US1403331A - Electric heater - Google Patents

Description

E. N. LIGHTFOOT.

ELECTRIC HEATER.

APPLICATION FILED APR. 9. 1920.

3 SHEETSSHEET I.

. ENVENTOR 1% 1'7? QflOOZ ATTQRNEY' Patented Jan. 16. 1922.

E. N. LIGHTFOOT.

ELECTRIC HEATER.

APPLICATION FILED APR. 9. 1920.

Patented Jm. 10,1922.

3 SHEETSSHEET 2.

ATTORNEY E. LI G HTFOOT. ELECTRIC HEATER. APPLICATION FILED APR. 9, 19:20.

Patented Jan. 10; 1922.

3 $HEETSSHEET 3.

ATTORNEY UNITED srATEs PATENT OFFICE.

nn'wm N. menrroor, or nnwxoax, n. Y.-, nssrenoa To run CUTLER-HAMMER MFG. (70., OF MILWAUKEE,

WISCONSIN, A CORPORATION OI' WISCONSIN.

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Specification 01' Letters Patent.

Application filed April 9, 1920. Serial No. 372,616.

To all wkom'it may concem." v

Be it known that I, EDWIN N. Lren'rroor,

. a citizen of the United States, residing at plate 'with a terminal New York, in the county of Bronx and Stateof New York, have invented new and useful Im rovements in Electric Heaters, of which t e following is a specification.

This invention relates to electric heater.

More particularly this invention relates to a flat electric heater having a resistor enclosed in but insulated from a sheet metal armor.

An object of this invention is to provide a rugged and durable terminal support for such a heater.

Another object is to provide a terminal support which also serves as a support for a cover box for the terminals.

Another object is to provide a terminal support which will facilitate the manuface ture of heaters of which it forms a part.

Another object is to provide a projecting support for fiat heaters on which all or partof the terminals may be mounted.

- Another object is to provide an enclosed terminal support;

Embodiments of this invention are illustrated in the accompanying drawings, in whichi Fig. 1 is a side elevation of a heater provided with a terminal support carrying a terminal insulated fromthe' sup rt.

Fig. 2 is an enlarged longitu inal vertical section through the heater and its terminal support and terminal.

Fig.5 is a plan of a blank terminal support. a

Fig. 4 is a top plan of a heater in which the base of each terminal support form's-a portion of one of the reenforcing plates of the flat heater.

Fig. 5 is a plan of the upper reenforcing support formed integrally therewith and projecting from each end thereof.

Fig. 6 is a. plan of a blank terminal support arranged to carry two terminals.

Fig. 7 is a plan of a blank terminal support provided with a perforated lug for coshown in Fig. 23..

insulating bushing employed to insulate Patented Jan. 10, 1922.

operating with and looking a cover box in position to enclose the terminal.

Fig. 8 is a side elevation of a heater with a cover box enclosing the terminal carried by the terminal support. F1g. 9 is a top plan of the heater shown in-Fig. 8.

Fig. 10 is a top plan of a heater equipped with another form of cover box. I

Fig. 11 is a view of the terminal support employed in the heater shown in Fi 10.

1g. 12 is a vertical section on t e line 12-12 of Fig. 10. f

Fig. 13 is a plan of terminal support for carrymg two terminals. a

Fig. 14 is a perspective of a heater equipped with the terminal support of Fig.

3, and a co-operating cover box. Fig.

four terminals.

Fig. '16 a perspective of a heater irquiplpged w1th the terminal support of mounted upon the terminal supthe resistor has been on Fig. 22 is a' perspective of 'a heater equipped with a terminal support shown inFig.21." w m Fig. 23 's a perspective of a heater shown 15 is a plan of a terminal support- .for carrying p the one terminaland the cover a portion of the box away to show the a terminal support which may be'mounted upon the heater after osed in the armor.

in Fig. 21 equipped with a cover box for the terminals.

Fig. 24 is a perspective of the cover box Fig. 25 is a perspective of atw o piece 1 the electric conductors from the openings support, the support may be left extendthrough which they enter the cover box.

Fig. 26 is a verticalsection of the insulating bushing shown in Fig. 25.

Fig. 27 ,s a front elevation of the insulating bushing shown in Fig. 25.

Fig. 28 is a. perspective of another form of cover box.

Fig. 29 is a front elevation of an insulating bushing for use with the cover box shown in Fig. 28.

' insulating bushing shown in Fig. 30 is a verticaLsection through the Fig. 29.

Fig. 31 is an elevation of the cover box shown in Fig. 30 equipped with. the insulating bushing shown in Figs. 28 and 29.

The heaters shown in the various figures of the drawings are of flat electric heaters.

Fig. 2 shows a heater made up of a resistor 37 wound about a core 38 of insula tion. The resistor 37 is enclosed in a sheet metal armor made upof two reenforcmg plates 35 and 40, the former being provided with flan es folded over the latter. The resistor 37 is insulated from the'enclosin armor by insulating strips 36 and 37 place on opposite sides of the resistor.

for use with 3 shows the form of terminal 'support the heater shown in Figs. 1 and 2. This terminal support'comprises a base 41 and a perforated extension 42.

If the heater is of the type in which the terminal supports are built in, that is, the base of each terminal support is clamped in osition by the flanges of the lower plate, before the flanges of the lower plate 35 are Fig.

, folded over the upper plate 40, then a terminal support (Fig. 3). is placed on top of the insulating strip 39 at each end of the pressure plate 40; The flanges of the lower plate 35 are then folded over the upper plate 40 and the base of each terminal support.

The heaters after being thus formed may be put in a press for compressing them into very compact structures.

After the heater has been compressed a hollow terminal rivet 43 may be mounted upon each terminal support. The periph-' cry of the perforation in the extension 42 is struck up to provide greater separationbetween the terminal support and terminal. An insulating washer 44 placed on one side of the termlnal support 42 insulates the.

resistor 37 and the one .end of the terminal rivet therefrom. Another insulating washer 45 placed upon the other side of the terminal support 42 insulates the other end of the terminal rivet therefrom.- The insulating washers 44 and 45 are clamped in position by expanding the ends of the ter-\ minal rivet over the washers. the end of the resistor 37 being clamped against the washer 44 by and into electrical contact I with the adjacent expanded end of the ter-' minal rivet,

.for carrying the terminals.

When the terminal is mounted upon the ing in the same lane with the enclosing armor or may be ent at an angle thereto. Fig. 4 shows one terminal support havin a long base 50 and another terminal suppor Fig. 6 shows a terminal support having a short base 54 and a projection provided with two perforations 55 in which terminals may be mounted. This terminal support may be employed in a heater the two terminals of which are to be mounted at the same end thereof.

Fig. 7 shows a terminal support havin a short base 56 provided with a perforate extension 57 and a perforated lug 58. This terminal support may be employed where it is desired to enclose the terminals mounted in the perforated extension 57.

Figs. 8 and 9 show a heater equipped with the terminal support shown in Fig. and a cover box 59 enclosing the terminal carried by the support. The cover box is locked in place by a cotter pin 60 extending through the perforated lug 58 protrud ing through a slot in the top of the cover box. An insulated conductor 61 extending through an aperture in the side of the cover box 59 is connected to the terminal. The conductor is clamped against the terminal by a bolt 48 extending through the hollow center of the top of this box and the per-. 'forations 66 permit the positioning of the cover box inany one of eight different po sitions so that the conductor to be connected with the terminal of the heater, may'approach from any desired angle and enter the cover box directly through the aperture in the side thereof: The terminal support employed with the circular cover box of Fig. 10 is shown in detail in Fig. 11. The perforated extension of this terminal support is provided with two short lugs 71 and a longer perforated lug 70. The perforated lug 70 extends through the opening 67 in the top of the cover box and the shorter lugs 71 extend through oppositely positioned perforations 66 in the top of the cover box. The lugs 71 and the re 'steringrforations 66 serve to position t e cover the' cover box to the terminal support. Fig. 13- shows a terminal su port having a base 75 and an extension in w 1ch are provided two perforations 76 for mounting the terminals side ;by side. Two perforated lugs 77 are formed on the perforated extension of the terminal support. Fig. 14 shows a'cover' box 78 employed with a heater equipped with the termlnal support of Fig. 13. Four perforations 79 provided in the top of the box and positioned 90 apart permit the cover box to v be. mounted 111 any one of four positions.

, Provided in. the t The electrical conductors extending through the opening 80 in the side of the box may there ore approach from either end or side of the heater. The cover box is locked in place b cotter pins 60 extending through theper orated lugs 77.

Figs. 15 and 16 show an E shaped terminal support which may be mounted upon the heater after the other elements thereof have 'been assembled and the heater has been compressed. The base 81 of this terminal support rests on top of the upper reenforcing plate 40 while the ends 82 overlie the flanges of the lower reenforcing' plate 35.

The ends 82 are rigidly fastened to the flanges of the lower plate by soldering,-ri'veting,! or spot welding. The extension 83 is perforated for mounting four terminals and is provided with two perforated lugs 84 for mountin the cover box. 'The extension 83 may be nt at right angles to the base 81 before being mounted. upon the heater.

Fig. 17 shows the cover '85 which co-operates with the terminal support shown in Figs. 15 and 16. Openings 87 and 86 are and one side of the cover box so the cori dhctors may enter through either the top or side thereof.

Figs. 18 and 19 show an L shaped insulating plate which fits in the cover box with the bushings 89 registering-with either the perforations 86 .or 87. The insulating strip is held in proper position by the perforated lugs 84 extending throughslots 90or 91.

and the alined slots in the top of thecover ing plate provide additional insulation between the entering conductors and the cover box.

The terminal support in Fi 19 carries ane elet'92 insulated from t e extension 83 o the su port by the insulating washers 45. The en s of theeyelet 92 are expanded over insulating washers 45 to form a seat for arsecond eyelet-94 which clamps the resistor 37 against"the eyelet 92.

Figs. 21'and 22 show a'terminal support having a base 95 the ends of which are struck up slightly for mounting on the flanges of 0x on the heater and cotter pin 60 locksv the lower. reenforcing plate, and an extension 96 carrying oppositel laterally extendmg perforated-ears 97 an a perforated lug 98. The perforations in the ears 97 are to receive terminal eyelets 92 which are'suit ably insulated from the ears by means of insulating washers. The upper reenforcing plate 40 extending beyond the end of the heater is perforated for receiving an insulated eyelet '99 b means of which the heater may be mounted. The resistor. 37 extends through registering apertures in the upper insulating stri and the reenforcing plate 40 to-the terminals.

Fig. 23 shows a terminal cover box locked to theterminal support by a 'cotter pin extending through the perforated lug 98. The opening 100 m the side of the box is provided with a/split insulating bushing 101 for more thoroughly insulating the entering electrical conductor from the cover box. The insulating bushing 101 is shown in detail in Figs. 25, 26 and 27, while the -cover box is shown separately in Fig. 24.

Figs. 29 and 30 show a single piece insulating bushing 105 which may be used with the cover box 106 shown in Fig. 28. On each side of the opening 107, through which the electrical conductors enter the box, a lug 108 is formed to provide means for locking the insulating bushing 105 to the cover box as shown in Fig. 31.

The invention contained .herein is, of course, susceptible of other embodiments and adaptations.

What is claimed is,

1. In an electric heater having a resistor separated from 'an enclosing armor by sul'ating strips, the combination-of a terminal support comprisin a base mounted upon and a terminal connected to the resistor and carried by but insulated from the extension. 2. An electric heater having in combination a resistor, an enclosing/ armor therefor, insulating'strips separating the resistor and the armor, a terminal support having a flat base mounted upon'the armor and provided with an extension, and a terminal connected to the resistorand carried by but insulated from the extension. box. The bushings carried by the insulatlating strips, aiterminal support compr sing a flat base mounted u on the armor and prothe armor and provi ed .with an extenslon,

vided with an extension, and a terminal for the resistor clamped to and insulated from the extension.

.4. An electric heater having in combinationa resistor, an enclosing armor therefor,-

insulating strips separatingthe resistor and the enclosing armor, a terminal support havin a base mounted upon the armor and provi ed with a perforated extension, an insulating washer on each side of the perforatediextension, and a terminal rivetconnected to the resistor and extending through the perforated extension and washers to clamp the same together. v 5. A'heater having in combination a resistor, an armor enclosing the resistor insulating strips separating the resistor rom the armor, a terminal support supported by the armor, a terminal for the resistor insulated from and carried by the terminal support, a cover for enclosing the terminal, and locking means for locking the cover to the terminal su port.

' 6. An electric lieater comp ising a resistor, an enclosing armor therefor, insulating strips separating. the resistor and the armor, a

terminal support having a base supported by the armor and provided with an extension, a lugformed on the extension, a tering strips separating the resistor and theminal for the resistor carried by and'insulated from the extension, a cover for the terminal having an aperture through whlch the;

lugextends, and locking means. engagingthe lug to lock the cover to the support.

7. A'heater having in combmation a re-' sistor, an enclosing armor therefor, insulatarmor, a terminal support having a base supported by the armor and provided with an extension, a lug formed on the extension, a terminal for the resistor carried by and insulated from the extension, and a cover for the terminal having an aperture through a which the lug extends so as to position the cover over the terminal.

.8. A heater comprising a resistor, an enclosing armor therefor, insulating strips separating the resistor and the armor, a terminal support having a base supported by the armor and provided with an extension",- positioning lugs and a perforated lug formed on the extens1on, a terminal for'the resistor .carried by and insulated from the extension,

a cover for. the terminal having apertures with which the positiomng lugs register andan aperture through which the perforated Y lug extends, and a pin extending through the perforated lug so asto lock the cover. to the support.

9. A heater having in combination aterminal sup ort, a terminal insulated from-- and carrie by the supp ort, a cover for the terminal held in position by the terminal support, an electric. conductor connected with the terminal and extending through an opening provided in the cover, an insulating bushing for the opening held in position by .the co-operation of .the cover and the terminal support. p 10. A heater having in combination a terminal support, a terminal insulated. from and carried by the support, a conductorconnected to the terminal, a cover for the terminal having an opening through which the conductor extends, and means for locking the cover to the terminal support.

11. A heater having in combination a. terminal support, a. terminal insulated fromsistor, a pair of plates forming an enclosure for the resistor, insulating strips separating the resistor from the plates, an extension for one of the plates, a terminal for the resistor lnsulated from and carried by the extension,

a lug formed on the extension, and a cover for the'terminal having an aperture with which the lug registers to position the cover.

In witness whereof, I have hereunto subscribed my name. 1

EDWIN N. LIGHTFOOT.

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