US2522269A

US2522269A - Electrical therapeutic device

Info

Publication number: US2522269A
Application number: US36221A
Authority: US
Inventors: Fred J Hart
Original assignee: Individual
Current assignee: Individual
Priority date: 1948-06-30
Filing date: 1948-06-30
Publication date: 1950-09-12
Anticipated expiration: 1967-09-12

Description

Sept. 12, 1950 F. J. HART 2,522,269

ELECTRICAL THERAPEUTIC DEVICE Filed June 30, 1948 35 9 3o %43 B H 33 k M 34 40 I7 /8 6 /4 JL-Zi i INVENTOR. Fred J. Har7 MGGKWK,

Patented Sept. 1950 Fred J. Hart, Salinas, Calif.

Application June 30, 1948, Serial No. 36,221

1 Claim.

My invention relates to improvements in electrical apparatus for producing interrupted alternating magnetic fields for therapeutic uses.

One object is the provision of an electromagnet which, with an alternating current, is adapted to set up electrical currents in human tissues for helping to relieve inflammatory conditions.

Another object is the provision of an electromaget made up of a core of magnetic material and a coil winding on said core with means for automatically making and breaking an electrical current in a recess in said core so that the current will be made and broken in the magnetic field of said electromagnet.

Another object is the provision of simple and efiicient means for accomplishing this end.

Other objects will be apparent from the following description and accompanying drawing, in which:

Figure 1 is a view showing an electromagnet in section and an electrical circuit with the latter mostly in diagram, and

Figure 2 is a diagrammatical view of the electrical circuit.

Referring more particularly to the drawing, the electromagnet of my device preferably has a magnet core made up of a large rear portion 5 and a cylindrical hub portion 6. The magnet may be of any other desired shapes. A 0011 of wire 1 is wound on the hub portion 6 and formed to fit the front surface of the enlarged portion 5 of the core. The ends 8 and 3 of the coil 1 are led to the middle posts l and II of a double pole double throw switch. When the blades} l2 and I3 are connected with the poles l4 and I5 current supply wires l6 and I1 furnish uninterrupted current to coil 1. An "off and on switch l8 controls the supply of alternating current electricity to the device.

A thermal switch is mounted on a. nonconductor block IS in a recess 20 in the front end of the core part 6. The arrangement is such that when the current is chopped with the thermal switch mounted on the underside of the block iii the spark will occur in an electromagnetic field.

The thermal switch consists of a bimetal bar 2| adapted to be bent by heat to open

switch points

22 and 23. A resistance coil 24 is wound on said bar 2| with one end secured to the bar 2|. The

latter bar has one end secured by rivet 25 to block IS. The bar 2| is arranged to hold

points

22 and 23 together normally. Current in the coil 24 heats the bar 2| and moves point 22 away from point 23. When said points separate, the current breaks and coil 24 and bar 2| cool again to repeat the cycle.

Switch point 23 is secured by a rivet 28 to block I9 and connected by wire 21 to switch post i4. The other end of coil 24 is secured to block |9 by rivet 28 and connected through wire 29 to switch post 30.

Rivet 25 is connected by a wire 3| to one end of the primary coil 32 of an air core transformer. The other end of coil 32 is connected by a wire 33' to switch point 34.

A condenser 35 is connected between ends of the primary coil 92 and secondary coil 36. The other end of the secondary coil 36 is connected by wire 31 to a treatment plate 38. The latter is mounted on the front face of a front cover 39 which may be of Bakelite or other non-magnetic material.

Front cover 39 is secured at its periphery to the front edge of the rear brass or other metal casing 49 by rivets 4| or their equivalents. The magnet part 5 is secured to the rear casing by brackets, one of which is shown at 42. The casing may be provided with openings 43 for the circulation of air. Suitable insulation material 44 is placed between thecoil and the core parts 5 and 6.

In operation, when switch :bladesare thrown over to contact with posts 4 and |5, the coil acts continuously and must be operated on alternating current.

When the switch blades l2 and i3 are thrown over to engage

posts

30 and 34, current travels from wire I 6 to wire 21 and through

points

22 and 23 as long as they are closed. While the switch points are closed the heavy part of the current travels over bimetal bar 2| and wire 3| to primary coil 32, then to post 34, blade l2 and over wir 8 to coil 1. The current returns over wire 9 to supply wire H.

A small part of the current branches ofi through heater coil 24 to heat and bend the bimetal bar 2| to open the points. While the points are closed, current returns from coil 24 over wire 29 to switch post 30, then blade l3 to supply wire l1.

An important feature is the electromagnet with one large end and one small one to provide a mor concentrated flux at the small end. Then, cutting the supply current in the small end and in the concentrated field.

I claim:

In an electrical therapeutic device, the combination of an electromagnet having a coil and a core, said core having a cylindrical portion disposed in said coil and an enlarged portion against one end of said coil, said cylindrical core portion having a central recess in its outer end adapted to provide a relatively weak magnetic field over the recess and a strong magnetic field at the eriphery of said end, and an automatically operi5 ated switch in said recess and operatively connected to said coil.

FRED J. HART.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Pignolet Dec. 24, 1940