US856875A - Extension-ladder. - Google Patents

Description

No. 856,8 75. PATENTED JUNE 11, 1901. B. HUGHES & H. N. YOUNG.

EXTENSION LADDER.

APPLICATION FILED APB. 8,1908.

\X/I N EEEES. INVENTU 5 m. I Z WH g rs' m 3AM ATTURNEY UNITED STATES PATENT @FFliGE.

BENJAMIN HUGHES, OF MONTREAL, AND HERBERT NOEL YOUNG, OF ROCKFIELD, QUEBEC, CANADA, ASSIGNORS TO G. ALFRED MORRIS, OF

MONTREAL, CANADA.

EXTENSlON-LADDER.

Specification of Letters Patent.

Patented June 11, 1907.

Application filed April 9,1906. Serial N0- 310,793.

.To all whom it Til/(Ly concern- Be it known that we, BENJAMINHUGHES and HERBERT NOEL YOUNG, subjects of the King of England, and residing at Montreal and Rockfield, respectively, in the Province of Quebec, in the Dominion of Canada, 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 of the invention being to produce a ladder of that class which may be easily and quickly raised and lowered when desired, and which will possess means for securely locking the slidable section in any desired position, there being also provided attachments designed to reinforce the structure and to lessen friction in the operation thereof, all as hereinafter more fully described and specifically pointed out in the claims.

in the accompanying drawings similar let ters of reference and characters of reference denote corresponding arts in all the views.

Figure 1 is a front e evational view of the ladder partly extended; Fig. 2 is a side eleva tional view, with part of one of the side rails broken away; Fig. 3 is a rear elevation of one of the hooks and its integral sleeve; Fig.4 is a side elevational view of the same art; Fig. 5 is a rear elevational view of the ever sleeve and lever; Fig. 6 is a side elevational view of the same part Fig. 7 is a top plan view of one of the castings which are attached to the upper ends of the side rails of the base section of the ladder; Fig. 8 is a side elevational view of the same part; Fig. 9 is a side elevational view of one of the castings attached to the lower end of the side rails of the base section of the ladder and Fig. 10 is a top plan view of the same member.

Referring to the parts -A is the base section of the ladder, B is the slidable section of the same, C- is a sheave which is attached by any suitable means to one of the rungs d, preferably the top rung, of the base section, and E is the manipulating rope or cable by means of which the slidable section is raised.

Upon the rung e of the base section are placed a plurality of sleeves -1 2 respectively, and to the sleeves 1 are cast the hooks 3- there being also counter Weights 4: cast integral therewith, said counterweight-s being adapted to hang as the s idable section of the ladder when it is lowered, but there is a lever 5- cast integral with the sleeve 2 and said lever -5 islong enough to extend into the path of travel of said rungs so as to be impinged thereby in ascending and descending.

Each of the sleeves 1 and 2- is provided with shoulders 6 as shown best in Figs. 3 and 5, and said shoulders are so positioned when the-slecves are in position on said rung that the lever 5- may be thrown upwardly without disturbance of the hooks, but in the event of the lever -5- remaining on the lower side of any given rung of the slidable section while the hook is also on the lower side of the same rung, which shall be considered the nearest rung, then said shoulders will become interlocked in such manner as to retract the hooks -3- when the said rung will impinge the lever 5 and it will be evident that the extension, or upper section, may now be lowered to the-ground.

If it is desired to lock the slidable section at any point all that is necessary is to raise the slidable section to such position that the lever 5 and the adjacent hooks 3 are on opposite sides top and bottomof the adjacent rung oi the ladder as shown in Fig. 2 so as to carry the engaging shoulders -6 out of operative position, whereupon the ladder will be locked in position as soon 'as the 11 per section is lowered to permit the rung a ove said hooks to rest upon the hooks.

By making the hooks and lever integral with said sleeves it is evident that they may be supported by one of the rungs of the ladder and no extra means of attachment are required.

At the lower end of the slidable section -B- and at the upper end of the fixed base section A are provided castings 7- and -8- res )ectively, said castings being substantially alike in general form. Each of these castings carries a pair of friction reducing rollers 9- which are so disposed as to be at o posite sides of the slidable ladder section, t c said slidablc section floating between said rollers in use, and integral with each of these castings -7 8 are cheekpieces 1(l which are perforated for the passage therethrough of one of the rungs, as -d to hold said castings in position,

there being also perforated flanges "11 formed integral with said castings so that bolts 12 may be passed therethrough for the purpose of assistingto hold said castings in position to carry the friction reducing rollers before referred to.

When the castings are used' it is evident that no boring of the side rails is re uired to the rollers 4 which may rest against the wall of the buildingwhile the extension is being raised, and foot castings 15 are secured to the lower ends of the base section with spiked extensions cast thereon which are adapted to engage with the surface on which the ladder rests, though it is evident that instead of the spikes there may be foot pieces of rubber or other yielding material substituted if desired.

' Having described our invention, what We claim as new is:

1. In an extension ladder comprising a base section and a slidable section, the combination with a shouldered sleeve carrying a counterbalanced book, a shouldered sleeve carrying a lever and means for elevating said. slidable section.

2. In an extension ladder comprising a base section and a slidable section, the combination with a shouldered sleeve carrying a counterbalanced hook, an intermediate shouldered sleeve carryin an integral lever,

means for elevating sai slidable section, guide rollers at opposite sides of said slidable section, a casting supporting said rollers and seems base section and a slidable section, the com- I bination of a rockable shouldered sleeve carrying an integral hook at each of the ends of and rotatable on a rung of said ladder, and an intermediate shouldered sleeve on said rung and carrying an integral lever adapted to engage said hook carrying sleeves at predetermined times.

5. In an extension ladder, a base section with rungs, a slidable section with rungs, interlockable sleeves (in-opposite end portions of one rung of the base section, a hook integral with said sleeves and a'throw ofl lever integral with an intermediate sleeve, there being shoulderson said intermediate sleeve adapted to engage said interlockable sleeves at predetermined times.

6. In an extension ladder, the combination comprising a base section, a slidable section, rockable and shouldered sleeves carried by one rung of said base section, hooks interal with some of said sleeves, a: throw off ever integral with an adjacent sleeve carried on the same rung and shoulders on said lever sleeve adapted to engage thehook carrying sleeve. 1

In witness whereof We haye hereunto set our hands in the presenceof two witnesses.

BENJAMIN HUGHES. HERBERT NOEL YOUNG. Witnesses:

F. H. GIBBS, E. Huenns'.

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