US593571A - Magnetic clutch - Google Patents

Description

(No Model.) T; J. FAY.

MAGNETIC CLUTCH.

No. 593,571. Pate nted Nov. 16, 1897'. C

i C I INVENTOR C v UNITED STATES PATENT. -OFFICE.

THOMAS JIQFAY, or BROOKLYN, NEW YORK, ASSIGNOR' To run AMERICAN ELECTRIC COLD SUPPLY COMPANY, or MAINE.

MAGNETICCLUTCH.

SPECIFICA'IiOlN-forming part of Letters Patent No. 593,571, dated November 16, 1897.

- Application filed February 5, 189% Serial No; ii23,029. (No model) To all whom-it may concern.-

Be it known that I, THOMAS- J. FAY,a citizen of the UnitedStates, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Magnetic Clutches, of which the following is a full, clear, an'd,exact de' seription. L

This invention relates to the transmission of mechanical power bymeans of a magnetic clutch, the object beingto provide for the transference of power from one member of the clutch to the other through a stationary diaphragm without experiencing any inefii- .ciency of the clutch due to "the creating of extra currents in the diaphragm;which would, if permitted, engender a force counteracting that of the clutch.

To fully explain the nature and utility of my invention it will be necessary to explain the apparatus or machine with which the clutch is associated, and this I will do in the detailed description which follows, reference being had to the accompanying drawing,

wherein a general plan of the entire appa-.

'ratus is shown, certain parts being insection.

- on. opposite sides with cylinders a, projecting A' is a hermetically-sealed.casing provided from its walls, but opening intotheiin-terior thereof. "In each cylinder is a piston a, provided with a valve a 0 enin in such a direction that upon the back stroke of the piston gas or air in the chamber or cylinder will pass through and in front of the piston,'.

the valves closing on the return stroke. From the cylinders suitable exit-pipes a lead. An

inlet-passage for air orgas is provided at bf The'piston-rods a. connect, respectively, with eccentric-pins 0 upon gears 0, these gears being fixed upon the, opposite ends of a short shaft having its bearing in box (1. Directly under the gears c are pinions e, mounted upon a shaft which hasa bearingin the same pillowblock upon which box d is fixed. This shaft, which is lettered f, carries at one end a softiron cross-head g, constituting thearmature of a magnet, as will hereinafter appear. This cross-head is of yoke shape, having two poles facing toward one of the walls of the casing A, in front of which it is adapted torotate with very slight clearance.

The apparatus inside of the casing A will compress the gas, which it receives through passages a to any desired point forconsumpt-ion or use. In some of the arts, such as that or pungent, and it is necessary that the machinery and apparatus operating upon it shall leakage. It will therefore be understood that a means for driving the pump herein doscribed'from an external source'of power withoutperforati-ng'the wall of the casing for the always leak more or less, is a great desidera tum. Such means have heretofore been invented by me and described in another application, filed September 30 1896, Serial No. 607,426, the same consistin essentially, of an electromagnet mounted to rotate with the driving-motor, and whose magnetic flux or the casing and acts upon an armature located therein and carried by the driving-shaft. of thepump. The improvement herein pertains to thisdevice.

of a shaft g. It consists of a core 19 and suitable cdilsp wound thereon. The coreis U- shaped and is arranged with its poles facing toward the wall of easing A directly 0p osite the soft-iron cross-head g, which constitutes the armature of the magnet. Shaft q is driven by' any suitable source of power, the'pulley q representing such source. The magnet and with and, from the pump. j V

It has been found in practice that the electromagnet in acting through the metallic wall of the ease generates therein electric e urrents, due to the moving magnetic lines of force, which cut it at right angles; These electric currents travel through the diaphragm in circles always surrounding the path of the lines of force or the core of the magnet and-are known in the art as eddy or Foucault? currents. Apeculiarity of these circular cur.-

theinlet 1) and force it outward through the p 1 of refrigeration, the gases used are obnoxious path leads through the unperforated wall of.

be recognizedfat once as a pump adapted to not permit its escape into the atmosphere by passage of a shaft, the bearing of which would P is an. electromagnet mounted ori the end its armature constitute a clutch adapted to connect and disconnect the sourceof power rents is that their direction is always 0 posed to that of the current in the co ls pr marfly -than the rate of increase of the speed, so that with a given magnet a speed is soon reached beyond which the clutch will not transmit the power, and it is proportionally inefiicient for the lower speeds. I overcome this diificulty by making the wall of the casing through which the magnetic clutch acts of material whose electrical conductivity is very poor, or, to state it another way, whose electrical resistance is very highviz., too high to permitthe formation of eddy-currents to any a ppreciable extent. Sucha wall or diaphragm is shown at s. It may be of hard rubber, fiber, vitreous material or a. composition havingsimilar characteristics, or a special me- 7 tallic alloy. A diaphragm of such material will not lessen the efiiciency of the magnet as a clutch to any appreciable extent and it may be easilysubstituted for a portion of the wall of the casing A, the joints beinghermetically sealed without difficulty.

It is obvious that a magnetic clutch for the purpose herein set forth may be made in various shapes and have any suitable number of poles and energizing-coils.

Having thus described my invention, I claim- The combination of a hermetically-sealed case, a machine therein having a main rotating shaft to be driven, a driving-motor and its rotating shaft located outside of said casing, an electromagnetic clutch having its two members'mounted respectively on the two retating shafts, one member being inside'the casing and the other outside thereof, an unperforated wall of the casing composed of dielectric material being interposed bctweenrthe two members of the clutch; and through which the clutching and unclutching of the two rotating shafts is effected. I

In testimony whereof I subscribe my signature in presence of two witnesses.

THOMAS J. FAY. Witnesses:

FRANK S. OBER, HARRY BAILEY.

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