Patent ID: 8109737

Claim:
A compressor comprising: (a) a case; (b) first and second cylinder housings having opposite outer and inner ends, said housings being connected to said case, each said first and second housings respectively defining first and second generally cylindrical piston bores; (c) an outer cylinder head on the outer end of each of first and second cylinder housings; (d) an inner cylinder wall at the inner end of each of said first and second cylinder housings; (e) a first reciprocating piston in said first piston bore defining first and second chambers on opposite sides of said first piston; (f) a second reciprocating piston in said second bore defining third and fourth chambers on opposite sides of said second piston; (g) a scotch yoke in said case, said scotch yoke having two generally L-shaped components each having a long leg and a short leg, one of said legs having a projection and the other said leg having a seat, said legs connectable with the projection on one leg interlocking with the seat on the other leg to define a yoke defining a bearing surface; (h) a crank shaft having a bearing member reciprocable along with said bearing surface; (i) a first connecting rod extending through said inner cylinder wall of the first housing and connecting said first piston to said scotch yoke; (j) a second connecting rod extending through said inner cylinder wall of the second housing and connecting said second piston to said scotch yoke; and (k) exhaust valves and inlet valves located on the cylinder housings adjacent the first, second, third and fourth chambers.