Automatic transfer switch
AssigneeBrown Industrial Gas, Inc.
InventorsJames A. Becker, Lawrence F. Freitag, Frank W. Kussy
Life of this patent
Estimating the term…
Abstract
An automatic electric load transfer switch incorporates an over-the-center spring mechanism to operate switch contacts. The spring mechanism has a first position at which the electric load is connected to one electricity source and a second position at which the load is connected to another electricity source. The spring mechanism is driven by a solenoid activated cam shaft. An apparatus is provided for halting the movement of the spring mechanism at a position intermediate the first and second positions at which the load is not connected to either electricity source. The halting apparatus is releasable so that the spring mechanism can continue its movement between the first and second positions.
Claims14
A transfer switch comprising:
- a means for alternatively connecting an electric load to one of two sources of electricity;
- an over-the-center spring mechanism operatively coupled to said connecting means, said spring mechanism having a first position at which the load is connected to one of the sources of electricity, a second position at which the load is connected to the other source, and an intermediate position between the first and second positions;
- means for driving the over-the-center spring mechanism from the first and second positions past the intermediate position;
- means for halting the movement of the over-the-center spring mechanism during its movement between the first and second positions in a position at which the load is not connected to either source of electricity.
A transfer switch comprising:
- a means for alternately connecting an electric load to two sources of electricity;
- an over-the-center spring mechanism operatively coupled to said connecting means, said spring mechanism having a first position at which the load is connected to one of the sources and a second position at which the load is connected to the other source;
- a shaft having a cam which engages the spring mechanism to drive it between the first and second positions, and having a ratchet wheel attached thereto;
- a pawl for rotating the ratchet wheel and said shaft;
- and
- means for driving said pawl.
A switch comprising:
- a means for alternately connecting an electric load to two sources of electricity;
- an over-the-center spring mechanism operatively coupled to said connecting means, said spring mechanism having a first position at which the load is connected to one of the sources and a second position at which the load is connected to the other source;
- and
- means for driving the over-the-center spring mechanism alternatively toward each of the first and second positions, including a solenoid and a manually operable handle assembly.
Dependencies are inferred from the claim text.