US974686A - Portable scaffold. - Google Patents

Description

A. H. MOGHAN.. PORTABLE soAFIoLD. AJIPPLIUATIO'N FILED JUNms, 19'10.

3 BEEETS-SHEET 1.

Patented N ov. 1,1910.

A. H. MOGHAN. PORTABLE SCAFFOLD APPLICATION `FILED JUNE 23, 1910.

Patented Nov. 1, 1910.

3 SHEETS-SHEET 2.

974,ese.-

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A. H.1MGGHAN. PORTABLE. SCAFFOLD.

APPLICATION FILED JUNI-1243, 1910.

Patented Nov. 1, 1910.

3 sHEnTs-fsnnn'r AiiDIsoN H. Meenemen WASHINGTON, nisTEicT or COLUMBIA.

PORTABLE SCA-FFOLD.

Continuation of application, SeriaINo. 548,394, filed lviarch 9, 1910.`

Serial No. 568,516.

cal sectional view througgiidlicoghe To all whom t may concern.'

Be it known that I, ADDISON H. MCGHAN, of Washington, District of Columbia, have invented a new and useful Improvement in Portable Scaiiolds, which invention is fully set forth in the following specification. Y

My invent-ion relates to improvements in portable scaffolds for exterior or interior. work, and my principal objects are the pro.

vision of an inexpensive, rigid, sti'on and safe scaffold adaptable to widely di ering conditions, forms of walls, etc., and con` -striicted of a minimum number of parts capable of being quically put together' and taken apart by laborers or workmen of most ordinary intelligence. y

lThe novel and distinctive characteristics of theinvention by which these objects are accomplished may be most readily: understood from the following description, referring to the accompanying drawingsmvherem* v Figure 1 is a view in elevation showing the scaffold applied to the front-of a building; Fig. 2 is a view in plan showing its applica-` tion to a Vall having a projection, in the present instance a. bay-window; Fig. 3 is a view in end elevation of a scatold upright showing the manner of connecting' the scaffold to a window-frame; F ig. 4' is a view in plan showing the means for fastening they scaffold to a window-frame; Fig. 5 is a view in perspective ofthe clamp -for securing the platform-boards to ruiigs of the uprights-,f Fig. 6 is a view inplan. partly in section, and Fig. 7 is a View inside elevation with` the upright being in section showing overlapping ends of two scaffold-boards secured to a iung of an upright; Fig. S is a view in perspective of an attachment for connecting."

the braces to the window-sill; Fig. 9 is'a view in perspective of another forni of clamp for securing the j'ilatform-boards to I the iungs of the uprights; Fig. 10 is a view j in vertical section showing` the clamp of Fig.

9 used to connect overlapping ends of two i boards to a rung of anupiight; Fig. 1l isa detail view of a slightly different forni of brace from that. shown in the previous figures; Fig. 12 is a perspective view illust-rat-l ing supporting braces to lthe middle of a platform-board supported at. itsends on yiungs of ladder upiights; Fig. 13 is a verti- Specication of Letters Patent.

Patented Nov. 1, 1910. This application filed .Tune 23, 1910.

structure shown in Fig. 12;.and Fig. 1d is a view' similar to-Fig. 13 showing the use of a ladder section or unit as a brace.

rl`he scaifold of Figs. l to 7 comprises a series of sectional upright-s, the lower section of each of which consists of a single stile or standard l, preferably made of wood, and

provided near its upper end with a c'ross-,

head 2, the latter being supported at its ends by braces 2a and having in its upper edge two notches 2, 2". These sections 1 `of the uprights rest on the ground, pavement, or other supporting surface,-as the case may be, and carry or support the upper sections 2:3, which ,latter are in the form of ladder sections of coiiijiziiiitively short lengths so that they may be readily and easily handled by one man. I iind it convenient to employ intei'changeable and interlocking ladder sections of the character illustrated, which are obtainable upon the market. The side menibersl or bars `of t-he ladder sections 3 con verge slightly upwardly as shown iii Fig. so as to permit the upper end of each section to enter between the side members of the ladder section next above. rl`he ladder sections 3l are of the saine size and hence are interchangeable. They are each provided at the lower ends of their side bars with s-lots which receive the cross-head 2 of the base section t. or the projecting ends 4 of the top rung 5- of the nekt: lower ladder section 3. The lowerinost ladder section in each iipright rests on the cross-head 2 of the base section 1 with the slots at the lower eiids=of the side bars of said ladder section fitting about the cross-head 2 in the notches 2, 21. resi'iect'ively, thereby preventing saidlower section from shifting its position along the cross-head. l `urthermore, the lower rung of this loweriiiost ladder section is seated. in a recess or notch in theA top of the base ineinber l as clearly shown in Figs. 3 and 7, while .he upper ladder sections ar'e each suppoi'ted by interlockingA with .the ladder scctioii next below. turnbuckle Qaihaving hooked ends engaging respectively the crosshead 2 and the ower`rungof the ladder section 3 above. holds these parts in interlocking engagement. By thus making the lower sectioi'is of these uprights in the forni of a. single standard mr Stile, I obtain a num'- ber of advantages. For example, where they rest upon a sidewall; they present less obstruction than would lladder sectlons;

they 'cannot be easily climbed by children..

or by l-otliers who may. wish to use the scat# fold as a means of access to the house through upper windows; they may stand 1n` area-ways, between church pews, or in other.

y restrict-ed spaceswhich would not accommodate ladder sections. But, obviously,l 'for many locationsand uses of the scafold, ladvertical position and-connected by a sc alold'4 or. platform-board 6`which rests upon a supporting rung of the ladder section of eachupright, and is fastened to each of said rungsby y a'clamp 7. This clamp 7 is a strap or-bar-eX- tending across the board and havingdownwardly bent ends 8, 8, which closely engage the side edges of the board and are slotted or forked at 9 to receive and straddle 'the rung at'or near the opposite edges of the board. By this engagement of the ends 8, 8,

'with the edges of the board and the ladder rung, turning or'pivotal movement of the upright with relation tothe platform-board is prevented. Each. end 8 of the clamp 7 has two holes 10, 10, for receiving bolts 11 which pass under the rung, asl shown in Fig.

j fasten a single platform-board to a rung,

7. When a clamp 7 is used to embrace and bolts '11,"1-1, are passed through the upper 'of the two openlngs 10 in eachI of the ends 8 vofthe clamp; but where theclamp embraces and fastens overlapping endsfof two plat-- form-boards, as' illustrated in Fig. 7, the

bolts l1 pass through the lower holes 10; or, if 'y desired, two clamps of diii'erent dimensions may be'` employed, one for use with a singlefboard andl vthe other for use with overlapping boards. In either case, the

` clamps areprovided with two holes 11, 11a.

one of which is adapted to be brought into register with one of a series of holes 20 in a platform-board, or with two such openings 20 in overlapping ends lof two latformboards, and abolt 12 passes throug the registeivig holes to lockthe platform-board, or boards, against endwise movement'or dis placement.

Figs. 9 and 10 illustrate asomewhat dif ferent form of clamp from that of the previous figures; it comprises a stra or bar 26 extending across the `havlng downwardly.

. 'adapted to closely engage' the sidel edges oftheyboard, and slotted or forked at' 28 to receive and straddle the rung, asl in the"construction before' described. This clam also latformcard andf ent4 ends 27, .27,

adapted to be brought into register with one of the holes 20 of the platform-board, or with two such holes in overlapping ends of two boards, as shown in Fig. 10. A bolt 30 adapted to be passed upward through the registering openings has atoits' lower end a hook 31 adapted to engage about the ladder and carries a clamp nut 82 for drawing and holding the parts tightly together. 'lhis nut maybe sha ed for engagement of a wrench, or may ave wings thereon to be gripped and turned by hand. It will be noted that in this construction' of the clamp the singlebolt 30 serves the purpose of the three bolts 11,l 11 and' 12, and also dispenses with the provision of the openings 10 1n the bolt or pin 30 therefore not only passes throughs. hole in the board, but-as a means for fastening theboard to the 'rung there is a hook on the end 'ofthe bolt or pin embracing the rung. `By thus connecting the vplatform-boards to the rungs by the clamps the boards may project at either 4or. both against the possibility of tipping under'the weight of a workman. Furthermore, these cure to the rungs operate to tie the structure as a wholeand prevent lateral swaying and also turning movement of the uprights which latter is most apt to occur when lower single stile su ports are used.

After the Erst platform-board has been placed in position on the two uprights and efore or after it has been clamped to the latter, it is secured to a window-frame, as shown in Fig. 4, by the window struts 13 and the braces 14. Each strut consists of two rodsl or sections; a bearing plate 15 at the outer end of each rod is adapted to rest in the window-frame between the beads for theupper sash.' The inner ends of the rods are screw-threaded and connected by a turnbuckle 16. turn-buckle are of Such size as to permit of sleeve 17 slidably mounted on the strut rods, eachl sleeve carryin a set-screw or bolt 'by which it can be loc ed to the strut. What convenient form of brace -is shown in Fig. ,llginstead'of' having a sleeve orcircularl `o ening at its innerend into/ which a rod of t e' window-strut must befpassed before the strutis put in .,place, .thcbraoe of Fi 11V has an op'enlng or recess in the form o a hook 33 at 'its inner end adapted to be en aged ends beyond the uprights and be supported.

The rods or sections and the" rung, and at lits upper end is screw-threaded' construction of clamp first described. The l clam s closelyembracing the board and sea wide range `of adjustment thereby adapting e braces 14 are each provided with a 1s-now belleved to' be a preferable and more about a rod 34 ofthe strut after the atter has two holes 29, 29,. either one Lof which is thas been put infplace, and a set-screw or bolt `connected by a platfor and in other braces in the opposite direction.

r1`his renders the bracing more effective in eliminating parallelism between braces, the.

presence of which would to some extent sacrifice rigidity of bracing. At their outer extremities the braces 14 are bent at 4right angles to provide depending hooked ends 18 to engage downward through one of the holes 2O of a platform-board. The hole 20 thus engaged maybe in the row of holes nearest the building, or in the row of holes atl the outer edge of the board farthest from the building, according to whether it is desired to position the scaffold nearer to or farther from the wall. rIhis, in someinstances, is determined by cornices, ledges and `other projections from the wall of the building which must be cleared by the scaffold.

The holes 2() in the platform-board are very important. As already explained, they serve to receive a bolt of each fastening means or clamp by which a board is secured to a supporting rung, and toxbe engaged by the hooked ends 18 of the braces 14; they also serve as guides vin putting successive boards in place, as explained later. As illustrated, each board has a series of these holes 2O extending lengthwise thereof and arranged in two rows positioned, respectively, near the opposite edges of the' board. The holes in each row are equi-distant and the distance between holes in one row is the4 same as in the other row. Furthermore, the holes are staggered; that is to say, the holes of one row are'located between the holes of the other row, so that a line drawn across a board through a hole of one row will pass midway l)etweeirtwo holes of the other-row.

In practice, with boards twelve inches wide,

I have placed the holes in each row six inches apart from center to center and the rows of holes three inches in from the edges of the board. 'l'he holes 2t) are similarly positioned in all of the platforin-boards, from which it follows that the distancebetween any two widel)y separated holes used for clamps T of one board is thesame as that between two corresponding openings used for clamps' 7 of another board.

Two uprights having been positioned and iii-board, asbefore explaincd, the workmen next put 1n place a window-strut 13 and two in. Fig. 4.

l braces 14, as' shown With this much of the scaffold 4uprights and connect other platform-boards v be carried up to a considerable height, and

havmg four uprights erected in front of a ybe assembled in erecting the Sca thus securely fastened' to the building and braced against endwise movement, one or more workmen standing on the platformboard may add other ladder sections 3 to the between such added ladder sections at elevations above the -iirst board put in place, these added ladder sections and boards being most conveniently' passed up from below or drawn up by means of rope, with the assistance of 5 another workman upon the ground. In thus putting a second board- (and still others) in position above the first board, the workman has only to make sure to pass thebolts of lthe clamping devices `7 which secure the second board to its supporting rungs throu h holes 20 corresponding in position to t e holes that were used for the clamping devices of the First or lower board. The holes thus serve as guides, eliminating the necesassuring exact parallelism of the neighboring uprights and trueness and accuracy in assembling the parts, all of which are particularly essential where the scaffold is to effecting a symmetrical disposition of the parts which facilitates erection and in the finished scaffold (particularly large scaffolds of many uprights) assures equal and proper distribution of load and avoids undue strainsV upon individual parts. i

'lny number of uprights'may be used and the scaffold erected to plain walls and walls having projections; Fig. 1 shows 'a sbaffold building having a plain wall, while Fig. 2 shows a scaold having five or morev uprights erected around a bay-window. In Fig. 1 the lower level of scaffold boards 105 overlap at intermediate uprights and the overlapping ends are fastened to supporting rungs in the manner shown in Fig. 7. In Fig..2, overlapping ends of some of the boards are fastened together by bolts or pins 3T, 37, passing through registering holes 20 of the two boards, while in one instance (at the upper left hand end of Fig. 2) the overlapping ends are fastened together. by passing the hooked end 18 .of a brace 14 through 115 l registering openings 20 in both boards. It

1s thus apparent that the several parts of the scaffold are constructed and arranged for use with any shape of wall or front and 'adapted to`position'the boards within easy 120 yworkingdistance of the wall;.theA arts can oldjand taken apart in disassembling thaii'r without necessarily entering the building and Awithout defacing or injuring the Window-frames to which the struts arefastend or any other` part of the building. In disassembling the scaffold, the workmen begin at the top, -first removing the braces, struts, and clamps'of the upper boards, then said boardstheml selves, then the uppermost ladder sections of the uprights, and so on down.

It is important to note that by connecting the braces 14to the platform-boards the number and positioning" of uprights is not restricted by the number and location of window-openings; the uprights may be positioned irrespective of such openings and in such manner as to secure and maintain the before-mentioned symmetrical disposition of the parts. It is, therefore, apparent that from a-minimum number of parts, without making measurements, without lmarring or injuring a building, and (for an exterior scaffold) without entering the building, a strong and safe scaffold may be erected in a very short time by laborers-of most ordinary intelligence at minimum expense; and 'that the same parts are adapted to the ready construction'of scaii'olds erected to conform to widely different -wall structures and conditions. v. Y

Where the .platform-boards are called upon to support unusual weight, such as -a number of workmen on a `single board, or in addition to the weight of a workman'the weightofheavy materials, such as brick, it

may be found desirable to relieve the strain upon-the'board and upon the rungs upon whichit rests by the provision of means for also supporting the board at one or more points intermediate of the uprights betweenwhich it extends. I have illustratedsuch 'means in Figs. 12 and 13, wherein 40 and 41 are two ladder uprights resting upon the ground, or they may be parts of uprights having lower single stile supports,as in V Figs. 1 and 3. A platform board 42` hav` uprights. A hooked bolt 48.( similartothe hooked bolt 30 of Figs. 9 and '10) embraces the rung 47, and passes through one'of .the holes 43 ofthe boardto securely" fasten the board and rung together. -..Thefbi-ace -4'4 therefore not only prov'idesfan additional.`

support for the board, butrelieves'th'erun'g of ladder upright 40 upon'whiclrrthe-board another rung 49. 'Ihej brace. '1445, isv of@ 'such dimensions with relationy to 'the'v positioning of the holes 43 inthe board-andof the rungs Vright-angle between the board and 'the up near the other end and crosses under the board near its middle or intermediate-.of the rests by throwing some of theburdeniupon.

right. The brace may be engaged with a rung above orbelow rung 49, and the b0lt` Figs. 12and 13 show another brace 50, similar to brace '44, extending from ladder up right 41 to the board.-

Instead of providing aspecial construe' tion of brace, such `as.44 and 50, I may use for this' purpose one of the ladder units f or sections, like those vused in the uprights; but ladder sections used'forthis purpose are lless desirable because they proge'ct above the board presenting obstructions in the way of workmen. As shown in Fig. 14, 5 1 is a brace consisting of a ladder section or unit having the slotted ends ofV its side bars engaged with a rung `52 of a ladder upright 53 and locked in such engagement by a turnbuckle `connection 54.- The rung 57 at. the other end'of the brace 51 crosses under the' board 55 and is fastened thereto by a hooked bolt 56 passing through one of the holes in the board. The dimensions of the parts, positioning of the rungs and of the holes in the platform-board, are such as to give a right-angle between the board andI u right. It is evident that many slight c anges might be resorted to in the relative arrange-l ment of parts shown and described hereni,

without departingfrom the spirit and scope of my invention, hence I would have-itunder'stood that I do not'lwish to confine myself to the v.exact construction andarrangement of parts slown and described;

The present application is 4al continuation ofand substitute formy ap lication Seriall No. 548,394., iedMarh 9:1, 1910 (whiehf earlier application. `is to Abe"a'bando1i ed) as to all subject-matter common to the-two.

l/Vhat is claimed is 1. A scaold. comprising 'aeed, parallel vertical. standards "-fo'rmed jo lower single stile supports 4and upper opposed ladder sections, 4in combination wlthfloor' boards, means4 for ri 'dly connecting lthem to said ladders to hodthe lvertical standards parallel and-prevent,lateral swaying .or pivotal movementtheieofl 'aindmeans to connect said boardsl-intermediatethe 'standards vrigidly to theofpiposed inner faces of window frames.

` hecomblnation with u'pmghts anda 2# scaii'old board carried thereby and provided --wi'th holes near its edge, of an extensible 'strutfor-attachmentto a window frame, and

two braces adjustably-'mounted on sald'strut .andjhavingbentends tofengage holes in the scaifofl'dlooard'.'`.

3,:The`combinationwith uprights and a s'caifoldffboard carriedf thereby, the said .boar'd4 4"having a series of holes arranged alongbits edge', 'of an extensible strut for atjtaehment to a window frame, two braces Inova-bly` mounted on saidstrut and having lio bent vends to' engage the holes in-the scaffold i ,board and` means for locking the braces to thestrut.

4. In a scaffold, the combination with upright ladder members, a scaffold board resting on rungs of said ladder members and `braces for' connecting the boardto a building', of clamps embracing the board adjacent each upright memberpeach clamp-having a slotted end to straddle a rung of a ladderl section, and means'- for locking the clamp to its rung.

5. In a scaffold, the combination with upright laddermembers, ascaffold board resting on rungs of said ladder members and braces for connecting the board to the building, of clamps embracing the board adjacent' to each upright member'e'ach clamp having aslotted end to straddle a rung of a ladder section, and a bolt passing through each `clamp and the scaifold board.

6. In a scaffold, the combination of twoapproximately parallel uprights including opposed ladder sections, there being one or more such ladder sect-ions in each upribht; one or more platform-boards supported by rungs of opposed ladder sections; means for fastening the platform-board 'or boards to each of their supporting rungs thereby securingthe boards against endwise movement on said rungs and the yuprights at a fixed distance apart; and braces extending from said platform-board or boards and fastened to a building or other structure.

7. Ina scaffold, the combination of two approximately parallel uprights including opposed ladder sections, there being one or more suchladder sections in .each upright; one or more platform-boards each having therethrougha series of holes extending lengthwise vthereof and supported by rungs of opposed laddersections; means for fas-l tening the platform-board or'boards to each ofI their supporting rungs, thereby securing the boards against endwise movement on said rungs and theuprights at a fixed distance apart; andl braces each connected to a i platform-board by means engagin wone of said holes and. fastened to a bui ding or other structure.

8. In a scaffold, the combination of two4 approximately parallel uprights including 'opposedla'dder sections, there being4 one or more such ladder sections in each upright;

platform-boards each having therethrough a series of holes extending lengthwise thereof and sipported'by run s of opposed ladder sections; means for astening the plat- 'form'-boards to each of their supporting flfrungs, thereby securing the boards against 4endwlse movement on said rungs and the uprights yat a fixed distance apart, said means including at each 'supporting rung a strap extending across thie card 'and embracing said. rung7 and a boltk or pin pass-v ving through said stra and one of said openings in the board; an braces each connected to a platformfboard by meansengaging one of said holes and fastened to a building or other structure.

9. In a scadlold, the combination of two yapproximately parallel uprights .including ,opposed ladder sections, there being one or more such ladder sections in each upri ht;

yone or -more'platform-b'oards supporte -by rungs of opposed ladder sections; means for fastening the platform-board Vor boards to each of their` supporting rungs, thereby securing "the boards against endwise ymovement on s aidrungsl and the uprights at a* .xed distance apart; window struts engaging the frames of windows of a building; and' braces extending from said window struts and connectedto said platform-board or boards.

ying the frames of windows of a building;

and braces each fastened atlone end to a platform-board and at its other end having a hook engagingover a bar of its corre- :spending window strut and means for locking said hook in engagement with said bar.

11. In a scaffold, the combination of two approximatelyl parallel uprights including opposed ladder sections, there being one or more such ladder sections in each upright; one or more platform-boards each having therethrough a series of holes extending lengthwise thereof and supported by rungs of opposed' ladder sections; means for 'fastening the platform-board or boards to each of their supporting rungs, thereby securing the boards against endwise movement on said rungs and the uprights at a xed distance apart; window struts engaging thev frames of windows of a building; and braces each fixed at its inner end to a window strut and having a laterally bent' outer end engaging one of said holes through a platformboard.

12. In a scaffold, the combination of two approximately parallel uprights including opposed ladder sections, there beingone or mere such ladder sections in each upright;

vone or more platform-boardsl each having therethrough two rows ofholes extend- -ing len thwisel thereof, and supported by rungs o opposed laddersections; means for fastening the platform-board or boards to each of their supporting rungs, thereby se curing 'said-boards against endwise movement on said rungs and the uprights at a ving the frames of windows of a building;

and braces each fixed at its inner end to a' window strut and having a laterally bent outer end engaging one of said holes through i a platform-boardtherethrough a series *each connected to a 13. In a scaffold, the combination of two approximately parallel uprights including opposed ladder sections, there being one or more such ladder sections in each upright; one of more platform-boards each having of holes extending lengthwise thereof, and supported by rungs of 4opposed ladder sections;`fastenings for -securing each platform-board to its supporting rungs, the fastenings at each rung including a strap extending across the board and'having ends extending across the opposite edges of the board, each end also em` bracing the ladder rung,and a pin or bolt passingthrough said strap and into one of said holes through the board; and braces extending from said platform-board or boards and fastened to a building or other structure. A o v 14E. In arscafold, thev combination of two approximately parallel uprights including opposed ladder sections, there being one or more such ladder sections in eachupright; one or moreplatform-boards each having therethrough a seriesof holes extending lengthwise thereof, and supported by rungs of opposed ladder sections; fastenings for securing each platform-board to its support-1 m ing rungs, Vthe fastening at each rung cluding a strap extending across the board and having ends extending across the opposite edges of the board, each end also embracing the ladder rung, and a pin ory bolt passing through ,said strap and into one of said holes through the board; and braces means engaging one of the holes and fastened to a building or other structure.

, 15. vIn 4a` scaffold, the combination of three -approximately` parallelv uprights including opposed ladder sections, there being one or more such ladder sections in each upright; a` luralty of"platform-boards each having t erethrough a series of holes extending lengthwisethereof, and supported by rungs of opposed ladder sections; two of such boards overlappin each other at a 1 supporting rung of a la der section of the intermediate upright; means for fasteningl each platform-board to each of its supporting rungssaid'means including at each supporting rung avstrap extendingvacross the oard and embracing the rung, and a bolt or pin passing throu h of said holes in the oard, and where the boards .overlap through two ofsaid .holes/n 'approximately parallel u platform-board by,

`more lsuch laddersections in each boar toeach of their said strap and one.

`.the two overlapping ends; and braces each vconnected-to a platform-board by-means enxed'distance apart; window struts-engag-- gaging one of said holes and fastened to a building or other structure.

16. In a scaffold, the combination of two` one ormore platform-boards supported by rungs of opposed ladder sections; bolts, one passing through each platform-board at each of its supporting rungs,.'saidbolt having at one end a hook embracing the ladder rung and at its other end a screw-thread l engaged by a clamping nut; and braces ex-y tending from said platform-board or boards and fastened to a building or other structure.

17. In a scaffold, the combination of an upright ladder section; a platform-board supported by a rung of said ladder section; and a fastening for securing said board to said rung comprising a strap extending 4across said board embracing the opposite edges thereof and notched or forked to straddle the rung near each 'edge of the board; and a bolt or said strap and the boar 18. In a scaffold/the combination of an upright ladder section; -a latform-board supported by a rung of said adder section;

.and a fastening for securing said board to said rung comprisin k.a strap extending across said board em racing .the opposite edges thereof and notched or forked to ,straddle the lrnng4 near each edge of the board; and a 'bolt passing throughsaid strap and board, said bolt having at one end a hook embracing lthe ladder rung, and at its other end a screw-thread engaged by a clam ing nut.

y 19. 4 n'a scaffold, the combination of two rights including opposed ladder sections, t ere being one or two platform-boards extending between said uprights at diiferent elevations, each board being supported by rungs of opposed ladder sections and having therethrough a series of holes extendin being similarly positioned with relation to the holes in theother board; and means for fasteningtheplatform-boards supporting rungs, said means 'having at each sup orting run a bolt or pinpassing throug one of said holes of the board, the bolts or pins-for one board passlng through holes in said board correosition to the holes through sponding in which the b o ts or pins for the`other board 20. In 'a scaffold, the combination of two approximately parallel uprights including opposed ladder sections, t ere being one or 1pin passing through in each upright;

lengthwise thereof, .the holes t more Such ladder sections in each upright; two platform-boards' extending between said uprights at dierent elevations, each board being supported by. rungs of opposed ladder sections and having therethrough a 4series of y holes extending lengthwise thereof; and

means for fastening the platform-boards to' 21. In a scaffold, the combination oftwo approximately parallel uprights including 'opposed ladder sections, there being. one or more such ladder'sections in eachupright; two platform-boards extending between said uprights at diiiferent elevations, each board being supported by rungs of opposed ladder sections and having'therethrough a series of equidistant holes extending lengthwise thereot', the distance between the holes being the same for both boards; andmeans for astenf ing the platform-boards to each of their supporting'rungs,said meansl having at each supporting rung a bolt or pin passing through one of said holes of the board, the

bolts or pins for one board passing through holes corresponding in position to the` holes throu h which the bolts or pins for the other oard pass.

2Q. In a scaffold, the combination of two approximately parallel uprights including opposed ladder sections7 there being one or lmore such ladder sections in @leach upright; two platform-boards extending between said uprights at different elevations, Aeach board being supported by rungs of opposed ladder 'sections and having therethrough a series of equidistant holes thereof, the distance between the holes being vthe same for both boards; means for fastening the platform-boards to each of theirsupporting rungs, said means havingat each supporting rung a bolt or pin passing through one of said holes ot the board, the bolts or pins for one board passing through holes corresponding in .position to the holes through which the bolts or, ins for the ing witnesses. l

y y ADIDISON I-I. MCGHAN.

Witnesses: 4 t M. A. vWoon,

R. FITZHUGH.

extending lengthwise y ',other board pass; and braces tastened to a

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