초록 ▼

Opposed rams are sealably and reciprocally mounted in a body with opposed shear blades projecting from one end of each ram for movement toward each other to sever an elongated object extending between the rams and blades. A seal is provided on each blade and configured to sealingly receive therein t

Opposed rams are sealably and reciprocally mounted in a body with opposed shear blades projecting from one end of each ram for movement toward each other to sever an elongated object extending between the rams and blades. A seal is provided on each blade and configured to sealingly receive therein the exposed portion of the opposed blade after the object has been severed, and each ram is provided with a cut out portion to receive the adjacent severed end of the elongated object to inhibit crushing thereof.

대표청구항 ▼

In a blowout preventer having a pipe passage with guideways extending laterally from opposite sides of the pipe passage, rams mounted in the guideways with opposed shear blades extending from the rams for movement between a spaced apart position to receive pipe in the pipe passage to an engaged posi

In a blowout preventer having a pipe passage with guideways extending laterally from opposite sides of the pipe passage, rams mounted in the guideways with opposed shear blades extending from the rams for movement between a spaced apart position to receive pipe in the pipe passage to an engaged position for shearing the pipe without crushing it and for sealing off the pipe passage, each ram having a face with a central cutout portion for receiving the uncrushed sheared pipe, the improvement comprising: said opposed shear blades having generally flat upper and lower parallel surfaces with front, back and longitudinal side surfaces extending between said upper and lower parallel surfaces, said front surface forming a shear surface on said opposed shear blades; said shear surface on each of said opposed shear blades including guide surfaces extending toward said back surface and coverging inwardly from said side surfaces, said guide surfaces terminating at their inner ends in an arcuate portion and said arcuate portion having an annular tapered cutting surface that extends on a diagonal plane between said upper and lower surfaces; and seal means on said opposed shear blades shaped to telescopically receive and sealingly engage said side and shear surfaces of said opposed blades when the rams are engaged to seal off the pipe passage when the pipe has been sheared.