Stone walls do not a prison make,
Nor iron bars a cage.
Lovelace.
3. (Carp.) An outer framework of timber, inclosing something within it; as, the cage of a staircase. Gwilt.
4. (Mach.) (a) A skeleton frame to limit the motion of a loose piece, as a ball valve. (b) A wirework strainer, used in connection with pumps and pipes.
5. The box, bucket, or inclosed platform of a lift or elevator; a cagelike structure moving in a shaft.