US1445848A - Extensicn ladder - Google Patents

Description

J. H. RIDINGS. EXTENSION LADDER.

FILED JULY 2|.1920.

ldatentetll El i, flhlfitti.

J'QHN HJENEY RIDINGS, 0F GOAL CITY, ILLINOIS;

EXTENSION LADDEB.

.Apphcationfiled July 21, 1920. Serial Nb. 393,017.

To all whom it may amaze m Be it known that l. iloirn' l mos a citizen of the United than residing); at

Coal City. in the county or"? Grundy and 5 Fitate oi .illinois have invei'itcd certain neu and. useful lln'i.provements in Extension Lad ders. of which the following is a specifics tion.

My invention relates to improvements in 10 extension ladders. and more particularly to the consatruction. mounting: and general orrangement ot the round engaging members or hooks pii'otally carried by the extension ladder. section. and adapted to swing in plane at right angles to the longiritudinal plane of therounds oi the stationary ladder section.

The primary obiect ot' the invention is to provide a generally improved mounting: tor the roundengaging member or hook for use in connection with extension ladders, which will be exceedingly simple in construction, cheap oi manufacture, and eliicient in use.

With the above mentioned and other ends in View, the invention consists in the novel constructiom arrangement. and combination of parts. hereinafter described. illustrated in one of its embodiments in the accompany- 0 i119; drawings. and particularly pointed out I in the appended claim.

Referring to the drai-vings forming: a part of this specification. Figure 1 is a perspcc tive view of the improved extension ladder with the round en agingr member in detached 'iosition prep ratory tocxtending' or elevating the extension ladder section.

Fig. 2, a side elevation of one of the round. engaging members or hooks detached. i

Fig. 3, an enlarged rear elevation ot the same, the "bearings and attaching); bracket elements being shown in section and disassembled.

Fig. 4C, a fragmentary longitudinal sectional view of the adjacent ladder section and illustrating the open or detached positions of the round engaging members in movingor adjusting; the movable or extension ladder section relatively to the lower or stationary ladder section.

Fig. 5, a similar View, illustrating the relative position of the parts in lowering the extension ladder section and particu larly shov'vin the hooks closed. by the rune] in tan-china over an adjacent round of the stationary ladder section.

Fig. 6, a similar View, illustrating the round engaging position of the hooks.

Similar numerals of reference designate like parts thruout all the figures ot the draw ings. o

The improved ladder comprises a relatively fixedor stationary ladder section 1. and a relatively movable or extension ladder section 2. i

The ladder sections 1 and 2 comprise the usual side members provided with the usual rounds 1 and 2*. respectively.

The side members of the extension section 2, are mounted Within the side bars ot the stationary section in the usual manner; and are guided at their upper ends by means of guide members or clips 3.

The extension section 2 may be extended and retracted in any suitable and convenient manner, as for example.-by means or a cable t connected to one of the rounds ot the extension section and extending upwardly and over apulley 5 of the stationary section and returning downwardly Within easy reach of an operator from the base of thestationary section.

Referring now to the improved round" e11- gaging members or hooks and the improved method of mounting the same to which this invention particularly relates. it u-illbe seen that the round engaging hooks or members are arranged in pairs on the inner sides of the side bars of the movable or extension section. and in view of the tact that. such hooks or members are duplicates of each other and operate simultaneously a detailed description ct one Will describe the other.

The round engaging member comprises a main body portion 6, terminating at one end in a bearing head 6 having an openingto receive and take over the bearing" head 7 of a bracket member 7, detachably secured to the inner side ofthe adjacent side bar of the ladder by means of attaching screws 7*. As a means of removably securing the bearing head 6*, 0f the pivoted round engaging; member, a bolt 7 is removably mounted in the bearing head 7 of the bracket 7, and is connected at its inner end by means of a nut 7 a Washer 7 being inounted beneath the not 7 to retain the hook engaging member in position.

The was; engatg ing members d swing llltl freely on the bearing heads 7 of the bracket 7, and depend therefrom.

Each round engaging member is provided at its lower end with spaced projections forming round engaging stop and hook members 6 and 6 spaced apart forming a guideway adapted to receive and contain one of the rounds l of the stationary ladder section 1, the rear inclined arm of the round engaging member being inclined to successively pass over and be reciprocated by the rounds of the stationary ladder section when elevated as indicated in Fig. l of the drawings.

As a means of initially closing the hook member 6 when it is desired to elevate and detach the latter from the rounds of. the lower section 1 when in engaged position as shown in Fig. 6, and when the hook is raised upwardly by the elevation of the extension section 2 to a position substantially as shown in Fig. 4: and whereby upon the return of the extension section as illustrated substantially in Fig. 5, the hook 6 will successively be closed as the upper or extension section 2 is moved downwardly, the curved stop member 6 is provided with a hook closure runner member 8 pivotally connected by means of a pivot pin 8 extendingthru side bearing lugs 8 of the runner member, said runner member being curved as shown and having its tip 8 adapted to engage and close the hook member 6, so that when the extension section is lowered from the position shown inFig. l toward the position shown in Fig. 5 the tip of the run ner member 8 will engage with the adjacent lower round of the stationary ladder section and swing the round engaging member outwardly to pass over the round, as illustrated in Fig. 5.

lVhen the extension ladder section 2 moved upwardly from engagement with. one round of the stationary ladder section to another or successively higher round, the round engaging members will be rocked on pivots and successively pass over the rounds as will be obvious upon reference to Fig. l.

Should it be desired to engage one or the rounds of the lower or stationary section to secure the upper or extension section in position, said extension section 2 may be given an initial elevating movement sutlicient to allow the rear side of the round.

engaging inen'iber to ride over the adjacent. round and the tip ol the hook member to clear the round oi the stationary memer or ladder section, whereupon a slighi retracting movement or? the extension ladder section will cause the hook ('r to engage with the rounds as shown in Fig. l of the drawings.

It will be seen that the stop and hook members (5" and 6 limit and routine the movements oli the round ci'igaging members. and that the hook closure runner member.- 8 act to automatically close the books (3 and. prevent their eng ging with the sili-ccssivr rounds oi? the stationary sections as the upper section 2 is returned over the lower Sec-- tion, such members forming runner members so that the same will ride over the successive rounds transmitting a Hull] i' ::1l1o;' movement to the round engaging members as a whole until the desired adjusted position oi? the extension section is reached. whereupon the same may he moved to ramthe hook members (3 to engage with the rounds oi the stationary ladder section in the manner hcreinbeiore described.

Having thus described one of the embodiments of my invention, without having attempted to set forth all the forms in which it may be made or all the modes of its use. what I claim and desire to secure by Letters Patent, is,

in a mounting for extension ladder round engaging hooks, an attaching bracket adapted to be secured to the inner side. of one of the rails of the adjacent extension ladder section and provided with a bearing head having a bolt receiving opening extending axially thereiihrough said opening being onlargedon the rail-engaging side ol said attaching bracket, :1. bolt extending through said opening and having a head sealed in said enlarged portion of the opening and covered by said attardiing bracket when the latter is mounted. a round engaging member having a bearing head. pivoted on said hearing head of said bracket, and a Fastening element detachabl secured to the inner end of said bolt and bearing against saidbear ing head oli said round engaging member. In testimony whereof I have uilixed my signature.

JOHN H lQNlt if RIDING S.

Iii)

Images