US1546424A - Electric-wire-wound hemisphere - Google Patents

Description

July 21, 1925,

M. M. WOOD ELECTRIC-WIRE WOUND HEMISPHERE Filed May 7, 1921 2 h ts-Sheet 1 July 21, 1925. 1,546,424

M. M. WOOD ELECTRIC WIRE WOUND HEMISPHERE Filed May '7, 1921 2 Sheets-Sheet 2 Patented Jul 21, 1925. v

' UNITED STATES 1,546,424 PATENT OFFICE.

moN'rRAv'rLLE M. woon, or BERWYN, ILLINOIS; CARRIE r. wooD EXECUTRIX or v SAID MONTRAVILLE M. wooD, DECEASED.

Application filed Kay 7, 1921. Serial No. 467,662.

To all whom it may concern:

Be itknown that I, MONTRAVILLE M. \VooD, a citizen of the United States, residingat Berwyn, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Electric- VVire-Vound Hemispheres, of which the following is a specification;

In various arts, among them that of wireless telegraphy there are mechanisms which require coils of electric current carrying wire, to be wound to conform in curvature to a hemisphere. The object of thisinvention is to provide a device of this kind'xin an easy and economical manner, which. is for the purposes of its use accurate in construction, and not liable to' get out of order. The invention consists in mechanism for attaining the foregoing objects and in other special features and details of construction hereafter more fully .set forth in the specification and claims.

Referring to the drawings in which like numerals denote. like parts thruout the several views,

Figure 1 is a plan, and

Figure 2 is a side view of a completed structure illustrating this invention in its preferred form.

Figure 3 is a plan view of the frame or carrier used to more or less permanently supportthe wire in the hemisphere illustrating this invention.

Figure 4 shows two hemispheres of Figure 2 assembled in a complete sphere.

In constructing the hemisphere of this invention a sheet of more or less rigid, yet bendable material, such as paper is provided, preference being given however, to a material which can be dissolved from the wires of the finished hemisphere by the use of a suitable solvent. This sheet of paper or other light material is first layed out flat as shown in Figure 3, a central portion 10 marked ofi" and about this center radial V- shaped notches 12 are cut so as to leave an odd number of generally triangular slightly bell shaped spokes 14 extending outwardly from the center 10. The widths of the notches 12 should be such that when the center member 10 is supported and .the

spokes 14 are bent downward, as vlewed in Figure 2, (or upward if the device is reversed) what is practically a hemisphere of paper or-like material is formed with narby circumferentially winding the device with wire 16. In doing this the operator begins at a suitable point as 18 at the air-- cumfere-nce of the central portion 10, and winds around that center in circles carry- 1ng the wire under and over alternate spokes 14 at each radial V-shaped opening 12 just draws the wire tight BIlOlTgh so that when the final convolutions 16 of the wire are put on, the entire hemispherical structure is as is done in basket makin and in so doing rigidly held in position, as shown in Fig- 7 ure 2.

For purposes of supporting the hemisphere in the operation of construction or otherwise, the radial spokes 14 may be left with end portions 20, tapered if desired, as shown extending beyond the general circumference formed by the ends of the. other spokes so that these end portions actas supporting legs carrying the partially or wholly complete hemisphere up a slight distance above a table or other support. These end portions 20 are also of assistance for fastening purposes when two hemispheres of this invention are to be put together to make a complete sphere or an approximation thereto as shown in Figure 4 wherein the parts 20 of opposing hemispheres are overlapped and secured together by any sort of conventional fastening means as rivets 22.

One embodiment of the invention contemplates the leaving of the structure as shown in Figure 2, with the framework 1014 acting as a support for the basket 1 like wire structure 16. In such a case the support should be preferably but not necessarily of insulating material.

In another embodiment of the invention the structure of Figure 2 may be immersed in a solution which will dissolve out the support 10-14 and leave the wire structure 16. In either case a suitable liquid,

such as shellac may if desired be applied to the wires to dry and set in the well. known manner and hold the wires in place after said liquid dries. This is not at all necessary when the framework 1014 is left in the wire hemisphere. I I

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. An inductancecoil comprising a core of hemi-spherical shape composed of a plurality of arms radiating from a common point in said core, and wire wound over and under said arms.

2. An inductance coil comprising a core of spherical contour composed of a plurality of arms radiating from a common point in said core, and wire wound-over and under said arms.

3. The method of determining the contour of electrical coils which consists in Winding wire on a normally flat pliable core with sufiicient tension to progressively impart to the core and its associated coil a rounded contour.

'4. The method of determining the contour of electrical coils which consists in winding wire over and under radiating arms of a normally flat pliable core with sufl'icient tension to progresslvely impart to said arms and their associated'coil a rounded contour.

5. A method of makingan' nductance coil which consists in winding a skeleton hemispherical support with'a series of convolutions of wire extending in and out of the support, and subsequently assembling and connecting two such pre-wound supports to forma completed hollow spherical coil.

6. A variometer inductance coil comprisnesses.

MONTRAVILLE M. WOOD. Witnesses:

DWIGHT B. GHEEVER, VEIMA GRIFFITH.

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