Patent ID: 8769735

Claim:
A drainage device adapted to a basin in kitchen or bath comprising: a drainage mechanism placed on a lower outlet of the basin, comprising: a downspout body comprising an upper pipe and a lower pipe threaded engaged with the upper pipe, a rotatable linkage unit located in the lower pipe, which is capable of bending and stretching in a vertical direction, a guide unit located in the upper pipe for guiding vertical movement, and a pipe cover connected with an upper portion of the guide unit, an operating mechanism for controlling to open and close the pipe cover of the drainage mechanism, and a coupling member led from the sidewall of the downspout body, wherein one end of the coupling member is connected with the linkage unit, and the other end of the coupling member is connected with the operating mechanism, wherein the operating mechanism comprises: a sliding shaft connected with the coupling member, having a head and a tail, a fixing casing with a hollow structure, wherein the sliding shaft is slidably located in the fixing casing, a spring mounted on the lower end of the fixing casing at a position to resist the sliding shaft from head to tail, and an operating member connected with the tail of the sliding shaft for controlling the sliding shaft, wherein the sliding shaft has a first position and a second position provided therein for keeping the sliding shaft stopping at different heights, wherein the first position is nearer to the head of the sliding shaft than the second position, wherein operating mechanism further comprises a stop hook having a hook member and a connecting member for fixing the stop hook, and the sliding shaft has a first unidirectional sliding slot in the surface thereof to guide the sliding shaft matched with the hook member of the stop hook to move from the first position to the second position, and a second unidirectional sliding slot in the surface thereof to guide the sliding shaft matched with the hook member of the stop hook to move from the second position to the first position, wherein the first unidirectional sliding slot comprises a first sliding segment starting from the first position, and a second sliding segment connected with the first sliding segment and extended to the second position, wherein a first joint of the first sliding segment and the second sliding segment is farther to the head of the sliding shaft than the second position, wherein the second unidirectional sliding slot comprises a third sliding segment starting from the second position, and a fourth sliding segment connected with the third sliding segment, wherein a second joint of the third sliding segment and the fourth sliding segment is farther to the head of the sliding shaft than the second position, wherein the fourth sliding segment is communicated to the first sliding segment, or connected with the first position.