JPH0638710Y2 - Synthetic resin writing instrument shaft with non-slip layer - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a writing instrument shaft made of a synthetic resin with a rubber-like non-slip coating on the outer periphery, and the material and the man-hours are reduced, and the relaxation and watertightness are reduced. The present invention relates to a writing instrument shaft made of this kind of synthetic resin, which is inexpensive and excellent without being bothered by.

[Conventional technology]

This type of conventional writing instrument shaft is configured by fitting a synthetic resin shaft tip and tail plug, which are separately formed, at the front end and rear end of a synthetic resin main shaft, respectively. However, fitting the shaft tips and tail plugs of separate members to the main shaft in this way not only requires the number of manufacturing steps, but also makes each fitting part incompatible due to errors, which leads to loss products. In particular, in the case of the spindle and the tip of the spindle, lack of tightness may cause ink leakage or delusion of the tip of the spindle, which may interfere with writing.Therefore, extra care must be taken when fitting the spindle and the tip of the spindle. There was a disadvantage to

[Problems to be solved by the device]

In order to eliminate the disadvantages of the prior art, the present invention, in particular due to the structure of a synthetic resin writing instrument shaft with a non-slip layer, has a shaft tip of a separate member fitted to the main shaft, which has been conventionally performed. By reducing the number of steps and integrating them, the disadvantages of delusion of the shaft tip and ink leakage are eliminated, and the number of parts is reduced to make it suitable for inexpensive mass production.

[Means for Solving the Problems]

That is, the present invention relates to a main shaft made of hard synthetic resin, a non-slip layer made of soft synthetic resin integrally laminated on the outer periphery of the main shaft, and a main shaft in which the end of the main shaft is conically squeezed. A synthetic resin writing instrument shaft consisting of an integrally formed hard synthetic resin shaft tip, wherein the shaft tip formed at the end of the main shaft is layered with a soft synthetic resin non-slip layer. A gist of a synthetic resin writing instrument shaft with a non-slip layer is characterized in that the mechanically peeled part of the soft synthetic resin corresponding to the tip of the main shaft is squeezed.

[Action effect]

Since the shaft tip of the synthetic resin writing instrument shaft with the non-slip layer of the present invention is integrally formed with the main shaft as described above, it is possible to manufacture a shaft tip of a separate member as in the conventional case, or to use a single shaft for the main shaft. There is no need to put it in. In addition, there is a real advantage that it can be mass-produced at low cost without fear of producing a lost product due to delusion of shaft tip or ink leakage.

Further, the writing instrument shaft made of synthetic resin with a non-slip layer of the present invention has the following effects.

As a writing instrument shaft having a conventional drawn shaft tip, a metal mold provided with a conical concave portion and capable of heating is used, and a main shaft made of hard synthetic resin is heated to a temperature at which it can be thermally deformed. In other words, there is a writing instrument shaft which is made only of a hard synthetic resin and which has a tip of a spindle formed by pressing the tip of the spindle into the recess of the mold and inserting the tip of the spindle into a conical shape.
On the other hand, in the case of a synthetic resin writing instrument shaft in which the non-slip layer made of soft resin is provided on the outer periphery of the main shaft made of hard synthetic resin, due to the difference in the molten state between the soft resin and the hard resin, the shaft It is not possible to obtain the same writing implement shaft made of only a hard synthetic resin because swelling may occur due to the melted soft resin near the boundary between the tip and the main shaft or wrinkles of the soft resin may occur at the shaft tip. The non-slip synthetic resin writing instrument shaft of the present invention has a mechanically peeled portion of the soft resin mechanically peeled from the shaft tip portion of the main shaft on which the soft resin anti-slip layer is layered. Since it is a shaft tip, the portion to be inserted into the mold at the time of squeezing processing is only a hard resin, and a shaft tip without swelling and wrinkles due to the soft resin can be obtained. As a result, the boundary portion between the main shaft and the shaft tip is formed smoothly and accurately, so that the sealing performance when the cap is attached is good.

Also, when looking at the entire tip of the synthetic resin writing instrument shaft of the present invention, the soft synthetic resin is mechanically peeled off, and since there is no rise or wrinkle due to the soft resin, the appearance of the entire tip is good, A synthetic resin writing instrument shaft with a non-slip layer that is excellent in design can be obtained.

〔Example〕

A hard vinyl chloride main shaft 1 and a soft vinyl chloride covering layer 2 are successively and integrally layered on the outer periphery of the main shaft 1 by an extrusion molding machine, and then this is sequentially cut into a required length, and the tip end portion corresponding to the tip of the shaft is formed. After peeling off, the exposed end portion of the main shaft is formed on the conical shaft tip 3 by a squeezing machine, and a tail plug 4 made separately is fitted to the other end opening of the shaft.

[Brief description of drawings]

FIG. 1 is an external perspective view of a synthetic resin writing instrument shaft of the present invention, and FIG. 2 is a vertical side view of FIG. 1 ... Spindle made of hard synthetic resin 2 ... Layer of soft synthetic resin 3 ... Shaft tip made of squeezed hard synthetic resin

Claims (1)

[Scope of utility model registration request] 1. A main shaft made of hard synthetic resin, a non-slip layer made of soft synthetic resin integrally layered on the outer periphery of the main shaft, and a main shaft in which the end of the main shaft is squeezed into a conical shape. A synthetic resin writing instrument shaft consisting of an integrally formed hard synthetic resin shaft tip, wherein the shaft tip formed at the end of the main shaft is layered with a soft synthetic resin non-slip layer. A writing instrument shaft made of synthetic resin with a non-slip layer, characterized in that the mechanically peeled part of the soft synthetic resin corresponding to the tip of the main shaft is squeezed.