Seal for a joint or juncture – Seal between fixed parts or static contact against... – Contact seal for a pipe – conduit – or cable
Reexamination Certificate
1998-04-30
2001-02-27
Knight, Anthony (Department: 3626)
Seal for a joint or juncture
Seal between fixed parts or static contact against...
Contact seal for a pipe, conduit, or cable
C277S614000, C277S616000, C277S617000
Reexamination Certificate
active
06193238
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a sealing device comprising two substantially conical or cylindrical sealing surfaces which are axially introducable one into the other to a substantially concentric sealing position in which the sealing surfaces define between themselves an annular sealing space and further comprising a sealing element consisting of elastic material, which is compressed in the sealing space between the sealing surfaces.
Sealing devices of this kind are used for sealing piped-shaped elements in relation to each other, for example for sealing a socket and a spigot end of two pipes connected with each other. It is thereby desirable that the pipe joint shall be simple to mount and that the sealing device shall have sealing position which is well defined. Thus, it is desirable that the sealing element and the sealing surfaces shall cooperate in such a way that the sealing device provides for a resistance against axial displacement of the sealing surfaces from the sealing position. This kind of cooperation between the sealing element and the sealing surfaces provides also that the sealing surfaces are in the final stage of the jointing operation drawn against the sealing position which provides that the correct sealing position is automatically provided. A sealing device providing the resistance against axial displacement of the sealing surfaces from the sealing position as described above and also providing for an axial force striving to displace the sealing surfaces towards the correct sealing position is previously known from for example the Swedish Patent Specification No. 192 569. The sealing device according to this patent specification comprises a sealing ring positioned between the two axially jointable sealing surfaces, the sealing ring rolling between the sealing surfaces when the sealing surfaces are introduced one into the other and being provided with a peripherally extending, pointed projection which provides for an axial fixation of the sealing surfaces in a predetermined sealing position by the fact that the sealing ring has a greater compression resistance in the diametrical plane of the section of the sealing ring in which the projection is positioned. Even if the sealing device according to the Swedish Patent No. 192 569 presents a good function with regard to the capacity of locking the sealing surfaces in relation to each other in the axial direction and to draw the sealing surfaces into the desired sealing position at the final stage of the axial jointing of the sealing surfaces, the device according to said Swedish patent specification has substantial drawbacks. Thus, there is during the course of the jointing operation required an extremely accurate guiding of the two elements on which the sealing surfaces are provided and there is also required a careful cleaning of the sealing surfaces prior to the establishment of the pipe joint.
Also other sealing devices having the capacity of locking the sealing surfaces in the sealing position are previously known but also these prior art sealing devices present drawbacks with regard to their function, high costs and so on.
The object of the invention is to provide a sealing device of the kind discussed above which provides for a good sealing action, a reliable locking of the sealing surfaces in relation to each other, low costs and simple measurements with regard to the jointing operation.
BRIEF SUMMARY OF THE INVENTION
In order to comply with this object the sealing device according to the invention comprises a sealing element compressed in the sealing space between the sealing surfaces and consisting of elastic material ie. a material capable of regaining its shape after a compression load is removed, the sealing element being at least in the axial direction connected with one of the sealing surfaces, the sealing device being characterized in that the second sealing surface is formed with at least one projection and that the sealing element constitutes together with said first sealing surface at least one pair of portions positioned adjacent each other in the axial direction and having different compression resistances under the influence of the projection of the second sealing surface, the projection cooperating in the sealing position with the portion of said pair of portions of the sealing element presenting the lowest compression resistance and the portion of the sealing element having the greatest compression resistance being positioned in front of the portion having the lower compression resistance in the direction of introduction of the sealing surfaces one into the other so that the projection and the sealing element provide by means of their cooperation a resistance against axial displacement of the sealing surfaces from the sealing position.
Preferably the projection is formed as a peripherally extending bead which in axial section has the shape of a half point of an arrow.
In an embodiment of the sealing device according to the invention said first sealing surface is formed with at least one recess which for example can have the form of a peripherally extending groove, the sealing element extending above the recess as well as in front of the recess in the direction of introduction of the sealing surfaces one into the other, the portion of the sealing device positioned above the recess forming the portion of said pair of portions of the sealing element, which constitutes the portion with the lowest compression resistance, said projection engaging the portion of the sealing element which is positioned above the recess.
It is possible also to provide the sealing element with a portion projecting in a direction from said first sealing surface, said portion thereby constituting the portion of the sealing element which presents the greatest compression resistance, the projection of the other sealing surface engaging a portion which in the direction of introduction is positioned behind the projecting portion of the sealing element, said first mentioned portion constituting the portion of the sealing element having the smallest compression resistance.
The sealing device can include one or more, for example two or three, pairs of such portions positioned axially adjacent each other and constituting different compression resistances.
The sealing device according to the invention can with advantage be used for connecting non-socket concrete pipes by the fact that the concrete pipes are formed with spigot ends which are connected with each other by means of a separate socket consisting of plastic material. Thus, there is in this case used two sealing devices according to the invention by the fact that each spigot end of the pipes is connected with the separate socket by means of a sealing device according to the invention. In this case the socket can be designed so that it can be arranged so that the ends of the socket can be arranged in an angular position in relation to each other providing that the pipes connected with each other by means of the socket can be arranged in angular position. When using the sealing device according to the invention as described above for connecting non-socket concrete pipes with each other it is suitable that the socket and the pipes have axially outside the sealing devices the same inner diameters and the same outer diameters so that the pipes and the sealing devices form a continuous surface.
REFERENCES:
patent: 856106 (1907-06-01), Snow
patent: 1153002 (1915-09-01), Wright
patent: 1982044 (1934-11-01), Clark
patent: 2032576 (1936-03-01), Hering
patent: 2229587 (1941-01-01), Parker
patent: 2966539 (1960-12-01), Sears et al.
patent: 3129961 (1964-04-01), Danko et al.
patent: 3272538 (1966-09-01), Bergstrom
patent: 3396974 (1968-08-01), Nord
patent: 3515396 (1970-06-01), MacVaugh
patent: 3858912 (1975-01-01), Bower
patent: 4182519 (1980-01-01), Wilson
patent: 4496176 (1985-01-01), Weinhold
Baker & Daniels
Forsheda AB
Knight Anthony
Patel Vishal
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