Patent ID: 11952850
Assignee: BOYLES BROS DIAMANTINA S.A.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 5:
6. An upper inner tube head assembly that is coupled to a lower inner tube head assembly through a coupling to form an axially movable inner tube assembly within a drilling pipe assembly of a system for the extraction of samples by means of a core barrel, comprising:
a main body on which a retractable body is slidably and concentrically mounted, a support component whose axial movement upwards is restricted by a main body seat and downwards by a lower body that is connected to the main body through a coupling area that cooperates with a lower body coupling area, so that the movement of the support component is restricted;
wherein at least one rapid lowering area is formed on the inner surface of the support component and the main body, said at least one rapid lowering area corresponding to a respective support component fluid passage channel for fluid flow externally to the main body; and
wherein the lower body has at least one lower body fluid passage channel corresponding to the at least one support component fluid passage channel.