A pen cap structure that prevents falling off and a rotary pen

Abstract

The present invention discloses a pen cap structure that prevents detachment and a rotary pen. The pen cap structure includes a pen cap outer shell, a pen cap inner lining, and a first rotating wheel. One end of the pen cap outer shell is open and the other end is closed, and it has a cavity. The pen cap inner lining is axially provided with a through hole. The pen cap inner lining is installed in the cavity of the pen cap outer shell and extends along the axial direction of the pen cap outer shell. One end of the first rotating wheel is located outside the pen cap outer shell and the pen cap inner lining, and the other end passes through the through hole of the pen cap inner lining and extends into the inner cavity of the pen cap outer shell. A second externally protruding thread portion and an annular convex column are provided near the closed end in the cavity of the pen cap outer shell. The annular convex column is fixed on the inner wall of the closed end. The annular space between the second externally protruding thread portion and the annular convex column forms an inverted buckle annular space. The top end of the pen cap inner lining abuts against the annular limiting portion and is fixedly connected. The pen cap outer shell is buckled on the first rotating wheel through the inverted buckle annular space. The present invention avoids the detachment of the pen cap and the need to apply glue at the threaded connection.

Description

Technical Field

[0001] The present invention relates to the technical field of writing pens, and specifically to a pen cap structure and a rotary pen that prevent detachment. Background Art

[0002] The rotary pen drives the pen tip to extend and retract by rotation for writing. Compared with the pressing-type telescopic pen, it has certain advantages. However, the rotary pen also has a deficiency that the pen cap is prone to detachment, giving users a bad experience. In order to prevent the pen cap from detaching, the prior art adopts a combination of rotation and gluing. Specifically, the pen cap and the rotating wheel are threadedly connected through matching threads, and glue is applied at the threaded connection to prevent the pen cap from detaching from the rotating wheel, achieving the effect of preventing the pen cap from detaching. However, in this structural method, on the one hand, during production, since it is necessary to apply glue in the narrow internal space of the pen cap, the process of applying glue is not easy to implement, bringing additional production costs. On the other hand, if the rotating wheel does not rotate to the accurate position, that is, if the rotating wheel has not reached the preset position when rotating, the pen cap will tilt. At this time, if the amount of glue is insufficient or the coating is not uniform enough, the pen cap will still detach during use. If the rotating wheel exceeds the preset position, it will damage relevant parts such as the rotating wheel and cause the function to fail, that is, the function of driving the pen tip to extend and retract by rotation to achieve writing cannot be realized. Therefore, a rotary pen that can prevent the pen cap from detaching, has no need for glue application, and does not need to worry about detachment even if it does not reach or exceeds the preset position is needed. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a pen cap structure and a rotary pen that prevent detachment, which can solve the technical problems described in the background art.

[0004] The technical solution for achieving the purpose of the present invention is as follows: A pen cap structure that prevents detachment, including a pen cap outer shell, a pen cap inner lining, and a first rotating wheel. One end of the pen cap outer shell is open and the other end is closed, and it has a cavity. The pen cap inner lining is axially provided with a through hole. The pen cap inner lining is installed in the cavity of the pen cap outer shell and extends axially along the pen cap outer shell. One end of the first rotating wheel is located outside the pen cap outer shell and the pen cap inner lining, and the other end passes through the through hole of the pen cap inner lining and extends into the inner cavity of the pen cap outer shell.

[0005] In the cavity of the pen cap outer shell, a second externally protruding thread portion and an annular convex column are provided near the closed end. One end of the annular convex column is fixed on the inner wall of the closed end, and the other end extends axially along the pen cap outer shell towards the direction of the first rotating wheel. The second externally protruding thread portion surrounds the inner wall of the pen cap outer shell axially. The second externally protruding thread portion protrudes outward relative to the inner wall, and a circular limiting portion is formed at the lowermost end of the second externally protruding thread portion. The annular space between the second externally protruding thread portion and the annular convex column forms an inverted annular space. The top end of the pen cap inner lining abuts against the circular limiting portion and is fixedly connected.

[0006] On the inner wall of the through hole of the pen cap liner, a first external convex thread portion is provided, and the first external convex thread portion surrounds the inner wall of the through hole along the axial direction of the pen cap liner.

[0007] The first rotating wheel includes a thread portion, a smooth portion, and a rotating wheel rod that are sequentially connected together. The thread portion is provided with a through hole, the thread portion is fixed to the top end of the smooth portion, and the other end of the smooth portion is fixedly connected to the rotating wheel rod, and a step is formed at the joint.

[0008] The thread portion is threadedly connected to the second external convex thread portion of the pen cap housing, and the annular convex column is embedded in the through hole of the thread portion, so that the pen cap liner buckles the pen cap housing onto the first rotating wheel through the buckling annular space. The first external convex thread portion surrounds the smooth portion, the thread portion is located above the first external convex thread portion, and the rotating wheel rod is located below the first external convex thread portion. The step abuts against the lowermost end of the first external convex thread portion.

[0009] Further, the pen cap housing has a cylindrical structure.

[0010] Further, the pen cap liner is welded in the cavity of the pen cap housing.

[0011] Further, the axes of the pen cap liner and the pen cap housing coincide.

[0012] Further, the annular convex column is located at the exact center of the second external convex thread portion, and the axis of the annular convex column coincides with the axis of the second external convex thread portion.

[0013] Further, the length of the annular convex column is less than the length of the second external convex thread portion, so that axially, the lowermost end of the annular convex column is always above the lowermost end of the second external convex thread portion.

[0014] Further, the inside of the annular convex column is hollow, so that the annular convex column can be deformed, and the annular convex column has an upper-wide and lower-narrow structure along the direction away from the closed end of the pen cap housing.

[0015] Further, the top end of the pen cap liner is welded to the annular limiting portion, thereby fixedly connecting the pen cap housing and the pen cap liner together, and the top end of the pen cap liner and the annular limiting portion are connected together by a wire welding method.

[0016] Further, the smooth portion and the rotating wheel rod are each also provided with a through hole, and the three through holes of the thread portion, the smooth portion, and the rotating wheel rod are communicated and their respective axes coincide.

[0017] A rotating pen, including the pen cap structure, further includes a pen clip, a pen barrel, a pen tip, a refill, a return spring and a core-return spring. The pen clip is fixed at the upper end of one side of the pen barrel. The pen cap structure is installed on the pen barrel by being embedded through a pen cap outer shell and a pen cap inner lining at the top end of the pen barrel. The return spring is sleeved on the first runner, and the upper end of the return spring abuts against the lowermost end of the pen cap inner lining. One end of the first runner away from the pen cap inner lining is connected to one end of the second runner. Both the first runner and the second runner are embedded and installed on a guide rail tube. The guide rail tube is arranged axially along the pen barrel in the inner cavity of the pen barrel. The other end of the second runner is connected to the refill. The refill is arranged axially along the pen barrel and is located in the inner cavity of the pen barrel. The core-return spring is sleeved on the outlet end of the refill near the pen tip. The core-return spring is located in the inner cavity of the pen tip. The pen tip is threadedly connected to the pen barrel.

[0018] The beneficial effects of the present invention are as follows: Compared with the traditional pen cap, on the one hand, the present invention adopts the internal and external connection method of the pen cap outer shell and the pen cap inner lining, dividing the traditional single pen cap component into two parts, so as to form an inverted buckle annular space, and the first runner can be buckled on the pen cap by buckling, avoiding the pen cap from falling off. On the other hand, in this process, it also avoids the need to apply glue at the threaded connection in the traditional way. And in this embodiment, it can also be avoided that the pen cap outer shell and the pen cap inner lining are separated from each other through welding, and the runner rod is threadedly connected to the pen cap outer shell, further avoiding the risk of the pen cap falling off. Brief Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the rotating pen;

[0020] Figure 2 It is a schematic cross-sectional view of the rotating pen;

[0021] Figure 3 It is a schematic cross-sectional view of the pen cap structure;

[0022] Figure 4 It is an assembly schematic diagram of the first runner installed on the pen cap inner lining;

[0023] Figure 5 It is an assembly schematic diagram of some components assembled together;

[0024] Figure 6 It is a schematic structural diagram of the first runner;

[0025] Figure 7 It is a schematic structural diagram of the pen cap inner lining;

[0026] Figure 8 It is a schematic structural diagram of the pen cap outer shell;

[0027] Figure 9 It is an exploded schematic diagram of the present invention;

[0028] In the figure, 1 - pen cap outer shell, 2 - clip, 3 - pen barrel, 4 - pen tip, 5 - refill, 6 - pen cap lining, 7 - return spring, 8 - first runner, 81 - threaded part, 82 - smooth part, 83 - step, 84 - runner rod, 9 - second runner, 10 - guide tube, 11 - core return spring, 12 - first external convex thread part, 13 - annular convex column, 14 - second external convex thread part, 15 - inverted buckle annular space. Detailed implementation mode

[0029] The following further describes the present invention in conjunction with the accompanying drawings and specific implementation schemes:

[0030] As Figures 1 to 9 shown, an anti-detachment pen cap structure includes a pen cap outer shell 1, a pen cap lining 6 and a first runner 8. One end of the pen cap outer shell 1 is open and the other end is closed, and it is a cylindrical structure with a cavity. The pen cap lining 6 is provided with a through hole along the axial direction, and the pen cap lining 6 is welded in the cavity of the pen cap outer shell 1, so that it is located in the cavity of the pen cap outer shell 1 and extends along the axial direction of the pen cap outer shell 1, that is, the axes of the pen cap lining 6 and the pen cap outer shell 1 coincide. One end of the first runner 8 is located outside the pen cap outer shell 1 and the pen cap lining 6, and the other end passes through the through hole of the pen cap lining 6 and extends into the inner cavity of the pen cap outer shell 1, and abuts against the inner wall of the closed end of the pen cap outer shell 1.

[0031] A second external convex thread part 14 and an annular convex column 13 are arranged in the cavity of the pen cap outer shell 1 near the closed end. One end of the annular convex column 13 is fixed on the inner wall of the closed end, and the other end extends along the axial direction of the pen cap outer shell 1 towards the direction of the first runner 8. The second external convex thread part 14 is wound around the inner wall of the pen cap outer shell 1 along the axial direction, that is, the second external convex thread part 14 is arranged annularly along the inner wall of the pen cap outer shell 1 along the axial direction. The second external convex thread part 14 protrudes outward relative to the inner wall to form an annular limiting part at the lowermost end of the second external convex thread part 14. The annular convex column 13 is located at the center of the second external convex thread part 14. The axis of the annular convex column 13 coincides with the axis of the second external convex thread part 14. The length of the annular convex column 13 is less than the length of the second external convex thread part 14, that is, axially, the lowermost end of the annular convex column 13 is always above the lowermost end (i.e., the annular limiting part) of the second external convex thread part 14. The inside of the annular convex column 13 is hollow so that the annular convex column 13 has a certain deformation ability. The annular space between the second external convex thread part 14 and the annular convex column 13 forms an inverted buckle annular space 15. The top end of the pen cap lining 6 (i.e., the end close to the closed end of the pen cap outer shell 1) abuts against the annular limiting part and is fixedly connected, so as to fixedly connect the pen cap lining 6 and the pen cap outer shell 1 together.

[0032] A first external convex thread part 12 is arranged on the inner wall of the through hole of the pen cap lining 6. The first external convex thread part 12 is wound around the inner wall of the through hole along the axial direction of the pen cap lining 6.

[0033] In an alternative embodiment, the pen cap has a cylindrical structure.

[0034] In an alternative embodiment, the annular convex column 13 has an upper-wide and lower-narrow structure along the direction away from the closed end of the pen cap housing 1 (i.e., along the axial direction from top to bottom).

[0035] In an alternative embodiment, the top end of the pen cap lining 6 is welded to the annular limiting portion, thereby fixedly connecting the pen cap housing 1 and the pen cap lining 6 together. And the top end of the pen cap lining 6 and the annular limiting portion are connected by wire welding, that is, the top end of the pen cap lining 6 is welded to the annular limiting portion in a way of an annular curve line.

[0036] The first runner 8 includes a threaded portion 81, a smooth portion 82 and a runner rod 84 connected together in sequence, and the threaded portion 81 is provided with a through hole. The threaded portion 81 is fixed at the top end of the smooth portion 82 (i.e., the end of the smooth portion 82 close to the pen cap lining 6). The other end of the smooth portion 82 is fixedly connected to the runner rod 84, and a step 83 is formed at the joint.

[0037] The threaded portion 81 is threadedly connected to the second externally convex threaded portion 14 of the pen cap housing 1, and the annular convex column 13 is embedded in the through hole of the threaded portion 81, so that the pen cap lining 6 buckles the pen cap housing 1 on the first runner 8 through the buckling annular space 15. When the pen cap housing 1 can rotate relative to the first runner 8, the pen cap housing 1 can always be mounted on the first runner 8, thereby preventing the pen cap housing 1 from falling off. Among them, the smooth portion 82 is directly opposite to the first externally convex threaded portion 12 of the pen cap lining 6, that is, the first externally convex threaded portion 12 surrounds the smooth portion 82, and the threaded portion 81 is exactly above the first externally convex threaded portion 12, while the runner rod 84 is below the first externally convex threaded portion 12, and the step 83 abuts against the lowermost end of the first externally convex threaded portion 12.

[0038] During installation, the threaded portion 81 of the first runner 8 is screwed out of the first externally convex threaded portion 12 by rotation and reaches the buckling annular space 15 and is threadedly connected to the second externally convex threaded portion 81. The smooth portion 82 is provided with a through hole, so that the smooth portion 82 has a certain elasticity, and thus can extend into the first externally convex threaded portion 12 under the action of the first externally convex threaded portion 81 and fill the through hole of the pen cap lining 6.

[0039] In an alternative embodiment, the smooth portion 82 and the runner rod 84 are each also provided with a through hole, and the three through holes of the threaded portion 81, the smooth portion 82 and the runner rod 84 are communicated and their axes coincide.

[0040] Compared with the traditional pen cap, the pen cap structure of this embodiment, on the one hand, adopts the internal and external connection method of the pen cap outer shell 1 and the pen cap inner lining 6, dividing the traditional single pen cap part into two, so as to form an inverted buckle annular space 15, and the first runner 8 can be buckled on the pen cap by buckling, avoiding the pen cap from falling off. On the other hand, in this process, it also avoids the need to apply glue at the threaded connection in the traditional way, and this embodiment can also avoid the pen cap outer shell 1 and the pen cap inner lining 6 from separating from each other by welding, and the runner rod 84 is threadedly connected to the pen cap outer shell 1, further avoiding the risk of the pen cap falling off.

[0041] The present invention also provides a rotary pen including the pen cap structure. In addition to the pen cap structure, it further includes a pen clip 2, a pen barrel 3, a pen tip 4, a refill 5, a return spring 7, a guide tube 10 and a core return spring 11. The pen clip 2 is fixed at the upper end of one side of the pen barrel 3. The pen cap structure is installed on the pen barrel 3 by embedding the pen cap outer shell 1 and the pen cap inner lining 6 at the top end of the pen barrel 3. The return spring 7 is sleeved on the first runner 8, and the upper end of the return spring 7 abuts against the lowermost end of the pen cap inner lining 6. One end of the first runner 8 away from the pen cap inner lining 6 is connected to one end of the second runner 9. The first runner 8 and the second runner 9 are both embedded and installed on the guide tube 10. The guide tube 10 is arranged along the axial direction of the pen barrel 3 in the inner cavity of the pen barrel 3. The other end of the second runner 9 is connected to the refill 5. The refill 5 is arranged along the axial direction of the pen barrel 3 and is located in the inner cavity of the pen barrel 3. The core return spring 11 is sleeved on the outlet end of the refill 5 close to the pen tip 4. The core return spring 11 is located in the inner cavity of the pen tip 4. The pen tip 4 is threadedly connected to the pen barrel 3.

[0042] Since driving the first runner 8 to rotate by rotating the pen cap structure and then driving the second runner 9 to drive the telescopic movement, and combining the return spring 7 and the core return spring 11 to realize the telescopic movement of the refill 5 relative to the pen barrel 3 are prior arts and will not be elaborated herein.

[0043] The embodiments disclosed in this specification are only an illustration of the unilateral features of the present invention. The protection scope of the present invention is not limited to this embodiment, and any other functionally equivalent embodiments fall within the protection scope of the present invention. For those skilled in the art, various corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims

1. An anti-detachment pen cap structure, Characterized in that, It includes a pen cap outer shell, a pen cap inner lining and a first rotating wheel. One end of the pen cap outer shell is open and the other end is closed, and it has a cavity. The pen cap inner lining is axially provided with a through hole. The pen cap inner lining is installed in the cavity of the pen cap outer shell and extends along the axis of the pen cap outer shell. One end of the first rotating wheel is located outside the pen cap outer shell and the pen cap inner lining, and the other end passes through the through hole of the pen cap inner lining and extends into the inner cavity of the pen cap outer shell. In the cavity of the pen cap outer shell, a second external convex thread part and an annular convex column are arranged near the closed end. One end of the annular convex column is fixed on the inner wall of the closed end, and the other end extends along the axis of the pen cap outer shell towards the direction of the first rotating wheel. The second external convex thread part surrounds the inner wall of the pen cap outer shell axially. The second external convex thread part protrudes outwards relative to the inner wall and forms an annular limiting part at the lowermost end of the second external convex thread part. The annular space between the second external convex thread part and the annular convex column forms an inverted annular space. The top end of the pen cap inner lining abuts against the annular limiting part and is fixedly connected. On the inner wall of the through hole of the pen cap inner lining, a first external convex thread part is arranged. The first external convex thread part surrounds the inner wall of the through hole along the axis of the pen cap inner lining. The first rotating wheel includes a thread part, a smooth part and a rotating wheel rod connected together in sequence. And the thread part is provided with a through hole. The thread part is fixed at the top end of the smooth part. The other end of the smooth part is fixedly connected with the rotating wheel rod, and a step is formed at the joint. The thread part is threadedly connected with the second external convex thread part of the pen cap outer shell, and the annular convex column is embedded in the through hole of the thread part, so that the pen cap inner lining buckles the pen cap outer shell on the first rotating wheel through the inverted annular space. The first external convex thread part surrounds the smooth part, and the thread part is located above the first external convex thread part, while the rotating wheel rod is located below the first external convex thread part. The step abuts against the lowermost end of the first external convex thread part.

2. The anti-detachment pen cap structure according to claim 1, Characterized in that, The pen cap outer shell is of a cylindrical structure.

3. The anti-detachment pen cap structure according to claim 1, Characterized in that, The pen cap inner lining is welded in the cavity of the pen cap outer shell.

4. The anti-detachment pen cap structure according to claim 1, Characterized in that, The axes of the pen cap inner lining and the pen cap outer shell are kept coincident.

5. The anti-detachment pen cap structure according to claim 1, Characterized in that, The annular convex column is located at the exact center of the second external convex thread part, and the axis of the annular convex column coincides with the axis of the second external convex thread part.

6. The anti-detachment pen cap structure according to claim 1, Characterized in that, The length of the annular convex column is less than the length of the second external convex thread part, so that axially, the lowermost end of the annular convex column is always above the lowermost end of the second external convex thread part.

7. The anti-detachment pen cap structure according to claim 1, Characterized in that, The inside of the annular convex column is hollow, so that the annular convex column can be deformed, and the annular convex column has an upper-wide and lower-narrow structure along the direction away from the closed end of the pen cap outer shell.

8. The anti-detachment pen cap structure according to claim 1, Characterized in that, The top end of the pen cap inner lining is welded to the annular limiting portion, thereby fixedly connecting the pen cap housing and the pen cap inner lining together, and the top end of the pen cap inner lining and the annular limiting portion are connected together by a wire welding method.

9. The anti-detachment pen cap structure according to claim 1, wherein, the smooth portion and the rotating wheel rod are each provided with a through hole, and the three through holes of the threaded portion, the smooth portion and the rotating wheel rod are communicated and their respective axes coincide.

10. A rotary pen, wherein, it includes the anti-detachment pen cap structure according to any one of claims 1-9, and further includes a pen clip, a pen barrel, a pen tip, a pen core, a return spring and a core-return spring. The pen clip is fixed to the upper end of one side of the pen barrel. The pen cap structure is installed on the pen barrel by embedding the pen cap housing and the pen cap inner lining at the top end of the pen barrel. The return spring is sleeved on the first rotating wheel, and the upper end of the return spring abuts against the lowermost end of the pen cap inner lining. One end of the first rotating wheel away from the pen cap inner lining is connected to one end of the second rotating wheel. Both the first rotating wheel and the second rotating wheel are embedded and installed on the guide rail tube. The guide rail tube is arranged along the axial direction of the pen barrel in the inner cavity of the pen barrel. The other end of the second rotating wheel is connected to the pen core. The pen core is arranged along the axial direction of the pen barrel and is located in the inner cavity of the pen barrel. The core-return spring is sleeved on the outlet end of the pen core close to the pen tip. The core-return spring is located in the inner cavity of the pen tip. The pen tip is threadedly connected to the pen barrel.

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