초록 ▼

A plug for the sealing closure of an opening in a sheet includes an integral body including a cap portion having an annular shirt portion and a cover portion connected to one end of the shirt portion. The body further includes a flange portion extending obliquely outwardly and downwardly and an ann

A plug for the sealing closure of an opening in a sheet includes an integral body including a cap portion having an annular shirt portion and a cover portion connected to one end of the shirt portion. The body further includes a flange portion extending obliquely outwardly and downwardly and an annular sealing surface approximately at the same level as the connection of the cover portion to the shirt portion and below the connection of the flange portion. The plug body can be urged into the opening by an axial pressure. An outward pivoting of the flange portion upon insertion of the plug body into the opening exerts a radial expansion force and/or a pivoting force on the sealing surface so that the body's material in the area of the sealing surface is formed against the other side of the sheet.

대표청구항 ▼

What is claimed is: 1. A plug for sealing an opening in a sheet, said plug comprising an integral body, an entirety of said body being made of the same material, said body including: a cap portion having an annular shirt portion and a cover portion connected to one end of the shirt portion, the shi

What is claimed is: 1. A plug for sealing an opening in a sheet, said plug comprising an integral body, an entirety of said body being made of the same material, said body including: a cap portion having an annular shirt portion and a cover portion connected to one end of the shirt portion, the shirt portion having a free end opposite to the cover portion and tapering on an outer side thereof towards the free end, the free end having an outer diameter adapted to be smaller than the diameter of the opening, wherein said cover portion is configured to prevent liquid from passing therethrough; a flange portion approximately at the level of the cover portion, which flange portion extends obliquely outwardly and downwardly; and an annular sealing surface approximately at the same level as the connection of the cover portion to the shirt portion and below a connection of the flange portion to the cover portion, a height of the sealing surface being adapted to be larger than the thickness of the sheet, an outer diameter of the sealing surface being adapted to be slightly larger than the diameter of the opening; wherein the cover portion and its connection to the shirt portion is formed such that the plug body can be urged into the opening by an axial pressure on the cover portion under temporary reduction of the outer diameter of the sealing surface; and wherein the connection of the flange portion to the cover portion, the connection of the shirt portion to the cover portion, and dimensioning of said portions are Such that an outward pivoting of the flange portion upon insertion of the plug body into the opening approximately into the plane of an associated side of the sheet exerts a radial expansion force and/or a pivoting force on the sealing surface so that the material of said body in an area of the sealing surface, on an opposite side of the sheet, is formed against said opposite side of the sheet. 2. The plug of claim 1, wherein the sealing surface is slightly conical with a taper towards the shirt portion. 3. The plug of claim 1, wherein an upper side of the flange portion is convex and a lower side of the flange portion is concave. 4. The plug of claim 1, wherein the connection of the flange portion to the cover portion is formed as an annular bead which is axially aligned to the shirt portion and surrounds the cover portion. 5. The plug of claim 1, wherein the cover portion has a trough-shaped depression which extends radially outwardly up to the shirt portion and has a deepest point in a central region of cover portion. 6. The plug of claim 1, wherein at the outer side of the shirt portion below the sealing surface a plurality of circumferentially spaced noses is formed which form shoulders facing the cover portion. 7. The plug of claim 1, wherein the plug body is made of plastic material of relatively high density. 8. The plug of claim 7, wherein said plastic material includes a basic/material selected from the group consisting of a thermoplastic elastomer, polypropylene and an ethylene propylene elastomer. 9. The plug of claim 8, wherein barium sulfate is mixed to the basic material. 10. The plug of claim 1, wherein the cover portion has a thickness of 3 mm or more. 11. The plug of claim 1, wherein said flange portion extends obliquely outwardly and downwardly to a level below a lower surface in a central region of the cover portion. 12. A plug for sealing an opening in a sheet, said plug comprising an integral body which includes: a cover portion formed without a through bore therethrough so as to form a sealing closure for the opening; an annular shirt portion connected to a lower portion of a periphery of said cover portion; and an annular flange portion connected to an upper portion of the periphery of said cover portion; wherein said flange portion extends obliquely, outwardly and downwardly from said upper portion, which is at a level above an upper surface of a central region of said cover portion, to a level below a lower surface of said central region; and an outer circumferential surface of said periphery defines a conical sealing surface between the upper and lower portions where said flange portion and said shirt portions are connected to said cover portion, respectively, said sealing surface being adapted to be pressed against a side of the sheet when said plug is being pushed into the opening from an opposite side of the sheet. 13. The plug of claim 12, wherein an entirety of said plug is made of the same material. 14. The plug of claim 12, wherein said shirt portion tapers toward a free end thereof and away from said cover portion, said shirt portion including an inner cylindrical surface and an outer conical surface that extends from the lower portion of said periphery of said cover portion to said free end. 15. The plug of claim 12, wherein said central region is contiguous to said periphery and has a substantially constant thickness. 16. The plug of claim 12, wherein the cover portion has a trough-shaped depression in the central region, said depression extending radially outwardly up to the upper portion of said periphery and having a deepest point at the center of said cover portion. 17. The plug of claim 12, wherein said sealing surface is a conical surface converging in a direction from the upper portion to the lower portion. 18. In combination, a sheet having an opening and a plug for sealing said opening in said sheet, said plug comprising an integral body which includes: a cover portion formed without a through bore therethrough so as to form a sealing closure for said opening; an annular shirt portion connected to a lower portion of a periphery of said cover portion; and an annular flange portion connected to an upper portion of the periphery of said cover portion; wherein before said plug is pushed into said opening, said flange portion extends obliquely, outwardly and downwardly from said upper portion, which is at a level above an upper surface of a central region of said cover portion, to a level below a lower surface of said central region; and an outer circumferential surface of said periphery defines a sealing surface between the upper and lower portions where said flange portion and said shirt portions are connected to said cover portion, respectively, wherein said sealing surface is pressed against a lower side of said sheet when said plug is being pushed into said opening from an upper side of said sheet. 19. The combination of claim 18, wherein an entirety of said plug is made of the same material. 20. The combination of claim 18, wherein the cover portion has a trough-shaped depression in the central region, said depression extending radially outwardly up to the upper portion of said periphery and having a deepest point at the center of said cover portion. 21. The combination of claim 18, wherein said shirt portion includes, on an outer side thereof and below said sealing surface, a plurality of circumferentially spaced projections which form shoulders facing upwardly, said projections do not engage said lower side of said sheet after said plug has been completely pushed into said opening.