Structure

A structure, comprising:

• a resin-molded body;
• a core material;
• and
• a torsion spring, wherein:
• the resin-molded body comprises a front wall and a rear wall spaced apart from each other,
• the resin-molded body comprises a first portion, a second portion, and a hinge portion,
• the first portion and the second portion are rotatably coupled to each other with the hinge portion,
• the hinge portion is formed by making the rear wall concave toward the front wall to form a hinge concave portion and welding the rear wall to the front wall,
• the torsion spring comprises a first arm, a second arm, and a coil portion provided therebetween,
• the first arm is slidably supported by the first portion,
• the second arm is supported by the second portion,
• the hinge concave portion is provided between a side wall on a side of the first portion and a side wall on a side of the second portion,
• the first arm is inserted into the first portion through an insertion hole provided in the side wall on the side of the first portion,
• the rear wall of the first portion is provided with a contact concave portion at a part facing the first arm in the first portion,
• the contact concave portion is a depression defined in the rear wall, wherein the rear wall is depressed towards the front wall at the contact concave portion,
• the core material is disposed within the resin molded body, and
• the first arm is disposed, with respect to a direction perpendicular to a bottom surface of the contact concave portion, in a space between the contact concave portion of the rear wall and the core material.