US PATENT SUBCLASS 188 / 304
.~.~.~ Dual pistons

Current as of: June, 1999
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188 /   HD   BRAKES

266  DF  INTERNAL-RESISTANCE MOTION RETARDER {29}
297  DF  .~ Having a thrust member with a variable volume chamber (e.g., coaxial or telescoping tubes, compensating reservoir) {7}
302  DF  .~.~ Rectilinear reciprocation of piston caused by arcuately oscillating frame, shaft, arm, axle, etc. {3}
304.~.~.~ Dual pistons

DEFINITION

Classification: 188/304

(under subclass 302) Device provided with two thrust members facing oppositely and spaced apart from each other, wherein a connection from said arm is positioned in the space between said members.

(1) Note. In most devices of this subclass the pistons reciprocate within the same cylinder in the same direction so that when one piston is moving toward one end of the cylinder, the other piston is moving away from the opposite end of that cylinder, both pistons being caused to move by an arcuately oscillating arm or load member.