Method and apparatus for maintaining the axial alignment between

Details Method and apparatus for maintaining the axial alignment between Method and apparatus for maintaining the axial alignment between

1974-11-07

1976-05-18

Spar, Robert J.

Railways

Tubular way

Internal service device

B61B 1310

Patent

active

039569950

ABSTRACT:
To maintain centering of the axis of a machine movable along a tube and rotatable relative to the tube, the machine is associated with a weight compensating device which provides a weight compensation sufficient to compensate for the weight of the machine regardless of the attitude of the machine in the tube. The device comprises at least one closed chamber for liquid and communicating with at least three radially extending, equally angularly spaced cylinders and pistons, the pistons of which are fixed to the chamber and the cylinders of which carry rollers bearing against the wall of the tube.

REFERENCES:
patent: 3251136 (1966-05-01), Tyrrell et al.
patent: 3400574 (1968-09-01), Cramer
patent: 3598422 (1971-08-01), Strauff
patent: 3734428 (1973-05-01), Alexandrov et al.

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