US1141749A - Pendant-scaffold support. - Google Patents

Description

w. H. ALLEY. PENDANT SCAFFOLD SUPPORT. APPLICATION FILED '026124, 1914.

Patented June 1, 1915.

. nr; Pfmr: L'THD.. WASHINGIUN. D. C.

' cross bar.

WHITFIELD H. ALLEY, O CHICAGO, ILLINOIS.

rENDAnT-scArroLn SUPPORT.

Speccation of Letters Patent.

Patented J une 1, 1915.

Application filed December 24, 1914.. Serial No. 878,961,

To all whom t may concern:

Be it known that I, WHITFIELD H. ALLEY, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Pendant-Scaifold Supports, of which the following isa specification.

rIhis invention relates toA improvements in supports for scaffolds of that type which are suspended from the roofs or cornices of `buildings and are commonly used by painters in painting the walls of such buildings. Pendant scaffolds of this type commonly comprise a pair of side frame members hung from depending cables and pulleys, a pair of cross bars mounted in stirr'ups on the lower ends of said side frame members, and abutting at their forward ends against the wall, and a platform proper that lies across and is supported by said Municipal regulations in some localities also require a safety bar or rail that is sometimes mounted upon the side frame members and sometimes mounted independently of the side frames and serves as a guard to prevent the workmen from falling backwardly off the scaffold;

One object of my-invention is to provide an improved pendant scaffold support that shall be readily adapted to use with scaffolds of varying widths.

Another object is to provide an improved pendant scaffold support that will prevent any creeping of the cross bar relatively to its supporting stirrups ofthe side frames.

A further object of the invention is to Y provide an improved pendant scaffold support wherein the safety bar or rail shall be so disposed as to permit more freedom of action of the workmen on the scaffold without lessening its safety feature.

Still another object of the invention is to provide an improved pendant scaffold support characterized by increased simplicity and economy of structure and a high degree of eiciency for its intended service.

The device of my invention, its construction, mode of use, and attendant advantages will all be readily apprehended when considered in connection withthe accompanying drawing wherein I have illustrated a simple and preferred embodiment of the 1nvention, and in which- Figure l is a side elevational view of my improved scaffold support, showing the platform in end elevation and indicating the lower end of the suspending means. Fig. 2v is a perspective elevation of the complete side frame structure, the position of the cross bar engaged thereby being indi-V cated in dotted lines. v

Referring to the drawings, 5, 6 and 7 represent three limbs of a triangular frame member that is preferably formed from a single length `of rod or bar metal and is equipped at its lower corner with a cross bar stirrup 8, at its upper corner with a safety bar loop'9, and at its intermediate corner with an eye 10 adapted to engage a suspending device, such as the hook 11 of a pulley block 12, the suspending cable being indicated at 13. As herein shown one end portion of the rod or bar is bent to the substantially rectangular shape of the stirrup 8, the eXtreme end of the piece being bent or twisted around .the lower end of the frame member 5 as indicated at 14. The suspending eye 10 is formed from the meeting portions of the limbs 5 and 6, said limbs being twisted together, as shown at 15, at the base of the eye 10; and the safety bar loop 9 is formed from the meeting portions of the limbs 6 and 7, said limbs being twisted together, as shown at 16, at the base of the loop 9. The other end of the piece, at the lower end of the limb 7 is twisted or curled around the lower portion of the limb 5 as shown at 17. In thisway a strong and rigid frame piece is constructed from a single length of rod or bar metal without requiring the use of rivets or welding.

18 designates a depending leg member that is formed at its lower end with a cross bar stirrup 19 corresponding to the cross bar stirrup 8, the eXtreme end of the wire being curled or twisted around the lower end of the leg 18, as shown at 20. On the upper end of the leg 18 is an eye 21 formed by carrying the upper portion of the rod through the eye 10 of the triangular frame piece and curling or twisting its eXtreme end 22 around the leg 18. By reason of this construction the suspension leg 18 of the side frame member is readily adjustable toward and from the limb 5 of the triangular frame piece, which limb 5 constitutes the other suspension leg of the complete structure.

A safety bar or rail 23 is mounted in and supported by the loops 9 of the two side frame structures, and a cross-bar 24 is simiwhere a cross bar is supported in the stirrups4 of a pair of suspension legs or hangers, there is more or less tendency of the stirrups to creep forwardly or toward the wall of the building upon, the cross bars. To prevent this I providey a suitable stop device which may consist simply of a bolt 28 extended through the cross bar 24 just in advance of the stirrup V19. Y

The flexible connection of the leg member 18 to the eye 10 at the upper end of the Vleg member 5 enables said leg members to be adjusted toward or from each other so as to accommodate platforms of considerably varying widths; and to make the stop 28 universal in its application I preferably provide the cross bar 24 with a `series of imifornily spaced holes, indicated by dotted lines at 29, to receive the stop bolt 28'. It will further be observed that the parts are so formed and assembled that the safety rail 23 is oEset considerably in rear of a vertical line passingV through the stirrup 8. By thus setting the safety rail somewhat in rear kof the vertical plane of the stirrup 8,

'the device provides more room and greater freedom, especiallv in bending movements for the operator, than in constructions such as those heretofore used wherein the safety Vrail is substantially vertical above the rear stirrup and unduly crowds the worker against the wall of the building and hinders his freedom of movement. 1

The simplicity of the structure, and th avoidance of rivets and welding obviously contribute largely to the economical and low cost of manufacture; and theflexibility of Vthe device, by which it is enabled to be used with either a narrow or wide platform,

enablesV a painter to get alongwith a muchV lless number of Vplatform supporting devices than has heretofore been required to meet Copies of this patent may be obtainedpfor the demands of jobs requiring platforms of different widths. Y

It will be manifest to those skilled in this art that minor structural details lof the device as shown and described might be varied more or less without involving any departure from the principle or sacrificing any of the advantages secured by the invention. Hence, l regard such detail modifications as within the purview of the invention as defined by the appended claims.

I claim:

1. In a pendant scaold support', the com-` bination of a triangular frame member hav-V ing at one corner a cross-bar stirrup, at another corner a safety-rail loop, and at its third corner an eye toengage a suspending device, anda depending leg member flexibly connected at its upper Aend tothe eye of said framermember and having a cross-bar stirrup at its lower ends 2'. A pendant scaffold support comprising,

in combination, side frames each having angularly adjustable suspension legs flexibly connected to each other at theirV upper ends Y and formed with cross-bar stirrups at theirV lowerl ends, cross-bars carriedby said' stiriups and each-formed with a series 0f spaced holes therein, and stop-bolts engaging said holes and coperating with said sti-rrups to prevent a creeping movement of the latte relatively to said cross-bars.

3. A pendant scaffold vsupport comprising, `in combination, side frameseachcomat its three corners with a cross-bar stirrup, a

85,V )rising a triangular frame member. formed v safety-rail lcop, andv a suspensionleye, respec- 'f tively, and a depending legnmember lflexibly connected at its upper end to said triangular frame member and formed withV a cross-bar stirrup at its lower end, cross-bars mounted in said `stirrups and each Vformed with a series of spaced holes therein, andv stop-'bolts engaging said yholes and coperating with the cross-bar stirrups of said depending leg members to prevent creeping of thelatter relatively to said crossbars.

Y lWitnesses ':i IRA lJ. VViLsoN, A. G.`-LATIMER.. Y Y

the Commissioner ofdatents,

YVHITIELD H. ALLEY..` y

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