Threshold with flexible insulator

An insulating adjustable threshold comprising;

• an elongated sill, an arched flexible means projecting above said sill, said arched flexible means being integral and having a first elongated edge, a second elongated edge and an intermediate flexible member between said edges, means supporting said arched flexible means for controlling the height of said arched flexible means, said flexible means supporting means including a first elongated stationary recess in said sill for retaining said first elongated edge therein and an elongated movable edge supporting means having a second edge retaining recess therein in spaced relation to said first recess, means for displacing said elongated movable edge supporting means to alter the height of said arched flexible means, said movable elongated member including a series of blocks, each of said blocks having a recess for retaining said second elongated edge, means for displacing each of said blocks to adjust the height of said flexible member, and an elongated facial plate mounted on said sill adjacent to said series of blocks and said means for displacing each of said blocks.