Ruth was born in
Ercildoun, Pennsylvania, United States, to Samuel and Louisa Ruth (née Pinn). His father was born into slavery on the South Carolina plantation of Robert Frederick Ruth. Liberated as a teenager when the
54th Massachusetts Infantry Regiment occupied nearby city of
Savannah, Georgia, Samuel worked as a regimental water carrier and then as body servant to Lt.
Stephen Atkins Swails. After the war, Samuel accompanied two of his Union Army comrades to Pennsylvania, where he married the sister, Maria "Louisa" Pinn, of one of the men. Samuel's father-in-law was
Robert A. Pinn, a respected African American minister, attorney, and
Medal of Honor recipient. Samuel and Louisa worked for wages and saved enough money to buy a farm outside Ercildoun, where they raised crops and ten children, including William Chester. As a child, Chester proved insatiably curious about machinery, dissembling and reconstructing machinery around the family farm and thereby incurring his father's ire. He trained as a blacksmith from age 12, later expressing that his greatest regret was never receiving an education past the eighth grade. In 1917, he moved to nearby
Gap in
Pennsylvania Dutch Country. In 1922, he established a blacksmith shop, Ruth's Ironworks Shop, on
U.S. Route 30 in Gap. He shoed horses and repaired farm machinery for the region's predominantly
Amish and
Mennonite farmers. He tinkered with agricultural equipment based on feedback from customers and soon began designing his own devices to improve mechanical performance. == Inventions ==