Hand-drawn mechanical drafting industrial design ruler

Abstract

The application discloses a hand-drawing mechanical drawing industrial design ruler plate and belongs to the technical field of drawing equipment, which comprises a main ruler plate, a first mounting groove, a second jack, a first scale bar, a second mounting groove and a plug-in strip. The first mounting groove is arranged in the main ruler plate. The second jacks are arranged at the right end of the main ruler plate and are in communication with the first mounting groove. The first scale bar is arranged at the front end of the main ruler plate. The second mounting groove is arranged at the rear end of the main ruler plate. The plug-in strip is arranged in the second mounting groove. The one-way rotation of the ratchet wheel is realized through the cooperation of the ratchet wheel and the pawl, the left movement of the connecting plate is prevented, the drawing of longer lines is more convenient, the drawing of inclined lines is facilitated through the rotation of the auxiliary ruler plate, the auxiliary ruler plate is moved through the movement of the sliding block, the drawing convenience is further optimized, and the diversity of drawing is met.

Description

Technical Field

[0001] This invention relates to the field of drafting equipment technology, and more specifically, to a hand-drawn mechanical drafting industrial design ruler. Background Technology

[0002] Industrial drafting is a course with strict requirements for drawing. In the teaching of mechanical design or industrial design in major colleges and universities, manual drafting is still an important course, mainly to teach students geometric drawing methods and drafting principles. Moreover, in my country's old industrial bases, many veteran engineers still use manual drafting.

[0003] Existing technologies disclose some patent documents for drafting tools. Chinese patent application number CN201921997967.6 discloses a drafting tool for industrial design. By setting a drafting table with multiple foldable parts on a support base, the drafting table can be folded, making it suitable for drawings of various sizes and easy to carry. By setting a pressure plate and a pressure block on the drafting table, the drawings can be fixed and flattened during the drafting process, preventing the drawings from sliding or curling and affecting the drafting effect, thus facilitating drafting.

[0004] The aforementioned patents contain drawing rulers with limited functionality and poor ease of use, making it difficult to meet the diverse needs of drawing. Therefore, we propose a hand-drawn mechanical drawing industrial design ruler. Summary of the Invention

[0005] 1. Technical problems to be solved To address the problems existing in the prior art, the purpose of this invention is to provide a hand-drawn mechanical drawing industrial design ruler. This invention uses the cooperation of a ratchet and a pawl to make the ratchet rotate in one direction, preventing the connecting plate from moving to the left, thus making it more convenient to draw longer lines. At the same time, the rotation of the secondary ruler facilitates the drawing of diagonal lines, and the movement of the slider can drive the movement of the secondary ruler, further optimizing the convenience of drawing and thus meeting the diversity of drawing and drafting.

[0006] 2. Technical Solution To solve the above problems, the present invention adopts the following technical solution: A hand-drawn mechanical drawing and industrial design ruler includes: Master scale plate; The first mounting slot is formed inside the main scale plate; The second socket is located at the right end of the main plate and is connected to the first mounting slot. The first scale bar is installed at the front end of the main scale plate; The second mounting slot is located at the rear end of the main scale plate; A plug strip, which is slidably connected to the second socket; A connecting plate, which is fixedly connected to the right end of the insert; A secondary ruler plate is movably inserted into a second mounting slot, and two second scale strips are installed at the front end of the second mounting slot. The third rotating rod is fixedly connected to the front end of the auxiliary ruler plate; The self-locking mechanism is located inside the main scale plate and is connected to the connecting plate. A positioning mechanism is installed inside the main ruler plate and is connected to the third rotating rod.

[0007] In a preferred embodiment of the present invention, the self-locking mechanism includes a transmission component and a self-locking component, both of which are disposed within the main scale plate and are connected to each other.

[0008] As a preferred embodiment of the present invention, the transmission assembly includes a first insertion hole, a rack, a first rotating rod, and a gear. The first insertion hole is located at the right end of the main scale plate. The rack is fixedly connected to the left end of the connecting plate and is movably inserted into the first insertion hole. The first rotating rod is rotatably connected between the front and rear inner walls of the main scale plate. The gear is fixedly connected to the surface of the first rotating rod and meshes with the rack.

[0009] In a preferred embodiment of the present invention, the self-locking assembly includes a ratchet, a second rotating rod, a pawl, a rotating plate, a first spring, and a fixed plate. The ratchet is fixedly connected to the surface of the first rotating rod, the second rotating rod is rotatably connected to the main scale plate, and the front end of the second rotating rod moves through the main scale plate. The pawl is fixedly connected to the surface of the second rotating rod and meshes with the ratchet. The rotating plate is fixedly connected to the front end of the second rotating rod, the first spring is fixedly connected to the lower end of the rotating plate, and the fixed plate is fixedly connected to the front end of the main scale plate, with the upper end of the fixed plate fixedly connected to the rotating plate.

[0010] In a preferred embodiment of the present invention, the positioning mechanism includes a sliding component, a positioning component, and a limiting component. The sliding component, the positioning component, and the limiting component are all disposed within the main ruler plate. The sliding component is connected to the positioning component, and the positioning component is connected to the limiting component.

[0011] In a preferred embodiment of the present invention, the sliding assembly includes a first sliding hole, a second sliding hole, a limiting groove, a slider, a limiting plate, and a push plate. The first sliding hole is opened at the front end of the main scale plate, and the second sliding hole is opened in the second mounting groove. There are two limiting grooves and two limiting plates. The two limiting grooves are respectively opened on the upper and lower inner walls of the second sliding hole. The slider is slidably connected in the first sliding hole and the second sliding hole. The two limiting plates are respectively fixedly connected to the upper and lower ends of the slider, and the two limiting plates are respectively slidably connected in the two limiting grooves. The push plate is fixedly connected to the front end of the slider.

[0012] In a preferred embodiment of the present invention, the positioning component includes a cross groove, a third mounting groove, a cross insert rod, and a second spring. The cross groove is formed at the front end of the third rotating rod, the third mounting groove is formed inside the slider, the third rotating rod is rotatably connected to the third mounting groove, the cross insert rod is slidably connected to the third mounting groove, and the cross insert rod is movably inserted into the cross groove. The second spring is fixedly connected between the cross insert rod and the third mounting groove.

[0013] As a preferred embodiment of the present invention, the limiting component includes a traction rope, a hanging sleeve, and a hook. The traction rope is fixedly connected to the front end of the cross-shaped insert rod and moves through the push plate. The hanging sleeve is fixedly connected to the front end of the traction rope, and the hook is fixedly connected to the front end of the push plate, and the hook matches the hanging sleeve.

[0014] As a preferred embodiment of the present invention, a level is fixedly connected to the right end of the push plate, and the level is slidably engaged with the main scale plate.

[0015] As a preferred embodiment of the present invention, the front end of the main ruler plate is fixedly connected to two handles, and the two handles are symmetrically arranged.

[0016] 3. Beneficial Effects Compared with the prior art, the advantages of this invention are: (1) When drawing, the drawing can be done using the main ruler plate. When the main ruler plate is not long enough, hold the connecting plate and pull it to the right. The movement of the connecting plate to the right drives the rack to move to the right. The movement of the rack drives the gear to rotate forward. The forward rotation of the gear drives the first rotating rod to rotate forward. The forward rotation of the first rotating rod drives the ratchet to rotate forward. The meshing of the pawl and the ratchet ensures that when the ratchet rotates forward, the ratchet and the pawl will not block each other. Thus, when the ratchet rotates forward, the pawl will not block the ratchet's rotation. The ratchet and the pawl work together to make the ratchet rotate in one direction. When the ratchet rotates in the opposite direction, the pawl engages with the ratchet through the elasticity of the first spring, so that the ratchet cannot rotate in the opposite direction. It is necessary to first rotate the second rotating rod and the pawl through the rotating plate so that the pawl does not mesh with the ratchet before the ratchet can be rotated in the opposite direction. The extension of the main ruler's drawing length improves drawing convenience. When drawing a diagonal line, first pull the sleeve outward, then hang the sleeve on the hook surface. The outward movement of the sleeve drives the traction rope to move outward, which in turn pulls the crossbar to move outward. As the crossbar moves outward, it compresses the second spring. When the sleeve is hung on the hook, the second spring is compressed, and the crossbar moves outward until it is disengaged from the cross groove. Once the crossbar is no longer engaged with the cross groove, the third rotating rod can rotate freely. Then, hold the secondary ruler and rotate it. The rotation of the secondary ruler facilitates drawing diagonal lines without moving the main ruler, improving drawing convenience. Furthermore, the movement of the slider can move the secondary ruler, further enhancing drawing convenience.

[0017] (2) In this scheme, the traction rope is for easy pulling of the cross rod, the hanging sleeve is for easy pulling of the traction rope, the movement of the hanging sleeve drives the traction rope to move, thereby pulling the cross rod to move, and the movement of the cross rod compresses the second spring. The hook is for easy engagement with the hanging sleeve. By engaging the hanging sleeve with the hook, it is easy to limit the hanging sleeve. By limiting the hanging sleeve, the traction rope pulls the cross rod to move, thereby causing the cross rod to disengage from the cross groove, preventing the cross rod from resetting due to the elasticity of the second spring.

[0018] (3) In this scheme, a level is fixedly connected to the right end of the push plate. The level slides with the main ruler plate. The level makes it easy to check whether the main ruler plate is level, thus improving the ease of drawing. Two handles are fixedly connected to the front end of the main ruler plate. The handles make it easy to lift the main ruler plate and hang it up, thus improving the ease of placing the main ruler plate. Attached Figure Description

[0019] Figure 1 This is a front perspective view of the present invention; Figure 2 This is an exploded view of the entire invention; Figure 3This is a rear perspective view of the present invention; Figure 4 This is a rear view of the main ruler plate of the present invention; Figure 5 This is a cross-sectional view of the main ruler plate of the present invention; Figure 6 This is an exploded view of the self-locking mechanism of the present invention; Figure 7 This is an exploded view of the positioning mechanism of the present invention; Figure 8 This is a cross-sectional view of the positioning mechanism of the present invention.

[0020] Explanation of the labels in the diagram: 1. Main scale plate; 2. First mounting slot; 3. First sliding hole; 4. First insertion hole; 5. Second insertion hole; 6. First scale bar; 7. Second mounting slot; 8. Handle; 9. Second sliding hole; 10. Limiting slot; 11. Rack; 12. Insert bar; 13. Connecting plate; 14. First rotating rod; 15. Gear; 16. Ratchet; 17. Second rotating rod; 18. Pawl; 19. Rotating plate; 20. First spring; 21. Fixing plate; 22. Secondary scale plate; 23. Second scale bar; 24. Third rotating rod; 25. Cross groove; 26. Slider; 27. Limiting plate; 28. Third mounting slot; 29. ​​Cross insertion rod; 30. Second spring; 31. Traction rope; 32. Hanging sleeve; 33. Push plate; 34. Hook; 35. Level. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] Example: Please see Figure 1-8 A hand-drawn mechanical drawing and industrial design ruler, comprising: Main ruler plate 1; The first mounting slot 2 is opened inside the main scale plate 1; The second insertion hole 5 is located at the right end of the main ruler plate 1, and the second insertion hole 5 is connected to the first mounting groove 2. The first scale bar 6 is installed at the front end of the main scale plate 1; The second mounting slot 7 is located at the rear end of the main scale plate 1; Insert 12 is slidably connected to the second socket 5; Connecting plate 13 is fixedly connected to the right end of insert 12; A secondary ruler plate 22 is movably inserted into a second mounting slot 7, and two second scale bars 23 are installed at the front end of the second mounting slot 7. The third rotating rod 24 is fixedly connected to the front end of the auxiliary ruler plate 22.

[0023] In this embodiment, the first mounting groove 2 is provided to accommodate the self-locking mechanism, the second insertion hole 5 is provided to facilitate sliding engagement with the insertion strip 12, the insertion strip 12 is provided to facilitate fixing the connecting plate 13, and when it is necessary to draw a longer line, the engagement of the connecting plate 13 and the insertion strip 12 facilitates the extension of the line drawing, the secondary ruler plate 22 is provided to facilitate rotation, and the rotation of the secondary ruler plate 22 facilitates the drawing of diagonal lines without moving the main ruler plate 1, the third rotating rod 24 is provided to facilitate the opening of the cross groove 25, the present invention uses the interaction of the ratchet 16 and the pawl 18 to make the ratchet 16 rotate in one direction to prevent the connecting plate 13 from moving to the left, thereby making it more convenient to draw longer lines, and at the same time the rotation of the secondary ruler plate 22 facilitates the drawing of diagonal lines, the movement of the slider 26 can drive the secondary ruler plate 22 to move, further optimizing the convenience of drawing, thereby meeting the diversity of drawing and drafting.

[0024] Specifically, the self-locking mechanism is located inside the main scale plate 1 and is connected to the connecting plate 13. The self-locking mechanism includes a transmission component and a self-locking component, both of which are located inside the main scale plate 1 and are connected to each other.

[0025] In this embodiment, the self-locking mechanism includes a transmission component and a self-locking component, both of which are disposed within the main scale plate 1 and are connected to each other.

[0026] Specifically, the transmission assembly includes a first insertion hole 4, a rack 11, a first rotating rod 14, and a gear 15. The first insertion hole 4 is located at the right end of the main scale plate 1. The rack 11 is fixedly connected to the left end of the connecting plate 13 and is movably inserted into the first insertion hole 4. The first rotating rod 14 is rotatably connected between the front and rear inner walls of the main scale plate 1. The gear 15 is fixedly connected to the surface of the first rotating rod 14 and meshes with the rack 11.

[0027] In this embodiment, the first insertion hole 4 is provided to facilitate the passage of the rack 11, the rack 11 is provided to facilitate meshing with the gear 15, and the first rotating rod 14 is provided to facilitate fixing the gear 15. The meshing of the gear 15 and the rack 11 allows the rack 11 to move and drive the gear 15 to rotate, thereby driving the first rotating rod 14 to rotate through the rotation of the gear 15. The rotation of the first rotating rod 14 facilitates the rotation of the ratchet 16.

[0028] Specifically, the self-locking assembly includes a ratchet 16, a second rotating rod 17, a pawl 18, a rotating plate 19, a first spring 20, and a fixing plate 21. The ratchet 16 is fixedly connected to the surface of the first rotating rod 14. The second rotating rod 17 is rotatably connected to the main scale plate 1, and the front end of the second rotating rod 17 moves through the main scale plate 1. The pawl 18 is fixedly connected to the surface of the second rotating rod 17, and the pawl 18 meshes with the ratchet 16. The rotating plate 19 is fixedly connected to the front end of the second rotating rod 17. The first spring 20 is fixedly connected to the lower end of the rotating plate 19. The fixing plate 21 is fixedly connected to the front end of the main scale plate 1, and the upper end of the fixing plate 21 is fixedly connected to the rotating plate 19.

[0029] In this embodiment, the ratchet 16 is for easy engagement with the pawl 18, the second rotating rod 17 is for easy fixing of the pawl 18 and the rotating plate 19, and the engagement of the pawl 18 and the ratchet 16 prevents the ratchet 16 from reversing. The rotating plate 19 is for easy rotation of the second rotating rod 17, and the rotation of the second rotating rod 17 drives the pawl 18 to move, thereby preventing the pawl 18 from engaging with the ratchet 16. The fixing plate 21 is for easy fixing of the first spring 20, and the elastic action of the first spring 20 positions the rotating plate 19, thereby ensuring that the pawl 18 is always engaged with the ratchet 16. The engagement of the pawl 18 and the ratchet 16 prevents the ratchet 18 from reversing. When the ratchet 16 rotates forward, the ratchet 16 and the pawl 18 will not block each other, so the pawl 18 will not obstruct the rotation of the ratchet 16. The ratchet 16 rotates in one direction through the cooperation of the ratchet 16 and the pawl 18. When the ratchet 16 rotates in reverse, the pawl 18 engages with the ratchet 16 through the elastic action of the first spring 20, so the ratchet 16 cannot rotate in the opposite direction. It is necessary to first rotate the second rotating rod 17 and the pawl 18 through the rotating plate 19 so that the pawl 18 is not engaged with the ratchet 16 before the ratchet 16 can be rotated in reverse. The movement of the rack 11 and the connecting plate 13 extends the drawing length of the main ruler plate 1 and optimizes the convenience of drawing.

[0030] Specifically, the positioning mechanism is located inside the main scale plate 1 and is connected to the third rotating rod 24. The positioning mechanism includes a sliding component, a positioning component, and a limiting component. The sliding component, the positioning component, and the limiting component are all located inside the main scale plate 1. The sliding component is connected to the positioning component, and the positioning component is connected to the limiting component.

[0031] In this embodiment, the positioning mechanism includes a sliding component, a positioning component, and a limiting component. The sliding component, the positioning component, and the limiting component are all disposed within the main ruler plate 1. The sliding component is connected to the positioning component, and the positioning component is connected to the limiting component.

[0032] Specifically, the sliding assembly includes a first sliding hole 3, a second sliding hole 9, a limiting groove 10, a slider 26, a limiting plate 27, and a push plate 33. The first sliding hole 3 is opened at the front end of the main scale plate 1, and the second sliding hole 9 is opened in the second mounting groove 7. There are two limiting grooves 10 and two limiting plates 27. The two limiting grooves 10 are respectively opened on the upper and lower inner walls of the second sliding hole 9. The slider 26 is slidably connected in the first sliding hole 3 and the second sliding hole 9. The two limiting plates 27 are respectively fixedly connected to the upper and lower ends of the slider 26, and the two limiting plates 27 are respectively slidably connected in the two limiting grooves 10. The push plate 33 is fixedly connected to the front end of the slider 26.

[0033] In this embodiment, the first sliding hole 3 and the second sliding hole 9 are provided to facilitate the sliding of the slider 26, the limiting groove 10 is provided to facilitate the sliding of the limiting plate 27, and the slider 26 is limited by the sliding cooperation of the limiting groove 10 and the limiting plate 27. The slider 26 is provided to facilitate the opening of the third mounting groove 28, and the push plate 33 is provided to facilitate the movement of the slider 26.

[0034] Specifically, the positioning component includes a cross groove 25, a third mounting groove 28, a cross insert rod 29, and a second spring 30. The cross groove 25 is located at the front end of the third rotating rod 24, the third mounting groove 28 is located within the slider 26, the third rotating rod 24 is rotatably connected to the third mounting groove 28, the cross insert rod 29 is slidably connected to the third mounting groove 28, and the cross insert rod 29 is movably inserted into the cross groove 25. The second spring 30 is fixedly connected between the cross insert rod 29 and the third mounting groove 28.

[0035] In this embodiment, the cross groove 25 is provided to facilitate engagement with the cross insert rod 29. The engagement between the cross groove 25 and the cross insert rod 29 limits the third rotating rod 24, preventing it from rotating. When the cross insert rod 29 is no longer engaged with the cross groove 25, the third rotating rod 24 can be rotated. The third mounting groove 28 facilitates the rotatable connection of the third rotating rod 24 and also serves to accommodate the cross insert rod 29 and the second spring 30. The second spring 30 is used to fix the cross insert rod 29 in the cross groove 25 through its elasticity, thereby positioning the third rotating rod 24 through the engagement between the spring 39 and the cross groove 25.

[0036] Specifically, the limiting component includes a traction rope 31, a hanging sleeve 32, and a hook 34. The traction rope 31 is fixedly connected to the front end of the cross-shaped insert 29 and the traction rope 31 moves through the push plate 33. The hanging sleeve 32 is fixedly connected to the front end of the traction rope 31, and the hook 34 is fixedly connected to the front end of the push plate 33 and matches the hanging sleeve 32.

[0037] In this embodiment, the traction rope 31 is for facilitating the movement of the cross-shaped insert 29, and the hanging sleeve 32 is for facilitating the movement of the traction rope 31. The movement of the hanging sleeve 32 drives the traction rope 31 to move, thereby pulling the cross-shaped insert 29 to move. The movement of the cross-shaped insert 29 also compresses the second spring 30. The hook 34 is for facilitating engagement with the hanging sleeve 32. By engaging the hanging sleeve 32 with the hook 34, the hanging sleeve 32 is limited. The limitation of the hanging sleeve 32 causes the traction rope 31 to pull the cross-shaped insert 29 to move, thereby causing the cross-shaped insert 29 to disengage from the cross groove 25 and preventing the cross-shaped insert 29 from resetting due to the elastic action of the second spring 30.

[0038] Specifically, a level 35 is fixedly connected to the right end of the push plate 33, and the level 35 slides with the main scale plate 1.

[0039] In this embodiment, a level 35 is fixedly connected to the right end of the push plate 33. The level 35 slides with the main ruler plate 1. The level 35 makes it easy to check whether the main ruler plate 1 is level, thus improving the ease of drawing.

[0040] Specifically, the front end of the main ruler plate 1 is fixedly connected to two handles 8, and the two handles 8 are symmetrically arranged.

[0041] In this embodiment, two handles 8 are fixedly connected to the front end of the main ruler plate 1, and the two handles 8 are symmetrically arranged. The handles 8 make it easy to lift the main ruler plate 1 and also make it easy to hang the main ruler plate 1 for placement, thus optimizing the convenience of placing the main ruler plate 1.

[0042] Working principle: When drawing, the drawing can be made using the main ruler plate 1. When the main ruler plate 1 is not long enough, hold the connecting plate 13 and pull it to the right. The movement of the connecting plate 13 to the right drives the rack 11 to move to the right. The movement of the rack 11 drives the gear 15 to rotate clockwise. The clockwise rotation of the gear 15 drives the first rotating rod 14 to rotate clockwise. The clockwise rotation of the first rotating rod 14 drives the ratchet 16 to rotate clockwise. Through the meshing of the pawl 18 and the ratchet 16, when the ratchet 16 rotates clockwise, the ratchet 16 and the ratchet... The pawl 18 will not block the ratchet 16, so when the ratchet 16 rotates forward, the pawl 18 will not obstruct the rotation of the ratchet 16. The ratchet 16 rotates in one direction only through the interaction of the ratchet 16 and the pawl 18. When the ratchet 16 rotates in the reverse direction, the pawl 18 engages with the ratchet 16 through the elastic action of the first spring 20, thus preventing the ratchet 16 from rotating in the opposite direction. It is necessary to first rotate the second lever 17 and the pawl 18 through the rotating plate 19 so that the pawl 18 is not engaged with the ratchet 16 before the ratchet 16 can be rotated in the reverse direction. The movement of strip 11 and connecting plate 13 extends the drawing length of the main ruler plate 1, optimizing the convenience of drawing. When it is necessary to draw a diagonal line, first pull the hanging sleeve 32 outward, and then hang the hanging sleeve 32 on the surface of the hook 34. The outward movement of the hanging sleeve 32 drives the traction rope 31 to move outward. The movement of the traction rope 31 pulls the cross rod 29 to move outward. When the cross rod 29 moves outward, it will compress the second spring 30. When the hanging sleeve 32 is hung on the hook 34, the second spring 30 is in a compressed state. At the same time, the cross rod 29 moves outward until it is disengaged from the cross groove 25. When the cross rod 29 is no longer engaged with the cross groove 25, the third rotating rod 24 can rotate freely. Then, hold the auxiliary ruler plate 22 and rotate the auxiliary ruler plate 22. The rotation of the auxiliary ruler plate 22 makes it easy to draw a diagonal line without moving the main ruler plate 1, optimizing the convenience of drawing. Furthermore, the movement of the slider 26 can drive the auxiliary ruler plate 22 to move, further optimizing the convenience of drawing.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A hand-drawn mechanical drafting industrial design ruler, characterized in that, include: Main ruler plate (1); The first mounting slot (2) is opened inside the main ruler plate (1); The second insertion hole (5) is located at the right end of the main ruler plate (1) and is connected to the first mounting groove (2). The first scale bar (6) is installed at the front end of the main scale plate (1); The second mounting slot (7) is located at the rear end of the main ruler plate (1); Insert (12), which is slidably connected to the second socket (5); A connecting plate (13) is fixedly connected to the right end of the insert (12); A secondary ruler plate (22) is movably inserted into a second mounting groove (7), and two second scale strips (23) are installed at the front end of the second mounting groove (7). The third rotating rod (24) is fixedly connected to the front end of the auxiliary ruler plate (22); The self-locking mechanism is located inside the main plate (1) and is connected to the connecting plate (13); The positioning mechanism is located inside the main ruler plate (1) and is connected to the third rotating rod (24); The self-locking mechanism includes a transmission component and a self-locking component. The transmission component includes a first insertion hole (4), a rack (11), a first rotating rod (14), and a gear (15). The first insertion hole (4) is located at the right end of the main scale plate (1). The rack (11) is fixedly connected to the left end of the connecting plate (13), and the rack (11) is movably inserted into the first insertion hole (4). The first rotating rod (14) is rotatably connected between the front and rear inner walls of the main scale plate (1). The gear (15) is fixedly connected to the surface of the first rotating rod (14), and the gear (15) meshes with the rack (11). The self-locking assembly includes a ratchet (16), a second rotating rod (17), a pawl (18), a rotating plate (19), a first spring (20), and a fixed plate (21). The ratchet (16) is fixedly connected to the surface of the first rotating rod (14). The second rotating rod (17) is rotatably connected to the main scale plate (1), and the front end of the second rotating rod (17) moves through the main scale plate (1). The pawl (18) is fixedly connected to the surface of the second rotating rod (17), and the pawl (18) meshes with the ratchet (16). The rotating plate (19) is fixedly connected to the front end of the second rotating rod (17). The first spring (20) is fixedly connected to the lower end of the rotating plate (19). The fixed plate (21) is fixedly connected to the front end of the main scale plate (1), and the upper end of the fixed plate (21) is fixedly connected to the rotating plate (19).

2. The hand-drawn mechanical drafting industrial design ruler according to claim 1, characterized in that: Both the transmission component and the self-locking component are located inside the main scale plate (1), and the transmission component and the self-locking component are connected.

3. The hand-drawn mechanical drafting industrial design ruler according to claim 1, characterized in that: The positioning mechanism includes a sliding component, a positioning component, and a limiting component. The sliding component, the positioning component, and the limiting component are all disposed inside the main ruler plate (1). The sliding component is connected to the positioning component, and the positioning component is connected to the limiting component.

4. A hand-drawn mechanical drafting industrial design ruler according to claim 3, characterized in that: The sliding assembly includes a first sliding hole (3), a second sliding hole (9), a limiting groove (10), a slider (26), a limiting plate (27), and a push plate (33). The first sliding hole (3) is opened at the front end of the main scale plate (1), and the second sliding hole (9) is opened in the second mounting groove (7). The limiting groove (10) and the limiting plate (27) are both set to two. The two limiting grooves (10) are respectively opened on the upper and lower inner walls of the second sliding hole (9). The slider (26) is slidably connected in the first sliding hole (3) and the second sliding hole (9). The two limiting plates (27) are respectively fixedly connected to the upper and lower ends of the slider (26), and the two limiting plates (27) are respectively slidably connected in the two limiting grooves (10). The push plate (33) is fixedly connected to the front end of the slider (26).

5. A hand-drawn mechanical drafting industrial design ruler according to claim 4, characterized in that: The positioning component includes a cross groove (25), a third mounting groove (28), a cross rod (29), and a second spring (30). The cross groove (25) is located at the front end of the third rotating rod (24). The third mounting groove (28) is located within the slider (26). The third rotating rod (24) is rotatably connected to the third mounting groove (28). The cross rod (29) is slidably connected to the third mounting groove (28) and is movably inserted into the cross groove (25). The second spring (30) is fixedly connected between the cross rod (29) and the third mounting groove (28).

6. A hand-drawn mechanical drafting industrial design ruler according to claim 5, characterized in that: The limiting component includes a traction rope (31), a hanging sleeve (32), and a hook (34). The traction rope (31) is fixedly connected to the front end of the cross rod (29), and the traction rope (31) moves through the push plate (33). The hanging sleeve (32) is fixedly connected to the front end of the traction rope (31), and the hook (34) is fixedly connected to the front end of the push plate (33), and the hook (34) matches the hanging sleeve (32).

7. A hand-drawn mechanical drafting industrial design ruler according to claim 6, characterized in that: A level (35) is fixedly connected to the right end of the push plate (33), and the level (35) slides in conjunction with the main ruler plate (1).

8. A hand-drawn mechanical drafting industrial design ruler according to claim 7, characterized in that: The front end of the main ruler plate (1) is fixedly connected to two handles (8), and the two handles (8) are symmetrically arranged.

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