Beds are made with solid blocks of ice as a base topped with a wooden bedspring and mattress.
From the ocregister.com
The sound thus derived not from a bedspring, as your cartoon suggested, but from a guitar string.
From the newscientist.com
With utmost precision, Powell measures the decline of a society in the curve of a false smile or the adulterous squeak of a bedspring.
From the time.com
A sawn-off tree trunk sits like an amputated torso, painted red, studded with a bedspring and a metal gas burner, and emblazoned with a symbol that looks like a crude approximation of a vagina.
From the telegraph.co.uk
More examples
(usually plural) one of the springs holding up the mattress of a bed
A box-spring is a type of bed base typically consisting of a sturdy wooden frame covered in cloth, and containing springs. Usually the box-spring is placed on top of a wooden or metal bedframe which sits on the floor and acts as a brace. ...