Tail plug for built-in pen core and pen with the tail plug

Abstract

This application relates to a tail plug for a built-in pen refill and a pen equipped with the tail plug. The main technical solution is a tail plug for a built-in pen refill, comprising an elastic plug body in the shape of a regular pyramid with rounded corners on its side edges. The large end of the elastic plug body is integrally formed with a rounded end cap, which is larger than the size of the elastic plug body. A ventilation hole is formed through the axis of the elastic plug body. This application can reduce damage to the pen refill and pen tip.

Description

Technical Field

[0001] The present application relates to the field of pen accessories, in particular to a tail plug for a built-in pen core and a pen with the tail plug. Background Art

[0002] The nib is the most fragile part of the pen. When the pen falls accidentally, for example, from a table (the height of the table is about 55-65cm), if the nib hits the ground first, it is easy to cause damage to the nib, which will cause the pen core to be scrapped and cause a certain amount of waste. Summary of the Invention

[0003] In order to reduce damage to the pen refill and pen tip, the present application provides a tail plug for a built-in pen refill and a pen with the tail plug.

[0004] The present application provides a tail plug for a built-in pen refill, which adopts the following technical solution:

[0005] A tail plug for a built-in pen core comprises an elastic plug body, which is in the shape of a right prism, with rounded corners on the side edges of the elastic plug body, a circular end integrally formed at the large end of the elastic plug body, the size of the end being larger than that of the elastic plug body, and a ventilation hole penetrating the axis of the elastic plug body.

[0006] By adopting this technical solution, the tip is connected to the end of the pen housing. Therefore, when the pen tip hits the ground first, the impact force is transmitted to the tip through the pen core. The tip has a certain degree of elasticity, which can improve the cushioning effect and reduce damage to the pen tip. At the same time, during the writing process, the cushioning effect of the tip can reduce the reaction force when writing, thereby reducing finger fatigue and pen tip wear.

[0007] Secondly, the shape of the elastic plug body is not only conducive to the installation of the elastic plug body, but also has a slight ventilation gap between the side of the elastic plug body and the pen core port. The ventilation gap and the vent hole are combined to balance the air pressure inside and outside the pen core, so as to facilitate smooth ink discharge.

[0008] Optionally, a plurality of buffer grooves are provided on the end surface of the end head facing the elastic plug body, the buffer grooves extend radially along the end head, and the buffer grooves are evenly arranged along the circumference of the end head.

[0009] By adopting the above technical solution and setting up a buffer groove, two-level buffering can be achieved, that is, the port of the pen core first contacts the end face of the end tip, which is the first-level buffering, and then contacts the bottom of the buffer groove, which is the second-level buffering. Multi-level buffering can effectively improve the buffering effect to reduce damage to the pen tip.

[0010] The present application also provides a pen, which adopts the following technical solution:

[0011] A pen comprises a pen core, a pen shell and a tail plug, wherein the pen core is installed in the pen shell, the elastic plug body is elastically embedded in the end port of the pen core, and the end face of the end head abuts against the end face of the pen core end port.

[0012] Optionally, the pen core is slidingly connected to the pen case along the axis of the pen case, a counterweight ring is provided at the gripping part of the pen case, the counterweight ring is coaxially arranged with the pen case, the tail end of the pen case is detachably connected to an end cap, and the end cap is provided with a gravity-controlled limiting structure. When the angle between the axis of the pen case and the vertical line is 0-30 degrees, the gravity-controlled limiting structure has no limit effect on the tail plug. When the angle between the axis of the pen case and the vertical line is 30-90 degrees, the gravity-controlled limiting structure has the effect of limiting the displacement of the tail plug away from the front end of the pen case.

[0013] By adopting the above technical solution, when the angle between the axis of the pen housing and the vertical line is 30-90 degrees, that is, the pen housing is in a state where the user is holding and writing, the pen housing is tilted significantly, and the gravity-controlled limiting structure is triggered. The gravity-controlled limiting structure limits the displacement of the tail plug away from the front end of the pen housing, that is, limits the position of the pen core, so that the pen tip of the pen core is exposed outside the pen housing, which is convenient for writing.

[0014] When the pen falls accidentally and the pen tip is located below the pen tail, the pen case will quickly adjust to a nearly vertical posture under the action of the gravity of the counterweight ring, that is, the angle between the axis of the pen case and the vertical line is 0-30 degrees. At this time, the gravity-controlled limiting structure has no unlimited effect on the tail plug, and the pen core can slide freely relative to the axis of the pen case. At this time, when the pen tip touches the ground, the pen core will immediately retract into the pen case due to the impact force, and continue to touch the ground with the head of the pen case. At this time, during the retraction of the pen core, the tail plug abuts against the end cap, and the elasticity of the tail plug is used to further buffer the displacement force of the pen core, thereby reducing further damage to the pen core.

[0015] And the weight ring is located at the grip position of the pen case to maintain the writing feel.

[0016] Optionally, a limiting cylinder is fixed on the end face of the end cap, and the limiting cylinder is used for the tail end of the pen core to slide and extend into, and the pen core is connected to the pen shell for rotation prevention; the gravity control limiting structure includes a plurality of rocker arms evenly arranged around the circumference of the tail plug axis, the rocker arms are made of plastic, one end of the rocker arms is hingedly connected to the inner circumferential wall of the end cap, and a counterweight is fixed to the other end of the rocker arms, the end face of the counterweight is set as an outward convex arc surface and the curvature center of the outward convex arc surface is located on the hinge axis of the rocker arm, the outer edge of the end head is wrapped with a steel edging, and the edging is provided with an annular chamfer, and the chamfer surface There is an inwardly concave arc surface corresponding to the counterweight block, the center of curvature of the inwardly concave arc surface is located on the hinge axis of the rocker arm, and the inwardly concave arc surface cooperates with the outwardly convex arc surface; when the angle between the axis of the pen housing and the vertical line is 0-30 degrees, the counterweight block of the rocker arm has no contact with the edging; when the angle between the axis of the pen housing and the vertical line is 30-90 degrees, under the action of gravity, the counterweight block swings to the edging, the outwardly convex arc surface of the counterweight block fits with the inwardly concave arc surface of the edging, and the middle part of the rocker arm abuts against the edge of the barrel mouth of the limiting barrel.

[0017] By adopting the above technical solution, when the angle between the axis of the pen case and the vertical line is 0-30 degrees, under the action of the gravity of the counterweight block, the rocker arm swings to a nearly vertical state, the rocker arm is separated from the edge, the tail plug has no limit, and the pen core is in a free sliding state.

[0018] When the angle between the axis of the pen shell and the vertical line is 30-90 degrees, under the action of gravity, the counterweight block swings to the edging, the convex arc surface of the counterweight block fits with the concave arc surface of the edging, and the middle part of the rocker arm abuts against the edge of the tube mouth of the limiting tube. At this time, the rocker arm limits the slippage of the pen core to ensure the normal writing use of the pen core. In addition, the end of the tail plug has a certain elastic buffering effect, thereby improving the writing experience.

[0019] Furthermore, by providing a plurality of rocker arms, even if the holding position of the pen changes circumferentially, there will always be a portion of the rocker arms that will deflect to a limited position under the action of gravity, thereby ensuring the stability of the limiting effect on the tail plug.

[0020] Optionally, a claw is bent and formed at the edge of the edging, and the claw is embedded in the buffer groove. The edging squeezes the end head, and a buffer protrusion is integrally formed on the end face of the end head.

[0021] By adopting the above technical solution and providing the buffering protrusion, it can be ensured that when the pen core is retracted into the limiting cylinder under the action of impact force, the buffering protrusion abuts against the bottom of the limiting cylinder to buffer the impact force.

[0022] In addition, the clamping claws are used to improve the installation stability of the edging.

[0023] Optionally, the end face of the end head is extended in the direction toward the end cover to form an elastic tube, the elastic tube is located in the limiting tube, the tube mouth of the elastic tube is folded outward to form a friction flange, and the friction flange abuts against the inner wall of the tube mouth of the limiting tube; the end cover is connected to a push rod along its own axial sliding, and the push rod is used to push the tail plug.

[0024] By adopting the above technical solution, when the pen refill is retracted into the retaining barrel under the action of impact force, the friction flange and the inner wall of the retaining barrel move relative to each other, generating frictional heat to dissipate the kinetic energy of the pen refill's impact. Furthermore, the engagement of the friction flange with the inner wall of the retaining barrel can limit the position of the pen refill, preventing further movement and ensuring safe accommodation of the pen refill. Finally, the push rod is used to push the pen refill out of the retaining barrel, exposing the pen tip and ensuring normal writing.

[0025] Optionally, the outer circumferential surface of the elastic plug body is integrally formed with self-tapping threads, the end cap is threadedly connected to the tail end of the pen shell, and a limit plate is provided between two adjacent concave arc surfaces, and the limit plate limits the counterweight block from detaching from the end head along the circumferential direction of the tail plug; when the end cap is screwed in, the torque of the end cap is transmitted to the tail plug through the rocker arm, and the axial movement force of the end cap is transmitted to the tail plug through the rocker arm to force the tail plug to penetrate into the interior of the pen core.

[0026] By adopting the above technical solution, for pen refills of different lengths, thicknesses and thicknesses, an elastic plug body with self-tapping threads can be selected for adaptive adjustment and installation.

[0027] First, insert the elastic plug into the port of the pen core, then tilt the pen shell and keep the tilted state of the pen shell, so that the counterweight on the rocker arm contacts the edging first, and then screw in the end cap, and the torque of the end cap is transmitted to the tail plug through the rocker arm (the limit plate is used to prevent the counterweight from circumferentially separating from the edging, and under the premise that the tilted state of the pen shell remains unchanged, each rocker arm is sequentially engaged with the edging to prevent rotation according to the state of the end cap), the elastic plug rotates, and the elastic plug is gradually embedded in the interior of the pen core by utilizing the cooperation of the self-tapping thread and the pen core port, and in this process, the end cap also moves along the axial direction of the pen shell toward the pen tip, and the end cap is rotated. The axial movement force will also be applied to the elastic plug body, further forcing the elastic plug body to embed into the inside of the pen core. During this period, the screw-in speed and tightening distance of the end cap remain constant, but the elastic deformation resistance of the elastic plug body increases, and the screw-in distance of the elastic plug body gradually becomes smaller, thereby forming a stroke difference. The rocker arm gradually swings to a state of abutting against the mouth of the limit cylinder, which ensures that the rocker arm is in the final positioning state, and simultaneously completes the final determination of the relative position between the elastic plug body and the pen core, which realizes high-precision assembly of the pen core and the tail plug, thereby ensuring that pen cores of different lengths and thicknesses can maintain a normal writing position.

[0028] In addition, during the assembly process, the cooperation between the counterweight block and the edging of the rocker arm is used to transmit torque. Therefore, after the assembly is completed, the cooperation between the counterweight block and the edging of the rocker arm is also in the final state. The cooperation accuracy is extremely high, thereby ensuring the smoothness of the rocker arm state switching.

[0029] Optionally, the pen case is provided with a notch at the base of the hand, and a swing tube is provided at the notch, the axis of the swing tube is parallel to the axis of the pen case, the swing tube is eccentrically connected to the pen case, and the rotation axis is parallel to the axis of the pen case; a return spring is provided between the swing tube and the pen case for forcing the swing tube to move coaxially with the pen case, the upper end of the upper traction rope passes around the first guide rod provided on the inner wall of the pen case, and the upper end of the upper traction rope is fixedly connected to the end of the pen core; a lower traction rope is provided at the lower end of the swing tube, the lower end of the lower traction rope passes around the second guide rod provided on the inner wall of the pen case, and the lower end of the lower traction rope is fixedly connected to the middle of the pen core; when the swing tube swings in a direction away from the axis of the pen case, the upper traction rope is tightened, and the upper traction rope drives the pen core to slide downward, and the counterweight block can cooperate with the edging; when the swing tube swings in a direction close to the axis of the pen case, the lower traction rope is tightened, and the lower traction rope drives the pen core to slide upward.

[0030] By adopting the above technical solution, during normal writing, the base of the hand abuts against the swinging tube, forcing the swinging tube to rotate eccentrically at a certain angle relative to the pen case. At this time, the return spring is stretched, the upper traction rope is tightened, the upper end of the upper traction rope moves downward, and the lower end of the lower traction rope moves downward, thereby driving the pen core to move downward, so that the pen tip of the pen core is exposed from the pen case, so as to facilitate writing. Moreover, when the pen core moves down to the extreme position, the tail plug moves to the corresponding position accordingly. At this time, the counterweight block moves to the edging under the action of gravity, and the counterweight block cooperates with the edging to limit the tail plug. At this time, the base of the hand removes the abutting force on the swinging tube, thereby keeping the pen tip of the pen core in an exposed state, so as to facilitate writing.

[0031] If the pen is accidentally dropped, the counterweight ring deflects the pen housing to a near-vertical position. The weight of the counterweight, whose component is greater than the friction between the counterweight and the rim, causes the counterweight to detach from the rim, and the swing arm swings to a near-vertical position. At this point, the tail plug is free to slide, and the pen refill is free to slide. The return spring releases its elastic force, forcing the swing tube to shift back to its original position. The lower traction rope tightens, the lower end of the lower traction rope moves upward, and the upper end of the upper traction rope moves upward, driving the pen refill upward, causing the pen refill's tip to retract into the pen housing, preventing it from directly touching the ground and enhancing safety. Furthermore, the tail plug contacts the bottom of the stopper barrel, and the vibration force of the pen housing is applied to the pen refill through the tail plug's buffering, reducing vibration damage to the pen refill.

[0032] Optionally, the counterweight block is provided with a needle roller, and the needle roller is in rolling engagement with the concave arc surface of the edging.

[0033] By adopting the above technical solution and setting a rolling fit, the friction between the counterweight block and the edging is reduced, thereby improving the smoothness of the fit.

[0034] In summary, this application includes at least one of the following beneficial technical effects:

[0035] 1. By providing an elastic plug and a tip, when the pen tip hits the ground first, the impact force is transferred to the tip through the pen core. The tip's cushioning effect reduces damage to the pen tip. Furthermore, during writing, the tip's cushioning effect mitigates the reaction force, reducing finger fatigue and pen tip wear.

[0036] 2. By setting up a gravity-controlled limit structure, the tail plug can be limited or released according to the different usage status of the pen, so as to take into account the normal writing use of the pen core and the retraction avoidance and buffering of the pen core during the drop process, further reducing the damage of the pen core;

[0037] 3. By utilizing the self-tapping thread and the refill port, and the torque and axial force of the end cap, the elastic plug is further forced to embed into the refill, ensuring that the swing arm is in its final position. The relative position between the elastic plug and the refill is also simultaneously determined, thus achieving high-precision assembly of the refill and the end plug, ensuring that refills of different lengths and thicknesses can maintain their normal writing position.

[0038] 4. By setting a swing tube to control the extension and retraction of the pen core, it can meet the needs of normal writing and retraction of the pen core in case of accident, which is safer and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Schematic diagram of the tail plug of Example 1.

[0040] Figure 2 This is a partial cross-sectional view of the pen of Example 1.

[0041] Figure 3 It is a cross-sectional view of the pen of Example 2 in a vertical state.

[0042] Figure 4 It is a schematic diagram of the tail plug of Example 2.

[0043] Figure 5 It is a partial cross-sectional view of the pen of Example 2 in a tilted state.

[0044] Figure 6 It is a partial cross-sectional view of the pen of Example 3 in a vertical state.

[0045] Figure 7 It is a schematic diagram of the tail plug of Example 4.

[0046] Figure 8 It is a partial cross-sectional view of Example 5, which is used to reflect the matching relationship between the counterweight block and the edging.

[0047] Figure 9 This is a partial schematic diagram of Example 5, showing that the oscillating tube is in an eccentric state and the pen core and pen tip are exposed.

[0048] Figure 10 This is a partial schematic diagram of Example 5, which is used to illustrate that the swing tube is in an eccentric state and the upper traction rope drives the pen core to move downward.

[0049] Figure 11 This is a partial schematic diagram of Example 5, which is used to reflect that the swing tube is in an eccentric state and the lower traction rope is relaxed and allowed to drive the pen core to move downward.

[0050] Explanation of Reference Numerals: 1. Tail plug; 2. Pen core; 3. Pen case; 5. End cap; 6. Gravity-controlled limiting structure; 11. Elastic plug body; 12. End cap; 121. Buffer groove; 13. Vent hole; 14. Buffer protrusion; 15. Edge; 151. Clamping claw; 152. Concave arc surface; 16. Elastic cylinder; 161. Friction flange; 17. Self-tapping thread; 18. Limiting plate; 21. Ring; 211. Through groove; 31. Vertical plate; 32. Counterweight ring; 33. Sliding sleeve; 34. Upper tube; 35. Lower tube; 36. Swing tube; 361. Rotating sleeve; 51. Limiting cylinder; 52. Push rod; 61. Rocker arm; 62. Counterweight; 621. Outer convex surface; 63. Needle roller; 71. Return spring; 72. Upper ear plate; 73. First guide rod; 74. Upper traction rope; 75. Lower ear plate; 76. Second guide rod; 77. Lower traction rope. DETAILED DESCRIPTION

[0051] The following is combined with Figure 1-11 This application is described in further detail.

[0052] Example 1 of the present application discloses a tail plug for a built-in pen refill.

[0053] Reference Figure 1 The tail plug 1 for the built-in pen core includes an elastic plug body 11, which is in the shape of a regular prism. In this embodiment, the elastic plug body 11 is in the shape of a regular hexagonal prism. The elastic plug body 11 can be made of elastic materials such as thermoplastic elastic plastic, rubber or silicone. At the same time, the material hardness can be 10 degrees to 100 degrees Shore.

[0054] In addition, the side edges of the elastic plug body 11 are provided with rounded corners to facilitate the small end of the elastic plug body 11 to be inserted into the end of the pen core 2.

[0055] A vent hole 13 is provided through the axis of the elastic plug body 11, and a plurality of annular protrusions are integrally formed in the vent hole 13 to balance the internal and external air pressures of the inner cavity of the pen core 2 and facilitate ink discharge. Moreover, after installation, a fine vent gap is formed between the side of the elastic plug body 11 and the end of the pen core 2, and the vent gap can be combined with the vent hole 13 to facilitate ink discharge.

[0056] The large end of the elastic plug body 11 is integrally formed with a circular end head 12. The size of the end head 12 is larger than that of the elastic plug body 11, and the thickness of the end head 12 can be set to between 0.5mm and 5mm according to the different hardness of the tail plug.

[0057] The end face of the end head 12 can be an entire plane. In this embodiment, a buffer groove 121 is provided on the end face of the end head 12. There are multiple buffer grooves 121. The buffer grooves 121 extend radially along the end head 12, and each buffer groove 121 is evenly arranged along the circumference of the end head 12. The shape of the buffer groove 121 can be rectangular, tooth-shaped, etc.

[0058] Example 1 also discloses a pen, such as Figure 2 As shown, it includes a refill 2, a pen case 3 and a tail plug 1. The refill 2 is installed in the pen case 3. The elastic plug body 11 is elastically embedded at the end of the refill 2. One end face of the end head 12 abuts against the end face of the refill 2, and the other end face of the end head 12 abuts against the tail of the pen case 3, thereby keeping the position of the refill 2 stable.

[0059] When the pen is accidentally dropped and the pen tip hits the ground first, the impact force will be transmitted to the end 12 through the pen core 2. The end 12 has a certain degree of elasticity, which can improve the cushioning effect and reduce damage to the pen tip. At the same time, during the writing process, the cushioning effect of the tail plug 1 can reduce the reaction force when writing, thereby reducing finger fatigue and pen tip wear.

[0060] Example 2

[0061] The difference between Example 2 and Example 1 is that Figure 3 As shown, the refill 2 and the pen housing 3 are connected to each other in a sliding and rotation-proof manner along the axis of the pen housing 3. Specifically, a sliding sleeve 33 is coaxially fixed to the inner wall of the pen housing 3. The sliding sleeve 33 is sleeved on the outer side of the refill 2. The refill 2 can slide relative to the sliding sleeve 33. In addition, a vertical plate 31 is fixed to the head end of the pen housing 3. The vertical plate 31 is located in the longitudinal section of the pen housing 3. A circular ring 21 is fixed to the front end of the refill 2. A through groove 211 is opened at the edge of the circular ring 21. The vertical plate 31 cooperates with the through groove 211 to prevent the refill 2 from rotating relative to the pen housing 3.

[0062] A weight ring 32 is fixed to the gripping position of the pen housing 3. The cross section of the weight ring 32 is trapezoidal. When the pen falls from the air, the weight ring 32 adjusts the posture of the pen housing 3 to a nearly vertical state under the action of gravity.

[0063] like Figure 3 As shown, the tail end of the pen shell 3 is detachably connected to the end cap 5. Specifically, the cross section of the end cap 5 is a regular nine-sided shape. The end cap 5 is threadedly connected to the tail end of the pen shell 3, that is, the axial position between the end cap 5 and the pen shell 3 can be adjusted, and the inner end surface of the end cap 5 is fixed with a limiting cylinder 51. The limiting cylinder 51 is coaxially arranged with the end cap 5. The inner diameter of the limiting cylinder 51 is larger than the outer diameter of the end head 12. The limiting cylinder 51 is used for the tail end of the pen core 2 to slide into, that is, for the tail plug 1 to slide into.

[0064] like Figure 4 As shown, the outer edge of the end 12 is wrapped with a steel edging 15, and the edging 15 is provided with an annular chamfer, and the edge of the edging 15 is bent to form a claw 151, and the claw 151 is embedded in the buffer groove 121. The edging 15 squeezes the end 12, thereby completing the fixed connection between the edging 15 and the end 12, and the end surface of the end 12 away from the pen core 2 is integrally formed with a buffer protrusion 14, and the buffer protrusion 14 is annular.

[0065] like Figure 3 、 Figure 5 As shown, the end cover 5 is provided with a gravity control limit structure 6, specifically, the gravity control limit structure 6 includes nine rocker arms 61 evenly arranged around the axis of the tail plug 1, the rocker arms 61 are made of plastic, one end of the rocker arms 61 is hingedly connected to the inner wall of the end cover 5, and a counterweight block 62 is fixed to the other end of the rocker arms 61, and the end face of the counterweight block 62 is set as an outward convex arc surface 621 and the center of curvature of the outward convex arc surface 621 is located on the hinge axis of the rocker arms 61.

[0066] like Figure 4 、 Figure 5 As shown, a plurality of concave arc surfaces 152 are provided on the chamfered surface of the edging 15, and each concave arc surface 152 is arranged in a one-to-one correspondence with the convex arc surface 621 of each counterweight block 62, and the concave arc surface 152 of the edging 15 and the convex arc surface 621 of the counterweight block 62 are both polished, and the center of curvature of the concave arc surface 152 is located on the hinge axis of the rocker arm 61, and the concave arc surface 152 is matched with the convex arc surface 621.

[0067] When the pen case 3 is in the state of being held and written by the user, the pen case 3 is tilted significantly. At this time, the angle between the axis of the pen case 3 and the vertical line is 30-90 degrees. Under the action of gravity, the counterweight 62 drives the rocker arm 61 to swing, and the counterweight 62 swings to the edge 15. The convex arc surface 621 of the counterweight 62 fits with the concave arc surface 152 of the edge 15, and the middle part of the rocker arm 61 abuts against the outer edge of the tube mouth of the limiting cylinder 51, that is, the tube mouth of the limiting cylinder 51 restricts the rocker arm 61 from continuing to swing. At this time, the rocker arm 61 restricts the sliding of the pen core 2 to ensure that the pen tip of the pen core 2 is stably exposed to the pen case 3, so as to ensure the normal writing use of the pen core 2. In addition, during the writing process, the writing impact force will be applied to the tail plug 1 through the pen core 2, and the tail plug 1 has a certain elastic buffering effect, thereby improving the writing experience.

[0068] When the pen falls accidentally and the pen tip is located below the pen tail, the pen case 3 will be quickly adjusted to a nearly vertical posture under the action of the gravity of the counterweight ring 32, that is, the angle between the axis of the pen case 3 and the vertical line is 0-30 degrees. Under the action of the gravity of the counterweight block 62, the rocker arm 61 swings to a nearly vertical state, the rocker arm 61 is separated from the edge 15, the tail plug 1 has no limit, and the pen core 2 is in a free sliding state. At this time, when the pen tip touches the ground, the pen core 2 receives the impact force and immediately retracts into the inside of the pen case 3, and the head of the pen case 3 continues to touch the ground. At this time, during the retraction of the pen core 2, the tail plug 1 extends into the limiting cylinder 51, and the buffering protrusion 14 on the tail plug 1 abuts against the bottom of the limiting cylinder 51. The buffering effect of the buffering protrusion 14 is used to further buffer the displacement force of the pen core 2, thereby reducing further damage to the pen core 2.

[0069] Example 3

[0070] The difference between Example 3 and Example 2 is that Figure 6 As shown, the end face of the end head 12 is extended toward the end cover 5 to form an elastic tube 16, and the elastic tube 16 is coaxially arranged with the end head 12. The tube mouth of the elastic tube 16 is folded outward to form a friction flange 161, and the friction flange 161 abuts against the inner wall of the tube mouth of the limiting tube 51.

[0071] In addition, the end cover 5 is connected to a push rod 52 for sliding movement along its own axial direction.

[0072] The pen core 2 is in a freely sliding state, and when the pen tip touches the ground, under the action of the impact force, the tail plug 1 will retract into the limiting cylinder 51, and the friction flange 161 and the inner wall of the limiting cylinder 51 will move relative to each other, generating friction heat to consume the impact kinetic energy of the pen core 2, thereby reducing damage to the pen core 2.

[0073] Moreover, after the tail plug 1 is displaced into the limiting cylinder 51, the elastic cylinder 16 abuts against the bottom of the limiting cylinder 51, and the friction flange 161 is engaged with the inner wall of the limiting cylinder 51, thereby limiting the position of the pen core 2 to prevent the pen core 2 from rebounding and displacing due to the impact force.

[0074] When writing is required, the push rod 52 can be used to push the tail plug 1 away from the limiting tube 51 so that the pen tip is exposed to ensure subsequent normal writing.

[0075] Example 4

[0076] The difference between Example 4 and Example 2 is that Figure 7 As shown, a limit plate 18 is provided between two adjacent concave arc surfaces 152. The limit plate 18 limits the counterweight 62 from circumferentially separating from the end head 12 along the tail plug 1. Due to the circumferential limitation of the limit plate 18, during the rotation of the end cap 5, the torque of the end cap 5 is transmitted to the tail plug 1 through the rocker arm 61, thereby forcing the tail plug 1 to rotate relative to the pen core 2.

[0077] The outer peripheral surface of the elastic plug body 11 is integrally formed with a self-tapping thread 17 .

[0078] This embodiment is mainly aimed at the positioning and installation of refills 2 of different lengths, thicknesses, to ensure that the refills 2 are in the correct installation position, the tail plug 1 and the refill 2 are in the correct installation position, and the rocker 61 and the rocker 61 are in the correct installation position. The specific analysis is as follows:

[0079] First, insert the elastic plug 11 into the port of the refill 2, put the refill 2 into the pen case 3, with the pen tip of the refill 2 exposed, then buckle the end cap 5 to preliminarily tighten it, then tilt the pen case 3 and keep the tilted state of the pen case 3, so that the convex arc surface 621 of the counterweight 62 on the rocker 61 contacts the concave arc surface 152 of the edging 15 first, then slowly screw in the end cap 5 (the direction of screwing in the end cap 5 is towards the pen tip), and the torque of the end cap 5 is transmitted to the tail plug 1 through the rocker 61, and before the tilted state of the pen case 3 remains unchanged, As the end cap 5 rotates, each rocker 61 swings downward in turn and cooperates with the edging 15. At this time, the elastic plug 11 rotates, and the elastic plug 11 will gradually be embedded in the interior of the refill 2 by utilizing the cooperation between the self-tapping thread 17 and the port of the refill 2. In this process, the screwed-in end cap 5 moves axially along the pen shell 3 toward the pen tip, and the axial movement force of the end cap 5 will also be applied to the elastic plug 11, further forcing the elastic plug 11 to be embedded in the interior of the refill 2, so that the elastic plug 11 can be stably embedded according to the refills 2 of different thicknesses.

[0080] During the screwing-in process of the end cap 5, the screwing-in speed and the tightening distance of the end cap 5 remain constant, and the elastic plug body 11 has an increased elastic deformation resistance as its embedding depth increases, so the screwing-in distance of the elastic plug body 11 gradually becomes smaller, so a stroke difference is formed between the end cap 5 and the elastic plug body 11, so the rocker arm 61 gradually swings relative to the elastic plug body 11 to a state where its middle part abuts against the tube mouth of the limiting tube 51, and this state is the final state when the rocker arm 61 cooperates with the edging 15. In this way, the final determination of the relative position between the elastic plug body 11 and the pen core 2 is also completed synchronously, and the relative position between the end cap 5 and the pen core 2 is also finalized, that is, the pen cores 2 of different lengths can also be stably installed in the pen case 3, thereby realizing high-precision installation of the pen core 2, and then ensuring that the pen cores 2 of different lengths and thicknesses can maintain a normal writing position.

[0081] Secondly, during the assembly process, the cooperation between the counterweight 62 of the rocker arm 61 and the edging 15 is used as the transmission of torque. Therefore, after the assembly is completed, the cooperation between the counterweight 62 of the rocker arm 61 and the edging 15 is in a stable final state. Therefore, in the subsequent process of the rocker arm 61 swinging under gravity, the convex arc surface 621 of the counterweight 62 thereon can be accurately moved to the concave arc surface 152 of the edging 15 for high-precision cooperation, thereby ensuring the limit accuracy.

[0082] Example 5

[0083] The difference between Example 5 and Example 2 is that Figure 8 As shown, the counterweight 62 is provided with a needle roller 63, which is an elliptical cylinder. The curvature radius of the rolling surface of the needle roller 63 is smaller than the curvature radius of the convex arc surface 621; the needle roller 63 is used to roll with the concave arc surface 152 of the edging 15.

[0084] like Figure 9 As shown, the pen housing 3 is provided with a notch at the base of the hand, which separates the pen housing 3 into an upper tube 34 and a lower tube 35. The upper tube 34 and the lower tube 35 are fixedly connected by a connecting rod (not shown in the figure). The connecting rod is parallel to the axis of the pen housing 3. At the same time, a swing tube 36 is provided at the notch. The axis of the swing tube 36 is parallel to the axis of the pen housing 3. A rotating sleeve 361 is fixed to the side wall of the swing tube 36. The rotating sleeve 361 is sleeved on the connecting rod, so that the swing tube 36 is eccentrically rotatably connected to the pen housing 3.

[0085] like Figure 10 、 Figure 11As shown, a return spring 71 is fixed between the swing tube 36 and the pen housing 3. Specifically, there are two return springs 71, the upper end and lower end of one return spring 71 are fixedly connected to the lower part of the upper tube 34 and the upper part of the swing tube 36 respectively, and the upper end and lower end of the other return spring 71 are fixedly connected to the lower part of the swing tube 36 and the upper part of the lower tube 35 respectively. The elastic force of the return spring 71 can force the swing tube 36 to move coaxial with the pen housing 3.

[0086] An upper ear plate 72 is fixed to the portion of the refill 2 located inside the upper tube 34, and a lower ear plate 75 is fixed to the portion of the refill 2 located inside the lower tube 35. A first guide rod 73 is fixed to the lower portion of the upper tube 34, and the first guide rod 73 is arranged radially along the upper tube 34. The first guide rod 73 and the upper ear plate 72 are located in the same longitudinal section. A second guide rod 76 is fixed to the upper portion of the lower tube 35, and the second guide rod 76 is staggered with the first guide rod 73. The second guide rod 76 is arranged radially along the lower tube 35, and the second guide rod 76 and the lower ear plate 75 are located in the same longitudinal section.

[0087] An upper traction rope 74 is fixed to the upper end of the swing tube 36, and the upper end of the upper traction rope 74 passes around the first guide rod 73 and is fixedly connected to the upper ear plate 72. A lower traction rope 77 is fixed to the lower end of the swing tube 36, and the lower end of the lower traction rope 77 passes around the second guide rod 76 and is fixedly connected to the lower ear plate 75.

[0088] During normal writing, the base of the hand abuts against the swing tube 36 (specifically, the area near the third joint of the index finger abuts against the swing tube 36), forcing the swing tube 36 to rotate eccentrically relative to the pen housing 3 by a certain angle (the swing direction of the swing tube 36 is toward the side of the second guide rod 76 and also away from the side of the first guide rod 73). At this time, the return spring 71 is stretched, the lower end of the upper traction rope 74 is tightened by the traction of the swing tube 36, and the upper end of the upper traction rope 74 moves downward. At the same time, the upper end of the lower traction rope 77 is pulled by the traction of the swing tube 36 and loosened, allowing the lower traction rope 77 to be lowered. The lower end of the rope 77 moves downward, thereby driving the pen core 2 to move downward, so that the pen tip of the pen core 2 is exposed from the pen shell 3, so as to facilitate writing. Moreover, when the pen core 2 moves down to the lowest point, the tail plug 1 also moves to the corresponding position. At this time, the counterweight block 62 moves to the edge 15 under the action of gravity. The counterweight block 62 cooperates with the edge 15 to limit the tail plug 1, thereby limiting the position of the pen core 2. At this time, the hand's base of the hand removes the abutment force on the swing tube 36, and there is no need to continuously apply a tightening force, thereby keeping the pen tip of the pen core 2 in an exposed state, so as to facilitate writing.

[0089] When the pen is accidentally dropped, the pen case 3 deflects to a nearly vertical state under the action of the counterweight ring 32. Under the action of the gravity of the counterweight 62, and the component force of the gravity of the counterweight 62 is greater than the friction between the counterweight 62 and the edge 15, the counterweight 62 is separated from the edge 15, and the rocker arm 61 also swings to a nearly vertical state. At this time, the pen core 2 is in a free sliding state, and then the return spring 71 releases its elastic force, forcing the rocker tube 36 to deflect and reset (the rocker tube 36 swings toward the side of the first guide rod 73 and away from the side of the second guide rod 76). The upper end of the lower traction rope 77 is pulled tight by the rocker tube 36, the lower end of the lower traction rope 77 moves upward, and the lower end of the upper traction rope 74 is pulled by the rocker tube 36 and loosened, allowing the upper end of the upper traction rope 74 to move upward, thereby driving the pen core 2 to move upward, so that the pen tip of the pen core 2 is retracted into the pen case 3, so as to prevent the pen tip from directly touching the ground, which is safer.

[0090] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A pen, characterized in that: The invention comprises a pen core (2), a pen shell (3) and a tail plug (1), wherein the tail plug (1) comprises an elastic plug body (11), wherein the elastic plug body (11) is in the shape of a regular prism, wherein the side edges of the elastic plug body (11) are provided with rounded corners, wherein the large end of the elastic plug body (11) is integrally formed with a round end head (12), wherein the size of the end head (12) is larger than the size of the elastic plug body (11), wherein an air vent (13) is provided through the axis of the elastic plug body (11), wherein the end face of the end head (12) facing the elastic plug body (11) is provided with a plurality of buffer grooves (121), wherein the buffer grooves (121) extend radially along the end head (12), and wherein the buffer grooves (121) are evenly arranged along the circumference of the end head (12); The pen core (2) is installed in the pen case (3), the elastic plug body (11) is elastically embedded in the port of the pen core (2), and the end face of the end head (12) abuts against the end face of the port of the pen core (2); the pen core (2) and the pen case (3) are slidably connected along the axis of the pen case (3), the gripping portion of the pen case (3) is provided with a counterweight ring (32), the counterweight ring (32) and the pen case (3) are coaxially arranged, the tail end of the pen case (3) is detachably connected with an end cap (5), the end cap (5) is provided with a gravity control limiting structure (6), when the angle between the axis of the pen case (3) and the vertical line is 0-30 degrees, the gravity control limiting structure (6) has unlimited action on the tail plug (1) When the angle between the axis of the pen housing (3) and the vertical line is 30-90 degrees, the gravity control limiting structure (6) has the effect of limiting the displacement of the tail plug (1) away from the front end of the pen housing (3); the end surface of the end cover (5) is fixed with a limiting cylinder (51), the limiting cylinder (51) is used for the tail end of the pen core (2) to slide into, and the pen core (2) is connected to the pen housing (3) in a rotation-proof manner; the gravity control limiting structure (6) includes a plurality of swing rods (61) uniformly arranged around the axis of the tail plug (1), the swing rods (61) are made of plastic, one end of the swing rods (61) is hingedly connected to the inner peripheral wall of the end cover (5), and the other end of the swing rods (61) is fixed with a counterweight block (62), the end face of the counterweight (62) is set as an outward convex arc surface (621) and the center of curvature of the outward convex arc surface (621) is located on the hinge axis of the swing rod (61), the outer edge of the end head (12) is wrapped with a steel edging (15), the edging (15) is provided with an annular chamfer, and the chamfered surface is provided with an inward concave arc surface (152) corresponding to the counterweight (62), the center of curvature of the inward concave arc surface (152) is located on the hinge axis of the swing rod (61), and the inward concave arc surface (152) matches the outward convex arc surface (621); when the angle between the axis of the pen housing (3) and the vertical line is 0-30 degrees, the counterweight (62) of the swing rod (61) has no contact with the edging (15);When the angle between the axis of the pen housing (3) and the vertical line is 30-90 degrees, under the action of gravity, the counterweight (62) swings to the edge (15), the outer convex arc surface (621) of the counterweight (62) fits with the inner concave arc surface (152) of the edge (15), and the middle of the swing rod (61) abuts against the edge of the tube mouth of the limiting tube (51).

2. The pen according to claim 1, characterized in that: A claw (151) is formed by bending at the edge of the edging (15), and the claw (151) is embedded in the buffer groove (121). The edging (15) squeezes the end head (12), and a buffer protrusion (14) is integrally formed on the end face of the end head (12).

3. The pen according to claim 1, characterized in that: An elastic tube (16) is formed on the end surface of the end head (12) in a direction extending toward the end cover (5). The elastic tube (16) is located in the limiting tube (51). The tube mouth of the elastic tube (16) is folded outward to form a friction flange (161). The friction flange (161) abuts against the inner wall of the tube mouth of the limiting tube (51). The end cover (5) is connected to a push rod (52) along its own axial sliding direction. The push rod (52) is used to push the tail plug (1).

4. The pen according to claim 2, characterized in that: The outer peripheral surface of the elastic plug body (11) is integrally formed with self-tapping threads (17), the end cover (5) is threadedly connected to the tail end of the pen housing (3), and a limit plate (18) is provided between two adjacent concave arc surfaces (152), and the limit plate (18) limits the counterweight (62) from being separated from the end head (12) along the circumferential direction of the tail plug (1); when the end cover (5) is screwed in, the torque of the end cover (5) is transmitted to the tail plug (1) through the rocker arm (61), and the axial movement force of the end cover (5) is transmitted to the tail plug (1) through the rocker arm (61) to force the tail plug (1) to extend into the interior of the pen core (2).

5. The pen according to claim 2, characterized in that: The pen housing (3) is provided with a notch at the position of the hand's base of the thumb, and a swing tube (36) is provided at the notch. The axis of the swing tube (36) is parallel to the axis of the pen housing (3). The swing tube (36) is eccentrically connected to the pen housing (3) and the axis of rotation is parallel to the axis of the pen housing (3). A return spring (71) is provided between the swing tube (36) and the pen housing (3) for forcing the swing tube (36) to move to be coaxial with the pen housing (3). An upper traction rope (74) is provided at the upper end of the swing tube (36). The upper end of the upper traction rope (74) passes around a first guide rod (73) provided on the inner wall of the pen housing (3), and the upper end of the upper traction rope (74) is fixedly connected to the end of the pen core (2). The lower end of the swing tube (36) is provided with a lower traction rope (77), the lower end of the lower traction rope (77) passes around the second guide rod (76) provided on the inner wall of the pen shell (3), and the lower end of the lower traction rope (77) is fixedly connected to the middle part of the pen core (2); when the swing tube (36) swings in a direction away from the axis of the pen shell (3), the upper traction rope (74) is tightened, and the upper traction rope (74) drives the pen core (2) to slide downward, and the counterweight (62) can cooperate with the edge (15); when the swing tube (36) swings in a direction close to the axis of the pen shell (3), the lower traction rope (77) is tightened, and the lower traction rope (77) drives the pen core (2) to slide upward.

6. The pen according to claim 5, characterized in that: The counterweight block (62) is provided with a needle roller (63), and the needle roller (63) is in rolling engagement with the inner concave arc surface (152) of the edging (15).

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