US2496357A - Typing and printing mechanism for accounting machines and the like - Google Patents

Description

Feb. 7, 1950 3. K. RAINEY 2,496,357

TYPING AND PRINTING MECHANISM FOR ACCOUNTING MACHINES AND THE LIKE 4 Sheets-Sheet 1 Filed NOV. 16, 1945 INVENTOR.

CLIFTON KING AINEY. BY 624 o ATTORNEY.

Feb. 7, 1950 c. K. RAINEY 2,496,357

TYPING' AND PRINTING MECHANISM FOR ACCOUNTING MAQHINES AND THE LIKE Filed Nov. 16, 1945 4 Sheets-Sheet 2 FEB.

CL F'TON KINGINEY.

ATTORNEY.

Feb. 7, 1950 c. K. RAINEY TYPING AND PRINTING MECHANISM FOR ACCOUNTING MACHINES AND THE LIKE 4 Sheets- Sheet 5 Filed Nov. 16, 1945 CL FTON KING RAINEY.

Feb. 7, 1950 c. K. RAINEY TYPING AND PRINTING MECHANISM FOR ACCOUNTING MACHINES AND THE LIKE 4 Sheets-Sheet 4 Filed Nov. 16, 1945 INVENTOR.

IFTON KING Alrftx Patented Feb. 7, 1950 TYPING AND PRINTING MECHANISM FOR ACCOUNTING MACHINES AND THE LIKE Clifton King Rainey, Knoxville, Tenn., assignor, by mesne assignments, to Rainey Accounting Machine Company, Inc., Knoxville, Tenn., a

corporation of Tennessee Application November 16, 1945, Serial No. 629,185

4 Claims. 1

This invention relates to typing, printing and computing machines and more particularly to an improved imprinting action means therefor, although the teachings and concepts thereof may be employed with equal advantage for other purposes.

It contemplates more especially the provision of a simplified, improved, compact and more durable key structures and action devices for combined typewriting and accounting machines, such as illustrated in my United States Letters Patent No. 2,183,920, issued December 19, 1939.

Instrumentalities for typing, computing and accounting machines are common, but these are intricate, involve many parts, and for practical and commercial reasons are applicable for the most part to elaborate accounting and similar devices wherein compactness, simplicity of parts, effective imprinting and dependable operation over extended periods have not been collectively accomplished. In machines involving plural sheets for recording impressions and computations of mechanical devices, the front and back feed visible carriage are respectively very suitable and usually deemed best from a time and labor saving standpoint, intricacy and maintenance and expense being secondary to the results sought. With the teachings of the present invention improved typing and printing instrumentalities are provided for action on plural independent sheets that are capable of either front or back visible feed response. Computing machines embodying the teachings of the present invention are comparatively inexpensive from a structural and production cost standpoint, since very compact, simple, and dependable actions have been incorporated to make possible the use of minimum and small sturdy parts conducive to producing a comparatively low cost machine.

One object of the present invention is to improve the construction and operation of devices of the character mentioned.

Another object is to provide an improved and simplified imprinting action for typing, printing, and computing instrumentalities and the like.

Still another object is to provide an improved computing section for accounting machines which is more compact, dependable and effective.

A further object is to provide an improved computing machine printing action which in- 2 volves few parts, is highly durable, more compact, and less expensive in construction.

Still a further object is to provide improved key actions in conjunction with a simple hammer action for multiple keys for more compactness, dependability and effectiveness.

A still further object is to provide an improved printing hammer and type guide for combined typing and accounting machines.

Other objects and advantages will appear from the. following description of an illustrated embodiment of the present invention.

In the drawings:

Figure l is a fragmentary top plan view of a combined typing and accounting machine embodying featuers of the present invention.

Figure 2 is a fragmentary sectional view in elevation taken substantially along broken line 11-11 of Figure 1 with parts broken away to clarify the showing.

Figure 3 is an enlarged fragmentary front detail View of the cam actuator shaft for operating the hammer and other instrumentalities viewed from line III-III of Figure 2. I

Figure 4.- is a fragmentary enlarged sectional view in elevation taken substantially along line IV-IV of Figure 1.

Figure 5 is a fragmentary top plan sectional view taken substantially along line V-V of Figure 2.

Figure 6 is a fragmentary top plan sectional view taken substantially along line VI-VI of Figure 2.

Figure 7 is a fragmentary detail sectional view in elevation of the type bar guide and hammer portion.

Figure 8 is a detail plan view of the combined type bar guide and hammer, parts thereof being shown in sections to clarify the showing.

Figure 9 is a fragmentary sectional View of the computing type bar actuators taken substantially along line IX-IX of Figure 1.

Figure 10 is a fragmentary sectional view in elevation taken substantially along line X-X of Figure 9.

Figure 11 is an enlarged detail side view inelevation of the computing bar follower guide.

Figure 12 is an end View in elevation of the computing bar follower guide shown in Figure 11.

Figure 13 is a sectional view taken substantially along line XIIIXIII of Figure 11.

Figure 14 is a bottom plan view of the computing type bar follower guide shown in Figure 11.

Figure 15 is a fragmentary sectional view taken substantially along lin XVXV of Figure 9.

Figure 16 is an enlarged side'fragmentary detail view of the computing bar, guide follower, and actuator assembly shown in Figures 9 and 15.

Figure 17 is a fragmentary front view in elevation of the lower end portion of a computing type bar.

Figure 18 is a side view in elevation of a complete computing type bar.

Figure 19 is a sectional view in elevation taken substantially along line XIXQX of Figure 18.

The structure selected for illustration is not intended to serve as a limitation upon the scope or teachings of the invention, but'is merely illustrative thereof. There may be considerable variations and adaptations of all or part of the teachings depending upon the dictates of commercial practice. The present embodiment comprises instrumentalities mounted on a carriage frame supported by suitabl feet I ll2 to rest on a fiat surface such as a table'or desk. The carriage paper accordingto'the purpose or purposes for which the mechanismand instrumentalities have been designed, assembled and integrated irrespective'of theparticular term or terms that may be utilized to identify the machine or mechanism for illustrative purposes.

A platen roller [5, having a rubber or other suitable tubularcover l6 disposed thereover, is fixed to a shaft I! which is .journalled in bearings fixed to 'thesideplates i-3-i4. One or more sheets of paper may be disposed between the feeding rollers (not shown) and the platen 45-46 in a manner specifically illustrated in my co-pending application Serial No. 580,117, filed February 28, 1945.

The sheets are fed by the platen il6 within the-path of type bar and computing bar actuators for the desiredprinting and posting thereon as is customary in known accounting machines.

The entries are usually identified with descriptive indicia along with the date for each entry effectedwith the usual type printing bars or keys simulating a standard typewriter mechanism. The posting operation is effected through numeral bars confined in an improved section for operation by adding and subtracting racks, the latter not being any part of the present invention. The present invention concerns itself with the combined arrangement'and improved actuation of the type bar and computing bar and their operating instrumentalities.

The descriptive type bars are collectively construed as a typewriter type bar segment to comprise the usual'number and arrangement of type bars '8 simulating the make-up of the usual and customary standard typewriter, and are pivoted as at l9 within the radially slotted arcuate mount 20 supported by the frame I 0 in the customary manner. The type bars l8 are impressed in re lief with the usual upper and lower case indicia 2 l-22 formed on substantially rectangular plates 23. The indicia plates 23 are suitably attached to correspondingly sized and shaped projections 24 that are laterally offset from and attached to the free extremities 25 of the type bars !8. The

usual felt supports 26 serve as a rest for the type relation.

bar projections 24, these being sustained by a substantially L-shaped arcuate bar 21 fixed to the frame It) adjacent the forward wall 28 thereof.

The type bars 18 have a downwardly oifset ear 28 at their pivoted extremity for attachment of a rod link 30 thereto. The rod link 30 extends to and pivotally connects with the free extremity 3| of the link plate 32 pivoted as at 33 within slots 34 depending from the arcuate bracket 21. The link plate 32 is actuated by a vertical rod link 35 and is pivotally connected therewith as at 35 to the central region thereof for operative connection as at 38 to an actuator key arm 37 by reason of the laterally pivotal connection with the lower extremity of the vertical rod link 35. The key arm 3! corresponds in number with the type bars 38, and the former are pivotally connected at their-inward horizontal extremity 39 to a transverse bracket 40 fixed to the frame Ill.

The springs 4| are anchored at one extremity 42 to the key arms 3?, to extend upwardly for anchored connection to the frame It as at 43 in order to normally impart an upward urge to the key arms 37 to maintain them in their extreme clock-wise position (viewed from Figure 2) and thereby sustain the key arms 31 in their normally horizontal initial position. The key arms 31 terminate forwardly in an upwardly offset shank 44 which have circular letter and number indicating indicia confining circular key frames 45 attached thereto to correspond with the indicia 2|--22 formed in relief on the supporting plate 23. The type bars i 8 are displaceable in a clockwise direction responsive to the downward finger tip displacement of the key indicia frames 45 that transmits the displacement to the key arm 31 which, in turn, actuates the key bar It in a clock-wise direction for striking with impact at a common ribbon frame and site to imprint paper disposed between the feed rollers (not shown) and the platen i5-l6 in a manner similar to the operation of a standard typewriter.

The key bars l8 operating responsive to the depression of the key arms 3'! coordinate their imprinting with an adding and substracting bar segment 45 (Figure 5) consisting, in this instance, of side plate members 41-48 having top and bottom cross members 4B5il, respectively, disposed therebetween to maintain the side plates 41-48 in fixed space parallel relation. The adding and subtracting bar segment 46 is generically referred'to herein as a computing segment. The top cross member 49 is of substantially U-shaped configuration (Figure 5) and is secured in position by means of suitable fasteners such as machine screwsiil', in this instance two, which maintain a plurality of vertically disposed slide guide plates 5! in horizontal parallel spaced The'verti'cal plates 5| correspond in number to the adding'bars which, in this instance, are ten in number to present a corresponding number of numeral digits as will appear more fully hereinafter. It should be'observed that the upper'and-lower extremities of'the slide guide plates'5l are provided With substantially rectangular notches to receive the upper and lower cross members-49-50 which are press fitted therein.

Each vertical slide guide plate '5! is provided with a bar follower guide'52 (Figures 2 and 11) comprising, in this instance, a substantially rectangular frame having inwardly extending vertical side members'53-54 disposed between laterally projecting end members555$ to present a vertical slide groove?! (Figure 14) complemental to each vertical plate 5|. This arrangement also provides a horizontal cam follower guide groove 58 (Figure 12) to receive the cam end of an actuator lever of the computing type bar segment 46 to be hereinafter described. One of the side members 53 of each bar follower guide 52 is provided with an ear 59 having an aperture 60 provided transversely therethrough for pivotal connection of the lower extremity 6| of an elongated adding bar shank 62. The pivotal connec tion is effected through a pin 63 that extends through the lower apertured end 6| of the bar adding shank 62 for establishing pivotal connection with the ear 59.

The adding bar shank 62 comprises, in this instance, part of the ten digit computing type bar segment 46. Each adding bar shank 62 extends upwardly to provide a laterally extending imprinting face 64 whereon numeral indicia 65 from zero to nine to 9) reading downward are cast, engraved, or otherwise formed thereon in relief from the top to the bottom in sequence. The laterally extending face plate 64 presents a substantially T-shaped adding type bar 62 (Figure 19) each of which is pivotally connected to the follower guides 52 (Figure 16) for vertical displacement along the plates serving as a slid guide for the follower guides 52. The adding machine bar shanks 62 are each provided with an angularly offset fiat spring 66 anchored as at 61 to the rearward edge of the bar shank 62 for downward projection between the lower bar shank extremity 6| and the adjacent edge 68 of the upper cross member 55 provided on each of the bar follower guide frames 52 (Figure 16). The flat springs 66 normally urge the adding bars 62 in a counter-clockwise direction (viewed from Figure 9) against the forward plate 69 (Figures 2 and 4) to maintain them in true vertical alignment in their initial inoperative position. The forward plate 69 is attached between the side plate 41-48 of the adding type bar segment 46 to vertically align with the upper wall 18 of the arcuat mount of the pivoted type bars l8.

It should be noted that the adding bars 62 are of substantially T-shaped cross-section and contact each other along the adjacent edges of their laterally offset face plates 64. The shanks 62 thereof slide through correspondingly shaped and sized slots H provided in a horizontal bar 12 (Figure 5) provided between the side plates 41-48 of the adding key segment 46. The bar follower guides 52 also contact each other along their adjacent edges presented by the opposing surfaces of the laterally projecting end frame members 55-56 thereof to afford a compact segment of free sliding elements that are displaced by improved cam type lever actuators 73 (Figures 2 and 9) which serve to reciprocate the bar follower guides 52 vertically along the guide plates 5|. In order to accomplish this without pins or pintles such as is customary for computing key segments, the lever actuators 13 each comprise an arm 14 having an integral circular boss conforming to and complemental of a circular bearing and spacer 15 disposed adjacent thereto to serve as a pivotal mounting and contacting bearing therefor.

To this end, the circular bearing and spacer plate 15 is in registry with the enlarged boss end of the lever arm 14 which is part of a normally offset shorter arm '16 formed integral therewith. The relation of the actuator lever arms 14-16 present a substantially increased oscillatory displacement of the operating end of the actuator lever arm 14 proportional to the increased length thereof over the shorter arm 16. The circular bearing 15 is axially apertured therethrough as at H for journaled support on a shaft 18 (Figures 1 and 2) which is mounted in the frame I0 between the side plates 41-48 of the segment 46. Collars 19-88 (Figure 1) are fixed to the.

shaft 18 to retain the circular bearing and con tacting plate 15 of the actuators 13 in assembled contacting relation, there being an actuator 13 for each of the follower guides 52.

The longer lever arm I4 of the actuator 13 converges to merge in a substantially circular cam 8| having rounded sides 82-83 and a flat end 84. The rounded ends 82-83 of the cam 8| are diametrically opposite each other and possess a diameter slightly smaller than the cam follower guide groove 58 and precision fit therein to enable the relative sliding and rotary movement therewith responsive to the oscillatory displacement of the actuator 13 as will be apparent from the full anad dotted outlines of the actuator 13 (Figure 9).

It should b observed that the actuator lever cams 81 are of no greater thickness than the follower guide 58 so that the adjacent corresponding element confine each other against lateral displacement to provide a compact and durable operating connection between the relatively moving parts and improved operating characteristics. Thus, the usual mounting pins which require space and present, at best, intricate assembly and maintenance problems are totally eliminated. The function of the actuator 13 is to index the position of the adding keys or bars 62 responsive to adding and subtracting racks (not shown) that do not constitute a part of this disclosure.

It should be noted that the free extremity of the shorter actuator arm 16 also converges to terminate in a circular cam 85 which has diametrically opposite circular portions 86-81 and a substantially flat end 88. The fiat end 88 is, in this instance, notched as at 89 for operative connection with the calculating mechanism (not shown) to present the operating characteristic of precluding the zeros of the indicia to appear in front of the extreme left digit and thus avoid the printing thereof as a prefix digit. The shorter actuator arm 16 of each actuator 13 provides its cam in the path of a rack bar 90 (Figure 2) that serves to return the actuator 13 and its operatively connected bars 62 to their initial position. Coil springs 9| are anchored as at 92 to each of the actuator arms 16, with their other extremity anchored at 93 to the side plate 48 of the adding key segment 46 to normally urge the actuator 16 in a clock-wise direction (viewed from Figure 2).

After the calculating mechanism has pre-determined the position of the adding bars 62 of computing segment 46, it becomes necessary to effectuate the printing of the numerals in line with the printing sight through a ribbon that is common to the type bars l6 and the adding bars 62. To this end, a hammer mechanism 94 is provided for all of the adding bars 62. The hammer mechanism 94 consists, in this instance, of a rod 95 that is disposed between the extremities 96 of mounting arms 91-98 (Figures 4 and 8). The extremities 96 which carry the hammer rod 95, are offset from their supporting arms 91-98 that extend downwardly for pivotal mounting as at 99-!!! to the side plates 41-48 7 of the adding segment 46 (Figure 6). Suitable fasteners such as machine screws IOI extend through the hammer arm extremities 96 for axial engagement of the hammer rod 95 to rigidly support the latter forwardly of the adding bars 62 in impacting relation therewith when the adding keys or bars 62 are elevated in the path thereof from their initial lowered position, for displacing the keys 62 against the platen I--I 6 with an impacting force responsive to instrumentalities to be hereafter described.

The hammer supporting arms 9'l-98 extend downwardly beyond the pivot mount 99-400 to present reduced extensions I02 that carry a rod I03 therebetween for attachment by axially engaging machine screws I04. An annular groove I05 in the rod I633, receives the looped extremity I08 of a coil spring Iiil which is anchored at its other extremity to an eyelet iii-8 (Figure 2) provided with a threaded shank 509 which extends through the type key mount 40 for engagement by a threaded nut H0. With this arrangement, the tension in the coil spring IUI may be adjusted to normally urge the hammer rod 35 in the clockwise direction (viewed from Figure 4) with the lower edges III (Figure 4) of the hammer arms 97 normally in contact with actuating cams [I2 (Figures 3 and 4) in edge alignment with the hammer arm edges I I I.

The cams i I2, in this instance two, are mounted on a cam shaft H3 (Figures 3 and 4) which, in turn, are journaled for rotary support in the frame it for operation responsive to an electric motor (not shown). The cams H2 have a low portion H4 and a high point H4 which effectuates the extreme impacting displacements of the hammer rod 95 against any of the adding bars 62 which are set upwardly in the path thereof by the calculating mechanism (not shown). Normally, the adding bars 62 are disposed below the path of the hammer rod 95 which are rockably mounted through its arms 97 on the pintles SSS-I88. Another set of cams IE5 (Figure 3). in this instance two, are mounted on the cam shaft I I3 to operate the restoring bars I I5 in timed re-- lation with the cams l I2.

In order for the hammer rod 95 to serve the dual function as a guide for the type bars 18, the hammer rod 95 is slotted as at H5 in alignment with the printing frame to present upstanding, confronting and forwardly extending flanges II'I which are spaced to provide rearwardly converging surfaces I I8 that merge with the slot I I6 for the reception of the rearwardly offset type bar extremity 25 serving to cooperate with the guide groove IE6 and confronting flanges II! to insure a proper striking position for the type bars or keys I8. Thus, a single hammer rod 95 serves to impart impact to all of the adding bars 62 and also serves as a guide for all of the type bars I8 to insure the proper indexing of the imprinting operation for both the type bars I8 and the adding bars 82. It will be observed, therefore. that the number of parts has been minimized with the result in saving and space, production expense, and improved facility of operation with greater dependability.

The carriage within which the platen I5-IG is rotatively mounted, is horizontally spaced by means of the usual typewriter carriage spacing mechanism. The carriage is confined for guidance in confronting V-shaped guide blocks II9I20 which have the usual confronting racks I2I-I22 (Figures 1 and 2) provided thereon to properly space the carriage responsive to the operation of the typing and computing instrumentalities. While the calculating mechanism has not been shown, a brief description of the functional elements of the illustrated structure makes reference to certain associated standard calculating elements with which those skilled in the art are familiar. This reference renders the instant disclosure understandable to those skilled in the art, and will enable a greater appreciation for the improvements constituting the subject matter of the present invention.

It should be noted that for indexing purposes, the numeral keys comprising part of the standard set of type bars I8 make one-half of their normal downward motion and hit a bar for indexing purposes without imprinting. This effects the punching of the indexing pins to space the stop box one position to operate a full set of pins for any one number of a group. To imprint the numbers without adding or subtracting, it should be observed that the stop box is ordinarily one space laterally of the rack bar. The motor for operating restoring levers will then operate the stop box to set at one column to the right of the indexing finger. With the instrumentalities in their initial position, the hammer operating cams II2 have their low point contacting the hammer operating arms 91. The larger cams II5 which control the restoring bars effect the camming edge extending rearwardly with the restoring bars back as far as they can be displaced. Then the motor bar that is readily accessible from the type keyboard, is manually tripped and lifts the built-in motor clutch release to make electrical contact to initiate a full revolution of the motor clutch shaft. In the first part of this action, the hammer rod is moved forward from the platen I5-I6 to allow enough space for the adding type bars 62 to rise. The position of the bars 62 are pre-set by the calculating mechanism to enable the elevation thereof through the influence of the actuator springs 9| to serve as the lifting influence thereon within the limits set by a stop box of standard or any suitable construction.

When the motor has turned the cam shaft H3 one-half revolution, the adding type bars 62 have arrived at their upper limit of movement according to the indexing pins set in the stop box, the latter comprising a part of the calculating mechanism (not shown), the cams II2 operate the hammer to cause the type bars 62 to be impacted against the ribbon at the printin frame sight to effect the printing on the sheet that is disposed against the platen I5I6. Now, then, with the start of the second half of the revolution of the cam shaft I I3, the hammer 95 is moved forward, the restoring bars are then in a position to shift the adding wheels in mesh with the racks which are limited to corresponding positions of the type bars. As the cams II5 revolve further, the restoring bars II5 are pushed rearwardly, pulling the rack mechanism to the rear and the type bars are synchronously pulled down to their initial position. After the type bars are restored to their initial low position, the cam II2 permit the hammer to move rearwardly under the influence of the spring II" to the initial position as a type bar guide. This briefly traces a cycle of operation commensurate with a full revolution of the motor which is automatically rendered inactive at the end of each revolution by its own built-in throw-out clutch.

While I have illustrated and described a preferred embodiment of this invention, it must be understood that the invention is capable of considerable variation and modification without departing from the spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction set forth, but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

I claim:

1. In a device of the character described, the combination with a frame, of a carriage movaloly mounted on said frame, a platen on said carriage, a computing type loar segment on said frame, a typewriter type bar segment on said frame, a plurality of computing type lbars included in said first named segment, a plunality of typewriter type pars included in said second named segment, means for independently positioning each of said computing and typewriter pars relative to said platen, and a combined hammer and par guide coextensive with all or said computing and typewriter type bars to respectively effect the printing of computing time bars and the guidance of typewriter type ibars toward said platen.

2. In a device of the character described, the combination with a frame, of a carriage movably mounted on said frame, a platen on said carriage, a computing type par segment on said frame, a typewriter type lcar segment on said frame, a plurality of computing type lbars included in said first named segment, a plurality of typewriter type lbars included in said second named segment, means for independently positioning each of said computing and typewriter pars relative to said platen, a combined hammer and typewriter type ibar guide common to all of said computing and typewriter type bars, and means adapted to operate said hammer relative to said computing type par segment and terminate the operation thereof independent of any translation to said carriage to effect the printing of the positioned computing type bars against said platen,

said hammer having means thereon for the guidance of typewriter type bars toward said platen when said hammer is inactive with respect to said computing type per segment.

3. In a device of the character described, the combination with a frame, of a carriage movaloly mounted on said frame, aplaten on said carriage, a computing type lbar segment on said frame, a typewriter type bar segment on said frame, a plurality of typewriter loars pivotally connected to said last named segment for displacement to a common printing point, a plurality of computing type bars, slidaple fol-lower guide pivotally associated with said computing type lbars, parallel guide plates in said computing type loar segment iflOI' slidalbly receiving computing type :bar follower guides, actuating lever cams operatively connected to each of said computing type par follower guides to linearly displace said computing type pars, said slidalble follower guides comprising a frame having oppositely open and normally disposed grooves, one of. said grooves serving to slidaloly mount said parallel guide plates,

the other of said grooves serving to linearly and rotatively receive the lever cams therein to linearly displace said cam follower guide along said parallel guide plates responsive to the oscillation oi said lever cams, and a hammer coextensive with all of said computing type bars o impact the latter against said platen, there being a transversely flanged cut-out in said hammer to guide the typewriter type bars to the typing point above said typewriter type Hoar segment.

4. In a device of the character mentioned, the combination with a frame, of a carriage on said frame, a computing type bar segment, a plurality of differentially positionable computing type bars in said segment, means for verticall positioning said computing type bars in said segment, a printing hammer coextensive with said computing type ibar segment to confront all of said computing type bars positioned therein for imprinting movement toward said platen, spring means for normally urging said printing hammer against said platen, a typewriting key par se ment, a plurality of typewriting key bars in said last named segment, means for selectively displacing said typewriting key lbals toward said platen to imprint against said platen albove said printing hammer, a typewriter key bar guide on said hammer to define the printing position of said typewriter key pars therewith when said printing hammer is in its normally inoperative position, and cam means for retracting said printing means against the urge of said spring means, said cam means having an abrupt tripping portion thereon to impact said printing hammer under the urge of said spring means against the positioned computing key bars in the direction of said platen to effect the printing operation, whereby said hammer serves as a guide for said typewriter key bars and as a hammer for said computing type tears in a selected sequence of operationsrelative to said platen.

CLIFTON KING RAINEY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Re. 15,985 Schafier Jan. 20, 1925 780,271 Felt Jan, 17,.1905 1,033,932 Raloer July 30, 1912 1,053,943 Dorman Feb. 18, 1913 1,340,864 Waldheim May 18, 1920 1,471,654 Graf Oct. 23, 1923 1,975,808 .Sundstrand Oct. 9, 1934 2,131,918 Mills Oct. 4, 1938 2,183,920 Rainey Dec. 19, 1939 2,264,855 Pasinski Dec. 2, 1941 2,399,724 Dil-ling May 7, 1946 FOREIGN PATENTS Number Country Date 423 569 Great Britain Feb. 4, 1935

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