US978119A - Lifting-magnet. - Google Patents

Description

A. C. EASTWOOD.

LIFTING MAGNET.

APPLIOATION FILED MAY 13,1910.

978, 1 1 9. .Patented Dec. 6, 1910.

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To all whom it may concern:

1 woon, a. citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio,l have invented newand vuseful Improvements in. Lifting-Magnets, of which the following is a specificationK My invention relates broadly to electromagnets, but has special reference to what are termed lifting magnets, and its object is t'o construct the same so that the mag.- netizing winding may be thoroughly insulatedagainst grounding or short-circuiting vdue to the high inductive voltage generated in the winding'when the source of energy is cut off kor to other causes.

Referring to the accompanying drawing, Figure l is a perspective of a unit winding constructed in accordance with my invention; Fig. 2, a central vertical section of Fig. 1; Fig. 3, a perspective of one of thev insulating spacers which I -place between successive coil sections of thewinding; and Fie. 4, a perspective of a portionof a spacer di ering from the construction shown on Fio.' 3.

'Io facilitate an understanding of the present invention, I refer to Letters Patent No. 928,510 granted to me July 20, 1909,

in which. Figs. land 2 show' a unit 'wind- .ing designed Afor the same purpose as the Cstructure shown on Figs. l and 2. of the' drawing of this application, but it is to be understood that my invention is appli-' cable to windings designed for various uses.

and mounted and constructed in different ways from the Way shMn on the said Letters Patent.- In fact, it is applicable to all electro-magnets having'a'number of super# posed coil-sections, whether clamped together in units or not.

On the drawings, the bottom plate A, composed preferably of brass is provided at its inner edge with the upstanding tubular flange or mandrel a4. On thetop of the plate A, I place the unslot-ted annular insulating spacer or plate @which supportsthe lowest winding section e. O n top of`the winding sectionf ei is the insulating spacer or plate a7 provided with the slots or'channels 7c preferably arranged radially and extending through the entire thickness of the plate al, but the slots may be grooves as. shown at l, on Fig. 4`or otherwise. `I place another winding-sectione2 Ispacer or plate a on the section e2.- The winding sections is placed er1-the second plate a?, and another insulating spacer or plate a is placed on the section e3, The Winding section e* is placed on 'the third plate a1 andthe insulating top plate a8 is placed onthc section et Radial clamping straps s, 82,83, vfare placed over the top-plate as and are drawn down by means of screws d and d2, the

screws d en aging with bosses in the upper'` end of the ange a4 and the bolts d2 passing through holes near the outer edge ofi"v the bottom plate A, these straps binding the winding sections, the bottom. plate, and the insulating plates into a unit winding, which may be moved" and assembled in a magnet f case Without injuryto the winding. After thisA unit has been assembled, it is placedl in a suitable impregnating air-tight receptacle which is preferably heated and in which it4 is' dried under vacuum, both the moisture and the air being removed from the' interior and the surface of the unit andai; a tem. perature that prevents deteriorationof the insulating material which goes to makeup the unit.

When the unit is thoroughly vdried and I While under vacuum,- a h ot liqu1d insulating compound is admitted into the 'vacuum chamber, which now becomes the impregnating chamber. The moisture and air having been removed from the pores of the insulat-- ing fabricormaterial, this compound penetrates into the innermost parts of t2 e same and into all vacant spaces throughout the. unit. After the compound has covered Vthe unit, compressed air is yadmitted to' the chamber above the surface of the compound and forces the same into'every-interstce and pore in the unit. After the, unit is removed from the chamber, the compound cools and hardens.

I- have not illustrated .the Ameans for treat-l ing the unit winding, as those acquainted with the art of making" magnets will readily' understand how to'fconstructfsuch means;

assuch means are well-knownrto those acquainted'A with .the art, the Emil Passburg system being specially adapted to the purpose; and as the magnet frame or casing may be lemployed as the vacuum and impregnatingclntmber, when connected to suit* able pu"ps'and a tank containing the hot liquid impregnating material. Even if the windlng were not subjected to a vacuum, the passages in the plates a,7 would aid materially in causing the insulating compound to pass to the interior of the winning.

The spacers or plates may be variously constructed to provide passages leading to the interior of the Winding; and these passages may be variously shaped and arranged.

I elaiml. ln a magnetwinding, two or more superposed vinding-sections, each composed of a fiat spiral having` a plurality of convolutions, and insulating spacing means between adjacent Winding sections, said means having passages therein leading to the eX- terior or' the winding so as to lead moisture and air from between the successive convolutions of each sectionand `to"`ad1nit insulating compound between the said convolutions. For a magnet-winding havingitwo or i more superposed winding-sections5 insulating spacing means between adjacent sections, there being passages in each spacing means, b which a fluid insulatin material may be introduced into the interlor of the winding,- or air and moisture may be eX- tracted therefrom, or both.

Signed at Cleveland Ohio, this 11th day of May, 1910.

ARTHUR C. EASTWOOD.

Witnesses:

W. M. Dumm, H. S. RICHARDSON.

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