US1592109A - Stepladder - Google Patents

Description

July 13, 1926. 1,592,1o9

F. L. JACOBS S TEPLADDER Ori in Filed Feb 25, 1922 2 Sheets sheet 2 'mention frederz c/. Jac-05:,

(Ttrolllc forrned of staniped or members, and particularly embodies certain Patented .luiy is, 1926.: I,

FBEDERICK L. JACOBS, 01' NEWRK, NEW JERSEY. i

Fres.

E'EPLDDER.

Application med February`23. 1822, Serial 510. 538,474. Renewed April 2, 1928.

This invention relates to step ladders, and particularly to sheet metal ladders.

lt is the object of the invention to provide a step ladfder of sheet metal construction, such as will combine a maximum of strength and rigidity witii" comparative lightness in weight and adapt it to render more durable service than ladders commonly constructed of wood. I

The invention contemplates the construction of a foldable ste ladder entirely rawn sheet metal novel Structural formations and association of the members comprising the steps and stiles of the ladder.

A preferred embodiment of the invention is illustrated -in the accompanying drawings, Wherein, i

ig. 1 is a perspective view of a'step ladder embodying the features of theV invention.

Fig. 2 is an enlarged fragmentary view in Vertical section on dashed line 2-2 of Fig. 1.

F ig. 3 is a horizontal cross-sectional view on dashed line 3-3 of Fig. 1.

Fig. 4 is a longitudinal Vertical sectional view through the stiles and a step of the ladder on dashed line 4- 4 of Fig. 1.

Referring to the drawings, 1 indicates the -spaced uprights or step stiles of the ladder and 2 a pair of tubular legs for Supporting the upper ends of said stiles. Said legs are suitably connected by brace rods as indicated at 3, and are pivotally engaged at their upper ends with extensions on said stiles, being adapted to Swing thereon and to be held 'extended in an angular relation thereto by means of lthe usual foldably jointed brace arms 4 pivotally connecting said members, as is common in the art.

The uprights or stiles 1 are of sheetmetal channel formation, the marginal edges of the channel walls being return bent and folded upon their inner faces, as indicated at 5, to reinforce and strengthen the free edges thereof. Said stiles are spaced with their channels in opposed relation and are each provided at their upper ends with a laterally extending relatively thick sheetmetal bracket 6, one end of which is rigidly secured within the channel. of the stile/by rivets 7, and the opposite end is pivotally engaged by a bolt or stud 8 with the upper end of the respective legs 2. Each of said lsheet metal of relatively th-in gange may brackets is formed with a pair of integral laterally projecting ears or lugs 9 flush with the upper edge thereof, upon which there is secured by rivets 10 a-sheetmetal plate or platform 11 having a depending flange 12 surrounding the upper ends of said .legs and stiles. (bee Fig. 2). i

Extending between the stiles, at spaced intervals longitudinally thereof, is a series of sheet metal plates or steps 13 of inverted channel form, having the free. edges of the channel 'walls return bent and marginally folded as at 14 to reinforce the same, and also having struck into the upper face thereof a plurality of spaced longitudinal depressions 15 forming depending ribs 16,

which further serve to reinforce and stitfen side walls of said steps upon the side walls v of said stiles, which Overlapping portions of said members are secured together by rivets 17, as best shown in F igs. 2 and 4. It is also preferred to provide certain of said steps with angle braces 18, secured by rivets V19 atopposite ends respectively to the channel Walls of said steps and stiles, as a means of reinforcement.

At the lower ends of the stiles the channels are closed by means of angle brackets 20, respectively inserted therein and secured by rivets 21 flush with the extremities of said stiles to provide suitable end bearings therefor.

It will be apparent from the foregoing that by the employment of the described Structural formation and association of parts, and particularly the formation of the channelled members, in which the free edges of the channel walls are folded or lapped,

rendered suitable to secure the desired strength and lightness as well as to provide a comparatively smooth exterior finish at the exposed'edges of the channel members.

What I claim is:

1. A step ladder comprising a pair of opposite channel shaped sheet-metal-stiles, a plurality of vertically spaced step members vrigidly Connecting said stiles, a pair of brackets having their front portions engaged within the channels of said stiles at the upper ends of the latter and having rearward projecting portions, means ofseourng the front portionpf said brackets to said stiles, and leg members pwoted to the rearwardlyv projecting portlons of sald brackets.

2. A step ladder comprising a pair of opposite channel-shaped sheet-metal stiles, a plurality of vertically .spaced step members rigidly Connecting said stiles, a pair of brackets having their front portons engaged within the channels of said stiles at the upper ends of the latter, and having rearwardly projecting portions, lugs projecting from the top portions of said bracketsto- Ward each other, leg members pivoted to the rearwardly projecting portions of said In. testimony whereof I sign this specifi- 30 cation.

FREDERICK L. JACOBS.

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