Pen with adjustable gravity center
By designing an adjustable center of gravity mechanism, the problem of pen grip discomfort caused by a fixed center of gravity in ballpoint pens is solved. This allows for adjustment of the center of gravity position according to personal habits, improving writing comfort and stability, and adapting to the usage needs of different age groups.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-15
- Publication Date
- 2026-04-07
AI Technical Summary
The fixed center of gravity of existing ballpoint pens causes discomfort when holding the pen, hand fatigue during long writing sessions, and makes it difficult to adjust the center of gravity according to individual pen-holding habits to achieve the best feel.
Design a pen with an adjustable center of gravity, including a shell, a writing mechanism, and a center of gravity adjustment mechanism. Through the cooperation of a counterweight, a traction part, and an operating part, the center of gravity is allowed to move along the length of the pen, with an adjustment range of not less than one-third of the total length of the pen. The counterweight and the inner side of the shell form a circumferential limit, and the operating part achieves precise adjustment of the center of gravity through the cooperation of threads and tangential surfaces.
It allows for free adjustment of the center of gravity position according to the user's pen-holding posture, improving writing comfort and stability, reducing hand fatigue, and adapting to the usage needs of different age groups.
Smart Images
Figure CN224089930U_ABST
Abstract
Description
Technical Field
[0001] This patent belongs to the field of stationery technology, specifically relating to a pen with an adjustable center of gravity. Background Technology
[0002] The position and stability of a pen's center of gravity affect the feel primarily in the following ways, and a design with a finely adjustable center of gravity offers significant advantages over pens with large shifts in center of gravity:
[0003] The center of gravity directly affects the balance when holding the pen. If the center of gravity is located in the middle of the pen barrel or close to the grip (such as in a low center of gravity design), the pen is more stable when writing, reducing shaking and tilting. For example, Japanese drawing tools were the first to introduce the concept of a low center of gravity, enhancing control over the nib by lowering the center of gravity; this design was later widely adopted in everyday writing instruments. Conversely, a center of gravity that is too far back or unevenly distributed will cause the pen to feel floaty, requiring extra effort to adjust and easily leading to hand fatigue.
[0004] A pen that is too heavy will increase the burden on your wrist, while a pen that is too light may make it difficult to control your strokes due to a lack of weight. For example, while metal pens may look high-quality, they can cause hand fatigue after prolonged use; resin pens are more suitable for daily writing due to their lightweight nature. In addition, the matching of the center of gravity and the length of the pen is also crucial—if the pen is too long but the center of gravity is too far back, the lack of support for the thumb and forefinger will exacerbate fatigue.
[0005] A well-designed center of gravity concentrates weight in the tip area, reducing the pulling force of the pen barrel on the nib and making writing more precise, especially suitable for scenarios requiring fine lines (such as drawing or shorthand). A pen with a high center of gravity, on the other hand, may result in weak, uneven strokes, affecting the consistency of the handwriting.
[0006] In particular, in the field of ballpoint pens, traditional ballpoint pens have varying centers of gravity due to the different weights of their constituent parts. Furthermore, because users hold the pen in different ways, this can lead to problems such as a high center of gravity, difficulty in pen control, and hand fatigue during prolonged writing. Ballpoint pens, on the other hand, offer a more comfortable writing experience with a smaller center of gravity range. The center of gravity of a ballpoint pen can be fine-tuned according to the size and shape of the user's hand to achieve a better fit.
[0007] How to provide a pen solution with an adjustable center of gravity, allowing users to better adjust the pen's center of gravity according to their own pen-holding habits, and to obtain the most suitable center of gravity height for their pen-holding posture, is a technical problem that urgently needs to be solved in the pen industry. Utility Model Content
[0008] The purpose of this patent is to optimize the feel of an adjustable pen and to solve this technical problem:
[0009] This patent provides a pen with an adjustable center of gravity, including: a shell, a writing mechanism, and a center of gravity adjustment mechanism; the center of gravity adjustment mechanism is movably disposed within the shell along the length direction of the pen; the center of gravity adjustment mechanism further includes a counterweight, a traction part, and an operating part, the operating part being operable to move the center of gravity of the center of gravity adjustment mechanism along the length direction; the total length of the center of gravity adjustment mechanism is not less than one-third of the total length of the pen.
[0010] Furthermore, the center of gravity adjustment mechanism is mounted on the outside of the writing mechanism.
[0011] Furthermore, the counterweight, traction, and operating parts all have through holes through which the writing mechanism can pass.
[0012] Furthermore, a counterweight is disposed at the first end of the traction unit, the outer surface of the traction unit has a first thread, and the inner surface of the operating unit has a second thread that mates with the first thread.
[0013] Furthermore, a circumferential limiting part is provided on the outer side of the counterweight part, which cooperates with the inner side of the outer shell.
[0014] Furthermore, a first cut surface is provided on the outer side of the counterweight, and a second cut surface is provided on the inner side of the outer shell. The first cut surface and the second cut surface cooperate with each other to form a circumferential limiting part.
[0015] Furthermore, the counterweight and traction components are integrally molded.
[0016] Furthermore, the housing includes an opening for exposing at least a portion of the operating part.
[0017] Furthermore, the opening has an axial limiting portion that restricts the movement of the operating portion in the extension direction.
[0018] Furthermore, the opening includes a first opening and a second opening that are circumferentially opposite each other.
[0019] Furthermore, the distance from the center of the opening to the tip of the pen is 45-65% of the total length of the pen.
[0020] Furthermore, the casing includes a barrel and a neck, which are detachably connected.
[0021] Furthermore, the pen neck includes a window portion for making the position of the counterweight portion visible.
[0022] Compared to the fixed center of gravity of traditional ballpoint pens, this invention allows for stepless adjustment of the pen's center of gravity. This allows users to freely adjust the center of gravity according to their grip posture, solving the problems of poor pen control and hand fatigue caused by an excessively high center of gravity during prolonged writing.
[0023] The center of gravity has been adjusted to meet the needs of users of different age groups. Compared with existing technologies, it can further improve the adjustable feel and is more suitable for pen use scenarios, especially for ballpoint pens. Attached Figure Description
[0024] The above content of this patent and the following detailed embodiments will be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are merely examples of the claimed technical solution.
[0025] Figure 1 A three-dimensional schematic diagram of a specific embodiment of a pen with an adjustable center of gravity, omitting the pen neck and tip;
[0026] Figure 2 This is a side view of a specific embodiment of a pen with an adjustable center of gravity, facing the viewing window.
[0027] Figure 3 An exploded view of a specific embodiment of a pen with an adjustable center of gravity;
[0028] Figure 4 A cross-sectional schematic diagram of a specific embodiment of a pen with an adjustable center of gravity;
[0029] Figure 5 This is a partial perspective view of a specific embodiment of a pen with an adjustable center of gravity, showing the state of the center of gravity adjustment mechanism within the housing;
[0030] Figure 6a , Figure 6b , Figure 6c This is a usage diagram of a specific embodiment of an adjustable-center-of-gravity pen (the pen neck is hidden, but the relative positions of the tip and the pen barrel are maintained), wherein... Figure 6a The center of gravity is adjusted to its limit, close to the tip of the pen; Figure 6b The center of gravity is adjusted to the middle position; Figure 6c The center of gravity is adjusted to the extreme state near the back of the pen.
[0031] Explanation of reference numerals in the attached figures:
[0032] Casing: 100
[0033] Pen barrel: 110
[0034] Opening: 111
[0035] Pen neck: 120
[0036] Window section: 121
[0037] Pointed sleeve: 130
[0038] Center of gravity adjustment mechanism: 200
[0039] Operations Department: 210
[0040] Traction unit: 220
[0041] Counterweight: 230
[0042] First facet: 231
[0043] Writing institutions: 300 Detailed Implementation
[0044] The detailed features and advantages of this patent are described below in the specific embodiments. The content is sufficient to enable any person skilled in the art to understand the technical content of this patent and implement it accordingly. Based on the specification, claims and drawings disclosed in this specification, a person skilled in the art can easily understand the related objectives and advantages of this patent.
[0045] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not indicate the only possible implementation. The terms "upper," "lower," etc., indicating orientation or positional relationships are defined with reference to the coordinates of the accompanying drawings and are only for the convenience of describing this patent 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, and therefore should not be construed as a limitation of this patent. The terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0046] refer to Figure 1 ~6. The following examples of an adjustable pen will further illustrate this patent.
[0047] The pen with adjustable center of gravity of this patent includes: a shell 100, a center of gravity adjustment mechanism 200, and a writing mechanism 300.
[0048] The outer casing 100 includes a pen barrel 110, a pen neck 120, and a tip 130, with the pen barrel 110 and pen neck 120 detachably connected. A center-of-gravity adjustment mechanism 200 is movably disposed within the outer casing 100 along the length of the pen and includes an operating part 210, a traction part 220, and a counterweight part 230. The traction part 220 can be operated to move the center of gravity of the center-of-gravity adjustment mechanism along its length. The total length of the center-of-gravity adjustment mechanism 200 is not less than one-third of the total length of the pen, thus facilitating center-of-gravity adjustment to meet the usage needs of different age groups. Furthermore, the change in center of gravity during adjustment is slow and gentle, providing a better user experience.
[0049] like Figure 1 As shown, the center of gravity adjustment mechanism 200 is sleeved on the outside of the writing mechanism 300. The counterweight 230, the traction part 220, and the operating part 210 all have through holes through which the writing mechanism 300 can pass. The counterweight 230 is disposed at the first end of the traction part 220. The outer surface of the traction part 220 has a first thread, and the inner surface of the operating part 210 has a second thread (not shown in the figure) that mates with the first thread.
[0050] The outer side of the counterweight 230 is provided with a circumferential limiting part that cooperates with the inner side of the outer shell 100. Specifically, the outer side of the counterweight 230 is provided with a first cut surface 231, and the inner side of the outer shell 100 is provided with a second cut surface (not shown in the figure). The first cut surface 231 and the second cut surface cooperate with each other to form the circumferential limiting part.
[0051] The counterweight 230 and the traction unit 220 can be integrally formed or fixedly connected by means of snaps, threads, etc. Understandably, integral forming helps to reduce the number of parts, assembly structure and assembly processes, and reduce production costs. In addition, assembly will introduce assembly errors. To eliminate assembly errors, it is necessary to reduce the tolerance of parts. Reducing the tolerance of parts will inevitably increase the quality cost. Therefore, integral forming also helps to reduce the quality cost.
[0052] like Figure 3 As shown, to facilitate easier adjustment of the pen's center of gravity, the pen neck 120 includes a window 121 for making the position of the counterweight 230 visible. The pen barrel 110 has an opening 111, which includes a first opening and a second opening facing each other in the circumferential direction, both for exposing the operating part 210 for consumer operation. In one specific embodiment, the inner side of the opening has an axial limiting part that restricts the movement of the operating part 21 in the extension direction. The distance from the center of the opening 111 to the front end of the pen can be 45% to 65% of the total length of the pen, which facilitates the consumer to operate the operating part 210 with their thumb or in combination with their index finger while holding the pen neck 120 to grasp the center of gravity.
[0053] Specifically, the window portion 121 is a strip-shaped through hole.
[0054] For a specific embodiment, please refer to... Figure 4 The total length of the center-of-gravity adjustment mechanism 200 is L1, and the total length of the pen is L2. Obviously, L1 is greater than one-third of L2 but less than two-thirds of L2. The distance from the center of the opening 111 to the tip of the pen is equivalent to L3, and L3 is approximately 50% of L2.
[0055] The writing mechanism 300 can be a common writing mechanism such as a ballpoint pen, fountain pen, or soft brush pen. For example, it includes a refill, a push button, and a spring. The refill is fitted with a spring that drives the refill to move toward the pen barrel 110. The push button is inserted into the end of the pen barrel 110 away from the neck 120. The push button contains a sliding pressing rod and a connector. The connector rests against the pen barrel 110, and one end of the connector is inserted and fixed into the pressing rod. The connector drives the refill to extend and retract into the pen barrel shell through a telescopic locking mechanism. The push button and the spring enable the refill to extend and retract, thereby protecting the pen tip of the writing mechanism 300.
[0056] More specifically, the telescopic locking mechanism can be a conventional telescopic locking mechanism. One exemplary telescopic locking mechanism allows the pressing rod and the connector to work together to activate the telescopic locking structure when the pen is not in use. Simultaneously, the writing mechanism 300 retracts into the pen under the action of a spring, thus protecting the pen tip. A top component facilitates the installation of the pressing rod onto the pen barrel, while the pressing rod is fixed to the connector, preventing it from being pushed out of the outer casing 100 by the writing mechanism 300, ensuring the pen's normal function.
[0057] This patent also includes a pen clip, which is connected to the pen barrel 110 and is made of a flexible material.
[0058] Similarly, the housing 100 may also include a tip 130, which is threadedly connected to the pen neck 120.
[0059] When using this patent, rotating the operating part 210 allows it to rotate relative to the traction part 220. Due to the planar fit between the first slit 231 and the second slit, the traction part 220 cannot rotate circumferentially, but can only move in the length direction, causing the counterweight part 230 to move in the length direction as well, thus changing the center of gravity position of the center of gravity adjustment mechanism 200. As shown in Figure 6, a represents the extreme state where the center of gravity is adjusted to near the tip of the pen, b represents the state where the center of gravity is adjusted to the middle, and c represents the extreme state where the center of gravity is adjusted to near the rear end of the pen.
[0060] More specifically, the adjustable center of gravity structure provided in this patent consists of a metal counterweight 230, a screw 220, and a rotary adjustment component 210. The metal counterweight 230 is fastened to the bottom of the screw 220 and can move up and down with the screw 220. Flat surfaces 231 are cut on both sides of the connection point between the bottom of the screw 220 and the metal counterweight 230. These flat surfaces 231 mate with the flat surface of the inner wall of the pen neck 120, ensuring that the metal counterweight 230 cannot rotate circumferentially when the rotary adjustment component 210 is rotated, thus restricting the screw 220 to only move up and down. The screw 220 is hollow and has threads on its outer wall. The pen refill of the writing mechanism 300 passes through the inner hole. The threads on the outer wall of the screw 220 match the threads in the inner hole of the rotary adjustment component 210, allowing it to move up and down within the pen neck 120 as the rotary adjustment component 210 rotates. The rotating adjustment component 210 is fixed inside the pen barrel 110 and protrudes through openings 111 on both sides of the pen barrel 110 at corresponding positions, making it convenient to pinch and rotate for adjustment. The rotating adjustment component 210 has threads inside that match the outer wall of the screw 220. Operating the rotating adjustment component 210 causes the screw 220 and the metal counterweight 230 to move up and down within the pen neck 120, thereby adjusting the center of gravity.
[0061] The terminology and expressions used herein are for descriptive purposes only and this patent should not be limited to them. The use of these terms and expressions does not imply the exclusion of any illustrative and descriptive equivalent features (or parts thereof), and it should be recognized that various possible modifications should also be included within the scope of the claims. Other modifications, variations, and substitutions may also exist. Accordingly, the claims should be considered to cover all such equivalents.
[0062] Similarly, it should be noted that although this patent has been described with reference to the specific embodiments described above, those skilled in the art should recognize that the above embodiments are only used to illustrate this patent, and various equivalent changes or substitutions can be made without departing from the spirit of this patent. Therefore, any changes or modifications to the above embodiments within the essential spirit of this patent will fall within the scope of the claims of this patent.
Claims
1. A pen with an adjustable center of gravity, characterized in that, include: The casing, writing mechanism, and center of gravity adjustment mechanism; The center of gravity adjustment mechanism is movably disposed within the outer casing along the length direction of the pen; The center of gravity adjustment mechanism further includes a counterweight, a traction unit, and an operating unit. The operating unit can be operated to move the center of gravity of the center of gravity adjustment mechanism along the length direction. The total length of the center of gravity adjustment mechanism is not less than one-third of the total length of the pen.
2. The pen according to claim 1, characterized in that, The center of gravity adjustment mechanism is fitted onto the outside of the writing mechanism.
3. The pen according to claim 2, characterized in that, The counterweight, the traction unit, and the operating unit all have through holes through which the writing mechanism can pass.
4. The pen according to claim 3, characterized in that, The counterweight is disposed at the first end of the traction part, the outer surface of the traction part has a first thread, and the inner surface of the operating part has a second thread that mates with the first thread.
5. The pen according to claim 4, characterized in that, The outer side of the counterweight is provided with a circumferential limiting part that cooperates with the inner side of the outer shell.
6. The pen according to claim 5, characterized in that, The outer side of the counterweight is provided with a first cut surface, and the inner side of the outer shell is provided with a second cut surface. The first cut surface and the second cut surface cooperate with each other to form the circumferential limiting part.
7. The pen according to claim 1, characterized in that, The counterweight and the traction unit are integrally formed.
8. The pen according to claim 1, characterized in that, The housing includes an opening for exposing at least a portion of the operating part; the opening has an axial limiting portion for restricting movement of the operating part in the extension direction; the opening includes a first opening and a second opening that are circumferentially opposite each other.
9. The pen according to claim 8, characterized in that, The distance from the center of the opening to the tip of the pen is 45-65% of the total length of the pen.
10. The pen according to claim 1, characterized in that, The housing includes a pen barrel and a pen neck, which are detachably connected; the pen neck includes a window portion for making the position of the counterweight visible.