PROBLEM TO BE SOLVED: To switch a chip air circuit to an ON-state when using both water and chip air and to an OFF-state when using only water.SOLUTION: An opening/closing switching valve 4 is provided between a connection part 23 of the chip air circuit side of a handpiece body 2 and the chip air circuit 202 so as to perform an opening/closing operation on the surface of the handpiece body 2. Switching to the ON-state for causing the chip air to pass through from the connection part 23 of the chip air circuit side to the chip air circuit is performed by the opening operation of the opening/closing switching valve 4, and switching to the OFF-state of stopping the chip air and not causing it to pass through from the connection part 23 on the chip air circuit side to the chip air circuit is performed by the closing operation of the opening/closing switching valve 4.COPYRIGHT: (C)2013,JPO&INPIT【課題】水とチップエアーの両方を使う場合は、チップエアー回路をオン状態に切り替え、水だけを使う場合は、チップエアー回路をオフ状態に切り替える。【解決手段】ハンドピース本体2のチップエアー回路側の接続部23とチップエアー回路202との間に開閉切替弁4をハンドピース本体2の表面上で開閉操作可能に備え、開閉切替弁4の開操作によりチップエアー回路側の接続部23からチップエアー回路にチップエアーを通すオン状態に切り替え、開閉切替弁4の閉操作によりチップエアー回路側の接続部23からチップエアー回路にチップエアーを止めて通さないオフ状態に切り替える。【選択図】図2
