US1549270A - Extension scaffold - Google Patents

Description

Aug. 11, 1925. 1,549,270

} A. LA BER EXTENSION SCAFFOLD Filed May 10, 1924 2 Sheets-Sheet 1 I v A v 2s {inventor A. LABER EXTENSION SCAFFOLD Aug. 11, 1925. 1,549,270

Filed May 1 1924 2 Sheets-Sheet 2 I vi -lng. iii, 1225.,

near

erase AUGUST ABER, or BALTIMORE, MARYLAND.

EXTENSION SGAFFOLD.

Application filed May 1 92%. Serial No. 712,179.

vented certain new and usefullmprovements f in Extension scaffolds, of which the follow ing is a specification.

This invention relates to portable scaf folds such as are used by painters, masons and other workmen in the construction of buildings and the like.

One important object of the invention is to improve the general construction of devices of this character. 7

A second important, object of the invention is to provide an improved'means for securing such scaffolds to the walls of a building or the like. i

A third important object of the invention is to provide novel means for securing the horizontal and vertical members of such scaffolds together.

With the above and other objects in view as will be hereinafter apparent, the invention consists in general of certain novel details of construction and combinations of parts hereinafter fully described, illustrated in the accompanying drawings and specifically claimed.

Gn the accompanying drawings like charactors of reference indicate like parts in the several views, and:

Figure 1 is a front elevation of a portion of such a scaifold as arranged for painting the corner of a house.

Figure 2 is a perspective view of a portion of a corner upright and showing certain of the horizontal members.

Figure 3 is a detail section on the line 83 of Figure 1.

Figure l is a detail section on the line l i of Figure 1.

Figure 5 is a detail section on the line 55 of Figure 1.

Figure 6 is a detail, partly in section, showing an end of one of the extensible window struts used herewith.

In carrying out the invention, in the form here disclosed, there is shown a series of uprights each preferably consisting of a ladder. These ladders are here shown as having continuous side members 10 and rungs 11 but it is obvious that each ladder may be made in suitable lengths connected. together, such construction being very common in the art and not necessary here to be shown as no particular claim is made to the use of such sectional or extension lad ders. i

I in order to secure these uprights to the sides of the building the-stiles or sides 10 of tie ladders are supplied with suitable clamps or grips each of which may be formed of a length of bar metal bent at one: end to an approximate U-shape grip 12 and at right angles to one of the legs of the U extends a shank 13 terminating in an outwardly extending flange 1 1. These grips are arranged in confronting pairs so that the side or stile 10 may be engaged between the U-shaped enos 12 of such a pair. In the shank portion are provided registering openings 15 for the reception of a holding bolt 16. A straight strut or tie bar 17 may be employed in connection with this clamp, the holding bolt passing through a suitable opening in an end of said tie bar located between the shanks 13 of a pair of grips, this form being used when ever the upright is located directly in front of the side edge of a window opening. If the upright is offset from such opening an angled strut or tie bar 18 is employed which is provided with spaced bolt openings 19 adjacent one end so that securing bolts 20 may be passed through these openings and through openings 21 in the flanges 14. It is obvious that the tie bars may be bent to different shapes to pass obstructions, reach around corners and the like.

111 order to secure these tie bars to the building extensible brace rods are employed each of which includes a centrally disposed turnbuckle 22 and two screw bars 23. Each screw bar has a pointed end 24 which engages a suitable opening in a stop plate 25, the opening being of such size as to receive the point without permitting such projection thereof as to materially injure the frame of a window in which the device is placed. One of these screw bars passes through a suitable opening 26 in a tie bar and, when the brace rods are placed in position in a window frame and the screw rods extended by turning the turn-buckle, thus securing the tie bar firmly to the building.

The horizontal members or planks 27 are supported on the rungs l1 and are held from longitudinal movement by hook bolts 28 passing through openings in the planks and nuts 29. These hook bolts preferably have their hooks at the lower ends and these hooks engage beneath a rung of the ladder as shown. Preferably the hook bolts are of sufiicient length to match up to the next set of planks so that all the planks between the top and bottom levels are tied down by a downwardly extending hook bolt and held from longitudinal movement by an upwardly extending hook bolt. 7

At corners one of the planks meeting the corner upright rests on the other plank and extends at right angles thereto being notched as at 80 to receive the ladder stiles or sides and to permit a portion of such plank to extend between, said stiles so the hook bolts may pass therethrougl'i. Guard rails 31 may also be provided'as shown.

ItJwill be seen that the construction just described provides a readily portable and entirely safe scaffold which can be easily erected; or removed.

There has thus been provided a simple and efficient device of the kind described and for the purpose specified. a a

It isobvious that minor changes may be made in the form and construction of the invention without departing from the. mate rial spirit thereof, It is not, therefore, desired to. confine the invention to the exact form herein shown and described, but it is desired to include all such as properly come within the scope claimed.

Having thus described the invention, what is claimed as new, is:

1. In a scafiold, the combination of two approximately parallel upright ladders, a. plurality of platform planks resting one above the other in spaced relation on vertically spaced rungs of the ladders, and a means for tying two of the planks toe gether and one plank to the ladder rung on which it rests.

2. In a scaffold, the combination of two approximately parallel upright ladders, a plurality of platiorm planks resting one above the other in spaced relation on vertically spaced rungs of the ladders, and a means for tying two ofthe planks together and one plank to the ladder rung on which it rests, said means comprising a hook bolt passing vertically through two of the planks and having a hook on its lower end engaging therung on which the lower plank rests and a nut on its upper end resting on top of the upper plank;

In testimony whereof I afiix my signature.

AUGUST LABER.

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