US2779990A

US2779990A - Supporting structure for a mould for a concrete structure

Info

Publication number: US2779990A
Application number: US279745A
Authority: US
Inventors: Bos Cornelis Van Den
Original assignee: Individual
Current assignee: Individual
Priority date: 1951-04-07
Filing date: 1952-04-01
Publication date: 1957-02-05
Anticipated expiration: 1974-02-05

Description

Feb. 5, 1957 c; VAN DEN BOS 2,779,990

SUPPORTING STRUCTURE FOR A MOULD FOR A CONCRETE STRUCTURE Filed April 1, 1952 l lo INVENTOR cme/veL/a 49 249v 30$ United States atent SUPPORTING STRUCTURE FOR A. MOULD FOR A CONCRETE STRUCTURE The present invention relates to a supporting structure for a mould for a concrete structure wherein the supporting surface can be dimensionally altered and is defined by a number of bars which are connected together in parallel relationship.

Such a supporting structure is generally known. However, in the existing structures, the connection of the bars consists of other rigid bars rotatably connected therewith, and an alteration in width always accompanies each alteration in length of the structure. It has appeared in practice that this may lead to undesired complications when preparing such supporting structures.

In order to obviate this drawback the supporting structure according to the invention consists in a mechanism permitting movement of the parallel, laterally extending bars toward and away from each other while maintaining the same distance between the two opposite sides of the supporting structure.

In a preferred embodiment according to the invention the mechanism connecting the bars to permit movement toward and away from each other consists in at least two elements of the lazy tongs type, with the centres of rotation of each set of crossing members of the lazy-tongs being connected to the parallel bars and the lazy-tong elements extending longitudinally in parallel, spaced-apart relationship.

In the drawings embodiments of the supporting structure according to the invention are indicated by way of example:

Figure 1 shows a plan view of a part of a supporting structure in partially drawn out position.

Figure 2 represents a cross section along the line II--H in Figure 1.

Figure 3 is a cross section along the line III--III in Figure 1.

Figure 4 is a lateral view of another embodiment.

Figure 5 is a plan view of still another embodiment.

In the drawings, the bars are indicated by the reference numeral 1. The bars 1 extend laterally and are connected to each other by longitudinally extending lazy-

tongs

2a and 2b. The centers of rotation 3 of the

crossing members

4 and 5 forming the lazy-tongs are located on the neutral axes of the lateral bars 1.

The

members

4 and 5 extend through openings 6 in the bars 1. Each of the bars 1 can also consist of two or more parts arranged. against each other, and each provided with registering recesses at the inside for the passage of the lazy tongs. a

The head ends 7 (Figure 3) of each bar 1 are provided with transverse recesses 8 into which the lazy-tongs of an adjacent similar oar system (not shown) can enter when the end portions of the bars in adjacent bar systems are overlapped.

ICE

In one embodiment (Figure 4) thin shields (9) are fitted on the bars 1 which shields overlap each other like tiles and so seal the openings between the various bars. it is to be understood that the bars 1 of Fig. 4 are also connected by lazy-tong elements, and that the shields 9 mer ly replace flat plates or boards that must be supported by the structure of Figs. 1 to 3 to define a mould.

In another embodiment members 10 (Fig. 5) are mounted perpendicularly to the bars 1 and, if desired, pass through openings in said bars.

These members 10 which e. g. are formed as strips, bridge over the openings between the bars 1 and give a better support to the covering material of the mould.

The above described supporting structures can be applied in rectangular planform as well as in the form of a parallelogram. Dependent upon the resiliency of the bars and/or the lazy tongs bent faces in the moulds can also be supported with the above described structure.

When using slightly resilient covering material the distance between the bars can be chosen as large as possible.

When using sheet-like material the bars can be connected in such a manner that no or only slight bending of this material is to be feared.

What is claimed is:

1. A supporting structure for poured concrete moulds; said structure comprising a series of spaced apart elongated bars extending laterally in the structure, and at least two laterally spaced independent lazy-tong elements extending longitudinally in the structure, each of said lazy-tong elements including sets of crossing members, and pivots connecting together said crossing members of each lazy-tong element at their opposite ends and at their intersections, the pivots of said crossing members at said intersections being also pivotally connected to said bars so that said bars are supported solely by said lazy-tong elements and can be moved toward and away from each other to vary the longitudinal dimension of the structure while maintaining a constant lateral dimension and so that the bars can be angularly displaced relative to each other to give said structure a fan-like configuration.

2. A supporting structure according to claim 1; wherei in said bars have slots therethrough through which said lazy-tong elements extend and wherein said lazy-tong elements are pivotally connected to said bars.

3. A supporting structure according to claim 1; further comprising shield members securedto each of said bars and spanning the gaps between the latter to overlap in one direction and define a surface of a mould for poured concrete.

4. A supporting structure according to claim 1; further comprising stiffening members extending at right angles from each of said bars and engageable with the next adjacent bar to stiifen the structure when said lazy-tong elements are extended. a

. References Cited in the file of. this patent