JPH0333649Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a composite plug for containers such as drums.

BACKGROUND TECHNOLOGY Conventionally, plugs for sealing the mouths of drums, for example, have been mainly made of metal, but these have had the disadvantage of poor corrosion resistance.

Therefore, conventional plugs have been developed that are made of synthetic resin with excellent corrosion resistance (see Japanese Patent Publication No. 46-30353), and that include a synthetic resin lid body and a metal plate sealing member that is fitted over the entire upper surface of the lid body. (Jikko 57
-Refer to Publication No. 4605) have been proposed.

Problems the invention aims to solve However, although plugs made only from conventional synthetic resins do have excellent corrosion resistance against the contents of containers such as drums, they still have low strength and poor heat resistance and weather resistance. There was a problem.

In addition, a conventional composite plug that includes a synthetic resin lid and a metal plate sealing member that is fitted over the entire top surface of the lid is applicable to relatively small containers such as oil cans, food and water cans, and paint cans. It was loosely inserted into the open upper part of the can top plate, and in this state, the sealing member and the lower side wall of the lid were expanded outward using a special expansion tool to attach the lid. Therefore, such conventional composite plugs require an expansion tool to install the plug, and such expansion tools generally have a complicated structure and are expensive, as well as being difficult to expand. Attaching the plug using a tool is relatively troublesome, and requires skill as the lower part of the side wall of the plug needs to be expanded uniformly, and installation errors due to improper expansion can lead to leakage of the contents. The problem was that it was easy to occur. Furthermore, in conventional composite plugs, the sealing member is simply placed on the lid before being attached to the can, and the two are not connected.
There is a problem in that these parts may come apart when handling them before installation, making handling very troublesome. Of course, if the lid body and the sealing member were to be joined via an adhesive, the two would be integrated, but there was a problem in that the cost of the plug would increase accordingly.

The purpose of this invention was to solve the above problems, provide sufficient strength, and have excellent corrosion resistance, heat resistance, and weather resistance, and also eliminate the need for special expansion tools unlike conventional ones. It is sufficient to use a simple plug opening/closing tool (plug opening/closing wrench) that is generally used for opening and closing metal plugs such as drum cans, and the plug can be installed reliably without requiring any skill. To provide a composite plug for a container such as a drum can, which has excellent sealing performance, is easy to handle, has extremely low manufacturing cost, and can be manufactured easily.

Means for Solving the Problems In order to achieve the above object, this invention has a male screw provided on the outer surface of the peripheral wall, an annular recess for accommodating a seal on the upper side of the male screw, and a plurality of plug opening/closing tool hooks on the inner surface of the peripheral wall. A composite plug for containers such as drums, which includes a synthetic resin plug body provided with a protrusion, a metal covering plate fitted over the entire upper surface of the plug body, and a packing fitted into an annular recess. A hanging wall is provided on the outer peripheral edge of the top wall that extends to the upper end of the surrounding wall of the metal covering plate, and the top wall that continues to the surrounding wall of the plug body is fitted inside the upper end of the surrounding wall of the metal covering plate, the top wall, and the hanging wall. A required number of engaging portions are provided at one of the intermediate height of the inner surface of the peripheral wall of the plug body and the intermediate height of the peripheral wall of the metal covering plate, and the required number of engaging portions are provided on the other,
An engaging protrusion for preventing the covering plate from rising is provided, and the engaging protrusion is engaged with the engaging part, and a hollow protrusion is provided on the peripheral wall of the metal covering plate to cover the protruding part for hooking the plug opening/closing tool on the plug body. The subject matter is a composite plug for containers such as drums, which is characterized by being provided with a section.

Embodiment Next, an embodiment of this invention will be described based on the drawings.

In the drawing, reference numeral 1 denotes a composite plug for drum cans according to this invention, which consists of a plug body 2 made of synthetic resin such as polyethylene, polypropylene, or nylon, which has a male thread 5 on the peripheral wall 4, and an iron plate and aluminum covered over the entire upper surface of the plug body 2. It is equipped with a metal covering plate 3 such as a plate, and a packing 27,
A seal-accommodating annular recess 28 is provided above the male thread 5 of the plug body 2, and the seal 2 is inserted into the annular recess 28.
7 is fitted.

Convex portions 6, 6 for hooking plug opening/closing tools are provided on both left and right sides of the circumferential wall 4 of the plug body 2, facing each other.
Hollow protrusions 11, 11 having the same shape as the protrusions 6, 6 and slightly larger than the protrusions 6, 6 are provided in the protrusions 11, 1.
Convex portions 6, 6 are fitted into the inside of 1. In addition, a top wall 12 continuous to the upper end of the peripheral wall 10 of the metal covering plate 3
A short hanging wall 13 is provided on the outer edge of the metal cover plate 3, and the upper end of the peripheral wall 10, the top wall 12, and the hanging wall 13
A top wall 7 connected to the peripheral wall 4 of the plug body 2 is fitted inside the plug body 2 .

A required number of engagement recesses 9 are provided in the middle of the height of the inner surface of the peripheral wall 4 of the plug body 2, and a metal cover plate 3 is provided with a cover plate for preventing the cover plate from floating up, which engages with each engagement recess 9. Engagement protrusions 14 are provided, and the engagement between the two prevents the metal covering plate 3 from lifting up. Although the peripheral wall 4 of the plug body 2 needs to be thick so as to withstand rotational torque, the top wall 7 and bottom wall 8 thereof may be thin.

The metal covering plate 3 is made of a pressed metal plate, while the plug body 2 is made of a synthetic resin molded product separately from the metal covering plate 3. Then, the outer diameter of the metal cover plate 3 is made slightly larger than the inner diameter of the synthetic resin plug body 2, and the metal cover plate 3 is forcibly press-fitted into the plug body 2 to connect the two. desirable.

Reference numeral 15 denotes an annular packing made of an elastic material such as synthetic rubber or synthetic resin, which is attached to the outer periphery of the upper part of the composite plug 1.

Note that the composite plug 1 can also be manufactured by integrally molding the plug body 2 made of synthetic resin with the metal cover plate 3 made of a pressed product of a metal plate. In this case, although not shown in the drawings, instead of the above-mentioned engagement recesses 9 and engagement protrusions 14, a required number of engagement holes are drilled in at least the peripheral wall 10 of the metal covering plate 3, and a synthetic resin During integral molding, the synthetic resin raw material is poured into these engagement holes to form engagement protrusions on the plug body 2, and the metal coating is formed by the engagement of the engagement holes and the engagement protrusions. It is also possible to prevent the plate 3 from floating up.

The outer surface of the metal covering plate 3 is subjected to anti-rust treatment such as painting or plating. In addition, when the metal cover plate 3 is made of iron plate, in order to withstand the tightening force during sealing,
For plug 1, which has a large drum diameter, its thickness should be
For plugs 1 with small diameters, the thickness should be 0.3 mm or more, and a sufficiently strong iron plate should be used.

In other drawings, 21 is the top plate of the drum;
Reference numeral 22 denotes a rising cylinder part provided at a required location on the top plate 21 in an upwardly projecting manner, and an annular step part 2 is provided at the center of its height.
3 is provided. 24 is an annular convex portion provided on the top plate 21 around the rising cylinder portion 22; 25;
is a so-called internally threaded flange that is press-fitted into the rising cylindrical portion 22 from below, and its upper edge is bent outward and wound around the upper edge 22a of the rising cylindrical portion 22. The outer circumferential edge of the collar 26 at the lower edge of the flange 25 has an octagonal shape when viewed from above, and is engaged with the inner circumferential edge of a rotation-preventing hem 22b of the same shape below the step portion 23. Reference numeral 29 denotes a fixed gasket filled between the annular step portion 23 of the rising cylinder portion 22 and the collar portion 26 of the flange 25.

The composite plug according to this invention can be applied not only to drums but also to plugs for containers such as gallon cans that have the same type of mouthpiece.

Effects of the invention As described above, this invention includes a male screw 5 provided on the outer surface of the peripheral wall 4, a seal-accommodating annular recess 28 provided above the male screw 5, and a plurality of protrusions 6 for hooking plug opening/closing tools on the inner surface of the peripheral wall. , 6, a metal cover plate 3 fitted over the entire upper surface of the plug body 2, and a packing 27 fitted into an annular recess 28. A hanging wall 13 is provided at the outer peripheral edge of the top wall 12 that is continuous with the upper end of the peripheral wall 10 of the metal covering plate 3, and inside the upper end of the peripheral wall 10 of the metal covering plate 3, the top wall 12, and the hanging wall 13,
The top wall 7 connected to the peripheral wall 4 of the plug body 2 is fitted, and the lower end of the hanging wall 13 of the metal covering plate 3 is not folded back to the lower surface of the top wall 7 of the plug body 2. The lower packing-accommodating annular recess 28 is wide open, into which a sufficiently thick packing 27 can be fitted, and therefore has excellent sealing performance.

And in this way, the hanging wall 1 of the metal covering plate 3
Since the lower end of 3 is not folded back to the bottom surface of the top wall 7 of the plug body 2, the plug body 2
However, in this invention, one of the middle part of the height of the inner surface of the circumferential wall 4 of the plug body 2 and the middle part of the height of the circumferential wall 10 of the metal cover plate 3 is separated. A required number of engagement portions (engagement recesses or engagement holes) 9 are provided on the other side, and an engagement protrusion 14 for preventing the cover plate from rising is provided on the other side.
Since the engagement protrusion 14 is engaged with the engagement portion 9, it goes without saying that the plug body 2 and the metal covering plate 3 will not separate, and the composite plug 1 as a whole has sufficient strength. It has excellent corrosion resistance, heat resistance, and weather resistance, and is easy to handle.

Furthermore, since the peripheral wall 10 of the metal covering plate 3 is provided with hollow parts 11, 11 that cover the protrusions 6, 6 for hooking the plug opening/closing tool of the plug body 2, the composite plug 1 or the like can be used for drum cans, etc. A simple plug that can be attached to the fixed cap of a container, does not require special expansion tools like conventional ones, and is generally used for opening and closing metal plugs such as drums. Opening/closing tool (plug opening/closing wrench)
The plug can be installed reliably without requiring any skill.

The composite plug 1 also includes a plug body 2 made of synthetic resin, and a cover plate 3 made of a pressed metal plate.
Since the material cost is low and the manufacturing cost is extremely low, the plug body 2 is made of Since there is no need to perform troublesome processing such as folding back the lower surface of the top wall 7, the manufacturing thereof is extremely easy.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; FIG. 1 is a partial cross-sectional view of a drum mouthpiece to which the invention is attached, and FIG. 2 is a partially cutaway plan view of the invention. DESCRIPTION OF SYMBOLS 1...Composite plug, 2...Synthetic resin plug body, 3...Metal cover plate, 4...Peripheral wall, 5...Male thread, 6...Protrusion for hooking a plug opening/closing tool, 9
...Engaging recess (engaging portion), 10... Peripheral wall, 11...
...Hollow convex portion, 14...Engaging protrusion for preventing lifting of the covering plate, 21...Top plate, 25...Flange.

Claims (1)

[Scope of utility model registration request] A male thread 5 is provided on the outer surface of the peripheral wall 4.
A plug main body 2 made of synthetic resin, which is provided with a seal-accommodating annular recess 28 on the upper side and a plurality of protrusions 6, 6 for hooking plug opening/closing tools on the inner surface of the peripheral wall, and a metal fitted over the entire upper surface of the plug main body 2. In a composite plug for containers such as drums, which includes a metal covering plate 3 and a packing 27 fitted into an annular recess 28, a hanging wall 13 is provided on the outer peripheral edge of a top wall 12 that continues to the upper end of a peripheral wall 10 of the metal covering plate 3. A top wall 7 connected to the peripheral wall 4 of the plug main body 2 is fitted inside the upper end of the peripheral wall 10, the top wall 12, and the hanging wall 13 of the metal covering plate 3, and the inner surface of the peripheral wall 4 of the plug main body 2 A required number of engagement portions 9 are provided on one of the intermediate portion of the height of the metal covering plate 3 and the intermediate portion of the height of the peripheral wall 10 of the metal covering plate 3, and the engagement portion 9 for preventing the covering plate from rising is provided on the other side. A protrusion 14 is provided, the engagement protrusion 14 is engaged with the engagement portion 9, and the metal covering plate 3
A composite plug for containers such as drums, characterized in that a peripheral wall 10 is provided with hollow protrusions 11, 11 that cover plug opening/closing tool hooking protrusions 6, 6 of a plug body 2.