US2212384A

US2212384A - Hoisting attachment for ladders

Info

Publication number: US2212384A
Application number: US292086A
Authority: US
Inventors: Brandel Martin
Original assignee: Individual
Current assignee: Individual
Priority date: 1939-08-26
Filing date: 1939-08-26
Publication date: 1940-08-20
Anticipated expiration: 1957-08-20

Description

M. BRANDEL HOISTING ATTACHMENT FOR LADDERS Filed Aug. 26, 1939 ATTORNEYS Patented Aug. 20, 1940 UNITED STATES PATENT QFFECE HOISTING ATTACHMENT FOR LADDERS Martin Brandel, Buffalo, N. Y.

Application August .26, 1939, Serial No. 292,086

' 3 Claims. (01. 24s 210) This invention relates to a hoisting attachthereon and adapted to carry the tackle whereby ment for ladders whereby an ordinary ladder may the load is to be lifted. be converted into an apparatus for hoisting ma- In its preferred construction, this carriage terials such, for example, asroofing materials comprises a frame which includes upper and which are used in constructing or repairing the lower metal cross bars I2, it which extend in '5 roofs of houses, although the same may also be spaced relation across the front side of the ladder 'used advantageously for other purposes. and upright metal side bars Hi, M which con- It is the object of this invention to provide nect corresponding ends of the cross bars and a hoisting attachment of this character which are preferably arranged in line with the side in is very simple in construction and low in cost rails. The connection between the horizontal '10 and which can be readily applied to ladders of and upright bars of the frame may be effected various widths and which can be readily adjusted either by rivets l5, as shown in the drawing, or with reference to the position of the load to be by other suitable means, such as electric welding.

lifted so that this can be done most efiiciently Means are provided for locking this frame on M and with the greatest safety. different rungs of the ladder for the purpose of 15 In the accompanying drawing: holding the hoisting apparatus at different points Fig. 1 is a fragmentary front elevation of a in the height of the same to suit the location ladder equipped with a hoisting attachment emwhere the work-is being done on a building. As

bodying this invention. shown in Figs. 1, 2 and 5, these locking means Fig. 2 is a vertical section taken on line 22, include two supporting hooks it which are 20 Fig. 1. mounted on the lower cross bar of the carriage Fig. 3 is a horizontal section, on an enlarged and project rearwardly and downwardly therescale, taken on line 33, Fig. 1. from over one of the rungs of the ladder, as Fig. 4 isa fragmentary view of the adjusting shown in Fig. 2. mechanism showninFig. 3 but in a different posi-, In order to hold the lower part of the frame 5 tion. against horizontal movement on the ladder these Fig. 5 is a horizontal section, on an enlarged supportinghooks [6 are engaged with the inner scale, taken on the correspondingly numbered line sides of the ladder rails l8 and to permit such in Fig. 1. Y hooks to be engaged with the rails of different p Fig. 6 is a fragmentary front view of a hoisting ladders having their rails spaced different dis- 30 attachment showing a modification of the means tances apart, means are provided for adjusting for-holding the lifting mechanism in its adjusted these hooks horizontally on the frame. The

position, preferred means for effecting such adjustment Fig.1! is a top plan view of the construction of these hooks, as shown in Figs. 1 to 5, consist shown in 6. of a bracket arm ll projecting downwardly from 35 In the following description similar characters the front end of each hook and engaging with 1 of reference indicate like parts in the several the front side of the lower frame cross bar I3, figures of the drawing: and a clamping bolt I8 passing through each This hoisting attachment may be used in conof these arms and through a horizontal slot 19 40 nection with ladders which vary in detail conin the adjacent part ofsaid lower cross bar. 40 struction and are made of various materials, Upon loosening the bolts t8 the hooks l6 may but the ladder shown in the drawing as one suitbe slid horizontally the requisite extent for able for use in connection with this attachment engaging them with the inner sides of the ladder comprises two upright side rails of wood which rails after which these hooks may be held in are spaced apart and connected at suitable inplace by tightening these bolts and thereby hold- 45 tervals throughout the height of the same by ing the lower part of the hoisting frame and means of horizontal rungs or rounds .H which the ladder against horizontal displacement relaare also made of wood. tive to each other.

In its general organization, the hoisting The upper part of the hoisting frame is conattachment embodying this invention, comprises nected with the rails of the ladder by means. 50 an upright carriage which is adapted to be slid which operateto guide this frame vertically on vertically on the ladder into the position best the ladder and also hold the same against horisuited for handling the load which is to be lifted, zontal displacement relative to each other. The and a derrick pivotally mounted on the carriage preferred means for accomplishing this purpose '55 so as to be capable of swinging horizontally consist of two guide hooks 20 which engage with the rear and lateral sides of the ladder rails and are adjustably connected with the opposite ends of the upper frame cross bar I2 by means of clamping bolts 2| passing through a bracket arm 22 of each guide hook and through a horizontal slot 23 in the adjacent end portion of the upper frame cross bar I2, as best shown in Fig. 3. By these means these hooks not only serve as guides which hold the frame against forward, backward and sidewise movement on the ladder, but also permit of shifting these guide hooks relative to the frame in order to adapt the latter to rails of ladders which are spaced different distances.

Owing to the adjustability of the supporting hooks and the guide hooks on the lower and upper parts of the frame, this apparatus can be mounted on ladders which vary in width and thus renders the apparatus as a whole very flexible and avoids the necessity of providing frames or carriages of different widths to fit different widths of ladders.

The derrick whereby the hoisting tackle is mounted on this carriage may be variously constructed, but in its preferred form the same is constructed as follows:

The numeral 24 represents an upper hearing which forms part of a bracket 25 secured to the rear side of the upper frame bar I2 by means of rivets 26, as shown, or by electric welding. The numeral 21 represents a lower bearing which forms part of a bracket 28 secured to the lower frame bar I3 by rivets 29, as shown in Fig. 5, or other suitable fastening. The two

bearings

24, 21 project forwardly from their respective brackets and are connected with each other by means of a bearing tube 38 which also operates to stiffen the carriage as a whole, this tube being preferably connected with the upper and lower hearing by means of electric welding.

The numeral 3! represents an upright hoisting shaft or mast which is arranged in the upper and

lower bearings

24 and 21 and in the bearing tube 30 and is capable of turning horizontally therein. Near its upper end this shaft is provided with a stop collar 32 which rests on the upper bearing so as to limit the downward movement of this shaft and at its lower end this shaft is provided with a cotter pin 33 adapted to engage with the underside of the lower bearing 21 and prevent the shaft from rising. At its upper end this shaft is provided with a laterally projecting horizontal arm or beam 34 which is preferably formed integrally with the shaft 3! from a piece of round metal, such as iron. For the purpose of strengthening this derrick and holding the arm reliably in position relative to the shaft, an inclined brace 35 is employed which connects the central part of this arm with the shaft immediately above its collar 32.

At its outer end the arm 34 is provided with a hook 36 which is adapted to support the clevis 31 of the pulley or sheave 38 which together with the rope 39 passing around the pulley form part of the tackle whereby the load to be handled is raised-and lowered. By swinging this derrick about the upright axis of the bearings on the carriage the tackle may be shifted horizontally for bringing the same into the position best suited for lifting the load.

Adjusting means are provided for retaining the derrick and the tackle mounted thereon in 2. definite position during the hoisting operation and thereby avoiding accidents while doing this work. The retaining means for this purpose shown in Figs. 1, 2, 3 and 4 are constructed as follows:

The numeral 40 represents a horizontal retaining plate of metal which is secured to the shaft 3| and preferably forming part of the collar 32.

and provided in its curved outer edge with a segmental row of locking notches or recesses 4!, 42. On opposite sides of the shaft 3| two detent or locking catches or dogs 43 are pivotally mounted on the upper frame bar l2 by means of rivets 44, or the like, so that either of these catchescan be engaged with and disengaged from the locking recesses of the plate 40. These locking recesses are arranged in a row and the endmost recesses 42 extend tangentially from the peripheral edge of the plate 42 inwardly, while the intermediate locking recesses 4| are made wide at their inner ends and narrow at their outer ends, as shown in Figs. 3 and 4.

By this means either one or the other of the catches 43 may be engaged with the respective end recess or notch 42 at one end of the segmental row for holding the arm or beam of the derrick in one extreme of its horizontally turned position and it is also possible for either of the catches to engage one or another of the intermediate locking recesses which are of substantially keyhole or undercut formation so that when one of these catches is swung into one of these'intermediate recesses, this catch will engage one of its sides with one side of this recess from the outer to the inner end thereof, while the opposite side of the catch will only engage its outer part with the outer part of the opposite side of this recess, as shown in Figs. 3 and 4.

By this means the rotatable shaft and arm together with the load connected therewith by means of the tackle may be reliably held in any position with reference to the axis of the derrick and thus permit of lifting the load with the greatest safety.

In the preferred construction of this hoisting.

attachment the

bracket bearings

24, 21 and this bearing tube 30 forming the bearing in which the shaft or mast 3| is journaled are arranged on the carriage midway of its opposite vertical edges and the upper end of this shaft is extended upwardly roof at the desired angle and the hoisting apparatus is attached to the uppermost part thereof so the arm 34 can turn clear of the upper end of the ladder. The load is then attached to the tackle which is mounted on the arm 34 while the latter is turned to the front side of the carriage and ladder.

After the load has been elevated to its highest position the shaft 3i and arm 34 are turned so that the arm swings from the front side of the carriage and ladder over the upper ends of the same and then to the rear side thereof after which the load maybe deposited on the roof of the building. The hoisting of the load from the ground to the roof can therefore be effected easily, quickly, conveniently, safely and economically.

Instead of using the adjusting device for the derrick shown inFigs. 1, 2, 3 and 4, the modified form of the same shown in Figs. 6 and 7 may be employed. In this modified form the retaining plate 40 is provided adjacent to its outer curved edge 55 with a segmental row of openings 46 one or the other of which is adapted to receive a retaining pin 41 adapted to engage the front side of the upper frame cross bar l2 against which it is held by the weight of the load onthe arm of the derrick and thereby Drevent displacement of this arm during the lifting operation.

As a'whole, this hoisting attachment. is very simple in construction and capable of being produced at relatively low cost. The same is very compact and therefore can be stowed away when not in use and also capable of being conveniently transported from one job to another. For using this hoisting attachment the same can be very quickly mounted on various sizes of ladders which may be available on a job and after being erected this attachment together with the ladder forms a hoisting apparatus which permits of hoisting loads to and from thereof of a building or elsewhere with ease and facility and without endangering the operators.

I claim as my invention:

1. A hoisting attachment for a ladder having upright side rails and a plurality of horizontal rungs connecting the side rails, said attachment comprising a carriage slidable vertically on said ladder and having-upper and lower cross bars and upright side bars connecting corresponding ends of the horizontal bars, upper and lower bracket bearings arranged on the upper and lower bars, a bearing tube connecting, said bracket bearings, an upright shaft journaled in said bracket bearings and bearing tube, a collar arranged on said shaft and resting on said upper bracket bearing, and an arm projecting laterally from the upper end of said shaft.

2. A hoisting attachment for a ladder having upright side rails and a plurality of horizontal rungs connecting the side rails, said attachment comprising a carriage slidable vertically on said ladder, a shaft journaled on said frame to turn horizontally and provided with a supporting arm, and adjusting means for holding said shaft and axis of said shaft including a retaining plate '10 arm in different angular positions relative to the mounted on said shaft and provided in its edge with a segmental row of locking recesses each and adjusting means for holding said shaft and arm in different angular positions relative to the axis of said shaft including a retainii r plate provided with a segmental row of ope and a retaining pin adapted to engage v 1 one or another of said openings and to against said frame on either side of said shaft.

MARTIN BRANDEL.