Face seal with resilient packing ring forcing face rings together

An improved mechanical seal for sealing a rotating shaft extending through a bore, comprising in combination:

• a rotating ring having a rotating face and carried by the shaft for rotation therewith;
• a nonrotating ring having a stationary face that sealingly engages the rotating face, and having a cylindrical portion carried within the bore that has an inner diameter greater than the shaft diameter;
• the cylindrical portion having an annular recess on its exterior with an outward wall;
• the bore having a groove containing an elastomeric packing ring that sealingly engages the recess;
• the outward wall of the recess being located to deform the packing ring inwardly when the stationary face contacts the rotating face, causing the packing ring to exert an outward force on the nonrotating ring.

An improved mechanical seal for sealing a rotating shaft extending through a bore, comprising in combination:

• a rotating ring having a rotating face carried rigidly by the shaft;
• a nonrotating ring having a circular nonrotating face that sealingly engages the rotating face, and having a cylindrical portion slidingly carried within the bore that has an inner diameter greater than the shaft diameter;
• the bore having a groove of rectangular cross-section that contains an elastomeric O-ring of circular cross-section;
• the cylindrical portion having an annular recess on its exterior with an arcuate outward wall having a point of maximum depth, the radius of the outward wall being greater than the depth of the recess;
• the distance from the point of maximum depth of the recess to the nonrotating face being greater than the distance from the center of the groove to the nonrotating face, causing the O-ring to exert an outward force against the outward wall.