Drain apparatus

Abstract

A drain apparatus includes a drain body, a stem, a stopper and at least one torsion spring. The drain body has a drain passage therethrough and a frame radially extending across the drain passage. The stem has a shank and one end connected to the frame. The shank has a chamber, at least one first aperture and at least one second aperture opposite to the first aperture. The stopper is configured to seal the drain passage of the drain body, and has a tube extending therefrom. The tube of the stopper is movably mounted around the stem. The torsion spring is disposed in the chamber of the shank. The torsion spring has two ends laterally engaged in the first aperture and the second aperture of the shank to abut against an inner wall of the tube of the stopper.

What is claimed is: 
     
         1 . A drain apparatus, comprising:
 a drain body having a drain passage therethrough and a frame radially extending across the drain passage;   a stem having a shank and two connecting portions at opposite ends of the shank, one of the two connecting portions connected to the frame of the drain body, the shank having a chamber therein, at least one first aperture defined in a side of the shank, and at least one second aperture defined in opposite side of the shank and corresponding to the first aperture, the first aperture and the second aperture each communicating with the chamber of the shank;   a stopper configured to seal the drain passage of the drain body, and having a tube extending therefrom, the tube movably mounted around the stem so that the stopper is axially movable relative to the drain body; and   at least one torsion spring disposed in the chamber of the shank, the torsion spring having two ends laterally engaged in the first aperture and the second aperture of the shank, and protruded from an outer periphery of the shank to abut against an inner wall of the tube of the stopper.   
     
     
         2 . The drain apparatus as claimed in  claim 1 , wherein each of the connecting portions of the stem defines an external thread at an outer periphery thereof; and the frame of the drain body has a threaded hole in a center thereof for being connected with the respective connecting portion of the stem. 
     
     
         3 . The drain apparatus as claimed in  claim 1 , wherein the torsion spring has a coil portion and two hook portions extending from two ends of the coil portion; the two hook portions are slightly narrower than the first aperture and the second aperture of the shank; and the two hook portions are partly received in the first aperture and the second aperture of the shank respectively. 
     
     
         4 . The drain apparatus as claimed in  claim 1 , wherein the stopper further has a knob at a top thereof and a flange defined between the tube and the knob. 
     
     
         5 . The drain apparatus as claimed in  claim 1 , wherein the shank of the stem defines a lock hole in the outer periphery thereof; a bolt is fastened in the lock hole; and the tube of the stopper defines a slot therethrough for accommodating the bolt. 
     
     
         6 . The drain apparatus as claimed in  claim 4  further comprising a gasket disposed under the flange of the stopper.