Gravity refill collecting pen

Abstract

The invention relates to a gravity refill collecting pen. The gravity refill collecting pen comprises a telescopic writing loop bar, a limiting piece and a writing tool body. The writing loop bar comprises a lower loop bar and an upper loop bar which are connected in a sleeved mode. The writing tool body is located in the writing loop bar. Through stretching and retracting of the writing loop bar, the writing tool main body has two position changes of core collecting and core discharging in the writing loop bar. A temporary clamping state is formed between the lower sleeve rod and the upper sleeve rod, and the temporary clamping state formed between the lower sleeve rod and the upper sleeve rod is limited through the limiting piece, so that a stable matching state is formed among the limiting piece, the lower sleeve rod and the upper sleeve rod in a writing state, and at the moment, a core discharging state is achieved. When the limiting piece moves by a certain distance under the influence of gravity and loses the limiting influence on the clamping state between the lower sleeve rod and the upper sleeve rod, the matching state between the lower sleeve rod and the upper sleeve rod can be relieved immediately or delayed for a certain time, and the writing sleeve rod is in a core collecting state when the length of the writing sleeve rod stretches to the maximum state under the influence of the reset piece or the reset structure.

Description

Technical Field

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

[0002] The development of pens has gone through a long history. From the initial bamboo slips and brushes, to the fountain pens of the Industrial Revolution, and then to the modern gel pens, the form and function of pens have been continuously improved and expanded. They are tools for the inheritance of human civilization and have also brought more convenience and possibilities to people's writing and painting. Most of the gel pens on the market today are tail-pressed and capped. The tail-pressed gel pens can be used to eject and retract the core by pressing the tail. This method is convenient to use, but it often makes a loud noise when pressed, which will damage the quiet environment. The capped gel pens protect the pen core by snapping the pen cap, but the pen cap of this method is easy to lose, which affects 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 to use and noiseless, and the assembly of the lower sleeve rod and the upper sleeve rod is not prone to loss of internal parts. 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 operation is also required to release the self-locking state. 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, automatically retract the core when not in use, and is easy to use. Summary of the invention

[0005] The invention aims to provide a gravity core-collecting pen, which can realize the effects of core-out locking and core-collecting automatically by gravity and is easy to use.

[0006] To achieve the above object, the present invention provides the following technical solutions: The invention discloses a gravity retractable pen, comprising a retractable writing sleeve rod, a limiter and a writing tool body. The writing sleeve rod comprises a lower sleeve rod and an upper sleeve rod which are sleeved with each other.

[0007] The writing tool body is located in the writing sleeve rod. Through the extension and retraction of the writing sleeve rod, the writing tool body has two position changes in the writing sleeve rod: core receiving and core exiting.

[0008] When the core is ejected, a temporary engaging state is formed between the lower sleeve rod and the upper sleeve rod, and the temporary engaging state formed between the lower sleeve rod and the upper sleeve rod is limited by the limiting member, so that the limiting member, the lower sleeve rod and the upper sleeve rod form a stable matching state under the writing state, which is the core ejecting state at this time.

[0009] When the limiting member is displaced and / or rotated a certain distance due to the influence of gravity and loses its limiting influence on the temporary engagement state between the lower sleeve rod and the upper sleeve rod, the temporary engagement state between the lower sleeve rod and the upper sleeve rod will be released immediately or after a certain delay. Then, under the influence of the reset member or the reset structure, the length of the writing sleeve rod is extended to the maximum state, which is the core-retracted state.

[0010] A gravity retractable pen comprises a retractable writing sleeve rod, a limiting piece and a writing tool body.

[0011] The writing sleeve rod comprises a lower sleeve rod and an upper sleeve rod which are sleeved with each other. The lower sleeve rod is telescopically movable relative to the upper sleeve rod along the axial direction.

[0012] The writing instrument body is located inside the writing sleeve rod.

[0013] The writing sleeve rod is provided with a fitting end and a matching end, and the fitting end and the matching end are respectively arranged on the lower sleeve rod and the upper sleeve rod.

[0014] The limiting member is arranged inside the upper sleeve rod and can move up and down and / or rotate, and the engaging end and the matching end are maintained in an engaged state by their own gravity.

[0015] When the core is retracted, the gravity of the limiter itself releases the limiter from limiting or exerting additional gravity on the matching end or the mating end, thereby eliminating the temporary mating state between the mating end and the matching end, and the upper sleeve rod and the lower sleeve rod resume the state of the maximum mating distance, thereby achieving core retraction.

[0016] As a further improvement of the present invention, the writing sleeve rod is further provided with a mating end and a matching end, and the mating end and the matching end are respectively provided on the lower sleeve rod and the upper sleeve rod. The mating end and the matching end cooperate with each other to form a temporary engagement state, and the lower part of the limiter is wedged into the side of the mating end close to the axis to compress the circumferential deformation of the mating end, and better maintain the engagement state with the upper engagement area of ​​the matching end, so as to achieve the purpose of core locking.

[0017] As a further improvement of the present invention, a gripping slope and a gripping rod are provided between the lower sleeve rod and the upper sleeve rod, and a gripping boss is provided on the gripping rod, which is used to squeeze the gripping slope to make the lower sleeve rod axially move and retract into the upper sleeve rod. The gripping slope and the gripping rod are provided on the lower sleeve rod or the 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. When the gravity touch pen is held by hand, the lower sleeve rod can be moved upward by squeezing the gripping boss, so as to achieve the purpose of manually squeezing out the core.

[0018] As a further improvement of the present invention, the inner wall diameter of the upper sleeve rod gradually increases from bottom to top to form a trigger slope, which is used to make the limiter disengage from the mating end to trigger the retraction of the pen when the pen is placed flat. The trigger slope can be clamped with the outer wall of the limiter when the pen is tilted or placed vertically in use, and the limiter moves downwards and becomes tighter, increasing friction to keep the pen in the retraction state.

[0019] As a further improvement of the present invention, the limiting member is a strip block, and a pair of strip sliding grooves are provided on both sides of the lower sleeve rod corresponding to the limiting member. Or the limiting member is an annular member sleeved on the outside of the upper sleeve rod.

[0020] A gravity retractable pen comprises a retractable writing sleeve rod, a limiting piece and a writing tool body.

[0021] The writing sleeve rod comprises a lower sleeve rod and an upper sleeve rod which are sleeved with each other. The lower sleeve rod is telescopically movable relative to the upper sleeve rod along the axial direction.

[0022] The writing instrument body is located inside the writing sleeve rod.

[0023] The lower sleeve rod is provided with a mating end, and the upper sleeve rod is provided with a matching end. The mating end or the matching end can be deformed.

[0024] The limiting member is sleeved on the outside of the connection between the lower sleeve rod and the upper sleeve rod. The side of the limiting member close to the writing end of the writing tool body abuts against the matching end to prevent the matching end from circumferential deformation and maintain a clamping state with the matching end.

[0025] As a further improvement of the present invention, a control boss is further provided on the inner side of the limiter, 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.

[0026] As a further improvement of the present invention, an upper sleeve rod limiting boss is provided on the upper sleeve rod, which is used to limit the excessive downward movement of the limit piece. A counterweight limiting boss may also be provided in the limit piece. The upper sleeve rod limiting boss and the counterweight limiting boss cooperate with each other to better limit the excessive downward movement of the limit piece, thereby avoiding the limit piece from 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.

[0027] As a further improvement of the present invention, there are two situations in which the position change between the matching end and the mating end occurs: When the limiting member does not apply gravity to the mating end, the clamping force formed between the matching end and the mating end is smaller than the reset force of the reset member, and 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.

[0028] When the limiting member is pressed on the mating end, it will exert additional gravity and / or limiting force on the mating end, and the sum of the additional gravity, limiting force, and the engaging force formed between the mating end and the mating end is greater than the reset force. This causes the mating end to remain above the mating end, so that the writing tool body remains exposed from the lower sleeve rod, which is the core-out state.

[0029] As a further improvement of the present invention, a gentle engagement slope is provided on the mating end and the matching end, and the engagement force between the matching end and the mating end can be controlled by adjusting the slope of the gentle engagement slope to achieve a suitable engagement effect, so as to avoid the unstable core-out state caused by too small an engagement force, and to avoid the difficulty of core collection caused by too large an engagement force. At the same time, it can play a guiding role when the mating end undergoes radial inward deformation or circumferential outward deformation.

[0030] As a further improvement of the present invention, a limiting slope is provided on the mating end and the limiting member. 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.

[0031] As a further improvement of the present invention, 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 are used to facilitate assembly and disassembly and core replacement in actual production.

[0032] As a further improvement of the present invention, 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, so that it can function more reliably.

[0033] As a further improvement of the present invention, a multifunctional spring with elasticity is further provided between the limiting member and the upper sleeve rod; The multifunctional spring has two different usage modes and parameter requirements according to different actual usage scenarios: 1. When the anti-fall function is required, the two ends of the multifunctional spring are respectively fixed to the limiter and the upper sleeve rod; the elastic force of the multifunctional spring (2G) is less than the gravity of the limiter (3), and when the pen is in a writing posture, the multifunctional spring is in a stretched state, which is used to trigger the retraction of the pen when it falls, thereby protecting the writing tool body from damage and extending the service life;

[0034] 2. When it is necessary to reduce the weight of the tail of the pen, and thus reduce the gravity of the limiter (3), in order to prevent the pen from being in a tilted writing state, where the downward pressure is insufficient, resulting in the mating end and the matching end being unable to normally achieve a good stable temporary mating state, the multifunctional spring is located between the limiter and the upper sleeve rod, and is in a slightly compressed state under normal conditions, providing a slight elastic force to the limiter.

[0035] As a further improvement of the present invention, the limit member can be replaced by a steel ball or a steel ball can be added between the limit member and the writing sleeve rod. The limit member 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 the limiting force of the limit member so that it can function more stably. The counterweight is used to increase the gravity of the limit member (3) and, when necessary, provide an impact force in the opposite direction of the limit of the limit member, so as to help the limit member to better break away from the temporary mating state of the mating end and the matching end when necessary.

[0036] As a further improvement of the present invention, 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.

[0037] As a further improvement of the present invention, the limiting member can be arranged in the writing sleeve rod in the following ways: 1. The limiter is movably arranged between the upper sleeve rod and the lower sleeve rod.

[0038] 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.

[0039] 3. One end of the limiter is movably fixed to the center of the upper sleeve rod.

[0040] 4. The upper sleeve rod is provided with an inner ring groove, and the two ends of the limit member are arranged in the inner ring groove.

[0041] 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.

[0042] 6. The upper sleeve rod can be separated into an upper sleeve rod body and a cover body, and the limit member is located between the upper sleeve rod body and the cover body.

[0043] 7. The lower sleeve rod is also provided with a limit extension portion, and the limit member is located between the limit extension portion and the upper sleeve rod.

[0044] Compared with the prior art, the present invention has the following beneficial effects: 1. The structure is simple, and at least three accessories are needed (upper sleeve rod, lower sleeve rod and limiter are used, and writing tools and reset parts are all necessary universal parts, so they are not included in the quantity) to complete the excellent core-out / core-in action; the gravity and / or limit of the limiter are used to increase the tightness of the engagement between the matching end and the mating end, so as to maintain the core-out state. When the limiter is displaced by gravity or external force, the temporary mating state between the mating end and the matching end is released, and the core-in state is restored.

[0045] 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 it loses weight.

[0046] 3. Lightweight structure: To address the influence of gravity on the tail, the weight can be reduced to a certain extent through multi-functional springs.

[0047] 4. The core retraction is more sensitive when the pen is placed horizontally. By setting a trigger slope that gradually increases from bottom to top or reserving sufficient space on both sides of the limiter to facilitate the tipping of the limiter (3), gravity retraction can be achieved when the pen is placed horizontally. When the pen is placed horizontally, the limiter is separated from the mating end to trigger the core retraction, thereby achieving an automatic core retraction effect.

[0048] 5. The trigger force is adjustable. By setting a gentle engagement slope on the mating end and the matching end, the size of the engagement force between the mating end and the matching end is determined by the slope of the gentle engagement slope, thereby achieving a suitable engagement effect.

[0049] 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 held by hand, so as to achieve the purpose of manually squeezing out the core.

[0050] 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.

[0051] 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 end, or at the outside or inside of the writing sleeve rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a structural schematic diagram of embodiment 1 of the present invention.

[0053] Figure 2 It is a schematic cross-sectional structure diagram of embodiment 1 of the present invention.

[0054] Figure 3 It is a structural explosion diagram of embodiment 1 of the present invention.

[0055] Figure 4 This is a structural diagram of embodiment 2 of the present invention.

[0056] Figure 5 It is a schematic cross-sectional structure diagram of embodiment 2 of the present invention.

[0057] Figure 6 This is an enlarged schematic diagram of the structure at A of Example 2 of the present invention.

[0058] Figure 7 This is a structural diagram of embodiment 3 of the present invention.

[0059] Figure 8 It is a schematic cross-sectional structure diagram of embodiment 3 of the present invention.

[0060] Fig. 9 This is an enlarged schematic diagram of the structure at B in Example 3 of the present invention.

[0061] Fig.10 This is a structural diagram of embodiment 4 of the present invention.

[0062] Fig.11 It is a schematic cross-sectional structure diagram of embodiment 4 of the present invention.

[0063] Fig.12 This is an exploded view of embodiment 5 of the present invention.

[0064] Fig.13 It is a front view and a cross-sectional structure diagram of the core collection of the fifth embodiment of the present invention.

[0065] Fig.14 It is a front view and cross-sectional structure diagram of a core output according to the fifth embodiment of the present invention.

[0066] Fig.15 This is an exploded view of embodiment 6 of the present invention.

[0067] Fig.16 It is a front view and a cross-sectional structure diagram of the core collection of the sixth embodiment of the present invention.

[0068] Fig.17 It is a front view and a cross-sectional structure diagram of the sixth core of the embodiment of the present invention.

[0069] Fig.18 This is an exploded view of embodiment 7 of the present invention.

[0070] Fig.19 It is a front view and a cross-sectional structure diagram of the core collection of the seventh embodiment of the present invention.

[0071] Fig. 20 It is a front view and cross-sectional structure diagram of a core according to embodiment 7 of the present invention.

[0072] Fig.21 This is an exploded view of embodiment 8 of the present invention.

[0073] Fig. 22 It is a front view and a cross-sectional structure diagram of the core collection of the eighth embodiment of the present invention.

[0074] Fig.23 It is a front view and cross-sectional structure diagram of a core of Embodiment 8 of the present invention.

[0075] Fig.24 This is an exploded view of embodiment 9 of the present invention.

[0076] Fig.25It is a front view and a cross-sectional structure diagram of the core collection of the ninth embodiment of the present invention.

[0077] Fig.26 It is a front view and cross-sectional structure diagram of a core according to the ninth embodiment of the present invention.

[0078] Fig. 27 This is a partial enlarged view of point A of embodiment 9 of the present invention.

[0079] Fig.28 It is a front view and a cross-sectional structure diagram of the core collection of the tenth embodiment of the present invention.

[0080] Fig.29 It is a front view and a cross-sectional structure diagram of a core according to the tenth embodiment of the present invention.

[0081] Fig.30 It is a front view and a cross-sectional structure diagram of the core collection of the eleventh embodiment of the present invention.

[0082] Fig.31 It is a front view and a cross-sectional structure diagram of the core output according to the eleventh embodiment of the present invention.

[0083] Fig.32 It is a front view and a cross-sectional structure diagram of the core collection of the twelfth embodiment of the present invention.

[0084] Fig.33 It is a front view and a cross-sectional structure diagram of a core output according to the twelfth embodiment of the present invention.

[0085] Fig.34 It is a front view and a cross-sectional structure diagram of the core collection of the thirteenth embodiment of the present invention.

[0086] Fig.35 It is a front view and a cross-sectional structure diagram of a core output according to the thirteenth embodiment of the present invention.

[0087] Fig.36 It is a front view and a cross-sectional structure diagram of the core collection of the fourteenth embodiment of the present invention.

[0088] Fig.37 It is a front view and cross-sectional structure diagram of a core output according to a fourteenth embodiment of the present invention.

[0089] Fig.38 This is an exploded view of the fifteenth embodiment of the present invention.

[0090] Fig.39 It is a front view and a cross-sectional structure diagram of the core collection of the fifteenth embodiment of the present invention.

[0091] Fig.40 It is a front view and a cross-sectional structure diagram of a core according to the fifteenth embodiment of the present invention.

[0092] Fig.41It is a front view and a cross-sectional structure diagram of the core collection of the sixteenth embodiment of the present invention.

[0093] Fig.42 It is a front view and a cross-sectional structure diagram of a sixteen-core according to an embodiment of the present invention.

[0094] Fig.43 It is a front view and a cross-sectional structure diagram of the seventeenth embodiment of the present invention.

[0095] Fig.44 It is a front view and cross-sectional structure diagram of the core of the seventeenth embodiment of the present invention.

[0096] Fig.45 This is an exploded view of the eighteenth embodiment of the present invention.

[0097] Fig.46 It is a front view and a cross-sectional structure diagram of a core output according to the eighteenth embodiment of the present invention.

[0098] Fig.47 This is an exploded view of the nineteenth embodiment of the present invention.

[0099] Fig.48 It is a front view and a cross-sectional structural diagram of the core collection of the nineteenth embodiment of the present invention.

[0100] Fig.49 It is a front view and cross-sectional structure diagram of a core output according to the nineteenth embodiment of the present invention.

[0101] Fig.50 This is an exploded view of embodiment 20 of the present invention.

[0102] Fig.51 It is a front view and a cross-sectional structure schematic diagram of the core collection of embodiment 20 of the present invention.

[0103] Fig.52 It is a front view and a cross-sectional structure schematic diagram of the core of Example 20 of the present invention.

[0104] Fig.53 This is a partial enlarged view of the Z position of the twenty-second embodiment of the present invention.

[0105] Description of the numbers in the figure: 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 limit boss, 3Z movable counterweight part, 4 reset part, 5 writing tool body, 61 holding slope, 62 holding rod, 621 holding boss, 63 engagement gentle slope, 64 limit gentle slope. DETAILED DESCRIPTION Specific embodiment 1

[0106] See also Figure 1-Figure 3 A gravity retractable pen comprises a retractable writing sleeve rod, a limiter 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 with each other.

[0107] The writing tool body 5 is located in the writing sleeve rod. Through the extension and retraction of the writing sleeve rod, the writing tool body 5 has two position changes in the writing sleeve rod: core collection and core extraction.

[0108] The reset member 4 is arranged between the writing tool body 5 and the lower sleeve rod 1, and provides continuous elastic force for the telescopic reset between the lower sleeve rod and the upper sleeve rod, that is, the core retraction.

[0109] When the core is ejected, a temporary engaging state is formed between the lower sleeve rod 1 and the upper sleeve rod 2, and the temporary engaging state formed between the lower sleeve rod 1 and the upper sleeve rod 2 is limited by the limiting member 3, so that the limiting member 3, the lower sleeve rod 1 and the upper sleeve rod 2 form a stable matching state in the writing state, which is the core ejecting state at this time.

[0110] When the limiting member 3 is displaced and / or rotated a certain distance due to 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. 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.

[0111] 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. A pair of strip-shaped slide grooves are provided on both sides of the lower sleeve rod 1. The limit member 3 is a strip-shaped block that can move up and down inside the slide groove. The limit member 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 matching end 21, so that the matching end 21 and the matching end 11 are more tightly engaged, thereby achieving the purpose of core locking.

[0112] There are two situations in which the position change between the matching end 21 and the mating end 11 occurs: When the limiting member 3 does not apply gravity to the mating end 11, the clamping force formed between the matching end 21 and the matching end 11 is smaller than the restoring force of the restoring member 4, and the restoring member 4 forces the mating end 11 to return to below 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 retracted state.

[0113] When the stopper 3 is pressed on the mating end 11, it will exert additional gravity and / or stopper force on the mating end 11, and the sum of the additional gravity, stopper force, and the engagement force formed between the mating end 21 and the mating end 11 is greater than the reset force, so that the mating end 11 is kept above the mating end 21, and the writing tool body 5 is kept exposed from the lower sleeve rod 1, which is the core-out state.

[0114] 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 the engagement being too tight and difficult to collect the core, and avoiding the engagement being too loose and causing the locking to be insufficiently tight after the core is taken out, resulting in an unstable writing state, which affects the writing experience.

[0115] A gripping slope 61 and a gripping rod 62 are also provided between the lower sleeve rod 1 and the upper sleeve rod 2, and a gripping boss 621 is also provided on the gripping rod 62. The gripping slope 61 and the gripping rod 62 are respectively provided on the lower sleeve rod 1 and the upper sleeve rod 2. When the pen is in the core-out state, the limiter 3 is located between the bottom of the gripping slope 61 and the top of the matching end 11. After the gripping rod 62 is gripped, the gripping boss 621 squeezes the gripping slope 61 to generate a force that squeezes the limiter 3 downward, so that the limiter 3 squeezes the matching end 11 downward inside the strip slide groove, so that the matching end 11 and the matching end 21 are more tightly engaged. At the same time, during the gripping process, the limiter 3 will not be squeezed by the gripping rod 62 and will not be unable to resist the reset force generated by the reset member 4 due to the short-term deviation of the pen, resulting in the core being retracted, thereby improving the writing experience.

[0116] The upper sleeve rod 2 and the lower sleeve rod 1 are detachably connected by engaging the matching end 21 with the mating end 11. The upper sleeve rod 2 and the lower sleeve rod 1 can be designed to be assembled from multiple separate parts. This design can easily replace the writing tool body or perform production and assembly, improve production efficiency, reduce assembly time, and also improve the user experience during use. Figure 2 The top of the upper sleeve rod 2 is provided with a rod cap which is detachable by means of threads or the like and contacts with the writing tool body 5 .

[0117] 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 will be 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 slide groove, so that the mating end 11 and the matching end 21 are more tightly engaged. When the pen is in a flat state, when the gravity direction and the restoring force direction of the limiter 3 are offset, the clamping force between the mating end 11 and the matching end 21 plus the limiter 3 offset in the gravity direction are insufficient to resist the restoring force generated by the restoring member 4, causing the mating end 11 to return to the bottom of 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. Specific embodiment 2

[0118] See also Figure 4-Figure 6 A gravity refill pen comprises a retractable writing sleeve rod, a limiting member 3 and a writing tool body 5.

[0119] The writing sleeve rod comprises a lower sleeve rod 1 and an upper sleeve rod 2 which are sleeved with each other. The lower sleeve rod 1 is telescopic relative to the upper sleeve rod 2 along the axial direction.

[0120] The writing tool body 5 is located inside the writing sleeve.

[0121] 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 arranged on the lower sleeve rod 1 and the upper sleeve rod 2.

[0122] The stopper 3 is arranged inside the upper sleeve rod 2 to move up and down and / or rotate, and the engaging state of the mating end 11 and the matching end 21 is maintained by its own gravity.

[0123] The resetting member 4 is arranged between the writing tool body 5 and the lower sleeve rod 1, and provides continuous elastic force for the telescopic resetting between the lower sleeve rod and the upper sleeve rod, that is, the core retraction.

[0124] The limit member 3 is an annular member and is sleeved inside the upper sleeve rod 2. The limit member 3 can move up and down after the sleeve and the lower part is located above the mating end 11. The lower part is wedged into the side of the mating end 11 close to the axis center, and 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, thereby achieving the purpose of core locking.

[0125] The upper sleeve rod 2 is provided with several strip-shaped notches near the head of the lower sleeve rod 1 to increase the deformation capacity. After holding, the head of the upper sleeve rod 2 contacts the outer wall of the lower sleeve rod 1 inwardly, and the gripping force can further increase the friction to prevent the writing tool body 5 from shrinking under the action of the reset member 4.

[0126] There are two situations in which the position change between the matching end 21 and the mating end 11 occurs: When the limiting member 3 does not apply gravity to the mating end 11, the clamping force formed between the matching end 21 and the matching end 11 is smaller than the restoring force of the restoring member 4, and the restoring member 4 forces the mating end 11 to return to below 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 retracted state.

[0127] When the stopper 3 is pressed on the mating end 11, it will exert additional gravity and / or stopper force on the mating end 11, and the sum of the additional gravity, stopper force, and the engagement force formed between the mating end 21 and the mating end 11 is greater than the reset force, so that the mating end 11 is kept above the mating end 21, and the writing tool body 5 is kept exposed from the lower sleeve rod 1, which is the core-out state.

[0128] The mating end 11 and the matching end 21 are provided with a snap-fitting gentle slope 63, which can control the snap-fitting force between the matching end 21 and the mating end 11, and maintain the stability of the pen's core-out state. By adjusting the angle or height of the snap-fitting gentle slope 63, the balance between the snap-fitting force and the reset force can also be adjusted, so as to better realize the writing function of the pen. At the same time, the design of the snap-fitting gentle slope 63 can also improve the stability and reliability of the pen, reduce the fluctuation of the snap-fitting force and the occurrence of abnormal situations, and at the same time can guide the radial inward deformation or circumferential outward deformation of the mating end 11. Specific embodiment three

[0129] See also Figure 7-Figure 9 A gravity refill pen comprises a retractable writing sleeve rod, a limiting member 3 and a writing tool body 5.

[0130] The writing sleeve rod comprises a lower sleeve rod 1 and an upper sleeve rod 2 which are sleeved with each other. The lower sleeve rod 1 is telescopic relative to the upper sleeve rod 2 along the axial direction.

[0131] The writing tool body 5 is located inside the writing sleeve.

[0132] 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.

[0133] The limiter 3 is sleeved on 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 abuts against the mating end 11 to prevent the mating end 11 from circumferential deformation and maintain a clamping state with the matching end 21.

[0134] The resetting member 4 is arranged between the writing tool body 5 and the lower sleeve rod 1, and provides continuous elastic force for the telescopic resetting between the lower sleeve rod and the upper sleeve rod, that is, the core retraction.

[0135] The limit member 3 is an annular member and is sleeved on the outside of the upper sleeve rod 2. The limit member 3 can move up and down after the sleeve and is located above the mating end 11. The lower part is wedged into the side of the mating end 11 away from the axis center. 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 engaging area of ​​the matching end 21, so that the matching end 21 and the matching end 11 are more tightly engaged, thereby achieving the purpose of core locking.

[0136] The outer wall of the upper sleeve rod 2 near the lower sleeve rod 1 is an inclined surface for increasing deformation capacity. After gripping, the head of the lower sleeve rod 1 contacts the outer wall of the upper sleeve rod 2 inwardly, and the gripping force can further increase friction to prevent the writing tool body 5 from shrinking under the action of the reset member 4.

[0137] There are two situations in which the position change between the matching end 21 and the mating end 11 occurs: When the limiting member 3 does not apply gravity to the mating end 11, the clamping force formed between the matching end 21 and the matching end 11 is smaller than the restoring force of the restoring member 4, and the restoring member 4 forces the mating end 11 to return to below 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 retracted state.

[0138] When the stopper 3 is pressed on the mating end 11, it will exert additional gravity and / or stopper force on the mating end 11, and the sum of the additional gravity, stopper force, and the engagement force formed between the mating end 21 and the mating end 11 is greater than the reset force, so that the mating end 11 is kept above the mating end 21, and the writing tool body 5 is kept exposed from the lower sleeve rod 1, which is the core-out state.

[0139] A control boss 31 is also provided on the inner side of the limiting member 3. The control boss 31 cooperates with the matching 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.

[0140] The upper sleeve rod 2 is provided with an upper sleeve rod limiting boss 22 for limiting excessive downward movement of the limiter 3. The limiter 3 may also be provided with a counterweight limiting boss 32. The upper sleeve rod limiting boss 22 and the counterweight limiting boss 32 cooperate to better limit excessive downward movement of the limiter, avoid excessive blocking of the limiter by the matching end 11 and the matching end 21 during the core ejection, reduce the failure rate during the core ejection, and improve the success rate of the writing operation. Specific embodiment 4

[0141] See also Figure 10-11 A gravity refill pen comprises a retractable writing sleeve rod, a limiting member 3 and a writing tool body 5.

[0142] The writing sleeve rod comprises a lower sleeve rod 1 and an upper sleeve rod 2 which are sleeved with each other. The lower sleeve rod 1 is telescopic relative to the upper sleeve rod 2 along the axial direction.

[0143] The reset member 4 is a spring The writing tool body 5 is located inside the writing sleeve.

[0144] 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 arranged on the lower sleeve rod 1 and the upper sleeve rod 2.

[0145] The stopper 3 is arranged inside the upper sleeve rod 2 to move up and down and / or rotate, and the engaging state of the mating end 11 and the matching end 21 is maintained by its own gravity.

[0146] The resetting member 4 is arranged between the writing tool body 5 and the lower sleeve rod 1, and provides continuous elastic force for the telescopic resetting between the lower sleeve rod and the upper sleeve rod, that is, the core retraction.

[0147] The limit member 3 is an annular member and is sleeved inside the upper sleeve rod 2. The limit member 3 can move up and down after the sleeve and the 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 engagement 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.

[0148] There are two situations in which the position change between the matching end 21 and the mating end 11 occurs: When the limiting member 3 does not apply gravity to the mating end 11, the clamping force formed between the matching end 21 and the matching end 11 is smaller than the restoring force of the restoring member 4, and the restoring member 4 forces the mating end 11 to return to below 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 retracted state.

[0149] When the stopper 3 is pressed on the mating end 11, it will exert additional gravity and / or stopper force on the mating end 11, and the sum of the additional gravity, stopper force, and the engagement force formed between the mating end 21 and the mating end 11 is greater than the reset force, so that the mating end 11 is kept above the mating end 21, and the writing tool body 5 is kept exposed from the lower sleeve rod 1, which is the core-out state.

[0150] The inner wall diameter of the upper sleeve rod 2 gradually increases from bottom to top to form a trigger slope 23. The trigger slope 23 can make the limiter 3 easier to break away from the contact state with the mating end 11 due to the gradually increasing diameter of the inner wall of the upper sleeve rod 2 when the pen is placed flat, so that the clamping force formed between the matching end 21 and the mating end 11 is smaller than the reset force of the reset member 4, and then the writing tool body 5 is completely retracted inside the lower sleeve rod 1, triggering the retraction of the writing tool. The trigger slope 23 can be clamped with the outer wall of the limiter 3 when the pen is tilted or placed vertically in use, and the limiter 3 moves downwards and becomes tighter, increasing friction to keep the pen in the retracted state.

[0151] The inner 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, so that the slopes conflict with each other to increase friction, thereby increasing the probability of the mating end 11 and the matching end 21 being unable to disengage. Specific embodiment five

[0152] See also Figure 12-14 A gravity retractable pen comprises a retractable writing sleeve rod, a limiter 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 with each other.

[0153] The writing tool body 5 is located in the writing sleeve rod. Through the extension and retraction of the writing sleeve rod, the writing tool body 5 has two position changes in the writing sleeve rod: core collection and core extraction.

[0154] The resetting member 4 is arranged between the writing tool body 5 and the lower sleeve rod 1, and provides continuous elastic force for the telescopic resetting between the lower sleeve rod and the upper sleeve rod, that is, the core retraction.

[0155] When the core is ejected, a temporary engaging state is formed between the lower sleeve rod 1 and the upper sleeve rod 2, and the temporary engaging state formed between the lower sleeve rod 1 and the upper sleeve rod 2 is limited by the limiting member 3, so that the limiting member 3, the lower sleeve rod 1 and the upper sleeve rod 2 form a stable matching state in the writing state, which is the core ejecting state at this time.

[0156] 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. In order to better control the limit member and prevent it from excessively moving downward so that the lower sleeve rod 1 cannot perform axial telescopic activities, an upper sleeve rod limiting boss 22 is provided on the upper sleeve rod 2 to limit the limit member 3 from excessively moving downward. 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 excessively moving downward, thereby avoiding the limit member from excessively blocking the formation of a temporary mating state between the mating end 11 and the matching end 21 when the core is ejected, thereby reducing the failure rate when the core is ejected and improving the success rate of the writing operation.

[0157] There are two situations in which the position change between the matching end 21 and the mating end 11 occurs: When the limiting member 3 does not apply gravity to the mating end 11, the clamping force formed between the matching end 21 and the matching end 11 is smaller than the restoring force of the restoring member 4, and the restoring member 4 forces the mating end 11 to return to below 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 retracted state.

[0158] When the stopper 3 is pressed on the mating end 11, it will exert additional gravity and / or stopper force on the mating end 11, and the sum of the additional gravity, stopper force, and the engagement force formed between the mating end 21 and the mating end 11 is greater than the reset force, so that the mating end 11 is kept above the mating end 21, and the writing tool body 5 is kept exposed from the lower sleeve rod 1, which is the core-out state.

[0159] The mating end 11 and the core outlet inner platform 21 are provided with a snap-fitting slope 63, which 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.

[0160] In order to better adjust the limiting effect of the limiting member on the lower sleeve rod, a limiting gentle slope 64 is provided on the matching end 11 and the limiting member 3. The limiting force between the matching end 11 and the limiting member 3 is adjusted by controlling the angle of the limiting gentle slope 64.

[0161] In order to reduce the difficulty of processing, facilitate assembly and mass production, the upper sleeve rod 2 can be separated into an upper sleeve rod body 2A and a cover body 25. Specific embodiment six

[0162] See also Figure 15-17 A gravity refill pen comprises a retractable writing sleeve rod, a limiting member 3 and a writing tool body 5.

[0163] The writing sleeve rod comprises a lower sleeve rod 1 and an upper sleeve rod 2 which are sleeved with each other. The lower sleeve rod 1 is telescopic relative to the upper sleeve rod 2 along the axial direction.

[0164] The reset member 4 is a spring The writing tool body 5 is located inside the writing sleeve.

[0165] 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 arranged on the lower sleeve rod 1 and the upper sleeve rod 2.

[0166] The stopper 3 is arranged inside the upper sleeve rod 2 to move up and down and / or rotate, and the engaging state of the mating end 11 and the matching end 21 is maintained by its own gravity.

[0167] The resetting member 4 is arranged between the writing tool body 5 and the lower sleeve rod 1, and provides continuous elastic force for the telescopic resetting between the lower sleeve rod and the upper sleeve rod, that is, the core retraction.

[0168] In order to better control the limiter and prevent the limiter from excessively moving downward so that the lower sleeve rod 1 cannot perform axial telescopic activities, a counterweight limit boss 32 is further provided in the limiter 3, and an upper sleeve rod limiting boss 22 is provided on the upper sleeve rod 2. The upper sleeve rod limiting boss 22 cooperates with the counterweight limit boss 32 to limit the limiter 3 from excessively moving downward.

[0169] There are two situations in which the position change between the matching end 21 and the mating end 11 occurs: When the limiting member 3 does not apply gravity to the mating end 11, the clamping force formed between the matching end 21 and the matching end 11 is smaller than the restoring force of the restoring member 4, and the restoring member 4 forces the mating end 11 to return to below 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 retracted state.

[0170] When the stopper 3 is pressed on the mating end 11, it will exert additional gravity and / or stopper force on the mating end 11, and the sum of the additional gravity, stopper force, and the engagement force formed between the mating end 21 and the mating end 11 is greater than the reset force, so that the mating end 11 is kept above the mating end 21, and the writing tool body 5 is kept exposed from the lower sleeve rod 1, which is the core-out state.

[0171] The mating end 11 and the core outlet inner platform 21 are provided with a snap-fitting slope 63, which 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.

[0172] Sufficient space is reserved on both sides of the limiting member to facilitate the tipping of the limiting member (3), so that the core can be retracted by gravity when placed horizontally. When the pen is placed flat, the limiting member is separated from the mating end to trigger the core retraction, thereby achieving the effect of automatic core retraction. At the same time, in order to reduce the difficulty of processing, facilitate assembly and facilitate mass production, a writing tool limiting portion 26 is also provided in the upper sleeve rod 2. Specific embodiment seven

[0173] See also Figure 18-Figure 20 A gravity retractable pen comprises a retractable writing sleeve rod, a limiter 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 with each other.

[0174] 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 core retraction.

[0175] The writing tool body 5 is located in the writing sleeve rod. Through the extension and retraction of the writing sleeve rod, the writing tool body 5 has two position changes in the writing sleeve rod: core collection and core extraction.

[0176] When the core is ejected, a temporary engaging state is formed between the lower sleeve rod 1 and the upper sleeve rod 2, and the temporary engaging state formed between the lower sleeve rod 1 and the upper sleeve rod 2 is limited by the limiting member 3, so that the limiting member 3, the lower sleeve rod 1 and the upper sleeve rod 2 form a stable matching state in the writing state, which is the core ejecting state at this time.

[0177] 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. There are two situations in which the position change between the matching end 21 and the mating end 11 occurs: When the limiting member 3 does not apply gravity to the mating end 11, the clamping force formed between the matching end 21 and the matching end 11 is smaller than the restoring force of the restoring member 4, and the restoring member 4 forces the mating end 11 to return to below 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 retracted state.

[0178] When the stopper 3 is pressed on the mating end 11, it will exert additional gravity and / or stopper force on the mating end 11, and the sum of the additional gravity, stopper force, and the engagement force formed between the mating end 21 and the mating end 11 is greater than the reset force, so that the mating end 11 is kept above the mating end 21, and the writing tool body 5 is kept exposed from the lower sleeve rod 1, which is the core-out state.

[0179] The mating end 11 and the core outlet inner platform 21 are provided with a snap-fitting slope 63, which 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.

[0180] In order to better adjust the limiting effect of the limiting member on the lower sleeve rod, a limiting gentle 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 gentle slope 64, which is used to adjust the limiting force and gravity of the limiting member 3.

[0181] In order to prevent the telescopic sleeve rod from separating, 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. In order to reduce the difficulty of processing, facilitate assembly and mass production, the upper sleeve rod 2 can be separated into an upper sleeve rod body 2A and a cover body 25. Specific embodiment eight

[0182] See also Figure 21-23 A gravity refill pen comprises a retractable writing sleeve rod, a limiting member 3 and a writing tool body 5.

[0183] The writing sleeve rod comprises a lower sleeve rod 1 and an upper sleeve rod 2 which are sleeved with each other. The lower sleeve rod 1 is telescopic relative to the upper sleeve rod 2 along the axial direction.

[0184] The reset member 4 is an elastic structure, and is disposed 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, for the core retraction.

[0185] The writing tool body 5 is located inside the writing sleeve.

[0186] 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 arranged on the lower sleeve rod 1 and the upper sleeve rod 2.

[0187] The stopper 3 is arranged inside the upper sleeve rod 2 to move up and down and / or rotate, and the engaging state of the mating end 11 and the matching end 21 is maintained by its own gravity.

[0188] In order to better control the limiter and prevent the limiter from excessively moving downward so that the lower sleeve rod 1 cannot perform axial telescopic activities, a counterweight limit boss 32 is further provided in the limiter 3, and an upper sleeve rod limiting boss 22 is provided on the upper sleeve rod 2. The upper sleeve rod limiting boss 22 cooperates with the counterweight limit boss 32 to limit the limiter 3 from excessively moving downward.

[0189] There are two situations in which the position change between the matching end 21 and the mating end 11 occurs: When the limiting member 3 does not apply gravity to the mating end 11, the clamping force formed between the matching end 21 and the matching end 11 is smaller than the restoring force of the restoring member 4, and the restoring member 4 forces the mating end 11 to return to below 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 retracted state.

[0190] When the stopper 3 is pressed on the mating end 11, it will exert additional gravity and / or stopper force on the mating end 11, and the sum of the additional gravity, stopper force, and the engagement force formed between the mating end 21 and the mating end 11 is greater than the reset force, so that the mating end 11 is kept above the mating end 21, and the writing tool body 5 is kept exposed from the lower sleeve rod 1, which is the core-out state.

[0191] The mating end 11 and the core outlet inner platform 21 are provided with a snap-fitting slope 63, which 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.

[0192] In order to better adjust the limiting effect of the limiting member on the lower sleeve rod, a limiting gentle 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 gentle slope 64, which is used to adjust the limiting force and gravity of the limiting member 3.

[0193] The upper sleeve rod 2 is provided with an anti-slipping position 24, and the lower sleeve rod 1 is provided with an anti-slipping boss 12. The anti-slipping position 24 cooperates with the anti-slipping boss 12 to prevent the telescopic sleeve rod from slipping out easily. In order to reduce the difficulty of processing, facilitate assembly and mass production, the upper sleeve rod 2 can be separated into an upper sleeve rod body 2A and a cover body 25. Specific embodiment nine

[0194] See also Figure 24-Figure 27 A gravity retractable pen comprises a retractable writing sleeve rod, a limiter 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 with each other.

[0195] The resetting member 4 is arranged between the writing tool body 5 and the lower sleeve rod 1, and provides continuous elastic force for the telescopic resetting between the lower sleeve rod and the upper sleeve rod, that is, the core retraction.

[0196] The writing tool body 5 is located in the writing sleeve rod. Through the extension and retraction of the writing sleeve rod, the writing tool body 5 has two position changes in the writing sleeve rod: core collection and core extraction.

[0197] When the core is ejected, a temporary engaging state is formed between the lower sleeve rod 1 and the upper sleeve rod 2, and the temporary engaging state formed between the lower sleeve rod 1 and the upper sleeve rod 2 is limited by the limiting member 3, so that the limiting member 3, the lower sleeve rod 1 and the upper sleeve rod 2 form a stable matching state in the writing state, which is the core ejecting state at this time.

[0198] 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. There are two situations in which the position change between the matching end 21 and the mating end 11 occurs: When the limiting member 3 does not apply gravity to the mating end 11, the clamping force formed between the matching end 21 and the matching end 11 is smaller than the restoring force of the restoring member 4, and the restoring member 4 forces the mating end 11 to return to below 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 retracted state.

[0199] When the stopper 3 is pressed on the mating end 11, it will exert additional gravity and / or stopper force on the mating end 11, and the sum of the additional gravity, stopper force, and the engagement force formed between the mating end 21 and the mating end 11 is greater than the reset force, so that the mating end 11 is kept above the mating end 21, and the writing tool body 5 is kept exposed from the lower sleeve rod 1, which is the core-out state.

[0200] The mating end 11 and the core outlet inner platform 21 are provided with a snap-fitting slope 63, which 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.

[0201] The limiting member 3 can be arranged in the writing sleeve rod in the following manner: In order to reduce the difficulty of processing, facilitate assembly and mass production, a cross bar 2D is further provided inside the upper sleeve rod 2, and one end of the limit member 3 is movably fixed on the cross bar 2D.

[0202] In order to reduce the friction between the limiting member and the writing sleeve rod and prolong the service life, the limiting member 3 adds a steel ball between the limiting member 3 and the writing sleeve rod.

[0203] A writing tool limiting portion 26 is also provided inside the upper sleeve rod 2 . Specific embodiment ten

[0204] See also Figure 28-Figure 29 The invention is a gravity retractable pen, which is different from the ninth embodiment in that the style of the limiter 3 is different, and the upper sleeve rod 2 is provided with an inner ring groove 2C, and the two ends of the limiter 3 are extended and arranged in the inner ring groove 2C. The limiter 3 can rotate in the annular groove, so that the gravity direction of the limiter 3 is perpendicular to the horizontal plane.

[0205] The mating ends 11 are evenly distributed in the circumferential direction, leaving open grooves, and the groove width is smaller than the width of the limiting member 3, so that the limiting member 3 can form a mating with the mating end 11 no matter where it is. Specific embodiment eleven

[0206] See also Figure 30-Figure 31A gravity refill pen is different from the tenth embodiment in that the style of the limit member 3 is different, and the way in which the limit member 3 is arranged in the writing sleeve rod is different. The upper sleeve rod 2 can be split into an upper sleeve rod body 2A and a cover body 25, and one end of the limit member 3 is movably fixed to the outer ring of the cover body 25. Specific embodiment 12

[0207] See also Figure 32-Figure 33 A gravity refill pen is provided, which differs from the eleventh embodiment in that the limit member 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 limit member 3 to prevent excessive downward movement. Specific embodiment 13

[0208] See also Figure 34-Figure 35 The invention relates to a gravity refill pen, which is different from the eleventh embodiment in that the limiting member 3 is arranged in a different manner in the writing sleeve rod, 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. The cover body 25 cooperates with the upper sleeve rod body 2A, so that the limiting member 3 can rotate but cannot move axially in a straight line. Specific embodiment 14

[0209] See also Figure 36-Figure 37 The invention relates to a gravity retractable pen, which is different from the fifth embodiment in that a multifunctional spring 2G with elasticity is further provided between the stopper 3 and the upper sleeve rod 2, and the two ends of the multifunctional spring 2G are respectively fixed to the stopper 3 and the upper sleeve rod 2. The elastic force of the multifunctional spring 2G is less than the gravity of the stopper 3, so that the spring is in an open state.

[0210] When the pen falls, the multifunctional spring 2G will change from an open state to a tightened state, so that the telescopic sleeve will 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 clamping 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 in the lower sleeve rod 1 and the upper sleeve rod 2, so as to achieve the purpose of automatically retracting the core to protect the writing tool body 5 when it falls. Specific embodiment 15

[0211] See also Figure 38-Figure 40 A gravity core collection pen is different from the fifth embodiment in that the matching end 11 and the core outlet inner platform 21 of the structure shown are placed in front, which reduces the total length of the product and controls the cost.

[0212] The lower sleeve rod 1 moves upward, driving the limit piece 3 to move, so that the upper sleeve rod 2 reaches between the lower sleeve rod 1 and the limit piece 3. The sum of the gravity and the limit force of the limit piece 3 and the limit force of the lower sleeve rod 1 is greater than the reset force of the reset piece 4, so that the core-outlet inner platform 21 and the matching end 11 are engaged, thereby realizing the core-outlet state.

[0213] When the structure is placed horizontally, the gravity direction of the limit member 3 is converted from axial to radial, so that the sum of the limiting force of the limit member 3 and the limiting force of the lower sleeve rod 1 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 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. Specific embodiment 16

[0214] See also Figure 41-42 A gravity core-collecting pen, which differs from the fifth embodiment in that the upper sleeve rod 1 is additionally provided with a pen clip, the core-exiting inner platform 21 is arranged on the pen clip, the trigger space for the matching end 11 and the core-exiting inner platform 21 is increased, 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 multifunctional 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, thereby reducing the gravity of the limiter (3), and in order to prevent the pen from being in a tilted writing state, the downward pressure is insufficient, resulting in the matching end and the matching end being unable to normally reach a good stable temporary matching state, the multifunctional spring is located between the limiter and the upper sleeve rod, and is in a slightly compressed state under normal conditions, providing a slight elastic force to the limiter. Specific embodiment 17

[0215] See also Figure 43-Figure 44 A gravity refill pen is different from the twelve embodiments in that the limiting member 3 is an annular structure, the core outlet inner platform 21 is arranged on the cover body 25, and the matching end 11 is deformed inwardly toward the axis to reduce the overall diameter. Specific embodiment 18

[0216] See also Figure 45-Figure 46 A gravity retractable pen is different from the fifth embodiment in that the volume of the limiter 3 is increased, so that the adjustable gravity range of the limiter 3 is increased, the deformation requirement of the mating end 11 is reduced, and the triggering difficulty is reduced. Specific embodiment 19

[0217] See also Figure 47-Figure 49 A gravity refill pen is provided, which is different from the eighteenth embodiment in that, in order to facilitate installation and improve production efficiency, the upper sleeve rod 2 can be split into an upper sleeve rod body 2A and a cover body 25.

[0218] In order to better realize the restriction of the matching end 11 by the limiting member 3 , the contact surfaces of the limiting member 3 and the matching end 11 are both arc surfaces, which increases the contact area and reduces the gravity requirement for the limiting member 3 .

[0219] In order to prevent the telescopic sleeve rod from separating, the lower sleeve rod 1 is provided with a control portion 1E toward the axis to control the maximum telescopic distance of the telescopic sleeve rod through the limitation of the control portion 1E and the writing tool limit portion 26. Specific embodiment 20

[0220] See also Figure 50-Figure 53 A gravity refilling pen is provided, which differs from the nineteenth embodiment in that a movable counterweight (3Z) is further provided inside the limiting member (3) for increasing the gravity of the limiting member (3) and providing 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 limiting member (3), thereby bringing an upward impact force to the limiting member (3), helping the limiting member (3) to better break away from the temporary mating state between the mating end and the matching end. At the same time, additional effects including sound, use experience, etc. can be provided in addition to the functions.

[0221] In the description of the present invention, it is necessary to understand that the above-mentioned displacement of the gravity direction and the reset force direction of the limit member 3 has an angle requirement, which does not mean that even a small displacement will cause reset. In actual application, the limit member 3 is allowed to have a certain angle of gravity displacement 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 limit member 3, or the slope of the limiting gentle slope 64 in Example 1 and other influencing factors in actual application.

[0222] 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-out engagement and core-in engagement disengagement requirements of the mating end 11 and the core inner ring 21 can be met, it will be sufficient.

[0223] The following are some additional explanations of the present invention: 1. When the pen holding area is arranged on the upper sleeve rod, when the limiter 3 is pressed on the mating end 11, it will exert additional gravity and / or limit force on the mating end 11. The sum of the additional gravity, limit force, and the engagement force formed between the mating end 21 and the mating end 11 is greater than the reset force. This makes the mating end 11 remain above the mating end 21, so that the writing tool body 5 remains exposed from the lower sleeve rod 1, which is the core-out state; If the pen holding area is provided on the lower sleeve rod, when the stopper 3 is pressed on the mating end 11, additional gravity and / or stopper force will be applied to the mating end 11. The sum of the additional gravity, stopper force, and the engagement force formed between the mating end 21 and the mating end 11 is greater than the sum of the reset force and the writing pressure. This causes the mating end 11 to remain above the mating end 21, and is used to keep the writing tool body 5 exposed from the lower sleeve rod 1, which is the core-out state.

[0224] 2. When the limiting gentle slope is not used, the limiting component only presses the mating end and / or the 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-functional spring to provide additional slight elastic force.

[0225] 3. The limiting gentle slope, the engaging gentle slope and the triggering slope may not only be flat slopes, but may also be curved surfaces, irregular surfaces or concave and convex surfaces.

[0226] 4. The limit slope can not only adjust the gravity influence of the limit part, but also can be used to adjust the limit force of the limit part.

[0227] 5. The mating end and / or matching end is deformable.

[0228] 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 being completely separated from each other through the limiting part of the writing tool; 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 be prevented from separating from each other through other existing limiting structures, while maintaining a state of movable and telescopic cooperation.

Claims

1. A gravity refill pen, characterized in that: It comprises a retractable writing sleeve rod, a stopper (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 retracted 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 the limiting member (3), the lower sleeve rod (1) and the upper sleeve rod (2) form a stable matching state in the writing state, and this is the core ejection state; When the limiting member (3) is displaced and / or rotated a certain distance due to 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 in that: 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 with each other; 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 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 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. A gravity refill pen according to claim 1, characterized in that: The writing sleeve rod is also 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 engagement 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 mating end (11) close to the axis, and is used to compress the mating 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 respectively provided between the lower sleeve rod (1) and the upper sleeve rod (2) 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 inside 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, spherical, semi-annular or special-shaped member, and is installed outside or inside the upper sleeve rod (2).

8. A gravity refill pen, characterized in that: 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 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 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); the side of the limiting member (3) close to the writing end of the writing tool body (5) abuts against the matching end (11) to prevent the matching end (11) from circumferential deformation and maintain a clamping 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 change between the matching end (21) and the mating end (11) occurs: 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 restoring force of the restoring member (4), and the restoring member (4) causes the mating end (11) to return to below 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 a core-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 matching end (21) and the mating end (11) is greater than the reset force; The mating end (11) is urged to remain above the matching end (21) so that the writing tool body (5) remains 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: The mating end (11) and / or the matching end (21) is provided with a gentle engagement slope (63).

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), and the limiting gentle slope (64) 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 between the lower sleeve rod (1) and the upper sleeve rod (2) and is transmitted through the writing tool body (5); 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) may be replaced by a steel ball or a steel ball may 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 also provided with a movable limiting member (3Z) and / or has a weight sufficient to escape from the temporary fitting 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 inside 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 component (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 limiter (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 stopper (3) are arranged in the inner ring groove (2C); 5. A cross bar (2D) is also 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 also 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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