pen

Abstract

The application relates to a pen. The pen comprises a shell part, a refill part, a driving part and a rubber part. The shell part comprises an upper shell and a lower shell connected along the extension direction of the axis of the pen. The upper shell and the lower shell surround a containing space of the shell part along the axis. The refill part is arranged on one side of the containing space close to the lower shell. The driving part is arranged on one side of the containing space close to the upper shell. One end of the driving part is in abutment with the refill part. The upper shell can rotate around the axis and drive the driving part to move towards or away from the refill part. The rubber part is wrapped on one side of the shell part away from the containing space. One end of the rubber part is fixed with the upper shell and the other end is fixed with the lower shell.

Description

Technical Field

[0001] This application relates to the field of stationery, and more particularly to a pen. Background Technology

[0002] Currently, the most common types of pens on the market are those that allow the refill to be pushed out by pressing and those that allow the refill to be exposed by opening the cap. Pens with push-out refills are prone to having the refill pushed out by external force when placed in a bag or clothing pocket, potentially staining the fabric and causing an unpleasant experience for the user. Pens with open caps, on the other hand, require the user to close the cap after writing, otherwise, problems such as lost caps or damaged refills can occur, also causing inconvenience for users. Utility Model Content

[0003] This application provides a pen to address some or all of the shortcomings of the related art.

[0004] This application provides a pen, including:

[0005] The housing includes an upper housing and a lower housing connected along the extension direction of the pen's axis; the upper housing and the lower housing surround a receiving space of the housing portion around the axis;

[0006] The pen refill portion is located on the side of the receiving space near the lower housing;

[0007] A driving unit is disposed on the side of the receiving space near the upper housing; one end of the driving unit abuts against the pen lead portion; the upper housing is rotatable about the axis, thereby driving the driving unit to move toward or away from the pen lead portion; and,

[0008] The rubber-coated portion is wrapped around the side of the housing portion away from the receiving space; one end of the rubber-coated portion is fixed to the upper housing and the other end is fixed to the lower housing.

[0009] Furthermore, the housing portion includes a groove unit disposed on the surface of the housing portion away from the receiving space; the groove unit extends along the extending direction; the groove unit includes a plurality of groove units; the plurality of groove units are evenly distributed around the axis.

[0010] Furthermore, the housing portion includes a protruding unit disposed on the end surface in the extending direction; the protruding unit extends perpendicular to the extending direction; and the overmolded portion covers the protruding unit.

[0011] Furthermore, the coating portion is a silicone coating portion, a thermoplastic elastomer coating portion, a thermoplastic rubber coating portion, or a polyvinyl chloride coating portion.

[0012] Furthermore, the wall thickness of the coated portion is greater than or equal to 0.8 mm and less than or equal to 2 mm.

[0013] Furthermore, the Shore hardness of the overmolded portion is greater than or equal to 15HA and less than or equal to 90HA.

[0014] Furthermore, the coated portion includes a gripping plane; the gripping plane is disposed on the side of the coated portion away from the housing portion; the gripping plane includes a plurality of gripping planes; the plurality of gripping planes are evenly distributed around the axis.

[0015] Furthermore, the upper housing has a housing opening communicating with the receiving space at one end away from the lower housing; the coated portion includes a coated opening communicating with the housing opening; the pen further includes:

[0016] The sealing part extends from the rubber-coated opening to the housing opening and engages with the wall of the upper housing facing the receiving space.

[0017] Furthermore, the upper housing also includes a boss unit extending toward the receiving space; the end of the sealing portion away from the rubber-coated opening abuts against the boss unit; wherein the rubber-coated portion is disposed between the upper housing and the sealing portion, and wraps around the periphery of the sealing portion.

[0018] Furthermore, the driving part includes a driving protrusion; the upper housing includes a driving groove disposed on one side of the receiving space; one end of the driving protrusion away from the lower housing abuts against the driving groove; when the driving part rotates around the axis, the driving groove drives the driving protrusion to move along the extending direction.

[0019] The technical solutions provided by the embodiments of this application may include the following beneficial effects:

[0020] As can be seen from the above embodiments, the pen's state switching in this application is achieved by rotating the upper shell. When the pen is subjected to a force along its extension direction, the pen tip will not switch between the active and retracted states under the influence of external force. Furthermore, the pen's state switching does not require disassembling the cap or other structures from the shell; the pen can switch states as a whole, thus helping to avoid damage to the pen tip during storage due to the loss of disassembled parts during pen use. The rubber coating improves the user's hand comfort when holding the lower shell for writing, preventing hand pain and discomfort caused by prolonged contact between the hand and the hard shell.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this application. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 The diagram shows an overall schematic of an embodiment of the pen of this application; where (a) is the collapsed state and (b) is the used state;

[0024] Figure 2 A schematic cross-sectional view is shown as an embodiment of the pen of this application;

[0025] Figure 3 A partial cross-sectional schematic diagram showing the location of the upper housing of an embodiment of the pen of this application is shown;

[0026] Figure 4 A partial cross-sectional schematic diagram showing the location of the lower housing of an embodiment of the pen of this application is shown;

[0027] Figure 5 A partial schematic diagram showing the location of the upper housing of an embodiment of the pen of this application is shown, wherein Figure 4 Conceal the rubber coating area;

[0028] Figure 6 A schematic cross-sectional view is shown for one embodiment of the upper housing of the pen of this application;

[0029] Figure 7 Shown as Figure 6 A cross-sectional view of the upper shell from another angle is shown;

[0030] Figure 8 The diagram shows an overall schematic representation of one embodiment of the pen's drive unit according to this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100. Pen, 1. Housing part, 11. Upper housing, 111. Housing opening, 112. Boss unit, 113. Drive groove, 114. Upper snap-fit ​​protrusion, 115. Lower snap-fit ​​protrusion, 116. Grip groove, 12. Lower housing, 121. Lower mating protrusion, 13. Accommodation space, 14. Pen tip housing, 15. Groove unit, 16. Protrusion unit, 2. Pen core part, 3. Drive part, 31. Drive protrusion, 32. Hollow cavity, 4. Coated part, 41. Grip plane, 42. Coated opening, 5. Sealing part, 51. Upper mating protrusion, 6. Reset part, A-axis, Z-extension direction. Detailed Implementation

[0033] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0034] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0035] refer to Figures 1 to 3 This application provides a pen 100. The pen 100 includes a housing portion 1, a pen refill portion 2, a drive portion 3, and an overmolded portion 4. The housing portion 1 includes an upper housing 11 and a lower housing 12 connected along the extension direction Z of the axis A of the pen 100. The upper housing 11 and the lower housing 12 surround a receiving space 13 around the axis A of the housing portion 1. The pen refill portion 2 is disposed in the receiving space 13 near the lower housing 12. The drive portion 3 is disposed in the receiving space 13 near the upper housing 11. One end of the drive portion 3 abuts against the pen refill portion 2. The upper housing 11 is rotatable around the axis A, driving the drive portion 3 to move toward or away from the pen refill portion 2. The overmolded portion 4 covers the side of the housing portion 1 away from the receiving space 13. One end of the overmolded portion 4 is fixed to the upper housing 11, and the other end is fixed to the lower housing 12.

[0036] like Figure 1 As shown in (a), the pen 100 is in the retracted state. When the user needs to use the pen 100, by rotating the upper housing 11 around axis A, the drive unit 3 can move toward the pen tip 2, thereby pushing the pen tip 2, which is in contact with the drive unit 3, until the pen tip 2 protrudes from the housing 1, i.e., switching to the retracted state. Figure 1 The usage state is shown in (b). When the user wants to switch the pen 100 from the usage state to the stowed state, the upper housing 11 can be rotated in the opposite direction, so that the drive unit 3 moves away from the pen core 2, thereby allowing the pen core 2 to move into the storage space in the direction of the drive unit 3.

[0037] The state switching of the pen 100 is achieved by rotating the upper housing 11. When the pen 100 is subjected to a force along the extension direction Z, the pen tip 2 will not switch between the active state and the retracted state under the action of external force. In addition, the state switching of the pen 100 does not require disassembling the cover or other structures from the housing 1; the pen 100 can switch states as a whole, which helps to avoid damage to the pen tip 2 during storage due to the loss of disassembled parts during the use of the pen 100.

[0038] The rubber coating 4 improves hand comfort when writing on the lower shell 12, preventing hand pain and discomfort caused by prolonged contact with the hard shell 1. Furthermore, since the rubber coating 4 covers the shell 1 and is fixed at one end to the upper shell 11 and the other end to the lower shell 12, it can be in a twisted state when the pen 100 is in use. This change in shape not only enhances the user experience but also allows the user to determine the pen 100's status by its appearance. When the rubber coating 4 is twisted, the user can tell that the pen tip 2 is protruding from the shell 1, allowing the user to switch the pen 100 to a stowed state before storing it in a bag, thus preventing the pen tip 2 from causing damage inside the bag.

[0039] Optionally, the overmolded portion 4 can be a silicone overmolded portion 4, a thermoplastic elastomer overmolded portion 4, a thermoplastic rubber overmolded portion 4, or a polyvinyl chloride overmolded portion 4. Silicone has a soft and delicate feel, good elasticity, and is less tiring to hold and write for extended periods. Thermoplastic elastomers and thermoplastic rubbers combine the processing properties of both plastics and rubbers, while also providing excellent anti-slip properties. Polyvinyl chloride can have its hardness adjusted by adding plasticizers, and it is inexpensive, which helps control production costs.

[0040] Optionally, the wall thickness of the rubber coating 4 is greater than or equal to 0.8 mm and less than or equal to 2 mm. For example, the wall thickness can be any value between 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, and 2.0 mm. If the wall thickness of the rubber coating 4 is too small, it is prone to breakage during use. If the wall thickness of the rubber coating 4 is too large, it is difficult to produce torsional deformation when the pen 100 switches between the use state and the retracted state. The wall thickness within this range provides a more comfortable grip cushioning while avoiding the problems of breakage or difficulty in deformation of the rubber coating 4.

[0041] Optionally, the Shore hardness of the rubber coating 4 is greater than or equal to 15 HA and less than or equal to 90 HA. For example, the Shore hardness can be any value between 15 HA, 20 HA, 25 HA, 30 HA, 35 HA, 40 HA, 45 HA, 50 HA, 55 HA, 60 HA, 65 HA, 70 HA, 75 HA, 80 HA, 85 HA, and 90 HA. A lower Shore hardness allows the rubber coating to have a soft touch, is less prone to deformation during prolonged grip, and is suitable for children or users who require gentle operation. A higher Shore hardness results in less deformation of the rubber coating 4 when the user holds the pen 100, allowing for more precise control. Those skilled in the art can adjust the Shore hardness of the rubber coating 4 according to factors such as the target group of the pen 100.

[0042] The overmolded portion 4 can have a uniform thickness. Or, as... Figure 1 As shown in the embodiment, the coated portion 4 includes a gripping surface 41. The gripping surface 41 is disposed on the side of the coated portion 4 away from the housing portion 1. Multiple gripping surfaces 41 are included. These multiple gripping surfaces 41 are evenly distributed around axis A. The arrangement of the multiple gripping surfaces 41 ensures that when the pen 100 is in use, due to the twisting of the coated portion 4, the gripping surfaces 41 at the end near the lower housing 12 can form a gripping position that is favorable for finger gripping, and the twisting of the middle of the pen 100 allows the pen 100 to more mechanically rest against the web of the hand. This arrangement improves the gripping comfort of the pen 100, thereby reducing hand discomfort during prolonged use. Furthermore, the arrangement of the gripping surfaces 41 further amplifies the visual effect of the coated portion 4 twisting, making it easier for the user to judge the state of the pen 100.

[0043] exist Figure 1 In the illustrated embodiment, the gripping plane 41 includes two. In other embodiments, the gripping plane 41 may include three, allowing the user's thumb and index finger to pinch different gripping planes 41 while holding the pen 100, and to rest another gripping plane 41 of the pen 100 against the middle finger. Of course, the number of gripping planes 41 can also be greater, so that the pen 100 presents a polygonal shape on the outer periphery of a cross-section perpendicular to axis A. This application is not limiting.

[0044] refer to Figure 3In some optional embodiments, the upper housing 11 has a housing opening 111 communicating with the receiving space 13 at the end away from the lower housing 12. The housing opening 111 facilitates the molding of the receiving space 13 during the injection molding process of the upper housing 11, avoiding excessive core-pulling distance requirements that would increase mold costs. The overmolding part 4 includes an overmolding opening 42 communicating with the housing opening 111. The overmolding opening 42 facilitates the release of air from the inside of the overmolding part 4 when the assembly personnel fit the overmolding part 4 onto the outside of the housing part 1, thereby improving the tightness of the fit between the overmolding part 4 and the housing part 1 and the assembly efficiency. In this embodiment, the pen 100 also includes a sealing part 5. The sealing part 5 extends from the overmolding opening 42 to the housing opening 111 and engages with the wall of the upper housing 11 facing the receiving space 13. By setting the sealing part 5, the rigidity of the shell opening 111 of the pen 100 is increased, and external dirt can be prevented from entering the receiving space 13 through the rubber opening 42 and the shell opening 111, causing damage to components such as the drive part 3 and the pen refill part 2.

[0045] The snap-fit ​​connection between the sealing part 5 and the upper housing 11 can be of various types. For example... Figure 3 As shown, the upper housing 11 includes an upper snap-fit ​​protrusion 114 disposed on one side of the receiving space 13. The sealing portion 5 includes an upper mating protrusion 51 that engages with the upper snap-fit ​​protrusion 114. The upper mating protrusion 51 abuts against the upper snap-fit ​​protrusion 114 on the side of the upper snap-fit ​​protrusion 114 away from the housing opening 111. Thus, the movement of the sealing portion 5 away from the receiving space 13 along axis A is limited by the upper snap-fit ​​protrusion 114. In other embodiments, the upper housing 11 may include a groove disposed on one side of the receiving space 13, in which the upper mating protrusion 51 snaps. Alternatively, the sealing portion 5 may include a groove in which the upper snap-fit ​​protrusion 114 is located.

[0046] The sealing portion 5 may be rigidly connected to the upper housing 11 on one side of the housing opening 111, such that the movement of the sealing portion 5 along axis A toward the receiving space 13 is restricted by the end of the upper housing 11. Or as... Figure 3 As shown, the upper housing 11 also includes a boss unit 112 extending toward the receiving space 13. The end of the sealing portion 5 away from the adhesive opening 42 abuts against the boss unit 112. The adhesive portion 4 is disposed between the upper housing 11 and the sealing portion 5, and covers the periphery of the sealing portion 5. In other words, in this embodiment, an adhesive portion 4 is provided between the sealing portion 5 and the end of the upper housing 11, and the movement of the sealing portion 5 toward the receiving space 13 along axis A is restricted by the boss unit 112. With this arrangement, the sealing portion 5 can be used to fix the adhesive portion 4, preventing the adhesive portion 4 from moving toward the lower housing 12 through the adhesive opening 42, thus preventing displacement of the adhesive portion 4.

[0047] refer to Figure 4The lower housing 12 can actually be connected to the upper housing 11 to form a receiving space 13. However, in some embodiments, the housing part 1 also includes a pen tip housing 14. The pen tip housing 14 is connected to the side of the lower housing 12 away from the upper housing 11, and a portion of the rubber-coated part 4 is located between the lower housing 12 and the pen tip housing 14. With this arrangement, the end of the rubber-coated part 4 away from the upper housing 11 can be clamped and fixed by the pen tip housing 14 and the lower housing 12. The pen tip housing 14 and the lower housing 12 can be connected by a thread as shown in the figure, or they can be connected by a snap-fit ​​connection similar to the sealing part 5 and the upper housing 11. This application is not limited to this.

[0048] In the embodiment where the pen tip housing 14 and the lower housing 12 are connected by threads, when the pen core 2 is fitted with a reset member 6 to reset the pen 100 from the use state to the retracted state, the threaded connection can prevent the pen tip housing 14 from being disassembled and reassembled with the lower housing 12 under the action of the elastic force of the reset member 6.

[0049] Combination Figure 5 In some optional embodiments, the housing portion 1 includes a groove unit 15 disposed on the surface of the housing portion 1 away from the receiving space 13. The groove unit 15 extends along the extending direction Z, and there are multiple groove units 15. The multiple groove units 15 are evenly distributed around the axis A. The arrangement of the groove unit 15 can reduce the contact area between the rubber-coated portion 4 and the housing portion 1, thereby reducing the friction between the rubber-coated portion 4 and the housing portion 1, and preventing the rubber-coated portion 4 from adhering to the surface of the housing portion 1 when the user rotates the upper housing 11, thus affecting the rotation effect.

[0050] exist Figure 5 In the illustrated embodiment, the groove units 15 are distributed on the upper housing 11 and the lower housing 12, thereby reducing the overall contact area between the coated portion 4 and the housing portion 1. In other embodiments, the groove units 15 may be distributed only on the upper housing 11 or only on the lower housing 12, and this application is not limited in this regard.

[0051] exist Figure 5 In the illustrated embodiment, the upper housing 11 further includes a grip groove 116. The grip groove 116 extends about axis A, thereby interrupting the extension of part of the recessed unit 15. The grip groove 116 forms a small, flat surface on the upper housing 11, allowing the user to grip the upper housing 11 when rotating it, thus improving hand comfort. Optionally, multiple grip grooves 116 are included. The multiple grip grooves 116 are evenly distributed around axis A, allowing the user to comfortably grip and rotate the upper housing 11 using two fingers in multiple positions.

[0052] The overmolded portion 4 needs to be able to move relative to the housing portion 1 to achieve torsion. Simultaneously, the overmolded portion 4 also needs to be fixed to the housing portion 1 to achieve the torsion effect. In some optional embodiments, the housing portion 1 includes a protruding unit 16 disposed on its end surface in the extension direction Z. The protruding unit 16 extends perpendicular to the extension direction Z. The overmolded portion 4 encloses the protruding unit 16. Since the protruding unit 16 extends perpendicular to the extension direction Z, and the overmolded portion 4 encloses the protruding unit 16, when the overmolded portion 4 rotates around axis A, the frictional force between the protruding unit 16 and the overmolded portion 4 can limit the rotational movement of the overmolded portion 4 connected to it around axis A. Because the protruding unit 16 is disposed on the end surface of the housing portion 1, the fixed connection point between the overmolded portion 4 and the housing portion 1 is as far away as possible from the middle section of the pen 100, thereby improving the torsion effect of the overmolded portion 4 and the force required for the protruding unit 16 to fix the overmolded portion 4.

[0053] Figure 5 The illustrated embodiment only shows the protruding unit 16 at the position of the upper housing 11. However, it should be understood that the lower housing 12 may also be provided with protruding units 16. Furthermore, this application does not limit the number of protruding units 16. Increasing the number of protruding units 16 increases the friction between the adhesive portion 4 and the housing portion 1, thus improving the fixing effect of the adhesive portion 4. Reducing the number of protruding units 16 decreases the friction between the adhesive portion 4 and the housing portion 1, but reduces the assembly difficulty between the adhesive portion 4 and the housing portion 1. Those skilled in the art can select the number of protruding units 16 based on the torsion angle between the upper housing 11 and the lower housing 12 and the hardness of the material of the adhesive portion 4.

[0054] Combination Figure 3 , Figures 6 to 8 The rotational connection between the upper housing 11 and the lower housing 12 can be achieved through threaded rotation. Alternatively, as shown in the attached figures, the upper housing 11 includes a lower snap-fit ​​protrusion 115 on one side of the receiving space 13. The lower housing 12 is disposed inside the upper housing 11 and includes a lower mating protrusion 121 that mates with the lower snap-fit ​​protrusion 115. The lower mating protrusion 121 abuts against the lower snap-fit ​​protrusion 115 on the side near the housing opening 111. This arrangement allows rotation between the upper housing 11 and the lower housing 12 without causing a change in their relative positions in the extension direction Z. Of course, the rotational connection between the upper housing 11 and the lower housing 12 can also be achieved through the engagement of a groove and a protrusion. This application is not limited to this.

[0055] Regarding the driving of the pen refill portion 2 by the driving unit 3, in some optional embodiments, the driving unit 3 includes a driving protrusion 31. The upper housing 11 includes a driving groove 113 disposed on one side of the receiving space 13. The end of the driving protrusion 31 away from the lower housing 12 abuts against the driving groove 113. When the driving unit 3 rotates about axis A, the driving groove 113 drives the driving protrusion 31 to move along the extending direction Z. The shape of the driving groove 113 can be referenced. Figure 6 and Figure 7 As shown. The drive groove 113 is in Figure 6 As shown in the figure, from right to left, the end face of the drive groove 113 extends away from the housing opening 111. In the position shown, from right to left, the end face of the drive groove 113 first extends away from the housing opening 111, then extends closer to the housing opening 111. Thus, when the drive protrusion 31 abuts against the drive groove 113 and the upper housing 11 rotates, the drive groove 113 moves the drive protrusion 31 towards the pen tip 2, thereby pushing the pen tip 2 away from the receiving space 13. Subsequently, the drive groove 113 moves the drive protrusion 31 slightly away from the pen tip 2, causing the drive protrusion 31 to engage with... Figure 7 The small groove shown allows the upper housing 11 to pivot under the application of a certain external force, thereby driving the drive protrusion 31 to leave the groove.

[0056] This setup is simple and allows those skilled in the art to adjust the shape of the drive groove 113 according to the lead ejection speed and movement trajectory requirements of the lead 2. For example, those skilled in the art can adjust the angle at which the upper housing 11 needs to rotate when switching between the pen 100's active and retracted states by adjusting the shape and slope of the drive groove 113. When the slope angle of the drive groove 113 is large, the upper housing 11 may only need to rotate a small angle such as 45 or 50 degrees to achieve the switching between the retracted and active states of the pen 100. When the slope angle of the drive groove 113 is small, the upper housing 11 may need to rotate 170 or 180 degrees to achieve the switching between the retracted and active states of the pen 100. Optionally, the rotation angle of the upper housing 11 can be between 45 and 180 degrees. It is easy to understand that the smaller the rotation angle, the smaller the angle that the user needs to rotate when switching the pen 100 between the active and retracted states, making operation easier. The larger the rotation angle, the greater the rotation stroke of the upper shell 11 and the greater the torsion angle of the rubber-coated part 4, which may improve the visual effect and grip.

[0057] The drive protrusions 31 can include multiple protrusions, and correspondingly, the drive grooves 113 can also include multiple grooves. Increasing the number of drive protrusions 31 can improve the smoothness of the rotational drive of the drive unit 3. Figure 8In the illustrated embodiment, the drive unit further includes a hollow cavity 32. The hollow cavity 32 not only serves to lower the drive unit 3, but also facilitates the discharge of air from the containment space 13 when the assembler assembles the pen 100.

[0058] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A pen, characterized in that, include: The housing includes an upper housing and a lower housing connected along the extension direction of the pen's axis; The upper housing and the lower housing surround the housing portion's receiving space along the axis; The pen refill portion is located on the side of the receiving space near the lower housing; A drive unit is disposed on the side of the receiving space near the upper housing; one end of the drive unit abuts against the pen refill portion; The upper housing is rotatable about the axis, and drives the drive unit to move toward or away from the pen tip; and, The rubber-coated portion is wrapped around the side of the housing portion away from the receiving space; one end of the rubber-coated portion is fixed to the upper housing and the other end is fixed to the lower housing.

2. The pen according to claim 1, characterized in that, The housing portion includes a groove unit disposed on the surface of the housing portion away from the receiving space; the groove unit extends along the extending direction; the groove unit includes a plurality of groove units; the plurality of groove units are evenly distributed around the axis.

3. The pen according to claim 1, characterized in that, The housing portion includes a protruding unit disposed on the end surface in the extending direction; the protruding unit extends perpendicular to the extending direction; the overmolded portion covers the protruding unit.

4. The pen according to claim 1, characterized in that, The coating portion is a silicone coating portion, a thermoplastic elastomer coating portion, a thermoplastic rubber coating portion, or a polyvinyl chloride coating portion.

5. The pen according to claim 1, characterized in that, The wall thickness of the coated portion is greater than or equal to 0.8 mm and less than or equal to 2 mm.

6. The pen according to claim 1, characterized in that, The Shore hardness of the overmolded portion is greater than or equal to 15HA and less than or equal to 90HA.

7. The pen according to claim 1, characterized in that, The coated portion includes a gripping plane; the gripping plane is disposed on the side of the coated portion away from the housing portion; the gripping plane includes multiple gripping planes; the multiple gripping planes are evenly distributed around the axis.

8. The pen according to claim 1, characterized in that, The upper housing has an opening at one end away from the lower housing, which communicates with the receiving space; the coated portion includes a coated opening communicating with the housing opening; the pen further includes: The sealing part extends from the rubber-coated opening to the housing opening and engages with the wall of the upper housing facing the receiving space.

9. The pen according to claim 8, characterized in that, The upper housing also includes a boss unit extending toward the receiving space; the end of the sealing portion away from the rubber-coated opening abuts against the boss unit; wherein the rubber-coated portion is disposed between the upper housing and the sealing portion, and wraps around the periphery of the sealing portion.

10. The pen according to claim 1, characterized in that, The driving part includes a driving protrusion; the upper housing includes a driving groove disposed on one side of the receiving space; one end of the driving protrusion away from the lower housing abuts against the driving groove; when the driving part rotates around the axis, the driving groove drives the driving protrusion to move along the extending direction.

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