US1494489A - Adjustable scaffold - Google Patents

Description

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UNITED STATES.

, means PATENT OFFICE. I

EDMOND JONES, OF CLEVELAND, OHIO, ASSIGNOR OF ONE-HALF TO ALFRED ALLEN, OF

CLEVELAND, O'HIO.

ADJUSTABLE soArFoLn.

Application filed January 18, 1923. Serial No. 613,439.

T all whom it may concern:

Be it known that I, EDMOND JoNEs, a citizen of the United States, and residentof Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in .Adjustable scaffolds, of which I hereby declare the following to be a full, clear, andexact description, such as will enable others skilled in the art to which it appertains to make and use the same. i

The objects of the invention are to provide an improved form of vertically adjustable bracket or scaffold for the use of can penters, painters, bricklayer-s and other artisans, and it comprises a standard having a ladder at one or both ends and also provided with vertical guides in which brackets supporting aplatform upon whichthe 'u artisan stands are, vertically movable, and

also includes mechanismby means of which the artisan can raise or lower the platform without leaving the same.

It also includes folding supports for the scaffold, permitting it to be folded in small compass for storage and transportation.

The invention is hereinaftermore fully described, illustrated in the accompanying drawings and specifically pointed out in the claims.

In the accompanying drawing, Fig. 1 is a perspective of the complete device.

Fig. 2 is a side elevation of the same and Fig. 3 is afront elevation thereof. Fig. 4: is a detail of the brake mechanism.

Figure 5 is a detail view of one of the spacing and locking blocks which are utilized at the bottom of the scaffold support. Referring to the drawings which illustrate one of many possible embodiments of the innate a pair of ladders which are adapted to be supported in an upright position, said ladders having a spaced relation and being arranged in substantially the same vertical plane when they are in use. Arranged at the base of the ladders and extending across the support at the front and rear respectively of the ladders are the horizontal base members or bars 1l. Extending rearwardly from the ends of the base members 11 are horizontal supporting strips 2-2 which have the rear ends thereof connected to the top portions of the respective ladders by the diagonal braces 3-3. Similar transverse strips or feet 4- 1 are hingedly connected at 5 to one of the base members 1, sothat they can either be swung outwardly into operativeposition, as indicated by Figure 1, or folded against the base member.

Arranged in a spaced and parallel relation to the inner side of each of the ladders A is a vertical guide member or strip 6.

These guide strips 6' are provided with racks 7 and are separated from the upper ends of the ladders by spacing blocks 8 and from the lower ends of the ladders by the spacing blocks 9. One of the spacing blocks 9 is shown in detail by Figure 5, and it will be observed that the end portions of the spacing block are. adapted to overhang the base members 1 and are'notched at 10 to interlock therewith. The middle portion of the spacing block is formed with an opening 11 and these openings receive the bolts 12 which are utilized for-securing the transverse base strips and vertical guide strips to the lower ends'of the ladders. Similar bolts 13 are utilized at the top of the ladders for attachingthe diagonal bracesand blocks thereto. The upper ends of the ladders are connected by transverse top bar 14, said bar having blocks 15 secured thereto and these blocks icing engaged by the bolts 13.

The platform 16 of the scaflold is mounted upon and carried by a pair of brackets 17 which are mounted to slide up and down upon the ladders and vertical guide strips ti. I

The brackets extend through the spaces provided between the ladders and the respective guide strips 6 and are provided with the front and rear guide bars 18 which slidably engage the vertical guide strips 5 and adjacent sides of the respective ladders at the front and rear thereof, so that the brackets are held against tilting. The rear guide bars 18 may extend upwardly above the leys 26 which are arranged at. the upper portion of the support, being shown in the present instance as mounted upon the-spam mg blocks 8. After passlng around theand ratchet mechanism 23 is rendered inoperative by disengaging the pawl from'the ratchet and the lowering of the platform can be controlled by grasping the crank shaft 21 and controllingthe speed of rota-' tion of the windlass drum.

The platform is provided with an automatically acting brake device to prevent accidental falling thereof.

This brake device includes the sliding bolt rods 27 which extend loosely through the guides 28 and terminate at their outer ends in noses adapted to engage the teeth of the racks 7. The inner ends of the locking bolts 27 terminate in curved end portions 29 which cross each other, asindicated quite clearly by Figure 4. The crossed ends are connected by a tension spring 30 which normally tends to slide the'bolt rods outwardly and hold the outer ends-thereof in operative engagement with the racks 7. The crossed inner ends of the guide rods are also connected by thetoggle levers 31 which provide a means for moving the locking bolts into inoperative positi on. hen lowering the platform the operator must place one of his feet upon the toggle levers 31 and push the toggle levers downwardly to expand the same and retract the locking bolts 27 into inoperative position. When the locking bolts are thus released and held in inoperative position the platform can be lowered, although at other times the locking bolts will cooperate with the racks to render an accidentaldropping of the platform impossible.

Having described the invention what I claim as new and desire to secure by Letters Patent is: p

1." In an adjustable scaffold, the combination with a pair of spaced upright ladders, of guide bars spaced from the sides of the respective ladders, brackets slidable between the ladders and'the guide bars, a platform carried by the brackets and means for raising and loweringthe brackets.

1 2. An adjustable scaffold, including spaced upright ladders, guide bars spaced from the respective ladders, brackets slidable between the guidebars and the ladders, upright guide strips applied to the brackets and slidably engaging opposite sides of the ladders to prevent tilting of the brackets, a

platform engaging the guide bars to hold the brackets and platform in anadjusted position.

An adjustable scaffold including upright guide members, a platform, means for slidably mounting the platform on the guide members, means forraising the platform, locking bolts mounted upon the platform and adapted to engage the guide members to hold the platform in position, the inner ends of thelocking bolts overlapping each other. yielding means normally tending to move the locking bolts into operative position, and toggle levers connecting the overlapping inner ends of the locking bolts for moving the locking boltsagainst the action of the yielding means to release the same.

5. I11 a device for the purpose described, vertical ladders spaced apart, guide means on the adjacent sides of said ladders, brackets, slidable in said guides, a platform secured tosaid brackets, front and rear parallel members between which said ladders are inserted, backing blocks therefor, a top member connecting the tops of said ladders, horizontal base members extending towards the front and rear from said ladders, one of said base members being foldable, and

brace members connecting said rearwardly extending base members with the upper ends of said ladders.

'In testimony whereof, I hereunto set my hand this 16th day of December, 1922.

Wan M. MONROE, ALFRED ALLEN.

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