US2459621A

US2459621A - Hoisting attachment for ladders

Info

Publication number: US2459621A
Application number: US602528A
Authority: US
Inventors: Charles L Cobb
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-06-30
Filing date: 1945-06-30
Publication date: 1949-01-18
Anticipated expiration: 1966-01-18

Description

Jan. 18, 1949. B 2,459,621

HOISTING ATTACHMENT FOR LADDERS Filed June so, 1945 IN VENT OR fhazzles' L. Cobb W I A TTORNE Y Patented Jan. 18, 1949 UNITED HOISTING ATTACHMENT FOR LADDERS Charles L; Cobb, Los Angeles, Calif.

Application June 30, 1945, Serial No. 602,528

4 Claims. (01. 248-2 My invention relates to hoisting attachments for ladders by which materials used in constructing and repairing the roofs of buildings can be hoisted to the roof through the use of a ladder of conventional construction.

It is a purpose of my invention'to provide a hoisting attachment for ladders, which is characterized by its structural simplicity and low cost of manufacture; its easy mode of attachment and detachment to and from a ladder; and its ability when attached, to secure itself against accidental detachment without the use and manipulation of screws, bolts, nuts, clamps, and the like.

I willdescribe only one form of hoisting attachment for ladders embodying my invention and will then point out the novel features thereof in claims.

In the accompanying drawings:

Fig. 1 is a view showing in vertical section one form of hoisting attachment embodying my invention in applied position to a ladder, and the ladder moved away from the side of a building to illustrate how the attachment is used in the hoisting of a bucket to the roof of the building.

Fig. 2 is a view showing the hoisting attachment in side elevation and applied to a ladder.

Fig. 3 is a view similar to Fig. 1 showing the position of the attachment and the ladder when no material is being hoisted by the attachment.

Fig. 4 is an enlarged perspective view of the hoisting attachment.

Referring specifically to the drawings in which similar reference characters refer to similar parts in each of the views, my invention in this embodiment comprises a frame designated generally at F which may be made of a single length of steel tubing bent medially of its ends to form a pair of parallel spaced legs [5 of equal length, and an upper connecting or bridge portion l6 preferably of bight form.

Welded or otherwise secured to the same side of the legs and arranged in pairs one beside the other, are brackets B for attaching the frame to the rungs of a ladder. These brackets are identical in construction, and each comprises two arms I! and I8 constructed from a single piece of metal and arranged at right angles to each other.

In each instance the arm I l at its free end edge is cupped to conform to the rounded contour of the leg l5, and welded to the leg at this point so that the arm is perpendicular to the leg, while the arm 18 is parallel to the leg. Such mode of fixing the bracket to the leg is supplemented by a metal web I9 which is shaped at its inner edge to have continuous contact with the outer sides of both arms n and"), as well as the leg is, It is at this edge that the web is welded to the arms and leg, thereby reinforcing the bracket against bending, and providing additional securing means for the arm ll. 1 v

The foregoing described construction of bracket B is for use with ladders having rungs of square or rectangular form in cross section, but it will be understood that the brackets can be modified to render them applicable to ladder rungs of circular cross section.

To provide means for swivelly suspending from the upper end l6 of the frame F, a conventional pulley P with its accompanying rope R, a cross member 20 inthe form of a metal rod reinforced by a web 2|, is welded to the legs l6 adjacent the frame end l6. From this member 20 the hook 22 of a clevis 23 for the pulley P may be suspended to positionthe pulley between the legs I5, as illustrated.

My hoisting attachment is applied to the rungs 24 of a ladder by positioning the frame above and at one side of the ladder so that the legs I5 are between the side rails 25 of the ladder, while the brackets B are above the two uppermost rungs. That is to say, the brackets of the upper pair are above the uppermost rung while the brackets of the lower pair are just above the next rung below. With the attachment so positioned it will be clear that by lowering the frame F the brackets B are caused to embrace the two uppermost ladder rungs, and to thereby securely hold the frame on the ladder against both downward movement and lateral movement. The pulley P may now be applied to the cross member 20 so that the pulley is suspended from the frame at a point above the uppermost ladder rung with the rope R extended to opposite sides of the ladder, as illustrated.

In use of the attachment, any roofing material may be attached to one end of the rope such, for example, as the bucket K (Fig. 1), while the other end of the rope extends to the ground for manipulation to hoist the bucket K upwardly to the top of the building indicated at D in Fig. 1. In order that such hoisting of material may be "effected it is necessary for the roofer on the top of the building to move the ladder and the attachment away from the parapet D of the building, in the manner illustrated in Fig. 1. By such positioning of the attachment and the ladder the bucket K can be hoisted between the side of the building and the ladder and up to a point within reach of the roofer on the parapet.

When the attachment is not in use it does interfere with the normal use of the ladder as it can rest against the parapet, as illustrated in Fig. 3, to be used for reaching and leaving the building roof. To detach the attachment from the ladder it is only necessary to elevate the frame F until the brackets B disengage the rungs, and this can be done upon moving the ladder to the position shown in Fig. 1.

Although I have herein shown and described only one-form oflhoisting attachment and ladder embodying; my l lnventicn; it is to b understood that various changes and modifications may be made therein without departing from the spirit and scope of the of my invention and the spirit appended claims.

I claim:

1. A hoisting attachment for naaei-s, includ-' ing: a frame of inverted u-rerm';z'-a pluralityof f rung-engaging brackets fixed to the parallel porm-parallelism, a handle at one end of said legs, and a cross member between said legs and spaced tions of said frame for supporting saidfra'me on the upper end of a ladder when it is substantial- 13* vertical; and withits" bight portion above said upper-end; and meanson the bi'ght portio'n of said frame" affording means "-fro'rn which a pulley may be suspended between said parallel portions.

2 A hoisting attachment for ladders-includingi-a'irame of-inverted -U-'form; and'bra'ckets fixed-to the-parallel portions ofsaid "frame; and so const'ructed and arrangedas to 'embrace 'at least two rungs of a ias-demo support said frame in a plane parallel -to and extended upwardly from the upper end of a ladderwlien the latter is substantially vertical; 39A hoisting attachment for ladders; includin gz-a pair oflegs fixedly'cennected to each other at one of their ends and otherwise spaced-apart substantiall in parallelisma distance to' be recross In rromisaidcandle; and providing means from which a pulley can be suspended between the "legs; and brackets on said legs for attaching said irame:tov'a ladder so that said handle and said 7 4 ember are positioned beyond one end of theladder. 7

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