A device (1) for passing through pipes in the form of a pig (1) moving through the pipe and guided on the inner wall thereof has at least one pig body (16) and support elements (8a) on the outer periphery thereof for guidance within the pipe as well as drive elements (10a, 10b) in the form of collars for transport in the pipe. The device is distinguished by improved entrance into the pipe conduit in that at least one of the collars (10a, 10b) can be radially expanded.
https://app.acclaimip.com/pdf/uTsuhbsLpSd4Oy7gXgulKxMEI3R0owfLe8tXZ7g/US6339993B1
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