| 摘要 |
An internal spacer and expander clamp for use when welding two sections of pipe (10, 10A) together. There are two spider rings (112, 112A) supported from a frame (104), one in one section of pipe and the other across the joint in the other pipe. Each spider ring has a plurality of holes (11) with a piston (16) with a pipe contacting pad (28) in each hole. A rotor (14) is supported within said spider ring. A linkage bar (18) is pivotally connected at one end to the piston and at the other end to a pin (22) in a cut-out (37) in the rotor. The convex ends (34) of the linkage bar mates with a concave cut-out (36) in the piston and the other end in a concave cut-out in the rotor. A power linkage rotates the rotor such that in a first position the longitudinal axis of the piston is out of alignment with the longitudinal axis of the linkage bar and in a second rotational position thus are aligned forcing the shoe (28) against the inner surface of the pipe with great force.
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