Flexible drill shaft
OwnerJose Teixeira, Dominique Sabinainventors
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Abstract
A method of making a flexible drill shaft. The method comprising: winding wire to form a helical coil spring, applying a mechanical deformation to the wire as it is being wound and using the helical coil spring to form a flexible drill shaft. The mechanical deformation applied results in the wire after being wound having a cross section such that when an axial load is applied to the drill shaft there is planar contact between adjacent coils of the spring.
Claims3
A method of making a flexible drill shaft, the method comprising:
- winding wire to form a helical coil spring;
- applying a mechanical deformation to the wire as it is being wound;
- and
- using the helical coil spring to form a flexible drill shaft;
- wherein the mechanical deformation applied results in the wire after being wound having a cross section such that when an axial load is applied to the drill shaft there is planar contact between adjacent coils of the spring.
A method of making a flexible drill shaft according to claim 9 comprising:
- applying a preload as the wire is being wound.
A method according to claim 9 or 10 comprising using dimensional or thermal expansion to tightly assemble two or more coil springs.
Dependencies are inferred from the claim text.