Tandem motor mechanism

Nov. 6, 1934.

1,^79,425

F. VAN DER WOUDE

TANDEM MOTOR MECHANISM

Filed Aug. 12, 1931

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Patented Nov. 6, 1934

1,979,425

UNITED STATES PATENT OFFICE

1,979,425

TANDEM MOTOR MECHANISM

Fritz van der Woude, Elyria, Ohio, assignor to The General Industries Company, Elyria, Ohio, a corporation of Ohio

Application August 12, 1931, Serial No. 556,526

Claims. (Cl. 172—36)

This invention relates to electric motor power delivering mechanisms.

My invention is applicable to numerous uses but I have chosen to-show and describe it in con5 nection with a motor power delivering mechanism for operating turn-tables such, for example, as the turntable of phonographs.

It is one of the objects of my invention to. provide an improved motor mechanism which will 10 be cheap to manufacture and efficient in operation.

Another object is to provide a motor mechanism composed of the minimum of parts and which parts may be assembled in a number of 15 different arrangements whereby to optionally change the contour of the mechanism as a whole to adapt it to apparatus to be driven with which it may be associated.

Another object is to provide a motor mechanism 20 in which a pair of motors may be employed to jointly drive a common power shaft such, for example, as the shaft of a turn-table and in an improved manner.

Another object is to provide an improved twin 25 motor power-delivering mechanism.

Another object is to provide an improved motordrive and mounting therefor.

Another object is to provide an improved motor-drive and lubricating system therefor.

Another object is to provide an improved vibration-proof means for mounting a motor mechanism upon a cabinet or other supporting frame.

Another object is to provide an improved 35 power-delivering mechanism adapted to be driven by electric motor power.

Other objects will be apparent to those skilled in the art to which my invention appertains.

My invention is fully disclosed in the following 40 description taken in connection with the accompanying drawing, in which:— .Fig. 1 is a front elevational partly sectional view of an embodiment of my invention;

Fig. 2 is a sectional view taken from the plane 45 2 of Fig. 1;

Fig. 3 is a top plan view taken approximately from the plane 3 of Fig. 1;

Fig. 4 is an end view taken in the direction of the arrow 4 of Fig. 1;

Fig. 5 is an end view taken in the direction of the arrow 5 of Fig. 1 ;

And Fig. 6 is a fragmentary sectional view taken from the plane 6 of Fig. 1.

Referring to the drawing, I have shown at 1 a 55 main frame comprising a central box-like hous ing 2 comprising a bottom wall 3, end walls 4 and 5, front and rear walls 6 and 7, and a removable cover 8, and comprising also upper lateral extensions 9 and 10 extending from the wall 4 and lateral extensions 11 and 12 extending from the 60 wall 5. Thus four extensions are provided on each side of the housing 2, namely two upper extensions 9 and two lower extensions 10 on one side, and two upper extensions 11 and two lower extensions 12 on the other side. The frame com- 65 prises also a pair of bearing bosses extending outwardly from the opposite side walls 4 and 5 of the housing, the bosses being provided with axially aligned bearing bores 14 and 15.

A vertical power-delivering shaft 16 is mounted 70 in the housing 2, the lower end, as viewed in Fig. 1, being of reduced diameter and rounded on the end as at 17, and disposed in a rotary bearing bore 18 in the bottom wall 3 of the housing and resting upon the square end of a plug 19 driven 75 into the end of the bore to provide a supporting and end thrust bearing for the shaft 16.

Upwardly, the shaft 16 extends through a rotary bearing bore 20 in the housing cover 8, and externally thereof has secured thereon as by a 80 set screw 21, a turntable or the like supporting head 22 surmounted by a rubber, vibration-absorbing washer 23.

When my invention is employed to drive the turntable of a phonograph, the turntable may 85 rest upon the washer 23 and vibration which would otherwise be transmitted to the turntable is absorbed in the washer 23.

To prevent undue upward axial movement of the shaft 16, I provide the following means. A 90 groove 24 is turned in the shaft adjacent the under side of the cover 8; a U -shaped key 25 is straddled around the shaft in the groove, and a dishshaped washer 26 having a perforation in its bottom is telescoped over the shaft and with the 95 flange of the disc enclosing the key 25. End movements of the shaft 16 are thus stopped by the key and the disc 26 prevents accidental removing of the key. Upward end thrust of the shaft is thus received on the cover 8 and thus a 100 simple and efficient means is provided for what in effect is a collar of relatively large diameter on the shaft 16.

Adjacent the lower end of the shaft 16 is a gear 27, preferably of fiber or other composition 105 material, press-fitted upon splines 28 to rigidly mount it on the shaft 16.

A motor shaft 29 is disposed in the bearing bores 14 and 15 and upon a portion thereof within the housing 2 has formed a worm thread 30 ¹¹⁰

1,979,425 which is meshed with the teeth of the gear 27. The shaft 29 extends outwardly beyond both of the bearing bosses 13—13 and on one end has rigidly mounted the armature 31 of an electric 5 motor. On or adjacent the opposite end, another identical or similar armature 32 is mounted. The armature 31 may be press-fitted onto the shaft 29. Preferably the armature 32 is constructed with a central sleeve 33 telescoped upon the shaft 10 and the armature is rigidly secured to the shaft by a set screw 34 in the sleeve.

Thus in assembling the motor mechanism, the end of the shaft which supports the armature 32 may be passed through the. bearing bores 14 and 15 15 successively and then the armature 32 telescoped thereon and secured thereto by the said screw 34.

Rotation of the armatures 31 and 32 which rotate the shaft 29 as will be understood, rotate 20 the worm 30 in the direction to cause it to react and thrust the shaft 29 toward the end wall; 4 of the housing. To absorb this end thrust, a sleeve 35 is secured on the shaft 29 in the housing 2 by a set screw 36, the thrust thus being 25' transferred to the inner face of the wail 4 of the housing.

A field construction or stator for the armature 31 is provided comprising a pile of laminations 37 of the usual configuration and energizing 30 windings 38 therefor, four of such windings 38 being provided and encircling suitable field poles 39__39.

The field construction 37 as a unit is secured to the extension 9 and 10 by screws or bolts 40—40 35' ^projected through suitable aligned perforations in the laminations composing the field and screwed into threaded recesses in the ends of the extentions as, for example, at 41, Fig. 3.

An end cover of sheet metal may be provided 40' to cover the end of the motor and may be pressed from sheet metal. Preferably the cover 42 comprises a body portion 43 generally of circular form and a flanged face 44 generally rectangular to conform to the cross-sectional, shape of the 45, field 37,. and the screws or bolts 40 may be projected through perforations 45 in the flange 44 whereby the screws may secure the cover 42. on the field. If desired, two, preferably diagonal perforations 45, may be enlarged to telescope over 50 the heads of the screws or bolts 40. Thus two of the screws 40 may be left at all times tightly drawn up to permanently hold the field on the frame, and the other two screws may be removed when it is desired to remove the cover 42 55 for any purpose.

The cover may be provided in the body portion 43 thereof with ventilation perforations 46—46.

A field 47 is provided for the armature 32,. generally of the same construction as the field 60 37, and having a plurality such as four energizing windings 48 thereon. The field 47 is rigidly mounted upon the ends of the extensions 11 and 12 by double-ended studs having a head portion. 49 of hexagon or other wrench-engageable form 65 and a shank portion 50 projected through holesor bores in the field and into threaded recesses as at 48 in the ends of the extensions and hav-: ing a short shank portion 51 extending outwardly from the head 49 for a purpose to be described. 70 The shaft 29 extends outwardly beyond the armature or rotor 32 and is associated with a speed governing device of the friction type. The governing device may be of any known or suitable construction but I prefer to employ a gov75 erning device such as shown and described in complete detail in my copending application, Serial No. 556,527, filed August 12,1931, patented Nov. 28, 1933, No. 1,936,924. This governing device comprises a disc 53 supported on a sleeve 54 which is telescoped upon the free end of the 80 shaft 29. A centrifugal device shown generally at 55 operates, upon rotation of the shaft 29, to move the disc 53 in the direction away from the rotor 32 by sliding the sleeve 54 on the shaft. A stationary friction annulus 56 of felt or like 85 friction material is supported in a cup 57 secured by its bottom portion to a fiat spring 58 mounted upon an end wall 59 of a housing to be more fully described. A ball 60, lodged in a suitable recess 61 in the wall 59 of the housing, is adapted Θ0 to be moved axially inwardly by a cam 62 to move the cup 57 and annulus 56 to adjustably vary the friction on the plate 53; and to be moved outwardly by retraction of the spring 58 upon movement of the cam 62 to release its pressure 95 on the ball 60. Thus by means of the cam 62 the governing friction may be regulated, to. vary the governing speed. The cam. 62 is in. the form of an eccentric the periphery of which engages the ball 60, the eccentric being mounted upon joo a shaft 63 mounted in. bearings 64 and 65 on the end wall 59 of the housing, and. terminating at the end opposite the cam 62. in a lever handle 66· having at its end a pointer 67 adapted to engage with, a scale not shown to indicate the: adjust-· 195 ment of the governor.

The above-mentioned end wall 59 of the housing has formed therewith a plurality such as four arms 68—68 extending inwardly toward the rotor 32 and terminating in feet 69·—69 which have, jjq perforations therein suitable to be telescoped over the shank 51—51 of the studs 50.·,. whereupon, nuts 70 may be screwed on the shank to clamp/ the feet upon the stud head 49· and thus rigidly mount the governor housing in position. jjjj

Preferably the shaft 63 extends upwardly parallel to the power shaft 16 and is pressed, upwardly with the cam 62 engaging the lowerend of the bearing 64 by a compression spring 71 reacting against· the upper end of the bearing vjq and against a cotter or other pin 72 projected through the shaft 63.

For mounting the motor units above described upon the wall of a cabinet or other supporting, frame, the following means is provided.

Studs 80 having each a shank 81, a head 82. and a flange 83 superposed on the head 82 are provided and projected downwardly as shown in Fig. 1 through suitable bores in the extensions 9—9 and 11—11, the shanks 81 extending through, the bores and on the under sides of the extensions having each a nut 84 for securing them rigidly in position. A cylindrical block, of rubber 85 has formed in its opposite ends recesses, generally circular around the axis of the cylin- -75 der, and in cross-section of T-shape. The Tshaped recess in one end is forced over the flange 83 of the stud 80, the dimensions and proportions· of the recess being such as to substantially fit with constricting tension the head 82 and flange 83 of the stud. Thus the flange 83 is interlocked with the material of the rubber block 85. Into the T-shaped recess in the opposite end of the block, a stud 86 having a shank 89, and having a head 87 and flange 88 similar to or iden- ., ₄-. tical with the head 82 and the flange 83 of the. stud 80, is interlocked with the block 85 by forceably inserting the flange 88 and head 87 into the T-shaped recess of the block. The shank 89 of the stud 86 is, or may be, thus axially aligned

1,979,425 with the shank 81 of the stud 80. The block 85 is thus firmly secured to the extension and the stud 86 is secured to the block 85. The studs 89 may be inserted through suitable perforations in a wall of a cabinet or like supporting frame and nuts may be applied to the ends of the studs and the entire motor unit above described may thus be secured or connected to the panel, the connection being through the rubber blocks 85, and With a supporting connection of this kind, all vibration in the motor unit will be absorbed in the blocks 85 and not transmitted to the studs 86 nor to the cabinet wall to which they are secured.

A portion of a cabinet wall is indicated at 90 in connection with one of the studs 86 in Fig. 1, where as shown, the cabinet wall 90 may be securely clamped between a nut 91 on the stud and the head 87 of the stud.

In order to lubricate the gears 27 and 30 and the shaft 29 in the bearing bores 14 and 15, lubricant may be supplied to partially fill the housing 2. Lubricant will work its way out along the shaft 29 into both bearing bores to lubricate the same and any excess will be returned into the housing or chamber 3 thereof by the action of a right-hand spiral groove 100, Fig. 2, cut in the shaft and disposed thereon within the bearing bore 15, and a corresponding left-hand groove 101 cut in the shaft where it rotates in the bore 14. Thus lubricant is supplied continuously and automatically to the wearing parts including the thrust bearing 17—18—19 above described.

Lubricant may be conveniently supplied through a tube 102 depending downwardly into the chamber 3 from the cover 8, the upper end of the tube providing an orifice in which the lubricant such as oil may be admitted to the chamber 3. By terminating the tube 102 at a point above the level of lubricant in the chamber, the lubricant is prevented from running out of the chamber or leaking out therefrom in the event that the entire motor unit is turned up-sidedown as, for example, during transportation.

By disposing the shaft 63 of the governing mechanism parallel to the shaft 16 of the turntable head, the regulating lever 66 will conveniently be disposed on the upper side of the same panel or frame element above which the turntable rotates.

It is sometimes desirable to manufacture powerdelivering units of the above described type for the manufacturers of the apparatus to be driven thereby. The driven apparatus, designed and made by different manufacturers, may differ so much in arrangement and design that different arrangements of the power unit may be necessary to properly fit Into the driven apparatus.

It is one of the important advantages of my invention that the parts of which the power unit is composed may be assembled in different arrangements, whereby variously arranged power units may be assembled from a single set of parts, thus making it possible to manufacture the parts in great quantities which tends to cheaper production of the finally assembled various units.

In carrying out this idea, it will be observed that the entire governing .mechanism which is shown on one end of the unit may be taken off and put on the other end of the unit and correspondingly the cover plate 42 on the said other end may be taken off and put on the end occupied by the governing mechanism in the drawing.

In this connection, it is only necessary to assemble the shaft 29 and the armatures in the reverse direction, that is to say, positionally turned through 180°.

Again, by supporting the unit on four studs 86, the said studs may be equally spaced and thus the unit may be secured to the panel of the 80 driven apparatus in any one of four different positions around an imaginary axis within the square described by the studs; thus positioning the governing lever 66 in any one of four optional positions. 85

Again, by disposing the shaft of the turntable, 16, within the square described by the studs 86 asymmetrically thereto, the greater volume of the unit may be disposed at one side or the other of the shaft 16 by rotating the entire unit 90 through 180°.

Again, by employing two similar or twin motors, comprising the fields and armatures or rotors above described, a predesired amount of power may be delivered from a unit which is 95 of relatively small dimension in the direction transverse to the axis of the motor; and furthermore, parts of the unit such as the fields, armatures, windings, etc., may be employed which are also available for use in other types of power- 100 delivering units employing only a single motor of the same size.

My invention is not limited to the exact details of construction shown and described. Many changes and modifications may be made 105 within the scope and spirit of my invention without sacrificing its advantages.