flick knife; switchblade; spring-loaded knife

A lock containing a spring mechanism that allows it to snap shut or spring open automatically, such as a nightlatch.

spring balance; a type of scale that measures weight or force by the stretch or compression of a spring

A bed or mattress equipped with supportive metal springs; a spring mattress

A door equipped with springs that allow it to swing in both directions and close automatically.

A type of steel with high elasticity used for making springs; commonly used in industry for leaf springs, coil springs, and clockwork.

spring washer; lock washer with a split or wave used to prevent loosening through vibration; lock washer