Patent ID: 11970914
Assignee: PETROMAC IP LIMITED
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A device for transporting a tool string down a bore, the device comprising:
a mandrel formed as a single unitary part comprising a connection at each end of the mandrel for in-line connection to an adjacent component of a tool string;
an annular body formed as a single unitary part, the annular body rotationally mounted to the mandrel to rotate relative to the mandrel about a longitudinal axis of the mandrel or tool string,
a pair of wheels rotationally mounted to the annular body to rotate relative to the mandrel on a rotational axis perpendicular to the longitudinal axis of the tool string,
a collar releasably coupled to the mandrel,
wherein the annular body is received on the mandrel between the collar and an axial shoulder on the mandrel, and
at least one dog received in a groove in the mandrel, wherein a face of the dog bears against a side of the groove and an opposing face of the dog bears against an internal axial facing surface of the collar to axially engage the collar against the mandrel in an axial direction towards the annular body to transmit an axial force applied to the collar to the mandrel.