US2503484A - Electromagnetic switch assembly - Google Patents

Description

April 11, 1950 H, HAWTHQRN' ET AL 2,503,484

ELECTROMAGNETIC SWITCH ASSEMBLY Filed Oct. 13,1944

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Germond,

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Patented Apr. 11, 1950 UNITED STATES PATENT OFFICE ELECTROMAGNETIC SWITCH ASSEMBLY Harold L. Hawthorn and Edward M. Germond, Goshen, Ind., assignors to Penn Electric Switch 00., Goshen, Ind., a corporation of Iowa Application October 13, 1944, Serial No. 558,568

7 Claims. 1

Our present invention relates to a relay structure which is compact in design and simple to fabricate from a plurality of parts stacked together and supported on a bracket or the like.

One object of the invention is to provide a relay which may be readily assembled from a plurality of parts including a stack of insulation spacers with switch blades supported between the spacers and core plates supported on the tops of the stacks so that one set of screws can be used for assembling all of the foregoing parts in rigid relation to each other.

Another object is to provide an armature for attraction by the core plate which is pivotally mounted on the screws and which cooperates with the core plate and the contacts to be attracted by the one when the coil is energized and to operate the other for circuit controlling purposes.

A further object is to provide an arrangement of relay on a supporting bracket which includes a stop plate for the armature also supported on the same screws and rigidly mounted with respect to the bracket by means of interposing spacer sleeves or bushings between the stop plate and the core plate, with the armature pivoted on the spacer bushings.

With these and other objects in view, our invention consists in the construction, arrangement and combination of the various parts of our device whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in our claims and illustrated in the accompanying drawings wherein:

Fig. 1 is a plan view of a relay structure embodying our invention and showing a heavy duty relay and a light duty relay in the same assembly and thereby adapted particularly for oil burner control installations:

Fig. 2 is a side elevation thereof;

Fig. 3 is an end elevation;

Fig. 4 is a horizontal sectional view on the line 4-4 of Fig. 2;

Fig. 5 is a vertical sectional view on the line 5-5 of Fig. 1;

Figs. 6 and '7 are enlargements of the portions of Fig. 4 shown within the circles 6 and I, respectively, thereof; and

Fig. 8 is a sectional view on the line 8-8 of Fig. 7.

On the accompanying drawings we have used the reference numeral [0 to indicate a bracket, of which there are two. Each bracket ID has a horizontal flange l2 provided with a pair of upstanding perforated mounting ears M. The brackets l0 extend upwardly from the flange l2 2 and are provided with vertical supporting flanges I6 directed toward each other, as shown in Fig. 1.

Insulation sleeves l8 extend through the supporting flanges l6, and stacks of insulation spacers 20 are mounted thereon. At the ends of the stacks core plates C and C' are mounted, and beyond these plates are stop plates S and S. Interposed between the plates C and S and the plates C and S are spacer bushings 22 and 24, the bushings 22 being threaded. B lts 26 are screwed into the bushings 22 after passing successively through the stop plate S, the spacer bushing 24, the core plate C, the insulation sleeve l8 and the core plate 0, as shown in Figs. 4, 6 and 7. The stop plates S are secured against the bushings 22 by short screws 28.

Included in the stacks of insulation are four stationary switch blades 30 and four movable switch blades 32. To prevent the stacks of insulation from rotating, other screws 34 and insulation sleeves 36 similar to the sleeves l8 are provided, the screws 34 passing through the core plate C, the insulation sleeve 36. and threaded into the core plate C, as shown in Fig. 2.

Each core plate is inverted T-shape, having a vertical leg 38, as indicated in Fig. 3, and a pair of horizontal arms at its lower end, indicated at 40. A second vertical leg 42 is provided, and its lower end terminates as indicated at 44, and is riveted to the core plate by a rivet 46.

The core plate C, it will be noted, is thicker than the core plate C, as it is for heavier duty, and may be forked at its upper end with a copper shading ring 48 mounted thereon, as shown in Fig. l, for minimizing A. C. hum.

Armatures A and A are provided, and each is inverted U-shape, having a cross-member 50 at the top and a pair of legs 52. The armatures A and A are similar except for thickness, and the two legs are provided with enlarged openings 54 surrounding the spacer bushings 22 and 24. The lower ends of the legs 52 are slightly curved, as shown in Fig. 8, so that they can remain engaged with the core plates C and C due to magnetic attraction, and yet rock thereon to give the desired pivotal action to the armature. In the case of the heavy duty armature A, it is preferable to include a spring 56 to prevent undesired vibration, although we have not found this necessary on the armature A. The cross-piece 50 of the armature is adapted for attraction by the upper and of the core plate leg 38, the two being shown spaced from each other in Figs. 1 and 2 and engaged with each other in Fig. 5.

Relay coils R and R are mounted on the cores C and C and supported thereby. These coils have supply wires 58 extending thereto, and the wires extend upwardly through the space between the insulation spacers as shown in Fig. 4. The switch blades 30 and 32 have terminal cars 60 extending therefrom to which soldered connections, as desired, may be made.

The stop plates S and S are each U-shape, having a horizontal cross-bar 62 at the bottom and upstanding arms 64, as shown in Fig. 3. The upstanding arms are adapted to be engaged by the armatures A and A when the coils R. and R are de-energized, whereupon the movable switch blades tend to separate or engage the relay contacts, as the case may be. When the coils are energized the operation of the contacts is then reversed. The cross-bars of the legs are provided with insulation studs 65 to engage the movable switch blades 32 when the relay coils are energized.

From the foregoing specification it will be obvious that we have provided a simple supporting arrangement for all the parts of the relay on the same screws which extend through the stacks of insulation spacers. The core plates for the relay coils are mounted on this stack and so are the stop plates for the armatures, while the armatures themselves are pivotally mounted on the same screws by the use of spacer bushings which prevent any binding of the armatures at their pivoted ends. The assembly of the parts of the relay is quite simple and involves but a minimum of expenditure of time.

Some changes may be made in the construction and arrangement of the parts of our device without departing from the real spirit and purpose of our invention, and it is our intention to cover by our claims any modified forms of structure or use of mechanical equivalents which may be reasonably included within their scope without sacrificing any of the advantages thereof.

We claim as our invention:

1. In a relay structure, a bracket having'a pair of supporting flanges, stacks of insulation spacers on said flanges, screws through the spacers and flanges to retain the spacers supported on the flanges, contact springs mounted in said stacks and having fixed and movable blades, a core plate at the top of said stacks and supported on said screws, a relay coil mounted on said core plate,

a U-shaped armature having the ends of its arms adjacent one end of said coil against said core plate in face-to-face relation and its cross piece adjacent said core plate at the other end of said coil for attraction thereby, said armature being loosely mounted on said screws for pivotal movement, and a stop for said armature held in rigid assembled relation to said supporting flange by said screws.

2. In a relay structure, a pair of brackets each having a supporting flange, stacks of insulation spacers on said flanges, screws through the spacers and flanges to retain the spacers supported on the flanges, contact springs mounted in said stacks and having fixed and movable blades, a core plate at the top of said stacks and supported on said screws, a relay coil mounted on said core plate, and an armature having one end face-to-face against the mounted portion of said core plate and its opposite end adjacent the outer end of said core plate for attraction thereby, said armature being loosely mounted on said screws for pivotal movement.

3. In a relay structure, a support, stacks of insulation spacers on said support, screws through the spacers to retain them in supported position, contact springs mounted in said stacks and having fixed and movable blades, a core plate included in said stacks and supported on said screws, a relay coil mounted on said core plate, an armature for engaging said movable blades, having its face at one end held resiliently against the face of said core plate and its face at the opposite end adjacent the face of said core plate for attraction thereby, spacer bushings through said armature and located on said screws, said armature being loosely mounted for pivoted action on said spacer bushings, and a stop for said armature against said spacer bushings and held in rigid assembly together with said stacks oi spacers in relation to said support by said screws.

4. In a relay structure of the character disclosed, an element having supporting flanges, stacks of insulation spacers aaginst said flanges, relay contact springs mounted in said stacks and including fixed and movable blades, screws for supporting said stacks of spacers on said flanges, a core plate mounted on said screws, a spacer bushing on said screws, an armature having openings loosely surrounding said spacer bushings and said armature adjacent said bushings being curved whereby the armature may pivot relative thereto, said armature having a portion for attraction by said core plate and being engageable with said movable contact blade to 0perate the same, and a relay coil on said core plate.

5. A relay structure comprising a bracket, stacks of insulation spacers thereagainst, contact blades mounted in said stacks, a core plate against said stacks, screws for retaining said core plate, contacts and spacers mounted on said bracket and rigidly assembled relative thereto, spacer sleeves on said screws, an armature having enlarged openings receiving said spacer sleeves for permitting pivotal movement of the armature relative to the sleeves, springs surrounding said sleeves to take up lost play of the armature and bias one of its faces to engage a face of said core plate, and a relay coil on said core plate, said armature being attractable by said core plate when said coil is energized and engageable with said contact blades to operate the same.

6. A relay structure comprising a bracket, stacks of insulation spacers thereagainst, contact blades mounted in said stacks, a core plate, screws for retaining said contacts, a core plate and spacers mounted on said bracket and in rigid assembly relative thereto, an armature havin enlarged openings receiving said screws with said armature in face-to-face relation to said core plate, said enlarged openings and screws permitting pivotal movement of the armature relative to the screws, and a relay coil on said core plate, said armature being attractable by said core plate when said coil is energized and engageable with said contact blades to operate the same.

7. In a relay, a support, stacks of insulation spacers secured to said support, contactor blades mounted in said stack of spacers, screws extending through the spacers and blades for retaining them assembled on said support, a core plate supported on said screws against said stack of spacers, a coil wound on said core plate, an armature cooperating with said core plate for attraction thereby when said coil is energized and for engagement with said blades to operate them, spacer sleeves on-said screws against said core plate, said sleeves being slightly longer than the '5 s am thickness of said armature and said algp ature having openings receiving said sleeves ,gwith a face of said armature against a face of said bore plate, which openings are slightly larger than the diameter of said sleeves, and springonesaid spacer sleeves to bias said armature a ainst said core plate. 3 HAROLD L. HAWTBORN. EDWARD M. GERMOND.

REFERENCES CITED UNITED sings PKI'ENTS Number Name" Date Johnson Jan. 8, 1929 Mace May 29, 1934 Miller Sept. 11, 1934 Henderson et a1. Feb. 12, 1935 Miller Oct. 19, 1937 Dubuar Nov. 15, 1938 Swenson Nov. 7, 1939 Brown Apr. 16, 1940 Shapiro Jan. 19, 1943

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