails are connected by a linear guide rail and can slide on each other, and at least one limiting mechanism is respectively provided on the two adjacent slide rails to prevent the two slide rails from detaching during the sliding process; the bottom slide rail and all the intermediate slide rails are respectively moved along their respective sliding directions at the same cross-sectional position. A slit is provided running through the multi-section rail system (1). The cross section of the slit formed by the slits of each rail in the folded state matches the cross section of the elastic band (2), and can accommodate the elastic band (2) passing through the inside thereof. The elastic band (2) is a long thin strip that can be rolled and bent under the action of an external force and rebound to a straight shape in a natural state. It is divided into a fixed end, a straight section, and a storage section along its length direction, wherein the fixed end is connected to the top rail, the straight section passes through the slits on each rail of the multi-section rail system (1), and the storage section is stored in a storage device (5). The driving wheel shaft (4) is installed on the bottom rail, and the rotation of the driving wheel (3) can drive the straight section of the elastic band (2) to move horizontally, thereby driving the multi-section rail system (1) to achieve extension or folding. The elastic band (2) is made of a material with good elasticity and high yield strength.

2. The multi-section slide rail extension and retraction mechanism according to claim 1, characterized in that: A plurality of bosses are arranged at equal intervals on the driving wheel (3), and a plurality of holes arranged in a straight line are arranged on the elastic belt (2). The size and spacing of the holes match the bosses. When the driving wheel (3) rotates, the bosses are sequentially inserted into the holes, thereby driving the elastic belt (2) to translate.

3. The multi-section slide rail extension and retraction mechanism according to claim 1, characterized in that: It is also possible to use two identical multi-section rail systems (1) in parallel. The two multi-section rail systems (1) are respectively referred to as a first multi-section rail system and a second multi-section rail system. The top rails of the first multi-section rail system and the second multi-section rail system are both connected to the fixed end of the same elastic band (2).

4. The multi-section slide rail extension and retraction mechanism according to claim 1, characterized in that: The two parts of the same slide rail of the multi-section slide rail system (1) separated by a slit are connected by a C-shaped ring, and the C-shaped rings connecting the slide rails are of different sizes and nested with each other, so that the slide rails do not interfere with each other when sliding.

5. The multi-section slide rail extension and retraction mechanism according to claim 1, characterized in that: The length direction of the elastic band (2) and the sliding direction of the top slide rail are set to an acute angle greater than 0°, the driving wheel shaft (4) is connected to the first steering shaft through a connecting frame, the driving wheel shaft (4) and the first steering shaft are perpendicular to each other, the first steering shaft is perpendicular to the plane where the straight section of the elastic band (2) is located, the first steering shaft is installed on a connecting rod, and the connecting rod is fixed on the bottom slide rail, and the driving wheel (3) can rotate freely around the axis of the first steering shaft; a second steering shaft parallel to the first steering shaft is set on the top slide rail, and the fixed end of the elastic band (2) is connected to the second steering shaft, so that the elastic band (2) can rotate freely around the axis of the second steering shaft.

6. The multi-section slide rail extension and retraction mechanism according to claim 1, characterized in that: The contact surfaces of the limiting mechanisms provided on the two adjacent slide rails are provided as inclined surfaces. After the multi-section slide rail extension and retraction mechanism is extended into position, the inclined surfaces of the limiting mechanisms are pressed against each other to achieve fixation between the two slide rails. The fixed end of the elastic band (2) and the top slide rail are connected via a spring.

7. The multi-section slide rail extension and retraction mechanism according to claim 1, characterized in that: The storage device (5) is a rotatable cylinder, and the elastic band (2) is wound around the cylinder for storage.

8. The multi-section slide rail extension and retraction mechanism according to claim 2, characterized in that: The driven wheel (7) is provided with a plurality of concave holes at equal intervals, and the concave holes and the bosses on the driving wheel (3) are engaged with each other, so that the driven wheel (7) and the driving wheel (3) maintain counter-rotating and constant speed rotation.

9. The multi-section slide rail extension and retraction mechanism according to claim 3, characterized in that: The slide rails of the first multi-section slide rail system and the second multi-section slide rail system used in parallel and having the same corresponding position relationship are respectively connected by a set of C-shaped rings at the same side of the elastic band (2), that is, the top slide rail of the first multi-section slide rail system and the top slide rail of the second multi-section slide rail system are connected by a set of C-shaped rings, and the bottom slide rail of the first multi-section slide rail system and the bottom slide rail of the second multi-section slide rail system are connected by another set of C-shaped rings, and the other slide rails are connected in the same manner.

Images