Rear stepper assembly for a pipe handling vehicle

Details Rear stepper assembly for a pipe handling vehicle Rear stepper assembly for a pipe handling vehicle

1976-11-08

1978-01-17

Werner, Frank E.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

180 8R, B66C 2342

Patent

active

040687643

ABSTRACT:
A pipe transporting vehicle steps into a pipe, passes through the pipe, and exits at the opposite end to bring into the inside of the pipe a pipe carriage. The vehicle has a stepper assembly of a stanchion, a walking beam pivotally connected to the stanchion, an axle set at each end of the walking beam, and a support structure in telescopic receipt of the stanchion. Trunnions and gudgeons between the beam and axle sets permit oscillation of each axle set about a fore-and-aft axis of the stepper independently of the other to accommodate irregularities in the path of the vehicle transverse to the line of vehicle movement. The walking beam pivots through a large angle for the stepping function of the wheels and to accommodate irregularities in line of motion of the wheels. A sleeve of the support structure telescopically receives the stanchion. Vertical loads from the carriage of the vehicle and pipe are taken by the sleeve and transferred to the stanchion through elastomeric shock absorbers. Top and bottom vertical slide bearings between the stanchion and the sleeve take moments, torques and horizontal forces between the two and permit relative vertical motion between the two. A fore-and-aft, individually actuatable, push-pull hydraulic cylinder operates on each axle set to lift it individually to step into and out of a pipe.

REFERENCES:
patent: 2954136 (1960-09-01), Butler et al.
patent: 3258135 (1966-06-01), Bigge et al.

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