A compass

Abstract

The application discloses a compass, which comprises a supporting leg assembly, the supporting leg assembly comprises a compass leg and a telescopic leg, the compass leg is internally provided with a mounting cavity matched with the telescopic leg, the telescopic leg is slidingly mounted in the mounting cavity, the telescopic leg is connected with a locking piece, the locking piece is movably connected with the telescopic leg through the mounting cavity, the locking piece is used for pressing or loosening the telescopic leg, so that the telescopic leg is slidingly locked or unlocked, the telescopic leg and the locking piece are additionally arranged to cooperate with a stepless adjusting mechanism, the length of the supporting leg is flexibly adjusted and firmly locked, and the performance of the compass and the user experience are improved.

Description

Technical Field

[0001] This application relates to the field of stationery technology, and more specifically to a compass. Background Technology

[0002] A compass is a basic drawing tool used to draw circles and arcs. It typically consists of a compass base and two legs. The compass base, located at the top, is the connecting and supporting part of the compass. One leg has a pin for positioning, while the other leg is used to attach a pencil or pen for drawing. The two legs are connected by a hinge point at the top. The radius of the circle is determined by adjusting the distance between the two legs. Traditional compasses have fixed leg lengths, and users can only change the radius by adjusting the angle between the two legs. When drawing larger or smaller circles, users may need to replace the compass with one of different leg lengths, which not only increases cost but also reduces drawing efficiency. Furthermore, compasses with longer legs are generally larger, requiring more space when carrying them and increasing inconvenience. To address the aforementioned issues, Chinese utility model patent CN201721204U discloses a telescopic compass, comprising a handle, a rotating shaft, compass legs, a needle, and a telescopic rod. One end of the telescopic rod is connected to the rotating shaft, and the other end is fitted with a compass leg. The compass leg has a hemispherical protrusion, and the telescopic rod has a circular hole corresponding to the protrusion. In this technical solution, the compass leg can be pulled out directly along the telescopic rod to draw a circle of sufficient radius as needed, or it can be retracted to reduce the length of the compass for easy carrying, solving the drawback of traditional compass legs being unable to adjust their length. However, this telescopic compass uses the hemispherical protrusion and circular hole to fix the length of the leg, which can only be locked at a few preset fixed positions, making continuous length adjustment impossible. Since the number of protrusions and circular holes is limited, and the distance between each fixed position is fixed, the adjustment accuracy is limited, affecting practical use. Summary of the Invention

[0003] The technical problem to be solved by this application is to provide a compass that, by adding telescopic legs and locking components in conjunction with a stepless adjustment mechanism, achieves flexible adjustment and secure locking of the leg length, thereby improving the compass's performance and user experience.

[0004] This application provides a compass, including a support assembly. The support assembly includes a compass leg and a telescopic leg. The compass leg has a mounting cavity adapted to the telescopic leg. The telescopic leg is slidably installed in the mounting cavity. The telescopic leg is connected to a locking member. The locking member passes through the mounting cavity and is movably connected to the telescopic leg. The locking member locks or unlocks the telescopic leg by pressing or releasing it.

[0005] In this technical solution, the compass leg is the main part of the support assembly. It has an internal mounting cavity to accommodate the telescopic leg, which can slide along the cavity to adjust its length. A needle tip or pen tip can be attached to the end of the telescopic leg. The needle tip is used to locate the center on paper, while the pen tip (such as a pencil, fountain pen, or chalk) is used for actual drawing. The mounting cavity is a hollow space inside the compass leg, its shape and size adapted to the telescopic leg to ensure smooth sliding. The telescopic leg can be completely retracted into the compass leg, greatly reducing the overall length of the compass and facilitating carrying and storage. The locking element passes through the mounting cavity and is movably connected to the telescopic leg. The locking element locks the telescopic leg by applying pressure and unlocks it by releasing the pressure. The telescopic leg can slide freely within the mounting cavity. The locking element locks or unlocks the telescopic leg by pressing or releasing it, allowing the user to continuously adjust the length of the support leg within a certain range, achieving stepless adjustment. The locking element can firmly lock the telescopic leg, ensuring that it will not slide during use. It has the advantages of high precision, simple operation, good portability, strong durability and wide applicability, improving the performance of the compass and the user experience.

[0006] As an improvement, a locking block is installed on the telescopic leg. The locking element passes through the telescopic leg and connects to the locking block. The locking element cooperates with the locking block to lock or unlock the telescopic leg. In this technical solution, the locking block installed on the telescopic leg is a key component for fixing the position of the telescopic leg. The locking element can be a screw, button, or other mechanical device, with one end connected to the telescopic leg and the other end cooperating with the locking block. When it is necessary to lock the telescopic leg, the locking element applies pressure through its cooperation with the locking block, fixing the telescopic leg in the current position. When it is necessary to unlock, the locking element releases the pressure, allowing the telescopic leg to slide freely. The cooperation between the locking element and the locking block can accurately fix the position of the telescopic leg, simplifying user operation and improving efficiency.

[0007] As an improvement, the locking element is rotatably connected to the locking block. The locking element, by rotating, causes the locking block to press or release the telescopic leg. In this technical solution, the locking element and the locking block are rotatably connected. The rotation of the locking element controls the pressing or releasing of the locking block. The locking element is typically a rotatable component, including but not limited to knobs, screws, etc., with one end connected to the locking block. By rotating the locking element, the pressure between the locking block and the telescopic leg can be changed. Users can achieve locking and unlocking through simple rotation operations, simplifying user operation and improving efficiency.

[0008] As an improvement, the compass leg is provided with a first sliding groove adapted to the locking member. The first sliding groove communicates with the mounting cavity, and the locking member is slidably connected to the first sliding groove. In this technical solution, the first sliding groove is a channel inside the compass leg, and its shape and size are adapted to the sliding path of the locking member, ensuring that the locking member can slide freely through the first sliding groove without jamming or loosening. The first sliding groove communicates with the mounting cavity, allowing the locking member to pass through the first sliding groove and contact the telescopic leg, thereby realizing the control of the telescopic leg. This ensures that the movement of the telescopic leg is synchronized with the movement of the locking member, improving the accuracy and stability of the adjustment.

[0009] As an improvement, the locking block is provided with a connecting rod, and the telescopic leg is provided with a first through hole for the connecting rod to pass through. The connecting rod passes sequentially through the first through hole and the first sliding groove to connect the locking element. In this technical solution, the locking block is provided with a connecting rod, which is used to connect the locking block and the locking element. One end of the connecting rod is fixed to the locking block, and the other end is used to rotatably connect to the locking element. The shape and size of the first through hole are adapted to the connecting rod to ensure that the connecting rod can pass through smoothly. The position and direction of the first through hole are aligned with the first sliding groove, so that the connecting rod can pass through smoothly and connect to the locking element, ensuring a stable connection between the locking block and the locking element, while allowing the locking element to slide through the first sliding groove.

[0010] As an improvement, this application provides a specific mating structure between a locking element and a locking block, wherein the locking element is threadedly connected to the connecting rod. In this technical solution, the connection between the locking element and the connecting rod is threaded. By rotating the locking element, it can be moved on the connecting rod. The user can precisely control the position of the locking element on the connecting rod, thereby achieving the pressing or releasing of the telescopic leg. When the locking element is tightened, the locking block presses the telescopic leg, fixing the telescopic leg in its current position. When the locking element is loosened, the locking block releases the telescopic leg, allowing the telescopic leg to slide freely. The user can precisely adjust the degree of fixation of the telescopic leg as needed, simplifying user operation and improving efficiency. The threaded connection design of the locking element and connecting rod ensures stability and reliability during long-term use.

[0011] As an improvement, this application can provide another specific mating structure between the locking element and the locking block, wherein a rotating shaft is mounted on the connecting rod, and the locking element is connected to the rotating shaft to be rotatably mounted on the connecting rod. In this technical solution, the rotating shaft is a component fixed on the connecting rod, and its function is to provide a center of rotation, allowing the locking element to rotate around the rotating shaft, ensuring smooth and precise rotational movement of the locking element. By rotating the locking element, the pressure between the locking element and the locking block can be changed. Users can achieve locking and unlocking through simple rotation operations, simplifying user operation and improving efficiency.

[0012] As an improvement, the locking block has an arc-shaped abutment surface. The locking block rotates to bring this arc-shaped abutment surface into contact with the compass leg surface, thus pressing the telescopic leg together for sliding locking. Reverse rotation of the locking block disengages the arc-shaped abutment surface from the compass leg surface, releasing the telescopic leg and unlocking it. In this technical solution, the locking block has an arc-shaped abutment surface designed to fit the compass leg surface, allowing the locking block to tightly abut against the compass leg surface during rotation, effectively pressing the telescopic leg and locking it in its current position. Reverse rotation of the locking block gradually disengages the arc-shaped abutment surface from the compass leg surface, releasing pressure and allowing the telescopic leg to slide freely. Users can quickly adjust the length of the telescopic leg and lock it securely when needed, without complicated operating procedures. More preferably, the locking block is provided with a wrench portion, which is used for the user to apply force to rotate the locking block. By applying force to rotate the locking block with the wrench portion, the arc-shaped contact surface abuts against or disengages from the surface of the compass leg, thereby improving the convenience of user operation.

[0013] As an improvement, the compass leg is provided with a second sliding groove adapted to the locking block. The second sliding groove communicates with the mounting cavity, and the locking block is slidably installed within the second sliding groove. The second sliding groove is used to limit the sliding range of the locking block. In this technical solution, the shape and size of the second sliding groove are adapted to the locking block, ensuring that the locking block can slide freely within the second sliding groove, ensuring a smooth and uninterrupted sliding process. The second sliding groove communicates with the mounting cavity, allowing the locking block to pass through the second sliding groove and connect with the telescopic leg. The sliding range of the locking block is determined by the length and position of the second sliding groove, thereby ensuring that the locking block will not exceed the predetermined position during sliding. The user can precisely control the extension and retraction of the telescopic leg by sliding the locking block, preventing the telescopic leg from disengaging from the mounting cavity during sliding and improving the reliability of use.

[0014] As an improvement, the first and second slide grooves are arranged opposite each other on the compass leg. In this technical solution, the first and second slide grooves are located on opposite sides of the compass leg. The first slide groove is used for the sliding of the locking element, and the second slide groove is used for the sliding of the locking block. The opposite arrangement ensures that the movements of the locking element and the locking block do not interfere with each other, improving the stability and reliability of the operation. It also allows the locking element and the locking block to be connected in a straight line, ensuring synchronous movement during sliding and improving locking reliability and locking efficiency. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the support leg assembly in Embodiment 2 of this application.

[0016] Figure 2 This is an exploded view of the support assembly in Embodiment 2 of this application.

[0017] Figure 3This is a three-dimensional structural diagram of the support leg assembly in Embodiment 3 of this application.

[0018] Figure 4 This is an exploded view of the support assembly in Embodiment 3 of this application.

[0019] The figure shows: 1. Compass leg; 11. Mounting cavity; 12. First slide groove; 13. Second slide groove; 2. Telescopic leg; 21. First through hole; 3. Locking element; 31. Arc-shaped contact surface; 32. Wrench part; 4. Locking block; 41. Connecting rod; 42. Rotating shaft. Detailed Implementation

[0020] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0021] In the accompanying drawings, the thickness, size, and shape of the objects have been slightly exaggerated for illustrative purposes. The drawings are for illustrative purposes only and are not drawn to scale.

[0022] It should also be understood that the terms "comprising," "including," "having," "containing," and "including," when used in this specification, indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof. The terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (the specific types and constructions may be the same or different), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0023] Furthermore, it should be noted that the terms "installation," "setting," "equipped with," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components; they can refer to a direct installation on another component or the possible presence of another intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] Example 1 like Figures 1 to 4 As shown, this application discloses a compass, including a support assembly. The support assembly includes a compass leg 1 and a telescopic leg 2. The compass leg 1 has a mounting cavity 11 adapted to the telescopic leg 2. The telescopic leg 2 is slidably mounted in the mounting cavity 11. The telescopic leg 2 is connected to a locking member 3, which passes through the mounting cavity 11 and is movably connected to the telescopic leg 2. The locking member 3 locks or unlocks the telescopic leg 2 by pressing or releasing it. The compass leg 1 is the main part of the support assembly, and has a mounting cavity 11 inside to accommodate the telescopic leg 2. The telescopic leg 2 can slide along the mounting cavity 11 to achieve length adjustment. A needle tip or pen tip can be installed at the end of the telescopic leg 2. The needle tip is used to locate the center of the circle on paper, while the pen tip (such as a pencil, fountain pen, or chalk) is used for actual drawing. The mounting cavity 11 is a hollow cavity inside the compass leg 1. Its shape and size are adapted to the telescopic leg 2, ensuring that the telescopic leg 2 can slide smoothly within it. The telescopic leg 2 can be completely retracted into the compass leg 1, greatly reducing the overall length of the compass, making it easy to carry and store. The locking member 3 passes through the mounting cavity 11 and is movably connected to the telescopic leg 2. The locking member 3 locks the telescopic leg 2 by applying pressure and unlocks it by releasing the pressure. The telescopic leg 2 can slide freely within the mounting cavity 11. The locking member 3 locks or unlocks the telescopic leg 2 by pressing or releasing it, allowing the user to continuously adjust the length of the legs within a certain range, achieving stepless adjustment. The locking member 3 can firmly lock the telescopic leg 2, ensuring that the telescopic leg 2 will not slide during use. It has the advantages of high precision, simple operation, good portability, strong durability and wide applicability, improving the performance of the compass and the user experience.

[0025] More specifically, such as Figures 1 to 4As shown, a locking block 4 is installed on the telescopic leg 2. A locking element 3 passes through the telescopic leg 2 and connects to the locking block 4. The locking element 3 cooperates with the locking block 4 to lock or unlock the telescopic leg 2. The locking block 4 is a key component for fixing the position of the telescopic leg 2. The locking element 3 can be a screw, button, or other mechanical device. One end of the locking element 3 is connected to the telescopic leg 2, and the other end cooperates with the locking block 4. When it is necessary to lock the telescopic leg 2, the locking element 3 applies pressure through its cooperation with the locking block 4 to fix the telescopic leg 2 in the current position. When it is necessary to unlock, the locking element 3 releases the pressure, allowing the telescopic leg 2 to slide freely. The cooperation between the locking element 3 and the locking block 4 can accurately fix the position of the telescopic leg 2, simplifying user operation and improving usage efficiency.

[0026] More specifically, such as Figures 1 to 4 As shown, locking element 3 is rotatably connected to locking block 4. By rotating, locking element 3 causes locking block 4 to press or release telescopic leg 2. Locking element 3 and locking block 4 are rotatably connected. The rotation of locking element 3 can control the pressing or releasing of locking block 4. Locking element 3 is usually a rotatable component, including but not limited to knobs, screws, etc., one end of which is connected to locking block 4. By rotating locking element 3, the pressure between locking block 4 and telescopic leg 2 can be changed. Users can lock and unlock by simple rotation operation, which simplifies user operation and improves usage efficiency.

[0027] More specifically, such as Figures 2 to 4 As shown, the compass leg 1 is provided with a first slide groove 12 that is adapted to the locking member 3. The first slide groove 12 is connected to the mounting cavity 11. The locking member 3 is slidably connected to the first slide groove 12. The first slide groove 12 is a channel inside the compass leg 1. Its shape and size are adapted to the sliding path of the locking member 3, ensuring that the locking member 3 can slide freely through the first slide groove 12 without jamming or loosening. The first slide groove 12 is connected to the mounting cavity 11, so that the locking member 3 can pass through the first slide groove 12 and contact the telescopic leg 2, thereby realizing the control of the telescopic leg 2. This ensures that the movement of the telescopic leg 2 is synchronized with the movement of the locking member 3, improving the accuracy and stability of the adjustment.

[0028] More specifically, such as Figure 2 and Figure 4As shown, the locking block 4 is provided with a connecting rod 41, and the telescopic leg 2 is provided with a first through hole 21 for the connecting rod 41 to pass through. The connecting rod 41 passes through the first through hole 21 and the first sliding groove 12 in sequence to connect the locking member 3. The locking block 4 is provided with a connecting rod 41, which is used to connect the locking block 4 and the locking member 3. One end of the connecting rod 41 is fixed on the locking block 4, and the other end is used to rotate and connect the locking member 3. The shape and size of the first through hole 21 are adapted to the connecting rod 41 to ensure that the connecting rod 41 can pass through smoothly. The position and direction of the first through hole 21 are aligned with the first sliding groove 12, so that the connecting rod 41 can pass through smoothly and connect the locking member 3, ensuring a stable connection between the locking block 4 and the locking member 3, while allowing the locking member 3 to slide through the first sliding groove 12.

[0029] More specifically, such as Figure 1 , Figure 2 and Figure 4 As shown, the compass leg 1 is provided with a second slide groove 13 adapted to the locking block 4. The second slide groove 13 is connected to the mounting cavity 11. The locking block 4 is slidably installed in the second slide groove 13. The second slide groove 13 is used to limit the sliding range of the locking block 4. The shape and size of the second slide groove 13 are adapted to the locking block 4 to ensure that the locking block 4 can slide freely in the second slide groove 13, ensuring that the sliding process is smooth and without jamming. The second slide groove 13 is connected to the mounting cavity 11, so that the locking block 4 can pass through the second slide groove 13 and connect with the telescopic leg 2. The sliding range of the locking block 4 is determined by the length and position of the second slide groove 13, thereby ensuring that the locking block 4 will not exceed the predetermined position during the sliding process. The user can precisely control the extension and retraction of the telescopic leg 2 by sliding the locking block 4, preventing the telescopic leg 2 from disengaging from the mounting cavity 11 during the sliding process, and improving the reliability of use.

[0030] More specifically, such as Figures 1 to 4 As shown, the first slide groove 12 and the second slide groove 13 are arranged opposite to each other on the compass leg 1. The first slide groove 12 and the second slide groove 13 are located on both sides of the compass leg 1. The first slide groove 12 is used for the sliding of the locking member 3, and the second slide groove 13 is used for the sliding of the locking block 4. The opposite arrangement ensures that the movements of the locking member 3 and the locking block 4 do not interfere with each other, improves the stability and reliability of the operation, and enables the locking member 3 and the locking block 4 to be connected in a straight line, ensuring that they maintain synchronous movement during the sliding process, improving the locking reliability and locking efficiency.

[0031] Example 2 like Figure 1 and Figure 2As shown, this embodiment provides a compass based on Embodiment 1, with the same structure. The locking member 3 is threadedly connected to the connecting rod 41. The connection between the locking member 3 and the connecting rod 41 is threaded. By rotating the locking member 3, it can move on the connecting rod 41. The user can precisely control the position of the locking member 3 on the connecting rod 41, thereby achieving the pressing or releasing of the telescopic leg 2. When the locking member 3 is tightened, the locking block 4 presses the telescopic leg 2, fixing the telescopic leg 2 in its current position. When the locking member 3 is loosened, the locking block 4 releases the telescopic leg 2, allowing it to slide freely. The user can precisely adjust the degree of fixation of the telescopic leg 2 as needed, simplifying user operation and improving efficiency. The threaded connection between the locking member 3 and the connecting rod 41 ensures stability and reliability during long-term use.

[0032] Example 3 like Figure 3 and Figure 4 As shown, this embodiment provides a compass based on embodiment 1, with the same structure as embodiment 1. A rotating shaft 42 is mounted on the connecting rod 41. The locking member 3 is connected to the rotating shaft 42 and rotatably mounted on the connecting rod 41. The rotating shaft 42 is a component fixed to the connecting rod 41, providing a center of rotation so that the locking member 3 can rotate around the rotating shaft 42, ensuring smooth and precise rotation of the locking member 3. By rotating the locking member 3, the pressure between the locking member 3 and the locking block 4 can be changed. Users can achieve locking and unlocking through simple rotation operations, simplifying user operation and improving efficiency.

[0033] More specifically, such as Figure 3 and Figure 4 As shown, the locking block 4 has an arc-shaped abutment surface 31. The locking block 4 rotates to make the arc-shaped abutment surface 31 abut against the surface of the compass leg 1, thereby pressing the telescopic leg 2 to achieve sliding locking. The locking block 4 rotates in the opposite direction to disengage the arc-shaped abutment surface 31 from the surface of the compass leg 1, thereby releasing the telescopic leg 2 to achieve sliding unlocking. The arc-shaped abutment surface 31 of the locking block 4 is designed to fit the surface of the compass leg 1, allowing the locking block 4 to tightly abut against the surface of the compass leg 1 during rotation, thus effectively pressing the telescopic leg 2. This allows the telescopic leg 2 to slide and lock, fixing it in its current position. The locking block 4 rotates in the opposite direction, causing the arc-shaped contact surface 31 to gradually disengage from the surface of the compass leg 1, releasing pressure and allowing the telescopic leg 2 to slide freely. Users can quickly adjust the length of the telescopic leg 2 and lock it securely when needed, without complicated operating procedures. The locking block 4 is equipped with a wrench part 32, which allows the user to apply force to rotate the locking block 4. By applying force to rotate the locking block 4 through the wrench part 32, the arc-shaped contact surface 31 can be made to contact or disengage from the surface of the compass leg 1, improving the convenience of user operation.

[0034] This application is not limited to the above-described preferred embodiments. Anyone can derive other products in various forms under the guidance of this application. However, regardless of any changes made to their shape or structure, any technical solution that is the same as or similar to that of this application falls within the protection scope of this application.

Claims

1. A compass, comprising a support assembly, characterized in that, The support assembly includes a compass leg (1) and a telescopic leg (2). The compass leg (1) has a mounting cavity (11) adapted to the telescopic leg (2). The telescopic leg (2) is slidably installed in the mounting cavity (11). The telescopic leg (2) is connected to a locking member (3). The locking member (3) passes through the mounting cavity (11) and is movably connected to the telescopic leg (2). The locking member (3) locks or unlocks the telescopic leg (2) by pressing or releasing it.

2. A compass according to claim 1, characterized in that, The telescopic leg (2) is equipped with a locking block (4), and the locking member (3) passes through the telescopic leg (2) and connects to the locking block (4). The locking member (3) cooperates with the locking block (4) to slide and lock or unlock the telescopic leg (2).

3. A compass according to claim 2, characterized in that, The locking member (3) is rotatably connected to the locking block (4), and the locking member (3) causes the locking block (4) to press or release the telescopic leg (2) by rotating.

4. A compass according to claim 3, characterized in that, The compass leg (1) is provided with a first slide groove (12) that is adapted to the locking member (3). The first slide groove (12) is connected to the mounting cavity (11), and the locking member (3) is slidably connected to the first slide groove (12).

5. A compass according to claim 4, characterized in that, The locking block (4) is provided with a connecting rod (41), and the telescopic leg (2) is provided with a first through hole (21) through which the connecting rod (41) passes. The connecting rod (41) passes through the first through hole (21) and the first slide groove (12) in sequence to connect the locking member (3).

6. A compass according to claim 5, characterized in that, The locking element (3) is threadedly connected to the connecting rod (41).

7. A compass according to claim 5, characterized in that, A rotating shaft (42) is mounted on the connecting rod (41), and the locking member (3) is connected to the rotating shaft (42) to be rotatably mounted on the connecting rod (41).

8. A compass according to claim 7, characterized in that, The locking block (4) is provided with an arc-shaped contact surface (31). The locking block (4) rotates to make the arc-shaped contact surface (31) abut against the surface of the compass leg (1) so that the locking block (4) presses the telescopic leg (2) to achieve sliding locking. The locking block (4) rotates in the opposite direction to make the arc-shaped contact surface (31) disengage from the surface of the compass leg (1) so that the locking block (4) releases the telescopic leg (2) to achieve sliding unlocking.

9. A compass according to claim 4, characterized in that, The compass leg (1) is provided with a second slide groove (13) that is adapted to the locking block (4). The second slide groove (13) is connected to the mounting cavity (11). The locking block (4) is slidably installed in the second slide groove (13). The second slide groove (13) is used to limit the sliding range of the locking block (4).

10. A compass according to claim 9, characterized in that, The first groove (12) and the second groove (13) are arranged on opposite sides on the compass leg (1).

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