US1289309A - Regulator. - Google Patents

Description

A. A. TIRRILL. REGULATOR. APPLICATION FILED SEPT. s. 1916.

Patented Dec. 31, 1918.

WITNESSES:

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ALLEN A. TIBRILL, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

REGULATOR.

Specification of Iietters Patent.

- Patented Dec. 31, 1918.

Application filed September 9, 1916. Serial No. 119,274.

citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Regulators,

of which the following is a specification.

My invention relates to electrical regulators of the vibratory-contact type, and it has special reference to the structural features of such regulators whereby their reliability of operation is improved.

The object of my invention is to provide a regulator that shall be positive and accurate in operation and devoid of all inherent mechanical vibrations which may prevent" the main contact members from making firm and positive electrical contact with each other.

My invention is panying drawing, front view of a portion of a regulator em-, bodying a form illustrated in the accomof my invention, and Fig. 2 is a side view showing in detail the mechanical connection between the plunger of the vibrating electromagnet and the lever controlling the movement of the movable main contact member'of the regulator.

The regulator comprises a cast metal base 1 that is provided on its front face with a bracket 2 upon which is ivotally mounted at 3 a bell-crank lever 4. One arm of the lever 4 is substantially horizontaland the other is substantially vertical, the latter being bifurcated at its lower end to provide a pivot at 5 for a second lever 6. A rightanglebracket 7 is secured to thelever 6 adjacent to the pivot 5 and provides a mounting for a movable contact member 8 which constitutes one of the main contact members of the regulator. A second contact member 9, resiliently mounted upon a spring element 10 and a bracket 11 extending from the base plate 1, cooperatively engages with the movable contact member 8.

Engagement and disengagement between the two contact members .is eflfected by means of two alternating current electroma et 12 and 13 the former being known as t e main control magnet and the latter as the vibrating magnet. The electromagnet 12 influences a core member 14 which is attached by means of a rod 14 to one end of the lever 6. A slotted member 15 incloses a projecting end 16 of the lever 6 for limit- Figure 1 of which is a same time, a

ing the rocking moyement of the lever. A dash pot 17 retards the movement of the plunger 14. A counter-weight 18 is suspended by means of a spring element 19 from the other end of the lever 6.

The electromagnet 13 which is continuously subjected to increasing and decreasing excitations, in a well known manner which is common in all forms of regulators of this type, influences a plunger 20 that is connected by means of a stem 21 and a mechanism 22 g to the horizontal arm of the bell-crank lever 4. A dash pot 23 retards the movement of "the plunger 20. A counter-weight 24 sus pended by a non-extensible element 25 is also attached to the extremity of the horizontal arm of the'bell-crank lever 4. The regulator shown in Fig. 1 is "fully and completely described in my copending application Serial No. 119,870, filed Sept. 13, 1916.

The present invention relates to the mechanism 22 which is interposed "between the plunger 20 of the vibrating electromagnet 13 and the levers controlling the engagement and disengagement of the main contact members 8 and 9 of the regulator. With the stem 21 extending directly between the lunger 20 and the lever 4, as in regulators eretofore constructed, a very pronounced vibration was transmitted to the lever 4 by reason of the alternating current impulses imparted by buzz was produced at the pin pivotally connecting the stem 21 to the lever. This vibration and buzz was especially noticea ble when the regulator was subjected to normal excitation since'the core 20 substantially floated, by reason of the balancing action between the core and counter-wieghts. This vibration decreased the firmness of conthe electromagnet 13. At the tact between the main contact members, and

in order to insure a more definite and firm engagement between the main contactmem bers and conseguently improve the reliability of operation 0 the regulator, the mechanism 22 is rovided.

By referring to that the stem 21 is Fig. 2, it will be noted firmly secured to a link 26, secured to the horizontal arm of the lever.

ing current regulators because of the light tension that the spring 27 exerts upon a pin 28 that, in turn, is the attaching means for the end of the lever 4 by means of the nonextensible element 25. If the counter-Weight 24 were suspended by means of a spring, as

has heretofore been the usual practice, the vibration imparted to the lever 4 would be very much increased instead of reduced since the mechanism 22 and a spring element for attaching the counter-weight 24 would form a mechanical structure that would tend to resonate.

While I have described, in detail, one embodimentv of my invention, it will be understood that many modifications may be made therein without departing from the spirit and scope of the appended claims.

I claim as my invention:

-1. An electrical regulator of the vibratorycontact type comprising a lever, a vibrating electromagnet having a plunger, a relatively heavy spring element, and a relatively light spring element located beside the heavy spring element and co-extensive therewith for connecting said plunger t the lever.

2. An electrical regulator comprising a lever, a movable contact member controlled thereby, a cooperating stationary contact member, a vibrating electromagnet, a plunger therefor, and spring elements of different sizes for attaching said plunger to said lever. I

3.- An electrical regulator comprising a lever, a movable contact member controlled thereby, a cooperating stationary contact member, an alternating current electromagnet, a plunger therefor, and means forsecurproper times firmly engage with ing said plunger to said lever for eflecting engagement and disengagement between the said contact members, said means comprising heavy and relatively light spring elements for absorbing all vibrations imparted to said,- plunger whereby firm contact may be established between said contact members.

4. An electrical regulator comprising a lever, a contact member controlled thereby, a cooperating stationary contact member, an alternating current vibrating electroinagnet, a plunger therefor, and heavy and relatively light spring elements for securing the plunger to the end of said lever.

5. An electrical regulator of the vibratingcontact type comprising a lever, an alternating current electromagnet, a plunger therefor, a relatively strong spring element for attaching said plunger adjacent to one end of said lever, and two relatively light spring elements disposed on opposite sides of said first spring element and co-extensive therewith;

6. An electrical regulator of the vibratingcontact type comprising a lever, an alternating current electromagnet, a plunger.

therefor, a relatively strong spring element for attaching said plunger adjacent to one end of said lever, two relatively light spring elements disposed on opposite sides of said first spring element and co-extensive therewith, and a counter-weight attached to the extremity of said lever adjacent to said spring elements.

7 An electrical regulator of the vibratingcontact type comprising a lever, an alternating current electromagnet, a plunger 90 v therefor, a relatively strong spring element for attaching said plunger adjacent to one end of said lever, two relatively light spring elements disposed on opposite sides of said first spring elementand co-extensive therewith, and a counter-weight attached. to the one extremity of said lever by means of a non-extensible member.

In testimony whereof, I have hereunto subscribed my name this 23d day of August,

ALLEN A. TIRRILL.

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