CN114060664A - Adjustable bracket - Google Patents

Abstract

The utility model relates to a support with adjustable, it include the bottom plate with the activity set up in the rack adjustment mechanism of bottom plate, adjusting gear mechanism includes two sets of centre gripping rack subassembly and gear knob, the gear knob is located the center of bottom plate, it is two sets of centre gripping rack subassembly follows respectively the diagonal of bottom plate slides and sets up, every group centre gripping rack subassembly all includes two rack arms, two the rack arm with the gear knob is central symmetry setting for the center, the rack arm with the gear knob meshing, the rack arm slide set up in the bottom plate, every the rack arm all corresponds and is provided with card clamping part, every the card clamping part is kept away from in the rack arm that corresponds the one end of gear knob, four card clamping part is the rectangular array and distributes, four be formed with the centre gripping position between the card clamping part. This application has the effect of being convenient for adjust centre gripping position size.

Description

Adjustable bracket

Technical Field

The application relates to the technical field of supports, in particular to an adjustable support.

Background

With the development of science and technology, people have increasingly wide application to various intelligent mobile terminal devices, and particularly, electronic devices such as mobile phones and tablet computers become indispensable tools for everyone gradually. People are easy to fatigue when using the devices to watch videos, and are inconvenient to view navigation when driving. In order to facilitate the operation of the mobile phone or tablet, people often mount the mobile phone or tablet on a support for supporting the mobile phone or tablet.

In the related art, the shape and the size of the support clamping position are not convenient to adjust, and the support clamping position can only clamp a matched mobile phone or tablet and cannot be universally used for all mobile phones or tablets on the market. When equipment with other sizes needs to be fixed, corresponding supports need to be purchased. Therefore, the range of applicability of such a stent is limited.

With respect to the related art described above, there is a drawback that it is inconvenient to adjust the size of the grip position.

Disclosure of Invention

In order to facilitate the size of adjusting the centre gripping position, this application provides an adjustable support.

The application provides a support with adjustable adopts following technical scheme:

an adjustable stand, comprising:

a base plate;

the rack adjusting mechanism is movably arranged on the bottom plate, the adjusting gear mechanism comprises two groups of clamping rack assemblies and a gear knob, the gear knob is located at the center of the bottom plate and is two groups of the clamping rack assemblies are respectively arranged on the diagonal of the bottom plate in a sliding mode, each group of the clamping rack assemblies respectively comprise two rack arms and two rack arms, the rack arms are arranged in a central symmetry mode by taking the gear knob as the center, the rack arms are meshed with the gear knob, the rack arms are arranged on the bottom plate in a sliding mode and are each correspondingly provided with a clamping portion, each clamping portion is located on the corresponding rack arm and is far away from one end of the gear knob, the clamping portions are distributed in a rectangular array mode, and the clamping portions are formed between the clamping portions.

Through adopting above-mentioned technical scheme, when the gear knob rotated, the gear knob drove the rack arm simultaneous movement of two sets of centre gripping rack assembly to make two rack arms of every group centre gripping rack assembly use the gear knob as the center and be close to each other or keep away from along the bottom plate diagonal place direction that corresponds. Because one end of each rack arm is provided with the clamping part, when the rack arms move, the clamping parts move along with the rack arms, so that the distance between the adjacent clamping parts of the four rack arms is changed simultaneously, the size of the clamping position is changed, and the bracket is suitable for products with different sizes.

When the support is used for clamping the required equipment, the gear knob is rotated to adjust the clamping position to a proper position, and four corners of the electronic equipment are clamped on the four clamping parts of the support respectively, so that the clamped equipment is fixed at the clamping position.

Optionally, each rack arm is correspondingly provided with a sliding adjusting mechanism for driving the two adjacent clamping parts to approach or separate from each other, and the clamping parts are arranged on the sliding adjusting mechanisms on the corresponding rack arms.

By adopting the technical scheme, when the clamping rack assembly is adjusted to ensure that the clamping position cannot be adjusted to the required size, the sliding adjusting mechanism can be adjusted to drive the corresponding clamping parts to move so as to change the distance between the clamping parts, thereby further adjusting the size of the clamping position. This technical scheme can adjust the size of centre gripping position through sliding adjustment mechanism to the equipment size scope that makes this support adaptation is wider.

Optionally, the sliding adjustment mechanism includes a lateral slider and a longitudinal slider, the holding portion is disposed on the corresponding longitudinal slider, the longitudinal slider is slidably disposed on the lateral slider, the lateral slider is slidably disposed on an end of the corresponding rack arm away from the gear knob, a sliding direction of the lateral slider is perpendicular to a sliding direction of the longitudinal slider, each lateral slider is aligned with a sliding trajectory of one adjacent lateral slider and parallel with a sliding trajectory of another adjacent lateral slider, and each longitudinal slider is aligned with a sliding trajectory of one adjacent longitudinal slider and parallel with a sliding trajectory of another adjacent longitudinal slider.

By adopting the technical scheme, when the position of the rack arm is kept unchanged, the transverse sliding piece is slid, and the transverse sliding piece drives the longitudinal sliding piece and the clamping part on the longitudinal sliding piece to move so that the clamping part slides along the sliding direction of the transverse sliding piece, and the clamping position is expanded or contracted along the moving direction of the transverse sliding piece; when the positions of the rack arm and the transverse slide are unchanged, the longitudinal slide is slid, and the longitudinal slide drives the corresponding clamping part to move along the direction vertical to the sliding direction of the transverse slide, so that the clamping position is expanded or contracted along the moving direction of the longitudinal slide. The transverse slide piece and the longitudinal slide piece are arranged, so that the clamping parts can independently move in two directions perpendicular to each other, and the distance between two adjacent clamping parts can be respectively adjusted, so that the support can be adapted to equipment with different length-width ratios.

Optionally, the two cross slides with the same sliding track on the same straight line are provided with a cross linkage piece for driving the two cross slides to slide towards the mutual approaching direction or the mutual departing direction simultaneously.

By adopting the technical scheme, the two transverse sliding pieces with sliding tracks on the same straight line can move simultaneously due to the arrangement of the transverse linkage piece, and when one transverse sliding piece slides, the other transverse sliding piece slides towards the opposite direction under the action of the linkage piece, so that the two transverse sliding pieces connected to the same transverse linkage piece are close to or far away from each other. The transverse linkage piece is arranged to enable the two transverse slide pieces to move simultaneously, so that the distance between the clamping parts can be adjusted conveniently, and the size of the clamping position can be changed.

Optionally, the transverse linkage member includes two transverse hinged rods, one end of each of the two transverse hinged rods is hinged to each other, the other end of each of the two transverse hinged rods is hinged to two transverse sliders on the same straight line with the sliding tracks, the sliding tracks are parallel to each other, first telescopic rods are further arranged on the two adjacent transverse sliders, and two ends of each first telescopic rod are connected to the two transverse sliders respectively.

By adopting the technical scheme, when one transverse sliding piece slides, the transverse hinge rod connected with the transverse sliding block moves to enable the other transverse hinge rod to move, so that the transverse sliding piece hinged with the other transverse hinge rod is driven to move; meanwhile, under the connecting action of the first telescopic rod, when one of the transverse sliding pieces slides, the sliding tracks are parallel to each other, and two adjacent transverse sliding pieces synchronously move. In the technical scheme, when one of the transverse sliding pieces is moved, other transverse sliding pieces can move simultaneously under the action of the transverse hinge rod and the first telescopic rod, so that the clamping parts positioned on different rack arms can move simultaneously along the sliding direction of the corresponding transverse sliding piece.

Optionally, the two longitudinal slides with the same sliding track on the same straight line are provided with longitudinal linkage parts for driving the two longitudinal slides to slide towards the mutual approaching direction or the mutual departing direction simultaneously.

By adopting the technical scheme, the two longitudinal sliders with the sliding tracks on the same straight line can simultaneously slide towards the directions close to or away from each other by the arrangement of the longitudinal linkage piece, so that the distance between the clamping parts along the sliding direction of the longitudinal slider is changed, and the clamping parts on different rack arms can conveniently move simultaneously along the sliding direction of the longitudinal slider to change the size and the shape of the clamping position.

Optionally, the longitudinal linkage member includes two longitudinal hinge rods, one end of each of the two longitudinal hinge rods is hinged to each other, the other end of each of the two longitudinal sliding blocks is hinged to each of two longitudinal sliding pieces on the same straight line along with the sliding track, the sliding tracks are parallel to each other, a second telescopic rod is further arranged on each of the two adjacent longitudinal sliding pieces, and two ends of each second telescopic rod are connected to the two longitudinal sliding pieces respectively.

Through adopting above-mentioned technical scheme, the setting of two vertical hinged rod makes two longitudinal sliders of slip orbit in same straight line can remove simultaneously, and the connection effect of second telescopic rod makes two longitudinal sliders that the slip orbit is parallel to each other and adjacent can remove simultaneously to when adjusting one of them longitudinal slider, alright make four longitudinal slider remove simultaneously, so that the regulation of centre gripping position size.

Optionally, each rack arm is provided with a guide hole for limiting the sliding direction of the rack arm, the bottom plate is provided with a guide post matched with the guide hole in a sliding manner, the guide posts correspond to the guide holes one to one, and the guide posts are sleeved on the corresponding guide holes.

Through adopting above-mentioned technical scheme, when the rack arm slided, the guide post slided in the guiding hole for the rack arm can slide along the direction of guiding hole, thereby restriction rack arm's the direction of sliding makes rack arm can steady motion.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the gear knob is rotated, the rack arm slides and can drive the clamping part on the rack arm to move, so that the distance of the clamping position directly pressed is changed, and the size of the clamping position is changed;

2. the arrangement of the transverse sliding piece and the longitudinal sliding piece ensures that when the position of the rack arm is kept unchanged, the position of the clamping part can be adjusted by adjusting the positions of the transverse sliding piece and the longitudinal sliding piece so as to achieve the purpose of adjusting the size of the clamping position, thereby improving the flexibility of adjusting the size of the clamping position and improving the equipment size universality of the support adaptation;

3. the arrangement of the transverse linkage piece and the longitudinal linkage piece enables the clamping parts of different rack arms to move simultaneously, so that the clamping parts can be adjusted conveniently.

Drawings

FIG. 1 is a schematic illustration of an explosive structure according to an embodiment of the present application;

FIG. 2 is a schematic structural view of a rack adjustment mechanism according to an embodiment of the present application;

fig. 3 is a schematic structural diagram illustrating a sliding adjustment mechanism according to an embodiment of the present application.

Description of reference numerals:

1. a base plate; 11. a guide post;

2. a rack adjustment mechanism; 21. clamping the rack assembly; 211. a rack arm; 2111. a guide hole; 2112. a straight tooth portion; 2113. a connecting portion; 2114. an installation part; 2115. a transverse chute; 22. a gear knob;

3. a chucking section;

4. a clamping position;

5. a slide adjustment mechanism; 51. a lateral slide; 511. a longitudinal chute; 512. a transverse guide block; 513. a first lateral slider; 514. a second lateral slider; 515. a third transverse slide block; 516. a fourth lateral slider; 52. a longitudinal slide; 521. a longitudinal guide block; 522. a first longitudinal slide; 523. a second longitudinal slide; 524. a third longitudinal slide; 525. a fourth longitudinal slide;

6. a transverse linkage; 61. a transverse hinge bar; 62. a first telescopic rod;

7. a longitudinal linkage; 71. a longitudinal hinge rod; 72. a second telescopic rod;

8. a lateral guide mechanism; 81. a support bar; 82. a guide bar;

9. a longitudinal guide mechanism;

10. and a support plate.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses support with adjustable. Referring to fig. 1, an adjustable stand includes a base plate 1, a rack adjustment mechanism 2, and a slide adjustment mechanism 5.

Referring to fig. 1, a base plate 1 is substantially rectangular to have a wide side and a narrow side, and a rack adjusting mechanism 2 is movably provided to the base plate 1. The rack adjusting mechanism 2 comprises two groups of clamping rack assemblies 21 and a gear knob 22, the gear knob 22 is located at the center of the bottom plate 1, and one end of the gear knob 22 extends to one side of the bottom plate 1 far away from the rack arm 211. The two groups of clamping rack assemblies 21 are respectively arranged along two diagonal lines of the bottom plate 1 in a sliding manner, and the two groups of clamping rack assemblies 21 are positioned in two planes which are parallel to each other. Each group of clamping rack assemblies 21 comprises two rack arms 211, and the two rack arms 211 of each group of clamping rack assemblies 21 are arranged in central symmetry by taking the gear knob 22 as a center. The clamping parts 3 are mounted at one end, far away from the gear knob 22, of each rack arm 211, the four clamping parts 3 are distributed in a rectangular array, and clamping positions 4 are formed among the four clamping parts 3. Referring to fig. 2, in the present embodiment, the rack arm 211 is substantially flat, and the rack arm 211 includes a straight tooth portion 2112, a connecting portion 2113, and a mounting portion 2114 that are integrally formed. The straight tooth portion 2112 has gear teeth for meshing with the gear knob 22, the connecting portion 2113 is located between the straight tooth portion 2112 and the mounting portion 2114, and the mounting portion 2114 is located at an end of the corresponding rack arm 211 remote from the gear knob 22.

Referring to fig. 1 and 2, in order to restrict the movement direction of the rack arms 211, a guide hole 2111 is formed in a connecting portion 2113 of each rack arm 211 along a diagonal direction of the base plate 1, a guide post 11 for slidably engaging with the guide hole 2111 is formed in the base plate 1, and the guide posts 11 correspond to the guide holes 2111 one to one. In this embodiment, the guide holes 2111 are waist-shaped holes, the guide posts 11 are sleeved in the corresponding guide holes 2111, and when the rack arm 211 slides, the guide posts 11 slide along the guide holes 2111, so that the rack arm 211 slides along the diagonal direction of the base plate 1.

Referring to fig. 1 and 3, the slide adjusting mechanisms 5 correspond one-to-one to the rack arms 211, i.e., the number of the slide adjusting mechanisms 5 is four. Each slide adjusting mechanism 5 is provided on the corresponding rack arm 211, the catches 3 are provided on the slide adjusting mechanisms 5 on the corresponding rack arms 211, and the slide adjusting mechanisms 5 are used for driving the adjacent two catches 3 to approach or move away from each other.

Referring to fig. 1 and 3, the sliding adjustment mechanism 5 includes a lateral slider 51 and a longitudinal slider 52, the lateral slider 51 is slidably disposed on the mounting portion 2114, the longitudinal slider 52 is slidably disposed on the lateral slider 51, and the holding portion 3 is fixedly mounted on the corresponding longitudinal slider 52. In the present embodiment, the lateral slide 51 and the longitudinal slide 52 are each arranged in a substantially rectangular block shape. The sliding direction of the transverse slide piece 51 is vertical to the sliding direction of the longitudinal slide piece 52.

Referring to fig. 1 and 3, a lateral sliding slot 2115 is provided on a surface of the mounting portion 2114 adjacent to the lateral slider 51, and a lateral guide block 512 is slidably provided in the lateral sliding slot 2115, wherein the lateral guide block 512 is fixedly connected to a side of the lateral slider 51 adjacent to the mounting portion 2114. When the lateral guide block 512 slides in the lateral slide slot 2115, the lateral slider 51 slides with respect to the mounting portion 2114. A longitudinal sliding slot 511 is arranged at one side of the transverse sliding piece 51 close to the longitudinal sliding piece 52, a longitudinal guide block 521 is arranged in the longitudinal sliding slot 511, and the longitudinal guide block 521 is arranged at the surface of the longitudinal sliding piece 52 close to the transverse sliding piece 51. When the longitudinal guide block 521 slides in the longitudinal sliding slot 511, the longitudinal slide 52 slides relative to the transverse slide 51.

Referring to fig. 1 and 3, the lateral slides 51 of the four sliding adjustment mechanisms 5 are respectively a first lateral slide 513, a second lateral slide 514, a third lateral slide 515 and a fourth lateral slide 516, the first lateral slide 513 and the second lateral slide 514 are respectively located on the mounting portions 2114 of the two rack arms 211 in one of the rack clamping assemblies, and the third lateral slide 515 and the fourth lateral slide 516 are respectively located on the mounting portions 2114 of the two rack arms 211 in the other of the rack clamping assemblies. The sliding tracks of the first transverse sliding block 513 and the third transverse sliding block 515 are on the same straight line, and the sliding tracks of the first transverse sliding block 513 and the fourth transverse sliding block 516 are parallel; the sliding tracks of the second cross slide 514 and the third cross slide 515 are parallel, and the sliding tracks of the second cross slide 514 and the fourth cross slide 516 are in the same straight line.

Referring to fig. 1 and 3, the longitudinal slides 52 of the four slide adjusting mechanisms 5 are respectively a first longitudinal slide 522, a second longitudinal slide 523, a third longitudinal slide 524 and a fourth longitudinal slide 525, the first longitudinal slide 522 and the second longitudinal slide 523 are respectively located on the first transverse slide 513 and the second transverse slide 514, and the third longitudinal slide 524 and the fourth longitudinal slide 525 are respectively located on the third transverse slide 515 and the fourth transverse slide 516. The sliding tracks of the first longitudinal slide block 522 and the fourth longitudinal slide block 525 are on the same straight line, and the sliding tracks of the first longitudinal slide block 522 and the third longitudinal slide block 524 are parallel. The sliding tracks of the second longitudinal sliding block 523 and the third longitudinal sliding block 524 are on the same straight line, and the sliding tracks of the second longitudinal sliding block 523 and the fourth longitudinal sliding block 525 are parallel.

Referring to fig. 3, in order to slide the lateral slides 51 of the different rack arms 211 simultaneously to adjust the size of the clamping position 4, the adjustable bracket of this embodiment further comprises a lateral linkage 6. The transverse linkage 6 is arranged on two transverse sliders 51 with sliding tracks on the same straight line, and is used for driving the two transverse sliders 51 to slide towards the direction close to each other or away from each other simultaneously. The transverse linkage 6 comprises two transverse hinge rods 61 and a first telescopic rod 62. In the same transverse linkage 6, one ends of the two transverse hinge rods 61 are hinged with each other, damping for enabling the transverse hinge rods 61 to move smoothly is arranged at the hinged position, and the other ends of the two transverse hinge rods 61 are respectively hinged with the two transverse sliding pieces 51 with sliding tracks on the same straight line. In the present embodiment, the lateral links 6 are provided in two sets. In one group of the transverse linkage members 6, two transverse hinge rods 61 are respectively hinged with a first transverse sliding block 513 and a third transverse sliding block 515, and two ends of a first telescopic rod 62 are respectively fixedly connected with the first transverse sliding block 513 and a fourth transverse sliding block 516; in another set of transverse linkage members 6, two transverse hinge rods 61 are respectively hinged with the second transverse sliding block 514 and the fourth transverse sliding block 516, and two ends of the first telescopic rod 62 are fixedly connected to the second transverse sliding block 514 and the third transverse sliding block 515. The first telescopic rods 62 of the two transverse linkage pieces 6 are parallel to the long edge of the bottom plate 1.

When one of the cross slides 51 is moved, the other three cross slides 51 are driven by the corresponding cross hinge rod 61 and the first telescopic rod 62 to slide along the corresponding sliding tracks, so that the longitudinal slide 52 and the holding portion 3 on the cross slide 51 move.

With reference to fig. 3, the carriage also comprises a longitudinal link 7 in order to allow the longitudinal slides 52 on the different rack arms 211 to slide simultaneously. The longitudinal linkage member 7 is arranged on two longitudinal slides 52 with sliding tracks on the same straight line, and is used for driving the two longitudinal slides 52 to slide towards a mutually approaching direction or a mutually departing direction simultaneously. The longitudinal linkage 7 comprises two longitudinal articulated rods 71 and a second telescopic rod 72. In the same longitudinal linkage 7, one ends of two longitudinal hinge rods 71 are hinged with each other, damping is also arranged at the hinged position, and the other ends of the two longitudinal hinge rods 71 are respectively hinged with two longitudinal sliding pieces 52 with sliding tracks on the same straight line. In the present embodiment, the longitudinal links 7 are provided in two sets. In one group of the longitudinal linkage members 7, two longitudinal hinge rods 71 are respectively hinged with the first longitudinal sliding block 522 and the fourth longitudinal sliding block 525, and two ends of the second telescopic rod 72 are respectively fixedly connected to the first longitudinal sliding block 522 and the third longitudinal sliding block 524; in the other set of longitudinal linkage members 7, the two longitudinal hinge rods 71 are respectively hinged to the second longitudinal sliding block 523 and the third longitudinal sliding block 524, and both ends of the second telescopic rod 72 are fixedly connected to the second longitudinal sliding block 523 and the fourth longitudinal sliding block 525. The first telescopic rods 62 of the two sets of longitudinal linkage members 7 are parallel to the short side of the bottom plate 1.

When the position of the lateral slide 51 is kept unchanged, one of the longitudinal slides 52 is moved, and the four longitudinal slides 52 are moved simultaneously by the longitudinal hinge rod 71 and the second telescopic rod 72, so that the catches 3 on the longitudinal slides 52 are moved simultaneously, thereby facilitating the adjustment of the size of the clamping position 4.

Referring to fig. 3, in order to allow the two lateral sliders 51 connected to the two lateral hinge rods 61 hinged to each other to slide in the direction approaching to or moving away from each other at the same time and at the same speed, the carriage further includes a lateral guide mechanism 8 for limiting the moving direction of the lateral hinge rods 61, and the lateral guide mechanism 8 includes two support rods 81 and one guide rod 82. Two bracing pieces 81 are arranged on one side of the bottom plate 1 close to the rack adjusting mechanism 2, and are symmetrically distributed on the bottom plate 1 by taking the gear knob 22 as a center and are vertical to the bottom plate 1, and the two bracing pieces 81 are respectively positioned on the edges of the bottom plate 1 close to the two short edges. Two ends of the guide rod 82 are respectively fixedly connected to one ends of the two guide rods 82 far away from the bottom plate 1. Two guide rails are arranged on the guide rod 82, each guide rail corresponds to two transverse hinge rods 61 which are hinged with each other, and the hinge points of the transverse hinge rods 61 are arranged on the guide rails in a sliding mode, so that the hinge points of the transverse hinge rods 61 slide along the direction of the guide rails. Correspondingly, the bracket also comprises a longitudinal guide mechanism 9 for limiting the moving direction of the longitudinal hinge rod 71, the longitudinal guide mechanism 9 and the transverse guide mechanism 8 are the same in structure, two support rods 81 of the longitudinal guide mechanism 9 are respectively positioned in the middle of the edges of the two long sides close to the bottom plate 1, and a guide rod 82 of the longitudinal guide mechanism 9 is perpendicular to a guide rod 82 of the transverse guide mechanism 8 in a non-coplanar manner.

Referring to fig. 1, in order to improve the supporting stability of the bracket, the bracket further includes a supporting plate 10, the supporting plate 10 is substantially rectangular and parallel to the bottom plate 1, and the supporting plate 10 and the holder 3 together form a supporting surface. When the clamping part 3 clamps the required equipment, the supporting plate 10 can support the clamped equipment, so that the supporting stability is improved.

The implementation principle of this application embodiment adjustable support does: when equipment is required to be clamped, the gear knob 22 is rotated to be far away from one end of the rack arm 211, the rack arm 211 slides along the diagonal direction of the bottom plate 1, the clamping position 4 is enlarged, the equipment is placed on the supporting plate 10, then the gear knob 22 is rotated reversely to enable the clamping position 4 to be reduced, and the four clamping parts 3 clamp the four corners of the clamped equipment respectively. When the ratio of the length and the width of the clamping position 4 cannot be adapted to the clamped device, the lateral slider 51 and the longitudinal slider 52 are slid, the holding part 3 moves along with the sliding movement of the lateral slider 51 and the longitudinal slider 52, so that the size of the clamping position 4 is adjusted to a proper position, and finally the required clamping device is placed in the clamping position 4. Through the sliding of the rack arm 211, the transverse slide piece 51 and the longitudinal slide piece 52, the size of the clamping position 4 can be adjusted more conveniently, so that the bracket can be adapted to equipment with various sizes.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. An adjustable support, comprising:

a base plate (1);

the rack adjusting mechanism (2) is movably arranged on the bottom plate (1), the adjusting gear mechanism comprises two groups of clamping rack assemblies (21) and a gear knob (22), the gear knob (22) is positioned at the center of the bottom plate (1), the two groups of clamping rack assemblies (21) are respectively arranged along the diagonal line of the bottom plate (1) in a sliding manner, each group of clamping rack assemblies (21) comprises two rack arms (211), the two rack arms (211) are arranged in a central symmetry manner by taking the gear knob (22) as the center, the rack arms (211) are meshed with the gear knob (22), the rack arms (211) are arranged on the bottom plate (1) in a sliding manner, each rack arm (211) is correspondingly provided with a clamping part (3), and each clamping part (3) is positioned at one end, far away from the gear knob (22), of the corresponding rack arm (211), the four clamping parts (3) are distributed in a rectangular array, and clamping positions (4) are formed among the four clamping parts (3).

2. An adjustable support according to claim 1, wherein each rack arm (211) is provided with a corresponding sliding adjustment mechanism (5) for driving two adjacent catches (3) to move towards or away from each other, and the catches (3) are provided with the sliding adjustment mechanisms (5) on the corresponding rack arms (211).

3. An adjustable support according to claim 2, wherein said sliding adjustment mechanism (5) comprises lateral slides (51) and longitudinal slides (52), said catch (3) being provided to the respective longitudinal slide (52), said longitudinal slides (52) being slidably provided to said lateral slides (51), said lateral slides (51) being slidably provided to the end of the respective rack arm (211) remote from said gear knob (22), the sliding direction of said lateral slides (51) being perpendicular to the sliding direction of said longitudinal slides (52), each of said lateral slides (51) being collinear with the sliding trajectory of one of the adjacent lateral slides (51) and parallel with the sliding trajectory of the other adjacent lateral slide (51), each of said longitudinal slides (52) being collinear with the sliding trajectory of one of the adjacent longitudinal slides (52), the sliding tracks of the longitudinal slide pieces (52) adjacent to one another are parallel.

4. An adjustable support according to claim 3, wherein the two cross slides (51) having the same sliding paths are provided with the cross linkage (6) for driving the two cross slides (51) to slide toward or away from each other simultaneously.

5. An adjustable support according to claim 4, wherein the transverse linkage member (6) comprises two transverse hinge rods (61), one ends of the two transverse hinge rods (61) are hinged with each other, the other ends of the two transverse hinge rods (61) are respectively hinged with two transverse sliders (51) with sliding tracks on the same straight line, the two transverse sliders (51) with sliding tracks parallel to each other are also provided with first telescopic rods (62), and two ends of each first telescopic rod (62) are respectively connected with the two transverse sliders (51).

6. An adjustable support according to claim 4, wherein the longitudinal sliding members (52) with the same sliding track are provided with longitudinal linkage members (7) for driving the longitudinal sliding members (52) to slide towards or away from each other simultaneously.

7. An adjustable support according to claim 6, wherein the longitudinal linkage member (7) comprises two longitudinal hinged rods (71), one end of each of the two longitudinal hinged rods (71) is hinged with each other, the other end of each of the two longitudinal sliding blocks is hinged with each of the two longitudinal sliding pieces (52) with sliding tracks on the same straight line, a second telescopic rod (72) is further arranged on each of the two longitudinal sliding pieces (52) with sliding tracks parallel to each other and adjacent to each other, and both ends of the second telescopic rod (72) are respectively connected with the two longitudinal sliding pieces (52).

8. The adjustable bracket according to claim 1, wherein each rack arm (211) is provided with a guide hole (2111) for limiting the sliding direction of the rack arm (211), the base plate (1) is provided with guide posts (11) for sliding fit with the guide holes (2111), the guide posts (11) are in one-to-one correspondence with the guide holes (2111), and the guide posts (11) are sleeved in the corresponding guide holes (2111).

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