US1550364A - Scaffolding - Google Patents

Description

Aug. 18, 1925. 1,550,364.

F.B.JOHN$TON SCAFFOLDING Filed Feb. 28, 1924 IN VEN T0 Patented Aug. 18, 1925.

UNITED STATES PATENT OFFICE.

I'RANK B. OHNSTON, OF NEW YORK, N. Y., ASSIGNOR TO AMERICAN SAFETY DEVICE COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

SGAFIOLDING. I

Application filed February 28, 1924. Serial No. 695,662.

This invention relates to scaffolding and has for its primary object to provide certain improvements in scaffolding such as is used by masons or workmen 1n the erection of a building in which there is rovided an unobstructed workmens plat orm and means for supporting the mortar, brick or other materials so that the same will be easily accessible and not necessitate frequent stooping by the workmen.

More particularly, I propose in one em bodiment of my present improvements to provide a main material receiving platform suitably supported by hoisting devices, and a subjacent workmens platform suspended from the material receiving platform and extending laterally beyond one side thereof.

It-is one of the important objects of my present disclosure to provide adjustable 7 means for suspending the workmens platform from the material receiving platform whereby the former may be readily adjusted and positioned so that it will not encounter cormces or other projections from the wall being erected as the scaffolding is raised or lowered. This suspending means for the workmens platform has another important advantage, in that should one of the hoisting cables break, the weight of the materials on the main platform will cause the workmens platform to be automatically swung inwardly and tightly bear against the face'of the building wall so that through the medium of the suspending means, the main platform with the materials thereon will be sustained against complete collapse. The improved scaffolding also enables the main platform to be loaded with the materials without interference with the workmen upon the subjacent platform.

It is a further general object of the invention to provide scalfolding of the above character the several parts of which may be easily and quickl connected in operative relation, and-whic is strong and substantial while relatively light in weight.

With the above and other objects in view, the invention consists in the improved scaftion whereby folding and in the form, construction and the workmens platform in normal position with respect to the building wall in full lines and in dotted lines in an adjusted posisaid platform may pass a projecting cornice in the vertical adjustment of the scaffolding;

Figure 2 is a fragmentary side elevation of the scaffolding;

Figure 3 is a detail sectional view taken on the line 33 of Figure 1;

Figure 4 is a similar section taken on the line 44 of Figure 1 and,

Figure 5 is a view similar to Figure 1 illustrating another adjustment of the workmens platform, whereby the latter may be positioned closely adjacent the face of the wall between vertical piers or columns.

As herein shown, the main platform which supports the mortar, bricks and other masonry materials, consists of a plurality of boards 5 which are laid in parallel relation in a common plane and supported upon spaced putlogs each of which consists of a pair of angle bars or beams 6 disposed in spaced parallel relation to each other. At their opposite ends these angle bars have 7 their vertical flanges connected by the spaced bolts 7 which are engaged upon the base portion of the angular stirrup or frame 8 of a hoisting device, said base portion of the frame being positioned between the angle bars 6. The outer boards 5 of the platform also extend between the parallel upwardly projecting side portions of the frame 8. Thus it will be understood that the boards of the platform and the angle bars 6 constituting the spaced ,putlogs are substantially locked together so that their independent relative movement transversely of the scaffolding is prevented.

The hoisting devices above referred to constitute no-essential feature of my pres ent disclosure and may be of any'approved detail construction. However, 1 preferably a said platforms by means of the link secure to the outer side of each stirrup of frame 8, the lower end of an upright 9. These uprights are provided for the purpose of supporting a cover or canopy (not shown) which serves as a protection for the workmen or masons so that they will not be injured. by materials falling from above.

To the vertically positioned flanges of each ofthe angle bars 6, bracket plates 10 are secured by the bolts 11 at points adjacent the opposite ends of said angle bars. Between these brackets, the upper endsof the suspension bars 12 are pivotally suported upon the bolts or rivets 13.' The ower ends of said bars 12 extend between the transversely positioned angle bars 14 to which-theyare pivotally connected by the bolts 15. The bars 14 at one of their ends extend a considerable distance laterally beyound one of the suspending bars 12, said projecting ends of the angle bars 14 throughout the length of the scaffolding being connected with each other by the relatively wide longitudinally extending plate.

16. Between this plate and the suspension bars 12 next adjacent to the wall of the building being erected, the boards 17 constituting the workmens platform are positioned upon the ends of the bars 14. Thus it will be seen from reference to Figure 1 that when the suspension bars 12 are perpendicularl positioned, the workmens platform 1 projects laterally beyond the edge of the material receiving platform 5.

The subjacent workmens platform may be laterally adjusted with respect to the platform 5 and the suspension bars 12 retained in various angular positions with resppct to ar 18 one end of which may be adjustably connected with the suspension bar 12 which is next adjacent to the workmens platform 17 by means of the bolt 19, said bolt being engaged through any one of the series of longitu-' dinally spaced openings 20 in the suspension bar. Intermediate of its ends the link bar 18 is twisted so that the free end thereof is disposed in a plane at right angles to the end portion of the bar which is connected to the suspension bar 12. This free end of the.

hnk bar terminates in a sleeve 21 which is 'ada ted to be disposed between the spaced ang e bars 6 of the put log to receive the bolt 22. Each of the angle bars is provided with longitudinally spaced bolt receiving open-' platform 17 in lateral spaced relation be platform 5 and rigidly retain the workmens platform in such position that the longitudinally extending plate is disposed closely adjacent to the face of the wall being erected. As shown in Figure 1 of the drawing, when the workman or mason is positioned on the platform 17 the material receiving platform is of such elevation above the workmens platform that the workmen may have easy access to the materialson the latter platform without stooping 0r bending from an erect or standing position. Thus the erection of the building wall will be greatly expedited. Also, it will be seen that owing to the provision of the subjacent workmen s platform 17, the materials may be loaded upon the platform 5 without in an wayobstructing the movements of the wor en, thereby further eliminatin loss of time in the building operation. f course it will be understood that the scafiolding' may be so constructed that the platform 5 is sufliciently'wide to receive wheel-barrows and permit workmen to easily pass each other, or on the other hand, this platform may if desired, be made relatively narrow.

In many cases, the wall being erected is provided with one or more cornices or ornamental projections such as is indicated at 24, and if it is necessary to raise or lower the sc'afiolding, the workmens platform may be readily positioned as shown in dotted lines in Figure 1 of the "drawings so as to permit said platform to safely pass by said cornice 100 or projection by merely adjusting the connection of the link bars 18 to the supporting ,putlog for the platform 5. After the scaffolding has been properly adjusted by means of the hoisting devices, the connection of the link bars 18 with the putlogs is again changed so as to return the workmens platform to its former position closely adjacent to the face of the building wall.

i As shown in Figure 5, the workmens platform may also be projected outwardly further beyond the side of the main platform 5 to extend between vertical piers or columns of the building wall by adjusting the connections between the link bars 18 and the suspending bars 12 having the openings 20 therein which'adjustably receive the pivot bolts 19. .Thus it will be seen that the improved scaffolding is readily adaptable for.

use in connection with various conditions which may be encountered in the erection of buildings of various types of architecture.

.It will also be noted from the foregoing de- Y scription that the weight of the materials on the platform 5 is disposed outwardly of the workmens platform 17. Therefore, in the event that one of the suspension cables should break, articularly in the arrangement shown in igure 1, the sagging of the main platform would cause the subjacent workmens platform to be swung inwardly towards the face .of the building wall through the connections between the putlogs 7.and the bars 14. The plate 16 being thus forcedinto tight bearing engagement aganst the face of the wall will sustain the scaffolding against complete collapse until the necessary repairs can be made.

From the foregoing descriptlon considered-in connection with the accompanying drawing, the construction, mannerof operation and several advantages of my improved scaffolding will beclearly and fully understood. It will, be seen that the apparatus is relatively" simple and that the several parts employed can be easily and quickly connected in proper operative relation. By the provision of the separate workmens platform suspended below the main platform in the manner explained, it

is obvious that the work may be greatly facilitated. Ihe scaffold structure as here in described is such as to'provide a very rigid andsubstantial working platform for the workman upon which he may freely move without obstruction while at the same time he can have easy access to the masonry materials without frequent bending or stooping or other undue exertion. When thescaifolding is not in use, the several parts thereof may be disconnected and very compactly arranged for storage purposes.

I have herein illustrated and described an embodiment of my present improvements which I have found to be entirely practical in operation. Nevertheless, it will be understood that the present disclosure is merely for theopurpose of illustration and that the several novel "features of my invention might be exemplified in numerous other alternative structures. Accordingly, I reserve the privilege of resorting to all such legitimate changes in the form, construction and relative arrangement of the several parts .as may be fairly embodied within the-spirit and scope .of the invention as claimed.

I claim:

1. Scaffolding, comprising a material receiving platform, a subjacent Workmens platform, adjustable suspension means susthe workmens' platform in suspende relation. to the material receiving platfo 'm, and means'conne'cted between said platforms for positioning the workmens platform under or vadjustably to one side of'said material receiving platform.

2. Scaffolding, comprising a material receiving platform, a' workmens platform, and means for suspending the workmens platform in subjacent relation tothe material receiving platform,-said means including pivotally movable suspension bars, and adjustable link bar connections between suspension bars and the material receiving platform whereby theworkmens platform may be located in various transversely adjusted positions with respect to the material receiving platform.

3. Scaffolding, comprising putlogs having hoistingdevices connected therewith and a material receiving platform supported up on said putlogs, a workmens platform, and means for suspending the workmens platform in subjacent relation to the material receiving platform, said means including supporting bars for the workmens platform, suspension bars pivotally connected with said supporting bars and'with the putlogs, and adjustable link bar connections between certain ofv said suspension bars and the putlogs whereby said workmens plat- 4. Scafiolding, comprising a material receivlng platform, a workmens platform having supporting bars extending transversely under said material platformand in subjacent. relation thereto, a pair of parallel supporting links pivotally connectedwith each of said bars and with the receiving platform whereby said workmens platform is adapted to swing transversely with respect to said material platform from one position with respect thereto to another, and a rigidly connected member between the material platform and a supporting link of the workmens platform for securing said workmens platform in various positions.

with respect to said material platform.

5. Scaffolding,comprising a material receiving platform, a subjacent workmens platform projecting laterally beyond one 'side of the material receiving platform,

means whereby said workmens platform may be moved sidewise with respect to said material receiving platform, a rigid connecting member between the two platforms for securing the wordrm'ens platform in adjusted position, means above thematerial receiving platform for suspending the twoplatforms as a unit at various elevations, and means mounted on the upper side of the receiving platform for raising orlowering the platforms while the workmens platform is held in its adjusted position.

In testimony that I claim the foregoing as my invent1on,I have signed my name hereto.

' FRANK B. JOHNSTON.

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