US740398A

US740398A - Scaffold.

Info

Publication number: US740398A
Application number: US13134702A
Authority: US
Inventors: Merrell Autry Cheves
Original assignee: Individual
Current assignee: Individual
Priority date: 1902-11-14
Filing date: 1902-11-14
Publication date: 1903-10-06
Anticipated expiration: 1920-10-06

Description

N0. $40,398. PATENTED OCT. 6, 1903;

M. A. GHBVBS.

SGAFFOLD. I APPLICATION FILED NOV. 14, 1902.

K0 MODEL.

UNITED STATES Patented October 6, 1903.

PATENT @FFICE.

SCAFFOLD.

SPECIFICATION formingpart of Letters Patent N 0. 740,398, dated October 6, 1903.

Application filed November 14, 1902. Serial No. 131,347. (No model.)

To all whom, it may concern:

Be it known that I, MERRELL Aurnv OHEVES, a citizen of the United States, residing at Marshall, in the county of Harrison and State of Texas, have invented certain new and useful Improvements in Soaffolds; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being bad to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

My invention relates to extension-scaffolds, and comprises a platform carried on toggles, which are operated from said platform to raise or lower the same.

The object of my invention is to provide means for extending the scaffold to considerable height when necessary and also for securing two or more scaffolds together.

A further object is to provide a strong and rigid structure having no complicated parts and which may be easily manipulated.

In the drawings, Figure 1 is front elevation of my invention. Fig. 2 is an end elevation of the same. Fig. 3isa front elevation showing the manner of extending the toggles to raise asecondary platform to a greater height.

Referring specifically to the drawings, 6 indicates the base of the scafiold, and comprises the side timbers 6', standing on legs 6. The toggles are arranged in pairs, and comprise the lower toggle-bars 7, pivoted to the side timbers 6 at 7. The uppertoggle-bars 7 are pivoted to the platforms at '7. The bars 7 and 7 are pivotally connected at 7 to knee-blocks 9 and 10. The screw 11 passes through a threaded bore in the blocks. The screw comprises two sections, one for each pair of toggles, and each section has a right thread 11 and a left thread '11" for the re-- by a suitable hand-crank 14. If desired, a a

* To steadythe sc'afiold, I provide putlogs 15,

which set against the house or-other structure. Said putlogs are slidingly mounted in slots 8 in the lodgers 8 of the platform and are adjusted to the desired distance by thumbscrews 8 inihe block 8 secured to the lodgers. Lateral braces 16 extend from the end of the platform to the ground. They are adjustable for different heights by means of a series of holes 1b and pins 16 projecting from the platform. The lower ends of the braces have claws or spikes 16 to enter the ground. Brackets 17, removably secured to the platform 8, are for the purpose of bolding lumber, tools, 860.. c 4 To use the scafiold at a considerable height,

' the modification shown in Fig. 3 is employed.

The upper bars 7 of the toggles are lengthened by lazy-tongs,comprising arms 18,joined to the bars by screw strap-clamps 18 and arms 19, pivoted to the ends of the arms 18.

The extension thus formed carries a suitable.

platform 20 Two or more scaifolds may also be superposed. For this purpose I provide pins 21, secured to the side timbers 6 to enter staples 22 on the lodgers 8 ,the brackets 17 being first removed from the platform 8.

" Itwill be seen that the hoisting device can be operated by a workman on the platform.

Having thus described my invention, what is claimed as new, and desired to be secured by Letters Patent, is- 1. A scaffold comprisingabase, aplatform, hoisting-toggles between the same, removable lazy-tongs secured to said toggles, a platform carried by the lazy-tongs and means to operate the toggles, substantially as shown and described. Y

2. A scaffold comprising a base and a platform, toggle-bars pivoted thereto,knee-blocks therebetween to which the toggle-bars are same to turn the screw, substantially 'as depivoted, a screw extending horizontally scribed. through the knee-blocks, a pulley on .the In testimony whereof I affix my signature screw, standards supported by the screw and in presence of two witnesses.

5 extending above the platform, a second pul- MERRELL AUTRY CHEVES.

ley journaled in the standards above the plat- Witnesses: form, a belt connecting the pulleys, and a M. B. PANCHMAN,

crank on the platform-pulley operating the T. L. WHALEY.