Patent ID: 8326411

Claim:
A trunk width measuring unit, comprising: a unit main body; a first contact portion attached movably in the vertical direction relative to the unit main body, the first contact portion being configured to be brought into contact with an upper surface of a trunk of a user in a supine position, the first contact portion being made of a material extending in a horizontal direction; a second contact portion attached movably in the horizontal direction relative to the unit main body, the second contact portion being configured to be brought into contact with one side surface of the trunk of the user in the supine position; a third contact portion attached movably in the horizontal direction relative to the unit main body, the third contact portion being configured to be brought into contact with an other side surface of the trunk of the user in the supine position; a vertical width detection encoder for detecting a lowering distance of the first contact portion from an original position on the upper side of the trunk of the user to a contact point with the upper surface of the trunk; and a horizontal width detection encoder attached movably relative to the unit main body in conjunction with a moving distance of one contact portion among the second contact portion and the third contact portion, the horizontal width detection encoder being configured to detect a moving distance of the other contact portion relative to the one contact portion.