US2180302A - Spacer element for typographical machines - Google Patents

Description

Nov. 14, 1939. A. e. SPERRY 2,180.302

SPACER ELEMEN'i' FOR TYPOGRAPHICAL MACHINES Filed June 15, 19:59 2 Sheets-Sheet 1 I I l I I 28 INVENTOR ARTHUR 6. SPE'RRY ATTORN EY Nov. 14, 1939. A. G. SPERRY SPACER ELEMENT FOR TYPOGRAPHICAL MACHINES.

Filed June 13, 1939 2 Sheets-Sheet 2 v INVENTOR ART/Ill]? 6. sPER/W TTORNEY Patented Now, 1939 UNITED STATES PATENT-[OFFICE sracan ELEMENT FOR TYPOGRAPHICAL MACHINES Amm- G. Sperry, Hollis, my Mm to Intel-type Corporation, Brooklyn, N. Y., a corpora tion of New York Application June 13,1939, Serial -No. 278,835

The present invention relates to improvements in typographical machines and more particularly to those of the general class disclosed in U. S.

Letters Patent 436,532 granted September 16, 1890, wherein circulating character bearing matrices and expansible spacebands released'respectively from suitable storage receptacles in response to manipulation of a keyboard are com posed into lines, the lines being delivered to a vertically movable transporter which presents them, while clamped endwlse, before a slug casting 'mold and thereafter raises the lines to a transfer channel where the matrices and spacebands are separated and subsequently returned to their places of storage.

The present invention deals particularly with improvements relating to the thin spacer elements commonly known as hair spaces" which.

are inserted in the composed line by hand, either between each matrix to produce letter spacing or between words to augment the spacing provided either by e'xpansiblespacebands or blank space matrices, the invention being directed to hair spaces of an improved design and means 2 for enabling their distribution at the time of transfer of the line inan orderly manner.

Hair space elements heretofore employed conform in size and shape to the usualcharacter bearing matrices including the usual upper and lower ears projecting edgewise, but being devoid of the combination distributor teeth provided on the matrices. As well known to those familiar with machines 'of the class referred to,.,when a line is moved into the transfer channel the matrices (which have an over-all edgewise dimension 4 less than the width of the channel) are fed onto, the ribbed bar of the usual second elevator which is projected into the channel at the proper time to receive and support the matrices by their combination teeth and to raise them out-of the channel upwardly to the distributor. Meanwhile, the spacebands, which are devoid of teeth but have lugs at their upper end that project edgewise' the matrices and-have neither teeth to support them on the second elevator bar nor lugs projecting in enough to engage the side rails of the channel, as .do, the lugs on spacebands, the-hair spaces: simply fall by gravity iii-rid. at random be-- twe'e'n'the' side walls of the channel during the transfer of thepline, it being intended thatthey tumble forwardly'thr'ough an elongated opening in the rout wall or-tn ensure! in o arc-tailed quad box secured to the front of the channel ad- Jacent to the bottom thereof.

This haphazard disposal of hair spaces out of a line has long been a' constant source of an-".

noyance and cause of delays since the hair spaces frequently lodge in various positions in the bottom of the transferchannel where they obstruct the progress of spacebands or they tumble clearof the quad box and fall on the floor where they are lost or damagedr I Theobject of the present invention is to overcome the above objections arising' from non-sup- -port of hair spaces by providing for their support on the usual spaceband supporting rails during circulation in the various channels of the machine including the transfer channel and the invention further provides for the complete and orderly distributionof hair spaces to a definite place of storage. To these ends the invention provides'hair space elements with a V'-shaped notchat the upper end thereof and having an upper set of lugs corresponding substantially in location and extent of projection to the supporting lugs on expansible spacebands, and lower .lugs or ears corresponding in location and projection to the similarly located ears on character matrices, the upper lugs serving to support the hair spaces on the usual'spaceband supporting rails of the machine and the lower lugs aiding to sustain them upright on the matrix supporttion further provides means such as teeth in the hair spaces and downwardly inclined rails on the usual center bar of the spaceband box, en-

gagement of the teeth on such rails providing support for the hair spaces in the spaceband box independent of thesupport afforded thereto by,

the spaceband supporting rails therein. The hair snaces thus supported gravitate toward the front of the box until stopped by a spaceband arrested in the usual manner at the forward end of the box. Upon release of such spaceband, however, the invention provides for escape ofthe succeed ing hair spaces forwardlly, an opening being pro-. 7

vided in the front w'all-of the box-of suitable.

shape and location to permit the free passage therethrough of hair spaces upon gravitation to the foremost position in the box, and a receptacle being provided for receiving and retaining the hair spaces-in a stack from which they may be removed by hand when needed. supporting teethonthe hair spaces may be located as de-- sired but preferably either atthe apex of the V-shaped notch therein or at the. upper end of the notch substantially in alignment with the supporting lugs. In the latter case aiurther fea, ture of the invention is the provision in the spacebands 'of notches in alignment with such teeth in the hair spaces to aiiord clearance for the hairv ing rails of the assembling elevator; The'invenspace supporting rails provided on the center bar of the spacebaud box. Y

In the accompanying drawings the invention is shown in two forms and by way of example, but

obviously changes and variations may be made therein. and inthe mode of application without departing from the spirit of the invention. It v is to be understood, therefore, that the invention is not limited to any specific form or embodiment except insofar as such limitations are specified in the appended claims.

Referring to the drawings: Fig. 1 is a partial front elevation of a typographical machine embodying thepresent inisllsn l F18. 2 shows in side elevation a standard matrix and spaceband and hair spaces according to the invention. h

Fig. 8 is an enlargement of I the spaceband box in Fig. 1 with the front plate removed to show the hair space supporting rail and storage receptacle according to the invention.

Fig. 4 is an end elevation viewed from the right of the spaceband box in Fig. 3. Fig. 5 is a section of the transfer channel taken on the line 5-5 inFig. 1.

Fig. 6 is a fragmentary section of the spaceband box taken on the line 8 -8 in Fig. 1.

Fig. 7 is an enlargement showing details of so glie sgaceband and hair space supporting rails 'in g. Fig. 8 is asection through the usual'assembling elevator with the hair space according to the invention supported therein. as Fig. 9 is a side elevation of the Jaws of the usual line transporter in Fig; 1 showing the hair space of the invention supported therein-on the usual spaceband rails, the transporter beingshown in casting position.

4o 1 Fig. 10 is similar to Fig. 6 but shows a modified form of hair space and supporting rails therefor in the spaceband box. 0 Fig. 100 is 'a'fragmentary view of the upper end of aspaceband modified as indicated in Fig.

5 10 to suit the modifie'd form of hair space therein.

into the transfer channel 22 to receive and supaieasoa opposed vise Jaws ll, m, before a mold M, Fig. 9, in which a type slug is cast against the characters on the matrices. I'bliowing the cast the transporter elevates the line to transfer position (shown in full lines in Fig. 1) where the line is pushed' to the right out of the transporter by movement of a pusher 20 from the dot-dash posi- 1 tion to the full line position in Fig. 1, the second elevator ribbed .bar 2| at this time being projected port the matrices by their usual combination teeth as the line is thus pushed into the channel 22. and to elevate the matrices to the usual distributor mechanism of the machine, not shown. During such removal of the matrices, the spacebands Y are supported in the transfer channel 22 by engagement of lugs 11 at the upper end thereof over side rails 23, 24 of the channel and thereafter are moved into compact relation by a second action to the right of the pusher ll (somewhat to the right of the full line position in Fig. 1) whereupon the usualspaceband transfer pawl 2! moves to the left until the hook-or shoulder 26 thereof engages over the lugs of the last spaceband to theleft in the channel. The pawl then moves all the way to the right (shown by dotdash lines in Fig. l) to thus move the spacebands along the rails 22, 24 until they arrive on the inclined rails 21, 28 in the spacebandbox It over which rails they slide by gravity, the leading spaceband finally resting at its upper end against the inner face of the front wall or plate 22 and at its lower end against the spaceband release Similar parts are designated by the same refer- .ence characters in the differentfigures- The present invention isapplicable generally to typographical machines of the'class illustrated wherein I represents a matrix magazine from which character bearing matrices stored therein fall by gravity between guides 2 of a vertical raceway or assembler front) in response to manipulation of keys of a keyboard. the matrices being I pickedup by an inclined belt 5 traveling past the lower ends of guides 2 and thereby directed over a rotating star wheel 8 into an upright edgewise position where they rest on opposed rails and 8 respectively on the front and rear walls 9, iii. of

w the assembling elevator'il.

' At desiredintewals during thecomposition of the lines spaceband key." is operated to release the usual wedgeshaped expansible spacebands Y from the spaceband storage box It and upon coms5 pletion of the line the elevator Ii is raised to position the line between fingers ll, ll of the so -called delivery slide which at the proper time is released to carry the line leftward through the delivery channel vIi into the vertically movable 7 line transporter ",the jaws i1 and" of which 4 at this time are in line receiving position represented by dot-dash lines inFig. 1. After thus receiving the line the transporter moves downlodge in such inclined, edgewise or fiatwise posi- The construction and mode of operation of the parts just described is well known so-that it is deemed sufiicient hereinafter merely to refer to details thereof in connection with the novel hair space of the present invention and'the means provided by the invention for accomplishing an orderly distribution thereof. I First, however, it will be helpful to review briefly the difiiculties encounteredln the use of the ordinary hair spaces which, as previously stated, conform in size and shape to the usual character bearing matrice X but are devoid of the distributing teeth a: p vided on the matrices and thus find no means of support when a line containing them is slid into the transfer channel 22. Referring to Fig. 5, such hair spaces Z are shown. by dot-dash lines resting in. haphazard fashion in the bottom of the transfer channel 22 instead of in the quad box 8 which is a receptacle especially provided at the front of the channelfor catching these hair spaces as they fall by gravity during the transfer of a line. it .being the intention that they be deflected forwardly by the inclined surface 22- into the quad box. Frequently, however, they are deflected clear of the box entirely and fall to. the floor or else they fall and tions along the bottom of the channel thatthey obstruct the passage of spacebands. I

According to the present invention ahair space element is provided having a set of supporting lugs atthe upper end thereofiwhich conformsubstantially in size and location (relative to the upper ears on matrices) tothe lugs I. on the wardly to present the line while supported on suitable rails thereinfand clamped endwise betwee expansible spac'ebands Y thus enabling 4 these elements to besupported during the operations of assembly, line delivery, casting and line'trans--* -i'er on' the same rails as are provided in the] machine for supporting the spitoebunds. At the lower end, there is provided a set of lo s (except asfhereinafter polnted'out) 2 I elevator Immediately behind it is a standard character bearing matrix X with distributing teeth a: and behindthe matrix is a standard spaceband Y. It will be observed that the hair space 3| is provided at its upper end with a set of lugs 32, 33 projecting edgewise therefrom substantiallyto the same'extent and of the same size as lugs y on the spaceband Y, and at its lower end with a set of lugs 34, 35 corresponding to the lower set of ears on the matrix X. Moreover, these upper and lower sets of lugs are spaced apart a distance greater than the spacing between the corresponding upper and lower lugs on the matrix, the upper lugs being located at such height as to project over the walls 3, ID of the assembling elevator when the lower lugs of the hair space rest on the normal matrix supporting rails as shown.

Hair spaces 3| may be inserted by hand at desired points in a composed line of matrices as heretofore, the front wall 9 or gate of the elevator being arranged to swing forwardly in the usual manner (see dot-dash lines in Fig. 8) to facilitate such insertion as well as other adjustments in a line preparatory to delivering it to the casting mechanism of the machine. The

. hair space 3|, Fig. 2, differs from the hair space line to the transporter;

3| only in that lower front lug is omitted so as to clear the usual auxiliary rail 9 in the assembling elevator II when the rail is brought into use, this rail when desired being projected inwardly by operating the handle so that. matrices may be aligned at a levelsuitable for casting against the lower character thereon in well known manner. Thus, hair spaces 3| or 3| may be'employed as required, the upper lugs on either form engaging over the walls 3, III

of the assembling elevator to support them in the same manner and at the same level as the spacebands are supported in the elevator.

In Fig. 9 the hair space 3| is shown supported in the jaws l1, l8 of the line transporter l6 by engagement of its upper lugs 32, 3,3 with the usual spaceband supporting rails 38, 33,,it being understood that these rails are coextensive with like rails in the delivery channel I 5 when'the jaws l1, l8 of the transporter l6 are in line receiving position (see dot-dash lines in Fig. 1) and with the top of walls 3, ll) of the assembling elevator when the latter is raised to deliver a From the description thus far it will be seen that hair spaces 3| or 3| are supported during the assembly, delivery, and casting operations on the same rails that support the usual spacebands.

At the line transfer position of the transporter I6, shown in full lines in Fig. 1, the rails 38, 33

, in the jaws l1, l8 align with the spaceband supporting rails 23, 24 of the transfer channel 22.

By virtue of the lugs 32, 33 herein provided on hair spaces 3| and 3| such hair spaces, like ,the spacebands Y, hang on the rails' 23, 24 as hair space by recessed or out be. k portions 48,

for accomplishing their orderly distribution into the usual spaceband box together with spacebands.

Such means comprises a set of opposed teeth 48 formed at the apex of the V -shaped notch in the hair space and longitudinally extending 10 cooperating rails 4| along the bottom of the centerbar 42 of the spaceband box and extending beyond the front wall thereof. The teeth 48 are located below the level of the lowermost teeth on the matricesin order to clear the ribs 15 on the second elevator bar 2| during transfer of a .line as best shown in Fig; 5. As the hair spaces and spacebands are moved along the rails 23, 24 of the transfer channel 22 by the pawl 25 they arrive on the downwardly inclined rails 21, 28 in the spaceband box and slide by gravity along these rails, the teeth 40 in the hair spaces engagingthe rails 4| atthe left end of bar 42 as they enter the box while the- lugs 32, 33 on the hair spaces and the lugs on the spacebands ride on the rails 21, 28, see Fig. 6. It is not essential, however, that lugs 32, 33 contact with rails '21, 28 once the teeth 40 areengaged with the .spacebands Y are shown at rest in the spaceband box 3, the elements behind the leading spaceband being retained against sliding to the right by reason of arrest of the leading spaceband, as usual, by engagement of the lugs at its upper end against the inner face of the front plate 23 and toward the bottom against the release pin 38. For reasons not concerned with the present in vention but only with the fall of spacebands when released, the rails 21, 28 are abruptly inclined toward their lower ends and terminate clear-of the inner side of the front plate as best shown in Fig; 7. The center bar 42 is provided with a thin de ressor blade 44 which contacts the bottom of the V-shaped notch in the space- I bands to urge them downwardly, for reasons hereinafter pointed out, in the event that they should not settle of their own weight to'the lowest "possible level as they slide toward the lower ends of the rails 21, 28. I As well known. at each operation of the release pin 30 the leading spaceband inv the box swings to a vertical position and falls by gravity through the usual chute 23", the lugs 1/ of the released spaceband being guided behind thefront wall or plate 23 of the chute as indicated by dotted. lines in Fig. 4. According to the invention the usual opening 45 in the front plate 23' is widened by symmetrical recesses 48, 41 so located as to lie opposite the upper- lugs 32, 33 on a hair space supported immediately behind the front plate on rails 4| and the opening is similarly widened opposite the lowerlugs of such 43. The width of these recessed portions is slightly greater than the over-all .width of a hair space across the upper and, lower lugs respectively and the center bar 42, orat least the hair space supporting rails 4| thereon, project through. v

of the hair spaces therethrough. The purpose of I 5 the downward urge imparted to spacebands by [blade 44 as they approach the lower ends of rails 21, II will now'be clear in that it assures that the lugs of a leading spaceband lie below such level as would permit them to pass through the i widened portion produced by the r 41 in the front plate 2!.

when a hair space becomes the leading element in the spaceband box (due to release of a spaceband positioned ahead of it) it immediately 15 gravitates along the ribs 4| toward the front plate 2!, the weight of succeeding hair spaces or spacebands or both aiding the gravitating move- -ment and the widened portions of the opening II, due to the aforementioned recesses, providing 20 for the free exit of one or of several hair spaces as the case may be through the opening. The hair spaces thus freed gravitate and pile up in an inclined stack in a suitable receptacle I0 secured to the cover plate 28 such receptacle having 26 side and bottom walls and being open at'the front to afford ready access to the hair spaces therein. This is best shown in Figs. 1 and 3, the latter figure showing a hairspace 3| infree'flight after having escaped through the opening 45 and the so former showing several hair spaces stacked in the receptacle SI from which they may be removed by hand as needed. As many hair spaces become freed from the spaceband box after release of a spaceband as may lie between the 35 released spac'eband and the next spacebandt -,'Ihusaspacebandwillalwaysbetheactualieading element ready as usual to bereleased in response to actuation of the spaceband key i2. The hair spaces ll or 3i are provided with an '49 elongated slot Ii in order. to clear the spaceband depresior bla'de l4 as they grsvitate on the The supportingteeth in the hair may be located at positions other than at the apex g of the V-shaped notch therein and this arrange,-

ment may be advantageous or even preferablefor certain adaptations of vthe invention. In

- fact, .the teeth may even be located above the level of the upper lugs if desired by merely 5o elongating the body of the hair space. In m. teeth l2, similar to teeth ll are provided, such teeth being located atthe upper end of the hair ing lugs thereon. In such case rails 58 are pro- 55 vided on the'center bar 42, these rails being located at the. proper level along the'sides of the bar to-coopcrate withthe teeth According to the invention the standard spaceband Y is modified to suit this arrangement ofm i-ting so teethandrails. 'IhisisshowninI 'ig.10awhere-- in the spaceband Y- is provided with notches ll of suitablesizetocleartherailsll. i

From the foregoing it willbe evident that the lugs as herein provided-at the upper end of-hair 05 spaces enable the latter to find supl rt-on all oftheusuaispacebandsupportingrailsofthe machineduring assembly, delivery and transfer of a line and moreover, these lugs 'together with the teeth in the hair spaces and cooperating rails 7 in the spaceband' box enables sn orderly distribue tion of the hair spacestogether with thespacebands, thus overcoming the objections encounteredwiththeordinaryhairspacesz. The 'meansprovided for permitting escape of the hair 75 spaces from thebpacebandbcx avoids supported. 7

with or disturbance to the ordinary function of the spaceband box or the release of spacebands therefrom. The lower lugs on the hair spaces aid H to sustain them upright on'the matrix supporting rails of the assembling elevator, that is, such lugs 5 aid in supporting the hair spaces when the gate of theelevator isswung open, it being apparent that at such time the upper front lugs momentarily lose the support afforded by the, front wall 8. 10

I claim as my invention: 1. In a typographical machine having channels provided with opposed rails for the support thereon of expansible spacebands circulating edgewise through the channels, a non-expansible spacer element having means adapted to support it during circulation on said spaceband supporting 2. In a typographical machine having channels provided with rails located at a given level for l engagement thereon of" the supporting lugs of 'expansible spacebands circulating edgewise in said channels, a non-expansible spacer element having lugs corresponding to the lugs'on the spacebands to thereby support it .for edgewise 6 circulation in said channels at the level of the spacebands. r i

3. In a typographical machine having channels provided with rails located at different levels in the opposed walls thereof for the support thereon respectively of matrices and expansiblespacebands circulating through said channels, 'a nonexpansiblespacer element having means adapted to support it for circulation at a level corresponding to the level of the spaceband supporting rails; 4. In a typographical machine having channels provided with rails for the support of expansible spacebands by engagement on said rails of 1118 projecting edgewise from the spacebands, a nonexpansible spacer element having edgewise pro- 40 :Iecting lugs corresponding to the lugs on the spacebands and adapted to support said element g on the spaceband supporting rails in saidchannels'.

g 5. In'a typographical machine having an assembling elevator provided with fixed and adiustable rails for the support of matricesedgewise thereon'at different levelsaccording to the po-- sitionof the adjustable rail, and provided also with spaceband supporting rails located -at a level above that of the matrix supporting rails, a hair space element having means adapted to effect its spaces substantially at the level of the supportsupport on the spaceband supporting rails irrespective of the level at which the matrices are 6.1n'a typographical machineha'ving-a line transfer channel and a spaceband box, each provided with rails-for the support 'ofcirculating spacebands and hair. space elements, said box having-means'distinct-from saidrails adaptedto so 7 support-the hair space elements in the box independent of the support afforded thereto by saidi. In a typographical-machine havinga linetransfer channel andaspacebandboxeachpros5 vided with railsforming a continuous support for spacebsnds space elements moved along the channel and into the box, said box having ad-' ditional railsadapted to engage the hair-space elements un nenterlng-the box and support m elements therein.

s. In a having asp'acc-.

band box provided with distinct sets of rails 3 adapted respectively to Wspacebands and,

hairspaceelementsinthebox. x

spacebands. gravitating on said rails, a set of similar downwardly inclined rails for supporting vhairspaces in the box, said latter rails extending beyond the front wall thereof and said wall having an opening therein for the passage therethrough of hair spaces gravitating on the hair space supporting rails.

11. In a typographical machine having a spaceband box provided with different sets of downwardly inclined rails for supporting spacebands and hair spaces respectively in depending fashion in the box, a device for releasing the spacebands, a wall spaced from the lower end of the spaceband rails to provide a passage for the escape of a spaceband when released, and an opening in said wall for the passage therethrough of the hair spaces.

12.- In a typographical machine having a spaceband box with a front wall andprovided with distinct sets of inclined rails for supporting spacebands and hair spaces respectively and for. guiding them by gravity toward the front wall of the box, said wall having means for arresting the spacebands and an opening widened by recesses at the upper and lower ends thereof for the passage through the opening of hair spaces gravitating on their supporting rails, and said hairspace supporting rails extending through said opening to thereby guide the hair spaces forwardly out of the box.

' 13. In a typographical machine according to claim 12 including as a further element the center bar of the spaceband box, wherein the hair space supporting rails are located on the center bar and the spaceband supporting rails are located on the side walls of the box, and wherein the latter rails terminate clear of the spaceband arresting means and below the level of the upper recesses in theopenin'g in the front wall of the box.

14. Ina typographical machine according to claim 12 including as a further element the center bar of the spaceband box, wherein the spaceband supporting rails terminate clear of the front wall of the box and the center bar is provided with a blade disposed in alignment with the apex of the V-shaped notch in the spacebands and engageable therewith to depress the spacebands'below the level of the upper recesses in the opening for the hair spaces in the front wall of the box.

15. In a typographical machine according to claim 12 whereina receptacle is provided at the forward side of the front wall to catch the hair spaces. passing through the opening-in the wall, said receptacle having side and bottom walls adapted to guide arid retain the hairspaces in a stackand having an opening at the front to --aflfor'daccess to the hair spaces.

-16..m a typographical machine having a spaceband box with a front wall and downwardly inclined rails for supporting spacebands gravi tating thereon to a position of rest against the innerface of said wall, a similarly inclined rail for supporting hair spaces gravitating thereon to a position of rest against the spacebands, spaceband releasing means, and an opening, in the front wall for the passage therethrough of the hair spaces upon release of a spaceband.

17. A hair space element adapted for circulation in the matrix and spaceband channels of a typographical machine, said element having at its lower end edgewise projecting lugs corresponding to similar lugs on matrices, and having at its upper end edgewise projecting lugs corresponding to the supporting lugs onspacebands and adapted to support said element during circulation in said channels. i

- 18. A hair space element adapted for circulationin the matrix and spaceband channels of a typographical machine, said element having upper and. lower sets of edgewise projecting lugs spaced apart a distance greater than correspond ing upper and lower sets of lugs on matrices and thereon or than the extent of projection of either set of lugs on the matrices.

19. A hair space element adapted for circulation in a typographical machine, said element having supporting lugs 'at itsupperend corresponding to the lugs on expanslble spacebands and having means distinct from said lugs for chine.

supporting it in the spaceband box of said ma- 20. A hair space element according to claim 19 wherein the means for supporting it in the spaceband box comprises opposed teeth or the like in the -V-shaped notch at .the upper end of the element. g i

21. A hair space element according to claim 19 wherein the means for supporting it in the spaceband box comprises opposed teeth' in the V- shaped notch at the upper end of the element,

. and wherein said teeth are located at the apex of said notch and below the level of corresponding teeth in matrices.

22. A hair space element according to claim 19 wherein the means for supporting it in the spaceband box comprises opposed teeth in the v-' shaped notch at the upper end of the element and wherein said teeth cooperate with rails provided on the center bar of the spaceband box. 23. A hair space element according to claim 19 wherein the means for'supporting it in the spaceband box comprises opposed teeth located at the upper end of the element substantially at the level of the supporting lugs thereon and wherein. d teeth cooperate with rails provided on the X- ter bar of the spaceband box.

24. In a typographical machine having a spaceband box provided with downwardly inclined rails in the side walls thereof for supporting the lugs of spacebands, an inclined center bar engageable in the v-shaped notch between the lugs in the spacebands for guiding them while gravitating on the rails, hair space supporting rails projecting from the sides of the center bar and cen 00 located at the. level of the supporting lugs on the spacebands, and notches in walls of the V- 'shaped notch in the spacebandsto permit clear* ance for the railsprojecting from the center bar.

' ARTHUR G. SHERRY,

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