US1564758A - Typewriting-machine-cushioning foot - Google Patents

Description

M. c. cRAwLEY TYPEWRIHNG MAHINE cmsHIQNINGz v.F901 1 Filed July 25', 1922 V TOR BY 'ATTORNEYS 6 Hum Planted Dsc. s, i925.

UNITED STATES `1,564358- PATENT oFFicE.

mslm!) C. ORAWLEY, OF GBOTON, NEW YORK, ASSIGNOB TO ADDOGBAPH OOK- PANY, OF LOS ANGELES, CALIFORNIA, A CORPORATION Ol' CALIFORNIA.

' TYPEWBITING-HACHINE-OUBHIONING FOOT.

Application tiled July 25, 1922. Serial No. 577,383.

To a whom t may concem:

Be it known that I, MANsFinw C. Caswmzr, a citizen of the United States, and resident of Groton, in the county of Tom kins and State of New York, have invente certain new and useful Improvements in Typewritin -Machine-Cushioning Feet (case No.

), o which the following is a specification.

This invention has special reference to ty writing machines in that it is especially clicicious, when yused on those machines, in

destroying the vibrations and noise resulting from the operation of the machine; but l5 it will be understood that the invention is applicable to other machines in which it is desirable to accomplish the same purpose.

In the drawing annexed, Fig. 1-is aside elevation of one corner of a typewmting. ma-

90 chine frame having one of my cushion feet attached thereto; v Fig. 2 is a vertical sectional view of the same;

Fig. 3 is a bottom view of the saine;

25 Fig. 4 is a sectional view on the line 4 4 of Fig. 2, looking upward; and

Fig. 5 1s a perspective view of the rubber pad and its cap plate, the two parts being se arated for better illustration.

eferring to the various parts by reference characters, 10 designates a part of a typewriting machine frame, the under side of which is provided with a cylindrical pocket, up into which extends the upper en'd 85 of a coil spring 11. The lower en of this coil spring presses against ,a cap plate 12 having a central upstanding circular lug- 13 which fits within the lower end of the spring and tends toy center the same with reference to the aforesaid cylindrical pocket in the machine frame.

This cap eplate has a marginal, downwardly-turn flange 14 which forms a cuplike receptacle :for a soft rubber padv block 4s 15, the upper end of this pad block fitting tightly within the flange 14 and abutting against the under side of the body of the cap p ate, At veach side of the central lug 13 the ca 'plate is provided with a` hole, and

5o the ru ber pad is provided' with a registering hole and-through these registering holes is passed upwardlyV a'screw 16 -whose upper end is into the machine frame at a point y adjacent-to theella the lower'end of the-screw being .provided with a -head which is housedA in a ocket 17 formed in the under side of the ru ber pad, said head engaging the bottom surface of the pocket so as to thereby prevent the pad and its cap plate from being'pushed off the end of the screw by the action of the spring 11. It will be observed that the ressure of the spring 11 against the cap p ate forces the ad against the heads of the screws, these hea s serving, therefore, to restrict the downward limited movement of the pad. These two screws also serve to prevent the pad from having a rotative action, thereb insuring the centering of the lug. 13 withI reference to the spring-pocket in the frame. The pockets 17 vare made suliciently deep topermit a considerable compression of the pad and spring without bringing the heads of the screws into contact with the support on which the machine rests. v

In actual tests I have found .that the use of a metallic coil sprin in combination with a support-engaging ru ber pad is very efficacious in dissipatin the usual vibrations and sounds produced y the operation of a typewriting machine, the rubber pad serving to almost completely dissipate whatever sounds and noises may be transmitted through the sprin to the cap plate of the pad. It will be ogbserved also that by the use ofa metallic coil spring to take up what' might be called the primary vibrations, deterioration of the rubber pad (which, of course, is inevitable) will not materially aiect the eiciency of my device as a sound deadener. It will be observed thatA the tension of the sprin 11 may be readilyadjusted by adjusting e screws 16 in the A frame. It 'will be observed also that it is desirable that the screw'4 holes inthe cap plate 12 shall be slightly larger than the y screws, in order toavoid a scraping contact therewith, and further that the screw holes vin the pad shall be sli htly smaller than the screws so that the pa will firmly asp the screws and thus avoid lateral oscil ations of I the machine frame, .except .such as result' from yieldin ofthe pad. Y.

The leng'tg of serewsl and spring *11, and the of .said spring, are such that the 'loWr-*dge fof the frame vis normally yieldahly maintainedy'well above the top of cap plate. 12., as shwnpiifrlfiga lhla'nd 2.

considerable' compressionff L the spring"witl iout the frame strikingthe" i'l'o recesses formin cap plate, whereby violent shocks in handling or transportation of the machine will be absorbed and the typewriter mechanism` stantially deeper than the thickness of the screw heads and the up er walls of the cushion a utments adapted to be engaged y the screw heads to limit upward movement of the frame relatively to the foot, a metal cap attached to the upper end of the foot having a central pro]ec tion in register with the recess 1n sa1d frame and apertures adjacent said\ pro]ect1on through which the screw Shanks extend, and

an upright coiled springhaving its upper end seated in the recess in theframe and its lower end seated on the cap andv sur# rounding the projection and normally supporting the frame above the cap with the heads of the screws above the bottom of the foot.

' 2. In a typewriting machine the combination of a main frame, a rubber support- `ing foot for the frame having a pair of sockets in its lower face and a pair of vertical passa es leading from said sockets 'to the up er ace of the foot, a metal top plate secured) on the upper end of the foot, an

. of the upstanding coil s ring seated on said .plate and engagin wit the frame at its upper end, a pair o rigid vertical members depending from the frame and secured thereto at their upper ends, said members extending 4b down t rough the passages in the foot in sliding frictional engagement with the -walls passagesl and provided at their lower ends with heads normally disposed above the lower face of the foot in said sockets' and so adaptedV to engage the top walls of the sockets to limit upward movement of the frame relatively. tothe foot, said top plate having openings through whichsaid vertical members extend registering with the pas- 65 sages and larger than the ends of the passages so that the edges of theapertures4 are out of contact with the vertical members, and cooperating means on the main frame and top plate for maintaining said coil spring in an upright position over the center of the foot between said pair of ver( tical members. v

3. In a device of the class set forth, a

machine frame having a pocket opening downwardly, a coily spring having its upper part enclosed in said ocket, a foot pad consisting of va rubber b ock and a cap ate aflxed thereto and being provided wit an upstanding lug entering the lower end of said spring, said rubber block having two pockets formed in its under side, and aI air of screws extending up through the ru ber block and the ca plate and tapped into the machine frame, t e heads of said screws. be-

ing housed in said pockets formed in the rubber block.

In testimony 'whereof I hereunto aix my signature.

MANSFIELD C. CRAWLEY.

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