Title:
Stepladder
United States Patent 2364048


Abstract:
The principal objects of this invention are to provide a step ladder with lateral braces which may be extended to either side thereof or to both sides simultaneously so as to prevent the ladder from tipping sideways and causing serious injury to the person using the same. A further object...



Inventors:
Barkey, Isaac S.
Application Number:
US48794443A
Publication Date:
12/05/1944
Filing Date:
05/21/1943
Assignee:
Barkey, Isaac S.
Primary Class:
Other Classes:
182/176
International Classes:
E06C1/20; E06C7/42
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Description:

The principal objects of this invention are to provide a step ladder with lateral braces which may be extended to either side thereof or to both sides simultaneously so as to prevent the ladder from tipping sideways and causing serious injury to the person using the same.

A further object is to provide a simple, strong and durable construction of inter-connected braces which will be inexpensive to manufacture and will effectively retain the ladder legs and braces in their extended position and will readily fold so as to return all parts to their normal position simultaneously.

The principal feature of the invention consists in the novel construction of a ladder Wherein both front and rear legs of the ladder are pivotally connected to a top, and outwardly extensible braces are hinged to the underside of the top member, the front and back members being connected intermediate of their height by links pivotally connected to a cross bar, and the laterally extensible braces are connected to said cross bar by jointed links, permitting independent movement of said braces.

In the accompanying drawing: Figure 1 is a perspective -view of a step ladder constructed in accordance with this invention shown in its fully extended position.

Figure 2 is a horizontal sectional -view through the ladder shown in Figure _1 taken on the line 2-2 of Figure 1.

Figure 3 is a vertical mid-sectional elevational view showing the lateral brace members partly folded inwardly.

Figure 4 is a slightly enlarged perspective detail of the hinged apport connections for the upper ends of the legs and top of the ladder.

Figure 5 is an enlarged sectional detail of a portion of the leg-bracing members.

In the construction herein illustrated the front leg I, which is provided with steps 2, is pivotally connected at its upper end to a pair of sheet metal members 3 which are formed with parallel side portions 4 and 5 spaced apart the thickness of the side rails 6 of the member I. These members are joined at one end by a connecting bar 7.

The side bars 8 of the rear leg member 9 of the ladder extend between the plates 4 and 5 of the members 3 and are pivotally secured therein.

The legs I and 9 are thus pivotally mounted in the sheet metal members 3 and these are rigidly secured to the underside of the top plate 10 of the ladder by suitable screws extending through flanges 11 on the inside of each of the members 3, and flange lugs 12 on the outside of the members 3. 'The lugs 12 are spaced apart and in between these and secured to the underside of -the top plate :10 of the ladder are hinges 1:3.

The hinges 413 have secured thereto the laterally extending brace legs 4 which swing outwardly on the said hinges midway between the legs I and 9. The members I .and . are conneted intermediate of their height by links 15 and '16 pivotally connected respectively to the front leg 1 -and the rear leg 9.

The inward ends of these 'link members ├Żare pivotally connected to the laterally turned lug ends 17 of a pair of flat bars 18 which are :secured together and extend transversely of the ladder. The portion of the paired bars 18 adjacent to the lugs 17 are parallelly spaced apart and shortlinks 19 are pivotally secured within the jaw thus formed.

Pivotally secured to the outer ends of the links 9 are links 20 and the outer ends of the links 'O0 extend into slots 21 in the brace rmembers 14 and are pivotally connected thereto by pivot pins '22 extending transversely through the brace members.

The side members are thus connected by a toggle arrangement of links 19 and 20 to the toggled links 15 Iand 16 connected through the doubled cross bar I8, and when thelegs I 'and 9 are swung inwardly on their pivots in their pivot supports in the bracket members 3 carried by the top plate. or step of the ladder, the links 15 and 16 swing upwardly and the toggle links !19 and 20 are drawn inwardly in the manner illustrated in Figure 3.

It will of course be understood that 'the brace legs -14 must be of greater length than the legs I and 9, and these legs 14 have the lower end portions 22 separate therefrom and secured by hinges 23 on the inside.

Lugs 24 project inwardly from the hinged end portions 22 and a rod 25 -is connected to each of the lugs 24 at one end and extends upwardly and is connected to the pivot joining each of the toggle links 1I9 and 20.

It will thus be seen that 'as the ladder is closed up and the links 15 and 16 swing upwardly they carry the toggle links 19 and 2'0 upwardly, and this upward movement, pulling on the rod 25. breaks the hinged joint 23 connecting the end members 22 of the brace members and swings them inwardly, so that the side brace members will swing clear of the floor.

When the ladder is being opened out and the legs I and 9 are spread apart, the links 15 and 16 are swung downwardly and the downward movement pushes the toggle links 19 and 20 outwardly and downwardly, thereby swinging the members 22 into the outward position, as illustrated in Figure 1, so that the ends will rest upon the floor.

The action of the different parts thus occurs simultaneously and the side brace members are automatically swung outward. If however it is desired that either one or the other of the side brace members should not swing outwardly it is merely necessary for the person handling the ladder to kick the short portion 22 hinged to the member 14 inwardly, and the toggle link connection at the upper end of the rod 25 will swing upwardly, thus allowing the one brace member to remain close in to the side of the ladder while the other one extends outwardly.

Thus a rigid side brace is provided on the outside of the ladder where. the ladder is set up close to a wall and either side may be moved outwardly selectively, or, as previously described, the opening of the ladder automatically throws both of the brace members outwardly so that the structure is braced equally on both sides and it will be effectively supported from tipping sideways in either direction. Consequently a person using the ladder may do so without fear of being upset.

A ladder constructed as described requires no special manipulation to set the side braces in position. Merely by opening it out, by spreading the front and back legs apart the side braces move outwardly automatically. So also in folding the ladder the side braces fold inwardly automatically, but if it be desired to move either of the side braces inwardly in order to bring the ladder close up against a wall, it is very simply accomplished in the manner described.

The parts of the structure are very simple to manufacture and assemble and a simple, strong ladder is produced.

What I claim as my invention is: 1. A step ladder comprising, a top, front and back legs pivotally mounted on the underside of said top, paired links connected to said front and back legs intermediate of their height, a cross bar arranged between and pivotally connected to the inward ends of said paired links, jointed links connected to the ends of said cross bar and extending outwardly, braces pivotally secured to the underside of said ladder top and extending angularly downward and outwardly and having extensible lower ends, means pivotally connecting said jointed links to said braces intermediate of their length, and operable means connecting said jointed links and extensible ends.

2. A ladder comprising, a top, two pair of flanged spaced-apart members secured to the underside of said top in parallel arrangement, front and rear legs pivotally mounted between the parallelly spaced-apart flanged members secured to said top, brace members hinged to said top intermediate of the length of said flanged members and extending downwardly and outwardly therefrom and having extensible ends, toggle links connecting the front and rear leg members intermediate of their height, and jointed links connected to the aforesaid toggle links and extending laterally and pivotally connected to said brace members intermediate of their height and means connecting said extensible ends with said jointed links to move said ends outwardly simultaneously with the outward swinging of said brace members.

3. A step ladder comprising, a top, front and rear legs pivotally connected to the underside of said top, braces pivotally connected to the underside of said top intermediately between said front and rear legs and adapted to swing laterally outward, said braces having hinged extremities adapted to swing inwardly and to form rigid braces when swung outwardly to engage and rest upon the floor, toggle links connecting the front and rear leg members, toggle links connecting the aforesaid toggle links with said braces, and rods pivotally connected to the hinged extensions of said braces and to the toggle links secured to said brace members adapted to swing the hinged extensions inwardly upon the inward swinging of the side braces.

4. A step ladder comprising, a top, front and rear legs pivotally mounted on the underside of said top, links pivotally connected to each of the side members of the front and rear legs intermediate of their length and extending inwardly toward each other, a pair of flat bars secured together and having out-turned lug ends pivotally connected one to each of said links, the ends of n said bars adjacent to said links being spaced apart, links extending in between spaced-apart portions of said paired bars and extending therefrom in right-angular relation to the links connected to the front and rear legs, short links pivotally connected to the links pivoted in the ends of said cross bar, braces pivotally secured to the underside of said top intermediately between said front and rear legs and having slots in their inward sides intermediate of their length to receive the outward ends of the laterally extending links, means pivotally connecting the ends of said links extending into said slots, hinged extensions on the ends of said braces adapted to swing inwardly, and rods connecting 5 said hinged extensions with the jointed laterally extending links connected to said braces.

5. A step ladder comprising, a top, front and back legs pivotally connected to the underside of said top, laterally swingable brace members secured to the underside of said top intermediately between said front and rear leg members, toggle link members pivotally connected to said brace members intermediate of their length and extending inwardly therefrom to permit said Sbrace members being separately operated; a pair of bars rigidly secured together having their end portions spaced apart to receive the inner ends of said toggle links and their extremities turned outwardly, means pivotally connecting the inner ends of said toggle links between the spaced 60 apart ends of said bars, and link members pivotally connected one to each of the out-turned extremities and pivotally connected to the front, and rear leg members intermediate of their length, whereby the legs and braces are con65 nected by toggle link mechanism which operates to raise or lower as the legs are swung inwardly or outwardly.

ISAAC S. BARKEY.