Patent ID: 11970912
Assignee: nan
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 8:
9. The tubular drive assembly according to claim 1, wherein the outer tube and the inner body are provided with mutually cooperating coupling members for providing mutual fixation in longitudinal direction;
wherein the mutually cooperating coupling members comprise at least one boss and at least one corresponding recess or opening capable of receiving the boss;
wherein the at least one boss is selected from the group consisting of:
a first boss protruding inward from an inner surface of one of the side faces of the outer tube;
a second boss protruding outward from an outer surface of the inner body; and
a combination thereof;

wherein the at least one corresponding recess or opening is selected from the group consisting of:
a first recess or opening arranged at the outer surface of the inner body, each first recess or opening capable of receiving a first boss;
a second recess or opening arranged at the inner surface of one of the side faces of the outer tube, each second recess or opening capable of receiving a second boss; and
a combination thereof; and

wherein each boss and the corresponding recess or opening are arranged at or near the contact zones such that they are engageable by mutual rotation of the outer tube and the inner body in a first direction and are dis-engageable by mutual rotation of the outer tube and the inner body in a second direction opposite the first direction.