Patent ID: 9574599
Date: 2017-02-21
CPC Classifications: F01D,F02B,F05D,F16B,F16L,Y02T

Claim:
1. A sealing device comprising a plug intended to be placed in a threaded hole in a case, or removed therefrom, respectively by screwing and unscrewing, the plug comprising: a central body provided with a screw thread, a skirt rigidly connected to the central body and having a bearing zone capable of transmitting tightening thrust to the case, locking and unlocking means opposing spontaneous unscrewing of the plug, automatically activated by the rotation of the plug and its corresponding movement in the direction of screwing along a longitudinal axis, said locking and unlocking means comprising a first releasable coupling component coupled for common rotation with the central body and a second releasable coupling component captive on the central body and capable of immobilization against rotation with respect to the case during screwing, wherein the first coupling component is coupled for common rotation with the central body via guide means configured on the periphery of the first component and extending radially with respect to said longitudinal axis, said guide means entering respectively corresponding grooves configured inside the skirt, which extend along the longitudinal axis so as to allow axial displacement of the first component inside the skirt, wherein the skirt bears against the second releasable coupling component to transmit tightening thrust to the case.