Hobson's joint

A Hobson's joint or Hobson's coupling is a type of right-angle constant-velocity joint; rods bent 90° are able to transmit torque around a corner because they are all free to turn in their mounting holes in both legs of the coupling.[1][2]

An animation of a Hobson joint

Hobson's joints are used to make elbow engines, a novelty device,[1] but also for practical purposes in tools[3] and shaft-driven bicycle gearing.

External links

Hobson Joint on YouTube
Elbow engine on YouTube
One more Hobson's joint solution on YouTube

References

"Ten Cylinder "Elbow Engine". The Steam Gallery. Creative Edge Design of Greenville. Retrieved August 1, 2015.
dan (June 1, 2008). "When a universal joint is just too PRACTICAL". How to Spot a Psychopath. Retrieved August 1, 2015.
Benjamen Johnson (May 30, 2008). "Gearless Right-Angle Socket Adapter". Toolmonger. Retrieved August 1, 2015.

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[SteamGallery-1] "Ten Cylinder "Elbow Engine". The Steam Gallery. Creative Edge Design of Greenville. Retrieved August 1, 2015.

[dan-2] (June 1, 2008). "When a universal joint is just too PRACTICAL". How to Spot a Psychopath. Retrieved August 1, 2015.

[Toolmonger-3] Benjamen Johnson (May 30, 2008). "Gearless Right-Angle Socket Adapter". Toolmonger. Retrieved August 1, 2015.