O-ring forming sealing washer

A sealing assembly for imparting a seal within an elastomeric membranal member, said sealing assembly comprising:

• a sealing washer comprising a generally planar main body portion having an aperture centrally disposed therein;
• and
• a portion extending generally normal to the main body portion about the aperture and terminating at an exposed surface, the exposed surface defining a cutting edge, disposed radially outwardly of the aperture;
• an elongated fastener received in the centrally disposed aperture;
• the elastomeric membranal member having a fastener-receiving aperture therein;
• at least one relatively hard surface to which the elastomeric membranal member is secured;
• the elongated fastener received through the fastener-receiving aperture, with the sealing washer disposed between the elongated fastener and the fastener-receiving aperture, the elongated fastener adapted to be urged toward the relatively hard surface;
• a portion of the elastomeric membranal member surrounding the fastener-receiving aperture cut completely through by the cutting edge of the exposed surface of the sealing washer, said cut portion of the elastomeric membranal member defining a sealing ring about the elongated fastener within the aperture;
• and wherein the exposed surface is a beveled surface.