Floating joint and ultrasonic vibration joining apparatus

A floating joint comprising a first connection and a second connection in which the first connection and the second connection are coupled with each other, wherein

• said first connection includes
• a shaft body, and
• a spherical portion for contact whose bottom surface is coupled with a tip of said shaft body and whose surface has a spherical shape, said spherical portion for contact having a bottom surface exposed region being a part of the bottom surface of said spherical portion for contact protruding outward from an outer circumference of the tip of said shaft body,
• said second connection includes
• a frame body having a recessed space that receives said spherical portion for contact, said recessed space accommodating the spherical portion for contact, said frame body having a bottom surface portion having a flat plate shape serving as a bottom surface of said recessed space and a side surface portion serving as a side surface of said recessed space, said bottom surface having an one-side spherical contact relationship in which a part of a surface of said spherical portion for contact is in contact with a part of said bottom surface portion, and said side surface portion having a shaft body facing region facing said shaft body,
• said shaft body is configured such that a first connection object is attachable thereto and said frame body is configured such that a second connection object is attachable thereto,
• said floating joint further comprises:
• a fixing member coupled with said frame body in said shaft body facing region and having a bottom surface facing region facing said bottom surface exposed region;
• and
• a pressure adjusting member provided between said bottom surface exposed region of said spherical portion for contact and said bottom surface facing region of said fixing member without a gap, and having elasticity,
• a contact state in which the surface of said spherical portion for contact is in contact with the part of said bottom portion is maintained, by an elastic power of said pressure adjusting member, and
• said surface of said spherical portion for contact has no other contact relationship other than said one-side spherical contact relationship.