Gravity refill discharging pen

Abstract

The utility model discloses a gravity refill outlet pen which comprises a pen holder, a refill and a refill self-locking mechanism, the refill self-locking mechanism is supported at the rear end of the refill, a first spring is arranged between the front end of the refill and the pen holder, the refill self-locking mechanism comprises a sleeve, a connecting rod, a balancing weight, a sliding block and a second spring, and a window is arranged on the side portion of the sleeve. The sliding block is transversely and movably arranged at the window of the sleeve, the front end of the connecting rod is movably arranged on the inner side of the sleeve in a penetrating mode and is in transmission connection fit with the sliding block, the rear end of the connecting rod is connected with the balancing weight, and the second spring acts between the sleeve and the connecting rod. The connecting rod can drive the sliding block to transversely move outwards and inwards along the window of the sleeve when moving forwards and backwards relative to the sleeve, and the sliding block is matched with the inner wall of the pen holder in an abutting mode when stretching out. The gravity refill outlet pen has the advantages of being few in parts and simple in structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gravity core pen. BACKGROUND

[0002] There is a kind of pen on the market that can realize automatic core extension according to gravity, when the pen is vertically placed, the core is automatically extended under the action of gravity and kept in the core extension state, thereby facilitating writing, when the pen is horizontally or vertically placed, the core is automatically retracted into the pen barrel, realizing automatic core retraction, which can reduce user operation and is more convenient to use.

[0003] The existing gravity core pen has two types, one type adopts the scheme shown in the connecting rod structure of the automatic reset pen (CN221698336U) of Chinese utility model patent, including core, shell, counterweight, reset structure, transmission assembly and locking piece, the transmission assembly is composed of first connecting piece, connecting rod, rotating piece and second connecting piece connected in sequence, and the extension or retraction of the core is realized by the cooperation of the counterweight, reset structure and transmission assembly, the other type adopts the scheme shown in the ball locking structure of the writing tool with telescopic part (CN106274162B) of Chinese utility model patent, the writing tool has advance and retreat component, rolling body and the like, the rolling body is in contact with the side surface of the advance and retreat component, and the extension and locking of the telescopic part are realized by the assembly such as the clamping and detaching component.

[0004] The two types of pens described above have high complexity and higher requirements for manufacturing and assembly process. UTILITY MODEL CONTENTS

[0005] In order to overcome the defects of the prior art, the utility model provides a gravity core pen with fewer components and simpler structure.

[0006] The gravity core pen of the utility model comprises a pen barrel, a core arranged in the pen barrel and a core self-locking mechanism, the core self-locking mechanism is supported at the rear end of the core and can move in the front-rear direction of the pen, a first spring is arranged between the front end of the core and the pen barrel, the core self-locking mechanism comprises a sleeve, a connecting rod, a counterweight block, a sliding block and a second spring, the side of the sleeve is provided with a window, the sliding block is horizontally movably arranged at the window of the sleeve, the front end of the connecting rod is movably arranged on the inner side of the sleeve in the front-rear direction and is in transmission connection with the sliding block, the rear end of the connecting rod is connected with the counterweight block, the counterweight block is preferably made of metal material, the second spring acts between the sleeve and the connecting rod and is used for driving the connecting rod to move backward relative to the sleeve, when the connecting rod moves forward and backward relative to the sleeve, the sliding block can be driven to move outward and inward in the horizontal direction along the window of the sleeve respectively, the sliding block abuts against the inner wall of the pen barrel when being extended, and a limiting portion that cooperates with the front end of the sleeve to limit is arranged on the inner side of the pen barrel.

[0007] When the pen is needed to be used, the pen is vertically placed, the ink cartridge and the ink cartridge self-locking mechanism move forward under the action of gravity against the elastic force of the first spring, the ink cartridge extends from the front end of the pen barrel, and the front end of the sleeve moves to the position limited by the limiting portion during the forward movement of the ink cartridge self-locking mechanism. The counterweight and the connecting rod move forward relative to the sleeve under the action of gravity against the elastic force of the second spring, and simultaneously drive the sliding block to extend outward and transversely through the window of the sleeve. The sliding block and the inner wall of the pen barrel form an abutting fit. During writing, the abutting fit between the sliding block and the inner wall of the pen barrel can lock the ink cartridge at the ink cartridge extension position and prevent the ink cartridge from retreating due to writing pressure. When the pen is not used, the pen is horizontally placed, the gravity direction of the ink cartridge and the ink cartridge self-locking mechanism is no longer in the same direction as the elastic force direction of the first and second springs, the counterweight and the connecting rod move backward relative to the sleeve under the action of the second spring, the sliding block moves inward and transversely, and the ink cartridge and the ink cartridge self-locking mechanism move backward under the action of the first spring, thereby realizing the automatic ink cartridge retraction function.

[0008] Compared with the prior art, the above-mentioned scheme for realizing automatic extension and retraction of the ink cartridge has fewer components, a simple structure, and simple assembly and processing of the components, and is strong in reliability and less likely to be stuck.

[0009] Further, the sliding block comprises a sleeving portion and an abutting portion, the abutting portion is arranged on one side of the sleeving portion, the sleeving portion and the connecting rod form an active sleeving fit, the side portion of the sleeving portion is provided with an inclined guide groove, the connecting rod is provided with a convex shaft which forms a guide movement fit with the guide groove, and the connecting rod moves forward and backward relative to the sliding block, and the convex shaft and the guide groove cooperate to link the transverse movement of the sliding block.

[0010] Further, the two sides of the sleeving portion are symmetrically provided with guide grooves which penetrate the inner and outer sides of the sleeving portion, the connecting rod is provided with a connecting hole, the convex shaft is formed by the two ends of a metal rod which is fixedly inserted into the connecting hole, and the connecting rod is inserted into the sleeving portion during assembly, and then the metal rod is inserted into the connecting hole of the connecting rod along the guide groove to be positioned, so that the structure is simple and the assembly is convenient.

[0011] Further, the inner side of the sleeve is provided with an annular baffle wall near the rear end, an active cavity is formed between the rear end of the sleeve and the annular baffle wall, the rear end of the connecting rod is provided with a connecting block which is movably arranged in the active cavity, the connecting rod is connected and fitted with the front end of the counterweight through the connecting block, and the second spring is sleeved on the connecting rod and abuts against the annular baffle wall and the connecting block, so that the overall structure is simple and compact, and the stable force direction of the second spring is ensured.

[0012] Further, the rear end of the connecting block is provided with a plug hole, and the front end of the counterweight block is provided with a plug block which is plugged and positioned in cooperation with the plug hole, so that the counterweight block and the connecting rod are fixedly matched, and the counterweight block can be prevented from shaking.

[0013] Further, the pen barrel comprises a front section, a rear section and a connecting section, the front end of the connecting section is screwed to the rear end of the inner hole of the front section, and the rear end of the connecting section is plugged and positioned in the front end of the inner hole of the rear section, the limiting part is formed by the rear end of the connecting section, the rear end side of the connecting section and the inner hole side wall of the rear section are circumferentially limited and matched with a sliding groove and a convex strip which are arranged along the front-rear direction of the pen, during installation, the rear end of the connecting section is first inserted into the rear section of the pen barrel, and when the rear section is rotated relative to the front section, the screwing cooperation between the front end of the connecting section and the front section is realized, the operation is convenient, the rear end side of the connecting section and the inner hole side wall of the rear section are axially limited and matched with two annular convex ribs which are arranged along the circumferential direction of the pen, so that the rear end of the connecting section can be prevented from being pulled out of the inner hole of the rear section.

[0014] Further, the front part of the pen barrel is provided with a cylindrical counterweight (including an annular shape), the cylindrical counterweight is arranged on the inner side of the pen barrel and is sleeved on the outer side of the pen core, the cylindrical counterweight can be a metal wire which is spirally wound, and the cylindrical counterweight is arranged for adjusting the center of gravity of the pen and improving the writing feeling.

[0015] Further, the rear end side of the pen barrel is provided with a pen clip which can move forward and backward relative to the pen barrel, a clamping piece is movably arranged between the pen clip and the pen barrel, the side part of the pen barrel is provided with an opening, when the pen clip moves relative to the pen barrel, the clamping end of the clamping piece can be driven to extend into the inner side of the pen barrel or retract, the side front part and the side rear part of the counterweight block each comprise a limiting part which can form clamping and positioning cooperation with the clamping end of the clamping piece when the clamping end extends into the inner side of the pen barrel, the front edge part of the counterweight block can be used as the limiting part of the side front part, and the annular groove formed in the middle part of the counterweight block can be used as the limiting part of the side rear part. When the clamping end of the clamping piece and the limiting part of the counterweight block are clamped and matched, the counterweight part can be kept at the current position, so that the pen core can be kept at the core extension or core retraction position, and is not affected by the posture of the pen, for example, the pen core can still be kept at the core extension position when the pen is placed horizontally, and the pen core can still be kept at the core retraction position when the pen is placed vertically, and especially, the pen core can be prevented from automatically extending out when the pen is carried.

[0016] Further, the clamping piece is a metal elastic sheet arranged between the pen clip and the pen barrel, one end of the metal elastic sheet is a clamping end, the other end is a fixed end, a bending part is formed between the clamping end and the fixed end, the fixed end is fixed to the inner side of the pen clip, a notch is formed between the pen clip and the pen barrel for the bending part of the metal elastic sheet, the notch is arranged at a position close to the opening of the side of the pen barrel, the notch comprises a side wall adjacent to the opening, and the clamping end and the side wall form an elastic compression fit. When the pen clip moves forward and backward relative to the pen barrel, the metal elastic sheet can also move forward and backward relative to the pen barrel, since the clamping end of the metal elastic sheet is in compression contact with the side wall of the notch, the metal elastic sheet can move along the side wall with the movement of the pen clip, and when the metal elastic sheet moves to the opening, the metal elastic sheet extends into the inner side of the pen barrel under the elastic force of the metal elastic sheet, and the metal elastic sheet can cooperate with the counterweight.

[0017] Further, a positioning convex rib is arranged on the side wall of the notch, and the clamping end is provided with a positioning groove matched with the positioning convex rib. Through the cooperation of the positioning convex rib and the positioning groove, the positioning between the metal elastic sheet and the pen barrel can be formed, and the pen clip and the pen barrel can also be kept in position, so that shaking of the pen clip and the pen barrel is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The figure is an assembly diagram of the embodiment of the utility model;

[0019] Figure 2 The figure is an assembly diagram of the refill self-locking mechanism of the embodiment of the utility model;

[0020] Figure 3 The figure is an assembly diagram of the sliding block and the connecting rod of the embodiment of the utility model;

[0021] Figure 4 The figure is an assembly diagram of the pen clip and the pen barrel of the embodiment of the utility model;

[0022] Figure 5 The figure is an assembly diagram of the pen clip and the metal elastic sheet of the embodiment of the utility model;

[0023] Figure 6 The figure is a structure diagram of the connecting section of the pen barrel of the embodiment of the utility model;

[0024] Figure 7 The figure is a partial sectional view of the shrinked refill state of the embodiment of the utility model;

[0025] Figure 8 The figure is a partial sectional view of the core ejection state of the embodiment of the utility model;

[0026] Figure 9 The figure is a partial sectional view of the first locking state of the corresponding counterweight of the embodiment of the utility model;

[0027] Figure 10A partial sectional view of a second locking state of the counterweight block corresponding to the embodiment of the utility model. DETAILED DESCRIPTION

[0028] The structure of the gravity core pen is shown in the drawing. Figures 1-10 The first spring 3 is arranged between the front end of the core 2 and the pen barrel, the core self-locking mechanism comprises a sleeve 41, a connecting rod 42, a counterweight block 43, a sliding block 44 and a second spring 45, the side of the sleeve 41 is provided with a window 411, the sliding block 44 is horizontally movably arranged at the window 411 of the sleeve 41, the front end of the connecting rod 42 movably penetrates the inside of the sleeve 41 in the front-rear direction and is in transmission connection with the sliding block 44, the rear end of the connecting rod 42 is connected with the counterweight block 43, the second spring 45 acts between the sleeve 41 and the connecting rod 42 and is used for driving the connecting rod 42 to move rearward relative to the sleeve 41, when the connecting rod 42 moves forward and rearward relative to the sleeve 41, the sliding block 44 can be driven to move outward and inward transversely along the window 411 of the sleeve 41 respectively, the sliding block 44 is in abutting connection with the inner wall of the pen barrel when the sliding block 44 is extended, and the inside of the pen barrel is provided with a limiting portion which is used for limiting the front end of the sleeve 41.

[0029] When the pen is needed to be used, the pen is vertically arranged, the core self-locking mechanism and the core 2 move forward under the action of gravity and against the elastic force of the first spring 3, so that the core 2 is extended from the front end of the pen barrel, when the front end of the sleeve 41 moves to the position limited by the limiting portion in the process of moving forward, the counterweight block 43 and the connecting rod 42 move forward relative to the sleeve 41 under the action of gravity and against the elastic force of the second spring 45, and simultaneously drive the sliding block 44 to extend outward transversely along the window 411 of the sleeve 41, the sliding block 44 is in abutting connection with the inner wall of the pen barrel, in the writing process, the core 2 can be locked at the core extension position because of the damping between the sliding block 44 and the inner wall of the pen barrel, and the core 2 can be prevented from retreating due to the writing pressure, when the pen is not used, the pen is horizontally arranged, the gravity direction of the core 2 and the core self-locking mechanism is not in the same direction as the elastic force direction of the first spring 3 and the second spring 45, the counterweight block 43 and the connecting rod 42 move rearward relative to the sleeve 41 under the action of the second spring 45, so that the sliding block 44 is retracted inward transversely, the locking between the sliding block 44 and the pen barrel is released, and the core and the core self-locking mechanism move rearward under the action of the first spring 3, so that the automatic core retracting function is realized.

[0030] Compared with the prior art, the above-mentioned scheme for realizing the automatic extension and retraction of the core has the advantages of fewer components, simple structure, simple assembly and processing of components, high reliability and low probability of being stuck.

[0031] AsFigure 2 、 3 As shown in the drawings, the slider 44 comprises a sleeving part 441 and an abutting part 442, the abutting part 442 is arranged at one side of the sleeving part 441, the sleeving part 441 and the connecting rod 42 are movably sleeved and matched, two sides of the sleeving part 441 are symmetrically provided with inclined guide grooves 443, the guide grooves 443 penetrate the inside and outside of the sleeving part 441, the connecting rod 42 is provided with convex shafts matched with the guide grooves 443 in a guided movement, when the connecting rod 42 moves forward and backward relative to the slider 44, the slider 44 moves laterally through the linkage of the convex shafts and the guide grooves 443, the connecting rod 42 is provided with a connecting hole 421, the convex shafts are composed of two ends of a metal rod 422 fixedly inserted into the connecting hole 421, during assembly, the connecting rod 42 is inserted into the sleeving part 441 first, then the metal rod 422 is inserted into the connecting hole 421 of the connecting rod 42 along the guide grooves 443 to be installed and positioned, the structure is simple and the assembly is convenient.

[0032] The inside of the sleeve 41 is provided with an annular baffle 412 near the rear end, the rear end of the sleeve 41 and the annular baffle 412 form a movable cavity, the rear end of the connecting rod 42 is provided with a connecting block 423, the connecting block 423 is movably arranged in the movable cavity, the connecting rod 42 is connected and matched with the front end of the counterweight block 43 through the connecting block 423, the second spring 45 is sleeved on the connecting rod 42 and is respectively matched with the annular baffle 412 and the connecting block 423 in abutment, the overall structure is simple and compact, and the stability of the force direction of the second spring 45 is ensured.

[0033] The rear end of the connecting block 423 is provided with a plug-in hole, the front end of the counterweight block 43 is provided with a plug-in block matched with the plug-in hole to be plug-in positioned, the fixed matching of the counterweight block 43 and the connecting rod 42 is realized, and the shaking of the counterweight block 43 can be avoided; the front end of the sleeve 41 is provided with a positioning hole matched with the rear end of the pen core 2 to be plug-in positioned, the relative fixation between the sleeve 41 and the pen core 2 is realized, and the matching effect is improved.

[0034] As shown in the drawings, Figure 1 、 6, 7, 8, the pen shaft includes a front section 11, a rear section 13 and a connecting section 12, the front end of the connecting section 12 is screwed into the rear end of the inner hole of the front section 11, the rear end of the connecting section 12 is inserted and positioned in the front end of the inner hole of the rear section 13, the limiting part is formed by the rear end of the connecting section 12 (for limiting the maximum distance of the sleeve 41 moving forward), the rear end side of the connecting section 12 and the inner hole side wall of the rear section 13 are circumferentially limited and matched with the sliding groove and the convex strip 121 arranged along the front and rear directions of the pen, during installation, the rear end of the connecting section 12 can be inserted into the rear section 13 of the pen shaft first, when the rear section 13 is rotated relative to the front section 11, the screwing cooperation between the front end of the connecting section 12 and the front section 11 can be realized due to the circumferential limitation of the connecting section 12 and the rear section 13, the operation is relatively convenient, the rear end side of the connecting section 12 and the inner hole side wall of the rear section 13 are axially limited and matched with the two annular convex ribs arranged along the circumference of the pen, the connecting section 12 and the pen shaft are matched by the annular convex rib 122 of the rear end side of the connecting section 12 to form axial limitation (i.e. limitation along the length direction of the pen), which can prevent the rear end of the connecting section 12 from coming out of the inner hole of the rear section 13 forwardly.

[0035] The front part of the pen shaft is provided with a cylindrical counterweight 5 (including an annular shape), the cylindrical counterweight 5 is arranged inside the pen shaft and is sleeved outside the pen core 2, the cylindrical counterweight 5 can be a metal wire spirally wound and formed, such as Figure 1 、 7 , 8. The setting of the cylindrical counterweight 5 is used for adjusting the center of gravity of the pen and improving the writing feeling.

[0036] As shown in Figure 4 、 5 , 9, 10, the rear end side of the pen shaft (i.e. the rear section 13) is provided with a pen clamp 6, the pen clamp 6 can move forward and backward within a certain range relative to the pen shaft, a clamping piece 7 is movably arranged between the pen clamp 6 and the pen shaft, the side part of the pen shaft is provided with an opening 131, when the pen clamp 6 moves forward relative to the pen shaft, the clamping end 71 of the clamping piece 7 can be driven to extend into the inside of the pen shaft along the opening 131, and when it moves backward, the clamping end 71 is retracted along the opening 131, the side front part and the side rear part of the counterweight 43 each include a positioning part which can form clamping positioning cooperation with the clamping end 71 of the clamping piece 7 when the clamping end 71 extends into the inside of the pen shaft, in this embodiment, the front end edge part of the counterweight 43 serves as the positioning part of the side front part of the counterweight 43, and the annular groove 431 opened in the middle part of the counterweight 43 serves as the positioning part of the side rear part of the counterweight 43. When the clamping end 7 of the clamping piece 7 and the positioning part of the counterweight 43 are clamped and matched, the counterweight 43 can be kept at the current position, as shown in Figure 9 , when the counterweight 43 is at the rear position (a position corresponding to the retracted core state), the front end edge part of the counterweight 43 is clamped and positioned by the clamping end 71, since the pen clamp 6 is at the front position, it cannot continue to move forward, which also makes the counterweight 43 unable to move forward, as shown in Figure 10As shown, when the counterweight 43 is in the front position (a position corresponding to the core-out state), the clamping end 71 is clamped and positioned with the annular groove 431 of the counterweight 43, and since the pen clip 6 is in the rear position, it cannot continue to move rearward, which also makes the counterweight 43 unable to move rearward, thereby being able to keep the pen core 2 in the core-out or core-in position, and being unaffected by the posture of the pen, that is, being able to prohibit the pen core from automatically coming out or being retracted, regardless of whether the pen is vertically or horizontally placed, and especially being able to prevent the pen core 2 from automatically extending when the pen is carried, thereby protecting the pen core 2 and preventing the pen core 2 from soiling other items in the bag. In addition, the inclination angle of the pen when writing can be improved, and the pen core can be prevented from being automatically retracted.

[0037] The clamping piece 7 is a metal spring sheet arranged between the pen clip 6 and the pen barrel, one end of the metal spring sheet is the clamping end 71, the other end is the fixed end 72, the clamping end 71 and the fixed end 72 are bent to form the bending portion 73, the fixed end is fixed to the inner side of the pen clip 6, and the pen clip 6 and the pen barrel form a notch 8 for the bending portion 73 of the metal spring sheet to be inserted, the notch 8 is arranged at a position close to the side opening 131 of the pen barrel, the notch 8 includes a side wall adjacent to the opening 131, and the clamping end 71 is elastically pressed and fitted with the side wall. When the pen clip 6 moves forward and backward relative to the pen barrel, the metal spring sheet can also move forward and backward relative to the pen barrel, and since the clamping end 71 of the metal spring sheet is pressed and contacted with the side wall of the notch 8, it can move along the side wall with the movement of the pen clip 6, and when it moves to the opening 131, it is stretched into the inner side of the pen barrel under the action of its own elasticity, and can cooperate with the counterweight 43 (as shown in the state of Figure 9 、 10 ).

[0038] The notch 8 side wall is provided with a positioning protruding rib 81, and the clamping end 71 is provided with a positioning groove 711 matched with the positioning protruding rib 81. Through the cooperation of the positioning protruding rib 81 and the positioning groove 711, the positioning between the metal spring sheet and the pen barrel can be formed, and then when the pen clip 6 moves rearward to the end position, the positioning between the pen clip 6 and the pen barrel can be realized, and the pen clip 6 can be prevented from shaking.

[0039] The above embodiments are only preferred specific embodiments of the present application, and the usual changes and replacements made by those skilled in the art within the technical scheme of the present application are also included in the protection scope of the present application.

Claims

1. A gravity-driven pen, comprising a pen barrel, a pen refill disposed within the pen barrel, and a pen refill self-locking mechanism, the pen refill self-locking mechanism being supported at the rear end of the pen refill and capable of moving along the front-rear direction of the pen, and a first spring being disposed between the front end of the pen refill and the pen barrel, characterized in that: The pen refill self-locking mechanism includes a sleeve, a connecting rod, a counterweight, a slider, and a second spring. A window is provided on the side of the sleeve. The slider is laterally movable at the window of the sleeve. The front end of the connecting rod moves along the front-back direction through the inner side of the sleeve and is connected to the slider in a transmission manner. The rear end of the connecting rod is connected to the counterweight. The second spring acts between the sleeve and the connecting rod and drives the connecting rod to move backward relative to the sleeve. When the connecting rod moves forward and backward relative to the sleeve, it can drive the slider to move laterally outward and inward along the window of the sleeve, respectively. When the slider extends, it forms an abutment with the inner wall of the pen barrel. A limiting part is provided on the inner side of the pen barrel to cooperate with and limit the movement of the front end of the sleeve.

2. The gravity-driven pen according to claim 1, characterized in that: The slider includes a sleeve portion and an abutment portion. The abutment portion is located on one side of the sleeve portion. The sleeve portion and the connecting rod form a movable sleeve fit. An inclined guide groove is provided on the side of the sleeve portion. A convex shaft is provided on the connecting rod to form a guiding motion fit with the guide groove.

3. The gravity-driven pen according to claim 2, characterized in that: The sleeve portion has symmetrical guide grooves on both sides, which penetrate the inner and outer sides of the sleeve portion. The connecting rod has a connecting hole, and the convex shaft is composed of the two ends of a metal rod that is fixedly inserted into the connecting hole.

4. The gravity-driven pen according to claim 1, characterized in that: An annular baffle is provided on the inner side of the sleeve near the rear end. A movable cavity is formed between the rear end of the sleeve and the annular baffle. A connecting block is provided at the rear end of the connecting rod. The connecting block is movably disposed in the movable cavity. The connecting rod is connected and cooperates with the front end of the counterweight block through the connecting block. The second spring is sleeved on the connecting rod and abuts and cooperates with the annular baffle and the connecting block respectively.

5. The gravity-driven pen according to claim 4, characterized in that: The rear end of the connecting block is provided with a plug-in hole, and the front end of the counterweight block is provided with a plug-in block that is inserted and positioned in conjunction with the plug-in hole; the front end of the sleeve is provided with a positioning hole that is inserted and positioned in conjunction with the rear end of the pen refill.

6. The gravity-driven lead-out pen according to claim 1, characterized in that: The pen barrel includes a front section, a rear section, and a connecting section. The front end of the connecting section is screwed to the rear end of the inner hole of the front section, and the rear end of the connecting section is inserted and positioned at the front end of the inner hole of the rear section. The limiting part is formed by the rear end of the connecting section. The rear end side of the connecting section and the side wall of the inner hole of the rear section are circumferentially limited by a sliding groove and a protrusion arranged along the front-back direction of the pen. The rear end side of the connecting section and the side wall of the inner hole of the rear section are axially limited by two annular ribs arranged along the circumference of the pen.

7. The gravity-driven pen according to claim 1, characterized in that: The pen barrel is provided with a cylindrical counterweight at the front, which is located inside the pen barrel and sleeved on the outside of the pen refill.

8. The gravity-driven pen according to claim 1, characterized in that: The pen barrel has a pen clip at its rear end, which can move back and forth relative to the pen barrel. A snap-fit ​​device is movably connected between the pen clip and the pen barrel. The pen barrel has an opening on its side. When the pen clip moves relative to the pen barrel, it can drive the snap-fit ​​end of the snap-fit ​​device to extend into the inside of the pen barrel or retract it. The counterweight has a positioning part at its front and rear sides, which can engage with the snap-fit ​​end of the snap-fit ​​device when it extends into the inside of the pen barrel.

9. The gravity-driven pen according to claim 8, characterized in that: The snap-fit ​​component is a metal spring sheet disposed between the pen clip and the pen barrel. One end of the metal spring sheet is a snap-fit ​​end, and the other end is a fixed end. A bent portion is formed between the snap-fit ​​end and the fixed end. The fixed end is fixed to the inside of the pen clip. A notch is formed between the pen clip and the pen barrel, into which the bent portion of the metal spring sheet can be inserted. The notch is located close to the opening on the side of the pen barrel. The notch includes a side wall adjacent to the opening. The snap-fit ​​end and the side wall form an elastic pressing fit.

10. The gravity-driven pen according to claim 9, characterized in that: The recessed sidewall is provided with a positioning rib, and the snap-fit ​​end is provided with a positioning groove that cooperates with the positioning rib for positioning.

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