JPH0644827Y2 - cap - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a cap, and more specifically, it is permanently attached to the opening of various containers without being scheduled to be removed once it is attached. Regarding the cap. This type of cap is sometimes called a "blind lid" because of its function.

[Conventional technology]

Conventionally, this type of cap is press-fitted or screwed into the opening of the container, but in the case of press-fitting, the tightening margin may decrease due to stress relaxation, thermal expansion and contraction, etc. Further, in the case of screwing in, even if screwed in tightly, loosening may still occur due to stress relaxation, vibration, etc. Therefore, in any case, the cap may fall off from the container. To prevent falling off, it is possible to use an adhesive together with these press-fitting and screwing, but if the cap or container is an engineering plastic such as polyamide, polyacetal, polycarbonate or polypropylene that is difficult to adhere, has no effect.

In addition, in the "Construction of the container mouth" published in Japanese Utility Model Publication No. 57-30922, it is planned that the inner plug will be removed. Therefore, "roundness" will be added to the engaging edge of the inner plug. The inside plug is removed when a certain amount of force is applied. The fact that such a "roundness" is attached to the engaging projection edge means that the undercut is set gently with respect to its shape, and thus the undercut is set gently. Therefore, even if one of the axial walls of the inner wall of the inner plug is closed by the top wall, the inner plug can be released from the mold for forming the engaging projection edge. Is.

In addition, in the "container lid" published on the microfilm of Japanese Utility Model Application No. 55-164830 (Japanese Patent Application No. 57-88751), it is planned that the inner lid will be removed. The protrusion is "tilted" so that the inner lid can be removed when a certain amount of force is applied. The fact that such a “slope” is attached to the protrusion means that the undercut is set gently with respect to the shape, and thus the undercut is set gently. Therefore, even if one side of the inner cover in the axial direction of the peripheral wall is closed by the top wall, the inner cover can be released from the mold for forming the protrusion.

As described above, in the prior art published in these publications or microfilms, the inner stopper or inner lid is
It is planned to be removed in the future. Therefore, these conventional techniques cannot be used as they are for the type of cap (blind lid) that the present invention intends to provide. The reason for this is that the undercuts set on these engaging flanges or projections are too loose for this type of cap and do not fit the function of this type of cap that is "non-removable".
Further, the undercut set in these conventional techniques cannot be tightened as it is without "roundness" or "inclination". The reason is that if the undercut is tight, the "non-detachable" function is obtained, but the mold for molding the engaging flange or the protrusion having the tight undercut can remove the tight undercut. This is because the inner plug or the inner lid cannot be released from the mold by overcoming, and it becomes substantially impossible to mold the inner plug or the inner lid.

[Problems to be solved by the device]

In view of the above points, the present invention has an object to provide a cap having a "non-removable" function and also having a sealing function.

[Means for Solving the Problems]

In order to achieve the above object, the cap of the present invention is a cap that is mounted on a cylindrical opening provided with an engagement step portion for preventing slipping out on the outer peripheral surface, and includes a cap body and packing, and the cap body Includes a peripheral wall portion externally inserted in the tubular opening and a ceiling wall portion integrally formed with the peripheral wall portion, the peripheral wall portion protruding inward and retaining engagement with the engagement portion. The top wall portion has an opening for inserting a mold for molding the claw, and the packing is sandwiched between the top wall portion and the opening edge of the tubular opening portion, and the tubular opening portion is provided. Decided to block it.

[Action]

When the top wall portion of the cap body is provided with an opening for inserting a mold for molding a claw like the cap of the present invention having the above-mentioned configuration, the engaging projection edge or the projection portion in the above-mentioned prior art is provided. A corresponding claw, even if it has a shape like an undercut, is molded between both molds by a combination of the mold on the opening side and the mold on the opposite side.
Therefore, the mold releasing direction of the cap body is opposite to the opening-side mold and is opposite to the opening-side mold, and the undercut as in the past must be overcome. No mold release is required, which must be done. Therefore, because the undercut is too tight, without hesitation about the point where molding is impossible,
It is possible to set a tight undercut on the claws, which makes it possible to obtain a reliable "retaining action". Moreover, problems such as leakage of the contents of the container and intrusion of dust from the outside due to the formation of the opening have been solved by the packing.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

1 to 4 according to the first embodiment, the cap is equipped with two members of a cap body (1) and a packing (10), and is attached to a cylindrical opening of a container indicated by reference numeral (13). It is what is done. The cap body (1) is injection molded from synthetic resin such as polyamide or polyacetal, and the packing (10) is molded from synthetic rubber such as nitrile rubber.

The cap body (1) is integrally formed with the ceiling wall portion (2) and the peripheral wall portion (3) and is formed into a cylindrical shape with a lid, and a plurality of caps (four in this embodiment) are formed in the lower portion of the peripheral wall portion (3). Book) claws (4) are evenly arranged. On each side of each claw (4)
The claw (4) is provided with a slit (5) for applying a spring force, the lower end of each claw (4) is made thicker toward the inside of the cap body (1), and the lower surface of this thick part is The cap body (1) is formed in an inclined shape so that it can be easily pushed into the tubular opening (13). Above each claw (4), the top wall portion (2) is provided with a mold insertion opening (6) for molding the claw (4).

The packing (10) that is press-fitted into the cap body (1) is
The top wall (2) and the cylindrical opening (13) of the cap body (1)
The cylindrical opening (13) is closed by being sandwiched between the opening end edges of, and an annular seal projection (11) is integrally provided on the lower surface thereof so as to enhance the sealing force. The packing (10) shown in the figure has a disc shape as a whole, but may have a ring shape having a hole in the center. Further, in the case where the hole is provided in the center as described above, the sealing force can be further enhanced by providing the sealing projection on the upper surface of the packing (10). Various shapes such as a semicircle or a triangle may be considered as the cross-sectional shape of the seal protrusion, and it is also conceivable that a plurality of seal protrusions are concentrically arranged side by side.

The cap having the above structure is used by pressing the packing (10) into the cap body (1) in advance.
When attaching the cap to the cylindrical opening (13), the assembly consisting of the above two members is collectively attached to the cylindrical opening (13), and a load is applied to engage the tip portion of the claw (4). Engage with the step (14). After mounting, the claw (4) is caught in the falling direction with respect to the engagement step (14) and does not come off even if a load is applied in the same direction. The packing (10) is
The top wall (2) and the cylindrical opening (13) of the cap body (1)
It is sandwiched between the edges of the opening and is appropriately compressed, resulting in a sufficient sealing action.

Further, when molding the cap having the above-described structure, each claw (4) has a mold (not shown) on the side of the opening (6) arranged above the claw (4) in FIG. 4) By combining with a mold (not shown) on the side opposite to the opening (6) arranged on the lower side, molding is performed between both molds. Therefore, the mold releasing direction of the cap body (1) is opposite to the mold on the opening (6) side (downward in FIG. 3) and the mold on the non-opening (6) side. On the other hand, since it is on the side of the opening (6) (upward in FIG. 3), it is not necessary to perform mold release which has to overcome an undercut as in the conventional case. Therefore, it is possible to set a tight undercut on the claw (4) without hesitation in this regard, and thereby a reliable "prevention action" can be obtained.

In FIGS. 5 and 6 according to the second embodiment, the claw (4) is a kind of elastic piece and is integrally provided obliquely inside the peripheral wall portion (3) of the cap body (1). . In this embodiment, the three claws (4) are arranged in an equal pattern. A guide protrusion (7) for keeping the cap body (1) substantially concentric with the cylindrical opening (13) is provided between the claws (4) adjacent to each other. Yes (three equally distributed). As shown in the drawing, when the claw (4) is obliquely projected, the mold insertion opening (6) formed in the top wall portion (2) becomes considerably large, and the packing (9) is opened by this opening (6). 6) There is a concern that the seal may get inadequate due to entering the inside. However, as shown in FIG. 7, by adding a plate (8) made of a steel plate such as stainless steel for closing the opening (6), This concern can be resolved.

[Effect of device]

 The present invention has the following effects.

That is, regarding the structure of the cap that is permanently attached to the openings of various containers without being planned to be removed once it is attached, the top wall of the cap body has openings for inserting molds for molding the claws. So that
Since the claws are molded by the combination of a pair of molds, the undercut is too tight, so that it is impossible to mold, and do not hesitate to set a tight undercut on the claws. Is possible. Therefore, by this tight undercut, it is possible to provide a product having a reliable "unstoppable" function in which the claw firmly engages the engagement step portion of the tubular opening portion with the engagement step. Further, even if the opening is provided, the packing has a sufficient sealing action, so that it is possible to prevent the contents of the container from leaking out or the outside dust from entering.

[Brief description of drawings]

FIG. 1 is a sectional view showing a mounted state of a cap according to a first embodiment of the present invention (a sectional view taken along the line AA in FIG. 2),
FIG. 3 is a plan view of the cap, FIG. 3 is a cross-sectional view of the cap body, FIG. 4 is a cross-sectional view showing a state in which the cap is being mounted, and FIG. 5 is mounting of the cap according to the second embodiment of the present invention. FIG. 6 is a sectional view showing the state, FIG. 6 is a sectional view of the cap body, and FIG. 7 is a sectional view showing an example in which a plate is added to the cap according to the second embodiment. (1) cap body, (2) ceiling wall portion, (3) peripheral wall portion,
(4) Claw, (5) Slit (6) Opening, (7) Guide protrusion, (8) Plate, (1
0) Packing (11) Seal protrusion, (13) Cylindrical opening, (14) Engagement step

Claims (1)

[Scope of utility model registration request] 1. A cap mounted on a cylindrical opening (13) having an engagement step (14) on its outer peripheral surface for preventing slipping out, comprising a cap body (1) and a packing (10). The cap body (1) includes a peripheral wall portion (3) externally inserted into the cylindrical opening (13) and a ceiling wall portion (2) integrally formed with the peripheral wall portion (3), (3) is provided with a claw (4) that protrudes inward and engages with the engagement step (14) in a retaining manner, and the top wall (3) molds the claw (4). An opening (6) for inserting a mold is provided, and the packing (10) is sandwiched between the ceiling wall portion (2) and the opening edge of the cylindrical opening portion (13), and the cylindrical opening portion (13).
A cap that is characterized in that it closes.