Sofa bed

William Brouwer developed the first sofa convertible frame style in the United States.

The primitive version of the Slide Away Bed was invented by Manning Lane, Warren J. Hauck and Roy O. Sweeney of Cincinnati, Ohio.

The knock-down sofa bed with hinged mattress patent was filed on September 5, 1978, and issued on May 27, 1980.

Sofa mattresses can be produced out of many different materials; the majority are made of springs or foam.

Some sleeping chairs are multifunctional furniture that can also function as a chaise longue or recliner when upright.