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US 4,050,091 AGranted
Manually-controlled pneumatically-actuated electric motor starter system
OwnerJohn H. Goettelinventor
Life of this patent
Estimating the term…
Abstract
A manually-controlled, pneumatically-actuated electric motor starter and overload protection system wherein actuation and automatic overload protection are accomplished wholly pneumatically without any electromagnetic actuating circuitry so as to render the system more reliable and shockproof regardless of age or deterioration.
Claims6
A manually-controlled, pneumatically actuated electric motor starter and overload protection system comprising:
- a. an electric motor;
- b. multiple electrical conduits connected to said motor for supplying electrical current thereto;
- c. multiple electrical switch means, each interposed in a respective one of said electrical conduits, for selectively permitting or interrupting the flow of said current therethrough;
- d. pneumatic actuating means connected to said multiple switch means for moving said multiple switch means in unison to positions permitting the flow of said current through said multiple conduits in response to the exposure of said pneumatic actuating means to a gas charge at a pressure above a predetermined pressure level;
- e. biasing means associated with said pneumatic actuating means and said multiple switch means for moving said multiple switch means in unison to positions interrupting the flow of said current through said multiple conduits in response to the reduction of the pressure of said gas charge to below said predetermined pressure level;
- f. motor-driven gas compressor means for supplying said gas charge at a pressure above said predetermined pressure level to said pneumatic actuating means;
- g. gas conduit means for conveying said gas charge from said compressor means to said pneumatic actuating means;
- h. multiple overload sensing means, each interposed in a respective one of said multiple electrical conduits, for sensing the presence of a current flow in any one of said electrical conduits greater than a predetermined current flow;
- i. multiple pneumatic overload valve means interposed in series in said gas conduit means between said pneumatic actuating means and said compressor means, each of said pneumatic overload valve means being connected to a respective one of said overload sensing means, for selectively permitting the exposure of said pneumatic actuating means to said gas charge at said pressure above said predetermined pressure level in response to the electrical current flow in each of said electrical conduits, as sensed by said multiple overload sensing means, being below said predetermined current flow, or for selectively reducing the pressure of said gas charge to below said predetermined pressure level in response to the electrical current flow in any one of said electrical conduits, as sensed by any one of said overload sensing means, being greater than said predetermined current flow;
- and
- j. manually-operable pneumatic valve means interposed in said gas conduit means between said pneumatic actuating means and said compressor means and in series with said multiple overload valve means for selectively permitting the exposure of said pneumatic actuating means to said gas charge at said pressure above said predetermined pressure level or reducing the pressure of said gas charge to below said predetermined pressure level, the portion of said gas conduit means between said manually-operable pneumatic valve means and said pneumatic actuating means being electrically nonconductive.
8 more elements
Dependencies are inferred from the claim text.