An engineering marker pen

Abstract

The application discloses an engineering marker pen and belongs to the technical field of marker pens. The engineering marker pen comprises a shell, a fixing seat is fixedly connected to the inner wall of the shell, a pen barrel vertically and slidably arranged in the fixing seat, and a first thread is arranged on the bottom end inner wall of the shell. The engineering marker pen is characterized in that: the connecting plate is rotated counterclockwise and clockwise, the fourth thread is rotated clockwise or counterclockwise in the third thread, the gap between the connecting plate and the cap gradually increases or decreases, the pushing plate is subjected to the extrusion force of the bottom surface of the cap, the extrusion force of the pushing plate increases or decreases, the shrinkage or extension of the protection plate is controlled, the protection plate is retracted into the slot when the marker pen is used, the protection plate is extended from the slot after the use of the marker pen, the protection plate and the shell form a sealed cavity, the pen end of the pen barrel is prevented from being exposed to the air and dried, the marker pen can be continuously used, the waste of the marker pen is avoided, and the use cost of the marker pen is reduced.

Description

Technical Field

[0001] This invention relates to the field of marker technology, and more specifically, to an engineering marker. Background Technology

[0002] A marker is a pen that can write marks or symbols on one or more materials such as paper, wood, metal, plastic, and enamel. Markers are divided into oil-based markers and water-based markers. Water-based markers can write on smooth surfaces or whiteboards and can be wiped off with a cloth (whiteboard markers). Oil-based markers are not easy to erase. Markers are also used in engineering projects, usually for marking, drawing, and writing on paper.

[0003] When using existing markers, it is easy to lose the marker cap. This means that after use, the part of the marker that is in contact with the paper dries out because there is no cap to protect it, and it can no longer be used. In this case, a new marker needs to be replaced, which not only wastes the marker but also increases the cost of using the marker. Summary of the Invention

[0004] The purpose of this invention is to provide an engineering marker to solve the problems mentioned in the background section above:

[0005] When using existing markers, it is easy to lose the marker cap. This means that after use, the part of the marker that is in contact with the paper dries out because there is no cap to protect it, and it can no longer be used. In this case, a new marker needs to be replaced, which not only wastes the marker but also increases the cost of using the marker.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An engineering marker pen includes a housing, a fixing base fixedly connected to the inner wall of the housing, a pen barrel that can slide vertically up and down inside the fixing base, a first thread on the bottom inner wall of the housing, a pen cap at the bottom of the housing, a second thread matching the first thread on the top of the pen cap, a connecting plate below the pen cap, a third thread on the bottom inner wall of the pen cap, a fourth thread matching the third thread on the top of the connecting plate, a slot inside the connecting plate, a protective plate movably connected inside the slot, a push plate fixedly connected to the end surface of the protective plate, a first spring elastically connected between the protective plate and the inner wall of the slot, and a groove on the top surface of the connecting plate surrounding the fourth thread, through which the push plate extends to the top of the connecting plate.

[0008] By adopting the above technical solution, when the marker is in use, the protective plate retracts into the slot. After the marker is finished, the protective plate extends out from the slot, and the protective plate and the outer shell form a sealed cavity, which prevents the pen barrel and pen tip from contacting the outside world and prevents the pen barrel and pen tip from drying out. This allows the marker to be used continuously, which not only avoids waste of markers but also reduces the cost of using markers.

[0009] Preferably, the surface of the outer shell is provided with a groove, and a connecting rod is movably connected inside the groove. One end of the connecting rod is fixedly connected to the surface of the pen barrel, and the other end of the connecting rod is fixedly connected to a movable seat. A second spring is elastically connected between the connecting rod and the fixed seat.

[0010] By adopting the above technical solution, manually pushing the movable seat downwards causes the connecting rod and pen barrel to move downwards, so that the pen barrel protrudes when the marker is in use.

[0011] Preferably, the bottom surface of the connecting rod is provided with a movable groove, the interior of the movable groove is provided with a spring shaft, the surface of the spring shaft is provided with a locking rod, the locking rod is rotatably connected to the movable groove through the spring shaft, a fixing block is fixedly connected below the groove on the inner wall of the outer shell, the surface of the fixing block is provided with a ramp rail, the lower part of the ramp rail on the surface of the fixing block is provided with a locking groove that engages with the locking rod, the surface of the outer shell is provided with a sliding groove that communicates with the locking groove, a top post is slidably connected inside the sliding groove of the rotating shaft, one end of the top post extends into the locking groove, and the other end of the top post is fixedly connected with a button.

[0012] By adopting the above technical solution, the bottom of the lever engages and locks with the slot. At this time, the bottom of the pen protrudes from the outer casing. When the marker is finished, pressing the button moves the top post into the slot, compressing the third spring. At this time, the movement of the top post will squeeze the bottom surface of the lever, causing the lever to rotate on the spring shaft surface. The lever disengages from the slot, and the pen returns to its original position under the action of the second spring and is stored in the outer casing.

[0013] Preferably, one end of the first spring is fixedly connected to the protective plate, and the other end of the first spring is fixedly connected to the inner wall of the slot.

[0014] By adopting the above technical solution, the protection plate is reset under the action of the first spring.

[0015] Preferably, a third spring is fitted onto the surface of the top post, and the two ends of the third spring are fixedly connected to the inner wall of the slide groove and the button, respectively.

[0016] By adopting the above technical solution, the button is reset under the action of the third spring.

[0017] Preferably, a second spring is sleeved on the surface of the pen barrel, one end of the second spring is fixedly connected to the fixed base, and the other end of the second spring is fixedly connected to the connecting rod.

[0018] By adopting the above technical solution, the pen barrel is reset and moved into the outer shell under the action of the second spring.

[0019] Preferably, the top of the outer shell is provided with a pen cap, the top surface of the outer shell is provided with a fifth thread, the top surface of the outer shell is provided with a small diameter hole and a large diameter hole respectively, the inner wall of the pen cap is provided with threads that match the fifth thread, and the top surface of the pen cap is provided with an opening.

[0020] By adopting the above technical solution, when the upper opening is aligned with the smaller diameter hole, less air enters the smaller diameter hole, creating a partial vacuum in the ink inside the pen. At this time, the ink flow rate will be slightly slower, and the characters we write will be smaller. When the upper opening is aligned with the larger diameter hole, more air flows into the larger diameter hole, and the ink flow rate will be slightly faster, and the characters we write will be thicker. This allows us to change the thickness of the lines on the pen.

[0021] Preferably, an ink reservoir is fixedly connected to the upper part of the pen barrel on the inner wall of the outer shell, an ink outlet tube is provided at the bottom of the ink reservoir, the ink outlet tube is connected to the ink reservoir, an ink filling hole is provided on the outer surface of the outer shell, the ink filling hole is connected to the ink reservoir, and a plug is provided on the outside of the ink filling hole.

[0022] By adopting the above technical solution, the plug on the outside of the ink filling hole is removed, and the ink filling hole is connected to the ink storage tank. The ink storage tank contains ink, and at this time, outside air enters the ink storage tank. The ink in the ink storage tank drips into the ink-absorbing cotton at the top of the pen barrel through the ink outlet tube under its own weight, making the engineering marker pen reusable and more environmentally friendly and economical in use.

[0023] Preferably, the pen barrel is provided with an ink-absorbing sponge inside, and the ink outlet tube is inserted into the ink-absorbing sponge at the top of the pen barrel.

[0024] By adopting the above technical solution, the ink-absorbing cotton has good absorbency.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1) When the marker pen in this project is in use, the fourth thread rotates clockwise or counterclockwise within the third thread by rotating the connecting plate counterclockwise or clockwise. This gradually increases or decreases the gap between the connecting plate and the pen cap. The push plate is subjected to increasing or decreasing pressure from the bottom surface of the pen cap, which controls the contraction or extension of the protective plate. When the marker pen is in use, the protective plate retracts into the slot. After the marker pen is used, the protective plate extends out of the slot. The protective plate and the outer shell form a sealed cavity, preventing the pen barrel and pen tip from contacting the outside world and preventing the pen barrel and pen tip from drying out. This allows the marker pen to be used continuously, which not only avoids waste of marker pens but also reduces the cost of using marker pens.

[0027] 2) When using this marker, rotating the top cap aligns the opening with the different holes on the top surface of the outer shell. When the opening is aligned with the small diameter hole, less air enters the small diameter hole from the upper opening, creating a partial vacuum in the ink inside the pen. At this time, the ink flow rate will be slightly slower, and the characters we write will be smaller. When the opening is aligned with the large diameter hole, more air enters the large diameter hole from the upper opening, and the ink flow rate will be slightly faster, and the characters we write will be larger. This allows the marker to change the thickness of the lines, making the marker multifunctional.

[0028] 3) When using this engineering marker, the plug on the outside of the ink filling hole is removed, connecting the ink filling hole to the ink tank. The ink tank contains ink, and at this time, outside air enters the ink tank. The ink in the ink tank drips through the ink outlet tube into the ink-absorbing cotton at the top of the pen barrel under its own weight, making the engineering marker reusable and more environmentally friendly and economical in use. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the pen barrel structure of the present invention;

[0031] Figure 3 This is a schematic diagram of the internal structure of the outer shell of the present invention;

[0032] Figure 4 For the present invention Figure 3 A magnified view of part A in the image;

[0033] Figure 5 This is a schematic diagram of the pen cap structure of the present invention;

[0034] Figure 6 This is a schematic diagram of the third thread structure of the present invention;

[0035] Figure 7 This is a schematic diagram of the protective plate structure of the present invention;

[0036] Figure 8 This is a schematic diagram of the internal structure of the protective plate of the present invention;

[0037] Figure 9 This is a schematic diagram of the movable seat structure of the present invention.

[0038] The following are the labeling symbols in the diagram: 1. Outer shell; 2. Fixing base; 3. Pen barrel; 4. First thread; 5. Pen cap; 6. Second thread; 7. Connecting plate; 8. Third thread; 9. Fourth thread; 10. Slot; 11. Protective plate; 12. Push plate; 13. First spring; 14. Groove; 15. Connecting rod; 16. Movable seat; 17. Movable groove; 18. Spring shaft; 19. Locking rod; 20. Fixing block; 21. Inclined track; 22. Locking groove; 23. Second spring; 24. Button; 25. Fifth thread; 26. Small diameter hole; 27. Large diameter hole; 28. Pen cap; 29. ​​Opening; 30. Ink reservoir; 31. Ink outlet tube; 32. Ink filling hole; 33. Slide groove; 34. Top column; 35. Third spring. Detailed Implementation

[0039] Example 1

[0040] When using existing markers, it is easy to lose the marker cap. This causes the part of the marker that is in contact with the paper to dry out after use, making it unusable and requiring replacement with a new marker. This not only wastes markers but also increases the cost of using them. The following solution can solve this problem.

[0041] Please see Figures 1 to 9 An engineering marker pen includes a housing 1, a fixing base 2 fixedly connected to the inner wall of the housing 1, and a pen barrel 3 that can slide vertically up and down inside the fixing base 2. The pen barrel 3 is a commonly used pen barrel with an ink-absorbing sponge. A first thread 4 is provided on the inner wall of the bottom end of the housing 1. A pen cap 5 is provided below the housing 1. A second thread 6 matching the first thread 4 is provided above the pen cap 5. A connecting plate 7 is provided below the pen cap 5. A third thread 8 is provided on the inner wall of the bottom end of the pen cap 5. A fourth thread 9 matching the third thread 8 is provided above the connecting plate 7. A slot 10 is provided inside the connecting plate 7. A retaining device is movably connected inside the slot 10. The protective plate 11 has a push plate 12 fixedly connected to its end surface. A first spring 13 is elastically connected between the protective plate 11 and the inner wall of the slot 10. The top surface of the fourth thread 9 peripheral connecting plate 7 has a slot. The push plate 12 extends through the slot to the top of the connecting plate 7. When the marker is in use, the protective plate 11 retracts into the slot 10. After the marker is used, the protective plate 11 extends out of the slot 10. The protective plate 11 and the outer shell 1 form a sealed cavity, which prevents the end of the pen 3 from contacting the outside and prevents the end of the pen 3 from drying out. This allows the marker to be used continuously, which not only avoids waste of markers but also reduces the cost of using markers.

[0042] The outer casing 1 has a slot 14 on its surface. A connecting rod 15 is movably connected inside the slot 14. One end of the connecting rod 15 is fixedly connected to the surface of the pen barrel 3, and the other end of the connecting rod 15 is fixedly connected to a movable seat 16. A second spring 23 is elastically connected between the connecting rod 15 and the fixed seat 2. When the movable seat 16 is manually pushed down, the connecting rod 15 and the pen barrel 3 move downward, so that the pen barrel 3 is exposed when the marker is in use.

[0043] A movable groove 17 is formed on the bottom surface of the connecting rod 15. A spring shaft 18 is provided inside the movable groove 17. A locking rod 19 is provided on the surface of the spring shaft 18. The spring shaft 18 is a conventional spring return shaft in the prior art. The locking rod 19 is rotatably connected to the movable groove 17 through the spring shaft 18. A fixing block 20 is fixedly connected to the lower part of the groove 14 on the inner wall of the outer shell 1. A ramp rail 21 is provided on the surface of the fixing block 20. The ramp rail 21 can change the movement trajectory of the locking rod 19. A locking groove 22 is formed below the ramp rail 21 on the surface of the fixing block 20 to engage with the locking rod 19. The locking rod 19 engages with the locking groove 22, so that the pen barrel 3 protrudes from the outer shell 1 and is locked. The surface has a sliding groove 33 that communicates with the slot 22. A top post 34 is slidably connected inside the sliding groove 33. One end of the top post 34 extends into the slot 22, and the other end of the top post 34 is fixedly connected to a button 24. The bottom of the lever 19 engages with and locks into the slot 22. At this time, the bottom of the pen 3 protrudes from the outer shell 1. When the marker is finished, pressing the button 24 moves the top post 34 into the slot 22 to compress the third spring 35. At this time, the movement of the top post 34 will squeeze the bottom surface of the lever 19, causing the lever 19 to rotate on the surface of the spring shaft 18. The lever 19 disengages from the slot 22, and the pen 3 is reset under the action of the second spring 23 and stored in the outer shell 1.

[0044] One end of the first spring 13 is fixedly connected to the protective plate 11, and the other end of the first spring 13 is fixedly connected to the inner wall of the slot 10. Under the action of the first spring 13, the protective plate 11 is reset.

[0045] A third spring 35 is fitted onto the surface of the top post 34. The two ends of the third spring 35 are fixedly connected to the inner wall of the slide groove 33 and the button 24, respectively. Under the action of the third spring 35, the button 24 is reset.

[0046] A second spring 23 is fitted onto the surface of the pen barrel 3. One end of the second spring 23 is fixedly connected to the fixed base 2, and the other end of the second spring 23 is fixedly connected to the connecting rod 15. Under the action of the second spring 23, the pen barrel 3 is reset and moved into the outer shell 1.

[0047] The usage steps of this invention are as follows: Before using the marker, the pen cap 5 and the connecting plate 7 are tightly fitted together. Under the pressure of the bottom surface of the pen cap 5, the push plate 12 extends and fits together to form a closed space. At this time, the first spring 13 is compressed. When using the marker, first manually rotate the connecting plate 7 counterclockwise. The fourth thread 9 rotates counterclockwise within the third thread 8. At this time, the connecting plate 7 rotates downwards counterclockwise, and the gap between the connecting plate 7 and the pen cap 5 gradually widens. During the reset process of the first spring 13, the protective plates 11 and the push plate 12 reset under the action of the first spring 13, and the protective plates 11 retract into the slot 10. At this point, the bottom of the marker is opened. Manually pushing the movable seat 16 downwards moves the connecting rod 15 and the pen barrel 3 downwards, compressing the second spring 23. During the downward movement of the connecting rod 15, when the locking rod 19 contacts the ramp rail 21, the locking rod 19 is compressed by the ramp rail 21 and rotates on the surface of the spring shaft 18. When the bottom of the locking rod 19 is aligned with the slot 22, the locking rod 19 returns to its original position under the action of the spring shaft 18. At this point, the bottom of the locking rod 19 engages with and locks the slot 22. At this point, the bottom of the pen barrel 3 protrudes from the outer casing 1. After the marker is used, pressing the button 24 moves the top post 34 into the slot 22, compressing the third spring 35. When the top post 34 moves, it presses against the bottom surface of the locking rod 19, causing the locking rod 19 to rotate on the surface of the spring shaft 18. The locking rod 19 disengages from the locking groove 22, and the pen barrel 3 resets under the action of the second spring 23 and is stored inside the outer casing 1. Then, the connecting plate 7 is rotated clockwise. When the fourth thread 9 rotates clockwise within the third thread 8, the connecting plate 7 rotates clockwise and moves upward. At this time, the push plate 12 is pressed into the slot 10 by the bottom surface of the pen cap 5. The movement of the push plate 12 drives the protective plate 11 to move. The protective plate 11 moves into the slot 10. Under the action of multiple protective plates 11, the bottom of the outer casing 1 is closed, and the marker pen is in a sealed state. This solution is achieved through the connecting plate 7. The fourth thread 9 rotates clockwise or counterclockwise within the third thread 8, causing the gap between the connecting plate 7 and the pen cap 5 to gradually increase or decrease. The push plate 12 experiences increasing or decreasing pressure from the bottom surface of the pen cap 5, controlling the retraction or extension of the protective plate 11. When the marker is in use, the protective plate 11 retracts into the slot 10. After the marker is used, the protective plate 11 extends out of the slot 10. The protective plate 11 and the outer shell 1 form a sealed cavity, preventing the pen tip of the pen barrel 3 from contacting the outside world and preventing the pen tip of the pen barrel 3 from drying out. This allows the marker to be used continuously, not only avoiding waste but also reducing the cost of using the marker.

[0048] Example 2

[0049] Implementing step 1 has prevented the pen tip from contacting the outside environment and drying out, allowing the marker to be used continuously. This not only avoids waste but also reduces the cost of using the marker. However, the line thickness of the drawings and writing on paper varies during the use of the marker, which needs to be addressed using the following solutions.

[0050] Please see Figures 1 to 3 The difference from the previous embodiment lies in that the top of the outer shell 1 is provided with a pen cap 28, the top surface of the outer shell 1 is provided with a fifth thread 25, and the top surface of the outer shell 1 is provided with a small diameter hole 26 and a large diameter hole 27 respectively. The inner wall of the pen cap 28 is provided with threads that match the fifth thread 25. The top surface of the pen cap 28 is provided with an opening 29. The pen cap 28 is composed of a rotatable rubber pen cap 28 with good sealing performance. The end surface of the outer shell 1 has different ventilation holes. The opening 29 is aligned with the small diameter hole 26. Less air enters the small diameter hole 26 through the upper opening 29, resulting in a partial vacuum in the ink inside the pen. At this time, the ink flow rate will be slightly slower, and the characters we write will be smaller. The opening 29 is aligned with the large diameter hole 27. At this time, more air rushes into the large diameter hole 27 through the upper opening 29. At this time, the ink flow rate will be slightly faster, and the characters we write will be thicker. This can change the thickness of the lines of the writing pen.

[0051] The usage steps of this invention are as follows: When using this marker, by rotating the pen cap 28, the opening 29 aligns with different holes on the top surface of the outer shell 1. When writing finer characters, rotating the pen cap 28 aligns the opening 29 with the small-diameter hole 26. Less air enters the small-diameter hole 26 from the upper opening 29, creating a partial vacuum in the ink inside the pen. At this time, the ink flow rate will be slightly slower, and the written characters will be finer. When writing thicker characters, rotating the pen cap 28 aligns the opening 29 with the large-diameter hole 27. At this time, more air flows into the large-diameter hole 27 from the upper opening 29, and the ink flow rate will be slightly faster. The characters we write will be thicker. This solution uses the rotation of the pen cap 28 to align the opening 29 with different holes on the top surface of the outer shell 1. When the opening 29 is aligned with the small diameter hole 26, less air enters the small diameter hole 26 through the upper opening 29, creating a partial vacuum in the ink inside the pen. At this time, the ink flow rate will be slightly slower, and the characters we write will be thinner. When the opening 29 is aligned with the large diameter hole 27, more air flows into the large diameter hole 27 through the upper opening 29, and the ink flow rate will be slightly faster, and the characters we write will be thicker. This allows the pen to change the thickness of the lines, making the pen multifunctional.

[0052] Example 3

[0053] When the ink in our markers runs out, most people simply throw the entire pen away. Only a very small number of people choose to refill it. This is because traditional refilling methods are inefficient and produce poor results, and markers are inexpensive to produce. People are unwilling to waste precious time refilling for such a small economic cost. The following solutions address this issue.

[0054] Please see Figures 2 to 3 The difference from the previous embodiment is that an ink reservoir 30 is fixedly connected to the upper part of the pen barrel 3 on the inner wall of the outer shell 1. An ink outlet tube 31 is provided at the bottom of the ink reservoir 30. The diameter of the ink outlet tube 31 is very small and it is connected to the ink reservoir 30. An ink filling hole 32 is provided on the outer surface of the outer shell 1. The ink filling hole 32 is connected to the ink reservoir 30 and a plug is provided on the outside of the ink filling hole 32. By removing the plug on the outside of the ink filling hole 32, the ink filling hole 32 is connected to the ink reservoir 30. The ink reservoir 30 contains ink. At this time, outside air enters the ink reservoir 30, and the ink in the ink reservoir 30 drips into the ink-absorbing cotton at the top of the pen barrel 3 through the ink outlet tube 31 under its own weight, so that the engineering marker pen can be reused, making the engineering marker pen more environmentally friendly and economical in use.

[0055] The pen barrel 3 is equipped with an ink-absorbing cotton inside. The ink outlet tube 31 is inserted into the ink-absorbing cotton at the top of the pen barrel 3. The ink-absorbing cotton is the commonly used ink-absorbing cotton in the prior art, and the ink-absorbing cotton has good absorption properties.

[0056] The steps for using this invention are as follows: When the engineering marker is in use, after use, during the resetting process of the pen body 3, when the top of the pen body 3 contacts the ink outlet tube 31, the plug on the outside of the ink filling hole 32 is removed. Since the ink filling hole 32 is connected to the ink storage tank 30, and the ink storage tank 30 contains ink, outside air enters the ink storage tank 30. Under its own weight, the ink in the ink storage tank 30 drips through the ink outlet tube 31 into the absorbent cotton at the top of the pen body 3. After ink filling is completed, the plug is then plugged back into the ink filling hole 32. This solution, by removing the plug on the outside of the ink filling hole 32, connecting the ink filling hole 32 to the ink storage tank 30, and allowing outside air to enter the ink storage tank 30, and the ink in the ink storage tank 30 dripping through the ink outlet tube 31 into the absorbent cotton at the top of the pen body 3 under its own weight, enables the engineering marker to be reused, making its use more environmentally friendly and economical.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention 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 invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An engineering marker pen, comprising a casing (1), characterized in that: A fixing seat (2) is fixedly connected to the inner wall of the outer shell (1). A pen barrel (3) that can slide vertically up and down is provided inside the fixing seat (2). A first thread (4) is provided on the inner wall of the bottom end of the outer shell (1). A pen cap (5) is provided below the outer shell (1). A second thread (6) that matches the first thread (4) is provided above the pen cap (5). A connecting plate (7) is provided below the pen cap (5). A third thread (8) is provided on the inner wall of the bottom end of the pen cap (5). The upper part of the connecting plate (7) is... The connecting plate (7) is provided with a fourth thread (9) that matches the third thread (8). A slot (10) is provided inside the connecting plate (7). A protective plate (11) is movably connected inside the slot (10). A push plate (12) is fixedly connected to the end surface of the protective plate (11). A first spring (13) is elastically connected between the protective plate (11) and the inner wall of the slot (10). A slot is provided on the top surface of the connecting plate (7) surrounding the fourth thread (9). The push plate (12) extends to the top of the connecting plate (7) through the slot.

2. The engineering marker pen according to claim 1, characterized in that: The outer shell (1) has a slot (14) on its surface. A connecting rod (15) is movably connected inside the slot (14). One end of the connecting rod (15) is fixedly connected to the surface of the pen barrel (3). The other end of the connecting rod (15) is fixedly connected to a movable seat (16). A second spring (23) is elastically connected between the connecting rod (15) and the fixed seat (2).

3. The engineering marker pen according to claim 2, characterized in that: The bottom surface of the connecting rod (15) is provided with a movable groove (17), and a spring shaft (18) is provided inside the movable groove (17). A locking rod (19) is provided on the surface of the spring shaft (18). The locking rod (19) is rotatably connected to the movable groove (17) through the spring shaft (18). A fixing block (20) is fixedly connected below the groove (14) on the inner wall of the outer shell (1). A ramp rail (21) is provided on the surface of the fixing block (20). A locking groove (22) that engages with the locking rod (19) is provided below the ramp rail (21) on the surface of the fixing block (20). A sliding groove (33) that communicates with the locking groove (22) is provided on the surface of the outer shell (1). A top column (34) is slidably connected inside the rotating shaft sliding groove (33). One end of the top column (34) extends into the locking groove (22), and a button (24) is fixedly connected to the other end of the top column (34).

4. The engineering marker pen according to claim 1, characterized in that: One end of the first spring (13) is fixedly connected to the protective plate (11), and the other end of the first spring (13) is fixedly connected to the inner wall of the slot (10).

5. An engineering marker according to claim 3, characterized in that: A third spring (35) is fitted onto the surface of the top post (34), and the two ends of the third spring (35) are fixedly connected to the inner wall of the slide groove (33) and the button (24) respectively.

6. An engineering marker pen according to claim 2, characterized in that: The pen barrel (3) is fitted with a second spring (23), one end of which is fixedly connected to the fixed base (2), and the other end of which is fixedly connected to the connecting rod (15).

7. An engineering marker pen according to claim 1, characterized in that: The top of the outer shell (1) is provided with a pen cap (28), the top surface of the outer shell (1) is provided with a fifth thread (25), the top surface of the outer shell (1) is provided with a small diameter hole (26) and a large diameter hole (27), the inner wall of the pen cap (28) is provided with a thread that matches the fifth thread (25), and the top surface of the pen cap (28) is provided with an opening (29).

8. An engineering marker pen according to claim 1, characterized in that: An ink reservoir (30) is fixedly connected to the upper part of the pen barrel (3) on the inner wall of the outer shell (1). An ink outlet pipe (31) is provided at the bottom of the ink reservoir (30). The ink outlet pipe (31) is connected to the ink reservoir (30). An ink filling hole (32) is provided on the outer surface of the outer shell (1). The ink filling hole (32) is connected to the ink reservoir (30). A plug is provided on the outside of the ink filling hole (32).

9. An engineering marker pen according to claim 8, characterized in that: The pen barrel (3) is equipped with an ink-absorbing cotton inside, and the ink outlet tube (31) is inserted into the ink-absorbing cotton at the top of the pen barrel (3).

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