Railways – Tubular way – Internal service device
Patent
1990-01-05
1991-05-28
Oberleitner, Robert J.
Railways
Tubular way
Internal service device
B61B 1310
Patent
active
050184512
ABSTRACT:
A pipe crawler having a front leg assembly and a back leg assembly connected together by two air cylinders, each leg assembly having four extendable legs and a pair of actuators for sliding the extendable legs radially outward to increase the range of the legs when the pipe crawler enters a section of a pipe having a larger diameter. The crawler crawls by "inchworm"-like motion, the front leg assembly and back leg assembly alternately engaging and disengaging the wall of the pipe to hold the pipe crawler as the air cylinders alternately advance the front leg assembly and bring up the rear leg assembly. The pair of actuators of each leg assembly are parallel, adjacent and opposing acting so that each slides two adjacent extendable legs radially outward.
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Dixon Harold M.
Hamel Stephen D.
Morano S. Joseph
Moser William R.
Oberleitner Robert J.
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