Junker & Ruh's 1877 patent

Junker & Ruh

Patented in the UK in 1877 by E.T Hughes, this German Junker & Ruh domestic lockstitch was subsequently marketed in Britain by George Whight and named "Columbia".
The novel chain drive arrangement was summarised as followed:-
"The chain pulley B2 on the flywheel B1 is cast with small projections or teeth, and the chain is placed on edge in a groove on the pulley B2 in order to facilitate placing it over the teeth. The chain also passes over pulley B3 on shaft B, and is tightened, when necessary, by an eccentric arrangement which moves the wheel B1 away from the shaft B. The chain is made of soft-iron wire with open links, which are locked and hardened when in position."

© All content copyright protected.