US1187060A - Scaffold. - Google Patents

Description

E. 1. GOLDEN.

SCAFFOLD.

APPLICATION FILED mac. I6. 1915.

Patented June 13, 1916.

2 SHEETS-SHEET I.

frat/81%;. mafia 162mm,,

UNITED STATES PATENT ormon.

EDWARD J'- GOLDEN, OF CHICAGO, ILLINOIS, ASSIGNOR T0 CHICAGO SOAFFOLD COMPANY, OF CI-IICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SCAFFOLD.

To all whom it may concern:

Be it known that I, EDWARD J. GoLDnN, a citizen of the United'States, residing at Chicago, in thecounty of Cook and State of Illinois, have invented new and useful Improvements in scaffolds, of which the following is a specification.

My invention relates to improvements in scafi'olds of the type involving a series of cross-pieces upon which the planking of the scaffold is laid, -and hoisting frames concables serving to support the scaffold at the desired elevation; and my invention also relates to hoisting frames in general.

Certain of my objects are to provide improvements in the meanssecuring the hoisting frames to the cross-pieces, to the end that the structure will be rendered safe, relatively light in weight and economical of construction; to provide novel, simple and economical means for. supporting an overhead covering for the scaffold; and to provide improvements in hoisting frames.

Referring to the accompanying drawings,

Figure 1 is a perspective detail view of a scaffold constructed in accordance with my invention. Fig. 2 is a view in elevation of the lower end of one of the hoisting frames. Fig. 3 is a section taken at the line 3 of Fig. 2 and viewed in the direction of the arrow. Fig. 4 is a view in side elevation of one of the similar hoisting frames employed, to

gether with the operative parts carried thereby. Fig. 5 is a view of the structure shown in Fig. 4 but viewed at a right-angle thereto, and Fig. 6-is a'plan view of one of the two similarly shaped ends of each crosspiece.

In the drawings, I have shown a scaffold made up from but two cross-pieces, for clearness of illustration, though, as. hereinafter explained, as many of the cross- Specification of Letters Patent.

Patented June 13, 1916.

r Application filed December 16,1915. Serial 1%. 67,199.

pieces as desired may be used, the crosspieces being illustrated at 7, and preferably formed of metal having horizontally extending flanges 8 along their upper edges, the particular cross-pieces shown being of L- shape'in cross-section. Each cross-piece 7 carries two hoisting or drum supporting frames represented at 9, Fig. 1, these frames being secured to the crossbars at the ends of the latter, by constructing them as follows:

Each of the frames 9 is formed of two side-members 10, which are shown as, but need not necessarily be, separate members secured together in spaced. relation by cross bars 11 carrying spacers 12. The ends of the cross-bars 11 are threaded to receive nuts 11 for clamping together the parts of the hoisting frame, the nuts on the upper- 'most bars terminating in eyes 11 which latter serve to receive and hold a guardcable (not shown) for the platform of the scaffold. jThe lower ends of the side-members 10, which preferably are turned back upon themselves to form eyes 13, are slotted, as indicated at 14', at which slotted portions these frames straddle the vertical web of the cross-piece 7 and are rigidly secured in place thereon as illustrated, by bolts 15,

which pass through the eyes 13, and regis- V cable-operating means illustrated, form the subject of an application for United States patent copending herewith, and a brief description'thereof will, therefore, suflice. In

each of the frames 9 a shaft 18 is ournaled,

each shaft carrying a drum 19' about which the lower end of the cable 17. with which it cooperates, is 'wound, the cable 17- passing 1 over a pulley 20 journaled on the uppermost spacer 12. Rotatable upon and shiftable longitudinally of the shaft 18 is a lever 21, between which and the adjacent side 10, a coil-spring 22 is interposed. The lever 21, cooperates with a circular series of teeth 23 projecting laterally from one end of the 19 to be rotated in an anti-clockwise direction, in Fig. 4, to wind the cable upon the drum, and thus elevate the scaffold. The pawl 26, rigid on a sleeve 27, journaled on the spacer 12 immediately above the shaft 18, cooperates with ratchet-teeth 29 on the drum 19, and prevents'the drum from rotatingin the direction opposite to that in which it is rotated when actuated by'the lever 21. When, however, it is desired. to lower the scaffold by unwinding the cables, the pawl 26 may be-readily swung out of the path of movement of the teeth 29 while the drum is rotating in a clockwise direction, under a resistance presented by the operator bearing down on the lever 21 sufficiently to per- 7 mit the cableto'payout at the desired speed, the pawl 26 being swung manually into engagement with one of the teeth 29 each time the "lever 21 completes an upward movement. 7

The planking represented at 39 and "which would extend substantially parallel with the side of the building adjacent to -which the scaffold would be hung, extends from, and is supported by the cross-pieces 7 as represented in Fig. 1., It is preferred that some means be provided for preventing the planking from shifting cross-wise of the cross-pieces 7. Amy desirable means may be employed, those shown, however, being preferred, and comprising plates 31 having notches 32 in one edge. These plates are nailed, as indicated at '33, to the upper surface of the planking adjacent the outer side of each frame 9, to straddle said side at the notches 32 in theseplates, as represented moreparticularly in Figs. 2 and 3.

Where the scaffold is to be of such length that it is either impossible or impracticable to form the platform of single lengths of planking, it is necessary @to break joints.

7 By preference this would be done as shown in Figs. 2 and 3, namely, by overlapping the adjacent ends-of the-planking where they extend over the cross-pieces 7 in which case, by preference, each plank adjacent the leveris depressed, and this causes the drum frames 9, is provided with a plate 31, as hereinbefore explained.

It will be readily understood from the foregoing that by constructing a scaffold in accordance with my invention, a safe and economical form of structure may be produced at relatively small cost.

I It is oftentimes desirable that a roof be provided for the scaffold to protect the workmen or materials supported on the platform. This I accomplish in a very simple and economical way by providing a series of uprights 34, one for each hoisting frame. These supports are in the form of bars of metal applied flatwise to the outer faces of the outermost frame-sides 10, and held thereto by certain of the bolts 11 and shaft 18. The upper ends of the uprights 3 1 are connected together by bars 35, which form supports for planking 36, as represented, or, if desired, a canvas or tarpaulin covering may be supported from the frame work thus provided.

While I have illustrated and described a particular construction embodying my invention, I do not wish to be understood as intending to limit it thereto, as the same may be variously modified and altered without departing from the spirit of my invention.

Vhat I claim as new, and desire to secure by Letters Patent, is

In a scaffold, in combination, a pair of cross bars having flanges at their upper edges with portions cut away, hoisting frames at the ends of each cross bar and rigidly connected therewith at the cut away portions, each'frame comprising a relatively long outside member and a short inside member, a drum mounted between said members about which a supporting cable is adapted to be wound, pawl and ratchet mechanism associated with said drum for controlling its movement in one direction, a second pair of cross members connecting said long outside members adapted to support a covering, and a floor positioned on said first pair of cross members, said floor having means associated with the boards adjacent the hoisting frame adapted to coact therewith and prevent relative movement of the frames toward or from each other. a V

EDWARD J. GOLDEN.

In the presence of 'D. G. THORSEN, A. O. Fisoirnn.

' flopjes 'of this patent. may be obtained for five cents each, by addressing theflolnmissioner of Patents,

Washington, D. C.

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