Cameron Iron Works, Inc.

Irwin Rosenhauch

Fern H Cox

A wellhead shearing apparatus suitable for use on oil and gas wells having hydrogen sulfide. The apparatus includes a body with a vertical bore and opposed guideways extending from the bore. A ram assembly with two rams, means for moving each ram in the guideways together with the bore for shearing pipe in the bore and apart for other well operations. One ram has an upper cutting blade and the other ram has a lower cutting blade, which has a hard metal insert providing its cutting edge and the upper cutting blade has a hard cutting edge. The rams are of steel having a maximum hardness of 24 to 26 Rockwell C and the insert has substantially greater hardness. The hard cutting edges of both blades are isolated from the sour gas when the blades are under stress as a result of sealing across the vertical bore.

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Rockwall, TX, United States of America

Irwin Rosenhauch