US2184735A

US2184735A - Typewriting machine

Info

Publication number: US2184735A
Application number: US107175A
Authority: US
Inventors: William A Dobson
Original assignee: Underwood Elliott Fisher Co
Current assignee: Underwood Elliott Fisher Co
Priority date: 1936-10-23
Filing date: 1936-10-23
Publication date: 1939-12-26
Anticipated expiration: 1956-12-26

Description

Dec. 26, 1939. w. A. DOBSON I TYPEWRITING MACHINE Filed Oct. 23, 1956 7 Sheets-Sheet l INVENTOR:

ATTORNEY 'IIIIIIIIIIIIIIIIA Dec. 26, 1939. w. A. DOBSON TYPEWRITING MACHINE Filed Oct. 23 1956 7 Sheets-Sheet 2 &1.

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' 95 INVENTOR: DY W056 fw Ar I'ORNEY.

V w. A. DOBSION TYPEWRITING MACHINE 7 Filed Oct. 25, 1956 7 Sheets-She et s W. A. DOBSON.

TYPEWRITING MACHINE Dec. 26; 1939.

Filed Oct. 23, 1936 7 Sheets-Sheet 4 mw mm a N: a

Y W B ATTORNEY.

Dec. 26,1939. I w DQBSQN 2,184,735 I I TYPEWRITING MACHINE Filed Oct. 25, 1936 '7 Sheets-Sheet 5 ATTORNEY.

Dec. 26, 1939. w DQBSON 2,184,735

TYPEWRITING MACHINE Filed 001.25, 1936 7 Sheets-Sheet s W. A. DOBSON TYPEWRITING MACHINE Dec. 26, 1939.

Filed Oct. 23, 1956 7 Sheets-Sheet 7 Patented Dec. 26, 1939 UNITED STATES PATENT, OFFICE 'rrrrwarrmc MACHINE- William A. Dobson, Wethersfield, Conn., assignor to Underwood Elliott Fisher ,-Company, New York, N. Y., a corporation of Delaware Application October 23, 1936, Serial No. 107,175'

23 Claims.

ward a common printing point upon the front of the platen. The planes in which the typebars swing converge on a line tangent with the platenand a. little in front thereof, the typeguide immediately in front of the platen serv-,

ing to finally guide and direct the bars in a central vertical plane toward the platen. The typebars are pivoted well below the platen upon a common pivot wire which is curved about a point in the line at which the type-bars converge and at right angles to such line. The type-bars are pivoted upon the pivotwire and segment slots serve to space the type-bars and to guide the bars accurately towardthe printing point. The pivot wire is curved on the smallest possible are. The type-bars have been made short to economize on space, especially important in a machine of the portable class.

In many noiseless type actions, the type swings at a decided angle downwardly toward the front face of the platen, resulting in a poor and blurry impression, and it might be said that the type is wiping upon the platen, which is especially bad when a number of carbon copies are to be made. a

Any looseness of the platen in its hearings or other looseness in the construction increases this tendency to produce poor'and blurry impressions. a

The present invention aims to improve the quality of the imprint and also aims to improve the visibility of the printing line while improving the key-touch. These improvements are 7 obtained without increasing the size of the machine. On the contrary, the height of the machine may be' reduced considerably while the ,saleability of the machine may be increased be cause of the more attractive appearance. In the present improvement, the type-face on all bars is substantially on a line passing through-the type-bar 'pivot,-and all the *types are presented, substantially straight to the printing point." The type strikeszthe platen at an inclined plane and 1 all the typeebar pivots'are located in, ornear this plane, that-is, each; bar carries,its type head-n having anupperand lower-case character, with,

the face substantially inline with the itype-bar pivot. -This insures a clear-cut impression, there 3 being-no; blurring; The types arepf such shape and design andare. carrie'd upomthe type-bar in; a way to require-the least working space andzt he least space in the type-bar nest The thrust, of the type on all type-heads is nearly in the (Cl. 197-30)- I a direction of the platen axis, and in this invention, is also in the direction of 1121c stationary nd t support usually provided behi e carriage to back up the pressure exerted against the carriage by the printing types. The carriage there fore has no chance to yield. There is no upward or downward pressure which may tend to displace or to rotate the platen,an advantage which is gained because the type is guided in the direction squarely against the axis of the platen I and the rear support. The individual type im pression is therefore perfectly in alignment with other typing. The impression is clear and nondistorted.

In the present application of this invention, the type-bars are shaped to strike the platen in a rearwardly inclined plane. This striking angle is also inclined to the plane in which the typebar pivots are located, the latter plane being inclined forwardly. The type-bars have typeheads including upper and lower case characters. Each type-bar is bent at the upper end near the type-head, the bends being varied for each type-bar so that the upper case character is exactly above the lower case character and in an inclined plane when presented to the platen. The type-action of the side type-bars tends to become somewhat less eflicient because of the greater angular bends in these type-bars so that the pivots which mount the extreme type-bars are positioned exactly in the plane tangent to the platen at the printing point and the central type-bars, having approximately no angular bend, are positioned approximately in this plane, I

or substantially in this plane from an operative viewpoint, but slightly ofiset from this plane geometrically.- Each type-head is fastened upon the type-barat the upper end.- The shank of the type-head when swinging toward the platen is behind the type-face and within the path through which the type-head travels. In the case of the extreme side actions special care must 'be taken to maintainthis condition.

Features of the invention include the provision of improvements in thefclass of typewriters disclosed in patent tov Going, 1,908,140. s

A type-action includes ,a pivotedtype-bar in 1 which the type is impressed directly on. the

platen at the printing point in a line perpen,-;

dicularto the tangent "of the platen at the printitangential plane.

'ing ;point,.and with the face of the type in the w This result is attained by, mounting the type-bars on pivots mounted below the platen, the entire array of pivots being;

approximately positioned forgoperation of the 551.

; type-bars, in the planetangent. totheplaten at p int y means of type-bar actions which may'include toggles'. The toggle may g point nda uatme t p -bars be connectedsto the I top of the type-bar at apoint sufiiciently near 0 through the axis of the platen, and the upward rotation of the printing point may be substantially 15, so that the visibility of the printing while the typewriter is operated is increased.

Another improvement is the mounting of the pivotal supports for the above-mentioned toggle action on an arcuate pivot rod that is in substantially the same horizontal. plane as the platen, and in a plane that parallels the axis of the platen whereby a substantially direct thrust towards the platen is given to the toggle.

Another improvement is the mounting of the pivot rod which fulcrums the type-bars'in a plane below the platen and below the pivot rod which pivotally mounts the toggles, said pivot rods being mounted in planes substantially parallel toeach other, whereby a compact and efli-' cient type-bar action is provided.

Another improvement is the provision of a secondary toggle pivotally connected to the firstmentioned toggle which acts to directly impress a type on the platen in a line perpendicular to the tangent of the platen cylinder at the printing point.

A further improvement is the provision of a type-bar rest for the type-bars in their forward inoperative position on a forwardly and downwardly inclined segment so that they lie nested substantially'in a plane through the printing point on the platen, and a larger horizontal arc than heretofore employed is provided for the type-bars for a. typewriter having a standard key-board, standard letter-spacing, and a full complement of type-bars, this construction providing a greater are of travel for each type-bar from the inoperative position in engagement with the segment rest to the printing point on the platen, and so permitting of a full set of 44 typebars in a typewriter of standard-size type-faces without any interference of the type-bars during operation. This forward declination of the front segment greatly improves the appearance and saleability of the typewriter by downwardly inclining the top of the front structure of the typewriter substantially. The general arrangement of declining toward the front the segments which mount the pivot rod of the type-bars and the pivot rods of the toggles also lowers the center of gravity of the typewriter and therefore increases its stability in operation.

Another advantage flowing from the improved construction is the fact that extra space may be provided'in'the portable case which encloses the typewriter. An important utility derived from the arrangement of the type-bars and the actuating toggles in a greater arc-is that all of the links which connect the type-actions and the keylevers are effective to give a substantially downward transmission of power from. the key-lever to the connected type-bar action, which substantially eliminates lateral or sidewise thrusts and consequent friction and wear of the type-bar actions, as well as eliminating friction on the sides of the slots of the comb which guides the type key-levers. These links are uniform in form and size, thereby producing economy in manu-' facture and service. 1

- Another improvement is a slot-connection between the key-lever and the actuating link whereby the slot may be readily opened or closed by bending a wall of the slot.

Another improvement is a spring anchor mounted on the segment that carries the pivot rod of the secondary toggle for mounting the recoil springs that restore the secondary toggle to inoperative position.

Another improvement is the combination of a fixed upright on the frame which operatively contacts a horizontal bar mounted in the carriage at the rear of and parallel with the platen in a plane intersecting the platen axis and the printing point, and a squeeze type-action bearing on the printing point in a line perpendicular to the tangent at the printing point.

The foregoing improvements improve the ease of action of the typewriter, improve the appearance and saleability of the typewriter, improve the visibility at the printing point, improve the sharpness and the clearness of the type impressions for a given key action, and generally enhance the operative emciency of the typewriter by reducing friction and wear.

In other words, the improvements essentially comprise a typewriter of the front-strike, noiseless class having a substantially rearward toggle action for impressing the type on the platen, in which the type-bars are all pivoted in a plane substantially tangential to the printing point, the type-face as it strikes the platen moves in a plane perpendicular to the tangential plane at the printing point, and the type-face as it engages the platen coincides with the same tangential plane. It will be understood also that this compact, low-slung organization of parts is very desirable in a typewriter of the portable type.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is an elevation, viewed from the left, partly in section along a central vertical plane, showirfg the type-action next to the right of the middle and the type-action at the extreme right.

Figure 2 is a perspective view showing the structure of the key-lever prior to connecting the lower end of the link that actuates the front end of the primary toggle.

Figure 3 is a view similar to that of Figure 2, but with the link and the'key-lever connected.

Figure 4 is a plan view showing the top segment in its relation to the vertical ribbon-shafts, with the type-bar rest and the slots in which the front elements of the primary toggles are pivoted.

Figure 5 is a left-side elevation of the improved type-action imprinting on the platen. with. the front segment and the type-bar rest in section.

Figure 6 is a plan view showing one of the side type-bars with the type near the platen for im printing.

Figure 7 is a plan view showing the type-bar shown in Figure 6 with the type-guide in horizontal section.

Figure 8 is an enlarged elevation of the typebar head and the type shown in Figure '7 and looking in a direction opposite to the arrow. Figure 9 is a plan view showing thekey-levers, their mounting, connecting links, the extreme front ends of the primary toggles, all of the keylevers at the right of a center line being shown and a few at the left, and the ribbon universal bar and the guide-comb for the key-levers at the rear.

Figure 12 is a left-side elevation showing the type-bar shown in Figure 11 about to engage the platen, the bar and the pivotally connected toggle being broken away. I

Figure 13 is a plan view showing the second type-bar from the-extreme right engaging the platen and a few others reclining on the rest at the back of the top segment.

Figure 14 is a plan view of the die designed to form type-bars for the type-actions in the second position from the extreme left and from the extreme right respectively. Figure 15 is a section on the line l-15 of Figure 14.

Figure 16 is a section on the line l6-I6 of Figure 14.

Figure 17 is a view like Figure 16 but with the parts of the die separated.

Figure 18 is a design view showing the die in outline, the fiat type-bar blank next-to the mid-, dle, and various geometrical relationships between the type-bar and the cooperating parts of a typewriter.

Figure 19 is a view at right angles to Figure 18.

Figure 20 is a side elevation of a middle type action, showing also the key-levers of the intermediate and extreme side type-actions.

Figure 21 is a design view showing the die in outline, the flat type-bar blank next to the last one on the right or the corresponding type-bar on the left, and various geometrical relationships between the type-bar and the cooperating parts.

Figure 22 is a side view of the blank type-bar shown in Figure 23 with the bent tab in dotand-dash outline.

Figure 23 is the lower part of the die for forming the type-bar next to the extreme left and the extreme right and that shown in Figure 21.

Figure 24 is the top .part of the die shown in Figure 23 inverted. J

Figure 25 shows a type bar head before trimming the edge along a line K-K.

Figure 9, the type-action immediately to the right of the center line is 23 and the type-actionat the extreme right is 44. Some of the typeactions, from 3 .to 19, inclusive, are omitted'frorn the figure.- A typewriter frame. 5| is mounted on the usual feet 52 andsupports a cylindrical platen 53 which is mounted for case-shifting assho'wn in Figure 1. The operatingkeys 54 hamm rows of different height; A, standard key-board is composedof key-levers 55, which j'rnay be de scribed as low-slung, beinggbent downwardly" under. the typewriter so as to fill. the lowest over. As will be described hereinafter, this con-5 struction-pernflits rape lowering of the ent-ire top, structure and so lessens the, height of the" machine. .Each key lever 5 5 ismo'l inted at "the; rear on the transverse pivot rod 56, a'nd recipro-Q cates ,up and down at the front in sguide slotsjil of the. transverse combfil which; caz ries'afsound deadening top stop 59, andalso a sound-deadenpaths t ing bottom stop 60. These stops 56 and 66 limit the. motion of the key-levers 55 upwards and downwards respectively. The key-levers 55 also slidably oscillate in the guide slots 62 in a transverse comb 6l, mounted in front of the transverse pivot rod 56. The comb 6| is the rear wall of a transverse bracket 63, which is formed at the front with a'dependent flange 64 which has a transverse row of anchor holes 65, one for each key-lever 55, in which upper ends of return springs 66 are secured, the lower ends of said springs 66 being adjustably fixed in one of a row of notches 61 on the lower edge of each keylever 55. If the coil spring 66 is fastened in the forward notch 61 it increases the tension of the spring and therefore makes a heavier touch on the keys 54, and vice versa, if the coil-spring is secured in a notch to the rear, it lessens the tension on the coil spring and therefore lightens the touch on the keys 54. Y

A universal bar 68 is mounted to oscillate downwardly and upwardly under the key-levers 55 immediately in front of the notches 61, on the rock-shaft 69 as shown in Figures. 1 and 9, the rock-shaft 69 being pivotallymounted in the side walls of the typewriter 5|. Return springs H fastened to the ends of the bracket 63 and to inwardly turned lugs I2 which are supported on side arms 13 of the ribbon'universal bar 68, raise theuniversal bar 68 after its depression by the key-levers 55. An escapement universal bar 14 has an upper forwardly projecting arcuate plate and is mounted for movement upwardly and downwardly on a rock-shaft l5fand actuates the esoapement mechanism. (not shown) in a manner well-known in portable typewriters of this class. I

The mechanism connecting'the ribbon universal bar 68 with ribbon spool shafts I6 is also well known in this class of portable typewriters and is not shown in the drawings. Ribbon spools 11 are mounted on the ribbon shaft 16in the usual manner. A pair of coil springs 18 lift the universal bar 14 to normal position.

A transverse cross-piece I9 is mounted in the typewriter 5| below the platen 53 and in front of it, and centrally of the cross-piece 19, a

bracket 86 is vertically supported thereon by means of screws I01, as shown in Figure 6. The

bracket 86 supports at the top a type guide 8| which is inclined rearwardly at an angle of 15 to the vertical. which there is a full complement of 44, comprises a type-bar 82 which has alower camming edge Each ofthe type actions. of'

83 which engages the arcuate flange 16 of the escapement universal bar- 14 and depresses it downwards to feed the platen a letter-space as type-bars 82 ismounted at the lowerend on an writer 5 I.

.thetype-bar engages the platen. The array of with reference to I ahorizontal. plane1 atflan angle of p 109. 1t will be 1 noted, that the arcuate. pivot I rod 84 mounts the'rarray. of type-bars 32, 150; that I when imprinting. they aresubst'antiallylina plane? space and provide room for other parts there.

that is tangential. to the platen 53 at the fprint-fl ing; point; mere'bf a d tne'pivot points also sung stantia lly liewithin this plane' The segment 85 j ..is provided with radial gu' e slots 86 "which'tend to gnaintain t e 'tybebaris ftz "i theirlnor m'al wa gmth a ents; Ea h 53 at the printing point, it is traveling in a line perpendicular to the tangent at the printing point as shown in Figure 12. The faces of type 88 at the instant of impressing the platen at the printing point lie in the plane tangential to the platen cylinder at the printing point. Each typehead 81 supports at the top and bottom lateral guides '89 which, as shown in Figure 6, engage guides 9I formed by cutting away centrally parts of the upper and lower cross-pieces 90 of the guide 8|. The cross-pieces 90 of the type-guide 8|, as shown in Figure 6, securely hold the guides 9| in the exact predetermined positions so that the letter-spacing is always precise. The guides 9| in front of the printing point have faces that lie in planes parallel with the central plane and each guide 9| is a direction-changing guide for any type-bar head 81 that strikes from the oppo site side of the central plane, and each type-bar head 81 carries on its side towards the engaging face of the guide 9| a lateral guide 89 having an outer face which, at the printing position, is parallel with the central plane and therefore parallel with the engaging face of the guide 9|.

It is apparent therefore that any type-bar head 81 during its movement towards the printing point and just prior to striking the platen is deflected by the'engagement of a lateral guide 89 and the engaging face of the guide 9|, so that it always strikes perpendicularly on the platen. Each type-bar head 81 has a different angular relationship to the corresponding type-bar 82 and this angular relationship is fixed by bending the type-bar at the top. In printing position at the platen, each type-head 81 tilts rearwardly at an angle of 15. All of the type-heads 81 converge at a point that lies within the guide 8|.

Each type-bar 82 is pivotally connected with a primary toggle 93 which has a rearwardly extending arm 94 mounted on a pivot 95 which is 'secured to the type-bar 82 near the head 81. The

' forward arm 96 of the primary toggle 93 is pivotally mounted on an arcuate rod 91 which is tilted forwardly and downwardly and lies in a plane which is inclined 10 to the horizontal and is therefore parallel with the plane formed by the pivot rod 84. A front segment 98 supports the pivot rod 91 and is also tilted forwardly and downwardly at an angle of 10. surface of the segment 98 supports an arcuate sound-deadening type-bar rest 99, on which the type-heads 81 normally rest in inoperative position. The segment 98, with the type bar rest 99 and the pivot rod 91, is disposed in a plane in close proximity to the horizontal plane of the platen axis and has itsarc formed on a greater circle than isiusual in a portable typewriter having a standard size key-board. Each arm 96 slidably oscillates in a guide-slot I formed in the segment 98, and thereby the primary toggle 93 is limited to the predetermined path of movement. Each arm 96 of the toggle has a lower forwardly projecting extension or arm IOI which, with arm 96 constitutes an operating lever at the front end of which is pivotally mounted a link I02, which, as shown in Figures 2 and 3, terminates at the lower end in a crook or bend I03, which in turn operatively engages a vertical elongated slot I04. In each key-lever 55 the rear wall I of each slot I04 may be separated from the key-lever at the upper end of the slot I04 by a horizontal cut so that the rear wall I05 of the slot I04 is easily bent sidewise, either to close the slot after inserting the crook I03 therein, or to open the slot' I04 for the removal of the The inner rear" crook I08 therefrom. All of the links I02 are of the same length, form and size, which makes them interchangeable in manufacture or service I have heretofore caused lateral thrusts in the type-actions and friction and wear in both the actions and in their mountings.

Reference to v Figure 9 indicates that downward pressure on any key 54 imparts a substantiallydo ward thrust on the forward extension IOI of each primary toggle 93. As shown in Figure 20, the slot I I04 is formed in the rear end of a horizontal extension I 06 which overlies the corresponding keylever 55 but is in the same plane. The key-levers 55 in type-action 24, next to the center line of the key-board, have the shortest extensions I 06 and the extensions increase in length so that the extension I06 in type-action 36 is greater and the extreme length occurs in type-action 44. These extensions I06 serve to eliminate substantia ily any forwardly or rearwardly inclining of the links I02, and are of such length as to give equal key dip for all the keys. A link I 08 is mounted by means of a pivot I09 substantially in the middle on the lower edge of the arm 96 and together with the vertically mounted arm On the top I of the segment II3 a flat resilient arc-shaped" piece H4 is secured over a sound-deadening layer I26 of felt or the like and forms a slightly yielding stop for a finger I I5 formed on the lower rear edge of the arm III. The link I08 has a depending extension or eccentric body 6 which forms a fly-weight or momentum accumulator for the primary toggle 93. As shown in Figure 5 the fly-weight H6 is in the operative position impressing the platen and the lower end of the connecting link I02 has traveled downwardly in the vertical slot I04 in the key-lever 55. In other words, the downward stroke on the key-lever does not carry the type 88 to the printing point on the platen 53 but it simply inaugurates and carries through the type-action a part way and toggles are all in substantially parallel forwardly inclined vertical position or in a foldedcompact position. i

The initial motion'of the type-actions'is slower than the final motion so that the touch on the "-N constituting the theoretical main portion of the type-bar for the type-bar-tab.

keys 54 remains light and easy. A recoil spring H8 is secured to the bottom of each secondary, toggle arm II I and is fastened at the front on a spring anchor II9 which is fastened on top, of the segment] I3 by screws I20 at each side.

A carriage I2I supports the platen on an antifriction roller track I22 which is mounted for case-shifting on arms I23, pivotally connected by pins I24 to lugs depending from the track support I25. Mounted transversely of the carriage at the rear of the platen and below the horizontal axis at an angle of 15 to the horizontal axis, is a bar I2'I which is of rigid construction and as the carriage I 2I moves, the bar operatively engages an upright post I28 centrally mounted on the frame of the typewriter The squeeze-action type impression requires a very precise adjustment of the relationship of the type-face and the printing point on the platen so that yielding of the platen to the rear might vary the sharpness and the clearness of the type impressions, and therefore in combination with a squeeze connection type impression directly on the platen surface, it is-of considerable importance that the platen be rigidlyheld and secured against rearward yielding.

The planes of the type-bar tabs I3! and the heads 81 converge in printing position at equal angles toward the center plane of the machine. The type system includes 44 type-bars 82, all having type-heads 81 in bent-ofi relation with the main portion of the type-bar. The extreme outer bars have'the sharpest bends, while toward themiddle of the machine these bends decrease and may be almost nothing near the center of the machine. The bending line N, and the angle of bendof the tab I 3'! on-each type-bar 82, is determinedseparately as follows: Considering, for instance, the type-action 43 shown in Figure 21, the type bar swings or converges toward a central vertical plane of the machineat an angle of 46 The plane of the type-carrying tab I31, when the typeis in printingposition, may be inclined at an equal angle of 46 15 toward the tangent plane through the printing point at the middle of the type-face ,88. The type-face 88 presses at a tangent plane against the platen, at a point in a line M passing through the platen axis, said tangent plane being inclined at to the plane in which all the type-bar pivots are arranged. The plane of the type-bearing tab I3I intersects the plane of the type-bar along a line bend line. This bend-dine N at the time of printing mustalso lie in aplane going through the. platen, axis at one-half of 25, or 12 2 inclined to the plane S (Figure 18) at which all type-bar pivots are arranged. The line N intersects the platen axis at the point 0. This same point 0 is intersected by the line M, drawn in the plane of the type-bearing tab I3I through the center ,of theglower case type-face ,when the type-bar is at the printing point. An imaginary line P is formed at the intersection of the type-bar working plane, and

.a plane above and parallel with the type-bar pivot plane, and'passing through the same point 0 in the platen axis. Figure 21 shows a diagram including the outline of a type-bar blank at the side of the system before the type-bearing tab I3! is bent. Line N represents the bending line The line Q representsfthe line at which all the type-bar planes converge. The point 0 is a point where the plane of the type-action considered intersects the platen axis.

. I 38 is bent off the vof\a twin die (I3I,

vided with holes I34- to For the outermost type-bar action considered, this point is the furthest removed from the converging line Q. The line P to O is parallel with the line S, representing the plane of the type-bar pivots, and is the same distance removed therefrom for any type-bar considered. In the present design, the angles between the lines P and N or M and N are equal in each separate action to be considered and may be calculated by the formula: 4 1 Tangent of the angle- PN or MN=cosine of the angle of convergence of the type-bar action toward the center plane times the. tangent of half the angle between the plane parallel to the type-bar pivots at plane from the platen axis to the printing point.

The type-bar tab I3I ts bent from the main portion of the bar along the line N and the bend may be calculated as follows:

The sine equal to half of the angle between the type-bar tab and the main portion of the type-bar=cosine of angle between the plane parallel to the type-bar pivots at the printing point and the plane from the platen axis to the printing point divided by cosine of the angle between the 25 lines N and P.

In Figures 14,-18, and 21, it may be seen that the main portion of thetype-bar 82 extends above the bending line N. It is a feature of the invention to connect the pressure transmitting a arm 94 as near as possible and behind the typebar head 81, as at 95, without increasing the space required for a type-bar p82 to clear the next bar. It is therefore evident that the pressure is applied in close proximity to the type-bar head 87 and there is no practical tendency for the type-bar 82 to yield due to pressure. can be seen in Figure 14 a triangular portion main portion of the type-bar. This bend is made to clear the type-bar-next to it. This triangular portion I38 may be .parallel to the type-bar tab I3! and is bent from the plane of the main portion of the type-bar 82 Just above the connecting pivot 95 of the pressure transmitting member 94 along a line X, which may be called the secondary bending line, the primary bending line being designated as N. The triangular bent-off portion I38 and the typefastening tab I3 'I may be jointedby a short bent connecting-portion I3.9 bounded by the bending lines 1! and z.

The machine includes 44 type-bars. For each type-bar 82 at the left of the machine. there is a similar bar 82 to the right of the machine with the same angular bends, but in opposite 'directions. To produce the bends on "the type-bars, there may be used a set of bending dies I29 (Figure 16) each die I29 may be in the form I33) forming one left and one right type-bar 82 at one operation. The lower half I3I of the die I29 may have pins or posts I32 and the type bar blank 82 may be proprovide type-bar and toggle-connecting pivots for proper location of the' blank upon the die. The lower half I3I of the die I29 includes a trapezoidal face I35 inclined at the proper angle to bend a pair of type-head tabs I31 and also rovides a side face I36 for "each triangular bent-off portion I38. Corresponding coacting faces I35, I36 are provided on the upper part I33 tion I40 serves as a the type-bar blank I35 is inclined and of the die. A large flat porbed for the main portion of 82, and the inclined surface demarked therefrom along the line N; each surface I35 has a trapezoid area,

the printing point and the 5 the non-parallel edges forming a bending line Y for one left and one right type-bar tab I31. These non-parallel bending edges of the die are inclined at an angle W, whose value is "determined as hereinafter set forth, and may be disposed right alongside the faces on the die that pins form the triangular bent portions I38 of the type-bars 82.

Two type-bar blanks 82 to form one left and one right type-bar may be positioned over the pins I32 of the lower die I3I. The upper die portion I33 may then descend to form the bends. There are required22 twin dies I29 to form the bends for all the type-bars, each twin die having faces of proper size and location and being inclined at the proper angle to the main flat portion I48 of the die. Each die I28 includes gaging I32 individually located in each die so that the type-bar blank 82 may receive the bends in proper relation to the main body of the bar.

The type-bar blank 82 may be of slight oversize at the type-bar carrying tab I31, and one blank may be used for all the type-bars. The type-bars 82 may be trimmed along a line K after being bent, to form an accurate edge against which athe type-bar head 81 may be gaged for fastening purposes. The blanks may be formed in several different shapes, the different shapes being used for forming type-bars to be used in different positions, perhaps four or five different shapes being used, the exact shape for each pair of type-bars being finally determined by the bending and trimming operations. The typeheads 81 may be riveted by rivets I42 upon the type-bars and the rivet holes I may also be punched out after the type-bars 82 are shaped. It is preferred that the trimming and'the punching of the rivet holes be done after the bar is bent to shape to insure accuracy of location.

Special trimming tools may be used to trim typeheads 81 along a line KK as shown in Figure Each bending die I29 has the pins I32 located differently and in exact relation to the main bending line N and the theoretical point 0 from which the main bending line N radiates. In the embodimentof the invention shown in the drawings each type-bar 82 at the time of printing, has

its head'81 and corresponding flat fastening tab I31 inclinedltoward the platen at an angle which is equal to the incline of the type-bar action toward the printing point. For this reason no change is required in the type-head 81 as used in the marketed Underwood machine. However, the angle of inclination of the bar and the type-bar tab portion need not agree; it is only necessary that each type-bar tab' I131 and each type-head 81 stand inclined toward the platen in printing position to an extent to permit a minimum clear ance of the type-bars while swinging.

The following formulas enable the angles of bend for each pair of type-bars to becalculated. Tangent of angle between 'lines PN or =cosine of angle of convergence of a typebar tangent.

'The derivation of'the above formula is from the following:

permitting cancellation of the common factor, distance 0 to Q.

Sine or half of angle Example for No. 22 or No. 23 type-action typebars having an angle of convergence with central plane of 1 15': tangent of angle between lines PN or MN=.99976 .22169=.22164, and the angle corresponding to tangent .22164: 29' 50".

Example for No.2 and No. 43 ty -action typebars, having an angle of convergence of 46 15': tangent of angle between PN or MN'==.69151 .22169=.153301, and the angle corresponding to tangent Sine of half of angle between main portion of type-bar and bent-ofi tab= from which common factor 0 to Qxcosine of angle between type-bar plane and center plane is cancelled.

The rule is: Sine=cosine tangent. Substituting according to above rule in the preceding formula, the sine of half the angle between the main portion of a type-bar and the bent tab= cosine 1 2 X tangent 1 2? tangent 12=}Xcosine of angle between PN- or MN Example for No. 22 and 23 type-action typebars: Cosine 12%;=.97630 Cosine of 12 29' 50"=.9'7631 Sine of half the angle of bend:

.9763 9 -38768 The'angle corresponding to the sine .98'168 is 81 and the full bend is 2 8l=162. Distance 0 to Q, that is, from line of convergence to point of intersection O is found by the following formula: Distance 0 to Q=distance from line of convergence squarely on to axis of platen divided by cosine' of angle between the type-bar plane and the center plane of the typewriter. I

For type-bars No. 2 and43, distance 0 to-Q= v -1.1388 I Distance 0 to Q is calculated for ,each individual pair of bars formed by the twin die.

Angle W=- -ang1e between lines PN or MN (see Figure 24).

From a consideration of Figurejl it is clear that these improvements in a noiseless typewriter are also of considerable advantage in a portable typewriter because a very compact construction is produced by getting all of the operative parts into a minimum space and utilizing the lowermost space underlying the typewriter between its feet'and the supporting table, increasing thestability of a portable typewriter by lowering the center of gravity and having all of the segmentsin a position that may be termed flow-slung, inclined forwardly and downwardly to the maximum degree permitted by the space afforded.

This forward inclination of "the segments also enhances the appearance and saleability of a portable typewriter and gives extra space within the portable case over the machine in front of the platen, As shown, each arm I H is formed of two interengaging parts which serve to balance the swing of the fiy-weight H6 supported between the upper ends thereof. It is also to be understood that increase of the arc of the typebar segment rest 99 and its downward inclination increases the arc of travel of type-bar-head 81 to and from the printing point on the platen 53, thereby assuring non-interference of the typebars in action.

Variations may be resorted to within the scope of the invention and portions of the improvements may be used without others.

Having thus described my invention, I claim: 1. In a front-strike, noiseless typewriter, in

; combination, a platen, a set of type intercepting the front of the platen above the horizontal plane through the axis thereof, a set of type-bars carrying said type and operating in planes substantially radiating from the printing point, a set of type-key levers, each lying'in substantially a direct front to rear position, and disposed below the corresponding type-bars, a system of actuating connections between said type-bars and typekey levers, said system of actuating connections including levers disposed above the key-levers and operating in planes substantially radiating forwardly and rearwardly from a given point, and links, one for each type-action connecting said radiating operating levers to corresponding type key levers, said radiating operatinglevers presenting an array of operating arms diverging "toward the planes of the corresponding type-key levers, and a front segment providing a type-bar rest and a pivot rod for said operating arms, both ance and saleability of the typewriter is in '2. In a front-strike, noiseless typewriter, in combination, a platen, a set of type-bars operating in planes substantially radiating from a given point, a set of type-key levera each lying in sub-- stantially a direct front-to-rear position and disposed below the corresponding type-bars, a system of actuating connections between said type-bars and type-key levers, said system of actuating connections including levers disposed above the key-levers and operatingin planes ra.

diating forwardly and laterally from a given point, and links, one for each type-action, con- .and a front segment inclined tow nectingsaid radiating operating levers to corresponding type-key levers, said radiating operating levers presenting an array of operating arms diverging toward the planes of the corresponding type-key levers, a comb for said typ e-key levers, a ds the front and defining an arc in close proximity to the hdrizontal plane of the platen axis, the rear of said segment forming a type-bar rest and said segment carrying an arcuate pivot rod for said operating arms, each key-lever operating in a vertical plane with an operatively effective downward pull on the connecting link, and each typebar moving through a substantial front-to-rear arc between the inoperative position and the printing point. I

3. In a front-strike, noiseless typewriter, in combination, a platen, a set of type-bars operating in planes radiating from a given point, a set of type-key levers each lying in substantially a direct front-to-rear position and disposed below the corresponding type-bars, a system of actuating connections between said type-bars and typekey levers, said system of actuating connections including levers disposed above the key-levers and operating in planes radiating forwardly/and laterally from a'given point, and links, one for each type-action, connecting said-radiating op erating levers to' corresponding type-key levers, said radiating operating levers presenting an array of operating arms diverging toward the planes of the corresponding type-key levers, a comb for spacing said type-key levers, and a front segment carrying an arcuate pivot rod for said operating arms, inclined towards the front and defining an arc in close proximity to the horizontal plane of the platen axis, each keylever operating in a vertical-plane with an operatively eiTective downward pull. on the connecting link, whereby easy and uniform typeaction is procured, and whereby a full set of type-bars may be placed in a machine without operative interference thereof, and with conse quent elimination of side strain on the comb or on the type-action or its mounting.

4. A front-strike typewriter of the noiseless class having a platen, an array of type-bars piv otally mounted to swing rearwardly from below the printing line through arcs to the line of printing on the platen, each type-bar carrying a type whichimpresses the platen in a line per pendicular to the tangent, of the platen at the printing point, a toggle having a pivotal connection with and sufiiciently. near the top of said type-bar toeliminat completely any'fiexing of the type-bar when the toggle is actuated, a front segment, said tog l being pivotally mounted on said segment in substantially thev same plane as the platen axis, a secondary toggle having a link and being pivotally, mounted below the type-bar pivot,v and a key-lever connected with said first t le. Y

5. A front-striketypewriter of the. noiseless class having a platen,'an array of type-bars pivotally mounted to swing rearwardly from below the printing line through arcs above the line of printing on the platen, each type-bar carrying a type which impresses the platen in a line perpenelicular to the tangent of the platen atth printing point, a toggle having a pivotal connection with and sufiicientlynear the top of said type-bar to eliminate completelyany'fie'xing of the type-bar when the toggle is actuated, a front segment, said toggle being pivotally mounted on said segment in substantially the same plane as the platen axis but inclined forwardly, and a secondary toggle having a link and being pivot? ally mounted below the type-bar pivot, and a key-lever connected with said first toggle.

6. A front-strike typewriter of the noiseless class having a platen, an array of type-bars pivotally mounted to swing rearwardly from below the printing line through arcs above the line of printing on the platen, each type-bar carrying a type which impresses the platen in a line perpendicular to the tangent of the platen at the printing point, a toggle having a pivotal connection with and sufficiently near the top of said type-bar to eliminate completely any flexing of the type-bar when the toggle is actuated, a front segment, said toggle being pivotally mounted on said segment in substantially the same plane as the platen axis, said tangent at the printingpoint on the platen being inclined upwardly and rearwardly, and a secondary toggle having a link and being pivotally mounted below the type-bar pivot, and a key-lever connected with said first toggle.

7. A front-strike typewriter of the noiseless class, having a platen, an arraybf type-bars pivotally mounted to swing rearwardly from below the printing line through arcs above the line of printing on the platen, each type-bar carrying a type which impresses the platen in a line perpendicular to the tangent of the platen at the printing point, a toggle having a pivotal connection with and sufliciently near the top of said type-bar to eliminate completely any flexing of the type-bar when the toggle is actuated, a front segment, said toggle being pivotally mounted on said segment in substantially the same plane asthe platen axis but inclined forwardly, said tangent at the printing point on the platen being inclined upwardly and rearwardly at an angle of substantially 15, and a secondary toggle having a link and being pivotally mounted below the type-bar pivot, and a key-lever connected with said first toggle.

8. A front-strike typewriter of the noiseless class, having a platen, a row of type-bars mounted to swing rearwardly from below the line of printing through arcs above the line of printing, each type-bar being pivotally mounted on a substantially horizontal arcuate rod tilted forwardly and downwardly and carrying a type positioned thereon to approach the platen in a line perpendicular to the tangent of the platen at the printing point, and a toggle having a pivotal connection with and sufiiciently near the top of said type-bar to eliminate completely any \flexing of the type-bar when the toggle is actuated, a front segment, said toggle being pivotally mounted in said segment in substantially the same plane as the platen axis, said toggle pivotal mounting including an arcuate rod tilted forwardly and downwardly and lying in a plane parallel with said type-bar pivot rod.

9. A front-strike typewriter of the noiseless class, having a platen, a row of type-bars mounted to swing rearwardly from below the line of printing through an arc above the line of printing, each type-bar being pivotally mounted on an'arcuate rod tilted forwardl'y'and downwardly from the horizontal at an angle of substantially 10, and carrying a type positioned thereon to approach the platen in a line perpendicular to the tangent of the platenat the printing point, and a toggle having a pivotal connection with and sufliciently near the top of said type-bar ing, each type-bar being pivotally mounted on an arcuate rod tilted forwardly and downwardly,

and carrying a type which impresses the platen.

in :a line perpendicular to the tangent of the platen at the printing point, a toggle having a pivotal connection with and sufiiciently near the top of said type-bar to eliminate completely any flexing of the type-bar when the toggle is actuated, a front segment, said toggle being pivotally mounted on said segment in substantially the same plane as the platen axis, said pivotal mounting including an arcuate rod tilted forwardly and downwardly in a plane parallel with said first-mentioned arcuate rod, said segment being also tilted forwardly and downwardly in a plane parallel with said second arcuate rod, a secondary toggle having a pivotal, connection with said first toggle, a link connected with said first toggle, a key-leverconnected with said link, a downwardly and forwardly inclined arcuate rod on which said secondary toggle is pivotally mounted, an arcuate rest for said type-bars mounted on said front segment and inclined forwardly and downwardly, whereby the appearance and saleability of the typewriter is enhanced, and whereby, among other results, the center of gravity of the typewriter is lowered.

11. In a front-strike-type action system cooperative with a platen, a set of type-carriers working in planes substantially radiating from a given point, a set of type-key-levers individually ranging substantially fore and aft of the machine and disposed below the type-carriers, said type-carriers being pivotally mounted in an arcuate segment overlying the key-levers and being tilted downwardlyat the front adjacent to but just clearing the tops of the key-levers, and a system of operating connections between said type-carriers and key-levers, said system of connections including operating levers disposed above the key-levers and working in planes radiating forwardly and laterally from a given point, an arcuate array of pivots for said operating levers in close proximity to the horizontal plane of the platen axis, and links, one for each type-action, connecting said radial operating le ers; to corresponding type-key levers, said radial operating levers presenting an array of operating arms diverging toward the planes of the corresponding type-key levers, whereby, among other results, friction and wear of the type-action and its mounting are decreased and the touch of the typewriter lightened and made uniform.

\ 12. In a front-strike type-action system 00-. operativewith a platen, a set of type-carriers a system of operating connections between said type-carriers and key-levers, said system of connections including operating levers disposed above the key-levers and working in planes substantially radiating forwardly and laterally from a given point, and links, one for each type-action, connecting said radial operating levers to corresponding type-key levers, said radial operating levers presenting an array of operating arms diverging toward the planes of the corresponding type-key levers, and a segment mounted forwardly of the platen and over and to the rear of the keyboard having a forwardly inclined type-carrier rest at the rear, said segment being inclined forwardly and downwardly, whereby the appearance and saleability of the typewriter are enhanced, and whereby, among other results, the center of gravity of the machine is lowered with a resultant increase in the stability of the typewriter.

'13. In a front-strike type-action system co-' operative with a platen, a set of type-carriers working in planes substantially radiating from a given point, a set of type-key-levers individually ranging substantially fore and aft of the machine and disposed below the type-carriers, said type-carriers being pivotally mounted in an arcuate segment overlying the key-levers and being tilted downwardly at the front adjacent to but clearing the tops of the key-levers, a system of operating connections between said type-can riers and type-key levers, said system of connections including operating levers disposed above the key-levers and working in planes radiating forwardly and laterally from a given point, and

presenting an array of operating arms diverging toward the planes of the corresponding ty'pekey levers, links, one for each type action, connecting saidradial operating levers to corresponding type-key levers, and a segment mounted forwardly of the platen and over and to the rear of the keyboard and having a forwardly inclined type-carrier rest at the rear, said segment being inclined forwardly and downwardly, whereby the appearance and saleability of the typewriter are enhanced and whereby the center of gravity of the machine is lowered with a resultant increase in stability of the typewriter, said segment providing an arc of sufiicient size for a full normal set of type-key-levers so that straight key-levers without lateral extensions may be used and so that the links may operate substantially directly downwardly through direct fastenings on the key-levers, thereby eliminating lateral thrusts, wear, and friction on g the parts and mounting of the type-action.

14. In a noiseless typewriter, in combination, a platen, a type-action having a type-bar pivoted below the platen,a primary toggle pivoted in front of the platen and comprising twoarms, a secondary toggle pivotally connected with the forward arm of said primary toggle, the upper link of said secondary toggle comprising a flyweight, a segment in front of the type-bar pivot mounting, the lower arm of said secondary tog-a gle being pivoted for forward and rearward swinging on said segment, a stop limiting the rearward swinging of said lower arm, a recoil spring mounted on said arm and tending to draw said arm forward, and an anchor mounted on said segment and extending in front of said lower arm, fastened to said segment at either side and on which said recoil spring is mounted.

15. In a noiseless typewriter, in combination, a platen, a type-actionfhaving a type-bar pivoted below the platen, a primary toggle pivoted in front of the platen and comprising two arms,"

a secondary toggle pivotally connected with the forward arm of said primary toggle, the upper link of said secondary toggle comprising a flyweight, a segment in front of the type-bar pivot mounting, the lower arm of said secondary toggle being pivoted for forward and rearward swinging on said segment, a. soun -deadening stop comprising an under layer of felt or the like and an over layer of thin resilient metal and limiting the rearward swinging 'of said lower arm, a recoil springmounted on said arm and tending to draw said arm forward, and an anchor mounted on said segmentand extending in front of said lower arm, fastened to said segment at either side and on which said recoil spring is mounted.

16. In a typewriter, in combination, a platen, a type-action system comprising an array of a full complement of type-bars having their operating planes converging at a common point in front of the printing point, each type-action including an actuating toggle operative in the same radial plane as the connected type-bar, a plurality of key-levers pivotally mounted to move in vertical planes parallel with one another, each type-action diverging towards a separate keylever, and links of the same form and size connecting each toggle with a separate key-lever,

the' type-bars and the toggles being-pivotally mounted on concentric arcs of such radii that the pull of each link is substantially downward whereby all lateral projections from the keylevers are eliminated.

'17. In a typewriter, in combination, a platen, a type-action system comprising an array of a full complement of 44 type-bars, a pivot rod mounting said type-bars and in close proximity to a plane tangent to the platen atthe printing ,point, converging at a common point in front of type bars each type-action including an actuating toggle operative in the same radial plane as the connected type-bar, said toggle being operative to effect a substantially direct thrust towards the platen and having a forwardly proje'cting arm, a plurality of key-levers pivotally I tering in a line in which the planes of operation of the type-bars converge, and lying in close proximity to a..plane tangential to the platen at the printingpoint, type mountecLon the typebars, said type-:When engaging the. platen traveling in a line; perpendicular to the tangential plane, the face of said type lying in said tangential plane, and type-heads having shanks supporting the type on the type-bars, the angle between a vertical plane perpendicular to the face of the type and the shank being in identity withthe angle of convergence of thecorresponding type-bar, and the tangent of half the'angle formed by the line of intersection of the plane I of any-type-bar action and the plane through the platen axis at the printing point and'the line of intersection of the plane of said typelthe printing point, the operating planesof said bar action and the plane through the platen axis parallel to the plane through the type-bar pivtering in a line in which the planes of operation of the type-bars converge and lying in close proximity to a plane tangential to the platen at the printing point, type mounted on the tabs of the type-bars, said type when engaging the platen traveling in a line perpendicular to the tangential plane, the face of said type lying in said tangential plane, and type-heads having shanks supporting the type on the type-bars, the

angle between a vertical plane perpendicular to the face of the type and the shank being in identity with the angle of convergence of the corresponding type-bar, and the sine equal to half of the angle between any type-bar tab and the main portion of the corresponding type-bar being equal to the cosine of the angle between the plane parallel to the type-bar pivots at the printing point and the plane from the platen axis to the printing point, divided by the cosine of half the angle formed by the line of intersection of the plane of any type-bar action and the plane through the platen axis at the printing point and the line of intersection of the plane of said type-bar action and the plane through the platen axis parallel to the plane through the type-bar pivots.

20. A type-action system for typewriters having pivoted type-bars and a cylindrical platen, an arcuate array of pivots for the type-bars centering in a line in which the planes of operation of the type-bars converge, and lying in close proximity to a plane tangential to the platen at the printing point, type mounted on the typebars, said type when engaging the platen traveling in a line perpendicular to the tangential plane, the face of said type lying in said tangential plane, and type-heads having shanks supporting the type on the type-bars, the angle between a vertical plane perpendicular to-the face of the type and the shank being in identity with the angle of convergence of the corresponding type-bar, the tangent of half the angle formed by the line of intersection of the plane of any type-bar action and the plane through the platen axis at the printing point and the line of intersection of the plane of said type-bar action and the plane through the platen axis parallel to the plane through the type-bar pivots being equal to the cosine of the angle of convergence of the type-bar action toward the center plane multiplied by the tangent of half the angle between the plane parallel to the type-bar pivots at the printing point and the plane from the platen axis to the printing point, and the sine equal to half of the angle between the type-bar tab and the main portion of the type-bar being equal tothe cosine of the angle between the plane parallel to the type-bar pivots at the printing point and the plane from the platen axis to the printing point divided by the cosine of half the angle formed by the line of intersection of the plane of any type-bar action and the plane through the platen axis at the printing point and the line of intersection of the plane of said type-bar action and the plane through the platen axis parallel to the plane through the type-bar pivots.

21. In a front-strike, noiseless typewriter having a cylindrical platen, an array of type-bars having their operating planes converging on a line tangential to the platen, an arcuate array of pivots for said type-bars, arranged in a substantially horizontal plane, the plane of said type bar pivots being tilted forwardly and downwardly from the horizontal, each type bar carry ing a type positioned thereon to approach the platen in a direction substantially perpendicular to the tangent of the platen cylinder at the printing point, said tangent, in a fore-and-aft vertical plane of the typewriter, being at a substantial angle from the line of convergence of the typebar planes, a toggle engaging each type-bar adjacent the type carrying portion and having a forward arm pivotally mounted in front of the platen, a series of key levers, and links between said key levers and said toggle arms.

22. In a front-strike, noiseless typewriter having a cylindrical platen, an array of type-bars having their operating planes converging on a line tangential to the platen, an arcuate array r of pivots for said type-bars, arranged in a substantially horizontal plane, the plane of said type-bar pivots being tilted forwardly and downwardly from the horizontal, each type-bar carrying a type positioned thereon to approach the platen in a line perpendicular to the tangent of the platen cylinder at the printing point, said tangent being at a substantial angle from the line of convergence .of said type-bar operating planes, a toggle engaging each type-bar adjacent the type, said toggle having a forward arm pivotally mounted in front of the platen, the pivots of said toggle arms presenting a substantially horizontal arcuate array in parallelism with the plane of said type-bar pivots, a series of keylevers, and links between said key-levers and said toggle arms.

23. In a front strike, noiseless typewriter having a cylindrical platen, an array of pivoted typebars 'having their operating planes radiating from a common line, an arcuate array of type-bar pivots disposed in a substantially horizontal plane inclined forwardly and downwardly from the horizontal, a series of key levers ranging in a fore-and-aft direction of the typewriter beneath said type-bar pivots, type-bar actuating devices in the radiating operating planes of said type-bars, including a system of primary toggles having links pivoted to said type bars, and operating arms, an arcuate pivot rod for said operating arms, disposed in a substantially horizontal plane approximately at a level with the platen axis and inclined forwardly and downwardly, parallel with said type-bar pivot array, said actuating devices also including a series of secondary toggles articulated to said primary toggles, and an arcuate pivot rod for said secondary toggles, co-planar with said type-bar pivot array; and links connecting said primary toggle operating arms to corresponding key levers, each of said type-bars having a type positioned thereon to strike the platen at a printing point substantially above the horizontal plane of the platen axis.

WILLIAM A. DOBSON.

Patent No. 2,18b,,75 5.

CERTIFICATE OF CORRECTION. v

Deceniber 26', 1959..- f WILLIAM A. DOBSON. i

It is hereby certified that. error appears in-the printec} specification of the above numbered patent requiring correction as follows: Page 9, sec- 0nd column, lines 58 to inclusive, claim 1'], strike out thehv vords "point, converging at a common point in front of the printing point, the operating planes of said type bars" and insert instead point, the operating planes of said type-bars converging at a common point in front of the printing point,

- and that the-said Letters-Patent shoul d be readwith this cbrrectiontherein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 6th day of February, A. vD. 191w.

Henry Van A-rsdale,

(Seal) Acting Commissioner of Patents.