Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1989-05-30
1990-11-06
Wayner, William E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91376R, 91519, F15B 910
Patent
active
049676440
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.
REFERENCES:
patent: 2226821 (1940-12-01), Kempson
patent: 4881449 (1989-11-01), Horiuchi et al.
Renault Vehicules Industriels
Wayner William E.
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