JP2009154380A - Ball point pen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the ability of a pen refill unit to be loaded when replaced without deteriorating the sealing performance of the open rear end of an ink storage pipe. <P>SOLUTION: A holder member 8 for the ink storage pipe 6 is composed of first, second, and third holder members 23, 24, and 25. The respective rear ends 23a, 24a, and 25a of the holder members are made smaller in diameter than their front end ends 23b, 24b, and 25b. The front end of the second holder member is fitted on the rear end of the first holder. The open rear end 6b of the ink storage pipe is inserted into the rear ends of the first and second holder members from the front. Thereby the ink storage pipe is held so as to be detachable. The front end and rear end of the third holder are fitted on the front end and rear end of the third holder from rear. A rear face plate 26 having a through-hole 27 communicating with the opening 6c of the open rear end of the ink storage pipe is disposed at the rear end of the third holder member. A pressure pump mechanism 16 is connected to a rear part of the third holder member. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a ballpoint pen, and in particular, has a pen refill unit composed of an ink containing tube provided with a pen tip at the front end, and a pressure pump mechanism for pressurizing ink in the ink containing tube by a knock operation during use. It relates to the provided ballpoint pen.

  In the conventional ballpoint pen, the rear end of the opening of the ink storage tube in the pen refill unit is inserted into the holder member made of a seal body and is detachably loaded in the main body barrel, A pressurizing pump mechanism in which a pressurizing chamber is formed by a piston, a cylinder, and a holder member, interlocking with a knocking operation of a knock mechanism provided at the rear end portion of the main body cylinder, is provided. There is known one in which the inside of the rear end of the opening of the housing tube is pressurized (see Patent Document 1).

However, in the ballpoint pen described in Patent Document 1, the outer peripheral surface of the annular elastic ring and the holder member at the tip of the piston is in close contact with the inner peripheral surface of the cylinder, and is shut off from the outside air. By moving the piston forward, the air in the pressurizing chamber in the cylinder is pressurized, the pressurized air is introduced into the rear end of the opening of the ink containing tube, and the ink filled in the ink containing tube is discharged. Although it can be pressurized, when manufacturing each member of the annular elastic ring and holder member, the dimensional accuracy of each member decreases due to variations in outer diameter, flashes at the joint of the mold, etc. However, there is a possibility that the sealing performance of the pressurizing chamber is impaired.
In order to improve the sealing performance between each of these members, particularly the holder member and the ink storage tube, the holding force of both must be strengthened, so that the ink storage tube is attached to the holder member when the pen filling unit is replaced. There was a problem that the loadability at the time of holding the rear end portion of the opening deteriorated.
JP 2005-280119 A

  In view of the above-described situation, the present invention provides a ballpoint pen that can improve the loadability of the pen refill unit at the time of replacement without impairing the sealing performance of the rear end portion of the ink containing tube. It is an object.

As described in each claim in “Claims”, the above-described problem is solved by the invention having the following configuration.
(1) A holder member disposed in the main body barrel is fitted with an opening rear end of an ink storage tube provided with a pen tip at the front end from the front to hold the ink storage tube detachably. In a ballpoint pen provided with a pressure pump mechanism that pressurizes the inside of the opening rear end of the ink containing tube in conjunction with the knocking operation of the knock mechanism provided at the rear end of the main body barrel at the rear of the holder member. Each of the rear end portions includes a first holder member, a second holder member, and a third holder member made of a tubular body whose diameter is smaller than that of the front end portion, and the rear end portion whose diameter is reduced in the first holder member. The front end portion of the second holder member is externally fitted, and the rear end portion of the opening of the ink storage tube is fitted from the front in the rear end portions of the first holder member and the second holder member, which are reduced in diameter. Holding tube is detachable In addition, the front end portion and the rear end portion of the third holder member are externally fitted from the rear to the front end portion and the rear end portion of the second holder member, respectively, and the rear end of the third holder member is opened after the ink containing tube is opened. A rear plate having a through hole communicating with the opening in the end portion is provided, and a pressurizing pump mechanism is continuously provided behind the third holder member.

(2) In the above item (1), the inner and outer peripheral surfaces of the rear end portion of the second holder member having a reduced diameter are respectively arranged on the outer peripheral surface of the opening rear end portion of the ink containing tube and the rear end portion of the third holder member. An annular protrusion is formed in close contact with the inner peripheral surface of the.

(3) In the item (1) or (2), an annular protrusion that is in close contact with the outer peripheral surface of the ink containing tube is formed on the inner peripheral surface of the reduced diameter rear end of the first holder member.

(4) In any one of the above items (1) to (3), the pressurizing pump mechanism includes a pressurizing member made of an elastic cylinder forming a pressurizing chamber therein, and a cam mechanism for knocking operation of the knocking mechanism. The connecting member is externally fitted to the rear end portion of the third holder member whose diameter is reduced, and the connecting tube member allows the front end flange portion of the elastic cylindrical body in the pressurizing member to be formed. The airtightness between the third holder member and the pressurizing chamber in the pressurizing member is kept close to the rear plate of the third holder member.

According to the present invention, the following effects can be obtained.
According to the first aspect of the present invention, between the outer peripheral surface of the second holder member and the inner peripheral surface of the third holder member, and the outer peripheral surface of the rear end portion of the opening in the ink containing tube and the inner periphery of the second holder member. It is possible to effectively seal the gap between the surfaces, and the inside of the opening rear end portion of the ink storage tube can be efficiently pressurized, so that the sealing performance of the rear end portion of the ink storage tube is not impaired.
In addition, since the rear end of the opening of the ink storage tube is fitted only in the outer peripheral surface of the first holder member and the rear end of the second holder member whose diameter is reduced, the pen refill unit can be easily loaded during replacement. Can be improved.

  According to the second aspect of the present invention, the formation of the annular protrusion can further enhance the sealing performance between the second holder member and the third holder member, and the ink storage tube and the third holder member, and the ink. Since the contact area on the seal surface between the outer peripheral surface of the rear end of the opening in the receiving tube and the inner peripheral surface of the second holder member is reduced by the contact of each annular protrusion, the ink in the pen refill unit The opening rear end of the storage tube can be easily inserted and held, and the holding force between the ink storage tube and the holder member can be easily adjusted by changing the cross-sectional shape of each annular projection. .

  According to the third aspect of the present invention, the sealing performance between the ink containing tube and the first holder member can be improved, and the contact area between the seal surfaces can be reduced, so that the first holder member can be reduced. Since the holding resistance at the rear end of the opening in the ink storage tube can be reduced, the pen refill unit can be easily loaded.

  According to the fourth aspect of the present invention, it is possible to effectively maintain the airtightness in the pressurizing chamber in the pressurizing member communicating with the rear end of the opening of the ink containing tube.

Hereinafter, the present invention will be described in detail by taking a knock-type ballpoint pen as an example.
FIG. 1 is a cross-sectional view of a ballpoint pen in a non-pressurized state showing an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of the main part in the vicinity of a holder member in part A of FIG. 1, and FIG. It is a principal part expanded sectional view.
In the drawing, “left side” is “front” and “right side” is “back” with respect to the page.

  As shown in FIG. 1, the ballpoint pen 1 of the present invention includes a main body barrel 2 and a pen tip member 3 screwed to the front end portion 2 a of the main body barrel 2. The pen refill unit 4 is loaded.

The pen refill unit 4 includes an ink storage tube 6 filled with ink 5 serving as a writing medium, and a pen tip 7 attached to the front end 6a of the ink storage tube 6.

  The pen tip 7 is adapted to protrude and retract from the front end opening 3a of the pen tip member 3 by pushing the pen refill unit 4 forward in the axial direction by a knock operation of the knock mechanism 10 described later.

The opening rear end 6b of the ink containing tube 6 is held by being fitted into the holder member 8 that is movably disposed in the axial direction of the main shaft 2 from the front. 2 is detachably loaded.
The holder member 8 is urged backward by a compression spring 9 so that the pen tip 7 of the pen refill unit 4 can be stored in the pen tip member 3.

  A knock mechanism 10 is incorporated in the rear end portion 2b of the main body shaft cylinder 2. The knock mechanism 10 can project the knock portion 11 and the knock portion 11 from the rear end portion 2b of the main body shaft cylinder 2 to the outside. In this manner, the compression spring 12 is urged rearward, the knocking portion 11 is pushed against the urging force of the compression spring 12, and the knocking rod 13 cooperates with the opening operation. And a rotor 15 that cooperates with the cam mechanism portion 14.

The spring force of the compression spring 12 is set smaller than the spring force of the compression spring 9 that biases the holder member 8.
That is, the knock mechanism 10 causes the knock bar 13 to be pushed against the urging force of the compression spring 12 by the knocking operation of the knock part 11 and to release the rotor, so that the cam mechanism 14 causes the rotor to move. 15 is a well-known mechanism that can drive the pen tip 7 of the pen refill unit 4 in a retracted state or a protruding state.

  Between the opening rear end 6b of the ink containing tube 6 and the front end 15a of the rotor 15 at the rear of the holder member 8 is interlocked with the knocking operation of the knock mechanism 10 provided at the rear end 2b of the main body cylinder 2. A pressurizing pump mechanism 16 that pressurizes the inside of the opening 6c at the opening rear end 6b of the ink containing tube 6 is continuously provided.

  As shown in FIG. 2, the pressurizing pump mechanism 16 includes a pressing member 17 that interlocks so as to follow the driving of the rotor 15 in the cam mechanism 14, a front end portion of the pressing member 17, and the ink containing tube 6. It is comprised by the pressurization member 18 provided between the opening rear-end parts 6b.

  The pressure member 18 is formed of an elastic cylindrical body made of an elastomer such as rubber, and the holder member 8 that holds the front end flange portion 19a of the pressure member 18 and the rear end portion 6b of the ink containing tube 6 is held. The rear end surface 19b of the ink containing tube 6 is connected to the front end of the pressing member 17 so as to communicate with the outside air. is there.

  The pressurizing member 18 moves in the axial direction of the front and rear in the pressurizing chamber 20 formed inside the pressurizing member 18 by a pressing operation accompanying the forward movement of the pressing member 17 by the knocking operation of the knock mechanism 10. It can be stretched and deformed.

  A plug body 21 protrudes forward from the center of the front end of the pressing member 17, and the plug body 21 is formed by compressing deformation of the pressure member 18 and has a rear end mouth portion 22 of the pressure member 18. The inside of the pressurizing chamber 20 can be maintained in an airtight state.

  The holder member 8 includes a first holder member 23, a second holder member 24, and a third holder member 25 made of a tubular body, and the rear end portions 23a, 24a, and 25a are respectively connected to the front end portions 23b and 24b. , 25b.

  The rear end portion 23a of the first holder member 23 having a reduced diameter is fitted with the front end portion 24b of the second holder member 24, and the diameters of the first holder member 23 and the second holder member 24 are reduced. In addition, in the rear end portions 23a and 24a, an opening rear end portion 6b of the ink storage tube 6 is fitted from the front, and the ink storage tube 6 is detachably held.

  The rear end portion 24a and the front end portion 24b of the second holder member 24 are respectively fitted with the rear end portion 25a and the front end portion 25b of the third holder member 25 from the rear, and the rear end of the third holder member 25. The rear plate 26 is provided with a through hole 27 communicating with the opening 6 c in the rear end 6 b of the ink containing tube 6, and the rear plate having the through hole 27. A pressurizing pump mechanism 16 is connected to the rear of 26.

  The rear end portion 25a having a reduced diameter in the third holder member 25 is externally fitted with a connecting tube material 28 made of a tubular body. The connecting tube material 28 allows the front end flange portion 19a of the pressurizing member 18 to be By bringing the third holder member 25 into close contact with the rear surface of the rear plate 26, the airtightness between the third holder member 25 and the pressurizing chamber 20 in the pressurizing member 18 is maintained.

  The first holder member 23, the third holder member 25, and the connecting pipe material 28 are molded from hard plastic, and the second holder member 24 is molded from an elastomer such as synthetic rubber.

On the inner and outer peripheral surfaces of the second holder member 24 on the rear end portion 24a side, there are an outer peripheral surface of the opening rear end portion 6b of the ink containing tube 6 and an inner peripheral surface of the rear end portion 25a of the third holder member 25. Two annular protrusions 29 and 30 are formed on the front and rear sides, which are in close contact with each other, and the inner peripheral surface of the reduced diameter rear end portion 23a of the first holder member 23 is connected to the outer peripheral surface of the ink containing tube 6. An intimate annular protrusion 31 is formed.
That is, the space between the outer peripheral surface of the second holder member 24 and the inner peripheral surface of the third holder member 25 is sealed by the annular protrusion 29, and the outer peripheral surface of the opening rear end portion 6 b of the ink containing tube 6 and the second holder member. 24 is sealed by an annular protrusion 30, and an annular protrusion 31 is provided between the outer peripheral surface of the opening rear end 6 b of the ink containing tube 6 and the inner peripheral surface of the first holder member 23. It comes to seal.

With the above configuration, the inside of the opening 6c in the opening rear end 6b of the ink containing tube 6 held by the holder member 8 can be effectively sealed, and the pressure can be efficiently applied.
In addition, the contact area on the seal surface between the outer peripheral surface of the opening rear end 6 b of the ink containing tube 6 and the inner peripheral surfaces of the first holder member 23 and the second holder member 24 is determined by the respective annular protrusions 29. , 30, 31 can be reduced by contact, so that the rear end 6b of the ink containing tube 6 in the penfill unit 4 can be easily inserted and held, and the annular protrusions 29, 30, By changing the cross-sectional shape of 31, the holding force between the ink containing tube 6 and the holder member 8 can be easily adjusted.

  Next, an operation procedure of the ballpoint pen 1 in the present embodiment will be described. In the non-pressurized state shown in FIGS. 1 and 2, when the knock portion 11 is pushed forward in a half step against the urging force of the compression spring 12, the knock portion 11 cooperates with this operation and knocks. The rod 13 moves forward, and the rotor 15 is driven halfway through the cam mechanism portion 14.

  As shown in FIG. 3, the half-drive of the rotor 15 moves the pressing member 17 toward the front, presses the pressing member 18 toward the front, and the pressing operation of the pressing member 17 The pressure member 18 is compressed and deformed and closes the rear end port portion 22 of the pressure member 18 by a plug body 21 protruding from the center of the front end of the pressing member 17.

The air in the pressurizing chamber 20 of the pressurizing member 18 compressed by the pressing member 17 is pumped toward the opening 6 c in the rear end 6 b of the ink containing tube 6 to pressurize the inside of the ink containing tube 6.
At this time, the pushing force in the half stage of the knock part 11 is that the spring force of the compression spring 12 biases the pen refill unit 4 backward via the first holder member 23 of the holder member 8. Since the pen refill unit 4 does not move forward, the pen tip 7 is maintained in the pen tip member 3 in a retracted state.

In order to obtain the pressurized state shown in FIG. 3, first, the knock portion 11 is pushed forward by a force stronger than the spring force of the compression spring 9 to cooperate with this operation. 13 moves forward, and the rotor 15 is further driven via the cam mechanism section 14.
At this time, since the pushing force of the knock portion 11 is larger than the spring force of the compression spring 9 that urges the penfill feel unit 4 rearward via the holder member 8, the pen fill feel unit 4 moves forward. The pen tip 7 projects outward from the opening 3 a of the pen tip member 3 in the front end 2 a of the main body barrel 2.

Next, when the pushing operation of the knock part 11 is released, only the knock bar 13 returns backward by the urging force of the compression spring 12, and the rotor 15 is locked at the driving position, so that the pen tip 7 maintains the protruding state. To do.
Further, since the pressing member 17 keeps pressing the pressing member 18, the pressurizing chamber 20 of the pressing member 18 is maintained in a pressurized state.
As a result, when the pen is used, the inside of the ink containing tube 6 can always be maintained in a pressurized state, so that writing with the pen tip facing upward can be easily performed.

After the pen is used, the knocking portion 11 is pushed forward again against the urging force of the compression spring 12 and the knocking rod 13 is operated to release the locked state of the rotor 15 with respect to the cam mechanism portion 14. When the knock bar 13 is returned to the rear by the urging force of the compression spring 12, the rotor 15 is moved rearward together with the pressing member 17 by the urging force of the compression spring 9, and the original shown in FIGS. At the same time, the pressure member 18 also returns from the compressed state to the expanded state, and the inside of the opening 6c at the rear end 6b of the ink containing tube 6 and the pressure chamber 20 of the pressure member 18 are again outside air. And the pressurized state in the ink containing tube 6 is released.
Thereby, a knock operation can be easily performed with a small force, and a ballpoint pen excellent in usability can be obtained.

It is sectional drawing of the ball-point pen in the non-pressurized state which shows one Embodiment of this invention. It is a principal part expanded sectional view of the holder member vicinity in the A section of FIG. It is a principal part expanded sectional view in a pressurization state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ball-point pen 2 Main body axial cylinder 2a Front end part 2b Rear end part 3 Pen tip member 3a Opening part 4 Pen refill unit 5 Ink 6 Ink storage tube 6a Front end part 6b Open rear end part 6c Opening 7 Pen tip 8 Holder member 9 Compression spring 10 Knock Mechanism 11 Knock portion 12 Compression spring 13 Knock bar 14 Cam mechanism portion 15 Rotor 16 Pressure pump mechanism 17 Press member 18 Press member (elastic cylinder)
19a Front end flange 19b Rear end surface 20 Pressurizing chamber 21 Plug 22 Rear end port 23 First holder member 23a Rear end 23b Front end 24 Second holder member 24a Rear end 24b Front end 25 Third holder member 25a Rear end Portion 25b front end portion 26 rear plate 27 through hole 28 connecting pipe material 29 annular projection 30 annular projection 31 annular projection

Claims (4)

The holder member disposed in the main body cylinder is fitted with the rear end of the opening of the ink storage tube provided with a pen tip at the front end from the front to hold the ink storage tube detachably. In a ballpoint pen provided with a pressure pump mechanism that pressurizes the inside of the rear end of the opening of the ink storage tube in conjunction with the knocking operation of the knock mechanism provided at the rear end of the main body barrel,
The holder member is constituted by a first holder member, a second holder member, and a third holder member each having a tubular body whose rear end portion is smaller in diameter than the front end portion, and after the diameter of the first holder member is reduced. The front end portion of the second holder member is fitted on the end portion, and the opening rear end portion of the ink containing tube is fitted from the front in the rear end portions of the first holder member and the second holder member which are reduced in diameter. The ink storage tube is detachably held, and the front end portion and the rear end portion of the second holder member are externally fitted from the rear to the front end portion and the rear end portion, respectively, and the third holder A rear plate having a through hole communicating with the opening at the rear end of the opening of the ink containing tube is provided at the rear end of the member, and a pressure pump mechanism is provided behind the third holder member. Ballpoint pen to do.   On the inner and outer peripheral surfaces of the rear end portion of the second holder member that has been reduced in diameter, annular projections that are in close contact with the outer peripheral surface of the rear end portion of the opening in the ink storage tube and the inner peripheral surface of the rear end portion of the third holder member, respectively. The ballpoint pen according to claim 1 formed.   3. The ballpoint pen according to claim 1, wherein an annular protrusion is formed on the inner peripheral surface of the rear end portion of the first holder member, the diameter of which is reduced, in close contact with the outer peripheral surface of the ink containing tube.   The pressurizing pump mechanism is composed of a pressurizing member made of an elastic cylinder that forms a pressurizing chamber therein, and a pressing member that interlocks with the knocking operation of the knocking mechanism via the cam mechanism, and the third holder member is contracted. The third holder member is configured such that a connecting pipe is externally fitted to the rear end of the diameter, and the front end collar of the elastic cylindrical body in the pressurizing member is brought into close contact with the rear plate of the third holder member by the connecting pipe. The ballpoint pen according to any one of claims 1 to 3, which maintains airtightness between the pressure chamber and the pressure chamber in the elastic cylinder.

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