US1520414A - Ladder - Google Patents

Description

De, 23, 1924.v 1,520,414

D. A. HAMlL'roN LADDER Filed Nov. 2o, 1922 31a/ventola Patented Dec. 23, i924.

EFICE.

DON A. HAMILTON, F SALT LAKE CTY, UTAH.

LADDER.

Application led November 20, 1922.

To all whom it may concern.'

Be it known that l, Don A.. HAMILTON, a citizen of the United States, residing at Salt Lake City, in the county of Salt Lake and State of Utah, have invented certain new and useitul improvements in Ladders, ot' which the following is a specification.

rlhis invention relates to ladders, and more particularly to a ladder termed oit a plurality of jointed sections.

An object of the invention is the provision of a knockdown ladder that can be quickly assembled and disassembled to produce a rigid construction.

A further object is the provision ot a clamping element for the leg sections that will also retain the rungs in position.

In the accompanying drawings, l have shown one embodiment of the invention. In this showing:

Figure 1 is a front elevation ot the ladder assembled,

Figure 2 is a side elevation,

Figure 3 is a detail perspective view showing two adjacent leg sections disassembled,

Figure 4 is a transverse sectional view on line 4-4 of Figure 2, and,

Figure 5 is a similar view on line 5--5 of Figure 2.

Referring to the drawings, the reference numeral 1 designates generally the leg sections or' the ladder, and 2 the rungs. is shown, the leg sections are substantially rectangular in horizontal cross section and the rungs are cylindrical. The end ot each leg section is provided with a projecting lug 8. The inner edge oi the lug is provided with a portion 1, parallel to the outer edge and is further provided with an inclined or angular portion 5. As shown (see Figure 3) the lugs on the adj acent ends oi two leg sect-ions are arranged on opposite sides and are adapted to interlock. A. metal band 6 is arranged around the edge ot' each leg section, forming a space 7 Yfor the reception oi the end of the adjacent lug. The inclined faces 5 are provided with substantially semicircular recesses 8 which aline when the leg sections are assembled, and are adapted to receive a bolt 9, carried by a clamping plate 10 arranged on the inside of the ladder. As shown, this plate is provided with vflanges 11, adapted to embrace the 'front and rear edges of the leg sections. A plate 12 is arranged on the exterior oi the leg and this platev its provided with an opening 13 for Serial N0. 602,108.

the reception oi the bolt 9. A wing nut let is arranged on the bolt to retain the clamping element in position. fldjacent the ends the plate 12, it is reduced in thickness as at 15 to allow i'or the thickness o' the metal band 6. Flach oi' the metal bands is provided with openings 16 and the projecting portion oi each leg which is received within the space is provided with an opening 17, adapted to aline with the opening 16 of the surroundin-Pr band. The ends 15 ot the outer clamping plate are provided with pins 1S adapted to be received in these openings.

The inner plate 1() is provided with a cylindrical socket 19 for the reception ot the rung 2.

The operation olf the device will be apparent from the Yforegoing description.

When the ladder is to be assembled, the ends ot the adjacent leg sections are brought together with the projections l received in the spaces i' Yformed by the bands 6. The inner clamping plate 10 is then arranged on the inner side ot' the leg and the bolt 9 passed through the opening 10. The outer clamping plate. is then placed in position with the pins 18 arranged in the openings 16 and the nut 11 tightened on the projecting end oiE the bolt. lt will be apparent that the clamping plates together with the pins 18 form a substantially rigid construction which permits the ladder to be subjected to the same use as a rigid ladder having legs formed in one piece.

it is to be understood that the iorm of my invention herewith shown and described is to be taken as a preferred example ot the same, and that various changes in the shape, size, and arrangement of parts may be resorted to without departing from the spirit ot the invention or the scope of the subjoined claims.

Having thus described my invention, l claim:

1. ln a ladder, a sectional leg comprising a plurality ot sections, a projection formed on each end of each section and adapted to interlock with the end oi? the adjacent section, and clamping elements, each of said clamping elements comprising a plate arranged on. the. inside of th-e leg, a bolt carried by said plate and projecting through the leg sections, a plate carried on the exterior of said leg sections and provided with an opening' for the reception of said bolt, and pins carried by said exterior plate, said pins CII beingadapted to be received in openings in the adjacent leg sections.

In a sectional'ladd-er7 a plurality of leg sections, the ends oifvsa-id sections being provided with projections and recesses, the projection on the end or' one leg section being adapted to loe received in the recess of tlie adiacent leg sectioin' a` clamping element com prising a plate adapted to be arranged on tlie inside of said leg sections, said plate being provided with flanges adapted to extend over the edges of said leg sections, a bolt extending from said plate and projecting through said leg sections, an exterior plate liaving an opening for the reception oi said bolt, and means 'for securing a rung to said first mentioned plate.

3. In a sectional ladder, a pluralit)Y of leg sections, the ends of said leg sections being provided with projections and recesses, tlie 20 projection on the end of'o'ne leg section being adapted to be received in the recess of the adjacent leg sectiomaplate surrounding the end of each of said leg sections adjacent said recess, and a clamping element comprising 25 in testinion)Y whereofj ll atlix lmy signature.

in presence oiJ two Witnesses.

DON A, HAMLTON. llVitnesses D. CASTLE, l?. L. HARTWELL.

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