A pencil holder and a pencil firmly combined with double adhesive

Abstract

The patent discloses a pen holder with firm combination of double adhesives and a pen, which comprises a first holding part and a second holding part, the second holding part can be detachably assembled into a containing cavity with the first holding part, and the first holding part and the second holding part are firmly combined through mechanical interlocking between limiting parts after assembly, so that the combination area and the physical occlusion strength of the two are greatly increased. The design makes the pen with the pen holder resistant to frequent holding pressure and friction in daily use, and can effectively prevent the second holding part from loosening, rotating or falling off even if it is accidentally dropped, thereby reducing the risk of structural damage and prolonging the service life of the product. Compared with the traditional plane combination surface, the mechanical interlocking structure disperses stress concentration and avoids the interface failure due to local fatigue, ensuring that the pen can still maintain the initial firm state after long-term use, thereby improving the durability of the pen holder.

Description

Technical Field

[0001] This patent relates to the field of pen grip technology, and in particular to a pen grip and pen tool with a double adhesive bonding. Background Technology

[0002] Currently, most pencils on the market are made of wood. Wooden pencils are essential for children to practice writing and do homework before and after school. However, because the surface of the pencil is relatively hard, children's hands are delicate, and holding a pencil for a long time can easily cause fatigue, calluses, and finger deformities, affecting their interest in using pencils. Therefore, a durable and comfortable pencil grip is usually needed to use the pencil. Focusing on students of other age groups, although they do not often use wooden pencils, ballpoint pens or gel pens are their most frequently used stationery. When academic pressure is too great or there is a lot of homework, students will rapidly increase their writing speed, neglecting the importance of proper pen grip. This leads to many students developing calluses of varying sizes on their knuckles, which can cause irreversible finger deformities over time. Therefore, a pencil grip is needed to use the pencil.

[0003] A pen grip is a writing aid designed to improve writing posture. It guides users to hold the pen correctly, reducing hand tension and pressure while writing. These pen grips are designed according to ergonomic principles to adapt to the natural shape and movement of the hand. Posture-correcting pen grips are typically easy to install and remove, suitable for users of different ages and hand shapes. For children, they help cultivate good writing habits and prevent writing difficulties caused by poor pen grip posture.

[0004] In the field of pen grip technology, the dual-layer hard and soft rubber pen grip is a common design, aiming to improve the pen-holding experience by combining the structural support of hard rubber with the comfortable feel of soft rubber. However, existing dual-layer hard and soft rubber pen grips have significant problems that limit their performance and application. In traditional designs, the interface between the hard and soft rubber is usually flat or a simple curved surface, resulting in a small bonding area and limited adhesive strength. In daily use, due to frequent gripping pressure and friction, this design is prone to causing the soft rubber portion to loosen, rotate, or even detach, affecting not only the appearance but also potentially leading to functional failure. Especially in the event of an accidental drop, the impact force is concentrated at the interface, increasing the risk of separation and reducing the grip's durability.

[0005] Furthermore, with prolonged use, the soft rubber material in existing pen grips may harden or shrink due to aging. The smaller contact area of ​​the grip cannot effectively compensate for this change, leading to a further decrease in bonding strength and insufficient reliability. Simultaneously, the soft rubber portion provides weak support when used alone, making it prone to deformation during gripping and affecting writing stability. Users often experience significant fingertip pressure when using such grips, leading to fatigue and poor comfort after extended writing sessions. These issues are particularly pronounced in situations requiring precise control, such as drawing or prolonged office work, limiting the overall user experience of the pen.

[0006] Several solutions have been proposed to address these issues, such as using chemical adhesives to enhance bonding strength. However, this method may introduce environmental and health risks, and the adhesive itself may also age and fail. Another approach is to increase the roughness of the bonding surfaces, but the effect is limited and cannot fundamentally solve the problem of mechanical loosening. Therefore, there is an urgent need for a pen grip with a strong double-sided adhesive bond for pens, which can achieve a strong, durable, reliable, and comfortable grip with both soft and hard adhesives without increasing complexity. Utility Model Content

[0007] This patent aims to solve the problems of loosening, rotation, and detachment caused by the small and flat joint surface between the second and first grip parts in existing pen grips, as well as the problems of insufficient durability, reliability, and comfort. This patent provides the following technical solutions: First aspect: A pen grip firmly bonded by two adhesives is provided, including a first grip part and a second grip part. The first grip part includes a receiving cavity. The second grip part can be detachably inserted into the receiving cavity and assembled with the first grip part, or the second grip part and the first grip part can be integrally formed by two-color injection molding. The first grip part and the second grip part after bonding are prevented from falling off by a limiting part.

[0008] Furthermore, the first gripping part includes a first limiting part disposed on the inner wall of the first gripping part; the second gripping part includes a second limiting part disposed on the outer wall of the second gripping part.

[0009] Furthermore, after the first gripping part and the second gripping part are combined, the first limiting part and the second limiting part form a mechanical interlock; the mechanical interlock is one of the following: concave-convex engagement interlock, hook anchoring interlock, wrapping interlock, and rotation locking interlock.

[0010] Furthermore, if the mechanical interlocking method is a concave-convex interlocking, the mating surface shape of the first limiting part and the second limiting part is one of the following: sawtooth shape, wave shape, dovetail groove shape, hole shape or barb shape.

[0011] Furthermore, the first grip portion also includes a thumb pressing hole and an index finger pressing hole, which extend from the outer wall of the first grip portion into the receiving cavity; the outer wall of the first grip portion and around the thumb pressing hole and index finger pressing hole are respectively provided with thumb anti-slip strips and index finger anti-slip strips to improve grip comfort.

[0012] Furthermore, the second gripping part also includes a thumb protrusion and an index finger protrusion, which protrude from the outer wall of the second gripping part; the protruding sidewalls of the thumb protrusion and the index finger protrusion are respectively provided with thumb protrusion stop strips and index finger protrusion stop strips for limiting positioning.

[0013] Furthermore, after the first gripping part and the second gripping part are combined, the thumb protrusion protrudes from the thumb pressing hole to form the thumb pressing part, and the index finger protrusion protrudes from the index finger pressing hole to form the index finger pressing part.

[0014] Furthermore, the first gripping part is made of hard or soft rubber material; the second gripping part is made of hard or soft rubber material.

[0015] Furthermore, the hard material of the second gripping part is one of general-purpose plastics, engineering plastics, fiber-reinforced plastics, thermoplastic elastomers, silicone, or rubber; the soft material of the second gripping part is one of general-purpose plastics, engineering plastics, fiber-reinforced plastics, thermoplastic elastomers, silicone, or rubber.

[0016] The second aspect: to provide a pen, which includes a pen barrel and the aforementioned pen grip sleeved on the pen barrel.

[0017] This patent has the following beneficial effects: 1. This patent relates to the field of pen cap technology, a pen grip and pen tool with double adhesive bonding, including a first grip part and a second grip part, the second grip part being detachably inserted into the receiving cavity for assembly with the first grip part, and the first grip part and the second grip part being firmly bonded by mechanical interlocking between limiting parts after assembly.

[0018] 2. In this patent, the mechanical interlocking structure of the first and second gripping parts, employing a concave-convex interlocking mechanism, significantly increases the contact area and physical interlocking strength. This design allows pens using this grip to withstand frequent gripping pressure and friction during daily use. Even after accidental drops, it effectively prevents the second gripping part from loosening, rotating, or detaching, thereby reducing the risk of structural damage and extending the product's lifespan. Compared to traditional planar contact surfaces, the mechanical interlocking structure disperses stress concentration, preventing interface failure due to localized fatigue and ensuring the grip maintains its initial firmness even after prolonged use, thus improving the grip's durability.

[0019] 3. In this patent, the enlarged mating surface and mechanical interlocking mechanism enhance resistance to material aging. While the soft rubber material may slightly harden or shrink over time, the toothed or wavy mating surface maintains sufficient bonding force between the first and second gripping parts, preventing a decrease in bonding force due to environmental changes or chemical factors. Furthermore, the design of the limiting part and the stop strip further constrains the movement of the second gripping part, avoiding micro-wear during use and improving the overall structural stability. This reliability is not only evident in normal writing scenarios but also performs excellently in harsh environments such as high temperature and high humidity, ensuring the pen functions reliably under various conditions.

[0020] 4. In this patent, the thumb and index finger protrusions of the second grip protrude from the pressing holes of the first grip, providing a soft and responsive contact surface for the fingers. This design, which differentiates between soft and hard areas, cushions the thumb and index finger when holding the pen, reducing fingertip pressure and alleviating fatigue from prolonged writing. Simultaneously, the anti-slip strips on the outer wall of the first grip increase friction, preventing finger slippage and improving grip stability and operational precision. Overall, this design balances a soft touch with rigid support, making it more comfortable and effortless for users.

[0021] 5. In this patent, by optimizing the structure and material selection, the pen grip can be mass-produced using standard injection molding processes, reducing costs while ensuring quality.

[0022] 6. In this patent, the mechanical interlocking design reduces reliance on specialized adhesives, lowering production complexity and environmental impact. Furthermore, the modular design of the pen grip allows for the replacement of the soft rubber parts, extending the product lifecycle and aligning with sustainable development principles. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this patent, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this patent and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is an assembly diagram of the pen grip for this patent. Figure 2 This is an exploded view of the pen grip of this patent. Figure 3 Here is another exploded view of the pen grip of this patent; Figure 4 This is a perspective view of the first gripping part of this patent (the first limiting part is not shown). Figure 5This is a perspective view of the first gripping part from another angle (the first limiting part is not shown). Figure 6 This is a perspective view of the first gripping part of this patent; Figure 7 This is a perspective view of the second gripping part of this patent.

[0025] The reference numerals in the attached figures are explained as follows: 100: First gripping part; 110: Receiving cavity; 120: First limiting part; 130: Thumb press hole; 140: Index finger press hole; 150: Thumb anti-slip strip; 160: Anti-slip strip for index finger; 200: Second grip section; 210: Second limiting part; 220: Thumb protrusion; 230: The protruding part of the index finger; 240: Thumb protrusion on the stop bar; 250: The index finger protrudes from the guardrail. Detailed Implementation

[0026] 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.

[0027] To make the objectives, technical solutions, and advantages of this patent clearer, the embodiments of this patent will be described in further detail below with reference to the accompanying drawings.

[0028] The pen grip provided in this application is compatible with pen barrels of different diameters, but it does not impose many limitations on the types of pens. It is easy to understand that the pen grip provided in this application can be used with ballpoint pens, pencils, mechanical pencils, markers, highlighters, whiteboard markers, crayons, fountain pens, and erasable pens. In this embodiment, the pen used is a pencil, which includes the pencil tip and the pencil barrel. In the following embodiment, the specific pencil will be used to refer to the pens that are generally applicable.

[0029] A pen grip with a strong double-adhesive bond; please refer to [reference needed]. Figures 1-3The device comprises two core components: a first grip portion 100 and a second grip portion 200. In this embodiment, the first grip portion 100 and the second grip portion 200 are detachable and assembleable. The first grip portion 100, as the skeleton structure of the pen grip, is made of a material with high rigidity and is responsible for providing overall support and shape stability. The second grip portion 200 is made of a material with good elasticity and is responsible for providing a comfortable grip and anti-slip function.

[0030] The first gripping part 100 forms a long, tubular structure that extends from front to back. The front end of the first gripping part 100 is the inlet, and the rear end is the outlet. The internal cavity of the cylinder is a receiving cavity 110, which is used to receive the second gripping part 200. After the second gripping part 200 enters the receiving cavity 110, it slides from the inlet to the outlet until it forms a mechanical interlock with the first limiting part 120 on the inner wall of the cylinder, which is used to fix the second gripping part 200 into the receiving cavity 110.

[0031] Please refer to Figures 4-6 The pen body has a thumb pressing hole 130 and an index finger pressing hole 140 penetrating through the middle of the body. These two holes extend from the outer wall of the first grip part 100 into the receiving cavity 110, and their positions correspond to the natural placement points of the thumb and index finger when holding the pen. Around the thumb pressing hole 130, there is a thumb anti-slip strip 150 for thumb pressing, and around the index finger pressing hole 140, there is an index finger anti-slip strip 160 for index finger pressing. These anti-slip strips, through their tiny textured or granular design, increase the friction between the fingers and the pen grip surface, preventing slippage and improving grip stability.

[0032] Specifically, the thumb pressing hole 130 and the index finger pressing hole 140 are arranged adjacent to each other, conforming to the standard pen-holding posture; the size of the thumb pressing hole 130 and the index finger pressing hole 140 should be smaller than the size of the index finger and thumb. Furthermore, the thumb anti-slip strip 150 and the index finger anti-slip strip 160 surrounding the thumb pressing hole 130 and the index finger pressing hole 140 are designed according to the average finger size of teenagers, and their concave arc shape is used to increase the friction between the contact surface and the fingertip, making it less likely for the pen holder to slip during the grip; the arc-shaped baffles of the thumb anti-slip strip 150 and the index finger anti-slip strip 160 are arranged with three baffles on each arc surface according to the shape of fingerprints.

[0033] Please refer to Figure 7 The second grip portion 200 forms a short tubular structure that runs through the front and back. The front end of the second grip portion 200 is the inlet and the rear end is the outlet. The internal cavity of the tube is used to accommodate the pen barrel. The outer wall of the second grip portion 200 is provided with a second limiting portion 210 along the circumference.

[0034] The second grip portion 200 is correspondingly provided with a thumb protrusion 220 and an index finger protrusion 230. These two protrusions rise from the outer wall of the second grip portion 200, and their shape and size match the thumb pressing hole 130 and index finger pressing hole 140 of the first grip portion 100. A thumb protrusion stop strip 240 and an index finger protrusion stop strip 250 are also provided on the side walls of the thumb protrusion 220 and the index finger protrusion 230, respectively. After assembly, the thumb protrusion stop strip 240 and the index finger protrusion stop strip 250 serve a limiting function, preventing the thumb protrusion 220 from falling out of the thumb pressing hole 130 and preventing the index finger protrusion 230 from excessively moving and rotating within the index finger pressing hole 140.

[0035] An internal receiving cavity 110 is provided, the shape of which matches the outer shape of the second grip 200, ensuring that the second grip 200 can be smoothly inserted and fixed inside the first grip 100. A first limiting portion 120, a continuous serrated structure, is provided circumferentially on the inner wall of the receiving cavity 110. A second limiting portion 210, a serrated structure that mates with the first limiting portion 120, is provided circumferentially on the outer wall of the second grip 200. When the second grip 200 enters the receiving cavity 110 and engages with the first grip 100, the first limiting portion 120 and the second limiting portion 210 form a mechanical interlock. This interlocking mechanism effectively prevents loosening, rotation, and detachment during use by increasing the contact area and physical engagement strength. At the same time, the thumb protrusion 220 of the second gripping part 200 enters the thumb pressing hole 130 of the first gripping part 100 and is fixed by the thumb protrusion stop strip 240, and the index finger protrusion 230 enters the index finger pressing hole 140 and is fixed by the index finger protrusion stop strip 250.

[0036] During assembly, the second grip 200 is first aligned with the entrance of the receiving cavity 110 of the first grip 100, and gentle pressure is applied to allow the second grip 200 to gradually enter the receiving cavity 110. Due to the elasticity and deformability of the soft rubber material, the second grip 200 undergoes slight compression upon entering the receiving cavity 110, thus smoothly passing through the opening of the receiving cavity 110. Once the second grip 200 is fully inserted into the receiving cavity 110, the second limiting portion 210 on the outer wall of the second grip 200 engages with the first limiting portion 120 on the inner wall of the first grip 100, forming a secure mechanical connection.

[0037] The specific method of this mechanical interlock is a concave-convex meshing interlock. The mating surfaces of the first limiting part 120 and the second limiting part 210 are designed as sawtooth mating surfaces, so that multiple anchor points are generated when the two are mated to resist external pull-out forces.

[0038] When the first grip 100 and the second grip 200 are assembled, the thumb protrusion 220 of the second grip 200 protrudes from the thumb pressing hole 130 of the first grip 100 to form a thumb pressing part; similarly, the index finger protrusion 230 protrudes from the index finger pressing hole 140 to form an index finger pressing part. This design allows the user's thumb and index finger to directly contact the soft rubber material when holding the pen, obtaining a soft touch and good feedback, while the hard rubber part provides a supporting frame to prevent the soft rubber part from deforming due to long-term pressure.

[0039] In the specific manufacturing process, the first grip part 100 is usually molded by injection molding. The material can be general plastics such as ABS and polypropylene, which are low cost, easy to process, and suitable for mass production; engineering plastics such as polycarbonate and nylon can also be used, which are high strength and wear-resistant and suitable for high-end pens; or fiber-reinforced plastics such as glass fiber reinforced nylon can be used to further improve the rigidity and durability of the first grip part 100.

[0040] The second gripping part 200 is made of soft material by injection molding or casting. The material can be thermoplastic elastomers such as SEBS and TPU, which have good elasticity, strong adhesion to hard plastic, and are easy to integrally mold with hard plastic through two-color injection molding process; silicone can also be used, which has excellent biocompatibility and anti-aging properties and a comfortable feel, but may require additional mechanical interlocking design to ensure the bonding force with hard plastic; or traditional rubber such as natural rubber or synthetic rubber can be used, which have low cost and good elasticity, but may have slightly poorer aging resistance.

[0041] The first gripping part 100 and the second gripping part 200 can also be made into gripping parts with different softness by using different components of the same material.

[0042] During assembly, a split assembly method is adopted. The second gripping part 200 is pressed into the receiving cavity 110 of the first gripping part 100 by pressure, and fixed by the limiting part.

[0043] To ensure the stability of the assembled pen grip under various usage scenarios, the design of the first limiting part 120 and the second limiting part 210 must fully consider the force distribution. In the interlocking of the first limiting part 120 and the second limiting part 210, the serrated joint surface can provide a uniform stress distribution, avoiding local stress concentration that could lead to material fatigue.

[0044] In practical use, the first grip portion 100 and the second grip portion 200 of the pen grip, after being assembled through the above-described process, not only achieve structural stability but also enhance functionality. The soft rubber protrusions on the thumb and index finger pressing portions provide cushioning for the fingers, reducing fingertip pressure during prolonged writing, while the anti-slip strips on the hard rubber portion enhance operational precision. In the event of an accidental drop, the mechanical interlocking structure effectively absorbs impact energy, preventing interface separation; under prolonged wear and tear, the enlarged mating surface slows down material aging and reduces bonding strength, extending product lifespan. Furthermore, this design allows users to replace the second grip portion 200 with different colors or textures according to their preferences, increasing the product's personalization options.

[0045] This patent specification uses directional terms such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom" to describe various example structural parts and components of this patent. However, the use of these terms is merely for illustrative purposes and is based on the orientation of the examples shown in the accompanying drawings. Since the embodiments disclosed in this patent can be arranged in different orientations, these directional terms are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or the same as the direction of gravity.

[0046] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this patent will not describe the various possible combinations separately.

[0047] Furthermore, various implementations of this patent can be combined in any way, and as long as they do not violate the spirit of this patent, they should also be regarded as the content disclosed in this patent.

Claims

1. A pen grip firmly bonded with double adhesive, characterized in that, It includes a first gripping part and a second gripping part. The first gripping part includes a receiving cavity. The second gripping part can be detachably inserted into the receiving cavity and assembled with the first gripping part, or the second gripping part and the first gripping part can be integrally formed by two-color injection molding. The combined first gripping part and the second gripping part are prevented from falling off by a limiting part.

2. The pen grip according to claim 1, characterized in that, The first gripping part includes a first limiting part, which is disposed on the inner wall of the first gripping part; The second gripping part includes a second limiting part, which is disposed on the outer wall of the second gripping part.

3. The pen grip according to claim 2, characterized in that, After the first gripping part and the second gripping part are combined, the first limiting part and the second limiting part form a mechanical interlock; The mechanical interlocking method is one of the following: concave-convex engagement interlocking, hook anchoring interlocking, wrapping interlocking, and rotary locking interlocking.

4. The pen grip according to claim 3, characterized in that, If the mechanical interlocking method is a concave-convex interlocking, the shape of the mating surface of the first limiting part and the second limiting part is one of the following: sawtooth shape, wave shape, dovetail groove shape, hole shape or barb shape.

5. The pen grip according to claim 1, characterized in that, The first grip portion further includes a thumb pressing hole and an index finger pressing hole, wherein the thumb pressing hole and the index finger pressing hole extend from the outer wall of the first grip portion into the receiving cavity; The outer wall of the first grip portion is provided with thumb anti-slip strips and index finger anti-slip strips around the thumb pressing hole and the index finger pressing hole, respectively, to improve grip comfort.

6. The pen grip according to claim 5, characterized in that, The second grip portion further includes a thumb protrusion and an index finger protrusion, the thumb protrusion and the index finger protrusion protruding from the outer wall of the second grip portion; The protruding sidewalls of the thumb protrusion and the index finger protrusion are respectively provided with thumb protrusion stop strips and index finger protrusion stop strips for limiting positioning.

7. The pen grip according to claim 6, characterized in that, After the first gripping part and the second gripping part are combined, the thumb protrusion protrudes from the thumb pressing hole to form a thumb pressing part, and the index finger protrusion protrudes from the index finger pressing hole to form an index finger pressing part.

8. The pen grip according to claim 1, characterized in that, The first gripping part is made of hard plastic or soft plastic material; The material used to prepare the second gripping part is either hard rubber or soft rubber.

9. The pen grip according to claim 8, characterized in that, The rigid plastic material is one of the following: general-purpose plastics, engineering plastics, fiber-reinforced plastics, thermoplastic elastomers, silicone, or rubber; The soft plastic material is one of the following: general-purpose plastics, engineering plastics, fiber-reinforced plastics, thermoplastic elastomers, silicone, or rubber.

10. A pen, characterized in that, The pen includes a pen barrel and a pen grip as described in any one of claims 1 to 9, which is sleeved on the pen barrel.

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