Unit Rig & Equipment Co.

Robert M Fornell

Floyd E McCann

A method for mounting a large tire onto a single-piece rim comprising the steps of first securing the rim to a stand having an upwardly extending ram, positioning an oblique cone atop the rim with the ram extending through its center, the majority of the cone is open except for three spaced and sloped segments wherein one segment is more steeply sloped than the two remaining segments, placing the tire on the cone, positioning a presshead having a downwardly extending post and three radially spaced hydraulic cylinder arms above the stand wherein the arms are pivotally mounted on the presshead and extend downwardly therefrom, a first arm having a horizontally disposed foot mounted on its lower end is aligned with the steeper segment, the two remaining arms each having a foot are aligned with the remaining segments respectively, lowering the presshead thereby receiving the ram within the post and having the feet resting upon the upper sidewall of the tire, extending the first foot against a first portion of the sidewall causing a portion of the bottom bead to slip into the drop center of the rim, extending the two remaining feet against the remaining portions of the sidewall, alternating the downward pressure against the remaining portions of the sidewall thereby rocking the bottom bead into the drop center, and then repeating the sequential process of applying downward pressure against the sidewall thereby causing the upper bead to be slipped into the drop center thus completing the mounting of the tire.

Method and apparatus for mounting a giant tire

A vent accumulator for a hydraulic integrator of the type having at least three pistons arranged in end-to-end relationship within an elongated housing. Each piston is adapted to move under hydraulic pressure in a direction away from one longitudinal end of the housing towards the opposite longitudinal end. Each of the pistons, except for the last piston adjacent the opposite end of the housing, is provided with a piston rod operatively connected to the piston next adjacent towards one end of the housing. Each piston is defined as having a first side directed towards one end of the housing and a second side directed towards the opposite end of the housing. Each of the pistons, except for the last two pistons in line, is provided with means for receiving hydraulic fluid under pressure from a load cell on its first side and an air vent communicates on it second side. The next-to-last piston, adjacent the opposite end of the housing, has means for receiving hydraulic fluid under pressure on its firstside, with the other side of the next-to-last piston being mechanically connected to the last piston. The last piston exerts its pressure on a body of hydraulic fluid which is located on its second side, whereby the pressure on this body of fluid represents the total of the pressures exerted on the remaining pistons by the load cells which are connected thereto. An air vent communicates with the last piston on its first side. The improvement over the prior art is the vent accumulator which is formed by an elongated cylindrical hollow closed chamber and a conduit connecting each of the air vents of the hydraulic integrator to the vent accumulator.

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Tulsa, OK, United States of America

Robert M Fornell