US1671794A - Resistor and support therefor - Google Patents

Description

May 29, 1928.; 1,671,794 D. L. SUMMEY nEgl sToR AND SUPPORT THEREFOR Filed June 5, 1926 3 Sheets-Sheet l INVENTOR.

ATTORNEW May 29, 1928.

D. L. SUMMEY RESISTOR AND SUPPORT THEREFOR 3 Sheets-Sheet 2 Original Filed June 5, 1926 ATTORNEYS May 29, 1928.

D. L. SUMMEY RESISTOR AND SUPPORT THEREFOR Original Filed June 5, 1926 3 Sheets-Sheet 3 INVENTOR.

A TTORNEYJ'.

Patented May 29, 1928.

UNITED STATES DAVID L. SUMMEY, F WATER BURY, CONNECTICUT.

RESISTOR AND SUPPORT THEREFOR.

Original application filed June 5, 1926, 'Serial No. 113,852. Divided and this application filed latch 26, 1927. Serial No. 178,646.

This invention relates to resistors and supports therefor. The present application is a division from an application filed June 5,

1926, Serial No. 113,852.

6 It is an object of the invention to provide a resistor and resistor supporting means such that the resistors, and particularly those for the bottom of a furnace, may be readily assembled and disassembled with the furnace structure in situ, and such that the furnace Walls give the necessary insulation.

With these general objects, and others, in

View, the invention consists in the features,

combinations, details of construction, and arrangements of parts which will lirst be described in connection with the accompanying drawings and then more particularly pointed out.

In the drawings Figure 1 is a view in longitudinal vertical section of a furnace embodying a resistor and resistor supporting means constructed in accordance with the invention;

Figure 2 is a top plan view of a resistor;

Figure 3 is a sectional view taken on the line 33 of Fig. 2;

Figure 4 is a transversesectional view of the furnace; and, k

Figure 5 is a transverse sectional view of a modified construction.

Referring to the drawings, the furnace illustrated, more or less conventionally, in Figs. 1 and 4 comprises a furnace housing 11, of firebrick or other suitable material,

enclosing a long heating chamber 12. At the ends of the furnace are suitable doors 13, 14. At the bottom of the .furnace chamher is a removable metal floor 15 for supporting the articles to be heated, e. g. trays of small articles, which may be slid across the floor.

The furnace chamber may be heated by top, side and bottom resistor units. Top and side units are disclosed in the parent application above referred to. As the present application relates to so-called bottom resistor units, the top and side units have been omitted for simplicity of description and illustration.

Below 11001 15 are a number of longitudi- 'movable as a unit with the resistor.

nalrecesses or chambers 16 for receiving the resistor units. As here illustrated as an example, there are three of these recesses, each accommodating the units.

Each resistor, as shown, comprises a substantially rigid wire 17 pre-formed into a hairpin bend, the legs of which are helically coiled. The resistors have their legs parallel with floor l5 and extend substantially the length of the furnace chamber.

Resistor 17 has conductor leads rigidly connected with the resistor wire and located at right angles to the axes of the resistor legs. To this end, the two legs of the hairpin loop are extended somewhat beyond the o5 coiled portion and the ends are bent downward. as appears inFig. 1. \Velded to one bent-down end of the resistor wire is a conductor lead 19 in theform of a rigid rod which passes downwardly through a suitable hole orpassage in. the bottom wall of the furnace. The other end of the resistor wire has a similar lead 20. The leads 19, 20, are of larger diameter than the wire 17 to avoid undue heating eli'ect in the wall. Beyond the furnace wall the leads are connected in a suitable electric circuit by being attached to bus bars (not shown).

There is provided a plurality of individual resistors insulated and supported 0 from the bottom wall. In structures embodying the invention to the best adva tage, the supports will be such that the resistor can be assembled and disassembled independently of the furnace structure. This 5 may be accomplished, for example, by supports resting freely on the bottom wall and To this end, in the embodiment. illustrated in Figs.

1 and 2, the resistor 17 is supported by a row of spaced, duplex pillow blocks 25. The blocks have central partitions 26 for separating the legs'of the resistor loop and each side provides a seat for one leg of the coiledresistor, as more clearly appears in Fi s. 3 and 4. 'Blocks 25 are made of firebric or other suitable material and seat freely on the bottom wall of the furnace structure.

The sup orting means includes, in the present em diment, meansforfastening the resistor in position on its supports so that resistor and blocks form a movable unit. To

this end, as here shown as an example, each side of eacli block 25 has a pair of bores for 6 receivin the legs of a wire loop or staple 27 whic embraces one turn of the resistor coil. At the bottom of the blocks, the bores open into countersunk recesses 28. After the staples are in lace, their ends are bentover 10 to prevent wit idrawal the bent ends lying ifn recesses 28 to provide a flush bottom surace.

In normai position the resistor rests on the pillow blocks 25 which are supported from and insulated by the bottom wall of the furnace chamber, The resistor is held in place by'the staples which cannot come out because of their bent ends. The resistor,

its leads, and its supports, form a unit which 2 may be removed or inserted independently of the furnace walls.

To remove this unit, floor 15 is removed and the resistor unit lifted upwardly with aright line movement, thus withdrawing leads 19, 20, from the furnace wall. The

unit may then be removed through an end door. To. assemble the unit, the resistor is stapled to its pillow blocks and the complete unit is lowered with a right line movement until the pillow blocks seat on the bottom of recess 18, the leads being pushed home in their passages. Both operations are carried out with the furnace walls in situ.

Figure 5 illustrates a modification in which bottom resistors may be removed and inserted without the necessity of removing the furnace floor. As here shown as an example, the furnace 30 has a heating chamber 31. Near the bottom of this chamber is a metal floor 32, supporting a plurality of metal channels or trou hs 33. These troughs serve as guides for articles to be heated,e. g.

billets, as they move through the furnace.

Below floor 32 is a recess 34 extending tra'ns versely of the furnace. The bottom resistor 35 is like that above described except that its leads, one of which is indicatedby 36, are coaxial with the resistor coils instead of at right angles. 'The resistor is supported by 59 pillow blocks 37 such as those described and these blocksare supported from the bottom wall by seatin freely thereon. The resistor is stapled to t e blocks as above described, the securin means being omitted from,the

showingof Fig. 5 for simplicity of illustration. v

The leads of resistor'35 pass through alining bores formed in anumber' of removable bricks 38 which are laid on-brickwork of the v 60 side wall flush with thebottom of'recess 34.

These bricks may be luted with fireclay or the like. 4

To remove the. unit comprisin resistor 35, its pillow blocks 37, and its lea s, bricks 38 66 are removed and the' unit is withdrawn through the o ening in the side wall thus formed, the pi low blocks 'slidin along 'the bottom wall. The unit is assemb ed in position by stapling the resistor to its pillow blocks outside the furnace, sliding the unit into recess '34, and replacing bricks 38.

\ The unit described may be duplicated along the length of the furnace as may be desired.

The metal parts in the furnace, such as the staples, floors and troughs are formed from a metal having substantially the same heat-resisting characteristics as the resistors themselves- For this purpose, nickel chr0- mium alloy has been found suitable.

' What is claimed is: 1. In combination with a furnace housing enclosing a furnace chamber, a resistor com-' prising a substantiall rigid wire pro-formed into a hair-pin bend with the le s thereof helically coiled, a plurality of p' ow blocks freely seated on the bottom furnace wall, a central partition on each block providing two separated seats for'the l of the resistor, and a plurality of loop-hke staples for, taking over one turn each of the resistor coils, the blocks having bores for receiving said staples.

2. In combination with a furnace housing enclosing a furnace chamber,-a resistor comprising a substantially. ri 'd wire reformed into a hair-pin ben with the legs thereof helically coiled, a plurality of pillow blocks freely seated on the bottom furnace wall, a central partition on each block'providing two separated seats for the legs. of the resistor, and a plurality of loop-like staples for taking over one turn each of the resistor 'coils, the blocks having bores for receiving said staples and havin recesses in their bottom faces for receiving the bent over ends of saidstaples. i

3. In combination with a furnace housin enclosing a furnace chamber, a floor space from the bottom furnace wall to rovide a resistor chamber, a resistor in sai chamber comprising a substantially rigid wire formed into a hair-pin bend, leads connected to the end of said resistor, the wall of the furnace housing having a passage in line with said resistor chamber, a plurality of bricks removably inserted in said passa and having alined perforations for said eads, a plurality of pillow blocksfreely and slidably seated on said bottom furnace wall for supporting the resistor, andmeans for securing the resistor to saicl blocks, whereby upon removal of said bricks the resistor and its supports may be removed as a unit by sliding the blocks along the bottom furnace wall.

4. Incombination with a furnace housing enclosing a furnace chamber, article sup rting means spaced from the bottom 0 the furnace chamber to leave a resistor chamber below said means, a normally plugged open- 'ing in a furnace wall in line with said refor said opening the resistor unit may be sistor chamber, a resistor unit in said reremoved therethrough b sliding said supsistor chamber comprising a resistor element pgrts along the bottom 0 the furnace cham- 10 and a plurality of supporting elements freer.

5 1 and slidably seated on the bottom of the In testimony whereof, I have hereunto fiirn'ace chamber and to which the resistor is set my hand. 7

secured, whereby upon removal of the plug DAVID L. SUMMEY

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