Dual function sealing gasket

Claim 1

A hollow flexible sealing gasket having a uniform cross-section throughout its length, said gasket being formed of plastic material and comprising in its normal unstressed condition a relatively stiff base member; an outer cell wall extending upwardly from said base member and having spaced side wall portions and a top wall portion; an inner upper central cell wall extending downwardly from said top wall portion, said inner central wall having a pair of spaced side wall portions that downwardly diverge and then downwardly converge until they intersect, said inner central cell wall defining, with said top wall portion, an upper pentagonal central cell with the intersection of said wall portions being the lowest part of the pentagon, said top wall portion being substantially flat between said side wall portions of said inner central cell wall; and two downwardly diverging, inner divider cell walls extending from said intersection of said side wall portions to said base member, said inner divider cell walls defining an inner central lower triangular cell; all of said cell walls being flexible and substantially more flexible than said base member, said cell walls defining said upper pentagonal central cell, said lower triangular central cell and a pair of side cells on either side of said central cells.