US2544368A

US2544368A - Scaffold bracket for ladders

Info

Publication number: US2544368A
Application number: US727605A
Authority: US
Inventors: Irvin I Thorne
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-02-10
Filing date: 1947-02-10
Publication date: 1951-03-06
Anticipated expiration: 1968-03-06

Description

I. l. THORNE SCAFFOLD BRACKET FOR LADDERS March 6, 1951 Filed Feb. 10, 1947 /NVENTOR IRV/N THORNE ATTORNEY Patented Mar. 6, 1951 UNITED STATES PATENT OFFICE SCAFFOLD BRACKET FOR LADDERS Irvin I. Thorne, Portland, Oreg.

Application February 10, 1947, Serial No. 727,605

1 Claim.

This invention relates generally to ladders and scaffolding and particularly to a scaffold bracket for ladders.

The main object of this invention is to provide a convenient and simple form of bracket whereby ladders can be successfully used to support scaffold planks, and in which the workman is enabled to select with greater precision the desired height to which the scaffold plank is to be set.

The second object is to expedite the work of mechanics by enabling them to set their scaffold at the correct level or one best adapted for the work at hand.

The third object is to construct a bracket of the class described which can be used in conjunction with the ordinary step ladder or a ladder having the conventional round rungs.

I accomplish these and other objects in the manner set forth in following specifications as illustrated in the accompanying drawing, in

which:

Fig. l is a fragmentary side elevation of the upper portion of a step ladder showing my device applied thereto.

Fig.2 is a plan of Fig. 1.

Fig. 3 is a fragmentary side elevation of the upper portion of a conventional round rung ladder showing my device applied thereto.

Fig. 4 is a front elevation of Fig. 3.

Fig. 5 is a perspective view of the device.

Similar notes of reference refer to the same or similar parts throughout the several views.

Referring in detail to the drawing, there is shown in Fig. 1 and Fig. 2 a common form of step ladder having main rungs Ill between which are mounted the steps II. To the rungs In is secured a top step I2 by means of the plates I3, hinged to the plates I3 are the brass rungs I4.

The problem is to support the scaffold plank I5 from the step ladder. In many cases the step II may be too low and the step I2 may be too high.

In order to take care of this condition, I have provided a pair of upright members I6 having the turned ends II provided with the downturned hooks I8 as shown clearly in Fig. 5. The lower end I9 is curved and has an upwardly turned portion 20 which is free to swing under the step I I when the downturned hook I8 is hinged to the step I2 by passing through the hole 2|. It will be noted that there are two members I6, and that across same ar secured the

horizontal straps

22 and 23, which are secured to the member I6 by the screws 24 or in any other convenient manner.

The positioning of the

straps

22 and 23 are such as to divide the distance between the top of the step II and the top of the step I2 into three parts giving the user four positions to select from instead of two as is customarily the case.

In Fig. 3 and Fig. 4 are shown the common form of ladder 25 with the supporting rungs 26 together with the hinging rung 21 and the

usual step rungs

28 and 29. In this form of ladder the device is inverted; that is, the end I9 hinges from the rung 28 while the opposite end bears against the rung 29, as shown the plank 30 rests upon the strap 23. It can be seen from the foregoing that in either of the forms of ladder employed, the operator has an opportunity to select more closely the height at which his scafiold plank I5 or 39 is to rest.

I am, of course, aware that numerous forms of scaffold brackets have been constructed in the past. I, therefore, do not claim such devices broadly but I do intend to cover such forms and modifications thereof as fall fairly within the appended claim.

I claim:

A scaffold bracket consisting of a pair of upright members having a pair of plank supporting straps holding said members in parallel re lationship, said members having one pair of ends turned substantially normal thereto, equalling the width of a stepladder tread, each of said ends having a square turned hook, the opposite ends of said member having rounded hooks formed therein opposed to said square hooks.

IRVIN I. THORNE.

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

UNITED STATES PATENTS Number Name Date 1,758,319 Holmes May 13, 1930 2,140,828 Carle Dec. 20, 1938 2,329,643 Nelson Sept. 14, 1943