US1035595A - Adjustable scaffold. - Google Patents

Description

G'. JOHNSON.

ADJUSTABLE SOAFFDLD. APPLICATION rILnD rg. 3,1912.

. 1,035,595. Patented Aug. 13,1912.

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? 44 5l "Y I Z 25B ATTORNEY G. JOHNSON.

ADJUSTABLE SOAFFOLD. APPLmATIoN FILED 211B. a, '1012.

1,085,595. I Patnted Aug. 13,1912.

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G. JOHNSON.

ADJUSTABLE SOAFFOLD.. APPLICATION FILED 1113.3, 1912.

` 1,035,595. Patented Aug. 13, 1912.

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GUSTAV JOHNSON, F CLEVELAND, OHIO.

ADJUSTABLE SCAFFOLD.

Speccation of Letters Patent.

Patented Aug. 13, 1912.

Application led February 3, 1912. Serial No. 675,319.

To all whom it may concern Be it known that I, GUsTAv JOHNSON,

citizen of the United States, residing at- Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new l and useful Im rovements in Adjustable tures, the scaffold being mounted within the structure, and capable of being raised as the work progresses.

The apparatus comprises an upper part or superstructure which can be raised or lowered by means of screw rods connected thereto and to a support below, theIl support being mounted on four (more or less) posts, which are built` up as the upper structure is raised. The upper structure also includes special devices for supporting the working platform, and for centering and holding the superstructure in place within the chimney or furnace.

In the drawings,-Figure 1 is a side elevation of the scaffold. Fig. 2 is a top plan. Fig. 3 is an enlarged detail of part of the upper structure. Fig. 4 is a detail in side elevation of one of thecentering devices.

Fig. 5 is a perspective View of a section of one of the posts.

Referring specifically to the drawings 12 indicates a ring or frame, preferably made of angle iron, and forming the bottom member of the superstructure which supports the platform, and this is connected by uprights 10 to an upper ringer frame 30. A series of brackets are pivotally mounted on these frames, to swing in or out or expand or contract, to acfcommodate the scaffold to the structure being built, and to support the platform on which the workmen stand, at the tcp. Each bracket consists of a lower inclined arm 9 and an upper horizontal arm 32. The 4 former is pivoted at its lower end to a lug 33 projecting from the lower ring 12, and the latter is pvotally hooked at its inner end into a lug or eye 34, projecting from the upper member 30, and the arms 9 and 32 are fastened together at the outer end of the latter, as indicated at 35, and the bracket thus formed will swing on a vertical pivot in or. out. The upper ends of the respective arms 9 of the brackets are connected by links 16, having slts 17 through which the ends of the arms 9 project, so that the various brackets are coupled together.

For swinging the brackets in or out they are divided into several sets, each comprising four, more or less, and each set is operated by a lever 10 fulcrumed on one of the uprights 10,` and connected to a plate 11 which is ided by a pin 14 projecting from the uprlght 1() and through a slot 13 in the plate 11. The plate 11 is fastened to a bar 15 which can slide on the frame 12. This bar 15 is connected .by pins 18 to short crank arms 25 projecting from the members 9 of the brackets, the cranks 25 being fastened to the arms 9, a short distanceabove the pivoted lugs 33 and the pins`18 working in slots in said cranks 25. Thereby, when the lever 10LL swings the plate 15 will be shifted one way or the other, and by means of the crank connections to the bracket members 9, the respective brackets will be adjusted or swung in or out to the desired extent. The outer ends of the boards 36, forming the u per or working platform, rest on the link on the upper frame 30, and these boards may be set in place after the supports are ad'usted. l or centering the device in the chimney or furnace, and preventing any slip, I provide a number of levers 6 which are pivotally connected at 6 to the lower ring 12, and extend therefrom upwardly and outwardly at an incline, and the upper ends of these levers carry hinged blocks 7 of rubber or similar material. Each lever may be adjusted topress the blocks against the inner surface of the chimney by means of' a screw 40 operated by a nut 41 rotatably connected to a block 42 which is pivoted at 43 to a bracket 44 fastened to one of the uprights 10. The pivoted block 7 accommodates itself to any inclination of the surface against which it is pressed.

The--hoisting devices are mounted on the superstructure by means of cross beams or pieces 46 fastened to post sectins 23b which support said superstructure, by vsuitalilc brackets or connections some of which are' indicated at 47. The gear 19 is driven by a motor 48, and meshes. with pinions 19 on shafts 20 which have worms 20 at opposite ends meshing with worm gear nuts 21 which travel on screws 21, the nuts being set in suitable castings 50 fastened to the beams 46,

s A16, and their inner ends site sides,

l Ithe like.

' place.

so that as tbe. nuts are raised "or lowered the said beams and the superstructure connected..

thereto will also be raised'or lowered. 'llie lower ends of the screws 2l are lrigidly supported by ars 26 at top and bottom, and the lower bars 26 are formed with brackets 22 suitable for bolting tothe plates 23 of the posts. These posts are made 'of sections comprising said'plates 23?, andangle irons 23a on oppo the. various parts being of different lengths, sa four and eight feet, to brea k joints every our feet, assuming that the screws willlift four feet, more or less, each time. A platform 60 may be supported on the'posts, under the superstructure, to protect workmen below from falling bricks or 'To raise the top or superstructure of the scaffold the inotor will be started' to cause the nuts 21 vto turn in proper direction to travel up the screws, the holding devices f2 being lirst s wun .in out of Contact with thewall This will cause the upper part of 25.

the structure to be raised. When the nuts reach the upper ends of the. screws, the motor is stopped, and the posts are then built up by the addition of pieces 23until support. lthe sections 23", lthe added lengths being suitably bolted or fastened in races 22`to the posts are removed,`and by reversing vthe motor the screws 2l and means of .posts X and platforms will enable a workman .to get at frames 26 are lifted a corresponding distance, after which the. brackets 22 are again bolted to the posts, ready for the next lift.\

lifted step by up 'to support Thus the upper structure is step and the posts are built the same, as the work progresses; and by reverse operation the structure. may be ytaken down.

By puttingI .a man at leach lever 10a the brackets may bey shifted simultaneously,

.around the platform. lf the bore of the chimney or structure being built is symmet# rical one adjustment will do. for the whole thing, lf Ait is varied in size the 4lnackets 9 may be swungV in or out accordingly.

For special purposes, platforms Z may be supported `upon the superstructure, by brackets..`l.l These the top and outer edge. of-a stack or--furnace For inside work,vas in relining a fur-1 stidened by braces Y 'fromthe' posts nace, these platforms and^brackets will be removed.4 .Also, the lower posts may be S, .designed to extend v to .contact with the wall of the. structure being built, These braces may beused or not as necessary. although the above specication refers to a motor for drii'ning1 the hoisting gear, it is to -be understood; that the hoisting devices sleeve pillars 51 lwith cross brace.

. fold may be Then, the bolts which connect the -Furthermore,

incassa .may be operated by hand and no limitation in this respect is implied.

The scaffold will preferably be built with two shafts for elevators, one onv each side of the center of the scaffold. Suitable safety p' ladders (not shown) will also be'provided.

What l claim as new is:

l. ln a scaiiold, the combination of supporting posts, set at corners to form an area therebetween, a` platform supporting structure mounted upon the posts, hoisting screws between the posts and the said structure, supports for said screws lon said posts, and located within said area,4 whereby the scafrneans carried by saidstructure and acting upon the screws to raise said structure', whereby additional post members vmay be added, said screws being Yconnected to said supports to lift the same, by turning the screws, to new position with respect to posts, for another operation.

2. ln a scaold, the combination of a.

frame, a

plurality of platform-supporting brackets ivotally connected at intervals to the perip ery ofl said frame and arranged to swing in or out, horizontally, toward or from said frame, and means to swing'the brackets in or out. I

.` 3'. ln a scaold, the combination .of a

ivo'ted to frame, a plurality of brackets ge of said swing horizontally at the outer e erected in a stack or the like,

the

frame, and connecting links between the brackets;

4. ln-a scaiold, the combination. of a supporting frame, a plurality of platform-supporting brackets pivoted.l at the outer edge vof said frame to swing in or out horizontally, connections between. said brackets, to

swing the same simultaneously, and means connected to said brackets to turn the vsame on their pivots.

'5. lin a scaffold, the combination of a supporting ytraine,brackets pivoted at the outer edge of said yframe to swing horizontally toward and from the same, a crank connected to one of the brackets, and a lever operatively connected tothe crank, for'the purpose described. y

6. The combination of posts, a platformsupporting superstructure verticallyadjustable thereon, vertically-swinging levers pivoted to said superstructure, blocks pivoted to the outer ends of the levers, and means to swingthe levers outwardly, to press the blocks against the wall of a structurebeing built. y

ico

ln testimony whereof, I do aihx my signature in presence of two witnesses.

GUSTAV JOHNSON.

Witnesses: Y

JOHN A. BOMMHARDT, STEDMAN J. Rookwnnr...

@spiesof-thlspatentmey be obtained for ve cents each, by addressing the Commissioner o Patents, Washington, D. (2. o

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