US 12,410,820 B2
Drainage device and drainage system
Hiroyuki Nakayama, Osaka (JP); Okihito Kosuge, Osaka (JP); and Yoshiomi Hamano, Osaka (JP)
Assigned to GEX CORPORATION, Osaka (JP)
Appl. No. 18/569,123
Filed by GEX CORPORATION, Osaka (JP)
PCT Filed Mar. 22, 2022, PCT No. PCT/JP2022/013000
§ 371(c)(1), (2) Date Dec. 11, 2023,
PCT Pub. No. WO2023/286372, PCT Pub. Date Jan. 19, 2023.
Claims priority of application No. 2021-116122 (JP), filed on Jul. 14, 2021; and application No. 2021-193180 (JP), filed on Nov. 29, 2021.
Prior Publication US 2024/0183364 A1, Jun. 6, 2024
Int. Cl. F04F 10/02 (2006.01); A01K 63/04 (2006.01)
CPC F04F 10/02 (2013.01) [A01K 63/047 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A drainage device provided inside a water tank, and including a siphon mechanism formed of a siphon pipe and a cylindrical portion, the drainage device comprising:
the siphon pipe including a first opening an upper portion of which is opened on one end side, and including a first connection portion connected to an overflow pipe on the other end side; and
the cylindrical portion having an inner diameter larger than the siphon pipe, and having a second opening a lower portion of which is opened and into which the first opening of the siphon pipe is inserted, the second opening set in a position lower than the first opening,
wherein a second connection portion for selectively connecting an inside of the cylindrical portion to an air supply unit or atmosphere is provided on an upper surface of the cylindrical portion.