Abstract: An adapter for association with a conventional grill for readily and selectively converting the grill for two-sided cooking of food products. Three different types of adjusting means are provided for varying the spacing between the platen and the grill cooking surface or compensating for warpage of the platen. With such fine adjustments, optimum cooking conditions can be achieved for all types and thicknesses of food products.

Abstract: A hinge device used with a rotation member having a rotational moment which varies in accordance with a rotation angle. The hinge device comprises a core bar inserted into a fixed member, a flat wire torsion spring fixed at its ends to the core bar and to the rotation members, respectively, a lever memer fixed to a portion of the core bar, and a first flat spring biasing the rotation of the core bar in a certain direction and having its ends abutting the fixed member and the rotation member. A second flat member is provided to operate against the spring torque of the flat wire torsion spring having its ends abutting the fixed member and the rotation member.