Gravity core pen

Abstract

This invention discloses a gravity-operated retractable pen, comprising an inner rod, an outer rod, a pen refill, and a return spring. The inner rod and the outer rod are slidably sleeved together. The pen refill is located inside the inner rod, and the return spring is sleeved on the outer end of the pen refill to provide a retractable retractable force. The tail end of the pen refill is provided with a movable gravity member. When the pen refill is extended, the gravity member overcomes the retractable force of the return spring with its own weight to keep the pen refill extended. It can also move away from the pen refill and generate a reaction force through its own weight to break the balance state of the extended pen refill and achieve automatic retractable pen refill. A pen refill holding mechanism is also provided between the inner rod and the outer rod to temporarily lock the pen refill in the balance state. When the balance state of the extended pen refill is broken, it is unlocked to allow the inner rod and the outer rod to move relative to each other to retract the pen refill. A mounting member is also provided between the tops of the inner rod and the outer rod. The mounting member is installed on the inner side of the outer rod and the upper part of the inner rod; or the mounting member is integrally formed with the outer rod as part of the outer rod.

Description

Technical Field

[0001] This invention relates to the field of pens, specifically a gravity-feed retractable pen. Background Technology

[0002] While existing writing instruments can meet the needs of daily writing, they still have some shortcomings and limitations. For example, most pens currently in use require manual pressing or pushing of the pen barrel to retract and extend the lead. Although extending the lead before writing is a step that writers usually do not neglect, they may forget to retract it after writing, especially when writing for a long time or when the writer needs to temporarily stop. This may result in staining clothes when the pen is accidentally touched, or damaging the pen tip if the pen is accidentally dropped, rendering the pen unusable. Summary of the Invention

[0003] The purpose of this invention is to provide a gravity-operated retractable pen to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a gravity-operated retractable pen, comprising an inner rod, an outer rod, a pen refill, and a return spring, wherein the inner rod and the outer rod are slidably sleeved together, the pen refill is located inside the inner rod, and the return spring is sleeved on the outer end of the pen refill to provide a retractable retractable force, characterized in that: a refill holding mechanism is provided between the inner rod and the outer rod to temporarily lock the pen refill in a balanced state, and to unlock the pen refill when the balanced state is broken so as to allow relative displacement of the inner rod and the outer rod to retract the pen refill.

[0005] The pen refill is also equipped with a movable gravity component at the end. When the pen refill is retracted, the component moves away from the pen refill and uses gravity and / or external force generated by its own weight to break the lead out and maintain a balanced state, thus achieving automatic lead retraction.

[0006] Preferably, the core-ejection holding mechanism includes a locking and reinforcing limiting member in the core-ejection holding balanced state.

[0007] Preferably, the gravity component is an impact component; the limiting component, mounting component, outer rod, and / or inner rod have an internally formed total impact stroke that allows the impact component to move freely along the pen length direction. The total impact stroke restricts the total impact direction of the impact component, preventing it from detaching and falling. When not writing, the impact component moves away from the pen lead during its total impact stroke; the impact force generated by the impact component's own weight overcomes the return spring force, achieving automatic return and retraction of the pen lead.

[0008] As a preferred method: when writing is required, the pen is forcefully swung downwards, and the impactor overcomes the spring force of the return spring through gravity or the combined action of gravity and lifting force, causing the pen lead to emerge; when using the pure gravity-based lead emergence function, the preferred methods are the force of the swing, the gravity of the impactor, and the spring force of the return spring; the spring force of the return spring should be as light as possible, while the gravity of the impactor can be relatively heavier; the force of the swing needs to be relatively large.

[0009] Preferably, the impactor is spherical, blocky, cylindrical, hollow, or annular.

[0010] Preferably, the core-retaining mechanism includes an outer groove located on the outer wall of the inner rod and a limiting boss located on the inner wall of the outer rod; the outer groove and the limiting boss engage when the core is ejected and disengage when the core is retracted.

[0011] Preferably, at least one limiting rod 1 is fixedly connected to the outer wall of the inner rod extending upward, and the outer groove is provided at the end of the limiting rod 1 away from the inner rod; a pair of limiting rods 2 are provided on the inner wall of the outer rod, the limiting rods 2 and the limiting rod 1 are staggered, and the limiting boss is provided at the top of the limiting rod 2.

[0012] Preferably, at least one limiting rod is fixedly connected to the outer wall of the inner rod extending upward. The limiting member is movably located at the top of the limiting rod. The top of the limiting rod has radial deformation capability under the action of external force, and the limiting member can movably squeeze the limiting rod to deform.

[0013] Preferably, the limiting member is spherical or disc-shaped, or is a structure formed integrally by a slider and a limiting block.

[0014] Preferably, the upper side of the limiting member is provided with a weight.

[0015] Preferably, a reset member is connected between the upper side of the limiting member and the outer rod. When the core is ejected, the elastic force of the reset member acts on the limiting member to strengthen the locking of the core ejection holding mechanism; when the core is retracted, the gravity member moves to overcome the elastic force of the reset member and unlock the core ejection holding mechanism.

[0016] Preferably, the core retaining mechanism includes a guide and a limiting part. The guide is disposed on the outer rod and forms a limiting channel with the limiting part for the limiting part to slide. The limiting part is fixedly connected to the inner rod through a limiting rod assembly.

[0017] The limiting member can move closer to or further away from the guide member under the changing direction of gravity of the gravity member. When it gets close to the guide member, the gap between the limiting member and the guide member is too small to allow the limiting part to pass through. When it moves away from the guide member, the gap becomes larger and the limiting part can pass through freely. The limiting rod assembly has radial displacement compensation capability that allows the limiting part to slide freely along the limiting channel.

[0018] Preferably, the limiting rod assembly includes a rod-shaped structure extending upward from the outer wall of the inner rod, with the limiting part located at the top of the rod-shaped structure. The rod-shaped structure has the ability to deform and compensate for radial displacement of the limiting part sliding freely along the limiting channel.

[0019] Preferably, the limiting rod assembly comprises a limiting arc-shaped block and a central rod extending upward from the upper end of the outer wall of the inner rod, the central rod having the ability to deform to compensate for radial displacement of the limiting part sliding freely along the limiting channel; or it comprises a limiting arc-shaped block and a central arc-shaped block extending upward from the upper end of the outer wall of the inner rod, the inner side of the central arc-shaped block having an installation groove for the limiting part to be movably installed, the radial displacement of the limiting part sliding freely along the limiting channel being compensated by the movable installation.

[0020] Preferably, the central arc-shaped block consists of a central inner plate integrally connected with the limiting arc-shaped block and a detachable arc-shaped outer plate. The arc-shaped outer plate is snapped onto the lower part of the outer periphery of the central inner plate, thereby forming an installation groove between the central inner plate and the arc-shaped outer plate.

[0021] Preferably, the guide is a core-ejecting boss, and the side of the core-ejecting boss facing the limiting member is a core-receiving guide surface, which is distributed at an angle to the limiting member.

[0022] Preferably, the limiting channel is a closed-loop structure around the guide member, or a linear structure.

[0023] Preferably, the outer rod is provided with a core-exiting guide slope, which is located on the upper side of the guide member and is in the opposite direction of inclination to the core-receiving guide surface.

[0024] Preferably, the inner rod and the outer rod have a limiting structure that allows the inner rod and the outer rod to slide relative to each other a certain distance when the core is extended / retracted.

[0025] As a further preferred embodiment, the limiting structure includes at least one set of combined structures that are respectively disposed on the inner rod or the outer rod and slide through the cooperation of the outer wall protrusion and the limiting groove; or at least one set of combined structures that are respectively disposed on the inner rod or the outer rod and slide through the cooperation of the hook and the groove.

[0026] As a further preferred embodiment: when the total impact stroke is inside the outer rod, the diameter of the cavity wall cross section gradually increases towards the side away from the pen refill, forming an auxiliary slope.

[0027] As a further preferred option: a mounting component is detached from the outer rod, and the mounting component is a separate accessory that can be detachably installed on the outer rod; or the mounting component is integrally formed with the outer rod.

[0028] As a further preferred embodiment: the mounting component includes a fixing component, which is detachably and slidably installed on the inner wall of the outer rod; or the fixing component is integrally connected, snap-fitted, or threadedly connected to the inner wall of the outer rod.

[0029] As a further preferred embodiment: when the fixing member is detachably and slidably installed on the inner wall of the outer rod; the mounting member includes a sliding protrusion provided inward at the tail of the outer rod, and a limiting groove is provided on the outer periphery of the fixing member, with the sliding protrusion slidably connected in the limiting groove.

[0030] As a further preferred embodiment: the bottom end of the mounting component is provided with a pair of insert rods, and the inner wall of the outer rod is fixedly connected with a pair of slot seats, and the slot seats are inserted into the insert rods, with the pen refill located on the lower side of the slot seats.

[0031] As a further preferred option: when the fixing component is integrally connected, snap-fitted or threaded to the inner wall of the outer rod; the fixing component is a pen plug or a blocking rod, and a partition seat is fixedly connected between the inner side walls of the outer rod. The upper and lower cavity walls of the total impact stroke are respectively composed of a pen plug or a blocking rod and a partition seat, and the pen core is located on the lower side of the partition seat.

[0032] As a further preferred embodiment: when the fixing member is integrally connected, snap-fitted, or threadedly connected to the inner wall of the outer rod, the mounting member further includes a sliding rod. When the sliding rod is slidably connected to the middle of the fixing member, the gravity member is a ring-shaped counterweight fitted around the outside of the sliding rod, and is movably installed between the sliding rod and the top of the fixing member to create a movement gap. The counterweight can move radially to push the sliding rod away from the pen refill. When the sliding rod is slidably connected to the side wall of the fixing member, the gravity member is a spherical counterweight, and is movably installed between the sliding rod and the top of the fixing member to create a movement gap. The counterweight can move radially to push the sliding rod away from the pen refill.

[0033] As a further preferred embodiment: the cross-sections of both the fixing member and the sliding rod near the counterweight are designed as inclined planes that gradually approach each other inward; when the counterweight is annular, the upper and lower ends of the counterweight are inclined planes that match the inclined planes. The length of the inclined plane on the fixing member is less than or equal to the length of the inclined plane on the sliding rod.

[0034] As a further preferred embodiment, the mounting component further includes a tail piece, which is detachably connected to the lower end of the fixing component as the lower part of the fixing component. The tail piece has hooks on both side walls, and the fixing component has holes on both side walls corresponding to the hook positions, so that when moving axially, the hooks can engage with the holes for a detachable connection.

[0035] As a further preferred embodiment, the reset element is a spring, an elastic structure, or an elastic material.

[0036] Compared with existing technologies, the beneficial effects of this invention are as follows: 1. By setting a movable gravity component, the gravity of the gravity component enables automatic core retraction by overcoming the elastic force of the return spring in the non-writing state, preventing the core from being forgotten to be retracted. Furthermore, when the core is being extended for writing, the temporary locking mechanism further enhances the stability of the core extension. 2. The gravity component comes in different forms, providing multiple options for gravity manifestation. 3. By setting the total impact stroke or movement distance, different installation methods can be adopted for different shapes, such as internal installation and external installation, providing multiple impact modes and installation options. 4. Multiple options are provided for the core extension holding mechanism, such as temporary locking through the cooperation of a limiting boss and an outer groove, or temporary locking in different core extension and retraction states through the restriction of the limiting part by a guide component. 5. Multiple limiting structures are provided, such as the cooperation of an outer wall protrusion and a limiting groove, or the cooperation of a hook and a slot, to achieve relative sliding restriction between the inner and outer rods. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure at the core-receiving stage in Embodiment 1 of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the core during the core-gathering process in Embodiment 1 of the present invention; Figure 3 This is a three-dimensional cross-sectional view of the structure of the limiting member during core taking in according to Embodiment 2 of the present invention; Figure 4 This is a three-dimensional cross-sectional view of the core during the core-gathering process in Embodiment 2 of the present invention; Figure 5 This is a three-dimensional structural diagram of the core during the winding process in Embodiment 3 of the present invention; Figure 6 This is a three-dimensional cross-sectional view of the core during the core-gathering process in Embodiment 3 of the present invention; Figure 7 This is a schematic diagram of the dissected surface structure during core collection in Embodiment 3 of the present invention; Figure 8 This is a schematic cross-sectional view of the core during core extraction in Embodiment 4 of the present invention; Figure 9 This is a three-dimensional structural diagram of the core during the core-receiving process in Embodiment 5 of the present invention; Figure 10 This is a three-dimensional cross-sectional view of the core during the core-gathering process in Embodiment 5 of the present invention; Figure 11 This is a schematic diagram of the dissected surface structure of the upper part of the inner rod during core retraction in Embodiment 5 of the present invention; Figure 12 This is a schematic diagram of the dissected surface structure during core collection in Embodiment 5 of the present invention; Figure 13 This is a schematic diagram of the front (top) and cross-sectional (bottom) structure of the core during the core collection process in Embodiment 6 of the present invention (arrows indicate the direction of movement); Figure 14 This is a three-dimensional half-section diagram and an enlarged diagram of the core extraction structure in Embodiment 6 of the present invention; Figure 15 This is a cross-sectional view and an enlarged view of the core extraction process in Embodiment 7 of the present invention; Figure 16 This is a schematic diagram of the front (left) and cross-sectional (right) structure of Embodiment 8 of the present invention during core extraction; Figure 17 This is a three-dimensional exploded view of the core during core extraction in Embodiment 8 of the present invention; Figure 18 This is a three-dimensional exploded half-section diagram of the core ejection process in Embodiment 8 of the present invention; Figure 19 This is a schematic diagram of the front (left) and cross-sectional (right) structure of Embodiment 9 of the present invention during core extraction; Figure 20 This is a schematic diagram illustrating the state structure of the limiting boss and the outer groove during core ejection (left) and core retraction (right) in Embodiment 9 of the present invention; Figure 21 This is a three-dimensional exploded half-section diagram of the core ejection process in Embodiment 9 of the present invention; Figure 22 This is a structural schematic diagram of the cross-section (left) and front (right) of Embodiment 10 of the present invention during core extraction; Figure 23 This is a three-dimensional exploded half-section diagram of the core during core extraction in Embodiment 10 of the present invention; Figure 24 This is a three-dimensional exploded half-section diagram showing the pen lead installation position when the lead is ejected in Embodiment 10 of the present invention; Figure 25 This is a three-dimensional exploded half-section diagram of the inner rod and mounting component during core extraction in Embodiment 10 of the present invention; Figure 26 This is a schematic diagram showing the installation relationship between the inner rod and the mounting component during core extraction in Embodiment 10 of the present invention; Figure 27 This is a three-dimensional exploded view of the inner rod and mounting component during core extraction in Embodiment 10 of the present invention; Figure 28 This is a schematic diagram of the front left and cross-sectional right sides of Embodiment 11 of the present invention during core extraction; Figure 29 This is a three-dimensional exploded half-section diagram of the core extraction process in Embodiment 11 of the present invention; Figure 30 This is a three-dimensional exploded half-section diagram of the core during core extraction in Embodiment 11 of the present invention; Figure 31 This is a three-dimensional structural diagram of the core during the core extraction process in Embodiment 11 of the present invention from another direction; Figure 32This is a schematic diagram of the structure of the mounting component in Embodiment 11 of the present invention; Figure 33 This is a three-dimensional exploded half-section diagram of the core during the core collection process in Embodiment 12 of the present invention; Figure 34 This is a three-dimensional exploded half-section diagram of another embodiment of the present invention during core collection; Figure 35 This is a schematic diagram of the structure of the pen refill and the limiting rod assembly when they collide during the refilling process in Embodiment 12 of the present invention; Figure 36 This is a cross-sectional left and front right structural diagram of Embodiment 13 of the present invention during core extraction; Figure 37 This is a three-dimensional exploded half-section diagram of the core during the core collection process in Embodiment 13 of the present invention; Figure 38 This is a three-dimensional structural diagram of the core during the core-taking process in Embodiment 13 of the present invention; Figure 39 This is a three-dimensional exploded view of the mounting component during core taking-up in Embodiment 13 of the present invention; Figure 40 This is a schematic diagram showing the position of the pen refill tip during the refilling process in Embodiment 13 of the present invention; Figure 41 This is a three-dimensional sectional exploded view of the core during the core collection process in Embodiment 14 of the present invention; Figure 42 This is a three-dimensional exploded half-section diagram of the mounting part during core taking in according to Embodiment 14 of the present invention; Figure 43 This is an exploded cross-sectional view of the mounting groove during core taking in according to Embodiment 14 of the present invention. Figure 44 This is a schematic diagram of the limiting part during core taking in according to Embodiment 14 of the present invention; Figure 45 This is a schematic diagram of the mounting component during core taking in according to Embodiment 14 of the present invention; Figure 46 This is a schematic diagram of the position of the pen refill end when the pen refill is retracted in Embodiment 14 of the present invention.

[0038] In the picture: 1 Inner rod, 1-1 Rubber sleeve, 11 Limiting rod one, 12 Limiting rod assembly, 111 Outer groove, 2 Outer rod, 2-1 Pen clip, 21 Limiting rod two, 211 Limiting boss, 2120 Insert rod, 2121 Slot seat, 2122 Partition seat; 3 pen refills; 4. Return spring; 5 Impact component, 51 Limiting component, 52 Filler component, 53 Reset component, 54 Weighting component; 6 mounting parts, 60 storage holes, 61 fixing parts, 611 holes, 6-1 sliding protrusions, 6-2 limiting grooves, 62 sliding rods, 63 tail pieces, 631 hooks; 71 Outer wall protrusion, 72 Limiting groove, 710 Hook, 720 Slot; 8 counterweights; 91 Guide component, 92 Limiting part, 920 Mounting groove, 921 Core exit guide slope; 1a Lower inner rod, 1b Upper inner rod; Q is the total impact stroke, P is the movement distance, M is the outer rod impact stroke, and N is the limit impact stroke. Detailed Implementation

[0039] The present invention will now be further described with reference to the accompanying drawings. Example

[0040] Please see Figures 1-2 This invention provides a dual-control pen technology solution: a gravity-operated retractable pen, comprising an inner rod 1, an outer rod 2, a pen refill 3, a return spring 4, and a mounting component 6. The inner rod 1 is slidably telescopically sleeved on the inner side of the outer rod 2. The outer wall of the inner rod 1 and the inner wall of the outer rod 2 are respectively provided with limiting grooves 72 and outer wall protrusions 71, which cooperate to keep the inner rod 1 and the outer rod 2 sliding relative to each other for a certain distance and are not easy to rotate relative to each other or to disengage. The return spring 4 is sleeved between the front part of the pen refill 3 and the inner side of the inner rod 1 to provide the retractable retractable force; the mounting component 6 is a pen plug.

[0041] A pair of limiting rods 11 extend upward from the outer wall of the inner rod 1, and an outer groove 111 is provided on the outer periphery of the top of the limiting rods 11. The upper edge of the limiting groove 72 on the outer wall of the inner rod 1 can also be generated by the lower end of the limiting rods 11 protruding from the outer wall of the inner rod 1.

[0042] The inner wall of the outer rod 2 is provided with a limiting boss 211 that matches the outer groove 111 of the limiting rod 11. Both the outer groove 111 and the side wall of the limiting boss 211 are provided with slopes, so the top of the limiting rod 11 can easily move upward and flip over the limiting boss 211, so that the limiting boss 211 enters the outer groove 111. The top of the limiting rod 11 has the ability to deform in the circumferential direction.

[0043] The inner wall of the outer rod 2 is provided with a pair of limiting rods 21 protruding from it. The limiting rods 21 and the limiting rods 11 are staggered. A partition seat 2122 is fixed in the middle of the pair of limiting rods 21. The inner rod 1 is located between the pair of limiting rods 21. The pen refill 3 is located between the pair of limiting rods 11. The top of the pen refill 3 abuts against the partition seat 2122 through the filler 52.

[0044] A pen clip 2-1 is provided on the outer side of the top of the outer rod 2. A movable limiting member 51 is provided between the mounting member 6 and the limiting boss 211. The weight of the limiting member 51 can push the top of the limiting rod 11 outward when the limiting boss 211 is located in the outer groove 111, thereby preventing the limiting boss 211 and the outer groove 111 from easily separating and making the core output more stable. Corresponding limiting steps are provided at the same horizontal position as the limiting boss 211 on the inner wall of the limiting rod 21 to prevent the limiting member 51 from moving excessively. The mounting member 6 is installed on the top of the outer rod 2, which can be a snap-fit ​​installation. An impact stroke Q is formed between the mounting member 6 and the partition seat 2122. An impact member 5 moves inside the impact stroke Q and is located below the limiting member 51. In this embodiment, both the limiting member 51 and the impact member 5 are spherical. The diameter of the limiting member 51 is larger than that of the impact member 5, and the impact member 5 can pass over the limiting step.

[0045] When retracting the pen, hold the inner rod 1 and swing the pen out horizontally or upside down. The impact member 5 and the limiting member 51 move away from the pen refill 3, causing the outer rod 2 to move away from the pen refill 3. At the same time, the return spring 4 presses against the pen refill 3, causing the pen refill 3 to move upward and push the filling member 52, the spacer seat 2122, and the outer rod 2 to move upward relative to the inner rod 1 to retract the pen. During this process, because the limiting member 51 moves away, the limiting member 51 does not deform against the outer groove 111. Therefore, when the return spring 4 presses against the pen refill 3, the inner limiting protrusion 211 of the outer rod 2 can easily slide from the outer groove 111 past the top of the limiting rod 11 and be located on the upper side of the inner rod 1 for easy retraction. Alternatively, the pen clip 2-1 can be pushed from the side to move the outer rod 2 upward, while the return spring 4 presses against the pen refill 3, causing the pen refill 3 to move upward and push the filling member 52 to reset, thus retracting the pen.

[0046] When the pen tip is ejected, hold the inner rod 1 and hold the pen upright in the writing position. Under the action of gravity, the impactor 5 moves down and hits the baffle 2122 on the bottom wall of the impact total stroke Q cavity, which drives the outer rod 2 to move down. The filling part 52 pushes the pen tip 3 down to overcome the elasticity of the return spring 4 and expose the pen tip, thus ejecting the pen tip. The limiting boss 211 moves with the outer rod 2, passes over the top of the limiting rod 11 and enters the outer groove 111. The limiting part 51 moves down to the top of the limiting rod 11 and makes its circumferential shape change outward, so that the outer groove 111 and the limiting boss 211 are more firmly engaged to keep the pen tip ejected. Alternatively, hold the outer rod 2 and pull the inner rod 1 up to overcome the elasticity. The top of the limiting rod 11 passes over the limiting boss 211 and is placed on it. At the same time, under the action of gravity, the pen tip is kept ejected. Example

[0047] Please see Figures 3-4 The present invention provides a technical solution: the difference from embodiment 1 is that the mounting part 6 is not a pen stopper, but is composed of a blocking rod that does not completely seal the upper end of the outer rod 2; it should be noted that the mounting part 6 can also be integrally formed with the outer rod 2, regarded as part of the outer rod 2, and does not exist independently, as long as it can block the limiting part 51 so that it does not completely detach. Example

[0048] Please see Figures 5-7 The present invention provides a technical solution: the difference from embodiment 1 is that there is no impact member 5 in this embodiment, and the fixing member 6 is a structure integrally formed with the outer rod 2 and the pen clip 2-1, which can be regarded as part of the top end of the outer rod 2. A storage hole 60 is provided on the outer rod 2 in a region between the fixing member 6 and the limiting boss 211. The storage hole 60 has an elastic expansion capability, which allows the limiting member 51 to be squeezed into the interior when force is applied, but it does not easily pass through and fall out.

[0049] When retracting the pen, hold the inner rod 1 and swing the pen out horizontally or upside down. The limiting member 51 moves away from the pen refill 3, causing the outer rod 2 to move away from the pen refill 3. At the same time, the return spring 4 presses against the pen refill 3, causing the pen refill 3 to move upward and push the filling member 52, the spacer seat 2122, and the outer rod 2 to move upward relative to the inner rod 1 to retract the pen. During this process, because the limiting member 51 moves away, the limiting member 51 does not deform by squeezing the outer groove 111. When the return spring 4 presses against the pen refill 3, the inner limiting protrusion 211 of the outer rod 2 can easily slide from the outer groove 111 past the top of the limiting rod 11 and be located on the upper side of the inner rod 1 for easy retraction. Alternatively, the pen clip 2-1 can be manually pushed from the side to move the outer rod 2 upward, while the return spring 4 presses against the pen refill 3, causing the pen refill 3 to move upward and push the filling member 52 to return to its original position to retract the pen.

[0050] When the pen tip is ejected, hold the inner rod 1 and hold the pen upright in the writing position. Under the action of gravity, the fixing part 6, which is an integral structure with the outer rod 2 and the pen clip 2-1, moves downward, causing the partition seat 2122 to move downward. The filling part 52 pushes the pen tip 3 downward, overcoming the elastic force of the return spring 4 to expose the pen tip and achieve the ejection of the pen tip. The limiting boss 211 moves with the outer rod 2, passes over the top of the limiting rod 11 and enters the outer groove 111. The limiting part 51 moves down to the top of the limiting rod 11, causing it to change circumferentially outward. Then the outer groove 111 and the limiting boss 211 are more firmly engaged to keep the pen tip ejected. Alternatively, hold the outer rod 2 and pull the inner rod 1 upward to overcome the elastic force. The top of the limiting rod 11 passes over the limiting boss 211 and is placed on it. At the same time, under the action of gravity of the limiting part 51, the pen tip is kept ejected. Example

[0051] Please see Figure 8 The present invention provides a dual-control pen technical solution: the difference from embodiment 1 is that a reset member 53 is fixedly connected between the limiting member 51 and the mounting member 6. The reset member 53 is composed of an elastic structure or elastic material. The elasticity of the reset member 53 ensures that the limiting member 51 will not shake arbitrarily when writing with a slight tilt, thus affecting the retention of the lead and making the lead more stable. However, it can retract the lead when the pen is thrown out and placed horizontally to a certain extent or inverted.

[0052] The pen is inverted and the pen is used to impact the limiting member 51 through the impact member 5, causing the limiting member 51 to move away from the pen core 3. Before the resetting member 53 slowly resets the limiting member 51, the inner rod 1 moves away from the limiting member 51 under the action of the resetting spring 4, thereby completing the pen core retraction.

[0053] Invert the pen to release the core. Move the inner rod 1 towards the limiting member 51 while the pen is inverted. Before the resetting member 53 slowly resets the limiting member 51, pull the inner rod 1 to the core release holding area so that the limiting member 51 can remain in the limiting position after resetting, thereby completing the core release. Example

[0054] The difference from Example 1 is that, please refer to... Figures 9-12 The length of the outer rod 2 is less than the length of the inner rod 1 facing outward, creating a visual difference. The limiting groove 72 and the outer wall protrusion 71 on the outer wall of the inner rod 1 and the outer wall of the outer rod 2 adopt other forms. A hook 710 is provided on the outer wall of the inner rod 1, which cooperates with the slot 720 opened on the outer wall of the outer rod 2 to slide, so that the inner rod 1 and the outer rod 2 can slide relative to each other for a certain distance and are not easy to rotate relative to each other or to separate. A reset member 53 is fixedly connected between the limiting member 51 and the mounting member 6. The reset member 53 is composed of an elastic structure or elastic material. The example in the figure is a small spring. The elasticity of the reset member 53 ensures that the limiting member 51 will not shake arbitrarily when writing with a slight tilt, thus affecting the retention of the lead and making the lead more stable. However, it can retract the lead when the pen is thrown out, placed horizontally to a certain extent, or inverted.

[0055] The pen is inverted and the pen is used to impact the limiting member 51 through the impact member 5, causing the limiting member 51 to move away from the pen core 3. Before the resetting member 53 slowly resets the limiting member 51, the inner rod 1 moves away from the limiting member 51 under the action of the resetting spring 4, thereby completing the pen core retraction.

[0056] Invert the pen to release the core. Move the inner rod 1 towards the limiting member 51 while the pen is inverted. Before the resetting member 53 slowly resets the limiting member 51, pull the inner rod 1 to the core release holding area so that the limiting member 51 can remain in the limiting position after resetting, thereby completing the core release. Example

[0057] Please see Figures 13-14The present invention provides a technical solution: Unlike embodiment 1, the main body of the limiting member 51 is disc-shaped. The limiting member 51 is vertically slidably connected to the limiting rod 21. The lower side of the disc base of the limiting member 51 is provided with a step to cooperate with the top of the inner rod 1. The upper end of the disc base is provided with a notch that is staggered and slidably cooperates with the limiting rod 21. A reset member 53 is fixedly connected between the limiting member 51 and the mounting member 6. The reset member 53 is composed of an elastic structure or elastic material. The example in the figure is a small spring. The elastic force of the reset member 53 prevents the limiting member 51 from shaking arbitrarily when writing with a slight tilt, thus making the core extension more stable. However, it can retract the core when the pen is thrown out and placed horizontally to a certain extent or inverted.

[0058] The pen is inverted and the pen is used to impact the limiting member 51 through the impact member 5, causing the limiting member 51 to move away from the pen core 3. Before the resetting member 53 slowly resets the limiting member 51, the inner rod 1 moves away from the limiting member 51 under the action of the resetting spring 4, thereby completing the pen core retraction.

[0059] Invert the pen to release the core. Move the inner rod 1 towards the limiting member 51 while the pen is inverted. Before the resetting member 53 slowly resets the limiting member 51, pull the inner rod 1 to the core release holding area so that the limiting member 51 can remain in the limiting position after resetting, thereby completing the core release. Example

[0060] Please see Figure 15 The present invention provides a technical solution: the difference from embodiment 1 is that the main body of the limiting member 51 is disc-shaped, the limiting member 51 is vertically slidably connected to the limiting rod 21, the lower side of the disc base of the limiting member 51 is provided with a step to cooperate with the top of the inner rod 1, and the upper end of the disc base is provided with a notch to be staggered and slidably cooperate with the limiting rod 21.

[0061] The upper end of the limiting member 51 is provided with a weight 54, and the weight 54 is in contact with the limiting member 51. The weight 54 can increase the force on the limiting member 51 when the core is ejected, so that the engagement between the limiting boss 211 and the outer groove 111 is more stable.

[0062] It should be noted that at this time, the distance between the limiting member 51 and the mounting member 6 is the outer rod impact stroke M, and the distance between the limiting member 51 and the partition seat 2122 is the limiting impact stroke N. Under normal core ejection conditions, the outer rod impact stroke M is greater than the limiting impact stroke N. The sum of the limiting impact stroke N and the outer rod impact stroke M equals the total impact stroke. This situation is the opposite of that in Embodiment 1. In this embodiment, the temporary limiting force between the inner rod 1 and the outer rod 2 is relatively large. After coordination, the core will not retract when there is no external force interference and in a non-writing state, which can give the limiting member 51 enough time to perform the limiting.

[0063] When the core is retracted, the impactor 5 needs to impact the limiting member 51 first, so that the weighted member 54 impactor 5 is pushed away and away, and then the weighted member 54 impactor 5 is used to impact the outer rod 2, thereby realizing the core retraction. Example

[0064] Please see Figures 16-18 The present invention provides a technical solution: Unlike embodiment 1, the length of the outer rod 2 is greater than the length of the inner rod 1 facing outward, resulting in a visual difference. The main body of the limiting member 51 is disc-shaped, and there is no impact member 5, partition seat 2122, filler 52, or pen clip 2-1. In addition, the form of the mounting member 6 is different.

[0065] Specifically, a gravity-operated retractable pen includes an inner rod 1, an outer rod 2, a pen refill 3, a return spring 4, and a mounting component 6. The inner rod 1 is slidably telescopically sleeved on the inner side of the outer rod 2. The outer wall of the inner rod 1 and the inner wall of the outer rod 2 are respectively provided with a limiting groove 72 and an outer wall protrusion 71, which cooperate to keep the inner rod 1 and the outer rod 2 sliding relative to each other for a certain distance and are not easy to rotate relative to each other or to disengage. The return spring 4 is sleeved between the front part of the pen refill 3 and the inner side of the inner rod 1 to provide the retractable retractable force.

[0066] The inner rod 1 has a pair of limiting rods 11 extending upward from its outer wall, and an outer groove 111 is provided on the outer periphery of the top of the limiting rods 11; the inner wall of the outer rod 2 is provided with a limiting boss 211 that matches the outer groove 111 of the limiting rods 11, and the top of the limiting rods 11 has the ability to deform in the circumferential direction.

[0067] The inner wall of the outer rod 2 has a pair of limiting rods 21 protruding out. The limiting rods 11 and 21 are staggered and mutually restrict each other to prevent the inner rod 1 from rotating relative to the outer rod 2. The inner wall of the limiting rod 21 protrudes from the inner wall of the inner rod 1, and the tail end of the pen refill 3 abuts against the lower end of the limiting rod 21.

[0068] Mounting component 6 is located inside the outer rod 2 and above the inner rod 1. Mounting component 6 includes a fixing component 61 and a sliding rod 62. The fixing component 61 is fixedly engaged with the outer rod 2, and the sliding rod 62 is slidably connected to the middle of the fixing component 61. The top of the inner rod 1 is provided with a limiting component 51, which is matched between a pair of limiting rods 11. It can deform the pair of limiting rods 111 to abut outward, making it easier for the outer groove 111 and the limiting boss 211 to engage more stably. The limiting component 51 slides vertically between a pair of limiting rods 21. The connection is as follows: the lower side of the disc base of the limiting member 51 is provided with a step to cooperate with the top of the inner rod 1; the upper end of the disc base is provided with a notch to be staggered and slidably cooperate with the limiting rod 21; the limiting member 51 is fixedly connected to the sliding rod 62, which is composed of a rod and a top threaded connection, wherein the rod can also be integrally formed with the disc-shaped structure of the limiting member 51; the outer side of the sliding rod 62 is sleeved with a reset member 53, which is composed of an elastic structure or elastic material, and the reset member 53 is located inside the fixing member 61. A counterweight 8 is provided between the fixing member 61 and the sliding rod 62, and the counterweight 8 is annularly sleeved on the outer side of the sliding rod 62. The side of the fixing member 61 and the sliding rod 62 near the counterweight 8 is provided with an inwardly gradually inclined slope. The upper and lower ends of the counterweight 8 are inclined surfaces that match the inclined slope, which facilitates the movement and guidance of the counterweight 8. There is an movable gap P between the counterweight 8 and the outer wall of the sliding rod 62 to facilitate the movement of the counterweight 8.

[0069] When retracting the pen, hold the outer rod 2 and swing the pen out horizontally or upside down. The counterweight 8 moves and squeezes the sliding rod 62, causing it to overcome the elastic force of the reset member 53 and move away from the pen core 3. This causes the limiting member 51 to move outward, and the pair of limiting rods 21 restore their deformation. The limiting boss 211 does not engage with the outer groove 111. Under the reset force of the reset spring 4, the inner rod 1 and the outer rod 2 move in opposite directions, and the pen core 3 is retracted.

[0070] When the core is ejected, hold the outer rod 2 and pull the inner rod 1 upward to overcome the elastic force of the return spring 4. The limiting member 51 moves inward and presses between a pair of limiting rods 21. The pair of limiting rods 21 change outward and, through the pressure of the limiting member 51, the outer groove 111 and the limiting boss 211 are locked and stable. Under the action of the counterweight 8, the core is held in place by the indirect pressure of the limiting member 51 through the fixing member 61 and the return member 53. Example

[0071] Please see Figures 19-21 The present invention provides a technical solution: the difference from embodiment 1 is that the partition seat 2122 is composed of a slot seat 2121 and a plug rod 2120 that are matched and plugged in, wherein the slot seat 2121 is fixedly located at the top of the second limiting rod 21, and the plug rod 2120 is fixedly located at the lower end of the mounting part 6; and the lower end of the slot seat 2121 protrudes from the surface of the second limiting rod 21, the pen refill 3 is located between a pair of first limiting rods 11, the top of which abuts against the slot seat 2121, and the top of the first limiting rod 11 has the ability to deform inward in a circumferential direction.

[0072] The limiting member 51 is detachably mounted on the lower end of the mounting member 6. The impact member 5 is located inside the mounting member 6, the total impact stroke Q is located inside the mounting member 6, and the pen clip 2-1 is located outside the mounting member 6. The weight of the impact member 5 can press the partition seat 2122 when the limiting boss 211 is located in the outer groove 111, increasing the reaction force on the return spring 4, thereby preventing the limiting boss 211 and the outer groove 111 from easily separating, making the core ejection more stable. Furthermore, a limiting groove 6-2 is provided on the upper outer side of the mounting member 6, and a sliding protrusion 6-1 is provided on the top inner wall of the outer rod 2 to match the limiting groove 6-2, so that the mounting member 6 and the outer rod 2 can be detachably connected. The walls of the total impact stroke Q cavity of the mounting member 6 are hollowed out on both sides, and the limiting rod 11 is placed in the hollowed-out area, which can prevent the limiting rod 11 from rotating circumferentially and limit the excessive vertical movement of the limiting rod 11.

[0073] The diameter of the inner wall section of the total impact stroke Q gradually increases in the direction away from the outer rod 2, forming an auxiliary slope to help the impact component 5 to more easily impact the mounting component 6 when the pen is placed horizontally or inverted, causing it to move outward.

[0074] When retracting the pen, holding the inner rod 1 and swinging the pen out, placing it horizontally, or inverting it will cause the impacting element 5 to move away from the pen refill 3. At this time, the auxiliary slope can help the impacting element 5 to move more smoothly outward, pushing the slot seat 2121 and the outer rod 2 to move upward relative to the inner rod 1. At the same time, the return spring 4 abuts against the pen refill 3, causing the pen refill 3 to retract. Alternatively, the pen clip 2-1 set on the outside of the mounting part 6 can be pushed from the side, and the pen can be rotated to control the impacting element 5 to move away from the pen refill 3. This controls the movement of the mounting part 6, so that the limiting element 51 does not press against the limiting rod 11 with gravity. At the same time, the insertion rod 2120 drives the slot seat 2121 and the outer rod 2 to move upward relative to the inner rod 1. The return spring 4 abuts against the pen refill 3, thus retracting the pen refill.

[0075] When the core is ejected, hold the outer rod 2 and pull the inner rod 1 upward to overcome the elastic force of the return spring 4. The top of the limiting rod 11 passes the limiting boss 211. At the same time, under the gravity of the impact member 5 and the deformation of the top of the limiting rod 11, the limiting boss 211 is kept in the outer groove 111, thus maintaining the ejection of the core. Example

[0076] Please see Figures 22-27This invention provides a technical solution: a gravity-operated retractable pen, comprising an inner rod 1, an outer rod 2, a pen core 3, and a return spring 4. The inner rod 1 is slidably and telescopically sleeved on the inner side of the outer rod 2. The outer rod 2 is further divided into an installation component 6, which includes a fixing component 61 that is engaged and positioned with the outer rod 2, a sliding rod 62, and a tail component 63. The outer walls of the inner rod 1 and the fixing component 61 are provided with an outer wall protrusion 71, and the inner wall of the outer rod 2 is provided with a limiting groove 72. The cooperation of the outer wall protrusion 71 and the limiting groove 72 allows the inner rod 1 and the outer rod 2 to maintain relative sliding distance and prevent relative rotation. The return spring 4 is sleeved between the front of the pen core 3 and the inner side of the inner rod 1 to provide the retractable retractable force. The inner rod 1 is composed of an upper inner rod 1b and a lower inner rod 1a connected by threads. A rubber sleeve 1-1 is sleeved on the outer side of the lower inner rod 1a to ensure comfortable handwriting.

[0077] A limiting rod assembly 12 extends upward from the outer wall of the upper inner rod 1b. The limiting rod assembly 12 is a rod-shaped structure, and a limiting part 92 is provided inward at the top of the limiting rod assembly 12.

[0078] The sliding rod 62 is slidably connected to the middle of the fixing member 61, and a counterweight 8 is provided between the upper end of the fixing member 61 and the top of the sliding rod 62. The counterweight 8 is a ring sleeve on the outside of the sliding rod 62. The side of the fixing member 61 and the sliding rod 62 near the counterweight 8 is set as an inwardly gradually inclined slope. The upper and lower ends of the counterweight 8 are inclined surfaces that match the inclined slope, which facilitates the movement and guidance of the counterweight 8. There is an movable gap P between the counterweight 8 and the outer wall of the sliding rod 62 to facilitate the movement of the counterweight 8.

[0079] The tail piece 63 is detachably fixed to the lower end of the fixing piece 61. Specifically, the tail piece 63 is provided with a hook 631 that matches the hole 611 on the outer wall of the fixing piece 61. In order to facilitate the assembly of each part of the mounting piece 6 along the length direction, the hook 631 can deform inward and be inserted into the hole 611. The lower end of the tail piece 63 extends into the upper inner rod 1b and abuts against the upper end of the pen refill 3.

[0080] A reset member 53 is sleeved on the outer side of the sliding rod 62. One side of the reset member 53 abuts against the inner wall of the fixing member 61, and the other side abuts against the limiting member 51. A guide member 91 is fixedly connected to the tail member 63, and the guide member 91 is located below the limiting member 51. A limiting channel is formed on the outer periphery of the guide member 91 for the limiting part 92 to move. In this example, the limiting channel around the guide member 91 can be regarded as a closed loop structure similar to a closed ring. An assembly slide is provided on the tail member 63 and below the guide member 91 for the limiting part 92 to be assembled into.

[0081] Furthermore, the sliding rod 62 has an impact stroke Q on its inner side, and an impact member 5 is provided within the impact stroke Q. The impact member 5 can help the sliding rod 62 move outward by impacting with gravity when it moves away from the pen refill 3.

[0082] In this example, the guide 91 has a prismatic structure, and the inclined surface facing the limiting member 51 is the core-gathering guide surface. The inclined surface guides the limiting part 92 to move downward during core gathering. The core-gathering guide surface and the limiting member 51 are distributed at an angle. The adjacent sides of the core-gathering guide surface are arranged parallel and vertically, and the length of the core-gathering guide surface is greater than the length of the adjacent two sides, so that the limiting part 92 can be smoothly guided downward during core gathering and guided upward during core discharging.

[0083] When retracting the pen, hold the lower inner rod 1a and swing the pen out horizontally or upside down. The counterweight 8 moves inward, pressing the sliding rod 62 to overcome the elastic force of the reset member 53 and move away from the pen refill 3. This causes the limiting member 51 to move outward, increasing the distance between the limiting member 51 and the guide member 91. The limiting part 92 has a slight deformation capability and can pass through the gap between the limiting member 51 and the guide member 91 to reach the lower side of the guide member 91. The outer rod 2 can then move away from the inner rod 1, leaving a distance. The reset spring 4 can then move the pen refill 3 to achieve retraction. Alternatively, manually grip the lower inner rod 1a and the outer rod 2 and move them to both sides so that the limiting member 51 does not obstruct the limiting part 92, thus achieving retraction.

[0084] When the lead is ejected, hold the outer rod 2 and pull the inner rod 1 upward to overcome the elastic force of the return spring 4. The limiting part 92 moves around the limiting channel to the upper side of the guide 91. At the same time, the counterweight 8 no longer presses the sliding rod 62. Under the action of the return member 53, the limiting member 51 is reset. The gap between the limiting member 51 and the guide 91 is not enough for the limiting part 92 to pass through. Therefore, the limiting part 92 is positioned on the upper side of the gap between the limiting member 51 and the guide 91. The lead 3 moves to abut against the tail member 63 to keep the lead ejected. Example

[0085] Please see Figures 28-32 The present invention provides a technical solution: a gravity-operated retractable pen, comprising an inner rod 1, an outer rod 2, a pen refill 3, and a return spring 4. The inner rod 1 is slidably telescopically sleeved on the inner side of the outer rod 2. The outer wall of the inner rod 1 and the inner wall of the outer rod 2 are respectively provided with an outer wall protrusion 71 and a limiting groove 72, which cooperate to keep the inner rod 1 and the outer rod 2 sliding relative to each other for a certain distance and making it difficult for them to rotate relative to each other. The outer wall protrusion 71 of the inner rod 1 can also be generated by the lower end of the limiting rod assembly 12 protruding from the outer wall of the inner rod 1. The return spring 4 is sleeved between the front part of the pen refill 3 and the inner side of the inner rod 1 to provide the retractable retractable force.

[0086] The inner rod 1 has a limiting arc block and a middle rod extending upward from its outer wall. The limiting arc block and the middle rod together form the limiting rod assembly 12. The width of the limiting arc block is greater than that of the middle rod. The outer wall of the limiting arc block protrudes slightly from the outer wall of the inner rod 1 to form an outer wall protrusion 71. The limiting groove 72 is correspondingly provided on the lower side of the limiting arc block on the inner wall of the outer rod 2.

[0087] An installation component 6 is also disassembled from the outer rod 2. The installation component 6 is located inside the outer rod 2 and above the inner rod 1. The installation component 6 includes a fixing component 61 and a sliding rod 62. The fixing component 61 is snapped and fixed to the inner side of the outer rod 2. The sliding rod 62 slides through the middle of the fixing component 61. The lower part of the fixing component 61 is divided into two regions laterally. The middle rod is located in the first region, and an inclined guide component 91 is fixed in the first region. A limiting channel is formed on the outer periphery of the guide component 91 for the movement of the limiting part 92. In this example, the limiting channel around the guide component 91 can be regarded as a closed loop structure similar to a closed ring. The top of the middle rod has a protruding inclined surface with the limiting part 92 and the guide component 91. The sliding connection has a limiting block on the side of the limiting part 92 away from the guide member 91. A slide is provided between the two areas, and the limiting block is slidably connected in the slide. The other end of the limiting block away from the middle rod extends into the second area and connects with the slider provided in the second area. The slider matches the second area and is restricted to sliding only vertically. The limiting block and the slider are fixedly connected to form the limiting member 51. The sliding rod 62 is engaged with the upper end of the limiting member 51 through an eccentric connecting rod, and the outer end of the connecting rod is sleeved with an elastic material such as a reset member 53 and fixedly connected between the limiting member 51 and the sliding rod 62. When the limiting member 51 and the bottom of the sliding rod 62 are eccentrically connected, the connection can be assisted by the connecting rod.

[0088] A counterweight 8 is provided between the fixed member 61 and the sliding rod 62, and the counterweight 8 is a ring sleeve on the outside of the sliding rod 62. The fixed member 61 and the sliding rod 62 are provided with an inwardly gradually inclined slope on the side near the counterweight 8. The upper and lower ends of the counterweight 8 are inclined surfaces that match the inclined slope, which facilitates the movement and guidance of the counterweight 8. There is an movable gap P between the counterweight 8 and the outer wall of the sliding rod 62 to facilitate the movement of the counterweight 8.

[0089] The outer wall of the fixing member 61 is provided with a core-ejection guide slope 921, which cooperates with the top of the middle rod. When the middle rod lacks flexibility, the core-ejection guide slope 921 can assist in core ejection. The core-ejection guide slope 921 protrudes slightly from the outer wall of the inner rod 1, similar to the limiting arc block, and slides in cooperation with the limiting groove 72. Corresponding limiting protrusions are provided on the inner wall of the outer rod 2 and on the lower side of the counterweight 8.

[0090] The pen refill 3 is located inside the limiting arc block, and the upper end of the pen refill 3 is in contact with the lower end of the fixing part 61.

[0091] In this example, the guide 91 has a prismatic structure, and the inclined surface facing the limiting member 51 is the core-gathering guide surface. The inclined surface guides the limiting part 92 to move downward during core gathering. The core-gathering guide surface and the limiting member 51 are distributed at an angle. The adjacent sides of the core-gathering guide surface are arranged parallel and vertically, and the length of the core-gathering guide surface is greater than the length of the adjacent two sides, so that the limiting part 92 can be smoothly guided downward during core gathering and guided upward during core discharging.

[0092] When retracting the lead, hold the outer rod 2 and swing the pen out horizontally or upside down. The counterweight 8 moves inward, pressing the sliding rod 62 to overcome the elastic force of the reset member 53 and move away from the lead 3. This causes the limiting member 51 to move outward, increasing the distance between the limiting member 51 and the guide member 91. The limiting part 92 has a slight deformation capability and can pass through the gap between the limiting member 51 and the guide member 91 to reach the lower side of the guide member 91 without obstruction. The outer rod 2 can then move away from the inner rod 1, leaving a distance so that the lead 3 can move under the reset force of the reset spring 4 to retract the lead. Alternatively, manually grip the lower inner rod 1 and the outer rod 2 and move them to both sides so that the limiting member 51 does not obstruct the limiting part 92, thus retracting the lead. The limiting part 92 then moves closer to the lead-out guide slope 921.

[0093] When the pen lead is ejected, hold the outer rod 2 and pull the inner rod 1 upward to overcome the elastic force of the return spring 4. The limiting part 92 moves around the limiting channel to the upper side of the guide member 91. At the same time, the counterweight 8 no longer presses the sliding rod 62. Under the action of the return member 53, the limiting member 51 is reset. The gap between the limiting member 51 and the guide member 91 is not enough for the limiting part 92 to pass through. Therefore, the limiting part 92 is positioned on the upper side of the gap between the limiting member 51 and the guide member 91. The pen lead 3 abuts against the lower end of the fixing member 61 to keep the pen lead ejected. Example

[0094] Please see Figures 33-35 The present invention provides a technical solution: a gravity-operated retractable pen, comprising an inner rod 1, an outer rod 2, a pen refill 3, and a return spring 4. The inner rod 1 is slidably telescopically sleeved on the inner side of the outer rod 2. The outer wall of the inner rod 1 and the fixing member 61 is provided with an outer wall protrusion 71, and the inner wall of the outer rod 2 is provided with a limiting groove 72. The cooperation of the outer wall protrusion 71 and the limiting groove 72 allows the inner rod 1 and the outer rod 2 to maintain relative sliding distance and are not easy to rotate relative to each other. The return spring 4 is sleeved between the front part of the pen refill 3 and the inner side of the inner rod 1 to provide the retractable retractable force.

[0095] The inner rod 1 has an upwardly extending outer wall with a limiting arc block and a middle rod. The limiting arc block and the middle rod together form a limiting rod assembly 12. The width of the limiting arc block is greater than that of the middle rod. The inner wall of the middle rod protrudes from the inner wall of the inner rod 1 to block the tail end of the pen refill 3.

[0096] An installation component 6 is also disassembled from the outer rod 2. The installation component 6 is located inside the outer rod 2 and above the inner rod 1. The installation component 6 includes a fixing component 61 and a sliding rod 62. The sliding rod 62 is slidably connected to the middle part of the fixing component 61. The fixing component 61 is fixedly engaged with the outer rod 2. The lower part of the fixing component 61 vertically forms two through areas. The middle rod is located in the first area. A guide component 91 is fixedly provided between the two areas. A limiting channel is formed on the outer periphery of the guide component 91 for the movement of the limiting part 92. In this example, the limiting channel surrounds... The guide member 91 can be regarded as a closed-loop structure similar to a closed ring. The top of the middle rod has a limiting part 92 that is slidably connected to the lower slope of the guide member 91. A limiting block is provided above the guide member 91, and the other end of the limiting block away from the middle rod is connected to the slider provided in the second area. The slider and the limiting block are fixedly connected to form the limiting member 51. The slider matches the second area and is restricted to sliding only vertically. The limiting arc block cooperates with the lower part of the slide rail opened on the side of the fixing member 61 and is restricted to sliding only vertically.

[0097] In this example, the guide 91 has a prismatic structure, and the inclined surface facing the limiting member 51 is the core-gathering guide surface. The inclined surface guides the limiting part 92 to move downward during core gathering. The core-gathering guide surface and the limiting member 51 are distributed at an angle. The adjacent sides of the core-gathering guide surface are arranged parallel and vertically, and the length of the core-gathering guide surface is greater than the length of the adjacent two sides, so that the limiting part 92 can be smoothly guided downward during core gathering and guided upward during core discharging.

[0098] The bottom of the sliding rod 62 is slidably connected to the upper end of the slider via a connecting rod, and the outer end of the connecting rod is fitted with an elastic material such as a reset member 53 and fixedly connected between the slider and the inner wall of the fixing member 61; when the limiting member 51 is eccentrically connected to the bottom of the sliding rod 62, the connecting rod can be used for auxiliary connection.

[0099] A counterweight 8 is provided between the fixed member 61 and the sliding rod 62. The counterweight 8 is a ring sleeve on the outside of the sliding rod 62 and located on the upper side of the outer rod 2. The fixed member 61 and the side of the sliding rod 62 near the counterweight 8 are set as inclined slopes that gradually move inward. The length of the inclined slope on the fixed member 61 is less than the length of the inclined slope on the sliding rod 62. The upper and lower ends of the counterweight 8 are inclined slopes that match the inclined slopes, which facilitates the movement and guidance of the counterweight 8. There is an movable gap P between the counterweight 8 and the outer wall of the sliding rod 62 to facilitate the movement of the counterweight 8.

[0100] When retracting the pen, hold the outer rod 2 and swing the pen out horizontally or upside down. The counterweight 8 moves inward, pressing the sliding rod 62 to overcome the elastic force of the reset member 53 and move away from the pen lead 3. This causes the limiting member 51 to move outward, increasing the distance between the limiting member 51 and the guide member 91. The limiting part 92 has a slight deformation ability and can pass through the gap between the limiting member 51 and the guide member 91 to reach the lower side of the guide member 91 without obstruction. The outer rod 2 can then move away from the inner rod 1, leaving enough distance for the pen lead 3 to move under the reset force of the reset spring 4, thus retracting the pen. Alternatively, one can manually grip the inner rod 1 and the outer rod 2 and move them to both sides, so that the limiting member 51 does not obstruct the limiting part 92, thus retracting the pen.

[0101] When the pen lead is ejected, hold the outer rod 2 and pull the inner rod 1 upward to overcome the elastic force of the return spring 4. The limiting part 92 moves around the limiting channel to the upper side of the guide member 91. At the same time, the counterweight 8 no longer presses the sliding rod 62. Under the action of the return member 53, the limiting member 51 is reset. The gap between the limiting member 51 and the guide member 91 is not enough for the limiting part 92 to pass through. Therefore, the limiting part 92 is positioned on the upper side of the gap between the limiting member 51 and the guide member 91. The pen lead 3 abuts against the lower end of the fixing member 61 to keep the pen lead ejected. Example

[0102] Please see Figures 36-40 This invention provides a technical solution: a gravity-operated retractable pen, comprising an inner rod 1, an outer rod 2, a pen refill 3, and a return spring 4. The inner rod 1 is slidably and telescopically sleeved on the inner side of the outer rod 2. The outer wall of the inner rod 1 and the fixing member 61 is provided with an outer wall protrusion 71, and the inner wall of the outer rod 2 is provided with a limiting groove 72. The cooperation of the outer wall protrusion 71 and the limiting groove 72 allows the inner rod 1 and the outer rod 2 to maintain relative sliding distance and are not easy to rotate relative to each other. The outer wall of the inner rod 1 also forms a hook-shaped structure with elastic inward deformation, which is staggered with the outer wall protrusion 71. At the same time, it cooperates with other limiting grooves 72 to limit sliding. The return spring 4 is sleeved between the front part of the pen refill 3 and the inner side of the inner rod 1 to provide the retractable retractable force. The inner rod 1 is composed of an upper inner rod 1b and a lower inner rod 1a connected by threads.

[0103] The outer wall of the upper inner rod 1b extends upward and is provided with a limiting arc block and a middle arc block in sequence. The limiting arc block and the middle arc block constitute the limiting rod assembly 12. The inner top wall of the limiting arc block protrudes from the inner wall of the inner rod 1 to block the tail end of the pen refill 3, and the pen refill 3 is located inside the limiting arc block.

[0104] An installation component 6 is also separated from the outer rod 2. The installation component 6 is located inside the outer rod 2 and above the inner rod 1. The installation component 6 includes a fixing component 61 and a sliding rod 62. The fixing component 61 is snapped and fixed to the inner side of the outer rod 2. The sliding rod 62 slides through the middle of the fixing component 61. The lower part of the fixing component 61 forms two through areas. The central arc-shaped block is located in the first area, and a guide component 91 is fixedly provided in the first area. The inner side of the central arc-shaped block is movably connected to a limiting part 92. A limiting channel is formed between the guide component 91 and the inner wall of the fixing component 61 for the limiting part 92 to slide. In this example, the limiting channel and the guide component 91 are parallel and can be regarded as a similar linear bending structure. The inner side of the central arc-shaped block is provided with an installation groove 920 for the limiting part 92 to be movably installed, so that the tail end of the limiting part 92 can be movably installed in the installation groove 920 and is not easy to detach.

[0105] A limiting block is provided on the inner side of the fixing member 61, on the side of the limiting part 92 away from the guide member 91. A slide is provided between the two areas. The limiting block is slidably connected in the slide. The other end of the limiting block away from the central arc block extends into the second area and is connected to the slider provided in the second area. The slider matches the second area and is restricted to sliding only vertically. The limiting block and the slider are fixedly connected to form the limiting member 51. The sliding rod 62 is fixed to the upper end of the limiting member 51, and the outer end of the sliding rod 62 is sleeved with an elastic material such as a reset member 53 and fixedly connected between the limiting member 51 and the sliding rod 62.

[0106] A counterweight 8 is provided between the fixed member 61 and the sliding rod 62, and the counterweight 8 is a ring sleeve on the outside of the sliding rod 62. The fixed member 61 and the sliding rod 62 are provided with an inwardly gradually inclined slope on the side near the counterweight 8. The upper and lower ends of the counterweight 8 are inclined surfaces that match the inclined slope, which facilitates the movement and guidance of the counterweight 8. There is an movable gap P between the counterweight 8 and the outer wall of the sliding rod 62 to facilitate the movement of the counterweight 8.

[0107] An impact member 5 is provided on the outside of the counterweight 8, and the impact member 5 is ring-shaped and sleeved between the top of the outer rod 2 and the top of the sliding rod 62. The top extension edge of the sliding rod 62 and the top of the outer rod 2 restrict the impact member 5 from falling off.

[0108] When retracting the pen, hold the outer rod 2 and swing the pen out horizontally or upside down. The counterweight 8 moves inward to press the sliding rod 62, and the impactor 5 impacts the top edge of the sliding rod 62 outward, overcoming the elasticity of the reset member 53 and causing the sliding rod 62 to move away from the pen lead 3. This causes the limiting member 51 to move outward, increasing the distance between the limiting member 51 and the guide member 91. The limiting part 92 can pass through the gap between the limiting member 51 and the guide member 91 to reach the lower position of the guide member 91 without obstruction. The outer rod 2 can then move away from the inner rod 1, allowing the pen lead 3 to move under the reset force of the reset spring 4 to retract. Alternatively, manually grip the lower inner rod 1 and the outer rod 2 and move them to the sides, so that the limiting member 51 does not obstruct the limiting part 92, thus retracting the pen lead.

[0109] When the pen lead is ejected, the outer rod 2 is held and the inner rod 1 is pulled upward to overcome the elastic force of the return spring 4. The limiting part 92 moves from the limiting channel to the upper side of the guide 91, that is, the upper side of the bending point of the bending structure. At the same time, the counterweight 8 no longer squeezes the sliding rod 62, and the impacting part 5 does not exert an outward impact force on the sliding rod 62. Under the action of the returning part 53, the limiting part 51 is reset. The gap between the limiting part 51 and the guide 91 is not enough for the limiting part 92 to pass through. Therefore, the limiting part 92 is positioned on the upper side of the gap between the limiting part 51 and the guide 91. The pen lead 3 abuts against the lower end of the fixing part 61 to keep the pen lead ejected. Example

[0110] Please see Figures 41-46 The present invention provides a technical solution: a gravity-operated retractable pen, comprising an inner rod 1, an outer rod 2, a pen refill 3, and a return spring 4. The inner rod 1 is slidably and telescopically sleeved on the inner side of the outer rod 2. The outer wall of the inner rod 1 and the fixing member 61 is provided with an outer wall protrusion 71, and the inner wall of the outer rod 2 is provided with a limiting groove 72. The cooperation of the outer wall protrusion 71 and the limiting groove 72 allows the inner rod 1 and the outer rod 2 to maintain relative sliding distance and are not easy to rotate relative to each other. The return spring 4 is sleeved between the front part of the pen refill 3 and the inner side of the inner rod 1 to provide the retractable retractable force. The inner rod 1 is composed of an upper inner rod 1b and a lower inner rod 1a connected by threads.

[0111] An installation component 6 is also separated from the outer rod 2. The installation component 6 is located inside the outer rod 2 and above the inner rod 1. The installation component 6 includes a fixing component 61 and a sliding rod 62.

[0112] The outer wall of the upper inner rod 1b extends upwards and is provided with a limiting arc-shaped block and a middle arc-shaped block in sequence. The limiting arc-shaped block and the middle arc-shaped block constitute the limiting rod assembly 12. The inner top wall of the limiting arc-shaped block protrudes from the inner wall of the inner rod 1 to block the tail end of the pen refill 3. The lower end of the fixing member 61 protrudes and is located inside the limiting arc-shaped block, and the pen refill 3 abuts against the lower end of the fixing member 61. The middle arc-shaped block can be composed of a middle inner plate integrally connected with the limiting arc-shaped block and a detachable arc-shaped outer plate. The arc-shaped outer plate is snapped into the lower part of the outer periphery of the middle inner plate, thereby forming a mounting groove 920 between the middle inner plate and the arc-shaped outer plate. The limiting arc-shaped block and the middle arc-shaped block are provided with arc-shaped limiting edges on both sides of the side near the mounting member 61. The fixing member 61 is provided with notches on both sides, and the arc-shaped limiting edges on both sides are slidably connected in the notches.

[0113] The sliding rod 62 is slidably connected to the top side wall of the fixing member 61. The cross-section is arc-shaped. The fixing member 61 is snapped and fixed to the inner side of the outer rod 2. The lower part of the fixing member 61 forms two through areas. The arc-shaped block in the middle is located in the first area. The guide member 91 is fixedly provided in the first area. The limiting part 92 is movably installed inside the mounting groove 920. The outer periphery of the guide member 91 forms a limiting channel for the limiting part 92 to move. In this example, the limiting channel around the guide member 91 can be regarded as a closed loop structure similar to a closed ring.

[0114] A limiting block is provided on the side of the limiting part 92 away from the guide member 91. A slide is provided between the two areas. The limiting block is slidably connected in the slide. The other end of the limiting block away from the central arc block extends into the second area and is connected to the slider provided in the second area. The slider matches the second area and is restricted to sliding only vertically. The limiting block and the slider are fixedly connected to form the limiting member 51. The sliding rod 62 is fixedly connected to the upper outer wall of the limiting member 51. An elastic material such as a reset member 53 is installed on the upper end of the limiting member 51 and fixedly connected between the limiting member 51 and the top wall of the second area. A counterweight 8 is provided between the fixed member 61 and the sliding rod 62. The counterweight 8 is spherical. The side of the fixed member 61 and the sliding rod 62 near the counterweight 8 is set as an inwardly gradually inclined slope. The elastic force of the reset member 53 can make the sliding rod 62 move along the fixed member 61 to provide an activity distance P, thereby facilitating the movement of the counterweight 8.

[0115] When retracting the pen tip, hold the outer rod 2 and swing the pen out horizontally or upside down. The counterweight 8 moves outward, pressing the top of the sliding rod 62 with its own gravity. This overcomes the elasticity of the reset member 53, causing the sliding rod 62 to move away from the pen tip 3. This causes the limiting member 51 to move outward, increasing the distance between the limiting member 51 and the guide member 91. The limiting part 92 can then pass through the gap between the limiting member 51 and the guide member 91 to reach the lower position of the guide member 91 without obstruction. The outer rod 2 can then move away from the inner rod 1, allowing the pen tip 3 to move under the reset force of the reset spring 4, thus retracting the pen tip. Alternatively, one can manually grip the lower inner rod 1 and the outer rod 2 and move them to the sides, so that the limiting member 51 does not obstruct the limiting part 92, thus retracting the pen tip.

[0116] When the pen lead is ejected, hold the outer rod 2 and pull the inner rod 1 upward to overcome the elastic force of the return spring 4. The limiting part 92 moves from the limiting channel to the upper side of the guide 91. At the same time, the counterweight 8 no longer presses the sliding rod 62. Under the action of the return member 53, the limiting member 51 is reset. The gap between the limiting member 51 and the guide 91 is not enough for the limiting part 92 to pass through. Therefore, the limiting part 92 is positioned on the upper side of the gap between the limiting member 51 and the guide 91. The pen lead 3 abuts against the lower end of the fixing member 61 to keep the pen lead ejected.

[0117] In summary, the present invention has at least the following two core ejection methods: 1. Core ejection by lifting: Lifting the inner rod 1 so that the limiting boss 211 enters the outer groove 111 and is restricted by the limiting member 51 or the limiting part 92 enters the guide member 91 and is restricted by the limiting member 51, thereby maintaining the core ejection.

[0118] In summary, the present invention has at least the following retraction methods: 1. Inverted retraction: The pen is inverted, and external force and gravity influence the limiting member 51 to move away from the pen refill 3, releasing the restriction on the limiting part 92 or the limiting rod 11, and the refill is retracted under the action of the return spring 4. 2. Tapping retraction: The pen is tapped against an external object or an external object taps the pen; external force and gravity influence the limiting member 51 to move away from the pen refill 3, releasing the restriction on the limiting part 92 or the limiting rod 11, and the refill is retracted under the action of the return spring 4. 3. Trigger retraction: The pen's trigger ring touches another object or another object touches the pen. External force and gravity influence the limiting member 51 to move away from the pen refill 3, releasing the restriction on the limiting part 92 or the limiting rod 11, and the refill is retracted under the action of the return spring 4. 4. Vibration-based retraction: The pen is dropped freely from a certain distance. External force and gravity cause the limiting member 51 to move away from the pen refill 3, releasing the restriction on the limiting part 92 or the limiting rod 11. The refill is then retracted under the action of the return spring 4. 5. Manual retraction: The counterweight 8 is manually pressed to push the sliding rod 62 upwards, causing the limiting member 51 to move away from the pen refill 3. This releases the restriction on the limiting part 92, and the refill is then retracted under the action of the return spring 4.

[0119] Additional explanation: The term "lifting force" is a general term for operations performed from bottom to top, including not only lifting operations but also side-pressing, pinching, and rotating operations. The core purpose is to move the inner rod upward while keeping the outer rod stationary. The external force mentioned in the above embodiments can be impact force, striking force, tapping force, vibration force, inertial force, gravity, collision force, or a force exerted on the pen by the user.

Claims

1. A gravity-operated retractable pen, comprising a writing sleeve, a pen refill (3), a return spring (4), and a gravity component, wherein the writing sleeve comprises an inner rod (1) and an outer rod (2); the inner rod (1) and the outer rod (2) are slidably sleeved together, the pen refill (3) is located inside the writing sleeve, and the return spring (4) is sleeved on the outer end of the pen refill (3) to provide a retractable retractable force, characterized in that: The gravity component is movably mounted at the end of the pen refill (3); a refill holding mechanism is provided between the inner rod (1) and the outer rod (2) to temporarily lock the refill in a balanced state; the refill holding mechanism includes a limiting component (51) and a resetting component (53); the gravity component is an impact component (5); the outer rod (2) and / or the inner rod (1) have an impact stroke (Q) that allows the impact component (5) to move freely along the pen length direction; when the pen refill is closed, the impact component (5) moves along the impact stroke (Q), impacts the limiting component (51) to cause axial displacement, and breaks the refill balance state; when the refill balance state is broken, the limiting component (51) is displaced and unlocked so that the inner rod (1) and the outer rod (2) can move relative to each other to close the pen refill; when the pen refill is closed, the gravity component moves away from the pen refill (3), and the gravity and / or the refill force generated by its own weight are released. Alternatively, an external force can drive the limiting member (51) to overcome the elastic force of the reset member (53) and cause displacement, thereby breaking the core release and maintaining the balance state to achieve core retraction.

2. The gravity-operated retractable pen according to claim 1, characterized in that: When writing is required, the pen is forcefully thrown downwards; the impact component (5) overcomes the elastic force of the return spring (4) through gravity or the combined action of gravity and lifting force, causing the pen core (3) to emerge.

3. The gravity-operated retractable pen according to claim 1, characterized in that: A reset member (53) is connected between the upper side of the limiting member (51) and the outer rod (2). When the core is ejected, the elastic force of the reset member (53) acts on the limiting member (51) to strengthen the locking of the core ejection holding mechanism. When the core is retracted, the impact member (5) hits the limiting member (51) to overcome the elastic force of the reset member (53) and unlock the core ejection holding mechanism.

4. A gravity-operated retractable pen according to claim 1, characterized in that: The core-out holding mechanism includes an outer groove (111) located on the outer wall of the inner rod (1) and a limiting boss (211) located on the inner wall of the outer rod (2); the outer groove (111) and the limiting boss (211) are engaged when the core is out and disengaged when the core is retracted.

5. A gravity-operated retractable pen according to claim 4, characterized in that: The inner rod (1) extends upward from the outer wall and is fixedly connected to at least one limiting rod (11). The outer groove (111) is located at the end of the limiting rod (11) away from the inner rod (1). The inner wall of the outer rod (2) is provided with a pair of limiting rods (21). The limiting rods (21) and the limiting rods (11) are staggered. The limiting boss (211) is located at the top of the limiting rods (21).

6. A gravity core pen according to claim 1, characterized in that: The inner rod (1) extends upward from the outer wall and is fixedly connected to at least one limiting rod (11). The limiting member (51) is movably located at the top of the limiting rod (11). The top of the limiting rod (11) has radial deformation capability under the action of external force. The limiting member (51) can movably squeeze the limiting rod (11) to deform.

7. A gravity core pen according to claim 1, wherein: The limiting member (51) is spherical or disc-shaped, or is a structure formed integrally by a slider and a limiting block.

8. A gravity core pen according to claim 1, characterized in that: The upper side of the limiting member (51) is provided with a weight (54).

9. A gravity core pen according to claim 1, wherein: When the total impact stroke (Q) is inside the outer rod (2), the diameter of the cavity wall section gradually increases towards the side away from the pen core (3) to form an auxiliary slope.

10. A gravity core pen according to claim 1, characterized in that: An installation component (6) is separated from the outer rod (2). The installation component (6) is a separate accessory that can be detachably installed on the outer rod (2); or the installation component (6) is integrally formed with the outer rod (2).

11. A gravity core pen according to claim 10, wherein: The mounting component (6) includes a fixing component (61), which is detachably and slidably installed on the inner wall of the outer rod (2); or the fixing component (61) is integrally connected, snap-fitted or threadedly connected to the inner wall of the outer rod (2).

12. A gravity core pen according to claim 11, wherein: When the fixing member (61) is detachably and slidably installed on the inner wall of the outer rod (2); the mounting member (6) includes a sliding protrusion (6-1) with the tail of the outer rod (2) facing inward, and a limiting groove (6-2) is opened on the outer periphery of the fixing member (61), and the sliding protrusion (6-1) is slidably connected in the limiting groove (6-2).

13. A gravity-operated retractable pen according to claim 10, characterized in that: The mounting component (6) has a pair of insert rods (2120) at its bottom end. The inner wall of the outer rod (2) is fixedly connected to a pair of slot seats (2121), and the slot seats (2121) are inserted into the insert rods (2120). The pen refill (3) is located on the lower side of the slot seats (2121).

14. A gravity core pen according to claim 11, wherein: When the fixing part (61) is integrally connected, snapped or threaded to the inner wall of the outer rod (2); the fixing part (61) is a pen plug or a blocking rod, and a partition seat (2122) is fixedly connected between the inner walls of the outer rod (2). The upper and lower cavity walls of the total impact stroke (Q) are respectively composed of a pen plug or a blocking rod and a partition seat (2122), and the pen core (3) is located on the lower side of the partition seat (2122).

15. A gravity-operated retractable pen, comprising a writing sleeve, a pen refill (3), a return spring (4), a gravity component, and a mounting component (6), wherein the writing sleeve comprises an inner rod (1) and an outer rod (2); the inner rod (1) and the outer rod (2) are slidably sleeved together, the pen refill (3) is located inside the writing sleeve, and the return spring (4) is sleeved on the outer end of the pen refill (3) to provide a retractable retractable force, characterized in that: The gravity component is movably mounted at the end of the pen refill (3); the inner rod (1) and the outer rod (2) are temporarily locked together while maintaining balance during refilling; the mounting component (6) includes a fixing component (61) and a sliding rod (62); the gravity component is a counterweight (8); the side sections of the fixing component (61) and the sliding rod (62) near the counterweight (8) are both designed as inclined planes that gradually approach each other inward; the upper end and / or lower end of the counterweight (8) are inclined planes that match the inclined planes; an movable gap (P) is formed between the outer wall of the sliding rod (62) and the counterweight (8); when refilling, the counterweight (8) moves radially along the movable gap (P), and the inclined plane squeezes the sliding rod (62) to cause axial displacement, breaking the balance state during refilling.

16. A gravity-operated retractable pen according to claim 15, characterized in that: It also includes a guide (91), a limiting part (92), and a locking and reinforcing limiting part (51) that is kept in a balanced state when the core is ejected. The guide (91) is disposed on the outer rod (2) and forms a limiting channel with the limiting part (51) for the limiting part (92) to slide. The limiting part (92) is fixedly connected to the inner rod (1) through the limiting rod assembly (12).

17. A gravity core pen according to claim 16, wherein: The limiting member (51) can move closer to or further away from the guide member (91) under the change of the direction of gravity of the gravity member. When it gets close to the guide member (91), the gap between the limiting member (51) and the guide member (91) is too small to allow the limiting part (92) to pass through. When it moves away from the guide member (91), the gap becomes larger and the limiting part (92) can pass through freely. The limiting rod assembly (12) has the radial displacement compensation capability to allow the limiting part (92) to slide freely along the limiting channel.

18. A gravity core pen according to claim 17, wherein: The limiting rod assembly (12) includes a rod-shaped structure extending upward from the outer wall of the inner rod (1), with a limiting part (92) located at the top of the rod-shaped structure. The rod-shaped structure has the ability to deform and compensate for the radial displacement of the limiting part (92) sliding freely along the limiting channel.

19. A gravity-operated retractable pen according to claim 17, characterized in that: The limiting rod assembly (12) comprises a limiting arc-shaped block and a middle rod extending upward from the upper end of the outer wall of the inner rod (1). The middle rod has the ability to deform to compensate for the radial displacement of the limiting part (92) sliding freely along the limiting channel; or it comprises a limiting arc-shaped block and a middle arc-shaped block extending upward from the upper end of the outer wall of the inner rod (1). The middle arc-shaped block has an installation groove (920) on its inner side for the limiting part (92) to be movably installed. The radial displacement of the limiting part (92) sliding freely along the limiting channel is compensated by the movable installation.

20. A gravity core pen according to claim 19, wherein: The central arc-shaped block consists of a central inner plate integrally connected with the limiting arc-shaped block and a detachable arc-shaped outer plate. The arc-shaped outer plate is snapped onto the lower part of the outer periphery of the central inner plate, thereby forming an installation groove (920) between the central inner plate and the arc-shaped outer plate.

21. A gravity core pen according to claim 17, wherein: The guide member (91) is a core-exiting boss, and the side of the core-exiting boss facing the limiting member (51) is a core-receiving guide surface. The core-receiving guide surface and the limiting member (51) are distributed at an angle.

22. A gravity core pen according to claim 17, wherein: The limiting channel is a closed-loop structure around the guide member (91), or the limiting channel is a linear structure.

23. A gravity core pen according to claim 17, wherein: The outer rod (2) is provided with a core-exiting guide slope (921), which is located on the upper side of the guide member (91) and is in the opposite direction to the inclination of the core-receiving guide surface.

24. A gravity-operated retractable pen according to claim 15, characterized in that: An installation component (6) is separated from the outer rod (2). The installation component (6) is a separate accessory that can be detachably installed on the outer rod (2); or the installation component (6) is integrally formed with the outer rod (2).

25. A gravity core pen according to claim 24, wherein: The mounting component (6) includes a fixing component (61), which is integrally connected, snap-fitted or threaded to the inner wall of the outer rod (2).

26. A gravity core pen according to claim 25, wherein: When the fixing member (61) is integrally connected, snapped or threaded to the inner wall of the outer rod (2); when the sliding rod (62) is slidably connected to the middle of the fixing member (61), the counterweight (8) is annular and sleeved on the outside of the sliding rod (62), and is movably installed between the top of the sliding rod (62) and the fixing member (61) to form the movable gap (P), and the counterweight (8) can move radially to push the sliding rod (62) away from the pen refill (3).

27. A gravity core pen according to claim 24, wherein: The mounting component (6) also includes a tail component (63), which is detachably connected to the lower end of the fixing component (61) as the lower part of the fixing component (61).

28. A gravity core pen according to any one of claims 1 to 27, wherein: The inner rod (1) and the outer rod (2) have a limiting structure that allows the inner rod (1) and the outer rod (2) to slide relative to each other a certain distance when the core is being extended / retracted.

29. A gravity core pen according to claim 28, wherein: The limiting structure includes at least one combination structure that is slidably connected to the inner rod (1) or the outer rod (2) by the cooperation of the outer wall protrusion (71) and the limiting groove (72); or at least one combination structure that is slidably connected to the inner rod (1) or the outer rod (2) by the cooperation of the hook (710) and the groove (720).

30. A gravity core pen according to claim 16, wherein: A reset member (53) is connected between the upper side of the limiting member (51) and the outer rod (2). When the core is ejected, the elastic force of the reset member (53) acts on the limiting member (51) to strengthen the locking of the core ejection holding mechanism. When the core is retracted, the gravity member moves radially and the core ejection holding mechanism is unlocked by overcoming the elastic force of the reset member (53) through the sliding rod (62).

31. A gravity core pen according to any of claims 3 or 30, wherein: The reset element (53) is made of an elastic material.

32. A gravity core pen according to any of claims 3 or 30, wherein: The reset component (53) is a spring.

33. A gravity core pen according to any of claims 3 or 30, wherein: The reset component (53) is a shape memory metal.

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