The Shaker tilting chair – named for its ball bearing or ball and socket button mechanism assembled to the back two legs of a wooden chair – allowed a person to lean back in the chair without slipping or scraping the floor. == Description == The device was a new practical way of being able to lean back without slipping while sitting in a common Shaker ladder-back wooden chair.
The Shaker tilting chair – named for its ball bearing or ball and socket button mechanism assembled to the back two legs of a wooden chair – allowed a person to lean back in the chair without slipping or scraping the floor. == Description == The device was a new practical way of being able to lean back without slipping while sitting in a common Shaker ladder-back wooden chair.
Source: Wikipedia "Shaker tilting chair" · CC BY-SA 4.0
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