An automatic triggering mechanism for the headrest of a computer refractometer

Abstract

This utility model discloses an automatic triggering mechanism for a computer refractometer headrest, including a headrest and a chin rest; and further including: a lifting assembly, comprising a lifting column connected at its upper end to the chin rest, a lifting nut that slides and limits the movement of the lifting column, a lifting motor fixed at the lower end of the headrest, and a lifting screw whose lower end is connected to the output shaft of the lifting motor and whose upper end is threadedly connected to the lifting nut; and a detection assembly, comprising a fixed bracket mounted on the lifting nut, a detection switch fixed on the fixed bracket, and a trigger plate mounted at the lower end of the lifting column; wherein the lifting column and the lifting nut are slidably connected by a cylindrical pin, and an elastic reset device is provided between the lifting column and the lifting nut. This application has the effect of improving the detection efficiency of the computer refractometer.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an automatic triggering mechanism for the headrest of a computer optometry instrument. Background Technology

[0002] As a fundamental diagnostic tool in modern ophthalmology, the headrest mechanism of a computerized refractometer must balance patient comfort and testing accuracy. Currently, most computerized refractometers use manual or semi-automatic methods to adjust the headrest height, relying on the operator's experience to judge the subject's chin position, which is prone to human error leading to misalignment between the eyes and the optical center.

[0003] In related technologies, manual mechanical screw adjustment involves rotating a handle to drive the screw to rotate, thereby enabling the chin support mounted on the screw to move up and down.

[0004] Regarding the aforementioned technologies, manual adjustment is inefficient and requires frequent intervention from medical staff, prolonging the testing time and relying too much on the operator's experience. The inventor believes that current computer-controlled refractometers have the drawback of low testing efficiency. Summary of the Invention

[0005] To address the problem of low detection efficiency in such computerized refractometers, this application provides an automatic triggering mechanism for the headrest of a computerized refractometer.

[0006] The technical solution provided in this application adopts the following: an automatic triggering mechanism for a computer refractometer headrest, including a headrest and a chin rest; further comprising: The lifting assembly includes a lifting column whose upper end is connected to the chin support, a lifting nut that slides and limits the lifting column, a lifting motor fixed to the lower end of the head support, and a lifting screw whose lower end is connected to the output shaft of the lifting motor and whose upper end is threadedly connected to the lifting nut. The detection component includes a fixed bracket mounted on the lifting nut, a detection switch fixed on the fixed bracket, and a trigger plate mounted at the lower end of the lifting column; The lifting column and the lifting nut are slidably connected by a cylindrical pin, and an elastic reset device is provided between the lifting column and the lifting nut.

[0007] By employing the above technical solution, the automatic lifting and triggering function of the chin support is achieved through the synergistic action of the lifting and detection components. The headrest, serving as the main support structure, is connected to the chin support and supports the patient's head. The lifting component, driven by a lifting motor, rotates the lifting screw, which in turn drives the lifting nut to move up and down along the screw's axis, thereby raising and lowering the lifting column to adjust the height of the chin support. The detection component uses a fixed bracket to secure a detection switch. The trigger plate works in conjunction with the lifting column; when the lifting column moves to a preset position, the trigger plate activates the detection switch, enabling position detection and feedback. The lifting column and the lifting nut are slidably connected by a cylindrical pin, ensuring the stability of synchronous lifting among all components of the lifting component during the process. Simultaneously, an elastic reset device provides a reset force after the patient's chin disengages from the chin support, ensuring the reliability of the lifting component during reset. Through the coordinated operation of the overall structure, the automated detection of the computerized refractometer is improved, further enhancing detection efficiency and accuracy.

[0008] Optionally, a waist-shaped sliding groove is provided on the lower side wall of the lifting column, one end of the cylindrical pin is slidably limited in the waist-shaped sliding groove, and the other end of the cylindrical pin is fixed in the lifting nut.

[0009] By adopting the above technical solution, the lower side wall of the lifting column is provided with a waist-shaped sliding groove. The extension direction of this groove is consistent with the axis of the lifting column's vertical movement, and it is used to accommodate the sliding of the cylindrical pin. One end of the cylindrical pin is fixed inside the lifting nut, and the other end is embedded in the waist-shaped sliding groove, forming a sliding limiting structure. This structure allows the lifting column to move axially under the drive of the lifting nut, while limiting the radial offset of the lifting column through the waist-shaped groove, avoiding jamming or swaying of the lifting column due to uneven force, thereby improving the smoothness and accuracy of the lifting action.

[0010] Optionally, the elastic reset device includes an elastic column, a sliding column slidably sleeved on the outer wall of the elastic column, and an elastic element with one end abutting against the outer wall of the upper end face of the elastic column and the other end abutting against the inner wall of the upper end face of the sliding column; wherein the elastic column is also sleeved and fixed on the lifting nut; the upper outer wall of the sliding column is inserted and fixed in the lifting column, and on the other hand, the lower end of the lifting nut has a sliding hole at the fixed position of the elastic column, and the lower outer wall of the sliding column slides in the sliding hole.

[0011] The elastic repositioning device, employing the aforementioned technical solution, comprises an elastic column, a sliding column, and an elastic element. When the patient places their chin on the chin restoring bracket, the lifting column moves downward under pressure, compressing the sliding column and thus the elastic element. When the patient removes their chin from the chin restoring bracket, the elastic element is released, causing the sliding column to automatically slide upward, completing the repositioning process. A sliding hole is located at the lower end of the lifting nut, and the lower outer wall of the sliding column slides within this hole, ensuring stable axial movement of the sliding column and preventing lateral displacement.

[0012] Optionally, the fixed bracket is disposed at the lower end of the lifting nut, the lower end face of the elastic column abuts against the fixed bracket, and the fixed bracket is also provided with a mounting hole for the lifting screw to pass through and rotate.

[0013] By adopting the above technical solution, the fixed bracket is installed at the lower end of the lifting nut. While ensuring the stable installation of the detection component, it can also support the lower end face of the elastic column, ensuring the stability of the elastic reset device. At the same time, the fixed bracket is provided with a mounting hole for the lifting screw to pass through and rotate, which can integrate the elastic reset device with the driving structure of the lifting screw, reducing space occupation. The rigid connection of the fixed bracket enhances the torsional resistance of the overall structure, preventing the elastic column from shaking or tilting during the lifting process.

[0014] Optionally, the fixed bracket is provided with a limiting piece on the side away from the detection switch, and the head bracket is provided with a limiting plate on the inner wall located on the same side as the limiting piece, with a limiting protrusion integrally protruding on the limiting plate.

[0015] By adopting the above technical solution, when the lifting nut moves to its limit position, the limiting plate contacts the limiting protrusion, preventing further displacement and thus protecting the motor and transmission components from overload damage. This structure protects the lifting assembly through mechanical limiting, improving the safety of the lifting assembly.

[0016] Optionally, a protective sleeve is fitted on the outer wall of the upper end of the lifting column, and a positioning protrusion is integrally formed on the outer wall of the protective sleeve; a positioning groove is provided at the connection between the head bracket and the lifting column for fixing the positioning protrusion.

[0017] By adopting the above technical solution, the protective sleeve is fitted onto the outer wall of the upper end of the lifting column, which can reduce scratches on the surface of the lifting column during lifting and moving, and extend the service life of the lifting column. At the same time, the positioning protrusion on the outer wall of the protective sleeve cooperates with the positioning groove of the head bracket to ensure axial alignment and circumferential fixation between the lifting column and the head bracket, avoiding loosening of the connection due to vibration or external force, and indirectly improving assembly efficiency.

[0018] Optionally, a fixing hole is provided at the lower end of the lifting screw, the output shaft of the lifting motor is fixed in the fixing hole, and a bearing seat is also sleeved on the outer wall of the lower end of the lifting screw. A fixing groove is integrally provided on the inner wall of the head bracket at the end away from the lifting nut, and the bearing seat is also installed in the fixing groove.

[0019] By adopting the above technical solution, a fixing hole is provided at the lower end of the lifting screw, which is fixedly connected to the output shaft of the lifting motor by a key or interference fit, ensuring the reliability of power transmission. Furthermore, by sleeved a bearing seat on the outer wall of the lower end of the lifting screw, radial support is provided, reducing frictional resistance during rotation. This also enhances the axial rigidity and bending resistance of the lifting screw, preventing deformation or breakage due to excessive load.

[0020] Optionally, the head support is also integrally provided with a motor fixing plate at the lower end of the bearing seat, the lifting motor is fixed on the motor fixing plate, and the output shaft of the lifting motor passes through the motor fixing plate.

[0021] By adopting the above technical solution, the lifting motor can preferably be fixed to the motor mounting plate by bolts or clips. The motor mounting plate can distribute the weight and vibration of the lifting motor, reduce the local stress between the lifting motor and the head bracket, and improve the stability of the overall structure. The output shaft of the lifting motor passes through the motor mounting plate and connects to the lifting screw, ensuring the coaxial connection between the lifting motor and the lifting screw.

[0022] Optionally, the upper end of the head support is also provided with a head support rubber strip.

[0023] By adopting the above technical solution, the shape of the headrest rubber strip is adapted to the contour of the human eyebrow, which can distribute pressure and avoid local pressure caused by prolonged testing. In addition, the anti-slip properties of the rubber strip can prevent the patient's head from sliding, ensuring the stability of the headrest position during the testing process.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. Through the coordinated operation of the lifting component and the detection component, the automatic lifting and position triggering function of the headrest of the computer refractometer is realized, which improves the detection efficiency of the headrest structure of the computer refractometer. 2. The combination of the elastic reset device with the limit plate and limit plate enables the rapid reset of the lifting component and reduces the wear and tear of the lifting component during mechanical use, ensuring the accuracy and safety of the lifting action. 3. Optimizations to details such as the protective cover, positioning bumps, and headrest rubber strips not only provide better comfort for patients during testing but also adapt to the needs of patients of different body types and improve the durability of the equipment. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of an automatic triggering mechanism for the headrest of a computer refractometer, as described in an embodiment of this application.

[0026] Figure 2 This is a schematic diagram of the structure of an automatic trigger mechanism for the headrest of a computer refractometer, which involves removing part of the mounting box, according to an embodiment of this application.

[0027] Figure 3 This is a schematic diagram of the structure of an automatic trigger mechanism for removing the headrest and chin rest of a computer refractometer, as described in an embodiment of this application.

[0028] Figure 4 This is a schematic diagram of the structure of an automatic trigger mechanism for removing the headrest, chin rest, and lifting nut in a computer refractometer, according to an embodiment of this application. Figure 5 This is a top-view cross-sectional view of an automatic triggering mechanism for a computer refractometer headrest, as described in an embodiment of this application.

[0029] Explanation of reference numerals in the attached drawings: 1. Head support bracket; 2. Head support rubber strip; 3. Mounting box; 4. Chin support bracket; 5. Lifting assembly; 6. Detection assembly; 7. Lifting column; 8. Lifting nut; 9. Lifting screw; 10. Lifting motor; 11. Fixed bracket; 12. Detection switch; 13. Trigger plate; 14. Mounting hole; 15. Limiting plate; 16. Limiting plate; 17. Limiting protrusion; 18. Protective sleeve; 19. Positioning protrusion; 20. Positioning groove; 21. Waist-shaped sliding groove; 22. Cylindrical pin; 23. Elastic reset device; 24. Elastic column; 25. Sliding column; 26. Elastic element; 27. Sliding hole; 28. Fixed hole; 29. ​​Output shaft; 30. Bearing seat; 31. Fixed slot; 32. Motor fixing plate. Detailed Implementation

[0030] The present application will be further described in detail below with reference to the accompanying drawings.

[0031] This application discloses an automatic triggering mechanism for the headrest of a computer refractometer. (Refer to...) Figure 1 As shown, an automatic triggering mechanism for the headrest of a computer refractometer consists of a headrest 1 forming the main frame structure. The upper end of the headrest 1 is preferably arc-shaped to better fit the patient's head, and a headrest rubber strip 2 is installed at the arc-shaped position to improve the patient's comfort during the examination. On the other hand, the lower end of the headrest 1 is a mounting box 3 with an elliptical cross-section and a cylindrical shape. A chin support 4 is installed at the center of the headrest 1, and a lifting component 5 is connected and fixed at the lower end of the chin support 4. The main body of the lifting component 5 is fixed inside the mounting box 3.

[0032] Reference Figures 2 to 4As shown, a lifting component 5 and a detection component 6 are installed inside the mounting box 3 of the headrest 1. The automatic lifting and triggering function of the chin support 4 is realized through the coordinated operation of the lifting component 5 and the detection component 6.

[0033] The lifting assembly 5 includes a lifting column 7 connected to the chin support 4 at one end, a lifting nut 8 fixed to the bottom of the lifting column 7 and capable of relative sliding relative to the lifting column 7, a lifting screw 9 inserted into the lifting column 7 at one end and threadedly connected to the lifting nut 8, and a lifting motor 10 fixed to the other end of the lifting screw 9.

[0034] The detection component 6 includes a fixed bracket 11 located at the lower end of the lifting nut 8 and preferably fixed by bolts, a detection switch 12 fixed on one side of the fixed bracket 11, and a trigger plate 13 located at the lower end of the lifting column 7 and capable of sliding to trigger the detection switch 12. On the other hand, the fixed bracket 11 has a mounting hole 14 for the lifting screw 9 to pass through and rotate; and a limit plate 15 is integrally provided on the other side of the fixed bracket 11. A limit plate 16 is integrally provided on the inner wall of the mounting box 3 on the same side as the limit plate 15. Limit protrusions 17 are integrally provided at the upper and lower ends of the limit plate 16.

[0035] Reference Figures 3 to 5 As shown, the upper end of the lifting column 7 is preferably integrally fixed with the chin support 4, and a protective sleeve 18 is fitted on the outer wall of the upper end of the lifting column 7. A positioning protrusion 19 is integrally protruded on the outer wall of the protective sleeve 18. The upper end of the mounting box 3 of the head support 1 has a positioning groove 20 for the positioning protrusion 19 to be engaged and fixed. The lifting column 7 has a waist-shaped sliding groove 21 on the side wall of the lower end, and a cylindrical pin 22 is provided in the waist-shaped sliding groove 21. One end of the cylindrical pin 22 slides in the waist-shaped sliding groove 21, and the other end is fixed to the lifting nut 8. The cylindrical pin 22 realizes the sliding connection between the lifting column 7 and the lifting nut 8. An elastic reset device 23 is also provided between the lifting column 7 and the lifting nut 8.

[0036] The elastic reset device 23 is composed of an elastic column 24, a sliding column 25, and an elastic element 26. Preferably, the elastic column 24 has an inverted conical lower end and a cylindrical middle section, with the upper section larger than the middle cylindrical section. The lower end of the elastic column 24 is fitted and fixed inside the lifting nut 8, and its lower end face also abuts against the fixed bracket 11. A sliding hole 27 is provided at the lower end of the lifting nut 8 at the fixed position of the elastic column 24. The upper end of the sliding column 25 is inserted and fixed inside the lifting column 7, while the lower end of the sliding column 25 slides onto the elastic column 24 and also slides within the sliding hole 27. One end of the elastic element 26 abuts against the outer wall of the upper end face of the elastic column 24, and the other end abuts against the inner wall of the upper end face of the sliding column 25.

[0037] The lower end of the lifting nut 8 is threaded onto the lifting screw 9, and the upper end of the lifting nut 8 is also fitted onto the outer wall of the lifting column 7. A fixing hole 28 is provided at the lower end of the lifting screw 9, in which the output shaft 29 of the lifting motor 10 is interference-fitted and fixedly connected. A bearing seat 30 is also fitted onto the outer wall at the lower end of the lifting screw 9, and a fixing groove 31 is integrally provided on the inner wall of the mounting box 3 at the location of the bearing seat 30, with the bearing seat 30 being snapped and fixed within the fixing groove 31. A motor fixing plate 32 is also integrally provided on the inner wall at the lower end of the mounting box 3. The lifting motor 10 is preferably fixed to the motor fixing plate 32 by bolts, and the output shaft 29 of the lifting motor 10 passes through the motor fixing plate 32 and is interference-fitted with the lifting screw 9.

[0038] The implementation principle of the automatic triggering mechanism of the headrest of a computer-controlled refractometer in this application embodiment is as follows: When the refractometer needs to be used, the patient first places their chin on the chin rest 4 and presses their head firmly against the headrest rubber strip 2 at the upper end of the headrest 1. Then, the lifting column 7 will slide axially downward due to the weight of the patient's chin. At this time, the elastic reset device 23 at the bottom of the lifting column 7 will be compressed and deformed, causing the lifting nut 8 to contact the fixed bracket 11. Simultaneously, when the lifting column 7 moves downward, the trigger piece 13 installed at the bottom of the lifting column 7 will trigger the detection switch 12. The detection switch 12 will then promptly transmit the downward movement signal of the lifting column 7 to the refractometer control center. At this time, the refractometer control center will adjust the position of the lifting column 7 according to the patient's eyes and the instrument. The alignment is judged and the lifting motor 10 is activated. The lifting motor 10 then transmits the lifting signal to the lifting screw 9 through the output shaft 29. The lifting nut 8, which is threaded to the lifting screw 9, moves up and down relative to the lifting screw 9 to realize the up and down movement of the lifting column 7 and the chin support 4, thereby achieving accurate refraction operation for the patient's eyes. After the refraction operation is completed, the patient removes the chin from the chin support 4. At this time, the elastic reset device 23 will drive the lifting column 7 to move upward and reset due to the release of elastic potential energy. At this time, the trigger piece 13 will move upward with the lifting column 7 and disengage from the detection switch 12. The detection switch 12 will simultaneously transmit the reset signal of the lifting column 7 to the refraction instrument control center.

[0039] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application. In the description of this embodiment, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" 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 application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this application can be set in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of these features.

Claims

1. An automatic triggering mechanism for a computer refractometer headrest, comprising a headrest (1) and a chin rest (4); characterized in that: Also includes: The lifting assembly (5) includes a lifting column (7) whose upper end is connected to the chin support (4), a lifting nut (8) that slides and limits the lifting column (7), a lifting motor (10) fixed to the lower end of the head support (1), and a lifting screw (9) whose lower end is connected to the output shaft (29) of the lifting motor (10) and whose upper end is threadedly connected to the lifting nut (8). The detection component (6) includes a fixed bracket (11) mounted on the lifting nut (8), a detection switch (12) fixed on the fixed bracket (11), and a trigger piece (13) mounted on the lower end of the lifting column (7); The lifting column (7) and the lifting nut (8) are slidably connected by a cylindrical pin (22), and an elastic reset device (23) is provided between the lifting column (7) and the lifting nut (8).

2. The automatic triggering mechanism for the headrest of a computer refractometer according to claim 1, characterized in that: The lower side wall of the lifting column (7) is provided with a waist-shaped sliding groove (21), one end of the cylindrical pin (22) is slidably limited in the waist-shaped sliding groove (21), and the other end of the cylindrical pin (22) is fixed in the lifting nut (8).

3. The automatic triggering mechanism for the headrest of a computer refractometer according to claim 2, characterized in that: The elastic reset device (23) includes an elastic column (24), a sliding column (25) slidably sleeved on the outer wall of the elastic column (24), and an elastic element (26) with one end abutting against the outer wall of the upper end face of the elastic column (24) and the other end abutting against the inner wall of the upper end face of the sliding column (25); wherein the elastic column (24) is also sleeved and fixed on the lifting nut (8); the upper outer wall of the sliding column (25) is inserted and fixed in the lifting column (7), and on the other hand, the lower end of the lifting nut (8) has a sliding hole (27) at the fixed position of the elastic column (24), and the lower outer wall of the sliding column (25) slides in the sliding hole (27).

4. The automatic triggering mechanism for the headrest of a computer refractometer according to claim 3, characterized in that: The fixed bracket (11) is located at the lower end of the lifting nut (8), and the lower end face of the elastic column (24) abuts against the fixed bracket (11). The fixed bracket (11) is also provided with a mounting hole (14) through which the lifting screw (9) passes and rotates.

5. The automatic triggering mechanism for the headrest of a computer refractometer according to claim 3, characterized in that: The fixed bracket (11) is provided with a limiting piece (15) on the side away from the detection switch (12), and the head bracket (1) is provided with a limiting plate (16) on the inner wall located on the same side as the limiting piece (15), and a limiting protrusion (17) is integrally protruded on the limiting plate (16).

6. The automatic triggering mechanism for the headrest of a computer refractometer according to claim 1, characterized in that: A protective sleeve (18) is fitted on the outer wall of the upper end of the lifting column (7), and a positioning protrusion (19) is integrally protruded on the outer wall of the protective sleeve (18); a positioning groove (20) for fixing the positioning protrusion (19) is provided at the connection between the head bracket (1) and the lifting column (7).

7. The automatic triggering mechanism for the headrest of a computer refractometer according to claim 1, characterized in that: The lower end of the lifting screw (9) is provided with a fixing hole (28), the output shaft (29) of the lifting motor (10) is fixed in the fixing hole (28), and a bearing seat (30) is also sleeved on the outer wall of the lower end of the lifting screw (9). The head bracket (1) is integrally provided with a fixing groove (31) on the inner wall of the end away from the lifting nut (8), and the bearing seat (30) is also installed in the fixing groove (31).

8. The automatic triggering mechanism for the headrest of a computer refractometer according to claim 7, characterized in that: The head bracket (1) is also integrally provided with a motor fixing plate (32) at the lower end of the bearing seat (30). The lifting motor (10) is fixed on the motor fixing plate (32), and the output shaft (29) of the lifting motor (10) passes through the motor fixing plate (32).

9. The automatic triggering mechanism for the headrest of a computer refractometer according to claim 7, characterized in that: The upper end of the head support (1) is also provided with a head support rubber strip (2).

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