US2372003A

US2372003A - Sectional ladder

Info

Publication number: US2372003A
Application number: US495637A
Authority: US
Inventors: Raymond A Kennedy
Original assignee: Individual
Current assignee: Individual
Priority date: 1943-07-21
Filing date: 1943-07-21
Publication date: 1945-03-20
Anticipated expiration: 1962-03-20

Description

\ March 20,1945. A" KENNEDY v 2,372,003

SECTIONAL LADDER Filed July 21, 1945 3 Sheets-Sheet .1

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March 20, 1945. R. A. KENNEDY 7 2,372,003

SEGTIbNAL LADDER Filed July 21, 1945 3 Sheets-S eet 2 avwwwfo a 1 Rflffen nedy March 20, 1945.

R'. A. KENNEDY,

SECTIONAL LADDER Filed July 21, 1945 5 Sheets-Sheet s W 4;" M siawgg Patented Ma. 20, 1945 UNITED STATES PATENT OFFICE 2,372,003 qSECTIONAL LADDER Raymond A. Kennedy, Sioux City, Iowa Application July 21, 1943, Serial No. 495,637 1 Claim. (erect-51o This invention relates to ladders, and more particularly to a sectional multi-use ladder.

An object of this invention is to provide a sectional ladder wherein the adjacent ends of the sections areinterlocked together so that a firm ladder assembly will be provided. v

Another object of ths invention is to provide a sectional ladder which is so constructed that the sections may be arranged in a number of ways. For instance, in one arrangement the sections may be interlocked to provide a straight ladder. In another instance the sections may be connected togetherin pairs and disposed in'upwardly convergent relation so a toform a high stepladder. In a further instance a low firm stepladder may b formed by using one sect'on as a base and mounting two upwardly conver-gentsections "on the base. Additional arrangements may also be formed which will be readily apparent to the user.

With the foregoing objects in view, and others which may hereinafter more fully appear, the invention consists of the novel construction, combination and arrangement of parts, as will be more spec fically described, and illustrated in the accompanying drawings wherein are shown embodiments of the invention, but it is to be understood that changes, variation and modifications may be resorted to which fall within the scope of the invention as claimed.

In the drawings:

Figure 1 is a detail front elevation partly broken away of a sectional ladder constructed according to an embodiment of this invention,

Figure 2 is an enlarged fragmentary front elevation partly in section showing the connection between the adjacent sections,

Figure 3 is a sectional view taken on the line 3-3 of Figure 2',

- Figure 4 is a detail side elevation of another arrangement of the ladder sections,

Figure 5 i a fragmentary front elevation partly in section of the upper portion of the ladder section shown in Figure 4,

Figure 6 is a fragmentary front elevation partly in section and showing in exploded form the manner of connecting the adjacent ladder sections together,

Figure '7 is a fragmentary side elevation, partly in section, of one of the ladder rails,

Figure 8 is a side elevation of a number of ladder sections arranged as a stair scaffold,

Figure 9 i a front elevation of a number of ladder sections arranged as an indoor scafi'old or shelf support,

Figure 10 is a fragmentary sectional view taken on the line l0-| ll of Figure 9; and Figure 11' isa fragmentary vertical section of a numberof ladder sections arranged a an outdoor scaffold. y

Referring to the drawings, thenum'erals Ill and H' designate apair of ladder sections constructed according to an embodiment of this invention, which are interlocked together in Figure 1 to form a straight ladder.

. desired may be interlocked together to form th desired length of ladder. I The ladder section III is formed of a pair of side rails l2 and I 3, and a plurality of rungs Mare connected between the rails l2 and 13. The rungs l4 "are'arranged so that the end rung will be spaced inwardly from the opposite ends of the section.- The side rails l2 and 13 are alike in construction and may be formed out of wood or other suitable material. The rails, at each end thereof, are formed with outwardly opening notche I5 and i6 and where the rails are formed out of wood they are reinforced against splitting by means of transversely extending rivets or bolts l1 and 18, respectively. The bolts l1 and I8 are disposed at a point spaced inwardly from the inner ends of the notches l5 and I6.

The ladder section II is formed of a pair of parallel side rails l9 and 20, which have secured therebetween rungs 2|. The rungs 2| are intermediate rungs and

opposite end rungs

22 and 23 are secured'transversely between the rails I9 and 20 at a point inwardly from the opposite ends of the rail. The rung 22 has projecting opposite end portions 24 which project beyond the outer sides of the rails l9 and 20, and the rung 23 has projecting opposite end portions 25 which project beyond the opposite sides of the rails l9 and 2D. The projecting end portions 25 are adapted to seat in the notches 15 or N5 of the ladder sections l0, and the rails l9 and 20 are also formed with notches 26 at the opposite ends thereof whereby the rails I 9 and 20 may interlock with an adjacent rung Id of the ladder section ill. The two ladder sect ons 10 and H are firmly locked together against endwise movement by means of resilient hooks 2'! which are pivotally mounted on a pivot member 28 carried by the rails I 9 and 20. There are two hooks 21 at each end of the ladder section I l and the hooks are formed with reverted bills 29 to facilitate snapping of the hooks over a rung II. The ladder section II, at each end thereof, is formed with holes 30 through which a bolt 3| is adapted to engage when a pair of ladder sections, as for instance, a pair of sec- As many sections as may be tions H, are mounted in upwardly convergent relation as shown in Figure 4. At this time the two ladder sections have their lower ends mounted on the end rungs M of the ladder section 18 which constitutes a base section. The ladder section I!) may also be formed with holes 32 in the rails l2 and 13 adjacent the ends of these rails so that bolts 3| may be extended through the holes 32 and holes 30 of a section H when an extension step ladder is formed embodying a pair of interlocked sections l0 and II or other desired arrangement of sections.

When the ladder sections are arranged, as shown in Figure 4, the ladder section II), which is the base section, prevents spreading of the'pair of sections l l, at the lower ends of this latter section and thereby provides a firm foundation for the short step ladder.

In Figure 8 there is shown a further arrangement of the ladder sections wherein a stair ladder or scaffold is provided. Two sections 10 and H are connected together in alignment as hereinbefore described, and then a second section In is bolted as at am to the upper end of the-upper section II. rest on an upper stair tread and this latter section is held against spreading relative to the aligned sections by means of a bracing hook 33 which engages adjacent rungs of theupper sections as shown.

Referring to Figures 9-and .10, there is shown a further arrangement of the ladder sections wherein the sections-are arrangedto :iormga-n indoor scafiold or shelf support. A numberroi sections H! and .H are connected together in alignment and jazseries oi'suchrconneotediseotions are then disposed; in a vertical position '-.at .right angles to awall ,cr other support :34. 'Nailscor bolts 35 are extendcdsthroush bolt holes 3l and 32 in sections 1 hand It, respectively; andengage with the wall34. :Shelf boards. maybe mounted on .the rungs of adiacentisectionsas shown in Figure 9,'and where this arrangement is de- The second section 10 is adaptedto .mounted 'on the horizontal sections llb.

signed as a shelf construction, the boards 36 may be engaged with all of the rungs of the ladder sections.

In Figure 11 there is disclosed an outdoor scaffold constructed from the ladder sections I0 and ii. A number of ladder sections ID and H are disposed in alignment as hereinbefore described, and one section, such as a section H, is disposed at right angles to the connected sections, being locked at its outer end on a section 10 by means of the hooks 21. The inner end of the horizontal section which is designated III) is then mounted on a cleat or board 31 secured to the outer side of the building. A holding wire 38 is then extended through bolt holes 30 and wrapped around nails or'bolts 39 mounted in the cleat 31.

The supporting boards or platform may now be The horizontal sections Hb constitute not only bracing members out also supporting members for the boards or platforms.

I claim:

A scafiold comprising upright ladder members formed of disconnectible ladder sections each having side rails and cross rungs, horizontal ladder sections having side rails and cross rungs, the side rails of the horizontal ladder sections having outer ends detachably engaged with cross rungs of the vertical ladder sections and their inner end portions formed with transverse openings spaced from'their inner ends, a horizontal support extending transversely of the horizontal ladder sections and adapted to be mounted against awall with. inner ends of the horizontal ladder sections restin upon the. horizontal support, anchors carried .by and projecting upwardly fromrsaidisupportadjacent the horizontal ladder sections, and strands passing through said openings and extending towards. saidsupport and engaged. about said anchors to hold the inner ends of the'hori- ,zontal ladder sections upon said: support.

RAYMOND A. KENNEDY.