Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1981-12-02
1983-08-16
Smith, Robert I.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277226, F16J 1500, F16L 2108
Patent
active
043987320
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a sealing ring of an elastic material, intended to be applied to the spigot end of a pipe under expansion of the ring diameter and subsequent insertion into a pipe socket of an adjoining pipe, said sealing ring consisting of a ring-shaped hose in whose cavity there is provided a solid compression member which is connected to the hose.
Ever greater demands are being made on this type of sealing rings, partly in relation to the effective seal and partly in relation to the load on the elastic material; for such a seal to have a satisfactory durability it must be completely certain that the material is not overloaded even under extreme conditions, e.g. in case of oblique loads or when the pipe sections are assembled.
The object of the present invention is to provide an embodiment of such a sealing ring which meets the most stringent demands in respect of these quality requirements and also facilitates correct fitting of the sealing ring.
The invention also aims at avoiding the tendency of inadvertent twisting of the sealing ring which causes great inconvenience when the ring is applied and when the pipe sections are assembled, as is the case with already known sealing rings of the present type.
This is achieved according to the invention in that the compression member is connected to the hose through a flap which is short in cross-section so that the compression member is disposed as excentrically as possible with respect to the hose which has a thin collapsible wall, said flap having an elongation that extends beyond the hose.
The advantage of such an embodiment of the sealing ring is in the first place that the sealing ring can in a specific and correct manner be pulled on to the spigot end of a pipe under expansion of the sealing ring itself. Thus, it is unmistakable how the sealing is to be used, and twisting of the ring is avoided with great certainty because the said elongation serves as a finger grip for the application of the sealing ring to the spigot end of a pipe and also counteracts any tendency of the ring being twisted when a pipe socket is slid over the sealing ring. Moreover, when the pipe socket is slid over the sealing ring, the hose rolls across the compression member and thus forms a double layer which provides for suitable resiliency in relation to radial and particularly axial displacements of the two pipe sections, simultaneously with the compression member, totally surrounded by the hose, giving a very safe seal without any risk of overloading of the material; of course the dimensions of the pipe socket and the spigot end have to be adapted so as to provide for a clamping force of a desired order.
As the hose is usually made quite open, it is moreover expedient according to the invention that the hose has been collapsed, e.g. by exhaustion, from its original, substantially circular cross-section so as to substantially tightly surround the solid compression member, the advantage being that there will be no compression of air within the hose which might result in an uncertain load and a risk of deterioration of the sealing effect after an extended period of time.
It is also expedient according to the invention that the outer edge of the said elongation serving as a finger grip is provided with a bead-like thickened area, which makes the finger grip itself more effective and also provides for a significant improvement in the counteraction against twisting of the ring when the pipe socket is slid over the ring.
A particular embodiment of the sealing ring of the invention is characterized in that said bead-like thickened area has substantially the same thickness as the compression member, said elongation of the short flap connected to the compression member having approximately the same length as the flap itself. In such an embodiment the said bead-like thickened area serves as a supplementary solid compression member which additionally improves the efficiency of the sealing ring as regards twisting during assembling operations and tightness in respect of assembled p
REFERENCES:
patent: 2705655 (1953-04-01), Brown et al.
patent: 3040393 (1962-06-01), Dailey
patent: 3058752 (1962-10-01), Miller
patent: 3413406 (1968-11-01), Plummer
patent: 3498623 (1970-03-01), Rowe
patent: 3891224 (1975-06-01), Ditcher
patent: 4170365 (1979-10-01), Haaland
Schionning & Arve' A/S
Smith Robert I.
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