Hidden door and window handle structure

Abstract

The utility model discloses a hidden door and window handle structure, which relates to the technical field of door and window components, solves the problems that indoor personnel are easy to collide with a door and window handle and the locking is not tight due to the fact that the handle is not rotated in place, and comprises a handle base, a handle, a square shaft combined top cover, a square shaft combined bottom cover, a square shaft and an inner meshing gear, a pair of inner meshing cylindrical gears with the transmission ratio of 1: 2 is adopted, 180-degree rotation of the handle is converted into 90-degree rotation of the square shaft, and meanwhile, the magnet and the limiting wall are matched, so that the handle is accurate in position, hidden and perfectly attached to the base when a door and a window are in various states such as locking, flat opening or suspended opening; the hidden handle is flush with the inner side of the window sash, so that the overall attractiveness of the window sash is enhanced. The potential collision danger of a traditional door and window handle is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of door and window components, and in particular to a hidden door and window handle structure. Background Art

[0002] Traditional door and window handles are installed on the inside of the window sash, and it is very easy for children to collide with the door and window handles when playing or cleaning indoors. When locking, the traditional door and window handles may not be rotated into place, resulting in "half-matching" between the window sash locking point and the lock block, and the window sash is in a "false locked" state, which poses a certain safety risk. Utility Model Content

[0003] In view of the above-mentioned problems that indoor personnel are prone to collision with door and window handles and the handles are not rotated properly, resulting in poor locking, the purpose of the utility model is to provide a hidden door and window handle structure.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A hidden door and window handle structure, which includes: a handle base 1, a handle 2, a square shaft combination top cover 3, a square shaft combination bottom cover 4, a square shaft 5 and a transmission mechanism, the handle base 1 includes: a rectangular plate and a limiting wall 101, the rear side of the rectangular plate is installed on the window sash profile, the front side periphery of the rectangular plate is connected to the limiting wall 101, the limiting wall 101 and the rectangular plate are surrounded to form a hidden groove, the middle part of the rectangular plate is provided with a square shaft hole 102, the square shaft combination bottom cover 4 is located on the rear side of the rectangular plate and is installed in the square shaft hole 102, the square shaft combination top cover 3 is located on the front side of the handle base 1 and is rotatably installed on the square shaft combination bottom cover 4, and the square shaft combination bottom cover 4 is on the A limiting hole 401 is provided, and the square shaft 5 is rotatably installed in the limiting hole 401. A transmission mechanism is provided between the square shaft combination top cover 3 and the square shaft combination bottom cover 4. The square shaft combination top cover 3 and the square shaft 5 are connected through the transmission mechanism. A handle 2 is rotatably installed on the upper and lower sides of the square shaft combination top cover 3. When the hidden door and window handle structure is in a hidden state, the two handles 2 are both located in the hidden groove. When the hidden door and window handle structure is in use, the two handles 2 are rotated to the outside of the hidden groove. The square shaft combination top cover 3 is driven to rotate by manually rotating the two handles 2, thereby driving the square shaft 5 to rotate in the limiting hole 401.

[0006] The above-mentioned hidden door and window handle structure, wherein an external gear limiting column 302 is provided in the middle of the square shaft combination top cover 3, and the square shaft 5 comprises: a shaft body 501 and an internal gear positioning column 502, a plurality of internal gear positioning columns 502 are parallel and arranged at the end of the shaft body 501, a plurality of internal gear positioning columns 502 are arranged in a circular shape with equal spacing, and a plurality of internal gear positioning columns 502 are all located in the limiting hole 401.

[0007] The above-mentioned concealed door and window handle structure, wherein the transmission mechanism is an internally meshing gear 6, and the internally meshing gear 6 includes: an external gear 601 and an internal gear 602. The external gear 601 is installed on the external gear limit post 302, and the internal gear 602 is installed in a plurality of internal gear positioning posts 502. The external tooth portions of the external gear 601 and the internal gear 602 are meshed with each other.

[0008] The above-mentioned concealed door and window handle structure, further including: a rotating shaft 202 and a magnet 203. Both the upper and lower sides of the square shaft combination top cover 3 are provided with top cover rotating shaft cylinders 301, and the inner end of the handle 2 is provided with a handle rotating shaft cylinder 201. Each of the handle rotating shaft cylinders 201 and one of the top cover rotating shaft cylinders 301 are rotationally connected by one of the rotating shafts 202. The front end face of the handle 2 is provided with a magnet mounting groove, and each magnet mounting groove is installed with a magnet 203.

[0009] The above-mentioned concealed door and window handle structure, wherein the front side of the outer end of the handle 2 is provided with an inwardly concave unlocking handle 204.

[0010] The above-mentioned concealed door and window handle structure, further including: an iron sheet 103. Two iron sheet mounting grooves are provided on the front side of the rectangular plate, and the two iron sheet mounting grooves are respectively arranged on the upper and lower sides of the square shaft hole 102. Each iron sheet mounting groove is installed with an iron sheet 103. When the concealed door and window handle structure is in the concealed state, the magnet 203 on each handle 2 is magnetically connected to an iron sheet 103. When the concealed door and window handle structure is in the use state, the magnets 203 on the two handles 2 attract each other.

[0011] The above-mentioned concealed door and window handle structure, wherein a fastener counterbore 104 is opened at the bottom of each iron sheet mounting groove, and a fastener is inserted into each fastener counterbore 104. The handle base 1 is installed on the window frame profile through two fasteners.

[0012] The above-mentioned concealed door and window handle structure, wherein the transmission ratio of the internally meshing gear 6 is 1:2.

[0013] The above-mentioned concealed door and window handle structure, wherein the limit hole 401 is eccentrically arranged, and the axis of the limit hole 401 is parallel to the axis of the external gear limit post 302.

[0014] The above-mentioned concealed door and window handle structure, wherein the end of the shaft body 501 is provided with a circular limit plate, the circular limit plate is rotatably installed in the limit hole 401, and the inner wall of the limit hole 401 is provided with an annular limit portion with a reduced inner diameter, and the annular limit portion is used for limiting the circular limit plate.

[0015] Due to the adoption of the above-mentioned technology, the positive effects of the present utility model compared with the prior art are:

[0016] (1) The utility model adopts a pair of internally meshed cylindrical gears with a transmission ratio of 1:2 to convert the 180° rotation of the handle into a 90° rotation of the square shaft. At the same time, it cooperates with magnets and limit walls to achieve accurate, hidden and perfectly fitted handle positions in various states of doors and windows such as locked, horizontally opened or suspended;

[0017] (2) The hidden handle of the utility model is flush with the inner side of the window sash, which enhances the overall aesthetics of the window sash and reduces the potential collision risk of traditional door and window handles. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a structural schematic diagram of a hidden door and window handle structure.

[0019] Figure 2 The utility model is a schematic diagram of the assembly position of a hidden door and window handle structure.

[0020] Figure 3 It is a schematic diagram of the assembly position between a handle and a square shaft combined top cover of a hidden door and window handle structure of the utility model.

[0021] Figure 4 The utility model is a schematic diagram of the assembly position between a square shaft combined top cover, a square shaft and an internal meshing gear of a hidden door and window handle structure.

[0022] Figure 5 The utility model is a schematic diagram of the meshing position of the internal meshing gear of the hidden door and window handle structure.

[0023] Figure 6 It is a schematic diagram of the first step of an embodiment of a hidden door and window handle structure of the utility model.

[0024] Figure 7 It is a schematic diagram of the second step of an embodiment of a hidden door and window handle structure of the utility model.

[0025] Figure 8 This is a schematic diagram of the third step of an embodiment of a hidden door and window handle structure of the utility model.

[0026] Figure 9 This is a schematic diagram of the fourth step of an embodiment of a hidden door and window handle structure of the utility model.

[0027] In the accompanying drawings: 1. handle base; 2. handle; 3. square shaft combined top cover; 4. square shaft combined bottom cover; 5. square shaft; 6. internal meshing gear; 101. limiting wall; 102. square shaft hole; 103. iron sheet; 104. fastener countersunk hole; 201. handle rotating shaft cylinder; 202. rotating shaft; 203. magnet; 204. unlocking knob; 301. top cover rotating shaft cylinder; 302. external gear limiting column; 401. limiting hole; 501. shaft body; 502. internal gear positioning column; 601. external gear; 602. internal gear. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0029] Please refer to Figures 1 to 9 As shown, a hidden door and window handle structure is shown, which includes: a handle base 1, a handle 2, a square shaft combination top cover 3, a square shaft combination bottom cover 4, a square shaft 5 and a transmission mechanism. The handle base 1 includes: a rectangular plate and a limiting wall 101. The rear side of the rectangular plate is installed on the window sash profile. The front periphery of the rectangular plate is connected to the limiting wall 101. The limiting wall 101 and the rectangular plate are surrounded to form a hidden groove. A square shaft hole 102 is provided in the middle of the rectangular plate. The square shaft combination bottom cover 4 is located at the rear side of the rectangular plate and is installed in the square shaft hole 102. The square shaft combination top cover 3 is located at the front side of the handle base 1 and is rotatably installed on the square shaft combination bottom cover 4. The square shaft combination A limiting hole 401 is provided on the bottom cover 4, and the square shaft 5 is rotatably installed in the limiting hole 401. A transmission mechanism is provided between the square shaft combination top cover 3 and the square shaft combination bottom cover 4. The square shaft combination top cover 3 and the square shaft 5 are connected through the transmission mechanism. A handle 2 is rotatably installed on the upper and lower sides of the square shaft combination top cover 3. When the hidden door and window handle structure is in a hidden state, the two handles 2 are both located in the hidden groove. When the hidden door and window handle structure is in use, the two handles 2 are rotated to the outside of the hidden groove. The square shaft combination top cover 3 is driven to rotate by manually rotating the two handles 2, and then the square shaft 5 is driven to rotate in the limiting hole 401.

[0030] Furthermore, in a preferred embodiment, an external gear limiting column 302 is provided in the middle of the square shaft assembly top cover 3, and the square shaft 5 includes: a shaft body 501 and an internal gear positioning column 502, a plurality of internal gear positioning columns 502 are parallel and arranged at the end of the shaft body 501, and the plurality of internal gear positioning columns 502 are arranged in a circular shape with equal intervals, and the plurality of internal gear positioning columns 502 are all located in the limiting hole 401.

[0031] Further, in a preferred embodiment, the transmission mechanism is an internal meshing gear 6, and the internal meshing gear 6 includes: an external gear 601 and an internal gear 602. The external gear 601 is mounted on the external gear limit post 302, and the internal gear 602 is mounted within a plurality of internal gear positioning posts 502. The external tooth portions of the external gear 601 and the internal gear 602 are meshed with each other.

[0032] Further, in a preferred embodiment, it further includes: a rotating shaft 202 and a magnet 203. Both the upper and lower sides of the square shaft combined top cover 3 are provided with top cover rotating shaft cylinders 301, and the inner end portion of the handle 2 is provided with a handle rotating shaft cylinder 201. Each handle rotating shaft cylinder 201 and a top cover rotating shaft cylinder 301 are rotationally connected by a rotating shaft 202. A magnet mounting groove is provided on the front end face of the handle 2, and a magnet 203 is mounted within each magnet mounting groove.

[0033] Further, in a preferred embodiment, a concave unlocking handle 204 is provided on the front side of the outer end portion of the handle 2, facilitating the forward rotation of the handle 2 to bring the hidden door and window handle structure into a use state.

[0034] Further, in a preferred embodiment, it further includes: iron sheets 103. Two iron sheet mounting grooves are provided on the front side of the rectangular plate, and the two iron sheet mounting grooves are respectively provided on the upper and lower sides of the square shaft hole 102. An iron sheet 103 is mounted within each iron sheet mounting groove. When the hidden door and window handle structure is in a hidden state, the magnet 203 on each handle 2 and an iron sheet 103 are magnetically connected. When the hidden door and window handle structure is in a use state, the magnets 203 on the two handles 2 attract each other.

[0035] Further, in a preferred embodiment, a fastener counterbore 104 is provided at the bottom of each iron sheet mounting groove, and a fastener is inserted into each fastener counterbore 104. The fastener can be a screw, and the handle base 1 is mounted on the window sash profile through two fasteners.

[0036] Further, in a preferred embodiment, the transmission ratio of the internal meshing gear 6 is 1:2.

[0037] Further, in a preferred embodiment, the limiting hole 401 is eccentrically arranged, and the axis of the limiting hole 401 is parallel to the axis of the external gear limit post 302.

[0038] Further, in a preferred embodiment, a circular limiting plate is provided at the end of the shaft body 501, and the circular limiting plate is rotatably mounted within the limiting hole 401. An annular limiting portion with a reduced inner diameter is provided on the inner wall of the limiting hole 401, and the annular limiting portion is used to limit the circular limiting plate.

[0039] The above are only preferred embodiments of the present invention, and do not thus limit the implementation manners and protection scope of the present invention.

[0040] The utility model also has the following implementation methods based on the above:

[0041] In a further embodiment of the utility model, an assembly groove matching the handle base 1 is opened on the window sash profile, and the handle base 1 is assembled as a whole in the assembly groove to hide the handle. The outer edge of the limiting wall 101 and the outer surface of the window sash profile are located in the same plane.

[0042] In a further embodiment of the utility model, the hidden handle in the structure is flush with the inner side of the window sash, thereby enhancing the overall aesthetics of the window sash and reducing the potential collision risk of traditional door and window handles.

[0043] In a further embodiment of the utility model, the structure adopts a pair of internally meshing cylindrical gears with a transmission ratio of 1:2 to convert the 180° rotation of the handle 2 into a 90° rotation of the square shaft 5, and at the same time cooperates with magnets and limit walls to achieve accurate, hidden and perfect fit of the handle position of the doors and windows in various states such as locked, open or suspended.

[0044] In a further embodiment of the present invention, the installation method:

[0045] Step 1: The handle 2 is assembled with the square shaft assembly top cover 3 via the rotating shaft 202;

[0046] Step 2: Assemble the external gear 601, the external gear limiting column 302 and the square shaft assembly top cover 3;

[0047] Step 3: Place the square shaft assembly top cover 3 into the handle base 1;

[0048] Step 4: The internal gear 602 is assembled with the square shaft 5 through the internal gear positioning column 502;

[0049] Step 5: Adjust the relative position and mesh the outer gear 601 with the inner gear 602;

[0050] Step 6: Pass the square shaft 5 through the limiting hole 401 of the square shaft assembly bottom cover 4, and assemble the square shaft assembly bottom cover 4 with the square shaft assembly top cover 3;

[0051] Step 7: Lift the handle 2 and install the handle base 1 on the window sash profile through the fastener countersunk hole 104;

[0052] Step 8: Install the iron sheet 103 at the corresponding position of the handle base 1, return the handle 2 to its original position, and the installation is completed.

[0053] In a further embodiment of the present invention, the method of use is:

[0054] Step 1: Lift the upper handle 2 by unlocking the buckle 204, and then lift the lower handle 2 by unlocking the buckle 204. Figure 6 and Figure 7as shown;

[0055] Step 2: Hold the upper and lower handle pieces 2 by hand and rotate them 180°. As Figures 7 to 9 shown, return the upper and lower handle pieces 2 to their original positions. The magnet 203 inside the handle 2 attracts the iron sheet 103, and together with the limiting wall 101 of the handle base 1, ensures the stability of the handle 2;

[0056] In the above Step 1, due to the existence of magnets 203 with opposite magnetic poles inside the two handles 2, they attract each other when the distance is close, and the lower handle 2 will not fall due to gravity, and the handle 2 remains in an operable state;

[0057] In the above Step 2, for the casement or casement with top-hung window type, at this time the window sash is in the casement state;

[0058] Step 3: Repeat Step 1 and Step 2, and the casement state of the casement with top-hung window type can be changed to the top-hung state;

[0059] Step 4: After closing the window sash, repeat Step 1 and hold the upper and lower handle pieces 2 by hand, and rotate them 360° in the reverse direction to lock the window sash. Then return the upper and lower handle pieces 2 to their original positions. The magnet 203 inside the handle 2 attracts the iron sheet 103, and together with the limiting wall 101 of the handle base 1, ensures the stability of the handle 2.

[0060] In a further embodiment of the present utility model, the structural principle is as follows: The window sash drives the rack structure inside the lock box through the rotation of the handle 2 and the square shaft 5, and then drives the pull rod, lock point, etc. in the hardware through the transmission bar to control the locking, opening or top-hung state of the window sash. Generally, every time the square shaft 5 rotates 90°, the opening and closing state of the window sash changes once. The handle grip of a common handle and the square shaft are generally an integral structure, and the rotation angle of the square shaft is the same as the rotation angle of the handle. In order to ensure that the handle can maintain a hidden and limited state in any state of the window sash, a pair of internally meshing cylindrical gears are adopted, that is, the external gear 601 meshes with the internal gear 602, and the transmission ratio between the two is 1:2. When the handle 2 rotates, it drives the external gear 601 to rotate by the same angle. At this time, the internal gear 602 is driven. Due to the transmission ratio relationship, its rotation angle is half of that of the external gear 601, that is, the rotation angle of the driven square shaft 5 is also half of that of the handle 2, achieving the purpose of converting the 180° rotation of the handle 2 into the 90° rotation of the square shaft 5.

[0061] In a further embodiment of the present utility model, the structural features are as follows: The hidden door and window handle structure is simple, beautiful and concise, and has the characteristics of preventing misoperation and convenient installation.

[0062] In a further embodiment of the present utility model, various connection methods such as key connection, glue connection, and fit connection can be adopted between the external gear 601 and the top cover rotating shaft cylinder 301, and various connection methods such as glue connection and fit connection can be adopted between the internal gear 602 and the external gear limiting column 302.

[0063] In a further embodiment of the utility model, an assembly groove matching the handle base 1 is opened on the window sash profile, and the handle base 1 is assembled as a whole in the assembly groove, so as to hide the handle and prevent accidental touch, while preventing indoor personnel from colliding with the door and window handles.

[0064] In a further embodiment of the utility model, the handle 2 can be rotated 180° before it can be turned and hidden in the hidden groove formed by the limiting wall 101 and the rectangular plate, thereby avoiding the problem of poor locking due to the handle 2 not being rotated enough, that is, the handle 2 not being able to be hidden in the hidden groove due to not being rotated enough, which is easy for the operator to detect.

[0065] In a further embodiment of the utility model, the square shaft combination bottom cover 4 is installed on the window sash profile and is fixed in a relative position to the handle base 1, the square shaft combination bottom cover 4 does not rotate, the limiting hole 401 is eccentrically arranged, the square shaft 5 is rotatably installed in the limiting hole 401, the square shaft combination top cover 3 is rotatably installed in the square shaft hole 102, the square shaft combination top cover 3 and the square shaft 5 are connected by an internal meshing gear 6, and the square shaft 5 can be rotated in the limiting hole 401 by rotating the square shaft combination top cover 3, thereby realizing the switching of the door and window states.

[0066] In a further embodiment of the utility model, the two handles 2 are rotatably installed on the opposite sides of the square axis combination top cover 3 through the rotating shaft 202. When the two handles 2 are in a hidden state, the two handles 2 and the square axis combination top cover 3 are all located in a hidden groove formed by the limiting wall 101 and the rectangular plate, thereby realizing the hiding function of the entire hidden door and window handle structure, preventing accidental touch, and preventing indoor personnel from colliding with the door and window handles.

[0067] In a further embodiment of the present invention, an unlocking button 204 is provided at the end of the handle 2 to facilitate the operator to remove the handle 2 from the hidden groove.

[0068] In a further embodiment of the utility model, the magnetic poles of the magnets 203 on the two handles 2 are in opposite directions, ensuring that the magnets 203 on the two handles 2 attract each other when the hidden door and window handle structure is in use.

[0069] In a further embodiment of the utility model, by providing an iron sheet 103 and a magnet 203, when the hidden door and window handle structure is in a hidden state, each magnet 203 and an iron sheet 103 attract each other, and in the absence of external force, the two handles 2 are always located in the hidden groove.

[0070] The above are only the preferred embodiments of the present utility model, and thus do not limit the implementation manners and protection scope of the present utility model. For those skilled in the art, it should be realized that all the solutions obtained by equivalent substitutions and obvious changes made by using the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hidden door and window handle structure, characterized in that: include: A handle base (1), a handle (2), a square shaft combination top cover (3), a square shaft combination bottom cover (4), a square shaft (5) and a transmission mechanism. The handle base (1) comprises: a rectangular plate and a limiting wall (101). The rear side of the rectangular plate is mounted on a window sash profile. The front periphery of the rectangular plate is connected to the limiting wall (101). The limiting wall (101) and the rectangular plate are combined to form a hidden groove. A square shaft hole (102) is provided in the middle of the rectangular plate. The square shaft combination bottom cover (4) is located at the rear side of the rectangular plate and is installed in the square shaft hole (102). The square shaft combination top cover (3) is located at the front side of the handle base (1) and is rotatably installed on the square shaft combination bottom cover (4). The square shaft combination bottom cover (4) is provided with a limiting hole (41). 01), the square shaft (5) is rotatably mounted in the limiting hole (401), a transmission mechanism is provided between the square shaft assembly top cover (3) and the square shaft assembly bottom cover (4), the square shaft assembly top cover (3) and the square shaft (5) are connected by the transmission mechanism, a handle (2) is rotatably mounted on the upper and lower sides of the square shaft assembly top cover (3), when the hidden door and window handle structure is in a hidden state, the two handles (2) are both located in the hidden groove, when the hidden door and window handle structure is in a use state, the two handles (2) are both rotated to the outside of the hidden groove, and the square shaft assembly top cover (3) is driven to rotate by manually rotating the two handles (2), thereby driving the square shaft (5) to rotate in the limiting hole (401).

2. The hidden door and window handle structure according to claim 1, characterized in that: An external gear limiting column (302) is provided in the middle of the square shaft assembly top cover (3). The square shaft (5) comprises: a shaft body (501) and an internal gear positioning column (502). A plurality of internal gear positioning columns (502) are parallel and arranged at the end of the shaft body (501). The plurality of internal gear positioning columns (502) are arranged in a circular shape at equal intervals. The plurality of internal gear positioning columns (502) are all located in the limiting hole (401).

3. The hidden door and window handle structure according to claim 2, characterized in that: The transmission mechanism is an internal meshing gear (6), which comprises an external gear (601) and an internal gear (602), wherein the external gear (601) is mounted on an external gear limiting column (302), and the internal gear (602) is mounted in a plurality of internal gear positioning columns (502), and the external tooth portion of the external gear (601) is meshed with the external tooth portion of the internal gear (602).

4. The hidden door and window handle structure according to claim 1, characterized in that: Also includes: A rotating shaft (202) and a magnet (203), a top cover rotating shaft cylinder (301) is provided on both the upper and lower sides of the square shaft combined top cover (3), a handle rotating shaft cylinder (201) is provided at the inner end of the handle (2), each of the handle rotating shaft cylinders (201) and a top cover rotating shaft cylinder (301) are rotatably connected via a rotating shaft (202), a magnet mounting groove is provided on the front end surface of the handle (2), and a magnet (203) is installed in each magnet mounting groove.

5. The hidden door and window handle structure according to claim 4, characterized in that: An inwardly concave unlocking button (204) is provided on the front side of the outer end of the handle (2).

6. The hidden door and window handle structure according to claim 5, characterized in that: Also includes: The iron sheet (103) is provided with two iron sheet installation grooves on the front side of the rectangular plate, and the two iron sheet installation grooves are respectively provided on the upper and lower sides of the square shaft hole (102), and an iron sheet (103) is installed in each iron sheet installation groove. When the hidden door and window handle structure is in a hidden state, the magnet (203) on each handle (2) is magnetically connected to an iron sheet (103), and when the hidden door and window handle structure is in a use state, the magnets (203) on the two handles (2) attract each other.

7. The hidden door and window handle structure according to claim 6, characterized in that: A fastener countersunk hole (104) is provided at the bottom of each iron sheet installation groove, a fastener is inserted into each fastener countersunk hole (104), and the handle base (1) is installed on the window sash profile through two fasteners.

8. The hidden door and window handle structure according to claim 3, characterized in that: The transmission ratio of the internal gear (6) is 1:

2.

9. The hidden door and window handle structure according to claim 2, characterized in that: The limiting hole (401) is eccentrically arranged, and the axis of the limiting hole (401) is parallel to the axis of the external gear limiting column (302).

10. The hidden door and window handle structure according to claim 9, characterized in that: A circular limiting plate is provided at the end of the shaft body (501), and the circular limiting plate is rotatably installed in the limiting hole (401). The inner wall of the limiting hole (401) is provided with an annular limiting portion with a reduced inner diameter, and the annular limiting portion is used to limit the circular limiting plate.

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