Pen allowing for gravity-based refill retraction

Abstract

A pen allowing for gravity-based refill retraction, comprising a telescopic writing sleeve barrel, limiting members, and a writing tool body, wherein the writing sleeve barrel comprises a lower sleeve barrel and an upper sleeve barrel which are sleeved with each other; the writing tool body is located in the writing sleeve barrel; by means of telescopic movement of the writing sleeve barrel, the writing tool body can move between two positions, i.e., a refill retraction position and a refill extension position, in the writing sleeve barrel; a temporary clamping state is formed between the lower sleeve barrel and the upper sleeve barrel; the temporary clamping state formed between the lower sleeve barrel and the upper sleeve barrel is limited by means of the limiting members, so that in a writing state, the limiting members, the lower sleeve barrel, and the upper sleeve barrel form a stable fit state, in which case the pen is in a refill extended state; when the limiting members move a certain distance under the effect of gravity, the limiting effect on the clamping state between the lower sleeve barrel and the upper sleeve barrel is lost, the fit state between the lower sleeve barrel and the upper sleeve barrel can be released immediately or after a certain period of time, and the writing sleeve barrel moves to the maximum length state under the effect of a reset member or a reset structure, in which case the pen is in a refill retracted state.

Description

A gravity retractable pen Technical Field

[0001] The invention relates to a pen, in particular to a gravity-retracting pen. Background Art

[0002] The development of pens has a long history, from the earliest bamboo slips and brushes to the fountain pen of the Industrial Revolution and the modern gel pens. The pen's form and function have been continuously improved and expanded. It is a tool for the inheritance of human civilization and has also brought greater convenience and possibilities to people's writing and drawing. Most gel pens on the market today are either push-on or capped. Push-on pens use a press on the tip to release and retract the ink cartridge. This method is convenient to use, but it often makes a loud noise when pressed, which can disrupt a quiet environment. Capped gel pens use a snap-on cap to protect the ink cartridge, but this cap is easy to lose, affecting daily use.

[0003] The pull-up pen is a new type of gel pen that has emerged in recent years. The internal pen core is pulled out and retracted by pulling up the lower sleeve rod that is sleeved inside the upper sleeve rod. This method is convenient and noiseless, and it is not easy to lose internal parts when assembling the lower sleeve rod and the upper sleeve rod. For example, a self-locking pull-up pen disclosed in a Chinese invention patent document rotates the movable outer cylinder or the lower sleeve rod so that the self-locking buckle switches from the sliding straight groove to the self-locking groove to achieve a self-locking effect. However, its self-locking function still requires manual rotation to be realized, and manual release is also required. Therefore, if you forget to retract the pen core due to negligence, the pen core will remain exposed, which may damage the pen core and may also cause the exposed pen core to stain clothes.

[0004] Therefore, we need a pull-up pen that can lock the pen core when in use and automatically retract the core when not in use and is easy to use. Summary of the Invention

[0005] The purpose of the present invention is to provide a gravity refill pen that can achieve the effect of locking the refill when it is ejected and automatically refilling the refill by gravity, and is easy to use. To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A gravity-operated refill pen comprises a retractable writing sleeve, a stopper, and a writing instrument body. The writing sleeve comprises a lower sleeve and an upper sleeve that are interconnected. The writing instrument body is located within the writing sleeve. The retraction of the writing sleeve allows the writing instrument body to change between two positions within the writing sleeve: refilling and releasing the ink. During release, a temporary engagement state is formed between the lower sleeve and the upper sleeve. The stopper limits the temporary engagement state formed between the lower and upper sleeves, thereby forming a stable fit between the stopper, the lower sleeve, and the upper sleeve during writing. This is the refilling state. When the stopper is displaced and / or rotated a certain distance by gravity, losing its limiting effect on the temporary engagement state between the lower and upper sleeves, the temporary fit between the lower and upper sleeves is released immediately or after a certain delay. The resetting member or reset structure then causes the length of the writing sleeve to extend and retract to its maximum, resulting in the refilling state.

[0007] A gravity retractable pen comprises a retractable writing sleeve, a limiting member and a writing tool body. The writing sleeve comprises a lower sleeve and an upper sleeve which are connected to each other. The lower sleeve is axially retractable relative to the upper sleeve. The writing tool body is located inside the writing sleeve. The writing sleeve is provided with a mating end and a matching end. The mating end and the matching end are respectively provided on the lower sleeve and the upper sleeve. The limiting member is provided inside the upper sleeve and can move up and down and / or rotate, and maintains a locked state between the mating end and the matching end by its own gravity. When the pen is retracted, the limiting member is relieved of the limiting or additional gravity influence on the matching end or the matching end by its own gravity, so that the temporary mating state between the mating end and the matching end disappears, and the upper sleeve and the lower sleeve return to the state of the maximum mating distance, thereby achieving retracting the pen.

[0008] Preferably, the writing sleeve rod is further provided with a mating end and a matching end, which are provided on the lower sleeve rod and the upper sleeve rod, respectively. The mating end and the matching end cooperate with each other to form a temporary engagement state, and the lower portion of the stopper is wedged into the side of the mating end near the axis to compress the circumferential deformation of the mating end, thereby better maintaining the engagement state with the upper engagement area of ​​the matching end, thereby achieving the purpose of locking the core.

[0009] Preferably, a gripping slope and a gripping rod are provided between the lower and upper sleeve rods, and the gripping rod is further provided with a gripping boss for squeezing the gripping slope to cause the lower sleeve rod to axially retract into the upper sleeve rod. The gripping slope and gripping rod are provided on either the lower or upper sleeve rod. If the gripping rod is provided on the lower sleeve rod, the gripping slope is provided on the upper sleeve rod, and vice versa. This allows the gravity-touch retractor to be manually gripped by squeezing the gripping boss to move the lower sleeve rod upward, achieving the purpose of manually extruding the core.

[0010] Preferably, the inner wall diameter of the upper sleeve gradually increases from bottom to top to form a trigger slope, which is used to cause the stopper to disengage from the mating end when the pen is placed horizontally, triggering the refill. The trigger slope can engage the outer wall of the stopper when the pen is tilted or placed vertically during use, and the stopper becomes tighter as it moves downward, increasing friction to maintain the refill in the pen.

[0011] Preferably, the limiting member is a strip block, and a pair of strip slots are provided on both sides of the lower sleeve rod corresponding to the limiting member. Alternatively, the limiting member is an annular member sleeved on the outside of the upper sleeve rod.

[0012] A gravity-loaded refill pen comprises a retractable writing sleeve, a stopper, and a writing instrument body. The writing sleeve comprises a lower sleeve and an upper sleeve that are sleeved together. The lower sleeve is axially retractable relative to the upper sleeve. The writing instrument body is located within the writing sleeve. The lower sleeve is provided with a mating end, and the upper sleeve is provided with a matching end. The mating end or the matching end is deformable. The stopper is sleeved on the outside of the connection between the lower sleeve and the upper sleeve, and the side of the stopper closest to the writing end of the writing instrument body contacts the mating end to prevent circumferential deformation of the mating end and maintain an engaged state with the matching end.

[0013] Preferably, a control boss is further provided on the inner side of the limiting member, and the control boss cooperates with the mating end to provide additional control force when the pen is in the core-out state, so that the pen can be used more stably.

[0014] Preferably, an upper sleeve rod is provided with an upper sleeve rod limiting boss for limiting excessive downward movement of the limiting member, and a counterweight limiting boss may also be provided in the limiting member. The upper sleeve rod limiting boss and the counterweight limiting boss cooperate with each other to better limit excessive downward movement of the limiting member, thereby avoiding the limiting member excessively blocking the formation of a temporary mating state between the mating end and the matching end when the core is ejected, reducing the failure rate when the core is ejected, and improving the success rate of the writing operation.

[0015] Preferably, there are two situations in which the position change between the matching end and the mating end occurs:

[0016] When the limiting member does not apply gravity to the mating end, the engaging force formed between the matching end and the mating end is less than the reset force of the reset member. The reset member prompts the mating end to return to the bottom of the matching end, so that the writing tool body is completely retracted into the lower sleeve rod and the upper sleeve rod, which is the core-retracted state.

[0017] When the stopper presses against the mating end, exerting additional gravity and / or a limiting force on the mating end, the sum of the additional gravity, the limiting force, and the engagement force between the mating and mating ends exceeds the return force, forcing the mating end to remain above the mating end, thereby maintaining the writing instrument body exposed from the lower sleeve, which is the ejected state.

[0018] Preferably, a gentle engagement slope is provided on the mating end and the matching end. The engagement force between the mating end and the matching end can be controlled by adjusting the slope of the gentle engagement slope to achieve a suitable engagement effect, thereby avoiding an unstable core ejection state caused by too little engagement force, and difficulty in core collection caused by too much engagement force. At the same time, it can play a guiding role when the matching end undergoes radial inward deformation or circumferential outward deformation.

[0019] Preferably, a limiting slope is provided on the mating end and the limiting member, and the limiting slope controls the limiting force between the mating end and the limiting member by adjusting the slope of the limiting slope, and is used to adjust the limiting member to apply additional gravity and limiting force to the mating end, thereby further adjusting the degree of engagement between the matching end and the mating end.

[0020] Preferably, the upper sleeve rod and / or the lower sleeve rod are detachably connected, and the upper sleeve rod and / or the lower sleeve rod are composed of multiple parts, which is used to facilitate assembly and disassembly and core replacement in actual production.

[0021] Preferably, the limiter can be sleeved on the inside of the upper sleeve rod or the lower sleeve rod or on the outside of the upper sleeve rod or the lower sleeve rod, so as to better adapt to the usage scenarios and requirements of different types of gravity touch pen collection, and at the same time improve the stability of the limiter, making it more reliable.

[0022] Preferably, a multifunctional spring with elasticity is further provided between the limiter and the upper sleeve rod; the multifunctional spring has two different usage modes and parameter requirements according to different actual usage scenarios:

[0023] 1. When the anti-drop function is required, the two ends of the multi-function spring are fixed to the limiter and the upper sleeve rod respectively; the elastic force of the multi-function spring is less than the gravity of the limiter. When the pen is in the writing posture, the multi-function spring is in a stretched state, which can trigger the retraction of the pen when it falls, thereby protecting the writing tool from damage and extending its service life;

[0024] 2. When it is necessary to reduce the weight of the tail of the pen, it is necessary to reduce the gravity of the limiter. In order to prevent the pen from being in an inclined writing state, the downward pressure is insufficient, resulting in the mating end and the matching end being unable to achieve a good and stable temporary mating state. The multi-function spring is located between the limiter and the upper sleeve rod. Under normal circumstances, it is in a slightly compressed state, providing a slight elastic force to the limiter.

[0025] Preferably, the limiter can use steel balls instead of or add steel balls between the limiter and the writing sleeve rod. The limiter is also provided with a movable counterweight or has a weight sufficient to break away from the temporary mating state, which is used to better adjust and control the gravity and limiting force of the limiter so that it can function more stably; the counterweight is used to increase the gravity of the limiter and, when necessary, provide an impact force in the opposite direction of the limiter to help the limiter better break away from the temporary mating state of the mating end and the matching end when needed.

[0026] Preferably, the upper sleeve rod can be split into an upper sleeve rod body and a cover body and / or the lower sleeve rod can be split into a lower sleeve rod body and a replaceable core part to reduce processing difficulty, reduce assembly difficulty, provide a writing tool replacement function, and extend product service life.

[0027] Preferably, the limiting member can be arranged in the writing sleeve rod in the following ways:

[0028] 1. The limiter is movably arranged between the upper sleeve rod and the lower sleeve rod.

[0029] 2. The upper sleeve rod can be separated into an upper sleeve rod body and a cover body, and one end of the limiter is movably fixed to the outer ring of the cover body.

[0030] 3. One end of the limiter is movably fixed to the center of the upper sleeve rod.

[0031] 4. An inner ring groove is provided on the upper sleeve rod, and both ends of the limit piece are provided in the inner ring groove.

[0032] 5. A cross bar is also provided inside the upper sleeve rod, and one end of the limiter is movably fixed on the cross bar.

[0033] 6. The upper sleeve rod can be split into an upper sleeve rod body and a cover body, and the limit piece is located between the upper sleeve rod body and the cover body.

[0034] 7. A limit extension portion is also provided on the lower sleeve rod, and the limit piece is located between the limit extension portion and the upper sleeve rod.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The structure is streamlined, requiring at least three accessories (an upper sleeve rod, a lower sleeve rod, and a limiter; writing tools and a reset member are all required universal parts and are therefore not counted in the number) to complete an excellent core-out / core-in action. The gravity and / or limit of the limiter increase the tightness of the engagement between the mating end and the matching end, thereby maintaining the core-out state. When the limiter is displaced by gravity or external force, the temporary engagement state between the matching end and the matching end is released, and the core-in state is restored.

[0037] 2. It has an anti-fall effect. Through the action of the multi-function spring, it can ensure that the pen core will be retracted when there is no weight.

[0038] 3. Lightweight structure: To address the influence of gravity on the tail, the multi-functional spring can be used to reduce the weight to a certain extent.

[0039] 4. The reel is more sensitive when placed horizontally. By setting a trigger slope that gradually increases from bottom to top or reserving enough space on both sides of the limiter to facilitate the tipping of the limiter, gravity reeling can be achieved when the pen is placed horizontally. When the pen is placed horizontally, the limiter disengages from the mating end to trigger the reel, achieving the effect of automatic reeling.

[0040] 5. The trigger force is adjustable. By setting a gentle engagement slope on the mating end and the matching end, the slope of the gentle engagement slope determines the size of the engagement force between the mating end and the matching end, thereby achieving a suitable engagement effect.

[0041] 6. It is easier to remove the core. By setting a holding boss on the holding rod, the gravity touch pen can be squeezed by the holding boss to move the lower sleeve rod upward when it is held in the hand, so as to achieve the purpose of manually squeezing out the core.

[0042] 7. The trigger is more stable. By adding a movable counterweight inside the limiter, the fault tolerance of the structure can be lowered, and the impact force is increased to release the core, thereby improving the accuracy of the core collection.

[0043] 8. The appearance is changeable. The limiter can be set at the middle part of the writing sleeve rod, at the tail part, at the front part, or at the outside or inside of the writing sleeve rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] FIG1 is a structural schematic diagram (left) and a cross-sectional structural schematic diagram (right) of Example 1 of the present invention.

[0045] FIG2 is an exploded view of the structure of the first embodiment of the present invention.

[0046] FIG3 is a schematic structural diagram of a second embodiment of the present invention.

[0047] FIG4 is a schematic diagram of the cross-sectional structure of the second embodiment of the present invention and an enlarged schematic diagram of the structure at point A. FIG4 is a schematic diagram of the cross-sectional structure of the second embodiment of the present invention.

[0048] FIG5 is a schematic structural diagram of embodiment 3 of the present invention.

[0049] FIG6 is a schematic diagram of the cross-sectional structure of the third embodiment of the present invention and an enlarged schematic diagram of the structure at point B.

[0050] FIG7 is a structural diagram of a fourth embodiment of the present invention.

[0051] FIG8 is a schematic cross-sectional view of a fourth embodiment of the present invention.

[0052] FIG9 is an exploded view of embodiment 5 of the present invention.

[0053] FIG10 is, from left to right, a front view of the core receiving, a schematic diagram of the cross-sectional structure of the core receiving, and a schematic diagram of the cross-sectional structure of the core output of the fifth embodiment of the present invention.

[0054] FIG11 is an exploded view of embodiment 6 of the present invention.

[0055] 12 are, from left to right, a main view of the core receiving, a schematic diagram of the cross-sectional structure of the core receiving, and a schematic diagram of the cross-sectional structure of the core output of the sixth embodiment of the present invention.

[0056] FIG13 is an exploded view of embodiment 7 of the present invention.

[0057] 14 are, from left to right, a main view of a core-outlet, a schematic diagram of a cross-sectional structure of a core-outlet, and a schematic diagram of a cross-sectional structure of a core-collecting according to a seventh embodiment of the present invention.

[0058] FIG15 is a partial enlarged view of point A of the cross-sectional structure diagram of the core of Example 7 of the present invention.

[0059] 16 are, from left to right, a core-out front view, a core-out cross-sectional structure diagram, and a core-collecting cross-sectional structure diagram of embodiment eight of the present invention.

[0060] 17 are, from left to right, a core-out front view, a core-out cross-sectional structure diagram, and a core-collecting cross-sectional structure diagram of embodiment nine of the present invention.

[0061] FIG18 is, from left to right, a main view of a core-outlet, a schematic diagram of a cross-sectional structure of a core-outlet, and a schematic diagram of a cross-sectional structure of a core-collecting according to a tenth embodiment of the present invention.

[0062] FIG19 is, from left to right, a main view of a core-outlet, a schematic diagram of a cross-sectional structure of a core-outlet, and a schematic diagram of a cross-sectional structure of a core-collecting according to the eleventh embodiment of the present invention.

[0063] FIG20 is, from left to right, a main view of a core-outlet, a schematic diagram of a cross-sectional structure of a core-outlet, and a schematic diagram of a cross-sectional structure of a core-collecting according to a twelfth embodiment of the present invention.

[0064] FIG21 is an exploded view of the thirteenth embodiment of the present invention.

[0065] FIG22 is, from left to right, a main view of a core-outlet, a schematic diagram of a cross-sectional structure of a core-outlet, and a schematic diagram of a cross-sectional structure of a core-collecting according to the thirteenth embodiment of the present invention.

[0066] 23 are, from left to right, a main view of a core-outlet, a schematic diagram of a cross-sectional structure of a core-outlet, and a schematic diagram of a cross-sectional structure of a core-collecting according to a fourteenth embodiment of the present invention.

[0067] 24 are, from left to right, a main view of a core-outgoing operation, a schematic diagram of a cross-sectional structure of a core-outgoing operation, and a schematic diagram of a cross-sectional structure of a core-collecting operation according to the fifteenth embodiment of the present invention.

[0068] FIG25 is, from left to right, a main view of a core-outgoing embodiment of the present invention, a schematic diagram of a cross-sectional structure of a core-outgoing embodiment, and a schematic diagram of a cross-sectional structure of a core-collecting embodiment.

[0069] FIG26 is an exploded view of the seventeenth embodiment of the present invention.

[0070] 27 are, from left to right, a main view of a core-outgoing operation, a schematic diagram of a cross-sectional structure of a core-outgoing operation, and a schematic diagram of a cross-sectional structure of a core-collecting operation according to a seventeenth embodiment of the present invention.

[0071] FIG28 is an exploded view of the eighteenth embodiment of the present invention.

[0072] FIG29 is a front view of the core receiving, a schematic diagram of the cross-sectional structure of the core receiving, and a schematic diagram of the cross-sectional structure of the core output according to the eighteenth embodiment of the present invention.

[0073] FIG30 is a partial enlarged view of point Z of the eighteenth embodiment of the present invention.

[0074] Description of the numbers in the figure:

[0075] 1 lower sleeve rod, 11 matching end, 1A lower sleeve rod body, 1B core replacement part, 1C limit extension part, 2 upper sleeve rod, 21 matching end, 22 upper sleeve rod limiting boss, 23 trigger slope, 24 anti-dislocation, 25 cover body, 26 writing tool limiting part, 2A upper sleeve rod body, 2C inner ring groove, 2D cross bar, 2G multi-function spring, 3 limit part, 31 control boss, 32 counterweight limiting boss, 3Z movable counterweight part, 4 reset part, 5 writing tool body, 61 gripping slope, 62 gripping rod, 621 gripping boss, 63 engagement gentle slope, 64 limit gentle slope. DETAILED DESCRIPTION

[0076] Specific embodiment 1: Please refer to Figures 1 and 2 for a gravity refill pen, which includes a retractable writing sleeve, a limiter 3 and a writing tool body 5. The writing sleeve includes a lower sleeve 1 and an upper sleeve 2 that are connected to each other. The writing tool body 5 is located inside the writing sleeve. Through the extension and retraction of the writing sleeve, the writing tool body 5 can change to two positions inside the writing sleeve: refilling and unfilling. The reset member 4 is provided between the writing tool body 5 and the lower sleeve 1, and provides continuous elastic force for the retraction and reset between the lower sleeve and the upper sleeve, that is, refilling. When unfilling, a temporary engaging state is formed between the lower sleeve 1 and the upper sleeve 2, and the temporary engaging state formed between the lower sleeve 1 and the upper sleeve 2 is limited by the limiter 3, so that the limiter 3, the lower sleeve 1 and the upper sleeve 2 form a stable matching state in the writing state, which is the unfilling state at this time.

[0077] When the limiting member 3 is displaced and / or rotated a certain distance due to the influence of gravity and loses its limiting effect on the temporary engagement state between the lower sleeve rod 1 and the upper sleeve rod 2, the temporary engagement state between the lower sleeve rod 1 and the upper sleeve rod 2 will be released immediately or after a certain delay. Then, under the influence of the reset member 4 or the reset structure, the length of the writing sleeve rod is extended and retracted to the maximum state, which is the core-retracted state.

[0078] The writing sleeve rod is also provided with a mating end 11 and a matching end 21, which are respectively provided on the lower sleeve rod 1 and the upper sleeve rod 2. The mating end 11 and the matching end 21 cooperate with each other to form a temporary engagement state.

[0079] A pair of strip-shaped slide grooves are provided on both sides of the lower sleeve rod 1. The limiter 3 is a strip-shaped block that can move up and down inside the slide groove. The limiter 3 is located above the mating end 11, and the lower part is wedged into the side of the mating end 11 close to the axis. It can apply downward pressure to the mating end 11 through its own gravity, forcing the mating end 11 to deform circumferentially and engage with the upper engaging area of ​​the mating end 21, so that the mating end 21 and the mating end 11 are more tightly engaged, thereby achieving the purpose of core locking.

[0080] There are two situations in which the position between the matching end 21 and the mating end 11 changes:

[0081] When the limiting member 3 does not apply gravity to the mating end 11, the engaging force formed between the matching end 21 and the matching end 11 is less than the reset force of the reset member 4. The reset member 4 prompts the mating end 11 to return to the bottom of the matching end 21, so that the writing tool body 5 is completely retracted into the lower sleeve rod 1 and the upper sleeve rod 2, which is the core-retracted state.

[0082] When the stopper 3 presses against the mating end 11, exerting additional gravity and / or a limiting force on the mating end 11, the sum of the additional gravity, the limiting force, and the engagement force between the mating end 21 and the mating end 11 is greater than the restoring force, thereby causing the mating end 11 to remain above the mating end 21, thereby maintaining the writing instrument body 5 exposed from the lower sleeve 1, thus indicating the ejected state.

[0083] A limiting gentle slope 64 is provided at the top of the mating end 11 and the bottom of the limiting member 3. The gradient of the limiting gentle slope 64 can determine the gravity and limiting force applied by the limiting member 3 to the mating end 11. The greater the gradient of the limiting gentle slope 64, the smaller the pressure converted from its gravity to the surface of the mating end 11, that is, the smaller the additional gravity and limiting force. The smaller the gradient of the limiting gentle slope 64, the greater the pressure converted from its gravity to the surface of the mating end 11, that is, the greater the additional gravity and limiting force, so that the additional gravity and limiting force applied by the limiting member 3 to the mating end 11 can be adjusted, thereby further adjusting the degree of engagement between the matching end 21 and the mating end 11, avoiding an overly tight engagement that makes it difficult to retract the core, and avoiding an overly loose engagement that causes the core to be not locked tightly enough after being ejected, resulting in an unstable writing state and affecting the writing experience.

[0084] A gripping slope 61 and a gripping rod 62 are provided between the lower sleeve rod 1 and the upper sleeve rod 2, and a gripping boss 621 is provided on the gripping rod 62. The gripping slope 61 and the gripping rod 62 are provided on the lower sleeve rod 1 and the upper sleeve rod 2, respectively. When the pen is in the ejected state, the stopper 3 is located between the bottom of the gripping slope 61 and the top of the mating end 11. After gripping the gripping rod 62, the gripping boss 621 squeezes the gripping slope 61, generating a force that squeezes the stopper 3 downward, causing the stopper 3 to squeeze the mating end 11 downward within the strip-shaped chute, making the engagement between the mating end 11 and the mating end 21 more secure. At the same time, during the gripping process, the stopper 3 is squeezed by the gripping rod 62, so that the pen will not be unable to resist the reset force generated by the reset member 4 due to a temporary deviation of the pen, causing the pen to retract, thereby improving the writing experience.

[0085] The upper and lower rods 2 and 1 are detachably connected by engaging the mating end 21 with the mating end 11. The upper and lower rods 2 and 1 can be assembled from multiple separate components. This design facilitates replacement of the writing instrument body or production assembly, improving production efficiency, reducing assembly time, and enhancing the user experience. For example, as shown in Figure 2, the upper rod 2 has a detachable cap at the top that engages the writing instrument body 5, using a threaded or other method.

[0086] During use, when writing is required, the lower sleeve rod 1 is slid upward, and the lower sleeve rod 1 is engaged with the upper sleeve rod 2 by engaging the mating end 11 with the matching end 21. When holding the pen vertically, after the limiting gentle slope 64 at the bottom of the limiting member 3 contacts the limiting gentle slope 64 at the top of the matching end 1, additional gravity and limiting force are applied to the matching end 11. The sum of the additional gravity and limiting force and the engaging force formed between the matching end 21 and the matching end 11 is greater than the reset force of the reset member 4, so that the matching end 11 can be kept above the matching end 21, that is, the writing tool body 5 can always remain exposed from the lower sleeve rod 1. After holding the gripping rod 62, the gripping boss 621 squeezes the gripping slope 61 to generate a force that squeezes the limiting member 3 downward, so that the limiting member 3 squeezes the matching end 11 downward inside the strip groove, making the engagement between the matching end 11 and the matching end 21 more secure. When the pen is in a flat state, when the gravity direction of the limiter 3 is offset from the reset force direction, the engagement force between the mating end 11 and the matching end 21 plus the limiter 3 offset in the gravity direction is not enough to resist the reset force generated by the reset member 4, prompting the mating end 11 to reset back to below the matching end 21, so that the writing tool body 5 is also completely retracted into the lower sleeve 1, achieving the purpose of automatically retracting the core when not in use.

[0087] Specific embodiment 2: Please refer to Figures 3-4 for a gravity refill pen, which includes a retractable writing sleeve rod, a limiter 3 and a writing tool body 5. The writing sleeve rod includes a lower sleeve rod 1 and an upper sleeve rod 2 that are connected to each other. The lower sleeve rod 1 is axially retractable relative to the upper sleeve rod 2. The writing tool body 5 is located inside the writing sleeve rod. The writing sleeve rod is provided with a mating end 11 and a matching end 21. The mating end 11 and the matching end 21 are respectively provided on the lower sleeve rod 1 and the upper sleeve rod 2. The limiter 3 is provided inside the upper sleeve rod 2 and can move up and down and / or rotate, and maintains the mating end 11 and the matching end 21 in a locked state by its own gravity. The reset member 4 is provided between the writing tool body 5 and the lower sleeve rod 1 to provide continuous elastic force for the telescopic reset between the lower sleeve rod and the upper sleeve rod, that is, for refilling the core. The limiter 3 is an annular member and is sleeved inside the upper sleeve rod 2. The limiter 3 can move up and down after being sleeved. Its lower part is located above the mating end 11, and the lower part is wedged into the side of the mating end 11 close to the axis. It can apply downward pressure to the mating end 11 through its own gravity, forcing the mating end 11 to deform circumferentially, and engage with the upper engaging area of ​​the matching end 21, so that the matching end 21 and the matching end 11 are more tightly engaged, achieving the purpose of core locking. The upper sleeve rod 2 is provided with a plurality of strip-shaped grooves near the head of the lower sleeve rod 1 to increase the deformation capacity. After gripping, the head of the upper sleeve rod 2 contacts the outer wall of the lower sleeve rod 1 inward, and the gripping force can further increase the friction to prevent the writing tool body 5 from retracting the core under the action of the reset member 4. There are two situations in which the position between the matching end 21 and the mating end 11 changes:

[0088] When the limiting member 3 does not apply gravity to the mating end 11, the engaging force formed between the matching end 21 and the matching end 11 is less than the reset force of the reset member 4. The reset member 4 prompts the mating end 11 to return to the bottom of the matching end 21, so that the writing tool body 5 is completely retracted into the lower sleeve rod 1 and the upper sleeve rod 2, which is the core-retracted state.

[0089] When the stopper 3 presses against the mating end 11, exerting additional gravity and / or a limiting force on the mating end 11, the sum of the additional gravity, the limiting force, and the engagement force between the mating end 21 and the mating end 11 is greater than the restoring force, thereby causing the mating end 11 to remain above the mating end 21, thereby maintaining the writing instrument body 5 exposed from the lower sleeve 1, thus indicating the ejected state.

[0090] The mating end 11 and the matching end 21 are provided with a gentle engagement slope 63. This slope controls the engagement force between the matching end 21 and the mating end 11, maintaining the stability of the pen's ejection state. By adjusting the angle or height of the gentle engagement slope 63, the balance between the engagement force and the return force can be adjusted, thereby better achieving the pen's writing function. The design of the gentle engagement slope 63 also improves the pen's stability and reliability, reducing fluctuations in the engagement force and the occurrence of abnormalities. It also guides radial inward deformation and circumferential outward deformation of the mating end 11.

[0091] Specific embodiment three: Please refer to Figures 5-6 for a gravity refill pen, which includes a retractable writing sleeve rod, a limiter 3 and a writing tool body 5. The writing sleeve rod includes a lower sleeve rod 1 and an upper sleeve rod 2 that are connected to each other. The lower sleeve rod 1 is axially retractable relative to the upper sleeve rod 2. The writing tool body 5 is located inside the writing sleeve rod. The lower sleeve rod 1 is provided with a mating end 11, and the upper sleeve rod 2 is provided with a matching end 21. The matching end 11 is deformable. The limiter 3 is connected to the outside of the connection between the lower sleeve rod 1 and the upper sleeve rod 2. The side of the limiter 3 close to the writing end of the writing tool body 5 contacts the matching end 11 to prevent the matching end 11 from circumferential deformation and maintain a locked state with the matching end 21. The reset member 4 is provided between the writing tool body 5 and the lower sleeve rod 1 to provide continuous elastic force for the telescopic reset between the lower sleeve rod and the upper sleeve rod, that is, for refilling the pen. The limiter 3 is an annular member that is sleeved onto the outside of the upper sleeve rod 2. The limiter 3 can move up and down after being sleeved. It is located above the mating end 11, and its lower portion is wedged into the side of the mating end 11 away from the axis. It can apply downward pressure to the mating end 11 through its own gravity, forcing the mating end 11 to deform radially, and engage with the upper engagement area of ​​the matching end 21, so that the engagement between the matching end 21 and the mating end 11 is tighter, achieving the purpose of core extraction and locking. The outer wall of the upper sleeve rod 2 on the side close to the lower sleeve rod 1 is an inclined surface to increase deformation capacity. After gripping, the head of the lower sleeve rod 1 contacts the outer wall of the upper sleeve rod 2 inward, and the gripping force can further increase friction to prevent the writing tool body 5 from retracting the core under the action of the reset member 4.

[0092] There are two situations in which the position between the matching end 21 and the mating end 11 changes:

[0093] When the limiting member 3 does not apply gravity to the mating end 11, the engaging force formed between the matching end 21 and the matching end 11 is less than the reset force of the reset member 4. The reset member 4 prompts the mating end 11 to return to the bottom of the matching end 21, so that the writing tool body 5 is completely retracted into the lower sleeve rod 1 and the upper sleeve rod 2, which is the core-retracted state.

[0094] When the stopper 3 presses against the mating end 11, exerting additional gravity and / or a limiting force on the mating end 11, the sum of the additional gravity, the limiting force, and the engagement force between the mating end 21 and the mating end 11 is greater than the restoring force, thereby causing the mating end 11 to remain above the mating end 21, thereby maintaining the writing instrument body 5 exposed from the lower sleeve 1, thus indicating the ejected state.

[0095] A control boss 31 is further provided on the inner side of the limiting member 3. The control boss 31 cooperates with the mating end 11 to provide additional control force when the pen is in the core-out state, so that the pen can be used more stably.

[0096] The upper sleeve rod 2 is provided with an upper sleeve rod limiting boss 22 to prevent excessive downward movement of the stopper 3. A counterweight limiting boss 32 may also be provided within the stopper 3. The upper sleeve rod limiting boss 22 and the counterweight limiting boss 32 cooperate to better prevent excessive downward movement of the stopper, preventing the stopper from excessively blocking the mating end 11 and the mating end 21 during core ejection, thereby reducing the failure rate during core ejection and improving the success rate of the writing operation.

[0097] Specific embodiment four: Please refer to Figures 7-8 for a gravity refill pen, which includes a retractable writing sleeve rod, a limiter 3 and a writing tool body 5. The writing sleeve rod includes a lower sleeve rod 1 and an upper sleeve rod 2 that are connected to each other. The lower sleeve rod 1 is axially retractable relative to the upper sleeve rod 2. The reset member 4 is a spring. The writing tool body 5 is located inside the writing sleeve rod. The writing sleeve rod is provided with a mating end 11 and a matching end 21. The mating end 11 and the matching end 21 are respectively provided on the lower sleeve rod 1 and the upper sleeve rod 2. The limiter 3 is provided inside the upper sleeve rod 2 and can move up and down and / or rotate, and maintains the mating end 11 and the matching end 21 in a locked state by its own gravity. The reset member 4 is provided between the writing tool body 5 and the lower sleeve rod 1 to provide continuous elastic force for the telescopic reset between the lower sleeve rod and the upper sleeve rod, that is, for refilling the pen.

[0098] The limiter 3 is an annular part and is sleeved inside the upper sleeve rod 2. The limiter 3 can move up and down after being sleeved. Its lower part is located above the mating end 11. It can apply downward pressure to the mating end 11 through its own gravity, so that it can be engaged with the upper engaging area of ​​the matching end 21, so that the matching end 21 and the mating end 11 are more tightly engaged, thereby achieving the purpose of core locking.

[0099] There are two situations in which the position between the matching end 21 and the mating end 11 changes:

[0100] When the limiting member 3 does not apply gravity to the mating end 11, the engaging force formed between the matching end 21 and the matching end 11 is less than the reset force of the reset member 4. The reset member 4 prompts the mating end 11 to return to the bottom of the matching end 21, so that the writing tool body 5 is completely retracted into the lower sleeve rod 1 and the upper sleeve rod 2, which is the core-retracted state.

[0101] When the stopper 3 presses against the mating end 11, exerting additional gravity and / or a limiting force on the mating end 11, the sum of the additional gravity, the limiting force, and the engagement force between the mating end 21 and the mating end 11 is greater than the restoring force, thereby causing the mating end 11 to remain above the mating end 21, thereby maintaining the writing instrument body 5 exposed from the lower sleeve 1, thus indicating the ejected state.

[0102] The inner diameter of the upper sleeve 2 gradually increases from bottom to top, forming a trigger slope 23. This trigger slope 23 allows the stopper 3 to more easily disengage from the mating end 11 when the pen is placed flat, due to the gradually increasing diameter of the upper sleeve 2. This reduces the engagement force between the mating end 21 and the mating end 11, thereby reducing the restoring force of the restoring member 4. This allows the writing instrument body 5 to be completely retracted into the lower sleeve 1, triggering the retraction of the writing instrument. The trigger slope 23 can engage the outer wall of the stopper 3 when the pen is tilted or placed vertically. The further the stopper 3 moves downward, the tighter it becomes, increasing friction and maintaining the retracted state.

[0103] The inner side wall of the lower sleeve rod 1 close to the upper sleeve rod 2 is also designed as a slope. When writing with the core removed, the hand gripping force can squeeze the upper sleeve rod 2 close to the lower sleeve rod 1, causing the slopes to conflict with each other and increase friction, thereby increasing the probability of non-separation between the mating end 11 and the matching end 21.

[0104] Specific embodiment 5: Please refer to Figures 9-10 for a gravity-retractable refill pen, which includes a retractable writing sleeve, a limiter 3, and a writing tool body 5. The writing sleeve includes a lower sleeve 1 and an upper sleeve 2 that are connected to each other. The writing tool body 5 is located inside the writing sleeve. Through the extension and retraction of the writing sleeve, the writing tool body 5 can change to two positions inside the writing sleeve: refilling and unfilling. The reset member 4 is arranged between the writing tool body 5 and the lower sleeve 1 to provide continuous elastic force for the retraction and reset between the lower sleeve and the upper sleeve, that is, refilling. When unfilling, a temporary locking state is formed between the lower sleeve 1 and the upper sleeve 2. The temporary locking state formed between the lower sleeve 1 and the upper sleeve 2 is limited by the limiter 3, so that the limiter 3, the lower sleeve 1, and the upper sleeve 2 form a stable matching state in the writing state, which is the unfilling state.

[0105] The writing sleeve rod is also provided with a mating end 11 and a matching end 21, which are respectively provided on the lower sleeve rod 1 and the upper sleeve rod 2. The mating end 11 and the matching end 21 cooperate with each other to form a temporary engagement state.

[0106] In order to better control the limit member and prevent it from moving downward excessively so that the lower sleeve rod 1 cannot perform axial telescopic movement, an upper sleeve rod limiting boss 22 is provided on the upper sleeve rod 2 to limit the limit member 3 from moving downward excessively. A counterweight limiting boss 32 may also be provided in the limit member 3. The upper sleeve rod limiting boss 22 and the counterweight limiting boss 32 cooperate with each other to better limit the limit member from moving downward excessively, thereby avoiding the limit member excessively blocking the formation of a temporary mating state between the mating end 11 and the matching end 21 when the core is ejected, reducing the failure rate when the core is ejected, and improving the success rate of the writing operation.

[0107] There are two situations in which the position between the matching end 21 and the mating end 11 changes:

[0108] When the limiting member 3 does not apply gravity to the mating end 11, the engaging force formed between the matching end 21 and the matching end 11 is less than the reset force of the reset member 4. The reset member 4 prompts the mating end 11 to return to the bottom of the matching end 21, so that the writing tool body 5 is completely retracted into the lower sleeve rod 1 and the upper sleeve rod 2, which is the core-retracted state.

[0109] When the stopper 3 presses against the mating end 11, exerting additional gravity and / or a limiting force on the mating end 11, the sum of the additional gravity, the limiting force, and the engagement force between the mating end 21 and the mating end 11 is greater than the restoring force, thereby causing the mating end 11 to remain above the mating end 21, thereby maintaining the writing instrument body 5 exposed from the lower sleeve 1, thus indicating the ejected state.

[0110] A snap-fitting slope 63 is provided on the mating end 11 and the core-outlet inner platform 21. The snap-fitting slope 63 controls the snap-fitting force between the core-outlet inner platform 21 and the mating end 11 to achieve a suitable snap-fitting effect and guide the radial inward deformation or circumferential outward deformation of the mating end.

[0111] In order to better adjust the limiting effect of the limiting member on the lower sleeve rod, a limiting slope 64 is provided on the mating end 11 and the limiting member 3. The limiting force between the mating end 11 and the limiting member 3 is adjusted by controlling the angle of the limiting slope 64.

[0112] In order to reduce the difficulty of processing, facilitate assembly and mass production, the upper sleeve rod 2 can be disassembled into an upper sleeve rod body 2A and a cover body 25.

[0113] Specific embodiment six: Please refer to Figures 11-12 for a gravity refill pen, which includes a retractable writing sleeve rod, a limiter 3 and a writing tool body 5. The writing sleeve rod includes a lower sleeve rod 1 and an upper sleeve rod 2 that are connected to each other. The lower sleeve rod 1 is axially retractable relative to the upper sleeve rod 2. The reset member 4 is an elastic structure, and the reset member 4 is arranged between the upper sleeve rod 2 and the lower sleeve rod 1 to provide continuous elastic force for the telescopic reset between the lower sleeve rod and the upper sleeve rod, that is, the refill. The writing tool body 5 is located inside the writing sleeve rod. The writing sleeve rod is provided with a mating end 11 and a matching end 21. The mating end 11 and the matching end 21 are respectively provided on the lower sleeve rod 1 and the upper sleeve rod 2. The limiter 3 is arranged inside the upper sleeve rod 2 to move up and down and / or rotate, and the mating end 11 and the matching end 21 are maintained in a locked state by its own gravity.

[0114] In order to better control the limiter and prevent it from moving downward excessively so that the lower sleeve rod 1 cannot perform axial telescopic movement, a counterweight limit boss 32 is further provided in the limiter 3, and an upper sleeve rod limit boss 22 is provided on the upper sleeve rod 2. The upper sleeve rod limit boss 22 cooperates with the counterweight limit boss 32 to limit the limiter 3 from moving downward excessively.

[0115] There are two situations in which the position between the matching end 21 and the mating end 11 changes:

[0116] When the limiting member 3 does not apply gravity to the mating end 11, the engaging force formed between the matching end 21 and the matching end 11 is less than the reset force of the reset member 4. The reset member 4 prompts the mating end 11 to return to the bottom of the matching end 21, so that the writing tool body 5 is completely retracted into the lower sleeve rod 1 and the upper sleeve rod 2, which is the core-retracted state.

[0117] When the stopper 3 presses against the mating end 11, exerting additional gravity and / or a limiting force on the mating end 11, the sum of the additional gravity, the limiting force, and the engagement force between the mating end 21 and the mating end 11 is greater than the restoring force, thereby causing the mating end 11 to remain above the mating end 21, thereby maintaining the writing instrument body 5 exposed from the lower sleeve 1, thus indicating the ejected state.

[0118] A snap-fitting slope 63 is provided on the mating end 11 and the core-outlet inner platform 21. The snap-fitting slope 63 controls the snap-fitting force between the core-outlet inner platform 21 and the mating end 11 to achieve a suitable snap-fitting effect and guide the radial inward deformation or circumferential outward deformation of the mating end.

[0119] In order to better adjust the limiting effect of the limiting member on the lower sleeve rod, a limiting slope 64 is provided on the mating end 11 and the limiting member 3. The limiting force between the mating end 11 and the limiting member 3 is adjusted by controlling the angle of the limiting slope 64, which is used to adjust the limiting force and gravity of the limiting member 3.

[0120] The upper sleeve rod 2 is provided with an anti-disengagement position 24, and the lower sleeve rod 1 is provided with an anti-disengagement boss 12. The anti-disengagement position 24 cooperates with the anti-disengagement boss 12 to prevent the telescopic sleeve rod from easily disengaging.

[0121] In order to reduce the difficulty of processing, facilitate assembly and mass production, the upper sleeve rod 2 can be disassembled into an upper sleeve rod body 2A and a cover body 25.

[0122] Specific embodiment seven: Please refer to Figures 13-15 for a gravity-retractable refill pen, which includes a retractable writing sleeve, a limiter 3, and a writing tool body 5. The writing sleeve includes a lower sleeve 1 and an upper sleeve 2 that are connected to each other. The reset member 4 is provided between the writing tool body 5 and the lower sleeve 1 to provide continuous elastic force for the retraction and reset between the lower sleeve and the upper sleeve, that is, for refilling the refill. The writing tool body 5 is located inside the writing sleeve. Through the extension and retraction of the writing sleeve, the writing tool body 5 can change to two positions inside the writing sleeve: refilling and ejecting the refill. When ejecting the refill, a temporary engagement state is formed between the lower sleeve 1 and the upper sleeve 2. The temporary engagement state formed between the lower sleeve 1 and the upper sleeve 2 is limited by the limiter 3, so that the limiter 3, the lower sleeve 1, and the upper sleeve 2 form a stable fit state in the writing state, which is the ejecting state. The writing sleeve rod is also provided with a mating end 11 and a matching end 21, which are respectively provided on the lower sleeve rod 1 and the upper sleeve rod 2. The mating end 11 and the matching end 21 cooperate with each other to form a temporary engagement state.

[0123] There are two situations in which the position between the matching end 21 and the mating end 11 changes:

[0124] When the limiting member 3 does not apply gravity to the mating end 11, the engaging force formed between the matching end 21 and the matching end 11 is less than the reset force of the reset member 4. The reset member 4 prompts the mating end 11 to return to the bottom of the matching end 21, so that the writing tool body 5 is completely retracted into the lower sleeve rod 1 and the upper sleeve rod 2, which is the core-retracted state.

[0125] When the stopper 3 presses against the mating end 11, exerting additional gravity and / or a limiting force on the mating end 11, the sum of the additional gravity, the limiting force, and the engagement force between the mating end 21 and the mating end 11 is greater than the restoring force, thereby causing the mating end 11 to remain above the mating end 21, thereby maintaining the writing instrument body 5 exposed from the lower sleeve 1, thus indicating the ejected state.

[0126] A snap-fitting slope 63 is provided on the mating end 11 and the core-outlet inner platform 21. The snap-fitting slope 63 controls the snap-fitting force between the core-outlet inner platform 21 and the mating end 11 to achieve a suitable snap-fitting effect and guide the radial inward deformation or circumferential outward deformation of the mating end.

[0127] The limiting member 3 can be arranged in the writing sleeve rod in the following ways:

[0128] In order to reduce the difficulty of processing, facilitate assembly and mass production, a cross bar 2D is further provided in the upper sleeve rod 2, and one end of the limiting member 3 is movably fixed on the cross bar 2D.

[0129] In order to reduce the friction between the limiting member and the writing sleeve rod and extend the service life, the limiting member 3 adds a steel ball between the limiting member 3 and the writing sleeve rod.

[0130] A writing tool limiting portion 26 is further provided in the upper sleeve rod 2 .

[0131] Specific Example 8: Please refer to Figure 16 for a gravity-retracting pen. This differs from Example 7 in the design of the retaining member 3. The upper sleeve 2 is provided with an inner annular groove 2C, and the ends of the retaining member 3 extend into the inner annular groove 2C. This allows the retaining member 3 to rotate within the annular groove, ensuring that the direction of gravity on the retaining member 3 is perpendicular to the horizontal plane. The mating ends 11 are evenly distributed circumferentially, with open slots whose width is smaller than the width of the retaining member 3, ensuring that the retaining member 3 can mate with the mating ends 11 regardless of its position.

[0132] Specific embodiment nine: Please refer to Figure 17 for a gravity refill pen, which differs from embodiment eight in that the style of the limiter 3 is different, and the way the limiter 3 is arranged in the writing sleeve is different in that the upper sleeve 2 can be disassembled into the upper sleeve body 2A and the cover body 25, and one end of the limiter 3 is movably fixed to the outer ring of the cover body 25.

[0133] Specific embodiment ten: Please refer to Figure 18 for a gravity refill pen. The difference from embodiment nine is that the limiter 3 can be replaced by a steel ball, and a limiting boss 22 is provided on the cover body 25. The limiting boss 22 limits the maximum axial movement distance of the limiter 3 to prevent excessive downward movement.

[0134] Specific embodiment 11: Please refer to Figure 19 for a gravity refill pen. The difference from embodiment 9 lies in the way the limiting member 3 is arranged in the writing sleeve. The upper sleeve 2 can be separated into an upper sleeve body 2A and a cover 25. The limiting member 3 is located between the upper sleeve body 2A and the cover 25. The cover 25 cooperates with the upper sleeve body 2A to enable the limiting member 3 to rotate but not to move axially.

[0135] Specific Example 12: Please refer to Figure 20 for a gravity-retracting pen. This differs from Example 5 in that a multifunctional elastic spring 2G is provided between the stopper 3 and the upper sleeve 2. The ends of the multifunctional spring 2G are fixed to the stopper 3 and the upper sleeve 2, respectively. The elastic force of the multifunctional spring 2G is less than the gravity of the stopper 3, causing the spring to remain in an expanded state.

[0136] When the pen falls, the multifunctional spring 2G will change from an open state to a tightened state, causing the telescopic sleeve to move downward relative to the limit member 3, so that the gravity of the limit member 3 is no longer applied to the mating end 11, and the engaging force formed between the core-outlet inner platform 21 and the mating end 11 is smaller than the reset force of the reset member 4. The reset member 4 prompts the mating end 11 to return to the bottom of the core-outlet inner platform 21, so as to make the writing tool body 5 completely retracted into the lower sleeve rod 1 and the upper sleeve rod 2, thereby achieving the purpose of automatically retracting the core to protect the writing tool body 5 when it falls.

[0137] Specific embodiment 13: Please refer to Figures 21-22 for a gravity core-collecting pen. The difference from embodiment 5 is that the structure shown in the figure has the mating end 11 and the core-outlet inner platform 21 placed in front, which reduces the total length of the product and controls the cost.

[0138] The lower sleeve rod 1 moves upward, driving the limit member 3 to move, so that the upper sleeve rod 2 reaches between the lower sleeve rod 1 and the limit member 3. The sum of the gravity and the limit force of the limit member 3 and the limit force of the lower sleeve rod 1 is greater than the reset force of the reset member 4, so that the core-outlet inner platform 21 and the mating end 11 are engaged, thereby realizing the core-outlet state.

[0139] When the structure is placed horizontally, the gravity direction of the limiter 3 is converted from axial to radial, so that the sum of the limiting force of the limiter 3 and the limiting force of the lower sleeve rod 1 is less than the reset force of the reset member 4. The reset member 4 prompts the mating end 11 to return to the bottom of the core-out inner platform 21, so that the writing tool body 5 is completely retracted into the lower sleeve rod 1 and the upper sleeve rod 2, which is the core-retracted state.

[0140] Specific embodiment 14: Please refer to Figure 23 for a gravity refill pen. The difference from embodiment 5 is that a pen clip is added to the upper sleeve rod 1, and the core outlet inner platform 21 is set on the pen clip. The trigger space for the matching end 11 and the core outlet inner platform 21 is increased, and the volume of the limiter 3 is increased, so that the adjustable gravity range of the limiter 3 is increased, and the use effect is better; a multi-function spring 2G is also provided between the limiter 3 and the upper sleeve rod 2. When it is necessary to reduce the weight of the tail of the pen, it is necessary to reduce the gravity of the limiter 3. In order to prevent the pen from being in an inclined writing state due to insufficient downward pressure, resulting in the inability of the matching end and the matching end to normally reach a good and stable temporary matching state, the multi-function spring is located between the limiter and the upper sleeve rod. Under normal circumstances, it is in a slightly compressed state, providing a slight elastic force to the limiter.

[0141] Specific embodiment 15: Please refer to Figure 24 for a gravity refill pen, which differs from embodiment 8 in that the limiting member 3 is an annular structure, the core outlet inner platform 21 is set on the cover body 25, and the matching end 11 is deformed inwardly toward the axis to reduce the overall diameter.

[0142] Specific embodiment 16: Please refer to Figure 25 for a gravity retractable pen. The difference from embodiment 5 is that the volume of the limiter 3 is increased, so that the adjustable gravity range of the limiter 3 is increased, the deformation requirement for the mating end 11 is reduced, and the triggering difficulty is reduced.

[0143] Specific Example 17: Please refer to Figures 26-27 for a gravity-retracting pen. This differs from Example 16 in that, to facilitate installation and improve production efficiency, the upper sleeve 2 can be split into an upper sleeve body 2A and a cover 25. To better ensure that the stopper 3 restricts the mating end 11, the contact surfaces of the stopper 3 and the mating end 11 are both curved, increasing the contact area and reducing the gravity required by the stopper 3. To prevent the telescopic sleeve from separating, the lower sleeve 1 is provided with an axially oriented control portion 1E, which controls the maximum telescopic distance of the telescopic sleeve through the control portion 1E and the writing tool limiter 26.

[0144] Specific embodiment 18: Please refer to Figures 28-30 for a gravity refill pen. The difference from embodiment 17 is that a movable counterweight 3Z is further provided in the limiter 3 to increase the gravity of the limiter 3 and provide a certain impact force. When the refill needs to be refilled, the gravity direction of the pen can be adjusted so that the counterweight moves to the upper end of the limiter 3, thereby bringing an upward impact force to the limiter 3, helping the limiter 3 to better break away from the temporary mating state between the mating end and the matching end, and at the same time, it can also provide additional effects including sound, usage experience, etc. in addition to the functions.

[0145] In the description of the present invention, it is necessary to understand that the above-mentioned limiter 3 has an angle requirement for the offset between the gravity direction and the reset force direction, which does not mean that even a small offset will cause reset. In actual application, the limiter 3 is allowed to have a certain angle of gravity offset range, that is, within the normal inclination angle of pen use, even if the gravity direction and the reset force are slightly offset, it will not trigger reset. Reset will only be caused when the offset angle is too large. This requires relevant design of the gravity of the limiter 3, or the slope of the limiting gentle slope 64 in Example 1 and other influencing factors in actual application.

[0146] The above deformation at the mating end 11 or the matching end 21 is relative. No matter the deformation is inward or outward, as long as the core-ejecting engagement and core-collecting disengagement requirements of the mating end 11 and the core inner ring 21 can be met, it will be sufficient.

[0147] The following are some supplementary explanations of the present invention:

[0148] 1. When the pen grip area is located on the upper sleeve, when the limiting member 3 presses on the mating end 11, it will exert additional gravity and / or limiting force on the mating end 11. The sum of the additional gravity, the limiting force, and the engagement force between the mating end 21 and the mating end 11 is greater than the restoring force. This will cause the mating end 11 to remain above the mating end 21, so that the writing instrument body 5 remains exposed from the lower sleeve 1, indicating the core is out of the state.

[0149] If the pen grip area is located on the lower sleeve, then when the stopper 3 presses against the mating end 11, it applies additional gravity and / or a limiting force to the mating end 11. The sum of the additional gravity, the limiting force, and the engagement force between the mating end 21 and the mating end 11 is greater than the sum of the restoring force and the writing pressure. This forces the mating end 11 to remain above the mating end 21, allowing the writing instrument body 5 to remain exposed from the lower sleeve 1. This is the ejected state.

[0150] 2. When the limiting slope is not used, the limiting component only presses the mating end and / or matching end by its own gravity. In this case, the gravity requirement is greater. In order to improve the effect, you can choose to add a multi-function spring to provide additional slight elastic force.

[0151] 3. The limiting gentle slope, the engaging gentle slope and the triggering slope are not limited to flat slopes, but can also be arc surfaces, irregular surfaces or concave and convex surfaces.

[0152] 4. The limiting slope can not only adjust the gravity effect of the limiting part, but also be used to adjust the limiting force of the limiting part.

[0153] 5. The mating end and / or matching end can be deformed.

[0154] 6. The control part 1E usually cooperates with the writing tool limiting part to prevent the lower sleeve rod and the upper sleeve rod from completely separating from each other through the limitation of the writing tool limiting part; it can also be combined with other structures similar to the writing tool limiting part; or the upper sleeve rod and the lower sleeve rod can use other existing limiting structures to prevent the two from separating, while maintaining a state of movable and telescopic cooperation.

Claims

1. A gravity refill pen, characterized by: It comprises a retractable writing rod, a limiting member (3) and a writing tool body (5); The writing sleeve rod comprises a lower sleeve rod (1) and an upper sleeve rod (2) which are sleeved together; The writing tool body (5) is located inside the writing sleeve rod; through the extension and retraction of the writing sleeve rod, the writing tool body (5) can change into two positions in the writing sleeve rod: the core is received and the core is released; When the core is ejected, a temporary engagement state is formed between the lower sleeve rod (1) and the upper sleeve rod (2), and the temporary engagement state formed between the lower sleeve rod (1) and the upper sleeve rod (2) is limited by the limiting member (3), so that a stable matching state is formed between the limiting member (3), the lower sleeve rod (1) and the upper sleeve rod (2) in the writing state, and this is the core ejection state; When the limiting member (3) is displaced and / or rotated a certain distance under the influence of gravity and loses its limiting influence on the temporary engagement state between the lower sleeve rod (1) and the upper sleeve rod (2), the temporary engagement state between the lower sleeve rod (1) and the upper sleeve rod (2) will be released immediately or after a certain delay, and then, under the influence of the reset member (4) or the reset structure, the length of the writing sleeve rod is extended to the maximum state, which is the core-retracted state.

2. A gravity refill pen, characterized by: It comprises a retractable writing sleeve rod, a limiting member (3) and a writing tool body (5); The writing sleeve rod comprises a lower sleeve rod (1) and an upper sleeve rod (2) which are sleeved together; the lower sleeve rod (1) is axially telescopic relative to the upper sleeve rod (2); The writing tool body (5) is located inside the writing sleeve; The writing sleeve rod is provided with a fitting end (11) and a matching end (21); the fitting end (11) and the matching end (21) are respectively provided on the lower sleeve rod (1) and the upper sleeve rod (2); The limiting member (3) is arranged inside the upper sleeve rod (2) and is movable up and down and / or rotatable. The limiting member (3) enables the engaging end (11) and the matching end (21) to maintain an engaged state.

3. The gravity-retracting pen according to claim 1, characterized in that: The writing sleeve rod is further provided with a mating end (11) and a matching end (21), and the mating end (11) and the matching end (21) are respectively provided on the lower sleeve rod (1) and the upper sleeve rod (2); the mating end (11) and the matching end (21) cooperate with each other to form a temporary engaging state.

4. A gravity refill pen according to any one of claims 1 to 2, characterized in that: The lower portion of the limiting member (3) is wedged into the side of the matching end (11) close to the axis, and is used to compress the matching end (11) to deform circumferentially, thereby better maintaining the engagement state with the upper engagement area of ​​the matching end (21).

5. A gravity refill pen according to any one of claims 1 to 2, characterized in that: A gripping slope (61) or a gripping rod (62) is provided between the lower sleeve rod (1) and the upper sleeve rod (2), respectively, for squeezing the gripping slope (61) to allow the lower sleeve rod (1) to axially move and retract into the upper sleeve rod (2).

6. A gravity refill pen according to any one of claims 1 to 2, characterized in that: A trigger slope (23) is provided in the upper sleeve rod (2).

7. A gravity refill pen according to any one of claims 1 to 2, characterized in that: The limiting member (3) is a strip block, and a pair of strip sliding grooves are provided on both sides of the lower sleeve rod (1) corresponding to the limiting member (3); or the limiting member (3) is an annular member, a spherical member, a semi-annular member or a special shape, and is installed outside or inside the upper sleeve rod (2).

8. A gravity refill pen, characterized by: The invention comprises a retractable writing sleeve rod, a limiting member (3) and a writing tool body (5); the writing sleeve rod comprises a lower sleeve rod (1) and an upper sleeve rod (2) which are sleeved together; the lower sleeve rod (1) is retractable relative to the upper sleeve rod (2) along the axial direction; The writing tool body (5) is located inside the writing sleeve; The lower sleeve rod (1) is provided with a mating end (11), and the upper sleeve rod (2) is provided with a matching end (21); the mating end (11) is deformable; The limiting member (3) is sleeved on the outside of the connection between the lower sleeve rod (1) and the upper sleeve rod (2), and the side of the limiting member (3) close to the writing end of the writing tool body (5) contacts the matching end (11) to prevent the matching end (11) from circumferential deformation and maintain a locked state with the matching end (21).

9. A gravity refill pen according to any one of claims 1 to 7, characterized in that: A multifunctional spring (2G) with elasticity is also provided between the limiting member (3) and the upper sleeve rod (2).

10. A gravity refill pen according to any one of claims 1 to 7, characterized in that: An upper sleeve rod limiting boss (22) is provided on the upper sleeve rod (2).

11. A gravity refill pen according to any one of claims 1 to 9, characterized in that: There are two situations in which the position changes between the matching end (21) and the mating end (11) occur: When the limiting member (3) does not exert gravity on the mating end (11), the engaging force formed between the mating end (21) and the mating end (11) is smaller than the resetting force of the resetting member (4), and the resetting member (4) causes the mating end (11) to return to the bottom of the mating end (21), so that the writing tool body (5) is completely retracted into the lower sleeve rod (1) and the upper sleeve rod (2), which is the retracted state; When the limiting member (3) is pressed on the mating end (11), an additional gravity and / or limiting force is applied to the mating end (11), and the sum of the additional gravity and / or limiting force and the engaging force formed between the mating end (21) and the mating end (11) is greater than the reset force; The fitting end (11) is urged to remain above the matching end (21), so as to keep the writing tool body (5) exposed from the lower sleeve rod (1), which is the core-out state.

12. A gravity refill pen according to any one of claims 1 to 9, characterized in that: A gentle engagement slope (63) is provided on the mating end (11) and / or the matching end (21).

13. A gravity refill pen according to any one of claims 1 to 9, characterized in that: The mating end (11) and / or the limiting member (3) are provided with a limiting gentle slope (64), which controls the limiting force between the mating end (11) and the limiting member (3) and is used to adjust the limiting force and gravity of the limiting member (3).

14. A gravity refill pen according to any one of claims 1 to 9, characterized in that: When the writing sleeve rod is in a reset telescopic state, a reset structure is provided between the lower sleeve rod (1) and the upper sleeve rod (2), or a reset member (4) is provided between the lower sleeve rod (1) and the upper sleeve rod (2); the writing tool body (5) is clamped at the tail end of the writing sleeve rod, or the lower sleeve rod (1) and the upper sleeve rod (2) are transmitted through the writing tool body (5); and the reset member (4) is provided between the core outlet of the writing sleeve rod and the writing end of the writing tool body (5).

15. A gravity refill pen according to any one of claims 1 to 9, characterized in that: The limiting member (3) can be replaced by a steel ball or a steel ball can be added between the limiting member (3) and the writing sleeve rod.

16. A gravity refill pen according to any one of claims 1 to 9, characterized in that: The limiting member (3) is further provided with a movable limiting member (3Z) and / or has a weight sufficient to allow the limiting member (3) to escape from the temporary engagement state.

17. A gravity refill pen according to any one of claims 1 to 9, characterized in that: A writing tool limiting portion (26) is also provided in the upper sleeve rod (2).

18. A gravity refill pen according to any one of claims 1 to 9, characterized in that: The upper sleeve rod (2) can be split into an upper sleeve rod body (2A) and a cover body (25) and / or the lower sleeve rod (1) can be split into a lower sleeve rod body (1A) and a core replacement part (1B).

19. A gravity refill pen according to any one of claims 1 to 9, characterized in that: The limiting member (3) can be arranged in the writing sleeve rod in the following ways:

1. The limiting member (3) is movably arranged between the upper sleeve rod (2) and the lower sleeve rod (1); 2. The upper sleeve rod (2) can be separated into an upper sleeve rod body (2A) and a cover body (25), and one end of the limiter (3) is movably fixed to the outer ring of the cover body (25); 3. One end of the limiting member (3) is movably fixed to the center of the upper sleeve rod (2); 4. The upper sleeve rod (2) is provided with an inner ring groove (2C), and both ends of the limiting member (3) are provided in the inner ring groove (2C); 5. A cross bar (2D) is further provided inside the upper sleeve rod (2), and one end of the limiter (3) is movably fixed on the cross bar (2D); 6. The upper sleeve rod (2) can be separated into an upper sleeve rod body (2A) and a cover body (25), and the limiting member (3) is located between the upper sleeve rod body (2A) and the cover body (25); 7. The lower sleeve rod (1) is further provided with a limit extension portion (1C), and the limit member (3) is located between the limit extension portion (1C) and the upper sleeve rod (2).

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