Jimmy Don White

US Patent:

39373827, Feb 10, 1976

Filed:

Jan 2, 1975

Appl. No.:

5/538089

Inventors:

Joseph A. Cunningham - Tulsa OK
Jimmy L. White - Broken Arrow OK

Assignee:

H. C. Price Co. - Bartlesville OK

International Classification:

B23K 3704

US Classification:

228 49

Abstract:

An internal pipe clamp is provided by the present invention. The clamp is designed to clamp two joints of pipe into position for a circumferential weld. The clamp includes mechanism for spacing the two joints apart a very short distance to facilitate welding. A backup member is provided which is movable from a retracted position. The backup member comprises two backup portions each of which comprises two pivotally coupled backup segments. Each segment extends through an arc of approximately 90. degree. and terminates in a wedge shaped end that is complemental to the wedge shaped end of an adjacent segment. Power cylinders move each segment from a retracted to an extended position. Power cylinders are also coupled in opposed relationship with each adjacent pair of wedge shaped ends to force same into tight contiguous relationship when the segments are extended.