Patent ID: 8663045

Claim:
A seal chain, comprising inner and outer links, connecting pins and bushes, each having a proximal end and a distal end; each of said inner links comprising first and second inner link plates forming a pair of inner link plates having bush holes to mount first and second bushes, wherein the proximal end of the two bushes are fixed into bush holes of the first inner link plate and the distal end of the two bushes are fixed to bush holes of the second inner link plate; said outer links comprising first and second outer link plates arranged in pairs to connect adjacent inner links into said seal chain, wherein the first outer link of a pair is positioned adjacent the proximal end of the two bushes and the second outer link is position adjacent the distal end of the two bushes, said outer link plates having pin holes at each end, said connecting pins being fitted and fixed into said pin holes, said inner and outer links being linked sequentially by loosely fitting said connecting pins of said outer links respectively into the bushes of the two inner links adjacent in a longitudinal direction, the bushes having interior peripheral surfaces receiving the outer peripheral surfaces of said pins, the outer surface of said first inner link plate confronting the inner surface of said first outer link plate in spaced relation to provide a lubricant-receiving space therebetween; and seal mechanisms disposed respectively between said confronting surfaces of the first inner and first outer link plates to define a reservoir for lubricant connected to the space between an inner peripheral surface of said bush and an outer peripheral surface of said pin; said each seal mechanism comprising: an inner circumferential ring fitted and fixed onto the end of the bush and having a surface confronting said lubricant-receiving space; an annular seal-receiving member spaced from said inner circumferential ring, and an annular radial seal in said seal-receiving member so as to be movable in a direction radially of said pin said seal receiving member with the annular radial sealing member being mounted on the inside of the outer link plate; a bellows seal extended between the inner circumferential ring and the annular seal receiving member and deformable in the radial direction of said pin; and a seal ring provided on the side of the outer link plate facing to the inner link plate at position corresponding to the position of said annular radial sealing member concentrically with the pin to abut with the annular sealing member to seal the lubricant reservoir.