US1678999A

US1678999A - Motor mounting

Info

Publication number: US1678999A
Application number: US674907A
Authority: US
Inventors: Henry H Murray
Original assignee: Victor Talking Machine Co
Current assignee: Victor Talking Machine Co
Priority date: 1923-11-15
Filing date: 1923-11-15
Publication date: 1928-07-31
Anticipated expiration: 1945-07-31

Description

July 3l, 1928.

H. H. MURRAY MOTOR MOUNTING Filed Nov. 15, 192s 2 sheets-sheet l l 0 a" g 1 7**610 K if .null-n ||||||||||||||||||||||||l|||||||||||l :n .v j

4 /N VEN To? nl? 15,7 .Marra j w/ r/vsss v er f a pdrowys 2 Sheets-Sheet 2 H. H. MURRAY MOTOR MOUNTING lFiled NOV. l5, 1925 July 3l, 1928.

WITNESS Patented iluly 31, 19.28.v

UNITED STATES PATENT OFFICE.

HENRY H. MURRAY, F RIVEBTON, NEW JERSEY, ASSIGNOR TO VICTOR TALKING MACHINE COMPANY, A CORPORATION 0F NEW JERSEY.

-Moron.' MOUNTING.

Y Application filed November 15, 1923. Serial No. 674,907.

My invention relates to lnountings upon which motors are supported, and more p arti'cularly to vthat type or kind of mounting wherein the motor' is yieldingly supported,

with a view of reducing or entirely ellminating motor noises which are frequently disturbing,` distracting and altogether ob]ec tionable particularly when the motor 1s employed to Aoperate amusical instrument. Mo-

tors for operating musical instruments, such as talking machines, generally operate comparatively quietly, so far as any audible sounds are concerned, but since certain parts of such motorsusually rotate at relatively 15 high speeds there is generally some slight sound produced due to the engagement of the gearing therein and to vibration of the Vmotor occasioned probably lby some unbal-A anced portion of the rapidly moving parts. But such motors arev usually comparatively rigidly mounted and secured to a motorboard or to a partition or wall of the cabinet in which the motor is housed and these slight 'noises and the vibrations of the motor are thus directly conducted or transmitted to a Wall of a morel or less sound-resonant chamber, where they are considerably amplified or augmented,`often to such an extent as to divert attention 'from the musical selection being reproduced by a motor driven instrument. I The object of myinvention is to provide a mounting for such a motor which will permit the motor as a whole/to vibrate slightly, While` running, without transmitting those vibrations to any part of the cabinet structure or motor-board, and to confine those vibrations to the motor structure itself with the result that the vibration of the motor may produce no audible sound.

A further object of my inventionis to actually reduce the motor noises by s up porting the motor structure upon reslllent springs, so that the motor mechanism 1s yieldingly or floatingly mounted with respect to the main support therefor and may vibrate, within narrow limlts, without actual contact with any rigid relatively unyielding resonant structuresv v placed therefrom during shipment, and at A further object of my invention is to` the same time to positively prevent any drect contact or' engagement of the motor mechanism with any rigid part of the structure in or o n which it may be mounted.'

A further object is to sound-insulate the support, which may be a motor-board, from the motor and from the rods by which the motor is mounted on the motor-board, and to sound-insulate the motor-frame from said rods and from said support so that there is no continuous rigid metallic connection or Contact between said parts.

A further object of my invention is to so mount the motor with-respect to its suppbrt that the entire Weight of the motor is carriedand balanced by resilient springs under compression which is due only to the Weight of the motorframe and the parts carried thereby, said motor when being operated being normally out of contact or engagement with said support or any other object except said springs, so that it is free to vibrate and to.` move slightly i-n any direction unrestrained in any I nanner except by the resiliency of said springs on which it rests and gravity. 1

Other objects of my invention will appear in the yspecification'and claim below.

Referring nowto the drawings, formin a part of this specification', and'in which the 35 sa'me reference characters vare emplo ed throughout to designate the same parts, ig-

ure lis a side elevationalview of a talking V machine motor secured to a motor-board of a talking machine cabinet, which board is sectionalv on a vertical plane passing through the-talking machine spindle, said motor being yieldingly or flgoatingly mounted on said board or support in accordance with my invention. Fig. 2 is a plan View of the v95 bottom side of the motor shown in Fig. 1 and of the three-point yielding mounting therefor. f

Fig. 3 is a vertical sectional view on a somewhat larger scale than that of Figs. 1 100 and 2 of one ofthe yielding vibration-absorbing sound-insulating,supports for a motor, all the parts .being in vertical section` except the central rod or bolt, vwhich isv shown in elevation; and

Fig. 4 is a side elevational view'of. the,y structure shown in Fig. 3.

In Figs. 1' and 2 there is shown a motor 1 which may be of any type or form so lon as it comprises a rigid motor-frame 2, vvhic is usually of a rigid cast or assembled metal construction. On this motor-frame may be mounted the spring-barrel or other power element 3, the gearing 4, the spindle 5 and the governing mechanism 6. Thismotor 1 is shown as mounted on the support 7, which may be a motor-board or a partition or wall `of a talking machine cabinet or any relatively rigid support for any motor, the noises ofwhich it is desirable to reduce to a minimum. For convenience I will hereinafter in the detailed description refer to this support 7 as a motor-board.

In the particular structure shown in Figs. 1 and 2this motor 1 is directly supported on compression springs 8. preferably three in number, the lower ends'of said springs being supported by bolts or rods 9 passing through the motor-board or support and the motor frame. rIhe general arrangement and disposition of these three spring supports is plainly shown in Fig. 2.

These three spring Supports are all alike and for a detailed description thereof reference will now be had to Figs. 3 and 4,. The rod 9 is preferably a bolt or screw having on its upper end a head 10 and having its lower end provided with screw-threads 11 over which may be threaded a nut 12 and a lock nut 13. Thesupport or motorboard 7 is preferably provided with a cylindrical hole 14 passing lvertically therethrough, into which is snugly fitted a bushing 15 of any suitable yieldingnon-metallic sound-insulating material such as soft rubber. The inside diameter of the bore of this bushing 15 is preferably substantially the same as the diameter of the rod or .bolt 9 so that the said rod fits snugly in this soft yielding bushing. Under the head 10 of the rod 9 I may provide a light steel washer 16 and between it and the upper side of the support on the motor-board 7, I provide a washer 17 which is also of yielding non=metallic sound-insulating material, such as felt. In this way the bolt or rod9 is completely sound-insulated from the support 7 but is not rigidly mounted therein, the lower end of the bolt being slightly movable transversely, against the resistance of the yielding resilient bushing 15. y

The motor-frame 2 is provided with three holes 1'8 adapted to aline with the three holes 14 in the support 7 and it is through these holes that the bolts 9 freely pass.

Referring again to 3, hole 18 is preferably provided or lined with a bushing 19 of yielding non-metallic sound-insulating material, such as soft rubber, and is shown as frictionally retained thereinby fitting snugly into the hole 18. The bore or hole through this bushing 19 is preferably substantially larger than the diameter of the bolt 9 passing therethrough," so that the bolt 9 may normally be just out of Contact with 'to the springs 8.

the interior of the bushing 19. The lower end 20 of this bushing 19 preferably extends beyond or below the motor-frame 2 in the space between the bolt 9 and the upper end of the compression spring to prevent the upper end of said spring from being slipped' transversely into direct contact or engagement with the bolt 9. The lower end of the spring 8 preferably rests upon a steel bushing 21 'projecting into the space between the lower end of the spring 8 and the bolt 9 and having on its lower end a circular flange 22 adapted to rest squarely on the nut 12. Between the support 7 and the mo'tor-frame 2 and preferably surrounding the bolt 9, I may insert a pad, ring or washer 23 of yielding non-metallic sound-insulating material, such as felt, so that no actual Contact or engagement of the inotor-fra1ne 2 with the support 7 is possible.Y Preferably this felt washer 23 rests onor is secured to the side of the motor-frame 2 adjacent the support 7,

but it may be secured to the support 7 and spaced from the motor-frame. 'lhe nut 12 is so adjusted that the upper surface of the washer' 23 is normally out of engagement with the under side of the support 7.

By reason of this construction the motorframe and the parts carried thereby are supported on a plurality of compression springs 8. Then the motor is running the motorframe as av whole may freely move or vibrate slightly on these springs without communicating that motion to the rods 9 or to the support 7. The motor-frame may vibrate in any direction without transmitting such motion tb any part of the structure except Because yielding nonmetallic sound-insulating material is interposed between the bolt head 10 and the supportl 7; between the shank of the bolt 9 and, the support 7 between the support 7 and the motor-frame 2; between the motor-frame 2 and the bolt 9; and between the upper ends of the springs 8 andthe bolts 9, there can be no direct contact or engagement between the bolts 9 and the support 7 4or between. the bolts 9 and the motor-frame 2, or between the motor-frame and the support 7, and no vibration or movement ofthe motor or sound produced'by the operation of the motor is transmitted or conveyed by any solld sound-conductive part to the support lor motor-board or to any wall or any partition of any chamber of a. talking machine structure.

As a result of this, any motor noises arey 'substantially eliminated, and if such a motor 1s used in a talking machine struc-ture there are no motor noises produced which will reach the ear of one listening to the reproduction of sound from the talking machine.

It is to be understood that the nuts 12 are not for the purpose of compressing the felt washer 23 between the support 7 and the g resiliency of the springs as distinguished from elongating orl extending them, said weight being balanced by the tension of the springs.

Vhen the motor is properly positioned, that is to say, so resting that the support 7 is substantially horizontal, there should be a free space between the felt washer 23 and the under side of the support so that there will he no actual contact between the motorrame 2 and the parts carried thereby, andv the support or motor-board 7 and the parts carried thereby. Under these conditions, the rods or bolts 9 should also be just out of contact or engagement with the bore of the iexible bushings 19 so that there will be a clearance or slight space between them. When so constructed and positioned, the entire weight of the motor-frame 2 and the parts carried thereby will be carried and balanced by the resilient springs 8 and the motor-frame and the motor mechanism mounted therein will be out of 'actual contact or engagement with thesupport 7 and the rods 9 or any other object and will be free to move slightly or vibrate in any 'direction unrestrained by anything except the springs 8 upon which the weight of the motor is carried and gravity.

While I have describedwith considerable particularity the exact structure illustrated in the drawings forming a part lof this specification, I .do not wish to be construed as being limited strictly thereto, inasmuch as many slight changes might be made therein without departing from they spirit and scope of my invention as set forth inthe appended claim.

Having thus described my invention, I claim and desire to protect by Letters Patent of the United States:

The combination with a. motor-support and a motor comprising a rigid motorframe, of a plurality of rigid rods mounted on said support and projecting therefrom, metallic compression springs supported at their lower ends by said rods and surrounding but spaced from. said rods land upon the upper ends of which said balanced, said frame being pro `ded with a plurality of openings through which said rods respectively pass, yielding, sound-insulating material between said rods and said 'support to pre-vent any actual contact of said rods with said support and to permit said rods to yield slightly with respect to said support, and bushings of yielding, sound-insulating' material openings in said motor-frame,`each bushing having a bore therethrough of a diameter substantially ,larger than the diameter of the rod passing therethrough and projecting beyond said motor-frame into the space between a spring and arod whereby said motor fra-me is free to slightly move and vibrate in any direction with respect to said rods and with respect `to said support unrestrained except by the resiliency of said springs and gravi y.

In witness whereof, I have hereunto se! my hand this 13th day of November, 1923 HENRY H. MURRAY.

motor-frame rests and by which the weight of said motor is fitted into said