Propelling pencil

Abstract

The utility model relates to a propelling pencil which comprises a pencil lead, a pencil point, a front pencil holder, a rear pencil holder and a pencil lead pushing device. An annular limiting block, an axial limiting block and a concave limiting groove for fixing the axial relative position of the front pen holder are arranged on the inner wall of the front pen holder; the pencil lead pushing device comprises a threaded column and a pushing head arranged at the front end of the threaded column and used for pushing the pencil lead to move axially. The pushing head comprises a first cylinder and a second cylinder which are fixedly connected into a whole, one end of the first cylinder faces the pencil lead, the other end of the first cylinder is fixed to the second cylinder, one end of the second cylinder faces the threaded column, and the other end of the second cylinder is fixed to the first cylinder. A groove is formed in the circular periphery of the second cylinder, and the second cylinder moves in the length direction of the axial limiting block through the groove; a hole is formed in the center of the end, facing the threaded column, of the second cylinder. According to the utility model, when the lead core is broken, the displacement of the lead core is reduced, and the broken rear part of the lead core is prevented from being smoothly pushed out of the nib.

Description

Technical Field

[0001] The utility model relates to an automatic pencil and belongs to the technical field of pen making. Background Art

[0002] Mechanical pencils refer to pencils that can release the lead by dropping, rotating, pulsating or automatically compensating. After the tip of a wooden or paper pencil is completely consumed, it can only be used again by sharpening the wooden or paper pen holder. Often, due to improper operation, too much of the pen holder is sharpened, resulting in the tip being too long, or the lead is accidentally sharpened, which not only wastes the lead, but also affects the work efficiency.

[0003] The Chinese utility model with patent announcement number CN212796333U and announcement date 2021.03.26 discloses a mechanical pencil that can improve the utilization rate of the lead core. By rotating the rear pen shaft, the threaded column drives the push head to move axially, thereby achieving the effect of extending the axial movement of the lead core. However, as the threaded column rotates further forward, it will shake and become unstable, driving the push head to be unstable. This will affect the smooth push of the broken rear part of the lead core out of the pen tip, affecting the utilization rate of the lead core. Utility Model Content

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a mechanical pencil with a simple structure, convenient use and a spiral rod that rotates forward to push the lead more stably.

[0005] In order to achieve the above utility model purpose, the technical solution adopted by the utility model is as follows:

[0006] A mechanical pencil comprises a lead core, a pen tip annularly fixing the lead core, a front pen holder screwed to the pen tip, a rear pen holder clamped to the front pen holder, and a lead core pushing device arranged inside the front pen holder and the rear pen holder;

[0007] The inner wall of the front pen holder is provided with an annular limit block, an axial limit block, and a concave limit groove for fixing the axial relative position of the front pen holder;

[0008] The outer wall of the rear pen holder is provided with a raised stopper for fixing the axial relative position of the front pen holder and the rear pen holder;

[0009] The lead core pushing device includes a threaded column, a pushing head arranged at the front end of the threaded column for pushing the lead core to move axially, a nut screwed on the threaded column and driven by the threaded column to rotate circumferentially, and a slider arranged at the rear end of the threaded column for driving the threaded column to rotate circumferentially; the circumferential limit block on the inner wall of the front pen barrel can clamp the nut to prevent it from rotating circumferentially;

[0010] Features:

[0011] The push head comprises a first cylinder and a second cylinder which are fixedly connected as one body, one end of the first cylinder faces the lead core and the other end is fixed to the second cylinder, one end of the second cylinder faces the threaded column and the other end is fixed to the first cylinder;

[0012] The diameter of the second cylinder is larger than that of the first cylinder, and the circular outer circumference of the second cylinder is provided with a plurality of grooves distributed along the length direction of the second cylinder and matched with the axial limit block, and the second cylinder moves along the length direction of the axial limit block through the grooves;

[0013] A hole is arranged at the center of one end of the second cylinder facing the threaded column, the front end of the threaded column is placed in the hole, and the threaded column can rotate in the hole.

[0014] The diameter of the first cylinder is the same as the diameter of the lead core.

[0015] The number of the grooves is 4.

[0016] The front pen holder is transparent.

[0017] The pen tip is also provided with a lead core sandwich rubber sleeve which increases the axial friction force of the lead core.

[0018] The inner wall of the rear pen shaft is provided with a snap-fit ​​strip, which can fix the circumferential relative position of the slider and the rear pen shaft, and can drive the slider to rotate in the same direction when the rear pen shaft is rotated.

[0019] The push head and the slider can limit the nut to rotate axially only on the threaded column.

[0020] The circumferential cross-section of the lead core and the pen tip is a chamfered arc square, and the distance between two opposite chamfers is 2.5-10 mm.

[0021] The utility model has a reasonable and simple structure, is easy to manufacture and manufacture, and is convenient to use. Through the utility model, the rear pen holder is rotated to drive the push head to move axially, thereby achieving the effect of pushing the lead core to move axially and extend the movement.

[0022] The push head is designed to include a first cylinder and a second cylinder which are fixedly connected as one body, one end of the first cylinder faces the lead core and the other end is fixed to the second cylinder, one end of the second cylinder faces the threaded column and the other end is fixed to the first cylinder. The diameter of the second cylinder is larger than that of the first cylinder, and a groove is arranged on the circular outer circumference of the second cylinder, and the second cylinder moves along the length direction of the axial limit block through the groove; an eyelet is arranged at the center of one end of the second cylinder facing the threaded column, and the front end of the threaded column is placed in the eyelet, and the threaded column can rotate in the eyelet.

[0023] When in use, the groove on the second cylinder follows the axial limit block on the inner wall of the upper front pen barrel for positioning, and the second cylinder can slide forward and backward along the axial limit block. With this design, when the lead core breaks, the lead core is less likely to be usurped, avoiding affecting the smooth pushing of the broken rear part of the lead core out of the pen tip, making the spiral rod rotate forward to push the lead core more stably.

[0024] In the utility model, the front pen holder is designed to be transparent, so that the user can see how much lead is left when using it. A lead core rubber sleeve is also provided on the pen tip to increase the axial friction of the lead. A snap-fit ​​strip is provided on the inner wall of the rear pen holder, and the circumferential relative position of the slider and the rear pen holder is conveniently fixed by the snap-fit ​​strip. When the rear pen holder is rotated, the slider can be driven to rotate in the same direction.

[0025] The utility model makes it more stable for the spiral rod to rotate forward to push the lead core. When the lead core is broken, the lead core is less likely to be displaced, thus avoiding affecting the broken rear part of the lead core to be smoothly pushed out of the pen tip, thereby having great market application and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The utility model is a schematic diagram of the structure of the automatic pencil.

[0027] Figure 2 It is a structural schematic diagram of the pen tip in the utility model.

[0028] Figure 3 It is a schematic structural diagram of the front pen holder in the utility model.

[0029] Figure 4 It is a structural schematic diagram of the rear pen holder in the utility model.

[0030] Figure 5 It is a structural schematic diagram of the lead core pushing device in the utility model.

[0031] In the figure: 101 lead, 102 pen tip, 103 lead core sandwich rubber sleeve, 201 front pen body, 202 annular limit block, 203 axial limit block, 204 recessed limit groove, 301 rear pen body, 302 raised limit block, 303 engaging strip, 4 lead core pushing device, 401 threaded column, 402 pushing head, 401-1 first cylinder, 402-2 second cylinder, 402-3 groove, 402-4 eyelet, 403 nut, 404 slider. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0033] A mechanical pencil comprises a lead 101, a nib 102 circumferentially fixing the lead 101, a front pen holder 201 screwed to the nib 102, a rear pen holder 301 clamped to the front pen holder 201, and a lead pushing device 4 arranged inside the front pen holder 201 and the rear pen holder 301. An circumferential limiting block 202, an axial limiting block 203, and a concave limiting groove 204 for fixing the axial relative position of the front pen holder 201 are arranged on the inner wall of the front pen holder 201; a protruding limiting block 302 for fixing the axial relative position of the front pen holder 201 and the rear pen holder 301 is arranged on the outer wall of the rear pen holder 301.

[0034] The lead pushing device 4 includes a threaded column 401, a pushing head 402 arranged at the front end of the threaded column 401 for pushing the lead 101 to move axially, a nut 403 screwed on the threaded column 401 and driven by the threaded column to rotate circumferentially, and a slider 404 arranged at the rear end of the threaded column 401 for driving the threaded column to rotate circumferentially; the circumferential limit block 202 on the inner wall of the front pen shaft 201 can clamp the nut 403 to prevent its circumferential rotation.

[0035] The push head 402 includes a first cylinder 402-1 and a second cylinder 402-2 fixedly connected together. One end of the first cylinder 402-1 faces the lead core 101, and the other end is fixed to the second cylinder 402-2. One end of the second cylinder 402-2 faces the threaded column 401, and the other end is fixed to the first cylinder 402-1.

[0036] Among them, the diameter of the second cylinder 402-2 is larger than that of the first cylinder 402-1, and the circular outer circumference of the second cylinder 402-2 is provided with a plurality of grooves 402-3 distributed along the length direction of the second cylinder 402-2 and cooperating with the axial limit block 203, and the second cylinder 402-2 moves along the length direction of the axial limit block 203 through the grooves 402-3; a hole 402-4 is provided at the center of one end of the second cylinder 402-2 facing the threaded column 401, and the front end of the threaded column 401 is placed in the hole 402-4, and the threaded column 401 can rotate in the hole 402-4.

[0037] Furthermore, the diameter of the first cylinder 402-1 is the same as the diameter of the lead core 101. The number of the grooves 402-3 is designed to be 4. The front pen barrel 201 is transparent.

[0038] At the same time, a lead core rubber sleeve 103 is provided on the pen tip 102 to increase the axial friction of the lead core 101 .

[0039] A snap-fitting strip 303 is disposed on the inner wall of the rear pen barrel 301 , and the snap-fitting strip 303 can fix the circumferential relative position of the slider 404 and the rear pen barrel 301 , and when the rear pen barrel 301 is rotated, the slider 404 can be driven to rotate in the same direction.

[0040] The nut 403 can be limited to rotate axially on the threaded column 401 by the push head 402 and the slider 404. The circumferential cross-section of the lead core 101 and the pen tip 102 is a chamfered arc square, and the distance between two opposite chamfers is 2.5-10mm.

Claims

1. A mechanical pencil, comprising a lead (101), a pen tip (102) annularly fixing the lead (101), a front pen shaft (201) screwed to the pen tip (102), a rear pen shaft (301) clamped to the front pen shaft (201), and a lead pushing device (4) arranged inside the front pen shaft (201) and the rear pen shaft (301); The inner wall of the front pen shaft (201) is provided with an annular limit block (202), an axial limit block (203), and a recessed limit groove (204) for fixing the axial relative position of the front pen shaft (201); The outer wall of the rear pen shaft (301) is provided with a raised limiting block (302) for fixing the axial relative position of the front pen shaft (201) and the rear pen shaft (301); The lead pushing device (4) comprises a threaded column (401), a pushing head (402) arranged at the front end of the threaded column (401) for pushing the lead (101) to move axially, a nut (403) screwed on the threaded column (401) and driven by the threaded column to rotate circumferentially, and a slider (404) arranged at the rear end of the threaded column (401) for driving the threaded column to rotate circumferentially; the circumferential limiting block (202) on the inner wall of the front pen shaft (201) can clamp the nut (403) to prevent it from rotating circumferentially; Features: The push head (402) comprises a first cylinder (402-1) and a second cylinder (402-2) which are fixedly connected as one body, one end of the first cylinder (402-1) faces the lead core (101) and the other end is fixed to the second cylinder (402-2), one end of the second cylinder (402-2) faces the threaded column (401) and the other end is fixed to the first cylinder (402-1); The diameter of the second cylinder (402-2) is greater than that of the first cylinder (402-1), and a plurality of grooves (402-3) distributed along the length direction of the second cylinder (402-2) and cooperating with the axial limit block (203) are provided on the circular outer periphery of the second cylinder (402-2), and the grooves (402-3) are distributed along the length direction of the second cylinder (402-2), and the second cylinder (402-2) moves along the length direction of the axial limit block (203) through the grooves (402-3); An eyelet (402-4) is provided at the centre of one end of the second cylindrical body (402-2) facing the threaded column (401), the front end of the threaded column (401) is placed in the eyelet (402-4), and the threaded column (401) is rotatable in the eyelet (402-4).

2. A mechanical pencil according to claim 1, characterized in that: The diameter of the first cylinder (402-1) is the same as the diameter of the lead core (101).

3. A mechanical pencil according to claim 1, characterized in that: The number of the grooves (402-3) is 4.

4. A mechanical pencil according to claim 1, characterized in that: The front pen holder (201) is transparent.

5. A mechanical pencil according to claim 1, characterized in that: The pen tip (102) is also provided with a lead core rubber sleeve (103) for increasing the axial friction force of the lead core (101).

6. A mechanical pencil according to claim 1, characterized in that: The inner wall of the rear pen shaft (301) is provided with a snap-fit ​​strip (303), which can fix the circumferential relative position of the slider (404) and the rear pen shaft (301), and can drive the slider (404) to rotate in the same direction when the rear pen shaft (301) is rotated.

7. A mechanical pencil according to claim 1, characterized in that: The push head (402) and the slider (404) can limit the nut (403) to only rotate axially on the threaded column (401).

8. The mechanical pencil according to claim 1, characterized in that: The circumferential cross-section of the lead core (101) and the pen tip (102) is a chamfered arc square, and the distance between two opposite chamfers is 2.5-10 mm.

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