Length adjustment, corner tee and adjustable size support

Abstract

The utility model belongs to the field of daily necessities, specifically relates to a length adjusting spare, corner tee and size adjustable support. Including corner tee, length adjusting spare, connecting rod and fixed spare. Among them, corner tee and length adjusting spare realize stable connection through the three -fold structure of connecting protrusion, spacing recess joint, bolt fixing, vertical positioning of positioning seat, the telescopic range of fixed spare's spacing gap is limited, and the connecting rod is avoided to separate, and its cross -section shape is adapted to round pipe, flat pipe or square pipe, and the universality is promoted. The utility model has the stability of connecting and the convenience of adjusting, is applicable to the scene that adjustable support, mosquito net, tent need frequent length adjustment.

Description

Technical Field

[0001] This utility model belongs to the field of daily necessities, specifically relating to a length adjustment component, a corner tee, and a size-adjustable bracket. Background Technology

[0002] In the field of mosquito net frame technology, the mosquito net frame, as the basic structure supporting the mosquito net and isolating mosquitoes, directly affects the ease of installation and the breadth of its application scenarios due to its size adaptability. Currently, most mosquito net frames on the market adopt a fixed-size frame structure, usually composed of horizontal bars, vertical bars, and corner T-joints. The various bars are fixedly connected by bolts or snap-fit ​​methods, and the overall dimensions (such as length, width, and height) are determined at the factory.

[0003] However, existing mosquito net frames have significant technical problems in practical use: due to their fixed size, they are difficult to adapt to different bed sizes (such as single beds, double beds, and extended beds) or special spaces (such as bunk beds or installation areas around irregularly shaped beds). When users need to use fixed-size frames for non-standard bed types, problems often arise such as the frame being too long, causing it to collide with walls or furniture, or too short, failing to completely cover the edges of the bed, seriously affecting the mosquito net's concealing effect. If the length of the poles is forcibly adjusted, additional poles need to be cut or fitted with tools, which is cumbersome and can easily damage the structural strength of the frame, or even require replacing the entire frame, greatly reducing the flexibility of use and increasing the cost of use.

[0004] Chinese Patent CN202775299U discloses a mosquito net support rod with telescopic length function, belonging to the field of mosquito net support technology. It solves the problems of poor fastening quality in existing mosquito net support rods, which affect product stability and service life. This mosquito net support rod includes a sleeve and an adjusting rod disposed within the sleeve. One end of the adjusting rod extending into the sleeve is equipped with a fastening head, and a fastening plug is provided between the adjusting rod and the sleeve. The fastening head includes a rotating shaft fixedly connected to the adjusting rod, with limiting plates at both ends. A fastening plate is provided on the rotating shaft located between the two limiting plates. The rotating shaft has a protruding edge that can press the fastening plate to fasten it to the inner wall of the sleeve when the rotating shaft rotates clockwise. This utility model is applicable to a wide range of mosquito net supports, with a simple structure, reasonable design, convenient operation, and stable quality. When adjusting the above device, the two actions of "stretching / contraction adjustment rod" and "rotating shaft fastening" must be completed simultaneously. The rotation angle must be repeatedly adjusted to ensure that the fastening plate is tightly attached to the inner wall of the sleeve. The length is passively fixed by friction, and there is no clear limit hole or positioning seat to provide a fixed position. Utility Model Content

[0005] This invention addresses the aforementioned technical problems, improves the efficiency of length adjustment for mosquito net supports, and enhances the overall strength of the crossbars and vertical bars of the support.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A length adjusting component, installed on the three connecting legs of a corner tee of a bracket, is used to adjust the length of a connecting rod, and includes a sleeve, a connecting protrusion, a positioning hole, and a limiting hole;

[0008] The sleeve has a connecting protrusion and a positioning hole on its side wall, and at least two limiting holes on its top.

[0009] The connecting protrusion engages with the side wall of the corner tee and passes through the corner tee and the positioning hole via a connector.

[0010] By adopting the above technical solution, the length adjusting component is engaged with the side wall of the corner tee via a connecting protrusion on the sleeve sidewall, and fixed to the positioning hole via a connector passing through the corner tee, forming a stable assembly relationship. At least two limiting holes on the top provide a clear positioning reference for the connecting rod length adjustment. Users can select different limiting holes as adjustment levels according to their needs, avoiding the uncertainty of "length estimation based on experience" in traditional adjustment methods. Simultaneously, the double fixing structure of the connecting protrusion and the positioning hole ensures a tight fit between the length adjusting component and the corner tee, effectively preventing sleeve displacement or loosening during adjustment, structurally improving the reliability and efficiency of length adjustment.

[0011] Furthermore, the sleeve has a cross-sectional shape that is circular, oval, elliptical, or square along the vertical direction.

[0012] By adopting the above technical solution, the sleeve's cross-section along the vertical direction is designed to be circular, oval, elliptical, or square, enabling shape adaptation to connecting rods of different shapes (such as round tubes, flat tubes, and square tubes). This diverse range of cross-section options allows the length adjustment component to flexibly match mainstream connecting rod types on the market, avoiding limitations caused by incompatibility between the sleeve and connecting rod shapes, significantly expanding the applicable scenarios of the length adjustment component, and improving the product's versatility.

[0013] Furthermore, the sleeve includes a connecting portion and a telescopic portion;

[0014] The connecting part and the telescopic part are integrally formed. The length of the telescopic part is 5cm-20cm. The length of the connecting part is adapted to the connecting leg of the corner tee.

[0015] By adopting the above technical solution, the connecting part and the telescopic part of the sleeve are integrally molded. The length of the connecting part is adapted to the connecting leg of the corner tee, ensuring a seamless fit during assembly and avoiding loosening due to dimensional deviations. The 5cm-20cm length design of the telescopic part covers the adjustment needs of common bed sizes (such as the width difference between single and double beds), providing ample adjustment range for the support. The integrally molded structure eliminates stress concentration points that may occur when splicing multiple parts, enhances the overall structural strength of the sleeve, and reduces the risk of breakage or deformation during long-term use.

[0016] This utility model further discloses a corner tee for connecting length adjustment components, including connecting legs, connecting holes, positioning seats and reinforcing ribs;

[0017] The side wall of the connecting leg is provided with two connecting holes, which are respectively connected to the connecting protrusion and the limiting hole. The limiting hole is aligned with the connecting hole and connected together by the connecting member. The connecting member includes a pin, bolt or rivet.

[0018] The bottom of the connecting leg is provided with the positioning seat, and the size of the positioning seat is adapted to the connecting part of the sleeve;

[0019] The reinforcing rib, which is an arc-shaped plate, is provided between the two horizontally arranged connecting legs.

[0020] By adopting the above technical solution, the connecting legs of the corner tee are aligned with the connecting protrusion and limiting hole of the length adjustment component through two connecting holes on the side wall, and are fixed by connecting parts such as pins, bolts or rivets to form a stable connection with dual-point positioning; the positioning seat at the bottom of the connecting leg is adapted to the size of the sleeve connection part, further limiting the installation position of the sleeve and avoiding sleeve offset during adjustment; the arc-shaped reinforcing rib between the horizontal connecting legs increases the structural rigidity in the horizontal direction, reduces corner deformation caused by the support load or external force collision, and improves the overall strength of the connection between the horizontal and vertical bars of the support.

[0021] Furthermore, a limiting groove is provided on the inner wall of the connecting leg located in the connecting hole of the connecting protrusion, and the connecting protrusion is engaged in the limiting groove.

[0022] By adopting the above technical solution, the connecting protrusion engages with the limiting groove on the inner wall of the connecting leg, forming a physical limit through the engaging structure, further enhancing the connection stability between the length adjustment component and the corner tee. This design avoids the problems that may occur when relying solely on the connecting component for fixation, and especially in scenarios with frequent adjustments or long-term use, it can effectively maintain the relative position of the adjustment component and the corner tee, ensuring the accuracy of length adjustment.

[0023] This utility model further discloses a size-adjustable bracket, which uses a corner tee to adjust the size of the bracket, including a connecting rod and a fixing component;

[0024] At least two connecting rods are spliced ​​together to form a horizontal or vertical rod of the bracket. Adjacent connecting rods are connected together by fasteners. Adjustment buttons are provided at both ends of the horizontal and vertical rods, and the adjustment buttons are engaged in the limiting holes.

[0025] By adopting the above technical solution, the horizontal or vertical bars of the bracket are assembled from at least two connecting rods via fasteners, and the adjustment buttons at both ends of the horizontal and vertical bars are engaged in limiting holes. This design allows the bracket to flexibly adjust its length, height, or width by increasing or decreasing the number of connecting rods or adjusting the engagement position of the adjustment buttons. Simultaneously, the direct engagement of the adjustment buttons with the limiting holes replaces the cumbersome operation of traditional bolt tightening; users only need to press the button to complete the positioning, significantly improving the efficiency of bracket size adjustment.

[0026] Furthermore, the connecting rods are fitted together with each other by the fasteners, and the connecting rods are round tubes, flat tubes, or square tubes.

[0027] By adopting the above technical solution, the connecting rods are assembled together by fasteners, and the connecting rods can be round, flat, or square tubes. This design gives the connecting rods flexibility in telescopic adjustment. The choice of round, flat, or square tubes can adapt to different installation scenarios. For example, round tubes are easier to rotate and adjust, while square tubes provide more stable load-bearing capacity. The assembled structure of the fasteners ensures a tight connection between adjacent connecting rods, preventing the connecting rods from falling off or shaking during telescopic movement, and improving the overall structural stability of the bracket.

[0028] Furthermore, the fastener includes a first snap-fit ​​sleeve and a second snap-fit ​​sleeve;

[0029] The first snap-fit ​​sleeve is fixed inside the second snap-fit ​​sleeve, and a limiting gap is formed between the first snap-fit ​​sleeve and the second snap-fit ​​sleeve. The first snap-fit ​​sleeve is fitted into one of the connecting rods and is located in the limiting gap. The second snap-fit ​​sleeve is fitted inside the adjacent connecting rod.

[0030] By adopting the above technical solution, the fastener consists of a first snap-fit ​​sleeve and a second snap-fit ​​sleeve. The first snap-fit ​​sleeve is fixed inside the second snap-fit ​​sleeve and forms a limiting gap, and both are fitted into adjacent connecting rods. The limiting gap design limits the maximum extension range of the connecting rods, preventing them from detaching due to excessive stretching. At the same time, the nested structure of the first and second snap-fit ​​sleeves increases the contact area between the connecting rods, strengthens the connection strength, and makes the connecting rod joints less prone to loosening or breakage when the bracket is subjected to the weight of the mosquito net or external impact, further improving the overall durability of the bracket.

[0031] Furthermore, by pressing the adjustment button, the position of the horizontal bar or the vertical bar in the limiting hole can be adjusted so that the bracket can be adjusted in length, height or width by 5cm-20cm.

[0032] By adopting the above technical solution, the position of the horizontal or vertical bar in the limiting hole can be adjusted by pressing the adjustment button, achieving a size adjustment of 5cm-20cm. This adjustment method replaces the traditional complicated operation. Users do not need to use extra tools such as wrenches; they can complete the length positioning simply by pressing the button with one hand, making the operation much simpler. At the same time, the preset positions of the limiting holes (such as 5cm, 10cm, and 15cm) provide users with clear adjustment references, avoiding the inefficient process of repeated measurement and calibration, and significantly improving the length adjustment efficiency of the mosquito net frame.

[0033] This utility model has the following beneficial effects:

[0034] 1. This utility model uses a length adjustment component with a connecting protrusion that engages with the side wall of a corner tee, and a connector that passes through the corner tee and is fixed to the positioning hole. At the same time, at least two limiting holes are opened on the top of the sleeve to form a stable assembly relationship and clear adjustment levels, avoiding the uncertainty in traditional adjustment methods and improving the reliability and efficiency of length adjustment.

[0035] 2. This utility model features an integrated design of the connecting part and the telescopic part of the sleeve, with the length of the connecting part matching the connecting leg of the corner tee. This ensures a seamless fit between the sleeve and the corner tee during assembly, and eliminates stress concentration points at the splicing of multiple parts through the integrated molding structure. This enhances the overall structural strength of the sleeve and reduces the risk of breakage or deformation during long-term use.

[0036] 3. This utility model aligns and fixes the connecting hole of the corner tee with the connecting protrusion and limiting hole of the length adjustment component, and adapts to the positioning seat at the bottom of the connecting leg and the sleeve connection part, as well as the arc-shaped reinforcing rib between the horizontal connecting legs, to form a composite assembly relationship with dual-point positioning. This effectively avoids sleeve offset during adjustment, reduces the risk of corner deformation, and improves the overall strength of the connection between the horizontal and vertical bars of the bracket.

[0037] 4. This utility model uses a locking sleeve 1 and a locking sleeve 2 of the fixing component to nest and form a limiting gap, which are respectively fitted into adjacent connecting rods. The limiting gap limits the maximum extension range of the connecting rods and prevents excessive stretching and separation. The nesting structure also increases the contact area between the connecting rods and strengthens the connection strength. This makes the connecting rod joints less prone to loosening or breaking when the bracket is under load or subjected to external force, thus improving the overall durability. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the length adjusting component of this utility model;

[0039] Figure 2 This is a schematic diagram of the corner tee of this utility model;

[0040] Figure 3 This is an assembly diagram of the corner tee and length adjustment component of this utility model;

[0041] Figure 4 This is a structural schematic diagram of the fastener of this utility model;

[0042] Figure 5 This is a cross-sectional view of the fastener of this utility model;

[0043] Figure 6 This is a schematic diagram of the overall structure of the bracket of this utility model;

[0044] Figure 7 This utility model Figure 6 Enlarged schematic diagram of part A in the middle.

[0045] Among them, 10-length adjustment part; 11-sleeve; 111-connecting part; 112-telescopic part; 12-connecting protrusion; 13-positioning hole; 14-limiting hole;

[0046] 20-Corner tee; 21-Connecting leg; 211-Limiting groove; 22-Connecting hole; 23-Positioning seat; 24-Reinforcing rib; 25-Connector;

[0047] 30-Bracket; 31-Connecting rod; 32-Fixed component; 321-Snap-fit ​​sleeve one; 322-Snap-fit ​​sleeve two; 323-Limiting gap; 33-Horizontal bar; 34-Vertical bar; 35-Adjusting button. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0049] In the description of this utility model, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this utility model. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the protection scope of this utility model.

[0050] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5, Figure 6 and Figure 7 As shown, a length adjusting component, a corner tee, and a size-adjustable bracket are disclosed. The length adjusting component 10 has a connecting protrusion 12 on the side wall of its sleeve 11 that directly engages with a limiting groove 211 on the inner wall of the connecting leg 21 of the corner tee 20, forming a physical limit to prevent the sleeve 11 from shifting horizontally during adjustment. Two connecting holes 22 on the side wall of the connecting leg 21 of the corner tee 20 are aligned with the connecting protrusion 12 and the positioning hole 13 of the sleeve 11, respectively. Connectors 25, such as pins, bolts, or rivets, pass through the connecting holes 22 and the positioning holes 13 to further secure the sleeve 11 and the corner tee 20, forming a snap-fit ​​connection. The sleeve 11 has a double constraint structure. The connecting part 111 of the sleeve 11 is directly inserted into the positioning seat 23 at the bottom of the connecting leg 21 of the corner tee 20. The size of the positioning seat 23 is perfectly matched with the connecting part 111, which limits the installation position of the sleeve 11 in the vertical direction and prevents the sleeve 11 from sliding down due to gravity or external force. The connecting part 111 and the telescopic part 112 of the sleeve 11 of the length adjustment component are integrally molded and there is no splicing gap between them, which ensures the overall structural strength of the sleeve 11. The connecting part 111 is responsible for connecting with the positioning seat 23 of the corner tee 20, while the telescopic part 112 is used to accommodate and adjust the length of the connecting rod 31. At least two limiting holes 14 on the top of the sleeve 11 are aligned with the connecting holes 22 of the connecting legs 21 of the corner tee 20, providing a snap-fit ​​position for the adjustment button 35 of the subsequent bracket 30. The three connecting legs 21 of the corner tee 20 correspond to the connection requirements of the horizontal bar 33, vertical bar 34 and the connecting rod 31 in another direction of the bracket 30, respectively. Each connecting leg 21 is connected to the length adjustment component 10 through the connecting hole 22 and the positioning seat 23. The two horizontally set connecting legs 21 are connected by an arc-shaped reinforcing rib 24. The arc structure disperses the lateral stress generated when the horizontal bar 33 bears the load, preventing the corner tee 20 from deforming due to uneven stress. Two connecting rods 31 are connected by a fastener 32. The first snap-fit ​​sleeve 321 of the fastener 32 is fitted inside one of the connecting rods 31 and is located in the limiting gap 323 between the second snap-fit ​​sleeve 322 and the first snap-fit ​​sleeve 321. The second snap-fit ​​sleeve 322 is fitted inside the adjacent connecting rod 31. The nested structure prevents the connecting rods 31 from detaching. Adjustment buttons 35 are provided at both ends of the horizontal rod 33 and the vertical rod 34. The buttons are directly snapped into the limiting holes 14 at the top of the sleeve 11 of the length adjustment component 10. Pressing the adjustment button 35 can switch its snap-fit ​​position in different limiting holes 14, thereby adjusting the length of the horizontal rod 33 or the vertical rod 34.

[0051] In one embodiment, refer to Figure 2 and Figure 3As can be seen, firstly, the connecting protrusion 12 on the side wall of the sleeve 11 of the length adjustment component is directly engaged in the limiting groove 211 on the inner wall of the corner tee connecting leg 21, forming a physical limit in the horizontal direction to prevent the sleeve from shifting or rotating laterally; at the same time, the two connecting holes 22 on the side wall of the corner tee connecting leg 21 are aligned with the connecting protrusion 12 and the positioning hole 13 of the sleeve 11, respectively, and are fixed to the positioning hole 13 by connecting parts 25 such as pins, bolts or rivets passing through the connecting holes 22, forming a double constraint to strengthen the connection stability; in addition, the connecting part 111 of the sleeve 11 is inserted into the positioning seat 23 at the bottom of the corner tee connecting leg 21, and the positioning seat 23 is perfectly matched with the size of the connecting part 111, limiting the installation position of the sleeve 11 in the vertical direction and preventing it from sliding off due to gravity or external force. The assembly of the two parts must be completed in sequence: First, align the connecting part 111 of the sleeve 11 with the positioning seat 23 and insert it to complete the initial vertical positioning; then adjust the sleeve angle so that the connecting protrusion 12 is engaged in the limiting groove 211 to form a horizontal limit; finally, tighten the connector 25 through the connecting hole 22 and the positioning hole 13 to ensure no relative displacement. The user presses the adjustment buttons 35 at both ends of the horizontal bar 33 or the vertical bar 34 to disengage it from the currently engaged limiting hole 14, releasing the fixed constraint on the connecting rod 31; at this time, the connecting rod 31, which is connected by the engaging sleeve 1 321 and engaging sleeve 2 322 of the fastener 32, can be stretched or contracted along the telescopic part 112 of the sleeve 11 to the target length of 80cm, 90cm or 100cm; after adjustment, release the adjustment button 35 to re-engage it into the limiting hole 14 at the target position, and use the multiple preset positions of the limiting hole 14 to directly lock the current position of the connecting rod 31 to complete the length adjustment.

[0052] In one embodiment, refer to Figure 4 , Figure 5 , Figure 6 and Figure 7 As can be seen, the fastener 32, as the core component connecting adjacent connecting rods 31, consists of three parts: a first snap-fit ​​sleeve 321, a second snap-fit ​​sleeve 322, and a limiting gap 323. The first snap-fit ​​sleeve 321 is the inner sleeve, with an outer diameter slightly smaller than the inner diameter of the connecting rod 31, suitable for round, flat, or square tubes, and is directly fitted inside one of the connecting rods. The second snap-fit ​​sleeve 322 is the outer sleeve, with an inner diameter slightly larger than the outer diameter of the first snap-fit ​​sleeve 321 and a outer diameter slightly smaller than the inner diameter of the adjacent connecting rod 31, and is fitted inside the other connecting rod 31. The first snap-fit ​​sleeve 321 is fixed to the center of the second snap-fit ​​sleeve 322 by welding, riveting, or integral molding. The limiting gap 323 is formed by the annulus between the two.

[0053] First, insert the first snap-fit ​​sleeve 321 completely into the connecting rod. The tight fit or interference fit between its outer diameter and the inner diameter of the connecting rod 31 creates initial fixation, preventing relative sliding. Then, insert the second snap-fit ​​sleeve 322 into the connecting rod B, again achieving fixation through the fit between its outer diameter and the inner diameter of the connecting rod B. At this point, the first snap-fit ​​sleeve 321 is located within the limiting gap 323 of the second snap-fit ​​sleeve 322. When adjusting the length of the connecting rod 31, it can slide axially along the first snap-fit ​​sleeve 321, but the sliding range is strictly limited by the boundary of the limiting gap 323 to prevent detachment. Simultaneously, the nested structure, through the double-sided contact between the connecting rod 31 and the first snap-fit ​​sleeve, and the other connecting rod 31 and the second snap-fit ​​sleeve 322, significantly increases the contact area. Combined with the rigid material of the fasteners themselves, this effectively improves the shear and torsional resistance of the joint, ensuring that the connection point is not easily loosened when the bracket is under load or subjected to external forces. If the connecting rod 31 is a round tube, the cross-section of the clamping sleeve 321 or clamping sleeve 322 is round to ensure a gapless fit; if it is a square tube, the cross-section of the sleeve is adjusted to square to prevent the connecting rod 31 from rotating within the fixing part 32 and to enhance stability.

[0054] Working principle: The bracket 30 uses the corner tee 20 as the connecting node, and forms a basic frame through the multi-layer structure of the length adjusting component 10: the sleeve 11 of the length adjusting component is inserted into the positioning seat 23 at the bottom of the corner tee connecting leg 21 through the connecting part 111, completing the initial vertical positioning; the connecting protrusion 12 on the side wall of the sleeve 11 is inserted into the limiting groove 211 on the inner wall of the corner tee, forming a physical limit in the horizontal direction; finally, the connecting parts 25, such as bolts, pass through the connecting hole 22 of the corner tee and are fixed to the positioning hole 13 of the sleeve, ensuring the stable connection between the corner tee and the length adjusting component, and providing reliable node support for the whole device;

[0055] Adjacent connecting rods 31 are fixed together with the fixing member 32 and the adjusting button 35. The first locking sleeve 321 and the second locking sleeve 322 of the fixing member 32 are respectively nested inside the adjacent connecting rods 31. When the length needs to be adjusted, press the adjusting button 35 to make it disengage from the limiting hole 14 at the top of the sleeve 11, thereby releasing the locking of the connecting rod 31. At this time, connecting rod A can slide along the axial direction of the first locking sleeve 321, but it is limited by the boundary of the limiting gap 323 of the fixing member. The two connecting rods 31 are locked together by the fixing member to prevent the connecting rods 31 from disengaging. After the adjustment is in place, release the adjusting button 35 to make it re-lock into the target limiting hole 14, lock the current length, and complete the quick adjustment.

[0056] The corner tee 20 is connected to the length adjusting component 10; the length of the connecting rod 31 is adjusted by adjusting the horizontal bar 33 or the vertical bar 34 at the position of the limiting hole 14.

[0057] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A length adjusting member, which is installed on three connecting legs (21) of a corner tee (20) of a bracket (30) and is used to adjust the length of a connecting rod (31), characterized in that: It includes a sleeve (11), a connecting protrusion (12), a positioning hole (13), and a limiting hole (14); The sleeve (11) has a connecting protrusion (12) and a positioning hole (13) on its side wall, and at least two limiting holes (14) are provided on the top of the sleeve (11). The connecting protrusion (12) engages with the side wall of the corner tee (20) and passes through the corner tee (20) and the positioning hole (13) via the connector (25).

2. The length adjustment member of claim 1, wherein: The sleeve (11) has a circular, oval, elliptical, or square cross-sectional shape along the vertical direction.

3. The length adjustment member of claim 2, wherein: The sleeve (11) includes a connecting part (111) and a telescopic part (112); The connecting part (111) and the telescopic part (112) are integrally formed. The length of the telescopic part (112) is 5cm-20cm. The length of the connecting part (111) is adapted to the connecting leg (21) of the corner tee (20).

4. A corner tee, characterized in that: For connecting the length adjusting member according to any one of claims 1-3, it includes a connecting leg (21), a connecting hole (22), a positioning seat (23), and a reinforcing rib (24); The side wall of the connecting leg (21) is provided with two connecting holes (22), which are respectively connected to the connecting protrusion (12) and the limiting hole (14). The limiting hole (14) is aligned with the connecting hole (22) and connected together through the connector (25). The connector (25) includes a pin, bolt or rivet. The bottom of the connecting leg (21) is provided with the positioning seat (23), and the size of the positioning seat (23) is adapted to the connecting part (111) of the sleeve (11); The reinforcing rib (24) is provided between the two horizontally arranged connecting legs (21), and the reinforcing rib (24) is an arc-shaped plate.

5. The corner tee according to claim 4, characterized in that: A limiting groove (211) is provided on the inner wall of the connecting leg (21) of the connecting hole (22) of the connecting protrusion (12), and the connecting protrusion (12) is engaged in the limiting groove (211).

6. A size-adjustable bracket, characterized in that: The dimensions of the corner tee (20) adjustment bracket (30) according to claim 4 are used, including a connecting rod (31) and a fixing member (32); At least two connecting rods (31) are spliced ​​together to form a horizontal bar (33) or a vertical bar (34) of a bracket (30). Adjacent connecting rods (31) are connected together by fasteners (32). Adjustment buttons (35) are provided at both ends of the horizontal bar (33) and the vertical bar (34). The adjustment buttons (35) are engaged in the limiting holes (14).

7. The size-adjustable bracket according to claim 6, characterized in that: The connecting rods (31) are fitted together with each other by the fastener (32), and the connecting rods (31) are round tubes, flat tubes or square tubes.

8. The size-adjustable bracket according to claim 7, characterized in that: The fastener (32) includes a first snap-fit ​​sleeve (321) and a second snap-fit ​​sleeve (322); The first snap-fit ​​sleeve (321) is fixed inside the second snap-fit ​​sleeve (322), and a limiting gap (323) is formed between the first snap-fit ​​sleeve (321) and the second snap-fit ​​sleeve (322). The first snap-fit ​​sleeve (321) is fitted into one of the connecting rods (31) and is located in the limiting gap (323). The second snap-fit ​​sleeve (322) is fitted into the adjacent connecting rod (31).

9. The size-adjustable bracket according to claim 6, characterized in that: Press the adjustment button (35) to adjust the position of the horizontal bar (33) or the vertical bar (34) in the limiting hole (14), so that the bracket (30) can be adjusted in length, height or width by 5cm-20cm.

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