Abstract: A telescoping boom assembly supported articulated well service pipeline for the transfer of pressurized fluids from service vehicles to petroleum wellheads for the treatment and stimulation of production oil wells. The boom assembly is mounted on a truck, trailer, or other suitable mobile transport, and the articulated pipeline comprises a pair of long straight end pipe sections interconnected by a plurality of shorter intermediate pipe sections and by swivel joints. The two end pipe sections are aligned generally parallel with the telescoping boom and the intermediate pipe sections flip-flop to change their direction of alignment as the pipeline is extended and retracted. The flip-flop feature provides a maximum change in length of the pipeline between the extended and the retracted positions with a minimum number of pipe swivel joints.

Abstract: A fire-safe seal for use in a swivel joint in a pressurized fluid system subject to fire risk, the seal having both a metal anti-extrusion ring and an annular resilient non-metallic seal member to provide essentially zero fluid linkage at normal operating temperatures, and the anti-extrusion ring to provide an extremely low rate of leakage in the event high temperature should destroy the resilient seal member. A curved spring or other metal anti-cocking device biases the anti-extrusion ring tightly against the junction of a male and a female joint to ensure that the ring remains in position after the resilient seal member is destroyed to prevent leakage through the junction.

Abstract: An article carrying cup transfers an article along a continuous conveyor from a load zone through a weighing zone to a discharge zone where the article is discharged into areas according to weight. The cup is pulled along by a transverse tow bar loosely pivoted to the cup. At the weighing zone the cup is supported front and rear by weighing pegs which ride on front and rear weigh bars to hold the cup in a horizontal position and with the center of gravity between the weighing pegs to insure accurate weighing of asymmetrical articles. The front and rear weigh bars are positioned so the front and rear pegs transfer onto the corresponding weigh bars at the same time, and transfer off the weigh bars at the same time to maximize the weighing time of a moving cup.