PROBLEM TO BE SOLVED: To improve operability of opening operation for bringing an opening/closing connection annular part (opening/closing arm) into an opened annular state, the opening/closing connection annular part retained in a closed annular state by means of engagement with an opening motion prevention part retaining an engaged posture by a strong energization force.SOLUTION: The connection tool is composed of: a case body 1 an opening/closing connection annular part 2 including one end engageable with the case body 1 and freely rotated to be opened/closed an opening motion prevention part 3 preventing an opening motion of the opening/closing connection annular part 2 and a cancellation lever part 4 canceling an opening motion disabled state of the opening/closing connection annular part 2. The cancellation lever part 4 presses and moves the opening motion prevention part 3 by double force action through the lever principle, the opening motion prevention part retaining an engaged posture with the opening/closing connection annular part 2 by means of energization force of an energization body 7, and the cancellation lever part thereby cancels the engaged state between the opening/closing connection annular part 2 and the opening motion prevention part 3.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】強大な付勢力によって係合姿勢を保持する開き動作阻止部との係合により閉塞環状態が保持されている開閉連結環部(開閉腕)を開放環状態にする開き操作の操作性をより向上させることを目的とする。【解決手段】ケース体1と、このケース体1に一端を係脱自在に設けて開閉回動自在に設けた開閉連結環部2と、この開閉連結環部2の開き動作を阻止する開き動作阻止部3と、前記開閉連結環部2の開き動作不能状態を解除する解除レバー部4とから成り、付勢体7の付勢力により開閉連結環部2との係合姿勢を保持する開き動作阻止部3を、てこの原理により倍力作用で押動し、この開閉連結環部2と開き動作阻止部3との係合状態を解除する解除レバー部4を設けた連結具。【選択図】図1
