How does a mini drill flexible shank work?

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A mini drill flexible shank operates through a mechanism that includes an inner core made of flexible multi-strand wire cable, surrounded by a helical winding of steel wire. The design features a counter-wound helix that allows for torque transmission based on the direction of rotation, utilizing tension in one of the helical layers. The discussion also touches on the relevance of existing patents, noting that many pertain to surgical instruments rather than drill extenders. Participants express difficulty in locating specific patents related to moto-tool flexible shafts. The conversation highlights the unique engineering behind flexible shank technology and its applications.
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Help solve confusion on how the real mini drill flexible shank working mechanism
How is actually is a mini drill flexible shank working mechanism being able to deliver torque/energy/force so pliable ?
 
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There is an inner core made from flexible multi-strand wire cable.
Outside that is wound a helix of steel wire, and then a counter-wound helix of steel wire.
Depending on the direction of rotation, the torque is transmitted by tension in one of the helical layers.
 
berkeman said:
Which one of those patents apply to a drill extender? Most seem to be for surgical instruments...
I believed I had posted a link for a moto-tool flexible shaft instead.
Sorry, I can't find it again.
 

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