A head positioning device for children's vision testing instrument

Abstract

The utility model discloses a head positioning device for a children's vision detection instrument, which belongs to the technical field of medical instruments. It comprises a support frame and a support plate for lifting a child's chin, a support rod is welded on the bottom surface of the support plate, a fixing block is welded on the inner side wall of the support frame, a side surface of the fixing block is rotatably connected to a rotating rod through an opened through groove, two threaded rods with reverse threads are welded on both end surfaces of the rotating rod, threaded blocks are threadedly connected to the threaded rods, an L-shaped connecting plate is fixedly connected to the top surface of the threaded block, a clamping plate is welded on the end surface of the connecting plate, U-shaped fixing plates are fixedly connected to the two ends of the side surface of the clamping plate, a plug-in plate is slidably connected to the inner side wall of the fixing plate, cotton pads are fixedly connected to the adjacent sides of the two plug-in plates, a limiting rod is plugged into the top surface of the plug-in plate through the opened through groove, and the bottom surface of the limiting rod is welded to the fixing plate. The utility model provides a buffering and protective effect by arranging a cotton pad that is easy to disassemble, thereby improving the safety of the device in use.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, in particular to a head positioning device of a children's vision detection instrument. Background Art

[0002] Children's use of electronic products can easily reduce their eyesight, so they need to use vision testing instruments to test their eyesight. The detection head of the vision testing instrument can detect the child's eyes to prevent the child's head from shaking and deviating, which would reduce the detection accuracy of the vision testing instrument on the child's eyesight. A head positioning device is needed to clamp and fix the child's head. Since the child's head is relatively fragile and there is no buffer protection structure, it is very easy for the child to suffer head injury, reducing the safety of using the head positioning device.

[0003] Example (authorization announcement number is CN220141626U) A head positioning device for a child vision detection instrument. The utility model solves the problem in the prior art that the detection instrument detection head and the child's eyes need to be repositioned every time the child moves. A lifting assembly for driving the lower head bracket to perform lifting and lowering movements is arranged on the lower side of the head bracket. The lifting assembly drives the two head clamps to perform horizontal relative movement through the transmission assembly. When the child's head presses down the head bracket, the lifting assembly descends and drives the two head clamps to move relatively inwards through the transmission assembly to press against the two sides of the child's head, and then the detection head and the child are positioned. In this way, when the child moves around or leaves during the detection, the next detection only requires the child to place the head on the lower head bracket and press it up and down. The two head clamps press against the two sides of the child's head to align the detection head, and there is no need to reposition the detection head. However, the device does not consider that when clamping the child's head, the child's head is relatively fragile and there is no buffer protection structure, which can easily cause injury to the child's head, reducing the safety of the head positioning device. Utility Model Content

[0004] The utility model aims to provide a head positioning device for a children's vision testing instrument to solve the problems raised in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a head positioning device for a children's vision testing instrument, comprising a support frame and a support plate for supporting the child's chin, a support rod welded to the bottom surface of the support plate, a fixed block welded to the inner wall of the support frame, the side of the fixed block is rotatably connected to the rotating rod through an opened through groove, two threaded rods with reverse threads are welded to the two end surfaces of the rotating rod, the threaded rods are threadedly connected to the threaded blocks, an L-shaped connecting plate is fixedly connected to the top surface of the threaded block, a clamping plate is welded to the end surface of the connecting plate, U-shaped fixing plates are fixedly connected to the two ends of the side of the clamping plate, a plug-in plate is slidably connected to the inner wall of the fixing plate, cotton pads are fixedly connected to the adjacent sides of the two plug-in plates, a limit rod is plugged into the top surface of the plug-in plate through the opened through groove, and the bottom surface of the limit rod is welded to the fixing plate.

[0006] Preferably, the bottom surface of the support rod is welded to the fixed block, and the side surface of the support frame is rotatably connected to the rotating block via a through slot.

[0007] Preferably, the end surface of the rotating block is welded to the threaded rod on the left, and the bottom surface of the fixed block is fixedly connected with the threaded rod.

[0008] Preferably, the screw rod is threadedly connected with a threaded sleeve, and two push plates are welded to the side of the threaded sleeve.

[0009] Preferably, a limit bearing is interference fit on the outer circumference of the threaded sleeve, and an outer ring of the limit bearing is embedded and fixedly connected with an internal hollow connecting rod.

[0010] Preferably, the top surface of the connecting rod is in sliding frictional contact with the two push plates, and the two side surfaces of the connecting rod are slidably connected to the limiting blocks through the through grooves provided therein.

[0011] Preferably, a limiting plate is welded on adjacent sides of the two limiting blocks, and the side surface of the limiting plate is slidably connected to the inner side wall of the connecting rod.

[0012] Preferably, the top surface of the limiting plate is fixedly connected to the screw rod, and the bottom surface of the connecting rod is welded with a bottom plate.

[0013] Compared with the prior art, the technical effects and advantages of the utility model are as follows:

[0014] The head positioning device of the children's vision testing instrument facilitates the synchronous rotation of two threaded rods with reverse threads during transmission through the provided rotating block, so that the threaded block moves in the opposite direction along the threaded path of the threaded rod. The provided connecting plate provides connection and support, and facilitates adjustment of the lateral spacing between the two clamping plates, so as to adapt to the child's head for clamping and fixing, thereby preventing the child's head from shaking and reducing the detection accuracy of the vision testing instrument for the child's vision. The provided cotton pad provides a buffering and protective effect on the child's head, preventing the child's head from being relatively fragile and causing injury to the child's head during clamping, thereby improving the safety of the device, facilitating the removal of the limit rod from the plug-in board, and realizing the disassembly of the cotton pad, thereby improving the convenience of using the device.

[0015] The head positioning device of the children's vision testing instrument has a support plate that is convenient for placing the child's chin on the top of the support plate to achieve initial position fixation of the child's head, so that the screw rod moves longitudinally along the threaded path of the threaded sleeve, and the longitudinal extension length of the screw rod and the connecting rod is adjusted during the transmission process to adapt to the height requirement of the head positioning device, so as to prevent the different sizes of children's heads and reduce the detection accuracy of the vision testing instrument for children's vision. The limit plate is set to move along the inner cavity of the connecting rod to prevent the screw rod from detaching from the connecting rod, and the two limit blocks are set to move along the through grooves opened on the two sides of the connecting rod to prevent the limit plate and the connecting rod from relative rotation, thereby improving the structural stability of the device parts, and the bottom plate is set to provide support. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the support frame and the fixing block of the utility model;

[0019] Figure 3 It is a structural schematic diagram of the clamping plate of the utility model;

[0020] Figure 4 It is a structural schematic diagram of the screw rod and the connecting rod of the utility model.

[0021] Description of reference numerals:

[0022] In the figure: 1, support frame; 2, fixed block; 3, rotating rod; 4, threaded rod; 5, threaded block; 6, connecting plate; 7, clamping plate; 8, fixed plate; 9, plug-in plate; 10, limit rod; 11, cotton pad; 12, support rod; 13, support plate; 14, screw rod; 15, threaded sleeve; 16, push plate; 17, limit bearing; 18, connecting rod; 19, limit block; 20, limit plate; 21, bottom plate; 22, rotating block. DETAILED DESCRIPTION

[0023] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0024] Unless otherwise defined, the directions of up, down, left, right, front, back, inside and outside involved in this document are based on the directions of up, down, left, right, front, back, inside and outside in the figures shown in the present utility model, and are explained here together.

[0025] The connection method can be bonding, welding, bolt connection, etc., depending on actual needs.

[0026] In order to solve the problem that when the head positioning device of the children's vision testing instrument fixes the position of the child's head, the child's head is relatively fragile, which is very easy to cause head injury to the child and reduce the safety of the device. Figures 1 to 4 The structure of the device body is a support frame 1 and a support plate 13 for supporting the child's chin, so that the child's chin can be placed on the top surface of the support plate 13 to achieve the initial position fixation of the child's head, and then it is convenient for the detection head of the vision detection instrument to accurately detect the child's eyes. A support rod 12 is welded on the bottom surface of the support plate 13, and the set support rod 12 provides support for the support plate 13. A fixed block 2 is welded on the inner wall of the support frame 1, and the fixed block 2 is located in the middle of the inner wall of the support frame 1, so as to achieve the equalization and division of the internal space of the support frame 1 and fix the position of the fixed block 2. The side of the fixed block 2 is rotatably connected to the rotating rod 3 through the opened through groove. The set fixed block 2 fixes the rotation position of the rotating rod 3. Two threaded rods 4 with reverse threads are welded on both end surfaces of the rotating rod 3.

[0027] Through the connecting action of the rotating rod 3, it is convenient to make the two threaded rods 4 with reverse threads rotate synchronously. The threaded rod 4 is threadedly connected with a threaded block 5, so that the threaded block 5 can move laterally along the threaded path of the threaded rod 4, thereby realizing the synchronous reverse movement of the two threaded blocks 5. The top surface of the threaded block 5 is fixedly connected with an L-shaped connecting plate 6. The inner walls of the two connecting plates 6 are arranged centripetally. The connecting plates 6 provided at the same time provide support and connection. The end faces of the connecting plates 6 are welded with clamping plates 7 to fix the position of the clamping plates 7. The lateral spacing between the two clamping plates 7 is convenient to adjust during the transmission process, thereby facilitating the clamping and fixing of different children's heads, preventing children's heads from shaking, and reducing the detection accuracy of children's vision of the vision detection instrument. The two ends of the side of the clamping plate 7 are fixedly connected with U-shaped fixing plates 8, so that the two fixing plates 8 are fixed on the same side of the clamping plate 7.

[0028] At the same time, the two fixing plates 8 are located on the side of the clamping plate 7 away from the connecting plate 6. The inner wall of the fixing plate 8 is slidably connected with a plug-in plate 9. The fixed plate 8 is set to fix the longitudinal moving path of the plug-in plate 9. The adjacent sides of the two plug-in plates 9 are fixedly connected with cotton pads 11. The set cotton pads 11 provide a buffering and protective effect to prevent the child's head from being injured due to the fragility of the child's head when the child's head is clamped, thereby improving the safety of the head positioning device. The top surface of the plug-in plate 9 is connected to the limit rod 10 through the opened through groove. The set limit rod 10 further fixes the moving path of the plug-in plate 9, improves the structural stability of the device components, provides a buffering and protective effect for the child's head, and is convenient for removing the cotton pad 11 for cleaning, thereby improving the convenience of using the device. The bottom surface of the limit rod 10 is welded to the fixing plate 8.

[0029] The bottom surface of the support rod 12 is welded to the fixed block 2, and the side of the support frame 1 is rotatably connected with a rotating block 22 through an opened through groove. The end face of the rotating block 22 is welded to the threaded rod 4 on the left. The set rotating block 22 is convenient for rotating the threaded rod 4 from the outside of the support frame 1, thereby improving the convenience of using the device. The bottom surface of the fixed block 2 is fixedly connected with a screw rod 14, and the screw rod 14 is threadedly connected with a threaded sleeve 15, so that the screw rod 14 moves longitudinally along the threaded path of the threaded sleeve 15. Two push plates 16 are welded on the side of the threaded sleeve 15. The two push plates 16 are convenient for pushing the threaded sleeve 15 to rotate, thereby improving the convenience of using the device. The outer peripheral side of the threaded sleeve 15 is interference fit with a limit bearing 17, and the limit bearing 17 is set to fix the rotation position of the threaded sleeve 15, and the outer ring of the limit bearing 17 is embedded and fixedly connected with an internal hollow connecting rod 18 to achieve position fixation of the limit bearing 17.

[0030] At the same time, it is convenient to realize the relative rotation of the threaded sleeve 15 and the connecting rod 18. The top surface of the connecting rod 18 is in sliding friction contact with the two push plates 16. The two side surfaces of the connecting rod 18 are slidably connected to the limit blocks 19 through the opened through grooves, and the moving paths of the two limit blocks 19 are fixed. The limit plates 20 are welded on the adjacent sides of the two limit blocks 19 to realize the synchronous movement of the two limit blocks 19 and one limit plate 20. The set limit plate 20 prevents the screw rod 14 from separating from the connecting rod 18 during the movement. The two set limit blocks 19 prevent the limit plate 20 and the connecting rod 18 from relative rotation, thereby improving the structural stability of the device parts. The side surface of the limit plate 20 is slidably connected to the inner wall of the connecting rod 18, and the top surface of the limit plate 20 is fixedly connected to the screw rod 14. A bottom plate 21 is welded on the bottom surface of the connecting rod 18, and the set bottom plate 21 provides support.

[0031] The working principle, size and model are irrelevant to the function of this application, so they are not described in detail. The control method of the utility model is controlled by a controller, and the control circuit of the controller can be realized by simple programming by technicians in this field. The provision of power is also common knowledge in this field, and the utility model is mainly used to protect mechanical devices, so the utility model will no longer explain the control method and circuit connection in detail.

[0032] How it works

[0033] When using the head positioning device of the children's vision testing instrument, the user rotates the rotating block 22, and under the connection provided by the rotating rod 3, the two threaded rods 4 with reverse threads rotate synchronously, so that the threaded block 5 moves laterally along the thread path of the threaded rod 4, thereby realizing the reverse movement of the two threaded blocks 5. The provided connecting plate 6 provides support and connection, and the distance between the two clamping plates 7 is conveniently adjusted during the transmission process to adapt the heads of different children for clamping and fixing, thereby preventing the children's heads from shaking and deviating, and reducing the detection accuracy of the vision testing instrument for children. The provided cotton pad 11 provides a buffering and protective effect to prevent the children's heads from being injured due to the fragility of the children's heads when the heads are clamped, thereby improving the safety of the device.

[0034] The plug-in plate 9 is slidably connected along the inner wall of the fixed plate 8, and at the same time, the top surface of the plug-in plate 9 is plugged with the limit rod 10 through the through groove. The cotton pad 11 is convenient to remove for cleaning during the transmission process, thereby improving the convenience of using the device. The push plate 16 is pushed to make the screw rod 14 move longitudinally along the threaded path of the threaded sleeve 15, thereby driving the limit plate 20 to move along the inner cavity of the connecting rod 18. By adjusting the longitudinal extension length of the screw rod 14 and the connecting rod 18, the height requirements of children's use can be adapted. The two limit blocks 19 are set to prevent the limit plate 20 and the connecting rod 18 from relative rotation, thereby improving the structural stability of the device components. The limit bearing 17 is set to fix the rotation position of the threaded sleeve 15, thereby further improving the structural stability of the device components.

[0035] It should be noted that, in this article, relational terms such as one and two are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A head positioning device for a child vision testing instrument, comprising a support frame (1) and a support plate (13) for supporting a child's chin, characterized in that: A support rod (12) is welded to the bottom surface of the support plate (13); a fixed block (2) is welded to the inner wall of the support frame (1); the side of the fixed block (2) is rotatably connected to a rotating rod (3) via a through slot; two threaded rods (4) with reverse threads are welded to both end surfaces of the rotating rod (3); the threaded rod (4) is threadedly connected to a threaded block (5); The top surface of the threaded block (5) is fixedly connected to an L-shaped connecting plate (6), the end surface of the connecting plate (6) is welded to a clamping plate (7), the two ends of the side surfaces of the clamping plate (7) are fixedly connected to U-shaped fixing plates (8), the inner side wall of the fixing plate (8) is slidably connected to a plug-in plate (9), the adjacent sides of the two plug-in plates (9) are fixedly connected to cotton pads (11), the top surface of the plug-in plate (9) is plugged with a limiting rod (10) through a through groove, and the bottom surface of the limiting rod (10) is welded to the fixing plate (8).

2. The head positioning device of a child vision testing instrument according to claim 1, characterized in that: The bottom surface of the support rod (12) is welded to the fixed block (2), and the side surface of the support frame (1) is rotatably connected to a rotating block (22) via a through slot.

3. The head positioning device of a child vision testing instrument according to claim 2, characterized in that: The end surface of the rotating block (22) is welded to the threaded rod (4) on the left, and the bottom surface of the fixed block (2) is fixedly connected to a threaded rod (14).

4. The head positioning device of a child vision testing instrument according to claim 3, characterized in that: The screw rod (14) is threadedly connected to a threaded sleeve (15), and two push plates (16) are welded to the side of the threaded sleeve (15).

5. The head positioning device of a child vision testing instrument according to claim 4, characterized in that: The outer circumference of the threaded sleeve (15) is interference-fitted with a limit bearing (17), and an inner hollow connecting rod (18) is embedded and fixedly connected inside the outer ring of the limit bearing (17).

6. The head positioning device of a child vision testing instrument according to claim 5, characterized in that: The top surface of the connecting rod (18) is in sliding frictional contact with the two push plates (16), and the two side surfaces of the connecting rod (18) are slidably connected to the limiting block (19) via the through grooves provided therein.

7. The head positioning device of a child vision testing instrument according to claim 6, characterized in that: A limiting plate (20) is welded to adjacent sides of the two limiting blocks (19), and a side surface of the limiting plate (20) is slidably connected to an inner side wall of the connecting rod (18).

8. The head positioning device of a child vision testing instrument according to claim 7, characterized in that: The top surface of the limit plate (20) is fixedly connected to the screw rod (14), and the bottom surface of the connecting rod (18) is welded with a bottom plate (21).

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