MOVABLE FLOOR DEVICE FOR POOL OR THE LIKE

PROBLEM TO BE SOLVED: To provide a movable floor device capable of easily holding a movable floor 3 in a desired height by a few operations though it can be constituted simply. SOLUTION: The movable floor device has supporting columns 10 freely rotated from the first state approximately parallel with the rear of the movable floor 3 to the second state vertical to the rear on the rear of the floor 3. The supporting columns 10 have a plurality of air cylinders 4. Engaging holes 6, with which the front end sections of rods 5 for the air cylinders 4 of the supporting columns 10 brought under the second state are engaged, are formed to a fixed floor 2. One tips of thin wires 7 in which the other tips are connected to winding means 9 secured near the insides of the engaging holes 6 are coupled at the front ends of the rods 5. A pulling-up means 13 capable of lifting the movable floor 2 is mounted. The winding means 9 are urged in the direction that the thin wires 7 are wound under a free state, and the thin wires 7 are made to go in and out freely with the rotation of the supporting columns 10.