PROBLEM TO BE SOLVED: To provide a mount base swinging device which can achieve smooth swinging and can be used for a bed preventing pressure sore.SOLUTION: A mount base swinging device comprises: a mount base 1 a support body 2 for supporting the mount base 1 at the lower surface center on a floor F drive arms 55 located in other two points that form a triangle along with the center in a plane view and guide bodies 4 disposed in the vicinity of these drive arms 55 respectively. The support body 2 includes: an inner member 23 formed with a swollen outer peripheral surface 231 to be a convex spherical surface and an outer member 24 formed with an inner peripheral surface 241 on a concave spherical surface sliding along the convex spherical surface. In the drive arm 55, one end is swingably connected to a mutually different position in a circumferential direction at both ends of a drive shaft 53, and the other end is swingably connected to the lower surface of the mount base 1. The guide body 4 includes: an inner member 44 formed with a swollen outer spherical surface 441 to be a convex spherical surface an outer member 43 formed with an inner peripheral surface 431 on a concave spherical surface sliding along the convex spherical surface and a shaft member 45 which linearly and slidably penetrates through the inner member 44 in a vertical direction.COPYRIGHT: (C)2015,JPO&INPIT【課題】円滑な揺動を実現し床ずれ防止ベッドに好適に使用できる載台揺動装置を提供する。【解決手段】、載台1と、載台1をその下面中心でフロアF上に支持する支持体2と、平面視で上記中心と三角形をなす他の二点に位置させられた駆動アーム55と、これら駆動アーム55の近くにそれぞれ配設されたガイド体4とを備える。支持体2は、外周面231を膨出する凸状球面としたインナ部材23と、凸状球面に沿って摺動する凹状球面に内周面241を形成したアウタ部材24とを備える。駆動アーム55は、回転する駆動軸53の両端において周方向の互いに異なる位置に一端が揺動可能に連結されるとともに他端が載台1の下面に揺動可能に連結されている。ガイド体4は、外周面441を膨出する凸状球面としたインナ部材44と凸状球面に沿って摺動する凹状球面に内周面431を形成したアウタ部材43と、インナ部材44を上下方向へ直線摺動可能に貫通する軸部材45とを備えている。【選択図】 図1
