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Individual
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Individual
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Priority to ES0054551UpriorityCriticalpatent/ES54551Y/en
Publication of ES54551UpublicationCriticalpatent/ES54551U/en
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Publication of ES54551YpublicationCriticalpatent/ES54551Y/en
230000014759maintenance of locationEffects0.000abstract1
238000012856packingMethods0.000abstract1
Landscapes
Earth Drilling
(AREA)
Abstract
STEP KEY PERFECTED, characterized essentially by the fact that the joining area of the tube in which it is installed with the upper coupling extension of the rod, also tubular, has an internal rim around the hole for passage of the rod, over which flange and fitted to the tubular extension rests an internally threaded washer that does the job of auger for the sliding of the repeated shank; two more are provided on said washer, with a central hole of greater diameter than that of those, which retain the packing, and, on these, a fourth washer fitted to the upper part of the shank and threaded to the inner edge of the upper extension, which ensures the firm retention of the whole. (Machine-translation by Google Translate, not legally binding)