US510057A

US510057A - Ladder-scaffold

Info

Publication number: US510057A
Authority: US
Publication date: 1893-12-05
Anticipated expiration: 1910-12-05

Description

(No Model.)

f g i w i 2 Sheets-Sheet 1.

T. 0. WILLIAMS.

LADDER SQAFFOLD.

Patented Dec. 5,1893.

Wilgcsscs ms NAncuAl. LITHOGRAPHING coma v.

WASHINGTON. w. c. I

UNiTE STATES PATENT OFFICE.

' THOMAS o. wILLIAMs, F RANDOLPH, WISCONSIN.

LADDER-SCAFFOLD.

SPECIFICATION forming part of Letters Patent No. 510,057, dated December 5, 1893.

Application filed June 28,1893. Serial No. 479.088- (No model.)

To 00 whom, it may concern:

Be it known that I, THOMAS C. WILLIAMS, a citizen of the United States, residing at Randolph, in the county of Dodge and State of Wisconsin, have invented a new and useful Ladder-Scaffold, of which the following is a specification.

The invention relates to improvements in scaffolds.

The object of the present invention is to provide a ladder soalfold for carpentering, painting, decorating, and analogous uses, capable of being readily erected and quickly moved from one position to another, and adapted to support at any desired elevation within its compass platforms, either of which may serve as a bench.

The invention consists in the construction and novel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings and pointed out in the claims hereto appended.

In-the drawings-Figure-l is a perspective view of a scaffold constructed in accordance with this invention. Fig. 2 is a transverse sectional view. Fig.3 is a detail sectional view of the lower portion of one of the ladders.

Like numerals of'reference indicate corresponding parts in all the figures of the drawings.

1-1 designate vertical ladders forming the posts or uprights for a scafiold, and each consisting of spaced bars 2, and a series of long and short stationary rigidly secured bracket bars 3 and 4 forming intervening spaces 5 adapted to receive removable adjustable bracket bars 6, adapted to be inserted in any of the spaces 5 for supporting platforms 7, and 8. The bars 2 of each ladder are recessed at their inner opposed faces to receive the stationary bracket bars 3 and 4, which are centrally enlarged, the extensions and 11 being at theirlower edges. Thelowerends of the bars 2 are spaced by a block or strip 12 of hard wood or other suitable material, which is extended to form a spur 13 to prevent the ladder from slipping.

The platform 7 is trussed and consists of upper and lower boards, secured together at their ends and spaced by truss blocks or struts 14 and 15. The adjustable platform consists of two boards, slidingly mounted on each other and provided each at its inner end with a rectangular sleeve 16 receiving the other board and permitting the boards to slide on each other to extend or shorten the platform, which will greatly increase the reach of a painter, and which is especially adapted for such, and similar light work. The platforms may be arranged at any desired elevation on the ladders; either one may be employed as a bench, one being arranged above the other; or they may be located at the same elevation to form a platform of increased width if desired.

The scaffold is supported at each ladder by

adjustable braces

17 and 18 disposed transversely and longitudinally of the scaitold and having their upper ends hinged to the ladders at the tops thereof. Each brace consists of bars or

sections

19 and 20 provided at their inner ends with

rectangular sleeves

21 and 22. The

sleeves

21 and 22 have securing plates formed integral with them; and the upper bar 19 and its sleeve 22 are provided with a perforation to receive a locking pin 23; and the lower bar 20 is provided at intervals with perforations to secure the brace at any desired adjustment. The upper end of the transverse brace is secured at the uppermost bracket-bar by a pivot bolt; and the longitudinal brace is connected with the ladder at a pointjust below the outer portions of the second bracket-bar from the top by means of a pivot bolt 19 and angular leaf-plates 24. The pivot bolt of the leaf plates passes through the extension of the adjacent bracket-bar; and the leaf plates are offset at their angles to fit the bars of the ladder and the upper bar or section of the brace, which are not of the same width. The locking pins may be connected withthe braces, by astrap, chain, cord or the like, to prevent them from being lost.

The ladders can be employed singly with advantage; but when two of them are used to form a scafiold, the lower end of the longitudinal brace of each may, as illustrated in the accompanying drawings, be secured to the base or lower end of the o her ladder, by a bolt 25 to obviate the necessity of stapling the longitudinal braces. The longitudinal braces may extend outward beyond the ladders to leave the space between the latter free from braces, and this is especially desirable in carpentry. The lower end of each brace has hinged to it by a metal strap a ring or loop 26 adapted to receive a stake, pin or nail for anchoring the scaffold.

The paints and other material employed may be drawn up to the platform by a rope; and by employing three ladders a scaffold may be readily erected around the angle of a building. The extension platform increases the reach of the workmen; and by constructing the platform of the adjustable board, it is also strengthened at the center a point where increased strength is most needed. This form of platform will be found to be of great advantage in interior work. Two men, one at each end can readily carry the scaffold without separating it, by simply withdrawing the stakes.

It will be seen that the scaffold is simple and comparatively inexpensive in construction, that it may be readily erected on the inside or outside of a building, that its parts may be readily separated and compactly stored, and that it maybe easily moved without separating the parts by simply loosening the stakes.

Changes in the form, proportion and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of this invention.

What I claim is- 1. In a scaffold,the combination of ladders, each composed of the spaced vertical bars, and the rigid horizontally disposed stationary bracket bars secured between the spaced bars and projecting outward from opposite sides thereof to provide a ladder and forming intervening spaces, removable bracket bars fitting in the spaces between the stationary bars and extending outward horizontally, and a platform supported by the removable bracket bars, substantially as described.

2. In a scaffold, the combination of ladders, each composed of spaced bars and rigid bracket bars secured between the spaced bars and forming intervening spaces, removable bracket bars adapted to be inserted in the said spaces, a platform adapted to be sup ported by the bracket bars, and adjustable transverse and longitudinal braces connected to the upper ends of the ladders, substantially as described.

3. In a scaifold, the combination of ladders provided with bracket bars, a platform supported by the bracket bars, adjustable transverse braces pivoted to the upper ends of the ladders, and adjustable longitudinal braces each having its upper end hinged to the top of one of the ladders and its lower end detachably secured to the bottom of the other ladder, substantially as described.

t. In a scaffold, the combination of ladders provided with bracket bars, a platform supported by the bracket bars, adjustable transverse braces pivoted to the upper ends of the ladders, adjustable longitudinal braces, each extending from the top of one of the ladders to the bottom of the other ladder and detachably secured at the latter point, and the angle leaf-plates offset at their angles, secured to the upper ends of the longitudinal braces and hinged to the ladders, substantially as described.

5. In a scaffold, the combination of a vertical ladder composed of spaced bars and bracket bars secured between the spaced bars and projecting from opposite sides thereof, and adjustable braces hinged to the top of the ladder, substantially as described.

6. In a scaffold, the ladders composed of the spaced

vertical bars

1 and 2, and the horizontally disposed stationary bars 4.- clamped between the vertical bars and projecting therefrom to form a ladder, and providing intervening spaces 5 to receive adjustable bracket bars, substantially as described.

7. In a scaffold, the combination of ladders, a platform supported by the ladders, and adj ustable longitudinal braces each having its upper end hinged to the top of one of the ladders and its lower end detachably secured to the bottom of the other ladder, and crossing each other at an intermediate point, substantially as described.

8. In a scaffold, the combination of ladders, a platform supported by the ladders, adj ustable longitudinal braces, each extending from the top of one of the ladders to the bottom of the other ladder and detachably secured at the latter point and crossing each other at an intermediate point, and the angle leaf-plates oifset at their angles, secured to the upper ends of the longitudinal braces and hinged to the ladders, substantially as described.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

THOS. O. WVILLIAMS.

Vitnesses:

ROGER WILLIAMS, G. C. FOSTER.

ICC