Compasses capable of automatically storing central needle

Abstract

The utility model relates to the technical field of compasses, in particular to a pair of compasses capable of automatically storing a central needle, which comprises a fixed foot and a rotating foot, the top ends of the fixed foot and the rotating foot are rotatably connected, the bottom end of the fixed foot is provided with an inner groove, and a needle head assembly is mounted in the inner groove and comprises a pressing rod. A retreating groove is formed in one side of the middle of the pressing rod, an elastic clamping rod is installed at the retreating groove, a lower clamping opening is formed in the lower portion of one side of the inner groove and matched with the elastic clamping rod in a clamped mode, a fixing piece is installed at the position, close to the elastic clamping rod, of the rotating foot, and a driving column is slidably arranged in the middle of the fixing piece. According to the compasses capable of automatically storing the center needle, through ingenious mechanical design, the automatic storage function of the center needle is achieved. After the compasses are used, the needle head assembly can be automatically driven to retract only by simply closing the fixed foot and the rotating foot, manual operation is not needed, and the storage process is greatly simplified.

Description

Technical Field

[0001] This utility model relates to the field of compass technology, specifically to a compass that automatically stores the center needle. Background Technology

[0002] In the use of a compass, the center pin plays a crucial role in positioning and support, making it an indispensable component. However, traditional compasses have some design and usage issues, particularly regarding the storage of the center pin.

[0003] Traditional compasses typically have their center pin fixed to one end of the legs. After use, users need to manually retract the center pin or take additional protective measures to prevent accidental injury or damage to other objects. This manual retraction method is not only cumbersome but also prone to hand injuries, especially in situations requiring frequent use of compasses, such as teaching or drawing.

[0004] Furthermore, the exposed center pin of a traditional compass increases its overall size and space requirements, making it inconvenient to carry and store. Additionally, the exposed center pin is more susceptible to environmental contamination and damage, affecting the compass's lifespan and accuracy. Utility Model Content

[0005] The purpose of this invention is to provide a compass with an automatic center pin storage mechanism to solve the problem mentioned in the background art that the center pin of a traditional compass is usually fixed at one end of the leg, and after use, the user needs to manually retract the center pin or take additional protective measures to prevent the center pin from accidentally pricking people or damaging other items.

[0006] To achieve the above objectives, this utility model provides a compass for automatically storing a center needle, comprising a fixed foot and a rotating foot, the top ends of which are rotatably connected. The bottom end of the fixed foot has an inner groove, inside which a needle assembly is installed. The needle assembly includes a pressing rod, a retraction groove on one side of the middle portion of the pressing rod, and an elastic locking rod installed in the retraction groove. A lower locking slot is provided on the lower part of one side of the inner groove, engaging with the elastic locking rod. A fixing member is installed on the rotating foot near the elastic locking rod, and a driving column is slidably disposed in the middle of the fixing member. When the fixed foot and the rotating foot are closed, the rotating foot acts on the driving column, thereby causing the elastic locking rod to disengage from the lower locking slot, causing the needle assembly to retract.

[0007] Preferably, a needle rod is installed at the lower part of the pressing rod, a spring is sleeved on the outside of the needle rod, and a center needle is installed at the bottom end of the needle rod.

[0008] Preferably, a button is mounted on the top of the pressing rod.

[0009] Preferably, the outer side of the fixing member is provided with a locking block, the lower inner side of the rotating foot is provided with an inner cavity, the inner wall of the inner cavity is provided with a locking groove, and the locking block and the locking groove are engaged.

[0010] Preferably, the fixing member has a horizontal hole near the drive column, and the drive column passes through the horizontal hole.

[0011] Preferably, an upper latch is provided on the upper part of one side of the inner groove, and when the needle assembly retracts, the elastic latch engages with the upper latch.

[0012] Preferably, the lower part of the outer wall of the elastic lever is provided with a slope. When the needle assembly is pressed, the elastic lever disengages from the upper latch through the slope and then latches into the lower latch.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This invention utilizes a clever mechanical design to automatically retract the center needle in a compass. After use, simply closing the fixing leg and rotating the rotating leg automatically retracts the needle assembly, eliminating the need for manual operation and greatly simplifying the storage process. This automatic retraction design not only improves efficiency but also avoids the risk of hand injury that may occur during manual storage.

[0015] The automatic center pin storage effectively prevents accidental injury or damage to other objects from the center pin during carrying, storage, or use, thus improving the compass's safety. This reliable design is particularly important in situations requiring frequent use of compasses, such as teaching or drawing. The automatic center pin storage also significantly reduces the overall size and space occupied by the compass during carrying and storage, making it much easier to carry and store. This design not only makes it convenient for users to carry and use but also enhances the compass's portability and practicality.

[0016] The automatic center pin retraction function effectively prevents contamination and damage that may occur when the center pin is exposed, thus protecting its accuracy and lifespan. This protective design ensures that the compass maintains stable performance and accuracy during long-term use, meeting the user's needs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is one of the partial structural schematic diagrams of this utility model;

[0019] Figure 3This is the second partial structural schematic diagram of the present utility model;

[0020] Figure 4 This is the third partial structural schematic diagram of this utility model;

[0021] The meanings of the labels in the diagram are as follows:

[0022] 1. Fixed foot; 11. Inner groove; 12. Upper bayonet; 13. Lower bayonet; 2. Rotating foot; 3. Needle assembly; 31. Pressing rod; 311. Retraction groove; 312. Elastic locking rod; 32. Needle rod; 33. Spring; 34. Center needle; 35. Button; 4. Fixing component; 41. Locking block; 42. Drive column. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] This utility model provides a compass that automatically stores the center pin, such as... Figures 1-4 As shown, the device includes a fixed foot 1 and a rotating foot 2, with their top ends rotatably connected. The bottom end of the fixed foot 1 has an inner groove 11, inside which a needle assembly 3 is installed. The needle assembly 3 includes a pressing rod 31, with a retraction groove 311 on one side of the middle portion of the pressing rod 31. An elastic locking rod 312 is installed at the retraction groove 311. A lower locking slot 13 is located on the lower part of one side of the inner groove 11, engaging with the elastic locking rod 312. A fixing member 4 is installed on the rotating foot 2 near the elastic locking rod 312, with a driving column 42 slidably mounted in the middle of the fixing member 4. When the fixed foot 1 and the rotating foot 2 are closed, the rotating foot 2 acts on the driving column 42, causing the elastic locking rod 312 to disengage from the lower locking slot 13, thus retracting the needle assembly 3. Through this ingenious structural design, the automatic retraction function of the central needle is achieved. When the fixed foot 1 and the rotating foot 2 are closed, the fixing member 4 on the rotating foot 2 acts on the drive column 42. The movement of the drive column 42 causes the elastic locking rod 312 mounted on the pressing rod 31 to disengage from the lower locking slot 13 at the bottom of the inner groove 11. This design allows the needle assembly 3 to automatically retract after losing the support of the lower locking slot 13, eliminating the need for manual operation and greatly improving the convenience and safety of compass use. This technology not only simplifies the storage process of the center needle but also effectively avoids accidental injuries that may be caused by manual storage, making the compass safer and more reliable during carrying, storage, and use.

[0025] In this embodiment, a needle rod 32 is mounted on the lower part of the pressing rod 31, a spring 33 is sleeved on the outside of the needle rod 32, and a center needle 34 is mounted on the bottom end of the needle rod 32. This design realizes the structured assembly of the needle assembly 3, making the pressing rod 31, needle rod 32, spring 33, and center needle 34 fit together tightly. The sleeve of the spring 33 provides elastic support for the needle rod 32 and center needle 34 during retraction and extension, ensuring that the center needle 34 can be stably extended for drawing when needed, and can be smoothly retracted when not needed, improving the ease of use and safety of the compass.

[0026] Specifically, a button 35 is mounted on the top of the pressing lever 31. The installation of button 35 provides the user with an intuitive and easy-to-operate interface, allowing the user to control the extension and retraction of the needle assembly 3 by simply pressing button 35. This design not only improves the human-computer interaction of the compass but also makes operation simpler and faster.

[0027] Furthermore, a locking block 41 is provided on the outer side of the fixing member 4, and an inner cavity is provided on the lower inner side of the rotating foot 2. A slot is provided on the inner wall of the inner cavity, and the locking block 41 engages with the slot. The engagement of the locking block 41 with the slot achieves a stable connection between the fixing member 4 and the rotating foot 2. This design ensures the stable installation of the fixing member 4 on the rotating foot 2, provides reliable support for the sliding of the drive column 42, and thus ensures the stability and accuracy of the needle assembly 3 during the retraction process.

[0028] Furthermore, a horizontal hole is provided on the fixing member 4 near the drive column 42, and the drive column 42 passes through the horizontal hole. The design of the horizontal hole provides a precise sliding track for the drive column 42, ensuring the stable sliding of the drive column 42 within the fixing member 4. This design not only improves the sliding efficiency of the drive column 42, but also ensures its accurate action on the elastic lever 312 during sliding, thereby achieving reliable retraction of the needle assembly 3.

[0029] Furthermore, an upper latch 12 is provided on the upper part of one side of the inner groove 11. When the needle assembly 3 retracts, the elastic latch 312 engages with the upper latch 12. The design of the upper latch 12 provides a stable engagement point for the needle assembly 3 during retraction. When the needle assembly 3 retracts, the engagement between the elastic latch 312 and the upper latch 12 ensures the stability of the needle assembly 3 in the retracted state, preventing it from accidentally extending during carrying or storage, and improving the safety of the compass.

[0030] Furthermore, the lower part of the outer wall of the elastic locking lever 312 is provided with a slope. When the needle assembly 3 is pressed, the elastic locking lever 312 disengages from the upper locking slot 12 through the slope and then engages with the lower locking slot 13. The sloped design allows the elastic locking lever 312 to smoothly disengage from the upper locking slot 12 and engage with the lower locking slot 13 when the needle assembly 3 is pressed. This design not only simplifies the extension and retraction process of the needle assembly 3, but also improves its operational smoothness and reliability, making the use of the compass more convenient and efficient.

[0031] When using the automatic center needle storage compass of this utility model, the compass is first in the open state, with the fixed foot 1 and the rotating foot 2 separated. Under the elastic force of the spring 33, the needle assembly 3 is kept in the extended state through the engagement of the elastic lever 312 and the lower locking slot 13, and the center needle 34 is exposed, ready for drawing.

[0032] The user holds the fixed foot 1 and the rotating foot 2, and places the center pin 34 on the drawing paper at the desired position as the center of the circle. Rotating the rotating foot 2 causes the other foot of the compass (not shown, usually the drawing pencil or ink line foot) to rotate around the center pin 34, thus drawing a circle.

[0033] After the drawing is completed, the user closes the fixed foot 1 and the rotating foot 2. During the closing process, the fixing part 4 on the rotating foot 2 gradually approaches the elastic locking rod 312 on the pressing rod 31. The driving column 42 in the fixing part 4 pushes the elastic locking rod 312 under the closing action of the rotating foot 2. Under the push of the driving column 42, the inclined surface of the lower part of the outer wall of the elastic locking rod 312 contacts the upper locking slot 12 and gradually slips away, causing the elastic locking rod 312 to disengage from the lower locking slot 13. After losing the support of the lower locking slot 13, the needle assembly 3 automatically retracts under the elastic force of the spring 33, and the central needle 34 is retracted into the inner groove 11.

[0034] During the retraction of the needle assembly 3, the elastic lever 312 continues to move and eventually engages with the upper latch 12. The engagement between the upper latch 12 and the elastic lever 312 ensures the stability of the needle assembly 3 in the retracted state and prevents it from accidentally extending during carrying or storage.

[0035] When the compass needs to be used again, the user simply presses the button 35 at the top of the pressing lever 31. Pressing the button 35 causes the pressing lever 31 to move downwards, causing the inclined surface of the elastic locking lever 312 to slide off the upper locking slot 12 and engage with the lower locking slot 13. At the same time, the needle assembly 3 extends out under the push of the pressing lever 31, overcoming the elastic force of the spring 33, and the center needle 34 re-exposes, ready for the next drawing.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A compass with automatic centering of the needle, comprising a fixed leg (1) and a rotating leg (2), characterized in that: The top end of the fixed foot (1) and the rotating foot (2) is rotatably connected, the bottom end of the fixed foot (1) is provided with an inner groove (11), the inner groove (11) is internally provided with a needle assembly (3), the needle assembly (3) comprises a pressing rod (31), one side of the middle part of the pressing rod (31) is provided with a back-off groove (311), the back-off groove (311) is provided with an elastic clamping rod (312), the lower part of one side of the inner groove (11) is provided with a lower clamping port (13), the lower clamping port (13) is clamped and matched with the elastic clamping rod (312), the rotating foot (2) is provided with a fixing piece (4) near the elastic clamping rod (312), the middle part of the fixing piece (4) is slidably provided with a driving column (42), when the fixed foot (1) and the rotating foot (2) are closed, the rotating foot (2) acts on the driving column (42), so that the elastic clamping rod (312) is separated from the lower clamping port (13), and the needle assembly (3) is retracted.

2. The automatic centering needle compass of claim 1, wherein: The lower part of the pressing rod (31) is provided with a needle rod (32), the outer part of the needle rod (32) is provided with a spring (33), and the bottom end of the needle rod (32) is provided with a center needle (34).

3. The automatic centering needle compass of claim 1, wherein: The top end of the pressing rod (31) is provided with a button (35).

4. The automatic centering needle compass of claim 1, wherein: The outer side of the fixing piece (4) is provided with a clamping block (41), the lower part of the rotating foot (2) is provided with an inner cavity, and the inner wall of the inner cavity is provided with a clamping groove, the clamping block (41) is clamped and matched with the clamping groove.

5. The automatic centering needle compass of claim 1, wherein: The fixing piece (4) is provided with a horizontal hole near the driving column (42), and the driving column (42) penetrates in the horizontal hole.

6. The automatic centering needle compass of claim 1, wherein: The upper part of one side of the inner groove (11) is provided with an upper clamping port (12), when the needle assembly (3) is retracted, the elastic clamping rod (312) is clamped and matched with the upper clamping port (12).

7. The automatic centering needle compass of claim 6, wherein: The lower part of the outer wall of the elastic clamping rod (312) is provided with an inclined surface, when the needle assembly (3) is pressed, the elastic clamping rod (312) is separated from the upper clamping port (12) through the inclined surface, and then is clamped into the lower clamping port (13).

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