US1499762A - Centrifugal manufacture of reenforced-concrete pipes and the like - Google Patents

Description

Jul 1, 1924. 1,499,762

. H. CONRADI CENTRIFUGAL MANUFACTURE OF REENFORCED CONCRETE PIPES AND THE LIKE Filed Jan. 15. 1924 Harr Conrad/ |NVENTOR;

4 Attorney.

Patented daily 11, 192%.

UhliTEfi STATEg HARRY CONRADI, 0F TOORAK, AUSTRALIA.

GEN'IBIFUGAL MANUFACTURE OF .REENFORGED-GONCRETE PIPES AND THE m.

Application filed January 15, 1924. Serial No. 686,279.

To all whom it may concern:

Be it known that I, HARRY CONRADI, a subject of the King of Great Britain and Ireland, residing at 1A Woodside Crescent, Toorak, in the State of Victoria, Commonwealth of Australia, have invented certain new and useful Improvements in the Centrifugal Manufacture of Reenforced Concrete Pipes and the Like; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to the production centrifugally of reenforced concrete pipes and like articles of plastic material. In many such ipes hitherto made the reinforcement is embedded undulyeccentrically, and does not ensure sufiicient strength and durability, but my pipes have not that defect, and will resist hi h pressures and heavy stresses.

This escription refers to a pipe by way of example, and similarly to concrete as the plastic material. One feature of my invention is that the reinforcement is temporarily held in correct position for becoming embedded by the concrete, the temporary holding means bein removed when the concrete holds the rein orcement by partly embedding it. The reinforcement will then be, when desired, concentric or nearly so within the mould. By adding concrete within the partly made pipe and using centrifu al motion, the reinforcement will then ecome fully embedded, and the pipe will be interiorily thickened to any extent desired.

To carry this invention into effect suitable known means will be used by which to apply centrifugal motion to the concrete.

For brevity I refer hereinafter to the reinforcement as a cage; it may consist of, and is herewith illustrated as of, spirally wound and ion itudinal wires. It will have any desired iameter and dimensions according to the concrete body to be made. I use for holding the cage, means {termed a core) positioned longitudinally within the ca e. My construction will now be described relatively to the accompanying drawings, but some of the details shown may be 1:"; odified while retaining any matter hereinafter claimed. These drawings are partly diagrammatic.

Figure 1 is a longitudinal sectional plan of parts of a mould, cage, and core ready for rotation and reception. of ccncrete.

Figure 2 isan end elevation partly in vertical section of the construction in Figure 1.

Figure 3 is a perspective view of part of a core bar.

Figure 4 shows in vertical section a frag ment of the mould, and of a partly completed pipe and part of the cage, without the core.

Figure 5 shows in vertical section a fragment of a completed pipe, with the cage embedded.

The core contains a plurality of spaced apart, longitudinal adjustable outer members 1 of bar form, and broadening inwardly. I show four bars extending along the mould interior.

2 is a mould, and 3 is part of a cage, one of spirally wound wire being shown with, at intervals along the cage, bearing rings 3, and at intervals circumferentially' longitudinal rods 3". Each end of the mould carries a known ring 4. These rings act as stops at the ends of core bars 1, which have recesses 1 in which a ring 4; fits.

The core bars can be retracted to inner positions, but in their outer positions shown by Figure 1, each bar bears against the cage interior, holding the cage, temporarily in place prior to the introduction of the concrete.

The core bars have pivoted to them links 5, 5 which move inpairs, and to facilitate such pivoting I provide lugs 1 on the bars.

Suitable links 5 have inner ends connected pivotally to slidable members 6, hereinafter termed sleeves, while other suitable links 5 have inner ends connected to a longitudinal central member 8 shown as a tubular spindle. The sleeves 6 enclosethe stem 8, and are connected longitudinally by rods 7, so that the sleeves and connecting rods slide as one. To facilitate pivoting links 5* to the sleeves the latter have lugs 6*. To facilitate connection of ends of rods 7 to sleeve members I rovide any suitablelugs 6 carried byglan' mem- 5 be swung on their pivots, and will shift bars 1 outwardly or inwardly. 1n the former case the bars Will be caused to press the cage interiorso as to securely and correctly hold it in the mould for rotation purposes. @n the core bars are lugs l which, during the said pressure, meet the mould interior,: preventing the bars being located too near the mould, and preventin. the cage approaching the mould so as to come eccentric thereto, unless negligibly.

I prefer that the core bars have recesses 1 in which Will fit cage rings 3*. 3 shows a part of the cage displaced to clear a lug i Thus the bars are made to hold'the cage When required concentrically Within the mould.

9 is a nut having rotation means 9, and having a retaining collar 9 lined to a sleeve member 6, the nut being mounted on a screw threaded end 8 of stem 8. Rotation of nut 9 causes the stem to move lugs 8 and links 5, whereby links 5 are also moved, and the bars 1 are set inward towards or outward "from the central stem.

When a cage is held concentrically as describedin a mould, centrifugal motion Will, when concrete is supplied, cause the concrete to consolidate against the mould interior, and extend from the mould to the cane, and firmly hold the latter to form a tu' ular shell 12 01"" the thickness indicated in igure 4, or thicker. Then by the described means the core bars 1 will be retracted towards stem 8, and the core Will be removed from the cage. Then the shell 12 is made thiclrer by introducing further con crete and applying centrifugal til the desired pipe thickness has been produced, indicated at 12.

It is not a part of this invention to finish the pipe surfaces, but it smooth finish be required suitable known methods are available.

What I claim is:

1. ln the manufacture or reentorced concrete articles, holding a reinforcing cage concentrically in a mould by pressure of longitudinal adjustable members of bar type of a core, forming a concrete shell Within the mould by centrifugal motion so that the shell maintains the cage in the said position, retracting the core members, adding concrete, and applying centrifugal motion, thereby embedding the cage to the'extent required.

2. A core for temporarily holding a reinforcing; cage concentrically Within a mould motion, un

incense to allow of embedding the cage in concrete by centrifugal motion, the core having a plurality of adjustable longitudinal be with means to bear against the mould, and means to bear against the cage, the ham being connected to central means Which is justable to move the bars into expanded or retracted position.

8. A core for temporarily holding reinforcing cage concentrically Within a mount to allow of embedding the cage in concrete by centrifugal motion, the core having a plu rality of adjustable longitudinal bars e means to bear against the mould, and to bear against the cage, the bars being connected by pivoted arms to a central adjt. t ble stem, and by other pivoted arms to devices near the stem, and relatively to which the stem is movable, whereby the bars be moved into expanded or into retracted position.

4-. A core for temporarily holding a re" forcing cage concentrically Within a motto allow of embedding the cage in concrete by centrifugal motion, the core having a n rality of adjustable longitudinal bars W n means to bear against the mould, and means to bear against the cage, the bars being cc nected by pivoted arms to a central adjus ble stem, and by other pivoted armsvvhi connect the bars to stem enclosing sleeves which are connected to one another, the es tral stem being movable relatively to sleeves and having means for longitudin adjusting it to cause movement of the co e bars outwardly to the cage, or invva-i c therefrom.

5. For centri'fugally moulding reenforcei 1 concrete articles, a tubular mould, a cave therein, a core having longitudinal bars l spective parts of which press outvvad against the mould and against the cage, d hold thenlatter concentrically in the moul central stem, connected sleeves protected glands enclosing the stem, pivoted links connecting the longitudinal bars and the s pivoted links connecting the longitudi bars and the sleeves, and screvv devices i longitudinally adjusting the stem relatively to the sleeves, thereby adjusting the said longitudinal bars.

1 ln Witness whereof l have hereunto set my nand.

CQN'RAlDlI Witness:

G-noncn G. inliar.

Images