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A shearing apparatus for installation on a wellhead and having capability of shearing drill collars. The improved apparatus includes a body with a vertical bore therethrough and ram guideways extending laterally from opposite sides of the bore, a pair of rams, each positioned in one of the guideways

A shearing apparatus for installation on a wellhead and having capability of shearing drill collars. The improved apparatus includes a body with a vertical bore therethrough and ram guideways extending laterally from opposite sides of the bore, a pair of rams, each positioned in one of the guideways, each ram including a cutting blade, reciprocating means secured to each ram for moving the rams and their cutting blades into the vertical bore to shear tubular members therein and to retract the rams and cutting blades into the guideways, the reciprocating means having sufficient power to cause the cutting blades to shear large diameter casing and drill collars, and arms secured to the sides of the rams and extending toward the other ram, said arms engaging as the rams are moved toward the bore and providing a force resisting the forces tending to vertically separate the cutting blades during shearing, said arms also substantially filling the space of the guideways outside the vertical bore to prevent the forcing of members being sheared into this space.

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A ram-type shearing apparatus for a wellhead comprising a body having a bore therethrough and ram guideways extending laterally from opposite sides of the bore, a ram assembly comprising first and second rams, each located in one of the ram guideways, and means for reciprocating the rams into and fr

A ram-type shearing apparatus for a wellhead comprising a body having a bore therethrough and ram guideways extending laterally from opposite sides of the bore, a ram assembly comprising first and second rams, each located in one of the ram guideways, and means for reciprocating the rams into and from the bore, each ram having a cutting blade in position for the cutting edge of the blade on one ram to pass just below the cutting edge of the blade on the other to shear an object positioned in the bore when the rams are moved together into the bore, and each ram having an arm secured to its side and extending toward the other ram, one such arm overlapping its opposite arm to prevent vertical separation of the blades.