JPH0213194Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Purpose of the invention The invention relates to a cap for writing instruments. Specifically, it is a writing instrument cap in which an inner cap is engaged with the main body of the cap, and by specifying the structure and combination of both of the above-mentioned members, the writing instrument satisfies the assembly workability, the fitting strength of the inner cap, etc. It provides a storage cap for use.

Conventionally, in this type of cap, the inner cap has mainly been fixed simply by press-fitting or by intervening another member, which has not always been satisfactory in terms of the inner cap falling off and workability.

Particularly in caps for large-diameter writing instruments, where the main body of the cap is made of soft plastic, a simple and effective countermeasure has been desired to avoid a reduction in fixing strength due to deformation due to stress.

The cap of the present invention solves the above-mentioned conventional problems.

(b) Structure of the invention The structure of the cap 1 of the invention is shown in drawings (Figures 1 and 3).
4) will be explained.

The main body 2 of the cap has at least two legs 2-1 vertically disposed on the top surface of the cap, excluding the central part thereof, parallel to the side wall, and a small protrusion 2-1 is provided on the inner surface of each leg 2-1. The inner cap 3 has a base 3-1 and at least two axial ribs 3-2 corresponding to the leg pieces 2-1 on the outer wall of the base 3-1. It is integrally formed with the cylindrical part 3-3 leaving an axial recessed gap 3-4 in which the piece 2-1 is inserted, and a protrusion 3-5 is formed on the outer peripheral surface of the cylindrical part 3-3. Both members can be obtained by injection molding of plastic. The protrusions 3-5 in the above need only have locking strength, and are not limited to the annular shape shown in the illustration, but may be arranged at appropriate intervals. Further, although the drawing shows an example of a combination of two leg pieces 2-1 and two corresponding ribs 3-2, the number of leg pieces 2-1 is in the range of 2 or more and about 8 or less. Moreover, it is sufficient that at least two ribs 3-2 are provided corresponding to the leg pieces 2-1, and the number of ribs 3-2 is not necessarily the same as the number of leg pieces 2-1. Note that a clip (not shown) can be integrally provided on the outer surface of the cap main body 2 as required.

Inside the cap main body 2, the inner cap 3 connects the protrusion 3-5 of the cylindrical portion 3-3 with the small protrusion 2 of the leg piece 2-1.
The cap of the present invention is constructed by assembling the rib 3-2 so as to sandwich the leg piece 2-1 inserted into the recessed gap 3-4.

(c) Function and effect of the invention In the assembled state, the small protrusion 2 of the leg piece 2-1
The protrusion 3-5 that has climbed over -2 is engaged with the inner surface of the small protrusion 2-2, and the bottom portion 3-6 is in contact with the inner top surface of the cap main body 2, and is connected to the tip 4 of the writing instrument. When the cap 1 is attached or detached, movement in the axial direction is inhibited.

Here, the rib 3-2 clamps the leg piece 2-1 inserted into the recessed gap 3-4, and prevents the leg piece 2-1 from expanding in the radial direction and breaking due to the expansion, and locks the leg piece 2-1. Functions to maintain stable strength.

As mentioned above, the cap main body 2 is hard,
Even if any soft plastic material is used, the engagement strength can be stably maintained to satisfy practicality, and the flexibility of the plastic material to be applied can be increased. In addition, with the above configuration, both members have no constituent elements that interfere with injection molding processing, and satisfy molding processability.

In addition, in terms of ease of assembly, the inner cap 3 can be reliably engaged simply by pushing it into a predetermined position within the cap main body 2, and can be assembled with a low pressing force, improving both productivity and functionality. To provide a writing instrument cap that satisfies the following.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional view of the cap of the present invention, Figure 2 is a perspective view of the main part of the tip of the writing shaft, Figure 3 is a perspective view with a portion of the main body of the cap cut away, and Figure 4 is a perspective view of the inner cap. It is. 1... Writing instrument cap, 3-2... Rib, 2
... Cap main body, 3-3 ... Bottomed cylinder part, 2-1
... Leg piece, 3-4 ... Recessed gap, 2-2 ... Small protrusion, 3-5 ... Protrusion, 3 ... Inner cap, 3-6
...Bottom part, 3-1...Base part, 4...Shaft tip part.

Claims (1)

[Scope of utility model registration request] A writing instrument cap 1 has an inner cap 3 fitted into a cap main body 2, and the cap main body 2 has at least two leg pieces 2-1 extending parallel to the side wall at a location other than the center of the inner top surface of the cap main body 2. A small protrusion 2-2 is provided on the inner surface of each leg piece 2-1, and the inner cap 3 has a base 3-1 and a bottomed cylindrical part 3- extending from the base 3-1. 3, the base 3-1
At least two axial ribs 3-2 corresponding to the leg pieces 2-1 are formed on the outer wall of the cylindrical part 3-3 to form an axial recessed gap 3-4 into which the leg pieces 2-1 are inserted.
The cylindrical portion 3 is integrally formed with the cylindrical portion 3 remaining between the
A protrusion 3-5 is provided on the outer peripheral surface of the inner cap 3, and the inner cap 3 is inserted into the cylindrical portion 3-5 within the cap main body 2.
The protrusion 3-5 of No. 3 is inserted and locked over the small protrusion 2-2 of the leg piece 2-1, and the rib 3-2 holds the inserted leg piece 2-1 in the recessed gap 3-4. Writing instrument cap 1 assembled as follows.