| 摘要 |
In accordance with an illustrative embodiment of the present invention, a clamp assembly that is tightened around a pipe to handle the same includes linked, circumferentially spaced gripping members open on one side to provide a gate region, a pressure operated piston and cylinder assembly that cooperates with a latch to close and open the gate region, and line connections to apply selected pressures to the opposite sides of the piston. A low level pneumatic pressure is applied to the outer side of the piston at all times and tends to open the clamp, and a high level of pressure is selectively applied to the opposite side of the piston to close the gate region. As the high pressure is bled off, the low pressure level automatically opens the gate region.
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