US1398236A - Collapsible core - Google Patents

Description

F. MEYER.

Y coLLAPslBLE com.

A P P L l C A T l 0 N F l L E D F E B I 7 1 9 2 0.

,398,236. Patented Nov. 29, 1921.`

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Specification of Letters Patent. i `pltilbll NDV- 29, 1.921.

Application filed `lebmlary 17, 1920. Serial` No. 359,219.

To all whom t may concern:

'Be it known that 1, FREDERICK MEYER, a citizen ofthe United States, andfresiding at East Northport, Long Island, in the county of Suffolk and State of New York, have invented certain new and useful improvements in Collapsible Cores, of which `the following is a specication, such as will enablethose skilled in the art to which it appertains to make and use the same.

rlhis invention relates to collapsible cores for use in concrete constructions of various kinds and classes, and particularly in the formation of bricks or blocks of concrete or similar material and providing `the same with vertical, transverse or other bores or passages preferably of cylindrical form in cross section, and theobject of the invention is to provide a collapsible core of the class and for the 1purpose specified lwhich `by reason of its construction will be strong and durable and may be quickly and easily detached from a concrete block or other body after said body has been 4formed or cast therearound, when said body has become hard or set; and with this and other objects in view the invention consists in a device of the class and for the purpose specified, constructed as hereinafter described and claimed. n

The invention is ,fully disclosed in the following specification, of which the accompanying drawing forms a part, in which the separate parts ofmy improvement are designated by suitable reference characters in each of the views, and in which Figure 1 is a central longitudinal section through a part of a concrete body or wall showing my improved core in connection therewith and indicating the method of its use;

F ig. 2 a transverse section on the line 2-2 of Fig. l;

Fig. 3 a view similar to Fig. 2 with part of the construction omitted and indicating the method of detaching the core from the concrete body or wall; and,

Fig. 4L an edge View of one of a number of reinforcing and locking links which I employ.

In the practice of my invention, I provide a collapsible core 5 which, in the form of construction shown, is tubular in form and is fashioned from sheet metal of predetermined length and width and of the desired thicknessor/gag'e. One side portion V6 of the `sheet from `which the collapsiblecore is formed,l is fashioned into a tubular bead 7 which extends the full length ofthe sheet as shown inF ig. 1, and said ysheet is provided where the bead 'Zjoins the side portion 6 with an offset or shoulder portion 8 in which the other side edge `9 of the sheet lits, as clearly shown in Fig. 2. rihis construction or connection of the'separate side portions 6 and 9 of the sheet forms a continuous andunobstructed outer face on the core 5.`

I also employ in connection with core 5,

or the tubejof which said core is composed,

two reinforcing ring members 10, one of which is shown in detail in Fig. e. rThe ring members 10 consist of acircular body member 11 having a central aperture 12, and provided `at their outer, edges `with ianges 13 which project at right angles lto the said ring members; yand the iianges 13 andthe body members 11 are cut out to form recesses 11i to receive the bead 7 when said ring membersare placed inthe core 5, or in position for use.

The ring membersy 10 are employed in connection with the end portions of the core 5 and are inserted into the core with the fianges 13 thereof directedy inwardly as shown in F ig.1,andserve to reinforce said end portions ofthe core and also serve to lock the core in position and to prevent the side edge portions 6 and 9 thereof 'from collapsing under pressure in the use of the device. The apertures 12 in the ring members 10 are provided to .permit of the placement of said members in the core 5 and the detachment of said members therefrom whenever desired.

n the use of my improved core the same is mounted in the usual mold or framework 15 shown in Fig. 1 to form the desired concrete body with the opposite end portions thereof projecting through said framework as shown at 16. 1t will be understood that the ring members 1() will be placed in position as shown in Fig. 1 prior to the pouring of the concrete` into the mold or framework 15, and after the concrete body Vhas been formed and the cement or other mixture hardened, the core 5 is removed by first withdrawing the ring` members 10 and then applying a suitable tool to the tubular bead 7 to force the side edge portion 6 of the core inwardly as shown in Fig. 3 thus permitting of the withdrawal of said core from the concrete body 17.

It will be understood that the core 5 will be composed of spring material and will normally assume the position shown in Figs. 1 and 2 by reason of its. spring qualities, and by means thereof concrete or similar building blocks may be provided in the formation thereof with vertical, transverse or other bores or passages, in a simple and efficient manner. Y

. Having fully described my invention, what I claim as new and desire to secure by Letters fatent, is

1. .A collapsible core for use in constructing concrete bodies and the like, said core comprising an open tube composed of spring material, one of the free side edge portions of said core being provided with an inwardly directed bead, a shoulder in connection with which the other side edge portion of the core operates to form a continuous core which is normally closed by the spring qualities thereof, and ring members adapted to operate within the core at the end portions thereof, said ring members being cut out to receive said beadand serving to lock the side portions of the core against inward movement. Y

2. A collapsible core for use in forming concrete bodies and the like, said core comprising a tube made of spring material and open at one side, one of the free side edges of said tube being provided with an inwardly directed bead, at the back of which-is a longitudinal shoulder in connection with which the other side edge portion of the tube operates when the core is in use, whereby said core is provided on its outer side with a continuous, smooth and unobstructed surface, and reinforcing ring members adapted to be inserted within the opposite end portions of the core; and being provided with recesses in their perimeters to receive said bead and serving to lock the side portions of the core against inward movement when the device is in use.

3. A collapsible core for use in constructing concrete bodies andthe like, said core comprising a tube of spring material open at one side, and one side edge portion of which is provided with an inwardly directed tubular bead at the back of which is a longitudinal shoulder, in connection with which the other side edge portion of the tube operates, and reinforcing end members adapted to be inserted into the opposite end portions of said core and comprising circular body portions provided with central apertures, and also provided at their perimeters with annular flanges which project at right angles thereto. d

4c. A collapsible core of the class described, consisting of a. spring metal tube open at one side and one side edge portion of which is provided with an inwardly directed bead at the back of which is a longitudinal shouldert

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