Certain swinger
(Other definitions for hinge that I've seen before include "Moveable joint" , "Movable swinging joint" , "Moving joint" , "On what a door swings" , "Fastening for door etc" .)
(Other definitions for hammock that I've seen before include "Resting place slung under tree etc" , "Sailor's bed of ropes and canvas" , "Hanging cloth bed" , "A suspended canvas or rope bed" , "Bed tied between trees?B" .)