US3074508A

US3074508A - Ladder hoist

Info

Publication number: US3074508A
Application number: US65850A
Authority: US
Inventors: William F Book
Original assignee: Individual
Current assignee: Individual
Priority date: 1960-10-28
Filing date: 1960-10-28
Publication date: 1963-01-22
Anticipated expiration: 1980-01-22

Description

Jan. 22, 1963 I w. BOOK 3,074,508

LADDER HOIST Filed Oct. 28, 1960 2 Sheets-Sheet 1 FIG. 1

lv 88 ii 44 f 44 5% f M INV EN TOR. W/LL 64M I? 50046,

Arrive/vars,-

3,074,508 LADDER HOIST William F. Book, 936 SW. 49th St, Oklahoma City, {)lria. Filed Oct. 28, 196i Ser. No. 65,859 (lit-rims. (Cl. 182-129) This invention relates to a novel ladder hoist.

The primary object of the invention is the provision of a more efiicient, safer, and versatile ladder hoist which can be adjusted to position its sheave close to or spaced away from a ladder upon which the hoist is mounted.

Another object of the invention is the provision of a hoist of the character indicated above whose mounting means extends away from the ladder at an outward and upward angle, so that the foot of the ladder is forced against the ground and the head of the ladder is forced against a roof eave or the like, in a manner to resist slipping and tipping of the ladder during use of the hoist.

A further object of the invention is the provision of a hoist of the character indicated above which is adapted to be mounted on and between a pair of ladders positioned in spaced side-by-side relationship.

A still further object of the invention is the provision of a hoist of the character indicated above, which has rigid mounting means, on which is pivoted hoist sheave carrying means, the sheave carrying means being adapted to be pivoted, through a complete circle or 360, to put the sheave close to and spaced away from and on a level with or above or below the roof or the like, and novel means for releasably locking the carrying means in selected pivoted positions.

Other important objects and advantageous features of the invention will be apparent from the following description and the accompanying drawings, wherein, for purposes of illustration only, a specific form of the invention is set forth in detail.

In the drawings:

FIGURE 1 is a contracted top plan view of a hoist of the present invention;

FIGURE 2 is a contracted front elevation of said hoist, showing the same mounted on and extending between a pair of ladders, and carrying a hoist sheave and cable;

FIGURE 3 is a side elevation of FIGURE 2; and

FIGURE 4 is a fragmentary exploded vertical longitudinal section, on an enlarged scale, taken on the line 4-4 of FIGURE 3.

Referring in detail to the drawings, wherein like numerals designate like parts throughout the several views, the illustrated hoist, generally designated 16', comprises a pair of similar but reversed, laterally spaced

mounting brackets

12 and 14, on and between which is pivotally supported a hoist sheave carrier 16. The

brackets

12 and 14 comprise vertically spaced, upwardly converging and intersecting straight upper and lower arms 18 and 26, respectively, the lower or second arm 20 being substantially longer than the upper or first arm 18, the upper end of the upper arm being suitably fixed, as indicated at 22, to the lower arm 26, at a point spaced below the upper end of the lower arm.

Fixed to and extending at opposite sides of the lower end of the upper bracket arm 18 is a horizontally elongated ladder rung grip 24 which is a C-shaped, downwardly opening channel. The grip 24 comprises a horizontal web 26 which merges, at its ends, into opposed arcuate concave outer and inner side walls 28 and 30, respectively, which are spaced from each other at a distance greater than the width of a ladder rung and are shaped to conformably grip a ladder rung, as shown in FIGURE 3. The lower edges of the side walls are spaced from each other to provide a longitudinal access slot 32 which is preferably no wider than necessary to freely pass a ladder rung into the grip 24.

3,674,588 Patented Jan. 22, 1963 Fixed to and extending at opposite sides of the lower end of the lower bracket arm 2%), is a horizontally elongated U-shaped laterally inwardly opening channel ladder rung engager 34, having an arcuate vertical web 36 and parallel spaced upper and lower flanges 38 and 40, respectively. The flanges 38 and 40 are preferably spaced from each other at a distance no greater than necessary to freely accept a ladder rung therebetween, as shown in FIGURE 3.

'On the upper ends of the lower bracket arms 20 are suitably fixed, as indicated at 42, preferably cylindrical transversely extending horizontal solid heads 44 having outer ends 46. As is shown in FIGURE 4, the heads 44 have axial bores extending therethrough which are composed of threaded outer portions 5% and smooth walled inner portions 52, which are larger in diameter than the outer portions 59. On the inner ends of the heads are fixed concentric, enlarged diameter flat circular female locking plates 54 which have circumferentially spaced holes 56 extending therearound.

The hoist sheave carrier 16 comprises a U-shaped rigid form, preferably of tubing or pipe, having a straight bight portion 53, on whose ends are straight legs 69 disposed at right angles to the bight portion, and having cylindrical transversely extending horizontal hollow heads 62, suitably fixed therein, as indicated at 64. The heads 62 have sidewalls 66 and outer end walls 68 provided with axial openings 7% therethrough. The inner ends of the heads 62 are closed by concentric enlarged diameter circular male locking plates 72, which are also fixed to the inner sides of the legs 60, as indicated at 74. The male looking plates 72 have locking pins 76, or substantially the same diameter as, and located on the male locking plates to be selectively engaged in holes 56 of the female locking plates 54, in selected pivotally adjusted positions of the carrier 16 relative to the

mounting brackets

12 and 14.

The carrier 16 extends between the

mounting brackets

12 and 14 and is pivotally supported thereon by means of pivot bolts 80, whose shanks have smooth outer portions 82 and threaded inner portions 84. Enlarged diameter heads 86 having handles 88 are provided on the outer ends of the bolt shanks, to bear against the outer sides of the outer end walls 68 of the hollow heads 62, and collars 9t) spaced inwardly from the bolt heads 86,, which engage the inner sides of the end walls 68, to prevent outward displacement of the bolts 80, relative to the hollow heads 62. The male locking plates 72 have smooth axial openings 92 through which the shanks of the bolts 86 extend inwardly beyond the male locking plates 72.

The threaded innner portions 84 of the bolts 86 are removably engaged through the inner smooth portions 52 and are threaded in the threaded outer bore portions 59 of the solid heads 44 on the

brackets

12 and 14, with looking pins 76 engaged in selected holes 56 in the female locking plates and the locking plates engaged with each other, whereby the carrier 16 is held in adjusted relationship to and is rigidly connected to the

mounting brackets

12 and 14.

When it is desired to change the angle of the carrier 16 relative to the

brackets

12 and 14, the handles 88 are used to rotate the bolts so as to thread the same out of the threaded bore portions 50 of the bracket heads 44, so that the brackets can be shifted outwardly away from the carrier, far enough to put the ends of the bolts in the smooth bore portions 52 of the bracket heads 44, so that the male locking pins 76 are disengaged from the female locking plate holes 56, and the carrier can be pivoted to a desired angular position. It is to be noted that the smooth bore portions 52 of the bracket heads 44 serve as journals for the bolts 84 while the bolts are threaded out of the threaded bore portions 59, whereby the carrier 16 remains supported on the

mounting brackets

12 and 14 while an adjustment of the carriers rotary position is being made. With the carrier 16 held in the new position, the bolts are threaded into the threaded bore portions 50, at the same time that the locking pins 76" are engagedin holes 56 in the female locking plates 54; the bolts 80 being turned until the male and female locking plates come together.

The hoist further comprises a hoist sheave 94, over which is trained ahoist cable or rope 96, the sheave having a hook 98 which is engaged'through an opening 100 in the lower end'of a pendent ear 102 which is fixed to a sleeve 104"whichis journaled centrally on the'bight portion of the carrier 16, between two positioning-collars 106;

As shown in FIGURES lto 3, the hoist 10 is adapted to be installed on two laterally adjacent ladders L which are supported on the ground and angled inwardly into engagement with the edge-of the cave of a-roof R. The ladder rung-grips 24 are first engaged over selected ladder rungs 108, and theladder rung engagers then engaged with ladder rungs below that engaged by the grips 24. The desired angle ofthe-carrier 16 relative to thebrackets l2 and 14, if not already selected, is then obtained as hereinabove described, whereat the sheave 94is. hooked into the eye 102, and the hoist is ready for a hoisting operation.

It is to be noted that the ladder rung grips 24 and the engagers 34 occupy the major part of the lengths of the ladder rungs 108, between the ladder rails 110, so that movements of the ladders L toward and away from each other are safely limited by engagements of the ends of the grips andv the engagers with the rails 110, should such lifting of the ladders. develop during use of the hoist 10.

Further, the upwardly and outwardly angled relationships of the

brackets

12 and 14 to the ladders L, as shown in FIGURE 3., putsthe center of downward stress on the hoist, in hoisting operations, at the locations of the upper ends of the brackets, at points displaced" outwardly and upwardly relative to the points of bearing ofthe brackets on the ladders, so that a desirable eiiect of pushing the ladders down on the ground and against the cave of the roof R is obtained, which resists sliding of the feet of the ladders even on relatively slippery surfaces, such as smooth concrete.

It is to be understood that while the hoist 10 has been disclosed asbeing proportioned for and associated with two ladders L, the hoist can be proportioned in width for use and mounting upon a single ladder.

Although there has been shown and described a preferred form of the invention, it is to be understood that the invention is not necessaFily confined thereto, and that any change or changes in the structure of and in the relative arrangements of components thereof are contemplated as being within the scope of the invention as defined by the claims appended hereto.

What is claimed is:

1. In combination, a pair of'ladders having verically spaced rungs and .side rails, a hoist comprising a pair of brackets having upper and lower members supportably engaged on vertically spaced rungs of the ladders, a hoist sheave carrier extending between the brackets and pivoted on a horizontal axis on the brackets, locking means for holdingthe carrier in selected rotated relationship to the brackets, the pivot axis of the carrier being disposed upwardly and outwardly relative to said upper and lower members, said carrierbeing U-shaped and having a horizontal bight portion having hoist sheave supporting means thereon, and legs having free ends, horizontal axis locking plates on said free ends, said brackets having horizontal axis locking plates thereon, pivot bolts extendingthrough the locking plates of the carrier legs and of the brackets, said bolts being freely rotatable in locking plates and threaded in other locking plates, circumferential holes in locking plates, and locking pins on other locking plates removably engaged in holes.

2. In combination, a pair of laterally spaced ladders having side rails and vertically spaced rungs, a hoist comprising a pair of laterally spaced mounting brackets having upper and lower members severally and supportably engaged with vertically spaced rungsv between railsof the ladders, said brackets extending'upwardly and outwardly from the ladders and having upper ends, a U- shaped hoist sheave carrier having a bight portion and legs having free ends, said carrier being positioned between said brackets with the free ends of its legs pivoted on horizontal axes on the upper'ends of the brackets, and locking means forlocking the carrier in a rotated position on the brackets;

3. In combination, a pair of laterally spaced ladders having side rails and vertically spaced rungs, a hoist com.-. prising a pair of laterally spaced mountingbrackets having upper and lower members severally and supportably engaged'with vertically spaced rungs between rails of the ladders, said brackets extending upwardly and outwardly from the ladders and having upper ends, a U-shaped hoist sheave carrier having a bight portion and legs having free ends, said carrier being positioned between said brackets with the free ends of its legs pivoted on horizontal axes on the upper ends of the brackets, and locking means for locking the carrier -in a rotated position on the brackets, the carrier being rotatable relative to the brackets through 360.

4. In combination, a pair of laterally spaced ladders having side rails and vertically spaced rungs, a hoist comprising a pair of laterally spaced mounting brackets having upper and lower members severally and supportably engaged with vertically spaced rungs between rails of the ladders, said brackets extending upwardly and outwardly from the ladders and having upper ends, a U-shaped hoist sheave carrier having a bight portion and legs having free ends, said carrier being positioned between said brackets with the free ends of its legs pivoted on horizontal axes on the upper ends of the, brackets, and locking means for locking the carrier in a rotated position on the brackets, and hoist sheave connecting means journaled on said bight portion 5. A hoist comprising a pair of laterally spaced ladders located in a vertical plane and having side rails and vertically spaced rungs, brackets mounted on and projecting out of the plane of the ladders, a U-shaped sheave carrier comprising a cross member extending between the ladders and legs having free ends, means pivoting the free ends of the legs on the brackets on a horizontal axis extending parallel to the plane of the ladders, sheave connecting means on said cross member, locking means for locking the sheave carrier in selected rotated positions relative to the ladders.

References Cited in the file of this patent UNITED STATES PATENTS

Claims

1. IN COMBINATION, A PAIR OF LADDERS HAVING VERTICALLY SPACED RUNGS AND SIDE RAILS, A HOIST COMPRISING A PAIR OF BRACKETS HAVING UPPER AND LOWER MEMBERS SUPPORTABLY ENGAGED ON VERTICALLY SPACED RUNGS OF THE LADDERS, A HOIST SHEAVE CARRIER EXTENDING BETWEEN THE BRACKETS AND PIVOTED ON A HORIZONTAL AXIS ON THE BRACKETS, LOCKING MEANS FOR HOLDING THE CARRIER IN SELECTED ROTATED RELATIONSHIP TO THE BRACKETS, THE PIVOT AXIS OF THE CARRIER BEING DISPOSED UPWARDLY AND OUTWARDLY RELATIVE TO SAID UPPER AND LOWER MEMBERS, SAID CARRIER BEING U-SHAPED AND HAVING A HORIZONTAL BIGHT PORTION HAVING HOIST SHEAVE SUPPORTING MEANS THEREON, AND LEGS HAVING FREE ENDS, HORIZONTAL AXIS LOCKING PLATES ON SAID FREE ENDS, SAID BRACKETS HAVING HORIZONTAL AXIS LOCKING PLATES THEREON, PIVOT BOLTS EXTENDING THROUGH THE LOCKING PLATES OF THE CARRIER LEGS AND OF THE BRACKETS, SAID BOLTS BEING FREELY ROTATABLE IN LOCKING PLATES AND THREADED IN OTHER LOCKING PLATES, CIRCUMFERENTIAL HOLES IN LOCKING PLATES, AND LOCKING PINS ON OTHER LOCKING PLATES REMOVABLY ENGAGED IN HOLES.