Three-dimensional wave generating device and multifunctional motion bed having the same

A multifunctional motion bed comprising:

• a main mat supported by a frame and located at a lower portion;
• a bendable auxiliary mat placed on the main mat and located at an upper portion;
• a first air cell module connected to upper end portions of the main mat and auxiliary mat and inflated or deflated depending on whether air is supplied to adjust a deployment angle of the upper end portion of the bendable auxiliary mat;
• and
• a three-dimensional wave generator formed inside the main mat and configured to generate three-dimensional waves and transmit the generated three-dimensional waves to the auxiliary mat,
• wherein the three-dimensional wave generator includes:
• a housing to which a noise-preventing fixed frame, from which first, second, and third rotating shaft portions protrude, is coupled;
• a driver coupled to one end of the fixed frame and having a drive pulley;
• a third driven pulley rotatably coupled to the third rotating shaft portion, which protrudes from a center of the fixed frame, through a bearing;
• first and second driven pulleys rotatably coupled to the first and second rotating shaft portions, which protrude from the other end of the fixed frame, through a bearing to have a triangular arrangement structure with the third driven pulley;
• a power transmission belt connecting the drive pulley to each of the first to third driven pulleys;
• an eccentric shaft coupled to an upper surface of the third driven pulley and eccentrically rotated according to a rotation of the third driven pulley;
• a fixing portion formed on an upper surface of the eccentric shaft;
• and
• a vibration plate in close contact with a bottom surface of the auxiliary mat while being coupled to the fixing portion and configured to generate a three-dimensional wave through vibration of an upward-downward movement according to an eccentric rotation of the eccentric shaft and transmit the generated three-dimensional wave to the auxiliary mat,
• a first screw portion and a first locking groove are formed at an upper end of the first rotating shaft portion, and
• a safety member locked to the first locking groove to prevent rotation is fastened to the first screw portion so that the third driven pulley fit-coupled through a bearing is prevented from being separated from the third rotating shaft portion,
• wherein the safety member includes:
• a first safety ring fitted to an upper end of the third rotating shaft portion and having a first locking wing formed on an inner peripheral surface and at least one bendable second locking wing formed on an outer peripheral surface;
• and
• a second safety ring disposed above the first safety ring at the upper end of the third rotating shaft portion and having a second screw portion formed on an inner peripheral surface to be fastened to the first screw portion and at least one second locking groove formed on an outer peripheral surface,
• the first locking wing is locked and fixed to the first locking groove to prevent rotational loosening of the first and second screw portions, and
• the second locking wing is locked and fixed to the second locking groove while being bent to prevent the rotational loosening of the first and second screw portions.