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

Claim 20:
21. A tubular drive assembly comprising:
an outer tube having a first longitudinal axis and one or more coupling members; and
an inner body having a second longitudinal axis and one or more coupling members, the inner body being arranged within the outer tube;
wherein the inner body and the outer tube have a mutual axial overlap;
wherein the coupling members of the outer tube and the inner body are mutually cooperating coupling members for providing mutual fixation in longitudinal direction;
wherein the outer tube and the inner body have rotational freedom with respect to each other over an angular rotational freedom range between a first extreme rotational position and a second extreme rotational position;
wherein at least one of the extreme rotational positions is an engagement position in which the outer tube and the inner body contact each other according to a plurality of at least three longitudinal, substantially line-shaped contact zones that extend axially over substantially the entire axial length of the overlap;
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
dis-engageable by mutual rotation of the outer tube and the inner body in a second direction opposite the first direction.