| 摘要 |
An automatically sequencing, hydraulically powered pre-entry pull-up tool for upsetting blind fastener sleeves on the blind side of a structure, and a novel sequencing method employed by said tool to assure complete and uniform fastener upsetting. The tool includes a hand gun having a protruding threaded mandrel insertable into a blind fastener sleeve to be upset, the mandrel rotating in one direction to engage with the sleeve, axially retracting to pull up and upset the sleeve, and then rotating in the opposite direction to disengage from the sleeve, these three steps being hydraulically powered in the hand gun by hydraulic power from a remote source, and being electrically controlled. According to the method of the disclosure uniform upsetting is assured by effecting the automatic shifting from stage to stage of the operation by sensing back pressure in the hydraulic system.
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