Murphy bed
Folding bed
The original Murphy Bed was invented by Californian, William L Murphy
(although the term is now sometimes used for any folding bed which can
be stored in a cupboard). William Murphy actually got his first patent
for a folding bed in 1900, and in the same year he set up the Murphy
Door Bed Company". But the bed that most people think of when they
think of a Murphy Bed is the "pivot bed", with he invented in 1918, and
which pivoted into the doorway of a bedroom cupbiard. Murphy went on to
invent further space-saving furniture.

According to:

http://www.miketodd.net/lexicon/lex_m.htm