US1767172A - Resistor grid and method of supporting same - Google Patents

Description

June 24, 1930. F. T. COPE 1,767,172

RESISTOR GRID AND METHOD OF SUPPORTING SAME Filed Sept. 17, 1923 2 Sheet-Sheet 1 Patented June 24, 1930 UNITED STATES PATENT OFFICE I'm '1. CORE, SALEM, OHIO, ABBIGNOB TO THE ELECTRIC FURNACE OOKPA'HY,

OI SALEH, OHIO, A CORPORATION 01' OHIO assxsroa em um mrrnon or surronr mo sum Application filed September 17, 1923. Serial Ho. 883,275.

This invention relates to electric furnaces and more particularly to the resistance elements for producing the heat in the furnace and has for its objects to provide a resister grid formed of solid metal of a cross sectional shape to radiate the heat rays into the interior of the furnace at an angle to the furnace wall, and comprising a single bar bent into a plurality ofparallel sections so proportioned as to produce a radiating surface considerably greater than the wall surface covered by the grid, means being rovided for supportmg the grld spaced rom the furnace wall and m a manner to permit expansion and contraction of the grid without allowing the sectlons thereof to move out of their parallel relation to each other. Y I

The above and other objects may be attained by constructing the resistor grid and sup orting means in the manner illustrated in t e accomparyingdrawmgs, in wh1oh- Figure 1 is a ront elevation of a resistor grid embodying the invention, showing the same mounted upon a fragment of furnace wall;

Fig. 2, a section of the grid on the line 22, Fig. 1;

Fig. 3, a section of the grid on the line" 3-3, Fig. 1;

Fig. 4, a section of the grid on the line H, Fig. 1; L

Fig. 5, a transverse sectional view throu h the wall showing an end elevation of t e grid and the terminal thereof;

Fig. 6, a perspective view of the terminal stud' Fig. 7, a front elevation of the terminal;

Fig. 8, a perspective view of one of the su porting hooks;

1g. 9, a similar view of one of the lower spacing hangers; and

Fig. 10, a modified cross section of the r1 I g Similar numerals refer to similar parts throughout the drawings.

A portion of a furnace wall built of refractory brick or the like, is indicated at 1 and the resistor grid is formed of a continuous bar of metal bent at intervals to produce shape of the grid is T-sha ed, as shown,

in Fig. 3, the base 6 having t e inclined side edges 7, while the flange or rib 8 is tapered toward its point which is rounded as at 9.

Or the eneral'cross sectional shape of the grid may e substantially channel sha e, as shown in Fig. 10, the base 6* and the anges or ribs 8 having inclined sides; in either case the grid bar being flanged or ribbed to give it strength and rigidit With this cross sectional s ape, the greater portion of the surface of the grid is located at an angle to the normal plane of the grid, thus radiating the majority of the heat rays into the heating chamber of the furnace at an angle to the furnace wall.

The grid is supported at its upper ed e ortion by the hooks 10 which engage t e attened portions 4 of the grid. Each hook is provided with the flattened shank 11 received in the flat socket 12 formed in the upper edge of the adjacent brick in the refractory wall 1, and depending lugs 13 and 14 are provided at the forward and rear ends of the shank to prevent longitudinfil movement of the shank within the we The depending studs 5 upon the lower ends of the grid bars are extended through the squared apertures 15 formed in the lower supports 16, which are also provided with the fiat shanks 17 received in the notches 18 in the upper faces of the adjacent bricks. A shoulder 19 is formed at the inner end of the shank and a depending lug 20 at the outer end thereof to prevent longitudinal movement of the sup ort in the wall.

Each extremity of t e grid is connected to a terminal stud 21 which is extended through a suitable opening 22 in the brick wall of the furnace, the inner end thereof being provided with the flat head 23 which is welded to the adjacent extremity of the rid. g A terminal 24 is connected to the outer endof each of the terminal studs 21, having the split socket 25 which receives the end of the stud, clamping bolts 26 clamping the same tightly upon the stud. Sockets 27 are formed in the terminal into which the ends of the cables 28 are soldered or otherwise connected.

Owing to the cross sectional shape of the grid and the conformation of the same, the

radiating surface of the grid is equal to possible with the usual-constructions now m use.

As the studs 5 upon the lower ends of the grid bars are extended loosely through the openings 15 in the lower supports, the grid may expand as the temperature of the same is increased, without causing any buckling or warping, since the entire weight of the grid is supported from the upper hooks.

The upper hooks engaging the loops at the upper end of the grid and the lower supports engaging the studs upon the lower ends of the grid bars, prevent lateral distortion of the grid under high temperature, thus preventing adjacent portions of the grid rom comingmto contact with each other when they are expanded by the heat.

Generic claims for the broad inventions and specific claims for the channel shaped grid bar, which are illustrated and described but not claimed here, are made in application Serial N 0. 451,97 6, filed May 13, 1930, as a division of this application.

I claim 1. A grid formed of a bar of substantially T-shaped, cross sectional sha e, bent upon itself to provide a plurality 0 vertical parallel portions connected at alternate ends by curved portions, the curved portions at the up er end of the grid being of substantiall at cross sectional shape and supporting ooks engagmg said upper curved porions.

2. A grid of the character described formed of a bar of substantially T-shape cross section, the side faces thereof being inclined to radiate the major portion of the heat rays away from the base in the direction of the flange side of the bar.

3. In combination with a wall, a resistor including shoulders at each end of the supports for engagement with the surfaces of the wall.

In testimony that. I claim the above, I have hereunto subscribed in name.

FRAN T. COPE.

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