Patent ID: 8955851
Filing Date: 2015-02-17
Classification: F16B,F16J,Y10S

Abstract:
1. A metal annular gasket, comprising: an annular metal base plate having a hole portion; a compound layer integrally laminated on both upper and lower surfaces of said annular metal base plate, said compound layers being made of synthetic resin or a rubber material mixed with a fiber material; an annular seal layer made of one of: a synthetic resin and a rubber material, having a circumferential covering portion which is attached to the inner circumferential edge of said annular metal plate and the inner circumferential edge of both upper and lower compound layers, said circumferential covering portion defining an inner hole into which a tightening means is inserted, said tightening means for insertion into an inner hole formed by said circumferential covering portion, said tightening means having a head portion, a neck portion extending from said head portion with a smaller outer diameter than that of said head portion, and a screw portion extending from said neck portion, wherein: said annular seal layer is formed such that the upper and lower surfaces of said annular seal layer are so connected to the upper surface of said upper compound layer and the lower surface of said lower compound layer, respectively as to provide a smooth transition in a thickness direction of said annular seal layer; an annular salient projecting radially inward from said annular seal layer is further provided along an inner circumferential face of said circumferential covering portion, a thickness of said annular salient being smaller than a thickness of said circumferential covering portion; a diameter of said inner hole is formed so as to be larger than an outer diameter of said neck portion of said tightening means whereas a diameter formed by said annular salient is formed so as to be smaller than said outer diameter of said neck portion of said tightening means; and said annular salient has a uniform thickness and is so formed as to hold said neck portion of said tightening means in its outer circumference by the restoration resilience of said annular salient caused when said neck portion of said tightening means is inserted into said inner hole, said fiber material containing a rock wool and a polyamide fiber, and said circumferential covering portion being attached to the inner circumferential edge of said compound layers with a part of a rubber material of said circumferential covering portion impregnated into said compound layers.