US780820A

US780820A - Scaffold.

Info

Publication number: US780820A
Application number: US20310504A
Authority: US
Inventors: Oswald Schwerin
Original assignee: Individual
Current assignee: Individual
Priority date: 1904-04-14
Filing date: 1904-04-14
Publication date: 1905-01-24
Anticipated expiration: 1922-01-24

Description

PATENTED JAN. 24, 1905.

0. SOHWERIN.

SCAFFOLD.

APPLICATION FILED APR..14, 1904.

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WITNESSES:

PATENTEDJAN. 24, 1905.

0. SCHWERHL SGAFPOLDQ APPLIOATION FILED APR. 14, 1904.

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No. 780,820. PATENTED JAN. 24', 1905.

' 0. SOHWERIN.

SGAFFOLD.-

APPLIOATION FILED APB.14, 1904.

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Patented January 24, 1905.

PATENT OFFIC OSWALD SOHWERIN, OF CHICAGO, ILLINOIS.

SQAFFOLD.

SPECIFICATION forming part of Letters Patent No. 780,820, dated January 24, 1905. Application filed April 14:, 1904:. Serial No. 203,105.

.To all whom, it may concern:

Be it known that I, OSWALD SOHWERIN, a citizen of the United States, residing at Ohicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in scaffolds; and I do hereby descaffold can be safely hung from variously' constructed roofs. A further object is simplicity of construction, so that the parts can be readily assembled and taken down.

Improved details in the construction and arrangement of the various parts of the invention will be apparent from the detailed description hereinafter when read in connection with the appended drawings, in which- Figures 1, 2, and 3 are plan views of differ ently-constructed roofs, showing various applications of the invention. Fig. 4 is a front I elevation of the ladder-scaffold hereinafter described. Fig. 5 is a side elevation thereof, and Fig. 6 a similar view thereof, showing the same folded. Fig. 7 is a front elevation showing another manner of hanging the scaffold illustrated in the last three views. Fig. 8 is a front elevation of the supporting-frame for' the beams from which the scaffold hangs.

Fig. 9 is a front elevation of the supportingstand shown in Fig. 2.

Referring specifically to the drawings, more particularly to Figs. 1 and 8, A denotes two chains, each having at their outer ends a large hook ato catch over the edge of the roof, as shown. The other ends of each chain are hooked, as at a, to a jack-screw B, whereby they are stretched tightly across the roof.

The chains hold beams C, one on each side of the jack-screw, and the front end of each beam has a hook D, from which the scaffold-platform a is suspended. The inner end of each beam has a tubular casting E, through which the chains pass, and a pin 0, extending through the casting and one of the links of the chains,

therein, holds the beam from slipping sidewise thereon. The beams are readily adjusted on the chain according to the width of the platform and will be securely held on the roof by the chains after they are tightened up sufficiently by the jack-screw. Cross-braces F are also provided which extend under cleats f on the beams and are fastened thereto by bolts or pins f; The braces are provided with a number of bolt-holes whereby they can be adjusted according to the distance between the beams. braces where they cross and further secures them together. A brace Gr also extends across the beams near their inner ends and is secured thereto in the same manner as the cross-braces F. The brace G has a hasp-lock H to secure the lever I of the jack-screw, and thus prevent the chain from loosening after it is stretched across the roof. I

If the roof has a railing, the following means are provided to elevate the beams 0 above said railing:

J comprises a frame in which a block K is slidably mounted and through an opening in which block the beams extend, oneof these supporting-frames being provided for each beam. The frame has guide-slots j to receive guide-pins on the block. To the upper end of the block a chain L is attached, which A bolt or pin f" extends through the passes over rollers M and over a Windlass m on the frame, whereby the chain is wound and unwound to raiseand lower the block to elevate the beam according to the height of the railing.

In Fig. 2 I have shown the manner in which the chains are fastened to a roof where the adjoining houses do not permit them to be stretched from one side of the roof to the other, as shown in Fig. 1. In this case the chain extends between the front and rearends of the roof, an additional chain being used for the extra length, if necessary. The beams C are secured to the chain in the following manner:

0 denotes a supporting-stand having at its outer end stems 0, which extend through the tubular casting F at the ends of the beams. The outer ends of the stems are threaded to receive a nut 0, by which the beams are socurely held from slipping off. The supporting-stand also serves to space the beams and has at the middle a tube N, through which one of the chains extends. A pin it extends through the tube and one of the links of the chain therein to prevent the supporting-stand from slipping back and forth on the chain. Thesupporting-stand has legs 0 which are hinged, so that they can be folded up when the stand is not in use. In this form the chain is passed through the tube N and hooked over the front and rear edges of the roof, as shown, and then tightened up by the jackscrew. The supporting-stand is placed on the roof at suitable distance from the front edge thereof, according to the extent to which it is desired to have the beams project beyond the roof, after which the beams are secured in the manner already described.

In Fig. 3 an arrangement is shown for houses having an irregular front or a baywindow. In this case the platform-scaffold shown in the preceding views will not be used, a ladder-scaffold, as illustrated in F 3 to 7, being used. The supporting-beams C are secured to the chain in the same manner as in Fig. 1, only they are much closer together and are both on one side of the jackscrew. By moving the chain back and forth and shifting the beams to different positions along the chain all parts of the front of the house can be convenientlyreached by a workman on the scaffold. The scaffold in this case consists in a ladder the stiles P of which are formed at their upper ends into hooks P, the ends of which extend under straps p on the inner sides of the beams G. On the outer edge of the stiles hooks 7 are secured, which straddle the beams. 1t will be noticed that the beams are reversed and the hooks Dare on top, so that the ladder cannot slip off endwise, and the cross-braces F are also removed. A frame Q is slidably mounted on the stiles of the ladder, to which aplatform R is hinged, as at r, and provided with a railing '1'. By means of a screw S, which is threaded through a block .9, extending between the stiles near the bottom of the ladder, the frame Q can be slid up and down on the stiles and the platform thus adjusted to the heightdesired by the operator. The upper end of the screw has ahand- Wheel 8 for turning it and extends loosely through a tubular bearing q, formed on the frame Q. A collar 5 on the screw engages the top of the bearing, so that when the screw is turned the frame Q will travel with it according to the direction in which the screw is turned. Under the platform put-logs T are supported on cleats T and have at their outer ends rollers 2?. The put-logs are adjustable back and forth by a screw U, which is threaded through a block 11, secured to the under side of the plat'forn'i. The screw has a suitable hand-wheel V for turningit. \Vhen not in use. the platform can be folded up, as shown in Fig. 6.

In Fig. 7 means are shown for hanging the ladder-scaffold from a tower. These comprise a ring W, which is slipped over the tower. The ring carries two chains \V, having at their lower ends hooks w, on which the ladder is hung.

The constructions above described permit a scaffold to be hung from variously-constrllcted roofs and an ordinary platforin-scailold can be hung with equal facility as the form of ladder-scal'l'old described. A wide range of usefulness isthus had.

Having thus described my invention, what is claimed as new, and desired to be secured by Letters Patent, is

1. The combination with a scaffold, of a chain extensible across a roof and lmving hooks to engage opposite edges thereof,n :ans for tightening the chain, and beams held by the chain and supporting the scaffold.

The comlr-ination with a seall'old,o f chains having at their outer ends a. hook to engage the edges of a roof, a jacl\'-screw connected to the inner ends of the chains. and beams held by the chains and supporting the scaffold.

3. The combination with a scaffold of a chain extending across a roof and having hooks to engage the edges thereof, a jackscrew for tightening said chain, beams ha\'-- ing at their inner ends a tubular casting through which the chain extends and at their outer ends means for supporting the scaffold, and adiustable braces extending between the beams.

f. The combination with a scaffold, of a ,chain extending across a. roof and having tightening said chains, beams from which the scaffold is hung, means :uljustable along the chain and connected to the inner ends of the beams for supporting them.

ln testimony whereofl have ailixed my signature in presence of two witnesses.

OS\VALD SCI'IW'ERIN.

\Vitnesses:

KA'II n M (JCAR'IY, H. G. BATCIIELOR.