An ultra-short automatic pencil for traveling

Abstract

The present invention discloses an ultra-short mechanical pencil for travel, comprising an upper penholder, a lower penholder, a bolt cylinder, a bolt wrench, a spring, and a mechanical pencil core. The present invention utilizes a multi-purpose mechanical pencil core, approximately 6 centimeters in length, housed in a specially designed bolt penholder. This reduces the overall length of the pencil to less than 9 centimeters. The mechanical pencil core can be pressed to release the lead for use and then retracted into the penholder after use. Furthermore, the pencil core also features an anti-accidental contact feature to prevent the tip of the lead from poking through pockets or piercing people, potentially causing injury.

Description

Technical Field

[0001] The invention belongs to the field of stationery, in particular to an ultra-short automatic pencil for traveling. Background Art

[0002] Conventional mechanical pencils are relatively long, measuring approximately 13 to 15 centimeters. They cannot be placed horizontally in smaller pockets, especially in summer, when T-shirts and other tops lack pockets, making them difficult to carry. To address this, shorter portable mechanical pencils have emerged on the market. However, the release button for these portable pencils is often located at the top, making it easy to accidentally touch the release button when carrying them in a pocket, causing the tip to protrude and stain clothing or even injure someone, posing a potential safety hazard. This creates inconvenience for those who enjoy sketching, recording important events, thoughts, inspirations, and data while on the go, and can even affect their work and studies. Summary of the Invention

[0003] In response to the above problems, the present invention aims to provide an ultra-short mechanical pencil for travel, which can be controlled to a length of less than 9 cm. The mechanical pencil can be pressed to release the lead for use, and the lead can be completely retracted into the pen holder after use. The pencil also has an anti-accidental touch function, which can prevent the tip of the pencil from piercing a pocket or piercing a person due to collision, causing accidental injury.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions:

[0005] The outer side of the lower end of the lower pen barrel is hemispherical; the upper pen barrel and the lower pen barrel are threaded together, and the overall length after connection is less than 9 cm. The bolt comprises a bolt cylinder and a bolt wrench, wherein the bolt cylinder has a through hole formed along its axis, and a screw hole perpendicular to the through hole is formed in the middle and upper part of the bolt cylinder; the bolt wrench is composed of a sphere connected to a cylinder, the surface of the cylinder is provided with threads matching the screw hole, and the middle part of the cylinder is provided with a lead insertion hole; the bolt cylinder is installed in the upper pen cavity, and the cylinder of the bolt wrench passes through the notch and is screwed into the screw hole of the bolt cylinder. By turning the bolt wrench along the notch, the bolt cylinder is driven to move in the upper pen cavity; the spring is arranged in the upper pen cavity, the upper end of the spring abuts the bottom end of the bolt cylinder, and the lower end of the spring abuts the top end of the lower half of the pen body; the upper part of the automatic pencil core passes through the spring and is inserted upward into the through hole of the bolt cylinder, and is fixed in the through hole by utilizing the metal elasticity and interference fit of the automatic pencil core; the lower part of the automatic pencil core is located in the lower pen cavity, and the automatic pencil core is also provided with a lead discharge spring.

[0006] The length of the inner core of the automatic pencil is 59.5-60.1 mm.

[0007] The length of the upper half of the pen barrel is 53~56 mm, and the outer diameter is 10 mm; the upper diameter of the upper pen chamber is 8 mm, the length is 3 mm, the middle diameter is 7 mm, the length is 40~43 mm, the lower diameter is 7 mm, the length is 10 mm, and it has an internal thread; the length of the lower half of the pen barrel is 38~41 mm, the outer diameter of the middle part is 10 mm, the outer diameter of the upper part is reduced to 7 mm and has an external thread with a length of 10 mm, the diameter of the lower pen chamber is 3.2 mm, the diameter of the pen tip outlet is 1.4 mm, and the length is 0.5 mm.

[0008] The outer diameter of the bolt cylinder is 6.8 mm and the length is 12 mm. The diameter of the through hole is 2.69-2.71 mm. The diameter of the screw hole is 3 mm. The depth of the screw hole is 4.1-4.4 mm. The distance between the screw hole and the top of the bolt cylinder is 3.7-4.3 mm.

[0009] The diameter of the sphere is 4.5-6 mm, the diameter of the cylinder is 3 mm, the length is 7-8 mm, and the diameter of the lead hole is 1.4 mm.

[0010] The spring has a diameter of 3.5 to 3.9 mm and a length of 18 to 22 mm.

[0011] The width of the left longitudinal rectangle, the left transverse rectangle, the middle longitudinal rectangle, the right transverse rectangle and the right longitudinal rectangle are all 3.2 mm, and the lengths are 5 mm, 4 mm, 10 mm, 4 mm and 8 mm respectively.

[0012] The distance between the upper side of the left longitudinal rectangle and the lower end of the lower half of the pen barrel is 62.2~62.8 mm.

[0013] A cylindrical eraser is plugged on the top of the upper pen cavity.

[0014] The surface of the sphere is provided with a linear shallow groove which is parallel to the lead inlet hole.

[0015] In summary, the present invention has the following beneficial effects: The ultra-short mechanical pencil for travel utilizes a mechanical pencil lead, approximately 6 cm in length, housed within a specially designed bolt and barrel, reducing the total length of the pencil to under 9 cm. The notch design on the upper barrel, combined with the bolt's structure and the upper and lower chambers, allows the mechanical pencil to be pressed to release the lead during use and then retracted into the barrel after use. This prevents the lead tip from piercing pockets or poking someone, causing accidental injury, and prevents the lead from retracting into the barrel due to slipping during use. The hemispherical lower end of the barrel prevents the sharp-angled conical tip from piercing pockets, and the bolt prevents cylindrical pens from rolling and falling onto a tabletop. The present invention offers advantages such as novelty, ease of use, and portability, making it highly marketable.

[0016] Furthermore, the ultra-short mechanical pencil for travel of the present invention can be made of all metals, such as stainless steel, titanium alloy, zirconium alloy, brass, copper, nickel silver, bronze, 925 silver and other metals or precious metals, which increases the playability and fun of the mechanical pencil, and can especially meet the diverse needs of niche or high-end mechanical pencil enthusiasts. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0018] In the attached figure:

[0019] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 Schematic diagrams of the notch in the upper half of the penholder according to the present invention are laid out flatly, wherein (A) shows the complete notch shape, and (B) shows the notch divided into five rectangles by dotted lines to clearly illustrate the notch shape;

[0021] Figure 3 It is a schematic diagram of the various parts of the present invention, wherein the bolt cylinder and the upper half of the pen barrel are cross-sectional views.

[0022] In the figure, 1 is the upper half of the pen barrel, 11 is the upper pen chamber, 2 is the bolt cylinder, 21 is the through hole, 22 is the screw hole, 3 is the lower half of the pen barrel, 31 is the lower pen chamber, 32 is the nib outlet, 4 is the bolt wrench, 41 is the sphere, 42 is the cylinder, 43 is the lead inlet hole, 5 is the spring, 6 is the inner core of the automatic pencil, 61 is the lead outlet spring, 7 is the notch, 71 is the left longitudinal rectangle, 72 is the left transverse rectangle, 73 is the middle longitudinal rectangle, 74 is the right transverse rectangle, and 75 is the right longitudinal rectangle. DETAILED DESCRIPTION

[0023] The above and other technical contents, features and effects of the present invention are described below with reference to the attached Figure 1 To the attached Figure 3 The detailed description of the embodiments will clearly show that the structural contents mentioned in the following embodiments are all based on the accompanying drawings.

[0024] Various exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0025] like Figure 1-3As shown, the present invention provides an ultra-short mechanical pencil for travel, which comprises a mechanical pencil inner core 6, an upper pen body 1, a lower pen body 3, a bolt, and a spring 5. The bolt comprises a bolt cylinder 2 and a bolt wrench 4. The bolt cylinder 2 is a cylinder with a through hole 21 at its center. The through hole 21 has a diameter of 2.69 to 2.71 mm. The bolt cylinder 2 has an outer diameter of 6.8 mm and a length of 12 mm. A 3 mm diameter hole for accommodating the bolt wrench 4 is formed transversely at a distance of 3.7 to 4.3 mm from the top of the bolt cylinder. The bolt wrench 4 is composed of a sphere 41 and a cylinder 42. The diameter of the sphere 41 is 4.5 to 6 mm, the diameter of the cylinder 42 is 3 mm, and the length is 7 to 8 mm. The surface of the cylinder 42 has an external thread matching the screw hole 22. A lead hole 43 with a diameter of 1.4 mm is opened in the middle of the cylinder 42. The length of the lower half of the pen 3 is 38 to 41 mm, the outer diameter of the middle is 10 mm, and the inner diameter of the lower half of the pen 3 is 3.2 mm. The lower pen cavity 31 has a slope transition at the bottom of the lower pen cavity 31 connected to the pen tip outlet 32. The inner diameter of the pen tip outlet 32 is 1.4 mm and the length is 0.5 mm. The outer diameter of the upper part of the lower half of the pen barrel 3 is reduced to 7 mm and has an external thread of 10 mm in length. The bottom of the lower half of the pen barrel 3 is hemispherical; the length of the upper half of the pen barrel 1 is 53~56 mm and the outer diameter is 10 mm. The upper pen cavity 11 is opened along its axial direction in the upper half of the pen barrel 1. The upper pen cavity 11 is divided into an upper part (accommodating an eraser), a middle part (accommodating an eraser) and a lower part (accommodating an eraser). The upper pen chamber 11 has an upper diameter of 8 mm and a length of 3 mm, a middle diameter of 7 mm and a length of 40-43 mm, a lower diameter of 7 mm and a length of 10 mm, and has an internal thread that matches the external thread on the upper part of the lower pen barrel 3. A notch 7 is opened in the middle of the upper pen barrel 1 for placing the bolt wrench 4 and for the bolt wrench 4 to move up, down, left and right. The notch 7 consists of three interconnected longitudinal rectangles and two transverse rectangles.The left longitudinal rectangle 71 is 5 mm long and 3.2 mm wide; the lower side of the middle longitudinal rectangle 73 is in the same straight line as the lower side of the left longitudinal rectangle 71, the distance between the middle longitudinal rectangle 73 and the left longitudinal rectangle 71 is 4 mm, the distance between the upper side of the middle longitudinal rectangle 73 and its lower side is 10 mm, and the width of the middle longitudinal rectangle 73 is 3.2 mm; the lower side of the right longitudinal rectangle 75 is parallel to the upper side of the middle longitudinal rectangle 73 and the lower side of the right longitudinal rectangle 75 is 3.2 mm lower than the upper side of the middle longitudinal rectangle 73. The upper and lower edges of rectangle 75 are 8 mm apart, and the width of right-side longitudinal rectangle 75 is 3.2 mm. Left-side transverse rectangle 72 connects left-side longitudinal rectangle 71 and middle-side longitudinal rectangle 73, and the lower edges of these three rectangles are collinear. Left-side transverse rectangle 72 is 3.2 mm wide. Right-side transverse rectangle 74 connects right-side longitudinal rectangle 75 and middle-side longitudinal rectangle 73, and the upper edges of right-side transverse rectangle 74 and middle-side longitudinal rectangle 73 are collinear. Right-side transverse rectangle 74 is 3.2 mm wide and 4 mm long. Spring 5 has a diameter of 3.5-3.9 mm and a length of 18-22 mm. Mechanical pencil reel 6 has a length of 59.5-60.1 mm and an outer diameter of 2.7-2.9 mm. It has a metal core guard at its lower end with an outer diameter of 1.2-1.3 mm. It is a standard mechanical pencil reel used in multi-purpose pens (also known as multi-function pens). The distance between the upper side of the left longitudinal rectangle 71 and the lower end of the lower half of the pen barrel 3 is 62.2-62.8 mm. When the bolt lever 4 is located at the uppermost end of the left longitudinal rectangle 71, the lower end inclined surface of the mechanical pencil lead 6 just contacts the intersection slope of the lower writing chamber 31 and the lead outlet 32, or the distance between them is less than 0.3 mm. ， The lead tube of the mechanical pencil refill 6 extends through the lead outlet 32. The diameters of the lead outlet 32, the lower writing chamber 31, the lead tube of the mechanical pencil refill 6, and the mechanical pencil refill 6 are matched to prevent the pen tip from shaking during use. The lower portion of the left longitudinal rectangle 71 provides space for pressing the bolt lever 4 to drive the bolt cylinder 2 and the mechanical pencil refill 6 to extend the lead from the lead tube of the mechanical pencil refill 6.

[0026] When assembling the ultra-short mechanical pencil for travel of the present invention, the upper end of the mechanical pencil core 6 is inserted upward into the through hole 21 of the bolt cylinder 2 until it contacts or nearly contacts the cylinder 42. The metal elasticity of the mechanical pencil core 6 causes an interference fit between the through hole 21 and the upper end of the mechanical pencil core 6, and the upper end of the mechanical pencil core 6 is fixed in the through hole 21. The insertion depth of the mechanical pencil core 6 into the through hole 21 can be finely adjusted to ensure that the distance between the upper side of the left longitudinal rectangle 71 and the lower end of the lower half of the pen body 3 matches the length of the mechanical pencil core 6. The two are then placed into the upper pen cavity 11 of the upper half of the pen body 1, with the screw hole 22 on the bolt cylinder 2 facing the notch 7. , screw the bolt wrench 4 into the screw hole 22, then put the spring 5 into the upper pen barrel 1 and pass the mechanical pencil core 6 through the spring 5, and screw the upper pen barrel 1 and the lower pen barrel 3 together; loosen the bolt wrench 4, and the surface of the sphere 41 has a linear shallow groove parallel to the lead inlet hole 43. The linear shallow groove and the pen barrel are kept parallel, so that the lead inlet hole 43 and the mechanical pencil core 6 are kept parallel. A mechanical pencil lead with a diameter of 0.5 mm is passed through the lead inlet hole 43 from the upper end of the upper pen barrel 1 and placed into the mechanical pencil core 6. Then, tighten the bolt wrench 4. At this time, the lead inlet hole 43 and the mechanical pencil core 6 are not parallel, and the lead will not fall out. When not in use, the bolt lever 4 is within the right longitudinal rectangle 75. Due to the elastic force of the spring 5, the bolt lever 4 is positioned at the top of the right longitudinal rectangle 75. Even if an external force strikes the bolt lever 4 while the pencil is in a pocket, the resistance of the spring 5 below and the left, right, top, and bottom edges of the notch 7 prevent the lead 6 from extending beyond the lower half of the pen barrel 3, potentially staining clothing or injuring the pencil tip from external impact. When in use, the bolt lever 4 is moved along the notch into the left longitudinal rectangle 71. Due to the elastic force of the spring 5, the bolt lever 4 is positioned at the top of the left longitudinal rectangle 71. At this point, the lower slope of the lead 6 abuts, or nearly abuts, the intersection of the lower pen chamber 31 and the lead outlet 32, with a gap of less than 0.3 mm. The lead tube of the lead 6 extends through the lead outlet 32. The mechanical pencil reel 6 has its own lead-ejecting spring 61. When the bolt lever 4 passes through the transverse rectangle 72, the lowermost end of the mechanical pencil reel 6 is pressed against and compressed, causing the lead-ejecting spring 61 to contract. After entering the left longitudinal rectangle 71, the lead-ejecting spring 61 recovers and has ejected the lead once. If the lead length is not appropriate, pressing the bolt lever 4 downward will cause the bolt cylinder 5 to move slightly up and down because there is space for the cylinder 42 to move up and down within the left longitudinal rectangle 71. The upper half of the mechanical pencil reel 6 moves slightly up and down with the bolt cylinder 2, thereby causing the entire mechanical pencil reel 6 to expand and contract, gradually ejecting the lead.When in use, the bolt lever 4 is within the left longitudinal rectangle 71. Due to the elastic force of the spring 5, the bolt lever 4 is located at the uppermost end of the left longitudinal rectangle 71. Due to the resistance of the spring 5 below and the obstruction of the left, right, and upper edges of the notch 7, the bolt lever 4 cannot move up, down, or left, or even slide into the left transverse rectangle 72, the middle longitudinal rectangle 73, the right transverse rectangle 74, or the right longitudinal rectangle 75, thereby causing the mechanical pencil core 6 to retract or move. After use, the bolt lever 4 is moved to the right longitudinal rectangle 75 and can be placed in a pocket for easy carrying. Because the lower end of the lower half of the pen body 3 is hemispherical and the top of the bolt lever 4 is spherical, it will not pierce the pocket or cause any damage.

[0027] The top of the upper pen chamber 11 can be inserted into a cylindrical eraser for conveniently erasing writing or drawing mistakes. Leveraging the elasticity of the eraser, an eraser with a diameter of 8.1-8.2 mm is securely fixed to the upper portion of the upper pen chamber 11, which has an inner diameter of 8 mm and a length of 3 mm. The eraser is 7-9 mm high. Use the top edge of the eraser for wiping, and remove it when refilling.

[0028] The invention has the advantages of being novel, unique, simple to use, and easy to carry, and has great promotion value.

[0029] The above is a further detailed description of the present invention in combination with specific implementation methods, and it cannot be determined that the specific implementation of the present invention is limited to this; for technical personnel in the technical fields to which the present invention belongs and related technical fields, based on the technical solution ideas of the present invention, the expansion and replacement of operating methods and data should all fall within the scope of protection of the present invention.

Claims

1. An ultra-short automatic pencil for traveling, characterized by: The invention comprises an upper pen barrel (1), a lower pen barrel (3), a bolt, a spring (5) and an inner core of an automatic pencil (6); an upper pen chamber (11) is provided in the upper pen barrel (1) along its axis, and a notch (7) is provided in the middle of the upper pen barrel (1); the shape of the notch (7) is formed by a left longitudinal rectangle (71), a left transverse rectangle (72), a middle longitudinal rectangle (73), a right transverse rectangle (74) and a right longitudinal rectangle (75) connected in sequence, and the two ends of the left transverse rectangle (72) are respectively connected to the bottom of the left longitudinal rectangle (71) and the middle longitudinal rectangle (73), and the two ends of the right transverse rectangle (74) are respectively connected to the middle longitudinal rectangle. The top of the shape (73) and the bottom of the right longitudinal rectangle (75); the lower pen cavity (31) is opened along the axis of the lower half pen barrel (3), the bottom of the lower pen cavity (31) is connected to the pen tip outlet (32), and the intersection of the lower pen cavity (31) and the pen tip outlet (32) is connected by a slope; the outer side of the lower end of the lower half pen barrel (3) is hemispherical; the upper half pen barrel (1) and the lower half pen barrel (3) are threadedly connected, and the overall length after connection is less than 9 cm; the bolt includes a bolt cylinder (2) and a bolt wrench (4), wherein the bolt cylinder (2) is opened along the axis of the bolt cylinder (2), and a screw hole (22) perpendicular to the through hole (21) is opened in the middle and upper part of the bolt cylinder (2); the bolt The wrench (4) is composed of a sphere (41) connected to a cylinder (42), a thread matching the screw hole (22) is provided on the surface of the cylinder (42), and a lead hole (43) is provided in the middle of the cylinder (42); the bolt cylinder (2) is installed in the upper pen cavity (11), and the cylinder (42) of the bolt wrench (4) passes through the notch (7) and is screwed into the screw hole (22) of the bolt cylinder (2). By moving the bolt wrench (4) up and down and left and right along the notch (7), the bolt cylinder (2) is driven to move in the upper pen cavity (11); the spring (5) is arranged in the upper pen cavity (11), the upper end of the spring (5) is against the bottom end of the bolt cylinder (2), and the lower end of the spring (5) is against the lower half of the pen shaft (3). The top of the automatic pencil core (6) passes through the spring (5) and is inserted upward into the through hole (21) of the bolt cylinder (2). The metal elasticity and interference fit of the automatic pencil core (6) are used to fix the automatic pencil core (6) in the through hole (21). The lower part of the automatic pencil core (6) is located in the lower pen cavity (31). The automatic pencil core (6) is also provided with a lead spring (61). The length of the automatic pencil core (6) is 59.5~60.1 mm, the outer diameter is 2.7~2.9 mm, and the lower end has a core protection tube with an outer diameter of 1.2~1.3 mm. The metal material is a conventional general-purpose automatic pencil core for a multi-purpose pen. The surface of the sphere (41) has a linear shallow groove parallel to the lead inlet hole (43).

2. The ultra-short mechanical pencil for traveling according to claim 1, characterized in that: The length of the upper pen barrel (1) is 53-56 mm, and the outer diameter is 10 mm; the upper diameter of the upper pen chamber (11) is 8 mm, the length is 3 mm, the middle diameter is 7 mm, the length is 40-43 mm, the lower diameter is 7 mm, the length is 10 mm, and it has an internal thread; the length of the lower pen barrel (3) is 38-41 mm, the outer diameter of the middle is 10 mm, the outer diameter of the upper part is reduced to 7 mm and it has an external thread with a length of 10 mm, the diameter of the lower pen chamber (31) is 3.2 mm, and the diameter of the pen tip outlet (32) is 1.4 mm, and the length is 0.5 mm.

3. The ultra-short mechanical pencil for traveling according to claim 1, characterized in that: The outer diameter of the bolt cylinder (2) is 6.8 mm and the length is 12 mm. The diameter of the through hole (21) is 2.69-2.71 mm. The diameter of the screw hole (22) is 3 mm. The depth of the screw hole (22) is 4.1-4.4 mm. The distance between the screw hole (22) and the top of the bolt cylinder (2) is 3.7-4.3 mm.

4. The ultra-short mechanical pencil for traveling according to claim 1, characterized in that: The diameter of the sphere (41) is 4.5-6 mm, the diameter of the cylinder (42) is 3 mm, the length is 7-8 mm, and the diameter of the lead hole (43) is 1.4 mm.

5. The ultra-short mechanical pencil for traveling according to claim 1, characterized in that: The spring (5) has a diameter of 3.5 to 3.9 mm and a length of 18 to 22 mm.

6. The ultra-short mechanical pencil for traveling according to claim 1, characterized in that: The width of the left longitudinal rectangle (71), the left transverse rectangle (72), the middle longitudinal rectangle (73), the right transverse rectangle (74) and the right longitudinal rectangle (75) are all 3.2 mm, and the lengths are 5 mm, 4 mm, 10 mm, 4 mm and 8 mm, respectively.

7. The ultra-short mechanical pencil for traveling according to claim 1, characterized in that: The distance between the upper side of the left longitudinal rectangle (71) and the lower end of the lower half of the pen holder (3) is 62.2 to 62.8 mm.

8. The ultra-short mechanical pencil for traveling according to claim 1, characterized in that: The top of the upper pen cavity (11) is plugged with a cylindrical eraser.

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