Connection-state check tool used for assembling a pipe coupling

A connection-state check tool used for assembling a pipe coupling having a connection pipe and a coupling member, said connection pipe being provided with a projection extending along a circular direction of the outer surface of said connection pipe, said coupling member being provided with a connecting bore in which said connection pipe is inserted, said coupling member being provided with a pair of holes through which said connecting bore can be accessed from the outside of said coupling member, said coupling member being provided with engaging portions located near said connecting bore and corresponding to said pair of holes, said connection-state check tool comprising:

• a pair of arms with claws being inserted into said pair of holes so that said claws can be engaged with said engaging portions;
• and
• a frame-shaped handle connected to said arms, said handle having a split at a position opposite to said arms, said handle having elasticity, due to which said split can expand;
• in a state in which said connection pipe is inserted and positioned at a predetermined position in said connecting bore, said claws are pressed outward by said projection, so that said connection-state check tool is removed from said coupling member when said handle is pulled;
• in a state in which said connection pipe is inserted and not positioned at said predetermined position, said claws remain in place to clamp down on said engaging portion, so that, when said handle is pulled, the pulling force expands said split, which prevents the pulling force from being transmitted to said arms, and said connection-state check tool remains connected to said coupling member.