Patent ID: 8418812
Filing Date: 2013-04-16
Classification: F01M

Abstract:
1. A drain plug for sealingly engaging a fluid drain hole in a fluid container, said drain plug comprising: a shaft, said shaft configured to be received in a passageway of the fluid container; a head portion at one end of said shaft, said head portion comprising a tool-engaging portion for receiving a tool for rotating said drain plug, and said head portion comprising a generally planar surface facing forwardly in the direction of said shaft and generally orthogonal to said shaft, said head portion having a perimeter edge portion spaced radially outwardly from said shaft; at least one annular rib disposed at said generally planar surface of said head portion, said at least one annular rib projecting forwardly from said generally planar surface in the direction of said shaft and disposed substantially concentrically with said shaft so that said at least one annular rib is spaced radially outwardly from said shaft to define a gap between said at least one annular rib and said shaft, and is spaced radially inwardly from said perimeter edge portion of said head portion to define a gap between said at least one annular rib and said perimeter edge portion, wherein a distal end of said at least one annular rib comprises the forwardmost portion of said head portion; and wherein said distal end of said at least one annular rib axially and compressively engages a deformable seal that is disposed substantially concentrically around the passageway of the fluid container when said shaft is driven into the passageway to secure said drain plug at the passageway of the container.