| 摘要 |
Suspended from a carriage that straddles a standing seam, in which the upper portions of adjoining upright flanges are interlocked, is a vise having a pair of normally spaced jaws with a short length of the standing seam between them. One of the jaws is rigidly connected to the carriage, but the other jaw can be moved toward and away from the first jaw by a fluid pressure cylinder supported by the carriage. The movable jaw is moved toward the other jaw periodically to compress and close the interlocked upper portions of the seam. Each time the jaws are separated the carriage can be moved along the seam in order to close an adjoining length of the seam. Preferably, the carriage is moved along the seam automatically by means of motor-driven rollers that frictionally engage the standing seam. The rollers are rotated to move the carriage only while the vise is released from the seam.
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