JPH0260415B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for attaching a press-fit flange to a container such as a drum can.

Conventional technology In order to attach this type of flange to the top plate of a drum, conventionally, an annular gasket is fitted and covered over the cylindrical part of the flange, and the flange with the gasket is press-fitted from below into the cylindrical mouth part of the top plate. The upper end of the cylindrical part is wrapped around the upper end of the cylindrical mouth part, and the polygonal outer periphery of the flange collar is wrapped around the same polygonal shape around the cylindrical mouth part of the top plate in order to prevent rotation of the flange and seal the gasket housing part. It was engaged with the inner surface of the hem of the shape. However, due to manufacturing errors in the flange or top plate, or due to misalignment between the polygonal flange and the hem, there is a gap between the outer periphery of the flange and the hem. There was a problem that the gasket swelled and a part of it protruded from the gap, impairing the sealability and causing the contents to leak, or the gasket was quickly eroded by the contents and lost its airtightness. .

Therefore, the present applicant has previously provided a fixing device for a press-fit type flange made of a thin metal plate in a container such as a drum can, in which a gasket accommodating recess is provided in the brim of the flange and a gasket is sealed in the recess (Utility Model Application No.
(See Publication No. 196639). However, in the device proposed earlier, the lower surface of the horizontal step and the upper surface of the flange are in plane contact over a relatively wide range, so the presence of irregularities or distortions in the plate-like material may cause A gap is likely to occur between the two, resulting in poor airtightness.Also, the polygonal outer peripheral edge of the tsuba and the same polygonal hem may be caused by manufacturing errors in the flange or top plate, or Due to the misalignment between the tsuba and hem,
There was also the problem that a gap was likely to occur between the two, resulting in poor airtightness.

Purpose of the Invention The purpose of the present invention is to solve the above-mentioned problems, to completely seal the flange attachment part of containers such as drums twice, to reliably enclose a gasket, and to prevent the conventional swelling. Not only will there be no leakage of contents or loss of airtightness due to the protrusion of the gasket, but the amount of gasket used will be extremely small.
The object of the present invention is to provide an inexpensive method for attaching a press-fit flange to a container such as a drum can.

Composition of the Invention In order to achieve the above object, the present invention provides a press-fit type flange for a container such as a drum can with a circular annular protrusion projecting upwardly on the flange having a polygonal outer peripheral edge. A gasket accommodating space is formed between the part and the cylindrical part of the flange, and a gasket is fitted into the gasket accommodating space, and the bottom part has a polygonal horizontal cross section and is connected to the top plate of a container such as a drum can. , an inclined surface part of the flange fixing part, which is constituted by an annular stepped part extending horizontally from the upper edge thereof, and a cylindrical mouth part extending upwardly from the inner edge of the stepped part through the inclined surface part. A downward annular protrusion that is circular when viewed from the plane that enters the gasket housing space from above is provided, and the flange with the gasket is press-fitted from below inside the flange fixing part,
The upper end of the cylindrical part of this flange is wound around the upper end of the cylindrical mouth, and the downward annular protrusion of the inclined surface is inserted into the gasket housing space from above, and the downward annular protrusion presses down the gasket. The portion between the annular step portion corresponding to the corner of the lower edge of the outer periphery of the protrusion and the inclined surface portion is bent from above by pressing along the corner, and the elastic restoring force of the top plate material is reduced at the bent portion. A press-fit type flange for containers such as drums, characterized in that the inner surface of the outer peripheral edge of the annular stepped portion is brought into close contact with the upper surface of the outer peripheral edge of the collar, and the inner surface of the lower edge of the inclined surface portion is brought into close contact with the upper edge of the annular protrusion. It outlines how to install it.

Embodiments Next, embodiments of the present invention will be described based on the drawings.

1 and 2, the method of the invention is carried out as follows.

First, an upward annular protrusion 6 which is circular when viewed from a plane is provided by press working on the collar 3 having the polygonal outer peripheral edge 3a of the press-fit type flange 2 for drum cans, and a cylindrical part having the annular protrusion 6 and the female threaded part 5 of the flange 2 is formed. A gasket accommodating space 7 is formed between the gasket 4 and the gasket 8, and a gasket 8 is fitted into this gasket accommodating space 7. As this gasket 8, it is preferable to attach a gasket made of silicone rubber with a lining, but it is also possible to use an O-ring, an annular gasket with a square cross section, or a sealing type that is sealed in the so-called chime part of the drum.・Compounds may be used.

On the other hand, the top plate 1 includes a hem portion 11 having a polygonal horizontal cross section and extending from the top plate 1 at a predetermined position, and an annular step portion 12 extending horizontally from the upper edge of the hem portion 11. A flange fixing part 10 is formed by a cylindrical mouth part 13 that extends upright from the inner edge of the flange fixing part 13 via an inclined surface part 14, and a gasket housing space is provided on the inclined surface part 14 of the flange fixing part 10. A downward annular protrusion 16 that is circular when viewed from the plane that enters into the flange fixing portion 10 from above is provided, and the flange 2 with the gasket 8 is fitted from below inside the flange fixing portion 10, and both are pressed into the lower mold 17 of the press.
Then, by pressing the flange 2 from above with the upper mold 18 of the press having the concave groove 19 for winding the upper end of the flange cylinder part and the outer annular pressing protrusion 20, the flange 2 is pressed from above. The flange 2 with the gasket 8 is press-fitted into the inside of the flange fixing part 10 of the top plate 1 from below, and the upper end 4a of the cylindrical part 4 of this flange 2 is aligned with the groove 19 of the upper mold 18, and the cylindrical mouth part 13, the downward annular protrusion 16 of the inclined surface part 14 is inserted into the gasket housing space from above, and the downward annular protrusion 16 presses down the gasket 8, and the lower edge of the outer periphery of the annular protrusion 6 The part between the annular step part 12 and the inclined surface part 14 corresponding to the corner is pressed from above along the corner by the annular pressing protrusion 20 of the upper mold 18 to bend the part, and the bent part is bent. At P, the elastic restoring force of the top plate material causes the inner surface of the outer peripheral edge of the annular stepped portion 12 to come into close contact with the upper surface of the outer peripheral edge of the collar 3, and the inner surface of the lower edge of the inclined surface portion 14 to the upper end of the annular protrusion 6, respectively. It is something.

Here, when the flange 2 is press-fitted into the flange fixing part 10 of the top plate 1, the downward annular protrusion 16
is inserted from above into the gasket housing space 7 between the upward annular protrusion 6 and the cylindrical part 4 of the flange 2, so that the upward annular protrusion 6 is covered from above by the chevron-shaped inclined surface part 14. Therefore, the adhesion between the upward annular protrusion 6 and the inclined surface part 14 is very good, and the gasket 8 is attached to the downward annular protrusion 1.
6, and therefore has excellent airtightness. In addition, the volume of the space 15 becomes smaller as the downward annular protrusion 16 enters.
There is an advantage that the amount of gasket 8 used can be reduced.

In addition, the bent portion P between the annular step portion 12 and the inclined surface portion 14 of the top plate 1, which is deformed by the annular pressing protrusion 20 of the upper die 18, is affected by the elastic restoring force (so-called spring force) of the top plate material. Since a force is always applied to return to the inclined state before the pressing deformation due to the bending (back), the inner surface of the outer peripheral edge of the annular step 12 on one side of the bent portion P is on the outer peripheral edge of the collar 3, and on the other side In this case, the inner surface of the lower edge of the inclined surface portion 14 is firmly pressed against the outer peripheral edge of the upper end portion of the annular protrusion 6, thereby improving airtightness.

In the above embodiment, the upward annular protrusion 6 of the flange 3 of the flange 2 is formed by press working, and an annular groove is formed on the back side of the flange 3 in correspondence with the annular protrusion 6. In some cases, only the annular protrusion 6 is formed by pressing the collar 3 from above, and the annular groove is not formed. Further, the annular protrusion 6 may be formed on the upper surface of the collar 3 by cutting other materials instead of by pressing. Furthermore, although the female threaded portion 5 is provided on the inner surface of the cylindrical portion 4 of the flange 2 by cutting, it goes without saying that such female threaded portion 5 may be provided by rolling. In addition, gasket 8
However, if a lining gasket is used, the installation work is very easy, and the presence of the annular protrusion 6 prevents the liquid gasket material from flowing down when lining the gasket 8, making the work easier. There is. Further, similar advantages can be obtained when a sealing compound is used as the gasket 8. Further, as the gasket 8, other ordinary annular gaskets made of rubber, synthetic resin, or asbestos may of course be used.

The method of attaching a press-fit flange of the present invention is similarly applicable to containers of the same type, such as gallon cans, in addition to drum cans.

Effects of the Invention As described above, the present invention provides a circular upward annular protrusion 6 when viewed from a plane on the flange 3 having the polygonal outer peripheral edge 3a of the press-fit flange 2 for containers such as drums. A gasket accommodating space 7 is formed between the flange 2 and the cylindrical portion 4, and a gasket 8 is fitted into this gasket accommodating space 7, and the horizontal cross-sectional polygonal shape is connected to the top plate 1 of a container such as a drum can. It consists of a hem part 11, an annular step part 12 that extends horizontally from the upper edge of the hem part 11, and a cylindrical mouth part 13 that extends upright from the inner edge of this part via an inclined surface part 14. flange fixing part 10
A downward annular protrusion 16 is provided on the inclined surface portion 14 of the gasket 8, and the flange 2 with the gasket 8 is press-fitted into the inside of the flange fixing portion 10 from below. The upper end 4a of the cylindrical portion 4 of this flange 2 is connected to the cylindrical opening 1
3, the downward annular protrusion 16 of the inclined surface part 14 is inserted into the gasket housing space from above, and the downward annular protrusion 16 presses down the gasket 8, and the lower edge of the outer periphery of the annular protrusion 6 An annular step portion 12 and an inclined surface portion 14 corresponding to the corners of
The part between the top plate and the top plate is bent by pressing from above along the corner, and at the bent part P, the elastic restoring force (so-called spring back) of the top plate material changes the tilted state before the pressure deformation. Therefore, the inner surface of the outer circumferential edge of the annular stepped portion 12 on one side of the bent portion P is on the upper surface of the outer circumferential edge of the collar 3, and the lower surface of the inclined surface portion 14 on the other side. The inner surface of the edge is firmly pressed against the outer peripheral edge of the upper end of the annular projection 6. In this case, in particular, since the annular protrusion 6 is circular when viewed from the plane, the inner surface of the lower edge of the inclined surface part 14 is uniformly brought into close contact with the outer peripheral edge of the upper end of the protrusion 6 over the entire circumference of the protrusion 6. Therefore, the gasket 8 can be reliably sealed in the space 15 between the annular protrusion 6 and the cylindrical opening 13, and the flange of the top plate 1 can be sealed tightly. 2 mounting parts can be completely sealed. For this reason, as in the conventional case, the swelling gasket 8 protrudes and the sealability is impaired, the gasket 8 is early attacked by the contents and the contents leak, or the airtightness is lost. There is no fear at all. In addition, when the flange 2 is press-fitted into the flange fixing part 10 of the top plate 1, the downward annular protrusion 6 is inserted from above into the gasket housing space 7 between the upward annular protrusion 6 of the flange 2 and the cylindrical part 4. As a result, the upward annular protrusion 6 is covered from above by the chevron-shaped inclined surface part 14.
The adhesion between the upward annular protrusion 6 and the inclined surface part 14 is very good, and the gasket 8 is pressed down by the downward annular protrusion 16, thus providing excellent airtightness. Furthermore, the volume of the space 15 is reduced by the insertion of the downward annular protrusion 16, resulting in the effect that less gasket 8 is required.

[Brief explanation of drawings]

FIG. 1 is a partial vertical cross-sectional view of a flange and a top plate before they are combined by the method of the present invention, and FIG. 2 is a partial vertical cross-sectional view of the press showing the state in which the flange is attached. 1... Top plate, 2... Flange, 3... Tsuba, 3a
... Polygonal outer periphery, 4 ... Cylinder part, 4a ... Upper end part, 5 ... Female threaded part, 6 ... Upward annular projection, 7
...Gasket accommodation time〓, 8...Gasket, 1
0...Flange fixing part, 11...Hem part, 12...
Annular step part, 13... Cylindrical mouth part, 13a... Upper end part, 14... Inclined surface part, 15... Space part, 16...
...Downward annular protrusion.

Claims (1)

[Claims] 1. A press-fit type flange 2 for containers such as drums is provided with a circular upward annular protrusion 6 when viewed from a plane on the flange 3 having a polygonal outer peripheral edge 3a, and a gasket is inserted between the annular protrusion 6 and the cylindrical portion 4 of the flange 2. A storage space 7 is formed, and a gasket 8 is fitted into this gasket storage space 7, and a hem 11 having a polygonal horizontal cross section connected to the top plate 1 of a container such as a drum is connected to the upper edge of the hem 11. Annular stepped portion 12 that extends horizontally
and a cylindrical mouth part 13 that extends upright from the inner edge of the flange fixing part 10 via an inclined surface part 14. The flange 2 with the gasket 8 is press-fitted into the inside of the flange fixing part 10 from below, and the upper end 4a of the cylindrical part 4 of the flange 2 is inserted into the cylindrical mouth part 13. Wrap it around the upper end 13a, insert the downward annular protrusion 16 of the inclined surface part 14 into the gasket housing space from above, and press down the gasket 8 with the downward annular protrusion 16. The part between the annular step part 12 and the inclined surface part 14 corresponding to the corner part is pressed from above along the corner part to bend it, and the bent part P is bent.
The elastic restoring force of the top plate material allows the inner surface of the outer peripheral edge of the annular stepped portion 12 to be brought into close contact with the upper surface of the outer peripheral edge of the collar 3, and the inner surface of the lower edge of the inclined surface portion 14 to be brought into close contact with the upper end of the annular protrusion 6, respectively. A method for attaching a press-fit flange to a container such as a drum, characterized by: