Push-pull writing stationery

Abstract

The utility model discloses push-pull type writing stationery which comprises a pen refill and further comprises a pen holder assembly, the pen holder assembly comprises a first push-pull rod and a second push-pull rod, the first push-pull rod and the second push-pull rod are connected together and can slide relatively, and the first push-pull rod is provided with a first threaded part; the driving assembly comprises a rotating part and a driving part, the driving part is provided with a second thread part, one end part of the rotating part is provided with a first thread matching part, and the other end part of the rotating part is provided with a second thread matching part; wherein the driving part is arranged in the second push-pull rod, the first thread matching part is connected with the first thread part, and the second thread matching part is connected with the second thread part; the refill is arranged on the rotating component and is configured to move in the first push-pull rod along with the rotating component. The assembly difficulty is reduced, and the use reliability and the user use experience are improved.

Description

Push-pull writing stationery Technical Field

[0001] This utility model relates to the field of writing instrument technology, and in particular to a push-pull writing stationery. Background Technology

[0002] Currently, writing pens are indispensable stationery in people's daily lives and work. The pen tip needs protection when not in use, and this protection is generally achieved through two methods: push-button writing pens and cap-type writing pens. Chinese Patent Publication No. CN205255813U discloses a fountain pen with a retractable pen tip protection mechanism, using a threaded connection to extend and retract the tip. However, in actual use, on the one hand, the cap needs to be rotated a considerable number of times to extend and retract the tip; on the other hand, even when the tip is retracted, the overall length of the pen is still quite long, making it inconvenient for users to store and carry. Therefore, how to design a technology that is convenient for users to operate and improves portability is the technical problem that this invention aims to solve. Summary of the Invention

[0003] This invention provides a push-pull writing instrument that is convenient for users to operate and use, and improves portability.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This utility model provides a push-pull writing stationery, including a pen refill, and further comprising:

[0006] A pen barrel assembly, the pen barrel assembly including a first push-pull rod and a second push-pull rod, the first push-pull rod and the second push-pull rod being connected together and slidable relative to each other, the first push-pull rod being provided with a first threaded portion;

[0007] A drive assembly, comprising a rotating component and a drive component, wherein the drive component is provided with a second threaded portion, one end of the rotating component is provided with a first threaded engagement portion, and the other end of the rotating component is provided with a second threaded engagement portion;

[0008] The driving component is disposed in the second push-pull rod, the first threaded part is connected to the first threaded part, and the second threaded part is connected to the second threaded part; the pen refill is disposed on the rotating component and configured to follow the rotating component in the first push-pull rod;

[0009] The rotating component is configured such that it rotates one revolution relative to the pen assembly, and the distance the rotating component moves relative to the first push-pull rod is less than the distance the rotating component moves relative to the second push-pull rod.

[0010] In one embodiment, the drive component is configured to follow the movement of the second push-pull rod to drive the rotating component to rotate.

[0011] In one embodiment, the pitch of the first threaded portion is smaller than the pitch of the second threaded portion.

[0012] In one embodiment, the first threaded portion is a first threaded groove formed on the inner wall of the first push-pull rod, and the second threaded portion is a second threaded groove formed on the drive component;

[0013] The first threaded engagement portion is a first sliding protrusion formed on the outer wall of the rotating component, and the second threaded engagement portion is a second sliding protrusion formed on the outer wall of the rotating component;

[0014] The first sliding protrusion is slidably disposed in the first threaded groove, and the second sliding protrusion is slidably disposed in the second threaded groove.

[0015] In one embodiment, the pitch of the first threaded mating portion is smaller than the pitch of the second threaded mating portion.

[0016] In one embodiment, the first threaded engagement portion is a first threaded groove formed on the outer wall of the rotating component, and the second threaded engagement portion is a second threaded groove formed on the outer wall of the rotating component;

[0017] The first threaded portion is a first sliding protrusion formed on the inner wall of the first push-pull rod, and the second threaded engagement portion is a second sliding protrusion formed on the outer wall of the rotating component;

[0018] The first sliding protrusion is slidably disposed in the first threaded groove, and the second sliding protrusion is slidably disposed in the second threaded groove.

[0019] In one embodiment, the first push-pull rod is further provided with a return spring, which is disposed between the pen refill and the first push-pull rod, and is configured to apply a spring force to the pen refill toward the direction of the second push-pull rod.

[0020] In one embodiment, the driving component is further provided with an anti-rotation connection portion, which is connected to the second push-pull rod, and the anti-rotation connection portion is configured to restrict the driving component from rotating relative to the second push-pull rod.

[0021] In one embodiment, one end of the second push-pull rod forms an insertion port, and the other end of the second push-pull rod is provided with a detachable plug, the plug being provided with a slot;

[0022] The first push-pull rod is inserted into the insertion port, and the anti-rotation connection part is a snap-fit ​​protrusion provided on the drive component, which is snapped into the slot.

[0023] In one embodiment, the other end of the second push-pull rod has a locking notch, and the plug has a locking protrusion that engages in the locking notch.

[0024] In one embodiment, a counterweight is provided at the end of the first push-pull rod away from the first threaded portion, and the counterweight is provided with a through hole.

[0025] By incorporating a drive assembly within the pen barrel assembly, the drive component within this assembly moves along with the second push-pull rod. When the pen tip needs to extend beyond the first push-pull rod, pulling the second push-pull rod causes it to slide relative to the first push-pull rod. The drive component moves synchronously with the second push-pull rod without rotating within it. Through the interaction of the second threaded portion and the second threaded mating portion, the linear motion of the drive component is converted into the rotational motion of the rotating component. This rotational motion, through the interaction of the first threaded portion and the first threaded mating portion, is further converted into the linear motion of the first push-pull rod. The rotating component then drives the pen tip to move within the first push-pull rod, allowing it to extend from the rod. Thus, in actual use, the user only needs to push and pull along the length of the push-pull rod to easily extend or retract the pen tip, improving ease of use. Furthermore, since the travel distance of the second push-pull lever is greater than that of the pen refill, when the pen refill retracts in the non-use state, the first and second push-pull levers have a larger overlap area, which shortens the overall length of the push-pull writing stationery when not in use, thereby improving portability. Attached Figure Description

[0026] Figure 1 is a schematic diagram of an embodiment of the writing stationery of this utility model in a retracted state;

[0027] Figure 2 is a cross-sectional view of the writing instrument in Figure 1;

[0028] Figure 3 is a structural schematic diagram of an embodiment of the writing stationery of this utility model in an extended state;

[0029] Figure 4 is a cross-sectional view of the writing instrument in Figure 3;

[0030] Figure 5 is an exploded view of the writing stationery in Figure 1;

[0031] Figure 6 is a schematic diagram of the first push-pull rod in Figure 5;

[0032] Figure 7 is a schematic diagram of the drive component in Figure 5;

[0033] Figure 8 is a schematic diagram of the rotating component in Figure 1.

[0034] Figure label:

[0035] 1. Pen barrel assembly; 11. First push-pull rod; 12. Second push-pull rod;

[0036] 111. First threaded section; 112. Counterweight;

[0037] 121. End cap; 122. Slot; 123. Mounting notch; 124. Second mounting protrusion; 125. Pen clip;

[0038] 2. Drive component; 21. Rotating component; 22. Drive component;

[0039] 211. First threaded mating part; 212. Second threaded mating part;

[0040] 221. Second threaded portion; 222. Anti-rotation connection portion;

[0041] 3. Pen refill; 31. Pen tip. Detailed Implementation

[0042] As shown in Figures 1-8, this utility model provides a push-pull writing stationery, including a pen refill 3, a pen barrel assembly 1, and a drive assembly 2.

[0043] The pen assembly 1 includes a first push-pull rod 11 and a second push-pull rod 12. The first push-pull rod 11 and the second push-pull rod 12 are connected together and can slide relative to each other. The first push-pull rod 11 is provided with a first threaded portion 111.

[0044] The drive assembly 2 includes a rotating component 21 and a drive component 22. The drive component 22 is provided with a second threaded portion 221. One end of the rotating component 21 is provided with a first threaded engagement portion 211, and the other end of the rotating component 21 is provided with a second threaded engagement portion 212.

[0045] The driving component 22 is disposed in the second push-pull rod 12, the first threaded engagement portion 211 is connected to the first threaded portion 111, and the second threaded engagement portion 212 is connected to the second threaded portion 221; the pen refill 3 is disposed on the rotating component 21 and configured to follow the rotating component 21 in the first push-pull rod 11.

[0046] In addition, the drive component 22 is configured to follow the movement of the second push-pull rod 12 to drive the rotating component 21 to rotate.

[0047] Specifically, the pen assembly 1 includes at least a first push-pull rod 11 and a second push-pull rod 12, which are slidably connected together along the length direction. During use, the user can apply a pulling force or a pushing force to the first push-pull rod 11 and the second push-pull rod 12 so that the first push-pull rod 11 and the second push-pull rod 12 slide relative to each other.

[0048] The second push-pull rod 12 is equipped with a drive component 22. The drive component 22 can move with the second push-pull rod 12, but the drive component 22 will not rotate relative to the second push-pull rod 12.

[0049] The rotating component 21 is connected between the driving component 22 and the first push-pull rod 11. The two ends of the rotating component 21 are connected by a threaded part and a threaded mating part to realize the mutual conversion between rotational motion and linear motion. The pen refill 3 inserted in the first push-pull rod 11 will be driven by the rotating component 21, so that the pen tip 31 of the pen refill 3 will extend out of the first push-pull rod 11 to meet the writing requirements.

[0050] Specifically, the explanation will be based on the example of the pen refill 3 retracting into the first push-pull lever 11.

[0051] By applying outward pulling force to the first push-pull rod 11 and the second push-pull rod 12 respectively, the first push-pull rod 11 and the second push-pull rod 12 will slide in opposite directions under the action of the pulling force. At this time, the driving component 22 will move away from the first push-pull rod 11, and during the movement of the driving component 22, the second threaded part 221 and the second threaded mating part 212 cooperate with each other to realize the conversion of the linear motion of the driving component 22 into the rotational motion of the rotating component 21.

[0052] During the pulling process, the rotating component 21 rotates on its own and moves relative to the first push-pull rod 11 due to the interaction between the first threaded part 111 and the first threaded mating part 211. The rotating component 21 will drive the pen refill 3 to move away from the second push-pull rod 12, ultimately allowing the pen tip 31 of the pen refill 3 to protrude from the outside of the second push-pull rod 12.

[0053] Based on a threaded transmission structure, the component structure is simple. Each component connects and transmits power simply by screwing together, greatly reducing processing difficulty and assembly costs, and improving production efficiency. The pen refill 3 is mounted on the rotating component 21 and moves with it in the first push-pull rod 11, while the drive component 22 moves with the second push-pull rod 12 to drive the rotating component 21 to rotate. The threaded connection offers good stability and durability. During use, the rotating component 21, drive component 22, and first push-pull rod 11 transmit motion through the threads, avoiding frequent bending and wear of components, reducing the possibility of malfunctions, significantly improving the reliability of the writing instrument, and extending the product's lifespan.

[0054] By pushing or pulling the second push-pull rod 12, the driving component 22 moves along with the second push-pull rod 12, and the rotating component 21 is driven to rotate by the threaded engagement, thereby moving the pen tip 3 in the first push-pull rod 11, realizing the extension or retraction of the pen tip 31. The threaded drive has the characteristics of smooth transmission and uniform resistance. When operating, the user only needs to apply pushing or pulling force to smoothly control the movement of the pen tip 3 through the rotation of the thread. The operation process is easy and convenient, with a comfortable feel, greatly improving the user experience.

[0055] Furthermore, the rotating component 21 will only rotate when an external force is applied to the first push-pull rod 11 and the second push-pull rod 12 simultaneously. This ensures that the pen tip 31 of the pen refill 3 is always exposed during user use. The rotating component 21 also acts as a self-locking mechanism for the pen refill 3, preventing the pen tip 31 from retracting due to pressure, which is more conducive to improving the user experience.

[0056] In some embodiments, in order to achieve smooth retraction of the pen refill 3, a return spring may be provided in the first push-pull rod 11. The return spring is disposed between the pen refill 3 and the first push-pull rod 11 and is configured to apply a spring force to the pen refill 3 in the direction of the second push-pull rod 12.

[0057] Specifically, during the process of pushing the first push-pull rod 11 and the second push-pull rod 12, the rotating component 21 will move relative to the second push-pull rod 12. Under the action of the return spring, the pen lead 3 will retract into the first push-pull rod 11. As for the installation method of the return spring, you can refer to the spring installation method in a conventional push-pull pen, and it will not be limited or elaborated here.

[0058] In one embodiment of this application, in order to more effectively improve the user experience, improve the smoothness of the push-pull mechanism, and shorten the overall length of the push-pull writing stationery when not in use.

[0059] The rotating component 21 is configured such that the rotating component 21 rotates one revolution relative to the pen assembly 1, and the moving distance of the rotating component 21 relative to the first push-pull rod 11 is less than the moving distance of the rotating component 21 relative to the second push-pull rod 12.

[0060] Specifically, taking the first push-pull rod as a fixed reference, when it is necessary to drive the pen refill 3 to move, the second push-pull rod 12 is pushed and pulled. The second push-pull rod 12 will move relative to the first push-pull rod 11. Under the mutual cooperation of the driving components, the rotating component 21 drives the pen refill 3 to move relative to the first push-pull rod 11.

[0061] Since the rotating component 21 moves a different distance relative to the first push-pull rod and the second push-pull rod in one revolution, the pen tip 3 can move a smaller distance when the second push-pull rod 12 slides a larger distance. This allows the pen tip 3 to move according to the normal moving distance to meet the requirements of extension and retraction, while the second push-pull rod 12 can indirectly drive the pen tip 3 to move by moving a larger distance.

[0062] On the one hand, the sliding stroke of the second push-pull rod 12 is larger, making it more convenient for users to push and pull. On the other hand, when the pen refill 3 is retracted, as shown in Figure 1, the overlapping part of the first push-pull rod 11 and the second push-pull rod 12 is longer, so that the overall length of the pen assembly 1 is shorter, making it more convenient for users to carry and use when going out.

[0063] In one embodiment of this application, in order to more effectively improve the user experience and facilitate push-pull operation, the pitch of the first threaded portion 111 is smaller than the pitch of the second threaded portion 221.

[0064] Specifically, the first threaded portion 111 and the second threaded portion 221 extend along a predetermined helical line. The pitch of the first threaded portion 111 is small, while the pitch of the second threaded portion 221 is large. This allows the rotating component 21 to rotate and move relative to both the first and second push-pull rods 11 simultaneously during the pushing and pulling of the second push-pull rod 12 relative to the first push-pull rod 11. The distance the rotating component 21 moves relative to the first push-pull rod 11 is less than the distance it moves relative to the second push-pull rod 12, thus ensuring that the moving distance of the second push-pull rod 12 is greater than the moving distance of the pen refill 3. This provides the user with a better tactile experience during use.

[0065] In one embodiment, the first threaded portion 111 is a first threaded groove formed on the inner wall of the first push-pull rod 11, and the second threaded portion 221 is a second threaded groove formed on the drive component 22.

[0066] The first threaded engagement portion 211 is a first sliding protrusion formed on the outer wall of the rotating component 21, and the second threaded engagement portion 212 is a second sliding protrusion formed on the outer wall of the rotating component 21;

[0067] The first sliding protrusion is slidably disposed in the first threaded groove, and the second sliding protrusion is slidably disposed in the second threaded groove.

[0068] Specifically, the first push-pull rod 11 and the rotating component 21 cooperate with each other through the first threaded groove and the first sliding protrusion. Similarly, the driving component 22 and the rotating component 21 cooperate with each other through the second threaded groove and the second sliding protrusion.

[0069] During use, after the second push-pull rod 12 slides relative to the first push-pull rod 11, the first sliding protrusion slides in the first threaded groove to achieve a corresponding moving distance of the first push-pull rod 11 relative to the rotating component 21. Similarly, the driving component 22 moves a corresponding distance relative to the rotating component 21.

[0070] Wherein, the pitch of the first thread groove is less than the pitch of the second thread groove, so that the rotating component 21 is configured to rotate one revolution relative to the pen assembly 1 along the length direction of the pen assembly 1, and the moving distance of the rotating component 21 relative to the first push-pull rod 11 is less than the moving distance of the rotating component 21 relative to the second push-pull rod 12.

[0071] Specifically, during the process of the user pushing and pulling the second push-pull rod 12 relative to the first push-pull rod 11, the distance the second push-pull rod 12 moves will be greater than the distance the pen refill 3 moves. This allows the user to have a greater push-pull stroke when pushing and pulling the second push-pull rod 12, thus achieving a better user experience. At the same time, due to the small pitch of the first threaded groove, the pen refill 3 moves a smaller distance when the second push-pull rod 12 moves a larger distance, ensuring that the pen refill 3 does not extend or retract excessively. This further enhances the user experience while satisfying the normal extension and retraction of the pen refill 3.

[0072] In one embodiment, the driving component 22 is a tubular structure, and the inner wall of the driving component 22 is provided with the second threaded groove. The rotating component 21 is inserted into the driving component 22 and can rotate and move within the driving component 22.

[0073] Specifically, the drive component 22 has a tubular structure. When the drive component 22 is installed into the second push-pull rod 12, the drive component 22 can fit more closely to the inner wall of the second push-pull rod 12, thereby improving the assembly accuracy and reliability.

[0074] Furthermore, the inner wall of the driving component 22 is provided with two second threaded grooves;

[0075] The other end of the rotating component 21 is provided with two second sliding protrusions, which are arranged in opposite directions and are slidably disposed in the corresponding second threaded grooves.

[0076] Specifically, two second threaded grooves are used to guide the relative sliding of the second sliding protrusion. On the one hand, the driving component 22 can provide a more balanced rotational driving force to the rotating component 21. On the other hand, it can also guide the rotation more smoothly, ensuring that the rotating component 21 rotates and moves smoothly.

[0077] Correspondingly, the first threaded groove provided on the first push-pull rod 11 can also be configured with two threads, and the rotating component 21 is provided with a first sliding protrusion that cooperates with the first threaded groove.

[0078] In one embodiment, the rotating component 21 is a tubular structure, and the first sliding protrusion and the second sliding protrusion are disposed on the outer tube wall of the rotating component 21;

[0079] The pen refill 3 is inserted into the rotating component 21.

[0080] Specifically, the rotating component 21 can adopt a tubular structure, which can better match and connect with the driving component 22 and the first push-pull rod 11, ensuring that the rotating component 21 can rotate and move smoothly.

[0081] Furthermore, the rotating component 21 is provided with a hollow structure. Specifically, the hollow structure of the rotating component 21 can more effectively reduce the weight of the rotating component 21, and can further reduce manufacturing costs.

[0082] Furthermore, in order to accommodate the different pitches of the first and second threaded grooves, the following structural improvements are made to the first and second sliding protrusions.

[0083] The first sliding protrusion and the second sliding protrusion have a strip-shaped structure;

[0084] The first sliding protrusion forms a first included angle α with the rotation axis of the rotating component 21 along the circumferential direction;

[0085] The second sliding protrusion forms a second included angle b with the rotation axis of the rotating component 21 along the circumferential direction;

[0086] The first included angle is greater than the second included angle.

[0087] Specifically, taking the writing instrument placed vertically as an example, the tilt angle of the first sliding protrusion relative to the horizontal plane is smaller than that of the second sliding protrusion relative to the horizontal plane. During the pushing and pulling of the first push-pull rod 11 and the second push-pull rod 12, the different tilt angles of the first and second sliding protrusions ensure that the moving distance of the second push-pull rod 12 relative to the first push-pull rod 11 is greater than the moving distance of the rotating component 21 relative to the first push-pull rod 11, thereby improving the user's feel when pushing and pulling the rods.

[0088] Similarly, in another embodiment of this application, in order to more effectively improve the user experience and facilitate push-pull operation, the pitch of the first threaded mating part 211 is smaller than the pitch of the second threaded mating part 212.

[0089] Specifically, the first threaded engagement portion 211 and the second threaded engagement portion 212 extend along a predetermined spiral line. The pitch of the first threaded engagement portion 211 is small, while the pitch of the second threaded engagement portion 212 is large. This allows the rotating component 21 to rotate and move relative to both the first and second push-pull rods 11 during the pushing and pulling of the second push-pull rod 12. The distance the rotating component 21 moves relative to the first push-pull rod 11 is less than the distance it moves relative to the second push-pull rod 12, thus ensuring that the moving distance of the second push-pull rod 12 is greater than the moving distance of the pen refill 3. This provides the user with a better tactile experience during use.

[0090] In some embodiments, the first threaded engagement portion 211 is a third threaded groove formed on the outer wall of the rotating component 21, and the second threaded engagement portion 212 is a fourth threaded groove formed on the outer wall of the rotating component 21.

[0091] The first threaded portion 111 is a third sliding protrusion formed on the inner wall of the first push-pull rod 11, and the second threaded engagement portion 212 is a fourth sliding protrusion formed on the outer wall of the rotating component 21;

[0092] The third sliding protrusion is slidably disposed in the third threaded groove, and the fourth sliding protrusion is slidably disposed in the fourth threaded groove.

[0093] Regarding the engagement method between the third threaded groove and the third sliding protrusion, and the engagement method between the fourth threaded groove and the fourth sliding protrusion, please refer to the above description of the first threaded groove, the second threaded groove, the first sliding protrusion, and the second sliding protrusion, and there will be no further elaboration or limitation here.

[0094] In another embodiment of this application, the driving component 22 is further provided with an anti-rotation connection 222, which is connected to the second push-pull rod 12. The anti-rotation connection 222 is configured to restrict the driving component 22 from rotating relative to the second push-pull rod 12.

[0095] Specifically, the drive component 22 needs to be able to move with the second push-pull rod 12 and simultaneously provide rotational driving force to the rotating component 21. Therefore, the drive component 22 cannot rotate within the second push-pull rod 12. An anti-rotation connection 222 is provided on the drive component 22, which cooperates with the second push-pull rod 12 to restrict rotation of the drive component 22 relative to the second push-pull rod 12. In this way, the drive component 22 can provide an effective and reliable driving force to the rotating component 21.

[0096] In some embodiments, one end of the second push-pull rod 12 forms an insertion port, and the other end of the second push-pull rod 12 is provided with a detachable plug 121, and the plug 121 is provided with a slot 122;

[0097] The first push-pull rod 11 is inserted into the insertion port, and the anti-rotation connection part 222 is a first snap-fit ​​protrusion provided on the drive component 22, which is snapped into the slot 122.

[0098] Specifically, during the actual assembly process, the drive component 22 is inserted into the second push-pull rod 12 through the insertion port and connected to the plug 121 on the second push-pull rod 12. The first snap-fit ​​protrusion on the drive component 22 will be snapped into the slot 122 provided in the plug 121 to complete the assembly of the drive component 22 into the second push-pull rod 12.

[0099] As the drive component 22 is assembled by engaging with the slot 122 through the first mounting protrusion, on the one hand, the drive component 22 is fixedly installed in the second push-pull rod 12 to meet the requirement of moving with the second push-pull rod 12, and on the other hand, the drive component 22 is restricted by the plug 121 and will not rotate relative to the second push-pull rod 12.

[0100] Furthermore, in order to facilitate the fixed connection between the second push-pull rod 12 and the plug 121, a locking notch 123 is provided at the other end of the second push-pull rod 12, and a second locking protrusion 124 is provided on the plug 121, which is engaged in the locking notch 123.

[0101] Specifically, after the plug 121 is assembled onto the second push-pull rod 12, the second snap-fit ​​protrusion 124 on the plug 121 will snap into the snap-fit ​​notch 123 on the second push-pull rod 12.

[0102] Additionally, a pen clip 125 can be configured on the end cap 121 as needed, allowing users to clip writing instruments onto books for use.

[0103] In one embodiment, a counterweight 112 is provided at the end of the first push-pull rod 11 away from the first threaded portion 111, and the counterweight 112 is provided with a through hole (not marked).

[0104] Specifically, the counterweight 112 is mounted on the first push-pull rod 11. During use, because the counterweight 112 is close to the pen tip 31 of the pen refill 3, the center of gravity of the written document is lower, preventing the center of gravity from shifting upwards due to the extended distance of the second push-pull rod 12. This improves the writing feel for the user. In actual operation, after the user pulls the first push-pull rod 11 and the second push-pull rod 12, the pen tip 31 of the pen refill 3 will extend to the outside through the through hole to meet the user's writing requirements.

[0105] By setting a drive assembly 2 in the pen barrel assembly 1, the drive component 22 in the drive assembly 2 can move together with the second push-pull rod 12. When the pen tip 31 of the pen refill 3 needs to be extended outside the first push-pull rod 11, the second push-pull rod 12 is pulled to slide relative to the first push-pull rod 11. The drive component 22 will move synchronously with the second push-pull rod 12 and will not rotate in the second push-pull rod 12. Under the mutual cooperation of the second threaded part 221 and the second threaded mating part 212, the linear motion of the drive component 22 is converted into linear motion by the threaded engagement. The rotational motion of the rotating component 21, through the interaction of the first threaded part 111 and the first threaded mating part 211, converts the rotational motion of the rotating component 21 into the linear motion of the first push-pull rod 11. This allows the rotating component 21 to drive the pen refill 3 to move within the first push-pull rod 11, so that the pen refill 3 extends out of the first push-pull rod 11. The overall structure of the drive assembly 2 is simple, and the spiral groove mating method makes it more reliable during use, thereby improving the user experience.

[0106] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A push-pull writing instrument, comprising a pen refill, characterized in that, Also includes: A pen barrel assembly includes a first push-pull rod and a second push-pull rod, which are connected together and can slide relative to each other. The first push-pull rod has a first threaded portion. A drive assembly includes a rotating component and a drive component. The drive component has a second threaded portion. One end of the rotating component has a first threaded engagement portion, and the other end of the rotating component has a second threaded engagement portion. The drive component is configured to follow the movement of the second push-pull rod to drive the rotating component to rotate. The drive component is disposed in the second push-pull rod, and the first threaded engagement portion is connected to the first threaded portion, and the second threaded engagement portion is connected to the second threaded portion. A pen refill is disposed on the rotating component and configured to follow the rotating component in the first push-pull rod. The rotating component is configured such that the rotating component rotates one revolution relative to the pen barrel assembly, and the distance the rotating component moves relative to the first push-pull rod is less than the distance the rotating component moves relative to the second push-pull rod.

2. The push-pull writing instrument according to claim 1, characterized in that, The pitch of the first threaded portion is less than the pitch of the second threaded portion.

3. The push-pull writing instrument according to claim 2, characterized in that, The first threaded portion is a first threaded groove formed on the inner wall of the first push-pull rod, and the second threaded portion is a second threaded groove formed on the drive component; the first threaded mating portion is a first sliding protrusion formed on the outer wall of the rotating component, and the second threaded mating portion is a second sliding protrusion formed on the outer wall of the rotating component; the first sliding protrusion is slidably disposed in the first threaded groove, and the second sliding protrusion is slidably disposed in the second threaded groove.

4. The push-pull writing instrument according to claim 1, characterized in that, The pitch of the first threaded mating part is less than the pitch of the second threaded mating part.

5. The push-pull writing instrument according to claim 4, characterized in that, The first threaded engagement portion is a first threaded groove formed on the outer wall of the rotating component, and the second threaded engagement portion is a second threaded groove formed on the outer wall of the rotating component; the first threaded portion is a first sliding protrusion formed on the inner wall of the first push-pull rod, and the second threaded engagement portion is a second sliding protrusion formed on the outer wall of the rotating component; the first sliding protrusion is slidably disposed in the first threaded groove, and the second sliding protrusion is slidably disposed in the second threaded groove.

6. The push-pull writing instrument according to any one of claims 1-5, characterized in that, The first push-pull rod is also provided with a return spring, which is disposed between the pen refill and the first push-pull rod, and is configured to apply a spring force to the pen refill toward the direction of the second push-pull rod.

7. The push-pull writing instrument according to any one of claims 1-5, characterized in that, The drive component is also provided with an anti-rotation connection part, which is connected to the second push-pull rod. The anti-rotation connection part is configured to restrict the drive component from rotating relative to the second push-pull rod.

8. The push-pull writing instrument according to claim 7, characterized in that, One end of the second push-pull rod forms an insertion port, and the other end of the second push-pull rod is provided with a detachable plug, the plug being provided with a slot; the first push-pull rod is inserted into the insertion port, and the anti-rotation connection part is a snap-fit ​​protrusion provided on the drive component, the snap-fit ​​protrusion being snapped into the slot.

9. The push-pull writing instrument according to claim 8, characterized in that, The other end of the second push-pull rod has a locking notch, and the plug has a locking protrusion that engages in the locking notch.

10. The push-pull writing instrument according to claim 1, characterized in that, The end of the first push-pull rod away from the first threaded portion is also provided with a counterweight block, and the counterweight block is provided with a through hole.

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