A progressive automatic sketching pencil

Abstract

The utility model discloses a kind of progressive automatic sketch pencils, comprising: hollow pen shell;Progressive sandwich mechanism, it is movably arranged in the pen shell interior;The axial sliding anti-rotation structure is equipped between the pen shell and progressive sandwich mechanism, the axial sliding anti-rotation structure is configured to allow the axial relative movement of both and limit circumferential relative rotation.The utility model provides a kind of progressive automatic sketch pencils, by setting axial sliding anti-rotation structure, ensure that progressive sandwich mechanism and pen shell do not slip between, to improve the cutting efficiency of pencil sharpener, stabilize pencil lead sharpening function, improve the performance stability of automatic sketch pencil when accurate sharpening.

Description

Technical Field

[0001] This utility model relates to the field of mechanical pencil technology, and more specifically, to a progressive automatic sketching pencil. Background Technology

[0002] Pulsating mechanical pencils, also known as snap-action mechanical pencils, are writing instruments that automatically advance the lead by pushing the lead. Compared to traditional wooden pencils, mechanical pencils use finer lead, commonly 0.3mm, 0.4mm, and 0.5mm, while 2.0mm mechanical sketching pencils are also available. Due to their convenience and precision, these pencils have gradually become widely used tools in writing and drawing.

[0003] However, most mechanical pencils experience slippage between the progressive lead clamping mechanism and the pencil case when sharpened with a pencil sharpener or automatic pencil sharpener. Specifically, the lead causes the progressive lead clamping mechanism to rotate relative to the pencil case, resulting in slippage between the mechanism and the case. This slippage prevents the pencil sharpener blade from cutting effectively, resulting in insufficient cutting force and an inability to complete the normal sharpening action. Summary of the Invention

[0004] This utility model aims to solve one of the technical problems in related technologies to a certain extent. To this end, the embodiments of this utility model propose a progressive automatic sketching pencil. By setting an axial sliding anti-rotation structure, it ensures that there is no slippage between the progressive lead clamping mechanism and the pencil shell, thereby improving the cutting efficiency of the pencil sharpener, stabilizing the lead sharpening function, and enhancing the performance stability of the automatic sketching pencil when precisely sharpening.

[0005] The technical solution adopted by this utility model is: to provide a progressive automatic sketching pencil, comprising:

[0006] Hollow pen casing;

[0007] A progressive sandwich mechanism is movably disposed inside the pen casing;

[0008] An axial sliding anti-rotation structure is provided between the pen shell and the progressive clamping mechanism. This axial sliding anti-rotation structure is configured to allow axial relative movement between the two and restrict circumferential relative rotation.

[0009] By adopting the above structure and incorporating an axial sliding anti-rotation mechanism, slippage between the progressive lead clamping mechanism and the pencil case can be effectively prevented. During sharpening, the axial sliding anti-rotation mechanism ensures a relatively fixed rotational relationship between the lead clamping mechanism and the pencil case, allowing the sharpener's blade to cut the lead stably and effectively, preventing insufficient force on the blade, improving sharpening efficiency, and guaranteeing normal sharpening function. This technical solution significantly improves the performance stability of automatic sketching pencils in daily use, especially in situations requiring precise lead sharpening.

[0010] According to one embodiment of the present invention, the axial sliding anti-rotation structure includes at least one of keyway and key fit, non-circular cross section fit, pin groove fit, spline engagement or rolling element guidance; it can effectively limit the circumferential relative rotation between the progressive sandwich mechanism and the pen shell and prevent slippage.

[0011] According to one embodiment of the present invention, the progressive clamping mechanism includes a chuck, a core storage tube, a locking ring, and a spring; forming an integrated structure to ensure stable clamping and automatic advance of the lead core.

[0012] According to one embodiment of the present invention, the axial sliding anti-rotation structure is disposed between the locking ring and the pen shell and / or between the core storage tube and the pen shell to prevent relative rotation and achieve axial sliding.

[0013] According to one embodiment of the present invention, the pen shell has a mating hole that mates with the outer contour of the locking ring. The locking ring mates with the non-circular cross-section of the mating hole to ensure that the locking ring is stably fixed inside the pen shell, thereby causing slippage between the two and preventing relative displacement of the clamping mechanism.

[0014] According to one embodiment of the present invention, at least one protrusion is provided on one of the outer wall of the core storage tube and the inner wall of the pen shell; and at least one groove is provided on the other to cooperate with the protrusion;

[0015] The engagement of the protrusion and the groove allows the core tube to slide axially relative to the pen shell while restricting their relative rotation, thereby achieving stable sliding and anti-rotation functions.

[0016] According to one embodiment of the present invention, the core storage tube is fitted with the non-circular cross-section of the inner hole of the pen shell to ensure that the core storage tube is stably positioned inside the pen shell, prevent relative rotation, and achieve precise axial sliding.

[0017] According to one embodiment of the present invention, the progressive clamping mechanism further includes a pen cap, which blocks the opening of the lead storage tube away from the opening of the opening clamp to prevent the lead core from being exposed.

[0018] According to one embodiment of the present invention, the axial sliding anti-rotation structure is disposed between the pen cap and the pen shell, preferably the pen cap and the pen shell are connected by keyway and key fit, non-circular cross section fit, pin groove fit, spline engagement or rolling element guide connection, so as to effectively prevent the pen cap from slipping relative to the pen shell and ensure its stable connection.

[0019] According to one embodiment of the present invention, the progressive sandwich mechanism further includes an inner sleeve.

[0020] According to one embodiment of the present invention, the flowering clamp and the core storage tube are either an integral structure or separate structures. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a perspective view of the mechanical pencil in an embodiment of this utility model.

[0023] Figure 2 This is a perspective view of the mechanical pencil in an embodiment of this utility model.

[0024] Figure 3 This is a half-sectional view of the mechanical pencil in an embodiment of this utility model.

[0025] Figure 4 This is a perspective view of the progressive sandwich mechanism in an embodiment of this utility model.

[0026] Figure 5 This is an exploded view of the mechanical pencil in an embodiment of this utility model.

[0027] Figure 6 This is a perspective view of the pen tip in an embodiment of this utility model.

[0028] Figure 7 This is a perspective view of the nib tube and pen cap in an embodiment of this utility model.

[0029] Figure 8 This is a perspective view of the locking ring in an embodiment of this utility model.

[0030] Figure 9 This is an exploded view of the flowering clamp and the core storage tube in an embodiment of this utility model.

[0031] Figure 10 This is a perspective view of the flowering clamp and the core storage tube in an embodiment of this utility model.

[0032] Figure 11 This is a perspective view of the pen barrel in an embodiment of this utility model.

[0033] Explanation of the labels in the diagram:

[0034] 10. Pen casing; 20. Progressive clip mechanism; 30. Lead core;

[0035] 11. Pen barrel; 12. Pen nib;

[0036] 11a. Guide groove; 11b. Inner hole;

[0037] 12a. Mating hole;

[0038] 21. Flowering clip; 22. Core storage tube; 23. Locking ring; 24. Spring; 25. Inner sleeve; 26. Pen cap;

[0039] 23a. Inner circle; 23b. Plane;

[0040] 26a. Guiding section. Detailed Implementation

[0041] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. Example 1

[0042] like Figure 1-11 As shown, this embodiment discloses a progressive automatic sketching pencil, comprising:

[0043] Hollow pen casing 10;

[0044] A progressive sandwich mechanism 20 is movably disposed inside the pen housing 10;

[0045] An axial sliding anti-rotation structure is provided between the pen shell 10 and the progressive clamping mechanism 20. This axial sliding anti-rotation structure is configured to allow axial relative movement between the two and restrict circumferential relative rotation.

[0046] Furthermore, in this embodiment, the pen casing 10 includes a pen barrel 11 and a pen tip 12, with the pen barrel 11 and pen tip 12 threadedly connected to form a hollow pen casing 10. A progressive sandwich mechanism 20 is movably installed inside the pen casing 10. Figure 11 As shown, a guide groove 11a is provided on the inner wall of the end of the pen barrel 11 away from the pen tip 12.

[0047] The working principle of the automatic sketching pencil in this embodiment is as follows:

[0048] When the user applies a pressing action (usually by pressing the cap 26 at the end of the pen with a finger), the progressive clamping mechanism 20 is displaced axially downward under external pressure. This movement needs to overcome the preload of the internal spring 24. As the progressive clamping mechanism 20 displaces axially, the lead core 30 inside is conveyed.

[0049] The progressive clamping mechanism 20 mainly consists of a chuck 21, a lead storage tube 22, a locking ring 23, and a spring 24. The chuck 21 is fixedly connected to one end of the lead storage tube 22, and its inner hole 11b communicates with the internal channel of the lead storage tube 22, ensuring the smooth passage of the lead 30. The spring 24 is sleeved on the outer periphery of the chuck 21, providing a restoring force for the entire mechanism. An inner sleeve 25 is provided on the outer periphery of the spring 24, which is tightly embedded in the inner wall of the pen barrel 11 to maintain the axial stability of the mechanism. The locking ring 23 is sleeved on the end of the chuck 21 and is used to clamp the lead 30 during the reset phase.

[0050] As the lead reservoir 22 moves downward, the opening clamp 21 undergoes radial elastic expansion, causing the clamp claws to open and releasing the clamping constraint on the lead 30. At this time, the lead 30 gains free movement space under the action of gravity and begins to slide axially along the guide channel inside the lead protector tube. The lead 30 can only extend a preset constant distance (typically 0.5-1.2mm). This design avoids the risk of breakage caused by excessive extension of the lead 30 and ensures the stability of the writing lines.

[0051] When the external pressure is removed, the system enters the reset phase: spring 24 releases its stored elastic potential energy, pushing the core storage tube 22 to move in the opposite direction to its initial position. During this process, the claws of the opening chuck 21 move upward with the core storage tube 22 and disengage from the conical constraint surface, restoring their closed state through their own elasticity; simultaneously, the locking ring 23 generates radial contraction force through the conical surface engagement, forming a synergistic clamping effect with the opening chuck 21, relocking the lead core 30 in the preset axial position. Thus, the system completes a full "pressure trigger - lead core 30 advance - automatic locking" pulsating core ejection cycle.

[0052] In this embodiment, the lead 30 of the automatic sketching pencil has a diameter of 2.0mm, 2.5mm, 3.2mm, 4.0mm, etc. To ensure the stability of the sketching lead 30 during writing, the chuck 21 usually has a large clamping force to prevent the lead 30 from moving relative to the chuck 21. In the prior art, the mating surface between the chuck 21 and the locking ring 23 lacks effective anti-rotation constraints, causing the lead 30 to drive the chuck 21 to rotate relative to the locking ring 23 during pencil sharpening. At the same time, there is no special anti-slip structure between the lead storage tube 22 and the inner hole 11b of the pencil barrel 11. This structural defect causes the chuck 21 and the locking ring 23 to easily rotate relative to each other during the cutting operation, causing the pencil sharpener and the lead 30 to spin freely, ultimately preventing the lead 30 from being cut smoothly.

[0053] To address the aforementioned technical problems, this embodiment, while retaining the reliable clamping function of the flower-shaped clamp 21 for the lead core 30 in the prior art, specifically provides an axial sliding anti-rotation structure between the inner wall of the pen shell 10 and the outer surface of the progressive clamping mechanism 20. This axial sliding anti-rotation structure adopts any one or more combinations of the following technical solutions:

[0054] 1) Keyway and key mating structure, which achieves anti-rotation by machining matching keyways and keys on mating components;

[0055] 2) Non-circular cross-section mating structure, where the cross-sections of the mating components are designed as polygons or other non-circular geometric shapes;

[0056] 3) The pin-groove mating structure adopts a mating method between the positioning pin and the guide groove 11a;

[0057] 4) Spline meshing structure, which prevents rotation through precision-machined spline teeth;

[0058] 5) Rolling element guiding structure, using ball or roller retainers to achieve precise guidance. The setting of these axial sliding anti-rotation structures not only ensures that the progressive core clamping mechanism 20 can smoothly slide axially within the pen shell 10 to achieve the progressive delivery of the lead core 30, but also effectively prevents unnecessary relative rotation between components during cutting operations, thereby completely solving the cutting idle problem existing in the prior art.

[0059] Furthermore, combining Figure 8As shown, the pen casing 1 has a mating hole 12a that mates with the outer contour of the locking ring 23. The locking ring 23 has a non-circular cross-section that mates with the mating hole 12a. The inner ring 23a of the locking ring 23 is adapted to the outer ring of the head of the opening clip 21. The outer periphery of the locking ring 23 has a flat surface 23b. The pen casing 10 has a mating hole 12a that mates with the outer contour of the locking ring 23, ensuring that the locking ring 23 is stably fixed within the pen casing 10, thereby preventing slippage between the two and preventing relative displacement of the core clamping mechanism. The core storage tube 22 mates with the non-circular cross-section of the inner hole 11b of the pen casing 10. Specifically, the cross-section of the core storage tube 22 is hexagonal, and the core storage tube 22 is a hexagonal prism. The corresponding inner hole 11b of the pen casing 10 is also a hexagonal prism. While the core storage tube 22 moves axially within the inner hole 11b, its circumferential rotation is constrained.

[0060] In some other embodiments, a concave-convex structure is used instead of the non-circular cross-section fit in this embodiment; specifically, the main body of the core tube 22 is cylindrical, and its outer surface is provided with a protrusion. The inner hole 11b of the pen barrel 11 is provided with a long groove. The protrusion slides axially along the groove and restricts the relative rotation between the core tube 22 and the pen barrel 11, thereby achieving a stable sliding and rotation anti-rotation function.

[0061] Specifically, in combination Figure 7 As shown, the progressive clamping mechanism 20 also includes a pen cap 26, which seals the opening of the lead storage tube 22 away from the opening of the chuck 21 to prevent the lead core 30 from being exposed. The pen cap 26 is connected to the pen shell 10 via keyway and key engagement, non-circular cross-section engagement, pin groove engagement, spline engagement, or rolling element guidance, thereby effectively preventing the pen cap 26 from slipping relative to the pen shell 10 and ensuring its stable connection.

[0062] More specifically, in this embodiment, the outer periphery of the pen cap 26 is provided with a guide portion 26a, which has an external spline structure; correspondingly, the inner wall of the inner hole 11b of the pen barrel 11 is provided with a guide groove 11a, which has an internal spline structure. The guide portion 26a slides axially along the guide groove 11a and restricts the relative rotation of the pen cap 26 and the pen barrel 11. The pen cap 26 and the core storage tube 22 adopt a non-circular cross-section mating structure, and the core storage tube 22 is fixedly connected to the flower-shaped clamp 21, thereby making the three integrated as one, ensuring that the overall rotation relative to the pen shell 10 is restricted while moving synchronously axially.

[0063] Combination Figure 9 As shown, in this embodiment, the flowering clamp 21 and the core storage tube 22 are connected by a socket joint, while in other embodiments the flowering clamp 21 and the core storage tube 22 are an integral structure.

[0064] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0065] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0066] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0067] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A progressive automatic sketching pencil, characterized in that, include: Hollow pen casing; A progressive sandwich mechanism is movably disposed inside the pen casing; An axial sliding anti-rotation structure is provided between the pen shell and the progressive clamping mechanism. This axial sliding anti-rotation structure is configured to allow axial relative movement between the two and restrict circumferential relative rotation.

2. The progressive automatic sketching pencil according to claim 1, characterized in that: The axial sliding anti-rotation structure includes at least one of the following: keyway and key fit, non-circular cross section fit, pin groove fit, spline engagement, or rolling element guidance.

3. The progressive automatic sketching pencil according to claim 1, characterized in that: The progressive core clamping mechanism includes a jack, a core storage tube, a locking ring, and a spring.

4. The progressive automatic sketching pencil according to claim 3, characterized in that: The pen shell has a mating hole that mates with the outer contour of the locking ring, and the locking ring mates with the mating hole with a non-circular cross section.

5. A progressive automatic sketching pencil according to claim 3, characterized in that: At least one protrusion is provided on one of the outer wall of the core storage tube and the inner wall of the pen casing; and at least one groove is provided on the other to cooperate with the protrusion; The engagement of the protrusion and the groove is configured to allow the cartridge tube to slide axially relative to the pen casing and restrict their relative rotation.

6. A progressive automatic sketching pencil according to claim 3, characterized in that: The core storage tube is fitted with the non-circular cross-section of the inner hole of the pen casing.

7. A progressive automatic sketching pencil according to claim 3, characterized in that: The progressive clamping mechanism also includes a pen cap that blocks the opening of the core storage tube at the end away from the flowering clamp.

8. A progressive automatic sketching pencil according to claim 7, characterized in that: The axial sliding anti-rotation structure is located between the pen cap and the pen shell.

9. A progressive automatic sketching pencil according to claim 3, characterized in that: The axial sliding anti-rotation structure is disposed between the locking ring and the pen shell and / or between the core tube and the pen shell.

10. A progressive automatic sketching pencil according to claim 3, characterized in that: The flowering clamp and the core storage tube are either an integral structure or separate structures.

Images