Pen

Abstract

The invention discloses a pen with an automatic refill collecting function. The pen comprises a refill, a reset spring and a rod piece assembly. The rod piece assembly is composed of a first rod piece and a second rod piece which can move relative to the axial direction and is provided with the maximum telescopic limit. The refill part is arranged in the rod piece assembly, and the reset spring provides reset force enabling the refill to tend to be in a refill retracting state. According to the innovative points, a locking mechanism and an inertia unlocking assembly are arranged; the locking mechanism resists the force of a reset spring in a core outlet state through mutual matching of a first matching part and a second matching part; the inertia unlocking assembly comprises an inertia part, and when the pen is impacted, the inertia part directly or indirectly acts on the locking mechanism due to inertia force, so that the matching part is disengaged from matching and unlocking is achieved, and automatic core collection is achieved. A manual unlocking mechanism is further arranged, and a side pressing type or rotating type unlocking mode is provided. The pen is ingenious in structural design, the writing stability is guaranteed, the refill can be automatically collected under the conditions of accidental falling and the like, the pen point is effectively protected, and the service life is prolonged.

Description

Technical Field

[0001] This invention relates to the field of writing instrument technology, specifically to a pen that is unlocked by inertial force and integrates multiple manual unlocking methods. Background Technology

[0002] Mechanical pencils, push-button ballpoint pens, and other writing instruments are widely used. Their conventional lead advance / retrieval mechanisms mostly rely on the user's active operation, such as repeatedly pressing the clip or rotating the pen barrel to switch the internal mechanism between locked and unlocked states.

[0003] However, such pens have a significant drawback: when the pen is subjected to axial impact due to an accident (such as a drop), the extended lead is highly susceptible to bending, breaking, or damage from direct impact with hard objects. This problem is particularly pronounced for professional draftsmen or users of expensive pens. Furthermore, pens with the lead not retracted can easily scratch clothing or other items when carried.

[0004] Existing technologies include some designs that attempt to utilize inertia for automatic protection, but these typically suffer from problems such as complex structures, high manufacturing costs, low reliability, or effectiveness only for specific drop postures. Many designs sacrifice the convenience of traditional manual operation to achieve automation, resulting in a poor user experience.

[0005] Therefore, there is an urgent need in this field for a refill pen that is ingeniously structured, responds quickly, can work reliably under multi-directional impacts, and is seamlessly compatible with multiple manual operation modes. Summary of the Invention

[0006] The primary objective of this invention is to provide a pen that can automatically and quickly release its locking state and retract its lead when subjected to axial impact, thereby providing effective passive safety protection.

[0007] Another objective of this invention is to provide a variety of optional manual unlocking methods, while ensuring the inertial core recovery function and retaining and optimizing the user's familiar manual operation experience.

[0008] Another objective of this invention is to optimize the internal structural layout so that the aforementioned functions can be achieved within the size of a conventional pen, ensuring the product's compactness and manufacturability.

[0009] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: A pen includes a pen refill, a return spring, and a lever assembly, the lever assembly including a first lever and a second lever movable relative to each other in an axial direction; the pen refill is at least partially disposed inside the lever assembly; the return spring is used to provide a restoring force to bring the pen refill to a retracted state; Its innovation lies in the fact that it also includes: A locking mechanism is used to resist the force of the return spring in the core-out state, so that the first rod and the second rod remain relatively fixed; the locking mechanism includes a first mating part and a second mating part that can cooperate with each other to lock, one of the first mating part and the second mating part is disposed on the first rod, and the other is disposed on the second rod; An inertial unlocking assembly includes at least one inertial element that can move freely along the axis of the pen; The inertial component is configured such that when the pen is subjected to an axial impact, the inertial component moves axially due to inertial force and acts directly or indirectly on the locking mechanism, causing the first mating part to disengage from the second mating part, thereby releasing the lock and realizing the core retraction.

[0010] As a preferred embodiment of the present invention: the second rod (2) includes a second rod body (2A) and a second rod limiting member (2B) that can move relative to each other in the axial direction; the second rod limiting member (2B) has maximum extension and retraction limitation with the second rod body (2A) and the first rod (1); the first rod (1) and the second rod limiting member (2B) can move relative to each other in the axial direction; with the second rod limiting member as an intermediate member, the dual functions of lifting out the core and pressing out the core are realized simultaneously.

[0011] Further technical solutions: Based on the above-mentioned basic solution, the present invention is enhanced and improved through a series of preferred but non-limiting technical features: Regarding the locking mechanism: the first mating part and the second mating part are mated by magnetic attraction, mechanical engagement, or a combination of magnetic attraction and mechanical engagement.

[0012] In the magnetic attraction scheme, the first mating part is a first magnet, and the second mating part is a second magnet or a magnetic material part that can attract the first magnet. The impact force of the inertial element is designed to overcome the magnetic attraction force.

[0013] In the mechanical engagement scheme, the first mating part is a boss, and the second mating part is an elastic claw capable of engaging with the boss. The impact of the inertial component can act directly on the elastic claw, or through a transmission structure on the rod on which the elastic claw is mounted, causing the elastic claw to undergo elastic deformation and disengage from the boss.

[0014] In the preferred composite mechanism, magnetic attraction is used to assist docking and provide the main axial holding force, while mechanical locking force is used to provide circumferential restraint, prevent accidental twisting unlocking, and make the locking more secure.

[0015] Regarding the setting of inertial components: The movement channel of the inertial component is parallel to the axis of the pen refill, which helps to ensure the effective transmission of impact force and simplifies the structure.

[0016] The inertial component's travel distance is greater than its own length, which provides it with sufficient acceleration distance to accumulate enough momentum to ensure the generation of an effective impact force.

[0017] The inertial component is fitted onto the first rod, the second rod, and / or the pen refill, allowing for flexible installation and facilitating full utilization of the pen barrel's internal space.

[0018] The inertial component naturally rests near the pen's grip area during writing. This design cleverly lowers the pen's center of gravity, making writing more stable and effortless, achieving a "multi-purpose" technical effect.

[0019] Regarding the two-way unlocking mechanism: the pen is constructed to have a two-way impact response capability.

[0020] When the pen tip is impacted upwards, the inertial component moves towards the pen tail and directly impacts the locking mechanism.

[0021] When the pen tip is impacted downwards, the inertial component moves towards the pen tip and impacts the locking mechanism or an impact transmission part located on the pen tip side, thereby indirectly unlocking the locking mechanism. To achieve reliable indirect unlocking, the first mating part and / or the second mating part may be provided with a guide impact auxiliary slope. This auxiliary slope adopts a small-angle design, enabling the locking mechanism to achieve reverse unlocking through the impact force from the pen tip direction while possessing strong axial locking capability.

[0022] Regarding the manual unlocking mechanism: The pen also includes a manual unlocking mechanism configured to disengage the first mating part from the second mating part by manual operation of the user. This provides an alternative and conventional means of retrieving the core, in addition to the retrieving mechanism itself.

[0023] The manual unlocking mechanism may be at least one of the following: side-press type, rotary type, or press type.

[0024] The side-press manual unlocking mechanism includes a side-press core-collecting boss and a core-collecting through hole provided on the rod assembly. When the side-press core-collecting boss is pressed, the second mating part is driven to displace to release the lock.

[0025] The rotary manual unlocking mechanism includes a rotary unlocking assembly disposed on a first and / or second rod; when the first and second rods rotate relative to each other, the rotary unlocking assembly disengages the first and second mating parts. The rotary unlocking assembly may include a switching boss, an unlocking ramp, and / or an unlocking channel. To further optimize the rotary unlocking experience, the first and / or second mating parts may be provided with a mating ramp to provide a clear sense of engagement during core ejection and to allow the mechanism to temporarily disengage and re-engage under axial pressure.

[0026] Regarding the lead ejection method: The pen can be configured to eject and lock the lead by lifting or pressing the first and / or second rods. For example, the rods can be moved to the locked state by lifting the pen tip of the first rod or by pressing the dedicated pressing part located at the tail of the rod.

[0027] Regarding structural and reliability optimization: Anti-sway structure: An anti-sway structure (such as an anti-sway spring or guide rib groove) may be provided between the inertial component and the rod assembly to reduce the shaking and noise of the inertial component in the non-triggered state and improve the quality.

[0028] Transmission structure: A transmission structure (such as a transmission spring and / or transmission element) may be provided between the inertial component and the locking mechanism to more effectively transmit or convert inertial force.

[0029] Energy storage spring: An energy storage spring may also be provided between the inertial component and the rod assembly. When the pen is subjected to axial impact, the inertial component first compresses the energy storage spring, and then the rebound force of the energy storage spring drives the inertial component or transmission component to impact the locking mechanism with greater force or better timing. This "energy storage-release" mechanism can significantly improve the success rate and reliability of unlocking.

[0030] Reset element: The first mating part and / or the second mating part may also be connected to a reset element (such as a small spring) that drives the two to tend to engage, ensuring that the locking mechanism has a force that tends to maintain the lock in the non-unlocked state.

[0031] Pen refill positioning: The tail of the rod assembly may be provided with a pen refill inner hole positioning part for positioning the pen refill. This positioning part is used to accurately fix the tail end of the pen refill, reduce its swing, thereby ensuring the stability of the pen refill's movement trajectory and reducing the potential interference of the pen refill to the free movement of the inertial component.

[0032] The circumferential swing can also retract the core: the rod assembly and / or the pen core are also provided with a conversion part (H); the conversion part (H) can convert the axial impact of the inertial component into a circumferential impact, so that when the inertial component can move circumferentially and axially, it can affect the locking mechanism to retract the core.

[0033] This invention also protects the method of using the pen, which mainly includes two modes: Direct / indirect inertial unlocking method: Apply an axial sudden stop or acceleration motion to the pen in the lead-out locked state; the inertial component moves axially due to inertia and directly or indirectly impacts the locking mechanism; the impact force causes the first mating part to disengage from the second mating part, releasing the lock; under the restoring force of the return spring, the pen lead retracts.

[0034] The inertial rebound unlocking method involves applying an axial sudden stop or acceleration motion to the pen in the lead-out locked state; the inertial component moves axially due to inertia, compressing the energy storage spring in the opposite direction of the locking mechanism; when the energy storage spring rebounds after being compressed, it drives the inertial component or transmission component to impact the locking mechanism, thereby releasing the lock; subsequently, the pen lead retracts under the action of the reset spring.

[0035] Compared with existing technologies, the above technical solution has the following beneficial effects: I. Innovative Principle and Simplified Structure: The mechanism creatively utilizes the linear inertial impact of inertial components in the axial direction to directly unlock and lock the mechanism, eliminating the need for complex linkages, directional mechanisms, etc. The core triggering mechanism is simple, reliable, has fewer parts, is easy to manufacture and assemble, and has a low failure rate.

[0036] II. All-round automatic protection: Through the ingenious two-way unlocking design, the retractor can be effectively triggered regardless of whether the pen falls with the tip facing up or down, providing all-round passive safety protection.

[0037] III. Diverse operating modes: Based on the core inertial core winding mechanism, multiple manual unlocking methods such as side pressure, rotation, and pressing can be flexibly selected, and multiple core ejection methods such as lifting and pressing can be realized, which greatly enriches the product's functionality and user experience and meets the preferences of different users.

[0038] IV. Dual technical effects and optimized experience: The inertial component is naturally located in the grip area when writing, which effectively lowers the writing center of gravity, making writing more stable and comfortable, achieving "one component, two effects" (trigger protection and optimized center of gravity).

[0039] V. Significantly Enhanced Reliability: By adding optimized structures such as anti-sway, transmission, and energy storage, the stability of inertial component movement and the reliability of unlocking action are effectively improved, ensuring that the automatic protection function can be effectively triggered under various conditions. Attached Figure Description

[0040] Figure 1 This is an exploded view of Embodiment 1 of the present invention.

[0041] Figure 2 This is a front view full sectional view of the core ejection process in Embodiment 1 of the present invention.

[0042] Figure 3 This is a front view full sectional view of the core receiving in Embodiment 1 of the present invention.

[0043] Figure 4 This is a three-dimensional sectional view of Embodiment 2 of the present invention.

[0044] Figure 5 This is a front view full sectional view of the core ejection process in Embodiment 2 of the present invention.

[0045] Figure 6 This is a front view full sectional view of the core receiving in Embodiment 2 of the present invention.

[0046] Figure 7 This is an exploded view of Embodiment 3 of the present invention.

[0047] Figure 8 This is a partial enlarged view of Embodiment 3 of the present invention.

[0048] Figure 9 This is a cross-sectional view and a partial enlarged view of the first member 1 in Embodiment 3 of the present invention.

[0049] Figure 10 This is a front view full sectional view of the core ejection process in Embodiment 4 of the present invention.

[0050] Figure 11 This is a partial enlarged view of Embodiment 5 of the present invention.

[0051] Figure 12 This is a cross-sectional view and a partial enlarged view of the first member 1 in Embodiment 5 of the present invention.

[0052] Figure 13 This is a perspective view of the second rod limiting member 2B in Embodiment 5 of the present invention.

[0053] Figure 14 This is a partial enlarged view of Embodiment 6 of the present invention.

[0054] Figure 15 This is a partial enlarged view of Embodiment 7 of the present invention. Figure 16 This is a front sectional view of the core extraction process in Embodiment 8 of the present invention. Figure 17 This is a partial perspective view of Embodiment 8 of the present invention.

[0055] Figure label: 1. First rod; 2. Second rod; 2A. Main body of the second rod; 2B. Limiting component of the second rod; 3. Inertial component; 4. Pen refill; 5. Return spring; 11. First mating part; 12. Reset slope; 13. Core-receiving limiting platform; 21. Second mating part; 22. Positioning boss; Z, Impact transmission section; G, Guided impact auxiliary slope; 6. Side-pressed core-gathering boss; C. Core-gathering through hole; D. Switch boss; E. Unlock side slope; E1. Unlock channel; X, Energy storage spring; F, Anti-sway spring; Y, Pressing part; A, Pen refill inner hole positioning part; B, Reset part. Detailed Implementation

[0056] The present invention will now be further described with reference to the accompanying drawings. Example 1

[0057] like Figures 1 to 3 The pen shown includes a pen core 4, a return spring 5, and a lever assembly. The lever assembly includes a first lever 1 and a second lever 2, which are axially movable relative to each other and have a maximum extension limit.

[0058] The pen refill 4 is located inside the rod assembly, mainly within the first rod 1.

[0059] The return spring 5 provides the return force for the retractor, specifically located between the front end of the first rod 1 and the writing end of the pen refill 4.

[0060] The locking mechanism includes a first mating part 11 and a second mating part 21. The first mating part 11 is a boss, and the second mating part 21 is an elastic pawl. They are locked by mechanical engagement.

[0061] The inertial unlocking component includes an inertial element 3, whose movable channel is parallel to the axis of the pen refill 4, is housed in the cavity of the rod assembly, and can move up and down.

[0062] The inertial component 3 is mounted on the first member 1.

[0063] The pen is configured such that when the pen tip is impacted upwards, the inertial component 3 moves towards the pen tail and impacts the locking mechanism; when the pen tip is impacted downwards, the inertial component 3 moves towards the pen tip and impacts the locking mechanism or the impact transmission part Z, thereby indirectly unlocking the pen.

[0064] The second mating part 21 is provided with a mating ramp H for easy unlocking.

[0065] The inertial component 3 naturally rests near the pen's grip area W during writing to reduce interference.

[0066] The pen can be extended and locked by lifting or pressing the first lever 1.

[0067] The pen is operated as follows: Core ejection: Core ejection and locking are achieved by lifting the first rod 1; Core retraction: When subjected to axial impact, the impact locking mechanism of inertial component 3 achieves core retraction. Example 2

[0068] like Figures 4 to 6 The pen shown has a second rod 2, which, compared to embodiment 1, includes a second rod body 2A and a second rod limiting member 2B, which can move relative to each other axially.

[0069] The second rod limiting member 2B has maximum extension and retraction limitation with both the second rod body 2A and the first rod member 1.

[0070] The first rod 1 and the second rod limiting member 2B can move relative to each other axially.

[0071] The first mating part 11 and the second mating part 21 are provided with a mating jump slope H.

[0072] The first rod 1 is equipped with two inertial elements 3, and an energy storage spring X is provided between the two inertial elements 3. Through the action of the energy storage spring X, the shaking is reduced and the force is transmitted.

[0073] When the pen is subjected to axial impact, the inertial component 3 compresses the energy storage spring X, and the rebound force of the energy storage spring X drives the inertial component 3 to impact the locking mechanism.

[0074] In terms of usage, the core-retracting mechanism under the action of the energy storage spring X is changed to: applying an axial emergency stop or acceleration motion to the pen in the core-locked state; The inertial component 3 moves axially due to inertia, compressing the energy storage spring X in the opposite direction to the locking mechanism; When the energy storage spring X is compressed and rebounds, it drives the inertial component 3 or the transmission component 7 to impact the locking mechanism, causing the first mating part 11 to disengage from the second mating part 21 and releasing the lock. Under the restoring force of the return spring 5, the first rod 1 and the second rod 2 move relative to each other, driving the pen refill 4 to retract and achieve the retraction of the pen refill. Example 3

[0075] like Figures 7 to 9 The pen shown includes a first rod 1, a second rod 2, a pen core 4, a return spring 5, and an inertial component 3. The second rod 2 consists of a second rod body 2A and a second rod body limiting component 2B, which can move relative to each other axially.

[0076] This embodiment is provided with two return springs 5. One return spring 5 is specifically located between the front end of the first rod 1 and the writing end of the pen tip; the other return spring is specifically located between the second rod limiting member 2B and the tail end of the first rod 1. When the pen tip is ejected, the position of the second rod body 2A can be kept close to the writing end.

[0077] When the pen is impacted, the inertial component 3 acts directly or indirectly on the locking mechanism due to inertial force, causing the first mating part 11 and the second mating part 21 to disengage, thereby releasing the lock and realizing the retraction of the pen.

[0078] The first mating part 11 on the first rod 1 and the second mating part 21 on the second rod limiting member 2B are magnetically mated.

[0079] The pen has a rotation unlock and reset function. By manually rotating the second rod limiting member 2B, the rotational force is greater than the magnetic positioning force, causing the first mating part 11 to disengage from the second mating part 21. Under the guidance of the reset slope 12 and the restriction of the core-retracting limiting platform 13, the positioning boss 22 on the second rod limiting member 2B resets the second rod limiting member 2B and the first rod 1 to the initial core-retracting state.

[0080] The inertial component 3 is mounted on the outside of the pen refill 4, and its movement channel coincides with the axis of the pen refill.

[0081] The first mating part 11 is provided with a mating ramp H to facilitate alignment during locking.

[0082] The pen has a refill positioning part A at the end to precisely fix the position of the refill 4. When writing, the inertial component 3 naturally stays near the grip area W to avoid affecting the writing balance.

[0083] The pen is operated as follows: Core ejection: The core is ejected and magnetically locked by lifting the first rod 1 or pressing the second rod limiting member 2B.

[0084] Core retraction: The core can be manually unlocked by rotating the second rod limiting member 2B; or the core can be retracted by the impact locking mechanism of the inertial member 3 when subjected to axial impact. Example 4

[0085] like Figure 10 The pen shown is an improvement on embodiment 3, employing a mechanical locking mechanism. The first mating part 11 is a boss, and the second mating part 21 is an elastic claw; the two achieve mechanical locking through surface-to-surface constraint and engagement.

[0086] The second mating part 21 is connected to a reset member B, which is a small spring that continuously provides a restoring force to the elastic pawl toward the locked position.

[0087] An energy storage spring X is provided between the inertial component 3 and the rod assembly. When the pen is impacted, the inertial component 3 first compresses the energy storage spring X to store energy, and then accelerates the impact on the locking mechanism under the action of the spring's rebound force.

[0088] The energy storage spring X serves to reduce swaying and transmit force.

[0089] The rotation unlock and reset function allows the second rod body limiting member 2B to be manually rotated, causing the second mating part 21 to rotate at a certain angle and disengage from the boss of the first mating part 11. Under the guidance of the reset slope 12 and the restriction of the core-collecting limiting platform 13, the second rod body limiting member 2B and the first rod 1 are reset to the initial core-collecting state. Example 5

[0090] like Figures 11 to 13 The pen shown differs from that in Embodiment 4 in that the reset component B is omitted.

[0091] The rotation unlocking and reset function includes a switching boss D and an unlocking channel E1 provided on the first rod 1, and an unlocking side slope E provided on the first rod 1 and the second rod limiting member 2B.

[0092] Rotating the second rod limiting member 2B, under the action of the unlocking side slope E, causes the second mating part 21 to pass over the switching boss D and reach the unlocking channel E1, thereby realizing the reset of the second rod limiting member 2B and the first rod member 1 to the initial state of core retraction.

[0093] A side-pressure unlocking mechanism has been added, including a side-pressure core-gathering boss 6 and a core-gathering through hole C provided on the rod assembly. When the side-pressure core-gathering boss 6 is pressed, the second mating part 21 is driven to displace to release the lock. Example 6

[0094] like Figure 14 The pen shown has an optimized impact transmission path based on Example 5.

[0095] A transmission component 7 is provided between the inertial component 3 and the locking mechanism. This transmission component 7 is made of a lightweight, impact-resistant plastic material.

[0096] When the pen is subjected to axial impact, the inertial component 3 moves towards the energy storage spring X and compresses the spring. The energy stored in the energy storage spring X is transmitted to the locking mechanism through the transmission component 7. This two-stage transmission structure ensures the effective transmission of impact force while avoiding damage that may be caused by direct impact on the inertial component 3. Example 7

[0097] like Figure 15 The pen shown is an improvement on embodiment 3. It adopts a composite mechanism of magnetic attraction and mechanical engagement. The mechanical engagement is assisted by the guide impact auxiliary slope G provided on the first rod 1, so that the magnetic engagement between the first mating part 11 and the second mating part 21 does not easily disengage.

[0098] The rotation unlocking and reset function includes a switching boss D and an unlocking channel E1 provided on the first rod 1, and an unlocking side slope E provided on the first rod 1 and the second rod limiting member 2B.

[0099] Rotating the second rod limiting member 2B, under the action of the unlocking side slope E, causes the second mating part 21 to pass over the switching boss D and reach the unlocking channel E1, thereby realizing the reset of the second rod limiting member 2B and the first rod member 1 to the initial state of core retraction.

[0100] The pen has a dual impact transmission system consisting of an energy storage spring X and a transmission component 7.

[0101] The energy storage spring X rebounds and drives the transmission component 7 to impact. Through the guide impact auxiliary slope G, the axial impact is converted into radial displacement, releasing the engagement and overcoming the magnetic attraction. Example 8

[0102] like Figures 16-17 The pen shown is an improvement on embodiment 7. The energy storage spring X and the integral inertial component 3 are modified into multiple small inertial components 3. The pen core 4 is provided with a conversion part I. When the pen changes from a non-horizontal state to a horizontal state, the multiple small inertial components 3 are affected by the conversion slope on the conversion part I and roll. The potential energy from high to low is converted into an axial impact on the transmission component, causing the transmission component to move axially, thereby driving the second mating part 21 to move to release the lock.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pen, comprising a refill (4), a return spring (5), and a lever assembly, The rod assembly includes a first rod (1) and a second rod (2) that are movable relative to each other in the axial direction, the first rod (1) and the second rod (2) having maximum extension limit; At least a portion of the pen refill (4) is disposed inside the rod assembly; The return spring (5) is used to provide a return force that causes the pen lead (4) to tend toward the retracted state; Its features are: Also includes: A locking mechanism is used to resist the force of the return spring (5) in the core-out state, so that the first rod (1) and the second rod (2) remain relatively fixed; the locking mechanism includes a first mating part (11) and a second mating part (21) that can cooperate to lock each other, one of the first mating part (11) and the second mating part (21) is disposed on the first rod (1) and the other is disposed on the second rod (2); An inertial unlocking component, including at least an inertial component (3); Apply an axial sudden stop or acceleration motion to the pen that is in the lead-out locked state; The inertial component (3) moves axially due to inertia and directly or indirectly impacts the locking mechanism; The impact force causes the first mating part (11) to disengage from the second mating part (21), thus releasing the lock; Under the action of the reset force of the reset spring (5), the first rod (1) and the second rod (2) move relative to each other, driving the pen refill (4) to retract and achieve the refill.

2. A pen, comprising a refill (4), a return spring (5), and a lever assembly, The rod assembly includes a first rod (1) and a second rod (2) that are movable relative to each other in the axial direction, the first rod (1) and the second rod (2) having maximum extension limit; At least a portion of the pen refill (4) is disposed inside the rod assembly; The return spring (5) is used to provide a return force that causes the pen lead (4) to tend toward the retracted state; Its features are: Also includes: A locking mechanism is used to resist the force of the return spring (5) in the core-out state, so that the first rod (1) and the second rod (2) remain relatively fixed; the locking mechanism includes a first mating part (11) and a second mating part (21) that can cooperate to lock each other, one of the first mating part (11) and the second mating part (21) is disposed on the first rod (1) and the other is disposed on the second rod (2); An inertial unlocking assembly includes at least an inertial element (3); the active channel of the inertial element (3) is substantially coincident with the axis of the pen refill (4); An energy storage spring (X) is also provided between the inertial component (3) and the rod assembly. Apply an axial sudden stop or acceleration motion to the pen that is in the lead-out locked state; The inertial component (3) moves axially due to inertia, compressing the energy storage spring (X) in the opposite direction to the locking mechanism. When the energy storage spring (X) is compressed and rebounds, it drives the inertial component (3) to directly or indirectly impact the locking mechanism, causing the first mating part (11) to disengage from the second mating part (21) and release the lock; Under the action of the reset force of the reset spring (5), the first rod (1) and the second rod (2) move relative to each other, driving the pen refill (4) to retract and achieve the refill.

3. The pen according to claim 1 or 2, characterized in that: The second rod (2) includes a second rod body (2A) and a second rod limiting member (2B) that can move relative to each other in the axial direction; the second rod limiting member (2B) has maximum extension and retraction limitation with both the second rod body (2A) and the first rod (1); the first rod (1) and the second rod limiting member (2B) can move relative to each other in the axial direction.

4. The pen according to claim 1 or 2, characterized in that: The first mating part (11) and the second mating part (21) are mated by magnetic attraction, mechanical engagement, or a combination of magnetic attraction and mechanical engagement.

5. The pen according to claim 4, characterized in that: The locking mechanism is a composite mechanism of magnetic attraction and mechanical engagement, wherein the magnetic attraction force is used to assist docking and provide axial holding force, and the mechanical engagement force is used to provide circumferential limiting.

6. The pen according to claim 4, characterized in that: The first mating part (11) is a first magnet, and the second mating part (21) is a second magnet or magnetic material part that can be attracted to the first magnet.

7. The pen according to claim 4, characterized in that: The first mating part (11) is a boss, and the second mating part (21) is an elastic claw that can engage with the boss.

8. The pen according to claim 1 or 2, characterized in that: The inertial element (3) is housed in the cavity of the rod assembly and is movable therein.

9. The pen according to claim 1 or 2, characterized in that: The inertial element (3) is sleeved on the first rod (1), the second rod (2) and / or the pen refill (4), and can move relative to the pen refill (4).

10. The pen according to claim 1 or 2, characterized in that: The pen is configured such that when its tip is impacted upwards, the inertial element (3) moves towards the tail of the pen and impacts the locking mechanism; when its tip is impacted downwards, the inertial element (3) moves towards the tip of the pen and impacts the locking mechanism or an impact transmission part (Z) disposed on the tip side, thereby indirectly unlocking the locking mechanism.

11. The pen according to claim 1 or 2, characterized in that: It also includes a manual unlocking mechanism, which is configured to disengage the first mating part (11) from the second mating part (21) by manual operation of the user.

12. The pen according to claim 11, characterized in that: The manual unlocking mechanism is at least one of the following: side-press type, rotary type, or press type.

13. The pen according to claim 12, characterized in that: The manual unlocking mechanism is a side-press type, which includes a side-press core-collecting boss (6) and a core-collecting through hole (C) provided on the rod assembly. When the side-press core-collecting boss (6) is pressed, the second mating part (21) is driven to move to release the lock.

14. The pen according to claim 12, characterized in that: The manual unlocking mechanism is a rotary type, which includes a rotary unlocking component disposed on the first rod (1) and / or the second rod (2); when the first rod (1) and the second rod (2) rotate relative to each other, the first mating part (11) and the second mating part (21) are disengaged by the rotary unlocking component; the rotary unlocking component includes a switching boss (D), an unlocking ramp (E) and / or an unlocking channel (E1).

15. The pen according to claim 1 or 2, characterized in that: The first mating part (11) and / or the second mating part (21) are provided with a mating ramp (H).

16. The pen according to claim 1 or 2, characterized in that: The inertial element (3) naturally stops near the pen's grip area (W) during writing.

17. The pen according to claim 1 or 2, characterized in that: The pen is configured to extend and lock the core by pulling or pressing the first rod (1) and / or the second rod (2).

18. The pen according to claim 1 or 2, characterized in that: An anti-sway structure is also provided between the inertial component (3) and the rod assembly.

19. The pen according to claim 1 or 2, characterized in that: A transmission structure is also provided between the inertial component (3) and the locking mechanism.

20. The pen according to claim 1 or 2, characterized in that: The rod assembly also includes a transmission component (7).

21. The pen according to claim 1 or 2, characterized in that: The first mating part (11) and / or the second mating part (21) are provided with a guide impact auxiliary slope (G).

22. The pen according to claim 1 or 2, characterized in that: The tail of the rod assembly is also provided with a pen refill inner hole positioning part (A) for positioning the pen refill (4).

23. The pen according to claim 1 or 2, characterized in that: The first mating part (11) and / or the second mating part (21) are also connected to a reset member (B) that drives the two to tend to engage.

24. The pen according to claim 1 or 2, characterized in that: The rod assembly and / or the pen refill are also provided with a conversion part (I).

25. The pen according to claim 1 or 2, characterized in that: The moving channel of the inertial component is relatively parallel to the axis of the pen refill.

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