US3743227A

US3743227A - Ladder supported hoist

Info

Publication number: US3743227A
Application number: US00171823A
Authority: US
Inventors: J Sowery
Original assignee: Individual
Current assignee: Individual
Priority date: 1971-08-16
Filing date: 1971-08-16
Publication date: 1973-07-03
Anticipated expiration: 1990-07-03

Abstract

An elongated ladder engaging standard is connected in angular relation to one end to one end of an arm and a brace interconnected with the other end portions of the standard and arm, forms an A-frame hoist. Socket means on the standard releasably engage ladder rungs in hoist supporting relation. Tackle means on the outwardly projecting end of the arm completes the hoist.

Description

United States Patent [1 1 Sowery 1 LADDER SUPPORTED HOIST [76] lnventor: Jack S. Sowery, 927 West Main,

Troy, Ohio 45373 [22] Filed: Aug. 16, 1971 [21] Appl. No.: 171,823

[52] US. Cl. 248/210 [51] Int. Cl. E06c 7/12 [58] Field of Search 294/1 R; 182/37,

[56] References Cited UNITED STATES PATENTS 10/1914 Farnham 248/210 2/1902 Cramer l/l97l Gutner 182/206 [451 July 3, 1973 FOREIGN PATENTS OR APPLICATIONS 35,926 3/1930 France 248/238 Primary Examiner-Evon C. Blunk Assistant Examiner-Johnny D. Cherry Attorney-Robert K. Rhea [57] ABSTRACT An elongated ladder engaging standard is connected in angular relation to one end to one end of an arm and a brace interconnected with the other end portions of the standard and arm, forms an A-frame hoist. Socket means on the standard releasably engage ladder rungs in hoist supporting relation. Tackle means on the outwardly projecting end of the arm completes the hoist.

1 Claim, 3 Drawing Figures Patented July 3, 1973 FIG.|

FIG. 2

JACK S. SOW ERY uvvzxvroe AGENT LADDER SUPPORTED HOIST BACKGROUND OF THE INVENTION ladder where work is being done on or adjacent a vertical surface of a structure. This has usually been accomplished by a workman carrying the articles or materials as he climbs the ladder. Carrying relatively heavy object while climbing a ladder, is, at best, risky in that one hand of the operator is usually employed in carrying the article or material.

It is, therefore, desirable that some means be provided which will form a hoist may be removably connected with the upper end portion of either side rail of the ladder when in operative position.

2. Description of the Prior Art US. Pat. Nos. 460,647 and 2,338,883 relate to ladder hoisting means comprising a tackle secured to one of the top rungs of a ladder which raise and lower a carriage guided by the ladder side rails.

This invention is distinctive over these patents by providing an A-frame type hoist having one of the legs of the A-frame projecting outwardly of the plane of the ladder and provided with tackle means whereby a workman on the ground may raise and lower objects to and from the position of a workman on the upper end of the ladder.

SUMMARY OF THE INVENTION An elongated standard and arm form the legs of an A-frame which are interconnected by a brace. The standard is provided with socket forming means for releasably engaging one side rail and a plurality of ladder rungs in hoist supporting relation. Tackle means, on the end portion of the arm projecting outwardly from the ladder is operated from the ground.

The principle object of this invention is to provide a relatively lightweight and sturdy A-frame type hoist which may be releasably connected with either side rail of a ladder for lifting objects and materials to be used adjacent the upper end portion of the ladder.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of the hoist in operative position on a fragmentary portion of a ladder, the latter being shown by dotted lines;

FIG. 2 is an elevational view of the hoist on the upper end portion of the ladder and illustrating, by dotted lines, the manner in which the tackle raises materials to be used; and,

FIG. 3 is a horizontal cross-sectional view, partially in elevation, taken substantially along the line 3-3 of FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENT Like characters of reference designate like parts in those figures of the drawings in which they occur.

In the drawings:

The reference numeral indicates a fragmentary portion of the upper end portion of a substantially conventional ladder, including

side rails

12 and 14 interconnected in spaced relation by a plurality of spaced apart rungs 16, 17, 18, 19, 20 and 22. The reference numeral 24 indicates an A-frame structure comprising an elongated standard 26, an elongated arm 28 and a brace 30. The standard 26 is preferably formed of angle iron material, or the like, with the inside surface of its

legs

32 and 34 dimensioned for contacting a right angular corner portion of either of the

ladder side rails

12 or 14. A rod-like member 36 is bent, intermediate its ends, in right angular relation and connected, as by welding, to the upwardly disposed end of the standard 26 forming a pair of rod legs 38 and 40 extending equidistant beyond the adjacent edge surface of the ladder side rail 12 a distance at least as great as the greatest cross section dimension of the ladder side rail. Each of the rod legs 38 and 40 are turned back upon themselves at their respective free end portions to form

U-shaped sockets

42 and 44, lying in a common plane disposed in right angular relation with respect to the longitudinal axis of the ladder side rail, with the inside dimensions of the

respective socket

42 and 44 slightly greater than the thickness of the ladder side rail 12. The purpose of the

sockets

42 and 44 is to releasably engage either one of the

ladder side rails

12 or 14 and prevent movement of the upper end portion of the standard 26 laterally or away from the plane of the ladder. Intermediate its ends, the standard is further provided with a plurality of channel-

shaped members

46, 47 and 48. The legs of the respective channel-

shaped members

46, 47 and 48 are disposed downwardly, as viewed in the drawings, with one of the legs 50 of each channel-shaped member being connected to the outer surface of the standard leg 32 adjacent its longitudinal free edge thus forming a like plurality of downwardly open sockets 52 dimensioned for cooperative reception of ladder rungs adjacent the ladder side rail 12. The

channel members

46, 47 and 48 are connected to the side rail 26 in longitudinal selected spaced-apart relation, below the position of the rod member 36 and, as shown in FIG. 2, these channel members engage the

ladder rungs

18, 19 and 22 and cooperate with the rod member 36 in preventing movement of the standard away from the plane of the ladder and distribute the load imposed on the ladder by the mass of articles being lifted as hereinafter explained.

Other identically formed channel-shaped members 46, 47' and 48' are similarly connected with the other leg 34 of the standard 26 for similarly engaging rungs of the ladder in hoist supporting relation when the A- frame 24 is positioned in an opposite position on the ladder adjacent the side rail opposite from the position shown in FIG. 2. Similarly the channel members 46', 47' and 48' cooperate with the rod member leg 40 and socket 44 in supporting the hoist on the ladder side rail 14.

The arm 28 is preferably formed from two sections of angle iron members with outer surfaces of one leg of each angle member arranged in longitudinal contiguous contact thus disposing the other legs in a'common horizontal plane, as viewed in the drawings. The brace 30 is similarly preferably formed of angle iron material for rigidity.

Tackle means comprising a block having a sheave or pulley 54 journalled by a bracket 56 in turn connected to the free end portion of the arm 28 by a U-bolt, or the like, 58. Obviously the position of the U-bolt may be adjusted longitudinally of the arm 28 as desired. A cable or rope, indicated by the dotted line 60, entrained over the pulley 54, is used for lifting material or articles in a conventional manner.

OPERATION ln operation the hoist is manually lifted or carried to the upper end portion of a ladder leaning against the vertical wall of a structure. The user, by manually grasping the brace connected end portion of the standard, positions the rod member 36 adjacent a selected one of the ladder side rails and guides the respective

rod member socket

42 or 44 into engagement with the side rail above the position of the selected rung, for example, the rung 17. The depending end portion of the standard is then positioned adjacent the ladder side rail and the entire device allowed to slide down longitudinally of the side rail until the rod leg 38 engages the upper surface of the rung 17 while simultaneously the

channel members

46, 47 and 48 engage and are supported by the

rungs

18, 19 and 22, respectively. Thus, the rod member 36 and the socket forming channel members support the hoist with the free end portion of the arm 28 projecting outwardly from the plane of the ladder. Prior to installing the hoist, the rope 60 is entrained around the pulley 54. Thereafter a workman on the ground, by means of the rope '60, can raise and lower objects to or from the position of a workman on the upper portion of the ladder adjacent the hoist. Obviously relatively heavy objects may be raised or lowered by the workman on the ground entraining his end portion of the rope 60 around the bottom rung of the ladder as a secondary pulley.

The hoist may be removed from the ladder by manually lifting it so that its socket forming members are released from the respective supporting rungs and thereafter disengaging the rod member 36 from contact with the supporting ladder side rail.

Obviously the invention is susceptible to changes or alterations without defeating its practicability, therefore, I do not wish to be confined to the preferred embodiment shown in the drawings and described herein.

1 claim:

1. A hoist in combination with a ladder having side rails joined in spaced-apart relation by a plurality of spaced-apart rungs, the improvement comprising:

an elongated standard, right angular in cross section,

extending along and contiguously contacting adjacent cooperating surfaces of one said side rail intermediate its ends and spanning the spacing between at least five of said rungs;

a rod member connected medially its ends with one end of said standard, said rod member having its end portions doubled back upon themselves in angular relation for partially surrounding an intermediate portion of one said ladder side rail for releasably connecting said standard with said ladder;

a plurality of pairs of rung engaging inverted U- shaped members connected, respectively, in longitudinally spaced relation, with said standard;

an elongated arm connected, at one end portion, with one end portion of said standard;

a brace extending between and connected at its respective ends with the other end portions of said standard and said arm, respectively; and,

a block connected with the end portion of said arm opposite said standard.

Claims

1. A hoist in combination with a ladder having side rails joined in spaced-apart relation by a plurality of spaced-apart rungs, the improvement comprising: an elongated standard, right angular in cross section, extending along and contiguously contacting adjacent cooperating surfaces of one said side rail intermediate its ends and spanning the spacing between at least five of said rungs; a rod member connected medially its ends with one end of said standard, said rod member having its end portions doubled back upon themselves in angular relation for partially surrounding an intermediate portion of one said ladder side rail for releasably connecting said standard with said ladder; a plurality of pairs of rung engaging inverted U-shaped members connected, respectively, in longitudinally spaced relation, with said standard; an elongated arm connected, at one end portion, with one end portion of said standard; a brace extending between and connected at its respective ends with the other end portions of said standard and said arm, respectively; and, a block connected with the end portion of said arm opposite said standard.