US 2588399 A
Description (OCR text may contain errors)
March 11, 1952 MCQUIN 2,588,399
- SCAFFOLD SUPPOR'I Fild April 8, 1949 INVENTOR,
Patented Mar. 11, 1952 UNI T'ETD :i'S TATGEIS ENT FF I CE SCAFFOLD SUPPORT Clarence F. McQuin, Milwaukee, Wis.
Application April 8, 1949, Serial No. 86,357
1 Claim. 1
This invention relates to scaffold supports or scaffold jacks and more particularly to an improved tripod jack or support for holding platform boards in an elevated position.
It is among the objects of the invention to provide an improved tripod jack that can be quickly and easily collapsed or folded for storage and transportation and unfolded or spread to operative condition, that is fully adjustable as to height and leveling, that is easily and securely locked in adjusted condition, that is strong and sturdy in construction, will support boards or planks in either a flat or on edge position, is light in weight and economical to manufacture.
Other objects and advantages will become apparent from a consideration of the following description and appended claim in ccniunction with the accompanying drawing wherein:
Figure l is an elevation of a tripod scafiold jack illustrative of this invention; and
Figure 2 is an elevation of the fragmentary upper portion of the jack with such upper portion turned ninety degrees from the position illustrated in Figure 1.
With continued reference to the drawing, the improved tripod jack has an elongated tubular stem til. A tubular sleeve II is slidable on the stem and carries a set screw l2, or equivalent fastener, for securing the sleeve in adjusted position longitudinally of the stem. Apertured lugs i3 extend outwardly of the sleeve ll near the upper end thereof and are disposed at their substantially equally spaced locations around the sleeve. Three tubu ar upper leg sections id have their upper ends flattened and apertured and pivotally secured to corresponding lugs l3 by re spective pivot pins l5.
A bracket I6 is secured on stem I El adjacent the lower end of the latter and apertured lugs I! extend outwardly from the bracket at substantially equally spaced locations therearound.
A respective apertured lug l8 extends outwardly from each upper leg section l4 near the lower end of the latter and links l9 are pivotally con nected one to each lug It at one end of the link and at its opposite end to a corresponding lug H on the bracket.
Cylindrical lower leg sections are telescopically secured one in each tubular upper leg section It and suitable pads 22! of resilient ma terial are provided one on the lower end of each lower leg section. Set screws 22 are carried one by each upper leg section it and these set screws are engageable with the corresponding lower leg sections to secure the lower sections in adjusted position in the upper sections.
A cylindrical socket 23 is releasably secured on the upper end of stem [0 by a set screw 24 or other suitable fastener and a plank supporting plate 25 is secured to the socket.
Plate 25 is an elongated, rectangular body of thin, strong metal, such as steel, and has upwardly extending flanges 26, one at each end substantially perpendicular to the adacent portions of the plate, and a U-shaped formation 21 at substantially the mid length location of said plate.
Plate 25 will receive a plank 28 in flat position between the flanges 26 and will receive a plank on edge in the U-shaped formation 21 so that flat positioned planks may be supported on edges of planks to provide a platform of desired size.
Two or more of the improved jacks may be used depending upon the size of the structure to be worked on. For example, four such jacks disposed one in each corner of a dwelling house room and supporting two planks on edge and the necessary number of flat planks will permit the entire ceiling of such a room to be worked on from a single scaffold platform.
The jacks may be made in various sizes as to height and in different weights depending upon the loads to be carried thereby.
The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiment is. therefore, to be considered in all re pects as illustrative and not restrictive, the the scope of the invention being indicated by the appended claim rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claim is, therefore, intended to be embraced therein.
What is claimed is:
A headplate for a scaffold jack tripod comprising a cylindrical stem receiving socket and an elongated metal strip mounted on said socket, said strip having its opposite end flanges extending perpendicularly in the same direction therefrom and having at its mid-length location a U shaped formation extending from said strip in the direction opposite said flanges and secured at its end remote from the remainder of said strip to said socket, said headplate having between said flanges a length sufficient to receive the width of a scaffold board and said U shaped formation having an interior width sumcient to 3 receive the thickness of a scaffold board and a. UNITED STATES PATENTS depth sufficient firmly support such a board in Number Name Date an edgewlse Wfltion- 412,989 Sixsmith Oct. 15, 1889 529,707 Clay Nov. 27, 1894 CLARENCE MCQUIN- 5 607,841 Flegel July 26, 1398 REFERENCES CITED 988,948 Reinhard Apr. 4, 1911 The following references are of record in the 1234510 Trautwem July 1917 file of p t FOrSyth July 9, 2,140,617 Castody Dec. 20, 1938 10 2,297,316 Padgett Sept. 29, 1942