The hand crank is straightforward in concept, but key to usability was selecting a DC gearmotor with a gear ratio that made cranking by hand both comfortable and sustainable; too weak of a crank ...

It is easy to use a small dc motor as the “dynamo” of a hand crank generator, but mechanical construction of the associated “gear-train” unit is an awkward task. That is why an easy method is used ...

The hand crank is straightforward in concept, but key to usability was selecting a DC gearmotor with a gear ratio that made cranking by hand both comfortable and sustainable; ...

Like all their accessories, this heirloom-quality Hand Forged Crank ($145) is manufactured in the company’s Portland, Ore., shop and made individually, relying on age-old forging techniques.

Turns Out, Hand-Crank Chargers Don't Have to Be Ugly It's an emergency gadget you wouldn't be embarrassed to keep on your desk. By Eleanor Hildebrandt Published: Nov 09, 2018 12:34 PM EST ...

Gear. Oct 25, 2012 1:40 PM. Hand Crank Is a Backup for Your Backup Battery. ... The BoostTurbine Series batteries come equipped with a hand crank that will let you generate power manually.