US2046123A - Mold form for circular concrete walls - Google Patents

Description

June 30, 1936. w JENNINGS 2,046,123

MOLD FORM FOR CIRCULAR CONCRETE WALLS Filed Jan. 7, 1955 0O QO /2 00 (DO M131 00 CO I @y W i/3% Patented June 30, 1936 UNETE STATES PATENT OFFEQE MOLD FORM FOR CIRCULAR CONCRETE WALLS Application January 7, 1935, Serial No. 613

2 Claims.

In the art of mold forms for concrete walls it is at the present time customary to provide such mold forms consisting of rectangular panels which may be made of sheet metal but 5 which are strengthened and reinforced on all edges by braces to thereby give rigidity to the form. It is also customary to provide in these flanges symmetrically arranged centering openings so that the form members may be securely 1e and rigidly clamped together at their edges by means of a centering pin and clamp device. One instance of such form members and centering pin and clamping device is illustrated in my copending application Serial No. 673,214, filed May 27, 1933.

With form members of the kind just mentioned, and in the event that a circular concrete wall is to be molded, it is the present custom to provide specially designed mold forms for this purpose and not to employ rigid rectangular mold forms in such circular construction.

The object of my invention is to provide a supplemental mold form member of extremely simple and inexpensive construction, and designed to co-act with, and form an integral part of, a series of said rigid rectangular mold forms, and at the same time render the entire mold, consisting of a series of said rigid forms and a series of my improved auxiliary form members, capable of being bent at the auxiliary form members, so that the entire wall structure for the form may be shaped into a circle of almost any desired diameter, so that the major portion of a mold form for either a straight wall or a circular wall may be composed of said rigid rectangular form members, thereby effecting great economy in the first cost of the equipment necessary for the operator to build either straight or segmental walls, and greatly reducing the amount of time and labor necessary to erect mold forms for circular walls of different diameters.

A further object of my invention is to provide an accessory mold form member designed to be used in the same manner as that before mentioned, and shaped to form a mold form in a circular and cone shaped manner.

My invention consists in the construction of said auxiliary mold members and the manner in which they are combined with a series of rigid form members, and whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawing, in which:

Figure 1 shows a side elevation from the outer side of the mold forms, illustrating two ordinary rigid mold forms with my improved auxiliary bendable mold form inserted between them and firmly secured thereto.

Figure 2 shows an edge elevation of the perforated flange of my auxiliary form member.

Figure 3 shows a top or plan View of a mold having two spaced apart walls to receive concrete, and illustrating my improved auxiliary bendable mold members in position in said walls, arranged to construct substantially circular walls,

Figure l shows a perspective view of a centering pin and fonn clamping device of the kind used in connection with my improved mold members; and

Figure 5 shows a perspective view of a modified form of my improved auxiliary form member shaped for use in connection with cone shaped circular walls.

Referring to the accompanying drawing, I have used the numeral ill to indicate generally an ordinary rectangular metal form member having at all four edges thereof an outwardly extended flange ll. These flanges H are preferably provided with a series of symmetrically arranged centering openings 12.

In each of the mold form members ll) there is a series of slots l3 designed to receive spacing rods M, which rods are extended through the openings of one of the form members it and also through a similar opening in the opposed form member It], as illustrated in Figure 3, and pins l5 are extended through the outer ends of said spacing bars to thereby hold two opposed mold forms in properly spaced apart position and against outward movement such as would be caused by the pressure of the concrete between the walls.

For the purpose of connecting together the flanges I l of two adjacent mold forms, it is now customary to use a combined centering pin and r clamping device, such, for instance, as illustrated in Figure 4 and which consists of a handle l6 having a pointed centering pin ll at one end thereof, and two rigid spaced apart clamping jaws l8 projecting from the central portion of said handle.

In practice the two mold forms are placed in position substantially parallel with each other, then the operator grasps the handle it and forces the centering pin ll through the openings !2 of two adjacent flanges II, and then moves the clamping jaws I8 to position for engaging the outer surfaces of two adjacent flanges, so that by this means the two adjacent mold forms are rigidly locked together.

For the purpose of utilizing these same rigid mold forms in a circular or segmental concrete structure I have provided an auxiliary mold form member, preferably made of the same kind of sheet metal as the rigid mold form members and comprising a relatively narrow body portion l9 and two flanges 2i! extended at right angles thereto. There are no flanges at the top and bottom of the auxiliary member, and the entire space between the flanges 28 is free and unobstructed. These flanges '29 are provided with perforations 2!, in the manner shown in Figure 2, similar to the perforations l2 inthe rigid forms, and they are connected with the adjacent flanges of the rigid forms by means of the centering pin and clamping device illustrated in Figure 4, or in the same manner in which the flanges of the rigid form members are connected together.

With my improved auxiliary mold form mem-. her, and assuming that it was clamped in the manner described, between two rigid form members, then, asrillustrated in FiguregS, the two rigid form members may be readily and easily moved to the position shown Figure 3, thus bending the body portion l 9 of the auxiliary form member, and this may be bent to. an arc of almost any desired size, and at the same time the complete mold form will have all the necessary rigidity and strength.

Obviously, when a circular structure is to be built, the inner 'form member will be of less diameter and consequently shorter in length than that of the outer form member, and, yet, his necessary and desirable that the inner rigid panels should he arranged substantially in line radially with the outer rigid panels, so that the sp cing rods l may be successfully employed.

I have found in practice, however, that it is not essential that these spacing rods be exactly radial,

, and for the purpose of bringing them, in a circular wall construction, to the desired position for successful operation, I have. found, in practice, that at intervals throughout the outer wall I may employ two. of the narrow auxiliary bendable mold form members, as illustrated at the topof Figure 3.

When it is desired to have. a circular cone shaped structure I employ a modifiedfcrm of my invention, illustrated in Figure 5., in which this auxiliary bendable mold form member is shown to be tapered in width from'a maximum at one end, towards the other end, and I have found in use that with this tapered member a circular cone shaped wall may be readily, quickly and easily constructed.

In practical use with my. invention I havev demonstrated that considerable economy is efiected, because a contractor need only ship to the point of erection a desired quantity of rigid rectangue lar forms and a relatively small and inexpensive quantity of my improved auxiliary bendable form members. Then. at places where the concrete walls are to be relatively straight the rigid form members are employed in the usual manner, and at the. places in the structure. where. the. walls are to be circu ar or segmental or tapered, I erns ploy comparatively small number of my improved auxiliary bendable mold members in the manner described; and since these. auxiliary mold members are provided with the same flanges and perforations as the rigid mold members, the same centering. and clamping devices may be employed.

improved bendable members may be reused just as much as the rigid form members, be-- cause when taken apart the bendable portion may be readily and easily straightened and again rebent, if necessary, at greater or less are.

When it is desired to make a. cone shaped concrete structure,the tapered bendable mold forms are employedin the same manner as aforementioned with regard to the rectangular. andauxiliary mold members.

Another advantage of my improvement in mold forms is, that the auxiliary panel members may be freely bent'in both directions, hence, the same kind of auxiliary panels may he used on the inner surface. of a circular wall and on the outer surface of a circular wall, dueto the fact that there are no transverse braces on said auxiliary panel members- Furthermore, by making the auxiliary panel members relatively narrow and inserting them between standard sized panels the upper and lower flanges of the adjacent standard sized panels may be clamped together in the usual manner and will form a sufliciently rigid mold without any attachment at the top and bottom of the auxiliary panel members.

' I claim as my invention:

1. In a mold for curved concrete forms, the combination of two form panels, each made of sheet, metal with its. edges bent outwardly at sub stantiallyright angles tothe frame body and connected together at the corners for forming sub stantially rigid panels, said flanges being formed with pin receiving openings, a relatively narrow panel member formed of sheet metal and having its side edges formed with outwardly extended flanges, the body portion between said flanges being free from transverse braces and readily bendable in reverse directions between said flanges, the openings of the flanges of the narrow panel being arranged to align with the said openings in the side flanges in the rigid panels, and pins passed through said openings in said flanges for aligning; the panels.

2. In a mold for curved concrete forms, the combination of two form panels, each made of sheet metal with its edges bent outwardly at substantially right angles to the frame body and connected together at the corners for forming substantially rigid panels, said flanges being formed with pin receiving openings, at relatively narrow panel member formed of sheet metal and having its side edges formed with outwardly extended flanges having pin openings, the body portion between said flanges being free from transverse braces and readily bendable in reverse directions between said flanges, the openings of the flanges of the narrow panel being arranged to align with the said openings in the side flanges in the rigid panels, pins passed through said openings in said flanges for aligning the panels, and clamping means applied to said flanges for'firmly holding 6 7 WILLIAM 7 JENNINGS.

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