Expansible chamber devices – Displacement control of plural cylinders arranged in... – By adjusting or limiting motion of relatively movable power...
Reexamination Certificate
2002-12-05
2004-06-01
Lazo, Thomas E. (Department: 3745)
Expansible chamber devices
Displacement control of plural cylinders arranged in...
By adjusting or limiting motion of relatively movable power...
C074S836000
Reexamination Certificate
active
06742441
ABSTRACT:
BACKGROUND
This invention relates, in general, to piston systems, such as continuously variable displacement pumps, engines, and compressors. Such devices are well known and many include a piston that reciprocates in a cylinder to achieve the pumping action. Many of these systems allow for varying the length of the piston stroke within the cylinder. These systems may include a movable member coupled to a drive shaft. The movable member is connected to the piston via a crankshaft, or similar member for varying the length of the piston stroke. In conventional devices, however, when the piston stroke is shortened, there often is a relatively large unswept volume in the cylinder. As used herein, an “unswept volume” is that section or volume inside the cylinder which is not reached by the piston at a given piston stroke. Large unswept volumes decreases the efficiency of the device. Therefore, what is needed is a device or method which controls or minimizes the unswept volume.
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Stephenson Stanley V.
Surjaatmadja Jim B.
Kice Warren R.
Lazo Thomas E.
Wustenberg John W.
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