The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 22, 1990
Filed:
Jan. 23, 1989
Duane R Nolte, Wausau, WI (US);
Marathon Electric Mfg. Corp., Wausau, WI (US);
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.