JP4309432B2 - Pressure pen - Google Patents

Description

  The present invention relates to a pen such as a ballpoint pen, a correction pen, a glue application pen, and the like, and more particularly, to a pressure pen that can smoothly supply a medium such as ink, correction liquid, and glue during use.

  When using a conventional pen, for example, a ballpoint pen, the ink may not come out smoothly from the pen tip of the pen refill unit, or the ink may run out during writing. There was often a problem that the ink had to be removed by rubbing.

  On the other hand, conventionally, as disclosed in Patent Document 1, the pen refill unit of the knock-type ballpoint pen is provided with a pressurizing pump mechanism including a cylinder and a piston, and the piston slidingly contacts the inner peripheral surface of the cylinder. An annular elastic ring such as rubber is provided at the tip, and the pressure pump mechanism is linked to the knock mechanism, and the compression chamber in the cylinder is compressed by the piston by the knocking operation at the time of use, so that the ink is filled. There is known one in which the inside of an ink containing tube is pressurized (see Patent Document 1).

However, in the thing of patent document 1, the outer peripheral surface of the cyclic | annular elastic ring in the front-end | tip part of a piston is closely_contact | adhered to the internal peripheral surface of a cylinder, and is interrupted | blocked with external air. The air in the compression chamber in the cylinder is pressurized by moving the ring, but when manufacturing the ring elastic ring, the ring elastic ring is caused by variations in the outer diameter or flash at the joint of the mold. The dimensional accuracy of the outer diameter may be reduced, and the sealing performance may be insufficient.
In order to absorb such a change in the annular elastic ring and improve the sealing performance, it is necessary to take a large design value of the outer diameter of the annular elastic ring.
On the other hand, if the design value of the outer diameter of the annular elastic ring is large, it is necessary to use a spring having a large spring coefficient in order to return the piston to the original position at the rear.
Then, conversely, a large force is required for the knocking operation at the time of use, and there is a problem that it is not preferable in terms of use.
JP 2005-280119 A

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a pressure pen that can easily perform a knocking operation with a small force and has excellent usability.

According to the present invention, the above problem is solved as follows.
(1) A pen-fill unit is loaded in the shaft cylinder, a pen tip is provided at the front end of a medium-housing pipe for ink or the like in the pen-filling unit, and a pressure pump for pressurizing the inside of the rear end opening of the medium-housing pipe In a pressure pen provided with a mechanism, and a pen tip facing the outside from the front end portion of the shaft tube by a knock mechanism provided at the rear end portion of the shaft tube, the pressure pump mechanism is accommodated in the medium. A pressurizing chamber that communicates with the inside of the pipe, and a pressurizing member that is provided in the rear end open portion of the medium containing pipe so as to be elastically deformable in the axial direction; and pressurizing the pressurizing member in the compressing direction; The pressure member is formed of an elastic cylinder, and the elastic cylinder is brought into contact with the opening of the rear end of the medium accommodating tube in an airtight state. A large diameter front cylindrical portion that communicates with each other and forms a pressurizing chamber, and is coaxially connected to the rear end of the front cylindrical portion, and the front end portion of the pressing member is pushed and inserted into the rear end opening side. The elastic cylindrical body is compressed and deformed in the axial direction so that the pressurizing chamber is in an airtight state by being pushed into the front cylindrical portion of the rear cylindrical portion by the pressing of the pressing member. Thus, the inside of the medium accommodating tube is pressurized, and the elastic cylinder is restored to extend in the axial direction by the pressing and releasing operation of the pressing member, so that the inside of the medium accommodating tube is maintained in a state of ventilation with the outside air.

(2) In the above item (1), a hooking portion having a diameter larger than that of the front end opening of the rear cylindrical portion facing the pressure chamber of the front cylindrical portion is provided at the front end portion of the pressing member.

(3) In the above item (2), a ventilation groove communicating with the front end opening of the rear cylindrical portion is provided on the rear surface of the hook portion.

(4) In any one of the above items (1) to (3), the pressing member is driven through the cam mechanism portion by pushing and releasing the knock bar in the knock mechanism, and is made to follow the rotor and knocks. By pushing the rod, the elastic cylindrical body is compressed and the inside of the medium accommodating tube is pressurized, and the pen tip is protruded to the outside from the front end portion of the shaft tube.

(5) In any one of the above items (1) to (4), the elastic cylindrical body is maintained in a compressed state in a protruding state of the pen tip and maintained in an extended state capable of communicating with outside air in the retracted state of the pen tip. I will let you.

According to the present invention, the following effects can be obtained.
According to the first aspect of the present invention, the pressurizing member of the pressurizing pump mechanism can be expanded and contracted in the axial direction, and is compressed and deformed by the pressing member interlocked with the pushing operation of the knock mechanism. The pressurizing member can be easily compressed and deformed by pressurizing the inside of the medium containing tube, so that the knocking operation can be easily performed with a small force, and a pressurizing pen excellent in usability can be obtained. can get.
Further, the pressurizing member is formed of an elastic cylindrical body, and the elastic cylindrical body is communicated with the front end in contact with the open end of the rear end of the medium containing tube in an airtight state and forms a pressurizing chamber. Formed by a large-diameter front cylindrical portion and a small-diameter rear cylindrical portion that is coaxially connected to the rear end of the front cylindrical portion and the front end portion of the pressing member is pushed and inserted into the rear end opening side. Since the pressurizing chamber is brought into an airtight state by pushing the rear cylindrical portion into the front cylindrical portion by pressing the member, the pressurizing member can be easily compressed and deformed.

  According to the second aspect of the present invention, when the pressing member is released, the elastic cylindrical body can be easily extended and restored in the axial direction by the hook between the front end opening of the rear cylindrical portion and the hooking portion.

  According to the invention of claim 3, when the pressing member is released, the ventilation state between the pressurizing chamber and the front end opening of the rear cylindrical portion can be maintained, and the elastic cylindrical body is easily extended in the axial direction. Can be restored.

  According to the invention described in claim 4, the pressing member is caused to follow the rotor in the knocking mechanism, and the elastic cylinder is compressed by the pushing operation of the knocking rod, and the inside of the medium accommodating tube is pressurized, and the pen tip is moved to the shaft cylinder. Therefore, pressurization in the medium accommodating tube can be performed smoothly.

  According to the fifth aspect of the present invention, since the inside of the medium accommodating tube can be maintained in a pressurized state when the pen is used, it is particularly effective for preventing the ink from running out when the pen tip is used in an upward state. It is.

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 showing a non-pressurized state of a knock-type ballpoint pen provided with a pressurizing pump mechanism according to a first embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part of the pressurizing pump mechanism in a non-pressurized state. FIG. 3 is an enlarged perspective view of a half-section of the pressure member. In the drawing, “left side” is “front” and “right side” is “back” with respect to the page.

  As shown in FIG. 1, in the ballpoint pen 1 of the present invention, a pen shaft is composed of a shaft tube 2 and a pen tip member 3 screwed to the front end 2a of the shaft tube 2, and the pen shaft includes a pen shaft. The 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 exposed to the outside from the front end opening 3a of the pen tip member 3 by the movement of the pen refill unit 4 described later.

  The rear end opening 6b side of the ink containing tube 6 is held by a holder 8 that is slidable in the front and rear axial directions within the shaft cylinder 2, and this holder 8 is a pen tip of the pen refill unit 4 by a compression spring 9. 7 is urged rearward so that it can be stored in the pen tip member 3.

A knock mechanism 10 is assembled in the rear end 2b of the shaft cylinder 2. The knock mechanism 10 includes a knock portion 11, a compression spring 12 that urges the knock portion 11 rearward so that the knock portion 11 can protrude from the rear end portion 2 b of the shaft cylinder 2, and the urging force of the compression spring 12. A knock bar 13 that cooperates with the pushing operation of the knocking part 11 and the opening operation thereof, a cam mechanism part 14 that is linked to the knock bar 13, and a rotor 15 that cooperates with the cam mechanism part 14. Yes.
In this case, the spring force of the compression spring 12 is set smaller than the spring force of the compression spring 9.
That is, the knock mechanism 10 pushes the knock bar 13 against the urging force of the compression spring 12 by the knocking operation of the knock part 11 and opens the rotor 15 by the cam mechanism part 14. This is a known mechanism that allows the pen tip 7 of the pen refill unit 4 to be moved into and out of the retracted state or the protruded state.

A pressure pump mechanism 16 is provided between the rear end opening 6 b of the ink containing tube 6 and the front end of the rotor 15.
As shown in FIG. 2, the pressurizing pump mechanism 16 includes a pressing member 17 that follows the driving of the rotor 15, and an additional member provided between the pressing member 17 and the rear end opening 6b of the ink containing tube 6. The pressure member 18 is configured.
The front end portion 17a of the pressing member 17 protrudes forward so as to form a truncated cone shape, and closes the front end opening 21b of the rear cylindrical portion 21 in the elastic cylindrical body 19 constituting the pressurizing member 18 described later. Also serves as a plug.

The pressure member 18 is formed of an elastic cylindrical body 19 made of an elastomer such as rubber.
As shown in FIG. 3, the elastic cylindrical body 19 abuts the rib-shaped front end 20a against the rear surface of the slider 8 including the rear end opening 6b of the ink containing tube 6 in an airtight state. A large-diameter front cylindrical portion 20 communicated with the rear end open portion 6b of the rear end 6 and a small-diameter rear cylindrical portion 21 coaxially connected to the rear end of the front cylindrical portion 20 via the rear wall 20b. While being formed, the inside of the front cylindrical portion 20 is used as a pressurizing chamber 22.
The rear cylindrical portion 21 is pushed and inserted from the rear end opening 21a side toward the front end opening 21b so that the front end portion 17a of the pressing member 17 can communicate with the outside air.

  The front end portion 17a of the pressing member 17 is press-fitted into the front end opening 21b of the rear cylindrical portion 21 by a pressing operation associated with the forward movement of the pressing member 17, and thereby the airtight state of the pressurizing chamber 22 is maintained. It has come to be.

  4 is a cross-sectional view in a pressurization start state, FIG. 5 is an enlarged cross-sectional view of the main part of the pressurization pump mechanism in the pressurization start state, and FIG. It is a perspective view.

In the non-pressurized state shown in FIGS. 1 to 3, as shown in FIGS. 4 to 6, when the knock portion 11 is pushed forward in a half step against the urging force of the compression spring 12. In cooperation with this operation, the knock bar 13 moves forward, and the rotor 15 is half-driven via the cam mechanism section 14.
By the half drive of the rotor 15, the pressing member 17 moves forward, and its front end portion 17a is pushed into the front end opening 21b in a press-fitted state, thereby maintaining the inside of the pressurizing chamber 22 in an airtight state.

  Next, by further pushing operation of the pressing member 17, the rear cylindrical portion 21 is bent and deformed in the front cylindrical portion 20 while bending and deforming the rear end portion of the front cylindrical portion 20 toward the inside front and the rear wall 20 b toward the rear. The inside of the pressurizing chamber 22 is compressed by being submerged, and the compressed air is pumped into the rear end opening 6b of the ink containing tube 6 so that the inside of the rear end opening 6b can be pressurized. Yes.

  At this time, the pushing force in the half stage of the knock portion 11 is set so that the spring force of the compression spring 12 is smaller than the spring force of the compression spring 9 that urges the pen refill unit 4 backward. Since 4 does not move forward, the pen tip 7 is maintained in the pen tip member 3 in a retracted state.

  FIG. 7 is a cross-sectional view in the maximum pressure state, and FIG. 8 is a cross-sectional view in the pressure state during use.

In the pressurization start state shown in FIGS. 4 to 6, if the knock part 11 is pushed forward by a force stronger than the spring force of the compression spring 9 as shown in FIG. As a result, the knock bar 13 moves forward, and the rotor 15 is further driven via the cam mechanism section 14.
By driving the rotor 15, the pressing member 17 compresses the inside of the pressurizing chamber 22 in an airtight state, and the air in the pressurizing chamber 22 is pumped toward the inside of the rear end opening 6 b of the ink containing tube 6. Then, the rear end opening 6b of the ink containing tube 6 is further pressurized.
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 pen refill unit 4 backward, the pen refill unit 4 moves forward, and the pen tip 7 The front end portion 2a of the two protrudes from the inside of the nib member 3 to the outside.

Next, when the pushing operation of the knock part 11 is released, as shown in FIG. 8, only the knock bar 13 is returned to the desired rearward locking position by the urging force of the compression spring 12, and the rotor 15 is moved to the driving position. Since the pen tip 7 is kept in the protruding state because it is locked, the pressing member 17 keeps pressing the elastic cylindrical body 19 of the pressing member 18, so that the inside of the pressing chamber 22 is in a pressurized state. Is maintained.
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. Return to the position.
At the same time, the elastic cylindrical body 19 of the pressure member 18 also returns from the compressed state to the expanded state, and the pressure chamber 22 in the ink containing tube 6 and in the front cylindrical portion 20 of the elastic cylindrical body 19 again becomes the pressure member 17. With the return to the rear, the rear cylindrical portion 21 of the front end portion 17a is detached from the front end opening 21b, so that a ventilation state is established, and the pressure state in the ink containing tube 6 is released.
Thereby, a knocking operation can be easily performed with a small force, and a pressure pen excellent in usability can be obtained.

  FIG. 9 is an enlarged exploded perspective view showing the pressurizing member of the pressurizing pump mechanism according to the second embodiment of the present invention in a half section, and FIG. 10 is a schematic diagram of the knock type ballpoint pen in the non-pressurizing state of the pressurizing pump mechanism. FIG. 11 is an enlarged sectional view of the main part of the knock ballpoint pen in a pressurized state of the pressure pump mechanism.

  As shown in FIG. 9, the pressurizing pump mechanism 23 in the second embodiment includes a pressing member 24 and a pressurizing member 25, similarly to the pressurizing pump mechanism 16 of the first embodiment.

  As in the first embodiment, the pressing member 25 includes a large-diameter front cylindrical portion 27 and a small-diameter rear cylindrical portion that are coaxially connected to the rear end of the front cylindrical portion 27. 28, and the inside of the front cylindrical portion 27 is a pressurizing chamber 29.

The pressing member 24 is larger than the front end opening 28b via a connecting portion 24b having a smaller diameter than the front end opening 28b of the rear cylindrical portion 28 on the front end portion 24a that protrudes forward to form a truncated cone shape. A large hook 30 is provided.
The hook portion 30 can be pushed and inserted so as to face the pressure chamber 29 from the rear end opening 28a side of the rear cylindrical portion 28 of the pressure member 25 toward the front end opening 28b. Is provided with a ventilation groove 31 that can communicate with the outside air through the front end opening 28 b of the rear cylindrical portion 28.

As shown in FIG. 10, in the non-pressurized state, the pressing member 24 pushes the knock portion 32 forward in half steps against the urging force of the compression spring 33, and cooperates with this operation. As shown in FIG. 11, the front end of the frustoconical shape is moved by the rotor 36 that moves and moves the knock bar 34 forward and moves halfway through the cam mechanism 35. By pressing the portion 24a into the front end opening 28b in a press-fit state, the inside of the pressurizing chamber 29 can be compressed while maintaining the inside of the pressurizing chamber 29 in an airtight state.
As a result, the compressed air in the pressurizing chamber 29 is pressure-fed into the rear end opening portion 37a of the ink storage tube 37 so that the rear end opening portion 37a can be pressurized.

On the other hand, in the pressurized state shown in FIG. 11, when the knock portion 32 is pushed forward again against the urging force of the compression spring 33 and the knock bar 34 is operated, the rotor for the cam mechanism portion 35 is operated. The locked state of 36 is released, and the rotor 36 moves rearward together with the pressing member 24 and returns to the original position.
At this time, along with the return of the pressing member 24, the rear surface 30 a of the hook portion 30 at the front end portion 24 a of the pressing member 24 corresponds to the rear end of the front cylindrical portion 27 and the front end of the rear cylindrical portion 28 in the elastic cylindrical body 26 of the pressing member 25. Therefore, the rear cylindrical portion 28 is positively returned from the compressed state to the extended state.
As a result, the pressurizing chamber 29 is detached from the front cylindrical opening 28 of the rear cylindrical portion 28 of the truncated cone shape in the pressing member 24 and the rear surface of the hooking portion 30 when the pressing member 24 returns to the rear. The ventilation groove 31 provided in 30a makes the ventilation state, and the pressurization state in the ink containing tube 37 is released.

It is sectional drawing which shows the non-pressurization state of the knock type ball-point pen provided with the pressurization pump mechanism in 1st Embodiment of this invention. It is a principal part expanded sectional view of the pressurization pump mechanism in a non-pressurization state. It is a half section perspective view expanding and showing a pressurizing member. It is sectional drawing in a pressurization start state. It is a principal part expanded sectional view of the pressurization pump mechanism in a pressurization start state. It is a half cross-sectional perspective view which expands and shows the compression deformation state of a pressurization member. It is sectional drawing in the maximum pressurization state. Similarly, it is sectional drawing in a use condition. It is an expansion disassembled perspective view which shows the pressurization member of the pressurization pump mechanism in 2nd Embodiment of this invention as a judgment surface. It is a principal part expanded sectional view of the knock type ball-point pen in the non-pressurized state of a pressure pump mechanism. Similarly, it is a principal part expanded sectional view of the knock type ball-point pen in the pressurization state of a pressure pump mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Knock-type ball-point pen 2 Shaft cylinder 2a Front end part 2b Rear end part 3 Pen tip member 3a Opening part 4 Pen refill unit 5 Ink (medium)
6 Ink receiving tube 6a Front end portion 6b Rear end opening portion 7 Pen tip 8 Holder 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 17a Front end portion 18 Pressurizing member 19 Elastic cylindrical body 20 Front cylindrical portion 20a Front end 20b Rear wall 21 Rear cylindrical portion 21a Rear end opening 21b Front end opening 22 Pressurizing chamber 23 Pressurizing pump mechanism 24 Pressing member 24a Front end 24b Connecting portion 25 Pressurizing member 26 Elastic cylinder 26a Bulkhead 27 Front cylindrical portion 28 Rear cylindrical portion 28a Rear end opening 28b Front end opening 29 Pressurizing chamber 29a Partition 30 Hook 30a Rear surface 31 Venting groove 32 Knock portion 33 Compression spring 34 Knock bar 35 Cam mechanism portion 36 Rotor 37 Ink receiving tube 37a Rear end opening

Claims (5)

A pen refill unit is loaded in the shaft cylinder, a pen tip is provided at the front end of a medium accommodating tube for ink or the like in this pen refill unit, and a pressure pump mechanism for pressurizing the inside of the rear end open portion of the medium accommodating tube is provided. In the pressure pen that the pen tip is exposed to the outside from the front end portion of the shaft tube by a knock mechanism provided at the rear end portion of the shaft tube,
The pressurizing pump mechanism has a pressurizing chamber that communicates with the inside of the medium accommodating tube, and is provided with a pressurizing member that is provided in the axially extending and contracting direction at the rear end open portion of the medium accommodating tube, and the pressurizing member in the compressing direction. A pressing member that presses and interlocks with the pushing operation of the knock mechanism,
The pressurizing member is formed of an elastic cylindrical body, and the elastic cylindrical body is communicated with the front end in contact with the open end of the rear end of the medium accommodating tube in an airtight state and forms a pressurizing chamber. A front cylindrical portion having a diameter, and a rear cylindrical portion coaxially connected to the rear end of the front cylindrical portion, and a small diameter rear cylindrical portion into which the front end portion of the pressing member is pushed and inserted into the rear end opening side,
While pressing the inside of the medium accommodating tube by compressing and deforming the elastic cylindrical body in the axial direction so that the pressurizing chamber is in an airtight state by pushing the rear cylindrical portion into the front cylindrical portion by pressing of the pressing member,
A pressure pen, wherein the elastic cylinder is restored so as to extend in the axial direction by a pressing release operation of the pressing member, and the inside of the medium accommodation tube is maintained in a state of ventilation with the outside air.   The pressure pen according to claim 1, wherein a hooking portion having a diameter larger than that of the front end opening of the rear cylindrical portion facing the pressure chamber of the front cylindrical portion is provided at the front end portion of the pressing member.   The pressure pen according to claim 2, wherein a vent groove communicating with the front end opening of the rear cylindrical portion is provided on the rear surface of the hook portion.   The pressing member is driven through the cam mechanism by pushing and releasing the knock bar in the knock mechanism, and is made to follow the rotor, and the elastic cylinder is compressed by the pushing operation of the knock bar, and the inside of the medium accommodating tube is compressed. The pressure pen according to any one of claims 1 to 3, wherein the pen tip is protruded to the outside from the front end portion of the shaft tube while being pressurized.   The elastic cylindrical body is maintained in a compressed state in the protruding state of the pen tip, and is maintained in an extended state capable of communicating with outside air in the retracted state of the pen tip. The pressure pen described in 1.

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