JPS6328112Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a biaxially stretched bottle with a base cup attached to the bottom of the bottle.

Biaxially stretched synthetic resin bottles have rapidly become popular, especially as containers for carbonated beverages such as beer, because the bottle walls can be made thinner, saving material and providing superior mechanical strength. ing. However, due to the technique used, the bottom of this biaxially stretched bottle inevitably bulges out into a hemispherical shape, making it unstable to sit on. Therefore, a pedestal called a base cup (also called a hakama) is installed at the bottom of the bottle. This is then fixed to the bottom of the bottle with an adhesive so that it can stand up stably.

As the adhesive, a hot melt adhesive is usually used. Due to its nature, hot melt adhesives soften at temperatures above a certain temperature, causing the bonded material to move due to external force, and in some cases may peel off. There is a disadvantage that it cannot be used for bottles that are heat-treated at temperatures of 70°C to 80°C after filling.

In view of the above points, the present invention has a mounting structure in which the base cup is fixedly attached to the bottom of the bottle without using adhesives, and therefore, the base cup can be stably fixed regardless of temperature changes. The purpose is to provide bottles.

An embodiment of the present invention will be described below with reference to the accompanying drawings. In the drawing, 1 is a synthetic resin bottle formed by biaxially stretching a bottle-shaped cold parison made of, for example, saturated polyester resin, and the bottom part 2 is a spherical bottle. The base cup 3 has a shape that bulges downward, and therefore has a stable shape and is fitted onto the bottom 2 of the bottle.

Here, in the present invention, as shown in the figure, the bottle 1 has a short cylindrical protrusion 4 projecting downward integrally formed in the center part of the bottle bottom 2 that hangs down most downwardly, and the lower part of the protrusion 4 A locking protrusion 5 is formed on the outer periphery, and the base cup 3 has a cup shape with a peripheral wall 7 that fits into the lower part of the bottle body erected from the peripheral edge of the bottom wall 6. The inner center part is left as a bottom seat 8, and the inner center part is deeply recessed upward to form a receiving seat 9 that supports the bottle bottom 2. The bottom part is cut to make a circular hole through which the protrusion 4 passes, and a peripheral part around the hole that is inclined inwardly and downwardly engages with the upper surface side of the protrusion 5 for locking. It is formed into a piece 10.

Therefore, when the base cup 3 is fitted and attached to the bottle bottom 2, the protrusion 4 of the bottle bottom 2 penetrates downward through the hole in the center of the bottom wall 6 of the base cup 3, so that the downward locking piece 10 is inserted as shown in the figure. is engaged with the locking protrusion 5 from above, and as a result, the base cup 3 is firmly attached to the bottle bottom 2 without slipping out, and at this time, the receiving seat 9 supports the bottle bottom 2.

In the above, the protrusion 4 of the bottle bottom 2 has a cylindrical shape, but it may have a hollow shape that closes the lower end surface and communicates with the bottle 1 inside. Furthermore, the locking protrusion 5 of the protrusion 4 only needs to be able to lock the locking piece 10 on the base cup 3 side, so it may be an intermittent protrusion, and is not limited to the protrusion 5. For example, it may be a grooved strip. In this case, the tip of the locking piece 10, that is, the inner peripheral edge, is bent horizontally so that this bent end surface can be fitted into the groove. Furthermore, if an appropriate number of cuts are made in the locking piece 10 in the radial direction from the inner peripheral edge side, fitting with the protrusion 4 will be facilitated.

Next, regarding the protrusion 4 itself on the bottle bottom 2, it is convenient to use the bar-shaped protrusion that is formed on the bottle bottom so as to protrude downward during bottle-shaped cold parison molding. That is, when manufacturing a cold parison by injection molding, as is well known,
Since the gate of the mold is located at the center of the bottom of the cold parison, a gate-shaped protrusion, that is, a round bar-shaped protrusion, is inevitably formed integrally at the center of the bottom of the molded cold parison. Ru.
Normally, this rod-like protrusion is unnecessary, so it is cut from the base. In the present invention, this bar-shaped protrusion may be cut from the middle, leaving a portion to serve as the protrusion 4. In addition, the locking protrusion 5 of this protrusion 4
(or the groove for engagement) can be easily formed integrally during cold parison molding.

In the above-mentioned present invention, a protrusion 4 protruding downward is provided at the center of the bottle bottom 2, while a bottom wall 6 of the base cup 3
A hole is drilled in the center, and a locking piece 10 is placed around the hole.
When the base cup 3 is fitted and attached to the bottle bottom 2, the locking piece 10 is locked to the 4 protrusions and fixed to the bottle bottom 2, and no adhesive is used as in the conventional case. Therefore, the fixed state of the base cup 3 can always be maintained stably regardless of temperature. Moreover, it can be fitted onto the bottle bottom 2 with just one touch, and is convenient because it does not require the trouble of managing and applying it, unlike fixing with adhesive. Furthermore, if the bar-like protrusion of the cold parison is directly used as the protrusion 4 of the bottle bottom 2 as described above, no special mold or special technique is required to form the protrusion 4. It has the advantage of being easy to configure.

[Brief explanation of the drawing]

The accompanying drawing is a sectional front view showing the bottom of the bottle and the base cup of the biaxially stretched bottle with the base cup of the present invention. 1... Synthetic resin bottle, 2... Bottle bottom, 3... Base cup.

Claims (1)

[Scope of utility model registration request] A bottle 1 made of synthetic resin has a protrusion 4 protruding downward from the center of the bottom 2 which bulges downward in a hemispherical shape, and a locking part 5 in the form of a protrusion or groove on the outer surface of the lower part of the protrusion 4; It has a cup shape with a peripheral wall 7 that fits into the lower part of the body of the bottle 1 standing up from the periphery of the wall 6, and the center part of the bottom wall 6 is deeply recessed upward to form a receiving seat 9 that supports the bottle bottom 2, The central part of this receiving seat 9 is shallowly recessed downward in the shape of an inverted cone, a hole is made in the bottom of this recess through which the projection 4 passes, and a locking piece 10 inclined inwardly and downwardly around this hole is inserted into the recess. A biaxially stretched bottle with a base cup consisting of a base cup 3 which is secured to a bottom 2 part of the bottle by being engaged with a locking part 5.