Patent ID: 7871219

Claim:
A connection mechanism, comprising: a shaft member formed with an outer-screw portion which is formed with an outer screw; a plate member formed with a connection hole in which the shaft member is fitted; a nut member formed with an inner-screw to engage with the outer-screw of the shaft member, the nut member engaged with the shaft member being urged toward the plate member fitted on the shaft member to fixedly secure the plate member onto the shaft member, wherein the plate member is further formed with a recess in which the nut member is fitted; and a fixing mechanism including: a screw hole formed in the plate member extending from an outer periphery of the plate member to an outer periphery of the nut member 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 inserted in the screw hole, wherein the screw amplifies a fastening force between the plate member and the nut member such that the plate member and the nut member are urged oppositely in a rotational direction about a central axis of the shaft member so that the contacting force between the plate member and the nut member increases.