US2191051A - Scaffold ladder - Google Patents

Description

Feb. 20, 1940. R. A. UE CKER EITAL SCAFFOLD LADDER Filed Se t. 19, 1938 r 0 9 w 1 t v.5? m m 3 40%. m a? Wm? 2 fi/w $7 Feb. 20,1940. R. UECKER ETAL 5 SCAFFOLD LADDER Filed Sept. 19; 1938 4 2 Sheets -Sheet 2 jig 7" Q7/4 30 .{rar-eg Patented Feb. 20, 1940 UNITED STATES PATENT, orrlce Reinhold A. Uecker, Ingar G. Rambo, and David E. Beatty, Wauwatosa, Wis.

Application September 19,1938, Serial No. 230,648

' 11 Claims. (01. 2213-45),

This invention relates to scaffolds and more.

particularly to a ladder for use on scaffolds.

One object of the present invention is to produce a ladder for use on scaffolds which will be I moreeconomical to manufacture than those now on the market.

Another object is to produce'a sectional ladder for use on scaffolds in which the danger from failure is reduced through suitably interconnecting the sections.

Fig. 2, looking in the direction of the arrows;

and 1 Fig. 4 is a perspective view of the ladder.

5 Referring to the drawings in which like numerals indicate like parts throughout the several ,views, the scaffold is shown as composed of a plurality of end frames l superimposed on each other with the superposed frames being joined I by coupling pins II. The frames! are connected to other frames in the same level by cross braces i2, which are joined to the end I frames by bolts and wing nuts (not shown).

Each end frame is composed of two parallel 8 vertical posts l3, one of which is shown, which are held in spaced parallel relationship by horizontal braces l4--l4.

All the above structure is, in itself, old, and

is more fully described in the United States 0 patent to Reinhold A. Uecker, No. 2,043,498, issued 1 is engageable around the post I3 and has ahook portion 2| engageable over the horizontal brace I l. A rung 23 is attached to the bracket so as to extend at right angles to the plane of the end frames l0.

Side bars 25 are fixed on the opposite ends of the rung 23 so as to be parallel to each other in and to the post IS. The side bars are preferably brackets more securely on the rungs, braces 34 made tubular and are provided with pins 26 at the upper ends which are engaged by the lower ends of the tubular side bars of the superposed ladder to insure the side bars remaining in true alinement and to provide an'extra safety factor inthe event of a failure of the bracket 20. The side bars 25 support a plurality of rungs 21, 28, 29 parallel to the rung 23, the rungs 21, 28, 29 being fixed, preferably by welding, between the side bars 25.

A second'bracket 30 is carried by the rung 28, and is engageable around the post l3. An inverted U-shaped yoke 3| is formed on the inner end of. the bracket. 30 and extends at right angles to the body of the bracket, or parallel to In the rungs 23 and 28. A second yoke 32, parallel to and in alinement with the yoke 3| is formed' on the opposite side of the bracket from the yoke 3|. A latch 33 is pivotally mounted in the yoke 3|. and .engages in the yoke 32. and actsboth as 'a latch and as a supplemental support for the ladder in the event of a failure of the bracket 20.

In order to strengthen the-ladder and to fix the a and are provided for the brackets 20 and 30 respectively. The braces 34 and 35 are closely adjacent the rungs 23 and 28 respectively, and are secured to both the brackets 20 and 30 and m w to both side bars 25.

said brace, a rung attached to said supporting bracket, a side bar connected to each end of said rung, a brace joining the lowerportion of said bracket with the side-bars, and a plurality of rungs carried by said side bars. v 2. A sectional ladder for use with a sectional scaffold or the like havinga vertical post and a horizontal brace connected thereto, saidladder comprising, a bracket engagea-ble around said post and supported on said brace, a rung attached to said supporting bracket, a side bar connected 'to each end of said rung, a plurality of was carried by said side bars, and means on said side bars engageable with the side bars of I an adjacent ladder section to lock the side bars 1 in alinement with the side bars of said last named section. I

3. A sectional ladder for use with a sectional scafiold having a vertical post and a horizontal brace, said ladder comprising, a bracket engageable over said brace, a rung fixed to said bracket, a tubular side bar fixed to each end of said rung, a, plurality of rungs carried by. the side bars, and a connecting pin fixed in one end of said side bars engageable with the tubular side bars of. an adjacent ladder section to maintain the sections against accidental disengagement. 4. A ladder for use with a scafiold'having a vertical post and a horizontal brace, said ladder comprising a bracket engageable around saidplurality of rungs carried by the side bars, and

side bars attached to and carried by said rung.

5. A ladder for use with a scaffold or the like having a vertical post and a horizontal brace,

. said ladder comprising, an attaching bracket enby said sidebars, a second bracket connected with one of said rungs and engageable with said post, and a latch carried by said second bracket.

6. A sectional ladder for use with asectional scaffold or the like having a vertical post and a horizontal brace connected thereto, said ladder comprising, a bracket engageable around said post and supported on said brace, a rung attached to said supporting bracket,'a side bar connected to each end of said rung, a plurality of rungs carried by said side bars, means on said side bars engageable with the side bars of an adjacent ladder section to lock the side bars in alinement with the sidebars of said last named section, a second bracket connected with one of said rungs and engageable with said post, and a latch carried by said second bracket.

7. A sectional ladder for use with a sectional scaffold having a verticalpost and a horizontal 1 brace, said ladder comprising, a bracket engageable over saidbrace, a rung fixed to said bracket, a tubular side bar fixed to each end of said rung, a plurality of rungs fixed between said sidebars, a connecting pin fixed in one end of said side bars engageable with the tubular side bars of an adjacent ladder section to maintain the sections against accidental disengagement, a second bracket connected with one of said rungs and engageable with said post, and a latch carried by said second bracket.

8. A sectional ladder for use with a sectional scaffold or the like having a vertical post and a horizontal brace connected thereto, said ladder comprising; a bracket engageable around said post and supported on said brace, a rung attached to said supporting bracket, a side bar connected to each end of said rung, a brace connected to said bracket adjacent the lower end thereof and joining said bracket with said side bars, a plurality of rungs carried by said side bars, and means on said side bars engageable with the side bars of an adjacent ladder section to lock the side bars in alinement with the side bars of an adjacent section.

9. A sectional ladder for use with a sectional scaffold having a vertical post and a horizontal brace connected therewith, said ladder comprising, a bracket engageable over said brace, a rung fixed to said bracket, a tubular side bar fixed to each end of said rung, a brace member joining the lower portion of said bracket with said tubular side bars, a plurality of" rungs carried by said side bars, and a connecting pin fixed in each of said sidebars engageable with the tubular side bars of an adjacent section to maintain the sections against accidental disengagement.

10. A sectionalladder for use with a sectional scaffold or the like having a vertical post and a horizontal brace connected thereto, said ladder comprising, a bracket engageable around said post and supported on said brace, a rung attached to said supporting bracket, a side bar connected to each end of said rung, a supporting brace connecting the lower end of said bracket with said side bars, a plurality of rungs carried by said side bars,'means on said side bars engageable with the side bars of an adjacent ladder section to lock the side bars in alinement with the side bars of said last named section, a second bracket connected with one of said rungs and engageable with said post, and a latch carried by said second bracket.

11. A sectional ladder for use with a sectional bars, a connecting pin fixed in one end of said side bars engageable with the tubular side bars of an adjacent ladder section to maintain the sections against accidental disengagement, a second bracket connected with one of said rungs and engageable with said post, and a latch carried by said second bracket.

REINHOLD A. UECKER. INGAR G. RAMBO. DAVID E. BEATTY.

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