Drain socket and drain socket-equipped toilet bowl

Abstract

A drain socket includes a first connection part connected to a drain pipe of a toilet bowl; a second connection part connected to a drain piping in a floor or the like; and a drain channel body connecting the first connection part and the second connection part. The drain channel body includes an inclined part inclined to one side in the front-back direction toward a lower side. A restriction part is provided at an upstream end portion of the drain channel body. A surface of the restriction part located on the one side where the inclined part is inclined has a portion where a horizontal distance from a center C of the first connection part increases from the center of the surface in the left-right direction toward an end side of the surface in the left-right direction.

What is claimed is: 
     
         1 . A drain socket comprising:
 a first connection part connected to a drain pipe of a toilet bowl having a front side and a back side;   a second connection part connected to a drain piping;   a drain channel body connecting the first connection part and the second connection part, the drain channel body comprising an inclined part inclined to with respect a vertical direction, so that a lower end thereof is positioned more toward one of the front side or the back side of the toilet bowl than a upper end thereof; and   a restriction part provided at an upstream end portion of the drain channel body,   wherein the restriction part extends inwardly toward a center of the first connection part so as to have a side edge surface at the one, and in a plan view of the restriction part, the side edge surface is curved such that a distance between the center of the first connection part and the side edge surface increases from a middle of the side edge surface toward ends of the side edge surface in the plan view.   
     
     
         2 . The drain socket of  claim 1 , wherein a surface of the inclined part on a side opposite to the one is more inclined from the vertical direction on an upstream side than on a downstream side. 
     
     
         3 . The drain socket of  claim 1 , wherein an inclined surface is provided on a downstream side of the side edge surface of the restriction part, the inclined surface being inclined to a side opposite to the one toward a lower side in the vertical direction. 
     
     
         4 . The drain socket of  claim 1 , wherein a portion of the restriction part located on the one has a step surface extending in a direction crossing the vertical direction. 
     
     
         5 . The drain socket of  claim 1 , wherein at the one of the toilet bowl, an outer edge of the drain pipe is located inside an inner edge of the restriction portion with respect to a horizontal configuration of the drain pipe and the restriction portion. 
     
     
         6 . A drain socket-equipped toilet bowl, comprising:
 a toilet bowl having a drain pipe of the toilet bowl; and   the drain socket of  claim 1 .   
     
     
         7 . A drain socket comprising:
 a first connection part connected to a drain pipe of a toilet bowl having a front side and a back side;   a second connection part connected to a drain piping;   a drain channel body connecting the first connection part and the second connection part, the drain channel body comprising an inclined part inclined to with respect a vertical direction, so that a lower end thereof is positioned more toward one of the front side or the back side of the toilet bowl than a upper end thereof; and   a restriction part provided at an upstream end portion of the drain channel body,   wherein a surface of the restriction part located on the one has a portion where a horizontal distance between a center of the first connection part and a side edge surface of the restriction part increases from a center of the surface in a left-right direction toward an end side of the surface in the left-right direction.   
     
     
         8 . The drain socket of  claim 7 , wherein a surface of the inclined part on a side opposite to the one has a gradient closer to vertical on a downstream side than on an upstream side. 
     
     
         9 . The drain socket of  claim 7 , wherein an inclined surface is provided on a downstream side of the side edge surface of the restriction part, the inclined surface being inclined to a side opposite to the one toward a lower side in the vertical direction. 
     
     
         10 . The drain socket of  claim 7 , wherein a portion of the restriction part located on the one has a step surface extending in a direction crossing the vertical direction. 
     
     
         11 . The drain socket of  claim 7 , wherein a portion of the restriction part located on the one is located on the one relative to a portion, located on the one, of the drain pipe part of the toilet bowl.