A rotating distance measuring ruler

Abstract

This utility model relates to the field of myopia prevention and control technology, and in particular to a rotating distance measuring ruler, including a main ruler, a fist ruler, a measuring ruler, a support shaft, two positioning blocks, a measuring locking component, a placement locking component, a first scale line, a second scale line, and a third scale line. The main ruler has a mounting hole, and the fist ruler and the measuring ruler both have round holes and limiting grooves. The round holes communicate with the limiting grooves. The support shaft is fixedly connected to the mounting hole, and both ends of the support shaft pass through the corresponding round holes. Both ends of the support shaft are fixedly connected to the corresponding positioning blocks, and the positioning blocks are placed in the corresponding limiting grooves. This method solves the technical problem in the existing myopia prevention and control measures for primary and secondary school students, which rely solely on visual estimation to determine whether the viewing distance is healthy, resulting in poor accuracy and difficulty in effectively preventing and controlling the occurrence of myopia in primary and secondary school students.

Description

Technical Field

[0001] This utility model relates to the field of myopia prevention and control technology, and in particular to a rotating distance measuring ruler. Background Technology

[0002] Myopia is a refractive eye condition. When the eye is in a relaxed state, parallel light rays entering the eye should focus precisely on the retina to form a clear image. However, in myopic individuals, the light rays focus in front of the retina, preventing a clear image from forming. Myopia has become a major public health challenge seriously affecting the eye health of the Chinese population, especially teenagers. The occurrence and progression of myopia are closely related to viewing distance and duration of screen time. Therefore, effectively managing viewing distance and screen time is crucial in myopia prevention and control for primary and secondary school students.

[0003] In existing technologies, myopia prevention and control measures for primary and secondary school students rely solely on visual assessment to determine whether the viewing distance is healthy. This method is inaccurate and cannot effectively prevent and control the occurrence of myopia among primary and secondary school students. Utility Model Content

[0004] The purpose of this invention is to provide a rotating distance measuring ruler, which aims to solve the technical problem in the existing myopia prevention and control measures for primary and secondary school students that rely solely on visual estimation to determine whether the viewing distance is healthy, which has poor accuracy and makes it difficult to effectively prevent and control the occurrence of myopia in primary and secondary school students.

[0005] To achieve the above objectives, this utility model employs a rotating distance measuring ruler, comprising a main ruler, a fist ruler, a measuring rod, a support shaft, two positioning blocks, a measuring locking assembly, a placement locking assembly, a first scale line, a second scale line, and a third scale line. The main ruler has a mounting hole, and the fist ruler and the measuring rod each have a circular hole and a limiting groove. The circular hole communicates with the limiting groove. The support shaft is fixedly connected to the mounting hole, and both ends of the support shaft pass through the corresponding circular holes. Both ends of the support shaft are fixedly connected to the corresponding positioning blocks, and the positioning blocks are placed in the corresponding limiting grooves. The measuring locking assembly is used to lock the fist ruler and the measuring rod when measuring. The placement locking assembly is used to lock the fist ruler and the measuring rod when not measuring. The first scale line, the second scale line, and the third scale line are respectively set on the main ruler, the fist ruler, and the measuring rod.

[0006] The sides of the two positioning blocks away from the support axis are respectively on the same plane as the sides of the fist ruler and the inch ruler away from the main ruler.

[0007] The rotating rangefinder also includes a marking section, and the main scale has a hanging hole with an anti-slip ring installed inside the hanging hole.

[0008] The marking section is located on the main scale.

[0009] The measuring locking assembly includes two measuring locking elastic elements. Both the main scale and the measuring ruler are provided with measuring locking grooves. Both measuring locking elastic elements are connected to the main scale, and the two measuring locking grooves are adapted to the two measuring locking elastic elements.

[0010] The placement locking assembly includes two placement locking elastic elements. Both the main ruler and the measuring ruler are provided with placement locking grooves. Both placement locking elastic elements are connected to the main ruler, and the two placement locking grooves are adapted to the two placement locking elastic elements.

[0011] The main ruler is 33cm long, and the distance from the end of the ruler to the center point of the support shaft is 3.3cm.

[0012] This utility model discloses a rotating distance measuring ruler. In practical use, it measures whether the distance between a primary and secondary school student's eyes and a book is within a healthy range by using the first scale line on the main ruler. By rotating the ruler, the circular hole on the ruler rotates on the outer wall of the support shaft, and the limiting groove on the ruler rotates on the outer wall of the corresponding positioning block, causing the end of the ruler to extend beyond the main ruler. The ruler is then locked and positioned by the measuring locking assembly. Combined with the second scale line, it measures whether the distance between the student's chest and the table is within a healthy range. By rotating the ruler... The circular hole on the ruler rotates on the outer wall of the support shaft, and the limiting groove on the ruler rotates on the outer wall of the corresponding positioning block, so that the end of the ruler extends out of the main ruler, and the ruler is locked and positioned by the measuring locking assembly. Combined with the third scale line, the distance between the fingers of primary and secondary school students holding the pen and the pen tip is measured to see if it is within a healthy distance. In this way, the technical problem of the existing myopia prevention and control measures for primary and secondary school students, which rely solely on visual inspection to judge whether the viewing distance is healthy, is poorly accurate and difficult to effectively prevent and control the occurrence of myopia in primary and secondary school students is solved. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the rotating distance measuring ruler of this utility model.

[0015] Figure 2 This is the front view of the rotating distance measuring ruler of this utility model.

[0016] Figure 3 This is the utility model Figure 2 A cross-sectional view of the AA line structure.

[0017] Figure 4 This is the utility model Figure 3 Enlarged view of the local structure at point B.

[0018] 101-Main scale, 102-Fist ruler, 103-Inch ruler, 104-Support shaft, 105-Positioning block, 106-First scale line, 107-Second scale line, 108-Third scale line, 109-Mounting hole, 110-Round hole, 111-Limiting groove, 112-Marking part, 113-Hanging hole, 114-Anti-slip ring, 115-Measuring locking elastic element, 116-Measuring locking groove, 117-Placement locking elastic element, 118-Placement locking groove. Detailed Implementation

[0019] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0020] Please see Figures 1-4 ,in Figure 1 This is a schematic diagram of the rotating distance measuring ruler of this utility model. Figure 2 This is the front view of the rotating distance measuring ruler of this utility model. Figure 3 This is the utility model Figure 2 A cross-sectional view of the AA line structure. Figure 4 This is the utility model Figure 3 Enlarged view of the local structure at point B.

[0021] This utility model provides a rotating distance measuring ruler, including a main scale 101, a fist ruler 102, a measuring ruler 103, a support shaft 104, two positioning blocks 105, a measuring locking assembly, a placement locking assembly, a first scale line 106, a second scale line 107, and a third scale line 108. The main scale 101 has a mounting hole 109. The fist ruler 102 and the measuring ruler 103 each have a circular hole 110 and a limiting groove 111. The circular hole 110 communicates with the limiting groove 111. The support shaft 104 is fixedly connected to the mounting hole 109, and both ends of the support shaft 104 pass through the corresponding circular holes 110. Both ends of the support shaft 104 are fixedly connected to the corresponding positioning blocks 105. The positioning blocks 105 are placed in the corresponding limiting grooves 111. The measuring locking assembly is used to lock the fist ruler 102 and the inch ruler 103 when measuring. The placement locking assembly is used to lock the fist ruler 102 and the inch ruler 103 when not measuring. The first scale line 106, the second scale line 107 and the third scale line 108 are respectively set on the main ruler 101, the fist ruler 102 and the inch ruler 103.

[0022] The main ruler 101 is 33cm long, and the distance from the end of the ruler 103 to the center point of the support shaft 104 is 3.3cm.

[0023] In this specific embodiment, during actual use, the distance between the eyes of primary and secondary school students and the book is measured using the first scale line 106 on the main ruler 101 to determine if it is within a healthy distance. By rotating the fist ruler 102, the circular hole 110 on the fist ruler 102 rotates on the outer wall of the support shaft 104, and the limiting groove 111 on the fist ruler 102 rotates on the outer wall of the corresponding positioning block 105, causing the end of the fist ruler 102 to extend out of the main ruler 101. The fist ruler 102 is then locked and positioned by the measuring locking assembly. Combined with the second scale line 107, the distance between the chest of primary and secondary school students and the table is measured to determine if it is within a healthy distance. This is achieved by rotating the measuring ruler. 103, the circular hole 110 on the ruler 103 rotates on the outer wall of the support shaft 104, and the limiting groove 111 on the ruler 103 rotates on the outer wall of the corresponding positioning block 105, so that the end of the ruler 103 extends out of the main ruler 101, and the ruler 103 is locked and positioned by the measuring locking assembly. Combined with the third scale line 108, the distance between the fingers of primary and secondary school students holding the pen and the pen tip is measured to see if it is within a healthy distance. In this way, the technical problem of the existing myopia prevention and control measures for primary and secondary school students, which rely solely on visual inspection to judge whether the viewing distance is healthy, is poorly accurate and difficult to effectively prevent and control the occurrence of myopia in primary and secondary school students.

[0024] Among them, the sides of the two positioning blocks 105 away from the support shaft 104 are respectively on the same plane as the sides of the fist ruler 102 and the inch ruler 103 away from the main ruler 101.

[0025] In this specific embodiment, this method ensures that the two positioning blocks 105 do not protrude from the fist ruler 102 and the inch ruler 103, making them more convenient to use.

[0026] Secondly, the rotating rangefinder also includes a marking part 112, and the main scale 101 also has a hanging hole 113, in which an anti-slip ring 114 is installed.

[0027] The marking part 112 is disposed on the main scale 101.

[0028] In this specific embodiment, the hanging hole 113 facilitates the hanging of the main ruler 101 in a designated position for storage when no measurement is being performed, thereby placing the entire rotating distance measuring ruler in the designated position. The anti-slip ring 114 is used to prevent slippage between the hanging ring and the placement point.

[0029] Meanwhile, the measuring locking assembly includes two measuring locking elastic elements 115. The main scale 101 and the measuring scale 103 are both provided with measuring locking grooves 116. The two measuring locking elastic elements 115 are connected to the main scale 101, and the two measuring locking grooves 116 are adapted to the two measuring locking elastic elements 115.

[0030] In this specific embodiment, when measuring, rotating the main ruler 101 and the measuring tape 103 will first compress the corresponding measuring locking elastic element 115 to deform. After rotating to the designated position, the measuring locking elastic element 115 will reset and be placed in the corresponding measuring locking groove 116, thereby locking and positioning the main ruler 101 and the measuring tape 103.

[0031] In addition, the placement locking assembly includes two placement locking elastic members 117. The main ruler 101 and the measuring ruler 103 are both provided with placement locking grooves 118. The two placement locking elastic members 117 are connected to the main ruler 101, and the two placement locking grooves 118 are adapted to the two placement locking elastic members 117.

[0032] In this specific embodiment, when no measurement is being performed, rotating the main ruler 101 and the measuring ruler 103 causes the two measuring locking slots 116 to separate from the two measuring locking elastic members 115. As rotation continues, the main ruler 101 and the measuring ruler 103 deform the two placement locking elastic members 117. Once the two placement locking slots 118 are aligned with the two placement locking elastic members 117, the two placement locking elastic members 117 reset and are placed back into their corresponding placement locking slots 118, thus locking and positioning the main ruler 101 and the measuring ruler 103. This prevents the measuring ruler 102 and the measuring ruler 103 from swinging freely, thereby reducing the space occupied during placement.

[0033] Using the rotating distance measuring ruler of this utility model, in specific use, the distance between the eyes of primary and secondary school students and the book is measured through the first scale line 106 on the main ruler 101 to determine whether it is a healthy distance. By rotating the fist ruler 102, the circular hole 110 on the fist ruler 102 rotates on the outer wall of the support shaft 104, and the limiting groove 111 on the fist ruler 102 rotates on the outer wall of the corresponding positioning block 105, so that the end of the fist ruler 102 extends out of the main ruler 101, and the fist ruler 102 is locked and positioned by the measuring locking assembly. Combined with the second scale line 107, the distance between the chest of primary and secondary school students and the table is measured to determine whether it is a healthy distance. The ruler 103 has a circular hole 110 that rotates on the outer wall of the support shaft 104, and a limiting groove 111 on the ruler 103 that rotates on the outer wall of the corresponding positioning block 105, so that the end of the ruler 103 extends out of the main ruler 101. The ruler 103 is locked and positioned by the measuring locking assembly. Combined with the third scale line 108, the distance between the fingers of primary and secondary school students holding a pen and the pen tip is measured to see if it is within a healthy distance. This method solves the technical problem in the existing myopia prevention and control measures for primary and secondary school students that rely solely on visual inspection to determine whether the viewing distance is healthy, which has poor accuracy and makes it difficult to effectively prevent and control the occurrence of myopia in primary and secondary school students.

[0034] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A rotating distance measuring ruler, characterized in that, The device includes a main scale, a fist ruler, a measuring tape, a support shaft, two positioning blocks, a measuring locking assembly, a placement locking assembly, a first scale line, a second scale line, and a third scale line. The main scale has a mounting hole. The fist ruler and the measuring tape each have a round hole and a limiting groove. The round hole communicates with the limiting groove. The support shaft is fixedly connected to the mounting hole. Both ends of the support shaft pass through the corresponding round holes. Both ends of the support shaft are fixedly connected to the corresponding positioning blocks. The positioning blocks are placed in the corresponding limiting grooves. The measuring locking assembly is used to lock the fist ruler and the measuring tape when measuring. The placement locking assembly is used to lock the fist ruler and the measuring tape when not measuring. The first scale line, the second scale line, and the third scale line are respectively set on the main scale, the fist ruler, and the measuring tape.

2. The rotating distance measuring ruler as described in claim 1, characterized in that, The sides of the two positioning blocks away from the support axis are respectively on the same plane as the sides of the fist ruler and the inch ruler away from the main ruler.

3. The rotating distance measuring ruler as described in claim 2, characterized in that, The rotating rangefinder also includes a marking section, and the main scale also has a hanging hole, in which an anti-slip ring is installed; The marking section is located on the main scale.

4. The rotating distance measuring ruler as described in claim 3, characterized in that, The measuring locking assembly includes two measuring locking elastic elements. Both the main scale and the measuring ruler are provided with measuring locking grooves. Both measuring locking elastic elements are connected to the main scale, and the two measuring locking grooves are adapted to the two measuring locking elastic elements.

5. The rotating distance measuring ruler as described in claim 4, characterized in that, The placement locking assembly includes two placement locking elastic elements. Both the main scale and the measuring scale are provided with placement locking grooves. Both placement locking elastic elements are connected to the main scale, and the two placement locking grooves are adapted to the two placement locking elastic elements.

6. The rotating distance measuring ruler as described in claim 5, characterized in that, The main ruler is 33cm long, and the distance from the end of the ruler to the center point of the support shaft is 3.3cm.

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