US1445897A - Electric heater - Google Patents

Description

Hf. 9 8, 5 4 l TI. 0 0 rr T H G U Nh Feb. 2Q, 1923.

ELECTRIC HEATER.

FILED MAR. 8. 1920.

INVENTO'R ATTORNEY Patented Feb. 20, 1923.

UNITED lSTATES EDWIN N. LIGHTFOOT, OF NEW YORK, N. Y. C0., OF MILWAUKEE. WISCONSIN,

ELECTRIC Application led March 8,

To all 'whom it may concern:

Be it known that I, EDWIN N. LIGH'rroo'r,

a citizen of the United States, residing at New York, in the county of Bronx and 6 State of New York, have invented new and useful Improvements in Electric Heaters, of

which the following is a specification.

This invention rela-tes to electric heaters. More particularly it relates to flat electric heaters in which the resistor is enclosed by and insulated from a sheet metal armor. One of the objects of this invention is to provide a simple, compact and durable terminal of a minimum number ofparts for use in heaters of this type. y

Another object is to provide a terminal which may be assembled with the other elements of the heater in such manner that the entire assembled heater may be compressed in the usual manner without taking special precautions to protect the terminal.

Another object is to provide a terminall which in being attached to the heater requires a minimum number of operations.

Another object is tov provide a terminal to which the resistor may be directly connected.

Another object is to vprovide an improved heater the parts of which may be easily and 30 quickly assembled.

Another object is to provide an improved heater wherein during the assembly thereof the possibility of disarrangement of parts is reduced to a minimum. I

Another object is to provide an improved heater wherein the terminal and its support are insulated from the heater casing.

Another object is to provide a terminal y which when mounted onthe heater, permits the heater to be mounted upon a support with the heater either parallel with or at an angle thereto.

Another object is to provide a terminal Which may form part or all of one of the reenforcing plates of a flat heater.

Other objects and advantages of this invention will appear from the following specification.

Several embodiments of this invention are illustrated in the accompanying drawings,

in which Fig. 1 is a perspective of a fiat heater equipped with a terminal.

PATENT OFFICE.

, ASSIGNOR T0 THE CUTLER-HAMMER MFG.

A CORPORATION OF WISCONSIN.

HEATER. i

1920. serial No. 364,128.

Fig. 2 is a vertical section of the heater on line 2 2 of Fig. 1.

Fig. 3 is a plan of the heater with portions broken away to show the resistor connected with the terminal.

Fig. 4 is an end elevation of the heater.

Fig. 5 is a plan of a terminal blank.

Fig. 6 is a vertical section through an eX- panded terminal.

Fig. 7 is a top plan of a modified form of t-he terminal wherein the two terminals of the heater form the upper reenforcing plate thereof.

Fig. 8 is a vertical section on line 8 8 of F ig. 7. A

Referring to Figs. 1 to 4 of the drawings, the heater here shown comprises a sheet metri plate 10 having anges folded over a sheet metal plate 14 to form an enclosure for a suitable resistor 12 wound about a core 13 of insulation. The resistor 12 is insulated from the plates 10 and 14 by means yof insulating strips 11 and 15.

The heater is provided with terminals 2O positioned at each end thereof. The terminal 20 comprises a flatbase 21 and a perforated extension 22. The terminal is punched from sheet metal of a thickness preferably not greater than the thickness of the plate 14.

lVhen assembling the heater with its terminals. the ends of the resistor are extended through openings 24 in insulating strips 23. One insulating strip 23'is then placed at each end of the heater. with an edge thereof overlapping the end of the insulating strip 15. The blank terminals are then placed on top of the insulating strips 23 With the extensions 22 extending beyond the ends of the heater. Each insulating strip 23 is of sufficient length to permit the ends thereof to be folded over to insulate the' base'21 from the folded over flanges of the plate 10. lVhen thus assembled extension 22 of each terminal is in the same` plane as the base 21 thereof. so that the entire structure may be compressed to definitely position the elements thereof in their proper relation, and to produce a thin heater. During `this compressing Operation. no special precautions need be taken to protect the terminals since they are flat and do not project beyond the surface of the reenforcing plates.

, bent to lie in a pla-ne perpendicular to the plate; in fact, withvthis form of terminal, the perforated extension may be positioned at any desired angle to the heater.

ligs. and 8 show a modified form of the heater in which the base 21 of the terminal is made of suficient length to form the upper reenforcing plate taking the place of the plate 14. shown in lFigs. 1 to 4. The insulating strip separating the base of these two terminals from the resistor is also of suicient width to fold over and insulate the base of the terminals from the flanges of the lower reenforcing plate 10. rllhe bases of the two terminals are insulated from each other by being spaced apart.

llt is to be understood that the drawings and the description thereof are to be interpreted in an illustrative sense and not a limiting sense for its is obvious that the invention may be embodied in other structures than those illustrated.

What is claimed is,

1. A heater having in combination a resistor` an armor enclosing the resistor. insulating strips separating the resistor'and the armor, a terminal of single ply material having a base insulated from and rigidly held by the armor and an extension extending from the base, and means for connecting the resistor to the extension of the terminal.

2. A heater having in combination an insulating strip, a resistor thereon, an armor enclosing the resistor and insulating strip throughout their length, insulating strips separating the resistor and the armor, and a terminal having a base rigidly held by integral portions of the armor but insulated therefrom, the terminal also having means for clamping the resistor thereto. Y

3. A heater having in combination a resistor, an armor enclosing the resistor. insulating strips separating the resistor and the armor, a terminal having a base insulated from and rigidly held by the armor, a perfora'ted extension carried by the base, and a clamping member extending through' the perforation to engage and clamp the resistor to the extension.

4. A heater having in combination a resistor, an armor enclosing the resistor, insulating strips separatingthe resistor and the armor, a terminal having a base insulated from and supported by the armor, a perforated extension extending from the base, and a rivet extending through the perforation to engage and clamp the resistor to the extension.

5. A heater having in combination a resistor, an armor enclosing the resistor, and insulating strips separating the resistor and the armor, a terminal having a base insulated from and firmly held by the armor, a perforated extension extending from the base, and a hollow rivet extending through the perforation to clamp the resistor to the terminal and serving as a point of connection for an electric conductor.

6. A terminal for electrical apparatus comprising a Hat base forsecuring the terminal to the electrical apparatus, an extension carried by the base, and having a peerforation therein, and connecting means for connecting an electric conductor of the apparatus with the periphery of the perforation. f

7. A terminal for electrical apparatus comprising a fiat base by means of which the terminal is mounted upon the electrical apparatus, an extension extending from the base, said extension being df reduced width and having an opening therein, and a clamping member for clamping an electric conductor of the apparatus to the periphery of the opening.

.8. A terminal for electrical apparatus comprising a fiat base by means of which the terminal is mounted upon the electrical apparatus. a perforated extension for the base, a resistor, and a hollow rivet extending through the perforated extension to clamp the resistor thereto.

9. A heater having in combination a resistor, insulating strips, a pair of sheet metal plates, one plate having flanges; folded over the other to form an enclosure for the resistor insulated from the enclosure by the insulating strips, a terminal having al fiat base insulated from and clamped in the enclosure by the flanges, an extension for the base of the terminal, and means for connecting the resistor to the extension.

10. A heater having in combination a resistor, insulating strips, a pair of sheet metal plates. one plate having flanges folded over the other to form an enclosure for the resistor insulated therefrom by the insulating strips, a terminal having a flat base clamped in the enclosure by the flanges, a perforated extension extending from the base, and clamping means cooperating with the perforated extension to clamp the resistor thereto.

11. Aheater having in combination a resistor, insulating strips, two terminals, each having a flat base and an extension therefor, a` sheet metal plate having flanges folded over but insulated from the base of each terminal to form an enclosure for the resistor insulated therefrom by the insulating strips, and means for connecting the resistor to the extension.

12. A heater having in combination a resister, and an armor insulated from and enclosing the resistor, said armor having parts thereof insulated, from the remainder thereof to electrically isolate said parts therefrom, and saidresistor being connected with 10 said insulated parts of the armor.

In Witness whereof, I have hereunto subscribed my name.

EDWIN N. LIGHTFOOT.

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