A compass

Abstract

The application relates to a compass, which comprises a main body, two compass legs rotatably connected to the main body, and a compass foot arranged in each compass leg; a rotating driving mechanism is arranged on the main body and is connected with each compass foot; the rotating driving mechanism drives each compass foot to synchronously extend and retract relative to the compass leg through forward and reverse rotation; an opening is arranged on each compass leg, and a buckle is arranged on the compass foot in the compass leg and can be buckled into the opening. The compass can prevent safety problems caused by accidental touch and can prevent the influence on drawing caused by the retraction of the compass foot due to accidental touch.

Description

Technical Field

[0001] This invention relates to the field of stationery technology, and in particular to a compass. Background Technology

[0002] As a fundamental tool in the field of drafting, the compass is widely used in various scenarios such as teaching, engineering drawing, and art creation. Its core function is to draw circles or arcs, and accuracy and safety are key indicators for evaluating its performance. Traditional compasses mostly adopt a fixed structure design, and the length of the compass legs cannot be automatically retracted. During carrying, storage, and use, the sharp tips of the compass legs can easily scratch users, especially students, posing a significant safety hazard in daily use. Furthermore, there is the problem of the compass legs being damaged by bumps and knocks, affecting drawing accuracy, making it difficult to meet the needs for convenient and safe use.

[0003] To address the safety shortcomings of traditional compasses, retractable compasses have gradually become a research hotspot. Their core idea is to achieve the extension and retraction of the compass legs through a controllable telescopic structure, balancing convenience and safety. Chinese invention patent CN115257216B (application number 202211087326.3) discloses a compass with a push-to-retract component. By pressing this component, the first and second compass legs can be extended and retracted simultaneously. Compared to traditional compasses, this simplifies the operation process, improves ease of use, and effectively avoids the safety risks associated with exposed compass legs, thus optimizing the user experience to some extent. However, in actual use, due to the lack of an effective anti-accidental activation design for the push-to-retract component, accidental activation is highly likely during daily carrying, storage, or retrieval, causing the needle tip or pen refill to pop out unexpectedly, still posing a risk of injury. Therefore, it cannot fundamentally guarantee safety during use and storage. Furthermore, during the drawing process, users may accidentally trigger the retractable component due to hand contact or incorrect force, causing the first and second compass legs to retract unintentionally. This not only interrupts the drawing process and affects efficiency but may also lead to deviations in the drawn shape, reducing accuracy. The impact of accidental retraction is particularly pronounced in detailed drawing scenarios. In conclusion, current retractable compasses do not completely eliminate the safety hazards associated with compasses and fail to meet the requirements for stable use. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a compass that can prevent safety problems caused by accidental contact, and at the same time prevent the compass legs from retracting due to accidental contact, which would affect the drawing.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a compass, comprising a main body, two compass legs that are rotatably connected to the main body, and a compass foot provided in each compass leg;

[0006] The main body is provided with a rotary drive mechanism, which is driven by each gauge foot. The rotary drive mechanism drives each gauge foot to extend and retract synchronously relative to the gauge leg by rotating in both directions.

[0007] Each gauge leg has an opening, and the gauge foot located inside the gauge leg has a buckle that can be fastened into the opening.

[0008] Preferably, the guide foot includes a support rod and a foot body connected to the lower end of the support rod.

[0009] As an improvement, the support rod includes a first rod body and a second rod body distributed vertically, the foot body is connected to the lower end of the second rod body, the buckle is set on the second rod body, and the guide leg is provided with an elastic element that presses the second rod body upward.

[0010] As an improvement, the lower part of the first rod is provided with a limiting hole with a downward opening, and the upper end of the second rod is limited in the limiting hole so as to move up and down.

[0011] Alternatively, the upper part of the second rod may be provided with an upward-opening limiting hole, and the lower end of the first rod may be moved up and down and limited within the limiting hole.

[0012] As an improvement, the corresponding leg is provided with a pressing member that can be inserted into the opening.

[0013] As an improvement, the rotary drive mechanism includes a rotating component, a linkage component, and a connecting rod. The rotating component is rotatably sleeved outside the main body, and the connecting rod is vertically movably limited inside the main body. The linkage component is driven and connected between the connecting rod and the rotating component. The linkage component moves up and down with the rotation of the rotating component and drives the connecting rod to move up and down.

[0014] The upper ends of both gauge feet are rotatably connected to the lower end of the connecting rod in the direction of opening and closing rotation.

[0015] As an improvement, the inner wall of the rotating component is provided with a spiral step surface, the linkage component is vertically moved and limited within the main body, the outer wall of the linkage component is provided with a positioning part placed under the spiral step surface, and the main body is provided with a guide hole for the positioning part to be inserted vertically.

[0016] As an improvement, a cover is connected to the upper end of the main body, and a grip portion for hand-holding is formed at the upper end of the cover.

[0017] As an improvement, the main body includes an upper section and a lower section that are integrally connected. Both the upper section and the lower section have mounting cavities. A partition is provided between the upper section and the lower section inside the main body.

[0018] The linkage is disposed in the upper section body, and the connecting rod passes through the partition and is disposed in the upper section body and the lower section body. The lower part of the connecting rod has a protrusion that can abut against the partition.

[0019] The diameter of the upper section is smaller than that of the lower section, and the rotating component is sleeved on the upper section and flush with the outer wall of the lower section.

[0020] As an improvement, the upper ends of the two gauge legs are respectively provided with meshing teeth that engage with each other.

[0021] Compared with existing technologies, the advantages of this invention are as follows: The compass in this invention is equipped with a rotary drive mechanism associated with the two compass legs. The two compass legs are driven synchronously by rotating this mechanism. Thus, a single operation can drive both legs simultaneously, enabling rapid retraction and extension of the legs. Furthermore, the rotary drive mechanism effectively avoids accidental activation and prevents the legs from accidentally popping out, mitigating the risk of injury and ensuring safety during use and storage. Additionally, the perforated structure of the legs, combined with the clips on the legs, ensures the stability of the legs' position when they are pressed down and exposed, preventing accidental retraction and avoiding any impact on drawing efficiency and accuracy during compass use. Attached Figure Description

[0022] Figure 1 This is a perspective view of the compass in a non-use state in an embodiment of the present invention.

[0023] Figure 2 for Figure 1 The exploded diagram.

[0024] Figure 3 for Figure 1 A sectional view.

[0025] Figure 4 This is a perspective view of the compass in the extended state of the foot body in an embodiment of the present invention.

[0026] Figure 5 for Figure 4 A sectional view.

[0027] Figure 6 This is a perspective view of the compass in use according to an embodiment of the present invention.

[0028] Figure 7 for Figure 6 Another perspective view.

[0029] Figure 8 for Figure 6 A sectional view. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] like Figures 1 to 8 As shown, the compass in this embodiment includes a main body 1 and two legs 2 rotatably connected to the main body 1. Each leg 2 has a foot 3, which can extend and retract within the leg 2 in the vertical direction. In use, the foot 3 extends beyond the lower end of the leg 2 to perform needle tip positioning or pen lead drawing. In non-use, the foot 3 retracts into the leg 2, protected by the wall of the leg 2, preventing injury from exposure or damage to the pen lead, and ensuring the compass's safety during carrying and storage.

[0032] The main body 1 is equipped with a rotary drive mechanism 4, which is connected to each gauge foot 3. The rotary drive mechanism 4 can drive each gauge foot 3 to extend and retract synchronously relative to the gauge leg 2 by rotating in both directions. In this way, a single rotary operation drives the extension and retraction of all gauge feet 3 simultaneously, eliminating the need to operate the extension and retraction structure of each gauge leg 2 independently. The operation steps are greatly simplified, and the efficiency is significantly improved. Moreover, compared with the existing push-button structure, the rotary drive method is less likely to be accidentally triggered during daily carrying and storage. The rotation action requires the finger to apply a continuous torsional torque. Accidental collisions or squeezing are unlikely to generate sufficient rotational driving force, thus effectively preventing the gauge feet 3 from accidentally popping out or retracting. This ensures the safety of use and storage, and also avoids the problem of gauge feet 3 retraction affecting drawing accuracy due to accidental touch during the drawing process.

[0033] The rotary drive mechanism 4 in this embodiment specifically includes a rotating component 41, a linkage component 42, and a connecting rod 43. The rotating component 41 is rotatably sleeved outside the main body 1, and the connecting rod 43 is vertically movably limited within the main body 1. The linkage component 42 is drively connected between the connecting rod 43 and the rotating component 41. The linkage component 42 moves up and down along the axial direction of the main body 1 as the rotating component 41 rotates, and drives the connecting rod 43 to move up and down synchronously. The upper ends of the two gauge feet 3 are rotatably connected to the lower end of the connecting rod 43 along the opening and closing rotation direction of the gauge legs 2. When the connecting rod 43 moves up and down, since each gauge foot 3 is rotatably connected to the lower end of the connecting rod 43, the axial displacement of the connecting rod 43 can drive each gauge foot 3 to move up and down along its respective gauge leg 2, realizing the telescopic movement relative to the gauge leg 2. The rotatable connection between the gauge feet 3 and the connecting rod 43 allows the gauge feet 3 to be unconstrained by the circumferential direction of the connecting rod 43 when they open and close with the gauge legs 2, and the two gauge legs 2 can freely adjust their opening and closing angles. The outer surface of the rotating part 41 can be provided with anti-slip texture or knurling to facilitate finger operation and improve the comfort of grip.

[0034] To achieve stable and reliable driving of the connecting rod 43, the inner wall of the rotating component 41 is provided with a spiral stepped surface 411. The linkage component 42 is vertically limited within the main body 1, and the outer wall of the linkage component 42 is provided with a positioning part 421 placed under the spiral stepped surface 411. The main body 1 has a guide hole 11 vertically provided for the positioning part 421 to be inserted. The cooperation between the spiral stepped surface 411 and the positioning part 421 converts the rotational motion of the rotating component 41 into the linear motion of the linkage component 42 in the up-down direction. The transmission is smooth and reliable, and the operation feels uniform and smooth. The user can feel continuous and uniform resistance feedback during rotation, which is beneficial for accurately controlling the extension of the gauge foot 3. The guide hole 11 forms a guiding constraint on the vertical movement of the positioning part 421, ensuring that the linkage component 42 only translates axially and does not rotate circumferentially, resulting in high motion accuracy and a compact structure.

[0035] In this embodiment, the main body 1 includes an integrally connected upper section 12 and lower section 13. Both the upper section 12 and lower section 13 have mounting cavities. A partition 14 is provided between the upper section 12 and lower section 13 within the main body 1. A linkage 42 is disposed within the upper section 12, and a connecting rod 43 passes through the partition 14 and is disposed within both the upper and lower sections 13. The lower part of the connecting rod 43 has a boss 431 that abuts against the partition 14. The partition 14 separates the upper and lower parts of the linkage 42 and connecting rod 43, as well as each guide foot 3, allowing the internal transmission structure and the lower telescopic assembly to be arranged in an orderly, partitioned manner, avoiding structural interference and facilitating independent assembly and maintenance of each component. The boss 431 abuts against the partition 14 when the connecting rod 43 moves upward, forming a limit and preventing the connecting rod 43 from moving excessively upward and detaching from the main body 1. The integral connection structure of the upper section 12 and lower section 13 ensures the overall rigidity and assembly accuracy of the main body 1.

[0036] In addition, the diameter of the upper section 12 is smaller than that of the lower section 13, and the rotating component 41 is fitted outside the upper section 12 and flush with the outer wall of the lower section 13. This structure makes the outer wall surface of the rotating component 41 flush with the outer wall surface of the lower section 13, resulting in a smooth and flat overall appearance without any abrupt steps. It is comfortable to hold and aesthetically pleasing, while also allowing for even application of force by the fingers on the surface of the rotating component 41, ensuring smooth operation.

[0037] Linkage component 42 is fixedly connected to the upper end of connecting rod 43. To ensure reliable upward movement and reset of connecting rod 43, a reset spring 44 can be installed outside connecting rod 43. The lower end of reset spring 44 abuts against the main body 1, specifically against partition 14, and the upper end of reset spring 44 abuts against linkage component 42. When the rotary drive mechanism 4 drives the gauge foot 3 to extend, linkage component 42 moves downward to compress reset spring 44 and store energy. When rotating component 41 is rotated in the opposite direction, the elastic restoring force of reset spring 44 assists linkage component 42 to return to its original position, driving connecting rod 43 to move upward, causing gauge foot 3 to retract into gauge leg 2. The reset spring 44 eliminates the need for additional drive components for retraction; return to position is achieved solely by reversing rotation to release the stored spring force, resulting in a simple structure and reliable operation.

[0038] A cover 6 is connected to the upper end of the main body 1, and a grip part 61 for hand gripping is formed at the upper end of the cover 6. The grip part 61 makes it easy for the user to hold the compass body 1 and rotate it when drawing. The cover 6 forms a sealed protection for the inside of the main body 1 to prevent dust from entering and affecting the normal operation of the rotation drive mechanism 4.

[0039] Each gauge leg 2 has an opening 21, and the gauge foot 3 located inside the gauge leg 2 has a buckle 30 that can be fastened into the opening 21. As the gauge foot 3 moves downwards and extends out of the gauge leg 2, when the buckle 30 moves to a position aligned with the opening 21, the buckle 30, constrained by the limited space inside the gauge leg 2, will fasten into the opening 21, locking the gauge foot 3 in its exposed position. To ensure that the buckle 30 can be smoothly fastened into the opening 21, a small-volume spring-loaded component can also be provided inside the gauge leg 2. This spring-loaded component has a tendency to spring against the gauge foot 3 towards the opening 21, thus ensuring that the buckle 30 on the gauge foot 3 is fastened into the opening 21, achieving the locking of the gauge foot 3's position relative to the gauge leg 2, that is, locking the length of the foot 32 protruding from the lower end of the gauge leg 2.

[0040] The locking structure of the opening 21 and the latch 30 prevents the gauge foot 3 from retracting due to accidental contact with the drive mechanism after it has extended into position. This effectively avoids drawing interruptions and accuracy deviations caused by the accidental retraction of the gauge foot 3 during the drawing process, and especially ensures stability in fine drawing scenarios. Compared to the method of maintaining the position of the gauge foot 3 solely by the resistance of the drive mechanism itself, the mechanical locking of the latch 30 and the opening 21 provides a deterministic position holding force, ensuring reliable locking unaffected by external factors such as vibration and temperature changes.

[0041] In this embodiment, the guide foot 3 includes a support rod 31 and a foot body 32 connected to the lower end of the support rod 31. The support rod 31 constitutes the main support structure of the guide foot 3, and the foot body 32 is located at the lower end of the guide leg 2 as a working part during drawing. In this embodiment, one of the foot bodies 32 on the two guide feet 3 is a positioning pin, used to insert into the center of the paper for positioning, and the other is a pen lead, used to contact the paper for drawing arcs.

[0042] The support rod 31 includes a first rod body 311 and a second rod body 312 distributed vertically. A foot 32 is connected to the lower end of the second rod body 312. A buckle 30 is mounted on the second rod body 312. An elastic element 5 is provided inside the guide leg 2 to spring upwards and press the second rod body 312. The lower part of the first rod body 311 has a downward-opening limiting hole, and the upper end of the second rod body 312 is movable up and down and limited within the limiting hole. Alternatively, the upper part of the second rod body 312 has an upward-opening limiting hole 3121, and the lower end of the first rod body 311 is movable up and down and limited within the limiting hole 3121. The latter solution is chosen in this embodiment. The separate structure design of the first rod body 311 and the second rod body 312 ensures that after the guide leg 3 extends and locks, since the first rod body 311 and the second rod body 312 are relatively independent, changes in the position of the first rod body 311 will not affect the locked state of the second rod body 312. Specifically, when the two gauge legs 2 open at different angles, the gauge feet 3 within the gauge legs 2 will undergo slight relative displacement as the angle changes. At this time, the first rod 311 can be slightly adjusted in position with the connecting rod 43, while the second rod 312 remains stationary due to the locking buckle 30. The exposed length of the foot 32 remains constant, thus ensuring that the gauge feet 3 remain stably exposed even when the gauge legs 2 adjust their opening angle, guaranteeing that drawing accuracy is not affected. The limiting hole provides a guiding constraint for the vertical movement of the first rod 311 relative to the second rod 312, ensuring the axial consistency of the first rod 311 and the second rod 312 and preventing them from skewing during relative extension and retraction. The elastic element 5 is sleeved outside the gauge feet 3 and acts on the second rod 312, using the gauge feet 3 themselves as the guide shaft for the elastic element 5. This design is compact and easy to assemble.

[0043] Each of the two gauge legs 2 is equipped with a pressing member 22 that can be inserted into the opening 21. When the two gauge legs 2 are closed, the pressing members 22 on both sides are inserted into the opening 21 of the opposite gauge leg 2, pushing the buckle 30 out of the opening 21 to release it from the lock. The second rod 312 then automatically moves upward and resets under the elastic force of the elastic member 5, and the gauge foot 3 is completely retracted into the gauge leg 2. This structure achieves automatic triggering of gauge foot 3 retraction while the gauge legs 2 are closed, without the need for additional user unlocking. The storage action is completed in one go, which is simple and reliable. Based on the elastic member 5, even without the aforementioned reset spring 44, the elastic force of the elastic member 5 will push the first rod 311 and the connecting rod 43 to move upward and reset synchronously.

[0044] The upper ends of the two gauge legs 2 are respectively provided with meshing teeth 23. The meshing teeth 23 keep the two gauge legs 2 synchronized during opening and closing rotation, ensuring that the opening and closing angles of the two legs are consistent and the position is stable, so that the roundness accuracy will not be affected by the wobbling of one side of the leg during drawing. At the same time, the meshing teeth 23 structure allows the two legs to self-lock at any angle without the need for an additional locking mechanism, making it convenient to use.

[0045] When using the compass, the user rotates the rotating component 41, which is fitted onto the main body 1, with their fingers. As the rotating component 41 rotates, the spiral step surface 411 on its inner wall pushes the positioning part 421 on the outer wall of the linkage component 42 downward along the guide hole 11. The linkage component 42 drives the connecting rod 43 to move downward synchronously. During the downward movement of the connecting rod 43, the axial thrust is transmitted to the two compass feet 3, causing the two compass feet 3 to extend downward along their respective compass legs 2. During the extension of the compass feet 3, the second rod body 312 moves downward synchronously with the first rod body 311, and the elastic element 5 is compressed and stores energy. When the buckle 30 on the second rod body 312 moves to the position aligned with the opening 21, the buckle 30 automatically engages in the opening 21, locking the second rod body 312, and the foot body 32 is stably exposed at the lower end of the compass legs 2. The user then opens the two compass legs 2 to the desired angle. Due to the synchronous linkage of the meshing teeth 23, the two legs rotate at equal angles and remain stably in the desired position. The user inserts the positioning pin into the center of the circle on the paper, contacts the paper with the pen lead, and rotates the compass to complete the drawing. During the drawing process, the locking engagement between the latch 30 and the opening 21 effectively prevents the compass foot 3 from retracting due to accidental contact, and the exposed length of the foot 32 remains unchanged, ensuring stable and reliable drawing accuracy.

[0046] After drawing is completed, the user rotates the two gauge legs 2 to bring them together. During the closing process, the pressing members 22 on both sides push into the openings 21 of the opposite gauge legs 2, pushing the buckles 30 out of the openings 21 to release them from the lock. At this time, the rotating member 41 is rotated in the opposite direction. As the constraint height of the spiral step surface 411 on the linkage member 42 moves upward, and with the elastic restoring force of the return spring 44, the linkage member 42 is pushed upward, and the connecting rod 43 rises accordingly. The first rod 311 moves upward and resets under the action of the connecting rod 43. At the same time, the elastic force of the elastic member 5 pushes the second rod 312 upward and resets along with the first rod 311. The gauge foot 3 is completely retracted into the gauge leg 2. The foot 32 is surrounded and protected by the wall of the gauge leg 2 to avoid exposure and injury or damage to the pen lead.

[0047] The compass of this invention is equipped with a rotary drive mechanism 4 that is associated with the two compass legs 3. The two compass legs 3 are driven synchronously by rotating the rotary drive mechanism 4. Thus, a single operation can drive both compass legs 3 simultaneously, enabling rapid retraction and extension of the two compass legs 3. Furthermore, the rotary drive mechanism 4 effectively avoids accidental activation and prevents the compass legs 3 from accidentally popping out, mitigating the risk of injury and ensuring safety during use and storage. Additionally, the opening 21 in the compass legs 2, combined with the clips 30 on the compass legs 3, ensures the stability of the compass legs 3 when they are pressed down and exposed from the legs 2. This prevents the compass legs 3 from retracting due to accidental activation, thus avoiding any impact on drawing efficiency and accuracy during compass use.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. For those skilled in the art, various modifications and improvements can be made without departing from the concept of the present invention, such as equivalent substitutions, additions, deletions, or recombinations of the technical features in the above embodiments to form new technical solutions; these all fall within the scope of protection of the present invention. Therefore, the patent protection scope of the present invention should be determined by the scope defined in the appended claims.

[0049] The specification and claims of this invention use terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," to describe various exemplary structural parts and elements of the invention. However, these terms are used herein merely for ease of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this invention can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A compass, comprising a body (1) and two legs (2) rotatably connected to the body (1), characterized in that: Each gauge leg (2) has a gauge foot (3); The main body (1) is provided with a rotary drive mechanism (4), which is driven by each gauge foot (3). The rotary drive mechanism (4) drives each gauge foot (3) to extend and retract synchronously relative to the gauge leg (2) by rotating in both directions. Each gauge leg (2) has an opening (21), and the gauge foot (3) located inside the gauge leg (2) has a buckle (30) that can be fastened into the opening (21).

2. The compass according to claim 1, characterized in that: The foot (3) includes a support rod (31) and a foot body (32) connected to the lower end of the support rod (31).

3. The compass according to claim 2, characterized in that: The support rod (31) includes a first rod body (311) and a second rod body (312) distributed vertically. The foot body (32) is connected to the lower end of the second rod body (312). The buckle (30) is set on the second rod body (312). The guide leg (2) is provided with an elastic element (5) that springs upward to press the second rod body (312).

4. The compass according to claim 3, characterized in that: The lower part of the first rod (311) is provided with a limiting hole with a downward opening, and the upper end of the second rod (312) is limited in the limiting hole by being movable up and down; Alternatively, the upper part of the second rod (312) is provided with an upward-opening limiting hole (3121), and the lower end of the first rod (311) is limited in the limiting hole (3121) by moving up and down.

5. The compass according to any one of claims 1 to 4, characterized in that: The corresponding leg (2) is provided with a pressing member (22) that can be inserted into the opening (21).

6. The compass according to any one of claims 1 to 4, characterized in that: The rotary drive mechanism (4) includes a rotating component (41), a linkage component (42), and a connecting rod (43). The rotating component (41) is rotatably sleeved outside the main body (1). The connecting rod (43) is vertically movably limited inside the main body (1). The linkage component (42) is connected to the connecting rod (43) and the rotating component (41). The linkage component (42) moves up and down with the rotation of the rotating component (41) and drives the connecting rod (43) to move up and down. The upper ends of the two gauge feet (3) are rotatably connected to the lower end of the connecting rod (43) in the opening and closing rotation direction.

7. The compass according to claim 6, characterized in that: The inner wall of the rotating component (41) is provided with a spiral step surface (411), the linkage component (42) is vertically moved and limited within the main body (1), the outer wall of the linkage component (42) is provided with a positioning part (421) placed under the spiral step surface (411), and the main body (1) is provided with a guide hole (11) for the positioning part (421) to be inserted vertically.

8. The compass according to claim 6, characterized in that: The upper end of the main body (1) is connected to a cover (6), and the upper end of the cover (6) is formed with a gripping part (61) for hand gripping.

9. The compass according to claim 6, characterized in that: The main body (1) includes an upper section (12) and a lower section (13) that are integrally connected. Both the upper section (12) and the lower section (13) have mounting cavities. A partition (14) is provided between the upper section (12) and the lower section (13) inside the main body (1). The linkage (42) is disposed in the upper section (12), and the connecting rod (43) passes through the partition (14) and is disposed in the upper section (12) and the lower section (13). The lower part of the connecting rod (43) has a boss (431) that can abut against the partition (14). The diameter of the upper section (12) is smaller than that of the lower section (13), and the rotating component (41) is sleeved on the upper section (12) and flush with the outer wall of the lower section (13).

10. The compass according to any one of claims 1 to 4, characterized in that: The upper ends of the two gauge legs (2) are respectively provided with meshing teeth (23) that mesh with each other.

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