Abstract: The invention provides an interlacing air nozzle for increasing the airtightness thereof, wherein the dual-leverage principle thereof enables front and rear top members to simultaneously move up and down, and the front top member is also capable of pressing horizontally downward without abrading the structure as a whole. The main body of the invention includes a front top member, a rear top member, a connection piece, a base, a front base, a sliding member and an airtight washer member. The airtight washer member that is flexible using a spring is provided within the front top member, and the up-and-down movements thereof are employed for horizontally pressing the sliding member having an air inlet and a yarning groove above, thereby increasing the airtightness and practical values thereof.

Abstract: A carriage includes two or more beams each having a number of orifices for receiving a number of rods and for allowing the rods to be retained between the beams for supporting the objects to be heated by the kilns or furnaces. The beams each includes two end bulges each having a groove for receiving two ends of two bars, and for forming a stable supporting structure. The beams each includes a lower cavity and an upper projection for engaging with each other and for allowing the beams and the carriages to be superposed or piled with each other.