US910188A - Extension-ladder. - Google Patents

Description

M. M. FLOYD.

EXTENSION LADDER.

APPLIOATION FILED 23.15, 1908.

Patented Jan. 19, 1909.

UNTE s'rn'r MILTON M. FLOYD, OF GREENVILLE, ILLINOIS.

EXTENSION-LADDER.

T 0 all whom it may concern:

Be it known that I, MILTON M. FLOYD, a citizen of the United States, residing at Greenville, in the county of Bond and State of Illinois, have invented certain new and useful Improvements in Extension-Ladders, of which the following is a specification.

This invention relates to extension ladders, the object being to provide a ladder which is so constructed that the extensible section will be automatically supported in its adjusted position.

Another object of my invention is to provide a supporting member which will support the extensible section rigidly, and at the same time have the tendency to bring the two sections together, whereby the two sections will be held in their proper position, without any danger of them moving.

Another object of my invention is to provide novel means for limiting the outward movement of the supporting member, whereby it will be prevented from being thrown outwardly by the extensible section when being drawn upwardly.

These objects are obtained by the novel arrangement and construction of parts hereinafter fully described and shown in the accompanying drawings, in which Figure l, is a'perspective view of my improved ladder. Fig. 2, is a side elevation of the same, and, Fig. 3, is a section taken on line 3-3 of Fig. 2.

In the drawings A, indicates the base section, comprising the uprights 1-l and a single set of rungs 2. The uprights 11 are provided with guide brackets B, adjacent to their upper ends. These extend outwardly from the edges of the side bars or uprights flush with the inner side of the same, and between them and the uprights 11 is slidably mounted an extensible section C comprising the uprights 3-3 and rungs 4:. The upper section is held in place between the members 11, BB by a U-shaped cross bar D, secured to the uprights 11 and is operated by a cable which is connected to its lower rung and passes over a pulley E, carried by the rung A, of the base section A, and by means of which the extensible section is raised when desired, as will be hereinafter fully described.

Bearing plates F, are secured to the side bars of the section A, and extend outwardly, and have their free ends connected to the brackets B, and in which are mounted the Specification of Letters Patent.

Application filed February 18, 1908.

Patented Jan. 19, 1909.

Serial No. 416,542.

outwardly extending journal arms G and G of a U shaped supporting frame Gr, which is adapted to extend between the rungs of the ladder sections and support the extensible section. The bearing plates are slightly above the rung A, upon which the frame G, is adapted to rest, whereby the side bars of the frame will be slightly inclined, so that when it is engaged by one of the rungs of the extensible section, and weight is brought on the same, it will have the tendency to draw the extensible section tightly down on the base section.

The plates F comprise a portion 5 secured to the outer faces of the uprights l1, and elf set portion (5 at right angles thereto which is securely fastened to the front face of the uprights and the bearing portion 7 extending outwardly in a plane parallel with the portion 5.

The journal arms G and G form braces for the side bars of the extensible section C, whereby when the ladder is placed against a building, and a weight is placed on the same, the side bars will be forced outwardly against the journal arms, which will prevent the section from giving and hold it rigidly in position.

The frame G, acts as a gravity pawl, as the extensible section is moved upwardly, and to prevent the frame from being swung outwardly too far by coming into contact with the rungs of the extensible section, I provide the journal arm G with an angle end G which engages the portion 6 of the plate F on the side bar of the base section, and forms a stop for the frame.

In order to be able to operate the supporting frame from the ground, I form the journal arm G, with a lever G, to which is connected a cable, whereby the frame can be held out of the path of the rungs of the extensible section, so that it can be readily lowered when desired.

From the foregoing description it will be seen that I have provided an extension ladder formed of two sections, one sliding upon the other in such a manner that it will be held in its proper position at all times and under all conditions, thereby overcoming the difliculties now existing with ladders of this character now in use.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is An extension ladder comprising a base section formed of a pair of uprights and a ing off set portions secured to the base secsingle set of rungs in combination with an tion, a frame journaled in said plates and 15 extensible section formed of a pair of upprovided with a stop for engaging one of rights and rungs, said extensible section besaid off set portions for limiting the outward 5 ing slightly narrower and arranged between movement of said frame substantially as the uprights of the base section which form described. guide ways for the same brackets fixed to In testimony whereof I have signed my 20 the front edges of said uprights and having name to this specification in the presence of their inner faces in a plane with the inner two subscribing witnesses.

10 faces of said uprights, a U-shaped cross bar MILTON lvI. FLOYD.

fixed to the uprights of the base portion and Witnesses: M holding the extensible section in position, M. H. DAWDY,

bearing plates fixed to said bracket and hav- Roxns PERKINS.

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