US894950A

US894950A - Dynamo-electric machine.

Info

Publication number: US894950A
Application number: US39803407A
Authority: US
Inventors: William T Hensley
Original assignee: Westinghouse Electric and Manufacturing Co
Current assignee: CBS Corp
Priority date: 1907-10-18
Filing date: 1907-10-18
Publication date: 1908-08-04
Anticipated expiration: 1925-08-04

Description

No. 894,950. v PATENTED AUG. 4, 1908. W. T. HENSLEY. DYNAMO ELECTRIC MAGHINE.

APPLICATION FILED OOT.18, 1907.

Big. 5.

WITNESSES: Q

UNITED STATES PATENT oEEIoE.

WILLIAM T. I-IENSLEY, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA. I

DYNAMO-E LE C'IRIC MACHINE No. 894,950. Specification of Letters Patent.

Patented Aug. 4, 1908. Application filed October 18, 1907. Serial No. 398,034.

To all whom it may concern:

Be it known that I, WILLIAM T. HENsLEY, a citizen of the United States, and a resident of Wilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Dynamo- Electric Machines, of which the following is a specification.

My invention relates to dynamo-electric machines, and it has for its object to provide improved means for securing necks or connecting strips to commutator bars.

In dynamo-electric machines, the outside diameter of the commutator cylinder is usually considerably less than that of the armature core with which it is associated. Consequently, it is necessary to provide adequate means for establishing electrical connections between the extremities of the armature coils and the commutator bars, and it is specially desirable that these connections shall be mechanically rigid and durable.

My invention is illustrated in the accompanying drawings, in which Figure 1 is a side elevation, partially in 'sectlon, of a supporting structure and a single commutator bar to which a neck or connecting strip is secured, in accordance with my invention. Figs. 2, 3, and 4 are detail views of the bar and necks of Fig. 1 and Fig. 5 is a plan view showing the arrangement of two bars assembled to receive the necessary machining which adapts them for connection to the neck or connecting strip.

Referring to the drawings, commutator bars 1 and 2 are assembled as shown in Fig. 5 and are then machined to produce an annular recess or groove 3 which is equally divided between the two bars and forms a projection 4 of semi-circular section. The recesses or grooves 3 are so formed that, when the bars are assembled, their grooved portions are located near their inner ends and on corresponding sides. A commutator neck or commutator strip 5 of any suitable length is provided with a looped extremity 6 produced by rounding the end of the strip and forming a small semi-circular hole 7 which is near to, and concentric with, the rounded end. The radii of the hole 7 and the end of the strip correspond, respectively, to those groove provided in the latter, and a more 0percte of the inner and outer edges of the semiannular groove with which the commutator bar is provided, and the depth of this groove is made equal to the thickness of the strip.

The neck or strip 5 may be suitably formed by a simple punching process, and a hollow milling cutter may be advantageously used for making the slot or groove 3 in two bars at once, consequently, the amount of labor and expense involved is relatively small.

In securing a strip to a bar, the looped end of the former is fitted into the semi-annular fect electrical connection may be effe by soldering the two parts together.

The center line of the neck or strip 5 may or may not be perpendicular to the contact surface of the bar to which it is secured, this angle being adapted to the machine with which the commutator is used and being de termined by the angle existing between the flat side of the semi-circular hole 7 and the center line of the neck.

The semircircular shape of the projection 4 serves to prevent relative movement be tween the two parts, and the width of the neck 5 is preferably made substantially equal to the outside diameter of the groove 3, but this is not essential.

It is conceivable that various modifications in the size and arrangement of parts may be effected within the scope of my invention, and I desire that only such limitations be imposed as are indicated in the appended claims.

I claim as my invention:

1. The combination with a commutator bar having a semi-annular groove on one side near its inner end, of a neck or strip having a looped extremity that engages said groove.

2. The combination with a commutator bar having a semi-annular groove 011 one side near its inner end that terminates in the con tact edge of the bar, of a neck or strip having a looped extremity that engages the groove.

3. The combination with a commutator bar having a semi-annular groove on one side near its inner end that terminates in the contact edge of the bar and forms a semi-circular projection, of a concentric neck or strip having a looped extremity that fits over the projection and into the groove.

4:. The combination with a colnniutatorl In testimony whereof, I have hereunto bar having a groove on one side near its inner i subscribed my name this 8th day of October, end that terminates in the contact edge of t 1907. the bar and forms a projection, of a connect- \VLLIJIAM '1. H ENSLEY. ing strip or neck having a looped extremity \Nitnesses: that fits over the projection and into the 'l. P.i\l0DER1\I10TT,Jr., groove. 1 BIRNEY HrNEs.