ORGANISATION FOR THE DISPOSAL OF UNDERWATER ROLLING DEVICES

摘要

Tong apparatus operated oleopneumatically for lifting a submerged pipeline either directly by a frogman or by an operator on a pontoon or vessel. The apparatus includes a pair of jaws controlled by a double acting cylinder with two pistons. The cylinder has a body pivotally connected to the upper end of one jaw and has an active chamber wherein a first piston with a wide cross-section slides, while a second piston having a small cross-section is pivotally connected to the upper end of the other jaw and slides coaxially as to the first piston in a second active chamber provided by the wide cross-section of the said first piston.