Insulated switch arrangement for electric motor

In an electric motor assembly which includes a rotor, a structure for concentrating a magnetic field delivering energy to said rotor, a switch for supplying electrical power to said motor and having electrical terminals, an electrical winding on said structure and responsive to said electrical power for inducing said magnetic field, and a contact element included in said switch for selectively conductively bridging said terminals, the improvement comprising:

• an insulated carrier on said contact element for enabling movement of said element into and out of bridging connection;
• an insulated housing receptive of said carrier and fixedly related to said winding;
• means for effecting an hermetic sealing entirely of said winding and said housing;
• means for moving said carrier to effect movement of said element;
• means defining a bore within said rotor and having circumferentially-spaced longitudinal lugs projecting radially inward thereof;
• a cylindrical bearing member in said assembly and having circumferentially-spaced longitudinal ribs projecting radially outward thereof;
• and said lugs and ribs interfitting circumferentially and being of a radial extent enabling a secure press fit of said bearing member within said bore.

In an electric motor assembly which includes a rotor, a structure for concentrating a magnetic field delivering energy to said rotor, a switch for supplying electrical power to said motor and having electrical terminals, an electrical winding on said structure and responsive to said electrical power for inducing said magnetic field, and a contact element included in said switch for selectively conductively bridging said terminals, the improvement comprising:

• an insulated carrier of said contact element for enabling movement of said element into and out of bridging connection;
• an insulated housing receptive of said carrier and fixedly related to said winding;
• means for effecting an hermetic sealing entirely of said winding and said housing;
• means for moving said carrier to effect movement of said element;
• an enclosure within the interior of which said motor, housing and carrier are disposed;
• means within one wall of said enclosure defining an opening;
• a switch lever mounted within said enclosure and having a lever arm projecting through said opening;
• coupling means transmitting deflection of said switch lever into movement of said carrier;
• a pinion on said switch lever and included in said coupling means;
• a rigid carriage mounted to move in the direction of said carrier and having one end coupled to an exposed portion of said carrier;
• and a rack formed on said carriage and engaged with said pinion.

In an electric motor assembly which includes a rotor, a structure for concentrating a magnetic field delivering energy to said rotor, a switch for supplying electrical power to said motor and having electrical terminals, an electrical winding on said structure and responsive to said electrical power for inducing said magnetic field, and a contact element included in said switch for selectively conductively bridging said terminals, the improvement comprising:

• an insulated carrier of said contact element for enabling movement of said element into and out of bridging connection;
• an insulated housing receptive of said carrier and fixedly related to said winding;
• means for effecting an hermetic sealing entirely of said winding and said housing;
• means for moving said carrier to effect movement of said element;
• an enclosure within the interior of which said motor, housing and carrier are disposed;
• means within one wall of said enclosure defining an opening;
• a switch lever mounted within said enclosure and having a lever arm projecting through said opening;
• coupling means transmitting deflection of said switch lever into movement of said carrier;
• and a rocking arm having first, second and third pivot means, said first pivot means enabling rocking of said arm, said second pivot means coupled to said switch lever to effect rocking of said arm in response to movement of said lever and said third pivot means coupled to an exposed portion of said carrier to effect movement of the latter upon the occurrence of said rocking.