JPH0647798Y2 - Cap mechanism - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a cap mechanism having a high sealing property that does not require packing.

[Conventional technology]

Conventionally, in a cap mechanism including a large wide-mouth bottle mouth tube, an inner plug body, and a cap body, since the mouth tube is easily deformed, the close assembly of these three members is not sufficient. It lacked in sealing performance and had a packing to improve its sealing performance.

[Problems to be solved by the invention]

In a conventional cap mechanism provided with a packing, the packing must be separately molded and assembled, and the packing is made of relatively expensive rubber or synthetic rubber, which simplifies the manufacturing process and reduces the manufacturing cost. Was desired.

The present invention has been conceived in view of the above points, and an object of the present invention is to provide a cap mechanism that has a high sealing property, simplifies the manufacturing process, and reduces the manufacturing cost.

[Means for solving problems]

Therefore, the cap mechanism of the present invention comprises the bottle mouth tube 1, the inner plug body 2, and the cap body 3.

The bottle mouth tube 1 has a thread on the outer surface and a step 4 on the upper end of the inner surface.
Have. The inner plug 2 has a collar piece 6 that engages with the step portion 4 of the mouth cylinder 1 protruding from the upper end of the cylinder wall 5 fitted in the mouth cylinder 1, and an inner wall 7 from the inner surface of the cylinder wall 5. It was erected to form a spout. The cap body 3 has a top-end cylindrical shape in which a thread to be screwed into the mouth tube 1 is formed on the inner surface of the peripheral wall 8.

Then, in a state where the cap body 3 is screwed and assembled to the lower surface of the peripheral end portion of the top wall 9 of the cap body 3, the outer surface strongly abuts the open end of the mouth cylinder 1 and the lower end is the inner plug. Body 2 collar piece 6
A seal piece (10) that closely contacts the upper end is provided.

[Action]

When the cap body 3 is attached to the mouth tube 1 and reaches the vicinity of the screwing limit, the outer surface of the sealing piece 10 first pushes the opening end of the mouth tube 1 so as to widen and strongly and closely contacts the opening end of the mouth tube. This keeps the mouthpiece 1 in a perfect circle and prevents liquid leakage that may occur due to deformation into an ellipse. This effect is particularly effective for a bottle whose mouth tube is easily deformed, such as a large wide-mouth bottle.

When the above-mentioned state is screwed to the screwing limit, the lower end of the seal piece 10 presses the upper end surface of the inner plug body 2 cylindrical wall 5 and comes into close contact with it. Then, by the force of pressing the inner plug body 2 downward, the cylindrical wall 5
The collar piece 6 of the above closely contacts the step portion 4.

The liquid content in the bottle is prevented from leaking by the close contact between the collar piece 6 and the step portion 4. Even if it leaks from the contact portion, it does not leak to the outside due to the strong and close contact between the outer surface of the seal piece 10 and the opening end of the mouth tube 1.

After pouring out the content liquid, the upper surface of the inner plug body 2 (on the inner wall 7 or the cylinder wall 5)
The residual liquid remaining may leak to the outside when the bottle falls down, but according to the present invention, the residual liquid is reliably sealed by the close contact between the seal piece 10 and the flange piece 6. Further, this residual liquid is also sealed by strong and close contact between the outer surface of the seal piece 10 and the open end of the mouth cylinder 1.

[Example] An example will be described with reference to the drawings.

Since the outer surface of the sealing piece 10 is in contact with the opening end of the mouth tube 1 to make the mouth tube 1 a perfect circle, the sealing piece 10 has a substantially inverted conical cross section.
The cap body 3 is provided around the lower end of the top wall 9 with a perfect circle, and the material thereof is harder than the material of the mouth tube 1.

Further, the inner plug body 2 is made of a soft synthetic resin, and thereby plays a role of a packing that further secures the sealing property by the close contact with the step portion 4 of the flange piece 6 and the seal piece 10.

A ridge 11 is provided adjacent to the sealing piece 10 on the lower surface of the top wall 9, and the ridge 11 is in close contact with the upper end surface of the mouth cylinder 1 so that the content liquid in the bottle and The leakage of the residual liquid on the inner plug 2 is reliably prevented.

Further, a closing wall 12 is provided on the lower surface of the top wall 9 of the cap body 3 so that the outer surface of the closing wall 12 contacts the upper end of the inner surface of the inner wall 7 to close the opening.

[Effect of device]

As described above, according to the present invention, since the outer surface of the seal piece 10 presses the opening end and strongly and closely contacts it to keep the mouthpiece 1 in a perfect circle, the mouthpiece 1 is deformed into an ellipse. The resulting leak is prevented, and the strong and close contact prevents the content liquid in the bottle body and the liquid remaining on the inner plug body 2 from leaking to the outside to improve the sealing property. Also, leakage of the contents in the bottle body is prevented mainly by the close contact between the lower end of the collar piece 6 and the one-step portion 4 of the mouth cylinder, and the leakage of the residual liquid on the inner plug body 2 is mainly caused by the lower end 4 of the seal piece 10. This is prevented by a close contact with the collar piece 6.

This makes it possible to obtain high sealing performance without the need for expensive packing that was required in the past.
Accordingly, the manufacturing process can be simplified and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment, and FIG. 2 is an enlarged sectional view of an essential part thereof. Explanation of code 1: mouthpiece, 2: inside plug body, 3: cap body, 4: step, 5: cylinder wall, 6: collar piece, 7: inner wall, 8: peripheral wall, 9: top wall, 10: seal Piece, 11: ridge, 12: closed wall.

Claims (1)

[Scope of utility model registration request] 1. A bottle mouth tube (1) having a thread on the outer surface and a step (4) at the upper end of the inner surface, and a tube wall (5) fitted in the mouth tube (1). From the top
A stopper plug (6) that engages with the stepped portion (4) of the mouth tube (1), and an inner wall (7) is erected from the inner surface of the tube wall (5) to form a spout. The cap (3) comprises a body (2) and a cap body (3) having a cylindrical shape with a thread formed on the inner surface of the peripheral wall (8) to be screwed into the mouth tube (1). In the state in which the cap body (3) is screwed onto the lower surface of the peripheral end portion of 9), the outer surface strongly abuts the open end of the mouth tube (1), and the lower end Is a cap mechanism provided with a seal piece (10) that comes into close contact with the upper end of the flange piece (6) of the inner plug body (2).