US2633391A

US2633391A - Traveling scaffold

Info

Publication number: US2633391A
Application number: US779430A
Authority: US
Inventors: Harold C Raftery
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-10-13
Filing date: 1947-10-13
Publication date: 1953-03-31
Anticipated expiration: 1970-03-31

Description

March 31, 1953 H.' c. RAFTERY TRAVELING SCAFFOLD 2 SHEETSSHEET 1 Filed Oct. 13, 1947 INVENTOR.

ggzrold C. Rafiery. M

H. C. RAFTERY TRAVELING SCAFFOLD March '31, 1953 2 Sl-IEETSSHEET 2 Filed Oct. 13, 1947 INVENTOR.

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Patented Mar. 31, 1953 UNITED STATES PATENT OFFICE 3 Claims.

This invention relates to a mobile painters hoist or scaffold, by means of which a painter or other workman can move himself both horizontally and vertically over a buildin wall which is being worked upon.

An object of my invention is to provide a novel mobile painters hoist or scaffold, on which the workman can stand and can control his movements both horizontally and vertically from a stand or cage in which he is working.

Another object of my invention is to provide a novel mobile hoist or scaffold, including an electrically operated table which is positioned on the roof of the building, and which is caused to move over the roof of the building by an electric drive.

Still another object of my invention is to provide a novel mobile hoist or scaffold which can be quickly and easily set up on the roof of the building, and which will move along the roof of this building with ease and facility.

Other objects, advantages and features of invention may appear from the accompanying drawing, the subjoined detailed description and the appended claims.

In the drawing:

Figure l is a perspective view of the mobile table in position on a roof.

Figure 2 is a top plan view of the same.

Figure 3 is a perspective view of the workmans cage or stand.

Referring more particularly to the drawing, my invention consists of a mobile table I, and a cage 2, which is supported by the table I, and is controlled as to its horizontal and vertical position by the control mechanism on the table I, all of which will be further described.

My mobile hoist or scaffold is particularly useful when used on buildings including a roof 3, and a fire wall 4. The table I, includes a top 5, and a pair of rear legs 6, and a pair of front legs 7. The rear legs 6, are adjustable as to length by suitable means, such as the matching holes 8.

A pair of brace legs 9-9, are attached to the legs 6 and I, and each brace leg has a wheel or roller I0, mounted on its outer end to bear against the fire wall, 4. The brace legs 9, are also adjustable in length by suitable means, such as the matching holes II. A boom I2, projects outwardly from the table top 5, and i fixedly attached at its inner end to this table.

A pair of Wheels or rollers l3-I3, are mounted at the outer end of the boom I2, and these last named wheels rest on top of the fire wall 4, and roll alon this wall as will be further described.

An electric motor 14, is mounted on the top 5, and this motor drives the reduction gear I5, and the drive shaft I6, extending from this gear. The drive shaft I 6, is attached to one of the wheels I 3, and when the motor I4, is energized, the drive wheel I3, will be driven, thus moving the entire table assembly I, across the roof 3, and along the fire wall 4. The motor I 4, is controlled by the workman from the scaffold 2, as will be further described.

An electric motor I1, is also mounted on the top 5, and this motor drives the reduction gear I8, which in turn drives the reel I9. A cable 20, extends from the reel I9, and thence over a sheave 21, on the end of the boom I2, and is fixedly attached to the transverse lift bar 22, of the scaffold 2.

The scaffold 2, is preferably formed of structural members and is built up as a frame substantially as shown, including the floor 23, upon which the workman stands. The lift bar 22, is attached to the scaffold by means of slings 24,'so that the lift bar can move inwardly or outwardly relative to the wall, as the scaffold 2, might be raised or lowered, A plurality of rollers 25, are attached to the scaffold 2, and rest against the wall so that the scaffold can be easily moved. An electric control box 25, is mounted on the scaffold 2, and this control box is connected to the motors I4, and IT, to actuate these motors as the workman desires to move either horizontally or vertlcally across the face of the building wall.

The motors I4, and I1, are of the reversible type, all of which is usual and well known, consequently, the drive wheels I3, can be rotated in either direction, thus moving the table I, horizontally in either direction, Similarly, the reel I9, can be rotated in either direction, thus raising or lowering the scaffold 2, as may be desired.

The arms 9, are used as braces to hold the table I, a proper distance from the fire wall 4. Furthermore, the weight of the motors I4, IT, as well as the gear boxes, the reel I9, etc., is sufiicient when positioned at the end of a lever arm, such as the boom, I2, to adequately counter-balance the weight of the workman as well as the weight of the cage 2.

Having described my invention, I claim:

1. A mobile hoist comprising a table,legs depending from the table, rollers mounted on the legs, a table top, a boom projecting from the table top, a wheel mounted on the boom, an electric motor mounted on the table top, drive means eX- tending from said motor to said wheel on the boom, a reel mounted on the table top, a sheave on the boom, the cable extending over the sheave and around said reel.

2. A mobile hoist comprising a table, a pair of legs depending from said table, means to adjust the length of said legs, a roller mounted on the lower end of each of the legs, a pair of horizontal brace legs mounted on the table and projecting therefrom, means to adjust the length of said horizontal brace legs, a roller journalled on the outer end of each of said brace legs, a boom mounted on the table and projecting therefrom, a support wheel mounted adjacent the outer end of said boom, an electric motor mounted on the table, drive means extending from said motor to the supporting wheel mounted on the boom.

3. A mobile hoist comprising a table, a pair of legs depending from said table, length adjusting means on each of said legs, a roller mounted on the lower end of each of the legs, a pair of horizontal brace legs fixedly mounted below the table and projecting beyond one edge of the table, length adjusting means on each of the horizontal brace legs, a roller journalled on the outer end of each of said brace legs, a boom fixedly mounted on the top of the table and projecting horizontally therefrom, a support wheel mounted adjacent the outer end of said boom, an electric motor mounted on the table, a drive shaft extending from said motor to the supporting wheel on the boom.

HAROLD C. RAFI'ERY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 553,768 Arrouguier Apr. 10, 1866 414,218 Holm Nov. 5, 1889 1,421,609 Sturm July 4, 1922 1,423,998 Camp July 25, 1922 2,164,128 Medenwald June 27, 1939 2,491,621 Roos Dec. 20, 1949 FOREIGN PATENTS Number Country Date 11,237 Germany Oct. 1, 1880 174,704 Great Britain Jan. 27, 1922