US1639258A

US1639258A - Electrical device and the manufacture thereof

Info

Publication number: US1639258A
Application number: US731970A
Authority: US
Inventors: Joseph H Cohen
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-08-14
Filing date: 1924-08-14
Publication date: 1927-08-16
Anticipated expiration: 1944-08-16

Description

Patented Aug. 16, 1927. y

UNITED STATES PATENT OFFICE.

JOSEPH H. COHEN,.OF IIBRIDGEPORT, CONNECTICUT.

ELECTRICAL DEVICE AND THE MANUFACTURE THEREOF.

Application led August 14, 1924. Serial No. 731,970.

This invention relates to electrical devices' and in the form herein disclosed as exemplary of the invention, it is shown as applied to heating units for cigar-lighters such as are used in motor vehicles for the convenience of the driver and other occupants of the car.

Some of the objects of this invention' are to simplify the construction of such devices, io reduce their cost of manufacture and to increase their eiiiciency. y

Other objects will hereinafter appear.

In the accompanying drawings which show one form of the invention, that at present preferred, v l

, Figure 1 is a longitudinalrsectional view of a heating unit made in accordance with this invention, showing the parts thereof in assembled relation.

Fig. 2 is an elevation showing one of the solderless terminals of the heating unit shown in Fig. 1.

Fig. 3 is an elevation showing. the heat-ing element shown in Fig. 1, as it is made and before it is assembled with the other parts of the heating units.'v i Fig. 4 isa top plan unit shown in Fig. 1.

The heating unit shown inthe accompanying drawings may comprise a base'll of lava or other suitable material, having at its lower end a projection 12 adapted to pass through an aperature 1 3 provided in a ferrule 14: which is adapted to encircle the lower end of base 11 and, `when the parts are assembled, to be beaded over a shoulder 15 provided on the base 11 for this sole purpose by providing a circumferential groove 16 in the side of the base.

The upper or top portion 17 of the base 11 may, if desired, be recessed to provide .a pocket 18 for entirely or partially receiving the heating element or translating device which is preferably in the form of high resistance wire. A

When the heating unit is to be used in motor vehicles or other places where the source view of the receiving of current is relatively low, approximatelyand usually six volts, it is possible to provide the resistance' in such form as to be located entirely on the top 17 within an area substantially equal to the cross-sectional area of an ordinary cigar, and this may be done without necessitating the use of especially fine wire and without the use of extraneous resistance means to cut down the voltage. In

such cases the resistance element or Atranslating device is preferably made in the form of a flat or conical spiral adapted to lie in the pocket 18 at the top of the base 11.

However, in some motor vehicles, the ignition and lighting systems utilize batteries of higher voltage, usually twelve volts. For use in such systems, it has been necessary to provide additional resistance wire or material in the circuit in series with the heating ortranslating elements to cut down the current to approximately six voltsacross the terminals of the heatingelements. The extra resistances used resulted in a direct loss of power, for the heat generated by it served no useful purpose. In some cases the extra resistance Wire had the disadvantageous effect of heating the adjacent parts, particularly 1dwhere the adjacent parts were hand- To avoid these disadvantagearto increase the efficiency of the heating unit, and to reduce the cost of manufacture, the present invention provides a heating element for twelve voltage storage batteries in which no extraneous or separate resistance means is used otherbthan the means which produces heat for the purpose of lighting the cigar.

One Way of accomplishing this is shown in .the accompanying drawing in which the heating or vtranslatingv element comprises a fiat spiral portion 19 and a helical portion 2O preferably made integral and wound on .a suitable form in a single operation. The helical portion 20 may be concentric with the spiral ortion 19 if desired, or, it maybe eccentrically arranged. But, in order that the heat of the helical portion 2O may be used to assist in igniting a cigar, the helical portion 20 is located within the zone defined by the outermost convolution of the spiral portion 19 which should conne an area substantially equal to that of the crosssectional area of an ordinary cigar.

To receive the helical portion 20, the base lliis provided with a cylindrical pocket 21 communicating with the pocket 18, its top portion 17 so that while the spiral portion 19 of the heating wire lies in the pocket 18, the

helical portion 20 may extend'into the cylindrical pocket 21, in this case extending down through the center of the body 11. The heat generated by the helical portion 2O thus `passes through the cylindrical pocket 21 to the end 17 of the body and with the heat produced by Athe spiral portion 19 acts to -non 19. i

"By making the helical portion co-axial with the spiral portion .19 thev operation'of winding the heating unit is greatly facilitated. According to the preferred method, first the helical portion 20 is wound upon a cylindrical core until the proper amount of wire is utilized and then the feed is stopped and the winding is continued so that the wire winds in the form of a spiral.

It should be noted that the portion 19 on the resistance wire may be other than spiral, if desired. In case ot such other shapes, however, the resistance is made to lie substantially iiat, and the plane in which it lies is preferably perpendicular to the axis of the helical-portion 20. l l

In vaddition to having thespiral portion 19 and the helical portion 20, the resistance wire is provided with a terminal 22 bent down from the outermost end of the spiral 19, and a terminal 23 provided at the free end of the helical 'portion 20. These

terminals

22 and 23 are preferably provided as straight wires,'as shown in Fig. 3, so that when the heating element is assembled with the base 11, the terminal 22 may pass through a longitudinal wire-clearance opening 24 lprovided at the body 11 and extend-` ing through its other end, and so that wire 23 ymay pass through a central openlng 25 provided in the projection 12 and communieating with the pocket 21.

Heretofore, the terminal 22 coming 4from the outer convolution of the spiral 19 was adapted to pass through a perforation in the ferrule 14 so that it could be soldered to the external sizev of the latter, an operation which materially added to the cost of producing the device.

To avoid the necessity ot'k soldering the terminal 22 to the ferrule 14 Lthe end ofthe terminal 22 is, according to 'the present invention, bent upwardly around the body 11, as shown in Fig. 1, Apreferably with its end extending into the circumferential groove 16.

After the terminal 22 is bent into this position, the ferrule 14 which is then slid over the end of the body 11 has its end beadedover into the circumferential groove 16. This beading operation securely clinches the end of the terminal 22 to the terrule and makes a good permanent electrical contact therewith. l

To provide a solderless connection for the terminal 23 of resistance wire, a metal plug '27 having a cylindrical portion 28 adapted to be inserted in the opening 25 in the body 11,.is provided with a wire-clearance passage 29 through which lthe terminal 23 is adapted to loosely pass. In assembling the device, the plug 27 is placed in the opening 25 so that `the terminal 23 extends through it and then pressure isbroughtito bea- Aon the head 30 of the plug 27 so as to defofrxn` the head .and wim-passage 29 and Cause'v it to securely clinch the wire of the terminal 23, as shown at 31, Fig. 1. The end of the wire protruding beyond the plug 27 is then cut-off in any suitable way.

The ferrule 14 may be provided with screw-threads so as to fit a screw-threaded socket or, as shown, it may be provided with pins 32 by means of which the heating unit may be held in a bayonet-slot type socket.

It should be noted that the method and means for connecting the terminals of the heating element-so as to avoid the use of solder may, of course, be used independently of its particular kind of heating device shown.

Variations and modifications may be made within the scope of this invention and portions of the improvements vmay be used without others.

Having now described the invention, what is claimed'as new, and for which it is desired to obtain Letters Patent, is:

' l. As a new article of manufacture, a heating wire adapted to be inserted as an integral unit in a supporting body of an igniting device, comprising a spiral portion and a helical portion contiguous with the spiral portion, the diameter of the helical portion being substantially less than the diameter of the spiral portion.

2. A heating uni-t comprising a body having a longitudinally disposed pocket therein and in direct communication with one end of the body; and a translating device comprising a high-resistance wire which has a portion formed to lieupon one end of the body and another portion adapted to lie in said pocket, the'heat from saidportion lying in saidpocket rising to the area defined by the portion lying upon one end of the body.-

3. A heating unit comprising a body having a longitudinally disposed pocket therein and in direct communication with one end of the body;and a translating device com.-

prising a high-resistance wire having a substantially fiat, spiral portion adapted to lie upon the end of the body and a helical portion adapted to lie in the pocket, the heat developed by said helical portion rising to the zone defined by said spiral portion.

4. An electrical device comprising a body; a translatingdevice mounted in the body and having terminal. portions; and a contact on the body to receive the other of said terminal portions, the last named contact comprising a metal plug adapted to t within an opening in said body and having a previ., ously prepared `wir,e-clearance passa for said terminal, said plu being adapte to be mechanically deforme to clinch itself to the terminal and make electrical contact therewith.

Cil

body adapted to receive one of lsaid terminall portions/H said contact comprising means adapted to engage a portion of the body and adapted to clinch between the body and itself. in electrical conta'ct therewith, the said terminal portion lof the translating device with which it is related; and another contact in said body comprising a metal plug adapt ed t0 fit Within an opening in the said body and having a previously prepared Wirecleara'nce passage therethrough, said `plug being adapted to be mechanically deformed to confine to itself said terminal portion with whichit is engaged.

6. A terminal member for electrical de# vices, comprising a metal plug having a wire Y,clearance passage therethrough and adapted to fit within an opening in a bodyl portion of electrical devices, sald plug be,`

ing adapted to be deformed to confine to itself, a wire passing through said Wire'clearance passage. f

Signed at Bridgeport, yin the county of Fairfield and State of Connecticut, this 13th day of August, 1924.

' JOSEPH H. COHEN.