PROBLEM TO BE SOLVED: To provide an automatic clamp apparatus operating even during power failure without enlarging the apparatus by quickly shutting off flow without causing water hammer.SOLUTION: The automatic clamp apparatus comprises: a pushing member 2 including a clamping member for clamping a tube 20 a screw mechanism 8 for making the pushing member approach/retract with respect to the tube a drive motor 4 for driving the screw mechanism to axially separate the pushing member an elastic member 5 elastically energizing the pushing member towards the tube to clamp the tube via the clamping member and pushing-member holding means 6 capable of holding the pushing member at a prescribed position against the elastic force of the elastic member. The screw mechanism includes a pushing shaft 8a. The pushing member is held with respect to a structure member movably in the axial direction of the pushing shaft but non-rotatably. By releasing the holding of the pushing-member holding means, the rotation of the pushing shaft by the elasticity of the elastic member is permitted, so that the pushing member is brought close to the tube and the clamping member clamps the tube to shut off the flow of fluid.COPYRIGHT: (C)2016,JPO&INPIT【課題】ウォーターハンマを生じることなく流動を迅速に遮断でき、装置が大型化することもなく、停電中でも作動する自動クランプ装置を提供する。【解決手段】自動クランプ装置は、チューブ20を挟圧する挟圧部材を設けた押動部材2と、押動部材をチューブに対して近接退避させるネジ機構8と、ネジ機構を駆動して押動部材を軸方向に離間させることができる駆動モータ4と、押動部材をチューブに向けて弾力付勢し挟圧部材を介してチューブを挟圧できる弾性部材5と、押動部材を弾性部材の弾力に抗して所定位置に保持できる押動部材保持手段6とを備え、ネジ機構は押動軸8aを備え、押動部材は構造部材に対して、押動軸の軸方向移動可能にかつ回転不可能に保持され、押動部材保持手段の保持を解除することにより、弾性部材の弾力による押動軸の回転を許容して押動部材をチューブに向けて近接させ、挟圧部材がチューブを挟圧し流体の流動を遮断する。【選択図】図5
