Portable vision examination table

Abstract

The utility model discloses a portable vision examination table, which relates to the technical field of vision examination and comprises an examination table body, a first pulley and a second pulley, an upper rod is mounted above the examination table body, a lower rod is mounted below the examination table body, movable rods are movably mounted on the inner sides of the two ends of the upper rod and the lower rod, and the movable rods are connected with the first pulley and the second pulley. Second sliding grooves are formed in the inner walls of one ends of the movable rods correspondingly, and second sliding wheels are movably installed on the inner sides of the second sliding grooves correspondingly. A pull rod is pulled upwards to make a stop block move upwards, then movable rods on the two sides are pushed inwards to make the movable rods move towards the inner sides of an upper rod and a lower rod, meanwhile, a second pulley moves in a second sliding groove, the second pulley moves to make a connecting belt drive a check meter body to move towards the inner side at the same time to be vertically folded, then the lower rod is rotated, and the check meter is folded. And by reducing the size, the inspection meter is more convenient to carry and work, and the problems that the size is large and the inspection meter cannot be folded and stored are solved.

Description

Technical Field

[0001] This utility model relates to the field of vision testing technology, specifically a portable vision test chart. Background Technology

[0002] The primary function of a visual acuity chart is to check visual acuity. It is a common and basic examination in ophthalmology, suitable for measuring near and far visual acuity and screening for visual impairment in children over three years old, adolescents, and adults. A common visual acuity chart is the E-chart, which is 5 meters away. The chart has E-letters that open in all directions. The examiner stands at 5 meters away and looks at the optotypes on the chart from top to bottom to measure the degree of visual acuity. The chart has a simple structure but does not have a folding and storage structure, making it inconvenient to carry. In view of the above problems, this case was developed through in-depth research. Utility Model Content

[0003] The purpose of this invention is to provide a portable vision test chart to solve the problem mentioned in the background art that the existing portable vision test chart does not have a folding storage and positioning structure.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a portable vision test chart, comprising a test chart body, a first pulley and a second pulley, an upper rod installed above the test chart body, a lower rod installed below the test chart body, movable rods movably installed on the inner sides of both ends of the upper rod and the lower rod, a second sliding groove provided on the inner wall of one end of each movable rod, and a second pulley movably installed on the inner side of each second sliding groove.

[0005] Preferably, both sides of the top of the upper pole are connected to hanging ropes, and hanging rings are connected above the hanging ropes.

[0006] Preferably, the material of the checklist body is polyester fiber fabric, and the surface of the checklist body is uniformly provided with visual markers of decreasing size from top to bottom.

[0007] Preferably, both ends of the check sheet body are connected to connecting straps, and one end of each connecting strap is fixedly connected to a second pulley.

[0008] Preferably, the inner wall of the upper rod is provided with a first sliding groove, and the outer wall of one end of the movable rod is movably connected to the first sliding groove through a first pulley.

[0009] Preferably, a return spring is installed on the outer wall of both ends of the upper and lower rods, and a pull rod is movably installed on the inner side of each return spring, with a stop block connected to one end of each pull rod.

[0010] Preferably, the bottom ends of the movable rods on both sides of the lower rod are connected to a tensioning strap, and the bottom ends of the tensioning straps are connected to an elastic rubber ring. The bottom ends of the movable rods on one side of the elastic rubber ring are connected to a fixing buckle.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] (1) This utility model provides a pull rod, a movable rod and a tightening strap. By pulling the pull rod upward, the stop block is raised. Then, by pulling the movable rod outward, the pull rod is released and the return spring is reset, causing the stop block to be positioned downward against the first pulley. This positions the movable rod, making the support of the gauge body more flat. After the gauge body is folded and rolled up, the tightening strap wraps around the movable rod at one end of the upper and lower rods multiple times. After the tightening strap binds the movable rods together, the elastic rubber ring is fixed on the fixing buckle, thus achieving the tightening and positioning of the gauge body and solving the problem of not having a positioning structure.

[0013] (2) This utility model provides a pull rod, an upper rod, and a lower rod. By pulling the pull rod upward, the stop block moves upward. Then, the movable rods on both sides are pushed inward to move them to the inside of the upper and lower rods. At the same time, the second pulley moves in the second slide groove. The movement of the second pulley causes the connecting belt to move the gauge body inward at the same time for vertical folding. Then, the lower rod is rotated so that the gauge body is wrapped around the lower rod for storage. By reducing the volume, it is easier to carry and work, and the problems of large size and inability to be folded and stored are solved. Attached Figure Description

[0014] Figure 1 This is a front view structural diagram of the inspection table body of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the inspection table body after folding and winding.

[0016] Figure 3 This is a side view of the lower rod structure of this utility model;

[0017] Figure 4 This utility model Figure 1 Enlarged structural diagram at point A in the middle.

[0018] In the diagram: 1. Movable rod; 2. Hanging rope; 3. Upper rod; 4. Checker body; 5. Lower rod; 6. Connecting belt; 7. Fastening belt; 8. First slide groove; 9. First pulley; 10. Hanging ring; 11. Second slide groove; 12. Second pulley; 13. Fixing buckle; 14. Elastic rubber ring; 15. Stop block; 16. Return spring; 17. Pull rod. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1: Please refer to Figures 1-4 A portable vision test chart includes a test chart body 4, a first pulley 9 and a second pulley 12. An upper rod 3 is installed above the test chart body 4, and a lower rod 5 is installed below the test chart body 4. Movable rods 1 are movably installed on the inner sides of both ends of the upper rod 3 and the lower rod 5. A second groove 11 is provided on the inner wall of one end of each movable rod 1, and a second pulley 12 is movably installed on the inner side of each second groove 11.

[0021] Both sides of the top of the upper pole 3 are connected to hanging ropes 2, and hanging rings 10 are connected above the hanging ropes 2;

[0022] The material of the inspection table body 4 is set as polyester fiber fabric, and the surface of the inspection table body 4 is uniformly set with visual markers of decreasing size from top to bottom;

[0023] The two ends of the inspection table body 4 are connected to the connecting straps 6, and one end of each connecting strap 6 is fixedly connected to the second pulley 12.

[0024] The inner wall of the upper rod 3 is provided with a first sliding groove 8, and the outer wall of one end of the movable rod 1 is movably connected to the first sliding groove 8 through a first pulley 9;

[0025] Specifically, such as Figure 1 , Figure 3 and Figure 4 As shown, when using this structure, by pulling the lever 17 upward, the stop block 15 moves upward, and then the movable rods 1 on both sides are pushed inward to move them to the inside of the upper rod 3 and the lower rod 5. At the same time, the second pulley 12 moves in the second slide groove 11. The movement of the second pulley 12 causes the connecting belt 6 to move the gauge body 4 inward at the same time for vertical folding. Then, the lower rod 5 is rotated so that the gauge body 4 is rolled up on the lower rod 5 for storage. The reduction in size makes it easier to carry and work.

[0026] Example 2: A return spring 16 is installed on the outer wall of both ends of the upper rod 3 and the lower rod 5, and a pull rod 17 is movably installed on the inner side of the return spring 16. A stop block 15 is connected to one end of the pull rod 17.

[0027] The bottom ends of the movable rods 1 on both sides of the lower rod 5 are connected to a tension strap 7, and the bottom ends of the tension straps 7 are connected to an elastic rubber ring 14. The bottom ends of the movable rods 1 on one side of the elastic rubber ring 14 are connected to a fixing buckle 13.

[0028] Specifically, such as Figure 1 , Figure 2 and Figure 3 As shown, when using this structure, by pulling the lever 17 upward, the stop block 15 is raised, and then by pulling the movable rod 1 outward, the movable rod 1 is pulled out. After the movable rod 1 is pulled out, the lever 17 is released, and the return spring 16 returns to its original position, causing the stop block 15 to move downward and block the first pulley 9, thereby positioning the movable rod 1 and making the gauge body 4 more flat. After the gauge body 4 is folded and rolled up, the tightening strap 7 wraps around the movable rod 1 at one end of the upper rod 3 and the lower rod 5 multiple times. After the tightening strap 7 binds the movable rod 1 together, the elastic rubber ring 14 is fixed on the fixing buckle 13, thereby achieving the tightening and positioning of the gauge body 4.

[0029] Working principle: When using this device, first hang the hanging ring 10 on the nail on the wall and fix it. After the user is at a certain distance, conduct a vision test. The material of the main body 4 of the test chart is set as polyester fiber fabric. Polyester fiber is a synthetic fiber with excellent performance. It is soft, wrinkle-resistant, heat-resistant and not easily deformed. It is one of the common wrinkle-free and non-deformable fabrics on the market.

[0030] Implementation steps for the first innovation point:

[0031] Step 1: Pull the lever 17 upward to move the stop 15 upward, and then push the movable levers 1 on both sides inward to move them to the inside of the upper lever 3 and the lower lever 5;

[0032] Step 2: At the same time, the second pulley 12 moves within the second slide groove 11. The movement of the second pulley 12 causes the connecting belt 6 to move the check sheet body 4 inwards simultaneously for vertical folding.

[0033] Step 3: Then rotate the lower rod 5 so that the main body 4 of the check sheet is rolled up on the lower rod 5 and stored. The reduction in size makes it easier to carry and work.

[0034] Implementation steps for the second innovation point:

[0035] Step 1: Pull the lever 17 upward to make the stop 15 move upward, and then pull the movable rod 1 outward. After the movable rod 1 is pulled out, release the lever 17. The return spring 16 returns to its original position and makes the stop 15 move downward to block and position the first pulley 9, thereby positioning the position of the movable rod 1 and making the support of the gauge body 4 more level.

[0036] Step 2: After folding and rolling up the check sheet body 4, the tightening strap 7 wraps around the movable rod 1 at one end of the upper rod 3 and the lower rod 5 multiple times. After the tightening strap 7 binds the movable rod 1 tightly, the elastic rubber ring 14 is fixed on the fixing buckle 13 to achieve the tightening and positioning of the check sheet body 4.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A portable visual acuity chart comprising a chart body (4), a first pulley (9) and a second pulley (12), characterized in that: The upper rod (3) is installed above the checklist body (4), the lower rod (5) is installed below the checklist body (4), the inner side of both ends of the upper rod (3) and the lower rod (5) is movably installed with the movable rod (1), the inner wall of one end of the movable rod (1) is provided with the second sliding groove (11), and the inner side of the second sliding groove (11) is movably installed with the second pulley (12).

2. A portable vision testing chart according to claim 1, wherein: The upper rod (3) is installed above the checklist body (4), the lower rod (5) is installed below the checklist body (4), the inner side of both ends of the upper rod (3) and the lower rod (5) is movably installed with the movable rod (1), the inner wall of one end of the movable rod (1) is provided with the second sliding groove (11), and the inner side of the second sliding groove (11) is movably installed with the second pulley (12).

3. A portable vision testing chart according to claim 1, wherein: The material of the checklist body (4) is polyester fiber cloth, and the surface of the checklist body (4) is uniformly provided with size-decreasing visual marks from top to bottom.

4. A portable vision testing chart according to claim 1, wherein: The two sides of both ends of the checklist body (4) are connected with the connecting belt (6), and one end of the connecting belt (6) is fixedly connected with the second pulley (12).

5. A portable vision testing chart according to claim 1, wherein: The inner wall of the upper rod (3) is provided with the first sliding groove (8), and the outer wall of one end of the movable rod (1) is movably connected with the first sliding groove (8) through the first pulley (9).

6. A portable vision testing chart according to claim 1, wherein: The outer wall of both ends of the upper rod (3) and the lower rod (5) is installed with the reset spring (16), the inner side of the reset spring (16) is movably installed with the pull rod (17), and one end of the pull rod (17) is connected with the stop block (15).

7. A portable vision testing chart according to claim 1, wherein: The bottom end of the movable rod (1) on both sides of the lower rod (5) is connected with the tightening belt (7), the bottom end of the tightening belt (7) is connected with the elastic rubber ring (14), and the bottom end of the elastic rubber ring (14) on one side of the movable rod (1) is connected with the fixed buckle (13).

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