Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1986-03-11
1987-09-01
Ward, Robert S.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
285110, 285230, 285345, 277152, 277205, F16J 1532
Patent
active
046904140
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a type of gasket which is adapted for sealing the gap between two approximately parallel sealing surfaces for example, a pipe and associated socket, which, during the assembly, are displaced axially relative to each other such that the gasket is compressed therebetween. The invention also relates to a method for manufacturing pipes in which the gasket is included as a part thereof.
There are great number of known types of gaskets which are to be used for the above purpose in which the gasket profile substantially consists of two main parts which are tied together through a connection piece of narrower width.
The first main body of the gasket profile can be designated "the attachment part" and is mounted undisplaceably on the one sealing surface. The other main body which can be designated "the sliding part", is disposed outside the first and is provided with more or less marked sealing lips which point in both directions relative to the axis of the gasket.
The distance between the main bodies of the gasket is smallest at the insertion side of the gasket. The purpose is that the gasket will have such a large opening that a pipe can be pushed thereinto, whereafter the pipe will abut against the concave surface of the sliding part, and because this is connected to the first stationary attachment part with the thin intermediate piece, the sliding part will pivot about the intermediate piece so that both sides of the concave sliding surface with the sealing lips will abut against the pipe pushed thereinto, and sealing is thereby established in both directions. Among other known gaskets having aproximately similar function are those mentioned in Norwegian Patent Specification No. 137400, U.S. Pat. Nos. 2,809,853 and 3,158,376, and British Patent Specification No. 154,409.
Gaskets in accordance with the above-mentioned patent specifications and also others of the same group, function largely satisfactorily if the gasket is in some manner, very securely attached to one of the sealing surfaces, for example, by having an especially broad abutment surface or by mounting the gasket in a relatively deep groove adapted therefor. If the attachment does not function satisfactorily, the gasket profile will, even if it is supplied with a lubricant on the surface, due to the friction existing between the pipe and the gasket, still be apt to pivot about its own axis such that the assembly becomes unsuccessful. Attempts to counteract this effect by connecting the gasket parts more or less offset relative to the axis of the gasket or the profile have not been satisfactory in this respect.
However, experiments have shown that this problem can be solved in a satisfactory manner, and this invention which in the following is to be further described with reference to the drawings, is intended to provide a gasket profile in which the above-mentioned disadvantages are eliminated through engaged in the sealing efficiency.
In the drawings,
FIG. 1 is a cross-sectional view of one embodiment of a gasket according to the invention,
FIGS. 2-4 are cross-sectional views illustrating the assembly of the gasket of FIG. 1 between two pipes,
FIG. 5 is a cross-sectional view of a mandrel on which the gasket of the invention may be manufactured,
FIGS. 6a and 6b are cross-sectional views illustrating a mode of assembly between two pipes for another embodiment of the gasket,
FIGS. 7a and 7b are cross-sectional views of mandrel used for constructing the gasket shown in FIGS. 6a and 6b, and
FIGS. 6-10 are cross-sectional views showing the assembly of another embodiment of the gasket according to the invention.
Turning now to FIG. 1 which is a section through a first embodiment of the gasket profile, the gasket is constructed from three main elements, attachment part 1, sliding part 2 and inclined connection part 3 therebetween.
An attachment part 1 can have a special shape, so that it matches a groove or similar, adapted thereto, but generally it will have a width which is substantially greater than its height and it wi
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Mehren Rubber A/S
Ward Robert S.
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