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My design Trifin is a universal concept for the handles of screwdrivers and other turnable tools.
Many weaker and older people do not have enough power in their hands to transmit the torsional moment needed to loosen a screw to a handle of a screw driver. Having enough power to transmit high moments, stronger people sometimes start cramping after working a longer time with a screw driver.
The universal solution called Trifin is a handle that
enables the user to transmit higher torsional moments using less power.
Trifin is manufactured as an injection moulded part with an inmoulded piece of steel.
Prof. Wolfgang Schabbach