Bacon & Thomas
Drop head structure
 The present invention relates to a water drop structure which not only functions as a water drop but also prevents pests from intruding indoors, smell from leaking indoors, and sewage back flow when the robe is clogged. It has a main body, main drum, control floating ball, upper partition, and an upper cover. The main body has a positioning flange, main through hole, let-in sheet to form a let-in slot, and a main drum having a lower through hole, union sheet, and upper partition having a spacer with a recess, upper through hole, and its peripheral having union sheet, the upper cover having water drop hole, and the bottom having extension hood with inside diameter smaller than that of upper partition. The main drum and upper partition may be set in the main drum, and an upper cover can be assembled in the upper partition. The control floating ball is located between the main drum and upper partition, and extension hood and upper partition recess to form a flow passage for sewage flow, and with the function of control floating ball it may seal the lower through hole when there is no water drop to prevent entry of pests and smell. The control floating ball shall float up owing to water when the tube is clogged, and therefore seal the upper through hole for preventing water back flow. 
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Wen-Hsing
Wang