A type of air pen

Abstract

This invention discloses a pneumatic pen, belonging to the field of pen technology. The pneumatic pen includes: an outer rod, a front rod, a trigger device, and a refill. The refill is located inside the front rod. A refill retraction and reset component is sleeved and connected to the lower end of the refill. When the refill retraction and reset component is not tensioned, the refill is located inside the front rod. The outer wall of the front rod is sleeved inside the outer rod, and the front rod moves up and down relative to the outer rod. A limiting structure is provided between the front rod and the outer rod to prevent them from easily disengaging. The trigger device is installed at the top of the outer rod and forms a chamber through a sealing ring on the outer rod, achieving rapid and accurate refill extension and retraction control.

Description

Technical Field

[0001] This invention belongs to the field of pen technology, and more specifically, relates to a pneumatic pen. Background Technology

[0002] A pneumatic pen is a writing instrument that uses the principle of air pressure difference to control the extension and retraction of the writing instrument body. Traditional writing instruments, such as ballpoint pens or pencils, usually lack a simple, quick, and precise mechanism for controlling the extension and retraction of the writing instrument body. In situations where frequent switching between writing and carrying is required, such as students in the classroom or engineers working in the field, traditional pens are often inconvenient. Summary of the Invention

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

[0004] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides an air pen, comprising: an outer rod, a front rod, a triggering device, and a writing instrument body, wherein the writing instrument body is located inside the front rod, a core-resetting component is sleeved and connected to the lower end of the writing instrument body, the outer wall of the front rod is sleeved inside the outer rod, and the front rod can move up and down relative to the outer rod. A limiting structure is provided between the front rod and the outer rod to prevent them from easily separating; the upper end of the writing instrument body abuts against the limiting structure; the triggering device is located at the top of the outer rod, and when the front rod and the outer rod move towards each other, the triggering device and the front rod can form a sealed cavity by directly or indirectly contacting the outer rod to maintain the core-out state of the writing instrument body; When the airtight contact between the triggering device and the chamber disappears and the chamber is no longer sealed, the front rod will be subjected to the force of the core-resetting component to restore the core-resetting state of the writing instrument body.

[0005] As a further improvement of the present invention, a positioning element is installed on the top of the outer rod, and the triggering device is slidably installed on the positioning element.

[0006] As a further improvement of the present invention, the sealing and unsealing of the chamber is achieved in the following manner to reach the core-collecting state: Core-out state: The front rod moves upward relative to the outer rod, and the top of the front rod squeezes the gas in the chamber. The gas then pushes upward to the trigger device to exhaust the gas. After exhaust, the trigger device maintains the chamber's seal by spring-loaded reset, thus maintaining the core-out state. Core-retracting state: Direct contact controls the triggering device; during core retracting, pulling the triggering device forces the chamber to no longer seal, thus achieving the core-retracting state.

[0007] As a further improvement of the present invention, the sealing and unsealing of the chamber is achieved in the following two ways to achieve the core-collecting state: Core-out state: The front rod moves upward relative to the outer rod, and the top of the front rod squeezes the gas in the chamber. The gas then pushes upward to the trigger device to exhaust the gas. After exhaust, the trigger device maintains the chamber's seal by spring-loaded reset, thus maintaining the core-out state. The outer wall of the triggering device is fitted with a triggering ring; Core-retracting state one: The front rod moves upward relative to the outer rod, which increases the pressure inside the sealed chamber, forcing the triggering device to move upward and the chamber no longer seals. The triggering ring restricts the triggering device to slowly or stop resetting, thereby achieving the core-retracting state. Alternatively, in the second state of core recovery, the trigger ring, triggering device, and positioning component may have triggering core recovery slopes on any of their features; manual squeezing or gravity-induced triggering rings may guide the triggering device away from the outer rod through the triggering core recovery slopes, causing the chamber to become unsealed and lose its core-out retention force, thus recovering the core.

[0008] As a further improvement of the present invention, the triggering device includes: a positioning rod, wherein an upper protrusion is installed at the upper end of the positioning rod and a lower protrusion is installed at the lower end, the positioning rod passes through the middle of the positioning member and has a gap between it and the through hole wall of the positioning member to facilitate the passage of gas, or there is a gap between the positioning member and the outer rod to facilitate the passage of gas, wherein, when a sealed chamber is formed, the outer end of the lower protrusion is a sealing contact surface.

[0009] As a further improvement of the present invention, the lower end of the lower protrusion is fixedly connected to a sealing block as a sealing contact surface, and a sealing partition is fixedly connected to the inner wall of the outer rod, and a through hole corresponding to the sealing block is opened on the sealing partition.

[0010] As a further improvement of the present invention, the limiting structure includes a first guide rod fixedly connected to both sides of the lower end of the positioning member, a crossbar is provided between the pair of first guide rods, and the crossbar passes through the inner guide grooves provided on both sides of the front rod and is placed between the top of the writing tool body and the inner top wall of the front rod. The inner wall of the outer rod is provided with a first guide groove adapted to the first guide rod, and both ends of the crossbar are also positioned and connected in the first guide groove.

[0011] As a further improvement of the present invention, the limiting structure includes a limiting ring fixedly disposed on the bottom side wall of the front rod, the limiting ring being circumferentially fixedly provided with a plurality of second guide rods, the bottom side wall of the outer rod being provided with a second guide groove adapted to the second guide rods, and the inner wall of the outer rod being provided with a slide corresponding to the limiting ring; it also includes a crossbar, both ends of which are positioned and connected to the slide groove of the inner wall of the outer rod, and the crossbar passes through the inner guide grooves provided on both sides of the front rod.

[0012] As a further improvement of the present invention, the limiting structure includes a limiting member, a limiting notch is provided at the top of the front rod, a limiting boss is provided on the inner wall of the outer rod, the limiting member is located between the front rod and the outer rod, the limiting member is matched and placed in the limiting notch, and the top of the limiting member is restricted from rotation by the limiting boss.

[0013] As a further improvement of the present invention, the triggering device is a pen clip, which is connected to the outer rod through a reset device, so that the pen clip can be pulled up and down to trigger and release to reset. The top bottom circumference of the pen clip and the top of the outer rod abut against each other, and the top of the front rod and the bottom of the outer rod abut against each other, thereby forming a sealed chamber.

[0014] As a further improvement of the present invention, the reset device is a pen clip reset member or a hinge torsion spring.

[0015] As a further improvement of the present invention, there are an outer rod, a front rod, a triggering device, and a writing instrument body. The writing instrument body is located inside the front rod. A core-resetting component is sleeved and connected to the lower end of the writing instrument body. The outer wall of the front rod is sleeved inside the outer rod. The front rod moves up and down relative to the outer rod. A limiting structure is provided between the front rod and the outer rod to prevent them from easily separating; the upper end of the writing instrument body abuts against the triggering device to maintain a fixed state relative to the outer rod, and the lower end abuts against the front rod through the core retraction reset piece; The triggering device is installed at the top of the outer rod and extends through the top of the front rod; The outer rod is internally connected to a slidable positioning component. The positioning component is positioned with the outer rod by a limiting structure. The triggering device slides through the positioning component in a sealed manner. When the top of the front rod and the bottom of the positioning component contact the inner wall of the outer rod, a sealed chamber is formed.

[0016] As a further improvement of the present invention, a reset device is provided between the positioning member and the triggering device; As a further improvement of the present invention, the triggering device includes a positioning rod, with an upper protrusion installed at the upper end and a lower protrusion installed at the lower end, and the positioning rod passes through the top of the front rod; a pen clip is connected to the outer periphery of the upper protrusion, and the pen clip is located on the outside of the outer rod, and its top is fixedly installed with the outer rod.

[0017] As a further improvement of the present invention, the limiting structure includes a protrusion on the pen clip, the outer rod has an opening, the positioning member has an annular groove adapted to the protrusion, and the protrusion can pass through the opening.

[0018] As a further improvement of the present invention, the top of the front rod is separable from the main body, and inner guide grooves are provided on both side walls of the main body, with the top of the front rod slidably connected to the inner guide grooves.

[0019] As a further improvement of the present invention, the sealing of the chamber is formed by at least one sealing ring. The sealing ring is located inside the outer rod; when there is one sealing ring, the sealing of the chamber is formed inside the sealing ring; when there are two or more sealing rings, the sealing of the chamber is formed between the multiple sealing rings; and the uppermost side of the formed sealed chamber can match and seal with the lower end of the triggering device, and the lowermost side can match and seal with the top of the front rod.

[0020] As a further improvement of the present invention, when there is only one sealing ring, the inner wall cross-section of the sealing ring is inclined, and the inner diameter gradually decreases away from the front rod. The outer wall of the top of the front rod is also inclined.

[0021] As a further improvement of the present invention, the front rod is composed of a rod body and a core-changing component that are detachably connected.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: by the relative movement of the front rod and the outer rod and the configuration of the sealed chamber, the change of air pressure in the chamber can be effectively controlled. When the core is ejected, the chamber is sealed and the core ejection holding force is used to maintain the core ejection state; when the core is retracted, the chamber is no longer sealed, thereby losing the core ejection holding force to retract the core.

[0023] This application allows for several methods to switch between sealing and unsealing of the chamber. The first method involves directly contacting the control triggering device to release the chamber's seal, and then using a reset device to reset and control the chamber's seal. The second method involves setting up a trigger ring and a trigger core-receiving slope, with the trigger ring indirectly contacting the control triggering device to release the chamber's seal, and then using the reset device or the trigger ring's own weight to achieve sealing. The third method involves controlling the front rod to move upward relative to the outer rod, increasing the internal pressure of the chamber and forcing it to become unsealed. Attached Figure Description

[0024] Figure 1 This is a three-dimensional exploded view of Embodiment 1 of the present invention.

[0025] Figure 2 The images show the front view, cross-sectional view, and enlarged view of the core ejection state in Embodiment 1 of the present invention.

[0026] Figure 3 The images show the front view, cross-sectional view, and enlarged view of the core-collecting state in Embodiment 1 of the present invention.

[0027] Figure 4 This is a three-dimensional exploded view of Embodiment 2 of the present invention.

[0028] Figure 5 The images show the front view, cross-sectional view, and enlarged view of the core ejection state in Embodiment 2 of the present invention.

[0029] Figure 6 The images show the front view, cross-sectional view, and enlarged view of the core-collecting state in Embodiment 2 of the present invention.

[0030] Figure 7 This is a three-dimensional exploded view of Embodiment 3 of the present invention.

[0031] Figure 8 This is an exploded three-dimensional view of the limiting component in Embodiment 3 of the present invention.

[0032] Figure 9The images show the front view, cross-sectional view, and enlarged view of the core ejection state in Embodiment 3 of the present invention.

[0033] Figure 10 The images show the front view, cross-sectional view, and enlarged view of the core-collecting state in Embodiment 3 of the present invention.

[0034] Figure 11 This is a three-dimensional exploded view of Embodiment 4 of the present invention.

[0035] Figure 12 The images show the front view, cross-sectional view, and enlarged view of the core ejection state in Embodiment 4 of the present invention.

[0036] Figure 13 The images show the front view, cross-sectional view, and enlarged view of the core-collecting state in Embodiment 4 of the present invention.

[0037] Figure 14 This is a three-dimensional exploded view of Embodiment 5 of the present invention.

[0038] Figure 15 The images show the front view, cross-sectional view, and enlarged view of the core ejection state in Embodiment 5 of the present invention.

[0039] Figure 16 The images show the front view, cross-sectional view, and enlarged view of the core-collecting state in Embodiment 5 of the present invention.

[0040] Figure 17 This is a three-dimensional exploded view of Embodiment 6 of the present invention.

[0041] Figure 18 The images show the front view, cross-sectional view, and enlarged view of the core ejection state in Embodiment 6 of the present invention.

[0042] Figure 19 The images show the front view, cross-sectional view, and enlarged view of the core-collecting state in Embodiment 6 of the present invention.

[0043] Figure 20 These are the front view and cross-sectional view of the core-collecting state in Embodiment 7 of the present invention.

[0044] Figure 21 This is a front view and a cross-sectional view of the other side of the core-collecting state in Embodiment 7 of the present invention.

[0045] Figure 22 This is a front view and a cross-sectional view of the core-collecting state in Embodiment 8 of the present invention.

[0046] Figure 23 This is a front view and a cross-sectional view of the other side of the core-receiving state in Embodiment 8 of the present invention.

[0047] Figure 24 These are the front view and cross-sectional view of the core-receiving state in Embodiment 9 of the present invention.

[0048] Figure 25These are the front view and cross-sectional view of the core-receiving state in Embodiment 10 of the present invention.

[0049] Figure 26 This is a partial enlarged view of Embodiment 10 of the present invention.

[0050] Explanation of the labels in the diagram: 1 Outer rod, 1.1 Limiting boss, 2 Front rod, 2.1 Inner guide groove, 2.2 Limiting notch, 2.3 Limiting component, 3 Writing instrument body, 4 Core return reset component, 5 Triggering device, 5.1 Positioning rod, 5.2 Lower protrusion, 5.21 Sealing block, 5.3 Upper protrusion, 5.4 Trigger core return slope, 6 Triggering ring, 7 Reset device, 8 Positioning component, 9 Guide rod, 10 Sealing ring, 11 Chamber, 12 Limiting ring, 13 Second guide rod, 14 Second guide groove, 15 Pen clip, 151 Pen clip reset component, 16 Protective sleeve, 161 Triggering boss, 19 Opening, 20 Protrusion, 21 Ring groove, 22 One-way boss, 23 Buffer limiting boss, 24 Buffer spring. Detailed Implementation Specific Implementation Example 1 like Figures 1-3 A pneumatic pen includes: an outer rod 1, a front rod 2, a triggering device 5, and a writing instrument body 3. The writing instrument body 3 is located inside the front rod 2. A core-resetting component 4 is sleeved and connected to the lower end of the writing instrument body 3. When the core-resetting component 4 is not tensioned, the head of the writing instrument body 3 is located inside the front rod 2. The outer wall of the front rod 2 is sleeved inside the outer rod 1. The front rod 2 moves up and down relative to the outer rod 1. A sealing ring 10 is provided inside the outer rod 1, and the sealing ring 10 is located above the front rod 2. The triggering device 5 is installed at the top of the outer rod 1 and forms a chamber 11 through the sealing ring 10 inside the outer rod 1. The core-resetting component 4 can be a reset spring.

[0052] Specifically, the triggering device 5 includes: a positioning rod 5.1, a lower protrusion 5.2 connected to the lower surface of the positioning rod 5.1, and an upper protrusion 5.3 fixedly connected to the upper end of the positioning rod 5.1. When a sealed chamber 11 is formed, the bottom end of the lower protrusion 5.2 contacts the sealing ring 10.

[0053] Specifically, a reset device 7 is sleeved on the outer wall of the positioning rod 5.1, and the reset device 7 can be a spring.

[0054] Specifically, the inner wall section of the sealing ring 10 is inclined, and the outer wall of the top of the front rod 2 is also inclined to match the inner wall of the sealing ring 10, so as to ensure the sealing of the cavity 11 formed by the front rod 2 and the sealing ring 10.

[0055] Specifically, a trigger ring 6 is sleeved on the outer wall of the positioning rod 5.1, and the trigger ring 6 is used to limit the triggering device 5 from slowly or stopping its reset.

[0056] When the core needs to be retracted, the front lever 2 moves upward, reducing the area inside the chamber 11, thereby increasing the pressure inside the chamber 11, opening the trigger device 5, and through the trigger ring 6, restricting the trigger device 5 to slowly or stop resetting, so that the chamber 11 is no longer sealed, and then through the core retraction reset component 4 (spring), the output end of the writing instrument body 3 springs back into the front lever 2, thereby achieving the core retraction state.

[0057] Specifically, a positioning element 8 is fixedly installed at the top of the outer rod 1. A reset device 7 is located between the inner wall of the positioning element 8 and the lower protrusion 5.2. First guide rods 9 are fixed on both sides of the lower end of the positioning element 8. The inner wall of the outer rod 1 is provided with a first guide groove that matches the first guide rod 9. Under the action of the first guide rod 9 and the first guide groove, the front rod 2 moves linearly up and down on the inner wall of the outer rod 1, improving the stability of the linear movement of the front rod 2 and preventing rotation during movement. The positioning rod 5.1 penetrates the top of the positioning element 8 and has a gap between it and the through hole wall of the positioning element 8 to facilitate gas passage. There is also a gap between the lower protrusion 5.2 and the positioning element 8. A crossbar is provided between the pair of first guide rods 9. Both ends of the rod are also positioned and connected in the first guide groove, and the crossbar passes through the inner guide grooves 2.1 set on both sides of the front rod 2 and is placed between the top of the writing instrument body 3 and the inner top wall of the front rod 2. The pair of first guide rods 9 and the crossbar work together to form a limiting structure for the outer rod 1 to disengage from the front rod 2 / to rotate relative to it. At the same time, a step is formed between the positioning part 8 and the inner wall of the outer rod 1 to prevent the sealing ring 10 from moving too high. The top of the positioning part 8 and the lower end of the upper protrusion 5.3 are provided with a trigger core-retracting slope 5.4. The upper and lower ends of the trigger ring 6 are both concave structures that match the design of the trigger core-retracting slope 5.4, so that the gravity of the trigger ring 6 can be concentrated on the center of the outer rod 1, so that the pen can be guided and retracted by the trigger core-retracting slope 5.4.

[0058] To facilitate the replacement of the writing instrument body 3, the front rod 2 is composed of a rod body 2a and a core replacement part 2b that are detachably connected. The detachable connection can be a threaded connection.

[0059] During use, when writing is required, the front rod 2 is pulled upwards, causing its top end to contact the sealing ring 10. This causes the gas in the chamber 11 to move upwards and push open the lower protrusion 5.2, which in turn causes the positioning rod 5.1 to move upwards. The gas is then discharged from the gap. After this is completed, the triggering device 5 moves downwards quickly through the reset device 7 to contact the sealing ring 10. This causes the bottom end of the lower protrusion 5.2 to contact the sealing ring 10, forming a sealed chamber 11. Due to the influence of the core return reset component 4 (the spring on the writing instrument body 3), the front rod 2 always has a downward reset force. Because of the sealed chamber 11, the force forming the sealed chamber 11 will offset the reset force of the core return reset component 4, thus keeping the output end of the writing instrument body 3 exposed outside the front rod 2. When it is necessary to collect the core, the following three methods can be used: 1. Moving the front lever 2 upwards reduces the internal area of ​​the chamber 11, thereby increasing the pressure and opening the trigger device 5, causing the chamber 11 to become unsealed. Then, the output end of the writing instrument body 3 springs back into the front lever 2 via the retractable core reset component 4, thus achieving the retractable core state. When the pen is placed horizontally with the core retracted, the trigger ring 6, due to the guiding effect of the inclined surface, presses the upper protrusion 5.3 away from the outer lever 1, making the chamber 11 less likely to seal and facilitating core retraction.

[0060] 2. Manual squeezing or gravity-induced triggering ring 6 guides triggering device 5 away from outer rod 1 via triggering core-collecting slope 5.4, causing chamber 11 to become unsealed and lose core-collecting force, thus collecting the core. 3. Pull the front rod 2 away from the outer rod 1, so that the sealing ring 10 at the top of the front rod 2 leaves the limiting boss 1.1 on the inner wall of the outer rod 1, releasing the sealing state of the chamber 11. At the same time, the core retraction reset component 4 makes the front rod 2 leave the chamber 11, achieving the core retraction state. Specific Implementation Example 2

[0062] like Figure 4-6 The illustrated air pen includes: an outer rod 1, a front rod 2, a triggering device 5, and a writing instrument body 3. The writing instrument body 3 is located inside the front rod 2. A core-resetting component 4 is sleeved and connected to the lower end of the writing instrument body 3. When the core-resetting component 4 is not tensioned, the pen tip of the writing instrument body 3 is located inside the front rod 2. The outer wall of the front rod 2 is sleeved inside the outer rod 1, and the front rod 2 moves up and down relative to the outer rod 1. The outer rod 1 is provided with a sealing ring 10 inside, and a limiting boss 1.1 corresponding to the sealing ring 10 is provided to prevent the sealing ring 10 from moving downward. The sealing ring 10 is located above the front rod 2. The top of the front rod 2 is also fitted with a sealing ring 10, and a chamber 11 is formed by the two sealing rings 10. The triggering device 5 is installed at the top of the outer rod 1, and the core resetting component 4 can be a reset spring.

[0063] Specifically, the triggering device 5 includes: a positioning rod 5.1, with an upper protrusion 5.3 threadedly connected to the upper end of the positioning rod 5.1, and a lower protrusion 5.2 fixedly connected to the lower end of the positioning rod 5.1. When a sealed chamber 11 is formed, the outer end of the lower protrusion 5.2 contacts the upper sealing ring 10.

[0064] Specifically, a reset device 7 is sleeved on the outer wall of the positioning rod 5.1, and the reset device 7 can be a spring.

[0065] Specifically, a trigger ring 6 is sleeved on the outer wall of the positioning rod 5.1, and the trigger ring 6 is used to limit the triggering device 5 from slowly or stopping its reset.

[0066] Specifically, a limiting ring 12 is fixedly provided on the bottom side wall of the front rod 2, and a plurality of second guide rods 13 are fixedly provided on the limiting ring 12 in the circumferential direction. The bottom side wall of the outer rod 1 is provided with a second guide groove 14 that is adapted to the second guide rods 13. Under the action of the second guide rods 13 and the second guide groove 14, the stability of the front rod 2 moving up and down in a straight line is further improved, and the rotation of the front rod 2 is restricted when it moves. The inner wall of the outer rod 1 is provided with a slide corresponding to the limiting ring 12 to prevent the front rod 2 from disengaging from the outer rod 1.

[0067] Specifically, the top of the outer rod 1 is threadedly connected to a positioning element 8, and the positioning rod 5.1 passes through the top of the positioning element 8 and has a gap between it and the through hole wall of the positioning element 8 to facilitate gas passage. The lower protrusion 5.2 also has a gap with the inner wall of the outer rod 1. The reset device 7 is located between the positioning element 8 and the lower protrusion 5.2. A crossbar is provided between the top of the writing instrument body 3 and the inner top wall of the front rod 2. Both ends of the crossbar are positioned and connected to the sliding groove of the inner wall of the outer rod 1, and the crossbar passes through the inner guide groove 2.1 provided on both sides of the front rod 2. The limiting ring 12, the second guide rod 13, the second guide groove 14, and the crossbar work together to form a limiting structure to prevent the outer rod 1 from separating from the front rod 2 / relatively rotating. The top of the positioning element 8 and the lower end of the upper protrusion 5.3 are provided with a trigger core-retracting slope 5.4. The upper and lower ends of the trigger ring 6 are both concave structures that match the trigger core-retracting slope 5.4, so that the gravity of the trigger ring 6 can be concentrated on the center of the outer rod 1, so that the pen can be guided and retracted by the trigger core-retracting slope 5.4.

[0068] To facilitate the replacement of the writing instrument body 3, the front rod 2 is composed of a rod body 2a and a core replacement part 2b that are detachably connected. The detachable connection can be a threaded connection.

[0069] When the lead needs to be ejected, the front lever 2 is pulled upward, causing the gas in the chamber 11 to move upward and push open the trigger device 5 (the trigger device 5 moves upward), allowing the gas in the chamber 11 to be discharged. After the gas is discharged, the trigger device 5 moves downward through the reset device 7 (spring) to contact the sealing ring 10, forming a sealed chamber 11. Due to the influence of the lead return reset component 4 (spring on the writing instrument body 3), the front lever 2 always has a downward reset force. Furthermore, the force forming the sealed chamber 11 will counteract the reset force of the lead return reset component 4, thus keeping the output end of the writing instrument body 3 exposed outside the front lever 2.

[0070] When it is necessary to collect the core, the following three methods can be used: 1. Moving the front lever 2 upwards reduces the internal area of ​​the chamber 11, thereby increasing the pressure and opening the trigger device 5, causing the chamber 11 to become unsealed. Then, the output end of the writing instrument body 3 springs back into the front lever 2 via the retractable core reset component 4, thus achieving the retractable core state. When the pen is placed horizontally with the core retracted, the trigger ring 6, due to the guiding effect of the inclined surface, presses the upper protrusion 5.3 away from the outer lever 1, making the chamber 11 less likely to seal and facilitating core retraction.

[0071] 2. Manual squeezing or gravity-induced triggering ring 6 guides triggering device 5 away from outer rod 1 via triggering core-collecting slope 5.4, causing chamber 11 to become unsealed and lose core-collecting force, thus collecting the core. 3. Pull the front rod 2 away from the outer rod 1, so that the sealing ring 10 at the top of the front rod 2 leaves the limiting boss 1.1 on the inner wall of the outer rod 1, releasing the sealing state of the chamber 11. At the same time, the core retraction reset component 4 makes the front rod 2 leave the chamber 11, achieving the core retraction state. Specific Implementation Example 3

[0072] like Figure 7-10 The illustrated air pen includes: an outer rod 1, a front rod 2, a triggering device 5, and a writing instrument body 3. The writing instrument body 3 is located inside the front rod 2. A core-resetting component 4 is sleeved and connected to the lower end of the writing instrument body 3. When the core-resetting component 4 is not tensioned, the head of the writing instrument body 3 is located inside the front rod 2. The outer wall of the front rod 2 is sleeved inside the outer rod 1, and the front rod 2 moves up and down relative to the outer rod 1. The outer rod 1 is provided with a sealing ring 10 inside, and a limiting boss 1.1 corresponding to the sealing ring 10 is provided on the upper edge to prevent the sealing ring 10 from moving down. The sealing ring 10 is located above the front rod 2. The top of the front rod 2 is also fitted with a sealing ring 10. A chamber 11 is formed by the two sealing rings 10. The triggering device 5 is installed on the inner side of the outer rod 1. The core resetting component 4 can be a reset spring.

[0073] Specifically, the triggering device 5 includes: a positioning rod 5.1, which is threadedly connected to an upper protrusion 5.3, and a lower protrusion 5.2 is fixedly connected to the lower end of the positioning rod 5.1. When a sealed chamber 11 is formed, the bottom end of the lower protrusion 5.2 contacts the sealing ring 10.

[0074] Specifically, a reset device 7 is sleeved on the outer wall of the positioning rod 5.1, and the reset device 7 can be a spring.

[0075] Specifically, a trigger ring 6 is sleeved on the outer wall of the positioning rod 5.1, and the trigger ring 6 is used to limit the triggering device 5 from slowly or stopping its reset.

[0076] Specifically, the top sidewall of the front rod 2 is provided with two limiting notches 2.2, and a limiting member 2.3 is provided between the front rod 2 and the outer rod 1. The inner wall of the outer rod 1 is provided with the lower edge of the limiting boss 1.1 corresponding to the limiting member 2.3. The limiting member 2.3 is matched and placed in the limiting notch 2.2, and the top of the limiting member 2.3 is limited by the lower edge of the limiting boss 1.1. The limiting notch 2.2, the limiting boss 1.1 and the limiting member 2.3 work together to form a limiting structure that restricts the front rod 2 from disengaging from the outer rod 1 / relative rotation, further improving the stability of the front rod 2's linear up and down movement. The upper end of the writing instrument body 3 abuts against the bottom end of the limiting member 2.3.

[0077] Specifically, the inner side of the outer rod 1 is threaded with a positioning element 8, the positioning rod 5.1 passes through the top of the positioning element 8, and there is a gap between it and the through hole wall of the positioning element 8 to facilitate the passage of gas. There is also a gap between the lower protrusion 5.2 and the inner wall of the outer rod 1. The reset device 7 is located between the positioning element 8 and the lower protrusion 5.2. The top of the positioning element 8 and the lower end of the upper protrusion 5.3 are provided with a trigger core-retracting slope 5.4. The upper and lower ends of the trigger ring 6 are both concave structures that match the design of the trigger core-retracting slope 5.4, so that the gravity of the trigger ring 6 can be concentrated on the center of the outer rod 1, so that the pen can be guided and retracted by the trigger core-retracting slope 5.4.

[0078] To facilitate the replacement of the writing instrument body 3, the front rod 2 is composed of a rod body 2a and a core replacement part 2b that are detachably connected. The detachable connection can be a threaded connection.

[0079] When the lead needs to be ejected, the front lever 2 is pulled upward, causing the gas in chamber 11 to move upward and push open the trigger device 5 (the trigger device 5 moves upward), allowing the gas in chamber 11 to be discharged. After discharge, the trigger device 5 moves downward through the reset device 7 (spring) to contact the upper sealing ring 10, forming a sealed chamber 11. Due to the influence of the lead return reset component 4 (spring on the writing instrument body 3), the front lever 2 always has a downward reset force. Furthermore, the force forming the sealed chamber 11 will counteract the reset force of the lead return reset component 4, thus keeping the output end of the writing instrument body 3 exposed outside the front lever 2.

[0080] When the pen needs to be retracted, the front lever 2 moves upward, reducing the internal area and increasing the pressure, which opens the trigger device 5, causing the chamber 11 to no longer be sealed. Then, the retracting reset component 4 (spring) causes the output end of the writing instrument body 3 to spring back into the front lever 2, thus achieving the retracted state. When the pen is placed horizontally with the retracted pen in place, the trigger ring 6, due to the inclined guide effect, squeezes the upper protrusion 5.3 away from the positioning component 8, making the chamber 11 less likely to be sealed, facilitating retracting. Alternatively, the front lever 2 can be pulled away from the outer lever 1, causing the sealing ring 10 at the top of the front lever 2 to leave the limiting protrusion 1.1 on the inner wall of the outer lever 1, releasing the sealing state of the chamber 11. At the same time, the retracting reset component 4 causes the front lever 2 to leave the chamber 11, achieving the retracted state. Specific Implementation Example 4

[0081] like Figure 11-13 The air pen shown differs from Embodiment 3 in that the sealing ring 10 on the upper side inside the outer rod 1 can be replaced by a sealing block 5.21. The sealing block 5.21 is fixedly connected to the lower end of the lower protrusion 5.2. A sealing partition is fixedly connected to the inner wall of the outer rod 1. The sealing partition is located above the sealing ring 10 at the top of the front rod 2. The sealing partition has a through hole corresponding to the sealing block 5.21. The chamber 11 is formed by the sealing block 5.21 sealing the through hole and then connecting with the sealing ring 10 at the top of the front rod 2. In a further embodiment, a pen clip 15 is also fixedly connected to the outer periphery of the top of the outer rod 1 for convenient pen placement. When the core needs to be ejected, the front rod 2 is pulled upward, causing the gas in chamber 11 to move upward and push open the sealing block 5.21, allowing the gas in chamber 11 to be discharged. After the gas is discharged, the resetting device 7 (spring) causes the sealing block 5.21 to move downward and contact the through hole of the sealing partition, forming a sealed chamber 11. Due to the influence of the core return reset component 4 (spring on the writing instrument body 3), the front rod 2 always has a downward resetting force. Furthermore, the force forming the sealed chamber 11 will counteract the resetting force of the core return reset component 4, thus keeping the output end of the writing instrument body 3 exposed outside the front rod 2.

[0082] When the pen needs to be retracted, the front rod 2 moves upward, reducing the internal area and increasing the pressure, thus opening the trigger device 5. This means the sealing block 5.21 no longer seals the through hole, making the chamber 11 unsealed. The retracting reset component 4 (spring) then causes the output end of the writing instrument body 3 to spring back into the front rod 2, achieving the retracted state. When the pen is placed horizontally with the retracted pen in place, the trigger ring 6, due to the inclined guide effect, presses the upper protrusion 5.3 away from the positioning component 8, making the chamber 11 less likely to seal, facilitating retracting. Alternatively, pulling the front rod 2 away from the outer rod 1 causes the sealing ring 10 at the top of the front rod 2 to leave the limiting protrusion 1.1 on the inner wall of the outer rod 1, releasing the seal of the chamber 11. Simultaneously, the retracting reset component 4 causes the front rod 2 to leave the chamber 11, achieving the retracted state. Specific Implementation Example 5

[0083] like Figure 14-16 The pneumatic pen includes: an outer rod 1, a front rod 2, a triggering device 5, and a writing instrument body 3. The writing instrument body 3 is located inside the front rod 2. A core-resetting component 4 is sleeved and connected to the lower end of the writing instrument body 3. When the core-resetting component 4 is not tensioned, the head of the writing instrument body 3 is located inside the front rod 2. The outer wall of the front rod 2 is sleeved inside the outer rod 1. The front rod 2 moves up and down relative to the outer rod 1. A sealing ring 10 is provided at the top of the front rod 2. The triggering device 5 is installed at the top of the outer rod 1. The core-resetting component 4 can be a reset spring.

[0084] Specifically, the triggering device 5 includes: a positioning rod 5.1, an upper protrusion 5.3 fixedly connected to the upper end of the positioning rod 5.1, a lower protrusion 5.2 fixedly connected to the lower end of the positioning rod 5.1, and a pen clip 15 threadedly connected to the outer periphery of the upper protrusion 5.3, with the pen clip 15 located on the outer side and fixedly connected to the top of the outer rod 1. The outer wall of the positioning rod 5.1 is fitted with a reset device 7, which can be a spring.

[0085] Specifically, the pen clip 15 has a protrusion 20, the outer wall of the outer rod 1 has an opening 19, and a positioning member 8 is slidably disposed inside the outer rod 1. The positioning member 8 has an annular groove 21 on its outer periphery that matches the protrusion 20. The protrusion 20 can pass through the opening 19 and engage with the annular groove 21 to restrict the movement of the positioning member 8. A positioning rod 5.1 passes through the positioning member 8 and slides in a sealed manner between the through holes of the positioning member 8. A sealing ring 10 is also provided at the bottom of the positioning member 8, and two sealing rings 10 form a chamber 11. A reset device 7 is located between the positioning member 8 and the upper protrusion 5.3.

[0086] Specifically, the inner wall of the outer rod 1 has a limiting boss 1.1 between the two sealing rings 10 to control the closest distance between the two sealing rings 10.

[0087] Specifically, the top of the front lever 2 is separable from the main body. The positioning rod 5.1 passes through the top of the front lever 2. The lower protrusion 5.2 is located inside the main body between the main body 3 and the top of the front lever 2. The two side walls of the main body are provided with inner guide grooves 2.1. The top of the front lever 2 can slide in the inner guide grooves 2.1. The inner guide grooves 2.1 restrict the detachable top of the front lever 2 to move vertically without relative rotation. Alternatively, the guide grooves 2.1 can be omitted, and only a slot for locking the top is provided in the main body of the front lever 2.

[0088] When the core needs to be ejected, the front lever 2 is pulled upwards, and the sealing ring 10 at the top of the front lever 2 abuts against the limiting boss 1.1 of the outer lever 1. At the same time, the gas in the chamber 11 moves upwards together, pushing open the positioning member 8 so that the gas in the chamber 11 can be discharged from the opening 19. After discharge, the sealing ring 10 on the positioning member 8 contacts the limiting boss 1.1 again through the reset device 7 (spring), forming a sealed chamber 11. At the same time, the protrusion 20 restricts the movement of the positioning member 8. Due to the influence of the core return reset member 4 (the reset spring on the writing instrument body 3), the front lever 2 always has a downward reset force. The force forming the sealed chamber 11 will offset the reset force of the core return reset member 4, thus keeping the output end of the writing instrument body 3 exposed outside the front lever 2.

[0089] When the core needs to be retracted, pressing the pen clip 15 causes the protrusion 20 to push into the annular groove 21, giving the positioning member 8 a slight axial displacement. This breaks the seal of the bottom sealing ring 10 of the positioning member 8, releasing the sealing state of the chamber 11. At the same time, the core retraction reset member 4 causes the front rod 2 to leave the chamber 11, achieving the core retraction state. Alternatively, pulling the front rod 2 away from the outer rod 1 causes the sealing ring 10 at the top of the front rod 2 to leave the limiting boss 1.1 on the inner wall of the outer rod 1, releasing the sealing state of the chamber 11. At the same time, the core retraction reset member 4 causes the front rod 2 to leave the chamber 11, achieving the core retraction state. Specific Implementation Example Six

[0090] like Figure 17-19 The air pen described herein differs from Embodiment 3 in that, for ease of assembly, reducing the number of assembly parts, and simplifying the structure, the air pen includes: an outer rod 1, a front rod 2, a triggering device 5, and a writing instrument body 3. The writing instrument body 3 is located inside the front rod 2, and a core-resetting component 4 is sleeved and connected to the lower end of the writing instrument body 3. When the core-resetting component 4 is not tensioned, the head of the writing instrument body 3 is located inside the front rod 2, and the outer wall of the front rod 2 is sleeved inside the outer rod 1. The front rod 2 moves up and down relative to the outer rod 1. The core-resetting component 4 can be a reset spring.

[0091] The triggering device 5 consists of only a pen clip 15, which is connected to the outer rod 1 via a hinge and a torsion spring. The torsion spring is a reset device 7, which allows the pen clip 15 to be pulled up and down to trigger the action. A sealing ring 10 is provided between the top and bottom circumference of the pen clip 15 and the top of the outer rod 1. A sealing ring 10 is also provided at the top of the front rod 2. The two sealing rings 10 form a chamber 11.

[0092] Specifically, a limiting notch 2.2 is provided on the top side wall of the front rod 2, a limiting boss 1.1 is provided on the inner wall of the outer rod 1, and a limiting member 2.3 is provided between the front rod 2 and the outer rod 1. The limiting member 2.3 is matched and placed in the limiting notch 2.2, and the top of the limiting member 2.3 is restricted by the limiting boss 1.1. The limiting notch 2.2, the limiting boss 1.1 and the limiting member 2.3 work together to form a limiting structure that restricts the front rod 2 from separating from the outer rod 1 / relative rotation, further improving the stability of the front rod 2's linear up and down movement. The upper end of the writing instrument body 3 abuts against the bottom end of the limiting member 2.3.

[0093] When the lead needs to be ejected, the front lever 2 is pulled upwards, causing the gas in chamber 11 to move upwards as well, pushing open the pen clip 15 and allowing the gas in chamber 11 to be expelled. After the gas is expelled, the torsion spring forces the sealing ring 10 of the pen clip 15 to contact the top of the outer lever 1, forming a sealed chamber 11. Due to the influence of the lead return reset component 4 (the return spring on the writing instrument body 33), the front lever 2 always has a downward reset force. The force forming the sealed chamber 1111 counteracts the reset force of the lead return reset component 4, achieving a fixing effect.

[0094] When it is necessary to retract the pen core, the pen clip 15 is pulled to make the sealing ring 10 of the pen clip 15 leave the chamber 11, thus releasing the seal. At the same time, the retracting reset component 4 makes the front rod 2 leave the chamber 11, thus achieving the retracting state. Specific Implementation Example 7

[0095] like Figure 20-21 Unlike the second specific embodiment, the reset device 7 is absent. After the gas in the lead-out chamber 11 is completely expelled when the front rod 2 is pulled upward, gravity acts as the lead-out holding force, causing the trigger device 5 to move downward and contact the upper sealing ring 10, forming a sealed chamber 11. When the lead is retracted, the front rod 2 moves upward, reducing the internal area and increasing the pressure, pushing open the trigger device 5 to overcome gravity, so that the chamber 11 is no longer sealed. Then, the lead-retracting reset component 4 (spring) causes the output end of the writing instrument body 3 to spring back into the front rod 2, thus achieving the lead-retracting state. At this time, the lead retraction is complete, and gravity is no longer likely to affect the lead retraction. When the pen is placed horizontally after lead retraction, the trigger ring 6, due to the inclined guide effect, squeezes the upper protrusion 5.3 away from the positioning component 8, making the chamber 11 less likely to seal and facilitating lead retraction. Specific Implementation Example 8

[0096] like Figure 22-23 Unlike specific embodiment six, a pen clip reset component 151 is added. The pen clip reset component 151 is fixedly connected to the lower part of the pen clip 15 and is used as a reset device 7 instead of a torsion spring. After the gas in the chamber 11 is completely discharged, the elastic force of the pen clip reset component 151 causes the sealing ring 10 of the pen clip 15 to contact the top of the outer rod 1, forming a sealed chamber 11. Specific Implementation Example Nine

[0097] like Figure 24 Unlike the first specific embodiment, in order to protect the structure and to provide a buffer protection for the way the front rod 2 is pulled to retract the core, the front rod 2 is also provided with a one-way boss 22.

[0098] A protective sleeve 16 and a buffer spring 20 are added. The protective sleeve 16 is provided with a trigger boss 161. The protective sleeve 16 is sleeved on the front rod 2. The buffer spring 20 is located inside the protective sleeve 16. When the protective sleeve 16 is forcibly moved towards the writing end, the trigger boss 161 squeezes the buffer spring 20, causing the resistance of the buffer spring 20 to the protective sleeve 16 to change from small to large, thereby playing a role in buffering, reminding and warning. Specific Implementation Example 10

[0099] like Figure 25-26 Unlike the first specific embodiment, in order to protect the structure and to provide a buffer protection for the way the front rod 2 is pulled to retract the core, the front rod 2 is also provided with a one-way boss 22 and a buffer limiting boss 23.

[0100] A protective sleeve 16 is also added; the protective sleeve 16 is provided with a trigger protrusion 161. The protective sleeve 16 is sleeved on the front rod 2. By fitting the protective sleeve 16 on the front rod 2, the movement of the protective sleeve 16 is restricted by the trigger protrusion 161 under the action of the one-way protrusion 22 and the buffer limiting protrusion 23. When the protective sleeve 16 is forcibly moved towards the writing end, the trigger protrusion 161 will pass the buffer limiting protrusion 23. In this way, the change of resistance from large to small plays a buffering and reminder role.

[0101] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pneumatic pen, comprising: Outer rod (1); The front rod (2) is axially movable and fitted inside the outer rod (1); The main body of the writing instrument (3) is located inside the front rod (2); The core retraction reset component (4) is used to apply a retraction force to the writing instrument body (3) to retract the core; A triggering device (5) is provided on the outer rod (1); Its features are: During the process of the front rod (2) being driven by an external force from the core-collecting state to the core-exiting position relative to the outer rod (1), the front rod (2) squeezes the gas in the chamber, and the gas pushes open the trigger device (5) to be discharged. When the front rod (2) moves to the core-out position, the triggering device (5) resets. The lower end of the triggering device (5), the top end of the front rod (2), and the inner wall of the outer rod (1) together form a sealed chamber (11). The air pressure in the sealed chamber (11) directly resists the reset force of the core-retracting reset component (4) to keep the writing instrument body (3) in the core-out state. The triggering device (5) can be operatively moved to break the seal of the sealed chamber (11), thereby causing the resetting force of the core resetting member (4) to drive the writing instrument body (3) back to the core resetting state.

2. A pneumatic pen, comprising: Outer rod (1); The front rod (2) is axially movable and fitted inside the outer rod (1); The main body of the writing instrument (3) is located inside the front rod (2); The core retraction reset component (4) is used to apply a retraction force to the writing instrument body (3) to retract the core; A triggering device (5) is provided at the top and / or side of the outer rod (1); Its features are: During the process of the front rod (2) and the outer rod (1) moving towards each other to the core-out position, the front rod (2) squeezes the gas in the chamber, and the gas pushes open the trigger device (5) to be discharged; When the front rod (2) moves to the core-out position, the triggering device (5) resets. The lower end of the triggering device (5) and the top end of the front rod (2) form a sealed chamber (11) by directly or indirectly contacting the inner wall of the outer rod (1). The air pressure in the sealed chamber (11) directly resists the reset force of the core-retracting reset component (4) to keep the writing instrument body (3) in the core-out state. When the airtight contact between the triggering device (5) and the sealed chamber (11) is broken and the sealed chamber (11) is no longer sealed, the resetting force of the core resetting component (4) drives the writing instrument body (3) to return to the core resetting state.

3. A pneumatic pen, comprising: Outer rod (1); The front rod (2) is axially movable and fitted inside the outer rod (1); The main body of the writing instrument (3) is located inside the front rod (2); The core retraction reset component (4) is used to apply a retraction force to the writing instrument body (3) to retract the core; A triggering device (5) is installed at the top of the outer rod (1) and extends through the top of the front rod (2); The positioning component (8) is slidably connected to the inside of the outer rod (1) and positioned with the outer rod (1) through a limiting structure. The triggering device (5) slides through the positioning component (8) in a sealed manner. Its features are: During the process of the front rod (2) moving towards the core position, the front rod (2) squeezes the gas in the chamber, and the gas pushes open the trigger device (5) to be discharged. When the top of the front rod (2) and the bottom of the positioning member (8) come into contact with the inner wall of the outer rod (1), the triggering device (5) resets. The lower end of the triggering device (5), the top end of the front rod (2), the positioning member (8) and the inner wall of the outer rod (1) together form a sealed chamber (11). The air pressure in the sealed chamber (11) directly resists the reset force of the core resetting member (4) to keep the writing instrument body (3) in the core-out state. The triggering device (5) can be operatively moved to break the seal of the sealed chamber (11), thereby causing the resetting force of the core resetting member (4) to drive the writing instrument body (3) back to the core resetting state.

4. A pneumatic pen according to claim 1 or 2, characterized in that: The top of the outer rod (1) is equipped with a positioning element (8), and the triggering device (5) is slidably installed on the positioning element (8).

5. A pneumatic pen according to claim 1, 2, or 3, characterized in that: The sealing and unsealing of the sealed chamber (11) is achieved in the following way: Core-out state: The front rod (2) moves upward relative to the outer rod (1), and the top of the front rod (2) squeezes out the gas in the sealed chamber (11). The gas then pushes the trigger device (5) to exhaust the gas. After exhausting the gas, the trigger device (5) maintains the sealing of the sealed chamber (11) by spring force reset, thereby maintaining the core-out state. Core-retracting state: When retracting the core, the trigger device (5) is pulled up to force the sealed chamber (11) to no longer be sealed, thus achieving the core-retracting state.

6. A pneumatic pen according to claim 4, characterized in that: The triggering device (5) is fitted with a triggering ring (6) on its outer wall. The sealing and unsealing of the sealed chamber (11) are achieved in the following ways to reach the core-collecting state: Core-out state: The front rod (2) moves upward relative to the outer rod (1), and the top of the front rod (2) squeezes out the gas in the sealed chamber (11). The gas then pushes the trigger device (5) to exhaust the gas. After exhaust, the trigger device (5) maintains the sealing of the sealed chamber (11) by spring force reset or by the weight of the trigger ring (6) itself, thereby maintaining the core-out state. Core-collecting state 1: The front rod (2) moves upward relative to the outer rod (1), which increases the pressure inside the sealed chamber (11) and forces the triggering device (5) to move upward so that the sealed chamber (11) is no longer sealed. The triggering ring (6) limits the reset speed of the triggering device (5) and delays its reset seal, thereby achieving the core-collecting state. Alternatively, in the second state of core recovery: at least one of the trigger ring (6), the trigger device (5), and the positioning member (8) is provided with a trigger core recovery slope (5.4); the trigger ring is manually squeezed, or the trigger ring, under its own gravity, is guided by the trigger core recovery slope (5.4) to move the trigger device (5) away from the outer rod (1), so that the sealed chamber (11) is not sealed and loses the core retention force, thereby recovering the core.

7. A pneumatic pen according to claim 4, characterized in that: The triggering device (5) includes: a positioning rod (5.1), an upper protrusion (5.3) is installed at the upper end of the positioning rod (5.1) and a lower protrusion (5.2) is installed at the lower end. The positioning rod (5.1) passes through the middle of the positioning member (8) and has a gap between it and the through hole wall of the positioning member (8) to facilitate the passage of gas, or there is a gap between the positioning member (8) and the outer rod (1) to facilitate the passage of gas. When a sealed sealing chamber (11) is formed, the outer end of the lower protrusion (5.2) is a sealing contact surface.

8. A pneumatic pen according to claim 7, characterized in that: The lower end of the lower protrusion (5.2) is fixedly connected to the sealing block (5.21) as a sealing contact surface. The inner wall of the outer rod (1) is fixedly connected to a sealing partition, and the sealing partition has a through hole corresponding to the sealing block (5.21).

9. A pneumatic pen according to claim 4, characterized in that: It also includes a limiting structure, which includes a first guide rod (9) fixedly connected to both sides of the lower end of the positioning member (8), a crossbar is provided between a pair of first guide rods (9), and the crossbar passes through the inner guide groove (2.1) provided on both sides of the front rod (2) and is placed between the top of the writing instrument body (3) and the inner top wall of the front rod (2). The inner wall of the outer rod (1) is provided with a first guide groove that is adapted to the first guide rod (9), and the two ends of the crossbar are also positioned and connected in the first guide groove.

10. A pneumatic pen according to claim 1, 2, or 3, characterized in that: A positioning and limiting structure is also provided between the outer rod (1) and the front rod (2). The positioning and limiting structure includes a limiting ring (12) fixedly set on the bottom side wall of the front rod (2). A plurality of second guide rods (13) are fixedly provided on the circumferential side of the limiting ring (12). The bottom side wall of the outer rod (1) is provided with a second guide groove (14) that is adapted to the second guide rod (13). The inner wall of the outer rod (1) is provided with a slide corresponding to the limiting ring (12). It also includes a crossbar. Both ends of the crossbar are positioned and connected to the slide groove of the inner wall of the outer rod (1). The crossbar passes through the inner guide groove (2.1) provided on both sides of the front rod (2).

11. A pneumatic pen according to any one of claims 1 to 3, characterized in that: It also includes a limiting structure, which includes a limiting member (2.3). The top of the front rod (2) is provided with a limiting notch (2.2), and the inner wall of the outer rod (1) is provided with a limiting boss (1.1). The limiting member (2.3) is located between the front rod (2) and the outer rod (1). The limiting member (2.3) is matched and placed in the limiting notch (2.2), and the top of the limiting member (2.3) is restricted from rotating by the limiting boss (1.1).

12. A pneumatic pen according to claim 1, 2, or 3, characterized in that: The triggering device (5) is a pen clip (15). The pen clip (15) is connected to the outer rod (1) through a reset device (7), so that the pen clip (15) can be pulled up and down to trigger and release to reset. The top and bottom circumference of the pen clip (15) and the top of the outer rod (1) abut against each other, and the top of the front rod (2) and the bottom of the outer rod (1) abut against each other, thereby forming a sealed sealed chamber (11).

13. A pneumatic pen according to claim 12, characterized in that: The reset device (7) is a pen clip reset piece (151) or a hinge torsion spring.

14. A pneumatic pen according to claim 1, 2, 3, or 13, characterized in that: When the air pen is a resetting telescopic structure, a resetting structure is provided between the front rod (2) and the outer rod (1), or a core resetting component (4) is provided between the front rod (2) and the outer rod (1). The core retraction reset component (4) is located between the core outlet of the writing end and the writing end of the writing instrument body (3); The tail end of the writing instrument body (3) is fixed to the tail end of the front rod.

15. A pneumatic pen according to claim 3, characterized in that: A reset device (7) is provided between the positioning element (8) and the triggering device (5).

16. A pneumatic pen according to claim 3, characterized in that: The triggering device includes a positioning rod (5.1), with an upper protrusion (5.3) installed at the upper end and a lower protrusion (5.2) installed at the lower end. The positioning rod (5.1) passes through the top of the front rod (2). A pen clip (15) is connected to the outer periphery of the upper protrusion (5.3), and the pen clip (15) is located outside the outer rod (1), and the top of the pen clip is fixedly installed with the outer rod (1).

17. A pneumatic pen according to claim 16, characterized in that: The limiting structure includes a protrusion (20) on the pen clip (15), an opening (19) on the outer rod (1), and an annular groove (21) on the positioning member (8) that is adapted to the protrusion (20), and the protrusion (20) can pass through the opening (19).

18. A pneumatic pen according to claim 3, characterized in that: The top of the front rod (2) is separable from the main body of the front rod, and inner guide grooves (2.1) are provided on both sides of the main body of the front rod.

19. A pneumatic pen according to claim 1, 2, or 3, characterized in that: The sealing of the sealed chamber (11) is formed by at least one sealing ring (10); the sealing ring (10) is located inside the outer rod (1); when there is one sealing ring (10), the seal of the sealed chamber (11) is formed inside the sealing ring (10); when there are two or more sealing rings (10), the seal of the sealed chamber (11) is formed between multiple sealing rings (10); and the uppermost side of the sealed chamber (11) can be matched and sealed with the lower end of the trigger device (5), and the lowermost side can be matched and sealed with the top of the front rod (2).

20. A pneumatic pen according to claim 19, characterized in that: When there is one sealing ring (10), the inner wall cross section of the sealing ring (10) is inclined, and the inner diameter gradually decreases away from the front rod (2). The outer wall of the top end of the front rod (2) is also inclined.

21. A pneumatic pen according to claim 1, 2, 3, or 13, characterized in that: The front rod (2) is composed of a rod body (2a) and a core replacement component (2b) that are detachably connected.

22. A pneumatic pen according to claim 1, 2, 3, or 13, characterized in that: The sealing and unsealing of the sealed chamber (11) is achieved by the following method: the front rod (2) is pulled away from the outer rod (1) by force, and with the assistance of the core-resetting component (4), the front rod (2) releases the sealing state of the sealed chamber (11) and achieves the core-resetting state.

23. A pneumatic pen according to claim 1, 2, 3, or 13, characterized in that: It also includes a protective sleeve (16), which is fitted onto the front rod (2), and the front rod (2) is also provided with a one-way boss (22).

24. A pneumatic pen according to claim 23, characterized in that: It also includes a buffer spring (24); the protective sleeve (16) is provided with a trigger boss (161); the buffer spring (24) is located inside the protective sleeve (16).

25. A pneumatic pen according to claim 23, characterized in that: The front rod (2) is also provided with a buffer limiting boss (23), and the protective sleeve (16) is provided with a trigger boss (161).

26. A pneumatic pen according to claim 4, characterized in that: A reset device (7) is provided between the positioning element (8) and the triggering device (5).

27. A pneumatic pen according to claim 4, characterized in that: It also includes a limiting structure, which includes a limiting member (2.3). The top of the front rod (2) is provided with a limiting notch (2.2), and the inner wall of the outer rod (1) is provided with a limiting boss (1.1). The limiting member (2.3) is located between the front rod (2) and the outer rod (1). The limiting member (2.3) is matched and placed in the limiting notch (2.2), and the top of the limiting member (2.3) is restricted from rotating by the limiting boss (1.1).

28. A pneumatic pen according to claim 5, characterized in that: It also includes a limiting structure, which includes a limiting member (2.3). The top of the front rod (2) is provided with a limiting notch (2.2), and the inner wall of the outer rod (1) is provided with a limiting boss (1.1). The limiting member (2.3) is located between the front rod (2) and the outer rod (1). The limiting member (2.3) is matched and placed in the limiting notch (2.2), and the top of the limiting member (2.3) is restricted from rotating by the limiting boss (1.1).

29. A pneumatic pen according to claim 6, characterized in that: It also includes a limiting structure, which includes a limiting member (2.3). The top of the front rod (2) is provided with a limiting notch (2.2), and the inner wall of the outer rod (1) is provided with a limiting boss (1.1). The limiting member (2.3) is located between the front rod (2) and the outer rod (1). The limiting member (2.3) is matched and placed in the limiting notch (2.2), and the top of the limiting member (2.3) is restricted from rotating by the limiting boss (1.1).

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