Propelling pencil

Abstract

A propelling pencil comprises a pencil holder, a pencil lead outlet mechanism and a pencil lead storage tube, a pencil lead holder is arranged in a pencil point of the pencil holder, and the pencil lead storage tube is axially and movably installed in the pencil holder through a first elastic piece and connected to the top end of the pencil lead outlet mechanism; a propeller is further arranged between the bottom end of the pencil lead outlet mechanism and the pencil lead holder and is axially and movably installed in the pencil holder through a second elastic piece, and the top end of the propeller abuts against the bottom end of the pencil lead outlet mechanism. When the lead storage tube is pressed down, the lead outlet mechanism drives the propeller to clamp the lead to move towards the nib, the lead storage tube is loosened, the first elastic piece drives the lead storage tube and the lead outlet mechanism to reset, and the second elastic piece drives the propeller to reset. The automatic pencil is better in concentricity, more stable in lead discharging and less prone to lead breakage.

Description

Technical Field

[0001] This utility model relates to the field of writing instrument technology, specifically to a mechanical pencil. Background Technology

[0002] Existing mechanical pencils generally consist of a barrel, a lead, and a press mechanism. The lead mechanism includes a lead ejection mechanism and a lead reservoir. Pressing the press mechanism at the end of the barrel causes the lead ejection mechanism to hold the lead in the lead reservoir and extend it out of the pencil tip, making writing very convenient. However, the lead diameter is relatively small, usually 0.5mm or 0.7mm. During writing, if the lead is subjected to excessive pressure (such as writing with too much force), it is very easy for it to break.

[0003] To address the aforementioned technical issues, Chinese utility model patent CN218197661U discloses a mechanical pencil that buffers writing pressure, the structure of which is as follows: Figure 1 As shown, by setting an elastic element 2a at the tail end of the lead feeding mechanism 1a, when the head end of the lead 3a is subjected to pressure, the lead feeding mechanism 1a can drive the lead 3a, the lead storage tube 4a and the lead holder 5a to move adaptively towards the end of the pen, thereby buffering the pressure, protecting the lead 3a, and having a certain effect of preventing lead breakage.

[0004] However, existing mechanical pencils still have the following technical problems: due to the long axial distance between the lead feeding mechanism 1a and the lead retainer 5a, the lead 3a connected within this axial distance cannot be well supported, has poor concentricity, unstable lead feeding, and is still very easy to break. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a mechanical pencil with better concentricity, more stable lead output, and less prone to lead breakage.

[0006] The technical solution of this utility model is: a mechanical pencil, including a pencil barrel, a lead feeding mechanism, and a lead storage tube. A lead retainer is provided inside the pencil tip of the pencil barrel. The lead storage tube is axially movable inside the pencil barrel via a first elastic element and connected to the top of the lead feeding mechanism. A pusher is also provided between the bottom end of the lead feeding mechanism and the lead retainer. The pusher is axially movable inside the pencil barrel via a second elastic element, and its top end abuts against the bottom end of the lead feeding mechanism. When the lead storage tube is pressed, the lead feeding mechanism drives the pusher to clamp the lead and move it towards the pencil tip. When the lead storage tube is released, the first elastic element drives the lead storage tube and the lead feeding mechanism to reset, and the second elastic element drives the pusher to reset.

[0007] With the above structure, this utility model has the following advantages:

[0008] This utility model of mechanical pencil adds a pusher between the bottom of the lead feeding mechanism and the lead holder. When the lead is fed, the pusher can follow the lead feeding mechanism to clamp the lead and move it towards the pencil tip. This allows the lead connected between the bottom of the lead feeding mechanism and the lead holder to receive better support, better concentricity, more stable lead feeding, and less prone to breakage.

[0009] Preferably, the lead feeding mechanism includes a sleeve and a lead tip installed inside the sleeve. One end of the lead tip is a connecting end and the other end is a clamping end. The lead storage tube extends into the sleeve and is connected to the connecting end of the lead tip. When the lead storage tube is pressed, the lead tip moves axially within the sleeve, and the clamping end of the lead tip opens or closes radially. The sleeve is also linked to the lead tip, and the top end of the sleeve is connected to the pen barrel via a third elastic element. When the lead tip of the pen is pressed to overcome the resistance of the lead holder, the lead tip clamps the lead and drives the sleeve and the lead storage tube to retract towards the end of the pen. The third elastic element allows the sleeve to retract with the lead tip, so that when the lead tip of the pen is pressed forcefully, the lead tip, sleeve, and lead storage tube can all be adaptively displaced towards the end of the pen, thereby buffering the pressure, protecting the lead tip, and improving the lead breakage prevention effect.

[0010] Preferably, a first limiting step is provided inside the sleeve and below the core storage tube. The first elastic element is sleeved outside the opening, with one end of the first elastic element abutting against the core storage tube and the other end abutting against the first limiting step. This arrangement facilitates the installation of the first elastic element and has a simple and compact structure.

[0011] Preferably, the pen also includes a limiting seat sandwiched between the sleeve and the lead retainer, with the pusher installed within the limiting seat, and the lead retainer positioned between the limiting seat and the pen tip. This design not only facilitates the installation of the pusher using the limiting seat, but also allows the limiting seat to restrict the axial movement of the lead retainer, ensuring the lead retainer remains in a fixed position and will not fall off, thus guaranteeing the writing stability of the lead.

[0012] Preferably, the clamping end of the flower-shaped part is provided with a clamping piece and a retaining ring sleeved outside the clamping piece. A second limiting step is provided within the limiting seat. The retaining ring is located between the first limiting step and the second limiting step. When the retaining ring moves with the clamping piece to abut against the second limiting step, the clamping piece extends out of the retaining ring and opens radially. When the retaining ring moves with the clamping piece to abut against the first limiting step, the clamping piece retracts from the retaining ring and tightens radially. This design utilizes the cooperation between the retaining ring and the first and second limiting steps to achieve the opening and tightening of the clamping end of the flower-shaped part, thereby clamping or releasing the lead core. The structure is simple and easy to implement. Furthermore, the cooperation between the first limiting step and the retaining ring also achieves a linkage connection between the sleeve and the flower-shaped part, allowing the sleeve to adaptively retract towards the end of the pen as the flower-shaped part moves.

[0013] Preferably, a third limiting step is provided within the limiting seat and below the second limiting step, and a fourth limiting step is provided on the pusher. When the pusher moves downward, the fourth limiting step abuts against the third limiting step. This arrangement uses the third and fourth limiting steps to limit the extreme movement position of the flower, thereby controlling the feed amount of the lead core.

[0014] Preferably, the bottom of the pusher has a first groove, and the bottom of the limiting seat has a second groove. The second elastic element is sleeved on the lead core, with one end of the second elastic element abutting against the first groove and the other end abutting against the second groove. Sleeving the second elastic element on the lead core further supports the lead core, and the arrangement of the first and second grooves also allows the second elastic element to achieve better positioning, thereby making the support of the lead core more stable, improving concentricity, and reducing the likelihood of core breakage.

[0015] Preferably, the pen also includes a nib sleeve fixed inside the pen barrel. The sleeve, the limiting seat, and the lead retainer are installed sequentially from top to bottom inside the nib sleeve. A needle tube is also provided at the bottom of the nib sleeve. The lead in the lead storage tube passes through the opening mechanism, the pusher, the limiting seat, and the lead retainer in sequence before extending out of the needle tube. This arrangement installs the lead storage tube, the lead delivery mechanism, and the pusher inside the nib sleeve, thus facilitating modular production and installation. In addition, the nib sleeve and needle tube are fixed structures, so there is no need to press to extend the nib sleeve, thus eliminating the need for pressing. Furthermore, there is no possibility of the nib sleeve suddenly retracting due to misoperation or excessive force, resulting in a better user experience. Moreover, the fixed nib sleeve and needle tube also ensure the stability of lead delivery, better concentricity, and less likelihood of lead breakage.

[0016] Preferably, the tip sleeve has a positioning notch at its top, and the pen barrel has a positioning rib that mates with the positioning notch. This design facilitates quick and easy positioning of the tip sleeve and the pen barrel, making the installation of the tip sleeve more convenient and accurate.

[0017] Preferably, an annular buffer is provided between the pen tip sleeve and the pen barrel, and an annular groove is provided on the outer wall of the pen tip sleeve for embedding the annular buffer. This arrangement can use the annular buffer to alleviate lateral impact, making writing more stable. Attached image description:

[0018] Figure 1 This is a schematic diagram of the structure of an existing mechanical pencil;

[0019] Figure 2 This is a schematic diagram of the structure of the mechanical pencil of this utility model;

[0020] Figure 3 This is a top view of the mechanical pencil of this invention;

[0021] Figure 4 for Figure 3 A cross-sectional view along the middle AA';

[0022] Figure 5 for Figure 4 A magnified view of a portion of point B in the middle;

[0023] Figure 6 This is an exploded view of the mechanical pencil of this invention;

[0024] In the existing technical diagram: 1a-core feeding mechanism, 2a-elastic element, 3a-lead core, 4a-core storage tube, 5a-lead core retainer;

[0025] In the figures of this utility model: 1-pen barrel, 2-lead feeding mechanism, 3-lead storage tube, 4-lead retainer, 5-first elastic element, 6-propeller, 7-second elastic element, 8-lead core, 9-sleeve, 10-flowering, 11-connecting end, 12-clamping end, 13-third elastic element, 14-first limiting step, 15-limiting seat, 16-clamping piece, 17-retaining ring, 18-second limiting step, 19-third limiting step, 20-fourth limiting step, 21-first groove, 22-second groove, 23-pen tip sleeve, 24-needle tube, 25-positioning notch, 26-positioning rib, 27-annular buffer, 28-annular groove, 29-fifth limiting step, 30-upper pen barrel, 31-lower pen barrel, 32-pressing part. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Example:

[0028] like Figure 2-6As shown, a mechanical pencil includes a barrel 1, a lead feeding mechanism 2, and a lead storage tube 3. A lead retainer 4 is provided inside the tip of the barrel 1. The lead storage tube 3 is axially movable inside the barrel 1 via a first elastic element 5 and connected to the top of the lead feeding mechanism 2. A pusher 6 is also provided between the bottom end of the lead feeding mechanism 2 and the lead retainer 4. The pusher 6 is axially movable inside the barrel 1 via a second elastic element 7, and its top end abuts against the bottom end of the lead feeding mechanism 2. When the lead storage tube 3 is pressed, the lead feeding mechanism 2 drives the pusher 6 to clamp the lead 8 and move it towards the tip. When the lead storage tube 3 is released, the first elastic element 5 drives the lead storage tube 3 and the lead feeding mechanism 2 to reset, and the second elastic element 7 drives the pusher 6 to reset. In this embodiment, "up," "down," "inner," and "outer" are... Figure 4 As the standard.

[0029] In this embodiment, a pusher 6 is added between the bottom end of the lead feeding mechanism 2 and the lead holder 4 of the mechanical pencil. When the lead is fed, the pusher 6 can follow the lead feeding mechanism 2 to clamp the lead 8 and move it towards the pencil tip. This allows the lead 8 connected between the bottom end of the lead feeding mechanism 2 and the lead holder 4 to obtain better support, better concentricity, more stable lead feeding, and less prone to breakage.

[0030] The lead feeding mechanism 2 includes a sleeve 9 and a lead 10 installed inside the sleeve 9. One end of the lead 10 is a connecting end 11 and the other end is a clamping end 12. The lead storage tube 3 extends into the sleeve 9 and is connected to the connecting end 11 of the lead 10. When the lead storage tube 3 is pressed, the lead 10 moves axially within the sleeve 9, and the clamping end 12 of the lead 10 opens or closes radially. The sleeve 9 is also linked to the lead 10. The top end of the sleeve 9 is connected to the pen barrel 1 through a third elastic element 13. When the lead 8 of the pen tip is pressed to overcome the resistance of the lead retainer 4, the lead 10 clamps the lead 8 and drives the sleeve 9 and the lead storage tube 3 to retract towards the end of the pen. The third elastic element 13 allows the sleeve 9 to retract with the lead 10, so that when the lead 8 of the pen tip is pressed forcefully, the lead 10, sleeve 9, and lead storage tube 3 can all be displaced adaptively towards the end of the pen, thereby buffering the pressure, protecting the lead 8, and improving the lead breakage prevention effect.

[0031] Inside the sleeve 9 and below the core storage tube 3, a first limiting step 14 is provided. The first elastic element 5 is sleeved outside the opening 10, with one end of the first elastic element 5 abutting against the core storage tube 3 and the other end abutting against the first limiting step 14. This arrangement facilitates the installation of the first elastic element 5 and has a simple and compact structure.

[0032] It also includes a limiting seat 15 sandwiched between the sleeve 9 and the lead retainer 4, with the pusher 6 installed inside the limiting seat 15, and the lead retainer 4 positioned between the limiting seat 15 and the pen tip. This design not only facilitates the installation of the pusher 6 using the limiting seat 15, but also facilitates the restriction of the axial movement of the lead retainer 4 using the limiting seat 15, thus fixing the position of the lead retainer 4 and preventing it from falling off, thereby ensuring the writing stability of the lead 8.

[0033] The clamping end 12 of the "flowering" pen 10 is equipped with a clamping piece 16 and a retaining ring 17 sleeved on the clamping piece 16. A second limiting step 18 is provided inside the limiting seat 15. The retaining ring 17 is located between the first limiting step 14 and the second limiting step 18. When the retaining ring 17 moves with the clamping piece 16 to abut against the second limiting step 18, the clamping piece 16 extends out of the retaining ring 17 and opens radially. When the retaining ring 17 moves with the clamping piece 16 to abut against the first limiting step 14, the clamping piece 16 retracts into the retaining ring 17 and tightens radially. This design utilizes the cooperation between the retaining ring 17 and the first limiting step 14 and the second limiting step 18 to achieve the opening and tightening of the clamping end 12 of the "flowering" pen 10, thereby clamping or releasing the lead core 8. The structure is simple and easy to implement. Furthermore, the cooperation between the first limiting step 14 and the retaining ring 17 also achieves a linkage connection between the sleeve 9 and the "flowering" pen 10, allowing the sleeve 9 to adaptively retract towards the end of the pen as the "flowering" pen 10 moves.

[0034] A third limiting step 19 is provided within the limiting seat 15 and below the second limiting step 18, and a fourth limiting step 20 is provided on the pusher 6. When the pusher 6 moves downward, the fourth limiting step 20 abuts against the third limiting step 19. This arrangement uses the third limiting step 19 and the fourth limiting step 20 to limit the extreme movement position of the flower 10, thereby controlling the feed amount of the lead core 8.

[0035] The bottom of the pusher 6 is provided with a first groove 21, and the bottom of the limiting seat 15 is provided with a second groove 22. The second elastic member 7 is sleeved on the lead core 8, with one end of the second elastic member 7 abutting against the first groove 21 and the other end abutting against the second groove 22. Sleeving the second elastic member 7 on the lead core 8 can further support the lead core 8, and the arrangement of the first groove 21 and the second groove 22 also allows the second elastic member 7 to achieve better positioning, thereby making the support of the lead core 8 more stable, the concentricity better, and the core less prone to breakage.

[0036] It also includes a pen tip sleeve 23 fixed inside the pen barrel 1. The sleeve 9, the limiting seat 15, and the lead retainer 4 are installed in the pen tip sleeve 23 from top to bottom. The bottom of the pen tip sleeve 23 is also provided with a needle tube 24. The lead 8 in the lead storage tube 3 passes through the opening 10, the pusher 6, the limiting seat 15, and the lead retainer 4 in sequence and then extends out of the needle tube 24. This setting installs the lead storage tube 3, the lead delivery mechanism 2, and the pusher 6 inside the pen tip sleeve 23, which facilitates modular production and installation. In addition, the pen tip sleeve 23 and the needle tube 24 are fixed structures, so there is no need to press to extend the pen tip sleeve 23, thus eliminating the need for pressing. Furthermore, there is no possibility that the pen tip sleeve 23 will suddenly retract due to misoperation or brute force, resulting in a better user experience. In addition, the fixed pen tip sleeve 23 and needle tube 24 also ensure the stability of lead delivery, better concentricity, and less likelihood of lead breakage.

[0037] The tip sleeve 23 has a positioning notch 25 at its top, and the pen barrel 1 has a positioning rib 26 that mates with the positioning notch 25. This design facilitates quick and easy positioning of the tip sleeve 23 and the pen barrel 1, making the installation of the tip sleeve 23 more convenient and accurate.

[0038] An annular buffer 27 is also provided between the nib sleeve 23 and the pen barrel 1. The outer wall of the nib sleeve 23 has an annular groove 28 for embedding the annular buffer 27, such as an annular rubber ring. This design can use the annular buffer 27 to alleviate lateral impact and make writing more stable.

[0039] In this embodiment, the first elastic element 5, the second elastic element 7, and the third elastic element 13 are all springs; the top of the pen tip sleeve 23 is higher than the top of the sleeve 9, and a fifth limiting step 29 is provided inside the pen barrel 1 and above the pen tip sleeve 23; the third elastic element 13 is sleeved outside the core storage tube 3, and one end of the third elastic element 13 is located between the pen tip sleeve 23 and the core storage tube 3 and abuts against the top of the sleeve 9, while the other end of the third elastic element 13 abuts against the fifth limiting step 29; the lead core retainer 4 is a silicone damper; the pen barrel 1 includes an upper pen barrel 30 and a lower pen barrel 31, which are detachably connected by threads to facilitate the installation of internal components; the top of the core storage tube 3 is provided with a snap-action part 32, which extends outside the pen barrel 1 for easy pressing; a lead core channel is formed inside the flower 10, the pusher 6, the limiting seat 15, the lead core retainer 4, and the pen tip sleeve 23, and the pusher 6 and the lead core 8 are in clearance fit.

[0040] The working principle of the mechanical pencil in this embodiment is as follows:

[0041] Press the snap part 32 at the top of the core storage tube 3. The core storage tube 3 drives the opening 10 to move down. The opening 10 drives the pusher 6 to clamp the lead core 8 and move down together. The first elastic element 5 and the second elastic element 7 are compressed. When the retaining ring 17 on the clamping end 12 of the opening 10 moves down to abut against the second limiting step 18, the clamping piece 16 continues to move down, extends out of the retaining ring 17 and opens radially. The clamping piece 16 gradually releases the lead core 8. At the same time, the pusher 6 continues to move down until the fourth limiting step 20 abuts against the third limiting step 19. The pusher 6 and the opening 10 stop moving, and the lead core 8 is fed into the pen tip for a certain length.

[0042] Release the pusher 32, the lead core holder 4 clamps the lead core 8, keeping the lead core 8 in the lead core holder 4 without moving backward. At the same time, the first elastic element 5 drives the core storage tube 3 and the core dispensing mechanism 2 to reset, and the second elastic element 7 drives the pusher 6 to reset. When the retaining ring 17 on the clamping end 12 of the opening 10 moves upward to abut against the first limiting step 14, the clamping piece 16 continues to move upward, retracts the retaining ring 17 and tightens radially. The clamping piece 16 re-clamps the lead core 8, so that the lead core 8 can write stably.

[0043] When the lead core 8 of the pen tip is pressed to overcome the resistance of the lead core holder 4, the opening 10 clamps the lead core 8 and moves it towards the end of the pen. The storage tube 3 connected to the opening 10 moves along with it. At the same time, the retaining ring 17 of the opening 10 presses against the first limiting step 14 of the sleeve 9, so that the sleeve 9 also moves towards the end of the pen along with the opening 10. The third elastic element 13 is compressed.

[0044] During the process of feeding the lead core 8 by pressing the lead storage tube 3, the lead core 8, which is connected between the bottom end of the lead feeding mechanism 2 and the lead core holder 4, is always supported by the pusher 6 and the second elastic element 7, making the lead feeding more stable, the concentricity better, and the lead less likely to break. When the lead core 8 of the pen tip is pressed hard, the opening 10 will clamp the lead core 8 and drive the sleeve 9 and the lead storage tube 3 to move adaptively towards the end of the pen, thereby buffering the pressure, protecting the lead core 8, and making the lead breakage prevention effect better.

Claims

1. A mechanical pencil, comprising a barrel (1), a lead feeding mechanism (2), and a lead storage tube (3), wherein a lead retainer (4) is provided inside the tip of the barrel (1), and the lead storage tube (3) is axially movably mounted inside the barrel (1) via a first elastic element (5) and connected to the top end of the lead feeding mechanism (2); characterized in that: A pusher (6) is provided between the bottom end of the lead feeding mechanism (2) and the lead holder (4). The pusher (6) is axially mounted in the pen barrel (1) through the second elastic element (7) and its top end abuts against the bottom end of the lead feeding mechanism (2). When the lead storage tube (3) is pressed, the lead feeding mechanism (2) drives the pusher (6) to clamp the lead (8) and move it toward the pen tip. When the lead storage tube (3) is released, the first elastic element (5) drives the lead storage tube (3) and the lead feeding mechanism (2) to reset and the second elastic element (7) drives the pusher (6) to reset.

2. A mechanical pencil according to claim 1, characterized in that: The lead feeding mechanism (2) includes a sleeve (9) and a flower (10) installed inside the sleeve (9). One end of the flower (10) is a connecting end (11) and the other end is a clamping end (12). The lead storage tube (3) extends into the sleeve (9) and is connected to the connecting end (11) of the flower (10). When the lead storage tube (3) is pressed, the flower (10) moves axially inside the sleeve (9) and the clamping end (12) of the flower (10) opens or closes radially. The sleeve (9) is also linked to the flower (10). The top end of the sleeve (9) is also connected to the pen barrel (1) through a third elastic element (13). When the lead core (8) of the pen tip is pressed to overcome the resistance of the lead core holder (4), the flower (10) clamps the lead core (8) and drives the sleeve (9) and the lead storage tube (3) to retract towards the end of the pen.

3. A mechanical pencil according to claim 2, characterized in that: A first limiting step (14) is provided inside the sleeve (9) and below the core storage tube (3). The first elastic member (5) is sleeved outside the flower (10), and one end of the first elastic member (5) abuts against the core storage tube (3) while the other end abuts against the first limiting step (14).

4. A mechanical pencil according to claim 3, characterized in that: It also includes a limiting seat (15) sandwiched between the sleeve (9) and the lead core holder (4), the pusher (6) is installed in the limiting seat (15), and the lead core holder (4) is limited between the limiting seat (15) and the pen tip.

5. A mechanical pencil according to claim 4, characterized in that: The clamping end (12) of the flower (10) is provided with a clamping piece (16) and a retaining ring (17) sleeved on the clamping piece (16). The limiting seat (15) is provided with a second limiting step (18). The retaining ring (17) is located between the first limiting step (14) and the second limiting step (18). When the retaining ring (17) moves with the clamping piece (16) to abut against the second limiting step (18), the clamping piece (16) extends out of the retaining ring (17) and opens radially. When the retaining ring (17) moves with the clamping piece (16) to abut against the first limiting step (14), the clamping piece (16) retracts the retaining ring (17) and tightens radially.

6. A mechanical pencil according to claim 5, characterized in that: The limiting seat (15) is located inside and below the second limiting step (18), and a third limiting step (19) is provided. The pusher (6) is provided with a fourth limiting step (20). When the pusher (6) moves downward, the fourth limiting step (20) abuts against the third limiting step (19).

7. A mechanical pencil according to claim 4, characterized in that: The bottom of the propeller (6) is provided with a first groove (21), the bottom of the limiting seat (15) is provided with a second groove (22), the second elastic member (7) is sleeved on the lead core (8), and one end of the second elastic member (7) abuts against the first groove (21) and the other end abuts against the second groove (22).

8. A mechanical pencil according to claim 4, characterized in that: It also includes a pen tip sleeve (23) fixed inside the pen barrel (1). The sleeve (9), the limiting seat (15) and the lead core retainer (4) are installed in the pen tip sleeve (23) from top to bottom. The bottom of the pen tip sleeve (23) is also provided with a needle tube (24). The lead core (8) in the lead storage tube (3) passes through the flower (10), the pusher (6), the limiting seat (15) and the lead core retainer (4) in sequence and extends out of the needle tube (24).

9. A mechanical pencil according to claim 8, characterized in that: The top of the pen tip sleeve (23) is provided with a positioning notch (25), and the pen barrel (1) is provided with a positioning rib (26) that cooperates with the positioning notch (25).

10. A mechanical pencil according to claim 8, characterized in that: An annular buffer (27) is provided between the pen tip sleeve (23) and the pen barrel (1), and an annular groove (28) for embedding the annular buffer (27) is provided on the outer side wall of the pen tip sleeve (23).

Images