US1211318A - Scaffold. - Google Patents

Description

J. C. KEELER.

Patented Jan.

lNVENTOR WITNESSES ATTORNEY 0.4 Puma-rum WASNINGYON. n. r.

uivrrnn srarns PATENT orr cn. 7

JOHN o. KEELER, or corrolvwoon, 'cnn romvm.

SCAFFOLD.

Applicationfiled April 21, 191a Serial No. 92308.

To all whom it may concern.-

Be it known that I, JoHN C. KEELER, a citizen of the United States, residing at Cottonwood, in the county of Shasta and State of California, have invented certain new and useful Improvements in Scafl'olds, of which the following is .a specification.

This invention relates to scaffolds and more especially to an improved scafiold for use by steeple jacksand the like, where it is desired to provide a scaffold, which is of exceedingly light and portable character.

The invention has for its object the provision of a scaffold of the character described, which may be used for supporting a single person and having means whereby the same may be elevated or lowered at the option of the user.

The invention may be said to contemplate V a cross or supporting bar, which is secured to a block and tackle arrangement, this in turn being attached to some support or other member wherein the device is used.

The annexed drawings and the following description set forth in certain detail construction embodying the invention, such disclosed means constituting, however, but one of the various mechanical forms in which the principle of the invention may be used.

In said annexed drawings :-Figure 1 is a side elevation showing my device as applied; Fig. 2 is a detail in side elevation of the upper pulley and Fig. 3 is a vertical section taken on the line 33 of Fig. 1.

Referring now more specifically to the drawings wherein like reference numerals,

designate like or corresponding parts throughout the several views, it may be said that the supporting member to which the scaffold is attached is designated by the numeral 1. A chain 2 is looped or otherwise secured upon the support 1 and is adapted to receive the engaging and supporting hook 3, which is in turn secured to the double pulley 4 by means of the eyelet 5. A bracing and supporting element comprising a substantially U-shaped member 6, is secured to the sides of the said pulley, by means of rivets 7, or the like, which are passed through suitable openings in the distended portions of the supporting member 6 and through the pulley frame structure 8. It may be stated, that the double pulley 4 rotatably supports sheave wheels 9 and 10, as at 11.

Specification of Letters Patent.

Formed upon the under face of the sup Patented-Jan. 2, 1917.

porting element 6, is an eye portion 12,

which has arranged therein, a ring '13, which ring is adapted to be connected at one end of the scaffold supporting chain 14 as at 15. This scaffold supporting chain extends downwardly and engages a second double sheaved pulley 16, which pulley is constructed in exact accordance with the pulley 4 as hereinbeforedescribed, with the exceptionthat the connecting eye 5 is, in this instance, omitted. Hence, it is deemed;that a 11111111176 description of the construction thereof is unnecessary. The supporting chain is arranged about a sheave or pulley 17 as arranged in the block or frame and then extends upwardly and over the sheave 10 as arranged in the upper block, whereupon, the same is brought again downwardlyand engages the remaining sheaves 18 as carried in the lower block, thence up- Wardly again into engagement with the sheaves 9 in the upper block 4, the ends of the same then extending down so as to be reached by the operator, should it be that he desires to elevate or lower the scaffold,

which structure shall be hereinafter more fully described. Arranged in the eye 12 of the lower beveled sheave pulley or block 16,

is an eye hook 19, that has loosely secured thereto, a hook 20, this hook 20 being gageable withthe various links of the scaffold supporting chain 14, whereby the operator may look the scaffold in its adjusted position. The hook 19 supports the scaffold 21, which comprises a single bar having arranged thereupon, intermediate its ends, preferably at the middle thereof, a collar 22, having arranged thereupon an eyelet 23, which eye receivesa connecting ring 24, the connecting ring in turn being received and supported by a hook eye 19.

Arranged upon the scaffold bar 21 and preferably adj acent' the ends thereof, are collars 24 and 25 provided with eye portions whereby hooks 26 and 27 may be connected thereto. Various implements and receptacles may be supported by these hooks 26 and 27, such as may be needed by the operator in his work. Pads 28 and 29 formed from some resilient material are arranged about the bar 21, thus, ofl'ering cushioning means for the legs of the operator, when seated upon the scaffold.

Tov provide for means whereby the feet of the operator may be supported and to en'- enable him to maintain his balance upon the scafi'old bar21,-.I propose :to provide a foot rest in form of abar 30 having enlarged head portions 31' and 31, this, bar being supported by the scaffold bar 21 through the medium of flexible connections 32and.

32, which are'looped or knotted'over the bars 21 and 30, as at 33. r In reviewing the operation of the device,

.it will be readily apparent that the-supporta ing chain 2 or other suitable means whereby the scaffolding may be attached are engaged by the hook?) as arranged upon the upperblock or pulley fl." The operator, being seated upon the scaffold bar 21 and the pads 28 and 29, can adjust the scafiold by means "of the supporting chains 14, securing the same at the desired position by means of the locking hook 20, whereupon he may enter into the particular work to be done, that matter as necessary for the task being received and supported by the hooks 26 and 27 It will be noted, that the operator or workman when using the scafi'old may raise his body to various positions, inasmuch, as his feet are resting upon the footrest 30.

When the body is raised, the supporting bar Copies of this patentimay be obtained for ,21 will serve as a stayingor bracingmeans,

that is,,the knees or adjacent portions of the le sof the operatormay be engaged therewlthand'the body properly balanced. By

this arrangement, continuous adjusting of r the scaflold 1s overcome.

7 Other modes of applying the principle of my invention may beemployed instead of the one explained, change being made as regards the mechanism herein disclosed provided the. means stated by the following claim, or the equivalent of such stated means, be employed.

I, therefore, particularly point out and distinctly claim as my invention An adjustable scaffold, including, in combination with raising'mea-ns, a supporting bar connected at its middle to said means,

and a footrest loosely suspended from said five cents each, by addressing the ,Gommissioner of Patents, Washingt0n,'D 0.? 1 r

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