Compasses

Abstract

According to the compasses, the first supporting leg of the compasses is sleeved with the protective sleeve in the sliding mode, the protective sleeve comprises the sliding sleeve part and the protective part, the protective sleeve can stably slide relative to the first supporting leg through the sliding sleeve part, and the protective part can be switched between the protective position and the working position by sliding the protective sleeve; the multifunctional drawing tool is simple in overall structure, convenient and fast to operate, simple and attractive.

Description

TECHNICAL FIELD

[0001] The utility model relates to stationery field, especially a compass. BACKGROUND

[0002] The compass is a commonly used tool for learning and drawing geometric figures, which is simple in structure and convenient to operate. It is mainly composed of two rotatable metal legs, the end of one leg is a sharp needle for fixing on paper as the center of the circle, and the end of the other leg can be equipped with a lead core or an ink pen for drawing a circular line. In the use process, the radius of the circle is determined by adjusting the opening angle between the two legs. The design principle of this compass is based on the geometric definition of the circle, that is, all points are equal in distance from the center of the circle.

[0003] The needle of the existing compass is usually fixed on the leg, and this design has many safety hazards in the use process, especially in the student group. If the compass is accidentally dropped, the sharp needle may be exposed, causing accidental injury. For example, when a student draws a circle with a compass, if the compass accidentally slips, the sharp needle may prick the hand or other body parts, causing accidental injury. In addition, the long-term exposure of the needle is also prone to bending or breaking due to bumping, affecting the normal use of the compass. Therefore, how to improve the design of the compass needle so that it can be automatically hidden or effectively protected when not in use to improve the safety and operability of the compass has become a problem to be solved.

[0004] In the prior art, the above problem is usually solved by setting a protective cap to hide the needle, for example, a compass with a protective cap disclosed in patent publication No. CN220281008U. The utility model discloses a compass with a protective cap, which comprises a compass base, a first leg and a second leg, the first leg and the second leg are both rotationally connected with the compass base, the bottom end of the first leg is provided with a positioning needle, the bottom end of the second leg is provided with a drawing pen, and the protective cap is slidably connected with the first leg, the protective cap is provided with a first elastic lock, the first leg is provided with a first lock position matched with the first elastic lock, when the first elastic lock is buckled with the first lock position, the protective cap is positioned on the first leg, and the protective cap exposes the positioning needle; the second leg is provided with an unlocking block matched with the first lock position, the unlocking block enters the first lock position by being attached with the first leg and the second leg, when the unlocking block is buckled with the first lock position, the first elastic lock is separated from the first lock position, so that the protective cap can be slidably hidden to hide the positioning needle.

[0005] In actual use, the internal structure of the protective cap is relatively complex, and long-term use is prone to failure. The unlocking operation is relatively cumbersome. UTILITY MODEL CONTENTS

[0006] To this end, a compass needs to be provided to solve the problem that the internal structure of the protective cap of the existing compass with a protective cap is relatively complex, and long-term use is prone to failure, and the unlocking operation is relatively cumbersome.

[0007] To achieve the above object, the utility model provides a compass, including compass seat, first support, second support and protective sleeve, the top of first support and the top of second support are connected with the compass seat rotation respectively, the bottom of first support and the bottom of second support are equipped with tip or drawing part respectively;

[0008] The protective sleeve includes a sliding sleeve part and a protective part, the sliding sleeve part is sleeved on the first support, the protective part extends from the side of the sliding sleeve part close to the second support to the bottom of the first support, a positioning block and a limiting block are arranged on the side of the first support close to the second support, and an upper clamping block and a lower clamping block are arranged on the inner side of the protective part from top to bottom; the protective sleeve is switched between the working position and the protection position by sliding; when the protective sleeve is in the working position, the lower clamping block abuts on the upper surface of the positioning block, and the tip or drawing part protrudes out of the protective part; when the protective sleeve is in the protection position, the upper clamping block abuts on the lower surface of the positioning block, the lower clamping block abuts on the upper surface of the limiting block, and the tip or drawing part is received in the protective part.

[0009] Further, a sliding strip is arranged on the inner side of the protective part, a first sliding groove is arranged on the first support, and a second sliding groove is arranged on the second support, when the protective sleeve is in the protection position, the two groups of sliding strips are respectively slid into the first sliding groove and the second sliding groove, the movement direction of the sliding strips is limited by the first sliding groove and the second sliding groove, and the first support and the second support are locked.

[0010] Further, the top end of the sliding strip on the side close to the second support extends transversely to form a blocking strip.

[0011] Further, a first structure plate is arranged on the side of the first support close to the second support, a second structure plate is arranged on the side of the second support close to the first support, the positioning block, the limiting block and the first sliding groove are arranged on the first structure plate, and the second sliding groove is arranged on the second structure plate.

[0012] Further, the surface of the protective part is located in the same plane as the surfaces of the first support and the second support.

[0013] Further, the surface of the sliding sleeve part is provided with an anti-skid part.

[0014] Further, the anti-skid part is arranged on the side of the sliding sleeve part away from the first support.

[0015] Further, the anti-skid part is composed of a plurality of anti-skid protrusions arranged along the length direction of the first leg.

[0016] Further, the first leg and the second leg are both provided with a structure groove.

[0017] Further, the end of the second leg is provided with a core groove for inserting a drawing element.

[0018] Different from the prior art, the technical scheme above protects the compass by sliding a protective sleeve on the first leg of the compass. The protective sleeve includes a sliding sleeve part and a protective part. The sliding sleeve part enables the protective sleeve to slide stably relative to the first leg. The protective part can be switched between a protective position and a working position by sliding the protective sleeve, and can protect the sharp end and the drawing element at the same time. The overall structure is simple, easy to operate, and simple and beautiful. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Structure front view of the protective sleeve of the compass in the working position according to the specific embodiment;

[0020] Figure 2 Structure front view of the protective sleeve of the compass in the protective position according to the specific embodiment;

[0021] Figure 3 Structure front cross-sectional view of the protective sleeve of the compass in the protective position according to the specific embodiment;

[0022] Figure 4 Structure front cross-sectional view of the protective sleeve of the compass in the protective position according to the specific embodiment;

[0023] Figure 5 Structure front view of the protective sleeve according to the specific embodiment;

[0024] Figure 6 Structure left view of the protective sleeve according to the specific embodiment;

[0025] Figure 7 Structure right view of the protective sleeve according to the specific embodiment;

[0026] Figure 8 Structure top view of the protective sleeve according to the specific embodiment;

[0027] Figure 9 Process schematic diagram of the protective sleeve switching from the working position to the protective position according to the specific embodiment.

[0028] Figure 10 Structure right view of the compass according to another specific embodiment;

[0029] REFERENCE SIGNS

[0030] 1, compass stand; 2, first leg; 21, positioning block; 22, limiting block; 23, first sliding groove; 24, first structure plate; 3, second leg; 32, second structure plate; 31, second sliding groove; 4, protective sleeve; 41, sliding sleeve part; 411, anti-skid part; 42, protection part; 421, upper clamping block; 422, lower clamping block; 423, face plate; 424, connecting plate; 425, sliding bar; 426, blocking bar; 50, structure groove; 51, core groove; 52, tip; 53, drawing element. DETAILED DESCRIPTION

[0031] To describe the technical content, structural features, purposes and effects of the technical solutions in detail, the following will be described in detail in combination with specific embodiments and the accompanying drawings.

[0032] In this document, the term "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, and does not particularly limit the independence or association between other embodiments. In principle, in this application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0033] Unless otherwise defined, the meanings of the technical terms used in this document are the same as those commonly understood by those skilled in the art to which the present application belongs; the use of related terms in this document is only for the purpose of describing specific embodiments, and is not intended to limit the present application.

[0034] In the description of the present application, the phrase "and / or" is used to describe the logical relationship between the objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this document generally represents the logical relationship of "or" between the associated objects before and after.

[0035] In this application, such as "first" and "second", the terms are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary and secondary or order relationship between the entities or operations.

[0036] In the present application, the terms "comprise", "contain", "include", or other similar phrases used in the statements mean to encompass the non-exclusive inclusion, and the terms do not exclude the presence of additional elements in the process, method or product comprising the stated elements, so that the process, method or product comprising a series of elements can not only include those defined elements, but also include other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0037] In the present application, the terms "greater than", "less than", "exceed" and the like are understood as not including the number itself; the terms "above", "below", "within" and the like are understood as including the number itself. In addition, in the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), and similar expressions related to "multiple" are also understood in this way, for example, "multiple groups", "multiple times" and the like, unless otherwise explicitly specified.

[0038] In the description of the embodiments of the present application, the spatial-related terms used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "perpendicular", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or the drawings, and are only for the convenience of describing the specific embodiments of the present application or for the reader to understand, and do not indicate or imply that the indicated device or component must have a particular position, a particular orientation, or be constructed or operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0039] Unless otherwise explicitly specified or limited, in the description of the embodiments of the present application, the terms "mount", "connect", "connect", "fix", "set", and the like should be understood broadly. For example, the "connection" can be a fixed connection, or a detachable connection, or an integral setting; it can be a mechanical connection, or an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art to which the present application belongs, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0040] Please refer to Figures 1 to 10The embodiment provides a compass, which comprises a compass seat 1, a first supporting leg 2, a second supporting leg 3 and a protective sleeve 4, the top end of the first supporting leg 2 and the top end of the second supporting leg 3 are rotationally connected with the compass seat 1 respectively, and the bottom end of the first supporting leg 2 and the bottom end of the second supporting leg 3 are respectively provided with a pointed end 52 or a drawing element 53.

[0041] The compass seat 1 is circular or elliptical in shape and serves to support and fix the first supporting leg 2 and the second supporting leg 3. The compass seat 1 is internally provided with a rotating mechanism, so that the first supporting leg 2 and the second supporting leg 3 can be flexibly rotated around the compass seat 1, thereby realizing the drawing of circles with different radii. The material of the compass seat 1 is mostly metal or high-strength plastic, so as to ensure the stability and durability of the structure, and the surface of the compass seat 1 is subjected to smooth treatment, so as to reduce the friction during rotation and ensure the smoothness of the drawing process. The rotating mechanism can refer to the common structure of existing compasses, for example, the rotating mechanism can comprise a central shaft, two supporting leg connecting holes and corresponding rotating bearings or bushings, the central shaft is vertically fixed at the center position of the compass seat 1 and serves to provide support and positioning for the rotation of the supporting legs, the two supporting leg connecting holes are respectively located at the two sides of the compass seat 1 and are matched with the top ends of the first supporting leg 2 and the second supporting leg 3, so as to serve to install and fix the supporting legs, and the rotating bearings or bushings are generally embedded in the connecting holes, so as to reduce the friction between the supporting legs and the compass seat 1 and improve the flexibility and precision of rotation.

[0042] The top end of the first supporting leg 2 is connected with the compass seat 1 in a rotating manner and can be freely rotated within a certain plane around the compass seat 1 within a limited angle. The length of the supporting leg can be designed according to actual requirements and generally has a certain rigidity, so as to ensure that the compass can be stably supported during the drawing process. The bottom end of the first supporting leg 2 can be provided with a pointed end 52 or a drawing element 53, when the pointed end 52 is equipped, it is used to be fixed on paper as the center of a circle and ensures that the compass does not displace during the drawing process, when the drawing element 53 such as a pencil core or an ink pen head is equipped, it is used to draw a circular line, and the precision directly affects the quality of the drawn circle. The second supporting leg 3 is similar in structure to the first supporting leg 2, and the top end thereof is also rotationally connected with the compass seat 1, and the bottom end thereof is provided with a pointed end 52 or a drawing element 53. It should be noted that when the bottom end of the first supporting leg 2 is provided with the pointed end 52, the bottom end of the second supporting leg 3 is correspondingly provided with the drawing element 53, and vice versa. During use, the second supporting leg 3 cooperates with the first supporting leg 2 to jointly determine the radius and shape of a circle. When the pointed end 52 of the first supporting leg 2 is fixed as the center of a circle, the drawing element 53 of the second supporting leg 3 moves along a circular track to complete the drawing of a circle. The design of the second supporting leg 3 also focuses on stability and flexibility, so as to ensure that the compass can accurately draw the required circle in different use scenarios.

[0043] The tip 52 can be installed at the bottom end of the first leg 2 or the second leg 3 to provide a stable support point for the compass. The material of the tip 52 can be metal, such as stainless steel, and the surface is finely processed to reduce friction with paper while ensuring durability. The length and shape of the tip 52 should be set according to the overall size and usage requirements of the compass to ensure its stability and reliability when fixing the center of the circle.

[0044] The drawing element 53 is used to draw circular lines, commonly pencil leads and ink pen tips, etc. A clamping device can be provided at the bottom end of the leg to clamp the drawing element 53 in the clamping device at the bottom end of the leg, and different hardness drawing elements 53 can be replaced as needed to meet different drawing requirements. The drawing element 53 can also be installed at the bottom end of the leg through threaded connection or other fixing methods.

[0045] The protective sleeve 4 includes a sliding sleeve part 41 and a protective part 42, the sliding sleeve part 41 is sleeved on the first leg 2, and the protective part 42 extends from the side of the sliding sleeve part 41 close to the second leg 3 to the bottom end of the first leg 2. The side of the first leg 2 close to the second leg 3 is provided with a positioning block 21 and a limiting block 22, and the inner side of the protective part 42 is sequentially provided with an upper clamping block 421 and a lower clamping block 422 from top to bottom. The protective sleeve 4 is switched between the working position and the protection position by sliding; when the protective sleeve 4 is in the working position, the lower clamping block 422 abuts against the upper surface of the positioning block 21, and the tip 52 or the drawing element 53 protrudes out of the protective part 42; when the protective sleeve 4 is in the protection position, the upper clamping block 421 abuts against the lower surface of the positioning block 21, the lower clamping block 422 abuts against the upper surface of the limiting block 22, and the tip or the drawing element 53 is received in the protective part 42.

[0046] The sliding sleeve part 41 has at least three surfaces fitted to the first leg 2, for example, the left surface, the front surface and the rear surface of the first leg 2 are fitted, and the right surface of the first leg 2 can be fitted by the connecting plate 424 of the protective part 42, so as to realize stable sliding sleeve connection. The protective part 42 is arranged between the first leg 2 and the second leg 3, and its structural components at least include two panels 423 and a connecting plate 424 between the two panels 423. The panel 423 can be a straight panel or a curved panel 423. It should be noted that in order to protect the tip 52 and the drawing element 53 at the same time, at least two accommodation spaces should be formed at the bottom end of the protective part 42 to accommodate the tip 52 and the drawing element 53 respectively, that is, a space capable of accommodating the tip 52 or the drawing element 53 should be formed with the connecting plate 424. When the compass is unfolded, the protective sleeve 4 rotates with the first leg 2.

[0047] The use principle of the novel is as follows: in the initial state, the protective sleeve 4 is in the protection position, at this time the protective sleeve 4 is located at the lowest end of the movable stroke, at this time the protection part 42 of the protective sleeve 4 accommodates the sharp end 52 and the drawing part 53 into its interior, avoiding the sharp end 52 from being exposed outside to stab other objects or injure the human body, and also protecting the drawing part 53 from being damaged by external force. When the compass is needed, the protective sleeve 4 can be slid upward by applying force to the sleeve joint part or the protection part 42, in the sliding process, the upper clamping block 421 and the lower clamping block 422 pass the positioning block 21 in turn, and the force is removed at this time, at this time the protective sleeve 4 cannot fall down due to the blocking of the lower clamping block 422 by the positioning block 21, at this time the process of switching the protective sleeve 4 from the protection position to the working position is completed, when the protective sleeve 4 is located at the working position, at this time the protective sleeve 4 is located at the highest end of the movable stroke, at this time the sharp end 52 and the drawing part 53 are exposed outside and not accommodated in the protective sleeve 4, that is, the compass can be unfolded for normal use. Due to the blocking of the positioning block 21 to the lower clamping block 422, the protective sleeve 4 can be stably kept at the working position, after use, the first leg 2 and the second leg 3 of the compass are rotated to the home position, the protective sleeve 4 is slid downward by applying force to the sleeve joint part or the protection part 42, in the sliding process, the lower clamping block 422 and the upper clamping block 421 pass the positioning block 21 in turn, and the force is removed at this time, at this time the lower clamping block 422 is blocked by the limiting block 22 and the upper clamping block 421 is blocked by the positioning block 21, the sharp end 52 and the drawing part 53 are accommodated into the protective sleeve 4 again, and due to the blocking of the limiting block 22 to the lower clamping block 422, the protective sleeve 4 cannot slide downward excessively, and due to the blocking of the positioning block 21 to the upper clamping block 421, the protective sleeve 4 cannot slide upward due to small force, and can be stably kept at the protection position.

[0048] The novel can slide the protective sleeve 4 on the first leg 2 of the compass, the protective sleeve 4 includes a sliding sleeve part 41 and a protection part 42, the sliding sleeve part 41 enables the protective sleeve 4 to stably slide relative to the first leg 2, the sliding of the protective sleeve 4 enables the protection part 42 to switch between the protection position and the working position, and can protect the sharp end 52 and the drawing part 53 at the same time, the overall structure is simple, convenient and fast to operate, simple and beautiful.

[0049] In actual use, since the compass is usually placed in the stationery box, it is easy to shake during movement, which may cause the legs of the compass to expand. Since the protective sleeve 4 is sleeved on the first leg 2, the drawing piece 53 or the tip 52 will be separated from the protective sleeve 4 after the second leg 3 is expanded, and the protection function is lost. In order to prevent the needle leg of the compass from expanding by itself, further, the inner side of the protection part 42 is provided with a sliding strip 425, the first leg 2 is provided with a first sliding groove 23, and the second leg 3 is provided with a second sliding groove 31. When the protective sleeve 4 is in the protection position, the two groups of sliding strips 425 are respectively slid into the first sliding groove 23 and the second sliding groove 31, and the movement direction of the sliding strip is limited through the first sliding groove 23 and the second sliding groove 31, so as to lock the first leg 2 and the second leg 3. It should be noted that, based on the front view of the compass, the first sliding groove 23 can be arranged on the front and / or back of the first leg 2. At this time, the sliding strip should be arranged on the inner side of the front panel 423 of the protection part 42. The first sliding groove 23 can also be arranged on the right side of the first leg 2. At this time, the structure of the first sliding groove 23 should be wide slot and narrow mouth. Correspondingly, the structure of the sliding strip should be wide head and narrow body, so as to realize locking. Similarly, the structure and arrangement position of the second sliding groove 31 are the same as those of the first sliding groove 23, which will not be described here. Through the sliding connection of the sliding strip and the first sliding groove 23 and the second sliding groove 31, when the protective sleeve 4 is switched to the protection position, the second leg 3 is limited by the relative action of the sliding strip and the sliding groove in the expansion direction, and cannot be expanded, so as to avoid the separation of the second leg 3 and the protective sleeve 4 and the loss of protection.

[0050] Further, the top end of the sliding strip located near the second leg 3 extends transversely to form a blocking strip 426. When the protective sleeve 4 is in the protection position, the blocking strip abuts against the notch of the second sliding groove 31 to assist in limiting, so as to avoid excessive downward movement of the protective sleeve 4.

[0051] Further, the first leg 2 is provided with a first structure plate 24 on the side close to the second leg 3, the second leg 3 is provided with a second structure plate 32 on the side close to the first leg 2, the positioning block 21, the limiting block 22 and the first sliding groove 23 are arranged on the first structure plate 24, and the second sliding groove 31 is arranged on the second structure plate 32. The thickness of the first structure plate 24 is less than the thickness of the main body of the first leg 2, the thickness of the second structure plate 32 is less than the thickness of the main body of the second leg 3, and the thickness of the first structure plate 24 and the second structure plate 32 can be the same. By adapting the internal space of the protection part 42 to the first structure plate 24 and the second structure plate 32, the first structure plate 24, the second structure plate 32 and the protection part 42 form a sliding strip sliding groove structure, and the sliding stability of the protection sleeve 4 is improved. On this basis, the shape structure of the protection part can be adaptively configured relative to the first leg 2 and the second leg 3, so that the surface of the protection part is located in the same plane as the surface of the first leg 2 and the second leg 3, and the hand feeling and the aesthetic appearance of the compass are improved.

[0052] In order to facilitate the pushing of the protection sleeve 4 and enable it to be flexibly switched between the working position and the protection position, further, the surface of the sliding sleeve part 41 is provided with an anti-skid part 411. The anti-skid part 411 increases the friction force, facilitating the user to push the protection sleeve 4. Based on the front view angle of the compass, the anti-skid part 411 can be arranged on the front surface or the back surface of the sliding sleeve part 41. In order to conform to the hand force habit, the anti-skid part 411 is arranged on the side surface of the sliding sleeve part 41 away from the first leg 2, that is, the left surface. The anti-skid part 411 can be directly made of an anti-skid material as a surface layer, such as anti-skid plastic, anti-skid rubber and the like. An anti-skid dot matrix structure can also be arranged. Preferably, the anti-skid part 411 is composed of a plurality of anti-skid protrusions arranged along the length direction of the first leg 2.

[0053] Further, the first leg 2 and the second leg 3 are each provided with a structure groove 50. The structure groove 50 is formed by hollowing out based on the structure plane, which can effectively save production materials and reduce costs without affecting the structural rigidity.

[0054] Referring to Figure 10 Further, the end of the second leg 3 is provided with a core groove 51 for inserting a drawing element 53. The drawing element 53 can be a pencil core, and by inserting a pencil core of a suitable size into the core groove 51, drawing can be performed conveniently and quickly.

[0055] It should be noted that although the above embodiments have been described herein, the patent protection scope of the utility model is not limited thereby. Therefore, based on the innovative concept of the utility model, the changes and modifications of the embodiments described herein, or the equivalent structures or equivalent process transformations made by using the contents of the utility model specification and drawings, directly or indirectly apply the above technical solutions to other related technical fields, are all included in the protection scope of the utility model patent.

Claims

1. A compass, characterized in that: The compass includes a compass seat, a first leg, a second leg, and a protective sleeve, the top end of the first leg and the top end of the second leg are rotatably connected with the compass seat, the bottom end of the first leg and the bottom end of the second leg are respectively provided with a sharp end or a drawing element; The protective sleeve includes a sliding sleeve part and a protective part, the sliding sleeve part is sleeved on the first leg, the protective part extends from the side of the sliding sleeve part close to the second leg to the bottom end of the first leg, the side of the first leg close to the second leg is provided with a positioning block and a limiting block, the inner side of the protective part is sequentially provided with an upper clamping block and a lower clamping block from top to bottom, the protective sleeve is switched between a working position and a protection position by sliding, when the protective sleeve is in the working position, the lower clamping block abuts against the upper surface of the positioning block, and the sharp end or the drawing element protrudes out of the protective part, when the protective sleeve is in the protection position, the upper clamping block abuts against the lower surface of the positioning block, the lower clamping block abuts against the upper surface of the limiting block, and the sharp end or the drawing element is received in the protective part.

2. A compass according to claim 1, wherein: The inner side of the protective part is provided with a sliding strip, the first leg is provided with a first sliding groove, and the second leg is provided with a second sliding groove, when the protective sleeve is in the protection position, the two groups of sliding strips are respectively slid into the first sliding groove and the second sliding groove, the movement direction of the sliding strips is limited through the first sliding groove and the second sliding groove, and the first leg and the second leg are locked.

3. A compass according to claim 2, wherein: The top end of the sliding strip on the side close to the second leg extends transversely to form a blocking strip.

4. A compass according to claim 2, wherein: The first leg is provided with a first structural plate on the side close to the second leg, the second leg is provided with a second structural plate on the side close to the first leg, the positioning block, the limiting block, and the first sliding groove are arranged on the first structural plate, and the second sliding groove is arranged on the second structural plate.

5. A compass according to claim 4, wherein: The surface of the protective part is in the same plane as the surfaces of the first leg and the second leg.

6. The compass of claim 1 wherein: The surface of the sliding sleeve part is provided with an anti-skid part.

7. A compass according to claim 6, wherein: The anti-skid part is arranged on the side of the sliding sleeve part away from the first leg.

8. A compass according to claim 6, wherein: The anti-skid part is composed of a plurality of anti-skid convex strips arranged along the length direction of the first leg.

9. The compass of claim 1 wherein: The first leg and the second leg are both provided with a structural groove.

10. The compass of claim 1 wherein: The end of the second leg is provided with a core groove for inserting a drawing element.

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