JP2012218228A - Fountain pen with double pen core structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure which prevents a pen body or pen core from coming off a holder cylinder and does not cause a writing failure due to deformation of an outer core, in a fountain pen with a double pen core structure.SOLUTION: A rib 31f horizontally provided between both inside walls 31e which form an ink groove 31c is formed in the ink groove 31c in a back insertion attachment part 3a of an outer core 31. A shallow groove 31g for connecting a front part 31j and a back part 31i of the ink groove 31c is formed above the rib 31f. When the back insertion attachment part 3a of the pen core 3 is pressed in a front opening part 4a of the holder cylinder 4, the width of the ink groove 31c of the outer core 3 is held by the rib 31f.

Description

  The present invention relates to a fountain pen having a double pen core structure in which a pen core is composed of an outer core and an inner core.

  Conventionally, the structure of a general fountain pen is such that the ink in the ink container provided in the shaft cylinder is supplied to the pen body by a pen core inserted in the front opening formed in front of the shaft cylinder. It has a structure in which writing can be performed at the writing end. In this structure, ink flows to the front of the pen core due to the capillary force of the ink circulation groove provided on the pen core, and the ink is moved forward of the pen body by the capillary force of the pen body adjacent to the upper side of the ink circulation groove. It can flow to the end of writing and can be written.

  There are various forms of the pen core structure, and among them, as disclosed in Japanese Utility Model Publication No. 31-6815 and Japanese Patent No. 2858740, a fountain pen that forms a double pen core with an outer core and an inner core. In this structure, since a path for inhaling ink is provided between the outer core and the inner core, the ink core was formed at the front end of the pen core with respect to the ink in the ink bottle at the time of ink inhalation. It is possible to inhale ink by immersing the ink flow passage and air passage, and the shaft is compared to a structure in which ink is immersed in the ink from the writing end to the tip of the shaft cylinder like a general pen core. Since the cylinder does not need to be stained, it is not necessary to wipe off the shaft cylinder soiled with ink each time ink is inhaled, and it is particularly suitable for a fountain pen with a transparent or light-colored cylinder that easily deposits ink color.

  By the way, as a method of attaching the pen body and the pen core to the shaft cylinder, as disclosed in Japanese Patent Application Laid-Open No. 2001-138585, a rear insertion portion in which the rear of the pen body and the pen core is extended is used as a pen body. A method is generally known in which a pen core overlaps with a pen core and is press-fitted into a front opening of a shaft cylinder. However, in the case of the above-described fountain pen with a double-pen core structure, this mounting method is formed in the outer core in the cross-sectional direction because the through hole for inserting the inner core into the outer core extends in the axial direction. Deformation is likely to occur, and when the pen body and pen core are press-fitted into the front opening of the shaft tube and fitted, the width of the ink groove provided in the outer core is narrowed, and the outflow of ink is worsened. There was a risk of failure. This phenomenon is particularly likely to occur in a structure in which a protrusion is provided on the lower surface of the outer core to increase the pressure input of the pen body and the pen core to the shaft cylinder. In addition, when the pressure input of the pen body and the pen core to the shaft cylinder is weakened to prevent the deformation of the outer core, another problem has arisen that the pen body and the pen core fall off from the shaft cylinder. It was.

Japanese Utility Model Publication No. 31-6815 Japanese Patent No. 2858740 Japanese Patent Laid-Open No. 2001-138585

  An object of the present invention is to provide a fountain pen having a double pen core structure that prevents a pen body and a pen core from falling off a shaft cylinder and prevents a writing defect due to deformation of an outer core.

The present invention
“1. The pen core is composed of an outer core and an inner core, and the inner core is inserted into a through hole formed in the outer core and extending in the axial direction. The pen body is disposed on the pen core so that the slit formed in the pen body and the ink groove of the outer core are continuously disposed, and the pen body and the pen core In a fountain pen with a double pen core structure in which the rear insertion portion of the outer core is press-fitted into the front opening of the shaft tube and fitted, both inner side walls forming the ink groove in the ink groove in the rear insertion portion of the outer core Forming a rib across the rib, and forming a shallow groove over the rib to connect the front and rear of the ink groove, and the rear insertion portion of the pen core is a front opening of the shaft cylinder The width of the ink groove of the outer core is held by the rib when the press fitting is performed on Fountain pen core structure.
2. 2. The fountain pen having a double pen core structure according to item 1, wherein the shallow groove has a depth dimension larger than a width dimension of the ink groove. Is.

  By providing the rib provided in the ink groove of the outer core at a position in contact with the through hole in the ink groove, the moldability at the time of injection molding and the mold structure can be simplified. Further, by forming the shallow groove above the rib, the ink overflowing from the ink groove can be sucked into the comb groove provided on the side surface of the pen core even at the position where the rib is provided. It is important to provide the rib in the present invention at a location where a force is applied in the direction of narrowing the ink groove in the cross-sectional direction of the outer core when the pen body and the pen core are press-fitted into the front opening of the shaft cylinder. When the protrusion is provided on the lower surface of the outer core, the rib is provided at the same position as the protrusion in the axial direction. In addition, by forming the depth dimension of the shallow groove provided above the rib larger than the width dimension of the ink groove, the capillary force in the shallow groove prevents the ink flow due to the capillary force of the ink groove before and after the shallow groove. No structure.

  According to the fountain pen having the double pen core structure of the present invention, it is possible to obtain a structure that prevents the pen body and the pen core from falling off from the shaft tube and does not cause a writing failure due to the deformation of the outer core.

FIG. 1 is a perspective view showing the main part of the fountain pen of the present invention. FIG. 2 is an exploded view of the fountain pen of FIG. FIG. 3 is a diagram illustrating a process of attaching the pen body and the pen core to the shaft cylinder in an overlapping manner. FIG. 4 is a longitudinal sectional view of FIG. FIG. 5 is an enlarged sectional view taken along line AA in FIG. 6 is an enlarged sectional view taken along line BB in FIG. 7 is an enlarged cross-sectional view taken along the line CC of FIG.

  Next, the present invention will be described with reference to the drawings, but the present invention is not limited to the following examples. In addition, the same members and the same parts in the drawings are denoted by the same reference numerals.

  FIG. 1 is a perspective view of the main part of the fountain pen of this embodiment, showing the relationship with a cartridge containing ink. FIG. 2 is an exploded view of the fountain pen shown in FIG. The fountain pen 1 shown in FIG. 1 has a pen body 2 overlaid on a pen core 3, a rear insertion part 2a extending rearward of the pen body 2, and a rear insertion part 3a extending rearward of the pen core 3. Are fitted into the front opening 4a of the front shaft tube 4 which is screwed with a rear shaft tube (not shown) to form a shaft tube. A protruding small-diameter portion 3b is formed at the rear end portion of the pen core 3, and the opening portion 5b of the cartridge 5 that stores ink (not shown) from the rear opening portion 4b of the front shaft cylinder 4 into the ink storage chamber 5a. It is supposed to be inserted in The ink in the cartridge 5 flows forward by the pen core 3, reaches the writing end 2d by the capillary force of the slit 2c formed in front of the round hole 2b of the pen body 2, and enables writing.

  As shown in FIG. 2, the pen core 3 of the present embodiment has a double pen core structure in which an outer core 31 and an inner core 32 are combined. A through hole 31a extending in the axial direction is formed at the center of the outer core 31, a plurality of comb grooves 31b are formed on the outer surface of the outer core 31, and an ink groove 31c is formed on the upper surface. Two protrusions 31d are provided below the intermediate portion, a rib 31f is formed across the inner wall 31e of the ink groove 31c above the protrusion 31d, and a shallow groove 31g is formed above the rib 31f. is there. The ink groove 31c of the outer core 31 is formed from the tip of the pen core 3 to the front end of the collar portion 31h formed in front of the small diameter portion 3b, and communicates with the upper portion of the through hole 31a. In a state where the core 32 is inserted into the through hole 31a of the outer core 31, it is connected to an ink flow path 32a formed above the inner core. The inner core 32 of the present embodiment has a semicircular cross-sectional shape, and is inserted into a circular through hole 31a formed in the outer core 31, and the lower surface 32b of the inner core 32 and the through hole An air passage 3c (see FIG. 4) through which air passes is formed between 31a and 31a.

  Next, the process of inserting the pen body 2 and the pen core 3 into the front barrel 4 will be described with reference to FIG. In this embodiment, the pen body 2 is overlapped on the pen core 3, and the rear insertion portion 2a and the rear insertion portion 3a are combined and inserted into the front opening 4a of the front shaft cylinder 4, but the pen core 3 Since the protrusion 31d is provided on the inner wall 4c, the position where the protrusion 31d is provided comes into contact with the inner wall 4c of the front shaft cylinder 4 most strongly and is assembled in the state shown in FIG. Further, the rear insertion portion 2a of the pen body 2 in this embodiment is a section L1 shown in FIG. 3, and the rear insertion portion 3a of the pen core 3 is a section L2 shown in FIG. Is provided in the rear insertion portion 3 a of the pen core 3 and is inserted into the front shaft tube 4.

  Next, the ink flow will be described with reference to FIG. 4 which is a longitudinal sectional view of FIG. 1 and FIGS. 5, 6 and 7 which are transverse sectional views thereof. Ink (not shown) accommodated in the cartridge 5 mounted on the small diameter portion 3b of the pen core 3 passes through the ink flow path 32a of the inner core 32, and passes through the ink groove 31c of the outer core 31 or the ink flow path 32a of the inner core 32. Through to the writing end 2. In this embodiment, as shown in FIG. 6, since the depth dimension H of the shallow groove 31g is formed larger than the width dimension W of the ink groove 31c, the ink passing through the ink groove 31c is the ink groove. Capillary force was able to flow smoothly without interruption from the rear ink groove 31i to the shallow groove 31g and from the shallow groove 31g to the front ink groove 31j before and after the rib 31f formed in 31c. In addition, when the rear insertion portion 2a of the pen body 2 and the rear insertion portion 3a of the pen core 3 are press-fitted into the front opening 4a of the front shaft cylinder 4, a protrusion 31d is provided in the cross section of the outer core 31. Although the force in the direction of narrowing the width of the ink groove 31c acts on the position, in this embodiment, the rib 31f is provided at the same position as the position of the protrusion 31d in the axial direction of the outer core 31, so The width never narrowed.

  The present invention is suitable for a fountain pen having a double pen core structure, and can also be used for a general pen core fountain pen that is not a double pen core.

1 ... fountain pen,
2 ... pen body, 2a ... rear insertion part, 2b ... round hole, 2c ... slicing, 2d ... writing end,
3 ... Pen core, 3a ... Back insertion part, 3b ... Small diameter part, 3c ... Air passage,
31 ... Outer core, 31a ... Through hole, 31b ... Comb groove, 31c ... Ink groove, 31d ... Projection,
31e ... inner wall, 31f ... rib, 31g ... shallow groove, 31h ... buttocks,
31i: Rear ink groove, 31j: Front ink groove,
32 ... Inner core, 32a ... Ink flow path,
4 ... front shaft cylinder, 4a ... front opening, 4b ... rear opening, 4c ... inner wall,
5 ... cartridge, 5a ... ink storage chamber, 5b ... opening.

Claims (2)

The pen core is composed of an outer core and an inner core, and the inner core is inserted into a through hole formed in the outer core and extending in the axial direction. The pen body is disposed on the pen core so that the slit formed in the pen body and the ink groove of the outer core are continuously disposed, and the pen body and the pen core are inserted backward. In a fountain pen having a double-pen core structure in which a fitting portion is press-fitted into a front opening portion of a shaft tube and fitted, an ink groove in a rear insertion portion of the outer core is horizontally disposed between both inner side walls forming the ink groove. In addition to forming a rib, a shallow groove is formed above the rib to connect the front and rear of the ink groove, and the rear insertion portion of the pen core is press-fitted into the front opening of the shaft tube. When the double pen is used, the width of the ink groove of the outer core is held by the rib. Fountain pen of the structure. The fountain pen having a double pen core structure according to claim 1, wherein the shallow groove has a depth dimension larger than a width dimension of the ink groove.

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