Patent ID: 8523155

Claim:
A fluid passage connection device comprising a first coupler fitted to a stationary base member and a second coupler that can be connected to the first coupler and that is fitted to a movable member, constituted so as to connect and separate a fluid passage through the first coupler and the second coupler, comprising: a positioning mechanism for positioning the movable member with respect to the base member, so that it becomes possible for the first coupler and the second coupler to connect together; and a clamping mechanism that clamps the movable member with respect to the base member, with an elastic force of an elastic member or an enclosed compressed gas, and that releases this clamping with a fluid pressure of a fluid pressure cylinder; the first coupler comprising a connection member that is provided so as to be shiftable in its axial direction and connects a fluid passage in an engaged state with the second coupler, a spring that elastically biases the connection member so as to project, and a fluid pressure operation chamber that applies a fluid pressure to drive the connection member so as to retract; and a fluid passage in the base member extending between the fluid pressure operation chamber of the first coupler and an unclamping fluid chamber of the fluid pressure cylinder of the clamping mechanism; and wherein said fluid passage applies fluid pressure supplied from a fluid pressure source contemporaneously and commonly to both of the fluid pressure operation chamber and the unclamping fluid chamber.