USRE9993E - Abthtjb e - Google Patents

Description

Reisued Deo. 27 ,1881.

A. E. BRIGGS; y Assignor to POST & Co.' MAGNETO LLEG'IRIG MACHINE.

No.A 9,993.

Invc ntr e 5.' 7% i ,"UNITED STATES? #PATENT C)rrrcn.

An'r'nnnfn. Barcos, or CINCINNTI, onto, 'AssIeNon- To'jrosr a oo.,foF

' V SAME PLACE. Y.

MAGNs-ro-ELECTRI'C; MACHINE.

SPECIFICATION' formingvpart'of Reissued Letters Patent No, 9,993, dated December 27, 1881..

` Original No. 226,386, dated April 13, 1880. AApplication for reissue led November` 1., 1881. I

i .To all whom itma'y concern:

Be it known that I, ARTHUR E. BRIGGs, of Gincinnathin the county of Hamilton and State of Ohio, have invented a certain new andvuseful Improvement in. Magneto-Electric Machines; and I do herebydecl'are the following to be a full, clear, and exact description of the same, reference being had to the accompaengine, showing my improvements. a longitudinal section through the -cylinder of j, the engine. l' 4 is a top view of the cylinder with the magnyin'g drawings, forming part of this speeiii cation, in which- Figure l is a perspective view of a magneto- Fig.V 2 is Fig. 3 is a perspective view of' one Vof the cast-iron' sides of the cylinder, and Fig.

Similar letters of reference in theseveral Vigurcs denotthe same parts.'

y Myinyenti'on relates to the manufacture and .use of magneto-engines or electric generators- 'of that class in which a cylinder is employed located between the' two poles of a magnet and tors is composed of twocastfiron plates, G G,

containing a revolving armature and coil, by which the current isgeneratedA and transmit'- tuedgl and-it has for'its objetto improve the 'construction of the cylinder and cheapen the cost lof itsproduction, and to 'insure Vthe more effective working of the engine, as I will now proceed'to describe. 4 In thel accompanying drawings, A represents the cylinder; B, the armature and the'coil herein, and C Ctwo magnets ofthe horsesh pattern,w-hich 4embrace the cylinder between their poles, and are clamped to each other by the bolt D and blocks'E i A b The cylinder in thisv class of velectric genera at the upper and lower sides'bearing against the magnets, and of two; brass plates, H H, interposed between the cast-iron plates, to

l which they are secured.

It has heretofore been the custom' to cast the iron and brass plates separately and then rivet or screw' them together, the contact-surfaces being first filed down or milled, to insure the necessary bearings and an accurate lit. This construction is objectionable and defective, be-

^ cause ofthe expense and labor attending the 50.

working and iitting of the plates, and because they cannot be so securely fastened together use for a1 considera` .bear 'against the permanent magnets. Two of these plates'are cast for a cylinder, and are. 'secured together in the following manner: One

plate is-iirst placed in the sand, with the concave side uppermost. A-'core is then laid upon the upperside,and the top plate laid upon the core. The molten brassis then poured into the mold, VfillingI the spaces between the two plates and entering the dovetail recessesi'hto form the dovet'ail keys. As the brass cools'fits contraction is greater than the iron, andthe `result is that the dovetail keys are drawn firmly into4 the duvet-ail spaces and a secure and permanent lock is produced, asshown in the drawings, without milling, filing, or otherwise preparing the plates to produce a perfect Y 75 fit. To. finish the cylinder thus formed, it is onlynecessary to bore itfout accurately to receive the armature.

Vlhe'projecting ends K K of the iron plates -shown in Fig'. 3 are employed merely to sustain theplatesin the sand, and are removed when the casting of the'cylinder is-completed.

The cylinder made in the ordinary wayis not a true circle inside. The. arl-nature therefore cannot be turned down to make a neat it,so that through its. whole length" it may beas near as possible to the'magnet; but it is. essential to the eective working of the engine thaty the armature shall be throughout its whole length as near as possible to the magnet, because the strength of the current is inverse to the squarev of the distance of the armature from the mag-` net; but in my inuenti'on the ymetal plates are as to prevent them from working loose after oo l cast together, and the cylinder thus formed/is reamed out to a true circle. The armature'. is also turnedV to a true circle,`thus bringing it through its whole length the nearest possible to the magnet. The cylinder,'being solid, cannot, by the wear and tea-r of use, or by thedriving on of the magnets, get 'out of line with the armature.

The generator is usually applied to use, parvl.(OO

ticularly fortelephonic lines, by placing itwithin a box, andthe armature is rotated by a box, and a projecting arm, O, forming part of the brass casting andextendingjbetween the two magnets. The crank is arranged-outside the box in the usual manner, and the large pulley carries a rubber ring, P; around its periphery, to t. into the groove of the armaturepulley L.`r The rubber ringmaybeintheform of a dat ring or a round cord stretched into the pnrpose of producing the necessary frca magneto-engine orelectric generator by castthe grooved edge ofthe pulley, as shown, for

tion to rotate the armaturewhen the crank is turned. The constant or frequent use of the `generator causes the rubber ring to wear away,

'- come this defect I make the larger or driving I' pulley adjustable, to compensate for the wear of the ring, by employing an adjustable bearing for the crank-shaft, This bearing is com posed of atube, R, having aplate, S, castuponl its outer end, and is extended through a slot .inl the arn`1-0,between the magnets,so that the plate S shall bear against the outer side ofthe arm, where it is Aheld by the screws T. The l endsoithe plate are slotted for the passage of the screws, and therefore, when the screws y are loosened, the plate can be 'adj usted onthe -arm to move the driving-pulley nearer to or farther from the armature-pulley, for the pur- `pose above stated. .n 35

The generator may be secured within its box -by passing screwsthrongh the end of the lat- 'ter into the outer face of the cylinder at the points 'u u, and by-ascrew through the bottom of the box entering one 'of the lelampng- 4o blocks E, which rests upon the bottom. Any p other convenient mode may be employed,howl ever,v for securely fastening the generator in Gplace.' l y A Having thusy described my inveutioml claim 4,5

1. 'The mode of constructing the cylinder of 'ing the brass portionsor sides upon the iron plates with a dovetail lock,substantially as de- 5o scribed. y f .2. Thecompoundl metal cylinder of a magneto-engine or electric generator having vits plates secured together by dovetail locks,sub lstautially as described. 1 `3. In a magneto-engine or electric generator, 'a castcylinder composed of alternate plates of magnetic and diamaguetic metals, substantially as described. Y

In testimonyof which'invention I set my hand.

g ARTHUR E. BRIGGs.

Witnesses:

J EPrHA D. GARRARD, JOSEPH Cox, Jr.

hereunto 60

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