Sealing grid system for rotary piston mechanism of the Wankel type

In a rotary mechanism comprising a rotor having opposite side faces and peripheral surfaces intersecting each other to form apex portions and which rotor is supported for rotation within a cavity formed by a peripheral wall and opposite end walls of a housing, an apex seal means, including blade means at each apex portion to engage said peripheral wall, side seal assembly carried in at least one side face of the rotor for sealing the interstices between the one side face and the adjacent end wall of the housing and substantially isolating the working chambers formed by the rotor and said cavity, the side seal assembly comprises:

• a. a plurality of recesses in said one side face of the rotor;
• b. each recess extending in said one side face and along the juncture of the one side face and a peripheral surface between next adjacent apex seal means;
• c. a seal member slidably receivable in each of the recesses and dimensioned to extend between and in sealing abutting relation with next adjacent apex blade means;
• d. each seal member having a wear surface for engaging the adjacent housing end wall;
• e. a groove in each of said recesses;
• and
• f. a biasing member having two resilient leg portions disposed in each groove to bias the associated seal member in a direction outwardly of the recess and its wear surface in contact with the adjacent housing end wall and simultaneously effecting a seal of the space between the recess and its associated seal member.