Abstract: An unmanned chain hook-up or hoist for lifting loose bundles of pipe or other materials. A hoist is hooked so as to lift a framework along the channels of which a novel link chain is driven so as to move underneath the load to be lifted and locked to the framework. The novel chain includes, in each link, a stop to prevent the chain from turning in one direction while not interfering with the turning movement in an opposite direction, the latter permitting the chain to be retracted into the guiding channels of the framework. The chain or a modification is also applicable to a lift truck.

Abstract: A method for making seamless pipe from molten premium steel which is cast by a centrifugal process into hollow billets. The billets are then outer diameter turned, cut to length, and bored. By such centrifugal casting followed by machining, the inner diameter is formed in the billet without a piercing operation. The turning and boring also remove normal impurities in the billet. The billet is then heated and hot extruded in reduction ratios of high magnitude, from about 5 to 1 up to about 60 to 1 for converting large grain castings into fine grain size forgings or cold worked material.