Electricity: circuit makers and breakers – Centrifugal – Liquid contact
Patent
1989-01-23
1990-05-22
Tolin, Gerald P.
Electricity: circuit makers and breakers
Centrifugal
Liquid contact
73538, 2003021, 310 68E, H01H 3510
Patent
active
049279882
ABSTRACT:
A centrifugal switch assembly for a single phase induction motor connects a start winding in circuit to start the motor. A centrifugal actuator positions a movable contact on the end of a cantilevered spring arm relative to an aligned fixed switch carried by an insulating flat plate secured within the motor. A silicone rubber boot in the form of a tubular member has a first heavy end telescoped over the movable contact with a resilient gripping of the side of the contact. The opposite end of the boot is a heavy end which is freely telescoped over the opposite contact into engagement with the flat plate to totally enclose the contacts, but may also be attached to the contact with a resilient grip. The boot has an intermediate convolution between the two ends. The convolution is formed as a very thin wall to establish a highly flexible but supporting wall member. The boot length is greater than the spacing of the open contacts and the convolution is continuously deflected to create a compressive support of the boot between the flat plate and the movable contact. The contacts open to de-energize the circuit during the starting of the motor. The boot may have more than one convolution between the mounting the fixed contact ends. The boot is formed from a special silicone rubber and is specially processed and stored in a sealed enclosure prior to assembly.
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Marathon Electric Mfg. Corp.
Tolin Gerald P.
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