Patent ID: 7681870

Claim:
A pipe clamp fixture comprising: a stationary head affixable to a pipe, said stationary head comprising a clamping jaw for clamping a workpiece different from said pipe and having a first mounting hole for accepting a first diameter pipe and a second mounting hole of a different diameter than the first mounting hole for accepting a second diameter pipe wherein said second hole is linearly aligned with said first hole; and a movable head lockable in place on the pipe by means of a locking device, said movable head comprising a clamping jaw for clamping the workpiece and a mounting aperture whose diameter is controlled by a diameter selection lever so that the mounting aperture selectively accepts both the first and second diameter pipes, wherein said diameter selection lever moves a shutter, wherein in a first position of said diameter selection lever said mounting aperture is relatively large and said shutter does not substantially protrude into said mounting aperture, and in a second position of said diameter selection lever said mounting aperture is relatively small and said shutter protrudes into said mounting aperture, and wherein a cross section of said shutter perpendicular to a longitudinal axis of said pipe has a curved crescent shape.