Writing instruments with anti-drying device

Abstract

The present invention discloses a writing tool with an anti-drying device, comprising a pen barrel, and a pen tip, an ink tube and a pressing rod arranged in the pen barrel, the writing tool with the anti-drying device also includes an anti-drying device; the anti-drying device includes a switch sleeve, a lifting cap, a knock spring, a rotating closing cap, a closing pad and a supporting spring; the switch sleeve is inserted into the pen barrel, and elastic parts are respectively arranged on both sides of the upper end of the switch sleeve, and the switch sleeve is also provided with a lifting groove extending and distributed on the elastic part, and a rotating groove is arranged on the lower end side of the switch sleeve; the lifting cap is inserted into the switch sleeve, and supporting protrusions are respectively arranged on both sides of the upper end of the lifting cap, and the rotating closing cap is used to rotate to open and close the inlet and outlet holes.

Description

Technical Field

[0001] The present invention is a writing tool with an anti-drying device to prevent the pen tip from drying out, in particular, to prevent the water-based or volatile ink in a fluorescent pen or a marker pen with a push-to-extend or retract function from drying out. The writing tool is provided with an anti-drying device that rotates inside the lower part of the pen barrel to close the internal space. Background Art

[0002] Usually, a writing tool composed of a fluorescent pen or a marker pen with water-based or volatile ink is composed of a press-operated writing tool. The upper end of the writing tool is pressed repeatedly, and the pen tip is pushed outward and put inward as the pressing is performed.

[0003] In order to prevent the ink from drying up, Korean Patent 10-0556569 discloses a writing tool with an anti-drying structure, that is, the inside of the pen barrel is provided with an anti-drying structure to prevent external air from flowing in, and the anti-drying structure is rotatably arranged on one side on the inner side of the lower end of the pen barrel to isolate the pen tip from being exposed to the air.

[0004] However, in order to open and close the pen tip entrance and exit, traditional anti-drying structure writing tools rotate the spare part on the inner side of the pen shaft and close the lower end entrance. When the rotating spare part is operated, it cannot rotate smoothly due to friction. The spare parts are worn due to friction or damaged due to frequent operation, resulting in poor sealing function, so there is a problem that the ink cannot be prevented from drying out.

[0005] In order to prevent the ink from drying up, a rubber ring is placed in contact with the nib tube body in the ink cartridge to prevent air from flowing in along the nib side of the nib tube body, thereby preventing the ink from drying up. However, the friction between the rising and falling ink cartridge and the rubber ring causes the nib to move in and out unsmoothly. Summary of the invention

[0006] The present invention mainly solves the above-mentioned problems existing in conventional writing tools with anti-drying function. The rotating closure cap and the closure pad constituting the anti-drying device are tightly attached together, and the rotating closure cap rotates the switch when the pen tip is extended or retracted. The purpose is to prevent the rotating closure cap from generating friction during the rotation process, so that the process of opening and closing the pen shaft is gentle and smooth, and the reduction of airtightness due to friction and wear can be prevented.

[0007] Another purpose of the present invention is that the ink tube can descend along the lifting groove and apply pressure to the elastic part, and the elastic part expands and contracts inside the switch sleeve to prevent the elastic part from expanding outward and resetting, so that the switch sleeve does not rise and maintains a hanging state, so that the opening and closing operation of entering and exiting the pen tip is smoother.

[0008] In order to close the upper part of the pen barrel, there is no friction between the ink tube and the pen barrel when the pen barrel is raised and lowered, and the pen tip moves in and out more gently.

[0009] In order to achieve the purpose of the present invention, the present invention provides a writing tool with an anti-drying device, comprising a pen holder, a pen tip, an ink tube and a pressing rod arranged in the pen holder, wherein the pen tip is connected to the lower part of the ink tube, and the pressing rod is located at the upper part of the ink tube and is used to drive the ink tube to move in the pen holder, characterized in that:

[0010] A limiting protrusion, a mounting groove and a spring mounting surface are arranged on the inner wall of the lower end of the pen holder, the limiting protrusion is located above the spring mounting surface, and the mounting groove is located between the limiting protrusion and the spring mounting surface;

[0011] A fastening lifting protrusion and an anti-dropping clamping surface are provided on the outer wall of the ink tube, and the anti-dropping clamping surface is located above the fastening lifting protrusion;

[0012] The writing tool with an anti-drying device also includes an anti-drying device; the anti-drying device includes a switch cover, a lifting cap, a knock spring, a rotating closing cap, a closing pad and a supporting spring;

[0013] The switch sleeve is inserted into the pen holder, and elastic parts are respectively provided on both sides of the upper end of the switch sleeve, and the switch sleeve is also provided with a lifting groove extending and distributed on the elastic part, and an anti-pressure protrusion cooperating with the limit protrusion is provided on the outer side of the upper end of the elastic part, and a locking protrusion cooperating with the anti-dropping clamping surface is provided on the inner side of the upper end of the elastic part, and a rotating groove is provided on the side of the lower end of the switch sleeve;

[0014] The lifting cap is inserted into the switch cover, supporting protrusions are respectively arranged on both sides of the upper end of the lifting cap, and rotating shafts are respectively arranged on both sides of the lower end of the lifting cap, the fastening lifting protrusion and the supporting protrusion are arranged up and down and inserted into the lifting grooves on the corresponding sides, and the supporting protrusion is also inserted into the mounting groove;

[0015] The knock spring is inserted into the switch sleeve and is located between the lifting cap and the ink tube;

[0016] The rotating closing cap has a closing surface and a rotating support portion distributed on both sides of the closing surface, the rotating support portion is provided with an axial hole and a rotating operation protrusion, the rotating operation protrusion is eccentrically arranged on one side of the axial hole, the rotating shaft is inserted into the corresponding axial hole, and the rotating operation protrusion is inserted into the rotating groove;

[0017] The closing pad is provided with an inlet and outlet hole for the pen tip to enter and exit, the closing pad is located below the switch sleeve, the support spring is arranged between the closing pad and the spring mounting surface, and the rotating closing cap is used to rotate to open and close the inlet and outlet hole.

[0018] Furthermore, it also includes a pen clip; the pen clip is inserted into the upper end of the pen barrel, the pressing rod is inserted into the pen clip and connected to the ink tube, and a sealing ring is provided on the inner wall of the pen barrel, and the sealing ring contacts the outer wall of the pen clip.

[0019] Furthermore, an annular rubber groove is provided on the outer wall of the pressing rod, a sealing rubber ring is provided in the annular rubber groove, and the sealing rubber ring is located between the pen clip and the pressing rod.

[0020] Furthermore, a spring insertion groove is provided at the bottom of the closing pad, and the upper end of the supporting spring is inserted into the spring insertion groove.

[0021] Furthermore, the inner wall of the pen holder is provided with a plurality of rotating protrusions distributed around the center line of the pen holder; the outer tube wall of the ink tube is provided with a guide protrusion and a limiting step surface, and the limiting step surface is located above the guide protrusion;

[0022] The writing tool with anti-drying device also includes a tapping sleeve, the inner wall of the tapping sleeve is provided with lifting and tapping teeth distributed at equal intervals around its axis, and the lower end of the tapping sleeve is provided with annular teeth; the lifting and tapping teeth cooperate with the guide protrusion, and the annular teeth are clamped on the rotating protrusion.

[0023] Furthermore, when the pen tip retracts into the pen barrel, the closing surface of the rotating closing cap abuts against the closing pad and seals the inlet and outlet holes; when the pen tip extends out of the pen barrel, the closing surface of the rotating closing cap rotates to one side of the closing pad to open the inlet and outlet holes.

[0024] Compared with the prior art, the advantages and positive effects of the present invention are: it consists of a pen barrel, a pressing rod at the upper end of the pen barrel, an ink tube inserted into the inside of the pen barrel and raised and lowered with the pressing rod, and an anti-drying device for preventing the ink at the pen tip from drying out, the anti-drying device consists of a switch sleeve located at the lower part of the ink tube and capable of being inserted into a hollow structure, a lifting cap that can be lifted and lowered inside the switch sleeve, a rotating closing cap combined with the lower part of the lifting cap and rotating along the axial direction, a closing pad inserted into the lower inner part of the pen barrel and tightly attached to the rotating closing cap to allow the pen tip to move in and out, and a support spring that elastically supports the closing pad.

[0025] When the sealing pad is pressurized, the sealing cap is rotated to move relative to the switch sleeve. In order to prevent the upper elastic part from being squeezed and deformed by the ink tube and stretched outward, a protruding anti-pressure protrusion is formed on the inner side of the elastic part and a protruding locking protrusion is formed on the outer side.

[0026] The closing pad rises and falls at certain intervals on the inner side of the pen barrel. The inlet and outlet holes on the closing pad for entering and exiting the pen tip are closed by rotating the closing cap to one side to close the lower part of the pen barrel. A sealing rubber ring is provided on the inner side of the pen clip on the upper part of the pen barrel, so that the upper end of the ink tube contacts the sealing rubber ring, closing the inside of the pen barrel to prevent air circulation inside and outside, thereby preventing the ink from drying out.

[0027] Moreover, the inlet and outlet holes are opened and closed by driving the rotating closing cap to rotate. When rotating, the closing pad and the rotating closing cap are separated by the supporting spring, so no friction is generated, making the operation of opening and closing the inlet and outlet softer and smoother, and preventing damage between spare parts caused by friction.

[0028] As the pressing rod presses the pen tip, in order to make the pen tip follow the ink tube and the switch sleeve fastened to the lower part of the ink tube to rise and fall inside the pen barrel, the elastic parts on both sides of the switch sleeve are pushed outward through the ink tube during the pen tip descending operation, and the locking protrusion of the elastic part will be stuck on the upper part of the limiting protrusion inside the pen barrel, and the closing gasket under the downward pressure cannot rise by relying on the elastic force of the supporting spring, thereby stably maintaining the rotating sealing cap and the closing gasket in an isolated state.

[0029] In addition, there is no contact part between the ink tube and the pen barrel to prevent air from flowing in through the upper part of the pen barrel, making the pen tip's entry and exit operations gentler. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 It is an exploded oblique view in an example of the present invention.

[0032] Figure 2 It is an exploded cross-sectional view in an example of the present invention.

[0033] Figure 3 It is an oblique view in an example of the present invention.

[0034] Figure 4 It is a cross-sectional view of the operating state in an example of the present invention.

[0035] Figure 5 It is an oblique view showing the tapping operation state of the ink tube in an example of the present invention.

[0036] Figure 6 1 is a diagram showing the fastening sequence of the anti-drying device in the example of the present invention.

[0037] Figure 7 It is an oblique view showing the combined state of the lifting cap and the rotating closing cap in an example of the present invention.

[0038] Figure 8 It is an oblique view showing the main components of the anti-drying device in the example of the present invention.

[0039] Fig. 9 It is a cross-sectional view showing the descending state of the ink tube in the switch sleeve in the example of this method.

[0040] Fig.10 It is a cross-sectional view showing the operation sequence in an example of the present invention.

[0041] Fig.11 is to expand Fig.10 Part A is an enlarged cross-sectional view showing the ink tube and switch sleeve in operation.

[0042] Fig.12 It is a cross-sectional view showing the operation sequence of rotating the closing cap and the closing pad in the example of the present invention.

[0043] Fig.13 It is an enlarged view showing an example of the operation of rotating the closing cap and the closing pad in the example of the present invention.

[0044] Fig.14 It is a cross-sectional view of combining a sealing rubber ring on a pressing rod using another example.

[0045] Reference numerals:

[0046] 110: pen barrel, 111: sealing ring, 112: rotating protrusion, 113: mounting groove, 114: limiting protrusion, 115: spring mounting surface, 116: operating space, 120: pen clip, 130: ink tube, 131: limiting step surface, 132: guide protrusion, 133: fastening lifting protrusion, 134: anti-dropping clamping surface, 135: core coupling tube, 136: shielding surface, 140: knocking sleeve, 141: lifting and knocking teeth, 142: ring teeth, 150: pressing rod, 160: sealing rubber ring, 200 : Anti-drying device, 210: switch sleeve, 211: elastic part, 211a: anti-pressure protrusion, 211b: locking protrusion, 212: lifting groove, 213: rotating groove, 214: tapping spring, 220: lifting cap, 221: supporting protrusion, 222: rotating shaft, 230: rotating closing cap, 231: closing surface, 232: rotating support part, 233: shaft hole, 234: rotating operation protrusion, 240: closing pad, 241: entry and exit hole, 242: contact ring, 243: spring plug-in groove, 244: supporting spring. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] like Figure 1-Figure 14 As shown, the present invention comprises a pen barrel 110, a pen clip 120 disposed at the upper end of the pen barrel 110 and arranged on the pen barrel 110 by means of threads or clamping, a pressing rod 150 inserted into the interior of the pen barrel 110, a pen tip 1, an ink tube 130, and an anti-drying device 200 for sealing the front end of the pen barrel 110 to prevent the ink from drying out.

[0049] The ink tube 130 stores an ink filter 2 for supplying ink to the nib 1 disposed in the core coupling tube 135 .

[0050] A sealing ring 111 is provided at the upper inner end of the pen barrel 110 for contacting the periphery of the lower part of the pen clip 120 to close the internal connection part. A rotating protrusion 112 cooperating with the knocking sleeve 140 is provided at the central part of the pen barrel 110. An inclined surface is provided at the upper part of the rotating protrusion 112. The rotating protrusion 112 is extended to the lower part by a certain length. A mounting groove 113 for inserting the supporting protrusion 221 formed by the lifting cap 220 is also provided at the lower part of the rotating protrusion 112. A limiting protrusion 114 for preventing the switch sleeve 210 from rising again after descending is provided on the wall surface of the pen barrel 110 between two adjacent rotating protrusions 112. A spring mounting surface 115 for supporting the closing pad 240 and mounting the supporting spring 244 is provided at the lower inner part of the pen barrel 110.

[0051] An operating space 116 is provided on the upper portion of the spring mounting surface 115 for the inserted sealing pad 240 to be lifted or lowered according to a stroke under the support of the supporting spring 244 .

[0052] The pen clip 120 connected to the upper end of the pen shaft 110 is inserted into the sealing ring 111 to prevent gaps from being generated, thereby playing a role of sealing the upper part.

[0053] A sealing rubber ring 160 is provided inside the pen clip 120 , and the sealing rubber ring 160 seals the upper shielding surface 136 of the ink tube 130 and the pressing rod 150 that rises and falls in the open hole of the pen clip 120 to prevent external air from flowing into the closed pen barrel 110 through the gap.

[0054] The ink tube 130 with the pen tip 1 is inserted into the pen barrel 110 , a knocking sleeve 140 is arranged on the upper part of the ink tube 130 , and an anti-drying device 200 is arranged on the lower part of the ink tube 130 .

[0055] The ink tube 130 is provided with a limiting step surface 131 connected to the knocking sleeve 140 at the upper portion, and guide protrusions 132 for guiding the knocking sleeve 140 to slide are formed on both sides of the outer middle portion of the ink tube 130. The ink tube 130 is provided with a fastening lifting protrusion 133 for inserting into the lifting groove 212 formed through both sides of the switch sleeve 210 at the lower side of the guide protrusion 132, and an anti-dropping clamping surface 134 is formed on the upper side of the fastening lifting protrusion 133. The anti-dropping clamping surface 134 cooperates with the anti-pressure protrusion 211a of the switch sleeve 210. After the elastic parts 211 on both sides of the switch sleeve 210 return to their original positions and expand, the dimension between the two elastic parts 211 is larger than the dimension of the anti-dropping clamping surface 134 on the lower side. The bottom portion of the ink tube 130 is provided with a core coupling tube 135 for inserting the pen tip 1, and the top of the ink tube 130 is provided with a shielding surface 136 tightly attached to the sealing rubber ring 160.

[0056] The ink tube 130 and the pressing rod 150 can be connected together by a fixing method such as screw connection.

[0057] The knocking sleeve 140 has lifting and knocking teeth 141 distributed at equal intervals formed inside, and the diameter of the annular teeth 142 formed at the lower end of the knocking sleeve 140 is larger than the diameter of the circle formed by the lifting and knocking teeth 141.

[0058] The anti-drying device 200 is composed of a switch sleeve 210 inserted into the lower part of the ink tube 130, a lifting cap 220 that can move up and down in the switch sleeve 210, a tapping spring 214 located at the upper part of the lifting cap 220 to elastically support the ink tube 130, a rotating closing cap 230 combined with the lower part of the lifting cap 220 and can rotate, a closing pad 240 inserted into the inner side of the pen body 110 and tightly attached to the rotating closing cap 230 and used to expose the pen tip 1, and a support spring 244 that elastically supports the closing pad 240.

[0059] The lower part of the ink tube 130 is inserted into the switch sleeve 210. Elastic parts 211 cut and separated by a certain length are formed on both sides of the upper end of the switch sleeve 210. The switch sleeve 210 is provided with a lifting groove 212 extending to the two elastic parts 211 and penetrating at a certain length. The lower part of the switch sleeve 210 is formed with a rotating groove 213 with one side open and used to install the rotating closing cap 230.

[0060] The rotating operation protrusion 234 is installed in the rotating groove 213, and the rotating groove 213 forms an opening operation surface 213a for pulling the rotating operation protrusion 234 to rotate to open the inlet and outlet hole 241 of the closing pad 240. The rotating groove 213 also forms a closing operation surface 213b for pushing the rotating operation protrusion 234 to rotate to close the inlet and outlet hole 241.

[0061] An anti-pressure protrusion 211 a is formed on the inner side of the upper end of the elastic portion 211 , and a locking protrusion 211 b is formed on the outer side of the upper end of the elastic portion 211 for cooperating with the limiting protrusion 114 on the inner side of the pen holder 110 .

[0062] The tapping spring 214 supports the ink tube 130 to restore its elasticity and complete the tapping operation.

[0063] The lifting cap 220 is inserted downward from the upper end of the switch sleeve 210 to be combined, and support protrusions 221 are formed on both sides of the upper part of the lifting cap 220, and the support protrusions 221 are inserted into the lifting groove 212. The part of the support protrusion 221 protruding from the lifting groove 212 is also inserted into the installation groove 113, and rotating shafts 222 are formed on both sides of the lower part of the lifting cap 220, and the rotating shafts 222 are inserted into the rotating closing cap 230.

[0064] The rotating closing cap 230 is located at the lower part of the switch cover 210 , and the rotating operation protrusions 234 on both sides of the rotating closing cap 230 are inserted into the rotating grooves 213 and connected with the upper insertion lifting cap 220 .

[0065] The rotating closing cap 230 is tightly attached to the upper part of the closing pad 24. The rotating closing cap 230 has a spherical closing surface 231 for closing the lower part of the pen shaft 110, and a rotating support part 232 protruding upward on both sides of the closing surface 231. The center of the rotating support part 232 is formed with an axial hole 233 cut to one side for inserting the rotating shaft 222, the upper open operating surface 213a of the rotating groove 213 and the lower closed operating surface 213b, and a rotating operating protrusion 234 is also formed on the rotating support part 232.

[0066] The rotation operation protrusion 234 is eccentrically located above the shaft hole 233, and the switch sleeve 210 can move up and down relative to the center of the shaft hole 233 to drive the rotation closing cap 230 to complete the rotation operation.

[0067] When the rotary closing cap 230 is inserted and coupled from the side of the switch cover 210 , the rotary shaft 222 of the lifting cap 220 is inserted into the shaft hole 233 .

[0068] The sealing pad 240 is inserted from the open upper part of the pen holder 110, and the sealing pad 240 is penetrated in the center to form an inlet and outlet hole 241 for entering and exiting the pen tip. The outer side of the sealing pad 240 forms a contact ring 242 that contacts the inner wall of the pen holder 110. The sealing pad 240 is provided with a spring insertion groove 243 at the lower part. The support spring 240 for elastically supporting the sealing pad 240 is inserted into the spring insertion groove 243 to

[0069] To prevent the support spring 240 from falling off, the support spring 244 allows the closing pad 240 to be elastically and tightly attached to the rotating closing cap 230 .

[0070] In the embodiment of the present invention, an annular rubber groove 150 a is formed below the pressing rod 150 , and a tightening sealing rubber ring 160 is formed on the annular rubber groove 150 a . The sealing rubber ring 160 is in sliding contact with the inner wall of the pen clip 120 to block air circulation.

[0071] A sealing rubber ring 160 with an O-shaped structure is disposed in the annular rubber groove 150 a of the pressing rod 150 .

[0072] Next, the operation process of the present invention is described.

[0073] The present invention is composed of a pen body 110, a pressing rod 150 at the upper end of the pen body 110, and an anti-drying device 200 inserted into the pen body 110 to prevent the ink from drying up. The pressing rod 150 at the upper end of the pen body 150 is operated to drive the anti-drying device 200 to open and close the inlet and outlet hole 241 of the sealing pad 240 for the pen tip 1 to enter and exit. When the pen is not in use, the inlet and outlet hole 241 of the sealing pad 240 is closed by the anti-drying device 200 to prevent the ink from drying up.

[0074] When the pressing rod 150 is pressed, the pressing rod 150 drives the ink tube 130 to descend together, the limiting step surface 131 abuts against the knocking sleeve 140 at the bottom, and the anti-dropping clamping surface 134 pushes the anti-pressure protrusion 211a protruding from the upper end of the inner wall of the switch sleeve 210 to descend, and the descending switch sleeve 210 applies pressure to the closing pad 240 elastically supported by the supporting spring 244 at the bottom. After pressing for a certain distance, the rotating closing cap 230 and the closing pad 240 are separated, and the opening operating surface 213a of the rotating groove 213 will push the rotating operating protrusion 234 on the outer side of the rotating support part 232, so that the rotating closing cap 230 can be rotated, and then the inlet and outlet hole 24 of the closing pad 240 is opened, so that the nib 1 on the core-combining tube 135 of the ink tube 130 extends toward the bottom of the pen shaft 110.

[0075] On the one hand, when the limiting step surface 131 reaches the rotating protrusion 112 of the annular tooth 142 at the lower end of the knocking sleeve 140, it rotates and descends at a certain angle, and the rotating protrusion 112 is located on the edge of the annular tooth 142, positioning the operation of the knocking sleeve 140, and the pen tip 1 combined on the ink tube 130 extends toward the outside of the pen body 110.

[0076] The anti-detachment clamping surface 134 formed at the lower part of the ink tube 130 presses downward the anti-pressure protrusion 211a formed at the inner upper part of the switch cover 210, so that when the switch cover 210 descends, the lower support spring 244 elastically supports the closing pad 240, and the pressurized closing pad 240 descends by a certain distance and compresses the support spring 244, so that the closing pad 240 forms a certain interval with the rotating closing cap 230.

[0077] After the rotating closing cap 230 is separated from the closing pad 240, when the ink tube 130 continues to move downward, the upper open operating surface 213a of the rotating groove 213 formed at the lower end of the switch sleeve 210 will press the rotating operating protrusion 234, and the rotating closing cap 230 will rotate sideways with the rotating shaft 222 of the lifting cap 220 as the center to open the inlet and outlet hole 241 of the closing pad 240, and the pen tip 1 combined with the ink tube 130 will extend.

[0078] At this time, the difference between the moving distance A of the open operating surface 213a on the rotating operating protrusion 234 located in the rotating groove 213 and the moving distance a' when the switch sleeve 210 is moved down to reach the upper surface of the closing pad 240 is the same as the spacing height of the spacing a" of the rotating closing cap 230 leaving the closing pad 240. The rotating closing cap 230 rotates to open the inlet and outlet hole 241 of the closing pad 240, and no friction is generated between the two.

[0079] On the other hand, the switch sleeve 210 continues to move downward under the pressure of the ink tube 130, and the switch sleeve 210 continues to press the sealing pad 240 downward. When the sealing pad 240 moves to the bottom, the anti-pressure protrusion 211a and the locking protrusion 211b of the switch sleeve 210 are located below the internal limiting protrusion 114 of the pen body 110.

[0080] The switch cover 210 contacts the sealing pad 240 and moves down to the bottom, the anti-detachment clamping surface 134 separates from the anti-pressure protrusion 211a, and the elastic part 211 moves to the space below the limiting protrusion 114 and is squeezed and stretched.

[0081] After the elastic part 211 is stretched outward, the anti-pressure protrusion 211a is located above the anti-detachment clamping surface 134. When the elastic part 211 is stretched outward, the locking protrusion 211b protruding on the outside of the elastic part 211 abuts against the lower part of the limiting protrusion 114 of the pen shaft 110, so that the switch sleeve 210 is pressed on the closing pad 240 to maintain the rotating closing cap 230 and the closing pad 240 in a separated state.

[0082] When the pressing rod 150 is pressed again, the limiting step surface 131 presses the tapping sleeve 140 to move downward, and the downwardly moved tapping sleeve 140 releases the limiting of the lifting and lowering tapping teeth 141 to drive the pen tip 1 to retract.

[0083] At this time, the tapping spring 214 in the switch cover 210 will push the ink tube 130 upward, and the anti-detachment clamping surface 134 will stretch the elastic part 211 outward and move to its original position. The clamping state between the limiting protrusion 114 and the locking protrusion 211b of the pen body 110 is released, and the switch cover 210 moves upward.

[0084] During the upward movement of the switch cover 210 , the elastic force of the tapping spring 214 inside the switch cover 210 will push the ink tube 130 upward, and the fastening lifting protrusion 133 on the upwardly moving ink tube 130 will move along the lifting groove 212 upward and move to the upper end of the switch cover 210 .

[0085] When the switch cover 210 moves upward, the closed operation surface 213 b of the rotating groove 213 pulls the rotating operation protrusion 234 , and the rotating closing cap 230 rotates around the rotating shaft 222 , so that the closed surface 231 rotates and moves from the side of the switch cover 210 .

[0086] Under the elastic force of the support spring 244, the closing pad 240 moves up a certain distance in the operating space 116, and makes the closing surface 231 of the rotating closing cap 230 close to the inlet and outlet hole 241 of the closing pad 240. The support spring 244 applies pressure to the closing pad 240 to close the inlet and outlet hole 241 of the closing pad 240.

[0087] On the one hand, the upper part of the pen barrel 110 contacts the lower outer part of the pen clip 120 of the sealing ring 111 to form a seal, and the upper part of the interior of the pen clip 120 is sealed by the sealing rubber ring 110 to prevent air from flowing in and achieve a seal.

[0088] The hole formed by the sealing rubber ring 160 is larger than the outer diameter of the pressing rod 150 , so the sealing rubber ring 160 does not generate friction with the pressing rod 150 , and the tapping operation is gentle and smooth.

[0089] On the one hand, like other examples of the present invention, a sealing rubber ring groove 150a for installing a sealing rubber ring 160 is formed at the lower part of the pressing rod 150, and a sealing rubber ring 160 is arranged in the sealing rubber ring groove 150a. When the sealing rubber ring 160 contacts the open inner wall of the pen clip, when the pen tip 1 is in the extended state, a gap is generated between the pen clip 120 and the downward-moving pressing rod 150; and when the pen tip 1 is in the retracted state, the upward-moving pressing rod 150 is sealed and connected to the inner wall of the pen clip 120 through the O-ring sealing rubber ring 160.

Claims

1. A writing tool with an anti-drying device, comprising a pen holder, a pen tip, an ink tube and a pressing rod arranged in the pen holder, wherein the pen tip is connected to the lower part of the ink tube, and the pressing rod is located at the upper part of the ink tube and is used to drive the ink tube to move in the pen holder, characterized in that: A limiting protrusion, a mounting groove and a spring mounting surface are arranged on the inner wall of the lower end of the pen holder, the limiting protrusion is located above the spring mounting surface, and the mounting groove is located between the limiting protrusion and the spring mounting surface; A fastening lifting protrusion and an anti-dropping clamping surface are provided on the outer wall of the ink tube, and the anti-dropping clamping surface is located above the fastening lifting protrusion; The writing tool with an anti-drying device also includes an anti-drying device; the anti-drying device includes a switch cover, a lifting cap, a knock spring, a rotating closing cap, a closing pad and a supporting spring; The switch sleeve is inserted into the pen holder, and elastic parts are respectively provided on both sides of the upper end of the switch sleeve, and the switch sleeve is also provided with a lifting groove extending and distributed on the elastic part, and an anti-pressure protrusion cooperating with the limit protrusion is provided on the outer side of the upper end of the elastic part, and a locking protrusion cooperating with the anti-dropping clamping surface is provided on the inner side of the upper end of the elastic part, and a rotation groove is provided on the side of the lower end of the switch sleeve; The lifting cap is inserted into the switch cover, supporting protrusions are respectively arranged on both sides of the upper end of the lifting cap, and rotating shafts are respectively arranged on both sides of the lower end of the lifting cap, the fastening lifting protrusion and the supporting protrusion are arranged up and down and inserted into the lifting grooves on the corresponding sides, and the supporting protrusion is also inserted into the mounting groove; The knock spring is inserted into the switch sleeve and is located between the lifting cap and the ink tube; The rotating closing cap has a closing surface and a rotating support portion distributed on both sides of the closing surface, the rotating support portion is provided with an axial hole and a rotating operation protrusion, the rotating operation protrusion is eccentrically arranged on one side of the axial hole, the rotating shaft is inserted into the corresponding axial hole, and the rotating operation protrusion is inserted into the rotating groove; The closing pad is provided with an inlet and outlet hole for the pen tip to enter and exit, the closing pad is located below the switch sleeve, the support spring is arranged between the closing pad and the spring mounting surface, and the rotating closing cap is used to rotate to open and close the inlet and outlet hole.

2. The writing implement with an anti-drying device according to claim 1, characterized in that: It also includes a pen clip; the pen clip is inserted into the upper end of the pen barrel, the pressing rod is inserted into the pen clip and connected to the ink tube, and a sealing ring is provided on the inner wall of the pen barrel, and the sealing ring contacts the outer wall of the pen clip.

3. The writing tool with an anti-drying device according to claim 2, characterized in that: The outer wall of the pressing rod is provided with an annular rubber groove, a sealing rubber ring is provided in the annular rubber groove, and the sealing rubber ring is located between the pen clip and the pressing rod.

4. The writing implement with an anti-drying device according to claim 1, characterized in that: The bottom of the closing pad is provided with a spring inserting groove, and the upper end of the supporting spring is inserted into the spring inserting groove.

5. The writing implement with an anti-drying device according to claim 1, characterized in that: The inner wall of the pen holder is also provided with a plurality of rotating protrusions distributed around the center line of the pen holder; the outer tube wall of the ink tube is provided with a guide protrusion and a limiting step surface, and the limiting step surface is located above the guide protrusion; The writing tool with anti-drying device also includes a tapping sleeve, the inner wall of the tapping sleeve is provided with lifting and tapping teeth distributed at equal intervals around its axis, and the lower end of the tapping sleeve is provided with annular teeth; the lifting and tapping teeth cooperate with the guide protrusion, and the annular teeth are clamped on the rotating protrusion.

6. The writing tool with an anti-drying device according to any one of claims 1 to 5, characterized in that: When the pen tip is retracted into the pen barrel, the closing surface of the rotating closing cap abuts against the closing pad and seals the inlet and outlet holes; when the pen tip is extended out of the pen barrel, the closing surface of the rotating closing cap rotates to one side of the closing pad to open the inlet and outlet holes.

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