Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1994-12-27
1996-10-22
Cummings, Scott W.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
285230, 285231, F16J 1510
Patent
active
055669557
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a seal between two telescopically insertable concrete components, particularly tubes, wherein each concrete component comprises a bell-shaped socket having axially and radially extending inner surfaces, and a spigot end which, together with an inserted gasket, fit into one another and wherein the gasket is fixed to the socket by anchoring means.
Seals of this kind are known in numerous embodiments (see German patents nos. 2,140,546, 2,252,089, 2,935,392, 3,100,192, 3,232,823, 3,345,569, 3,507,909 and 4,104,851). With these seals, the gasket is bonded and integrated in the socket when the concrete component is being produced. For forming the socket, a forming tool, the so-called mold bushing, is used in which a form ring, for example made of foamed polystyrene, is inserted so as to correctly position and hold the gasket when the concrete component is molded. Late on, the form ring is removed. It is known to dispense with the removable form ring at a seal of the kind referred-to above (see German patents nos. 3,345,569, 3,507,909 and 4,108,851). In this case, a lot of expensive elastomeric material is needed to realize the seal.
It is an object of the invention to provide a seal of the kind referred-to above which can be produced more economically than prior art devices.
The solution to this problem is based on the fact that the gasket has a sealing area of a relative solid elastomer material and an extension which covers an annular space to take up a compressible light material body and lines the axially extending inner surface of the socket at its transition to the radially extending inner surface thereof.
This seal device can be produced with lower costs compared to a seal having a removable form ring, since no such form ring has to be removed. Compared to a seal without form ring, the seal of the invention has the advantage that elastomer material is saved, since such elastomer material is only used for the sealing area leaving out the thin extension covering the light material body.
Further embodiments and developments of the invention are characterized in dependent claims.
Embodiments of the invention are described in the following description taken in connection with the accompanying drawings.
FIG. 1 is a sectional view through the rim portion of a socket when being produced showing a first embodiment of a gasket.
FIG. 2 is a sectional view through a second embodiment of the gasket, and
FIG. 3 shows the seal in operation.
FIG. 1 shows how to produce a conrete tube using a mold 30 which comprises an outer sleeve 31, an inner sleeve 32 and an annular mold bushing 33 on the underside. There is shown only a portion of the bell-shaped socket 1, the mold extends essentially higher and is to be supplemented to the right hand side, the spigot end 2 being formed at the upper end. Integrated in the socket 1 is a gasket 3 which is anchored in the concrete of the socket by feet or flanges 4 and teeth or serrations 5. The gasket 3 includes a solid elastomer body 6 and a thin lug-like extension 7 which covers the axial extending inner side of the socket 8 and a portion of the radially extending inner side 9 thereof. A T-shaped head 10 is formed at the extension 7, the portions 6, 7 and 10 of the gasket defining an annular space 11 wherein a compressible light material body 12 is provided. Hooks or teeth 13 on the extension 7 provide for holding the light material body 12 within the annular space 11. The elastomer body 6 comprises a flap 14 which is directed to the annular space 11 so as to form axial grooves 15 and 16 opening into the annular space 11. Furthermore, a step 17 is provided between annular space 11 and elastomer body 6.
The light material body 12 consists of a compressible material as is foamed polystyrene which however should have sufficient stability so as to support without collabating the pressures occuring when the concrete components are formed. As shown, the polystyrene is a cylindric ring having a rectangular cross section, and such rings can be easily produced. For ex
REFERENCES:
patent: 3493237 (1970-02-01), Kleindienst
patent: 3915460 (1975-10-01), Kramer
patent: 4842240 (1989-06-01), Pickett
Cummings Scott W.
Forsheda-Stefa GmbH
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