US1741689A - Typewriting machine - Google Patents

Description

Dec. 31, 1929. A. B. ELY

TYPEWRITING MACHINE 2 Sheets-Sheet 'Filed June 11. 1927 Alonzo B. 5/ BY J lVENTOR ATTORNEY5 Dec. 31, 1929. B, ELY 1,741,689

TYPEWRITING MACHINE Filed June 11, 1927 2 Sheets-Sheet, 2

INVENTOR ATTORNEYS Patented Dec. 31, 1929 UNITED STATES,

PATENT OFFICE ALONZO IB. ELY, or eno'ron, NEW YORK, ASSIGNOR To L c'smrrn & conoiu mm wm'mns me, or smcnsn, NEW YORK, a conrona'rron or NEW YORK TYPEWRITING MACHINE Application filed June 11,

integral platen-supportin end plates and an integral carriage feed rac ;'the provision of improved antifriction supporting means for a platen carriage; the provision of improved means ,for effecting adjustments between opposed raceways of a platen carriage; the

provision of means whereby correct adjustment between the feed rack and feed pinion for the platen carriage is facilitated; the provision of means for taking end thrust resulting from line spacing and carriage returning operations of a line space device mounted on the carriage; the provision of an improved construction and arrangementof the carriage advancing means; and the provision of an improved means for limiting the maximum travel of the carriage.

Other features and objects of the invention will appear from the following description in detail of the preferred embodiment of the invention illustrated in the accompanying drawings wherein is illustrated a platen carriage and bed and associated parts especially adapted for use in the Corona F our'typewriting machine.

In the drawings: Figure-1 is a plan view of the carriage and bed, the carriage adjusting implement being shown in position for use at one of the adjusting points;

Fig. 2 a sectional view on the line 22 of Fig. 3;

Fig. 3 an end View of the carriage and bed, these parts being shown in the rearwardly and downwardly tilted position in which they 1927; Serial 1163198365.

' tilted as in Fig. 3;

Fig. 6 a perspective view looking from the I rear and showing the two sections of the carriage detached;

Fig. 7 a perspective view of the carriage adjusting implement;

Fig. 8 a fragmentary sectional view of the carriage taken on the line 88 of Fig. 5;

Fig. 9 an enlarged sectional view on the line 9-9 of Fig. 2, the'carriage and bed being tilted as in Figs. 3 and 5;

Fig. 10 a fragmentary sectional view taken through the centers of the rack-forming holes drilled in the raceway flange forming portions of the two carriage blanks and the carriage bed blank prior to bending of the raceway flange forming portions into V-form;

Fig. 11 a section on the line 1111 of Fig.13;

Fig. 12 a fragmentary View showing the roller-engaging or inner side of one of the carriage racewa flanges;

Fig. 13 a sectlon on the 12; and

Fig. 14 a perspective viewof the carrier for the antifriction bearing rollers.

The traveling platen carriage consists in its entiretyof a front section formed of a single piece of sheet steel, 9. rear section formed of a single piece of sheet steel, six screws for holding the two sections together in adjusted relation, and a seventh screw for tying together two bracing lugs formed respectively on the main body of the front section and on one of the end plate portions of said section, as hereinafter described. The carriage bed is formed of a single piece of sheet steel.

Y The main front section of the carriage has. a flat rectangular bottom plate 1, a pair of up standing platen supporting end plates 2 bent up. from the ends of the bottom plate, a raceway flange 3 bent down from the front edge line'13-13 of Fig.

of the bottomulplate and extending substantially the f length of the carriage, and a flange 4 bent down from the rear edge of the bottom plate, said flange 4 extending substantially the length of the carriage in a plane perpendicular to the bottom plate and carrymg along its lower edge a forwardly extending portion lying in a plane arallel with the base plate and provided wit teeth along its forward edge to form an integral-carriage feed rack 5 which extends from end to end of flange 4.

The rear section of the carriage comprises a flat plate 6 overlapping for the reater part of its width from front to rear t e bot" tom plate 1 of the front section. The plate 6 extends substantially the full length of plate 1 and overlaps plate 1 a substantial distance from front to rear, preferably about half the distance between the front and rear edges of plate 1, and is formed at its rear edge intermediate its ends with a downwardly bent raceway flange 7 opposite the raceway flange 3 on the plate 1. Flange 7 extends substantially the full length of the carriage a short distance behind flange 4 a on plate 1 and the plate .6 is formed at its rear edge adjacent opposite ends of said flange 7 with two rearward extending lu s 8 and 9 lying in the plane of the plate, t e lug 9 having an upstanding rear portion 9, and said lugs serving as carriage traveling limiting stops, as more fully hereinafter described.

The oyerlappingplatesl and6 are-clamped tightly together in adjusted relation by means of six screws '10 the shanks of which ass downward through fore and aft exten ing slots 11 in plate 6 and are threaded into screw holes 12 in plate 1. The screw holes and slots are arranged so that the six fastening screws are staggered with relation to a line extending longitudinally of the carriage, one row of screws 10 clamping the plate 6 to plate 1 near the rear edge of plate 1. and the other row of screws 10 clamping the plates together near the forward edge of plate 6. It will be obvious that plate 1 is greatly stiffened by raceway flange 3 and by flange 4 and integral rack 5, that plate 6 is stiffened by raceway flange 7, and that the broad overlap and staggered fastening arrangement for the two plates afl'ords a firm non-tilting connection between the two carriage sections and greatly strengthens the main body of the two-part carriage.

The platen 13 is mounted on the platen shaft 14 which is journaled adjacent its ends in the cylindrical inner end portions 15 of two cupped bearing bosses formed at the inner faces of the carriage end plates 2 by a metal-drawing operation. A somewhat broader and smoother bearing for the platen shaft is thus afforded on each of the carriage end plates than would be the. case if the" shaft were journaled in holes punched through the plates. These drawn bosses 15 also serve to somewhat stiffen the carriage boss 15 is of somewhat larger diameter thanthe right-hand bearing boss, since the lefthand finger wheel sleeve 16 in the construction shown passes through the boss and into the platen to control a suitable fractional line-spacing device.

A suitable line spacing mechanism (includmg a line spacing and carriage returning lever 17 which is provided with a pawl, not shown, for rotatin the ratchet wheel 19 connected with the pfaten 13)- is mounted on a bearing post 20 carried by a sheetv metal bracket 18. Bracket -18 is attached b three screws 21 to the outer face of the le -hand end plate 2 of the carriage, the screws 21 being threaded into screw holes 22 in the end plate. The line spacing mechanism shown is the line-space mechanism employed in the Corona Four machine and is of a well-known construction. The left-hand carriage end plate which supports the line spacing device is braced against strains incident to carriage returning and line s acing operations of the line spacing lever 17 by means of apair of bracmg lugs 23 and 24. The lug 23 is bent upwardly rom the forward edge of the carriage plate 1 between the left-hand end plate 2 and the left-hand end of the raceway 3, and lies fiatwise in a plane erpendicular to the plane of said plate 1. T e lug 24 is bent mwardly from the front edge of the lefthand end plate 2 and lies fiatwise against the front face of the. In 23. The overlapping lugs are rigidly Tocked together by means of a fastening screw 25' the shank of which passes through registering holes in the overlapped lugs. Preferably the hole in the lug 24 is not threaded and that portion of the screw shank which passes through said lug 24 is not threaded, the hole in lug 23 being threaded and the screw shank beng threaded only through the threaded hole 1n the lug 23, as indicated in Fig. 9.

Theend plates of the carriage are provided at their rear ends with, hearing apertures 26 for the margin stop bar of the Corona'Four machme. The right-hand end plate is prov1 ded with an aperture 27 and the base plate 1 is provided with screw holes 28, all for connection of the several parts of the paper feed mechanism of the Corona Four machine with the front section of the carriage, while the left-hand end plate has an integral lug 29 punched inward therefrom and forming an anchor for the return spring of the margin stop bar of said machine. The upstanding portion 9 of the lug 9 on the carriage section 6 forms an anchor for the'return spring of the cast-off means of the paper feed mechanism of the Corona Four machine. The paper feed mechanism and the margin stop bar of the Corona Four machine are constructed substantially as shown in the patent to Armstrong, No. 1,619,013, dated March 1, 1927.

' release baih carriage is formed with an integral lug 33 for supporting the guide screw of the carriage-centering stop of the Corona Four machine, and'is also formed with an integral lug 34 forming an anchor for the return spring of the carriage-centering stop which is pivoted on the same screw in hole 30 as the right-hand side arm of the escapement release bail.

The carriage bed is stamped up from a single piece of sheet metal and comprises a flat rectangular base plate35 having a front raceway flange 36 bent upward from the forward edge ofsaid plate and a rear raceway flange 37 bent upward from the rear edge of said plate. The plate 35 and the flanges 36 and 37 are approximately the same length as the raceway flanges of the carriage and extend upward between the carriage raceway flanges, the raceway flange 37 on the carriage bed extending upward between the feed rack supporting flange 4 and the raceway flange 7 on the carriage;

The portions of the raceway flanges 36 and 37 which extend between the raceway flanges 3 and 7 are pressed inwardly toward'each other to form a V-shaped outwardly facing channel in each of the carriage bed flanges. The portions of the carriage flanges 3 and 7 which overlap the carriage bed flanges are pressed outwardly to form an inwardly facing V-shaped channel in each flange. sheet metal, anti-friction roller. carrier 38, of well known construction, is housed in the front raceway formed by the flanges 3 and 36, and a similar anti-friction roller carrier ,38 is housed in the rear raceway formed by 1 the flanges 7 and 37. A pairof antifriction rollers 39 are rotatably mounted at each end of each carrier 38 with the axes of the two rollers forming each pair disposed at right angles to each other, so that the two rollers of each pair travel on difierent sets of opposed parallel faces of the complementary raceway flanges between which the carrier 38 travels, in the well known manner.

In order that the antifritcion roller s may always travel one-half the distance traversed by the carriage, a geared driving connection is provided between each carrier and the carriage and bed. This geared connection comprises a sheet metal inion 40 j ournaled on a pivot pin 41 secured to the carrier 38, the teeth of said pinion entering holes H extending through the raceway flanges at the apex of the V-shaped roller-receiving channel in each flange, the webs of metal T between the holes in each flange forming rack teeth with which the pinion teeth mesh.

The rack tooth portions T of the racewa flanges are formed in a special manner whic will be now described, attention being called to Figs. 10 to 13 of the drawings. The raceway-forming portions R of the blanks from which the carriage sections and the carriage bed are formed each have drilled therein, before the several blanks are bent up into shape, a row of holes which are cylindrical, as shown at H in Fig. 10, for approximately one-half the thickness of the blank, and are frusto- K conical, as shown at "H in-Fig. 10, for the remaining portion of the thickness of the blank, the ends of the holes of greatest diameter being located at that face of the portion R of the blank which is to form the tracks H are pressed more nearly into parallelism,

due to compression of the webs of metal between the holes along the concave face of the folded raceway portion of the blank, all as shown in Figs. 11, 12 and 13. In other words, during the folding operation the metal of the wider portions of the webs between the holes adjacent the convex face of the bent or folded blank is stretched while the metal of the remaining portion of the thickness of the webs is compressed and expandedlaterally at the concave face of the bent or folded blank where the webs are narrowest, and the onehalf of each web above the line of fold will It will be observed that by this arrangement teeth T are formed which are slightly beveled at each side where they are engaged by the edges of the teeth of the roller carrier driving pinion 40 in such manner as to facilitate the meshing with the pinion and rack teeth, and also that the holes H may be drilled while the blank is in its original fiat form. The formation of the teeth after the raceways were bent into form would be a relatively difiicult andexpensive operation. If holes cylindrical throughout were drilled While the blanks were in their flat state, the inner ends of theholes would be contracted and the tooth-forming webs would be of undesirable formv for meshing of the pinion teeth therewith. Moreover, if previously drilled cylindrical holes were employed it would be necessary to drill the holes of greater diameter than is the case with flaring holes of the kind illustrated, in order that the inner ends of the holes in the blank after the bending of the blank into final form may be large enough to accommodate the pinion teeth. This would result in weakening the raceway flange and also result in the formation of teeth T which would be narrower than in the case shown and correspondingly weaker. This is undesirable since the carriage and bed blanks are formed of thin sheet steel and the holes H and teeth T and the pinion teeth are necessarily small, the parts being illustrated in full size in Figs. 1 and 2.

The rack teeth T extend approximately one-quarter the length of the raceway flanges at both sides of mid-length of the carriage bed, and .the carriage stop lugs 8 and 9, heretofore described, are adapted to cooperate with companion stops on the carriage bed to limit the maximum travel of the carriage and prevent jamming of the pinion 40 in the raceway beyond the ends of the rack teeth T. The stop means on the carriage bed comprises a bracket 42 held at its lower end to the bottom face of the carriage bed 35 by a pair of fastening screws 43 and extending upwardly behind the rear raceway flange 7 of the "car- -riage. The screws 43 extend through slots 44 in the bracket and are threaded into the bottom plate 35 of the carriage bed, the slots extending longitudinally of the carriage bed to afford adjustment of the bracket 42 transversely of the machine. At one side thereof the bracket 42 is formed with a stop lug 45 extending upwardly and forwardly over the carriage raceway flange 7 into the path of travel of the carriage stop lu 8, and at its opposite side said bracket is ormed with a tions of the carriage may be adjusted rela- 1 .tively to each other in fore-and-aft direction with ease and great precision so that the antifriction rollers will travel easily but without provided with a series of rectangular holes 48 spaced apart longitudinally of the carriage and registering with the holes 47 in the front section. The holes 48 are larger than the holes 47, the latter holes being disposed approximately centrally of the holes 48.

The length of the adjusting slots 11 is such that the two sections of the carriage, while loosely connected by the clamping screws 10,

may be first lowered over the carriage bed about the anti friction bearing devices and the carriage then contracted to confine the antifriction devices in the raceways and efi'ect meshing of the driving pinions 40 of the roller carriers 38 with the teeth T of the associated racks formed .in the raceway flanges. The clamping screws 10 are then partly tightened sufliciently to prevent accidental expansion of the carriage, but not sufiiciently to prevent forcing the two carriage sections apart or toward each other by means of the adjusting implement shown in Figs. 1 and 7.

The final accurate adjustment of the carriage is then made by means of this adjusting implement. This implement comprises a shank portion 49, carrying a handle cross-bar 50 at one end, and having a reduced cylindrical portion 51 atits opposite end forming a sub axle adapted to rotatably fit in either of the holes 47 in the front section of the carriage. A cam plate 52 is tightly swaged on the reduced shank portion 51 at the upper i end of the reduced shank portion so as to turn with the shank. It will be obvious that with the clamping screws 10 partly tightened up, as above described, the carriage sections may be forced apart or toward each other at various points along the length of the carriage, as may be required in making the final adjustment, by inserting the pivot portion 51 of the adjusting implement shank into the proper pivot hole 47 in plate 1 of the carriage.

and then rotating the implement by handle 50 to cause the toe of the cam 52 to exert pressure against either the forward edge or the rear edge of the registering hole 48 in the carriage plate 6, as may be required to make the desired adjustment. The two sections of the carriage may be locked securely against relative movement after the final adjustment is made by tightly screwing up the clamping screws 10.

It is desirable that the teeth'of the carriage feed rack 5 shall mesh with the teeth of the carriage feed pinion 53 to the proper depth. In the drawings a part of the rotary escapement mechanism similar to that embodied in the Corona Four machine is shown, only so much (3 the esca ment being shown as is necessary. for a. all understanding of the present improvement.

1 journaled in a bushin 55, this bnshin being swaged in a hole 56 ormed in-a braaxet 57. In the present construction the flat body portion of bracket 57 is detachably and adjustably held to the bottom late 35 of the carriage bed by a pair of astening screws '58,

a'ssed u wardly through slots 59 in the racket p ate and threaded into screw holes in the base plate'of the carriage bed, as shown in Figs. 2, 4 and 9. In order that the depth of mesh between the feed pinion teeth and the feed rack teeth, may be adjusted, the flat body portionof the bracket is formed with the slots 59through which the shanks of the screws extend, such slots extending transversely of the carriage bed or fore-and-aft of the machine as shown in Fig. 4. The base plate 35015 t ,e carriage bed is formed with a hole 60 registerin with the hole 56in the bracket 57 and a ording clearance for the bushing 55.

InJorder that the extent of relative adjustment between the feed inion 53 and the feed rack 5 may be readily 0 served, and the depth of mesh effected by adjustment of bracket 57 may be observed while the arts are assembled, the registering holes 4 and 48 of the two sections of the carriage are disposed over the feed. rack 5, as clearly shown in Fig. 1 so that the intermeshing teeth of the fee pinion and rack may be observed through each set of registering holes 47 and 48 at different points in the travel of the carriage.

' The spring i driven carriage advancing drum 61 is rotatably held to the bottom of the carriage bed 35, adjacent one end of the bed,

by supporting means 62, said supporting means being similar to that embodied in the Corona Four machine. In the present construction the usual carriage pull cord 63, attached to the drum 61 at one end, passes up through a slot 64 in the base plate 35 of the carriage bed and is attached to an anchor screw 65 (Figs. 1 and 5) threaded upwardly through the base plate 1 of the front section of the carriage adjacent the right-hand end of the carriage, said slot 64 and screw 65 be-' ing arranged on a line between the flange 4 on the front section. of the carriage and the raceway flange 36 on the carriage bed. The cord 63 passes over a pulley 66 ro ating in the slot 64. Pulley 66 is journaled an an axle formed of a short length of steel wire 68 forced through two sheet metal eyes 67 punched up from the base plate 35 of the carriage bed. Said eyes tightly embrace the wire pul1ey axle which is driven therethrough and rests on the top face of the plate '35, and one end of the wire at the outer side ofone of of screw holes 69 for attachment of the bed to the-upper endsof the obliuely shiftable' pair of racewa carrying brac frame of the orona Four machine.

What I claim is 1. A platen carriage for typewriting chines comprising two sections each formed of a single piece of sheet metal, one of said sections forming the front portion of the carriage and comprising a fiat plate-like bod portion having an integral carriagefeed rac pendent from its rear edge and an integral raceway flange pendent from its -forward' edge and also having a pair ofintegral up-'.

standing plate-like end portions at opposite ends thereofeach formed with aplaten shaft bearing, the other section forming the, rear ets of the shift portion of the carriage and comprisinga flat plate-like body portion overlapping the body portion of the first section and having an 1n-v tegral raceway flange pendent from its rear edge to the rear of the carriage feed rack, and

means ,for'securing said flat bod' portions of the carriage sections to each 0t er in different relatively adjusted positions fore-andaft of the carriage.

'2. A platen carriage for typewriting machines comprising two sections each formed of a single piece of sheet metal, one of said sections forming the front portion of the carriage and comprising a flat plate-like body portionhaving an integral carriage feed rack pendent from its rear edge and an integral raceway flange pendent from its forward edge and also. having a pair of integral upstanding plate-like end portions at opposite ends thereof each formed with a platen shaft bearing, the other section forming the rear portion of the carriage and comprising a flat plate-like body portion overlappmg-the body portion of the first section and haying an integral raceway flangevpendent trom its rear edge to the rear of the carriage feed rack, the body portion of the front section having screw holes therein and the body portion of the rear section having slots therein extending fore-and-aft of the carriage and registering with the screw. holes in the front section, and clamping screws having shanks passing of the carriage, there being a plurality of said registering holes and slots in each row. i 4. In a typewriting machine, a platen carriage having a base and platen-supporting end members, a support'on which the carriage.

is mounted for traveling movement, a feed rack held to the carriage under the carriage base and ma plane substantially parallel with the base, a feed pinion meshing with said rack and disposed in a lane substantially parallel with the carriage ase, and neans supporting the feed pinion under the'carriage base for adjustment to vary the depth of mesh of the pinion and rack teeth, said carriage base having a series of apertures therein spaced apart longitudinally of the feed rack and dis osed to ermit observation of the relatively a justab e meshed rack and pinion at diiferent points in the travel of the carriage from a two carriage parts rigidly together in different fore-and-aft adjusted relationship.

6. In a typewritingmachine, a sheet metal carriage bed comprising a base plate having integral upstanding raceway flanges formed with outwardly facing channels, a sheet metal carriage traveling over said bed and having a two-part base plate, one part of sald base plate having a raceway fiange pendent from its front edge in front of the forward raceway flange of the bed and formed with an inwardly facing channel, the other part of said base plate having a raceway flange pendent from its rear edge behind the rear raceway flangeon the bed and formed with an inwardly facing channel, said first-mentioned part of the base plate being provided with an integral carriage feed rack located between the raceway flanges of the bed, means for locking the two parts of the base plate together in different fore-and-aft adjusted relation, and antifriction roller elements confined in the racewaysformed by the oppositely facing channels in each pair of juxtaposed raceway flanges.

7. A typewriting inachine as claimed in claim 6, wherein one of the base parts of the carriage is formed, with a pair of integral upstanding end plates for supporting a platen.

8. A typewriting machine as clalmed in claim 6, in which one of said carriage base parts is formed with integral stop lugs adjacent opposite ends thereof and a bracket is attached to the carriage bed substantially mid-length of the bed and is formed with a pair of abutments each disposed in the path of movement of a different one of saidstop lugs for determining the maximum limits of travel of the carriage over the bed.

9. In a typewriting machine, a traveling platen carriage having a sheet metal raceway element bent into concavo-convex form in bent webs of metal extending across 'the line' of bend of the raceway element separating the holes of a row of holes formed in each race way element prior to the bending of the element into concavo-convex form and of greater area at that face of the element which is to have the concave surface, a gear element having peripheral teeth meshing with the rack teeth of both raceway elements, an antifriction rolling element in the raceway formed by said companionraceway elements, and a connection between said gear element and rolling element whereby said rolling element is constrained to travel the same distance as the gear element when the carriage is reciprocated.

10. In a typewriting machine, a platen carriage, a carriage bed, said carriage and bed having cooperating pairs of sheet metal raceway elements each bent into approximately V-shape in cross section and arranged with the concave faces of the bed raceway elements facing the concave faces of the adjacent carriage raceway elements, each raceway element having a longitudinal row of rack-teethforming webs therein, each web extending across the line of bend of the raceway element of which it forms a part and having side edges fiaring'inward toward each other toward the concave face of the raceway element, said webs of each row constituting the portions of the body of the raceway element intermediate the holes of a row of counter-sunk holes formed in the element prior to bending thereof along the line of bend and with the outwardly flaring end portions of said preformed countersunk holes adjacent that face of theelement designed to form the concave 'face of the finished raceway element, a plurality of antifriction rolling elements between each pair of cooperating raceway elements, a carrier in each raceway for said rolling elementsmaintainingthe rolling elements in predetermined spaced relation longitudinally of the path of travel of the carriage, and a pinion journaled on each carrier and meshing with the rack-teeth-forming webs of the two adjacent companion raceway elements.

11. In a typewriting machine, a carriage support, a carriage on the support having a base, a feed rack held to the carriage under the base. a feed pinion under the carriage base meshing with the rack, and means supporting the pinion for adjustment toward and from the rack, said carriage base having apertures therein afiordin'g aview of the inter:

meshed rackand pinion riage. I 12. In a typewriting machine, a pair *of stationary raceway members, a platen carfrom above the cars riage having a base comprising two overlapping plates each carrying-a raceway member at its outer edge cooperating with one of the stationary raceway members, one of said one plate being circular to afford a pivot bearing for the stub'axle of a hand-operated rotary adjusting cam and the apertures in the other plate being larger than said circular apertures for engagement of said adjusting cam with walls thereof in expanding and contracting'the carriage, and rolling elements interposed between the stationary raceway members and the raceway members carried by the carriage base.

13. In a typewriting machine, a sheet metal carriage bed having a base plate, a platen carriage mounted on the bed to travel thereover, a spring-driven carriage advancing drum having a draw cord attached thereto and to thecarriage, said bed having a slot therein, means supporting the drum from the bed below the bed. a pulley turning in the slot in the bed, said bed having a pair of eyes punched up therefrom fore-and-aft of the slot, and an axle for the pulley extending fore-and-aft of the machine and driven tightly through said pair of punched up eyes, said draw cord passing from the drum through the slot in the carriage bed and over said pul ley to its point of connection with the carriage.

14:. A sheet metal carriage comprising flat overlapping front and rear base plate sections, a feed rack formed integrally with one section of the carriage, and means for adjustably clamping the sections together, each ,of'

said base plate sections having an integral raceway-forming portion at one longitudinal edge thereof, said raceway-forming portions being shiftable toward and from each other by relative fore-and-aft movement between the portions of the sections and provided with rack teeth. v

15. A twp-part sheet metal platen carriage comprising amain section having a flat base plate portion formed at its ends with integral platen-supporting end plates perpendicular thereto and formed along its opposite longiage,

tudinal edges with an integral raceway flange gitudinal e ge with rack teeth to formal feed rack,v said raceway and rack flanges being disposed at the opposite side of said base plate portion of the main section from said end plates, and an auxiliary carriage section having abase plate portion overlapping and adjustably clamped to that side of the base 16. A two-part sheet metal platen carriage.

comprising a main section having a flat base plate portion formed atits ends with integral platen-supporting end plates perpendicular thereto and formed along its opposite longitudinal edges with an integral raceway flange and an-inte ral flange provided along its Ionand an integral flange provided along its longitudinal edge with rack teeth toform a feed rack, said raceway and rack flanges being disposed at the opposite side of' said base plate portion of the main section fromsaid end plates,.an auxiliary carriage section having a base plate portion overlapping and adjustably clamped to that side of the base plate of the main section at which the 'end lates are located, said auxiliary section eing formed along one longitudinal edge with an integral raceway flange between which and the raceway flange on the main section the rack flange on the main section is located,

and each of said end plates on the main section being formed with an integral drawn tubular bearing for a platen shaft.

17 An adjustable platen carriage comprising two pl ate-like base sections, and means for rigidly connecting the sections in different adjusted relation crosswise of the carriage, each of said sections having its fiat body part formed with an integral channel flange along one longitudinal edge thereof forming a raceway portion, the flat body part of one of said sections having an integral flange along its remaining longitudinal'edge lying between the two raceway portions of the car-.

riage and having its outer edge portion formed with rack teeth and bent into parallelism with the body part of said section to provide a carriage feed rack.

18. An adjustable platen carriage-comprising-two plate-like base sections, means for rigidly connecting the sections in different adjusted relation crosswise of the carriage, each of said sections having its flat body part formed with an integral channel flange along one longitudinal edge thereof forming a raceway portion, the flat body part of one of said sections having an integral flange along its remaining longitudinal edge lying between the two raceway portions of the carriage'and having its outer edge portion formed with flanges of the bed. rolling elements in the rack teeth and bent into parallelism with the,

bod part of said section to feed rack, and one of said ing a pair of integral carriage end lates bent up from its ends and each provi ed with a bearin for a platen shaft.

19. n a typewriting machine, the combination of a sheet metal carriage bed comprising a base plate formed with 11 standing longitudinal raceway flanges an also with an aperture substantially midway its ends, a sheet metal platen carriage comprising two provide a carriage overlapped base plate portions each formed with an integral pendent longitudinal race-' way flange opposed to one of the faceway' races formed by said carriage and bed flanges,

an integrhl L-shaped flange pendent from the 2 remaining longitudinal edge of the lowermost base plate portion of the carriage and formed along its edge with rack teeth lying parallel with said base plate portion to form a carriage feed rack, platen supporting end plates carried by one of said base plate portions of the carriage, clamping and guiding means for connecting the overlapped base plate portions of the carriage for relative transverse sliding adjustment and locking the same in desired adjusted relation, a feed pinion sha-ft extending through the aperture in the carriage bed, a carriage feed pinion on said shaft meshing with the rack teeth on said toothed flange, and means held to the ase sections hav- I T'plate portion, and means connecting said base plate portions for relative sliding adjustment crosswise of the carriage and locking thereof in adjusted relation.

21. A platen carriage having a sheet metal raceway part provided with integral rack teeth for a driving pinion for rolling elements traveling along said part, said raceway part being bent up longitudinally there- 'of from flat form, along a line bisecting the holes of a row of preformed countersunk holes therein, and having two angularly disposed lon itudinal bearing surface portions for antlfriction-rolling elements located at opposite sides of the fold line and at that face where the countersunk holes had the greater original diameter, and also having a row of integral rack teeth for a rolling-element-driving pinion each of which teeth extends transversely of the raceway part across the line of bend thereof and has side edges flaring toward each other toward the rolling element engaging face of the raceway part.

22. A platen carriage, support including a sheet metal raceway part cooperative with a carriage raceway part to form a race for antifriction rolling elements, said raceway part of the support being bent up longitudinally thereof from fiat form along a line bisectin the holes of a row. of pre-formed countersunk holesin said part and having two angularly disposed longitudinal bearing surfaceportions for the anti-friction elements located at that face of the part at which the preformed holes had the greater original diameter and also having a row of integral rack teeth for cooperation with a rolling elementdriving pinion, which teeth are narrowest at the rolling-element-engaging face of the raceway part and are formed by the webs of metal separating said countersunk holes in the raceway part. In testimony whereof I hereunto aflix my signature.

' ALONZO B. ELY.

cam wrench and the apertures in the uppermost base plate portion of the carriage being larger than said circular apertures for re ceiving the cam portion of the adjustingwrench.

20. An adjustable platen carriage having opposed raceway'flanges comprising two overlapped base plate portions each carrying one raceway flange of the carriage, a carriage feed rack carried by one of said portions lying between said flanges with its teeth extending substantially parallel with the base plate portions, said base plate portions having'a row of registering apertures spaced longitudinally of the feed rack and overlying the rack teeth, the apertures in the lowermost one of the overlapped base portions being smaller thanthose of the uppermost base

Images