Railways – Tubular way – Internal service device
Patent
1991-03-26
1992-12-22
Oberleitner, Robert J.
Railways
Tubular way
Internal service device
B61B 1310
Patent
active
051726394
ABSTRACT:
A cornering pipe traveler includes a tractor having a pair of carriages, a leading carriage and a trailing carriage, each carriage including a clamping device for positively engaging the inner surface of the pipe, and structure for propelling the carriage along the pipe; interconnected between the pair of carriages there is a device for exerting a curling force between the two carriages for mechanically compelling the lead carriage to curl and enter a turn in the pipe; also included is structure for aligning the lead carriage so that the curling force compels the pipe traveler to enter a selected turn to be made.
REFERENCES:
patent: 2838009 (1958-06-01), Bonanno
patent: 4526106 (1985-07-01), Okada et al.
patent: 4722001 (1988-01-01), Rohrich et al.
patent: 4862808 (1989-09-01), Hedgcoxe et al.
patent: 5018451 (1991-05-01), Hapstack
Fischer Edward E.
Fontana Richard R.
Gamble Bruce B.
Hsiung Robert T.
Kozminski Steven J.
Gas Research Institute
Le Mark T.
Oberleitner Robert J.
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