| 摘要 |
Invention is directed to a circular coupling for joining a first tubular member to a second member, where the second member may be a tubular member larger than the first, or a manhole. Specifically, the first end of the coupling is adapted to encircle the first tubular member and a second end thereof is adapted to be received within a complementary opening in the second member. The coupling comprises an elongated open ended tubular joint member formed of a relatively rigid sheet-like member or members, where opposing sheet ends overlap such that the end portions lie contiguous with each other. Within the joint member is a continuous sleeve formed of an elastomeric material contiguous with the inner surface of the tubular joint member and extending from the first end toward and wrapped around the second end. The sleeve near said first end, further includes at least one continuous upstanding annular rib to be compressed about the tubular member, while near the other end at least one continuous upstanding external rib is provided to be compressed against the complementary opening of the second member. Finally, means are provided for changing the diameter of the tubular joint member, where the means includes a first member for incrementally decreasing the diameter of the first end to compress the coupling about the tubular member, and a second member for incrementally increasing the diameter of the second end to compress the coupling against the complementary opening of the second member.
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