Ruler

Abstract

The utility model relates to a ruler which comprises a plurality of ruler sections, in every two adjacent ruler sections, one ruler section is provided with a connecting part, the other ruler section is provided with a matching part, the connecting part is connected with the matching part and is provided with a first connecting position and a second connecting position relative to the matching part, at the first connecting position, every two adjacent ruler sections are in butt joint at a first angle, and at the second connecting position, every two adjacent ruler sections are in butt joint at a second angle. At the second connecting position, the two adjacent ruler sections are in butt joint at a second angle, and the first angle is different from the second angle. According to the technical scheme, the ruler provided by the utility model is more comprehensive in function, wider in application range, capable of effectively improving user experience, simple in overall structure and convenient to install and operate.

Description

Technical Field

[0001] The present disclosure relates to the technical field of stationery, and in particular, to a ruler. Background Art

[0002] In the related art, a ruler as a basic measuring tool is usually used to measure linear dimensions such as length or width, or can also be used to draw straight lines. However, in actual application scenarios, it cannot be used for angle measurement or angle line drawing, for example, and has certain limitations. Utility Model Content

[0003] The purpose of the present disclosure is to provide a ruler which has more comprehensive functions, a wider range of applications, can effectively improve user experience, and has a simple overall structure for easy installation and operation.

[0004] In order to achieve the above-mentioned purpose, the present disclosure provides a ruler, comprising multiple sections, among which one of two adjacent sections is provided with a connecting portion, and the other section is provided with a matching portion, the connecting portion is connected to the matching portion and has a first connecting position and a second connecting position relative to the matching portion, in the first connecting position, the two adjacent sections are butt-jointed at a first angle, in the second connecting position, the two adjacent sections are butt-jointed at a second angle, and the first angle is different from the second angle.

[0005] Optionally, each section of the scale segment includes a first line-drawing surface and a second line-drawing surface that are opposite to each other with respect to the extension direction of the scale segment. In the first connection position, among two adjacent sections of the scale segment, the first line-drawing surface of one section of the scale segment is butted with the first line-drawing surface of the other section of the scale segment at the first angle. In the second connection position, among two adjacent sections of the scale segment, the first line-drawing surface of one section of the scale segment is butted with the second line-drawing surface of the other section of the scale segment at the second angle.

[0006] Optionally, two adjacent segments are connected to form a group of segments, and the second angles at which segments in different groups are butted are different, and the first angles at which segments in different groups are butted are the same.

[0007] Optionally, the first angle is 180°, and the second angle is greater than 0° and less than 180°.

[0008] Optionally, in two adjacent sections of the scale segment, one section of the scale segment has a first docking surface, and the other section of the scale segment has a first matching surface, the connecting portion is arranged on the first docking surface, and the matching portion is arranged on the first matching surface, in the first connection position, the first docking surface is connected to the first matching surface, and in the second connection position, the first docking surface is rotated 180° and then connected to the first matching surface, and the angle between the first docking surface or the first matching surface and the extension direction of the respective sections of the scale segment is equal to half of the second angle of the docking of the two adjacent sections of the scale segment.

[0009] Optionally, the connecting portion includes a mounting hole provided on the first mating surface, and the matching portion includes a rotating shaft provided on the first matching surface and interference fit with the mounting hole, so that the first mating surface is rotatably connected with the first matching surface.

[0010] Optionally, a limiting groove is formed inwardly on the inner side wall of the mounting hole, and a limiting protrusion matching the corresponding limiting groove is provided on the outer side wall of the rotating shaft to limit the rotating shaft in the corresponding mounting hole and enable the first docking surface to rotate relative to the first matching surface.

[0011] Optionally, there are multiple limiting protrusions, which are arranged at equal intervals around the central axis of the rotating shaft; and / or the rotating shaft is a nylon rotating shaft.

[0012] Optionally, the connecting portion also includes a connecting boss arranged on the first docking surface, the mounting hole is formed in the connecting boss, and the mating portion also includes a countersunk groove arranged on the first mating surface, the rotating shaft is formed in the countersunk groove, and when the rotating shaft and the mounting hole are interference fit, the connecting boss and the countersunk groove are interference fit.

[0013] Optionally, the connecting part includes a plug-in structure arranged on the first docking surface, and the mating part includes a plug-in mating structure arranged on the first mating surface, and the plug-in structure and the plug-in mating structure cooperate to make the first docking surface and the first mating surface plug-in connected; and / or the connecting part and the mating part are magnetically connected.

[0014] Optionally, the ruler is provided with scale markings and / or angle markings.

[0015] Through the above technical solution, that is, the ruler provided by the present disclosure, by providing a connecting portion on one of the two adjacent segments of the multiple segments of the ruler, and providing a matching portion on the other segment, the multiple segments can be spliced ​​and connected by connecting the connecting portion with the matching portion, and the structure is simple and easy to install and operate; in addition, the connecting portion is connected to the matching portion and has a first connection position and a second connection position relative to the matching portion, so that the two adjacent segments can be adaptively docked at a first angle or a second angle according to the user's use requirements, so that the ruler can be spliced ​​into rulers of different shapes according to the user's use requirements, making the ruler more comprehensive in function, wider in scope of application, and can better improve the user experience. Therefore, the ruler provided by the present disclosure has more comprehensive functions, wider in scope of application, can effectively improve the user experience, and the overall structure is simple and easy to install and operate.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0018] Figure 1 is a schematic structural diagram of a ruler provided in a first embodiment of the present disclosure;

[0019] Figure 2 is a schematic structural diagram of another angle of the ruler provided in the first embodiment of the present disclosure;

[0020] Figure 3 is a schematic structural diagram of a connecting portion provided in a first embodiment of the present disclosure;

[0021] Figure 4 is a structural schematic diagram of a matching portion provided in a first embodiment of the present disclosure;

[0022] Figure 5 is a structural schematic diagram of a connecting portion provided in a second embodiment of the present disclosure;

[0023] Figure 6 is a structural schematic diagram of a matching portion provided in a second embodiment of the present disclosure;

[0024] Figure 7 is a schematic structural diagram of a ruler provided in a second embodiment of the present disclosure;

[0025] Figure 8 is a schematic structural diagram of another angle of the ruler provided in the second embodiment of the present disclosure;

[0026] Fig. 9is a schematic structural diagram of a ruler provided in a third embodiment of the present disclosure;

[0027] Fig.10 is a schematic structural diagram of a ruler provided in a fourth embodiment of the present disclosure;

[0028] Fig.11 It is a schematic diagram of the structure of a ruler provided in the fifth embodiment of the present disclosure.

[0029] Description of Reference Numerals

[0030] 1-segment; 110-first line drawing surface; 120-second line drawing surface; 130-first docking surface; 140-first matching surface; 2-connecting portion; 210-mounting hole; 211-limiting groove; 220-connecting boss; 230-plug-in structure; 231-plug-in block; 232-plug-in hole; 3-matching portion; 310-rotating shaft; 311-limiting protrusion; 320-sunk groove; 330-plug-in matching structure; 331-slot; 332-plug-in shaft; 4-scale mark; 5-angle mark. DETAILED DESCRIPTION

[0031] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0032] In the present disclosure, unless otherwise stated, "inside" and "outside" refer to the inside and outside relative to the outline of the component or structure itself. In addition, it should be noted that the terms used, such as "first" and "second", are used to distinguish one element from another element and do not have order and importance. In addition, in the description with reference to the drawings, the same mark in different drawings represents the same element.

[0033] According to a ruler provided by the present disclosure, reference Figures 1 to 11 As shown, the ruler includes multiple ruler segments 1. Among two adjacent ruler segments 1, one ruler segment 1 is provided with a connecting portion 2, and the other ruler segment 1 is provided with a matching portion 3. The connecting portion 2 is connected to the matching portion 3 and has a first connecting position and a second connecting position relative to the matching portion 3. In the first connecting position, the two adjacent ruler segments 1 are butt-jointed at a first angle, and in the second connecting position, the two adjacent ruler segments 1 are butt-jointed at a second angle, and the first angle is different from the second angle.

[0034] Through the above technical solution, that is, the ruler provided by the present disclosure, by providing a connecting portion 2 on one of the two adjacent segments 1 of the multiple segments 1 of the ruler, and providing a matching portion 3 on the other segment 1, the multiple segments 1 can be spliced ​​and connected by connecting the connecting portion 2 with the matching portion 3, and the structure is simple and easy to install and operate; in addition, the connecting portion 2 is connected to the matching portion 3 and has a first connection position and a second connection position relative to the matching portion 3, so that the two adjacent segments 1 can be adaptively connected at a first angle or a second angle according to the user's use requirements, so that the ruler can be spliced ​​into rulers of different shapes according to the user's use requirements, for example, it can be spliced ​​into Figure 1 The ruler shown in the figure can be used to draw a straight line, for example, or the user can splice the ruler into a Figures 7 to 11 The angle rulers of different shapes are shown to realize the operation of drawing angle lines, for example, so that the ruler has more comprehensive functions, a wider range of applications, and can better improve the user experience. Therefore, the ruler provided by the present disclosure has more comprehensive functions, a wider range of applications, can effectively improve the user experience, and the overall structure is simple and easy to install and operate.

[0035] In some embodiments, reference Figures 1 to 11 As shown, each ruler segment 1 may include a first line drawing surface 110 and a second line drawing surface 120 that are opposite to each other in the extension direction of the ruler segment 1. In the first connection position, in two adjacent ruler segments 1, the first line drawing surface 110 of one ruler segment 1 is butted with the first line drawing surface 110 of the other ruler segment 1 at a first angle. In the second connection position, in two adjacent ruler segments 1, the first line drawing surface 110 of one ruler segment 1 is butted with the second line drawing surface 120 of the other ruler segment 1 at a second angle, so that the user can adaptively splice the ruler into, for example, Figure 1 Alternatively, the rulers may be joined together to form a Figures 7 to 11 The angle rulers of different shapes shown have a simple structure and are easy to install and operate, which is conducive to improving user experience.

[0036] In addition, in some embodiments, reference Figures 1 to 11 As shown, two adjacent ruler segments 1 are connected to form a group of ruler segments 1, and the second angles of the ruler segments 1 of different groups are different, and the first angles of the ruler segments 1 of different groups are the same, so that the user can adaptively splice the ruler into different shapes according to usage requirements.

[0037] For example, Figure 1 As shown, the first angle may be 180°, so that the ruler can be spliced ​​into a shape such as Figure 1 In addition, the second angle may be greater than 0° and less than 180°, for example, Figures 7 to 11As shown, the multiple segments 1 can be exemplarily arranged into five segments, wherein any two adjacent segments 1 in the five segments 1 are connected to form a group of segments 1, that is, Figures 7 to 11 The ruler can include, for example, four sets of ruler segments 1, which can be connected at different second angles. For example, the second angles can be 30°, 60°, 90°, and 120°, respectively. In this way, the user can adaptably splice the ruler into, for example, Figures 7 to 11 The different shapes of angle rulers shown, namely, Figure 7 The 30° angle scale shown in Fig. 9 The 60° angle scale shown, Fig.10 The 90° angle scale shown in Fig.11 A 120° angle ruler is shown in the figure to realize the operation of drawing angle lines at different angles, so that the ruler has more comprehensive functions and a wider range of applications, and can better improve the user experience.

[0038] Of course, it should be noted that the above-mentioned specific embodiment of the multi-section segment 1 with five sections is exemplary, and those skilled in the art can adaptively design the specific number of sections of the multi-section segment 1 according to actual application requirements, such as two sections, three sections, four sections or more sections, etc., and the present disclosure does not make specific limitations on this.

[0039] In addition, the above-mentioned specific embodiments in which the second angle is, for example, 30°, 60°, 90° or 120° are also exemplary. Those skilled in the art can adaptively adjust the specific angle size of the second angle according to actual application requirements. The purpose is to ensure that the second angle is greater than 0° and less than 180°. The present disclosure does not make any specific limitations on this.

[0040] In some embodiments, reference Figures 1 to 11 As shown, among two adjacent scale segments 1, one of the scale segments 1 may have a first docking surface 130, and the other scale segment 1 may have a first mating surface 140. The connecting portion 2 is arranged on the first docking surface 130, and the mating portion 3 is arranged on the first mating surface 140. In the first connection position, the first docking surface 130 is docked with the first mating surface 140. In the second connection position, the first docking surface 130 is rotated 180° and docked with the first mating surface 140. The angle between the first docking surface 130 or the first mating surface 140 and the extension direction of the respective scale segments 1 is equal to half of the second angle of the docking of the two adjacent scale segments 1, so that the user can adaptively splice the scale into, for example, Figure 1 Alternatively, the rulers may be joined together to form a Figures 7 to 11 The angle rulers of different angle shapes shown make the ruler more comprehensive in function and applicable to a wider range, thus better improving the user experience.

[0041] The connecting portion 2 and the matching portion 3 can be constructed in any suitable manner according to actual application requirements. For example, in some embodiments, Figure 3 and Figure 4 As shown, the connecting portion 2 may include a mounting hole 210 provided on the first mating surface 130, and the mating portion 3 includes a rotating shaft 310 provided on the first mating surface 140 and having an interference fit with the mounting hole 210, so that the first mating surface 130 is rotatably connected with the first mating surface 140. In this way, even if the user does not need to disassemble the ruler segment 1 provided with the first mating surface 130, for example, the ruler segment 1 provided with the first mating surface 140 can be directly bent to rotate, for example, 180° relative to the ruler segment 1 provided with the first mating surface 140. Figure 1 The ruler shown in the figure is adjusted to, for example, Figures 7 to 11 The angle rulers of different angle shapes shown are easy to operate. In addition, since the rotating shaft 310 is in interference fit with the mounting hole 210, it is helpful to ensure that the connection of the multi-section ruler segments 1 has a high connection reliability, and it is helpful to ensure that the ruler shape can be stably maintained in the adjusted state, thereby improving user experience and comfort.

[0042] in, Figure 3 and Figure 4 The specific structure of the connecting portion 2 and the matching portion 3 of a group of two adjacent segments 1 in the multi-segment segment 1 is only shown as an example. The specific structure of the connecting portion 2 and the matching portion 3 of other groups of two adjacent segments 1 can be adaptively designed and manufactured according to the same structure, and the present disclosure will not repeat them here. In addition, Figure 3 and Figure 4 Only the external structure of the first docking surface 130 and the first matching surface 140 of a group of two adjacent scale segments 1 in the multi-segment scale segments 1 is shown by way of example. Other groups, such as the second docking surface and the second matching surface, the third docking surface and the third matching surface, etc., can be designed and manufactured according to the same design concept as mentioned above. The purpose is to ensure that the angle between the corresponding docking surface or matching surface and the extension direction of the respective scale segments 1 is equal to half of the second angle of docking between the two adjacent scale segments 1, so as to realize the shape of the scale segments 1 being spliced ​​into different angles.

[0043] In addition, in some embodiments, reference Figure 3 and Figure 4 As shown, the inner wall of the mounting hole 210 may be concave inward to form a limiting groove 211, and the outer wall of the rotating shaft 310 may be provided with a limiting protrusion 311 that cooperates with the corresponding limiting groove 211, so as to limit the rotating shaft 310 in the corresponding mounting hole 210 and enable the first docking surface 130 to rotate relative to the first mating surface 140, thereby improving the reliability of the connection between the rotating shaft 310 and the mounting hole 210 and enhancing the user experience and comfort of use.

[0044] Optionally, in some embodiments, reference Figure 3 and Figure 4 As shown, the number of the limiting protrusions 311 can be multiple and arranged at equal intervals around the central axis of the rotating shaft 310, further improving the reliability of the connection between the rotating shaft 310 and the mounting hole 210. The present disclosure does not specifically limit the specific structure of the limiting protrusions 311 and the limiting grooves 211, and the specific arrangement number of the limiting protrusions 311, and those skilled in the art can design adaptively according to actual application requirements.

[0045] In addition, in some embodiments, the shaft 310 may be a nylon shaft 310, thereby increasing the service life of the shaft 310. Of course, the shaft 310 is not limited to the nylon material. For example, in other embodiments, the shaft 310 may also be made of materials such as stainless steel or aluminum. This disclosure does not specifically limit this, and those skilled in the art may design it adaptively according to actual application requirements.

[0046] In addition, the rotating shaft 310 and the mounting hole 210 may be provided with a magnetic connection, for example, on the basis of the interference fit, so as to better improve the reliability of the connection between the rotating shaft 310 and the mounting hole 210. Alternatively, the first docking surface 130 and the first mating surface 140 may be configured as a magnetic connection, for example, but the present disclosure is not limited thereto.

[0047] In some embodiments, reference Figure 3 and Figure 4 As shown, the connecting portion 2 may further include a connecting boss 220 disposed on the first mating surface 130, in which the above-mentioned mounting hole 210 is formed, and the mating portion 3 may further include a recessed groove 320 disposed on the first mating surface 140, in which the above-mentioned rotating shaft 310 is formed, and when the rotating shaft 310 and the mounting hole 210 are interference fit, the connecting boss 220 and the recessed groove 320 are interference fit, so as to better improve the reliability of the connection between the rotating shaft 310 and the mounting hole 210, which is beneficial to ensure that the connection between the multi-section ruler segments 1 has a higher connection reliability, and is beneficial to ensure that the ruler shape can be stably maintained in the adjusted state, thereby improving user experience and comfort.

[0048] In order to facilitate installation and manufacturing, in some embodiments, reference Figure 3 and Figure 4 As shown, the outer contour of the connecting boss 220 and the sink groove 320 can be constructed as, for example, a circle. Of course, it is not limited to this. Those skilled in the art can also make adaptive adjustments according to actual application requirements. For example, the outer contour of the connecting boss 220 and the sink groove 320 can also be other polygonal shapes such as a rectangle or a triangle. The present disclosure does not make specific limitations on this.

[0049] In other embodiments, reference Figure 5 and Figure 6 As shown, the connecting portion 2 can also be constructed to include a plug-in structure 230 disposed on the first mating surface 130, and the mating portion 3 includes a plug-in mating structure 330 disposed on the first mating surface 140. The plug-in structure 230 and the plug-in mating structure 330 cooperate to make the first mating surface 130 and the first mating surface 140 plug-in connected. In this way, when the user needs to connect, for example Figure 1 The ruler shown in the figure is adjusted to, for example, Figures 7 to 11 When using angle rulers of different angle shapes as shown, it is convenient to adaptively remove the ruler segment 1 with the first docking surface 130, for example, and then rotate it by 180°, for example, and then plug and connect it with the ruler segment 1 with the first matching surface 140, so as to complete the adjustment of the ruler shape, which is convenient for installation operation.

[0050] The plug-in structure 230 and the plug-in mating structure 330 may be constructed in any suitable manner, for example, Figure 5 and Figure 6 As exemplarily shown in the figure, the plug-in structure 230 may include an insert block 231 arranged on the first docking surface 130, and the plug-in mating structure 330 may include a slot 331 arranged on the first mating surface 140. The connection between two adjacent scale segments 1 is achieved through the plug-in mating between the insert block 231 and the slot 331, with high reliability.

[0051] In addition, in order to improve the connection reliability between the plug block 231 and the slot 331, those skilled in the art may also adaptively set a plug hole 232 in the plug block 231 and set a plug shaft 332 in the slot 331. In this way, when the plug block 231 is plugged into the slot 331, the connection reliability between the plug block 231 and the slot 331 may be further improved through the interference fit between the plug hole 232 and the plug shaft 332. In addition, the outer wall of the plug shaft 332 may also be provided with the above-mentioned limiting protrusion 311, and the plug hole 232 may be provided with the above-mentioned limiting groove 211 matched with the limiting protrusion 311, so as to improve the connection reliability between the plug block 231 and the slot 331. The specific structure has been described above, and the present disclosure will not repeat it here.

[0052] In addition, the connecting portion 2 and the matching portion 3 may also be connected by, for example, magnetic attraction, so as to better improve the connection reliability of the connection between the multiple scale segments 1.

[0053] Among them, it should be noted that the specific structure of the above-mentioned connecting part 2 and the matching part 3 is not limited to the specific embodiments provided by the above-mentioned present disclosure. Those skilled in the art can adaptively design the specific structure of the connecting part 2 and the matching part 3 according to actual application requirements. The purpose is to ensure that the connection between the multi-section scale segments 1 is stably connected through the connecting part 2 and the matching part 3. The present disclosure does not make specific limitations on this.

[0054] In addition, the connection part 2 and the matching part 3 and the corresponding scale segment 1 can be formed by, for example, integral molding or assembly connection. The present disclosure does not specifically limit such deformation methods, and the purpose is to ensure that the connection part 2 and the matching part 3 are stably arranged on the corresponding scale segment 1. The present disclosure is not limited to this.

[0055] In addition, the present disclosure does not specifically limit the specific appearance structure of the multi-section ruler segment 1. Those skilled in the art can design the ruler segment 1 into, for example, Figures 1 to 11 The ruler segment 1 may be designed as a rectangular block as shown in the figure, or the ruler segment 1 may be designed as a cylindrical shape not shown in the figure. The present disclosure is not limited thereto.

[0056] In some embodiments, reference Figures 1 to 11 As shown, the ruler can be provided with scale marks 4 and / or angle marks 5 to assist the user in drawing straight lines or angle lines, for example, and to facilitate the measurement of straight line lengths or angle sizes, etc., so that the ruler has more comprehensive functions and a wider range of applications, and can better improve the user experience.

[0057] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0058] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0059] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A ruler, characterized in that: It comprises a plurality of scale segments, wherein one of the two adjacent scale segments is provided with a connecting portion, and the other scale segment is provided with a matching portion, wherein the connecting portion is connected to the matching portion and has a first connecting position and a second connecting position relative to the matching portion, wherein at the first connecting position, the two adjacent scale segments are butted at a first angle, and at the second connecting position, the two adjacent scale segments are butted at a second angle, and the first angle is different from the second angle.

2. The ruler according to claim 1, characterized in that: Each section of the scale segment includes a first line-drawing surface and a second line-drawing surface that are opposite to each other with respect to the extension direction of the scale segment. In the first connection position, the first line-drawing surface of one of the two adjacent sections of the scale segment is butted against the first line-drawing surface of the other section of the scale segment at the first angle. In the second connection position, the first line-drawing surface of one of the two adjacent sections of the scale segment is butted against the second line-drawing surface of the other section of the scale segment at the second angle.

3. The ruler according to claim 1, characterized in that: Two adjacent segments are connected to form a group of segments, and the second angles of segments in different groups are different, and the first angles of segments in different groups are the same.

4. The ruler according to any one of claims 1 to 3, characterized in that: The first angle is 180°, and the second angle is greater than 0° and less than 180°.

5. The ruler according to claim 1, characterized in that: In two adjacent sections of the scale segments, one of the sections has a first docking surface, and the other section of the scale segment has a first matching surface. The connecting portion is arranged on the first docking surface, and the matching portion is arranged on the first matching surface. In the first connection position, the first docking surface is connected to the first matching surface. In the second connection position, the first docking surface is rotated 180° and then connected to the first matching surface. The angle between the first docking surface or the first matching surface and the extension direction of the respective sections is equal to half of the second angle of the docking of the two adjacent sections of the scale segments.

6. The ruler according to claim 5, characterized in that: The connecting portion includes a mounting hole arranged on the first mating surface, and the matching portion includes a rotating shaft arranged on the first matching surface and interference-fitted with the mounting hole, so that the first mating surface is rotatably connected with the first matching surface.

7. The ruler according to claim 6, characterized in that: The inner wall of the mounting hole is concavely formed with a limiting groove, and the outer wall of the rotating shaft is provided with a limiting protrusion that matches the corresponding limiting groove to limit the rotating shaft in the corresponding mounting hole and enable the first docking surface to rotate relative to the first matching surface.

8. The ruler according to claim 7, characterized in that: The number of the limiting protrusions is multiple and they are arranged at equal intervals around the central axis of the rotating shaft; and / or The rotating shaft is a nylon rotating shaft.

9. The ruler according to claim 6, characterized in that: The connecting portion also includes a connecting boss arranged on the first docking surface, the mounting hole is formed in the connecting boss, and the mating portion also includes a recessed groove arranged on the first mating surface, the rotating shaft is formed in the recessed groove, and when the rotating shaft and the mounting hole are interference fit, the connecting boss and the recessed groove are interference fit.

10. The ruler according to claim 5, characterized in that: The connecting portion includes a plug-in structure provided on the first mating surface, and the matching portion includes a plug-in matching structure provided on the first matching surface, wherein the plug-in structure and the plug-in matching structure match each other so that the first mating surface is plug-in connected with the first matching surface; and / or The connecting portion is magnetically connected to the matching portion.

11. The ruler according to claim 1, characterized in that: The ruler is provided with scale marks and / or angle marks.

Images