JP2005262590A - Ejection-type ball-point pen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost ejection-type ball-point pen free from ink break or blurring by virtue of pressure in an upward writing position and capable of being used for writing with assistance of pressurized ink which is apt to break or blur during an initial writing. <P>SOLUTION: In this ejection-type ball-point pen, a securing element interlocked with an ejection part, is secured to an advancing/receding position inside a barrel by moving the ejection part forward/backward, and a sealing ring which comes into contact tightly with the inner surface of a cylindrical body installed inside the barrel, is provided in a shaft part positioned forward of the securing element and a fitting cylinder extending forward from the forward end of the securing element is provided. In addition, a sealing element with a projecting sealing part in an inner hole, is fixed inside the cylindrical body and the cylindrical part is airtightly cut apart before and after the sealing part by the tight contact of the sealing part with the forward outer periphery of the fitting cylinder. Further, the rear end of an ink storage tube and the forward end of the securing element are air-permeable with each other, and the ink storage tube is fitted into the fitting cylinder. Besides, a space part between the rear end of the sealing element and the forward end of the securing element is diminished during operating the ejection part by the urging of the securing element to the rear of the barrel by a return spring and consequently, the rear end of the ink is pressurized. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is equipped with a ballpoint pen refill so that the writing tip can protrude from the shaft tip by knocking, and the fluidity of the ink toward the tip side is supported by the pressurizing operation at the time of knocking. It relates to a knock-type ballpoint pen.

JP 2001-150865 A 2-108087 JP-A-8-072479 Japanese Utility Model Publication No. 49-35643 (Patent Document 1) A pumping-type pressurizing mechanism is provided at the rear end of the shaft cylinder, and is arranged in front of it and in contact with the rear end of the ink so as to follow the ink consumption. A valve mechanism is arranged at the rear end of the follower, and air is pushed into the rear end hole of the shaft cylinder by the forward movement of the pressurizing mechanism, and at that time, the valve opens at a predetermined pressure and the rear of the follower There has been proposed one configured to support the fluidity of the ink toward the tip side by pressurizing the end. However, this has a drawback that the structure is complicated and the cost is somewhat high. (Patent Documents 2 to 4) Also, a so-called knock-type ballpoint pen that knocks the rear end and locks the writing tip from the shaft tip so as to be able to protrude and retract is known.

  The present invention does not run out of ink in upward writing, and also uses a ballpoint pen that uses ink that is easy to break in initial writing, a ballpoint pen in which various fillers are mixed in the ink, and the handwriting written on the paper surface is rubbed with an eraser. Can provide a knock-type ballpoint pen that can be easily written by supporting the pressure at the time of knocking, such as a ballpoint pen filled with ink that can be easily erased. And

The present invention has the following configuration in order to achieve the above-described problems.
The knock type ballpoint pen according to the first aspect of the present invention includes a ballpoint pen tip at the front end and an ink storage tube at the rear, and a ballpoint pen refill in which the ink storage tube is filled with ink, and the ballpoint pen refill mounted thereon. In a knock-type ballpoint pen that allows the writing tip to protrude and retract from the front end hole in front of the cylinder, by moving the knock part protruding from the rear end of the shaft cylinder back and forth, the interlocking body interlocking with it is moved forward in the shaft cylinder. Locked in the retracted position, a seal ring is provided on the outer periphery of the shaft portion in front of the locking body and in close contact with the inner surface of the shaft cylinder or the inner surface of the cylinder body provided in the shaft cylinder, and extends forward from the front end of the locking body And a seal body having a projecting seal portion in the inner hole is fixed in the shaft cylinder or in the cylinder body provided in the shaft cylinder in front of the front end of the locking body. Seal on the front periphery The cylinder inside the cylinder or the cylinder inside the cylinder is divided in an airtight manner before and after the seal portion, and the rear end of the ink storage tube and the front end of the locking body are provided to be ventilated. In addition, the ink storage tube of the ballpoint pen refill is fitted into the mounting cylinder, and the ballpoint pen feeler, the mounting cylinder and the locking body are urged to the rear of the shaft cylinder by a return spring, knocking the knocking portion and The space formed between the rear end of the seal body and the front end of the lock body is reduced when locked in the forward position, so that the ink rear end of the ballpoint pen refill is pressurized. Become.

  A knock type ballpoint pen according to a second aspect of the present invention is the knock type ballpoint pen according to the first aspect, wherein a knock bar and a rotor having a cam portion and a rib in a cam barrel portion provided in the shaft barrel are provided. A shaft ring is inserted so as to be capable of axial movement, and a shaft ring inner surface in front of the rotor is provided with a shaft ring inner surface or a seal ring that is in close contact with a cylinder portion inner surface provided in the shaft cylinder.

  A knock type ballpoint pen according to a third aspect of the present invention is the knock type ballpoint pen according to the first aspect, wherein a cylindrical body is provided in the shaft cylinder, and the cylindrical body is in relation to the shaft cylinder. Only rotation is provided freely.

  According to a fourth aspect of the present invention, there is provided the knock type ballpoint pen according to the first aspect, wherein a mounting cylinder is provided separately on the axis of the locking body.

  The present invention does not run out of ink in upward writing, and also uses a ballpoint pen that uses ink that is easy to break in initial writing, a ballpoint pen in which various fillers are mixed in the ink, and the handwriting written on the paper surface is rubbed with an eraser. A ballpoint pen filled with ink that can be easily erased, a ballpoint pen that can be corrected by concealing misprints with white ink, etc. This makes it possible to provide a knock-type ballpoint pen that can be written with assistance.

1 to 4 show an embodiment of the present invention.
First of all, the ballpoint pen refill used in the present invention is a ballpoint pen that uses ink that easily breaks off ink during initial writing, a ballpoint pen that contains various fillers in the ink, and the handwriting written on paper is easily erased by rubbing with an eraser. Ballpoint pen refills that can be written with the aid of pressure, such as ballpoint pens that can be filled with ink, low-viscosity water-based, oil-based ballpoint pens, ink ballpoint pens with shear thinning viscosity, oil-based ballpoint pens for high-viscosity inks Various ballpoint pens are applied.

  Also, for ballpoint pen refills, it is important to take measures against drying resistance at the tip of the tip, prevention of direct current of ink and backflow, depending on the ink specifications and the thickness of the ink containing tube. Ink that is easy to dry and low-viscosity ink must have a means of bringing the tip ball into close contact with the inner edge of the ball holding part of the chip in order to prevent drying resistance and direct current of the ink. Followers for prevention and backflow prevention are required. Further, when the ink containing portion is thick, a valve mechanism for preventing the backflow of ink is required between the rear end of the chip and the ink containing portion. Further, a follower is necessary for preventing ink from adhering to the valve mechanism or knock mechanism when the ink requires a pressurizing mechanism and the ink flows backward.

  As shown in FIG. 1, a knock mechanism portion is disposed behind the shaft cylinder 1, and the writing rod tip of the ballpoint pen refill 9 is moved back and forth by moving the knock bar 3 protruding from the rear end hole of the shaft cylinder 1. It can be projected and retracted from a front end hole 2a of a mouth end portion 2 which is detachably fixed to one end.

FIG. 2 shows an enlarged sectional view of the structure which is the gist of the present invention.
A step portion 1f is formed at the substantially rear end of the inner hole portion of the shaft tube 1, and a cam tube portion 1a in which cam rib portions 1b and cam groove portions 1c are alternately formed radially is formed on the front inner wall thereof. In the cam groove portion 1c, deep cam grooves and shallow cam grooves are alternately formed in the radial direction, and inclined surfaces are formed toward the tip ends of the ribs and the shallow cam grooves. In the embodiment, the cam tube portion 1a is integrally formed on the inner wall of the shaft tube 1, but it can be provided separately and fixed inside the shaft tube. (The structure of the cam cylinder is well known and will not be described in detail.)

  The knock bar 3 has a cylindrical shape with the rear end closed, and a rib 3a is formed at a required position on the outer periphery of the front portion. The rib 3a is inserted into the cam groove portion 1c of the cam cylinder portion 1a. A cam portion 3b that mates with the cam portion 4b is formed. In the embodiment, the cam portion 3a and the rib 3b are separately formed. However, it can of course be formed as an integral cam portion.

The rotor 4 has a cylindrical shape with the rear end closed, and the rear end shaft portion 4e is loosely fitted in the opening hole of the knock bar 3, and the cam groove portion of the cam tube portion 1a is formed at a required position substantially on the outer periphery of the center portion. A rib-shaped cam portion 4b corresponding to the assigned position 1c and having an inclined protrusion at the tip thereof, and a mountain-shaped cam portion are formed between the cam portions 4b. The cam portion 74b and the mountain-shaped cam portion can also be formed as an integral cam portion corresponding to the integral cam portion of the knock bar.
The structure of the knock mechanism portion indicated by the cam cylinder portion, the knock bar, and the rotor described above is well known and will not be described in detail. The other knock mechanism portions have various forms and are well known.
Furthermore, a shaft portion 4c is formed at the front end of the rotor 4, a circumferential concave groove 4d is provided on the outer periphery of the substantially front end portion of the shaft portion 4c, and a seal made of an elastic body such as rubber is provided in the concave groove 4d. A ring 5 is fitted.

  As described above, the knock bar 3 having the rib 3a that mates with the cam groove 1c and the rotor 4 having the rib 4a are inserted into the cam cylinder portion 1a so as to be capable of axial transition.

In addition, a cylinder 6 is fixed to the inner hole portion of the shaft cylinder 1 in front of the rotor 4.
The cylindrical body 6 is provided with a widened portion 6b at the rear end of the inner hole portion, a circumferential convex portion 6a is formed in front of the inner hole portion, and an outer peripheral portion 6c at the substantially rear end with respect to the front outer peripheral portion. It is slightly larger.
Two convex locking portions 1d and 1e are provided on the inner hole wall of the shaft tube 1, and the outer peripheral portion 6c of the cylindrical body 6 is elastically engaged between the locking portions 1d and 1e. Thus, the cylinder 6 is fixed to the shaft cylinder 1.
In addition, the fixing means of the cylinder 6 and the shaft cylinder 1 can be provided without being limited to this means.

Further, the seal body 7 is a cylindrical body made of an elastic body such as rubber, and a circumferential concave groove 7c is formed on the outer peripheral portion, and the seal portions 7a and 7b having circumferential convex portions on the inner peripheral portion. Is formed. In addition, a seal part is not limited to two places, One place or more may be sufficient.
The seal body 7 is fixed in an airtight manner by elastically fitting the circumferential convex portion 6a of the cylindrical body 6 into the circumferential concave groove 7c. The fixing means is not limited to this means.

The mounting cylinder 8 is pipe-shaped and penetrates the inner peripheral portion of the seal body 7 so that the rear portion is inserted into the opening hole of the rotor 4. In a state where the ring-shaped seal plug 10 is fixed, the pipe-shaped rear end is brought into contact with the rear end of the opening hole of the rotor 4 and is fixed to the rotor 4, and the pipe-shaped front portion is the front of the rotor 4 front end. The tapered opening 8a is positioned in front of the seal body 7. An air passage 12 is formed on the peripheral surface of the opening hole of the rotor 4 so as to extend from the rear end of the seal plug 10 to the front end of the rotor 4 along the outer surface of the insertion tube 8.
In addition, the ball-point pen refill 9 is inserted into the pipe-shaped inner hole of the mounting cylinder 8, but the ball-point pen re-fill 9 is detachably engaged with the outer periphery of the ball-point pen re-fill 9 so that the ball-point pen refill 9 does not fall off. A protrusion or the like is provided if necessary.

  In the embodiment, a crimp 9b is formed in the ink containing tube of the ballpoint pen refill 9, and the inner step portion 2b of the tip portion 2 is attached to the front end of the crimp and the front end of the shaft tube 1 by means of screwing or the like. In the meantime, the return spring 11 is laid, and the mounting cylinder 8, the rotor 4, and the knock bar 3 are urged to the rear side of the shaft cylinder 1. In the case where the ballpoint pen refill is provided so as to be engaged with the inner hole of the mounting cylinder, a return spring can be laid between the inner step portion of the tip and the mounting cylinder. In that case, it is not necessary to provide a step part such as a crimp on the ballpoint pen refill.

(Function)
The operation based on the above embodiment will be described below. First, when the rear end of the knock bar 3, which is a knock part, is knocked and the knock bar 3 is advanced, the rotor 4 is rotated and positioned at the forward position, and the tip 9 a of the ballpoint pen refill 9 is moved to the front end hole of the tip 2. It protrudes from 2a and becomes a writing state. At that time, the seal ring 5 provided substantially at the outer periphery of the front end of the rotor 4 moves forward in close contact with the inner periphery of the cylindrical body 6, and the inner peripheral surface of the seal body 7 is moved to the outer peripheral surface of the insertion cylinder 8. Since the space portion 13 between the seal body 7 and the rotor 4 is reduced, the internal pressure is increased and the ball pen refill is passed through the air passage 12 leading to the rear end hole of the ink containing tube. The end hole is pressurized. By the pressurization, the ink does not tend to flow backward even when writing upward, and ink shortage is prevented. In addition, it prevents the ink from separating from the peripheral surface of the tip ball due to a drop impact, poor ink fluidity, and the like, and prevents the continuous outflow of ink, and recovers when the ink breaks. (See Figs. 3 and 4)

  When knocking again from this state, the rotor 4 is rotated to the retracted position, and the tip of the tip 9a is immersed in the front end hole 2a. At this time, since the ballpoint pen refill 9 and the rotor 4 are integrally held via the mounting cylinder 8, the writing tip of the ballpoint pen refill 9 protrudes and immerses while rotating together with the rotor 4. In the state where the writing tip of the ballpoint pen refill 9 is immersed, the seal ring 5 is located in the expanded portion 6b of the cylindrical body 6, and the space 13 can be in a state of communicating with the outside air. it can.

(Other embodiments)
In the embodiment described above, the mounting cylinder and the rotor can be provided integrally. In that case, a seal portion that is in airtight contact with the ink storage tube of the ballpoint pen refill is formed in the inner hole portion of the mounting cylinder, and further, the rotor is disposed behind the seal portion and behind the seal portion of the seal body. A vent hole may be formed on the side surface of the mounting cylinder at a position in front of the front end. (Not shown)
As the seal plug 10, the seal ring 5, and the seal body 7, in addition to an elastic body such as rubber, a soft synthetic resin molded product or the like can be used. Further, if necessary, the seal ring 5 is mixed or coated with a lubricant in the seal ring and / or the cylinder body in order to reduce the sliding resistance with the cylinder body 6. It is effective to mix or apply the lubricant to the seal body 7 as well.
Further, the cylinder 6 can be provided integrally with the shaft cylinder 1 or fixed to the shaft cylinder as a separate body. Furthermore, the cylindrical body 6 can be attached to the shaft body 1 so as to be rotatable. Since the rotor 4 moves back and forth while rotating by the knocking operation, a frictional resistance acts between the seal ring and the cylinder, and between the mounting cylinder and the seal portion of the seal body in the rotation direction. At that time, the cylindrical body is rotated together with the rotor by attaching the cylindrical body to the shaft cylinder so that the rotor rotates even if the return spring for biasing the rotor backward is weak. Is not disturbed. (If the spring is too strong, there will be no problem with the rotation of the rotor, but the impact on writing performance due to impact and the feel of knocking will be worse.)

It is the longitudinal cross-sectional view which shows the whole knock type ball-point pen which is an Example, and has shown the state by which the writing front-end | tip part of the ball-point pen refill was accommodated in the front-end | tip part. It is the figure which expanded and showed the structure part which is the summary of this invention corresponding to the state of FIG. It is the longitudinal cross-sectional view which shows the whole knock type ball-point pen which is an Example, and has shown the state which the writing front-end | tip part of the ball-point pen refill protruded from the front-end hole of the front-end | tip part. It is the figure which expanded and showed the structure part which is the summary of this invention corresponding to the state of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft cylinder 1a Cam cylinder part 1b Cam rib part 1c Cam groove part 1d Engagement part 1e Engagement part 1f Step part 2 Portion part 2a Front end hole 2b Inner part 3 Knock stick 3a Rib 3b Cam part 4 Rotor 4a Rib 4b Cam part 4c shaft portion 4d concave groove 4e rear end shaft portion 5 seal ring 6 cylindrical body 6a convex portion 6b widened portion 6c outer peripheral portion 7 seal body 7a seal portion 7b seal portion 7c concave groove 8 mounting cylinder 9 ball pen refill 9a tip 9c crimp 9c Step part 10 Seal plug 11 Return spring 12 Ventilation path 13 Space part

Claims (4)

The tip of the ballpoint pen and the ink storage tube at the back are equipped with a ballpoint pen refill that is filled with ink, and the ballpoint penfill is mounted so that the writing tip can be projected and retracted from the front end hole in front of the shaft cylinder. In the knock-type ballpoint pen,
By moving the knock part protruding from the rear end of the shaft cylinder back and forth, the locking body interlocking with it is locked at the front retracted position inside the shaft cylinder, and the shaft cylinder inner surface or A seal ring that is in close contact with the inner surface of the cylinder provided in the shaft cylinder is provided, and a mounting cylinder is provided that extends forward from the front end of the locking body,
In addition, a seal body having a protruding seal portion in the inner hole is fixed in front of the front end of the locking body, and is fixed in the cylinder provided in the shaft cylinder or in the shaft cylinder. Then, the cylindrical body provided in the shaft cylinder or the shaft cylinder before and after the seal portion is divided in an airtight manner,
Also, the rear end of the ink storage tube and the front end of the locking body are provided so as to allow ventilation, and the ink storage tube of the ballpoint pen refill is fitted into the mounting cylinder, and the ballpoint pen refill, the mounting cylinder and the locking body are returned. The space formed between the rear end of the sealing body and the front end of the locking body is reduced when the spring is biased to the rear of the shaft cylinder and the locking body is locked at the forward position by knocking the knocking portion. A knock type ballpoint pen configured to pressurize the rear end of the ink of the ballpoint pen refill.   A knock rod and a rotor having a cam portion and a rib are fitted and inserted in a cam tube portion provided in the shaft tube so as to be capable of axial transition, and provided on the outer periphery of the shaft portion in front of the rotor on the inner surface of the shaft tube or in the shaft tube. The knock type ball-point pen according to claim 1, wherein a seal ring is provided in close contact with the inner surface of the cylindrical portion.   The knock type ball-point pen according to claim 1, wherein a cylindrical body is provided in the shaft cylinder, and the cylindrical body is provided so as to be rotatable only with respect to the shaft cylinder. The knock type ball-point pen according to claim 1, wherein a mounting cylinder is provided separately on an axis of the locking body.

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