US1643649A - Ladder - Google Patents

Description

sept. 27,1927. 1,643,649

. T. THOMPSON LADDER Filed May 18. 1926 Patented Sept. 27, 1927.

UNITED STATES THOMAS THOMPSON, OF BRIGHTON, IOWA.

LADDER.

Application filed May 18,

A specific object ot my invention is to provide improved means for securing the rungs in place upon the uprights of the ladder.

Other objects of my invention will become apparent as the detail description progressesl reference being had to the accompanying drawing, wherein Fig. 1 is a front elevation of a portion of the ladder which embodies the novel 'teatures of my invention.

Fig. 2 is a vertical central section through one of the uprights and it illustrates the vmanner in which I secure the rungs to the uprights.

Fig. 3 is a section taken on line 3-3 of Fig. 2. y

Figs. 4 and 5 are perspective views of a plate which forms a part of my improved ladder.

Fig. 6 is a detail sectional view. j

In the drawing the reference character 10 designates in its entirety a ladder embodying the novel features of my invention. The ladder 10 comprises a pair of uprights '11, a plurality ot rungs 12, and a plurality of bolts 18, a bolt 13 being provided for each of the rungs 12.

1s shown in Figs. 1. 2, and 3, the rungs 12 are substantially cylindrical in form and each of them has each of its ends seated in a socket 14 formed in each of a plurality of plates 15. Each plate 15 is Yprovided with an integral annular iange 16 which 'forms the socket 14 and which is adapted to snugly encircle an end of the rung associated with the plate. Each plate 15 is also pro-- vided with an outwardly projecting integral lug 17 and a downwardly extending integral lug 18. The lugs 17 are adapted to seat or to be driven into holes 19 formed in the uprights 11 and each of the downwardly projecting lugs 18 has an aperture 20 which reg- 1926. serial No.'109,ss1'.

isters with an aperture 21 in its associated upright 11. The apertures 20 and 21 are adapted to receive the aforementioned bolts 13, each bolt 13 having each of its ends threaded as at 22 to receive a washer 23 and a nut 24 y It will be readily understoodv that the bolts 13 serve to hold the several described parts of the ladder in an assembled condition as the nuts 24 may be tightened upon the bolts to bring the uprights 11 into positions wherein the rungs 12 are iirmly seated in the sockets 14 of the plates 15, the rungs 12 serving as struts and the bolts 13 serving as tie rods j It willbe noted that the outwardly projecting lug 17 ot each plate 15 is eccentrically disposed with respect to the axis of its associated cylindrical rung 12. This construction negatives any tendency of the plate to revolve about the axis of the rung. And the bolts 13 prevent angular displacement of the plates 15 relative to their lugs 17, thus insuring rigidity in the ladder.

I have shown a solid rung 12 in Figs. 1-3, which can be made of wood, but I may also use a hollow steel rung 12. as shown in Fig. 6. Other changes in the form, construction and arrangement of parts may be made without departing from the spiritand without sacrificing the advantages of the invention and Iv reserve the right to make all such changes as fairly fall within the scope of the following claim.

As an improved article of manufacture a plate for use in a step ladder', the said plate embodying in a single integral element a body portion having a rung-receiving flange forming a socket, a. lug projecting in the plane of the plate and having a rod-receiving opening, and a lug projecting laterally from the back of said plate to engage in an j opening in the upright of the ladder, the last-named lug being disposedeccentrically with respect to the centre of said socket.

THOMAS THOMPSON.

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