US 2415688 A
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Feb. 11, 1947. Wv C' HALL, JR 2,415,688
INDUCTION DEVICE Filed May 5, 1945 2 Sheets-Shevefl l Feb. 11, 1947. W Q HALL1 JR 2,415,688 Y INDUCTION DEVICE Filed May 5, 1943 2 Sheets-Sheet 2 INVENTOR M/YLLAPD C. HHLL,I7T.
ATTORNEY Patented Feb. 11, 1947 INDUCTION Device Willard C. Hall, Jr., Los Angeles, Calif., assignor to Mrs. Helen J. Hall, Jr., Los Angeles, Calif.
Application May 5, 1943, Serial No. 485,727
This invention was conceived to eliminate the need for cords, wires and the like from portable electrical devices and appliances suchY as lighting devices, hand irons, percolators, waiile irons, mixers, chafing dishes, juice extractors, radios, ctc. Cords, as now commonly used for electrically connecting such portable devices to wall and iioor receptacles and sockets, have long been. a nuisance, iire hazard, dangerous and an unsightly necessity in homes, restaurants, workshops and other places where portable electrical devices have been needed. It is a purpose of this invention to obviatel such cords and wires whereverpossible.
The aims of this invention are accomplished by utilizing electrical induction means, that is, to provide one or more substantially fixed primary transformer elements or induction outlets which are concealed or nearly concealed in the walls, oors, ceilings, cabinets or other fixtures of buildings or outdoor locations, and tov provide a complementary receiver or transformer secondary unit or units designed to be placed in the eld of the primary transformer outlet so that electrical energy can readily be utilized without the aid of cords or wires between the outlet and the secondary units.
This invention is especially useful when combined with ironing boards and the like since it is readily apparent that an ironer can do much better and quicker work when there is no cord dangling from the iron, and also due to the lack of cord, troubles such as shorts caused by wear thereof and also attachment plug breakages. Therefore, work stoppages and delays caused by these cord faults' are eliminated.
One of the principal objects of this invention is to present a cordless and wireless means for transferring electrical power from iixed outlets to power receivers, such means being sturdy and simple in construction and economical to make and use.
Another object is to provide all kinds of portable electrical devices with cordless and wireless electrical connection to a supply of electrical power without resorting to any physical connecting means or complicated non-physical connecting means.
Other objects, advantages and features of my invention will appear from the accompanying drawings, the subjoined detailed description, the preamble of these speciiications and the appended claims.
Applicant is about to illustrate and describe one of the forms of his invention in order to teach one how to make and use the same, but it is to be understood that the drawings and description thereof are not to limit the .invention in any sense whatsoever, except, as limited by the appended claims.
In the drawings:
Fig. 1 shows in elevation, an electric hand iron, parts being broken away to show some parts in detail.
Fig. 2 is a horizontal section taken substantially along the line 2-2 of Fig. l.
Fig, 3 is a vertical section taken substantial- 1y along the line 3--3 of Fig. 1.
Fig. 4 is an elevational view showing various appliances that can be used with thisV invention.
Fig, 5 is an elevational view of a liquid mixer using the invention.
Fig. 6 is an elevation of an electrical motor device using the invention.
The numeral I indicates a hand iron in general having the non-magnetic metal base shoe 2, metal base shell 3, handle grip 4 of insulating material, and its supporting frame 5. The shoe of the iron is recessed to accommodate a heating element E which is a triangular form of mica upon which is wound a resistor 'I in wire form having the ends 8 and v9.
The hand iron is shown as resting upon a non-magnetic metal plate I0 which is countersunk into the top surface of an ironing board I I. The plate lil has a recessed area 2 which provides a well marked receiver for proper positioning of the iron.
Electrical energy is supplied to the iron by a half transformer section I 3, which is the primary portion thereof, and which isV positioned within the cavity I4 of the ironing board. Within the shell 3 ofthe iron, is a half transformer section I5, which is the secondary portion thereof, and which is positioned at the heel part of the iron and fixed to the shoe thereof in any convenient manner, as by bolts. This secondary portion or element' and the primary portion or element form a complete transformer unit, the two cornplementa-ry parts being adapted for electrical coupling and uncoupling with respect to each other.
The secondary portion is formed of an E laminated core stack having the central leg I6 and end legs il and I8; the leg i6 having a coil with the insulated wire ends 20 and 22 thereof connected to one side 23 of a switch 24 in the handle 4 of the iron. and to the heating element end wire 9 respectively. The other side 25 of the switch is connected to the other heating element Wire end 8 by the insulated wire 2l. The entire E core andcoil thereof are. encased in a mica insulating shell 26.
The switch 24 in the handle is in an elongated cavity 2 with end flanges 28 and 29' as shown. In this cavity is a iinger bar Sii adapted to be lifted by the fingers of the iron-er when the iron is to be removed from the stand or plate. ill. By breaking the secondary circuit, and the primary circuit, as well as providing shaded poles for the primary, there is very V`little magnetism to retard free removal of the. iron from the plate 3 I0. 'I'he switch point 25 is xed to an insulated arm that is attached to the rear upward support of the frame 5, and the other switch point 23 has an arm that is fixed to the top of the switch lever or bar 30. Pockets 3l and 32 in the handle l house compression springs 33 which press against the top of the switch bar to continuously urge the bar downwardly and keep the switch points 23 and 25 in contact when the bar is not lifted. To limit the downward position of the bar, the bar has on each end a tongue 34 which engage the stops or flanges 23 and 29 of the handle.`
The primary I3 of the transformer is also an E core or laminated stack having the central leg 35 with a pair of primary coils 33 and 31 which are arranged in parallel, the coil Sii having about twice the number of turns of coil 31. One end of each of the coils 33 and 31 are connected to a lead 38 which connects with the house side of the toggle double pole switch 49. The other end of the coil 36 connects with one end of the coil of the relay 39 and the other end of the relay coil leads to house side of the switch 49. The outer end of the outer winding 31 connects with the relay stationary contact point 35. The other end of the outer coil is connected to the wire 33. The other contact point 4I of the relay is supported by the spring arm @2, this arm 92 being sprung to automatically open contacts 39 and il when the relay coil is not fully energized. The arm is xed to a side wall oi the cavity It and is made of spring steel. The point il connects with a curled exible wire i3 that connects with wire it through the thermostat 135. This thermostat operates to out out coil 31 when the temperature of the chamber I4 becomes too hot or rises above a predetermined temperature, which is a temperature regulation means for the hand iron. This thermostat may be placed in contact with the plate I3 if desired. The double pole switch is connected to a source of suitable electric current by the insulated wires 43 and 43.
The, outer legs 59 and 50 of the E core have a closed winding of few turns I and 52 respectively which shade these poles and aid in the removal of the iron from the plate l0. These shading poles substantially remove alternating current chatter and noise between the iron I and plate I0. The high reluctance bridge pieces 53 and 59 with insulating gap pieces 55 are provided between the tops of the outer transformer legs and the central leg to maintain a shortened path of weak flux when the primary relay switch is open so that the main flux will quickly build up when the iron is placed on the stand l0. y
When the hand iron is lifted by the handle Il, the bar opens the secondary circuit which in turn reduces the current in the primary circuits. This drop in current in the low-current coil occurs also in solenoid 38 (which is in series therewith) and causes opening of switch 38-39, thus breaking the circuit of the high-current primary coil 31. zero, making it much easier to remove the hand iron from the stand or plate I9. This hand iron form of the invention is designed for the usual house lighting cycle circuit of 115 volts; the coil 31 being designed to carry 6 amps., the coil 36 about 1/2 amp., and the coil I9 to provide about 600 watts to the-heating element 1. l
In Fig. 4 of the drawings, isv shown a table top 51 having installed therein spaced apart primary units I3. Over one of the primary units is a p ercolator 58, over another unit atoaster 59,- and over still another unit a grill $0. Each one of- 'Ihe flux due to coil 31 thus drops tov 4 the portable appliances, percolator, toaster and grill, has a secondary unit I5 which supplies the current to the heating element and/or elements of the appliance.
Fig. 5 shows a liquid mixer 5I for drinks and the like resting upon the table top 62 and which haVe the matched transformer units I3 and l5 for supplying current to operate the motor 63 of the mixer.
Fig. 6 shows a bench top 64 with a power motor 65 mounted thereon, the motor having a grinding stone 66 and a saw blade or wheel 61 on the shaft thereof and a transformer unit I5 and the bench a transformer unit I3. Obviously, the invention can readily be applied to all kinds of portable electric appliances including table. and floor lamps, vacuum cleaners, room heaters, etc.
Having thus described my invention, what is claimed as new and desired to be secured by Letters Patent is:
l. An electrical ironing device comprising an appliance with a handle having a switch therein and a stationary current supply station adapted to be placed near where the appliance is to be used, the appliance and the station having complementary transformer parts adapted to be substantially alined for interchange of energy, each transformer part including a core stack with a coil thereon, a heating element in the appliance,
the coil of the appliance having connection with the element for supplying it with electrical energy, the coil of the station having connection with a source of current supply, current breaker means in the station to materially reduce the flux in its core stack, the current breaker means being operated by current drop in the coil of the station when the switch of the handle is opened by lifting the handle.
2. An electrical ironing board device comprising an ironing appliance and a supply station for energizing the appliance, depressed means for positioning the appliance over the supply station, the appliance and the station having complementary parte of a transformer which are properly alined by said depressed means, the complementary parts of the transformer each including a core with a coil thereon, the coil of one core being connected to the current utilization portion of the appliance and the coil of the other core having' connection with a source of current supply, `cur.
other of the parallel coils when the ilux through the relay coil is at a predetermined density.l
.s vvvlninnp o. HALL, Je.
REFERENCES CITED The following references are of record 'in' the file of this patent:
v UNITED STATES PATENTS Number