Structure of adjustable handle of bowl basket

Abstract

The invention provides a structure of an adjustable handle of a bowl basket. The structure of the adjustable handle of the bowl basket comprises the bowl basket, and guide steel wires are arranged on the two sides of the bowl basket; the lifting roller assembly can move up and down relative to the guide steel wire; the locking mechanisms are installed on the two sides of the bowl basket, and the locking mechanisms are used for locking and unlocking the lifting roller assemblies; the locking mechanism comprises an adjusting handle capable of being pressed and a locking block. At least part of the locking block is matched with the lifting roller assembly and at least part of the locking block is matched with the adjusting handle to realize up-down adjustment of the bowl basket; the locking block has elasticity, and the locking block locks the lifting roller assembly through pressing of the adjusting handle. According to the structure of the adjustable handle of the bowl basket, a user can control the state of the locking block by operating the adjusting handle, in the process, the adjusting handle does not need to be matched with the lifting roller assembly, the bowl basket can be adjusted by matching the locking block with the adjusting handle and the lifting roller assembly, and the stability of the bowl basket and the operation convenience are improved.

Description

Technical Field

[0001] The present application relates to the technical field of dishwashers, and in particular to a structure of an adjustable handle for a bowl basket. Background Art

[0002] A dish basket is provided in the washing chamber of the dishwasher, and the dish basket is used to effectively contain and fix various tableware during the washing process.

[0003] The publication number is CN205126160U, which discloses an adjustable bowl basket and a dishwasher, and particularly relates to an adjustable bowl basket and a dishwasher having the adjustable bowl basket, comprising a bowl basket body made of steel wire, a mounting plate fixed to both sides of the bowl basket body, and an adjustment mechanism mounted on the mounting plate and moving up and down relative to the mounting plate, the bowl basket body comprising a guide steel wire matched with the mounting plate and coated with a protective coating; the mounting plate comprises a main body for mounting the adjustment mechanism and a protective cover located at one side of the main body and sleeved on the protective coating of the guide steel wire; the adjustment mechanism comprises a lifting roller assembly provided on the mounting plate and having a roller, and an adjustment handle matched with the lifting roller assembly to achieve position adjustment, the lifting roller assembly is provided with a sliding cover sleeve sleeved on the protective cover and driving the roller to move up and down relative to the protective cover.

[0004] The bowl basket in the prior art is an adjustable bowl basket. When the adjusting handle is adjusted upward, the adjusting handle needs to be rotated by pressing the adjusting handle, and the adjusting handle and the lifting roller assembly need to cooperate with each other. The adjusting handle has a small limit on the lifting roller assembly and has only one fulcrum, which causes the lifting roller assembly to be unable to be accurately locked in the required position, and easily causes the lifting roller assembly to shake during the up and down movement, resulting in poor stability of the bowl basket and reduced user experience.

[0005] Therefore, the structure of the bowl basket in the prior art has room for further improvement. Summary of the invention

[0006] The purpose of the present application is to provide a structure of an adjustable handle for a bowl basket, so as to solve the problem in the background art that the adjustment handle has a small limit on the lifting roller assembly, the lifting roller assembly cannot be accurately locked in the required position, and the stability of the bowl basket is poor.

[0007] To achieve the above objectives, the present application provides a structure of an adjustable handle for a bowl basket, comprising:

[0008] A bowl basket, wherein guide steel wires are provided on both sides of the bowl basket;

[0009] A lifting roller assembly, wherein the lifting roller assembly can move up and down relative to the guide wire;

[0010] A locking mechanism, the locking mechanism being installed on both sides of the bowl basket, and the locking mechanism being used to lock and unlock the lifting roller assembly;

[0011] Wherein, the locking mechanism comprises a pressable adjustment handle and a locking block; the locking block at least partially cooperates with the lifting roller assembly and at least partially cooperates with the adjustment handle to achieve the up and down adjustment of the bowl basket;

[0012] The locking block is elastic, and the locking block locks the lifting roller assembly by pressing the adjusting handle.

[0013] Compared with the prior art, the structure of the adjustable handle of the bowl basket of the present application is provided with a locking block and a pressable adjusting handle. When the user holds the adjusting handle and pushes it upward, the lifting roller assembly will slide from the locking block along the guide wire to the end of the slider and abut against the end of the slider. The lifting roller assembly can be accurately locked in the required position to achieve up and down adjustment of the bowl basket. The locking block is elastic. The locking block locks the lifting roller assembly by pressing the adjusting handle. By operating the adjusting handle, the user can control the state of the locking block. In this process, the adjusting handle and the lifting roller assembly do not need to cooperate. The bowl basket can be adjusted by the cooperation between the locking block and the two, thereby improving the stability of the bowl basket and the convenience of operation.

[0014] Preferably, the locking block comprises an elastic portion and a limiting portion, the elastic portion is connected to the limiting portion, and the elastic portion is used to lock and unlock the lifting roller assembly;

[0015] The limiting portion is located at an end of the elastic portion away from the lifting roller assembly, and the limiting portion is used to limit the lifting roller assembly.

[0016] In this embodiment, the elastic portion is used to lock and unlock the lifting roller assembly, and the limiting portion is located at the end of the elastic portion away from the lifting roller assembly. The limiting portion is used to limit the position of the lifting roller assembly to prevent it from excessive movement.

[0017] Preferably, the elastic portion is arranged obliquely, the elastic portion is inclined toward the limiting portion, and the highest point of the elastic portion is flush with the highest point of the limiting portion.

[0018] In this embodiment, the highest point of the elastic portion is flush with the highest point of the limiting portion, which can effectively prevent the lifting roller assembly from falling out or accidentally sliding when in a free moving state.

[0019] Preferably, the locking mechanism further comprises a slider, the slider is arranged between the locking block and the lifting roller assembly, and the lifting roller assembly can slide up and down relative to the slider;

[0020] Wherein, the sliding block is provided with a groove, and the guide wire is at least partially installed in the groove.

[0021] In this embodiment, the guide wire is at least partially installed in the groove, which can effectively prevent it from accidentally falling off during use, thereby ensuring the safety of the bowl basket when adjusting the height.

[0022] Preferably, the lifting roller assembly comprises a mounting plate and a support plate, the mounting plate is fixedly connected to the support plate, the support plate is located between the mounting plate and the adjustment handle, and the support plate is an L-shaped structure;

[0023] The lifting roller assembly has an ascending state and a descending state. When the lifting roller assembly is in the descending state, the support plate is located at an end of the elastic portion away from the limiting portion.

[0024] In this embodiment, the elastic portion limits the support plate to prevent the lifting roller assembly from accidentally sliding or rebounding when in a descending state, thereby ensuring the stability of the lifting roller assembly during use.

[0025] Preferably, the end of the adjustment handle is set as a first inclined surface, and the first inclined surface is located at one end of the adjustment handle close to the limiting portion;

[0026] Wherein, when the lifting roller assembly is in a descending state, the first inclined surface is close to the limiting portion.

[0027] In this embodiment, when the lifting roller assembly is in the descending state, the first inclined surface is close to the limiting portion, which can effectively limit the movement of the lifting roller assembly and maintain stability in the descending state.

[0028] Preferably, the locking mechanism further comprises a housing and an elastic member, wherein the elastic member is installed in the housing and connected to the adjustment handle;

[0029] Wherein, the shell is provided with an opening, the adjustment handle is at least partially located at the opening, and the shell is an L-shaped structure.

[0030] In this embodiment, the elastic member can provide a buffering effect. The buffering effect of the elastic member can reduce the direct impact between the lifting roller assembly and other components, reduce wear, and extend the service life of the entire locking mechanism.

[0031] Preferably, the adjustment handle is provided with a support, the elastic member is sleeved on the support, the support protrudes in a direction away from the opening, and the support is used to support the elastic member;

[0032] Wherein, the support column is a cross-shaped structure.

[0033] In this embodiment, the pillar is mainly used to support the elastic member to ensure that the elastic member maintains a stable and effective working state during use. Through the support of the pillar, the elastic member can provide a uniform reaction force when pressed.

[0034] Preferably, a limiting protrusion is provided on the adjusting handle, and the limiting protrusion protrudes toward the bowl basket;

[0035] An inclined surface is provided at the end of the elastic portion. When the lifting roller assembly is in a descending state, the limiting protrusion abuts against the inclined surface. The limiting protrusion is a triangular structure.

[0036] In this embodiment, the limiting protrusion is a triangular structure, which can provide a stable support point, so that the limiting protrusion is more stable when pressed on the slider.

[0037] Preferably, the housing comprises an upper cover plate and a lower cover plate, and the upper cover plate is connected to the lower cover plate;

[0038] Wherein, at least three support columns are arranged on the lower cover plate, and matching pieces are arranged on the upper cover plate, and the matching pieces are arranged correspondingly to the support columns;

[0039] The adjusting handle is mounted on the supporting column, and the matching piece cooperates with the supporting column to limit the adjusting handle.

[0040] In this embodiment, the movement range of the adjustment handle can be effectively limited through the interaction between the matching piece and the support column, and the adjustment handle can be prevented from accidentally loosening or falling off during operation, thereby ensuring the safety and stability of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the three-dimensional structure of an adjustable handle of a bowl basket provided in an embodiment of the present application;

[0042] Figure 2 It is a schematic diagram of the exploded structure of an adjustable handle for a bowl basket provided in one embodiment of the present application;

[0043] Figure 3 It is a structural schematic diagram of a lifting roller assembly and a locking mechanism of an adjustable handle of a bowl basket provided in an embodiment of the present application;

[0044] Figure 4 yes Figure 3 A magnified schematic diagram of the local A in the middle;

[0045] Figure 5 It is a structural schematic diagram of the fixed position of the adjustable handle of the bowl basket provided in one embodiment of the present application;

[0046] Figure 6It is a structural schematic diagram of the lowered state of the adjustable handle of the bowl basket provided in one embodiment of the present application.

[0047] Reference numerals:

[0048] 1. Bowl basket; 2. Guide wire; 3. Lifting roller assembly; 4. Locking mechanism;

[0049] 31. Mounting plate; 32. Support plate; 41. Housing; 42. Lock block; 43. Adjustment handle; 44. Slider; 45. Elastic member; 46. Support column;

[0050] 411, upper cover plate; 412, lower cover plate; 421, elastic portion; 422, limiting portion; 431, first inclined surface; 432, support column; 433, limiting protrusion; 441, groove. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is described in detail, clearly and completely in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not used to limit the present disclosure.

[0052] In the description of this application, if there is a description of first or second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0053] Those skilled in the art should understand that, in the disclosure of the present application, the orientation or positional relationship indicated by terms such as "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present application.

[0054] The present application is further described in detail below in conjunction with the accompanying drawings. Figures 1 to 6 illustrate.

[0055] The present embodiment provides a structure of an adjustable handle for a bowl basket, which is applied in the technical field of dishwashers, such as Figures 1 to 6As shown, the bowl basket 1 includes a bowl basket 1, a lifting roller assembly 3 and a locking mechanism 4. Guide wires 2 are provided on both sides of the bowl basket 1. The guide wires 2 have a guiding function. The guide wires 2 are connected to the bowl basket 1. The lifting roller assembly 3 can move up and down relative to the guide wires 2, so that the user can easily adjust the height of the bowl basket 1 as needed to adapt to different usage scenarios and needs. The locking mechanism 4 is installed on both sides of the bowl basket 1. The locking mechanism 4 is located on one side of the lifting roller assembly 3. The locking mechanism 4 is used to lock and unlock the lifting roller assembly 3. The locking mechanism 4 can effectively lock the lifting roller assembly 3 to prevent accidental sliding or falling during use, thereby ensuring the safety of the user. By locking the lifting roller assembly 3, the locking mechanism 4 ensures the stability of the bowl basket 1 during use, thereby preventing tilting or falling due to improper operation.

[0056] In this embodiment, the locking mechanism 4 includes a locking block 42 and a pressable adjustment handle 43. The locking block 42 at least partially cooperates with the lifting roller assembly 3. The locking block 42 at least partially cooperates with the adjustment handle 43 to achieve the up and down adjustment of the bowl basket 1. The locking block 42 is elastic and will deform when the adjustment handle 43 applies pressure. It will return to its original shape after the pressure is released, thereby achieving free movement of the lifting roller assembly 3. When the user holds the adjusting handle 43 and pushes it upward, the lifting roller assembly 3 will slide from the locking block 42 along the guide wire 2 to the end of the sliding block 44 and abut against the end of the sliding block 44. The lifting roller assembly 3 can be accurately locked at the required position to achieve the up and down adjustment of the bowl basket 1. The locking block 42 is elastic. The locking block 42 locks the lifting roller assembly 3 by pressing the adjusting handle 43. By operating the adjusting handle 43, the user can control the state of the locking block 42. During the entire operation, the adjusting handle 43 and the lifting roller assembly 3 do not need to cooperate. The bowl basket 1 can be adjusted by the cooperation between the locking block 42 and the two, thereby improving the stability of the bowl basket 1 and the convenience of operation.

[0057] Further, such as Figures 2 to 6 As shown, the locking mechanism 4 further includes a slider 44, which is disposed between the locking block 42 and the lifting roller assembly 3. The lifting roller assembly 3 can slide up and down relative to the slider 44. The height of the slider 44 is higher than the height of the locking block 42, which can reduce the friction between the lifting roller assembly 3 and the slider 44, reduce wear, and extend the service life of the lifting roller assembly 3. The slider 44 is provided with a groove 441, and the guide wire 2 is at least partially installed in the groove 441, which can effectively prevent it from accidentally falling off during use, thereby ensuring the safety of the bowl basket 1 when adjusting the height.

[0058] Further, such as Figure 2As shown, the locking block 42 includes an elastic portion 421 and a limiting portion 422. The limiting portion 422 is a rectangular structure. The elastic portion 421 is connected to the limiting portion 422. The elastic portion 421 is used to lock and unlock the lifting roller assembly 3. The limiting portion 422 is located at one end of the elastic portion 421 away from the lifting roller assembly 3. The limiting portion 422 is used to limit the lifting roller assembly 3. The elastic portion 421 is tilted, and the elastic portion 421 is tilted toward the limiting portion 422. The highest point of the elastic portion 421 is flush with the highest point of the limiting portion 422, which can effectively prevent the lifting roller assembly 3 from falling out or accidentally sliding.

[0059] Further, such as Figure 4 As shown, the lifting roller assembly 3 includes a mounting plate 31 and a support plate 32. The mounting plate 31 is fixedly connected to the support plate 32. The support plate 32 is located between the mounting plate 31 and the adjusting handle 43. The support plate 32 is an L-shaped structure. The lifting roller assembly 3 has an ascending state and a descending state. When the lifting roller assembly 3 is in the descending state, the support plate 32 is located at an end of the elastic portion 421 away from the limiting portion 422. The support plate 32 abuts against the end of the elastic portion 421. The elastic portion 421 limits the support plate 32 to avoid accidental sliding or rebound of the lifting roller assembly 3 in the descending state, thereby ensuring the stability of the lifting roller assembly 3 during use.

[0060] like Figure 2 As shown, the end of the adjustment handle 43 is set to a first inclined surface 431, and the first inclined surface 431 is located at one end of the adjustment handle 43 close to the limiting portion 422. When the lifting roller assembly 3 is in a descending state, the first inclined surface 431 is close to the limiting portion 422, which can effectively limit the movement of the lifting roller assembly 3 and maintain stability in the descending state.

[0061] Further, such as Figure 2 As shown, the locking mechanism 4 also includes an elastic member 45 and a shell 41. The shell 41 is an L-shaped structure. The elastic member 45 is installed in the shell 41. The elastic member 45 is set as a compression spring. The locking block 42, the adjustment handle 43 and the slider 44 are all installed in the shell 41. When the user adjusts the bowl basket 1 up and down by pressing the adjustment handle 43, it is not easy to get the hand pinched, and the shell 41 can protect the adjustment handle 43, the locking block 42 and other components from damage, thereby extending the service life of the locking mechanism 4. The elastic member 45 can provide a buffering effect. The buffering effect of the elastic member 45 can reduce the direct impact between the lifting roller assembly 3 and other components, reduce wear, and extend the service life of the entire locking mechanism 4. Among them, the shell 41 is provided with an opening, and the adjustment handle 43 is at least partially located at the opening. The shell 41 is an L-shaped structure, allowing the user to easily contact and operate the adjustment handle 43.

[0062] Among them, a pillar 432 is provided on the adjustment handle 43, and the elastic member 45 is sleeved on the pillar 432. The pillar 432 protrudes in the direction away from the opening. The pillar 432 is mainly used to support the elastic member 45 to ensure that the elastic member 45 maintains a stable and effective working state during use. Through the support of the pillar 432, the elastic member 45 can provide a uniform reaction force when pressed.

[0063] Among them, a limiting protrusion 433 and a convex block are provided on the adjusting handle 43, the limiting protrusion 433 extends in a direction away from the first inclined surface 431, the limiting protrusion 433 protrudes toward the direction of the bowl basket 1, an inclined surface is provided at the end of the elastic part 421, and the convex block is arranged between the limiting protrusion 433 and the lifting roller assembly 3, the inclined surface is located on the side of the end of the elastic part 421 close to the adjusting handle 43, the inclined surface occupies approximately half of the end of the elastic part 421, and the shape of the convex block is smaller than the shape of the limiting protrusion 433. When the lifting roller assembly 3 is in a descending state, the limiting protrusion 433 and the convex block both abut against the inclined surface, and the inclined surface is arranged obliquely downward. The limiting protrusion 433 and the convex block are triangular structures, which can provide a stable support point, so that the limiting protrusion 433 is more stable when pressed on the slider 44, and the contact between the limiting protrusion 433 and the inclined surface can reduce the direct friction between the lifting roller assembly 3 and other components, reduce wear, and extend the service life of the entire locking mechanism 4.

[0064] Further, such as Figure 2 As shown, the housing 41 includes an upper cover plate 411 and a lower cover plate 412, the upper cover plate 411 is snap-fitted with the lower cover plate 412, at least three support columns 46 are provided on the lower cover plate 412, a matching piece is provided on the upper cover plate 411, the matching piece is arranged correspondingly to the support column 46, the adjustment handle 43 is mounted on the support column 46, and the matching piece cooperates with the support column 46 to limit the adjustment handle 43. Among them, the support column 46 is provided with a through hole for inserting the connecting column, the through hole cooperates with the connecting column to realize the plug-in connection between the support column 46 and the connecting column, the connecting column and the through hole are arranged correspondingly, which can effectively limit the movement range of the adjustment handle 43, ensure that it is operated within a predetermined range, prevent damage or insecurity caused by excessive adjustment, and provide a solid support for the adjustment handle 43, ensure that it remains stable during use, and prevent shaking or tilting due to external forces.

[0065] Working principle: when the adjusting handle 43 is held and pressed upward, the compressed elastic member 45 abuts against the inner wall of the shell 41, and the first inclined surface 431 of the adjusting handle 43 presses the limiting portion 422. Under the action of the limiting protrusion 433, the locking block 42 is pressed down to the limit position, and the limiting of the lifting roller assembly 3 is released. The lifting roller assembly 3 is in a free movable state. At this time, the bowl basket 1 can slide freely under its own gravity, so that the user can get a larger placement space; after the adjusting handle 43 is released, the adjusting handle 43 is reset under the action of the locking block 42, and the limiting is achieved by the elastic reset of the locking block 42.

[0066] The present application is described in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A structure of an adjustable handle for a bowl and basket, characterized in that: include: A bowl basket (1), wherein guide steel wires (2) are provided on both sides of the bowl basket (1); A lifting roller assembly (3), wherein the lifting roller assembly (3) is capable of moving up and down relative to the guide wire (2); A locking mechanism (4), the locking mechanism (4) being installed on both sides of the bowl basket (1), and the locking mechanism (4) being used to lock and unlock the lifting roller assembly (3); The locking mechanism (4) comprises a pressable adjustment handle (43) and a locking block (42); the locking block (42) at least partially cooperates with the lifting roller assembly (3) and at least partially cooperates with the adjustment handle (43) to achieve the up and down adjustment of the bowl basket (1); The locking block (42) is elastic, and the locking block (42) locks the lifting roller assembly (3) by pressing the adjustment handle (43).

2. The structure of the bowl basket adjustable handle according to claim 1, characterized in that: The locking block (42) comprises an elastic portion (421) and a limiting portion (422), the elastic portion (421) being connected to the limiting portion (422), and the elastic portion (421) being used to lock and unlock the lifting roller assembly (3); The limiting portion (422) is located at an end of the elastic portion (421) away from the lifting roller assembly (3), and the limiting portion (422) is used to limit the lifting roller assembly (3).

3. The structure of the bowl and basket adjustable handle according to claim 2, characterized in that: The elastic portion (421) is arranged obliquely, the elastic portion (421) is inclined towards the limiting portion (422), and the highest point of the elastic portion (421) is flush with the highest point of the limiting portion (422).

4. The structure of the bowl basket adjustable handle according to claim 1, characterized in that: The locking mechanism (4) further comprises a slider (44), wherein the slider (44) is arranged between the locking block (42) and the lifting roller assembly (3), and the lifting roller assembly (3) can slide up and down relative to the slider (44); The sliding block (44) is provided with a groove (441), and the guide wire (2) is at least partially installed in the groove (441).

5. The structure of the bowl basket adjustable handle according to claim 2, characterized in that: The lifting roller assembly (3) comprises a mounting plate (31) and a support plate (32), wherein the mounting plate (31) is fixedly connected to the support plate (32), the support plate (32) is located between the mounting plate (31) and the adjustment handle (43), and the support plate (32) is an L-shaped structure; The lifting roller assembly (3) has an ascending state and a descending state. When the lifting roller assembly (3) is in the descending state, the support plate (32) is located at an end of the elastic portion (421) away from the limiting portion (422).

6. The structure of the bowl basket adjustable handle according to claim 2, characterized in that: The end of the adjusting handle (43) is configured as a first inclined surface (431), and the first inclined surface (431) is located at one end of the adjusting handle (43) close to the limiting portion (422); Wherein, when the lifting roller assembly (3) is in a descending state, the first inclined surface (431) is in close proximity to the limiting portion (422).

7. The structure of the bowl basket adjustable handle according to claim 2, characterized in that: The locking mechanism (4) further comprises a housing (41) and an elastic member (45), wherein the elastic member (45) is installed in the housing (41), and the elastic member (45) is connected to the adjustment handle (43); The shell (41) is provided with an opening, the adjustment handle (43) is at least partially located at the opening, and the shell (41) is an L-shaped structure.

8. The structure of the bowl basket adjustable handle according to claim 7, characterized in that: The adjusting handle (43) is provided with a support (432), the elastic member (45) is sleeved on the support (432), the support (432) protrudes in a direction away from the opening, and the support (432) is used to support the elastic member (45); Wherein, the support (432) is a cross-shaped structure.

9. The structure of the bowl basket adjustable handle according to claim 6, characterized in that: The adjusting handle (43) is provided with a limiting protrusion (433), and the limiting protrusion (433) protrudes toward the bowl basket (1); The end of the elastic portion (421) is provided with an inclined surface, and when the lifting roller assembly (3) is in a descending state, the limiting protrusion (433) abuts against the inclined surface, and the limiting protrusion (433) is a triangular structure.

10. The structure of the bowl and basket adjustable handle according to claim 8, characterized in that: The housing (41) comprises an upper cover plate (411) and a lower cover plate (412), wherein the upper cover plate (411) is connected to the lower cover plate (412); Wherein, at least three support columns (46) are provided on the lower cover plate (412), and a matching piece is provided on the upper cover plate (411), and the matching piece is arranged corresponding to the support column (46); The adjusting handle (43) is mounted on the supporting column (46), and the matching piece cooperates with the supporting column (46) to limit the position of the adjusting handle (43).

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