Patent ID: 8662504

Claim:
A tight-seal construction comprising: a metal seal capable of torsional elastic deformation having a peripheral face and an inner peripheral face, in which a hitching peripheral groove is formed on the peripheral face; and a holding plate, composed of a thin plate having a through window portion, having a symmetrically disposed pair of strap elastic portions each of which is protruding from an inner peripheral end edge of the through window portion capable of freely and elastically deforming in axial directions and radial directions, and each of which is composed of end portions unitedly connected to the inner peripheral end edge, and each of which is defined in part by the through window portion on an axial side and by a respective cut-out on another axial side, the cut-outs being separate from the through window portion, one pair of U-shaped portions, and a hill-shaped portion convex toward the outer side in the radial direction with which the strap elastic portion can elastically move in the radial direction also when the holding plate is flat, and two projections formed unitedly with the strap elastic portion on middle positions of the hill-shaped portion and hitching to the hitching peripheral groove.