US1181376A - Electric motor. - Google Patents

Description

C. H. J. DILG.

ELECTRIC MOTOR. APPLICATION FILED APR. 30. I910.

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ELECTRH) MOTOR.

APPLICATION FILED APR. 30, 1910.

Patented May 2, 1916. 2 SHEETS-SHEET 2 CHARLES H. J. DILG, OF NEW YORK; N. Y.

ELECTRIC MOTOR.

Specification of Letters Patent.

Patented Application filed April 30, 1910. Serial No. 558,588.

To all whom it may concern:

Be it known that I, CHARLES H. J. Duo,

a citizen of the United States of America,

and a resident of New York, in the county and State of New York, have invented a certain new and useful. Electric Motor, of which the following is a specification, the same being a. full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to electrically actuated instruments, and in particular to a motor equipmentdesigned principally for drilling, tapping and polishing purposes, and provided with a swiveling base and with means to drive a flexible shaft, whereby the motor is made capable of assuming a number of different desired positions.

With this object in view, the invention consists in certain novel features of construction and combination and arrangement of parts of simple construction and efficient in operation.

The accompanying drawings illustrate structures made according to my invention, in which like letters of reference refer to like parts throughout the several views, referring to which- I igurel is a longitudinal vertical section of a motor embodying my invention, taken on line 1-1 of Fig. 2; Fig.2 is a vertical sectional elevation of the same taken on .line 22 of Fig. 1', Fig. 3 is a horizontal section of the same taken on a plane cutting the axis of thearmature shaft; Fig. r is a view similar to Fig. 3 of, another embodiment of my invention.

Referring particularly by reference charnctel's to the drawings A denotes the f 'ame or housing of the motor,'which is of an approximately cubical or box shape, and having the bearing endsor brackets B for the armature shaft (1 symmetr' all, or of similar contour, the poles p for the field coils E being undercut on one side, as at (Z, \ijiith the faces shifted longitudinally,theobject of having tlie said faces D shifted longitudinally being to permit 'the field coils to be located centrally in the housing, while the armature core F (and pole faces) extend to one, side, whereby the commutator G and ln-ush-holders b are brought toward the center longitudinally, and within the housing, instead of being placed to one side, as is necessary when the ordinary straight pole pieces and usual shape of motor frame are used. Any suitable base H may be employed. forthe motor. In addition to thus obtaining' a symmetrical design, the construction and shape of the motors produce a number of advantages, some of which are as follows, namely, (1 securing larger air space inside of the housing and reducing the'tendency to heating, (2) larger radiating surface on the outside in the proportion of a square to a circle of the same diameter, and thus increasing the cooling a-rea; permitting the field coils to be inserted without the ne cessity of bending them, as is the case in circular shaped motors; may be made integral with, or removable from the housing, and if fastened with screws 1), as indicated, can be turned around so as to accommodate the armature core near either end of the motor, or if it be desired to shift the armature inwardly or outwardly, the pole pieces can also shifted by making the orifices in the housing, through which the said screws pass, larger, (5) the bearings, being alike, can be interchanged, which is a great advantage, inasmuch as sometimes inexpericnoedpersons may have to take a motor apart for some reason or other, and if the bearings are dissimilar, as is the case in the ordinary motors, and they should be exchanged, it would naturally result in throwing the armature core out of line with the pole pieces, thus interfering with the proper flow of the magnetic flux. I

In addition to the longitudinal ofisetting of the pole faces D, they are also oifset transversely of the casing. as clearly appears in Figs. 2 and 3. This transverse offsetting serves to bring the armature shaft forward toward the operator so that the periphery of a buffing device will extend in front of the casing and the casing will consequently not interfere with the buffing of large pieces.

My invention also contemplates a. construction in which the pole faces are offset only in. the transverse direction and such a construction is illustrated in Fig. 4.

it is obvious that various modifications may be made in the constructions shown in the drawings and above particularly described within the principle and scope of my invention.

1 claim 1. In an electric motor, in combine? (4;) the pole pieces 7 lot tially the transverse ing reversible to bring the center of the.

with the casing, detachable pole pieces having concentric poles with their center offset transversely from the longitudinal center of the casing, the pole-pieces being detachably connected to the casing at opposite points in substantially the transverse central plane and being reversible to bring the center of the poles alternately toward the front or rear of the casing.

. 2. In an electric motor, in combination with the casing, detachable pole pieces having concentric poles off-set longitudinally from the transverse center of the casing and having their center off-set transversely from the longitudinal center of the casing, the pole pieces being detachably connected to the casing at opposite points in substancentral plane and bepoles alternately toward the front or rehr of the casing.

3; In an electric motor in combination with the casing, two oppositely di osed field coils having a common axis, an two opposing polar member's carried by the casing, each polar member being surrounded by one of the field coils and the polar members having their pole faces offset in the placed from the same direction transversel of the casing, whereby the pole faces are disposed in cooperative relation with their center transversely displaced from the axis of the field coils.

4t. In an electric motor in combination with the casing, two oppositely disposed field coils having a common axis, and two opposing polar members carried by the casing, each polar member being surrounded by one of the field coils and the polar members having their pole faces similarly offset transversely and axially of the casin whereby the pole faces are concentrical y disposed in cooperative relation with their central transverse plane longitudinally disaxis of the field coils and with their axis at one side of the, axis of ,the field coils.

In testimony ofthe foregoing specification, I do hereby sign the same in the city of New York, count York, this first day 0 September, 1909.

' CHARLES H. J. DILG. Witnesses: 1

' RoBT. Sonwanz,

J; ODELL FOWLER.

concentrically and State of New

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