American Hoist & Derrick Company

Alan A Meyman

Pierre Cornelius Delago

Frank M Monteiro

A self-erecting traveling crane having a machinery platform rotatably mounted with respect to a carbody utilizes a concentric support ring, a boom foot carrier pivotably mounted to the platform and rolling on the support ring, and a counterweight carrier with trailing counterweight pivotably mounted to the platform and rolling on the ring. A mast and boom are mounted near a forward end of the boom foot carrier. To change location for use, the crane can be rigged to move in forward or rearward direction carrying its support ring. A travel strut is pivotably mounted to an inner end of the boom foot carrier. A boom foot carrier tension pendant extends from the top of the travel strut to an outer end portion of the boom foot carrier. A live boom suspension linkage connects the points of the mast and the boom. Boom suspension pendants extend from the mast point to the trailing counterweight. A gantry is mounted on the machinery platform over a platform counterweight. A live boom foot carrier suspension linkage connects from the top of the gantry to the top of the travel strut. The live linkage of this boom foot carrier suspension linkage connects also to a mast suspension pendant which is connected to the mast point. This linkage is used to raise the mast and the travel strut before the live boom suspension linkage is used to raise the boom. The carriers are each provided with hooks to lift the support ring. To rig for travel, the boom is lowered to cause the counterweight carrier to lift the rear of the support ring off of the ground. The boom is then raised and the live linkage of the boom foot carrier is shortened causing the boom foot carrier tension pendant to raise the front end of the support ring off of the ground.

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Bloomington, MN, United States of America

Alan A Meyman