US1463005A

US1463005A - Heating unit

Info

Publication number: US1463005A
Application number: US512080A
Authority: US
Inventors: William H Dalton
Original assignee: Individual
Current assignee: Individual
Priority date: 1921-11-01
Filing date: 1921-11-01
Publication date: 1923-07-24
Anticipated expiration: 1940-07-24

Description

July 24, 1923.. 1,463,005

W. H. DAL-[ON HEATING UNIT Filed Nov. l, 1921 2 Sheets-Sheet l @A e. n

Invenor.

Wiiliam H. Dclhon byfmm w Anya.

July 24, 1923. 1,463,005

W. H. DALTON HEATING UNIT Filed NOV. l, 1921 2 Sheets-Sheef, 2

Inventor. William H. Dol'ron Patented July 24, 1923.

PATENT OFFICE.

WILLIAM H. DAILOIN',V @F SALEM, MASSACHUSETTS.'

HEATEENG UNIT.

Application filed November To aZZfww/m. t may concern.' z

Be it known that I, WILLLAM H. DALTON, a citizen of the United States, and resident of Salem, county of Essex, State of Massachusetts, have invented an Improvement in Heating Units, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

rlhis invention relates to electric heating units and particularly to heating units et that type which are inthe form of an elongated cylinder.

@ne of the objects of the invention is to provide a novel heating unit et this type which contains no metal except resistance wire so that the unit will heat metallic parts without danger of short-circuiting the heating current.

Another object of the invention is to provide a heating unit of this type in which the heating coil 1s connected to the lead wires without the use of binding screws or other metallic elements and in such a way that the coils themselves are entirely relieved of any strain to which the lead wires may be subjected.

Another object of the invention is to provide an improved heating unit which is so constructed that the heating coils may be either connected up in series or in parallel or in other ways to provide a unit or" the wattage desire.

Other objects otI the invention are to provide an improved heating unit which has various other advantages all as will be more itully hereinafter set forth.

lin order to give an understanding of the invention l have illustrated in the drawings some selected embodiments lthereof which will now be described after which the novel features will be pointed out in the appended claims.

, Fig. l is a longitudinal sectional view of the shell or holder ot my improved heating unit.

Fig. 2 is a perspective view ot the shell.

Fig. 8 is-.an end view..

Fig. 4 shows the heating coil as it is prepared for introduction into the shell.

Figs. 5 and 6 show the manner in which the heating coil is electrically connected to the lead wires and the latter connected to il, 1921. Serial No. 512,680.

the shell in making up a heating unit having the lead wires extending from opposite ends thereof.

lligs. 7 and 8 show the manner in which these operations are carried out in making a heating unit in which the lead wires extend from the same end.

Fig. 9 shows an embodiment of the invenipn where the coils are arranged in paral- Fig. l shows an embodiment of the invention where two or more heating units are arranged in tandem.

My improved heating unit comprises a shell or holder l which is preferably cylindrical in shape, although the exact shape is not essential to the invention. This shell or holder l is made oi material which has insulating properties and which is also highly refractory and is a conductor of heat. rlhe shell l is provided with one or more longitudinal bores 2 extending from one end to the other thereof and in which the heating coils may be placed. rllhe shell is also provided with a recess 3 at each end with'which the bores 2 communicate, each recess having a sufficient diameter so that all the bores 2 may open thereinto. The formation ot this recess provides a iiange portion 4 at each end of the shell which constitutes the wall oiC the recess.

ln the construction illustrated the shell is provided with four coil-receiving bores 2 although the number is immaterial so 'far as the invention is concerned and may be varied without departing therefrom.

rlhe heating coil ot the unit is indicated at and the lead wires at 6. 'lhe bores 2 are utilized both for securing the lead wires to the shell l and tor the reception of the heatinO' coil or coils 5.

ln order that the heating coils 5 may function properly it is essential that the turns thereof should be correctly spaced and to provide for maintaining this spacing both while the coils are being introduced into the bores and while the unit is being used l propose to provide a strand-receiving member which extends thevlength of the coil and which takes any longitudinal strand thereor". This strand-receiving member is shown at 7 and may be in the form of a cordl or dexible connection preferably of insulating `opposite ends of the same bore.

material and which is connected at its ends to the ends of the coil as shown at 8. With this arrangement any longitudinal strain will be taken by the member 7A and not by the coil. f

In assembling the coil 5, lead wires 6 and shell l to make a complete unit I propose to first anchor the end of the lead wires in one or more of the bores 2 and then to draw the coil through another bore or bores and subsequently connect the ends of the coils to the leadwires.

Figs. 5 and 6 show how this may be done in the case of a unit where the lead wires extend from opposite ends thereof. The lead wires 6 are shown as stranded wires, preferably untwisted stranded wires, and

"one end 9 of each wire is inserted into the end of one ofthe bores 2, as shown in Fig. 5. If the lead wires extend from opposite ends of the unit then the two ends 9 of the lead wires may beinserted into These lead wires are anchored in the bore in some suitable way as for instance by filling the latter with cement 10 and in order to make a good connection the end of each lead wire may be bent or shaped to form an enlarged' portion 11. The ends of the lead wires are separated from each other so there is no' electrical connection between them. After the lead wires have been thus anchored in the shell 1 then the coil 5 is drawn into another bore as shown in F ig.l 5. The coil is made with straight ends 12 of considerable length and the coil portion thereof will be of a length equal to that of the bore '2. The presence of the connection 7 enables the heating unit to be drawn into the bore Without disturbing the relative position -of the turns of the coil.

After the heating unit has been located in the bore, as shown in Fig. 5, then the ends 12 thereof are twisted with the projecting ends of the lead wires so that a stranded wire is formed in which some of the strands pass into the end 'of a bore and terminate therein and another strand extends through the bore and constitutes the circuit for the heating current. If desired, the strands of the lead wires 6 may be of the same material as that used in the coil 5 or they may be of different material so long as they have proper conducting properties. i

After the ends of the coil have thus been twisted into the strands 6 then suitable insulation 13 is applied to the projecting ends as shown in Fig. 6, the insulation extending clear into the recesses 3. i

A heating unit having this construction has an exterior formed entirely of insulating material so that it can be used in any location and placed in direct contact with any object without danger of short circuiting the heating current. The only metallic portions of the unit are the lead wires 6 and the coil 5 and these are thoroughly protected by insulation.

In Figs. 'T and SVI have shown an embodiment of the invention where both the lead wires extend from the same end of the unit. vThe process of making the unit, however, is substantially as above described. that is, the ends of the untwisted stranded lead wires are inserted into the ends of two bores 2 and secured therein, shown in Fig. 7 and the coil 5 is then drawn through one bore and back through another bore and the ends l2 thereof are then twisted into the lead wires. Insulation is then applied to the twisted wires thus producing a heating unit in which the two lead wires extend from the same end and in which a double heating coil is used with the twol turns thereof in series.

In Fig. 9 I have illustrated an embodiment of the invention in which two coils 5 are used to be arranged in multiple. The construction of Fig. 9 is similar to that shown in Figs. 5 and 6 except that there are two lheating Acoils instead of one and the ends of both coils are twisted into the leadwires 6.

In Fig. 10 I have shown a different ar rangement in which two shells are arranged in tandem from end to end and' in which longer heating coil is drawn through both shells thus producing a heating unit of double length. In other respects the construction shown in Fig. 10 is similar to that above described.

I claim.

1. Av heating coil comprising ar shell of insulating material having a relatively small bore extending from one end to the other thereof, a heating coil within said bore, a lead wire connected to each end of the Coil outside the bore, and means other than the coil for anchoring each lead wire to the shell.

2. Ina heating unit, the combination with a shell of insulating material having a bore extending from one end to the other thereof, each end of the shell being provided with a recess with which the bore communicates, of a heating co'il within said bore, a lead wire connected to each end of the coil within one of the recesses, and means other than tnleucoil for anchoring each .lead wire to the s e 3. A heating unit comprising a shell of insulating material having a bore extending from one `end to the other thereof, two lead wires anchored lto the shell, and a heating coil occupying said bore and having each end twisted into an extended portion of one of the lead wires.

4C. A heating unit comprising a shell of insulating material having va bore' extending therethrough, two lead wires anchored to the shell, a heating coil occupying said here and having each end twisted into an extended portion of one of the lead wires, and insulation covering the portions of the lead wires with which the ends of the heating coil are twisted.

5. A heating unit comprising a shell of insulating material having a plurality of hores extending from one end to the other thereof9 'two lead wires each having its end entering and anchored in one of the bores, a heating coil occupying another bore and having its H. DALTON.