JP2013052633A - Mounting structure of pressing operation part, tail plug, and shaft tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that when an engaging part of a stick holder is arranged in the guide slit under the projection, and when a projection of the guide cylinder and an annular concave part of the outer cylinder are pressed and fitted, an engaging part of the stick holder inhibits the deflection to the center direction of the guide slit, and damages the outer cylinder and the guide cylinder, and generate cracks as a result.SOLUTION: There is provided a mounting structure of a pressing operation part, a tail plug, and a shaft tube. In the mounting structure of the pressing operation part, the tail plug, and the shaft tube, the pressing operation part is mounted to the tail plug movable anteroposteriorly, while forming an elastic changeable locking projection to the pressing operation part, a through-hole to engage the locking projection is formed in the tail plug, and a press fitting projection is formed near the through-hole of the tail plug, and moreover, the pressing operation part is biased toward the rear side by the resilient member.

Description

  The present invention relates to a mounting structure for a pressing operation portion, a tail plug, and a shaft tube.

  As an example, the rod-shaped object feeding container is inserted into the outer cylinder, rotatably inserted into the outer cylinder, having a guide slit extending in the axial direction, and inserted into the guide cylinder, and slidable into the guide slit. A rod-shaped object holder that holds the rod-shaped object, and a screw part that converts the relative rotation between the outer cylinder and the guide cylinder into an axial movement of the rod-shaped object holder. There is a stick-shaped object feeding container. As a means for press-fitting the outer cylinder and guide cylinder of the rod-like object feeding container, the guide cylinder is inserted from the rear of the outer cylinder, the rear end of the outer cylinder and the rotary knob portion are brought into contact with each other, and the protrusion of the outer cylinder Are assembled by engaging a projection and an annular recess provided at a position facing each other.

10-184

  In the above prior art, when the protrusion of the guide tube and the annular recess of the outer tube are press-fitted, if the engaging portion of the rod-shaped object holder is disposed in the guide slit under the protrusion, the rod-shaped object The engaging portion of the holder obstructs the bending of the guide slit toward the center. As a result, the projection of the guide cylinder does not reach the annular recess of the outer cylinder, resulting in poor press-fitting, or the annular recess of the outer cylinder, the projection of the guide cylinder, or the projection of the guide cylinder is the rear end of the outer cylinder at the press-fitting start location. There is a possibility that a load is applied to the portion from the portion until it reaches the annular recess at the press-fitting completion location, and the outer cylinder or the guide cylinder may be damaged or a crack may occur.

  The present invention is a mounting structure of a pressing operation portion, a tail plug, and a shaft tube, and the pressing operation portion is attached to the tail plug so as to be movable back and forth, and a locking projection capable of elastic change is formed on the pressing operation portion. On the other hand, the tail plug is formed with a through-hole that engages with the locking projection, and a press-fitting projection is formed in the vicinity of the through-hole of the tail plug, and the pressing operation portion is repelled. The gist is that the member is biased backward.

  The present invention is a mounting structure of a pressing operation portion, a tail plug, and a shaft tube, and the pressing operation portion is attached to the tail plug so as to be movable back and forth, and a locking projection capable of elastic change is formed on the pressing operation portion. On the other hand, the tail plug is formed with a through-hole that engages with the locking projection, and a press-fitting projection is formed in the vicinity of the through-hole of the tail plug, and the pressing operation portion is repelled. Since the member is urged rearward, the through hole is sufficiently bent, and the shaft tube and the tail plug can be prevented from being damaged or cracked.

The external view which shows a 1st example. The longitudinal cross-sectional view of FIG. FIG. The longitudinal cross-sectional view of FIG. FIG. 5 is a cross-sectional view of FIG. 4. FIG. 4 is a left side vertical sectional view of FIG. 3. The longitudinal cross-sectional perspective view of a press operation member and a tail plug. The external view of a press operation member and a tail plug. The longitudinal cross-sectional view of FIG. The longitudinal cross-sectional view which isolate | separated the front axis set and the rear axis set. The rear end detail drawing of the longitudinal cross-sectional view of FIG. Part D detail view of FIG. External view of rear axle set. The longitudinal cross-sectional view of the rear-axis set which shows a 2nd example. The exploded external view of FIG.

A first example will be described with reference to FIGS. This is a so-called retractable writing instrument in which a ball-point pen body is disposed in the shaft body and the ball-point pen body is disposed so as to be able to retract. A relatively soft resin material (soft member 2) is coated on the surface of the shaft tube 1 formed of a relatively hard resin material and gripped. As an example of a relatively hard resin material forming the shaft tube 1, polycarbonate is used in this example, but polyethylene terephthalate, acrylic, acrylonitrile butadiene styrene copolymer (ABS), acrylonitrile styrene copolymer Examples include coalescence (AS) and polypropylene. In order to improve the stability of a ballpoint pen body to be described later on the inner surface of the shaft tube 1, protrusions, vertical ribs, and the like may be formed radially on the inner surface of the shaft tube 1. Moreover, as a comparatively soft resin material which forms the soft member 2, although the thermoplastic elastomer is used in this example, soft acrylic etc. are mentioned.
The tail plug 3 is detachably attached to the rear end opening of the shaft tube 1 by a screwing means, but may be a fixing means using a press-fitting structure. A shaft body 4 is constituted by the shaft tube 1, the soft member 2, and the tail plug 3, and the vicinity of the tip of the shaft tube 1 is tapered toward the tip. The length of the shaft tube 1 in the longitudinal direction is three times or more that of the tail plug 3. That is, the attachment portion between the shaft tube 1 and the tail plug 3 is a rear portion of the soft member 2 that is a gripping portion. By providing it behind the part which holds each other's screwing part (attachment part), while preventing breakage from a screwing part, the mutual member is prevented from loosening. Incidentally, if the screwed part is gripped, that is, if it is positioned in the vicinity of the center of the shaft cylinder, there is a risk that the gripping force and writing pressure concentrate on the gripped part and break from the part. By forming the screw portion, the portion is in a thin state, so that it is easy to break. Further, if a gripping force is applied to the screwed portion, a force is also applied in the circumferential direction. As a result, the members are loosened, and writing feels uncomfortable. Further, inside the shaft body 4, the ball-point pen body 5 is disposed in a state of being urged rearward by an elastic member 6 such as a coil spring, but is moved back and forth with respect to the longitudinal direction of the shaft body 4. The tip of the ball-point pen body 5 (the ball-point pen tip 7) can be projected and retracted from the tip opening of the shaft body 4. The elastic member 6 is stretched between an outer surface step portion 5 a provided in front of the ballpoint pen body 5 and an inner surface step portion 1 a formed in front of the shaft cylinder 1. The elastic member 6 uses a coil spring in this example, but may be a rubber, a resin spring, an elastomer, or the like.

Further, the vicinity of the rear end of the ball-point pen body 5 is located inside the shaft cylinder 1 while the elastic member 6 is compressed in a state where the tail plug 3 is screwed to the shaft cylinder 1. In a state where the stopper 3 is detached, the elastic member 6 is extended, and the vicinity of the rear end of the ballpoint pen body 5 is exposed from the rear end opening of the shaft tube 1. That is, the distance obtained by adding the distance A from the outer surface step portion 5a of the ballpoint pen body 5 to the rear end portion of the ballpoint pen body 5 and the free length distance B of the elastic member 6 is from the inner surface step portion 1a of the shaft tube 1 to the shaft tube. On the other hand, a rotor 8 is disposed inside the tail plug 3 so as to be movable back and forth, and slides behind the rotor 8. The child 9 is also arranged to be movable back and forth, but the vicinity of the rear end of the slider 9 is exposed from the rear end opening of the tail plug 3, and the exposed portion serves as the pressing operation portion 10. . That is, when the pressing operation portion 10 of the slider 9 is pressed back and forth with a finger or the like, the ball-point pen body 5 in the shaft body 4 moves back and forth, whereby the ball-point pen tip 7 moves from the tip opening of the shaft body 4. It will appear. In addition, the rotor 8 is positioned substantially at the center of the tail plug 3, and the lower end surface of the rotor 8 is in contact with the rear end of the ballpoint pen body 5. Note that claw portions 8a are formed on the edge portion of the rotor 8 at four positions at equal intervals in the downward direction. The claw portions 8a are successively reduced in the rear and inward directions. doing. By causing the cylindrical portion 8 a to inscribe the rear end portion of the ball-point pen body 5, shake and eccentricity at the rear end portion of the ball-point pen body 5 are prevented. That is, the rear end portion of the ball-point pen body 5 is also located at the substantially central portion of the tail plug 3.
Reference numeral 11 denotes a clip integrally formed with the tail plug 3, but it may be formed of a separate member and fixed to the tail plug 3 by means such as adhesion or press fitting.

The soft member 2 covers a recess 1b formed in a portion gripped by the shaft tube 1, and the shaft tube 1 and the soft member 2 are formed as separate members, and the soft member 2 is the shaft tube. Although it is in a state of being inserted into 1, it may be integrally molded by means such as two-color molding. And the wave-shaped grip part 12 which has fine height is formed in the surface of the front part of the soft member 2, However, A plain shape may be sufficient or many dots are formed etc. You may do it. The soft member 2 can be easily inserted by applying alcohol to the inner surface of the soft member 2 or the surface of the shaft tube 1. And after inserting, the applied alcohol evaporates.
An internal thread 13 to which the tail plug 3 is screwed is formed on the inner surface of the rear portion of the shaft tube 1.

The tail plug 3 is composed of a large-diameter cylindrical portion 14 to which the base of the clip 11 is connected and a small-diameter cylindrical portion 15 formed in front of the large-diameter cylindrical portion 14. The portion 15 is formed with a male screw 16 and a guide tube portion 17 that are screwed into the female screw 13 of the shaft tube 1.
Here, a ball portion 11 a is formed in the front portion of the clip 11, and the ball portion 11 a is in contact with the surface of the shaft tube 1. That is, when a notebook, a pocket or the like is sandwiched between the clip 11 (ball portion 11a), it is difficult to come off.
Further, arc portions 11b are formed on both sides of the ball portion 11a. When replacing the ball-point pen body 5, the tail plug 3 is detached from the shaft body 4. At this time, since the tail plug 3 and the shaft body 4 are relatively rotated, the surface of the soft member 2 is formed by a ball portion 11a. There is a high risk of sliding scratches. In order to prevent the sliding scratches, arc portions 11b are formed on both sides of the ball portion 11a.

A jaw portion 18 for preventing the pressing operation portion 10 from falling off is formed at an intermediate portion of the inner surface of the tail plug 3, and the rear end surface of the jaw portion 18 is inclined downward toward the center. An inclined portion 18a is formed to facilitate insertion of the pressing operation portion 10 into the tail plug 3.
Further, a guide projection 19 is formed on the outer peripheral surface in front of the pressing operation portion 10, and the guide projection 19 is engaged with a notch portion 20 cut out in the axial direction of the jaw portion 18. By this engagement, the positioning of the pressing operation unit 10 with respect to the tail plug 3 is completed.
Here, when the pressing operation portion 10 is pushed into the tail plug 3, the locking projection 21 formed on the side surface of the pressing operation material 10 bends in the central direction so as to get over the jaw portion 18. However, when the locking projection 21 is engaged with the through hole 22 formed on the side surface of the small diameter cylindrical portion 15 of the tail plug 3, the return is elastically restored by its own restoring force at the moment of engagement. 22 is locked. This prevents the pressing operation unit 10 from falling off the tail plug 3.
The shape of the through hole 22 is a rectangle in this example, but may be an elliptical shape or a long hole shape having parallel inner sides facing each other.
Further, on the side surface of the guide projection 19, a fine uneven surface portion 19 a is formed. On the other hand, the inner surface of the notch 20 is a mirror surface 20a. The contact resistance is reduced as much as possible by bringing the matte portion 19a of the inner surface protrusion 19 into contact with the mirror surface portion 20a.

A cam portion 18b is formed on the front end surface of the flange portion 18, and the cam portion 18b includes a shallow groove portion 18c and a deep groove portion 18d. And the said notch part 20 is formed in the deep groove part 18d.
Below the inner surface of the tail plug 3, an inner surface rib 23 for preventing the rotor 8 from falling off is formed in a circumferential shape. A rear inclined surface 23a and a front inclined surface 23b are formed behind and in front of the inner rib 23, and the inclination angle of the rear inclined surface 23a is gentler than the inclination angle of the front inclined surface 23b. When the tail plug 3 is formed by means such as injection molding, the releasability of the core pin is made favorable.

Next, a procedure for inserting the elastic member 6 and the ball-point pen body 5 into the shaft tube 1 and a procedure for assembling the tail plug 3 will be described. First, assembly of the front shaft set α will be described. The elastic member 6 is inserted into the shaft tube 1 from the rear end opening, and then the front portion of the ballpoint pen body 5 is inserted from the rear end opening of the shaft tube 1 so as to be inserted into the elastic member 6 as well. At this time, the vicinity of the rear end of the ballpoint pen body 5 is exposed from the rear end opening of the shaft tube 1.
Next, assembly of the rear axle set β will be described. Thereafter, the shaft set β includes the tail plug 3, the pressing operation unit 10, and the rotor 8. The pressing operation unit 10 is press-fitted from the rear end opening of the tail plug 3 large-diameter cylindrical portion 14. At this time, the locking projection 21 formed on the side surface of the pressing member 10 is centered so as to get over the jaw portion 18. Bend in the direction. However, when the locking projection 21 reaches the through-hole 22 formed on the side surface of the small-diameter cylindrical portion 15 of the tail plug 3, it elastically recovers by its own restoring force at the moment of reaching the through-hole 22. Stop.
Next, a rotor is inserted into the front end opening of the small diameter cylindrical portion 15 of the tail plug 3, and an inner surface rib 23 of the rotor 8 is formed in a circumferential shape below the inner surface of the tail plug 3. Therefore, the rotor 8 can be prevented from dropping after insertion.
Next, assembly of the rear shaft set β and the front shaft set α will be described. In this example, an assembling method using an automatic assembling machine will be described, but it may be assembled by hand. When assembling by hand, it is difficult to press-fit all the screw portions having several turns. Therefore, the first male screw press-fitting protrusion 16b which is difficult to understand at the start of screwing is press-fitted first, and then screwing assembly is performed. Also in the automatic assembly machine, it is possible to press-fit the first male screw press-fitting protrusion 16b which is difficult to understand at the start of screwing, and then perform screwing assembly.

Generally, in an automatic assembling machine, since it is difficult to assemble screws, press-fitting means are often employed even if they are screwed. Also in this example, the press-fitting method is adopted, and as a press-fitting procedure, it is confirmed that the pressing operation unit 10 of the rear shaft set β is released, and press-fitting into the front shaft set α is started. At this time, in the state where the rear end portion of the ballpoint pen body 5 is exposed, most of the ballpoint pen body 5 is inserted into the shaft tube 1, and the center of gravity of the ballpoint pen body 5 is within the region of the shaft tube 1. Therefore, the ball-point pen body 5 is in a stable state without swinging with respect to the shaft tube 1. Therefore, the rear end portion of the ballpoint pen body 5 can be easily and straightly inserted into the guide tube portion 17 and can be brought into contact with the lower end surface of the rotor 8.
When the tail plug 3 is attached to the shaft tube 1, the rear end portion of the ballpoint pen body 5 is located inside the shaft tube 1. After the mounting, the rear end portion of the ball-point pen body 5 is positioned inside the shaft tube 1 so that the rotor 8 can be positioned inside the shaft tube 1 and the tail plug 3 can be formed short. Thereby, as described above, the screwing portion of each member can be positioned further rearward of the grip portion, and breakage of the shaft tube 1 and the tail plug 3 can be prevented.
Thereafter, when the rear shaft set β starts to be press-fitted into the front shaft set α, the locking projection of the pressing operation unit 10 urged rearward by the elastic member 6 via the ballpoint pen body 5 and the rotor 8. 21 is located at the rear end of the through hole 22 of the tail plug 3. As a result, the through-hole 22 is sufficiently bent and insufficient press-fitting is prevented, and the load on the shaft tube 1 is reduced. As a result, the shaft tube 1 and the tail plug 3 are also prevented from being cracked and can be safely press-fitted. Can do.

Further, in this embodiment, when the locking projection 21 of the pressing operation portion 10 urged rearward by the elastic member 6 is disposed at the rear end of the through hole 22 of the tail plug 3, the pressing operation is performed. The locking protrusion 21 of the portion 10 is positioned behind the male screw press-fitting protrusion 16 a of the tail plug 3. Accordingly, when the male screw press-fitting protrusion 16a of the tail plug 3 gets over the female screw engagement protrusion 13a of the shaft tube 1 during press-fitting, the through hole 22 of the tail plug 3 that is directly below the male screw press-fitting protrusion 16a of the tail plug 3 is provided. The shape is easy to bend. That is, when the locking projection 21 is disposed at the rear end of the through hole 22 of the tail plug 3, the locking projection 21 of the pressing operation unit 10 is disposed behind the male screw press-fitting projection 16 a of the tail plug 3. Thereby, the bending of the through-hole 22 is securable. Therefore, the through-hole 22 is sufficiently bent and insufficient press-fitting is prevented, and the load on the shaft tube 1 is reduced. As a result, the shaft tube 1 and the tail plug 3 are also prevented from being cracked and can be safely press-fitted. .
If the locking projection 21 of the pressing operation unit 10 urged rearward by the elastic member 6 is disposed directly below the male screw press-fitting projection 16a of the tail plug 3, the through hole 22 of the tail plug 3 is provided. There is a risk of hindering the bending of the.

Further, when the elastic member 6 is not inserted, the pressing operation portion 10 locking projection 21 is not urged rearward by the elastic member 6, the male screw press-fit protrusion 16 a of the tail plug 3 is pivoted. When getting over the female screw engaging protrusion 13a of the tube 1, the through hole 22 of the tail plug 3 may be bent, and the locking protrusion 21 of the pressing operation part 10 may be sandwiched between the inner surfaces of the through hole 22 of the tail plug 3. .
It should be noted that the press-fit amount a of the female screw engaging protrusion 13a of the shaft tube 1, the male screw press-fit protrusion 16a of the tail plug 3, the width b of the tail plug 1 through-hole 22, and the locking protrusion 21 width c of the pressing operation section 10 By forming the relationship as a ≦ b−c, the locking protrusion 21 of the pressing operation portion 10 is not sandwiched between the inner surfaces of the through holes 22 of the tail plug 3. Accordingly, insufficient press-fitting is prevented, and the load on the shaft tube 1 is reduced. As a result, the shaft tube 1 and the tail plug 3 are also prevented from being cracked and can be safely press-fitted.
If there are a plurality of protrusions that engage on the same radial line, the total is the press-fit amount a.

A second example will be described with reference to FIG. In this example, the elastic member 24 is stretched between the top surface of the pressing operation unit 10 and the rotor step 8b. Since the elastic member 24 is stretched between the top surface of the pressing operation unit 10 and the rotor step 8b, the pressing operation unit 10 is urged rearward. That is, the locking protrusion 21 of the pressing operation unit 10 is always located at the rear end of the through hole 22 of the tail plug 3.
As a result, it is possible to eliminate the work of confirming whether or not the pressing operation unit is released during assembly, and the number of assembly steps can be reduced. The elastic member 24 uses a coil spring in this example, but may be a rubber, a resin spring, an elastomer, or the like.

DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Resin material 3 Tail plug 4 Shaft body 5 Ball-point pen body 6 Repellent member 7 Ball-point pen tip 8 Rotor 9 Slider 10 Press operation part 11 Clip 12 Grip part 13 Female screw 14 Large diameter cylindrical part 15 Small diameter cylindrical form Part 16 Male thread 17 Guide tube part 18 Jaw part 19 Guide protrusion 20 Notch part 21 Locking protrusion 22 Through hole 23 Inner rib 24 Repellent member α Front shaft set β Rear shaft set

Claims (4)

The mounting structure of the pressing operation portion, the tail plug, and the shaft tube, and the pressing operation portion is attached to the tail plug so as to be movable back and forth, and the pressing operation portion is formed with a locking projection that can be elastically changed, A through hole that engages with the locking projection is formed in the tail plug, a press-fitting projection is formed in the vicinity of the through hole of the tail plug, and the pressing operation portion is rearwardly moved by an elastic member. Mounting structure of the pressing operation part, tail plug and shaft barrel that are biased toward. The attachment structure of the press operation part, tail plug, and shaft tube according to claim 1, wherein the locking protrusion is positioned behind the press-fitting protrusion. The relationship is a ≦ b−c, where a is the amount of press-fitting between the shaft cylinder and the tail plug, a is the width of the through hole of the tail plug, and b is the engagement protrusion width of the pressing operation portion. The attachment structure of the press operation part of Claim 1 or Claim 2, a tail plug, and a shaft cylinder. The attachment structure of the press operation part, tail plug, and shaft cylinder in any one of Claims 1-3 which connected the said tail plug and the shaft cylinder by screwing.

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