Patent ID: 11920411
Assignee: WEATHERFORD TECHNOLOGY HOLDINGS, LLC
Field: Mechanical elements (Mechanical engineering)
Classification: CPC E  F | IPC E  F

Claim 11:
12. A top drive system comprising:
a drive unit comprising:
a drive stem; and
first portions of a hydraulic coupling unit; and

a tool adapter comprising:
a tool stem; and
second portions of the hydraulic coupling unit,

wherein a plurality of sliding coupling members are disposed on one of the drive stem and the tool stem,
wherein a plurality of coupling recesses are disposed on the other of the drive stem and the tool stem,
wherein the hydraulic coupling unit generates a hydraulic impulse in response to coupling of the drive unit to the tool adapter,
wherein the hydraulic impulse causes the sliding coupling members to move from a retracted position to an extended position, thereby engaging the coupling recesses and providing an axial load coupling between the drive stem and the tool stem; and
wherein the first portions of the hydraulic coupling unit comprise a plunger; and, the second portions of the hydraulic coupling unit comprise a cylinder, an upper reservoir, a middle reservoir, a lower reservoir, a valve between the upper reservoir and the middle reservoir, and a lower cylinder in the lower reservoir.