US 1806341 A
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May 1.9.', 1931. G, V, GAVAZA 1,806,341
CUSHION Filed Jan. 8.' 1929 IlllIn-IIIIIW atentecl May 119i, 1931 UNITED STATES PATENT oFFlcE GEORGE v. GAVAZA, or Quincy, MASSACHUSETTS CUSHION Application filed January 8, 1929. Serial No. 331,062.
The present invention relates to cushions, and more particularly to cushions which are used to cushion machines or articles mounted on legs, casters or feet.
In many households, machines driven by motors are used in sewing, in washing clothes and dishes, in refrigeration and in spraying oil in furnaces. An annoying feature of these machines is the noise they make in operation. This noise is due principally, to the transmission of the vibrations of the machines to the surfaces upon which the machines are supported. To absorb the vibrations of motor-driven household machines and thus render them noiseless it has been proposed heretofore to cushion the machines with a body formed of elastic material having a pocket in its top face in which the leg or caster of the machine is supported and having in its 2o bottom face both an annular recess for causing the cushion to grip a supporting surface and a central air-pocket for absorbing the vibrations of the machine. Some of the motor-driven household machines are heavy and their vibrations are intense. In consequence the cushion is subjected to a pulsating load.
When the load surges downwardly the material over the central air pocket is distorted thus decreasing the volume of air therein 3o and forcing some of the air out of the pocket into the annular recess. When the load surges upwardly again this air is trapped in the annular recess thus increasing the pressure therein. This transfer and trapping of air is repeated as the load pulsates until the pressure in the annular recess is great enough to raise the external wall adjacent the annular recess from Contact with the supporting surface and the air is dissipated. When this occurs the central air pocket is flattened so that the vibrations of the machine are transmitted directly to the supporting surface.
The object of the present invention is to provide a cushion for motor-driven household machines which will absorb effectively their vibrations.
To the accomplishment of this object, and such others as may hereinafter appear, the various features of the present invention relate to certain devices, combinations and 'arrangements of parts as full)7 set forth herenafter, the advantages of which will be readilyunderstood by those skilled in the art.
The various features of the present invenI tion will be readily understood from an inspection of the accompanying drawings illustrating the best form of the invention at present known to the inventor, in which,
Figure l is a view in perspective of the cushion; y
Fig. 2 is a view in bottom plan, and
Fig. 3 is a view in central sectional elevation on the line 3-3, Fig. 2. t
Referring to the drawings the cushion comprises a frusto-conical bodye, of elastic material suchas rubber or a compound thereof having a small base 5 and a larger base 6.` On the base 5 a pocket 7 is formed which is.Y separated from' the conical surface of the body by an annular wall 8. rlhe pocket 7` receives therein the leg, foot or caster of the motor-driven household machine. The larger base 6 is provided with an annular recess 9 for causing the cushion to grip a supporting surface. The recess 9 is separated from the conical surface of the body l by an annular wall 10.' Centrally located on the larger base 6 is an air pocket ll which is separated from the annular recess 9 by an annular wall l2. The wall l2 is provided with three openings 13 therethrough.
In use'the material of the cushion between the pocket? andair-pocket l1 yields under the vibrations of the supported machine, thus compressingthe air in the air-pocket ll, the recess 9 and the intercommunicating passagesr 13. The compressed air absorbs the vibrations of the machine and prevents the transmission of the vibrations to the surface upon which the larger base 6 rests. Because of the passages 13` between the annular recess 9 and the air pocket l1 a pressure'is not built up in the recess 9 but the air surges backand forth, under the influence of the pulsating load, between the recess 9 and the pocket ll and the pressure in the recess 9 is never great enoughto raise the wall 1 0 from Contact with the supporting surface. With this construction thew'all-l2 provides an additional support for the load thus preventing undue distortion, This provision for increasing the volume of air subjected to` compression prevents the air from attaining as high a com-` pression as the air attains When conliined Within the air-pocket alone. With the pres' ent construction the vibrations ofheavy -mafchines arefabsorbed Without distorti-ngith@ inner Wall 12. Consequently the vibrations 10 are absorbed lWithout dissipating the air in the recess 9, pocket IOandpassag's '13.
The cushion ismade rusto-conical, pref-V v erably, to avoid top-heaviness in the cuislflio'nv and to enable the annularl recess-Qtdgripga 15 large v area of the supporting surface.v v
" While'the' invention has been .described as being particularly usefulin' supporting; vmol toredrivenhousehold machines it will belip' l parent to' tho's'efskille'd in thejart thatvthe l 2g-cushifon may be used in supporting other household articles such for instance as musi;` cal instrumentsand batteryichargers .to .im-- prove the tone in vthe case'of the"V musical .in` Q f cstrI im'ents'v and totobviate the noise in thecase '25Mof'batteryphargerar The cushions are useful particularly vin supporting radio sets asithey` f act as Hoor ll'evelersv ,and veliminate tube 'vii- 'br'ation anddisto'rition lcaused by passing traiicor byV Walking and dancing fthe ae-building`1vvhere v"the lset islocated.l ,VV-hat isfcl'aimed as new, isz"V s 1 i Y ,ii j ushon for [motor-driven. household:
'macl-iines,` radio sets and 1`nusicaliis'tr'u-` 'mentsl'cmprisir'g a bodyiformed oiz'e'lastiev Whiclithe leg or caster of vthe machineis' Vslip'portedfand having in its bottoni-faeean s annu-lar *recessfor'v causingv the cushio'nfto grip 'a vsnpporting surface'and a central airs' 40' pocketl communicating with the recess fior absorbing the vibrations ofthe machine. v 1
2; cushionV for motor-'driven household machines, radiov setsy and ,musical instru-f ini'its'V f'coi'nprisingav rustosconicalfl body 45 ormedfof elasticmaterial having a'poclet initsjsmaller bassin Which-the' leg or caster'of the machine supported and having! iii-fits p larger'base'fan annular recess'for causing Jthe v Y cushio'nto grip-a supportingfsurfaee and-a i 5e' 'ceiitralfaifr-po'cket Ycommu'nicating with therecess or'absorbingfthe vibrationsl 'offline 1 maehine: f p i '3;' cushionor motor driven Yhousehold machines,-`j radio sets andmusicalg instrii- 535 ments Arx'nmprising a body formedf wif elastic" material having a pocket-in its'top 'face v whichthelegor'caster of the'maehineissup Y ported-fand 'having in liLSf'bOi'irUIil4 faci WO- 1 annular concentric Walls, thevinner vvall'hfav` e0' ing openings therethrough, said' walls'beiig separated by a recess, Aar'dfai'i fair-pocket i oifinedwithin'theinner wall. Y:In testimony' whereofl have signedimy n'ineto`*this-specication