US1248461A

US1248461A - Electromagnetic device.

Info

Publication number: US1248461A
Application number: US13187416A
Authority: US
Inventors: Gustavus C Crawford
Original assignee: Western Electric Co Inc
Current assignee: AT&T Corp
Priority date: 1916-11-17
Filing date: 1916-11-17
Publication date: 1917-12-04
Anticipated expiration: 1934-12-04

Description

G. C. CRAWFDRE. sucmommuenc DEVICE.

APPLICATION FILED NOV. 17. 1916.

1,248,461.. v Patented 1m. 4,1911

UN ITED STATES PATENT OFFICE. ousrnvns o. oiaawronn cr .EAs r onancn, Niaw nssrenon TO wEsTEitN ELECTRIC. COMPANY, INCOBPQBATED, NEW YORK, N. Y., A CORPORATION OF NEW YORK.

To all whom it may comm.-

Be it known that I, G-nsravos C. CRAW- noun, a subject of the King of Great Britain, residing at East Orange, in the county of Essex and State of New Jerse T have invent- 3 ed certain new and usefullmprovements in Electromagnetic Devices, of which the following is a full, clear, concise, and exact description. v p

This invention relates to electromagnetic devices and more particularly .to such devices commonly known as interrupters or pole changers. v I j The object of this invention is the production of a devise of compact structure and etficient operation which will also possess the features of simplicity, accessibility and ease of adjustment only to be found previously in bulky and inefficient devices. This object has been attained by the, use of a flat type magnetic structure hereinafter more specifically to be described.

In the accompanying drawing isshown one embodiment of this invention, wherein Figure 1 a plan of an interrupter made up in accordance with this invention; Fig. 2 is a side elevation with part of the base removed to show more clearly the core structure; and Fig. 3 is a cross section on the line 3 3 showing the contact points, contact springs and the vibrating armature. 7

Corresponding parts are designated by the same reference numerals throughout the drawing.

Referring now to the drawing, there are mounted on the wooden base 5, two

fiat cores

6, 6 held together at one end by the magnetic yoke 7. At the opposite end they are secured to the base 5 by screws 8, indicated by dotted lines. Energizing

windings

9, 9 are provided for each core. The armature and armature mounting consists of an inverted L-shaped member 10 adjustably secured to a yoke 7 by means of screws 11, 11, a ribbon-like spring 12, a straight bar 13 and a cross bar 14. The flexible spring 12, while holding the armature in operative relation to the free end ,ofthe cores, allows the straight bar of the armature with its accompanying cross bar to vibrate in a direction transverse to the plane of the fiat cores. The separation between the cross bar of the armature and the free ends of the cores depends upon the relative position of the yoke 7 and the inverted L-shaped member 10, which as herennnornonaennrrc DEVICE.

Specification of Letters Patent.

i atented Dec. 4,

Ap iicaaonineaitdveihter 17, 1916. Serial No. 131,874.

inbetore mentioned, is adjustable. As shown in Fig. 2, the screws 11, 11 pass through slots in the yoke 7, thereby enabling the in verted L shaped member-10 to be moved in a direction transverse to the plane of the hat cores and to be clamped in any desired position.

Under operating conditions, the circuit of the energizing or

motor magnet windings

9, 9 is controlledby an interrupter contact 15 and an interrupter spring 16. The contact 15 is secured to, but insulated from the L-shaped member 10 by means of screws 17 17 and suitable insulating plates and bushings. Accommodated in a threaded hole at the treeend of contact 15 is an adjusting screw 18 carrying a contact point. Posi tioned I for engagement with this contact point and mounted on the armature is the interrupter spring 16, which intermittently engages the contact point of adjusting screw 18 as the armature vibrates. In operation, the vibration er the armature is caused by the intermittent energization of the

motor magnets

9, 9 whose circuit is intermittently opened by the disengagement of contact spring'16 and the contact point oiadjusting screw 18.

Mounted on the free end of the straight bar, of the armature are the contact springs 19 which have intermittent engagement with the contact points 20 when the armature is vibrating. The contact points 20 are adjustably positioned to engage the springs 19 by means of the adjusting screws 21 mounted in threaded holes of the contact members .22. Contact members 22 are secured tothe base by means of screws 23, as indicated by dotted lines. The period of vibration of the armature is adjustable within lllll'ltQlOY means of the weights 24, 2 As shown in the drawing, the contact springs 19 are insulated from the armature 13 but this is not essential to the invention.

It will beseen that the shape of the magnetic circuit not only makes the device highly eflicient, since practically a closed magnetic circuit is thereby obtained, but it also allows of a very compact structure, due to the fact that the armature lies in a plane parallel to that of the core. This feature of compactness is especially important in the class of service for which this device is primarily adapted, namely, telephone exchange systems. In the present state of developllt ment of the telephone art, the amount of apparatus required to meet service conditions has so enormously increased that any reduction in the space required for a given piece of apparatus, providing it does not decrease its efficiency, accessibility or other desirable features, is of the greatest importance. This invention, therefore, is of double importance since it not only provides a device of smaller dimensions than any previously known but in doing so increases the efficiency of the apparatus by the shape of the magnetic structure employed.

The embodiment of the invention shown in the drawing has been found to give satisfactory service and represents the preferred embodiment of the invention, but it is, of course, clear that many modifications of the exact structure are possible.

What is claimed is:

1. In an electromagnetic device, a magnetic structure comprising a plurality of flat cores, a magnetic yoke secured to the cores, an armature flexibly secured to the yoke and in operative relation to the cores, a plurality of energizing windings for the cores, a contact member secured to the yoke, a contact spring mounted on the armature, said contact spring adapted to be intermit tently disengaged from said contact member upon the vibration of the armature.

2. In an electromagnetic device, a plurality of eleetromagnets having fiat cores, a magnetic yoke secured to one end of said cores to hold them substantially parallel, a magnetic L-shaped member secured to said yoke, an armature flexibly secured to said L-shaped member, a contact point in sub stantially fixed relation to said L-shaped member, and a contact spring carried by the armature and adapted to be intermittently disengaged from said contact point upon the vibration of the armature.

3. In an electromagnetic device, a plurality of flat magnetic cores, a magnetic yoke to secure the cores near one end, an armature, a magnetic crossbar secured to the armature adjacent to the free ends of the cores and adapted to move in a direction transverse to the plane of the cores, an ad justable means for flexibly securing the armature to the yoke eomprisin an L-shaped member having one limb adapted to bear against the yoke and adjustably secured thereto, and a ribbon-like spring secured to the armature and to the other limb of the L-shaped member.

4. In an interrupter, a plurality of electromagnets having fiat cores, a magnetic yoke connecting said cores near one end, a magnetic L-shaped member adjustably secured to the yoke, an armature, a ribbon-like spring for attaching said armature to said L-shaped member, a cross member secured to said armature in operative relation to the unconnected ends of the cores, an adjustable contact member secured to, but insulated from, the L-shaped member, and a contact spring carried on the armature adapted to engage said contact member when the electromagnets are deenergized.

5. In a pole changer, a plurality of electromagnets having substantially parallel flat cores, a magnetic yoke, said cores being connected near one end by said yoke, an armature flexibly secured to the yoke and positioned in operative relation to the unconnected ends of the cores and adapted to vibrate in a direction transverse to the plane of said cores, a plurality of relatively fixed contact members, and a plurality of contact springs secured to the armature for intermittently engaging said relatively fixed contact members upon the vibration of the armature.

6. In a pole changer, an insulating base, a plurality of substantially parallel magnetic cores mounted thereon, a plurality of energizing windings for the cores, an armature, means to flexibly secure the armature to one end of the cores, an extension for the armature, a contact member secured to the base, and a contact spring mounted on the armature extension adapted to intermittently engage said contact member when the armature is vibrated.

7 In a pole changer, an insulating base, a plurality of electromagnets having flat cores secured to said base, a magnetic yoke secured to one end of the cores, an armature flexibly mounted on the yoke and adapted to vibrate in a direction transverse to the plane of the cores, an extension for the armature, a plurality of contact springs mounted on the armature extension but insulated therefrom, a terminal member mounted on the base, said terminal member having a plurality of contact points, one of said contact springs being adapted to engage one of the contact points when the armature is moved toward the cores, and another of said contact springs adapted to engage another of the contact points when the armature is moved away from the cores.

In witness whereof, I hereunto subscribe my name this 16th day of November A. D.,

GUSTAVUS C. CRAWFORD.

7 Copies of this potent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G.