Abstract: This invention is a low profile, over-under conveyor with two continuously moving chain loops that form upper and lower tracks on which flexible work platforms ride. Each flexible platform includes two or more spaced metal slats joined by a thin flexible band. The slats include shoes that rest on and frictionally engage the moving chain loops. When one of the platforms reaches the end of one track, the flexible platform frictionally engages and compresses a pneumatic drive wheel and flexes to negotiate a low profile inversion and return on the other track. This allows the conveyor to handle long work platforms, while having a relatively low profile. Asynchronous accumulation and release of the freely moving flexible work platforms is accomplished using stop cylinders mounted inside the frame of the conveyor.

Abstract: A ventilation structure of a shoe sole of the present invention includes the shoe sole (1) formed with a through hole (5) vertically passing therethrough. The through hole (5) is fitted with a ventilation part (6). The ventilation part (6) comprises a flange portion (60) and the projection (61). The flange portion (60) engages the upper surface (2a) of the shoe sole (1) so that the ventilation part (6) does not drop off the through hole (5). The projection (61) extends into the through hole (5). The projection (61) is provided with a vent hole (62) vertically passing therethrough for the passage of air.