US1577835A - Scaffold - Google Patents

Description

March 23 1926.

O. F. MANN SCAFFOLD led April 50, 1924 rammed Mar. 23, 192e.

UNITED STATES 1,577,835. PATENT OFFICE.

OSCAR F. MANN, F INDIANAPOLIS, INDIANA, ASSIGNOR TO NINA C. MANN, 0F INDIANAPOLIS, INDIANA.

SCAIFOLD.

Application led April 30, 1924. Serial No. 709,969.

.lumber ordered for the building under erection, with which to make the uprights, braces and platforms, and to unite the pieces by u nailing them together, with the result that upon metal angle-bars 7, 7, arranged in the lumber is full of nails, and much of it so split and damaged as not to be available for the purpose originally intended when taken down.

Another object of my invention is to utilize less lumber, and that without nailing it, or subjecting it to danger of damage by use in the scaffold.

A further object is to provide a safe and inexpensive scaffold.

I accomplish all of the above, as well as other minor objects which will hereinafter appear, by the mechanism illustrated in the accompanying drawing, in which- Fig. 1 is a side elevation of a scaffold embodying my invent-ion, same being shown beside a brick wall under construction. Fig. 2 is an end elevation of the same. Fig. 3 is a section on the line 3 3 of Figs. 1 and 2, showing the scaffold platforms and supports in top plan view, Fig. 4 is a cross-section of the upper platform on the line 4-4 of Fig. 3, and Fig. 5 is a cross-section on the line 5 5 of Fig. 2.

i Like characters of reference indicate like parts in the several views of the drawing.

A workingmans platform 6, is made out of two two-by-eight inch planks which rest pairs and united by bolts 9, which pass through .the bars and also through spacers 10, between each.

The spacers 10 as here used are made out of channel-iron, the perforated parallel lian es of which bear against the bars 47, 7, as s own in Fig. 5. The pair of bars 7, 7, receive triple two-by-four inch vertical timbers 11. between them, with a sliding,r fit. Movement of the vertical timbers in the directions of their narrowest dimensions is prevented by spacers 1() and bolts t) against one edge of each, and by bolts 12 against the other edge.

Each timber l1, is provided with a longitudinal .series of holes 13, in which pins 14A are inserted to retain a given vertical position of the bars 7, 7 on the timbers 11.

The lower ends of the triple timbers 11, rest upon a wide plank 15, to distribute the load on soft ground, and the tops of the triple timbers are preferably joined by a pair of separated two-b v-four timbers 16 and 17, and by a pair of diagonal braces 18 and 1), bolted to the members 11, in the manner best shown in Fig. 2. The lower timber 17 preferably projects outwardly to support a metal clip 20, in which a pulley-block (not shown) may be engaged to hoist building material to a platform 2l, said platform belng elevated above that on which the workman stands.

Only the two outermost ones of cach set of triple uprights 11, are utilized for supporting the platform 21. These are held between a pair of angle-bars 22. 22, united by bolts 9 and 12, and separated by spacers 10, as described for the bars 7.

are connected with the bars 7 by a pair of diagonal brace-bars 23.

The top platform 21 usually comprises two two-by-eight inch la-nks 26 and 27, each laid in and against t e inner angles of the respective bars 24, and by outside two-by-four pieces 28, 28, that only extend to, but do not pass the uprights 11. Metal straps 29 are laid across the top of the platform thus made up, and the straps are bolted to an angle-bar below where there is such, or to another similar strap 30, vplaced transversely of and under the platform.

Where the platform timbers are not long enough to reach from one set of uprights 1l, to the next, I join them anywhere by insert- The bars 22 I ing the body-{iange of an inverted T-bar 31 between the timbers to be joined and extendin a suitable distance for strength on each si e of the joint, and clamp the ends of the bars 3l between a pair of cross-straps l29 and 30, as shown.

The angle-bar pairs 7, 22 and 24, bolted together and braced as above described, form a unit that can be carried easily and placed by one man. These will be used every 16 or 18 feet apart around a. building under construction, to make a scaffold going ent-irely around the building if so desired, or extending only part way around at a time, and. moved further as required.

By placing clips 20 between the two outer uprights 11, on timbers 17, along the whole length of the scaffold, and connecting the clips by block-a-nd-tackle with the metal unit below, the entire scaffold may be lifted to keep pace with the laying of the wall of the building, and the raised positions of the scaffold will be retained by appropriately changing the pins 14 to upper holes 13. The scaffold may be lowered by a reverse operation.

'lhe uprights 11, will generally be retained for scaffold use, but the platform-boards which have not been cut, -or driven into with nails7 are as good as new for use in the con- .struction of the building, and will usually be so used.

That I claim as new is 1. A scaffold comprising a platform, a pair of horizontal bars extending transversely of and under the platform and supporting it, spacers between the pair of bars, bolts rigidly uniting the pair of bars, a second like pair of horizontal bars above the first pair, diagonal braces connecting the two pairs, a pair of bars crossing and supported on the second pair, diagonal braces fronrthe ends of the cross bars to the' first pair of horizontal bars, a second platform on the second pair of bars and the cross bars, a plurality of verticalA supporting members slidingly assembled betweeny the s aced apart bars of both horizontal pairs o bars, upon which the horizontal pairs are vertically adjustable, and means for obtaining a given adjustment of the horizontal pairs on the vertical members.

2. A scaffold comprising triple vertical supporting members, a pair of horizontal angle bars slidingly receiving all of the vertical .supportin'g members between them, a second shorter pair of horizontal angle bars above the first pair slidingly receiving the two outermost of the triple sup )orting members between them, spacers holding both pairs of horizontal bars apart a-nd bolts holdlng them together, said spacers and bolts also .preventing lateral displacement of the vertical members in the directions of the lengths of the pairs, diagonal braces between the upper and lower pairs of angle bars, a lthird pair of angle bars upon and at right angles with the second pair, diagonal braces extending from the ends of the third pair of bars to the first pair of bars, a platform on the second and third pairs of bars and a second platform on the first pair of bars spaced laterally with respect to the first platform.

3. In a platform joint for scaffold platforms, the combination with a plurality of timbers comprising the width of the platform, some of said timbers being transversely divided with abutting ends, of inverted T-bars extending. an appreciable distance on each side of said transverse divisions with the stem-flange of the T-bar between adjacent timbers, a cross-bar under each end of the T-bars, a cross bar upon the platform lover each of said under cross bars and bolts connecting each pair of upper and lower cross bars together to form clamps.

Signed at Indianapolis, Indiana, this the 28th day of-April 1924.

OSCAR F. MANN.

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