US1038579A - Scaffold-supporting mechanism. - Google Patents

Description

B. H. HENDERSON.

SCAFFOLD SUPPORTING MECHANISM.

APPLICATION FILED NOV. '7, 1910. Q ggg wg Patented Sept. 17,1912.

TS- HEET 1, 4 2 SHEE S 6 I Invmr .v E1165 Hi Hendersun EHW I Anmeg 5 E. H. HENDERSON. SCAFPOLD SUPPORTING MECHANISM,

APPLICATION FILED NOV 7, 1910.

2 SHEETSFSHEET 2.

WJiTffEssar-s lnvenlur Patented Sept. 17, 1912.

yim j L lias H-Hanclersnn for scaffolds Chicago,

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ELIAS H. HENDEBSGN, OF CHICAGO, ILLINOIS, ASElIGNOR, BY MESNE A$SIGNMENTS,

- T0 HENDERSON SCAFFOL'D HOIST COMPANY, 0F CHICAGO, ILLINOIS, A. CORFOBA- (MON OF ILLINOIS.

recessive.

TacZZ whom it may concern: Be it known that I, Emits-H. Hnnonason, a citizen of the United-States, residing at in the county of Cook and State of Illinois, have invented certain new and use ful improvements in Scaffold-Supporting Mechanism, of which the following is a full,

' clear, and exact description, reference being bad to the accompanying drawings, forming a part of this specification.

.Myinvention relates particularly to an improved form of supporting mechanism in which the frame construe tion directly supports the hoisting mecha n-isnc employed in commotion with the scafa nature that the frame may be folded to facilitate transportation. In the folded po sition, the frame proper is folded upon a centrally disposed pivot, and the members sup orting the hoisting mechanism are also fol ed against the frame members.

A further object of my invention is to provide hoisting mechanism in connection with a frame construction such that two drums are employed at the same end of the frame for controlling the cables extending upward from the two ends of the frame, as a result of which the end of the frame next to the building and therefore the corrc spondin side of the scafiold are free from obstruction, so that the worlnnen on the scaffold may readily get at all parts of the structure being erected.

The-several drawings illustrating my invention are as follows:

Figure I is an end View of a scaffold equipped with the frame :tnd'hoisting construction characterizing my invention; Fig. 2 is atop view of the frame construction shown in Fig. 1; Fig. is a side view of the frame shown in Fig. l, in its folded position; Fig. 4 is a sectional shown in Fig. 1, taken along the line f d; Fig. 5 is a detail view showing the relation of one of the operating levers to the COI'I'Gf .sponding hoisting drum; Fig. 6 is an end Specification of flatter-s Extent.

Application filed November 7, 1910. Serial No.

being shown, for convenience, drawings. The frame 6 consists of two trons 6 and 6 pivoted together upon a olt view of the parts SGJhFFfiLlF-SUPPGRTING MECHANISM.

Patented Sept. 1?, 31912.

may be employed instead of the mechanism indicated in Fig. 5; and Fig. 9 shows in elevation the parts shown in Fig. 8.

Similar numerals refer to similar parts throughout the several views.

As shown in Fig. 1, the building 1 is provided near its top, or at a sufiicient distance from the ground to operate the scaffold, with an outrigger 2, fron1 which the cables 3 and 4 extend downward to the scaifold 5. The scaffold 5 is supported by a plurality of frames 6,-which are spaced at suitable inter vals, each being supported by cables 3, 4 from an outrigger 2, but one of such frames in the present 7 extending through them.

tion to support the scaffold 5, 6 and 6 are secured substantially in alinement by means of bolts 8 extending through the two sections of the frame. Each section of the frame consists of two members or bars, in order to give stability to the structure and afford a convenient support for the ,en in posihoisting drums 9 and 10. The drum' 9 is supported upon a rod or bolt lllcxtending through the right-hand end of the section 6* of the frame, and this rod or bolt also the members pivotally supports the two members 12 of i the frame employed to support the drum 1O upon the rod or bolt 13 extending through such members 12. The drum, 10 receives the lower end of the cable 4, whichis guided by a'sheave 1i loosely mounted upon r rod or bolt 15 extending between the er ends of the bars 12. The drum 9 I'(..lVGS illi lower end of the cable 3, which is guided.

below the scaffold 5 by means of a sheave 16 mounted upon a pin 17 between the lefthand ends of the bars comprising the sec-- tion 6 of the frame. The bars forming the section 6 of the frame are bentas indicated, so that the bent portions will engage tie surface of the structure being erected if fir any reason the scaffold is moved againstit and thus the cables 3 and sheaves 16 are prevented from coming in contact therewith. A bolt 18 extends between the members of the section 6 of V the frame at the bends formed in such members and outside of the cable 3, thus preventing displacement of the cable 3fro1n between such members In; case of accident which would drop the scaffold if such displacement were not prevented. A pipe separator .19 is placed upon the bolt 18 between the members of the section to properly space them.

Each of the drums 9 and 10 is provided at one end with a comparatively thick flange 9, 10, which is recessed and provided with an internal ratchet, as shown at 9 adapted o be engaged by an operating lever 20 mounted upon the support of the drum and provided with a slot 21, so that it may be moved longitudinally upon such support to engage and disengage the teeth of the internal ratchet. A projection is formed on the extreme lower end of the lever 20, ex tending into the recess, such projection be ing pointed to properly engage the teeth of the internal ratchet. A pipe 22 may be slipped over the' end of the lever 20 to increase the purchase, if desired, and, as clearly indicated in the drawings, operation of the lever 20 by means of the pipe 22 serves to rotate the drum 9, and thus to wind up the cable 3, suitable pawls 23 and .Zelbcing provided to engage external ratchet teeth formed on the heads of the drum. As indicated in Figs. 2 and 1, the end of the drum opposite to the operating end is provided with a comparatively thin flange or head of just sufficient thickness to properly retain the hoisting cable and to engage the retaining pawl. The pawls 25 and 26 used in connection with the upper drum 10 are made with hooks at their upper ends, as indicated in Fig. 1, and are supported upon the same supporting rod 27 as are the pawls 23 and 2d. The pawls 23 and 25 are provided with -a common flat spring 28, the ends of which are secured to the pawls by suitable means, as set screws, while the pawls 24 and 26 are provided with a"similar spring 29.

When the scaffold is lowered upon the completion of the work and itis desired to' pack the same for shipment, releasing the tension upon the cable 4 permits the bars 12 to be swung about the rod or bolt 11 so that the bars 12 may assume the position indicated in Fig. 3, and the bolts 8 are removed and the section 6 of the frame is folded under the section 6* until it assumes the position indicated in Fig. 3, for which position the frame and hoisting mechanism occupy a minimum amopnt of space-and in v be shipped much more effectively than if it were not thus folded As shown in Figs. 6 and 7, the modified form of supporting construction employed in connection with a painters scaffold 30 consists of a supporting frame 31 eonsisting of two similar bent bars having hooks formed on their lower ends to engage one side member of the scaffold 30, while pivchad thereto upon the rod or bolt 32 extend ingbetween the bars 31 are bent bars 33 having hooks formed on their lower ends to engage theother side member of the scaffold 30. The bar 32 supports a hoisting drum 34 between the bars 31, which hoisting drum is provided with an'"operating lever 35 and holding 'pawls 36 similar to those shown and described in connection with Figs. 1 to 5, inclusive. rod or bolt 37 extehds between the upper ends of the bars 31, and upon this rod or bolt there is mounted a sheave 38 around which the cable 39 wound upon the drum 34 extends to a suitable support secured to the building or structure upon which work is being done. One of the hoisting mechanisms shown in Figs. 6 and 7 is employed at each end=of the scaffold 30. As the bars 33 are pivoted to the bars 31 at 32, it will appear that the may be readily moved to accommodate di ferent widths of scafiold, and also that they may be folded together when not in use to occupy a minimum space.

In the modification shown in Figs. 8 and 9. the lever 20 and internal ratchet 9 are replaced by means of a gear 40 out upon the thicker head of the drum and engaged by a worm 4:1 supported'from the bar 42 by means of a bent bracket 13, as indicated.

The axis of the worm 41 is sufliciently inclined to the plane of the gear so that the threads of the worm are substantially parallel with the teeth of the gear at the points of engagement, and by thisconst-ruction a positive locking action is secured between the drum and worm which is more effective to prevent back rotation of the drum than if the teeth formed on the periphery of the head of the 'drum were inclined to correspond withthe threads of the worm, thus constituting the wheel 40 a regular Worm wheel. A" further advantage of the construction indicated is that the gear wheel 4.0 is much easier to construct than is a worm wheel adapted for use with the Worm 41. The worm 41 is operated by means of a shaft 44:, to which it is rigidly secured,

which shaft is operated by means of a crank 45, as indicated.

While I have shown my invention in the particular embodiments'herein described, I do not, however, limit myself to these constructions, but desire to claim any equivalent that may suggest itself to those skilled in the art.

What I claim is:

1. In a scaffold support, the combination of a horizontal frame, a vertical frame at one end of the horizontal frame, a rod extending through the two frames to pivot them together, and a. hoisting drum mounted upon the rod.

2. In a scaffold support, the combination of a horizontal frame, a vertical. frame at one end of the horizontal frame, a rod extending through the two frames to piy ot end of the horizontalirame, a rod passing through the two frames to pivot them together, a, devlce mountedv upon sald rod for recervmg a cable, and a holstmg drum r0- tatabiy mounted in the vertical frame to 19 which a cable is secured.

In witness whereof, I hereunto subscribe my name this 5th day of November, A. D

ELIAS H. HENDERSON. Witnesses ALBERT Q. BELL, ALBERT MsCALEBu

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