US2400659A - Scaffold ladder - Google Patents

Description

Patented May 21, 1946 SCAFFOLD LADDER Yvon Sis-Mars, Verdun, Quebec, Canada Application November 2.5, 1944, In Canada May 29,

1 Claim.

The present invention pertains to a novel ladder designed particularly for use in erecting a scaiold. The principal object of the invention is to provide a ladder of such construction that a scaffold may be formed by passing a plank through a pair of identical ladders, without use of fastening means. The scaiTold so constructed is so easily assembled and disasembled that it can readily be moved from place to place in a small room much more easily than the furniture could be moved. Other advantages of the scaffold are set forth in the detailed description.

In the accomplishment of the stated object of the invention each of the ladders includes a pair of stiles with steps secured therebetween in any suitable manner. At a slight distance above each step is mounted a strong bar, preferably in opposed notches in the Stiles. The spacing of each bar above the next lower step is such as to permit insertion of a plank between the bar and the step and to cause the plank to be tightbetween the bar and the step when the ladder is swung outward to a relatively small angle. f nus, when the ladders are diverged downwardly to form a sufcient space, they are tightened against both surfaces of the inserted plank without the use of additional fastening means.

This construction is superior to a step-ladder inasmuch as the plank has suflicient area to support the painters supplies for a considerable length of time, thus enabling him to work without interruption and without the need of an assistant to hand him his materials.

The invention also includes a novel extension for the lower end of each stile and designed particularly for a sloping ladder.

The invention is fully disclosed by way of example in the following description and in the accompanying drawing in which:

Figure 1 is a perspective view of a scaiTold constructed according to the invention;

Figure 2 is a detail vertical section of one of the ladders;

Figure 3 is a corresponding front elevation, and

Figure 4 is a detail perspective view showing an extension leg attached to the lower end of one of the ladders.

Reference to these views will now be made by use of like characters that are employed through- Serial No. 565,084

out to designate corresponding parts through- Y out.

In Figure l are shown two ladders, and inas- `much as both are identical, it will be necessary to describe only one of them. Each ladder includes a pair of stiles I between which are fastened Yrungs or steps 2 in any desired manner. A metal rod 3 may be mounted against the lower surface of each step 2, with its ends fastened in the Stiles, for reinforcing the steps.

Slightly above each step, each of the Stiles is formed with a rectangular notch 4 in the inner edge. In each pair of opposed notches is set a bar 5, extending from stile to stile, and fastened to both stiles by any suitable means, such as nails Each bar is preferably mounted with its width standing vertically in order to provide greater strength for the purpose that will presently be described. The spacing of each bar above the corresponding step is such as to receive a plank or board 'I with such looseness as to permit only a slight angular tilting of the ladder, as shown in Figure 1.

Figure 1, moreover, illustrates the manner of forming a scaifold by means of two such ladders and one plank without the use of special fastening means.' The plank is passed between corresponding steps 2 and adjacent bars 5 of two similar ladders, and the latter are swung outwardly at the bottom, or divergently, to the extent permitted by the spacing between the respective steps and bars, as previously described. The plank l thus becomes tightened between the steps and bars, and this tightness is further increased when the plank supports the weight of the worker. The plank can obviously be ad-v justed to various heights as desired.

The lower end of each stile I is formed with a longitudinal-series of openings 8. An eXtension 9 is attached to the lower end of each stile by a pair of bolts I0 passed through two openings 8 and through two coinciding openings in the extension and 'tightened by wing nuts Il. The extension carries a .pair of L-shaped brackets l2 overlapping the stiles on the outer edges and thus serving as braces to prevent inward swinging of the extensions.

By means of a scaffold erected as described, a small room may be painted without requiring the removal of the furniture as necessitated by the use of a step ladder. This result is accomplished by mounting the scaffold in a manner that the ladders may straddle each piece of furniture in turn, that is, the piece of furniture stands between the ladders. Also, by means of this device, a room can be painted by one man only and he is not required-to run up and down the ladder frequently, -since he may place all Yquire an assistant to hand l Y, the plank 'l while retaining tails of construction may be used for hanging clothes` panting from the scope of the invention as indicated by the appended claim.

What I claim as my invention is: A scaffold comprising a pair of ladder comprising'a pair of stiles,

ladders, each steps between said Stiles, each stile being notched in one edge; slightly above each step, abar secured in each pair of opposed notches, each bar having a Y than thickness and mounted with,

greater width its width standing vertical inthe erected ladder,

and a plank inserted between corresponding steps and bars of said ladders, said ladders diverging downwardly to tighten said plank be- Y tween said steps and bars.

YVON ST-MARS.

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