US621267A - Magnetic lifting device - Google Patents

Description

Pate nted Mar. I4, 1899.

A. HDNELL. IAGNE'HC LIFTING DEVICE.

{Lpplicltion Mod my 12, 1808.1

(No Madam,

lNVENTOR WITIIISSEB UNITEIS' STAT S.

PATENT OFFICE.

AMBROSE MONELL, OF HOMFSTEAD,-PENNSYLVANIA.

IMAGNETICLIFTING DEVICE.

srncmcar'ronrorming part of Letters Patent no. 621,267, dated March 14, 1899.

mu icians 12,1898. Serisll'o.680,505.. maniac.)

To all'whom it may concern.-

Be itknown that-I, Ansaosn MONELL, of Homestead, in the county of Allegheny and State of- Pennsylvania, have invented a new and useful Improvement in Magnetic Lifting Devices, of which the following is a full, clear, and exact description, reference being bad to' the accompanying drawings, forming part of this specification, in which 1'0 i-"igure 1 is a side elevation, partly in sec-.

tion, showing one-form of my improved apparatus adapted forpicking up sheets or plates of relatively thin cross-section.. Fig. 2 is a top plan view of the same, and Fig. 3 is an end elevation thereof.

My invention relatesto the picking up and holding of pieces of. metal of auy shape by.

means of electromagnets. It isprimarily designed for picking up and carryingabout these pieces to any desired point. It enablesme to pickup from a pile of iron or steel articles an one of these articles without exertingsuflicicnt attraction upon another or others of the articles to cause them to be picked up with :5 the one article desired to be lifted, while at the same time the magnets are sufiiciently strong to lift. a number of the articles, or even ihe whole pile,.provided they are mechanically tied to the article lifted. 0 My improved device enables me to pick up articles'haviugconsiderable range as to weight and thickness or size, while at the same time the abovenam'ed functions are carried out.-

To that end my invention consists in a series of magnets the lifting power of which is proportioned to lift the heaviest weight desired and each magnet being proportionedso be practically completed through the small- 0 est. thickness of article to which it is applied,

these magnets beingearried on an equalizing- :uipport which distributes the lifting strain equally am (mg them. By using the series of magnets proportioned and supported in this .among them.

that the magnetic lines between its poles will murmu -iv? i.i.!" diflieult has always occurred that when a magnet was so proportioned as to retain a reasonable factor of safetyin picking up certain articles itwas not adjustedso as to do only the work required and no more.

With these former devices, therefore, it was found almost impossible to pick up'one arti-' cle from a pile, especially if these articleswere of different weights, without lifting one or more-others from the pile.

In applying my invention to the picking up of broad flat pieces of material-en ch as slabs,

plates, sheets, &c.--I employ a series of electromagnc 3, these being sufficient in number to give the desired lifting force for the heat: iest weight to be lifted with a-larg'e factor-of safety, while the size of each individual mag net is so proportioned that its magneti'elines of force will be substau'tiallycompleted through the thinnest plate, slab, or sheet to be liftedthat is, the heaviest weight to be. lifted governs the number of the eleetromagnets, while the smallest cross section or thickness to which the magnet is applied-that is,' between the polesbf the magnet'govcrns the size and design of the individual magnets. These magnets are niounted'on an equalizing-support which distributes the lifting strain equally The instructions just given will make it clear to the practical electrician just how the magnets should be constructed within the principles of my invention, for the direction of the lines of force in anygiven magnet' is easily determinable and the poles should be so related, as above stated, that substantially body to be lifted,

In the drawings, in which I show my apparatus as particularly designed for picking up plates, 2 is a liftingbar centrally and pi votally supported from a chain 3, depending froma trolley or any other desired support, this bar having curved rests 4 at its ends, containing cleviees 5, secured by clips 6, within which clevis is secured across-bar 7,havingswinging bars 8 at its ends. Each bar 8 is provided near its end with curved rests 9 for the curved portions of the cores of ordinary horseshoe-electromagncts 10. Flexible conductors 11 are provided to lead the current to the various magnets, and suitable switches may be provided to energize and deeuergize the magnets,

all the lines of force shall pass through the energized, the lines ofrforce 'of "each magnet will be practically completed through this S of liftingother adjacent articles with the one desired tobe lifted. The system of equalizerbars enables the magnets to adjust them; selves to-the position in which the article is lying, as well as its shape, so the plates'lying at an angle, as well as curved, plates, may

be picked up and tra'nsferred'to the desired point, The bars'are also arranged so that the lift of the device will be substantially evenly distributed amongthe magnets. The magnets are of course-.deenergiaed to drop the plate at the desired points 1 I If it is desiredto lift more-than one plate, clamps or yokesmay beernplo'yed to fasten the plates temporarily together, and the series of plates will then be lifted if their combined weights are within the limiting weight for which the magnets are proportioned.

Inconstructing the device, to'give a specific example, if it is desired to lift single-plates varying in thickness from one-halfan inch to two inches and to lift a weight'varying from five hundred to seven thousand pounds, each individual magnet will be proportioned so 40 that the lines of force between its poles will single article, so. that'there will be no danger gle article may be lifted from a pile without danger of lifting any of the adjacent articles, and this article may vary widely between the determined limits for which the apparatus is designed both in cross-section and in weight. The equalizing-bars enable the magnets to adjust themselves to the plate, whether curved or lying at anangle, and the whole system is simple and easily constructed.

Variations may. be made in the form of the magnets, as well as in their arrangement and means for -su pport, without departing .from myinvention, since I consider myself the first to arrange magnets for this purpose according to the principle above stated on an equalizing-support.

I claimbeing proportioned. to lift thc'heaviest weight desired, and each individual magnetbeing proportioned so that'the magnetic lines between its poles will be practically completed through the smallest thickness of article to which it is applied, means for energizing and 'denergizing said' magnets; and an equalizing-support for the magnets arranged to distribute the lifting strain equally among them substantially as described.

2. In a magnetic carrying device. a pivotal support having pivotal equalizer'barmand electromagnets carried upon' said equalizerbars, the bars being arranged so that-the liftin g power will be substantially evenly distributed over the surface among the magnets; substantially as described. 3. In ,a magnetic carryingdevice, a pivotal support carrying swinging equalizer-bars and magnets carried u pen the equalizenbars', each magnet being. so proportioned that the mag- -netic lines between its poles will be substan- 7o 1. In a magnetic carrying devlce, a series of electromagnets, the lifting power of the'series I all be substantially completed through the halfinchplate, while ,a sulficient number of magnets will be provided to lift seven thousand pounds with ,a large factor of safety; 5 Hence it will be seen that in any single plate varying from one-half inch to two inches in thickness and in weight from live hundred tiall'y completedthrough the smallest ,thickness of metal to which it is applied, the lifting power of the series of magnets being proportioned to lift the greatest weight desired; substantially as described;

In testimony whereof I have hereunto set too to-seven thousand pounds tlggdlines offorce my hand. i will be substantially comple through this 1 J gin article and it -wil ibe'liftedsingly from apile AMBROSE MQNEI of articles; a Witnesses:

Tnouas W. .BAKEWELL,

The advantages of myi'nveri tion result from r G. I Honnsn1r.

the fact that with a single lifting-device a sin-

Images