Centrifugal actuator switch with a limiter for spring movement

Patent metadata

Field	Value
Publication number	US-9734969-B2
Application number	US-201414270627-A
Country	US
Kind code	B2
Filing date	May 6, 2014
Priority date	May 6, 2014
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A centrifugal actuator switch includes a sleeve having a collar on which two protuberances are formed. Each protuberance engages a biasing member to limit movement of the biasing member when weighted lever arms of the switch are extended by centrifugal force as they rotate at a predetermined rotational speed.

First claim

The invention claimed is:

1. A centrifugal actuator switch comprising:
a sleeve configured for axial movement about an output shaft of an electrical motor, the sleeve having a first end and a second end with a cylindrical bore extending from the first end of the sleeve to the second end of the sleeve;
a collar positioned about one end of the sleeve;
a pair of weighted lever arms pivotally mounted on diametrically opposed sides of the sleeve;
a pair of biasing members, each biasing member being operatively connected between the lever arms on diametrically opposed sides of the sleeve; and
a pair of protuberances, each protuberance being a flattened hemisphere that extends from a surface of the collar, each protuberance being positioned on diametrically opposed sides of the sleeve to enable each protuberance to engage one of the biasing members in response to the sleeve moving in response to the weighted lever arms pivoting about the sleeve as the output shaft rotates at a first predetermined speed.

2. The centrifugal switch actuator of claim 1 wherein the biasing members are springs.

3. The centrifugal switch actuator of claim 1 wherein the collar and the sleeve are integrally formed together.

4. The centrifugal switch actuator of claim 3 wherein the integrally formed collar and sleeve are an injection molded component.

5. An electrical motor comprising:
an output shaft;
a rotor mounted about the output shaft; and
a centrifugal actuator switch including:
a sleeve configured for axial movement about the output shaft of the electrical motor, the sleeve having a first end and a second end with a cylindrical bore extending from the first end of the sleeve to the second end of the sleeve;
a collar positioned about one end of the sleeve;
a pair of weighted lever arms pivotally mounted on diametrically opposed sides of the sleeve;
a pair of biasing members, each biasing member being operatively connected between the weighted lever arms on diametrically opposed sides of the sleeve; and
a pair of protuberances, each protuberance being a flattened hemisphere that extends from a surface of the collar, each protuberance being positioned on diametrically opposed sides of the sleeve to enable each protuberance to engage one of the biasing members in response to the sleeve moving in response to the weighted arms pivoting about the sleeve as the output shaft rotates at a first predetermined speed.

6. The electrical motor of claim 5 wherein the biasing members are springs.

7. The electrical motor of claim 5 wherein the collar and the sleeve are integrally formed together.

8. The electrical motor of claim 7 wherein the integrally formed collar and sleeve are an injection molded component.

Assignees

• Nidec Motor Corp

Inventors

• Wehrheim Robert

Classifications

• H01H35/10 Primary

  Centrifugal switches (level of mercury displaced by centrifugal action H01H29/26) · CPC title

• H02K11/23

  Mechanically-actuated centrifugal switches · CPC title

• H02K11/0036

  Electricity · mapped topic