JP2005288794A - Push-action ballpoint pen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a push-action ballpoint pen which makes pressurization prevent discharge of ink from being stopped in the state of upward directed writing, and which enables writing by having the discharge of the ink, apt to stop in initial writing, supported by the pressurization. <P>SOLUTION: An interlocked locking body can be locked to an advance/retreat position inside a barrel by pushing; ahead of a front end of the locking body, a protrusive seal part is provided in a tubular inner hole part almost at a front end; a seal body, wherein an expandable/contractible deformation part is provided in the rear of it and wherein an abutting part is formed at a back end, is fixed to the inside of the barrel; an ink storage pipe passes through the seal part of the seal body so as to be fitted into the inner hole of the locking body; the seal part is brought into close contact with an outer periphery of the ink storage pipe, so that the inside of the barrel and that of the seal body can be airtightly divided from each other before and behind the seal part; a back end of the ink storage pipe and the front end are provided in a ventilated state; the locking body is urged in the backward direction of the barrel by a return spring; and a space part in the deformation body of the seal body is reduced at pushing, so that a back end of the ink can be pressurized. <P>COPYRIGHT: (C)2006,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 comprises a ballpoint pen tip at the front end and an ink storage tube at the rear, a ballpoint pen refill in which the ink storage tube is filled with ink, and a ballpoint pen refill mounted with the ballpoint pen refill. 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 moves forward in the shaft cylinder. The retractable position can be locked, and the front end of the locking body is provided with a telescopic tubular deformable portion and a front portion in which a seal ring is provided in the inner hole portion so as to be movable forward and backward. A seal body is provided, and the front portion is fixed to the shaft tube or a tube body provided in the shaft tube, so that the ink storage tube of the ballpoint pen refill is connected to the seal ring of the front portion. The seal portion formed in the hole passes through and is fitted into the inner hole portion of the locking body, and the seal portion is in close contact with the outer periphery of the ink storage tube, and the inside of the shaft cylinder and the seal body are hermetically sealed before and after the seal portion. In addition, the rear end of the ink containing tube and the front end of the locking body are provided to vent, and the ballpoint pen refill and the locking body are urged to the rear of the shaft tube by the return spring to When the locking body is knocked and moved forward, the seal ring approaches the front end side in the recess, and the front and rear portions of the outer periphery of the seal ring cannot be vented, and the locking body moves forward and the space in the deformed portion is reduced. As a result, the locking body is locked at the forward position while the ink rear end of the ballpoint pen refill is pressurized, and when the locking body is retracted, the seal ring approaches the rear end side of the recess and Front and rear parts communicated Next, the locking member is retractable in a state that the ink rear end communicating with the outside air.

  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 seal ring is disposed in the inner hole portion of the front portion so as to be movable back and forth, and the front portion rearward. A seal body having a deformable portion that can be expanded and contracted and a contact portion formed at the rear end thereof is fixed to the inside of the shaft tube or the tube body provided in the shaft tube, and the knocking portion is knocked to When the seal ring moves forward, the front and rear parts of the outer periphery of the seal ring become impervious to the front end side of the recess, and the locking body is moved from the state where the rear end of the sealing body and the front end of the locking body are in airtight contact. Further, the space portion in the deformable portion is further reduced to be reduced.

  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 knock bar and a locking body having a cam portion and a rib in a cam barrel portion provided in the shaft barrel. The rotor which is is inserted so that axial movement is possible.

  A knock type ballpoint pen according to a fourth aspect of the present invention is the knock type ballpoint pen according to the first aspect, wherein a circumferential concave portion is formed on the inner surface of the front portion, and from the bottom surface of the concave portion to the rear end side. A communicating ventilation groove is formed, and the seal ring is inserted into the recess so as to slide back and forth, and the seal ring is moved forward by the friction between the ink storage tube and the seal when the locking body is moved forward. The front and rear parts of the outer periphery of the seal ring are not allowed to vent toward the side, the rear end of the ink is pressurized by further advancement, and the seal ring approaches the rear end of the recess when the locking body is retracted, and the outer periphery of the seal ring The front and rear portions are in communication with each other through the ventilation groove, and the locking member can be retracted with the ink rear end in communication with the outside air.

  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 and 2 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 tube 1, and the writing tip portion of the ball pen refill 9 is moved back and forth by moving the knock portion protruding from the rear end hole of the shaft tube 1. It can be projected and retracted from the front end hole 2a of the tip 2 that is detachably fixed to the front.

  First, a step portion 1 b is formed in the rear side inner hole of the shaft tube 1, and the cylinder body 8 is mounted in a state where the rear end is in contact with the step portion, and a seal body is attached to the inner hole portion of the cylinder body 8. The front part of 7 is mounted. Further, a small window portion 1a is formed in the side surface of the shaft tube 1 behind the step portion 1b.

The seal body 7 is a cylindrical body made of an elastic body such as rubber. The seal body 7 has a projecting seal portion 7a at a required position of the inner hole portion of the front portion 7d, and is further provided with a deformable portion 7b that can be expanded and contracted behind the front portion 7d. A contact portion 7c is formed at the rear end. In addition, the deformation | transformation part 7b is formed in the shape which can be expanded-contracted, such as a bellows shape or a thin shape.
As shown in FIG. 2, a seal ring 7a is disposed in the inner hole portion of the front portion 7d so as to be able to move back and forth, and a deformable portion 7b that can expand and contract at the rear of the front portion and a contact portion 7c at the rear end thereof. The seal body 7 is fixed to the cylinder body 8 provided in the shaft cylinder 1 at the front portion thereof (it can also be provided directly in the shaft cylinder), and the ink storage tube of the ballpoint pen refill 9 serves as the seal body 7. The protrusion 7g formed in the inner hole of the seal ring 7a is inserted into the inner hole of the rotor 4 (locking body), and the seal 7g is in close contact with the outer periphery of the ink containing tube. Thus, the inside of the shaft tube and the sealed body can be separated in an airtight manner before and after the seal portion, and the ball pen refill 9 and the rotor 4 are provided so that the rear end of the ink containing tube and the front end of the rotor 4 are ventilated. Is urged to the rear of the barrel 1 by the return spring 10 When the knock portion 5 is knocked and the rotor 4 is advanced, the seal ring 7a approaches the front end side in the recess 7e, the front end side of the ventilation groove 7f is closed by the seal ring 7a, and the front and rear portions of the outer periphery of the seal ring are Ventilation is disabled, and the rotor 4 further advances from a state where the rear end of the seal body 7 and the front end of the rotor 4 are in an airtight state, and the space 12 in the deformed portion 7b is reduced. The rotor 4 is locked at the forward movement position with the ink rear end of the ballpoint pen refill 9 being pressurized, and when the rotor 4 is retracted, the seal ring 7a approaches the rear end side of the recess 7e and the ventilation groove 7f The front end side is opened, the front and rear portions of the outer periphery of the seal ring are in communication with each other through the ventilation groove 7f, and the rotor 4 can be retracted with the ink rear end in communication with the outside air.

  Further, a step portion 6d is formed at the substantially rear end of the inner hole portion of the cam cylinder 6, and cam rib portions 6b and cam groove portions 6c are alternately formed radially on the front inner wall thereof. In the cam groove portion 6c, 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. Further, a projecting locking portion 6 a is formed on the side surface of the cam cylinder 6. (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 6c of the cam tube 6, and a mountain-shaped cam of the rotor 4 is formed at the tip. A cam portion 3b that mates with the portion 4b is formed. In the embodiment, the cam portion 3b and the rib 3a are separately formed. However, it can be formed as an integral cam portion. In the embodiment, a cap-shaped knock portion 5 is fitted to the rear end of the knock bar 3.

The rotor 4 (locking body) is also a cylinder 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 cylinder is placed at a required location on the substantially outer periphery of the center portion. A cam portion 4b having a rib-like shape corresponding to the assigned position of the cam groove portion 6c and having an inclined protrusion at the tip thereof, and a mountain-shaped cam portion formed between the cam portions 4b. The cam portion 4b 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.

  As described above, the knock rod 3 having the rib 3a that mates with the cam groove portion 6c and the rotor 4 having the rib 4a are fitted and inserted in the cam barrel 6 so as to be capable of axial transition. 1, a locking portion 6a formed on the side surface of the cam cylinder 6 is elastically fitted and fixed to a small window portion 1a formed on the side surface of the shaft cylinder 1. At that time, the front end of the cam cylinder 6 substantially contacts the rear end of the front portion 7d of the seal body 7, and the seal body 7 is positioned and fixed in the shaft cylinder.

The ball-point pen refill 9 penetrates the ink containing tube through the inner peripheral portion of the seal portion 7 a of the sealing body 7, the rear portion thereof is inserted into the opening hole of the rotor 4, and the rear end of the ink containing tube is the rotor 4. The abutting step 4d provided at the rear of the opening hole is positioned so as to abut. Further, a protrusion or the like that is detachably engaged with the outer periphery of the ink storage tube is provided on the inner hole wall of the rotor 4 as necessary.
The contact step 4d is formed with a convex portion at a required location, and is formed with an air passage 11 that passes from the rear end of the ink containing tube to the front end of the rotor 4.
In the above-described embodiment, the ink containing tube passes through the seal portion and is attached to the rotor. However, in the knock type ballpoint pen according to claim 1, the mounting cylinder passes through the seal portion and serves as the rotor. It also includes the case where the ballpoint pen refill is provided so as to be fixed and provided in the inner hole portion of the mounting cylinder.

  In the embodiment, a crimp 9b is formed in the ink containing tube of the ballpoint pen refill 9, and the inner stage of the tip part 2 attached to the front end step part 9c of the crimp and the front end of the shaft cylinder 1 by means such as screwing. A return spring 10 is laid between the portion 2 b and the rotor 4 and the knock bar 3 are urged toward the rear side of the shaft tube 1.

(Function)
The operation based on the above embodiment will be described below. First, when the knock end 5 is knocked and the knock bar 3 is advanced, the rotor 4 is rotated and positioned at the advance position, and the tip 9a of the ball pen refill 9 projects from the front end hole 2a of the tip 2. Written state.
At that time, the seal ring 7a approaches the front end side in the recess 7e so that the front and rear portions of the outer periphery of the seal ring cannot be ventilated, and the inner surface of the front end portion 4c of the rotor 4 is in close contact with the contact portion 7c of the rear end of the seal body 7 Then, since the inner peripheral surface of the seal portion 7a of the seal body 7 advances in a state where the outer peripheral surface of the ink containing tube of the ballpoint pen refill 9 is in close contact, the space portion 12 of the deformable portion 7b of the seal body 7 is reduced. The rear end hole of the ball-point pen refill is pressurized through the air passage 11 leading to the rear end hole of the ink containing tube. 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.

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 of the tip portion. At this time, since the ball-point pen refill 9 and the rotor 4 are held so as to be integrated, the writing tip portion of the ball-point pen refill 9 protrudes and immerses with the rotor 4 repeatedly.
In the state where the writing tip portion of the ball-point pen refill 9 is immersed, the seal ring 7a approaches the rear end side of the recess 7e, the front end side of the ventilation groove 7f is opened, and the front and rear portions of the outer periphery of the seal ring are the ventilation groove 7f. Thus, the rotor 4 can be retracted with the rear end of the ink communicating with the outside air. The rear end of the contact portion 7c of the seal body can be opened to communicate with the outside air.

(Other embodiments)
As the seal body 7, an elastic body such as silicone rubber or other rubber, a soft synthetic resin molded article, or the like is usually used. Further, if necessary, it is effective to mix or apply a lubricant to the seal body 7 in order to reduce sliding resistance with the ink storage tube of the ballpoint pen refill. Alternatively, the seal body 7 can be made of two parts, and the front portion of the deformable portion 7b can be fixed to the rear portion of the front portion 7d, or can be fixed only rotatably.
Moreover, the sealing body 7 can also be directly fixed to the inner surface of the shaft tube 1, and its means is not limited. Furthermore, the mounting structure of the cam cylinder is not limited to the structure of the embodiment.
In addition, the seal body is provided with a rear end integrally with the front end of the locking body, separates the front end of the deformable portion and the front portion, and serves as a contact portion when the locking body is advanced and pressurized. You can also
Still further, the sealing body can be provided so that the rear end thereof is provided integrally with the front end of the locking body, and the front portion thereof is rotatably provided in the shaft tube or the tube body provided in the shaft tube. (To reduce the frictional resistance that the locking body receives in the rotation direction when the locking body rotates)

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 Small window part 1b Step part 2 Mouth part 2a Front end hole 2b Inner step part 3 Knock stick 3a Rib 3b Cam part 4 Rotor (locking body)
4a rib 4b cam part 4c front end part 4d contact step part 4e rear end shaft part 5 knock part 6 cam cylinder 6a locking part 6b cam rib part 6c cam groove part 6d step part 6e protrusion 7 seal body 7a seal ring 7b deformation part 7c Abutting part 7d Front part 7e Concave part 7f Venting groove 7g Sealing part 8 Tube 9 Ball pen refill 9a Tip 9b Crimp 9c Step part 10 Return spring 11 Ventilation path 12 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 interlocking body interlocking with it can be locked at the front retracted position inside the shaft cylinder, and a telescopic cylinder is provided at the front end of the locking body. And a seal body configured by disposing a forward portion in which a seal ring is provided in the inner hole portion so that the seal ring can be moved back and forth is provided at the front, and is provided in the shaft tube or in the shaft tube. The front portion is fixed to the cylindrical body, and the ink storage tube of the ballpoint pen refill penetrates the seal portion formed in the inner hole of the seal ring of the front portion and is fitted into the inner hole portion of the locking body. The seal portion is in close contact with the outer periphery of the ink storage tube so that the inside of the shaft tube and the sealed body can be separated 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 member are vented. The ballpoint pen refill and the locking body The spring is biased to the rear of the shaft cylinder, and when the knocking part is knocked and the locking body is advanced, the seal ring approaches the front end side in the recess and the front and rear parts of the outer periphery of the sealing ring cannot be vented. As a result of the forward movement, the space in the deformed portion is reduced, so that the locking body is locked at the forward position with the ink rear end of the ballpoint pen refill being pressurized, and the seal is sealed when the locking body is retracted. The ring is close to the rear end side of the recess, and the front and rear portions of the outer periphery of the seal ring are in communication with each other, and the locking body can be retracted with the ink rear end in communication with outside air. Knock-type ballpoint pen.   A seal ring is disposed in the inner hole of the front part so as to be movable back and forth, and a deformable part that can be expanded and contracted at the rear of the front part and a contact part formed at the rear end thereof are provided in the shaft cylinder or the shaft cylinder. It is fixed to the cylinder provided inside, and when the knocking part is knocked and the locking body is advanced, the seal ring approaches the front end side in the recess and the front and rear parts of the outer periphery of the seal ring cannot be vented. 2. The structure according to claim 1, wherein the locking body further advances from a state in which the rear end of the rear end and the front end of the locking body abut on each other in an airtight manner, and the space portion in the deformed portion is reduced. The knock-type ballpoint pen described in 1.   The knock type ball-point pen according to claim 1, wherein a knock rod having a cam portion and a rib and a rotor as a locking member are inserted into a cam tube portion provided on the shaft tube so as to be capable of axial movement. A circumferential concave portion is formed on the inner surface of the front portion, a ventilation groove communicating from the bottom surface of the concave portion to the rear end side is formed, and the seal ring is inserted into the concave portion so as to slide back and forth, and locked. When the body is moved forward, the seal ring approaches the front end side in the recess due to friction between the ink containing tube and the seal portion, and the front and rear portions of the outer periphery of the seal ring cannot be vented. In addition, when the locking body is retracted, the seal ring approaches the rear end side of the recess, and the front and rear parts of the outer periphery of the seal ring are in communication with the ventilation groove, and the locking body can be retracted with the ink rear end in communication with the outside air The knock-type ballpoint pen according to claim 1.

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