| 摘要 |
The coupling device applicable particularly to bore-hole filters composed of a pipe connector inside of which a coupling sleeve with a spline is set. The spline functions together with a spline of a slidable ring. The device is distinctive in that the coupling sleeve (3) is linked with the bell connector (6) having a pre-formed track where bearing balls (5) move enclosed within a bearing ring (7), while there is some free space (2a) on one side of the pipe connector (2) corresponding in length to the slidable ring (4).<IMAGE>
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