US1031204A - Resistance-net. - Google Patents

Description

F. SGHNIEWINDT. RESISTANCE NET. APPLICATION FILED 0OT.]0,1910.

1,031,204. Patented July 2,1912.

1/ u A 1D 1r WITNESSES: INVENTQR a I X15] TORNEYS FRIEDR ICH SCHNIEWINIDT, OF NE'UENRAIDE, GERMANY.

RESISTANCE-NET.

Specification oi -Letters Patent.

Patented July 2, 191 2..

Application filed October 10, 1910. Serial No. 586,127.

'WINDT, a subject of the Emperor of Germany, residing at Neuenrade, in the Prov- Since of Westphalia, Germany, have invented certain new and useful Improvements in Resistance-Nets; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as w ll en able others skilled in the art to which it appertains to make and use the same, reference being had to the accompanylng drawings, and to figures of reference marked thereon, which form a part of this spec fication.

This inventionrelates to an improved resistance net made of woven wire which forms an element to be used in all cases where a resistance is built up, as in the case of motor starters, controllers, regulators, heating devices, etc.

The herein described resistance net is light and somewhat fiexible, it easily adapts itself to nesting or installation in parallel, and it has a further advantage in being well. adapted for using, in its weave, very thin wires and at the same time not reducing the stability of the net. The invention relates particularly to a wire resistance net which has asbestos or similar strands woven through it to make up the net and to properly hold and space the wire. The dlspositions of the warp and weft strands can be regulated according to the duties or ofiice of the element in which they are used, as will be-described hereinafter.

.The nets are preferably provided with a selvage, making a stiffened edge, into which, on two opposite edges, the resistance wires do not extend so that'these selvage edges can be perforated to receive rods on which the successive nets can be nested or assembled. The'nets are stifiened by a suitable solution, the solution which I find best adapted for the purpose being waterglass. I

The invention is illustrated in the accompanying drawing, in which Figure 1 is a face view of a net, and Fig. 2 is a similar view illustrating one kind of modification of the weave. Fig. 3 is a perspective view showing the assembling of several nets.

I use any usual resistance wire 10 which forms part of theweft; or cross-strands when the net is woven, and forms, in the completed net, the resistance element. The Warp strands 11 are made of insulating material, preferably asbestos, and are spaced sometimes as shown in F ig." 1 and sometimes as shown in Fig. 2, depending on whether it is desired to have a quickly cooling resistance net or one that cools slowly. The warp strands 11 of asbestos are woven in pairs that are in juxtaposition or-very close together so as to form a bite or grip on the wire at two points close together so as to hold the wire more firmly against' transverse slipping, this being assisted-by the slight embedding of the wire 10 in the asbestosstrands whereby they form slight grooves for themselves. This weaving in pairs is advantageous on account of its grouping or assembling the covered points of resistance wire which leaves a great deal of heat radiating surface of the wires exposed and for the same reason allows the Wire to cool quickly. The warp strandsll of asbestos are woven closer together on the edges to form a selvage 12 on the top and bottom edges which stifiens the two opposite edges, as will be evident. In addition to the wire 10 which forms the weft strands I provide weft strands which are made of insulating material, and these are woven into a'selvage 13 on each side of the net, which latter selvage stifiens these edges, and

not being penetrated by the wires 10, forms a means'for permitting the nets tobe assembled on rods, and so forth. The nets are woven in one continuous band and are then cut through the selvage 13 and thus made into independent nets. It will be understood that the asbestos strands can be disposed close or wide, according to whether a slowly or quickly cooling net is desired, I have illustrated one way of assembling the nets by passing bolts 14 through the selvage 13 of each net, and they can be clamped in place to any required numberc The particular form of net, however, which I desire to cover is the net shown in Fig. l in which the warp strands do not come close together in the net, being spaced farther apart than the 'wire weft strands. This particular weave, as a resistor, ischeap because of the use of asbestos, the asbestos forming a selvage on all four sides of the a net. A further advanta e of this form is the quicker cooling prop ies of the net,

due to the ventilationthereof causedby the particular weave.

To stifien andcoat I employ water-glass or any other suitable solution which will keep the absorbentfrom absorbing moisturestrands of the net or fumes;

Having thus described my invention,

what I claim is resistance between the pairs to expose short lengths of the resistof the plate to ance .wire', the warp strands being arranged closer together at the top forming a. selv'age' on thenet on vboth sides .2. A, resistance n'et closer together at the edges -vage, weft strands of insulating material and bottom edges form a stiffening selvage,

and weft strands of insulating material both side edges of the plate beyond the resistance wire for stifiening the edges.

comprlsing warp strands arranged in pairs the pairs being to form a selclosely'woven together, and together with the ends of the warp strands forming side and weft strands consisting of resaid resistance wire forming sistance wire,

the weft strands of insuthe weft between jla'ting material.

that I claim the foregoing, my hand this twenty of August 1910.

In testimony,

second day Witnesses:

CHAS. J Winona, WALTER VoNNEeU'r.

rsrnnmon sonninwinnr

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