JP5084047B2 - Shaft tube connection structure - Google Patents

Description

  The present invention relates to a shaft cylinder connection structure in which a shaft cylinder includes a front shaft cylinder and a rear shaft cylinder, and the front shaft cylinder and the rear shaft cylinder can be detachably connected via a joint member.

  Some writing instruments have a structure in which a shaft cylinder is composed of a front shaft cylinder and a rear shaft cylinder so that the front shaft cylinder and the rear shaft cylinder can be detachably connected. For example, a fountain pen or the like having a front shaft cylinder with a pen attached to the tip and a rear shaft cylinder (also referred to as a cylinder shaft) that accommodates an ink cartridge or the like.

  In order to allow the front shaft barrel and the rear shaft barrel to be detachably connected, a structure in which a screw portion provided in the front shaft barrel and a screw portion provided in the rear shaft barrel are screwed together is generally used. However, recently, there is a structure in which a coupling member having a flange portion projecting outward is interposed between a front shaft barrel and a rear shaft barrel and connected. For example, a joint member having a flange portion protruding outward is screwed into a male screw portion provided at a front portion of the flange portion with a female screw portion provided at the rear end portion of the front shaft cylinder, and the front portion is formed by an adhesive. A structure in which the front shaft cylinder and the rear shaft cylinder are detachably connected by screwing the female screw section provided at the front end portion of the rear shaft cylinder to the male screw section provided at the rear part from the flange portion, fixed to the shaft cylinder. belongs to.

  Japanese Utility Model Laid-Open No. 56-98484 discloses an inner threaded portion (female thread) of a joint (joint member) 8 to an outer threaded portion (male threaded portion) 6 of a front shaft tube 3 having a fitting ring 13 attached to a rear end portion. Part) 9 is screw-fitted, and the fitting ring 13 is pressure-bonded, and the internal thread part 16 provided at the tip part of the rear barrel 15 is screwed to the external thread part (male thread part) 12 of the joint 8. A connecting structure of the shaft cylinder is disclosed.

  In the connection structure as described above, a flange portion is provided to which the tip of the rear shaft tube abuts when the female screw portion provided in the rear shaft tube is screwed into the male screw portion provided in the joint member. Although such a flange portion has a decorative meaning, it has a role as a stopper for screwing when the rear shaft tube or the front shaft tube is screwed to the joint member, and the joint member is generally formed of metal. It is.

By the way, some shaft cylinders are made of metal, and in order to tighten the front shaft cylinder or the rear shaft cylinder to the joint member many times and tighten it, the end surface of the front shaft cylinder or the rear shaft cylinder is the joint member. There was a problem that the flange portion of the joint member was damaged at the end face of the front shaft barrel or the rear shaft tube by rotating abutting the flange portion many times.
Japanese Utility Model Publication No. 56-98484

  The present invention relates to a metal joint member having a flange portion projecting outwardly, wherein the shaft barrel is composed of a front shaft barrel and a rear shaft barrel, so that the flange portion is exposed outwardly. Alternatively, a male screw that is fixed to the rear shaft cylinder and that has at least a metal rear shaft cylinder or an inner member having a female thread portion formed of resin inside the front shaft cylinder, and the female screw of the inner member is formed as a joint member In the shaft tube connection structure in which the front shaft tube and the rear shaft tube are detachably connected by being screwed to the portion, at least the metal front shaft tube or the rear shaft tube is screwed to the joint member. When tightened, the flange portion of the joint member is not damaged.

The present invention
“1. A shaft tube is composed of a front shaft tube and a rear shaft tube, and a metal joint member having a flange portion projecting outward is connected to the front shaft tube or the flange portion so that the flange portion is exposed to the outside. A male threaded portion that is fixed to the rear shaft cylinder, and that has at least a metal rear shaft cylinder or an inner member having a female thread portion formed of resin inside the front shaft cylinder, and has a female thread of the inner member formed on a joint member In the shaft tube connection structure in which the front shaft tube and the rear shaft tube are detachably connected by being screwed together, the flange portion of the rear shaft tube or the joint member of the front shaft tube is connected to the inner member. A front end located in contact with the opening end surface on the side, an annular recess for fitting the front end into the flange portion of the joint member, and a female thread portion of the inner member screwed into the male thread portion of the joint member When tightened, the tip of the inner member fits into the recess in the flange of the joint member Coupling structure of the barrel, characterized in that it is coated with a flange portion. "
It is.

  Since the present invention has the structure as described above, the female threaded portion of the metal rear shaft tube or the front shaft tube is screwed into the male threaded portion of the metal joint member fixed to the front shaft tube or the rear shaft tube. Even when tightened, the front end portion of the resin inner member provided on the rear shaft cylinder or the front shaft cylinder abuts on the flange portion of the joint member, so there is no possibility of damaging the flange portion. Further, when the front shaft cylinder and the rear shaft cylinder are connected, the resin tip is hidden by the metal joint member, so that the resin is interposed between the metal joint member and the metal rear shaft cylinder. There is no change in color and material feeling due to the presence of, and there is no possibility of causing a sense of incongruity in design.

  Resin made of resin having a female threaded portion with a front end positioned in contact with the opening front end surface inside a metal front shaft cylinder or rear shaft cylinder that is detachably screwed into the threaded portion of the flange section The inner member is fixed. The flange portion of the joint member is provided with a recess into which the tip end portion of the inner member can be fitted.

  This embodiment will be described with reference to the drawings. In the present embodiment, a description will be given by taking a fountain pen as a fountain pen composed of a front shaft cylinder having a metal nib at the tip and a rear shaft cylinder containing an ink cartridge. It is not limited to the connection structure of the shaft cylinder in.

  As shown in FIG. 1, the front barrel 1 of the fountain pen of the present embodiment is formed by integrally forming a pen tip 3 having a slit 2 on a tapered tip 1 a, which is a conventionally known structure. The structure is such that an inner cylinder 5 formed of resin is bonded to the provided metal front shaft body 4. A pen core 7 having a comb groove 6 is disposed inside the front shaft cylinder 1 like a conventional fountain pen, and an ink cartridge (not shown) is coupled to the rear of the pen core 7. A connector 10 having a small-diameter coupling portion 8 and a projecting piece 9 for opening a closing plate of the ink cartridge is disposed. An O-ring 11 for preventing ink leakage is interposed between the front end surface 10a of the connector 10 and the wall surface of the pen core 7. An internal thread portion 12 is provided at the rear end portion 5 a of the inner cylinder 5.

  As shown in FIG. 2, a metal pipe-shaped joint member 14 having a flange portion 13 protruding outward at a substantially central portion has a front portion 14 a positioned on the front shaft tube 1 side from the flange portion 13. A male screw part 15 that can be screwed into the female screw part 12 is provided, and a male screw part 16 is provided in a rear part 14b of the flange part 13 opposite to the front part 14a. A concave groove 18 is provided circumferentially on the end surface 17 of the flange portion 13 on the rear portion 14b side. The joint member 14 is disposed at the rear end portion 1b of the front shaft tube 1 by screwing the male screw portion 15 into the five female screw portions 12 of the inner cylinder and further bonding them. A decorative ring body 19 is disposed on the front portion 14 a from the flange portion 13, and is fixed by being sandwiched between the rear end of the front shaft tube 1 and the flange portion 13.

  As shown in FIGS. 3 and 4, an inner member 21 made of resin is fixed inside the metal rear barrel 20 with an adhesive. The inner member 21 is provided with a ring-shaped distal end portion 22 formed in a front end in contact with the opening end surface 20a of the rear barrel 20 and having a diameter substantially equal to the outer diameter of the opening end surface 20a. On the inner peripheral surface of the inner member 21, a female screw portion 23 that can be screwed into the male screw portion 16 provided in the rear portion 14b of the flange portion 13 of the joint member 14 is provided.

  As shown in FIG. 5, the internal thread 21 of the inner member 21 fixed to the rear shaft cylinder 20 is connected to the external thread section 16 provided at the rear portion 14 b of the flange section 13 of the joint member 14 fixed to the rear end of the front shaft cylinder 1. By screwing the portion 23, the front shaft cylinder 1 and the rear shaft cylinder 20 can be detachably connected, but the female screw portion 23 of the inner member 21 is screwed and tightened to the male screw portion 16 of the joint member 14. The opening end surface 22a of the tip 22 of the inner member 21 is in contact with a wall 18a that is fitted in the recess 18 provided in the flange 13 of the joint member 14 and is erected in the longitudinal direction of the recess 18. The portion 22 is covered with the flange portion 13.

  The connecting structure of the writing tube of the writing instrument of the present invention is a knock type or a rotating type in a ballpoint pen or the like when connecting a front shaft tube having a pen tip and a pen core in a fountain pen and a rear shaft tube containing an ink cartridge. It can be used when connecting the rear shaft cylinder having a feeding mechanism such as a front shaft cylinder containing a ballpoint pen refill or the like. The present invention can also be used as a connecting structure for detachably connecting two shaft cylinders other than the writing instrument.

It is a longitudinal cross-sectional view of the front axial cylinder which comprises the Example of this invention. In FIG. 1, it is a longitudinal cross-sectional view of the joint member fixed to the front shaft cylinder. It is a longitudinal cross-sectional view of the rear shaft cylinder constituting the embodiment of the present invention. In FIG. 2, it is a longitudinal cross-sectional view of the inner member fixed to the rear shaft tube. It is the longitudinal cross-sectional view which showed the state which connected the front axial cylinder and the rear axial cylinder which show the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front shaft cylinder 13 Flange part 14 Joint member 15, 16 Male thread part 18 Recess 18a Wall surface 20 Rear shaft cylinder 21 Inner member 22 Tip part 23 Female thread part

Claims (1)

  The shaft tube is composed of a front shaft tube and a rear shaft tube, and a metal joint member having a flange portion protruding outward is connected to the front shaft tube or the rear shaft tube so that the flange portion is exposed to the outside. The inner member having an internal thread portion formed of resin is fixed inside at least the metal rear shaft cylinder or the front shaft cylinder, and the internal thread of the inner member is screwed into the male thread portion formed on the joint member. Thus, in the connecting structure of the shaft cylinder in which the front shaft cylinder and the rear shaft cylinder are detachably connected to each other, the inner member becomes the flange portion side of the rear shaft cylinder or the joint member of the front shaft cylinder. A front end portion that is in contact with the opening end face is provided, an annular concave portion for fitting the front end portion is provided in the flange portion of the joint member, and the female screw portion of the inner member is screwed into the male screw portion of the joint member and tightened. The tip of the inner member is inserted into the recess of the flange of the joint member. Coupling structure of the barrel, characterized in that it is coated with di-section.

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