Patent ID: 8863930

Claim:
A rotating range restricting mechanism for a rotating body that restricts a rotating range of a rotating body which is rotatable 360 degrees or more with respect to a supporting body, comprising: a swing member which is rotatably attached to said supporting body; a first restricting member which is affixed or formed to said supporting body and abuts on said swing member when said swing member is rotated to one end of a swing range of said swing member to restrict the swing range; a first restricting member which is affixed or formed to said supporting body, and which restricts one end of a swing range of said swing member by abutting on said swing member when said swing member is rotated to the one end of a swing range of said swing member; a second restricting member which is affixed or formed to said supporting body, and which restricts the other end of the swing range of said swing member by abutting on said swing member when said swing member is rotated to the other end of the swing range of said swing member; an engaging member which is affixed or formed to said rotating body and engages with said swing member to allow said swing member to swing between a first restricting position, at which said swing member abuts on said first restricting member, and a second restricting position, at which said swing member abuts on said second restricting member; a first magnetic holding mechanism which holds said swing member in said first restricting position with a magnetic attraction force or magnetic repelling force; and a second magnetic holding mechanism which holds said swing member in said second restricting position with the magnetic attraction force or magnetic repelling force; wherein said first magnetic holding mechanism and said second magnetic holding mechanism are each provided with a permanent magnet fixed to said swing member and a magnetic member or a permanent magnet fixed to said supporting body.