Patent ID: 8241207

Claim:
A connection mechanism for connecting an operation section of an endoscope, comprising: a plate member formed with a polygonal hole, the plate member including a first plate and a second plate overlaid with each other, each of the first plate and the second plate being formed with the polygonal hole; a shaft member formed with a polygonal column section fitted in the polygonal hole formed on the plate member; and a fixing mechanism that fixes the first plate and the second plate with each other to retain a status where the first plate and the second plate are urged oppositely in a rotational direction about a central axis of the shaft member, wherein the first plate is formed with a recess in which the second plate is fitted, wherein the second plate is formed with a V-shaped groove extending along a circumferential surface thereof, and wherein the fixing mechanism includes: a screw hole formed in the first plate extending from an outer periphery of the first plate to an outer periphery of the second plate fitted in the recess, the screw hole extending in a direction deflected from a direction toward the central axis of the shaft member; and a screw insertable in the screw hole, wherein when the screw is inserted in the screw hole, the screw urges the first plate and the second plate oppositely in the rotational direction about the central axis of the shaft member, and engages the V-shaped groove such that the second plate is urged towards the first plate along the direction of the central axis of the shaft member.