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When a suction button is pushed in a pushing operation direction, the suction button pushes down longer lever ends of inversion levers, shorter lever ends of the inversion levers are pushed up based on a seesaw operation and the principle of leverage, and a piston body coupled through a coupling bod

When a suction button is pushed in a pushing operation direction, the suction button pushes down longer lever ends of inversion levers, shorter lever ends of the inversion levers are pushed up based on a seesaw operation and the principle of leverage, and a piston body coupled through a coupling body moves in a direction opposed to a pushing operation direction against an urging force of a spring in cooperation with this upward movement. As a result, a valve moving portion moves away from a valve receiving portion to open a suction duct valve portion and suction is carried out, but the piston body retires to an outer periphery side of a bent duct when the valve portion is opened, and hence a suction duct is widened, thereby facilitating suction of even, e.g., a fluid having high viscosity.

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1. An endoscope sucking operation apparatus comprising: a suction duct valve portion that opens a suction duct when a pushing operation is performed with respect to a suction button of an endoscope operating portion;a piston body which closes the suction duct valve portion when urged in a pushing op

1. An endoscope sucking operation apparatus comprising: a suction duct valve portion that opens a suction duct when a pushing operation is performed with respect to a suction button of an endoscope operating portion;a piston body which closes the suction duct valve portion when urged in a pushing operation direction of the suction button and opens the suction duct valve portion when moved toward the suction button side from a closing position; andan inversion movement mechanism that cooperates with the pushing operation of the suction button and moves the piston body in a direction opposite to the pushing operation direction,wherein the inversion movement mechanism comprises an inversion lever that performs a seesaw operation arranged coaxially with an axis of the suction button in an operating direction, and an operation end of the suction button is coupled with one end of the inversion lever whilst an operation end of the piston body is coupled with the other end of the inversion lever,wherein an axis of the suction button in the operating direction is arranged to be substantially coaxial with an axis of the piston body, andwherein the suction duct valve portion is closed when the suction button is not operated, and the suction duct valve portion is moved in the direction opposite to the pushing operation direction against an urging force of the piston body to be opened when the pushing operation is performed with respect to the suction button. 2. The endoscope sucking operation apparatus according to claim 1, wherein the piston body is arranged so as to reciprocate with respect to an operating direction path formed in a support main body, a bent duct formed to be bent toward a support main body side surface from the operating direction path is provided as the suction duct, a valve receiving portion is arranged at a proximal end of the bent duct on the operating direction path side, and the valve receiving portion and a valve moving portion provided below the piston body constitute the suction duct valve portion. 3. The endoscope sucking operation apparatus according to claim 1, wherein the piston body is arranged so as to reciprocate with respect to a longitudinal path formed in a support main body; wherein the apparatus further comprises a bent duct provided as the suction duct, the bent duct formed to be bent from the longitudinal path toward a side surface of the support main body at a substantially right angle; andwherein the suction duct valve portion opens/closes a valve through the bent duct when a valve moving portion performs an opening/closing operation, a valve receiving portion being arranged at a proximal end of the bent duct on the longitudinal path side, the valve moving portion being provided at a lower portion of the piston body so as to be pressed to the valve receiving portion when the suction duct valve portion is closed. 4. The endoscope sucking operation apparatus according to claim 1, wherein the inversion movement mechanism comprises a pair of inversion levers which are arranged on both sides of the axis of the piston body, which operate by the principle of leverage, each of the inversion levers having a short lever end and a long lever end,wherein the endoscope sucking operation apparatus further comprises a coupling body that couples the short lever ends of the inversion levers and the axis of the piston body, andwherein when the suction button pushes down the long lever ends of the inversion levers, the piston body moves in the direction opposite to the pushing operation direction through the coupling body. 5. The endoscope sucking operation apparatus according to claim 4, wherein the coupling body has engagement claws protruding in the horizontal direction at its both ends, and the short lever ends of inversion levers are arranged with the engagement claws.