JP4787687B2 - 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, as disclosed in Patent Document 1, the pen refill unit of the knock type ballpoint pen is provided with a pressurizing pump mechanism composed of a cylinder and a piston, and the piston is slidably contacted with the inner peripheral surface of the cylinder. In addition, an annular elastic ring such as rubber is provided, 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. There is known one that pressurizes (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, on the contrary, a large force is required for the knocking operation at the time of use, which 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; A pressure member that is interlocked with the pushing operation, and pressurizing the inside of the medium accommodating tube by compressing and deforming the pressure member so that the pressure chamber is airtight with the pressure member. By pressing the opening operation of the pressing member, is restored so as to extend the pressing member in the axial direction, the medium accommodation tube, so as capable of maintaining the ventilated with outside air.

(2) In the above item (1), the pressure member is formed of an elastic cylindrical body, and a deformable portion that can be expanded and contracted in the axial direction is formed between the front end and the rear end of the elastic cylindrical body.

(3) In the above item (2), the deformed portion is formed in an annular groove having a V-shaped cross section.

(4) In any one of the above items (1) to (3), the pressing member is caused to follow the rotor driven through the cam mechanism portion by pushing the knock rod in the knock mechanism and releasing the same. The press member is compressed by the operation of pushing the knock bar, and the pen tip is protruded to the outside from the front end portion of the shaft tube while pressurizing the inside of the medium accommodating tube.

(5) In any one of the above items (1) to (4), the pressurizing member is maintained in a compressed state in the protruding state of the pen tip and maintained in an extended state capable of communicating with the 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. Since the inside of the medium housing tube is pressurized, the pressure member can be easily compressed and deformed, so that the knocking operation can be easily performed with a small force, and a pressure pen excellent in usability is provided. can get.

  According to the second aspect of the present invention, the pressure member is formed of an elastic cylindrical body, and a deformable portion that is elastically deformable in the axial direction is formed between the front end and the rear end of the elastic cylindrical body. Therefore, the pressure member can be easily compressed and deformed.

  According to the invention described in claim 3, since the deforming portion is formed in the annular groove having a V-shaped cross section, the pressure member can be easily compressed and deformed.

  According to the fourth aspect of the present invention, the pen member is moved to the shaft cylinder while causing the pressing member to follow the rotor in the knock mechanism, compressing the pressurizing member by the pushing operation of the knock bar, and pressurizing the inside of the medium accommodating tube. 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 of a knock-type ballpoint pen in an unpressurized state showing an embodiment of the present invention, and FIG. In the drawing, “left side” is “front” and “right side” is “back” with respect to the page.

  As shown in FIG. 1, the pen shaft of the ballpoint pen (1) of the present invention includes a shaft tube (2) and a pen tip member (3) screwed to the front end (2a) of the shaft tube (2). The pen refill unit (4) is loaded in the pen shaft.

  The pen refill unit (4) includes an ink storage tube (6) filled with ink (5) as a writing medium, and a pen tip (7) mounted on the front end (6a) of the ink storage tube (6). It consists of The pen tip (7) is projected and retracted from the front end opening (3a) of the pen tip member (3) by pushing 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 can slide back and forth in the shaft tube (2). The holder (8) is a compression spring (9). ), The pen tip (7) of the pen refill unit (4) is urged rearward so that it can be stored in the pen tip member (3).

A knock mechanism (10) is incorporated in the rear end (2b) of the shaft tube (2). The knock mechanism (10) includes a knock portion (11) and a compression spring (12) that urges the knock portion (11) rearward so that the knock portion (11) can protrude from the rear end portion (2b) of the shaft tube (2). ), The knocking portion (11) that pushes against the urging force of the compression spring (12), and the knocking rod (13) that cooperates with the opening operation, and the cam mechanism that is linked to the knocking rod (13). And a rotor (15) cooperating with the cam mechanism (14). 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 portion (11), and releases it. The rotor (15) is driven by the cam mechanism (14), whereby the pen tip (7) of the pen refill unit (4) can be retracted into a retracted state or a protruding state by a known mechanism. is there.

  A pressure pump mechanism (16) is provided between the rear end opening (6b) of the ink containing tube (6) and the front end (15a) of the rotor (15). As shown in FIG. 2, the pressure pump mechanism (16) includes a pressing member (17) that follows the driving of the rotor (15), a front end portion of the pressing member (17), and an ink storage tube (6). And a pressure member (18) provided between the rear end opening (6b).

  The pressure member (18) is formed by an elastic cylinder (19) made of an elastomer such as rubber, and the front end (19a) of the elastic cylinder (19) is opened at the rear end of the ink containing tube (6). The rear end (19b) is assembled in communication with the outside air at the front end of the pressing member (17). An annular groove (20) having a V-shaped cross section is formed in the circumferential direction at an intermediate portion between the front end (19a) and the rear end (19b) of the elastic cylindrical body (19), and the pressing member (17) The inside of the pressurizing chamber (21) formed by the elastic cylindrical body (19) can be expanded and contracted in the front-rear axial direction by a pressing operation accompanying the forward movement of the cylinder.

  At the center of the front end of the pressing member (17), a plug body (17a) protrudes forward, and this plug body (17a) is formed into an annular shape by compressive deformation of the elastic cylindrical body (19) described later. The bent mouth portion (22) formed in the inner peripheral portion of the elastic cylindrical body (19) corresponding to the groove (20) is closed so that the inside of the pressurizing chamber (21) can be maintained in an airtight state. .

FIG. 3 is a cross-sectional view in a pressurization start state, and FIG.
In the non-pressurized state shown in FIG. 1 and FIG. 2, as shown in FIG. 3 and FIG. 4, the knock portion (11) is directed forward in half steps against the urging force of the compression spring (12). When the pushing operation is performed, the knock bar (13) moves forward in cooperation with this operation, and the rotor (15) is driven halfway through the cam mechanism (14). By the half drive of the rotor (15), the pressing member (17) moves forward, and the elastic cylindrical body (19) of the pressing member (18) is moved from the rear end (19a) to the front end (19a). Press toward. Due to the pressing operation of the pressing member (17), the elastic cylindrical body (19) is easily compressed and deformed in the middle portion of the annular groove (20), and the plug protrudes from the center of the front end of the pressing member (17). The body (17a) closes the bent opening (22) formed in the inner peripheral portion of the elastic cylindrical body (19) corresponding to the annular groove (20), and maintains the inside of the pressurizing chamber (21) in an airtight state. To do. At this time, the pushing force in the half stage of the knock portion (11) is smaller than the spring force of the compression spring (9) in which the spring force of the compression spring (12) biases the pen refill unit (4) backward. Since the pen refill unit (4) is set and does not move forward, the pen tip (7) is maintained in the pen tip member (3) in a retracted state.

FIG. 5 is a sectional view in a pressurized state, and FIG. 6 is an enlarged sectional view of the main part.
In the pressurization start state shown in FIGS. 3 and 4, as shown in FIGS. 5 and 6, the knock portion (11) is pushed forward by a force stronger than the spring force of the compression spring (9). Then, in cooperation with this operation, the knock bar (13) moves forward, and the rotor (15) is further driven via the cam mechanism (14). By driving the rotor (15), the pressing member (17) compresses the inside of the pressurizing chamber (21) in an airtight state, and the air in the pressurizing chamber (21) is compressed in the ink containing tube (6). It is pumped toward the rear end opening (6b) to pressurize the rear end opening (6b) of the ink containing tube (6). At this time, since the pushing force of the knock portion (11) is larger than the spring force of the compression spring (9) for urging the pen refill unit (4) backward, the pen refill unit (4) is directed forward. The pen tip (7) moves and protrudes from the inside of the pen tip member (3) at the front end (2a) of the shaft tube (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 in the driving position. The pen tip (7) maintains the protruding state, and the pressing member (17) keeps pressing the elastic cylindrical body (19) of the pressing member (18). The pressure state is maintained.
Thereby, 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 using the pen, the knock part (11) is pushed forward again against the urging force of the compression spring (12), and the knock bar (13) is operated to rotate the cam mechanism part (14). When the locking state of the child (15) is released and the knock bar (13) is returned to the rear by the urging force of the compression spring (12), the rotor (15) is moved by the urging force of the compression spring (9). It moves backward together with the pressing member (17) and returns to the original position shown in FIGS. 1 and 2, and at the same time, the pressure member (18) also returns from the compressed state to the extended state, and again the ink containing tube (6 ) And the pressurizing chamber (21) of the elastic cylindrical body (19) in the pressurizing member (18) are in a state of ventilation with the outside air, and the pressurizing 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.

It is sectional drawing of the knock type ball-point pen in the non-pressurized state which shows one Embodiment of this invention. It is a principal part expanded sectional view similarly. It is sectional drawing in a pressurization start state. It is a principal part expanded sectional view similarly. It is sectional drawing in a pressurization state. It is a principal part expanded sectional view similarly.

Explanation of symbols

(1) Knock-type ballpoint pen
(2) Shaft cylinder
(2a) Front end
(2b) Rear end
(3) Nib member
(3a) Opening
(4) Pen refill unit
(5) Ink (medium)
(6) Ink storage tube
(6a) Front end
(6b) Rear end opening
(7) Pen tip
(8) Holder
(9) Compression spring
(10) Knock mechanism
(11) Knock part
(12) Compression spring
(13) Knock stick
(14) Cam mechanism
(15) Rotor
(16) Pressure pump mechanism
(17) Pressing member
(17a) Plug
(18) Pressure member
(19) Elastic cylinder
(19a) Front end
(19b) Rear end
(20) Annular groove (deformed part)
(21) Pressurization chamber
(22) Bent port

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,
While pressurizing the inside of the medium accommodating tube by compressing and deforming the pressurizing member with the pressing member so that the pressurizing chamber is in an airtight state,
A pressure pen, wherein the pressure member is restored so as to extend in the axial direction by a pressing release operation of the pressure member, and the inside of the medium accommodating tube can be maintained in a state of ventilation with the outside air.   The pressurizing member is formed of an elastic cylindrical body, and a deformable portion capable of expanding and contracting in the axial direction is formed between a front end and a rear end of the elastic cylindrical body. Pressure pen.   3. The pressure pen according to claim 2, wherein the deforming portion is formed in an annular groove having a V-shaped cross section. The pressing member is caused to follow the rotor driven through the cam mechanism by pushing and releasing the knock bar in the knock mechanism, and the pressure member is compressed by the pushing operation of the knock bar, so that the inside of the medium accommodating tube 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 the pressure is applied. The pressurizing member 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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