Clutch control pneumatic boost device
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United States of America Patent
Stats
-
Nov 6, 1990
Grant Date -
N/A
app pub date -
May 30, 1989
filing date -
May 27, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pneumatic boost device includes a booster input including a manually actuatable upstream pusher and a downstream pusher positioned such that the movement of the upstream pusher towards the piston causes the upstream pusher to contact and move the downstream pusher toward the piston. A compressed gas is supplied to the cylinder such that the piston is moved in a direction away from the booster input by a system including a gas flow path having a first check valve, the first check valve being seatable on a seat moving with the downstream pusher. Movement of the downstream pusher thus applies a gas pressure to the piston which moves by an amount corresponding to that of the upstream pusher. The downstream pusher has a piston in the additional cylinder. Another gas flow path has a second check valve, the second check valve being seatable on a seat moving with the upstream pusher by movement of the upstream pusher toward the piston. As a result, further movement of the upstream pusher toward the piston beyond a position where the second check valve seats on the seat moving with the upstream pusher causes the downstream pusher to move toward the piston independently of the upstream pusher.
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