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US 4,541,324 AGranted
Vacuum actuator with fail-safe system
AssigneeNissan Motor Co., Ltd.
InventorKimio Tomita
Life of this patent
Estimating the term…
Abstract
A vacuum responsive switch for detecting a failure in creation of a control vacuum within the control diaphragm chamber. A solenoid valve is provided which functions to equalize pressure within one of a power diaphragm chamber and a leak chamber with the other when vacuum represented by a signal from the vacuum responsive switch is lower than a predetermined value.
Claims5
A vacuum actuator comprising:
- a housing;
- a power diaphragm mounted within said housing and having one side defining a power diaphragm chamber and an opposite side defining a leak chamber;
- a push rod fixedly connected to said power diaphragm and movable therewith;
- a source of power vacuum connected with said power diaphragm chamber;
- means for biasing said push rod and said power diaphragm toward said leak chamber;
- means defining a passage having one end communicating with said power diaphragm chamber and an opposite end communicating with said leak chamber;
- means, including a valve element cooperating with said passage, for controlling flow communication between said power diaphragm chamber and said leak chamber;
- means for detecting a failure in normal operation of said flow communication controlling means and generating an output signal;
- and
- means responsive to said output signal for rendering substantially the same pressure to prevail in both of said power diaphragm chamber and said leak chamber.
7 more elements
Dependencies are inferred from the claim text.