JP5602614B2 - Pressurized writing instrument - Google Patents

Description

  The present invention has a writing tip at the tip of the ink storage cylinder in the shaft cylinder, and stores a writing body that is directly filled with the ink for the writing instrument, and pressurizes the rear end of the ink storage cylinder. By providing a mechanism and pressing a knock body that is urged rearward by a coil spring, the pressurizing mechanism is actuated to apply pressure to the space at the rear end of the ink storage cylinder, and the writing tip The present invention relates to a pressure-type writing instrument that protrudes from a tip opening of a shaft cylinder.

  Conventionally, a pressure-type writing instrument in which a pumping-type pressure mechanism is provided at the rear end portion of the ink containing cylinder and the pressure mechanism portion is operated by pressing the knock body is disclosed in Japanese Patent Application Laid-Open No. 2005-359365 “ As disclosed in the “fluid applicator”, a structure in which the rear end portion of the ink containing cylinder is sealed and is in a pressurized state in conjunction with the pushing operation of the knock mechanism is well known.

  In such a pressure-type writing instrument, in order to seal the rear end portion of the ink containing cylinder, in Japanese Patent Application Laid-Open No. 2007-152745 “Pressure pen”, the elastic body is compressed and deformed by a spherical elastic body, A structure that forms a space at the rear end of the ink containing cylinder is disclosed.

  In Japanese Patent Application Laid-Open No. 2009-154380, “ballpoint pens”, an elastic cylindrical body having both ends opened is disposed behind an ink storage cylinder, the pressing member is closed on the elastic cylindrical body, and the elastic cylindrical body is compressed and deformed. And the structure which compresses the space of the rear-end part of an ink storage cylinder is disclosed.

JP 2007-152745 A JP 2009-154380 A

  However, in Patent Document 1, it is necessary to compress the space after the knock body is pressed to compress the space at the rear end of the ink containing cylinder and the elastic body is pressed to obtain a seal. And the force which compresses an elastic body is required, high pressing force is required, and there existed a problem that operativity fell.

  An object of the present invention is to provide a pressure-type writing instrument that can reliably perform air-tightness of the rear end portion of an ink storage cylinder and can be easily knocked in a pressure-type writing instrument that pressurizes by a pressing operation of a knock body.

  The present invention provides a shaft cylinder having a writing tip at the tip of an ink storage cylinder, slidably storing a writing body formed by directly filling the ink for the writing instrument therein, and the rear of the ink storage cylinder. A pressure mechanism is provided at the end, and the pressure mechanism is actuated by pressing the knock body to apply pressure to the space at the rear end of the ink containing cylinder, and the writing tip is moved to the tip of the shaft cylinder. A pressure-type writing instrument protruding from an opening, wherein the pressure mechanism is capable of communicating with at least a rear end portion of an ink containing cylinder, and a cylinder having an air hole communicating with the rear end portion inside and outside, and the knock body It is equipped with a sealing member that is attached to the inner wall, closes the air hole of the cylinder, opens on the cylinder side, and has a bottomed cylindrical body having a bottom surface, and the knock body can be moved back and forth with the cylinder. Of the knock body The rear end of the cylinder is pressed against the inner wall of the bottom surface of the sealing member by advancing to close the air hole of the cylinder, and the cylinder is further advanced to compress the air in the sealed cylinder, Pressure is applied to the space at the rear end of the ink storage cylinder.

  In addition, the bottom surface of the sealing member has an inclined portion protruding toward the rear end side and the axial center side of the knock body, and a bottom portion provided between the inclined portions, and a cylinder is provided on the inner wall of the bottom portion. It is characterized by contacting.

Further, the thickness of the front Symbol bottom, with thicker than the thickness of the inclined portion, the cylinder, characterized in that in contact with the inner wall of the bottom.

  Furthermore, the knock body is arranged to be urged rearward by a coil spring, and the pressurizing mechanism is configured such that when the knock body is retracted, the cylinder and the sealing member are urged by the urging force of the coil spring. The cylinder is retracted after releasing the sealing, opening the air hole of the cylinder, and setting the inside end of the cylinder and the rear end of the ink containing cylinder to the same pressure as the atmospheric pressure.

  According to the configuration of claim 1 of the present invention, the pressurizing mechanism can communicate with at least the rear end portion of the ink containing cylinder, and has a cylinder having an air hole communicating with the inside and outside of the rear end portion, and the knock body. It is equipped with a sealing member that is attached to the inner wall, closes the air hole of the cylinder, opens on the cylinder side, and has a bottomed cylindrical body having a bottom surface, and the knock body can be moved back and forth with the cylinder. When the knock body is advanced, the rear end of the cylinder is pressed against the inner wall of the bottom surface of the sealing member to close the air hole of the cylinder, and the cylinder is further advanced to advance the sealing. Since the air in the cylinder is compressed and pressure is applied to the space at the rear end of the ink containing cylinder, a force is applied in the direction in which the sealing member extends, so that it can be sealed with a small force. During compression, compared with the case of compressing the sealing member is small influence on the operating force of the pushing member.

  In the present invention, the forward movement means moving in the direction of the tip opening of the shaft cylinder, and the movement in the opposite direction is defined as backward movement.

  The sealing member is most preferably formed of an elastic body in consideration of sealing performance. As elastic bodies, elastically deformable butyl rubber, fluorine rubber, butadiene rubber, styrene butadiene rubber, urethane rubber, other synthetic rubbers, thermoplastic elastomers, and other generally known elastic bodies are used. In consideration of the sealing property depending on the amount, it is preferable to use a non-air permeable or non-air permeable elastic body, and it is preferable to use epichlorohydrin rubber (CO) which is a synthetic rubber.

  According to the configuration of claim 2 of the present invention, the bottom surface of the sealing member includes an inclined portion that protrudes toward the rear end side and the axial center side of the knock body, and a bottom portion provided between the inclined portions. And the cylinder is in contact with the inner wall of the bottom portion, so that the sealing member is easy to extend, and the inclined portion is bent inward before the rear end portion of the cylinder is completely buried in the bottom portion. Since the rear end of the cylinder is wrapped, the sealing force can be increased.

  According to the configuration of claim 3 of the present invention, since the thickness of the bottom portion is thicker than the thickness of the inclined portion, the inclined portion is expanded by reducing the thickness of the inclined portion. It is easy to suppress the crack of the bottom by increasing the thickness of the bottom.

  According to the configuration of claim 4 of the present invention, the knock body is arranged to be biased rearward by a coil spring, and the pressing mechanism is attached to the coil spring when the knock body is retracted. By releasing the sealing of the cylinder and the sealing member by the force, opening the air hole of the cylinder, making the inside end of the cylinder and the rear end of the ink containing cylinder the same pressure as the atmospheric pressure, then the cylinder is retracted and sealed When releasing the space, it is possible to prevent a negative pressure state that is lower than the atmospheric pressure.

  In the case of a pressure-type writing instrument, when the pressurized state is released, it is necessary to return the sealed space to the original amount corresponding to the compressed space, and the pressurized space is released. At this time, if the pressure in the pressurizing space reaches near atmospheric pressure due to ink consumption or the like, a negative pressure state lower than the atmospheric pressure becomes a negative pressure state, and the ink for the writing instrument filled in the ink containing cylinder is This is because it is most preferable to have a negative pressure prevention mechanism because the ink may move to the rear end side of the ink storage cylinder and ink backflow may occur.

  According to the present invention, in the pressure-type writing instrument that pressurizes by a pressing operation of the knock body, the rear end portion of the ink containing cylinder can be surely airtight, and a pressure-type writing instrument that can be easily knocked can be provided.

1 is a longitudinal sectional view showing a pressure-type writing instrument of Example 1. FIG. It is a figure which shows the state which the writing front-end | tip part of the writing body in FIG. 1 protruded. FIG. 2 is an enlarged view of a main part, partly omitted in FIG. 1. FIG. 2 is an enlarged view of a main part, partly omitted in FIG. 1. It is an enlarged view which shows the sealing member in FIG.

  Next, examples of the shaft cylinder of the writing instrument of the present invention will be described with reference to the drawings, but the present invention is not limited to the following examples.

Example 1
A knock type writing instrument 1 shown in FIG. 1 to FIG. 5 comprises a shaft cylinder main body formed by screwing a front shaft 2 and a rear shaft 3, and a writing body H disposed in the shaft cylinder main body in the piston 5. While being detachably press-fitted and attached via the writing body holding member 9, the piston 5 and the writing body holding member 9 are interposed via the coil spring receiving member 13 by the coil spring 16 disposed between the coil spring receiving members 13 and 14. The pressure-type knocking type writing instrument provided with a protruding and retracting mechanism of the writing tip portion 12 in which the writing body H and the cylinder 6 are urged in the rear end direction of the rear shaft 3 so as to be slidable back and forth. 1.

  The mechanism for extending and retracting the writing tip 12 of the writing body H is conventionally known. When the knock body 4 is pressed in the direction of the tip opening 2a of the front shaft 2 (in the direction of arrow F in FIG. 1), the rear shaft 3 The locking portion 4a formed on the outer wall of the knock body 4 slidably disposed in the sliding hole 3a is locked to the locked portion 10a of the tip portion of the clip 10, and the writing tip portion of the writing body 12 is maintained in a state in which it protrudes from the front end opening 2a of the front shaft 2, the rear end of the clip 10 is pressed, and the locking portion 4a locked to the locked portion 10a of the clip is released. This is a retracting mechanism that allows the writing tip 12 of the writing body to be inserted into the tip opening 2 a of the front shaft 2 by the urging force of the spring 16.

  The rear end portion of the ink storage cylinder 11 of the writing body H is press-fitted and held by the writing body holding member 9 press-fitted into the piston 5, and the inside and outside of the piston 5 are moved from the air hole 5 a formed in the rear end portion of the piston 5. Communicated. In addition, a cylinder 6 is disposed so as to cover the piston 5, and a tip surface 6 a of the cylinder 6 abuts on an outer wall step portion 5 b formed on the outer wall of the piston 5, and the piston 5 is moved in front of the cylinder 6 in conjunction with the cylinder 6. 2 is arranged so as to be movable in the direction of the tip opening 2a. A spring 15 is disposed between the piston 5 and the knock body 4, and the knock body 4 is always urged toward the rear end of the rear shaft 3.

  The pressurizing mechanism and the retracting mechanism will be described in detail. When the knock body 4 is advanced from the position where the writing front end portion 12 is immersed in the direction of the front end opening 2a of the front shaft 2, first, the elastic body is press-fitted into the knock body 4. The rear end portion of the cylinder 6 contacts the inner wall of the bottom portion 8bb of the bottom surface 8b of the sealing member 8 made of a body. The cylinder 6 has an air hole 6b formed at the rear end thereof. Further, when the knock body 4 moves forward, the air hole 6b of the cylinder 6 is closed by the sealing member 8 and the inside of the cylinder 6 is sealed. Further, when the knock body 4 advances in the direction of the front end opening 2a of the front shaft 2, the cylinder 6 also advances in the direction of the front end opening 2a of the front shaft 2 and compresses the space in the cylinder 6.

  The ink containing cylinder 11 of the writing body H is press-fitted and held in the writing body holding member 9, and the writing body holding member 9 is press-fitted into the piston 5, and the outer wall surface of the piston 5 and the inner wall surface 6c of the cylinder 6 are The O-ring 7 is slidably sealed with each other, and the rear end portion of the ink storage cylinder 11 of the writing body communicates with the piston 5, and the piston 5 communicates with the inside of the cylinder 6 through the air hole 5a. The space portion in the piston 5 is also compressed by compressing the space portion in the cylinder 6 until the tip surface 6a of the cylinder 6 contacts the outer wall step portion 5b of the piston 5. As a result, pressure can be applied to the space at the rear end of the ink containing cylinder 11.

  When the knock body 4 is further advanced in the direction of the front end opening 2 a of the front shaft 2, the piston 5 and the writing body H are advanced through the cylinder 6, and the locking portion 4 a formed on the outer wall of the knock body 4 is A state where the space of the rear end portion of the ink containing cylinder 11 is compressed by being locked to the locked portion 10a of the front end portion, and a state where the writing front end portion 12 of the writing body protrudes from the front end opening portion 2a of the front shaft 2. Can be maintained.

  Further, when the locking portion 4 a locked to the locked portion 10 a of the clip 10 is released, first, the knock body 4 is retracted toward the rear end of the rear shaft 3 by the urging force of the spring 15. At this time, the sealing member 8 that has been in pressure contact with the rear end portion of the cylinder 6 also moves backward together with the knock body 4 in the rear end direction of the rear shaft 3, so the air hole 6 b of the cylinder 6 is opened, Further, the sealing of the piston 5 and the rear end portion of the ink containing cylinder 11 is released to make the pressure the same as the atmospheric pressure.

  Further, the piston 5, the writing body H, and the cylinder 6 are moved backward in the rear end direction of the rear shaft 3 by the biasing force of the coil spring 16, and the writing front end portion 12 of the writing body is immersed from the front end opening 2 a of the front shaft 2. A pressurizing mechanism and a retracting mechanism.

The writing body H has a writing tip portion 12 formed of a ballpoint pen tip holding a ball rotatably at the tip of the ink containing cylinder 11 and is not shown in the drawing. The oil-based ballpoint pen ink having an ink viscosity of 8000 mPa · s at 8 sec ⁻¹ (10 rpm) is directly filled.

  The sealing member 8 has an opening 8a that is open on the cylinder 6 side, a cylindrical press-fit portion 8c that is press-fitted into the knock body 4, and a bottom surface 8b. The bottom surface 8b is rearward and inward from the cylindrical press-fit portion 8a. And a bottom portion 8bb provided between the inclined portions 8ba. Further, the bottom 8bb is thicker than the inclined portion 8ba, and the rear end of the cylinder 6 is pressed against the inner wall of the bottom 8bb of the bottom 8b of the sealing member 8, so The hole 6b is closed. At this time, in the sealing member 8, the inclined portion 8ba extends and the inclined portion 8ba bends toward the axial center (in the direction of arrow G in FIG. 5), wraps around the rear end portion of the cylinder 6, and the air hole 6b of the cylinder 6 Therefore, even if the pressure contact force is small, a high sealing force can be obtained.

  The clip 10 is provided with a coil spring 17 between the support 3g formed on the outer wall of the rear shaft 3 and the inner wall of the clip 10, so that the tip of the clip 10 is constantly repelled toward the outer wall surface of the rear shaft 3. Attached. Further, by pressing the rear end portion of the clip 10, the connecting portion R between the clip 10 and the rear shaft 3 is used as a fulcrum, and the tip inner wall portion of the clip 10 can be separated from the rear shaft 3.

  The pressure to be pressurized is not particularly limited, but it is 1.05 to 2 from the atmospheric pressure in consideration of insufficient pressurization due to overwriting and ball dropout at the tip of the tip due to overpressure. Times, preferably 1.1 times or more.

  In this embodiment, the piston is press-fitted and attached to the rear end of the cursive body, but the ink container and the piston may be integrally formed. In addition, when the knock body is retracted, the cylinder and the knock body can move back and forth the distance to release the sealing of the cylinder air hole and the sealing member, and the cylinder is retracted in conjunction with the retraction of the knock body, It is not particularly limited.

Further, in this example, oil ballpoint pen ink, which is a Newtonian ink, is used for the sake of convenience, but it is not particularly limited, such as oil-based ink or water-based ink imparted with shear thinning, correction liquid, glue, etc. It is preferable to use oil-based ballpoint pen ink because the sag from the tip end is likely to occur due to pressurization. Moreover, since the writing quality will fall when the viscosity in 20 degreeC and the shear rate of 3.8 sec < ^-1 > (10 rpm) exceeds 10000 mPa * s, it will be 10,000 mPa * s or less, Preferably it shall be 8000 mPa * s or more. Moreover, since it will be easy to generate | occur | produce from a chip | tip tip if it is less than 100 mPa * s, it is most preferable to set it as 100 mPa * s or more and 10000 mPa * s or less.

The ink viscosity can be measured using a Brookfield DV-II viscometer (No. 27 rotor) under an environment of 20 ° C. and a shear rate of 3.8 sec ⁻¹ (10 rpm).

  The pressure-type writing instrument of the present invention is not limited to the type of ink and nib and the appearance mechanism, and can be widely used as a knock-type pressure-type writing instrument.

DESCRIPTION OF SYMBOLS 1 Pressure type writing instrument 2 Front shaft 2a Tip opening 3 Rear shaft 3a Sliding hole 4 Knock body 4a Locking portion 5 Piston 5a Air hole outer wall step 5b Outer wall step 6 Cylinder 6a Tip surface 6b Air hole 6c Inner wall 7 O Ring 8 Sealing member 8a Opening portion 8b Bottom surface 8ba Inclined portion 8bb Bottom portion 8c Cylindrical press-fit portion 9 Writing body holding member 10 Clip 10a Locked portion 11 Ink containing cylinder 12 Writing tip portion 13, 14 Coil spring receiving members 15, 16, 17 Coil spring H Cursive

Claims (4)

In the shaft cylinder, a writing tip is provided at the tip of the ink storage cylinder, and a writing body formed by directly filling the ink for the writing instrument is slidably stored therein, and is added to the rear end of the ink storage cylinder. By providing a pressure mechanism and pressing the knock body, the pressure mechanism is actuated to apply pressure to the space at the rear end of the ink storage cylinder, and the writing tip protrudes from the tip opening of the shaft cylinder. A pressure-type writing instrument, wherein the pressure mechanism is connected to at least a rear end portion of the ink containing cylinder, and a cylinder having an air hole communicating with the inside and outside of the rear end portion is attached to the inner wall of the knock body. A sealing member comprising a substantially bottomed cylindrical body having a bottom surface, which closes an air hole of the cylinder and has an opening on the cylinder side, and is arranged so that the knock body can move back and forth and interlock with the cylinder. By the advancement of the knock body The rear end of the cylinder is pressed against the inner wall of the bottom surface of the sealing member to close the air hole of the cylinder, and further, the air in the sealed cylinder is compressed by moving the cylinder forward to store ink. A pressure-type writing instrument that applies pressure to a space at a rear end of a cylinder. The bottom surface of the sealing member has an inclined portion that protrudes toward the rear end side and the axial center side of the knock body, and a bottom portion provided between the inclined portions, and a cylinder contacts the inner wall of the bottom portion. The pressure-type writing instrument according to claim 1, which is in contact with the pressure-type writing instrument. The pressure-type writing instrument according to claim 2, wherein a thickness of the bottom portion is greater than a thickness of the inclined portion . The knock body is arranged to be biased rearward by a coil spring, and the pressure mechanism releases the sealing of the cylinder and the sealing member by the biasing force of the coil spring when the knock body is retracted. 4. The cylinder according to claim 1, wherein the cylinder is retracted after the air hole of the cylinder is opened and the inside end of the cylinder and the rear end of the ink containing cylinder are set to the same pressure as the atmospheric pressure. The pressure-type writing instrument as described.

Images