A lifting linkage assembly for a visual acuity chart projector

Abstract

The application discloses a lifting linkage assembly for a visual acuity chart projector and relates to the technical field of visual acuity chart projectors.The lifting linkage assembly comprises a lifting device and a projection device, a supporting plate is arranged below the projection device, a lifting end of the lifting device is slidably connected with a lifting plate, the left side surface of the lifting plate is fixedly connected with the right side surface of the supporting plate, two positioning plates are fixedly installed on the upper surface of the supporting plate, the left side surface of each positioning plate is in contact with the right side surface of the projection device, a sliding groove is formed in the left side surface of each positioning plate, a sliding block is slidably connected with the inner wall of each sliding groove, the horizontal section of the sliding block and the sliding groove is in the shape of a Chinese character 'kong', and the left side surface of each sliding block is fixedly connected with the right side surface of the projection device.The application does not need to use connecting bolts to install and fix the visual acuity chart projector, greatly increases the dismounting convenience of the visual acuity chart projector, and facilitates the maintenance work of the visual acuity chart projector by the staff.

Description

Technical Field

[0001] The present invention relates to the technical field of eye chart projectors, and in particular to a lifting linkage component for an eye chart projector. Background Art

[0002] The eye chart projector is a fully self-service smart device for vision testing. It not only provides convenience for the prevention and control of myopia in children and adolescents, but also solves the trouble of patients having to queue up for vision testing when seeking medical treatment. The operator is fully self-service throughout the process, and it has supporting software and management platforms, which greatly improves the efficiency of vision testing and reduces manpower input. In order to better conduct vision testing on people of different heights, a lifting structure is usually used to fix the eye chart projector, which makes it convenient to adjust the height of the eye chart projector as needed.

[0003] The connection between the existing eye chart projector and the lifting structure is usually fixed with bolts, which is very time-consuming and labor-intensive. When the eye chart projector needs to be repaired, it is not convenient to quickly disassemble the eye chart projector from the lifting structure, which affects the maintenance efficiency of the eye chart projector and makes it more difficult to disassemble and assemble the eye chart projector. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that the linkage assembly between the eye chart projector and the lifting device is difficult to disassemble and assemble, which affects the convenience of maintaining the eye chart projector, and to propose a lifting linkage assembly for the eye chart projector.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The lifting linkage assembly for a vision chart projector comprises a lifting device and a projection device, wherein a support plate is provided below the projection device, a lifting end of the lifting device is slidably connected to the lifting plate, the left side of the lifting plate is fixedly connected to the right side of the support plate, and two positioning plates are fixedly installed on the upper surface of the support plate, the left side of each positioning plate contacts the right side of the projection device, the left side of each positioning plate is provided with a sliding groove, the inner wall of each sliding groove is slidably connected to a sliding block, the horizontal cross-sections of the sliding block and the sliding groove are convex, the left side of each sliding block is fixedly connected to the right side of the projection device, the inner bottom wall of each sliding groove is fixedly installed with a compression spring, the top of each compression spring is fixedly installed with a pad, and the upper surface of each pad contacts the bottom surface of the sliding block;

[0007] Four positioning posts are fixedly installed on the bottom surface of the projection device, and an annular groove is provided in the middle of the outer surface of each positioning post. Four insertion holes are provided on the upper surface of the support plate, and the upper end of each insertion hole is horn-shaped. Four fixing cylinders are fixedly installed on the bottom surface of the support plate, and the upper end of each fixing cylinder is horn-shaped, and the inner wall of the intersection is arc-shaped. Each fixing cylinder is located below the insertion hole, and the bottom end of each positioning post passes through the insertion hole in sequence and extends to the interior of the fixing cylinder. An elastic spring is fixedly installed on the inner bottom wall of each fixing cylinder, and an iron ring is fixedly installed on the top of each elastic spring. A through hole with a diameter slightly larger than the positioning post is provided in the center of each iron ring, and three metal balls are placed above each iron ring. The diameter of each metal ball is larger than the through hole in the center of the iron ring, and every three metal balls are clamped in the inside of the annular groove.

[0008] Preferably, a pedal is fixedly mounted on the bottom surface of the lifting device, the horizontal cross-section of the pedal is convex-shaped, and four supporting legs are fixedly mounted on the bottom surface of the pedal.

[0009] Preferably, a reinforcement block is fixedly mounted on the upper surface of the pedal, the vertical cross-section of the reinforcement block is in the shape of a right-angled triangle, and the right side of the reinforcement block is fixedly connected to the left side of the lifting device.

[0010] Preferably, a soft pad is fixedly mounted on the upper surface of the pedal, and the upper surface of the soft pad is provided with anti-skid grooves arranged at equal distances in the horizontal direction, and the cross-section of each anti-skid groove is semicircular.

[0011] Preferably, an I-shaped plate is fixedly mounted on the right side of the lifting plate, and the right side of the I-shaped plate is in contact with the right side of the lifting device.

[0012] Preferably, a clamping frame is fixedly mounted on the front and back of the projection device, and a pull ring is movably hinged to the inside of each clamping frame via a pin.

[0013] Preferably, a reinforcement sleeve is fixedly installed on the outer surface of each positioning column, the upper surface of each reinforcement sleeve is fixedly connected to the bottom surface of the projection device, each reinforcement sleeve is clamped inside the insertion hole, and the cross-section of each reinforcement sleeve is funnel-shaped.

[0014] Preferably, a stabilizing plate is fixedly mounted on one side of the middle portions of the two positioning plates that are close to each other, and the left side of the stabilizing plate contacts the right side of the projection device.

[0015] Preferably, a telescopic rod is provided inside each compression spring, the bottom end of each telescopic rod is fixedly connected to the inner bottom wall of the sliding groove, and the telescopic end of each telescopic rod is fixedly connected to the bottom surface of the pad.

[0016] Preferably, a reinforcement ring is fixedly mounted on the outer surface of each of the fixing cylinders, and the upper surface of each of the reinforcement rings is fixedly connected to the bottom surface of the support plate.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The present invention is provided with a fixed cylinder and an elastic spring. When the projection device needs to be disassembled, four strong magnets need only be placed under the fixed cylinder. The magnetic force of the strong magnets can attract the iron ring downward and cause the elastic spring to contract. At this time, the metal ball is separated from the annular groove and can be pulled upward together with the projection device and the positioning column, thereby completing the disassembly of the projection device. The eye chart projection can be quickly removed from the lifting device, thereby increasing the convenience of eye chart projection maintenance.

[0019] 2. The present invention is provided with a positioning column, a support plate and an insertion hole. When the eye chart projector needs to be installed, the positioning column only needs to be inserted downward into the fixed tube through the insertion hole. The elastic force provided by the elastic spring can push the iron ring to move upward, and the metal ball can be pushed into the annular groove in conjunction with the conical shape inside the fixed tube, thereby clamping the positioning column and preventing it from moving upward, thereby completing the installation of the eye chart projector. This achieves the effect of not needing to use bolts for installation and fixation, effectively improving the convenience of installing the eye chart projector.

[0020] 3. The present invention is provided with a positioning plate that cooperates with the sliding block to slide inside the sliding groove, which can pre-fix the position and angle of the eye chart projector, so that the eye chart projector is not easily offset when it is clamped downward for installation, thereby ensuring the accuracy of the installation of the eye chart projector. In addition, the elastic force provided by the compression spring cooperates with the pad to provide an upward thrust to the sliding block, and then cooperates with the fixation of the positioning column to form a force angle, thereby increasing the firmness of the installation of the eye chart projector and playing a role in making the installation of the eye chart projector more firm and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a lifting linkage assembly for a vision chart projector proposed by the present invention;

[0022] Figure 2 This is a schematic diagram of the right side structure of a lifting device of a lifting linkage assembly for an eye chart projector proposed by the present invention;

[0023] Figure 3 This is a schematic diagram of the upward-looking structure of a projection device of a lifting linkage assembly for an eye chart projector proposed by the present invention;

[0024] Figure 4This is a schematic diagram of the support plate structure of a lifting linkage assembly for an eye chart projector proposed by the present invention;

[0025] Figure 5 This is a schematic structural diagram of a cross-section of a positioning plate in a lifting linkage assembly for an eye chart projector proposed by the present invention;

[0026] Figure 6 This is a structural schematic diagram of a fixed cylinder in a lifting linkage assembly for an eye chart projector proposed by the present invention;

[0027] Figure 7 This is a schematic structural diagram of a cross-section of a fixed cylinder in a lifting linkage assembly for an eye chart projector proposed by the present invention;

[0028] Figure 8 This is a schematic structural diagram of the upward-looking pedal in a lifting linkage assembly for an eye chart projector proposed by the present invention.

[0029] In the figure: 1. lifting device; 2. projection equipment; 3. support plate; 4. lifting plate; 5. positioning column; 6. annular groove; 7. positioning plate; 8. sliding groove; 9. sliding block; 10. compression spring; 11. pad; 12. insertion hole; 13. fixing cylinder; 14. elastic spring; 15. iron ring; 16. metal ball; 17. pedal; 18. supporting leg; 19. reinforcement block; 20. cushion; 21. anti-slip groove; 22. I-shaped plate; 23. clamping frame; 24. pull ring; 25. reinforcement sleeve; 26. stabilizing plate; 27. telescopic rod; 28. reinforcement ring. Implementation Method

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0032] Reference Figure 1-2A lifting linkage assembly for a vision chart projector includes a lifting device 1 and a projection device 2. A support plate 3 is provided below the projection device 2. The lifting end of the lifting device 1 is slidably connected to a lifting plate 4. The left side of the lifting plate 4 is fixedly connected to the right side of the support plate 3. In addition, a pedal 17 is fixedly installed on the bottom surface of the lifting device 1. At the same time, the horizontal cross-section of the pedal 17 is convex, and four supporting legs 18 are fixedly installed on the bottom surface of the pedal 17. The pedal 17 can facilitate people to stand in a designated position, thereby increasing the accuracy of vision detection. The support legs 18 can support and stabilize the device, making the placement of the device more stable and reliable.

[0033] Reference Figure 1-4 Two positioning plates 7 are fixedly installed on the upper surface of the support plate 3, and the left side of each positioning plate 7 is in contact with the right side of the projection device 2. A sliding groove 8 is opened on the left side of each positioning plate 7, and a sliding block 9 is slidably connected to the inner wall of each sliding groove 8. The horizontal cross-sections of the sliding block 9 and the sliding groove 8 are both convex. The left side of each sliding block 9 is fixedly connected to the right side of the projection device 2. In addition, a reinforcement block 19 is fixedly installed on the upper surface of the pedal 17. At the same time, the vertical cross-section of the reinforcement block 19 is in the shape of a right triangle, and the right side of the reinforcement block 19 is fixedly connected to the left side of the lifting device 1. The reinforcement block 19 can increase the connection firmness between the pedal 17 and the lifting device 1, so that the pedal 17 is not easy to bend with the lifting device 1, thereby increasing the service life of the pedal 17.

[0034] Reference Figure 1 、 2 and 5. A compression spring 10 is fixedly mounted on the inner bottom wall of each sliding groove 8, and a pad 11 is fixedly mounted on the top of each compression spring 10. The upper surface of each pad 11 contacts the bottom surface of the sliding block 9. The pad 11 can prevent the compression spring 10 from directly contacting the sliding block 9, thereby reducing the wear of the compression spring 10. In addition, a soft pad 20 is fixedly mounted on the upper surface of the pedal 17. At the same time, the upper surface of the soft pad 20 is provided with anti-slip grooves 21 arranged at equal distances in the horizontal direction, and the cross-section of each anti-slip groove 21 is semicircular. The soft pad 20 and the anti-slip groove 21 can increase the friction of the pedal 17, making it less likely for people to slide when standing on the pedal 17.

[0035] Reference Figure 2 、 3The bottom surface of the projection device 2 is fixedly provided with four positioning columns 5, the middle part of the outer surface of each positioning column 5 is provided with an annular groove 6, the upper surface of the supporting plate 3 is provided with four insertion holes 12, the upper end of each insertion hole 12 is in a trumpet shape, in addition, the right side surface of the lifting plate 4 is fixedly provided with a I-shaped plate 22, at the same time, the right side surface of the I-shaped plate 22 is in contact with the right side surface of the lifting device 1, the I-shaped plate 22 can limit the position of the lifting plate 4 and increase the pressure capacity of the lifting plate 4, so that the lifting plate 4 is not easy to bend, and the carrying capacity of the lifting plate 4 is increased.

[0036] With reference to Figure 3 , 4 The bottom surface of the supporting plate 3 is fixedly provided with four fixed cylinders 13, the upper end of each fixed cylinder 13 is in a trumpet shape, the inner wall of the intersection is in a circular arc shape, each fixed cylinder 13 is located below the insertion hole 12, the bottom end of each positioning column 5 penetrates the insertion hole 12 in sequence and extends to the inside of the fixed cylinder 13, in addition, the front surface and the back surface of the projection device 2 are fixedly provided with a clamping frame 23, at the same time, the inside of each clamping frame 23 is movably hinged with a pull ring 24 through a pin shaft, the pull ring 24 and the clamping frame 23 can be used to conveniently lift the projection device 2 upward by the staff, and the convenience of taking the projection device 2 is increased.

[0037] With reference to Figure 6 The outer surface of each positioning column 5 is fixedly provided with a reinforcing sleeve 25, the upper surface of each reinforcing sleeve 25 is fixedly connected with the bottom surface of the projection device 2, each reinforcing sleeve 25 is clamped in the inside of the insertion hole 12, the cross section of each reinforcing sleeve 25 is in a funnel shape, the reinforcing sleeve 25 can increase the connection strength of the positioning column 5 and the projection device 2, and make the positioning column 5 better inserted and fixed in the inside of the insertion hole 12, and the use effect of the positioning column 5 is ensured.

[0038] With reference to Figure 4 and 7 The inner bottom wall of each fixed cylinder 13 is fixedly provided with an elastic spring 14, the top end of each elastic spring 14 is fixedly provided with an iron ring 15, the center of each iron ring 15 is provided with a through hole with a diameter slightly larger than that of the positioning column 5, in addition, the side surface of the middle part of the two positioning plates 7 close to each other is commonly fixedly provided with a stable plate 26, at the same time, the left side surface of the stable plate 26 is in contact with the right side surface of the projection device 2, the stable plate 26 can increase the stability of the two positioning plates 7, so that the positioning plate 7 is not easy to shake and deviate, and the positioning plate 7 is more stable and reliable in use.

[0039] With reference to Figure 5 and 7Three metal balls 16 are placed above each iron ring 15. The diameter of each metal ball 16 is larger than the through hole in the center of the iron ring 15. Every three metal balls 16 are clamped in the inside of the annular groove 6. In addition, a telescopic rod 27 is provided inside each compression spring 10, and the bottom end of each telescopic rod 27 is fixedly connected to the inner bottom wall of the sliding groove 8. At the same time, the telescopic end of each telescopic rod 27 is fixedly connected to the bottom surface of the pad 11. The telescopic rod 27 can limit the telescopic direction of the compression spring 10, so that it can only be telescoped up and down, and is not prone to left and right deviation, thereby reducing the friction of the compression spring 10 on the sliding groove 8 and increasing the use effect of the compression spring 10.

[0040] Reference Figure 6 A reinforcement ring 28 is fixedly installed on the outer surface of each fixed tube 13, and the upper surface of each reinforcement ring 28 is fixedly connected to the bottom surface of the support plate 3. The reinforcement ring 28 can increase the connection strength between the fixed tube 13 and the support plate 3, making the connection between the fixed tube 13 and the support plate 3 more firm and reliable, thereby ensuring the service life of the fixed tube 13.

[0041] The specific working principle of the present invention is as follows:

[0042] When in use, one only needs to manually hold the pull ring 24 to lift the projection device 2, and then snap the sliding block 9 into the sliding groove 8. The sliding of the sliding block 9 in the sliding groove 8 can accurately locate the position and angle of the projection device 2, thereby ensuring the accuracy of subsequent installation of the projection device 2.

[0043] Then, by utilizing the gravity of the projection device 2 itself, it can slide downward until it contacts the support plate 3, so that the positioning post 5 is inserted into the fixing cylinder 13 through the insertion hole 12. When the positioning post 5 enters the fixing cylinder 13, it will first push the metal ball 16 and the iron ring 15 downward. When the positioning post 5 passes through the central through hole of the iron ring 15, the elastic force of the elastic spring 14 will push the iron ring 15 and the metal ball 16 upward, so that the metal ball 16 can be stuck in the annular groove 6. At this time, the positioning post 5 will not be able to move upward, thereby completing the fixing of the projection device 2. There is no need to use bolts for fixing and installation, making the lifting linkage of the projection device 2 and the lifting device 1 more convenient and quick, thereby ensuring the installation efficiency of the projection device 2.

[0044] The elastic force provided by the compression spring 10 cooperates with the pad 11 to provide an upward thrust for the sliding block 9, thereby cooperating with the positioning column 5 to fix the projection device 2, forming a force angle, thereby ensuring the firmness of the fixation of the projection device 2;

[0045] When the projection device 2 needs to be disassembled for maintenance, four strong magnets are placed under the fixing cylinder 13. The magnetic force generated by the strong magnets can attract the iron ring 15 downward and force the elastic spring 14 to contract, so that the metal ball 16 can be released from the annular groove 6. At this time, the positioning column 5 can be unlocked, and then the projection device 2 can be manually pulled up to complete the disassembly work, which greatly increases the disassembly efficiency of the projection device 2, ensures the rapid progress of the maintenance work, and also improves the lifting linkage effect between the projection device 2 and the lifting device 1.

[0046] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A lifting linkage assembly for an eye chart projector, comprising a lifting device (1) and a projection device (2), characterized in that: A support plate (3) is provided below the projection device (2), and the lifting end of the lifting device (1) is slidably connected to a lifting plate (4), the left side of the lifting plate (4) is fixedly connected to the right side of the support plate (3), and two positioning plates (7) are fixedly installed on the upper surface of the support plate (3), and the left side of each positioning plate (7) contacts the right side of the projection device (2), and the left side of each positioning plate (7) is provided with a sliding groove (8), and the inner wall of each sliding groove (8) is slidably connected to a sliding block (9), and the horizontal cross-sections of the sliding block (9) and the sliding groove (8) are convex, and the left side of each sliding block (9) is fixedly connected to the right side of the projection device (2), and the inner bottom wall of each sliding groove (8) is fixedly installed with a compression spring (10), and the top of each compression spring (10) is fixedly installed with a pad (11), and the upper surface of each pad (11) contacts the bottom surface of the sliding block (9); Four positioning columns (5) are fixedly installed on the bottom surface of the projection device (2), and an annular groove (6) is provided in the middle of the outer surface of each positioning column (5). Four insertion holes (12) are provided on the upper surface of the support plate (3), and the upper end of each insertion hole (12) is horn-shaped. Four fixed cylinders (13) are fixedly installed on the bottom surface of the support plate (3), and the upper end of each fixing cylinder (13) is horn-shaped, and the inner wall of the intersection is arc-shaped. Each fixing cylinder (13) is located below the insertion hole (12), and the bottom end of each positioning column (5) is sequentially Penetrating the insertion hole (12) and extending to the interior of the fixed cylinder (13), the inner bottom wall of each fixed cylinder (13) is fixedly mounted with an elastic spring (14), the top of each elastic spring (14) is fixedly mounted with an iron ring (15), the center of each iron ring (15) is provided with a through hole with a diameter slightly larger than that of the positioning column (5), three metal balls (16) are placed above each iron ring (15), the diameter of each metal ball (16) is larger than the through hole in the center of the iron ring (15), and each of the three metal balls (16) is clamped in the interior of the annular groove (6); A reinforcement sleeve (25) is fixedly mounted on the outer surface of each positioning column (5), the upper surface of each reinforcement sleeve (25) is fixedly connected to the bottom surface of the projection device (2), each reinforcement sleeve (25) is clamped inside the insertion hole (12), and the cross-section of each reinforcement sleeve (25) is funnel-shaped.

2. The lifting linkage assembly for a vision chart projector according to claim 1, characterized in that: A pedal (17) is fixedly mounted on the bottom surface of the lifting device (1), the horizontal cross-section of the pedal (17) is in a convex shape, and four supporting legs (18) are fixedly mounted on the bottom surface of the pedal (17).

3. The lifting linkage assembly for a vision chart projector according to claim 2, characterized in that: A reinforcing block (19) is fixedly mounted on the upper surface of the pedal (17), wherein the vertical cross-section of the reinforcing block (19) is in the shape of a right-angled triangle, and the right side of the reinforcing block (19) is fixedly connected to the left side of the lifting device (1).

4. The lifting linkage assembly for a vision chart projector according to claim 2, characterized in that: A soft pad (20) is fixedly mounted on the upper surface of the pedal (17), and anti-skid grooves (21) arranged at equal distances in the horizontal direction are formed on the upper surface of the soft pad (20), and the cross section of each anti-skid groove (21) is semicircular.

5. The lifting linkage assembly for a vision chart projector according to claim 1, characterized in that: An I-shaped plate (22) is fixedly mounted on the right side of the lifting plate (4), and the right side of the I-shaped plate (22) contacts the right side of the lifting device (1).

6. The lifting linkage assembly for a vision chart projector according to claim 1, characterized in that: A clamping frame (23) is fixedly mounted on the front and back of the projection device (2), and a pull ring (24) is movably hinged inside each clamping frame (23) via a pin.

7. The lifting linkage assembly for a vision chart projector according to claim 1, characterized in that: A stabilizing plate (26) is fixedly mounted on one side of the middle of the two positioning plates (7) that is close to each other, and the left side of the stabilizing plate (26) is in contact with the right side of the projection device (2).

8. The lifting linkage assembly for a vision chart projector according to claim 1, characterized in that: A telescopic rod (27) is provided inside each compression spring (10), the bottom end of each telescopic rod (27) is fixedly connected to the inner bottom wall of the sliding groove (8), and the telescopic end of each telescopic rod (27) is fixedly connected to the bottom surface of the pad (11).

9. The lifting linkage assembly for a vision chart projector according to claim 1, characterized in that: A reinforcement ring (28) is fixedly mounted on the outer surface of each fixed cylinder (13), and the upper surface of each reinforcement ring (28) is fixedly connected to the bottom surface of the support plate (3).

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