JPH0731385U - Writing instrument cap - Google Patents

Abstract

(57) [Abstract] [Purpose] We want to increase the tightening force of the inner cap part that is fitted to the tip of the writing instrument to ensure the prevention of drying and evaporation of ink from the pen tip and the air communication hole. [Structure] An outer cap 1 in which an inclined shoulder portion 11 is formed in a recessed portion 10 following a plurality of projecting locking portions 9, and an inner spring 12 elastically presses toward the open end of the outer cap 1 and It has an inner cap 2 having an elastic packing ring 15 mounted on the outer peripheral surface of a slanted opening end 13 that is movable in the recessed portion 10, and when the outer cap 1 is fitted and locked on the writing instrument 3, The inner cap 2 moves inwardly against the inner spring 12, and the elastic packing ring 15 of the inner cap 2 is pressed against the inclined shoulder 11 of the outer cap 1 to tighten the oblique opening end 13 of the inner cap 2. To do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a double cap structure for a writing instrument having an inner cap that is elastically pressed by an inner spring inside the outer cap.

[0002]

[Prior art]

 In an ink storage type writing instrument with a flow rate control mechanism such as a bellows structure, an air communication hole is formed in the writing instrument barrel so that the ink storage section is at atmospheric pressure. It is necessary to surely prevent the ink from drying or evaporating from the tip or the air communication hole, and to suppress the pressure fluctuation from the pen tip or the air communication hole to the ink reservoir as much as possible. Therefore, as shown in FIG. 4, the inner cap 2 is provided on the inner side of the outer cap 1 to be fitted on the writing instrument 3, and the inner cap 2 is fitted to the writing tip portion 4 of the writing instrument 3. A structure in which the pen tip 5 and the air communication hole 6 formed in the writing instrument 3 are located in the sealed space 8 is conventionally known. In the figure, 7 is a bellows structure.

[0003]

[Problems to be solved by the device]

 However, in the structure described above, as the cap is repeatedly attached and detached, the inner cap portion that fits into the tip of the writing instrument gradually expands and deforms, and a reliable sealed space cannot be formed. There was a tendency that the ink drying / transpiration prevention function from the air communication holes declined. The present invention has been made for the purpose of eliminating this drawback.

[0004]

[Means for Solving the Problems]

 According to the present invention, an inner cap is provided inside an outer cap that fits and locks a writing instrument, and the nib of the writing instrument is placed in a sealed space formed when the inner cap is fitted to the writing tip of the writing instrument. Also, in a writing instrument cap having an air communication hole formed in the writing instrument, an inclined shoulder portion is formed on the inner surface side of the outer cap in the concave portion following the plurality of projecting locking portions, and the outer cap is formed. An internal spring is installed inside the to elastically press the inner cap toward the open end of the outer cap, and the slanted open end of the inner cap that fits into the writing tip of the writing instrument is movable in the recess of the outer cap. None, when an elastic packing ring is attached to the outer peripheral surface of the oblique opening end, and when the outer cap is fitted and locked on the writing instrument, the elastic packing ring is pressed against the inclined shoulder of the outer cap. Inside cap It is obtained so as to tightening the oblique open end.

The outer cap can be composed of an outer cap outer cylinder part and an outer cap inner cylinder part which is concentrically arranged inside the outer cap outer cylinder part at appropriate intervals. In that case, the outer cap inner cylinder part Further, the plurality of projecting locking portions, the recessed portion, and the inclined shoulder portion are formed.

[0006]

[Work]

 When pushing the inner cap inward with the writing instrument inserted into the outer cap, even if the displacement length is long, the writing tip of the writing instrument is fitted into the oblique opening end of the inner cap and resists the internal spring. Since it pushes forward, the pressure inside the sealed space of the inner cap is not increased. When the elastic packing ring of the inner cap is pressed against the inclined shoulder portion of the inner tube portion of the outer cap, the oblique opening end portion of the inner cap is subjected to the pressure through the elastic packing ring. As a result, the close contact between the oblique opening end of the inner cap and the writing tip of the writing instrument is ensured. The internal spring prevents abrupt separation when the cap is separated from the writing instrument, so the pressure inside the sealed space of the inner cap does not become negative.

When the outer cap is composed of the outer cap outer cylinder portion and the outer cap inner cylinder portion which is concentrically arranged inside the outer cap outer cylinder portion, the writing instrument snaps when the cap is fitted and locked. Since it makes a sound, it can be used as a signal not to force it further.

[0008]

【Example】

 In the embodiment shown in FIG. 1, the outer cap 1 includes an outer cap inner cylinder portion 1a and an outer cap inner cylinder portion 1b which are concentrically arranged inside the outer cap outer cylinder portion 1a at appropriate intervals. Four protruding engaging portions 9 (see FIG. 2) are formed at the open end of the outer cap inner cylinder portion 1b which is approximately half the length, and these protruding engaging portions 9 are formed. A continuous annular recess 10 and an inclined shoulder 11 are formed at the end of the recess 10. The outer cap inner cylinder portion 1b is concentrically arranged inside the outer cap outer cylinder portion 1a at appropriate intervals so that a pleasant clicking sound is generated each time the outer cap 1 is fitted on the writing instrument 3. However, if it is not necessary, a single outer cap configuration may be used.

The inner cap 2 provided in the outer cap 1 is elastically pressed toward the open end of the outer cap 1 by the internal spring 12. An annular groove 14 is formed on the outer peripheral surface of the oblique opening end 13 of the inner cap 2 to be fitted into the writing tip 4 of the writing instrument 3, and an elastic packing ring 15 is attached to the annular groove 14. It is shown in FIG. 1 that the air communication hole 6 is closed by fitting the slanted opening end 13 into the writing tip 4 of the writing instrument 3, as shown in FIG. The slanted opening end 13 of the inner cap 2 which is elastically pressed by the inner spring 12 is engaged and locked with the projecting locking portion 9 of the outer cap 1b so that the inner cap 2 does not come out (see FIG. 1). And FIG. 2). The diameter of the slanted opening end 13 of the inner cap 2 and the elastic packing ring 15 is slightly smaller than the inner diameter of the annular recess 10 so that the elastic packing ring 15 can smoothly move in the annular recess 10 of the outer cap 1b (Fig. 1 and Figure 2). The elastic packing ring 15 mounted on the inner cap 2 and the inclined shoulder portion 11 of the outer cap inner cylinder portion 1b face each other in the axial direction (see FIGS. 1 and 3).

First, the writing instrument 3 is inserted into the outer cap 1 in the state shown in FIG. 3, the writing tip 4 of the writing instrument 3 is fitted into the oblique opening end 13 of the inner cap 2, and then the internal spring 12 is also inserted. When the writing implement 3 is pushed against this, the annular ridge 16 of the writing implement 3 bumps into the four protruding locking portions 9 of the outer cap inner cylinder portion 1b. After that, by further pushing in, the projecting locking portion 9 is pressed and deformed outward and passes through the portion. Immediately after passing, the protruding locking portion 9 that has been pushed open suddenly returns to its original state, and at that time, the annular ridge 16 is struck and a clicking sound is heard. With this, the user can be sure that the annular raised portion 16 of the writing instrument 3 is engaged and locked with the protruding locking portion 9 of the outer cap inner cylinder portion 1b (see FIG. 1).

Around the same time, the elastic packing ring 15 of the inner cap 2 is pressed against the inclined shoulder portion 11 of the outer cap inner cylindrical portion 1b to be compressed and deformed, and the pressing force is applied by the writing tip 4 of the writing instrument 3. Since it acts so as to apply a tension from the outside of the slanting opening end 13 of the inner cap 2 to be fitted, the slanting opening end 13 of the inner cap 2 is brought into close contact with the writing tip 4 of the writing instrument 3. .

[0012]

[Effect of device]

 As described above, according to the configuration of the present invention, even if the oblique opening end of the inner cap, which is gradually fitted to the tip of the writing instrument, expands and deforms while the outer cap is repeatedly attached and detached, When the cap is fitted, the elastic packing ring of the inner cap is pressed against the slanted shoulder of the inner tube of the outer cap, and the pressing force causes the oblique opening end of the inner cap to come into close contact with the writing tip of the writing instrument. The airtightness of the sealed space inside the inner cap is ensured, and as a result, the prevention of ink drying and evaporation from the pen tip and the air communication hole can always be achieved reliably. In addition, by providing the internal spring, when the outer cap is fitted on the writing instrument or when the fitted outer cap is removed from the writing instrument, the fluctuation of the atmospheric pressure in the sealed space inside the inner cap is reduced, so that the air can be drawn. Do not push it in or suck out the ink to cause dripping.

The outer cap outer cylinder portion and the outer cap inner cylinder portion that is concentrically disposed inside the outer cap outer cylinder portion constitute an outer cap, and the cap is fitted and locked on the writing instrument each time. If you make a clicking sound, it will not be pushed in further for the signal, so it is possible to prevent expansion deformation of the oblique opening end of the inner cap.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a fitted state of a writing instrument cap according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG. 1 and viewed in the direction of the arrow.

FIG. 3 is a cross-sectional view showing a state before fitting.

FIG. 4 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 1 is an outer cap 1a is an outer cap Outer cylinder part 1b is an outer cap Inner cylinder part 2 is an inner cap 3 is a writing instrument 4 is a writing tip 5 is a pen tip 6 is an air communication hole 7 is a bellows structure 8 is a sealed space 9 is a protrusion Locking portion 10 is a concave portion 11 is an inclined shoulder portion 12 is an internal spring 13 is an oblique opening end portion 14 is an annular concave groove 15 is an elastic packing ring 16 is an annular ridged portion

Claims (2)

[Scope of utility model registration request] 1. A sealed space formed when an inner cap 2 is provided inside an outer cap 1 which is fitted and locked on a writing instrument 3, and the inner cap 2 is fitted on a writing tip portion 4 of the writing instrument 3. In the writing instrument cap in which the pen tip 5 of the writing instrument 3 and the air communication hole 6 formed in the writing instrument 3 are provided in the inside of the writing instrument 8, a plurality of projecting locking portions 9 are provided on the inner surface side of the outer cap 1. An inclined shoulder portion 11 is formed in the subsequent recessed portion 10, and an inner spring 12 is provided inside the outer cap 1 to form the inner cap 2
Is pressed toward the open end of the outer cap 1, and the slanted open end 13 of the inner cap 2 fitted into the writing tip 4 of the writing instrument 3 is movable in the recess 10 of the outer cap 1. The elastic packing ring 1 is provided on the outer peripheral surface of the end portion 13 facing the opening.
5, when the outer cap 1 is fitted and locked on the writing instrument 3, the elastic packing ring 15 is pressed against the inclined shoulder portion 11 of the outer cap 1 so that the slanted opening end portion of the inner cap 2 is closed. A writing instrument cap characterized by tightening 13. 2. The outer cap 1 is composed of an outer cap outer cylinder part 1a and an outer cap inner cylinder part 1b which is concentrically arranged inside the outer cap outer cylinder part 1a at appropriate intervals. In addition, the plurality of protruding locking portions 9 and the recessed portion 1
The writing instrument cap according to claim 1, wherein 0 and an inclined shoulder portion 11 are formed.