Weatherstrip member with floating interior bulb

Claim 1

A unitary extruded compressible weatherstrip seal member for a doorframe or the like comprising a longitudinally extending generally planar rigid base member, a continuous distortable flexible wall defining a primary loop member integrally connected to opposite edges of said base and dimensioned to define a continuous internal air space between the interior of said wall and said base and movable along an arcuate path relative to said base during compression, a continuous internal hollow bulb positioned within said primary loop, said bulb defining a secondary loop and including a common outer wall portion with said primary loop, hinge means interconnecting said primary and secondary loop at each end of said common wall portion said secondary loop extending into said air space such that said secondary loop is connected to said primary loop and said base only at said hinge means, and extending throughout the length thereof, said primary loop, said secondary loop, said common outer wall portions thereof, and said hinge means all integrally formed and defining with said base a seal movable between a relaxed condition and a compressed condition, said secondary loop positioned in spaced relation to said base and said flexible wall when said seal is in a relaxed configuration and movable along a path toward said base and generally parallel therewith when said seal wall is distorted by compression to preclude collapse of said flexible wall into direct contact with said base member and resultant reduction in seal efficiency.