US792762A - Dynamo-electric machine. - Google Patents

Description

PATENTED' JUNE 20, 1905,

C. S. DUNN.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED OCT. 24, 1904.

" UNITED STATES Patented June 20, 1905.

PATENT OFFICE.

GANO S. EUNN, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO CROCKER- WHEELER COMPANY, OF AMPERE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

DYNAMIC-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 792,762, dated June 20, 1905.

Application filed October 24, 1904. Serial No. 229,738.

To all whom it flea/y concern.-

Be it known that I, GANO SILLICK DUNN, a citizen of the United States of America, and a resident of East Orange, countyof Essex,

State of New Jersey, have invented certain new and useful Improvements in Dynamo- Electric Machines, of which the following is a specification.

This invention relates to an improvement in dynamo-electric machines of the substantially inclosed type, wherein the bearing for the end of the armature-shaft adjoining the commutator is supported by-an end shield which is secured to the inclosing frame, preferably by screws,this being a type of construction of manifest advantage by-reason of the convenience of manufacture and machining of the parts to secure proper alinement.

The object of my invention is, while retaining this type of construction, to do away with the complications, large number of parts, difficulty of insulation, danger of vibration, and liability to shrinkage and consequent looseness usually found in brush-riggings and to i provide an inexpensive brush-rigging wherein the end shield is utilized directly as a support for the brush-holders, the attachingscrews of which form the connection for the outside conductors, and thereby save a special terminal board. Suitable provision is made for the proper setting of the brushes at their proper points for minimum sparking by the mere provision of elongated or large holes or slots for the screws which hold the end shield to the frame, so that such shifting of the brushes as may be required is effected by loosening the screws which hold the end shield to the frame and rotating the shield as a whole.

In the accompanying sheet of drawings, which forms a part of this application, Figure 1 is a vertical section through the inclosing frame of a dynamoelectric machine embodying my invention, the front shield being broken away on the line A B of Fig. 2 and the rear shield being broken away on the line A C. Fig. 2 is an elevation of the machine in which portions of the front shield and the inclosing frame at the right are broken away.

and an armature alies between the coils, all

of these parts being inclosed and protected by the frame. The open ends of the frame are bored out in alinement with the axis 5c 50 of the machine and faced off at right angles thereto. A front end shield 5 and a rear end shield 6 cover the open ends. Flanges 7, which are parts of the end shields, are turned to fit the bored holes in the ends of the inclosing frame and are means for centering and alining the shields with respect to the frame, The shield 5 incloses and protects the commutator S and supports a bearing 9 for the armatureshaft adjoining and outside the commutator. Four insulating-bushings 10, of porcelain, pass through tapering holes in the shield and are fastened in place by type-metal 11. Metallic studs 12 pass through two of these bushings and screw into brushholders 13 on the inner side of the shield. Nuts 14 on the outer ends of the studs draw the brush-holders firmly against the ends of the bushings. Tongues 15, formed on the hubs of the brush-holders, fit into slots in the ends of the bushings and hold the brush-holders firmly in angular relations, so that the brush-holders and studs are rigidly supported by the end shield, and the outwardly-projecting ends of the studs can be employed as the terminals of the machine, to which the conductors leading away from the machine are connected. The other two bushings carry terminal studs 16 for the field connections. Nuts 14/ on the ends of the studs clamp them in the bushings. Additional nuts 14 bind the ends of the fieldwires on the inner side of the shield and the field connections on the outer side of the shield. Carbon brushes 17 are guided in the the commutator.

brush-holders and pressed by springs 18 tion is intermediate of the positions for run-- ning in either direction exclusively, provision is necessary for the adjustment of the brushes around the commutator. For this purpose circumferential slots19 are placed in the rim of the shield, and cap-screws 20 pass through these slots and are tapped into the frame of the machine to permit of circumferential adjustment of the end shield to bring the brushes to the desired positions. These slotted holes are unequally spaced around the rim, so that assembly is possible only in one way, and the user will be prevented from attempting to assemble differently to adapt the motor to different suspensions.

To render the machine adaptable to wall or ceiling suspension, as well as to support from the floor, in all of which positions the bearing, which is self-oiling, must be kept with the same side up, provision is made for the setting of the bearing to either of four positions Withoutrernoving or loosening the end shield and disturbing the adjustment of the brushes. The support for the bearing in the end shield is chambered on all sides of the shaft for an oil-well. There are four holes 21 around the sides of this chambered hub of the end shield, and a petcock 22 is screwed in whichever one is lowest. depending on the suspension to draw out the oil. The other the shaft.

the frame and turned to bring the bearing 7 right side up when the direction of suspension of the machine is changed. The shield? is held to the frame by four screws 26, which are evenly spaced. so as to permit of the attachment of the shield to the frame in either of the four positions nesessary for this purpose. 7

What I claim as new, and desire te-secure by Letters Patent of the United States, is-

In a dynamo-electric machine, the combination with the field, armature and commutator, of an inclosing frame for the'field and armature, brush-holders,-abearing forthe armature-shaft adjoining and outside'the commutator,and an end shieldprovided Witha support for said bearing and circumferential slots, means for centering the end shield with respect to the inclosin'g' frame, screws passing through the slots for attachment of the shield'to the inclosin'g frame, insulating bushings rigidly supported in theen'd shield, metallic studs rigidly supported in the-bushings andpassing through 'the shield, 'the inner ends of the studs'serving as supports for the brush-holders and the outer ends serving-as terminals for the machine, substantially a described.

Signed by me at East Orange, New Jersey, the 21st day of October, 1904. a i

GANO SI'D UN Witnesses:

HOWARD M. GASSMAN, ROBERT B. TREAT.

Images