USRE12243E - Means for insulating electrical apparatus - Google Patents

Description

REISSUED JULY 19, 1904.

- B. 1).v PRIEST. Y MEANS FOR INSULATING ELECTRICAL. APPARATUS,

Inventor. Edward D. Prie st. WW

APPLICATION FILED FEB. 20, 1903.

Witnesses. I

UNITED STATES Reissued July 19, 1904.

PATENT OFFIC EDlVARD D. PRIEST, OF SCHENECTADY, NEW YORK, ASSIGNOR TO THE GEHERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

MEANS FOR INSULATING ELECTRICAL APPARATUS.

sracrmciu'roiv forming part of Reissued Letters Patent No. 12,243, dated July 1e, 1904.

Original No. 648,052, dated April 24, 1900. Original application for reissue filed May'lfi, 1901, Serial No. 60,400. Divided and this application for reissue filed February 20, 1903. Serial No. 144,240%.

To all w/mm it may concern.-

Be it known that I, EDWARD D. PRIEST, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Means for Insulating Elecinsulating=support in section.-

The brush-holder is made in two parts O and U. The former comprises suitable receptacles and guides for the brushes, while the latter is in the nature of a support and is bolted to the field-frame or other fixed portion of the machine.

The brushes 1) are retangular in shape and are mounted in correspondingly shaped 7 guides E As shown, a number of brushes are provided, each capable of independent movement. The brushes are forcedagainst the commutator by spring-pressed arms F.' The main pressure on the brushes against the commutator isobtained from coiled springs G; but in order to compensate for minor irregularities the end of each arm is itself a spring and is, provided on ,the under side where it engages with the brush with a curved wearing-strip F. The outer end of the arm is extended to form a hook F whereby the arm may be raised to permit the insertion of a new brush or the examination of an old one. The spring G is secured at its rear end to the casting H, which is mounted on the shaft 1, and mounted directly over it, and also secured to the casting H is a plate M for limiting its outward movement. Each brush-arm casting is provided with a hub having a number of radially-extending portions H, around which the spring (1? is coiled. The castings are retained in place by the shaft 1, which extends through the brush-holder from end to end.

DIVISION B.

This shaft is supported at its outer ends by the sides O of'the brush-boxes, and'at intermediate points by the projections J.

.Extending outward from the hub of the casting H toward the brush is ahooked arm H and engaging with this arm is one end of the coiled spring Gr, the other end being slightly cifrired and engaging with the rod K, which extends parallel with and just back of the brushes. The rod K is supported at its outer ends by the sides O? of the brush-box and at intermediate points by. the ears K. It

will be seen that the center of movement of the spring is the same as that of the brusharm, and that the ends of the springs are secured at points between the brushes and the support for the castings H. Thisis a very desirable arrangement, as it reduces the pressure on shaft I to a minimum, thereby decreasing the wear on the same, and at the same time provides a construction wherein the pressure on the brush is uniform over a wide range of movement. 7

In order to increase the conductivity between the parts and at the same time shuntany current around the springs, flexible cables L are employed, which are secured at one end to the holder at points near the brush and at the other end to webs which connect the radial projection H on the casting H. AS a further precaution against heating, flashing, and the portions O, one of which is shown in section,

and a socket O for receiving a cable for conveying current. Mounted within the cupshaped portion O is a screw-threaded metal plug P, arranged to receive the retaining-bolt. 1

Surrounding this plug is a layer of insulation R, preferably of mica on account of its firmness and insulating qualities, over which is a metal sleeve S. The sleeve is split, so that :tightly and will not injure it.

the sleeve is approximately the same as the The bottom of the socket is provided with a terial locatedbetween the plug and the socket,

1 that portion of the tape over the end ofthe by Letters Patent of the United States, is

when assembled lt,'Wlll grip the insulation The length of deptliofthe socket, and when assembled the two are forced together in a hydraulic press.

layer of insulation, as is also the head of the screw-threaded piece P, and in this manner all leakage is prevented. After the above-mentioned parts have been assembled a layer of adhesive tape T is wound thereon, as shown in section, and an insulator U, preferably of refractory material, is slipped over the tape. The tape serves to increase the creepage surface and also as a cushion for the insulator to prevent breakage. The insulator is provided with an internal shoulder which engages with socket and is held in place by the retainingbolt. The outer surface of the insulator is corrugated, so as to present an extended creeping surface.

What I claim as new, and desire to secure 1. The combination ofametallic socket, a pluglocatedtherein, a body of insulating maand an insulator applied endwise over the end I of the plug and the socket. 2.' The combination of a socket,a screwthreaded plug surrounded by a layer of insulation, a metal sleeve surrounding said insulation and making a driving or forced fit with the socket, and aninsulator having a chamred portion surrounding a. portion ofthe plug and the socket.

3. The combination of a socket, ascrew= threaded pl'ugmounted therein and surrounded by-a sleeve of insulating material anda'; closely-fitting metal sleeve, 8. layer of insulating material, located between the end of the plugand the bottom of the socket, a winding an insulator which surrounds the plug and socket and is in direct contact with the tape. 4. The combination ofa socket, a plug mounted in said socket-and surrounded by a layer of insulating material andfa split metal sleeve, the said plug and-sleeve being forced into the socket, and alayer of insulating materiallocated-between 'theend of the plug and the bottom of the socket. j

. surrounding said sheet insulation.

'for the insulation which is forced tightly in said opening so that said partsare securely held by the friction between their'engaging surfaces.

7. Means for supporting and insulating electrical apparatus, which comprises a metal portion provided with a cup-shaped opening, a metal plug which is covered with insulation, a split metal sleeve over the insulation which fits tightly in said opening, and insulation located between the end of the plug and the bottom of the opening.

8. Means for supporting and insulating electrical apparatus, which comprises a metal portion provided with. a cup-shaped opening, a

metal plug surrounded by insulating material and driven tightly into said cup-shaped opening, and a separate insulating-ring surrounding the plug-outside of the opening. I

9. An article'of manufacture, comprisinga metallic plug having its sides surrounded by sheet insulation, and-an elastic, metallic ring 10. The combination of a socket, a screwthreadedplug surrounded by a layer of insu-' lation and a metal sleeve, the said sleeve mak;

5 ing a driving or forced fit with the socket, an -insulator havinga, ghambe'red portion sur- 'of tape around the socket and the plug, and;

, and means for holding the, support and the rounding a portion of the plug and the socket,

insulator in fiired relation.

In witness whereof I have hereunto set my hand this 19th day of February, 1903.

EDWARD D. PRIEST.

Wi-tnessest .BENJAMINQB. HULL, HELEN ORE-0RD.

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