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Not unlike this:
http://pardo.net/bike/pic/mobi/d.interdrive-crank/000.html?fbclid=IwAR3N8ndpox1I-cD7PbqkHvwrtHEiQ9kSUWs48MBPDvGIE5_UZX85fmbrv6wOr even this current design: https://www.ochain.bike/technical-support-page?fbclid=IwAR2sB_jgxgjjuSsXPpJM52GP7oERdPee46h9u7Kvb-vR4mx4v08CO8Ojjn4
The correct engineering term for all these type of cranks is, of course, “bollocks”.
jj72
I think the effect was to lengthen the effective crank arm length for the downstroke, providing more leverage/more power and shortening it for the upstroke.
Seems it was studied here and did show to improve maximum and average power for certain situations