US788992A - Combined ladder and scaffold. - Google Patents

Description

No. 788,992. PATENTED MAY 2, 1905, M. BAUER.

COMBINED LADDER AND SGAPPOLD.

APPLICATION FILED our. 1a, 1903.

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COMBINED LADDER AND SGAPFOLD. APPLICATION FILED 001'. 1a, 1903.

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To It whom/ 7125 riuty concern:

Be it known that I, MARTIN BAUER, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful 1mprovements in a Combined Ladder and Scaffold; and I do declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements on a combined ladder and scaffold for which 1 obtained Letters Patent of the United States December 16, 1902, No. 715,944; and the said improvements consist in certain features and details of construction,substantially as shown, and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a perspective elevation of a portion of a building and my improved ladder and scaffold in working relation thereto. Fig. 2 is a plan view or top view of the ladder, enlarged, as compared with Fig. 1. Fig. 3 is an enlarged side view in elevation of a portion of the ladder, with a portion of the scaffold sectioned away to disclose the manner of locking the same in horizontal position. Fig. 4 is a cross-section of one side of the ladder looking down on a line corresponding to 1 1 Fig. 3; and Fig. 5 is a plan view of the scaffold and a cross-section of the ladder on line m m, Fig. 3. Fig. 6 is a front elevation of a portion of a ladder, showing the scaffold and the bracingwith the ladder and connecting the same, as hereinafter fully described. Fig. 7 is a perspective view from the rear and side of a portion of the ladder, showing one of the locking-dogs for the scaffold or platform; and Fig. 8 is a perspective view of a modification of the dog and a portion of a ladder in which it is engaged.

As thus shown, A represents what may be regarded as an ordinary ladder, having rounds a, as usual, by which to ascend and descend and serving the usual purposes in all respects; but in addition to this I have equipped the ladder with means which provide a scaffold or frame and the means for engaging said parts i l I l Patented May 2, 1905.

Uwiritn STATES PATENT Orricis.

MARTIN BAUER, OF CLEVELAND, OHIO, ASSIGNOR OF ONE-HALF TO FRIEDERICH J. LANCER, OF CLEVELAND, OHIO.

COMBINED LADDER AND SCAFFOLD.

'SFECIFICATION forming part of Letters Patent No. 788,992, dated May 2, 1905. Application filed October 19, 1903. Serial lTe. 177,579.

brace or rest is of such length or depth as will support the ladder apart from the building sufficiently to make room for the scaffold C. The idea of a brace or rest for the ladder is not broadly new in this case, the invention being embodied in a form in my Letters Patent above mentioned; but in the said patent the brace or rest B has no range either above or below the comparatively short limitations within which it is adjusted, and hence was not adapted to low buildings and could not be carried up beyond the length of the ladder. Ihave found that both these limitations are objectionable, and hence have made this improvement, which provides the ladder with an extension E at its top adapted to slide in the grooves or channels 2, as already described, and which itself is equipped with laterally-extending brace or rest B. This extension E may have more or less length relatively, so as to be moved a considerable dis tance above the end of the ladder itself and also down to approximately near the middle of the ladder or lower, the range of adjustment depending somewhat on the length of the ladder as well as upon the length of the extension. In any event by this construction I obtain a very large accommodation of the ladder to the work and render it useful in places where under the old construction it could not be used at all. The said brace or frame B and platform C are adapted to be folded, and to this end the frame B is provided on each side with a side brace 3, a yoke 4t, and a chain 5, from which the yoke is suspended. the said yoke being adapted to embrace the edge of the extension E and to be freely withdrawn therefrom. When the said frame B is folded, the yoke 4 is withdrawn from extension E. The scaffold or platform C likewise is foldable and is provided with side braces 6, pivotally engaged with the frame of the scaffold at its upper end and with brackets 7 on the sliding frame D, which carry the scaffold. At its rear the scaffold engages down over a projection 8 and is locked by spring-pressed pawl 9. It follows when the scaffold is used the parts are supported and locked in position relatively, as seen in Fig. 3; but when folding is desired the pawl 9 is withdrawn and the scaffold is tilted off the lug or projection 8 and is free to drop down against the ladder in a folded position.

Both frames D and E are supported in the same channels in the sides of main frame A, as already described, and both have corresponding mechanism for engaging them with the ladder as they are adjusted to higher or lower elevations, so that the same reference characters belong to both. Two forms of mechanism for locking the said parts upon the ladder are shown in Figs. 7 and 8, and either may be used. In Fig. 7 I show aspringpressed pivoted dog Gr, behind which there is a coiled spring cl, and when the scaffold D or extension E is raised or lowered the said part is first raised to press the dog back, and then the locking-bolts 10 will shoot into the central orifice 11 and hold the said dog back out of engaging relation with the recesses or notches 12in one edge of grooves or channels 2. Frame D or E can then be moved up or down at pleasure without encountering the dog to lock the same; but when. said lockingbolts are withdrawn dogs Gr will be pressed outward into engaging position by their springs and engage in the first set of notches 12 that come in their pathway. The bolts 10 are withdrawn by pressing the foot upon the pedal 13, and a T-shaped member 14 serves to operate said bolts through said pedal. In Fig. 8 the modified form of spring-pressed dog H is arranged at right angles to that shown in Fig. 7, and in this case instead of a bolt to lock the dog out of engaging position the dog is controlled by means of a link 15, engaged therewith to withdraw the bolt.

'A pulley-andrrope mechanism L connects frames D and E, the frame D and platform C being suspended from frame or extension E instead of being engaged with the ladder A, as formerly. This way both frames and the rope and tackle can be bodily removed from theladder, and this also enables me to avail myself of the higher elevations to which the scaffold may be raised by reason of its connection with the extension-frame E rather than the top of the ladder.

The brace-frame B is pivoted at 18, and its rear side extension behind said pivot engagesbeneath a shouldered extension 6, which will prevent said frame from dropping even if its support through brace 3 were withdrawn. By my old construction the ladder was always top-heavy,

because the brace frame was confined to the top and could not be lowered therefrom. By my present construction I can raise the ladder like any ordinary ladder and then run the brace B andextension E up as far and as fast as the work may need. A workman can also stand on the platform and raise the extension E and then pull himself and platform up and then move said extension again, and so on till he reaches the top of the ladder. He can also run both down and remove them before the ladder is lowered.

What I claim is 1. The body of the ladder provided with guideways extending to the top thereof, an extension for said ladder and a platform supported from said guideways, means to raise and lower said platform in respect to said extension, and means to lock said platform and extension separately at different elevations, the said extension and platform having immediate engagement with the body of the ladder, substantially as described.

2. The ladder having guideways on its sides running to the top thereof. an extension adjustably supported in said guideways toward its top and a laterally-extending brace for the ladder on said extension, in combination with a platform slidably engaging directly in said guideways and connections from said platform to said extension constructed to raise and lower the said platform and to suspend the same from the said extension, scribed.

3. The ladder and the extension supported thereon, a platform slidably supported on the ladder below said extension, flexible lift mechanism for the platform connected with said extension and separate locking mechanism for said extension and platform, and means adapted to be engaged by the foot to operate said locking mechanism and comprising oppositely-projecting bolts, substantially as described.

4. The ladder and the extension slidably supported on the top thereof, a platform-frame slidably supported on the ladder beneath said extension, and a rope and tackle connecting said extension and platform-frame, substantially as described.

5. The ladder having grooves inside runningto its top,in combination with a platformframe, and an extension-section engaged in said grooves one above the other, a lock for each of said parts, and means supporting said platform-frame from said extension-section, substantially as described.

In testimony whereof I sign this specification in the presence of two witnesses.

MARTIN BAUER.

Witnesses:

R. B. MosER, (J. A. SELL.

substantially as de-

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