A sealing mechanism and a writing tool containing the same

Abstract

A sealing mechanism and a writing tool containing the same, comprising a pen barrel and an inner rod, wherein a pressing portion is provided at one end of the inner rod and a nib is provided at the other end, and a telescopic hole for the nib to pass through is provided at one end of the pen barrel; a first sealing ring is provided between the inner rod and the inner wall of the pen barrel, and a first elastic member is provided on the outer wall of the inner rod; a fixing member is provided in the pen barrel, and a circular seal is connected to one end of the fixing member close to the telescopic hole; a telescopic member is slidably sleeved on the inner wall of the fixing member, and a second elastic member is further provided between the telescopic member and the first sealing ring; when the nib is located in the pen barrel, the first elastic member drives the inner rod to pull the telescopic member to compress the second elastic member and the circular seal to block the telescopic hole; the pressing portion is pressed, the nib moves toward the end of the telescopic hole, the second elastic member is extended to drive the telescopic member to move with the nib and push open the circular seal; the nib continues to move toward the end of the telescopic hole, passes over the circular seal until the nib extends out of the telescopic hole; the present application has the advantages of single-handed control of writing, convenient writing method, simplified use steps, and can also ensure sealing at the nib.

Description

Technical Field

[0001] The present application relates to the technical field of writing tools, and more particularly to a sealing mechanism and a writing tool containing the same. Background Art

[0002] A push pen is a commonly used writing tool, which can extend and retract the pen core by pressing. Currently, most of them adopt a structure with a pen cap, which is sealed to prevent the ink in the pen core from drying up. However, with this pull-out cap structure, consumers need to hold the pen with one hand and pull out the cap with the other hand when using it. After pulling out the cap, the pen cap is easy to lose, which is troublesome to operate. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the present application provides a one-handed writing control method, which is convenient in writing, simplifies the use steps, and can also ensure a sealing mechanism at the pen tip.

[0004] In order to solve the above technical problems, the technical solution adopted by the present application is: a sealing mechanism, which includes a hollow pen holder and an inner rod arranged in the pen holder, one end of the inner rod is provided with a pressing portion and the other end is provided with a pen tip, and one end of the pen holder is provided with a telescopic hole for the pen tip to penetrate;

[0005] A first sealing ring is arranged between the inner rod and the inner wall of the pen barrel, a first elastic member is sleeved on the outer wall of the inner rod, and the first elastic member abuts between the first sealing ring and the radial step surface of the inner rod;

[0006] A fixing piece is arranged on the inner wall of the pen holder near the telescopic hole, and a circular seal is rotatably connected to one end of the fixing piece near the telescopic hole, and the circular seal is used to block the telescopic hole; a telescopic piece is slidably sleeved on the inner wall of the fixing piece, and a second elastic piece is also arranged between the telescopic piece and the first sealing ring;

[0007] The inner rod and the telescopic member can interfere with each other in radial direction. When the pen tip is located in the pen holder, the first elastic member drives the inner rod to pull the telescopic member to compress the second elastic member, and the circular seal blocks the telescopic hole.

[0008] When the pressing part is pressed and driven, in the first stage, the pen tip moves toward the telescopic hole end, and the second elastic member extends to drive the telescopic member to follow the pen tip to move toward the telescopic hole end and push open the circular seal; in the second stage, the pressing continues, and the pen tip continues to move toward the telescopic hole end and passes over the circular seal until the pen tip extends out of the telescopic hole.

[0009] With the above structure, the sealing mechanism of the present application, when the pen tip is located inside the pen barrel and is not in use, the first elastic member has a first elastic coefficient and is in a compressed state. The first elastic member has an axial driving force on the inner rod, and the driving force is opposite to the direction of the pen tip, thereby pulling the inner rod back in the opposite direction of the pen tip; due to the mutual interference between the inner rod and the telescopic member, the inner rod will drive the telescopic member to withdraw in the same direction, thereby compressing the second elastic member, the second elastic member has a certain second elastic coefficient and is in a compressed state, at which time the telescopic member will not push the circular seal, and the circular seal blocks the telescopic hole; the writing tool is sealed by the first sealing ring and the circular seal to prevent the ink inside from drying up; when it is needed to be used, the pressing part is pressed by one hand, and the pressing part drives the pen tip to move in the direction of the telescopic hole. In the first stage, since the inner rod moves in the direction of the telescopic hole and the interference state between the inner rod and the telescopic member changes, the second elastic member has an extended space to push the telescopic member to follow the pen tip in the direction of the telescopic hole. In this process, the telescopic member gradually pushes the circular seal The circular seal rotates circumferentially to avoid blocking the telescopic hole; the telescopic member is pushed to a position limited by the circular seal and the fixing member, and no longer moves forward axially; in the second stage, the pressing part is continuously pressed, and the pen tip passes through the circular seal and extends out of the telescopic hole until it is locked in the use state, and writing can be carried out. At this time, the first elastic member is in a compressed state; when not in use, the pen tip is pressed again, the locking state of the pen tip is released, and the first elastic member is extended to drive the pen tip to contract under the action of the restoring force. During the contraction process, the inner rod and the telescopic member contact and abut against each other again, driving the telescopic member to retract. At the same time, the telescopic member drives the circular seal to rotate circumferentially and reset to seal the telescopic hole again, and the initial state of the pen tip not in use is restored. The second elastic member is compressed between the first sealing ring and the telescopic member again, and the position of the pen tip is locked again by the locking mechanism of the press-type writing tool itself; therefore, the sealing mechanism of the present application does not need to be provided with a pen cap, and can realize the switching of the sealing and writing states of the pen tip, which can prevent the internal ink from drying up, and the extension and contraction of the pen tip can be realized by pressing with one hand during the whole process, and the operation is simpler and more convenient.

[0010] Furthermore, a push rod is provided at the front end of the telescopic member, and a push groove is provided on the corresponding circular seal. The push rod is used to cooperate with the push groove so that the telescopic member drives the circular seal to avoid or block the telescopic hole. With the above structure, when it is necessary to push open the circular seal, the push rod enters the push groove, gradually pushes the circular seal to rotate and avoid blocking the hole, so that the pen tip extends out; when retracting, the circular seal is rotated and reset again by pulling the push groove under the action of the retraction force of the push rod, thereby achieving re-sealing of the hole.

[0011] Furthermore, the push groove extends gradually and obliquely from its open end to the inside; adopting this structure is more conducive to the push rod pushing the circular seal to rotate circumferentially to avoid or block the hole, and the resetting and rotation are smoother.

[0012] Furthermore, a slider is provided on the outer wall of the telescopic part, and a slide groove is provided on the inner wall of the corresponding fixed part, and the slide groove and the slider are slidably matched; adopting this structure, the resetting process of the telescopic part's axial extension and retraction up and down can be made more accurate, and the driving of the circular seal can be made more stable.

[0013] Furthermore, there are two sliders, which are symmetrically distributed along the radial direction of the telescopic part. The structure in which sliders are arranged on both sides makes the upward and downward axial movement of the telescopic part more stable. Secondly, when assembling, there is no need to divide the assembly surface of the telescopic part. As long as one slider cooperates with the slide groove on the inner wall of the fixed part, the installation can be achieved.

[0014] Furthermore, the slide groove extends from the end close to the hole toward the end close to the first sealing ring on the inner wall of the fixed member, and its extension length is less than the extension length of the fixed member; that is, the extension length of the slide groove occupies the part of the axial length of the fixed member, and is not opened to the tail end of the fixed member close to the end where the first sealing ring is located; this arrangement can effectively limit the sliding position of the telescopic member relative to the fixed member, thereby preventing the telescopic member from sliding excessively and being unable to be accurately reset.

[0015] Furthermore, the elastic restoring force of the first elastic member is greater than the elastic restoring force of the second elastic member. With this solution, when the pen tip is located inside the pen barrel, i.e., in a non-use state, the first elastic member can drive the inner rod to radially abut against the telescopic member and pull the telescopic member into the fixed member under the action of the larger elastic restoring force. At this time, the second elastic member can be compressed by the telescopic member due to its small restoring force, and will not drive the telescopic member to push the circular seal. The circular seal can stably seal the telescopic hole.

[0016] Furthermore, the inner rod and the telescopic part can interfere with each other radially. Specifically, the outer wall of the inner rod is provided with a step surface protruding radially outward, and the corresponding telescopic part is provided with a step surface protruding radially inward, and the step surfaces of the two can abut against each other. With this structure, under the action of the restoring force of the first elastic part, the inner rod radially abuts against the telescopic part through the step surface, pulling the telescopic part toward the end away from the telescopic hole to compress the second elastic part. At this time, the telescopic part will not push the circular seal, and the circular seal can achieve a sealing effect on the telescopic hole.

[0017] Furthermore, a pressure block is arranged between the first sealing ring and the second elastic member, the pressure block contacts the first sealing ring, one end of the second elastic member abuts against the pressure block, and the other end abuts against the radial convex ring of the telescopic member; by adopting this structure, both ends of the first sealing ring are prevented from being abutted by the elastic member, thereby preventing the first sealing ring from being deformed and affecting the sealing effect; the second elastic member of the present application needs to be in a compressed state at all times when the pen tip is not extended, so there is always an elastic pushing force on the pressure block. If it abuts against the first sealing ring directly, it will inevitably cause long-term extrusion and deformation. By abutting against the pressure block, the extrusion of the first sealing ring can be avoided.

[0018] Furthermore, the pressure block is composed of a first columnar portion and a second columnar portion, and the outer diameter of the first columnar portion is larger than the outer diameter of the second columnar portion; the end face of the first columnar portion abuts against the second elastic member and the fixing member, and the step surface formed by the first columnar portion and the second columnar portion abuts against the first sealing ring; with the above structure, through the setting of the pressure block, the pressure block can be fixed between the first sealing ring and the fixing member, and when the first elastic member drives the first inner rod to pull the telescopic member to compress the second elastic member, a stable abutment is formed between one end of the second elastic member and the pressure block, thereby ensuring the stability of the restoring force of the second elastic member and better driving the telescopic member to push the circular seal.

[0019] Furthermore, a second sealing ring is provided between the circular seal and the telescopic hole, and the circular seal abuts against the second sealing ring when sealing the telescopic hole; with this structure, a tighter sealing effect can be formed here, preventing the pen tip from contacting the outside world and causing the ink inside to dry up.

[0020] The present application also provides a writing tool containing the sealing mechanism of the present application. The writing tool using the sealing structure can be switched between the use state and the non-use state by pressing operation with one hand. There is no need to set a pen cap, which is more convenient to operate. Moreover, when not in use, the pen tip can be effectively sealed with a good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the whiteboard pen in the non-use state (pen tip retracted) of the present application.

[0022] Figure 2 This application shows a schematic diagram of the structure of a whiteboard pen in use (the pen tip is extended).

[0023] Figure 3 This application presses the structural diagram of the whiteboard pen assembly diagram.

[0024] Figure 4 This is a structural schematic diagram of a cross-sectional view of the whiteboard pen in use state (pen tip retracted) according to the present application.

[0025] Figure 5 This is a structural schematic diagram of a cross-sectional view of the whiteboard pen in use state (pen tip extended) according to the present application.

[0026] Figure 6 This is a schematic diagram of the visible structure inside the whiteboard pen when the application is pressed and not in use (the pen tip is retracted).

[0027] Figure 7 This is a schematic diagram of the structure visible inside the whiteboard pen when the application is pressed and in use (the pen tip is extended).

[0028] Figure 8 A schematic diagram of the structure of the telescopic member of the present application.

[0029] Fig. 9 Schematic diagram of the structure of the fixing part of this application.

[0030] Fig.10 Schematic diagram of the structure of the fixing member and the circular seal assembly of the present application.

[0031] Fig.11 Schematic diagram of the structure of the pressure block and the first sealing ring of the present application.

[0032] Fig.12 A schematic structural diagram showing the positions of the first elastic member and the second elastic member located inside the pen barrel of the present application.

[0033] As shown in the accompanying drawings: 1. Pen body, 101. Telescopic hole, 2. Inner rod, 201. Pressing part, 202. Inner rod storing ink, 203. Pen tip, 3. Pen tip, 4. First sealing ring, 5. First elastic part, 6. Fixing part, 601. Slide groove, 602. Axis hole, 7. Circular seal, 701. Push groove, 702. Rotating shaft, 8. Telescopic part, 801. Push rod, 802. Slider, 803. Stopper, 9. Second elastic part, 10. Pressing block, 1001. First columnar part, 1002. Second columnar part, 11. Second sealing ring. DETAILED DESCRIPTION

[0034] The following will combine the embodiments and drawings to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only preferred embodiments, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention;

[0035] It should also be noted that: when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be another intermediate component, fixed through the intermediate component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be another intermediate component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be another intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only; the front and rear ends of this application are the front end when the pen tip is extended in the use state, and the rear end where the pressing part is located. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] As attached Figure 1-12 As shown, a sealing mechanism of the present application comprises a hollow pen holder 1 and an inner rod 2 arranged in the pen holder 1, one end of the inner rod 2 is provided with a pressing portion 201, and the other end is provided with a pen tip 3, and one end of the pen holder 1 is provided with a telescopic hole 101 for the pen tip 3 to penetrate;

[0037] A first sealing ring 4 is arranged between the inner rod 2 and the inner wall of the pen barrel 1, and a first elastic member 5 is sleeved on the outer wall of the inner rod 2. The first elastic member 5 abuts between the first sealing ring 4 and the radial step surface of the inner rod 2, and the first elastic member has a first elastic coefficient;

[0038] A fixing member 6 is provided on the inner wall of the end of the pen holder 1 close to the telescopic hole 101, and one end of the fixing member 6 close to the telescopic hole 101 is rotatably connected to a circular seal 7, and the circular seal 7 is used to block the telescopic hole 101; a telescopic member 8 is slidably sleeved on the inner wall of the fixing member 6, and a second elastic member 9 is further provided between the telescopic member 8 and the first sealing ring 4, and the second elastic member 9 has a second elastic coefficient;

[0039] The inner rod 2 and the telescopic member 8 can interfere with each other in radial direction;

[0040] When the pen tip 3 is located in the pen holder 1, the first elastic member 5 drives the inner rod 2 to pull the telescopic member 8 to compress the second elastic member 9, and the circular seal 7 blocks the telescopic hole 101;

[0041] When the pressing part 201 is pressed and driven, in the first stage, the pen tip 3 moves toward the end of the telescopic hole 101. During this process, the axial abutment position between the inner rod and the telescopic member changes, the second elastic member 9 has an extension space, and the extension process drives the telescopic member 8 to follow the pen tip 3 to move toward the end of the telescopic hole 101 and push open the circular seal 7; in the second stage, continue to press, the pen tip 3 continues to move toward the end of the telescopic hole 101, and passes over the circular seal 7 until the pen tip 3 extends out of the telescopic hole 101, until the pen tip is in the writing state.

[0042] Specifically, the present application can be further described in detail by taking a click-type pen as an example, as shown in the attached Figure 3-7 As shown, the inner rod 2 of the present application may include an ink storage inner rod 202, a nib 203 connected to the ink storage inner rod 202, and a pen tip 3 connected to the front end of the nib 203; that is, the ink storage inner rod 202, the nib 203 and the pen tip 3 are connected in sequence; and the tail end of the ink storage inner rod 202 (the other end opposite to the pen tip) can extend out of the tail end of the pen shaft 1 as a pressing portion 201, through which the inner rod 2 is pressed to axially drive the pen tip to retract; wherein the first elastic member 5 can be sleeved on the outer wall of the nib 203, and a step surface is provided on the outer wall of the ink storage inner rod 202 close to the nib 203 side, so that the first elastic member 5 is arranged between the step surface and the first sealing ring 4; and the second elastic member 9 is arranged between the first sealing ring 4 and the telescopic member 8, and the outer wall of the telescopic member 8 can also be abutted against the second elastic member through a radially protruding step surface.

[0043] With the above structure, the sealing mechanism of the present application, when the pen tip is located inside the pen barrel and is not in use, the first elastic member has a first elastic coefficient and is in a compressed state. The first elastic member has an axial driving force on the inner rod, and the driving force is opposite to the direction of the pen tip, thereby pulling the inner rod back in the opposite direction of the pen tip; due to the mutual interference between the inner rod and the telescopic member, the inner rod will drive the telescopic member to withdraw in the same direction, thereby compressing the second elastic member, the second elastic member has a certain second elastic coefficient and is in a compressed state, at which time the telescopic member will not push the circular seal, and the circular seal blocks the telescopic hole; the writing tool is sealed by the first sealing ring and the circular seal to prevent the ink inside from drying up; when it is needed to be used, the pressing part is pressed by one hand, and the pressing part drives the pen tip to move in the direction of the telescopic hole. In the first stage, since the inner rod moves in the direction of the telescopic hole and the interference state between the inner rod and the telescopic member changes, the second elastic member has an extended space to push the telescopic member to follow the pen tip in the direction of the telescopic hole. In this process, the telescopic member gradually pushes the circular seal The circular seal rotates circumferentially to avoid blocking the telescopic hole; the telescopic member is pushed to a position limited by the circular seal and the fixing member, and no longer moves forward axially; in the second stage, the pressing part is continuously pressed, and the pen tip passes through the circular seal and extends out of the telescopic hole until it is locked in the use state, and writing can be carried out. At this time, the first elastic member is in a compressed state; when not in use, the pen tip is pressed again, the locking state of the pen tip is released, and the first elastic member is extended to drive the pen tip to contract under the action of the restoring force. During the contraction process, the inner rod and the telescopic member contact and abut against each other again, driving the telescopic member to retract. At the same time, the telescopic member drives the circular seal to rotate circumferentially and reset to seal the telescopic hole again, and the initial state of the pen tip not in use is restored. The second elastic member is compressed between the first sealing ring and the telescopic member again, and the position of the pen tip is locked again by the locking mechanism of the press-type writing tool itself; therefore, the sealing mechanism of the present application does not need to be provided with a pen cap, and can realize the switching of the sealing and writing states of the pen tip, which can prevent the internal ink from drying up, and the extension and contraction of the pen tip can be realized by pressing with one hand during the whole process, and the operation is simpler and more convenient.

[0044] As attached Figure 6-7 As shown in FIG. 12 , the front end of the telescopic member 8 described in the present application is provided with a push rod 801 (i.e., a rod structure extending laterally along the outer wall of the telescopic member, as shown in FIG. Figure 7As shown, there are two of them, which are distributed on both sides of the outer wall of the telescopic member and symmetrically arranged), and the corresponding circular seal 7 is provided with a push groove 701, and the push rod 801 is used to cooperate with the push groove 701, so that the telescopic member 8 drives the circular seal 7 to avoid or block the telescopic hole 101; with the above structure, when it is necessary to push open the circular seal, the push rod enters the push groove, gradually pushes the circular seal to rotate and avoid blocking the hole, so that the pen tip extends; when retracting, under the action of the retraction force of the push rod, the push groove is pulled and the circular seal is rotated and reset again, so as to achieve re-sealing of the hole.

[0045] As attached Figure 6-7 As shown in Figures 12, the push groove 701 described in the present application extends gradually from its open end to the inside; that is, the push groove is an inclined groove arranged obliquely, gradually inclining toward the center position of the rotating surface of the circular seal. The adoption of this structure is more conducive to the push rod pushing the circular seal to rotate circumferentially to avoid or block the hole, and the resetting and rotation are smoother; the circular center seal of the present application has a partial spherical structure for blocking the hole, forming a circular blocking part, and being rotatably connected with the fixing part, and the other parts are arranged to avoid air, that is, the left and right sides of the plane of circumferential rotation are vacant, so that after the circular blocking part rotates, sufficient space for the pen tip to extend can be given.

[0046] As attached Figure 6-12 As shown, a slider 802 is provided on the outer wall of the telescopic member 8 described in the present application, and a slide groove 601 is provided on the inner wall of the corresponding fixed member 6, and the slide groove 601 is slidably matched with the slider 802; that is, the slide groove of the present application is axially extended along the inner wall of the fixed member, and the slider is slidably matched in the slide groove, so that it is convenient for the second elastic member to drive the telescopic member to slide up and down along the slide groove, thereby realizing the pushing and resetting of the circular seal; adopting this structure, the resetting process of the telescopic member's axial extension and retraction up and down can be made more accurate, and the driving of the circular seal can be more stable.

[0047] As attached Figure 3 As shown, the sliders 802 described in the present application are provided with two pieces and are symmetrically distributed along the radial direction of the telescopic member 8; the structure in which the sliders are provided on both sides makes the telescopic member more stable in the vertical axial operation, and secondly, when assembling, there is no need to divide the assembly surface of the telescopic member, and the installation can be achieved as long as there is a slider that cooperates with the slide groove on the inner wall of the fixed member; the telescopic member described in the present application can be a complete cylindrical structure, or as shown in the attached Figure 8 As shown, the lower part is a hollow cylinder, a side wall is provided on one side of the upper part, and the other side is empty, so as to provide accommodation space for the circular seal after circumferential rotation.

[0048] As attached Fig. 9As shown, the slide groove 601 described in the present application extends on the inner wall of the fixed member 6 from the end close to the telescopic hole 101 toward the end close to the first sealing ring 4, and its extension length is less than the axial length of the fixed member 6; that is, the extension length of the slide groove occupies the part of the axial length of the fixed member, and is not opened to the tail end of the fixed member close to the end where the first sealing ring is located; this arrangement can effectively limit the sliding position of the telescopic member relative to the fixed member, thereby preventing the telescopic member from sliding excessively and being unable to be accurately reset.

[0049] As an example, the elastic restoring force of the first elastic member 5 described in the present application is greater than the elastic restoring force of the second elastic member 9 (the elastic restoring force refers to the ability of a spring to return to its original state after the external force disappears after being subjected to an external thrust or tension); that is, the first elastic coefficient of the first elastic member is greater than the second elastic coefficient of the second elastic member (the larger the elastic coefficient of a spring, the stronger its ability to return to its original state after being subjected to force, and the greater its elastic force; the first elastic member and the second elastic member can adopt straight spring structures with different elastic coefficients); by adopting this scheme, when the pen tip is located inside the pen barrel, that is, in a non-use state, under the action of the larger elastic restoring force of the first elastic member, the inner rod can be driven radially to abut against the telescopic member and pull the telescopic member to be located inside the fixed member. At this time, the second elastic member can be compressed by the telescopic member due to its small restoring force, and will not drive the telescopic member to push the circular seal. The circular seal can stably seal the telescopic hole.

[0050] As attached Figure 4-5 As shown, the inner rod 2 and the telescopic member 8 described in the present application can interfere with each other radially. Specifically, the outer wall of the inner rod 2 is provided with a step surface protruding radially outward, and the corresponding telescopic member 8 is provided with a step surface protruding radially inward, and the step surfaces of the two can abut against each other. With this structure, under the action of the restoring force of the first elastic member, the inner rod abuts against the radial step surface of the telescopic member through the step surface radially, pulling the telescopic member to be compressed toward the end away from the telescopic hole to achieve compression of the second elastic member. At this time, the telescopic member will not push the circular seal, and the circular seal can achieve a sealing effect on the telescopic hole.

[0051] As attached Figure 3-5As shown, a pressure block 10 is arranged between the first sealing ring 4 and the second elastic member 9 described in the present application, and the pressure block 10 contacts the first sealing ring 4, one end of the second elastic member 9 abuts against the pressure block 10, and the other end abuts against the radial convex ring of the telescopic member 8 (that is, the outer wall of the telescopic member is provided with a radial convex ring protruding outward and abuts against the second elastic member); adopting this structure, it is avoided that both ends of the first sealing ring are abutted by the elastic member, thereby avoiding the first sealing ring from deforming and affecting the sealing effect; the second elastic member of the present application needs to be in a compressed state at all times when the pen tip is not extended, so there is always an elastic pushing force on the pressure block. If it directly abuts against the first sealing ring, it will inevitably cause it to be squeezed for a long time and deformed. Abutting against the pressure block can avoid squeezing of the first sealing ring.

[0052] As attached Figure 3-7 As shown in Figures 1 and 11, the pressing block 10 described in the present application is composed of a first columnar portion 1001 and a second columnar portion 1002, and the outer diameter of the first columnar portion 1001 is larger than the outer diameter of the second columnar portion 1002; the end face of the first columnar portion 1001 abuts against the second elastic member 9 and the fixing member 6, and the step surface formed by the first columnar portion 1001 and the second columnar portion 1002 abuts against the first sealing ring 4 (an axial groove is provided at this end of the first sealing ring, the end face of the groove is for the first columnar portion to abut, and the groove is for the second columnar portion to extend into); with the above structure, through the setting of the pressing block, the pressing block can be fixed between the first sealing ring and the fixing member, and when the first elastic member drives the first inner rod to pull the telescopic member to compress the second elastic member, a stable abutment is formed between one end of the second elastic member and the pressing block, thereby ensuring the stability of the restoring force of the second elastic member and better driving the telescopic member to push the circular seal.

[0053] As attached Figure 3-5 As shown, a second sealing ring 11 is further provided between the circular seal 7 described in the present application and the telescopic hole 101, and the circular seal 7 abuts against the second sealing ring 11 when blocking the telescopic hole 101; that is, the second sealing ring is provided on the inner wall of the pen body close to the telescopic hole end, and can achieve effective sealing there when the circular seal blocks the telescopic hole. Combined with the first sealing ring, it can effectively prevent air leakage in the pen body, achieve a more ideal sealing effect, and prevent the pen tip from contacting the outside world and causing the ink inside to dry up.

[0054] Specific details are as follows Figure 1-5 As shown, the present application also provides a writing tool containing the sealing mechanism of the present application. The writing tool using this sealing structure can be switched between the use state and the non-use state by pressing operation with one hand. There is no need to set a pen cap, which is more convenient to operate. Moreover, when not in use, the pen tip can be effectively sealed with good sealing effect.

[0055] As an example, the attached Figure 3 , 10 As shown, the fixing member 6 described in the present application is provided with an axial hole 602, and the corresponding circular seal 7 is provided with a rotating shaft 702, and the rotating shaft 702 is rotatably matched in the axial hole 602, and the circumferential extension area of ​​the rotating shaft 702 can be set here to be smaller than the circumferential extension area of ​​the axial hole 702; that is, the rotating shaft on the circular seal of the present application is a semicircular structure of about one-half, and the axial hole on the fixing member is a multi-semicircular hole of about three-quarters, that is, a limit block extending inward and protruding is provided in the axial hole so that the axial hole is partially blocked, so that the circular seal can be limited by the limit block during the process of being pushed and rotated by the telescopic member, avoiding excessive rotation, which can effectively avoid blocking the hole, and at the same time, it can also be more accurately reset during the resetting process of the circular seal and realize the blocking of the hole again; of course, the rotating shaft and the axial hole of the present application can be a complete circle, and the telescopic member of the present application can also not have one side to avoid air, and the outer wall of the upper cylinder can also be made thin to provide space for the circular seal to be accommodated after rotation.

[0056] As an example, the attached Figure 3 , 8 As shown, a stopper 803 is further provided on the outer wall of the telescopic member 8 near the circular seal 7 end described in the present application, and the stopper 803 can interfere with the radially extending wall of the fixed member 6, that is, the radial protruding length of the stopper 803 and the wall of the fixed member can achieve blocking; adopting this structure, the position where the telescopic member is reset can be effectively limited by the fixed member, avoiding the telescopic member from excessively retracting and disengaging from the pushing force on the circular seal.

[0057] The pen tip of the writing tool of the present application is fixed in the writing state and the retracted state, which are all formed by the conventional structure and pressing principle of the existing push pen, and will not be described in detail here; the most critical invention point of the present application lies in the setting of the sealing mechanism, through which the sealing and writing state switching can be achieved by pressing with one hand, without the need for an additional pen cap structure, which is more conducive to operation.

[0058] The pressing portion and the ink storage inner rod of the present application can be an integrated structure, in which the ink is stored, and the pressing portion extends out of the pen shaft, so that a pressing operation on the pressing portion can be achieved.

[0059] The sealing mechanism of the present application constitutes the installation process, working principle and action process of the pen: first, the pen tip is installed on the pen nozzle, and then inserted into the ink storage inner rod (with built-in ink); the first elastic member is sleeved on the outside of the pen nozzle, and then the first sealing ring, the pressure block and the second elastic member are installed in sequence; then the fixing member is sleeved on the outside of the second elastic member and one end of it is against the pressure block, and then the telescopic member is installed in the fixing member and slides with each other through the slider and the slide groove. At this time, the second elastic member is located between the pressure block and the radial protrusion of the telescopic member; according to the assembly relationship between the fixing member and the telescopic member and the buckle position thereon, the circular seal is installed so that the circular seal and the fixing member (the front end of the fixing member extends out of the protruding part, and the axial hole is set on the protruding part) are in contact with each other. The second sealing ring is then installed into the head of the pen barrel, and the above-assembled components are then installed into the inside of the pen barrel, the first sealing ring is fixedly sealed between the inner wall of the pen barrel and the outer wall of the nib, and the fixing part can be fixed on the inner wall of the pen barrel; the specific action process of the assembled writing tool: in the initial non-use state, the pen tip is located inside the pen barrel and is fixed in this position by the locking mechanism, at this time, the first elastic part is in a compressed state, and pushes in the direction where the pressing part is located, driving the inner rod to pull the telescopic part to push in the same direction, compressing the second elastic part between the telescopic part and the pressing block; when the inner rod is pressed by the pressing part, in the first stage, the pen tip As the pen moves closer to the telescopic hole, the first elastic member is compressed, and the position of interference between the telescopic member and the inner rod changes. At this time, the second elastic member has space to extend, thereby pushing the telescopic member to follow the pen tip and move toward the telescopic hole at the same time, and pushing open the circular seal (the circular seal rotates axially around the fixing member under the interaction of the pushing rod and the pushing groove, avoiding blocking the telescopic hole and providing space for the pen tip to extend); continue to press to the second stage, the pen tip continues to extend toward the telescopic hole, passes the circular seal and extends out of the telescopic hole. The pen tip is in a writing state, and the position can be fixed by pressing the locking mechanism of the pen itself for writing; when the pen tip needs to be retracted, the pressing part is pressed again. The pen tip is unlocked and the pressure is released. At this time, the first elastic part stretches to generate a restoring force. Under the action of the restoring force, the inner rod and the telescopic part are again abutted against each other, and the telescopic part is pulled back toward the pressing part. The push rod on the telescopic part and the push groove of the circular seal interact with each other, and the circular seal is rotated and pulled back to its original position to seal the telescopic hole again. In this process, the telescopic part compresses the second elastic part again, and the pen tip is retracted into the pen body to a non-use state and locked and fixed; the first sealing ring of the present application is fixed on the outside of the inner rod and is located at the rear end of the fixing part (one end close to the pressing part), which can prevent air from entering the inside of the pen body. The second sealing ring of the present application is fixed on the pen body near the telescopic hole, which can support the circular seal and prevent air leakage.

Claims

1. A sealing mechanism, characterized in that: The mechanism comprises a hollow pen holder (1) and an inner rod (2) arranged in the pen holder (1); one end of the inner rod (2) is provided with a pressing portion (201) and the other end is provided with a pen tip (3); one end of the pen holder (1) is provided with a telescopic hole (101) for the pen tip (3) to penetrate; A first sealing ring (4) is arranged between the inner rod (2) and the inner wall of the pen holder (1); a first elastic member (5) is sleeved on the outer wall of the inner rod (2); and the first elastic member (5) abuts between the first sealing ring (4) and the radial step surface of the inner rod (2); A fixing member (6) is arranged on the inner wall of the pen holder (1) near the telescopic hole (101), and one end of the fixing member (6) near the telescopic hole (101) is rotatably connected to a circular seal (7), and the circular seal (7) is used to seal the telescopic hole (101); a telescopic member (8) is slidably sleeved on the inner wall of the fixing member (6), and a second elastic member (9) is further arranged between the telescopic member (8) and the first sealing ring (4); The inner rod (2) and the telescopic member (8) can interfere with each other in radial direction. When the pen tip (3) is located in the pen holder (1), the first elastic member (5) drives the inner rod (2) to pull the telescopic member (8) to compress the second elastic member (9), and the circular seal (7) blocks the telescopic hole (101). In the process of the pressing portion (201) being pressed and driven, in the first stage, the pen tip (3) moves toward the end of the telescopic hole (101), and the second elastic member (9) extends to drive the telescopic member (8) to follow the pen tip (3) to move toward the end of the telescopic hole (101) and push open the circular seal (7); in the second stage, the pressing is continued, and the pen tip (3) continues to move toward the end of the telescopic hole (101) and passes over the circular seal (7) until the pen tip (3) extends out of the telescopic hole (101).

2. The sealing mechanism according to claim 1, characterized in that: A push rod (801) is provided at the front end of the telescopic member (8), and a push groove (701) is provided on the corresponding circular seal (7). The push rod (801) is used to cooperate with the push groove (701) so that the telescopic member (8) drives the circular seal (7) to avoid or block the telescopic hole (101).

3. The sealing mechanism according to claim 2, characterized in that: The push groove (701) extends gradually and obliquely from its opening end to the inside.

4. The sealing mechanism according to claim 1, characterized in that: A sliding block (802) is arranged on the outer wall of the telescopic member (8), and a sliding groove (601) is arranged on the corresponding inner wall of the fixing member (6), and the sliding groove (601) and the sliding block (802) are slidably matched.

5. The sealing mechanism according to claim 4, characterized in that: The sliding blocks (802) are provided in two pieces and are symmetrically distributed along the radial direction of the telescopic member (8).

6. The sealing mechanism according to claim 5, characterized in that: The slide groove (601) extends on the inner wall of the fixing member (6) from an end close to the telescopic hole (101) toward an end close to the first sealing ring (4), and its extension length is less than the axial length of the fixing member (6).

7. The sealing mechanism according to claim 1, characterized in that: The elastic restoring force of the first elastic member (5) is greater than the elastic restoring force of the second elastic member (9).

8. The sealing mechanism according to claim 1, characterized in that: The inner rod (2) and the telescopic member (8) can interfere with each other radially, and the outer wall of the inner rod (2) is provided with a step surface protruding radially outward, and the corresponding telescopic member (8) is provided with a step surface protruding radially inward, and the step surfaces of the two can abut against each other.

9. The sealing mechanism according to claim 1, characterized in that: A pressure block (10) is provided between the first sealing ring (4) and the second elastic member (9); the pressure block (10) contacts the first sealing ring (4); one end of the second elastic member (9) abuts against the pressure block (10) and the other end abuts against the radial convex ring of the telescopic member (8).

10. The sealing mechanism according to claim 9, characterized in that: The pressure block (10) is composed of a first columnar portion (1001) and a second columnar portion (1002), and the outer diameter of the first columnar portion (1001) is greater than the outer diameter of the second columnar portion (1002); the end surface of the first columnar portion (1001) abuts against the second elastic member (9) and the fixing member (6), and the step surface formed by the first columnar portion (1001) and the second columnar portion (1002) abuts against the first sealing ring (4).

11. The sealing mechanism according to claim 1, characterized in that: A second sealing ring (11) is also provided between the circular seal (7) and the telescopic hole (101), and the circular seal (7) abuts against the second sealing ring (11) when sealing the telescopic hole (101).

12. A writing tool, characterized in that: The writing tool comprises the sealing mechanism according to any one of claims 1 to 11.

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