HK1111387B - Pressurized pen - Google Patents

Description

Pressurized pen

Technical Field

The present invention relates to a pen such as a ball-point pen, a correction pen, a glue application pen, and the like, and more particularly to a pressurizing pen which can smoothly supply a medium such as ink, correction fluid, glue, and the like at the time of use.

Background

When a conventional pen such as a ballpoint pen is used, there are problems that ink cannot be smoothly written from a pen tip for replacing a refill or ink is interrupted during writing, and in this case, the pen tip must be repeatedly scratched on paper to draw out ink.

On the other hand, patent document 1 discloses a technique in which a pressurizing pump mechanism including a cylinder and a piston is provided in a refill of a push-type ballpoint pen, an annular elastic ring made of rubber or the like is provided at a tip end portion of the piston which is in sliding contact with an inner peripheral surface of the cylinder, the pressurizing pump mechanism is interlocked with a pressing mechanism, and a compression chamber in the cylinder is compressed by the piston in accordance with a pressing operation at the time of use, thereby pressurizing an ink tank containing ink (see patent document 1).

However, in the pressurizing pen described in patent document 1, the outer peripheral surface of the annular elastic ring at the distal end portion of the piston is closely attached to the inner peripheral surface of the cylinder and is spaced from the outside air, and when the pressurizing pen is used, the piston is moved forward in conjunction with the pressing mechanism, so that the air in the compression chamber in the cylinder is pressurized. However, when the annular elastic ring is manufactured, the accuracy of the outer diameter dimension of the annular elastic ring is lowered due to the unevenness of the outer diameter, the seam ridge at the joint of the mold, and the like, and the sealing property is sometimes insufficient.

In order to solve the above-described variation problem of the annular elastic ring to improve the sealing property, it is necessary to increase the design value of the outer diameter of the annular elastic ring.

However, when the design value of the outer diameter of the annular elastic ring is increased, a spring having a large spring constant must be used to return the piston to the rear position.

Thus, a pressing operation with a large force is required during use, and a problem arises that the feeling of use is not satisfactory.

[ patent document 1] Japanese laid-open patent application No. 2005-280119

Disclosure of Invention

The present invention has been made in view of the above problems, and an object of the present invention is to provide a pressurizing pen which can be easily pressed with a small force and has an excellent feeling of use.

In order to solve the above problems, the present invention proposes the following technical solutions:

(1) a pressurized pen, it is to contain the replacement refill in the barrel of the pen, the tip of the media storage tube such as ink of this replacement refill has nibs, there is a pressurizing pump mechanism to pressurize in the open area of rear end of the media storage tube at the same time, and can make the nib stretch out or retract from the front end of barrel of the pen to the outside through the pressing mechanism that the rear end of the barrel of the pen is set up; the pressure pump mechanism includes: a pressurizing element which is arranged at the rear end opening part of the media storage tube, can freely stretch and deform in the axial direction and is provided with a pressurizing chamber communicated with the media storage tube; a pressing member that presses the pressing member in a compression direction and is linked to a pressing operation of the pressing mechanism; the pressing member is formed of an elastic cylindrical body including: a large-diameter front cylindrical part, the front end of which is tightly attached to the rear open end of the media storage tube in an airtight state and communicates with the media storage tube, and which forms a pressure chamber; and a small-diameter rear cylindrical portion coaxially connected to a rear end of the front cylindrical portion, a front end portion of a pressing member is pressed from a rear end opening side of the small-diameter rear cylindrical portion toward a front end opening, and the elastic cylindrical body is axially compressed and deformed by a pressing operation of pressing the rear cylindrical portion into the front cylindrical portion by the pressing member, and the pressurizing chamber is in an airtight state, thereby pressurizing the inside of the media storage tube, and the elastic cylindrical body is axially restored and extended by a pressing release operation of the pressing member, thereby maintaining a state of ventilation between the inside of the media storage tube and the outside air.

(2) In the above (1), the elastic cylinder is maintained in a compressed state when the pen tip is in the extended state, and the elastic cylinder is maintained in an extended state in which the elastic cylinder can communicate with the outside air when the pen tip is in the storage state.

The invention has the following effects:

according to the invention described in (1), the pressurizing member of the pressurizing pump mechanism is elastically deformable in the axial direction, and the pressurizing member is compressively deformed in accordance with the pressing operation of the pressing mechanism, thereby pressurizing the inside of the medium storage tube.

The pressurizing member is formed of an elastic cylindrical body having a large-diameter front cylindrical portion whose front end is brought into close contact with and communicates with the rear end opening portion of the medium storage tube in an airtight state and which forms a pressurizing chamber, and a small-diameter rear cylindrical portion which is coaxially connected to the rear end of the front cylindrical portion and into which the front end portion of the pressurizing member is pressed and inserted into the rear end opening, the rear cylindrical portion is pressed into the small-diameter rear cylindrical portion in the front cylindrical portion by the pressing of the pressurizing member, and the pressurizing chamber is brought into an airtight state by a pressing operation of pressing the rear cylindrical portion into the front cylindrical portion by the pressing of the pressurizing member, whereby the pressurizing member can be more easily compressed and deformed.

According to the invention described in (2), since the pressurized state in the medium storage tube can be maintained when the pen is used, it is possible to effectively prevent the occurrence of problems such as ink interruption when the pen tip is used in a state of being directed upward.

Drawings

Fig. 1 is a sectional view of a push type ballpoint pen according to an embodiment of the present invention in a non-pressurized state.

Fig. 2 is an enlarged cross-sectional view of a main part in the non-pressurized state.

Fig. 3 shows a half-sectional perspective view of the pressing member in an enlarged manner.

Fig. 4 shows a cross-sectional view in the pressurization start state.

Fig. 5 is an enlarged partial cross-sectional view of the pressure start state.

Fig. 6 is a perspective view showing a half section in an enlarged state of compression deformation of the pressing member.

Fig. 7 shows a cross-sectional view in the maximum pressurized state.

Fig. 8 is a sectional view in a use state.

Description of the symbols

1 push type ball-point pen

2 Pen holder

2a front end portion

2b rear end portion

3 pen front element

3a opening part

4 replacement pen core

5 ink (Medium)

6 ink storage tube

6a front end portion

6b rear end opening part

7 pen point

8 holding rack

9 compression spring

10 pressing mechanism

11 pressing part

12 compression spring

13 pressing rod

14 cam mechanism part

15 rotor

16 pressure pump mechanism

17 pressing element

17a front end portion

18 pressing element

19 elastic cylinder

20 front cylinder part

20a front end

20b rear wall

21 rear cylinder part

21a rear end opening

21b front end opening

22 pressurized chamber

Detailed Description

The present invention will be described in detail below with reference to a push-type ballpoint pen as an example.

Fig. 1 is a sectional view of a push type ballpoint pen according to an embodiment of the present invention in a non-pressurized state, fig. 2 is an enlarged sectional view of a main part in the non-pressurized state, and fig. 3 is a half-sectional perspective view of an enlarged pressurizing element. In fig. 1, "left" and "right" are respectively referred to as "front" and "rear".

As shown in FIG. 1, a ballpoint pen 1 of the present invention is composed of a barrel 2 accommodating therein a refill 4, and a front member 3 screwed to a tip portion 2a of the barrel 2.

The refill 4 is constituted of an ink tank 6 containing writing medium ink 5 and a pen tip 7 attached to a tip 6a of the ink tank 6, and the pen tip 7 is capable of being extended or retracted from the tip opening 3a of the element 3 according to the operation of the refill 4 described later.

The rear end opening portion 6b side of the ink reservoir 6 is held by a holder 8 which is axially slidable back and forth in the barrel 2, and the holder 8 is urged by a compression spring 9 in a direction in which the pen tip 7 of the refill 4 is pushed into the pen front member 3 to be stored, that is, in a rearward direction.

The rear end portion 2b of the barrel 2 is fitted with a pressing mechanism 10. the pressing mechanism 10 is constituted by a cam mechanism portion 14 in which a pressing lever 13, which is operated in conjunction with a pressing operation against the urging force of a pressing portion 11 and a releasing operation thereof, is linked to the pressing lever 13, and a rotor 15 which is operated in conjunction with the cam mechanism portion 14, wherein the pressing portion 11 applies a pushing force in a rearward direction in which the pressing portion 11 can be projected outward from the rear end portion 2b of the barrel 2. At this time, the elastic force of the compression spring 12 is set to be smaller than that of the compression spring 9.

That is, the pressing mechanism 10 is a known technique in which the pressing operation of the pressing portion 11 causes the pressing rod 13 to be released while being pressed against the urging force of the compression spring 12, and the rotor 15 is driven by the cam mechanism portion 14, whereby the pen tip 7 of the refill 4 is extended and contracted to be in the stored state or the extended state.

A pressure pump mechanism 16 is provided between the rear end opening 6b of the ink tank 6 and the front end 15a of the rotor 15. as shown in fig. 2, the pressure pump mechanism 16 has a pressing element 17 driven by the rotor 15 and a pressing element 18 provided between the pressing element 17 and the rear end opening 6b of the ink tank 6, and the front end 17a of the pressing element 17 is formed to protrude forward in a truncated cone shape and also serves as a stopper capable of closing a front end opening 21b of a rear cylindrical portion 21 in an elastic cylindrical body 19 constituting the pressing element 18 described later.

The pressing member 18 is formed of an elastic cylindrical body 19 made of an elastic material such as rubber, the elastic cylindrical body 19 is formed of a large-diameter front cylindrical portion 20 having a flange-like front end 20a in airtight contact with the rear surface of the holder 8 including the rear end opening portion 6b of the ink storage tube 6 so as to communicate with the rear end opening portion 6b of the ink storage tube 6, and a small-diameter rear cylindrical portion 21 coaxially connected through a rear wall 20b at the rear end of the front cylindrical portion 20, and the front cylindrical portion 20 is internally formed with a pressing chamber 22 in the rear cylindrical portion 21, and a front end portion 17a of the pressing member 17 is pressed from the rear end opening 21a side toward the front end opening 21b side with the insertion of the pressing member 17 and is communicable with the outside air, as shown in fig. 3.

The front end portion 17a of the pressing element 17 is pushed into the front end opening 21b of the rear cylinder portion 21 and closed by a pressing operation of moving the pressing element 17 forward, thereby maintaining the airtight state of the pressurizing chamber 22.

Fig. 4 is a cross-sectional view at the time of start of pressurization, fig. 5 is an enlarged cross-sectional view of a main part at the time of start of pressurization, and fig. 6 is a half-sectional perspective view in which a compression deformation state of the pressurizing element is enlarged.

In the non-pressurized state shown in fig. 1 to 3, as shown in fig. 4 to 6, when the pressing portion 11 is half-pressed forward against the urging force of the compression spring 12, the pressing rod 13 moves forward in conjunction with this operation, the rotor 15 is half-driven by the cam mechanism portion 14, the pressing element 17 moves forward, the tip end portion 17a thereof is pressed into the tip end opening 21b to be in a pressed state, and the inside of the pressurizing chamber 22 is maintained in an airtight state.

Then, in response to further pressing operation of the pressing element 17, the rear cylinder portion 21 bends and deforms the rear end portion of the front cylinder portion 20 to the rear side and the rear wall 20b to the rear side, and is pressed into the front cylinder portion 20 in a manner of being bored, thereby compressing the inside of the compression chamber 22, and the compressed air is sent under pressure into the rear end opening portion 6b of the ink storage tube 6, whereby the inside of the rear end opening portion 6b can be pressurized.

At this time, the half-pressing force of the pressing part 11 is set so that the elastic force of the compression spring 12 is smaller than the elastic force of the compression spring 9 in the backward direction with respect to the refill 4, and the refill 4 does not move forward, so that the pen tip 7 can be kept stored in the pen front member 3.

Fig. 7 is a sectional view in the maximum pressurized state. Fig. 8 is a sectional view in a use state.

In the pressurizing start state shown in fig. 4 to 6, when the pressing operation of the pressing part 11 is performed forward using a strong force larger than the elastic force of the compression spring 9 as shown in fig. 7, the pressing rod 13 moves forward in conjunction with the operation, and the rotor 15 is further driven by the cam mechanism 14 to compress the inside of the pressurizing chamber 22 in the airtight state by the pressing element 17 according to the driving of the rotor 15, so that the air in the pressurizing chamber 22 is pumped into the rear end opening part 6b of the ink storage tube 6, and the inside of the rear end opening part 6b of the ink storage tube 6 is further pressurized, the pressing force of the pressing part 11 is larger than the elastic force of the compression spring 9 in the backward direction with respect to the refill 4, and therefore the refill 4 moves forward, and the pen tip 7 protrudes outward from the inside of the front part 3 of the front end part 2a of the barrel 2.

When the pressing operation of the pressing part 11 is released, as shown in fig. 8, only the pressing rod 13 is returned to the desired locking position at the rear 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 is maintained in the extended state, and the pressing element 17 is still in the pressed state against the elastic cylindrical body 19 of the pressing element 18, so that the inside of the pressing chamber 22 is maintained in the pressed state.

Therefore, when the pen is used, the ink storage tube 6 can be kept in a pressurized state at any time, and writing in a state in which the pen tip is directed upward can be easily performed.

When the pressing lever 13 is operated by pressing the pressing portion 11 forward against the urging force of the compression spring 12 again after the pen is used, the locked state of the rotor 15 with respect to the cam mechanism portion 14 is released, the pressing lever 13 is returned to the rear by the urging force of the compression spring 12, the rotor 15 is moved backward together with the pressing element 17 by the urging force of the compression spring 9, and is returned to the initial position shown in fig. 1 and 2, the elastic cylindrical body 19 of the pressing element 18 is also returned from the compressed state to the extended state, and the pressing chamber 22 located inside the ink storage tube 6 and inside the front cylindrical portion 20 of the elastic cylindrical body 19 is again brought into an air-permeable state by the front end portion 17a being separated from the front end opening 21b of the rear cylindrical portion 21 as the pressing element 17 is returned to the rear, and the pressurized state inside the ink storage tube 6 is released.

Therefore, the pressurizing pen can be easily pressed with a small force and has excellent use feeling.

Claims (2)

1. A pressurized pen, it is to contain the replacement refill in the barrel of the pen, the tip of the media storage tube such as ink of this replacement refill has nibs, there is a pressurizing pump mechanism to pressurize in the open area of rear end of the media storage tube at the same time, and can make the nib stretch out or retract from the front end of barrel of the pen to the outside through the pressing mechanism that the rear end of the barrel of the pen is set up; the method is characterized in that:

the pressure pump mechanism includes: a pressurizing element which is arranged at the rear end opening part of the media storage tube, can freely stretch and deform in the axial direction and is provided with a pressurizing chamber communicated with the media storage tube; a pressing member that presses the pressing member in a compression direction and is linked to a pressing operation of the pressing mechanism;

the pressing member is formed of an elastic cylindrical body including: a large-diameter front cylindrical part, the front end of which is tightly attached to the rear open end of the media storage tube in an airtight state and communicates with the media storage tube, and which forms a pressure chamber; and a small-diameter rear cylindrical portion coaxially connected to a rear end of the large-diameter front cylindrical portion, a front end portion of the pressing member being pressed from a rear end opening side of the small-diameter rear cylindrical portion toward the front end opening,

the pressing action of pressing the rear cylindrical part into the front cylindrical part by the pressing of the pressing element causes the elastic cylindrical body to be compressed and deformed in the axial direction, the pressure chamber is in an airtight state, and the medium storage tube is pressurized,

at the same time, the elastic cylinder body is restored and extended in the axial direction by the pressing and releasing action of the pressing element, and the ventilation state between the inside of the medium storage pipe and the outside air is maintained.

2. The pressurized pen of claim 1, wherein: the elastic cylinder is maintained in a compressed state when the pen tip is in an extended state, and in an extended state in which the elastic cylinder is communicable with outside air when the pen tip is in a stored state.