Drain trap assembly

A drain trap assembly for a sanitary appliance, the drain trap assembly comprising:

• a drain trap (30) comprising an inlet (31) provided in an upper portion of the drain trap and configured to allow water discharged from a sanitary appliance (1) to enter therethrough, a storage space (32) provided inside a lower portion of the drain trap, an outlet (33) provided in a peripheral portion of the drain trap and configured to allow water in the storage space (32) to be discharged therethrough when the water exceeds a predetermined water level, and a seal water pipe 34 extending from the inlet (31) to the storage space (32);
• and
• an outlet pipe (20) connected to the outlet (33) through a joint and configured to allow water from the drain trap (30) to be discharged to a sewer pipe therethrough,
• wherein the outlet pipe (20) comprises a catch groove (22) provided on an outer circumferential portion of a insertion end (21) inserted, into the outlet (33), and
• the joint comprises:
• a joint housing (600) provided on one side of the periphery of the drain trap (30) to have the outlet (33) and comprising a guide slot (601) extending across the outlet (33);
• a lock plate (700) configured to be inserted into the guide slot (601) to be movable in a penetrating direction of the guide slot (601), comprising a through-hole (711) allowing the insertion end (21) to pass therethrough, the through-hole (711) being aligned with or misaligned from the outlet (33) depending on a moving direction, and a catch portion (712) provided on an inner circumferential portion of the through-hole (711), wherein, when the through-hole (711) is misaligned from the outlet (33), the catch portion (712) is fitted into the catch groove (22) of the insertion end (21) inserted into the outlet (33), thereby preventing the insertion end (21) from being separated;
• and
• an elasticity applying means (800) to apply elastic force to the lock plate (700) to move the lock plate (700) in a direction in which the through-hole (711) is misaligned from the outlet (33).