JP4153314B2 - Refill advance / retreat unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a refill advance / retreat unit that can be attached to a retractable writing instrument that causes a writing tip of a refill to appear and retract.
[0002]
[Prior art]
Conventionally, in this type of invention, a knock body that can be knocked in a shaft cylinder, a rotor that rotates by engaging with a front end cam slope of the knock body, a cam slope of the inner surface of the shaft cylinder, and the like, A return spring that biases the rotor rearward and a refill that has a rear end fitted in the rotor, and the knock body is knocked to advance the rotor in the axial direction. There are a number of mechanisms in which the rotor is rotated to the locked state and the knocking body is knocked again to release the locked state and retract the rotor in the axial direction.
[0003]
By the way, according to the prior art, there is a problem that it takes time to assemble the complicated rotating mechanism having the above-described configuration, and the return spring is detached or deformed during the assembling work. Therefore, in order to solve this problem, the return spring is incorporated in the rotor in advance and is fitted into the cam cylinder together with the knock body so that the return spring does not come off or deform during the assembly work. There is a knock type writing instrument (see Patent Document 1).
[0004]
However, according to the latter knock type writing instrument, the knock operation cannot be performed unless the return spring, the rotor, the knock body, the knock cover, the cam cylinder, the receiving seat and the like are configured in the shaft cylinder. It was. Therefore, for example, after the knock-type writing instrument has been assembled, if an operation failure is found by an operation check inspection, the completed knock-type writing instrument is discarded or disassembled to dispose of defective parts. There was a problem that it was necessary to do this, and the trouble and the amount of loss for disposing the defective product were large.
Furthermore, although the knock type writing instrument has been improved in terms of assembly workability, it is difficult to manage many parts such as a return spring, a rotor, a knock body, a knock cover, a cam cylinder, and a receiving seat. Further improvements were required for assembly workability.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-240485
[Problems to be solved by the invention]
The present invention has been made in view of the above-mentioned conventional circumstances, and the subject of the present invention is that it is possible to perform an operation confirmation inspection in a single item state separate from the shaft tube, and to greatly increase the productivity of the retractable writing instrument. It is to provide a refill advance / retreat unit that can be improved.
[0007]
[Means for Solving the Problems]
One means for solving the above-mentioned problem is a refill advance / retreat unit provided with an advance / retreat mechanism for advancing / retreating the refill mounting part in the axial direction by operation of the operation part, wherein the advance / retreat mechanism can be operated independently. And is formed so as to be attachable to the shaft cylinder of the retractable writing instrument.
[0008]
Here, the advance / retreat mechanism may be any mechanism that moves the refill attachment portion forward or backward in the axial direction by operating the operation portion. As a specific example, the operation portion is knocked. When operated, the refill mounting portion is advanced in the axial direction to be locked, and when the operation portion is knocked again, the locking state is released to retract the refill mounting portion in the axial direction. The mechanism and the operation portion are rotated in a predetermined rotation direction to advance the refill mounting portion in the axial direction, and the operation portion is rotated in the reverse direction to move the refill mounting portion in the axial direction. Examples include a backward movement mechanism and other known advance / retreat mechanisms.
The refill advance / retreat unit includes a configuration including only the advance / retreat mechanism and a configuration in which the advance / retreat mechanism includes another member (for example, a clip).
In addition, the refill mounting portion means a portion where a writing instrument refill such as a ballpoint pen refill or a mechanical pencil refill can be mounted.
The above-mentioned retractable writing instrument is a writing instrument configured by assembling the refill advance / retreat unit, and means a writing instrument in which the writing tip portion of the refill for writing instrument is caused to appear and disappear by the operation of the refill advance / retreat unit. To do.
The shaft tube may be any one that is built in such a manner that the refill can be projected and retracted in the axial direction, such as one that is integrally formed, one that is composed of a plurality of members such as a front shaft and a rear shaft, and the like. Including.
[0009]
Further means is characterized in that the advance / retreat mechanism is formed so as to be attachable to a rear end portion of the shaft cylinder in the retractable writing instrument.
[0010]
In the further means , the advance / retreat mechanism is integrally provided with an urging member for urging the refill mounting portion, and the advance / retreat mechanism is operated by the urging member when the operation portion is knocked. The refill mounting portion is moved forward to a locked state against urging, and the operation portion is knocked again to release the locked state and retract the refill mounting portion. It is characterized by being.
[0011]
In a further means , the refill mounting portion is slidably provided in the axial direction and is integrally provided with a middle piece that can be mounted on the rear end portion of the shaft cylinder of the retractable writing instrument and a receiving member that receives the biasing member. The receiving member is engaged with the middle piece so as to be slidable in the axial direction.
[0012]
In the further means , the advance / retreat mechanism is provided in the middle piece from the front side of the middle piece, the rotor having the operation portion, the refill attachment portion, and the rotor to urge the rotor backward. The receiving member including the biasing member is configured to be inserted in order, and the operation portion is knocked so that the rotor is moved forward in the axial direction and then locked. The mechanism is a mechanism for releasing the locking state and retreating the rotor when the operation unit is knocked again, and the operation unit is a knock body that is knocked from the rear. The knocking body is configured to include the rear end side of the refill over substantially the entire length of the knock body.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The refill advance / retreat unit 1 includes an operation unit 20, a rotor 30 having a refill attachment unit 33, and the rotor 30 in the middle piece 10 from the front side (lower side in FIG. 1) of the middle piece 10. The receiving member 50 containing the biasing member 40 is inserted in order to bias backward.
[0014]
The refill advance / retreat unit 1 is configured such that when the operation unit 20 is knocked, the rotor 30 is advanced in the axial direction and then rotated to be locked, and the operation unit 20 is knocked again. Thus, the advancing / retreating mechanism that releases the locking state and retracts the rotor 30 is configured as an integral structure that can be operated independently (see FIG. 1).
[0015]
Further, the refill advance / retreat unit 1 is formed in a shape that can be attached to the rear end portion of the shaft cylinder 60 of the retractable writing instrument A (see FIGS. 3 and 4).
[0016]
The middle piece 10 has a substantially stepped cylindrical shape including a front side portion 11 built in the shaft cylinder 60 and a rear side portion 12 protruding rearward of the coaxial cylinder 60.
[0017]
The front portion 11 has an annular protrusion 11a on the outer peripheral surface thereof for getting over and fitting the annular protrusion 61 on the inner peripheral surface of the shaft tube 60, and a notch 62 at the rear end of the shaft tube 60 (see FIG. 3). An anti-rotation protrusion 11c for engaging with the outer peripheral surface is formed, and a plurality of protrusions 11b for engaging a receiving member 50 described later are formed on the inner peripheral surface in the circumferential direction.
[0018]
The rear portion 12 is formed to have an outer diameter that is slightly larger than the front portion 11. A supporting portion 12 a for supporting the clip 70 of the retractable writing instrument A is provided on the outer peripheral surface in a range from the rear side portion 12 to the front side portion 11.
The clip 70 is attached to the support portion 12a by a plate spring 71 having a substantially U shape in side view. The work of attaching the clip 70 to the support portion 12a may be performed before or after the refill advance / retreat unit 1 is attached to the shaft tube 60.
[0019]
The middle piece 10 has a plurality of middle piece cam slopes 12c projectingly provided on its inner peripheral surface to a rotor cam slope 31a1 of the rotor 30 to be described later. A plurality of slide grooves 12b and 12b 'are provided for guiding the protrusions 31a and the protrusions 22 of the middle piece 10 in the axial direction.
[0020]
The operation unit 20 is a knock body that is knocked from the rear, and is formed in a substantially bottomed cylindrical shape with the front end face opened and the rear end face closed, and the rotor cam slope 31a1 of the rotor 30 is formed on the front end face. An operating portion cam slope 21 is formed for sliding contact with the cam. Further, a protrusion 22 for engaging with the slide grooves 12b and 12b ′ of the middle piece 10 is formed on the outer peripheral surface of the operation unit 20.
And this operation part 20 is contained in the middle piece 10 in the state which made the rear-end part protrude back, and is knocked from the outside.
In addition, a cylindrical portion 32 of the rotor 30 described later is included in the operation portion 20 over substantially the entire length thereof. Further, the rear end side of the refill 80 is contained inside the cylindrical portion 32 over substantially the entire length thereof.
[0021]
Specifically, the slide grooves 12b and 12b ′ in the intermediate piece 10 are grooves 12b formed relatively deep so as to guide both the protrusion 31a of the rotor 30 and the protrusion 22 of the operation portion 20 in the axial direction. The groove 12b ′ is formed so as to be relatively shallow so as to guide only the protrusion 22 of the operation unit 20 in the axial direction, and these two types of grooves 12b and 12b ′ are alternately arranged in the circumferential direction.
The two types of grooves 12b and 12b ′ are both on the front end side in the groove so as not to penetrate the operation part 20 inserted from the front end opening of the middle piece 10 to the rear of the middle piece 10. And the rear end side in the groove are closed.
Of the two types of grooves 12b and 12b ', the shallower formed slide groove 12b' can be omitted. However, in a preferred example of the present embodiment, the two types of grooves 12b and 12b are omitted. By forming ', the assemblability when assembling the operation unit 20 in the middle piece 10 is improved. That is, when the shallower slide groove 12b ′ is omitted, the protrusion 22 of the operation unit 20 needs to be aligned with the deeper slide groove 12b. In the present embodiment, it is possible to engage the protrusion 22 with any of both the grooves 12b and 12b ′, thereby eliminating the troublesomeness in assembling due to the alignment.
[0022]
The rotor 30 includes a cylindrical portion 32 and an engaging portion 31 integrally formed on the outer periphery of the cylindrical portion 32, and the rear end side of the cylindrical portion 32 is slidably inserted into the operation unit 20. The front end side of the cylindrical portion 32 is slidably inserted into the receiving member 50.
The cylindrical portion 32 and the engaging portion 31 may be configured separately. In this case, the engaging portion 31 is engaged with the outer peripheral surface of the cylindrical portion 32 so as not to move forward at least. That's fine.
[0023]
The cylindrical portion 32 is formed with a refill mounting portion 33 on the inner peripheral surface thereof for releasably holding the rear end side of the refill 80 of the retractable writing instrument A, and the refill 80 has a substantially full length. The rear end side is inserted.
In the figure, reference numeral 32a denotes a vent hole formed in the rear end surface of the cylinder portion 32. The vent hole 32a is a hole for ensuring ventilation between the inside and the outside of the refill 80 mounted in the cylinder portion 32. In order not to penetrate the refill 80, the inner diameter is smaller than the outer diameter of the refill 80.
[0024]
The refill mounting portion 33 forms a plurality of vertical ribs on the inner peripheral surface of the cylindrical portion 32, and holds the refill 80 in a detachable manner by bringing the protruding end surface of the vertical rib into contact with the outer peripheral surface of the refill 80. Any other technical means may be used as long as the refill 80 can be mounted.
[0025]
Further, the engaging portion 31 of the rotor 30 is disposed on the rear side of the receiving member 50 described later (upper end surface in FIG. 1) and a ring portion 31b that can be brought into contact with the rear end surface of the receiving member 50. A plurality of protrusions 31a respectively engaged with the plurality of slide grooves 12b of the intermediate piece 10 are formed, and further, a rotor cam slope 31a1 is formed on the rear end surface of each protrusion 31a.
[0026]
The biasing member 40 is a compression spring according to a preferred example of the present embodiment. The biasing member 40 is received by engaging a seating surface on one end thereof with a receiving member 50 described later, and a seating surface on the other end. The receiving member 50 is mounted in the receiving member 50 in a state positioned inward (downward in FIG. 1) from the rear end surface of the receiving member 50.
When the urging member 40 is engaged with the middle piece 10 while being attached to the receiving member 50, the seat surface on the other end side is used as the front end surface of the cylindrical portion 32 of the rotor 30. The rotor 30 is abutted and urged backward.
[0027]
The receiving member 50 has a substantially cylindrical shape in which the urging member 40 is inserted from the rear end opening 53, and climbs over the plurality of protrusions 11b of the middle piece 10 on the rear end side of the outer peripheral surface thereof. An annular protrusion 51 for fitting is formed, and further, an annular protrusion for contacting the front end surface of the middle piece 10 at a position farther to the front end side of the dimension W2 than the annular protrusion 51 on the outer peripheral surface. A portion 52 is formed.
The front end opening 54 of the receiving member 50 is formed to have an inner diameter that allows the refill 80 to pass therethrough and does not penetrate the biasing member 40 inserted from the rear end opening 53.
A plurality of protrusions 55 are formed in the circumferential direction on the inner side of the stepped portion 54a formed by the front end opening 54 to fit the seating surface of the urging member 40 from the periphery thereof.
[0028]
Therefore, the urging member 40 inserted into the receiving member 50 is fixed by being received by the stepped portion 54a at the front end seating surface and being fitted by the protrusion 55 from the periphery.
Therefore, since the urging member 40 is not easily detached from the receiving member 50, a large number of parts formed by mounting the urging member 40 in the receiving member 50 are accommodated in the same part case. In this case, the urging members 40 are not entangled with each other, and parts management is easy.
[0029]
In addition, the receiving member 50 is set such that the dimension W2 between the two annular protrusions 51 and 52 is wider than the dimension W1 between the front end surface of the intermediate piece 10 and the protrusion 11b.
For this reason, the receiving member 50 can slide in the axial direction by the difference between the dimension W2 and the dimension W1 with respect to the middle piece 10 in a state where the annular protrusion 51 is fitted over the projection 11b of the middle piece 10. It becomes.
Therefore, when a large number of receiving members 50 and intermediate pieces 10 are produced, even if a dimensional variation occurs in one or both of the dimensions W1 and W2, the dimensional variation is absorbed by the sliding of the receiving member 50. Therefore, the assembly of the receiving member 50 and the middle piece 10 can be ensured.
[0030]
Further, when the refill advance / retreat unit 1 is mounted on the annular protrusion 61 of the retractable writing instrument A, the axial dimension variation of the axial tube 60 in the retractable writing instrument A, for example, the axial position of the annular protrusion 61 And the variation in the axial position of the stepped portion 63 with which the annular protrusion 52 of the receiving member 50 abuts are absorbed by the slide of the receiving member 50 (the slide of the difference between the dimension W2 and the dimension W1). Assembly of the refill advance / retreat unit 1 and the shaft cylinder 60 can be ensured.
[0031]
Each member having the above-described configuration is efficiently provided in the middle piece 10 from the front side of the middle piece 10 with the operation unit 20, the rotor 30, and the receiving member 50 in which the biasing member 40 is previously incorporated. By being inserted in order, it constitutes an advancing / retracting mechanism with an integral structure that can be operated independently.
Next, a mechanism (mechanism) in which the rotor 30 in the refill advance / retreat unit 1 moves forward / backward between the reverse position and the forward position will be described in detail.
[0032]
In the retracted position, the rotor 30 urged rearward by the urging member 40 brings the ridge 31a into contact with the operation portion cam inclined surface 21 of the operation portion 20, and the operation portion 20 has the ridge 22. Is brought into contact with the rear end surface in the slide groove 12b (or 12b ′), the movement of the rotor 30 and the operation unit 20 to the rear is restricted.
When the operation unit 20 moves forward by a knock operation while the rotor 30 is in the retracted position (see FIG. 2A), the rotor 30 resists urging by the urging member 40 with the advancement. Then move forward.
The forward movement of the rotor 30 and the operation unit 20 is restricted from moving forward by bringing the ring portion 31 b of the rotor 30 into contact with the rear end surface of the member 50.
In addition, the arrow shown with a dashed-two dotted line in FIG. 2 has shown the direction where the rotor 30 moves next.
[0033]
After the rotor 30 has advanced from the slide groove 12b, the rotor cam slant surface 31a1 is slid on the operation unit cam slant surface 21 while being urged rearward (upward in FIG. 2) by the urging member 40. It rotates (see FIG. 2B).
[0034]
Further, the rotor 30 rotates by sliding the rotor cam slope 31a1 to the middle piece cam slope 12c, and then is locked between the two adjacent middle piece cam slopes 12c and 12c, so that the advance position is increased. Maintain (see FIG. 2C).
[0035]
When the operation unit 20 moves forward again by the knocking operation, the rotor 30 that moves forward with the advancement removes the rotor cam inclined surface 31a1 from the locked state, and the rotor cam inclined surface 31a1 is moved to the operation unit cam inclined surface. It rotates by sliding to 21 (refer FIG.2 (d)).
Further, the rotor 30 continues to rotate by sliding the rotor cam inclined surface 31a1 on the operation portion cam inclined surface 21, and then retracts by engaging the rotor cam inclined surface 31a1 in the slide groove 12b, thereby returning to the original retracted position. (State of FIG. 2A).
[0036]
Next, the retractable writing instrument A to which the refill advance / retreat unit 1 configured as described above is attached will be described (see FIGS. 3 and 4).
The retractable writing instrument A includes a refill 80 slidable in the axial direction in a shaft cylinder 60 formed by screwing a front shaft 60 a and a rear shaft 60 b, and the writing tip of the refill 80 at the tip of the shaft tube 60. The front opening 60c for projecting and retracting the portion 81 is screwed and connected, and the refill advance / retreat unit 1 having the above-described configuration is fitted and connected to the rear end opening of the shaft tube 60.
[0037]
In addition, a grip 60d that improves the grip feeling of the retractable writing instrument A is fitted to the outer peripheral surface of the front shaft 60a.
A plurality of recesses 60d1 are formed in the circumferential direction on the outer peripheral surface of the grip 60d. The recess 60d1 improves the design of the retractable writing instrument A and makes it easy to confirm the front-rear direction of the grip 60d when the retractable writing instrument A is assembled.
[0038]
On the inner peripheral surface on the rear end side of the shaft tube 60, there are an annular protrusion 61 that fits over and fits the annular protrusion 11 a of the intermediate piece 10, a step 63 that abuts the annular protrusion 52 of the receiving member 50, and the like. In addition, a notch 62 is formed on the peripheral wall of the rear end portion to engage the detent projection 11c of the middle piece 10.
[0039]
Thus, according to the retractable writing instrument A configured as described above, the work of assembling the advance / retreat mechanism to the shaft cylinder 60 is an extremely simple work of fitting the refill advance / retreat unit 1 assembled in advance to the shaft cylinder 60. can do.
The technical means for mounting the refill advance / retreat unit 1 to the shaft cylinder 60 is not limited to the above-described fitting structure. For example, a male screw portion is formed in the front portion 11 of the middle piece 10. The anti-rotation protrusion 11c may be omitted, and a female screw portion may be formed on the inner peripheral surface of the rear end side of the shaft tube 60 so that the middle piece 10 and the shaft tube 60 are screwed together.
[0040]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
Since constituting an advance withdrawal mechanism alone actuatable integrated structure, also the barrel of the refill advancing and retreating unit slide type writing tool in a state of separate, performs operation confirmation test of the refill advancing and retreating unit be able to.
Therefore, for example, even if an operation failure is found by the operation check inspection, only the refill advance / retreat unit with the operation failure can be discarded and components other than the non-defective refill advance / retreat unit can be used as they are. The amount can be greatly reduced.
In addition, the refill advance / retreat unit has a refill advance / retreat mechanism, which is the part that takes the most time to assemble, as a single completed product separate from the shaft cylinder of the retractable writing instrument. By separately assembling and storing separately, it is possible to facilitate the management of parts in the retractable writing instrument.
Further, the assembly work of the retractable writing instrument can be a simple work of mounting the refill advance / retreat unit on the shaft cylinder, so that the assembly by the automatic assembly machine can be easily performed and the parts to be supplied to the automatic assembly machine The number of man-hours during the assembly can be reduced, and the productivity of the retractable writing instrument can be greatly improved.
Furthermore, the refill advance / retreat unit of the present invention is configured separately from the portion other than the refill advance / retreat unit in the retractable writing instrument. Therefore, it is possible to easily change the design of the shaft cylinder in the retractable writing instrument, change the name of the shaft cylinder in the retractable writing instrument, and change the specifications of the parts other than the refill advance / retreat unit in the retractable writing instrument. .
[0041]
Further, since the person the refill advancing and retreating unit has to be mounted to the rear end of the barrel of the retractable writing implement, on the mounting work is easier, the refill infested in infested writing instrument, after the operation of the good barrel This can be done by operating the end.
[0042]
Furthermore , since the refill advance / retreat unit is integrally provided with an urging member that is difficult to perform part management and assembly work to the shaft cylinder compared to other parts, the retractable type in which the refill advance / retreat unit is mounted Parts management and productivity in writing instruments can be further improved.
That is, when the urging member is, for example, a coil spring, it is entangled with other coil springs, is easily bounced when dropped, is easily detached or deformed during assembly work, etc. According to the present invention, the assembling work of the retractable writing instrument is performed by attaching the refill advance / retreat unit integrally provided with the biasing member to the shaft tube. Therefore, the problem due to the urging member alone can be reduced.
[0043]
Furthermore, even resulted in the axial direction of the dimensional variations in either or both of the accepted member and the middle piece, it is absorbed by the sliding of the dimensional variation is receiving member, ensuring the assembly of the middle and those receiving member piece Can be. In addition, when the refill advance / retreat unit is attached to the shaft cylinder of the retractable writing instrument, the refill advance / retreat unit and the shaft cylinder are absorbed by the slide in the axial dimension variation of the shaft cylinder of the retractable writing instrument. Can be reliably assembled.
Further, according to the configuration in which the front end of the urging member is fitted and fixed by the receiving member, the urging member is not easily detached from the receiving member. Even if many parts are housed in the same parts case, the urging members do not entangle with each other, and parts management is easy.
[0044]
Furthermore, in the configuration in which parts of the middle frame is assembled in order from the same direction, the assembling work of the refill advancing and retracting unit, and the assembly of the refill advancing and retreating unit can be facilitated by an automatic assembly machine, thus, the Productivity of the retractable writing instrument equipped with the refill advance / retreat unit can be further improved.
In addition, when the refill is mounted on the refill mounting portion, the rear end portion of the refill is included over substantially the entire length of the knock body projecting rearward, so that the refill size is relatively long to secure a large amount of ink. The total length of the retractable writing instrument to which the refill advance / retreat unit is attached can be shortened.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an example of a refill advance / retreat unit according to the present invention, showing a state in which a middle piece is cut in half, and a main part of a receiving member is cut away.
FIG. 2 is a development view sequentially showing a mechanism for moving a rotor forward and backward in the refill advance / retreat unit.
FIG. 3 is a side view showing an example of a retractable writing instrument equipped with the refill advance / retreat unit.
FIG. 4 is an enlarged cross-sectional view showing the structure of the rear end side of the writing tool.
[Explanation of symbols]
10: Nakakoma 20: Operation part 30: Rotor 32: Tube part 33: Refill mounting part 40: Biasing member 50: Receiving member 60: Shaft cylinder A: Retractable writing instrument

Claims (3)

A refill advance / retreat unit equipped with an advance / retreat mechanism for advancing / retreating the refill mounting portion in the axial direction by operating the operation unit
The advancing / retreating mechanism includes a rotor having the refill attachment portion, a biasing member that biases the rotor rearward, and a slidable inner part of the rotor that is slidable in the axial direction. The rotor includes a middle piece that can be attached to an end portion, and a receiving member that receives the biasing member on a front side thereof, and the rotor is resisted against biasing by the biasing member when the operation portion is knocked. It can be operated independently so that it can be moved forward and locked to the middle piece, and when the operation part is knocked again, the locked state is released and the refill attachment part is moved backward. It is configured as an integral structure
The refill advance / retreat unit is characterized in that the receiving member engages with the middle piece so as to be slidable in the axial direction and projects forward of the middle piece . The receiving member has a substantially cylindrical shape in which the urging member is inserted from a rear end opening, and the front end of the urging member is fitted and fixed by a protrusion formed on the inner peripheral surface thereof. refill advancing and retracting unit according to claim 1, wherein the are. The reciprocating mechanism is in the in frame, from the front side of the middle piece, and the operation portion, and the upper Symbol rotor, and the receiving member internalized the biasing member so as to urge the rotor backward but while being configured to be inserted in order, by the operation unit is knocking operation, the rotor is rotated after advancing in the axial direction in the locking state, the operating portion is again It is a mechanism for releasing the locking state and retracting the rotor by being knocked,
The operation unit, together with a pushing member which is knocking operation from the rear, according to claim 1 or 2, characterized in that it is configured to inherent rear end of the refill over substantially the entire length of the pushing member Refill advance / retreat unit.

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