JPS6144869Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to improvements in the cap of a writing instrument. In particular, the writing part, which is the part to which the cap of the writing instrument is attached, is formed into a tapered shape to improve ease of writing and grip. Furthermore, the tail portion of the writing instrument is not tapered to accommodate a sufficient amount of ink and from a design perspective, but is formed to have the same diameter as the barrel.
The present invention relates to an improvement of the cap of such a writing instrument.

First, a conventional example of a seed cap will be explained based on FIGS. 1 to 3. The inner surface C near the rear end opening B of the cap A has protrusions D, D,
...is installed protrudingly. The retaining protrusions D, D,...
are for preventing the cap A from being accidentally pulled out when it is attached to the writing part (not shown) at the tip of the writing instrument, and are provided protrudingly at predetermined intervals in the circumferential direction. The inner diameter of cap A is the rear end opening B.
It is configured so that the diameter gradually decreases from the tip toward the tip. E is the tip receiving part of the writing part.

Next, the state of use of the cap A will be explained. When the writing instrument is not in use, the cap A is attached to the writing part, and is prevented from being accidentally pulled out by the retaining protrusions D, D, . . . . When using the writing instrument, remove cap A from the writing part.
The cylindrical tail part F of the writing instrument is inserted into the cap A. Then, the end portion of the tail portion F comes into pressure contact with the inner surface C of the cap A, thereby fixing it.

However, in the above-mentioned conventional configuration, the inner surface C of the cap A and the tail portion F are in pressure contact with each other in a circumferential state.
When the tail part F was inserted into the cap A, it became difficult for the air inside the cap A to escape, causing the cap A to float like an air damper or come off with the slightest movement. If you insert it firmly so that it does not come off, the retaining protrusions D, D, etc. will be crushed, and as a result, when the writing instrument is not in use, the cap A will not adhere to the writing part of the cap A, and it will be pulled out inadvertently. There was a drawback. On the other hand, when inserting the writing part of a writing instrument into the cap, since the writing part is tapered, the writing part may come into contact with the tip receiving part inside the cap, and it can be inserted smoothly into the tip receiving part. The problem was that the writing part could be damaged. Furthermore, even after the writing portion is inserted into the tip receiving portion, the writing portion is adhered to the tip receiving portion of the cap and the rear end opening of the cap, so that the writing portion cannot be held firmly.

Figure 4 shows another conventional example.
A tail plug H protrudes from the tail portion F of the tail plug H, and a circumferential groove I is provided in the tail plug H. On the other hand, the cap A that is attached to the writing part J has an inner surface C that prevents it from being pulled out from the writing part J, and at the same time it is locked in the circumferential groove I of the tail plug H. Projections K, K, . . . are provided to prevent the tail plug H from being pulled out. L is also a protrusion, and the protrusion L serves only to prevent the cap A from being pulled out from the writing portion J.

However, in the case of the above embodiment, the cap A can be attached to both the writing part J and the tail plug H to prevent it from being accidentally pulled out. Since the relative positional relationship between the groove I and the protrusions K, K, . . . and the protrusion dimensions of the protrusions K, K, .

The present invention has been developed in view of the above circumstances, and is provided on the inside surface of the cap at a position closer to the distal end than the above-mentioned retaining protrusion.
By providing pressing protrusions that come into pressure contact with the tail of a writing instrument when it is inserted at appropriate intervals in the circumferential direction, the problem of air dampers does not occur, and the structure is simple and the cap can be attached to the writing part. It can be firmly adhered to both the head and the tail, and when the writing part is adhered, the writing part, which is the pen tip, can be easily guided to be inserted, and it also prevents wobbling when it is adhered. The purpose is to provide a cap for writing instruments that can be used as a writing instrument.

Hereinafter, the present invention will be explained in detail based on the embodiments shown in the drawings. FIG. 5 is a cross-sectional view showing a cap according to the present invention, FIG. 6 is a cross-sectional view taken along the line Y--Y in FIG.
FIG. 7 is a sectional view for explaining the operation.

Reference numeral 1 denotes a cap that is attached to the writing part of the writing instrument, and protrusions 4, 4, .
In addition, pressure contact protrusions 7, 7, are provided on the inner surface 3 of the cap 1 at positions on the distal side of the retaining protrusions 4, 4, . . . at appropriate intervals.
7,... are provided protrudingly. Both protrusions 4, 4,
7, 7 are provided at appropriate intervals in the circumferential direction. Furthermore, a tip receiving portion 5 for a writing portion is provided at the tip of the inner surface 3 of the cap 1. The inner diameter of the cap 1 is configured to gradually become smaller from the rear end opening 2 toward the front end.
Reference numeral 6 denotes a tail portion of the writing instrument; pressure contact protrusions 7, 7, . It is fixedly locked with. On the other hand, when the writing part of the writing instrument is inserted into the cap 1, it is configured to be fixedly held by the tip receiving part 5, the pressure contact projections 7, . . . and the retaining projections 4, 4, .

In this embodiment, the pressure contact projections 7, 7,...
Long ribs are provided in the longitudinal direction of the cap 1 at regular intervals in the circumferential direction. The diameter of a circle passing through the protruding tips of each of the pressing protrusions 7, 7, . . . is set smaller than the diameter of a circle passing through the protruding tips of each retaining protrusion 4, 4, .

Next, the operation of the above embodiment will be explained. When the writing instrument is not in use, by inserting the tapered writing part into the rear end opening 2 of the cap 1, the writing part, which is the tip of the pen, is secured to the retaining protrusion 4,
4, . . . are guided by the pressure contact projections 7, 7, . . . and can be smoothly guided and attached to the tip receiving portion 5. In addition, when using the writing instrument, remove the cap 1 from the writing part and insert the cylindrical tail part 6.
into the cap 1. Then, the end portion of the tail portion 6 comes into pressure contact with the pressure contact projections 7, 7, . . . , and is thereby fixed. At this time, the air inside the cap 1 escapes to the outside through the gaps between the pressure contact projections 7, 7, .

FIG. 8 shows another embodiment of the present invention, in which the pressing protrusions 7, 7, .

As mentioned above, the present invention provides a cap for a writing instrument in which retaining protrusions 4, 4, . . . pressure contact protrusions 7, 7, which press against the tail portion 6 of the writing instrument when the tail portion 6 of the writing instrument is inserted at a position on the distal side of the retaining protrusion on the inner surface 3 of the cap;
... are the caps of a writing instrument provided at appropriate intervals in the circumferential direction.

Therefore, when the tail part 6 is inserted into the cap 1 when the writing instrument is not in use, the pressing projections 7, 7, . . . come into pressure contact with the tail part 6, so that the writing instrument is firmly fixed. Even if the tail part 6 is strongly inserted, the retaining protrusions 4, 4, . Furthermore, since there is a gap between each of the pressure contact projections 7, 7, . . . , no air damper phenomenon occurs when the tail portion 6 is inserted into the cap 1. That is, according to the present invention, the structure is simple, and when the writing instrument is in use, the cap can be securely fixed and held in two places, the pressure contact protrusion and the retaining protrusion, and when the writing instrument is not in use, the cap can be securely fixed and held in place. The writing protrusion and press-contact protrusion make it easy to smoothly insert the writing part without damaging the pen tip, and after attachment, the 3 locations of the retaining protrusion, press-contact protrusion, and tip holder make it easy to insert the writing part smoothly. Fixed holding is possible.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a conventional cap;
The figures are a sectional view taken along the line X-X of Fig. 1, Fig. 3 is a sectional view for explaining the operation, Fig. 4 is a sectional view showing another conventional example, and Fig. 5 is a sectional view showing the cap according to the present invention. In the figures, FIG. 6 is a sectional view taken along the line Y-Y in FIG. 5, FIG. 7 is a sectional view for explaining the operation, and FIG. It is a sectional view along the Z-Z line. 1... Cap, 2... Rear end opening, 3... Inner surface, 4, 4,... Removal prevention protrusion, 6... Tail part,
7, 7, ... pressure welding protrusion.

Claims (1)

[Scope of utility model registration request] A retaining protrusion is provided on the inner surface near the rear end opening of the cap that is attached to the writing part, and a protrusion is provided at an appropriate distance from the retaining protrusion on the inner surface of the cap at a position on the distal side of the retaining protrusion. The protrusions are provided at appropriate intervals in the circumferential direction, and a tip receiving part is provided at the tip so that when the tail of the writing instrument is inserted, it comes into pressure contact with the tail. A writing instrument characterized in that the writing tool is fixedly locked by a pressure contact projection and a removal prevention projection, and when the writing part of the writing instrument is inserted, it is fixedly held by a tip receiving part, the pressure contact projection and the removal prevention projection. cap.