JPH0512182U - Writing instrument - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a writing instrument which has a small number of types of parts to be prepared, has a simple structure for holding a refill, and which can be surely held. [Structure] Same-shaped front end 2 and tail plug 3 with inner steps 21 and 31
Are attached to both ends of the shaft cylinder 1, and the inner steps 21 and 31 of the front opening 2 and the tail plug 3 are the tip 42 of the ballpoint pen refill 4, the step 43 of the ink containing tube 41, and the rear end of the ink containing tube 41.
The ball-point pen refill 4 is fixed by abutting on each of them.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a writing instrument in which a refill is housed in a barrel having a front opening and a tail plug attached to both ends.

[0002]

[Prior art and its problems]

 Among writing instruments, for example, in a ballpoint pen, a tip and tail plugs are attached to both ends of a barrel, a ballpoint pen refill is stored in the barrel, and the tip of the ballpoint refill projects from the tip to enable writing. There are many things. In order to fix the ball pen refill, a tail plug is provided with a fitting hole to press and hold the rear end of the ink container tube of the ball pen refill into this fitting hole, or the ball pen refill is pushed backward by a spring. The ink is ejected and the rear end face of the ink containing pipe is received by a tail plug or the like. Therefore, there is a problem that the number of parts is large and the holding structure of the ballpoint pen refill is relatively complicated.

[0003]

[The purpose of the device]

 SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a writing instrument in which the number of types of parts to be prepared is small and the structure for holding a refill accommodated in a barrel is simple and can be surely held.

[0004]

[Constitution of the device and its action]

 The writing instrument of the present invention is constructed such that a front opening and a tail plug of the same shape having an inner step are attached to both ends of the barrel, and the inner steps of the front opening and the tail plug are the step portion of the refill tip and the ink containing tube. It is characterized in that the refills are fixed by contacting the rear ends of the ink containing tubes.

That is, since the front end and the tail plug that are attached to both ends of the shaft cylinder have the same shape, the common parts are aimed at, so that the kinds of parts to be prepared are reduced and the molding is performed. The same mold can be used, which reduces the cost. Further, since the tip and the tail end of the ink come into contact with the stepped portion of the ink container and the rear end of the ink container, the referee is clamped, so that the holding structure is simple and can be securely held. You can

[0006]

【Example】

 The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 shows an example in which the present invention is applied to a ball pen. In FIG. 1, the shaft cylinder 1 is a cylinder body formed of synthetic resin in a front-back symmetry, and external threads are formed on the inner surfaces of the openings at both ends. ing. A front opening 2 and a tail plug 3 which are also made of a synthetic resin are screwed into the openings at both ends of the barrel 1, and the front opening 2 and the tail plug 3 have the same shape. That is, the front port 2 and the tail plug 3 are the same part. The ball-point pen refill 4 housed in the barrel 1 has an ink storage tube 41 containing an ink occlusion body with a tip 42 holding a ball rotatably attached to the tip thereof. There is a step 43 between the tip and the tip 42. An inner step 21 and an inner step 31 are formed inside the front opening 2 and the tail plug 3. The inner step 21 of the front opening 2 contacts the step 43, and the step 31 of the tail plug 3 is formed. The front port 2 and the tail plug 3 are screwed to the shaft cylinder 1 so as to come into contact with the rear end portion 44 of the ink containing tube 41. Therefore, the ballpoint pen refill 4 is clamped and held by the tip 2 and the tail plug 3 with the tip 42 protruding from the tip 2. Instead of screwing, the front end 2 and the tail plug 3 may be pressed into both end openings of the barrel 1.

In this way, since the front opening 2 and the tail plug 3 are made common, the types of parts to be prepared are reduced accordingly. Therefore, the mold for molding the front opening 2 and the tail plug 3 may be common and the cost can be reduced, and since the front opening 2 and the tail plug 3 need not be identified at the time of assembly, they can be easily assembled. . Further, since the front opening 2 and the tail plug 3 have the same shape, the shapes of the front part and the rear part of the writing instrument are symmetrical, which is also advantageous in that the writing instrument is rich in design. Since the ball-point pen refill 4 is held between the front opening 2 and the tail plug 3, it is not necessary to form an insertion hole in the tail plug 3 or to spring the ball-point pen refill 4 with a spring, and the holding structure is It can be held easily and securely. It is obvious that a refill such as a marker having a rod-shaped pen body may be used instead of the ballpoint pen reference 4.

[0008]

[Effect of the device]

 As described above, in the writing instrument of the present invention, the tip of the same shape attached to both ends of the barrel and the inner step of the tail plug are the tip of the refill, the step of the ink containing tube, and the ink containing tube. Since the refills are pressed against each other to hold the refills under pressure, the number of types of parts to be prepared is small, the structure for holding the refills is simple, and a writing instrument that can securely hold the refills can be obtained. it can.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of an embodiment of the present invention.

[Explanation of symbols]

1 Shaft Cylinder 2 Front Port 21 Inner Stage 3 Tail Plug 31 Inner Stage 4 Ballpoint Pen Refill 41 Ink Storage Tube 42 Tip 43 Step 43 44 Rear End of Ink Storage Tube

Claims (1)

[Scope of utility model registration request] 1. A front opening and a tail plug of the same shape having an inner step are attached to both ends of a barrel, and the inner steps of the front opening and the tail plug are a tip portion of a refill, a step portion of an ink containing tube, and an ink containing tube. A writing instrument characterized in that the refill is fixed by abutting on the respective rear end portions.