Robert J Durkin, Age 726624 W Mallard Ln, Woodbury, IN 46055

6266878, Jul 31, 2001

Feb 2, 1999

9/243178

Robert John Durkin - Bluffton IN
Steven Lee Worthington - Decatur IN

Amcast Industrial Corporation - Dayton OH

B23P 1500

29888044

Variable displacement pistons are produced wherein hollow piston bodies are integrally formed with associated actuator arms to ensure proper alignment of the bodies and rods. The process utilizes a two-axis press to first form a pair of actuator arms by working a blank of metallic material along a first axis between opposing members of a die assembly. With the die assembly still closed after formation of the actuator arms, a pair of hollow piston bodies are formed by extruding the remainder of the blank of metallic material along a second axis. The hollow piston bodies are axially aligned and integrally formed with respective ones of the actuator arms. A piston head is welded to the end of each hollow piston body which is then machined. By separating the actuator arms from one another, a pair of variable displacement compressor pistons having hollow piston bodies axially aligned and integrally formed with respective actuator arms are thus formed.

4865674, Sep 12, 1989

Oct 6, 1988

7/254047

Robert J. Durkin - Elkhart IN

Elkhart Products Corporation - Elkhart IN

B32B 3100
H05B 340

156158

A method of connecting two thermoplastic pipes and joint resulting therefrom which includes an electrically conductive insert sleeve with radially extending barbs alternately projecting to the inside and outside diameter of the sleeve into the adjacent fused plastic to achieve the joint.