US1606138A - Centrifugal governor - Google Patents

Description

Nov. 9,1926. 1,606,138

C. C. BARBER CENTRIFUGAL GOVERNOR Filed June 27, 1921 Fiy Patented Nov. 9, 1926.

UNITED STATES 1,606,138 PATENT OFFICE.

CHARLES C. BARBER, OF 'FREEPORT, NEV YORK, ASSIGNOR TO WESTERN ELECTRIC COMPANY, OF NEW YORK, N. Y.,

A CORPORATION OF NEW YORK.

CENTRIFUGAL GOVERNOR.

Application filed June 27, 1921. Serial No. 480,681.

This invention relates to centrifugal controlling devices and is directed more particularly to a centrifugal switch operating mechanism.

I The specific embodiment of the invention described hereinafter is an alarm circuit operating mechanism, the function of which is to indicate abnormally high and low speeds of a rotating shaft. The mechanism comprises a oentrifugally responsive device or governor, and a set of contact springs operable by said governor to close one or the other of two alarm circuits whenever the speed of the shaft goes above or below normal.

The object in view is the provision of simple and effective means for regulating the action of a centrifugal governor over a wide range of speeds, and in accordance with this object the charateriz'ing feature of the invention consists in mounting the retractile springs of the governor on pliable arms which may be bent so as to shift the position of the springs with respect to the pivotal points of the lever arms, thereby varying the moment of resistance to centrifugal force. Not only does this provide a very simple, effective and economical construction, but it insures permanency of regulation as there are no parts which can get out of adjustment of their own accord.

Reference will now be had to the drawing for a more complete description of the invention.

Figure 1 is an elevational view of the alarm mechanism with the casing shown in cross-section Figure 2 is a cross-sectional View along the line "2--2 of Figure 1;

7 And Figure 3 is a cross-sectional view along the line 33 of Figure 2.

To the rotatable spindle 1 there is securely fixed a collar 2. The lever arms 3 are pivotally secured to the collar 2 by .means of pins 4. Lever arms 5 are each pivotally secured to one of the lever arms 3 by means of pin 6, and are also pivotally secured to the bushing 7 by pins 8. The bushing 7 is mounted on the end of spindle 1 and is free to move longitudinally thereon.

To each lever arm 3 there is riveted a pair of angle brackets 9, and the springs 10 are attached to the laterally extending arms of these brackets. The, springs 10 operate to circuit for indicating abnormally high speed restrain the toggles comprising lever arms 3 and 5 against centrifugal force, and when the spindlel is stationary, the toggles are held retracted by said springs, as shown in full lines in Figure 1. When the spindle is rotated, the toggles move outwardly against the tension of springs 10 in response to centrifugal force, as indicated by the dotted outline in Figure 1.

Bushing 7 is moved longitudinally on the spindle in response to the lateral movement of the toggle as will be evident, and accordingly any increase in the speed of spindle 1 W111 cause the movement of bushing 7 to the right, as viewed in Figure 1. Likewise, an decrease in the speed of the spindle wil tlafffict the movement of bushing 7 toward the The operating contact spring 11 is disposed between contact springs 12 and 13. Spring 11 is provided with an insulating stub 14 which is pressed against bushing 7, and spring 11 accordingly follows the longitudinal movement of said bushing.- When the spindle is stationary, or operating below normal speed, contact springs 11 and 12 are engaged as shown in Figure 1, and a suitable alarm circuit for indicating abnormally low speed is closed by the latter? spring.

With the spindle at normal speed, spring 11 is held out of engagement with the contacts of both springs 12 and 13, and when the speed exceeds normal, the contact of spring 11 is brought into engagement with the contact of spring 13. A second alarm is closed through springs 11 and 13.

Angle brackets 9 are made preferably of pliable metal, such as brass, and the laterally extending arms thereof to which retractile springs 10 are attached, are adapted to be bent to permit shifting the positions of springs 10 with respect to the positions-of pivot pins 4. It will be seen that if the angle brackets are bent until the retractile springs are as near as possible to the center of pins 4, the moment of resistance/to centrifugal force will be reduced to a minimum, and if the brackets are bent so as to move the springs away from the center of pins'4, the opposite result will obtain,

The spindle 1 is intended to run at a constant speed. and the governor is adjusted to maintain the contacts between springs 11, 12

' ried and 13 open so long as the speed does not vary more than a small amount either way from normal. 1 a I The governor may be adjusted to maintain the contacts open at an speed over a very wide range by bending the angle brackets as previously describe What is claimed is: p 1. In a centrifugal overnor, a pair of rotatably mounted togg es, a pair of springs, two airs of separately adjustable In S carliy said toggles and normally pro ecting at right angles to the plane of said toggles, each of said springs connecting the free ends of a pair of said lugs, said lugs being ed on a rotata adjustable toward and away from the pivotal points of the to gle.

2. n a centrifugal governor, the combination of a tog) 1e e s aft, a pair of springs, a pair of pliable lugs secured on o posite faces of each toggle, one lug of eac li pair cooperating with the correspondin lug of the other pair to anchor at their ree ends one of sand springs, the position of said springs being adjustable by said lugs in a direction parallel to the anus of the shaft.

In witness whereof, I hereunto subscribe my name this 23rd day of June A. 1)., 1921.

CHARLES C. BARBER.

oint lever system mount-

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