US1798846A - Supporting means for electric motors - Google Patents

Description

March 31, 1931. c. L. KENNEDY 1,793,846

SUPPORTING MEANS FOR ELECTRIC MOTORS Filed May 6, 1926 W/M vW Patented Mar. 31, 1931 I UNITED STATES PATENT OFFICE CARLTON L. KENNEDY, 0F BRAINTREE, MASSACHUSETTS, ASSIGNOR TO THE HOLTZER- CAIBOT ELECTRIC COMPANY, OF ROXBURY, MQSSACHUSETTS, A CORPORATION OF MASSACHUSETTS SUPPORTING MEANS FOR ELECTRIC MOTORS Application filed May 6, 1926.

The present invention relates to an improvement in supporting means for electric motors, and more particularly to variable torque motors.

Electric motors of the single phase type produce a pulsating torque which causes a rotational vibration which is transmitted to any resonant support to which the motor may be attached, causing the latter to emit a sound or noise which for certain uses, is objectionable. It has been proposed to interpose resilient means such as rubber or felt between the motor and the support to which it is at tached, where the noise or sound is objectionable. These flexible methods of mounting, however, have permitted movements of the motor under the stress of driving deflection such as belt pull or gear resistance.

The object of the present invention is to produce a construction which will not only absorb the rotational vibrations of variable torque motors, but which also will support the motor with sufficient rigidity to prevent driving deflection due to belt pull or gear resistance. To this end the invention consists in the motor support hereinafter described and particularly defined in the claims.

In the accompanying drawings illustrating a preferred form of the invention, Fig. 1 is an end view of the motor and its support; and Fig. 2 is a front elevation of the same.

The illustrated embodiment of the invention is described as follows: The frame or base of the motor support consists of a plate 10 having bars 12 secured thereto at opposite ends. These bars have upturned ends 14 to which resilient arms 16 are secured. These arms extend from opposite sides of the base toward the axis of the rotor shaft 18 of the motor 20. The arms 16 are secured to the ends 14 of the bar 12 by means of the screws 22, and the other ends of. the arms are secured to the varying portions of the frame of the motor by similar screws 24. These arms 16 are made of ribbon steel such as clock spring steel, and they lie in the plane of the axis of the motor rotor. They thereby prevent endwise movement of the motor while permitting rotational vibrations of the m0- tor. The arms 16, being arranged in the 'means of bolts or screws Serial No. 107,240.

form of a truss comprising thebase and the arms, and having sufficient flexural strength to prevent buckling under the stresses of driving deflection, support the motor against the stresses of belt pull or gear resistance while at the same time permitting the vibrations of the motor due to any inequalities of torque. They therefore absorb such torque vibrations and prevent the emission of sound or noise by the body by which the base of the supporting means is carried. The base 10 of the supporting means is adapted to be secured to the body to which it isattached by which pass through the holes 26 of the base.

It is to be observed that this supporting means is adapted to carry the motor with the base in any position with respect thereto. Thebase may be supported upon the floor, ceiling, side wall or inclined support, and the shaft may be horizontal or vertical. The arms 16 may be made of any resilient metal or other material of suflicient rigidity and elasticity to afford substantially rigid support of the motor against the stresses tending to driving deflection, while permitting rotational vibrations. be made of various widths, and in a case where the arms are substantially as Wide as the length of the motor, two arms would be sufficient for its adequate support. The minimum number of arms is obviously two, as without such number a formed, but a considerable number of arms may be employed if desired. When a large number is employed, the flexural strength of the individual arms will be reduced, but in all cases the arms must be arranged with their resilient portions lying in directions radial to the axis of the rotor or the center of inertia of the motor.

The arms may a truss would not be.

not necessarily fiat, as a number of arms of symmetrical transverse section may be employed side by side in place of a single fiat arm, a plurality of such arms having all the qualities of the flat arms'shown in the drawings.

Having thus described the invention, what is claimed 1s:

1. A variable tor ue electric motor and support having in com ination, a motor, a frame and resilient arms of sheet material rigidly attached to the frame and extended toward the rotor axis of the motor and rigidly secured thereto with planes of the arms intersecting the axis of the motor rotor to hold the motor from movement tor axis, said arms being extended upwardly and inwardly and arranged at an angle to each other so that they form a truss to support the motor against substantial bodily movement and being springy as to permit rotational vibrations due to variations of motor torque without transmission thereof to the frame.

2. A variable torque electric motor and support having, in combination, a motor, a frame, a pair of arms of flat flexible metal rigidly secured to the frame and extended angularly upward toward each other on lines intersecting at the axis ofthe motor rotor rigidly secured to one end of the motor, and a similar pair of arms at the other end of the motor similarly arranged with respect to the rotor axis and similarly connected to the frame and the motor.

In testimony whereof name to this specification.

CARLTON L.' KENNEDY.

axially of the mov I have signed my

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