US2281039A - Scaffold jack - Google Patents

Description

p 28, 194?6 E. L. JONES 2,281,039

SCAFFOLD JACK Filed Sept. 23, 1940 2 Sheets-Sheet l jg, .Z

Inventor 4 M67? L. Jon/5 A iiorney April 28, 1942.

- E. L. JONES SCAFFOLD JACK File'd Sept. 23, 1940 2 Sheets-Sheet 2 I Inventor 54410? L. JONES A tiorney Patented Apr. 28, 1942 UNHTED STATES SCAFFOLD JACK Elmer L. Jones, Indie, Calif.

Application September 23, 1940, Serial No. 357,963

1 Claim.

This invention relates to scaffold jacks and an object of the invention is, generally, to improve upon such jacks as are now known and used for the purpose stated.

A further object of the invention is to provide a scaffold jack which may also be used with equal facility by carpenters and analogous building tradesmen as a sawhorse.

The invention together with its objects and advantages will be best understood from a study of the following description taken in connection with the accompanying drawings wherein- Figure 1 is an elevational view illustrating the application of the invention and as used in the construction of a scaffold.

Figure 2 is a top plan view of the scaffold jack.

Figure 3 is an elevational view of the scaffold jack, and

Figure 4 is a view through the jack with certain parts shown in section and other parts shown in elevation, and illustrating certain details hereinafter more fully referred to.

Referring more in detail to the drawings it will be seen that in the preferred embodiment thereof the device which may be termed a combination scaffold jack and sawhorse in the preferred embodiment thereof comprises 'a cross-bar 5 supported adjacent the opposite ends thereof by leg structures 6.

Each of the leg structures 6 embodies a pair of standards I1 which are disposed so as to converge as they approach the upper ends thereof,

and at said upper ends the standards 1 are con Also intermediate the ends thereof the standards I are connected together and braced relative to one another through the medium of a brace member ID that at its respective opposite ends is provided with flanges ll bolted or otherwise secured as at [2 to the standards I as shown.

Also rising vertically from the brace member is a post 13 that at one end is suitably anchored as at M to the cross-member ID. The post l3 extends upwardly through suitable aligned openings provided therefor in the cross-bar and bight of the bracket 8 as will also be clearly seen from a study of Figure 4.

The posts l3 support in suspended position therebetween, and at the desired position of vertical adjustment a scaffold board-supporting crossmember l4 which may be in the form of an oblong bar of wood, metal, or other suitable material.

The member M has fastened to each end thereof through the medium of a U-bolt 5 a suspension element l6. The element 56 is in the form of a plate formed at one end with a hinge eye ll that is engaged with the U-bolt as shown, and at the free end thereof with an opening through which the post 13 extends.

It will thus be seen that the weight of the member l4 and the scaffold plank supported thereby will exert a downward pull on the suspension elements It so that the same will frictionally engage the posts [3 for holding the member M in the desired suspended positioned between the posts I 3.

In using the jack for scaffold-building purposes, a pair of such jacks, as shown in Figure 1, may be used. When so used the upper platform plank H; of the scaffold is extended between and supported by the members 14, and a lower scaffold platform plank or board may be, if desired, supported between the members 5 of the jacks through the medium of clamping plates 20.

In connection with the clamping plates 20 it will be seen that each jack is provided with a clamping plate 20 between which and a member 5 of the jack one end of the scaffold plank I9 is clamped; the clamping plate 20 being supported beneath the bottom of the member 5 through the medium of depending bolts 21 equipped with nuts 22. (See Figure 3.)

It will also be appreciated that when desired the jacks, with or without removing the members l4, may be used as sawhorses.

It will also be apparent that with the use of these jacks scaffolds may be readily and easily erected, and as easily taken down; and the simplicity of the invention, together with the many advantages thereof are believed to be clear to those skilled in the art without requiring more detailed description of the invention.

Having thus described the invention what is claimed as new is:

A scaffold jack comprising an elongated cross piece, a leg structure adjacent each end thereof and each structure including a pair of downwardly diverging members, means for connecting said members at their upper ends to the cross piece and a brace plate extending between the members of each pair intermediate the ends thereof. and

connected therewith, a pair of posts extending upwardly from the cross piece and each post passing through the cross piece to a brace plate to which the post is welded, a second cross piece extending between the posts and of less length than the distance between the two posts, plates having openings therein through which the posts pass and means for hinging the inner ends of the plates to the upper face of the second cross piece adjacent the ends of the cross piece.

ELMER L. JONES.

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