US1871919A

US1871919A - Form for concrete columns

Info

Publication number: US1871919A
Application number: US321565A
Authority: US
Inventors: Fred V Schubert
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-11-24
Filing date: 1928-11-24
Publication date: 1932-08-16
Anticipated expiration: 1949-08-16

Description

Aug. 16, 1932. F. v. SCHUBERT FORM FOR CONCRETE COLUMNS Filed Nov. 24, 1928 1 t e e h s S t e e h s 4 5:: llll'llllIllllHlllllll mfi:

= nuun v Aug. 16, 1932.

F.V.SCHUBERT FORM FOR CONCRETE COLUMNS Filed Nov. 24, 1928 4 Sheets-Sheet 2 g- 16, 1932- F. v. SCHUBERT 1,871,919

FORM FOR CONCRETE COLUMNS Filed Nov. 24. 1928 4 Sheets-Sheet 3 Aug, 16, 1932. F. v. SCHUBER-T 1,

FORM FOR CONCRETE COLUMNS Fi led Nov. 24. 1928 4 Sheets-Sheet 4 Z Patented Aug. 16, 1932 invrrao srn'ras FRED V. SCHUBERT, OF BOSTON, MASSACHUSETTS FORM FOR CONCRETE COLUMNS Application filed November 24 1928. Serial No. 321,565.

This invention relates to forms for use in making concrete columns.

The forms ordinarily used for this purpose are made of wood. Their erection and subsequent removal after the column has set not only is expensive in materials but also in time and labor. YVith a View to reducing this expense a great variety of metal forms have been proposed but so far-as I have been able to learn they have met with only indifferent bolts and nuts which rust and are the cause.

of much trouble. p

The present invention deals with this pro hlem and it aims to devise a thoroughly practical solution for it. It provides a form which can be erected or disassembled with aminimum of labor, which has ample strength and rigidity to withstand the hydrostatic pressure of the concrete mixture while it is still in a semi-fluid mass and which, in addition to being adjustable for columns of different dimensions and shapes, still is economical to manufacture.

The nature of the invention will be readily understood from the following description when read in connection with the accompanying drawings andthe novel features will be particularly pointed out in the appended claims.

In the drawings,

Fig. 1 is a side view of a form for a column of square cross section, this form being constructed in accordance with the present invention Fig. 2 is a in Fig. l;

Fig. 3 is a plan view of bars used in the girdle shown in Figs. 1 and 2;

Fig. at is a view similar to Fig. 1 showplan view of the form shown provision for adjusting the form verused in the form shown in Figs. 1, 2 and-1;

Fig. 8 is a plan View of a key which preferably is used in securing the sections of the form together;

Figs. 9 and 10 are plan views of wedges used in the construction illustrated; v

Fig. 11 is a perspective View of a modified form of girdle; and

Fig. 12' is a perspective view of the yoke shown in Fig. 1 j

The drawings show the invention as embodied in a form designed for the making of square concrete columns, although it will e understood that it is equally useful in making columns of other cross sectional shapes. Referring first to Figs. 1 and 2,

it will be seen that theform there shown 1 comprises a series of sheet metal sectionsor units 2 each of channel section. These units are relatively long and narrow and extend longitudinally of the column. The number of these units used will necessarily depend upon the shape and dimensions of the column and the dimensions of the units themselves. In the form illustrated in F ig. 2 three of these units are used at each side of the column. At the corners of the column additional sheet metal units 3 of angular section are used.

. It will be observed that these units are arranged edge to edge with their mar inal flanges extending backwardly away from the column and the flanges of adjacent units abutting against each other. In order to secure the units together the flanges are perforated or slotted to receive fastening devices, this slotted construction being clearly shown in Figs. 5,, 6 and 7. The slots are similarly locatedin all of the units so that the slots of abutting flanges of adjoining units will register with each other. -Prefer- 1 ably keys 4 and wedges 5 (see Figs. 8 and 9) are used to fasten these units together. These parts preferably are made out of relatively heavy sheet metal. Each key, as show in Fig. 8, has a head 6 and a shank 7 of suitable dimens'zons to fit in the slots in the flanges of the units, this shank being slotted, as shown at 8, to receive the key 5, and the end portion of the shank being tapered. The keys are inserted in the registering slots of abutting flanges of the units and the wedges 5 are then driven into the slots in the keys, thus clamping each pair of abutting flanges between the head of the key and the wedge.

ling and the disrupting action of the hydrostatic pressure to which the form necessarily is subjected in practice and which is very severe in the case of long columns of large cross section, a series of girdles or belts is provided. In the construction shown in Figs. 1 and 2, each belt consists of four bars indicated, respectively, at 10, 11, 12 and 13. The bars and 12 are substantially alike, and the bars 11 and 12 also are duplicates of each other but are of diflerent construction from the

bars

10 and 12. That is, the la"- ter bars are slotted, as best shown at 14, Fig.

1, to receive the end portions of the bars 11 and 13. These bars are arranged horizontally so that they bear edgewise against the form and their overlapping portions are provided with diagonal slots 15, preferably arranged at an angle of approximately with reference to the edges of the bars. The slots of the overlapping portions of the bars at the corners of the form can readily be brought into register with each other, and the bars are secured in this relationship by large wedges 16, one wedge being driven down through each pair of registering slots. As best shown in Fig. 2 the slots in which the wedges 16 are located are directed, re-

' spectively, toward the corners of the form.

It will be clear, therefore, that as these wedges are driven down. each wedge will tend to slide the bars which it engages along the sides ofthe form toward its respective corner. This tightens the girdle firmly around the form and holds the girdle in its tightened condition.

A series of these girdles are used on each form, the irdles being spaced vertically from each other. If desired certain of the girdles can be made to rest on the keys 4 r as shown, for example, in the lower part oi Fig. 1. Obviously the number and spacing of the girdles used will depend upon the d mensions of the column being poured, a long column of large cross section requiring a closer spacing of the girdles, particularly at the lower part of the form, than a shorter or smaller column.

The erecting of a form of this construction will be obvious from the foregoing description. This erecting operation can be performed very rapidly, and after the column has been poured and set the form can be taken down quickly by knocking out the wedges 16 and removing the girdles, and then knocking out the wedges 5 at the corners of the form so as to release the side sections of the form from each other.

The

units

2 and 3 may conveniently be made of twenty gage sheet steel, although other materials and diflerent thicknesses can also be used. The bars for the girdles should be made of heavier stock. While the units 2 can be made of any suitable width, it will be round convenient for ordinary construction purposes to use units of three and four inches in width. With these two sizes forms can he built for the pouring of a'great variety of sizes and shapes of columns. observed that since the units do not overlap each other at the face of the column but are arranged in an edge to edge or abutting relationship, the form produces a smooth faced column without the longitudinal grooves which are made in the faces of the columns when overlapping plates or sections are used. At the same time this construction efliectual- 1y resists the tendency of the concrete to buckle or spread the form, due partly to the flanged construction of the units and partly, also, to the fact that the edges of these flanges bear against the edges of the girdle bars 10, 11, 12 and 13, this arrangement being particularly effective in resisting the hydrostatic pressure created within the form when the concrete is poured. The use of wedges to hold the units together and to fast-en and tighten the girdle sections is a great convenience both in erecting and taking down the forms. 1

Usually the

units

2 and 3 are shorter than the height of the column to be poured, and in order to make the form adjustable for height, it may be made in upper and lower sections, the units of the upper section being telescoped with those of the lower section. This arrangement'is shown in Fig. 4, from an inspection of which it will be seen that the units 2 of the upper section of the form are sprung inside the corresponding units 2 of the lower section. This can readily be done due to thenature and construction of the units. Thus in the region A, Fig. i, where the upper and lower sections overlap each other, each key 4 and its cooperating wedge 5 will clamp four flanges together, as clearly shown in the drawings. t the upper ends of the flanges of the lower units 2 there will be narrow tapering cracks 17, Fig. 4, between the flanges of the upper units 2. If these units, however, are made of twenty gage sheet steel, as above stated, the maximum width of these cracks is so small that they cause no trouble in actual practice. I

It should be It will now be evident that the invention provides a metal form for making concrete columns which is economical to manufacture, convenient to handle, which can be used in the pouring of a great variety of sizes and shapes of columns, and which results in the saving of time, labor and materials as compared with the use of wooden forms. This has definitely been established in the practical use of the invention.

While I have herein shown and described a typical embodiment of my invention, it will be understood that this embodiment has been disclosed rather by way of illustration than limitation and that the invention may be embodied in a great variety of other forms without departing from the spirit or scope thereof. F or example, the changes required to produce other flat sided columns will be obvious. Round columns can also be made by using units of different shape, each unit having an inner surface which is a section of a cylinder with its flanges projecting on radii of the cylinder;

Fig. 11 shows a somewhat diflerent form of girdle which has the advantage of being lighter in weight than the girdle construction above described and still operating in essentially the same manner. In this arrangement each pair of girdle bars 19 and 20 are connected together at one corner of the form by a pivot pin, bolt or rivet 21 so that these two members can swing. The two pivots 21 are arranged at diametrically opposite corners. At the other corners the

bars

19 and 20 overlap and these overlapping por tions are provided with slots 15 like those formed in the girdle bars previously described. Preferably a yoke 22, Fig. 12, is used at each of these corners to embrace the bars, the yoke being open at one side to permit the bar 20 to pass through it and having a slot 23 at its opposite side to permit the end of the bar 19 to pass through. A diagonal slot is provided in this yoke toreceive the corner wedge 16 which is guided in the yoke and is driven through the registering slots 15 of the two

bars

19 and 20 so as to tighten the girdle about the form in the same manner as in the construction above described. 7

These and other modifications may be made within the spirit and scope of the invention.

Having thus described my invention, what I desire to claim as new is:

1. A form for making flat sided concrete columns, comprising a plurality of sheet metal units of channel section extending longitudinally of each side of the form to support the sides of the column, additional sheet metal units of angular section extend ing longitudinally of the form at the corners of the column, said channel units being arranged edge to edge with their flanges in lapping v be brought into register, wedges located in the registering slots and cooperating with being arranged with one flange abutting the flange of a channel unit in each of two sides 7 of the form, said flanges being slotted to 2. A form for making flat sided concrete columns, comprising a plurality of sheet metal units of channel section extending longitudinally of each side of the form to support the sides of the column, additional sheet metal units of angular section extendthe form at the coring longitudinally of ners of the column, said channel units being arranged edge to edge with their flanges in abutting relationship, and said angular units being arranged with one flange abutting the flange of a channel of the form, means for removably fastening the flanges of said units throughout itssides and at the corners, rigidly together, thereby to provide a normally self-sustaining form, and girdles encircling said form and spaced longitudinally thereof, each of said girdles comprising bars bearing against the outer edges of said flanges, and means for tightening said girdles about said form.

3. A form formaking concrete columns, comprising a plurality ofsheet metal units extending longitudinally of each side of the form for supporting the sides of the column, means connecting the units of each side toabutting relationship, and said angular units unit in each of two sides gether, andmeans connecting each complete side to an adjacent side by to: provide a normally self-sustaining form, a irdle encircling said form and comprising bars bearing edgewise against the of the form, there sides of the form, said bars having inclined slots formed therethrough, the slots in over portions of the bars being adapted to the bars to crowd them against the sides of the form and thereby to tighten the girdle around the form, and a yoke embracing the overlapping portions of a pair of said bars said yoke being slotted to receive and guide the wedge which acts on said overlapping portions of said bars.

l. A form for making flat sided concrete columns, comprising a plurality of sheet metal units extending longitudinally of each side of the form for the column, means supporting the sides of connecting the units of each side together, and means connecting each complete side to an adjacent side of the form,

thereby said form and edgewise against said bars being overlapped upon each other at corners of the form and having diagonal slots formed to provide a normally self-sustaining form, and a girdle encircling comprising bars bearing the sides of the form,

through them and arranged to be brought into register with each other, the registering slots at said corners of the column being directed, respectively, toward the corners of the column, wedges in said registering slots for tightening the girdle around the form,

and a yoke embracing the overlapping portions of a pair of said bars and slotted to receive and guide the wedge which acts on said overlapping portions of said bars.

5'. A form for making fiat sided concrete columns, comprising a plurality of sheet metal units extending longitudinally of each side of the form for supporting the sides of the column, means connecting the units of each side together, and means connecting each complete side to an adjacent side of the form, thereby to provide a normally selfsustaining form, a girdle encircling said form and comprising bars bearing edgewise against the sides of the form and having portions overlapping one on the other, slots formed diagonally in said bars in such positions that the slots in overlapping portions of th-e'bars may be brought into register with each other at a corner of the form, wedges located in said registering slots and cooperating with the overlapping portions of the bars to tighten the girdle on the form, yokes cooperating with the overlapping portions of each pair of bars at certain corners of the form, each yoke being open at one side to receive one bar and slotted at its opposite side to permit the end of the other bar to pass through it, and having a second slot to registe'r with said diagonal slots in said overlapping portions of the bars to receive and guide a wedge extending through the slots in said yoke and said overlapping portions of the ars.

'6. A form for making flat sided concrete columns, comprising a plurality of sheet metal units of channel section extending longitudinally of each side of the form to support the sides of the column, additional sheet metal units of angular section extending longitudinally of the form at the corners of the column, said channel units being arranged edge to edge with their flanges in abutting relationship, and said angular units being arranged with one flange abutting the flange of a channel unit in each of two sides of the form, means for removably fastening the flanges of said units throughout its sides and at the corners, rigidly together, thereby to provide a normally self-sustaining form, girdles encircling said form and spaced longilocated in registering slots and cooperating with the bars to crowd them against the sides of the form and thereby to tighten the girdle around the iorm.

7 A form for making flat sided concrete columns, comprising a series of sheet metal units of channel section extending longitudinally of the form to support the sides of the column, additional sheet metal units of angular section extending longitudinally of the form at the corners of the column, said units being arrangededge to edge with their flanges in abutting relationship, and means for removably fastening the flanges of said units rigidly together.

8. A form for making concrete columns, comprising a series of sheet metal units extending longitudinally of the form to support the sides of the column, having marginal fianges'extending longitudinally thereof and projecting backwardly away from the column, said flanges being slotted to receive slotted keys, and wedges located in the slots of said keys and cooperating with them to secure the abutting flanges of adjacent units rigidly but releasably together.

FRED V. SGHUBERT.

tudinally thereof, each of said girdles comprising bars bearing edgewise against the outer edges of said flanges and overlapped upon each other at corners of: the form, said bars having inclined slots formed therethrough with the slots in overlapping portions of the bars being adapted to be brought into register with each other, and Wedges each of said units CERTIFICATE OF CORRECTION.

Patent No. 1,871,919. August 16, 1932.

FRED V. SCHUBERT.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Pagel, line 98, for "show" read shown; page 3, line 72, "claim 1, for "through" read throughout; and that thevsaid Letters Patent shouldbe read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 29th day of November, A. D. 1932.

M. J. Moore, (Seal) Acting Commissioner of Patents.