US1835870A

US1835870A - Electromagnetic field generator

Info

Publication number: US1835870A
Application number: US443793A
Authority: US
Inventors: Franklin M Henry
Original assignee: Individual
Current assignee: Individual
Priority date: 1930-04-12
Filing date: 1930-04-12
Publication date: 1931-12-08
Anticipated expiration: 1948-12-08

Description

Dec. 8, 19.31. F, M HENRY 1,835,870

ELECTROMAGNETIC FIELD GENERATOR Filed April l2, 1950 INVENT UR HTTRNE Patented Dec. 8, 1931 PATENT or-Flc FRANKLIN M. HENRY, F SAN FRANCISCO, CALIFORNIA ELECTROMAGNETIC FIELD GENERATOR Application med April 12, 1930. Serial No. 443,793.

My invention relates to ap aratus for producing electromagnetic fiel s and particularly alternating electromagnetic fields adapted for therapeutic use, and which aty the same time may. have many uses other than said therapeutic uses.

One object of my improvement is the provision of a simple andv efficient device of the character mentioned.

Another object is the provision of a core and coil construction which will give a maximum strength of field at a particular point with a minimum temperature change in operation.

Another object is the provision of a device of this character having a maximum strength of field with a minimum weight and size.

Another object is the provision of means whereby major portions of the magnetic flux 20 from the core may be concentrated in desired portions of the pole piece.

A further object is the provision of means for compensating for contractions and expansions of parts of a device of the character mentioned.

A still further object is the provision of a novel means for connecting an electrical power supply to a coil of the character referred to.

Other objects and advantages will be apparent during the course of the following def scription.

In the accompanying drawings forming a part of this specification and in which like 5 numerals are employed to designate like parts throughout the same,

Figure 1 is a diagrammatic view of the core andv electrical circuit arrangement embodying one form of my invention.

Figure 2 is a vertical cross section of one form of my device, and diagrammatcally illustrating the wiring arrangement.

Figure 3 is a top plan view of Figure 2.

Figure 4 is a fragmentary sectional view of the spool end.

Figure 5 is a horizontal cross section on line 5-5 of Figure 2.

Figure 6 is a horizontal cross section taken r on line 6 6 of Figure 2, and

Figure 7 is a fragmentary side elevation of the lower end portion of m device.

In the accompanying rawings wherein for the purpose of illustration is shown a prey fer-red embodiment of my invention, there is shown a layer wound coil 5 properly insulated from and disposed on a suitable core with an exposed pole piece at one end, said pole piece servin to facilitate directing an electromagnetic eld to a desired position for use.

Y I preferably `provide a laminated core madeup of elongated sheets 10 as illustrated, or in any conventional manner. Each lamination 10 is provided with a portion 11 disposed at an angle to the part 10 and adjacent a pole piece 12. An important feature of my improvement is the disposition of the core lamination parts 1l with respect to the pole iece 12. The parts 1l may be bent Ysharp y and arranged substantially parallel to the adjacent surface of pole piece 12, or bent at a greater angle to the parts 1() and engage the pole piece 12 nearer the lateral edges of the latter. The core laminations are illustrated with the portions 11 of the laminations divided into two groups and directed in opposite directions, but these parts 11 may be divided into as many groups as may be desired and disposed in as many directions.

The parts 11 serve as means for directing major portions of the flux from the core to desired portions of the pole piece. When the parts 11 are bent sharply with little space .13 at the center of the core, as in Figure 2, the flux will be directed more strongly toward the central portion of the pole piece 12 and when the parts 1l are disposed less acutely the parts 11 facilitate directing most of the f* flux to edge portions of the pole piece 12,

see Figure l.

The portions 11 of the core may be secured vto the pole piece 12 in any desired manner.

.I have illustrated in Figure 7 convenient Vmeans by providing two screws 14 which extend through an adjacent spool end 15 and threaded into pole piece 12 so that the parts l1 are held firmly against pole piece 12.

The spool upon which the wire coil is mounted may be formed in any desirable manner, but I prefer to make this spool np of two

end pieces

15 and 16 with a tubular member 17 joining the two spool ends. The ends 15 and is of an insulating material, such asvulcanized fibre, or the like. On this spool-islwound winding may be arranged in the Conventional Vor any desired manner to provide means for i producing the electromagnetic luXY in the core when an electric current is conducted through the wire of the coil. This coil is designated by the numeral 19 and it isdiagrammatically shown in the drawing. At the end of the spool 15 whichis adjacent pole piece 12,1 preferably provide a thin insulation disc 2O to insure electrical insulation between the lend of the coil 19V and the Yheads of screws 14.

The spool end 16 isthreaded to receive two yscrews 21, which pass through a block 22 with the heads of screws 21 countersunk into block 22 as-clearly illustrated in Figures 2 and 5.

This provides a means for securing block `22 to spool end 16. 'A block 23 of ldisc form rests against block 22 and is held securely thereto by two screws 24. f The screws 24 also pass throughportions of the connectormemployed wherever it is desired for the purpose of giving therapeutic treatment.

It is to be understood that the form of my invention herewith shown and -described isto be taken as a preferred example of the same and that various changes relative to the material, size, shape, `and arrangement of parts may be resortedto without departing from the spirit of the invention or the scope ofthe sub'oined claim. a plurality of layers ofinsulated wire. VThis Y aving thus far described my invention, I claim ln a devicepofthe character mentioned, a spool having cylindrical ends, a block secured v.tol'saidspooleend and narrower inone direction than said spool, a-blocl ot substantially f the diameter of said spoolend secured to the iirst mentioned block, there being openings in said spool end and block, and a coil of wire on saidspool with end portions vdisposed in jacent edges of the rst mentioned block disposed in loops.

in testimony whereof I ailiX my siffnature.

"bers 25. The connector members 25 Varev prefi 'erably set ina recess 26 so thatthe bend in portions thereof and the heads orF screws 24 Vare Vbelow the outer surface of number 23.

Perforations 27 are-provided through thev spool end 16 and disc 23 to conduct the ends ofthe-wire in coil 19 out to the connector by means of screws 28. The members 25 are adapted to connect with connector plugs, proi curable in the open market andrnot illustrated. i

' The block 22 is of discV form except for cut away portions at opposite sides, providing recesses 22in whichvend'portions19 of the wire of coil '19 are disposed in loopsso ,that if a wire end becomes broken at a screw 128 some of portion 19 may be pulled outand secured under the screw 28 again.

' I provide a resilient covering 29 around the coil` V19 and insidev ofa tubular casingl which surrounds all the rparts except Apole ypiece 12. This covering prevents the parts" from becoming noisy` due to expansions and -cross section to till the 'space between the coil 19 and casing 31 in the manner described. l

The tubular-covering 31 surroundsthe coil covering 29. and has one of its ends abutting `pole piece 12. The oppositeend Yof covering 5 31 is secured to disc' 23 `as by screws 32.

.' This completes the unit which maybe em- 'i i' Y v, e5 said openings with portions of the wire ad