JPH0339905B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention generally relates to a synthetic resin container, and particularly to a synthetic resin container having a structure suitable for large containers such as drums.

The use of synthetic resin for large containers such as drums is
It is extremely effective in reducing weight, improving durability, rust prevention, and impact resistance, and is also considered to be hygienic, so research into commercialization has been underway for some time.

Among large containers, open drums have already been commercialized, and steel is being replaced by synthetic resin.However, as for closed drums, although there are many uses for which synthetic resin is desired, this is not the case. There was nothing that said that. In addition, some products that have been commercialized are barrel-shaped, in contrast to the cylindrical shape of ordinary steel closed drums, in order to achieve structural strength with minimal weight. In addition, there was no protrusion called a chime, which would be a place for gripping the drum when the drum was lifted and transported. For this reason, the existing transportation device used for drum cans could not be used as is, and a new transportation device specifically for containers made of synthetic resin had to be prepared.

Therefore, the transportation method and equipment for synthetic resin containers are different from those for existing steel closed drums, which is a major hindrance to the practical application of synthetic resin closed drums. Unless these issues are resolved, it will be difficult to use synthetic resin for large containers.

The present invention solves the problems associated with the use of synthetic resin by attaching a synthetic resin ring with an integrally molded chime to the container body. To provide a synthetic resin container that can be lifted and transported.

The present invention has a cylindrical container body provided with a groove for engaging the outer wall on the lower side of the periphery of the closed top surface, a chime protruding from the outer upper end, and an upper surface at the inner lower end. It consists of a synthetic resin ring member that is flat and has an integrally formed protrusion that engages with the groove,
The upper surface of the peripheral edge of the container body is formed into an inclined surface, and the cross-sectional shape of the groove is formed to be approximately the same as the ridge, so that the container body and the ring member are integrally connected, and the ring member is used to secure the container. A lifting chime is provided around the top of the main body.

The present invention will be explained in more detail below using specific examples shown in the drawings.

In the figure, reference numeral 1 denotes a cylindrical container body made of synthetic resin with a closed top surface 11 and a bottom surface 12, and a groove 1 for engagement surrounding the outer wall 14 on the lower side of the periphery 13 of the top surface 11.
5 is formed. Further, the peripheral edge 13 is formed to have a slightly smaller diameter than the outer wall 14, the lower side of the groove 15 is a stepped portion 16, and the upper surface of the peripheral edge is formed into an inclined surface.

Reference numeral 2 denotes a ring member made of synthetic resin, which has a required height and wall thickness, and has an inner diameter that fits into the peripheral edge 13.
A chime 21 is attached to the outer upper end of the ring member 2.
is provided protrudingly, and a projecting edge 22 that engages with the groove 15 is integrally formed on the inner lower end.

The projecting edge 22 has a hook-like cross section formed by a substantially flat upper side 22a, a vertical inner side 22b, and a lower side 22c formed at the same angle as the inclined surface, and the groove formed in approximately the same shape. 15.

In the figure, 17 is a reinforcing rib, and 18 is an entrance/exit for the contents, and has a compression 19.

Next, the connection between the container body 1 and the ring member 2 will be explained.

The container body 1 is molded by commonly used blow molding, and the ring member 2 is molded by injection, pressure, or other means. Furthermore, when forming the container body 1, if the entrance/exit 18 is set at the position of the parting line and the compression 19 is provided along the parting line, the shape of the parting line becomes simple, making deburring work easier. It becomes easier.

The fitting of the ring member 2 is as follows:
Preheat. Although this preheating temperature varies depending on the synthetic resin, the elastic modulus decreases when fitting, and the protruding edge 22 fits into the peripheral edge 13 due to pressure from above.
It further fits into the groove 15 and reaches a temperature range in which the upper side 15a of the groove 15 and the upper side 22a of the protruding edge 22 engage with each other.

The preheated ring member 2 is set on the container body 1 using a press-fitting device using hydraulic or mechanical means, and as shown in FIG. be touched. Next, when the ring member 2 is pressed in this state, the protruding edges 22 are pushed apart by the mutual inclined surfaces, move the peripheral edge 13 downward, and are pushed into the groove 15. The lower end of the ring member 2 is in contact with the stepped portion 16, and the protruding edge 22 is fitted into the groove 15 and the groove upper side 1
5a and the projecting edge upper surface 22a engage with each other.

Note that the lower side 22c of the protruding edge 22 does not necessarily have to be at the same angle as the inclined surface of the peripheral edge 13, and may be formed into an appropriate shape to reduce the mutual contact area.
When the container body 1 and the ring member 2 are engaged, there may be a gap between the lower side 22c of the projecting edge 22 and the container body 1.

The preheated ring member 2 shrinks by cooling and is caulked and fixed by annealing shrinkage. As a result, there is no loosening in the connection between the container body 1 and the ring member 2, and the ring member 2 does not deform or come off during transportation or stacking, and the chain 21
Lifting can be easily performed with the

Therefore, in the present invention, even if the container main body is made of synthetic resin, it can be handled in the same manner as a conventional steel closed drum by the ring member engaged with the periphery of the top surface. In addition, since the upper circumferential surface of the closing top surface is formed into an inclined surface, the ring member can easily come into contact with the upper part of the container body, and even if a flattening load is generated when the ring member is press-fitted, the ring member will be tilted due to the flattening load. This has the advantage that the container body and the ring member can be connected very easily, such as the projecting edge portions being evenly spread and engaging with the grooves without causing any problems.

[Brief explanation of the drawing]

The drawings show one specific example of the synthetic resin container according to the present invention, in which Fig. 1 is a perspective view, Fig. 2 is a sectional view taken along the line of Fig. 1, and Fig. 3 shows a ring member brought into contact with the upper surface of the periphery. FIG. 4 is a partial vertical cross-sectional view showing a state in which the container body and the ring member are connected. 1... Container body, 2... Ring member, 11...
Top surface, 13...periphery, 14...outer wall, 15...
groove, 21... chiaim, 22... ridge.

Claims (1)

[Claims] 1 A cylindrical container body with a groove for engaging around the outer wall on the lower side of the periphery of the closed top surface, a chime protruding from the upper outer end, and a groove with a flat upper surface on the inner lower end to engage with the groove. A ring member made of synthetic resin is integrally formed with a mating flange, and the upper surface of the periphery of the container body is formed into an inclined surface, and the cross-sectional shape of the groove is formed to be approximately the same as the flange. A synthetic resin container formed by integrally joining a main body and a ring member with a chime.