Propelling pencil

Abstract

A propelling pencil comprises a pencil holder and a movement. The core comprises an inner tube, a core storage tube and a core feeding mechanism; the inner tube is axially and movably mounted in the penholder through a first elastic piece, a lock catch structure is arranged between the inner tube and the penholder, and a key for triggering the lock catch structure to release is arranged on the outer side of the penholder; the core storage tube is axially and movably mounted in the inner tube through a second elastic piece, and the core feeding mechanism is arranged between the core storage tube and the writing end of the inner tube; when the refill storage tube is pressed to enable the inner tube to be limited in the pen holder through the lock catch structure, the writing end of the inner tube extends out of the pen holder, when the refill storage tube is pressed again, the refill feeding mechanism conveys the pencil lead to the writing end of the inner tube, and when the key is pressed, the inner tube is separated from the pen holder, and the writing end of the inner tube retracts into the pen holder. The propelling pencil is more convenient to use and not prone to malfunction.

Description

Technical Field

[0001] The invention relates to the technical field of writing tools, in particular to a mechanical pencil. Background Art

[0002] A mechanical pencil generally includes a pen holder and a movement disposed in the pen holder, and the movement generally includes a lead storage tube, a lead delivery mechanism, and a tip cover. When writing, the lead delivery mechanism delivers the lead in the lead storage tube, and the exposed lead is prone to breakage or scratches when not in use. Therefore, a mechanical pencil with a retractable movement has emerged, which can retract the entire movement into the pen holder so that the lead is not exposed.

[0003] For example, the Chinese utility model patent with authorization announcement number CN2910612Y discloses a mechanical pencil with a retractable movement. The movement is matched with the deep groove and shallow groove in the neck of the pen holder by installing a push-type ballpoint pen-like push-type core and a rotating wheel on the outside of the movement. When not in use, the movement is completely retracted into the neck of the pen; when in use, only a slightly larger force is needed to press the push head, and the tip sleeve of the writing end of the movement can be extended out of the neck of the pen, and the rotating wheel is limited on the shallow groove to fix the movement; then a light press of the push head can open the core feeding mechanism of the movement to output the lead; after use, only a slightly larger force is needed to press the push head, and the rotating wheel can be limited on the deep groove to make the movement completely retracted into the neck of the pen. When the mechanical pencil is not in use, the movement can be completely retracted into the neck of the pen, so that the lead is not exposed, and it is not easy to break or cause scratches.

[0004] However, the existing automatic pencils still have the following technical problems: the extension and retraction switching of the movement and the output of the lead are both achieved by pressing the push button, but the force of pressing the push button when outputting the lead is relatively light, while the force of pressing the push button when retracting and retracting the movement is relatively large; if the force is not well controlled, for example, when pressing the push button to eject the lead, the force may be too large to cause the entire movement to retract, which undoubtedly increases the difficulty of use and is also prone to malfunction. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a mechanical pencil which is more convenient to use and less prone to malfunction.

[0006] The technical solution of the present invention is: a mechanical pencil, comprising a pen holder and a movement;

[0007] The core comprises an inner tube, a core storage tube and a core feeding mechanism;

[0008] The inner tube is axially movably installed in the pen holder through a first elastic member, a locking structure is provided between the inner tube and the pen holder, and a button for triggering the locking structure to be released is provided on the outer side of the pen holder;

[0009] The core storage tube is axially movably installed in the inner tube through a second elastic member, and the core feeding mechanism is arranged between the core storage tube and the writing end of the inner tube;

[0010] When the core storage tube is pressed so that the inner tube is limited in the pen shaft by the locking structure, the writing end of the inner tube extends out of the pen shaft. When the core storage tube is pressed again, the lead delivery mechanism delivers the lead to the writing end of the inner tube. When the button is pressed, the inner tube is disengaged from the pen shaft and the writing end of the inner tube is retracted into the pen shaft.

[0011] The working principle of automatic pencil of the present invention is as follows:

[0012] Assume that the movement is retracted in the initial state, at this time the inner tube is disengaged from the pen barrel, and the writing end of the inner tube is retracted into the pen barrel; press the core storage tube, because the core storage tube is connected to the inner tube through the second elastic member, the inner tube is driven to move synchronously so that the writing end of the inner tube is extended out of the pen barrel, and the inner tube is limited in the pen barrel by the locking structure; when the movement is extended and fixed, press the core storage tube again, no matter how hard the pressure is pressed, only the lead core in the core storage tube can be transported to the writing end of the inner tube by the core feeding mechanism, but the movement cannot be retracted, and the retraction of the movement can only be achieved by pressing the button on the outside of the pen barrel; press the button, the locking structure is separated, the inner tube is disengaged from the pen barrel, and then the inner tube drives the writing end to retract into the pen barrel under the drive of the first elastic member, and the movement retracts.

[0013] After adopting the above structure, the present invention has the following advantages:

[0014] The automatic pencil of the present invention adds an inner tube outside the core storage tube so that the inner tube serves as a carrier for the extension and retraction of the entire movement, and arranges an independent locking structure and a release structure required for the extension and retraction switching of the movement between the inner tube and the pen holder, so that the lead delivery and the extension and retraction switching of the movement are independently realized; when the movement is retracted, pressing the core storage tube can only realize the switching of the extension and retraction state of the movement, but cannot realize the lead delivery mechanism to the writing end of the inner tube; when the movement is extended, pressing the core storage tube can only realize the lead delivery mechanism to the writing end of the inner tube, but cannot realize the extension and retraction switching of the movement, and the retraction of the movement can only be realized by pressing a button on the side of the pen holder; therefore, when the movement is extended, pressing the core storage tube can only realize the lead delivery, and when the movement is retracted, pressing the core storage tube can only realize the extension and retraction switching of the movement, and the two situations will not exist simultaneously due to different forces of pressing the core storage tube, that is, the extension and retraction switching of the movement and the lead delivery do not depend on the force of pressing the core storage tube, but are realized by two different independent mechanisms, so it is more convenient to use and less prone to malfunction.

[0015] Preferably, the lock structure comprises a buckle fixed inside the pen holder, one of the inner tube and the buckle is provided with a buckle portion and the other is provided with a slot portion. The lock structure is provided in a buckle manner, which has a simple structure and is easy to buckle and release.

[0016] Preferably, the buckle ring is arranged outside the inner tube, and an axial guide structure is provided between the inner tube and the buckle. This arrangement can not only guide the axial movement of the inner tube, but also ensure that the buckle part is reliably inserted into the slot.

[0017] Preferably, a spring sheet is provided on the side of the inner tube, one end of the spring sheet is fixedly connected to the inner tube and the other end is a free end, the buckle is provided on the free end of the spring sheet, and when the buckle is aligned with the slot, the spring sheet drives the buckle to snap into the slot. This arrangement arranges the buckle on the spring sheet, so that the buckle can conveniently use the elastic force of the spring sheet to achieve snapping and disengagement with the slot.

[0018] Preferably, the spring sheet is formed by cutting the side wall of the inner tube. This arrangement makes it easy to form the spring sheet and allows the spring sheet and the inner tube to be integrally formed, so that the combination of the two is more reliable and the structure is more compact.

[0019] Preferably, a trigger portion is provided on the inner side of the button, and the slot portion is a through slot provided on the buckle, and the trigger portion abuts against the buckle portion through the slot portion, and when the button is pressed, the trigger portion pushes against the buckle portion to fall off the slot portion. This arrangement makes it easy to realize the combination of the button and the lock structure, and the force of the button can be directly transmitted to the buckle portion, thereby making it easier to release.

[0020] Preferably, a guide rail is provided on the buckle and above the slot, and when the button is pressed, the buckle is separated from the slot and switches to slide axially in the guide. This arrangement allows the buckle to form an axial sliding fit structure with the guide after it is separated from the slot, thereby further guiding the movement of the inner tube.

[0021] Preferably, a connecting piece is further provided between the buckle and the pen holder, one end of the connecting piece extends above the buckle and a limiting ring is provided at the end, the other end of the connecting piece is a free end, the limiting ring is sleeved between the inner tube and the pen holder and is fixedly connected to the pen holder, an opening for embedding the button is provided on the side wall of the pen holder, the button is installed at the opening and connected to the free end of the connecting piece. This arrangement not only facilitates the use of the connecting piece to install the button, making the button installation structure more compact, but also the limiting ring of the connecting piece is conducive to the limiting of the subsequent buckle.

[0022] Preferably, the inner side of the pen holder is provided with a first limiting step and a first annular protrusion, the first annular protrusion is located below the first limiting step, the outer side of the limiting ring is provided with a second annular protrusion, and when the second annular protrusion of the limiting ring is snapped into the first annular protrusion of the pen holder, the top of the limiting ring just abuts against the first limiting step of the pen holder. This arrangement uses the first limiting step and the first annular protrusion of the pen holder to limit the axial movement of the limiting ring, and the limiting ring and the pen holder are snap-fitted through the first annular protrusion and the second annular protrusion, so installation is more convenient.

[0023] Preferably, a third annular protrusion is further provided on the inner side of the pen holder, and a fourth annular protrusion is further provided on the outer side of the clip. When the fourth annular protrusion of the clip is inserted into the third annular protrusion of the pen holder, the top of the clip just abuts against the bottom of the limiting ring. This arrangement uses the bottom of the limiting ring and the third annular protrusion to limit the axial movement of the clip, and the clip and the pen holder are connected by the third annular protrusion and the fourth annular protrusion, so installation is more convenient.

[0024] Preferably, the core further comprises a tip sleeve, which is detachably connected to the writing end of the inner tube, and the core delivery mechanism is arranged between the core storage tube and the tip sleeve. This arrangement facilitates the disassembly and assembly of the core storage tube and the core delivery mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the automatic pencil of the present invention;

[0026] Figure 2 A top view of the mechanical pencil of the present invention;

[0027] Figure 3 for Figure 2 Sectional view along AA';

[0028] Figure 4 for Figure 3 A partial enlarged schematic diagram of point B in the middle;

[0029] Figure 5 for Figure 3 A partial enlarged schematic diagram of point C in the middle;

[0030] Figure 6 The figure is an exploded schematic diagram of the mechanical pencil of the present invention;

[0031] Figure 7 It mainly shows the schematic diagram of the cooperation between the lock structure and the button of the present invention;

[0032] Figure 8 A schematic diagram mainly showing the lock structure of the present invention;

[0033] In the figure: 1-penholder, 2-movement, 3-inner tube, 4-core storage tube, 5-core feeding mechanism, 6-tip sleeve, 7-first elastic member, 8-locking structure, 9-button, 10-second elastic member, 11-fastener, 12-fastener, 13-slot, 14-first guide groove, 15-guide block, 16-second guide groove, 17-guide rail, 18-spring, 19-trigger, 20-connector, 21-limiter Ring, 22-opening, 23-first limiting step, 24-first annular protrusion, 25-second annular protrusion, 26-third annular protrusion, 27-fourth annular protrusion, 28-press head, 29-core needle tube, 30-upper pen rod, 31-lower pen rod, 32-flowering, 33-retaining ring, 34-second limiting step, 35-third limiting step, 36-fourth limiting step, 37-lead core, 38-third elastic member. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0035] Example:

[0036] like Figure 1-Figure 8 As shown, a mechanical pencil comprises a pen holder 1 and a movement 2;

[0037] The movement 2 includes an inner tube 3, a core storage tube 4 and a core delivery mechanism 5;

[0038] The inner tube 3 is axially movably installed in the pen holder 1 through the first elastic member 7. A locking structure 8 is provided between the inner tube 3 and the pen holder 1. A button 9 for triggering the locking structure 8 to be released is provided on the outer side of the pen holder 1.

[0039] The core storage tube 4 is axially movably installed in the inner tube 3 through the second elastic member 10, and the core feeding mechanism 5 is arranged between the core storage tube 4 and the writing end of the inner tube 3;

[0040] When the core storage tube 4 is pressed so that the inner tube 3 is limited in the pen body 1 by the locking structure 8, the writing end of the inner tube 3 extends out of the pen body 1. When the core storage tube 4 is pressed again, the lead feeding mechanism 5 feeds the lead core 37 to the writing end of the inner tube 3. When the button 9 is pressed, the inner tube 3 is disengaged from the pen body 1 and the writing end of the inner tube 3 is retracted into the pen body 1.

[0041] In this embodiment, the directions of up, down, inside, outside, bottom and top are Figure 3 The core feeding mechanism 5 can adopt the existing technology.

[0042] The mechanical pencil of this embodiment adds an inner tube 3 outside the core storage tube 4 so that the inner tube 3 serves as a carrier for the extension and retraction of the entire movement 2, and an independent locking structure 8 and a release structure required for the extension and retraction switching of the movement 2 are arranged between the inner tube 3 and the pen body 1, so that the delivery of the lead 37 and the extension and retraction switching of the movement 2 can be realized independently; when the movement 2 is retracted, pressing the core storage tube 4 can only realize the switching of the extension and retraction state of the movement 2, and the lead delivery mechanism 5 cannot deliver the lead 37 to the writing end of the inner tube 3; and when the movement 2 is extended, pressing the core storage tube 4 can only realize the delivery mechanism 5 to deliver the lead 37 to the writing end of the inner tube 3. The lead core 37 can be extended and retracted without pressing the key 9 on the side of the pen barrel 1. Therefore, when the movement 2 is extended, pressing the core storage tube 4 can only realize the delivery of the lead core 37, while when the movement 2 is retracted, pressing the core storage tube 4 can only realize the extension and retraction of the movement 2. The two situations will not exist at the same time due to the different forces of pressing the core storage tube 4, that is, the extension and retraction of the movement 2 and the delivery of the lead core 37 do not depend on the force of pressing the core storage tube 4, but are realized by two different independent mechanisms. Therefore, it is more convenient to use and less prone to malfunction.

[0043] The lock structure 8 includes a buckle 11 fixedly mounted on the inner side of the pen barrel 1, one of the inner tube 3 and the buckle 11 is provided with a buckle portion 12 and the other is provided with a slot portion 13; in this embodiment, the buckle portion 12 is provided on the inner tube 3, and the slot portion 13 is provided on the buckle 11. The lock structure 8 is provided in a buckle manner, which has a simple structure and is easy to buckle and release.

[0044] The buckle 11 is disposed outside the inner tube 3, and an axial guide structure is provided between the inner tube 3 and the buckle 11; in this embodiment, the axial guide structure includes a guide block 15 provided outside the inner tube 3 and a first guide groove 14 provided inside the buckle 11. This arrangement can not only guide the axial movement of the inner tube 3, but also ensure that the buckle portion 12 is reliably engaged with the groove portion 13.

[0045] A spring sheet 18 is provided on the side of the inner tube 3, one end of the spring sheet 18 is fixedly connected to the inner tube 3 and the other end is a free end, the buckle 12 is provided on the free end of the spring sheet 18, and when the buckle 12 is aligned with the slot 13, the spring sheet 18 drives the buckle 12 to snap into the slot 13. This arrangement arranges the buckle 12 on the spring sheet 18, so that the buckle 12 can conveniently use the elastic force of the spring sheet 18 to achieve engagement and disengagement with the slot 13.

[0046] The spring piece 18 is formed by cutting the side wall of the inner tube 3. This arrangement makes it easy to form the spring piece 18, and the spring piece 18 and the inner tube 3 are integrally formed, the combination of the two is more reliable, and the structure is also more compact.

[0047] A trigger portion 19 is provided on the inner side of the button 9, and the slot portion 13 is a through slot provided on the buckle 11. The trigger portion 19 abuts against the buckle portion 12 through the slot portion 13. When the button 9 is pressed, the trigger portion 19 pushes the buckle portion 12 to fall off the slot portion 13. This arrangement makes it easy to realize the combination of the button 9 and the lock structure 8, and the force of the button 9 can be directly transmitted to the buckle portion 12, thereby making it easier to release.

[0048] A guide rail 17 is also provided on the buckle 11 and above the slot 13. When the button 9 is pressed, the buckle 12 is separated from the slot 13 and switches to the guide rail 17 for axial sliding. In this embodiment, the slot 13 is a U-shaped groove with an opening facing downward, and the guide rail 17 is a U-shaped groove with an opening facing upward. This arrangement allows the buckle 12 to form an axial sliding matching structure with the guide rail 17 after it is separated from the slot 13, thereby further guiding the movement of the inner tube 3.

[0049] The guide rail portion 17 and the axial guide structure are arranged on both sides of the inner tube 3. This arrangement can guide both sides of the inner tube 3, so that the axial movement of the inner tube 3 is more stable.

[0050] A connecting member 20 is also provided between the buckle 11 and the pen barrel 1. One end of the connecting member 20 extends above the buckle 11 and a limiting ring 21 is provided at the end. The other end of the connecting member 20 is a free end. The limiting ring 21 is sleeved between the inner tube 3 and the pen barrel 1 and is fixedly connected to the pen barrel 1. An opening 22 for embedding the button 9 is provided on the side wall of the pen barrel 1. The button 9 is installed at the opening 22 and connected to the free end of the connecting member 20. In this embodiment, a second guide groove 16 is also provided on the inner side of the limiting ring 21 to cooperate with the axial guidance of the guide block 15 on the outer side of the inner tube 3. The position of the second guide groove 16 corresponds to the position of the first guide groove 14. This arrangement not only facilitates the use of the connecting member 20 to install the button 9, making the installation structure of the button 9 more compact, but also the limiting ring 21 of the connecting member 20 is conducive to the subsequent limiting of the buckle 11.

[0051] The inner side of the pen holder 1 is provided with a first limiting step 23 and a first annular protrusion 24, the first annular protrusion 24 is located below the first limiting step 23, and the outer side of the limiting ring 21 is provided with a second annular protrusion 25, when the second annular protrusion 25 of the limiting ring 21 is inserted into the first annular protrusion 24 of the pen holder 1, the top of the limiting ring 21 just abuts against the first limiting step 23 of the pen holder 1. This arrangement uses the first limiting step 23 and the first annular protrusion 24 of the pen holder 1 to limit the axial movement of the limiting ring 21, and the limiting ring 21 and the pen holder 1 are connected by a snap connection through the first annular protrusion 24 and the second annular protrusion 25, so the installation is more convenient.

[0052] The inner side of the pen barrel 1 is also provided with a third annular protrusion 26, and the outer side of the clip 11 is also provided with a fourth annular protrusion 27. When the fourth annular protrusion 27 of the clip 11 is inserted into the third annular protrusion 26 of the pen barrel 1, the top of the clip 11 just abuts against the bottom of the limiting ring 21. This arrangement uses the bottom of the limiting ring 21 and the third annular protrusion 26 to limit the axial movement of the clip 11, and the clip 11 and the pen barrel 1 are connected by the third annular protrusion 26 and the fourth annular protrusion 27, so the installation is more convenient.

[0053] The core 2 also includes a tip sleeve 6, which is detachably connected to the writing end of the inner tube 3, and the core delivery mechanism 5 is arranged between the core storage tube 4 and the tip sleeve 6. This arrangement facilitates the disassembly and assembly of the core storage tube 4 and the core delivery mechanism 5.

[0054] In this embodiment, a pressing head 28 is provided on the top of the core storage tube 4; a core protection needle tube 29 is provided at the end of the tip sleeve 6, and the tip sleeve 6 is threadedly connected to the inner tube 3; the pen body 1 includes an upper pen body 30 and a lower pen body 31, and the upper pen body 30 is threadedly connected to the lower pen body 31; the core feeding mechanism 5 includes a flower 32 and a retaining ring 33, and the retaining ring 33 is fixed to one end of the inner tube 3 close to the tip sleeve 6, one end of the flower 32 is fixedly connected to the core storage tube 4 and the other end is installed in the retaining ring 33, when the core storage tube 4 is pressed, the flower 32 is retracted and opened or tightened in the retaining ring 33, and the flower 32 is opened to release the lead core 37 and is tightened to clamp the lead core 37; the first elastic member 7 is sleeved outside the inner tube 3 and close to the tip sleeve 6. At one end of the tip sleeve 6, a second limiting step 34 is provided on the outer wall of the inner tube 3, a third limiting step 35 is provided on the inner wall of the pen body 1, and the third limiting step 35 is located below the second limiting step 34. One end of the first elastic member 7 is against the second limiting step 34 and the other end is against the third limiting step 35; the second elastic member 10 is sleeved outside the opening 32, and a fourth limiting step 36 is provided on the inner wall of the inner tube 3 and located below the core storage tube 4, one end of the second elastic member 10 is against the fourth limiting step 36 and the other end is against the bottom end of the core storage tube 4; the top end of the core storage tube 4 extends out of the inner tube 3 and a third elastic member 38 is sleeved on this end.

[0055] The working principle of the present embodiment automatic pencil is as follows:

[0056] Assume that the movement 2 is retracted in the initial state, at this time, the buckle portion 12 of the inner tube 3 is disengaged from the slot portion 13 of the snap member 11, and the tip sleeve 6 at the writing end of the inner tube 3 is retracted into the pen body 1; press the push head 28 above the core storage tube 4, because the core storage tube 4 is connected to the inner tube 3 through the second elastic member 10, the inner tube 3 is driven to move synchronously so that the tip sleeve 6 at the writing end of the inner tube 3 is extended out of the pen body 1, and at the same time, the guide block 15 arranged on the inner tube 3 and the first guide groove 14 and the second guide groove 16 arranged on the snap member 11 and the limiting ring 21 guide the axial movement of the inner tube 3, and guide the buckle portion 12 of the inner tube 3 to be inserted into the slot portion 13 of the snap member 11, at this time, the inner tube 3 is limited in the pen body 1, and the tip sleeve 6 can also be reliably extended out of the pen body 1; when the movement 2 is extended and fixed The first elastic member 7 drives the buckle 12 to switch to the guide rail portion 17 and slide axially in the guide rail portion 17. At the same time, the tip sleeve 6 at the writing end of the inner tube 3 is retracted into the pen holder 1, and the movement 2 is retracted.

Claims

1. A mechanical pencil, comprising a pen holder (1) and a movement (2); characterized in that: The core (2) comprises an inner tube (3), a core storage tube (4) and a core feeding mechanism (5); The inner tube (3) is axially movably installed in the pen holder (1) via a first elastic member (7); a locking structure (8) is provided between the inner tube (3) and the pen holder (1); and a button (9) for triggering the locking structure (8) to be released is provided on the outer side of the pen holder (1); The core storage tube (4) is axially movably installed in the inner tube (3) via a second elastic member (10), and the core delivery mechanism (5) is arranged between the core storage tube (4) and the writing end of the inner tube (3); When the core storage tube (4) is pressed to limit the inner tube (3) in the pen shaft (1) through the locking structure (8), the writing end of the inner tube (3) extends out of the pen shaft (1); when the core storage tube (4) is pressed again, the lead delivery mechanism (5) delivers the lead (37) to the writing end of the inner tube (3); when the button (9) is pressed, the inner tube (3) is disengaged from the pen shaft (1) and the writing end of the inner tube (3) is retracted into the pen shaft (1).

2. A mechanical pencil according to claim 1, characterized in that: The locking structure (8) comprises a locking member (11) fixedly arranged on the inner side of the pen holder (1); one of the inner tube (3) and the locking member (11) is provided with a locking portion (12) and the other is provided with a locking groove portion (13).

3. A mechanical pencil according to claim 2, characterized in that: The buckle piece (11) is arranged outside the inner tube (3), and an axial guide structure is also provided between the inner tube (3) and the buckle piece (11).

4. A mechanical pencil according to claim 2, characterized in that: A spring sheet (18) is provided on the side of the inner tube (3), one end of the spring sheet (18) is fixedly connected to the inner tube (3) and the other end is a free end, the buckle portion (12) is provided on the free end of the spring sheet (18), and when the buckle portion (12) is aligned with the slot portion (13), the spring sheet (18) drives the buckle portion (12) to be snapped into the slot portion (13).

5. A mechanical pencil according to claim 4, characterized in that: The spring sheet (18) is formed by cutting the side wall of the inner tube (3).

6. A mechanical pencil according to claim 2, characterized in that: A trigger portion (19) is provided on the inner side of the button (9); the slot portion (13) is a through slot provided on the buckle (11); the trigger portion (19) abuts against the buckle portion (12) through the slot portion (13); when the button (9) is pressed, the trigger portion (19) pushes against the buckle portion (12) to fall off the slot portion (13).

7. A mechanical pencil according to claim 6, characterized in that: A guide rail portion (17) is also provided on the buckle (11) and above the slot portion (13); when the button (9) is pressed, the buckle portion (12) is disengaged from the slot portion (13) and switches to slide axially in the guide rail portion (17).

8. The mechanical pencil according to claim 2, characterized in that: A connecting piece (20) is also provided between the snap-fit ​​piece (11) and the pen shaft (1), one end of the connecting piece (20) extends above the snap-fit ​​piece (11) and a limiting ring (21) is provided at the end, the other end of the connecting piece (20) is a free end, the limiting ring (21) is sleeved between the inner tube (3) and the pen shaft (1) and is fixedly connected to the pen shaft (1), an opening (22) for embedding the button (9) is provided on the side wall of the pen shaft (1), the button (9) is installed at the opening (22) and is connected to the free end of the connecting piece (20).

9. A mechanical pencil according to claim 8, characterized in that: The inner side of the pen shaft (1) is provided with a first limiting step (23) and a first annular protrusion (24), the first annular protrusion (24) is located below the first limiting step (23), and the outer side of the limiting ring (21) is provided with a second annular protrusion (25), when the second annular protrusion (25) of the limiting ring (21) is inserted into the first annular protrusion (24) of the pen shaft (1), the top of the limiting ring (21) just abuts against the first limiting step (23) of the pen shaft (1).

10. A mechanical pencil according to claim 9, characterized in that: A third annular protrusion (26) is also provided on the inner side of the pen shaft (1), and a fourth annular protrusion (27) is also provided on the outer side of the snap member (11). When the fourth annular protrusion (27) of the snap member (11) is inserted into the third annular protrusion (26) of the pen shaft (1), the top of the snap member (11) just abuts against the bottom of the limiting ring (21).

11. The mechanical pencil according to claim 1, characterized in that: The core (2) further comprises a tip sleeve (6), wherein the tip sleeve (6) is detachably connected to the writing end of the inner tube (3), and the core feeding mechanism (5) is arranged between the core storage tube (4) and the tip sleeve (6).

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