JPH0565860U - Cap with snap hinge - Google Patents

Abstract

(57) [Summary] [Object] The present invention forms a relief or knurl on the outer periphery of the side wall of a cap body in a cap with a snap hinge used for containers made of plastic and glass. A cap with a snap hinge, which comprises a cap main body in which an opening / closing lid is connected to the upper end of the rear surface through a snap hinge mechanism and a cylindrical side wall member, and which protrudes from the upper end of the side wall on the front surface of the cap main body. A rib is provided on the lower portion of the side wall with a convex portion that projects entirely or partially on the outer periphery, and a groove portion that fits with the rib of the cap body is formed on the upper end portion of the inner wall surface of the front surface of the cylindrical side wall member. A notch portion into which the snap hinge mechanism portion of the cap body is fitted,
In addition, a convex portion that entirely or partially protrudes on the inner periphery that fits with the convex portion on the lower portion of the side wall of the cap body is provided on the lower portion of the inner surface of the side wall of the cap body with the opening / closing lid and the cylindrical shape. The side wall member is fitted and combined.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a snap-hinge cap used for plastic and glass containers, and more particularly to a snap-hinge cap in which the side wall of the cap body forms a double structure.

[0002]

[Prior Art]

 Recently, snap hinged caps have become widely used for plastic and glass containers such as toiletries, cosmetics and foods. In this cap with snap hinge, the upper end of the side wall on the rear surface of the cap body and the lower end of the rear part of the opening / closing lid are connected continuously via the snap hinge mechanism, and the opening / closing lid is not completely opened and closed. In that case, the lid will automatically open or close from that position. The snap hinge mechanism part (150) that controls this function includes the two hinges (154, 155) that are the connection parts between the cap body (100) and the opening / closing lid (200) shown in FIG. 3, and the cap body. The hinge (152) which is a connecting portion with the elastic piece (151), the U-shaped elastic piece, and the hinge (153) which is a connecting portion between the opening / closing lid and the elastic piece are provided. The two hinges (154, 155) at the connecting portion between the cap body and the opening / closing lid on both sides of the piece are rotated by 180 ° back and forth. Next, the snap hinge mechanism in which the opening / closing lid automatically opens and closes will be described with reference to FIG. 5. In the figure in which the opening / closing lid is completely closed (a) and the opening / closing lid is completely opened (c), a U-shape is shown. Although the internal stress of the elastic piece is the minimum, in the state (b) in which the opening / closing lid is in the vertical state, the elastic piece is connected to the cap body and the opening / closing lid on both sides by the connecting portion of the cap body and the opening / closing lid. The U-shape is forcibly opened while the distance is fixed, and the stress inside the elastic piece is maximum. As a result, the elastic piece tries to return to the U-shaped shape of (a) or (c) in which the internal stress is minimized, so that the opening / closing lid automatically opens and closes.

[0003]

[Problems to be Solved by the Invention] As described above, the cap with the snap hinge is very convenient because the opening / closing lid automatically opens and closes. However, the snap hinge mechanism is mechanically located at the upper end of the rear part of the cap. There is a problem that the protrusion is about 3 mm, which is not desirable for the sale of the product, and knurls (provide streak grooves to prevent slipping) and reliefs (engraving letters and decorative patterns) on the side wall of the cap. However, there is a problem in that the mold structure becomes very complicated. For example, when knurling is provided on the side wall of the cap, as shown in FIG. 6A, the knurling (104) exists up to the mold dividing surface (PL-PL), and the molded product is If there is no undercut (the part that becomes caught in the opening and closing direction of the mold), there is no problem, but in general, considering the design or the contact with the finger, Fig. 6 (b) As shown in Fig. 4, many of the rolllets (105) do not reach the dividing surface of the mold and are in the middle, and in the case of relief such as letters and decorative patterns, the molded product is Undercut, which makes it difficult to release the mold. In such a case, the split mold is usually used. However, as shown in FIG. 4, the portions A, B, and C become undercut with respect to the operation of the mold (the XX ^' direction), and are separated. It will not be possible to mold it, or it will be forced out and the shape of the molded product will be significantly impaired. To avoid this, if a slide core structure (partially sliding the undercut part) is provided in the undercut part, the mold structure becomes very complicated, resulting in an expensive mold. Productivity is significantly reduced. The present invention solves the above-mentioned problems by separating the cap with snap hinge into two molded members, and provides a cap with a snap hinge that has good productivity during mass production and has high commercial value. It is a thing.

[0004]

[Means for Solving the Problems]

 The present invention, as shown in FIGS. 1 and 2, includes a cap body (100) in which an opening / closing lid (200) is connected to an upper end of a rear surface through a snap hinge mechanism (150) and a cylindrical side wall member. A cap with a snap hinge consisting of (300), wherein a rib (102) projecting on the upper end of the side wall of the front surface of the cap body, and a convex part (103) projecting entirely or partially on the outer periphery on the lower part of the side wall. A groove (301) is provided at the upper end of the inner surface of the side wall of the front surface of the cylindrical side wall member for fitting with the rib of the cap body, and a groove for fitting the snap hinge mechanism part of the cap body at the upper end of the side wall of the rear surface. The notch (302) is provided, and the inner surface of the side wall of the cap body is fitted with the above-mentioned protrusion on the lower portion of the side wall. Cap body with open / close lid and above A tubular fitting and a side wall member of the combined combination snap hinged caps (10).

The cap body with an opening / closing lid according to the present invention is molded by an injection molding method, and polypropylene, which is a thermoplastic resin having a hinge effect, is generally used as a molding material. In addition to this, polymethylpentene can also be used.

Further, the molding material of the tubular side wall member does not necessarily have to be the same as that of the cap main body with the opening / closing lid, and if necessary, it may be colored or may be transparent or flexible. You may use the thermoplastic resin of.

[0007]

[Action]

 In the cap with snap hinge of the present invention, since the cap body with the opening / closing lid and the cylindrical side wall member having the knurls and reliefs on the outer surface of the side wall are formed by separate molds, the conventional knurls and reliefs are formed into the side wall. Compared to the case of molding the main body with open / close lid on the part, the structure of the mold is simpler, the cost of the mold is lower, and moreover, it is easy to mold and the quality of the molded product is stable, Product management is easy, and productivity during mass production is high.

As described above, in the present invention, the cap main body with the opening / closing lid and the cylindrical side wall member are separately molded in different molds, so that the coloring and the molding material can be changed. come.

Further, in the conventional cap with a snap hinge, the snap hinge mechanism part is mechanically inevitably protruding to the upper end of the rear surface of the cap by about 3 mm, but in the snap hinge cap of the present invention, the outer surface of the side wall of the cap body is Since the tubular side wall member is incorporated in the, the protrusion of the snap hinge mechanism portion is reduced by that much (the thickness of the side wall member).

Further, the combined cap main body with opening / closing lid and the tubular side wall member are fitted with the rib at the upper end of the side wall of the front surface of the cap main body and the groove at the upper end of the inner wall of the front surface of the side wall member. Also, the snap hinge mechanism at the upper end of the rear surface of the cap body fits into the notch at the upper end of the rear surface of the side wall member, and further, the convex portion at the lower portion of the outer surface of the side wall of the cap body and the lower portion of the inner surface of the side wall member. Since it is engaged with the convex portion of the side wall, it is firmly fixed and at the same time, it is possible to position the knurl and the relief provided on the outer surface of the side wall of the side wall member with respect to the cap body.

[0011]

【Example】

 FIG. 1 is a cross-sectional view when a cap with a snap hinge in which a tubular side wall member is combined with a cap body with an opening lid, which is an embodiment of the present invention, is attached to the neck of a container, and FIG. FIG. 3 is a plan view (a) and a sectional view (b) of the tubular outer wall member according to the present invention, and FIG. 3 is a plan view (a) and a sectional view of the cap body with an opening / closing lid according to the present invention. It is (b) and also sectional drawing (b) is explanatory drawing which shows the state at the time of injection molding. Next, this embodiment will be described with reference to the drawings.

First, in order to manufacture a cap body (100) with an opening lid (200) having an outer diameter of 28 mmφ and a total length of 35 mm shown in FIG. 3, an ordinary injection molding machine with a mold clamping pressure of 150 tons is used. Using a four-piece mold, molding was performed under the molding conditions of a resin temperature of 220 ° C. and a molding cycle of 32 seconds, using orange-colored polypropylene as a molding material. As shown in Fig. 3 (b), the molded cap body with the opening lid is ejected from the mold with the opening lid connected to the upper end of the rear surface of the cap body at a right angle. Immediately afterward, the opening / closing lid was mechanically opened / closed several times to give hinge properties to the four hinge portions of the snap hinge mechanism that connects the cap body and the opening / closing lid.

Next, in order to manufacture a cylindrical side wall member (300) having an outer diameter of 28 mmφ and a total length of 30 mm and having knurls which do not reach the upper end and the lower end shown in FIG. Using an injection molding machine of a model, using a four-cavity mold, orange-colored polypropylene was used as a molding material, and the molding was performed at a resin temperature of 220 ° C and a molding cycle of 27 seconds. As for the mold, a knurled mold is an undercut when the mold operates, so a split mold in which the outer circumference of the molded product is divided into three parts of 120 ° was used.

Next, the produced cap body with an opening / closing lid and a tubular side wall member were combined to produce the snap hinge cap (10) of the present invention shown in FIG. Furthermore, in order to evaluate the snap hinged cap of the present invention, the cap was cast on the neck of a stretched polyethylene terephthalate (PET) bottle that was poured into a filling line and filled with 600 ml of water. There were no problems with capping on the filling line. A PET bottle equipped with a cap with a snap hinge according to the present invention was subjected to a 1000 km transportation test and a cap opening / closing test, but no troubles occurred with the fitting of the side wall member on the cylinder and the cap body. It was

When the snap hinge cap of the present invention is attached to the neck of a plastic or glass container, if necessary (particularly in the case of a stoppering type), the container is attached as shown in FIG. If a ring-shaped protrusion (21) is provided on the lower part of the neck (20) and the outer diameter of the protrusion is larger than the inner diameter of the cap body by 0.2 to 0.5 mm, the tubular side wall member is firmly fixed. To be done. At this time, the positional relationship of the height between the lower convex portion (301) on the inner surface of the side wall of the tubular side wall member, the convex portion (103) on the lower side wall of the cap body, and the convex portion on the lower part of the container neck is shown from above. The convex portion on the bottom of the container neck, the convex portion on the lower side wall of the cap body, and the convex portion on the lower inner surface of the side wall of the tubular side wall member prevent the cap from coming off, and the cap has a double structure. Since the ring-shaped convex portion (21) of the container is absorbed by the cap body, the outer wall material does not project to the outside, and the appearance is not unpleasant.

[0016]

[Effect of the device]

 As described above, when the cap with the snap hinge of the present invention is used, the cap body and the side wall member are molded by separate molds, so that the mold structure is relatively simple and the mass production is performed. The knurls and reliefs that could not be conventionally molded can be applied to the side wall of the cap. In addition, the cap body with open / close lid and the side wall members can be colored and the materials can be changed, which improves the commercial value of the product and differentiates it from other products. In addition, it is possible to reduce the protrusion of the snap hinge mechanism on the upper part of the rear surface of the cap, which is inevitable with the conventional cap with a snap hinge.

[Brief description of drawings]

FIG. 1 is a cross-sectional view when a cap with a snap hinge in which a tubular side wall member is combined with a cap body with an opening lid of the present invention is attached to a neck portion of a container.

FIG. 2 is a plan view (a) and a sectional view (b) of a tubular outer wall member according to the present invention.

FIG. 3 is a plan view (a) and a sectional view (b) of a cap body with an opening / closing lid according to the present invention. In addition, the sectional view (b) is
It is explanatory drawing which shows the state at the time of injection molding.

FIG. 4 is an explanatory diagram showing a part that is undercut with respect to the opening / closing direction of the mold and the operation of the mold of the molded product when a split mold is used.

5A and 5B are explanatory views showing the principle of the snap hinge mechanism, in which FIG. 5A is a state in which the opening / closing lid is completely closed, and FIG.
Shows a state in which the opening / closing lid is vertical, and (c) shows a state in which the opening / closing lid is completely opened.

FIG. 6 is an explanatory diagram showing a case where a knurl provided on the side wall of the cap does not undercut the mold (a) and a case where the knurl does not undercut the mold (b).

[Explanation of symbols]

 10 ... Cap with snap hinge 20 ... Container neck 21, 103, 303 ... Projection 100 ... Cap body 104 ... Knurl 105, 304 ... Knurl and relief 101 ... Side wall 102 ... Rib 150 ... Snap Hinge mechanism section 151 ... Elastic pieces 152, 153, 154, 155 ... Hinge 200 ... Open / close lid 300 ... Side wall member 301 ... Groove section 302 ... Notch section

Claims (1)

[Scope of utility model registration request] 1. A cap with a snap hinge, which comprises a cap main body in which an opening / closing lid is connected to an upper end of a rear surface through a snap hinge mechanism and a cylindrical side wall member, wherein the upper end of the side wall of the front surface of the cap main body is provided. A rib projecting on the part, a convex part projecting entirely or partially on the outer periphery at the lower part of the side wall, and a groove part to be fitted with the rib of the cap body on the upper end part of the inner wall of the front surface of the cylindrical side wall member, A notch for fitting the snap hinge mechanism portion of the cap body is provided on the upper end of the side wall of the rear surface, and the entire inner circumference that fits with the convex portion of the lower side wall of the cap body on the lower part of the inner surface of the side wall or A cap with a snap hinge, characterized in that a convex portion that partially projects is provided, and the cap main body with an opening / closing lid and the tubular side wall member are fitted and combined together.