US1480010A - Method of casting cement or fibrocement under pressure - Google Patents

Description

Jan. 8 1924. v 1,480,010

E. w. ROBERTS ET AL METHOD .OF CASTING CEMENT OR FIBROCEMENT UNDER PRESSURE Filed Jan. 6, 1922 2 Sheets-Sheet 1 Jan. 8,1924. 1,480,010

, E. w. ROBERTS ET AL...

METHOD OF CASTING CEMENT OR FIBROCEMENT UNDER PRESSURE Filed Jan. 6. 1922 2 Sheets- Sheet 2 Patented Jan. '8, 1924.

OFFICE.

EDWARD WILLIAM ROBERTS, 0F WATFORD, AND LOUIS FREDK. WM. LEESE.

or LONDON, ENGLAND.

METHOD or cAs'rme CEMENT on EIBEocEMENT UNDER PRESSURE.

, Application filed January 6, 1922. Serial No. 527,293.

vented a certain new and useful Improvement in Methods of Casting Cement or Fibrocement under Pressure, of which the following is a specification.

This invention-relates to an improved method of casting cement or fibro-cement under pressure adapted forhollow castings.

cement or fibre-cement mixture.

The improved method consists in introducing int-o the'casing or mould provided with an extensible core or cores of the de-' sired form the mixture of the cement-or fibro-cement containing liquid in excesstov that which would produce a good setting mixture and then causing the core or cores to be expanded so as to force out excess liquid and to compress between the mould or casing and the core or cores the cement or fibro-cement mixture.

In the accompanying drawings is shown by way of example means suitable for carrying the method into effect and examples of castings'which may be formed by this method. Referring to the drawings, Fig. 1 is a perspective view showing diagrammatically a collapsible casing or mould in open position for the introduction of a series of expansible core members also shown. Fig. 2 is a detail View of one end of the casing or mould in closed position. Fig. 3 is a-perspective view of one of the expansible core members shown in Fig. 1. Fig. 4 is a detail view showing in section the casing and one expansible core member in position therein with the core member expanded and compressing the surroiirnding ig. 5 is a detail view in perspective of an expansible liner for use as hereinafter explained. Fig. 6 shows a form of casting in perspective capable of being made of the improved method, and by the apparatus illustrated. Fig. 7 is a perspective vlew of another form of casting which can be made by the im proved method of the present invention.

Referring to the drawings and particw larly to Figs. 1 and 2 a denotes the casing or mould the top and sides of which are hinged or otherwise arranged so as to swing aside to permit the insertion of expansible cores 6 V suitably; momntted on a carriage c, the core ends d in the form shown bein arranged to form when in position one si e wall of the casing or mould, the other side wall 03 being formed with openings adapted to be entered by the free ends 6 of the cores and to be held in upright osition by suitable means when the casing is Closed. These expansible cores, as indicated in Figs. 3 and 4, comprise a rigid support f surroundedby a rubber or other envelope 9 between which and the rigid support air maybe supplied under pressure through a pipe h. In the arrangement shown in Fig. 1 employing. a plurality of cores all of the pipes h areconnected to a common source of compressed air. In carrying the method into effect the cores are brought into position in the easingand the casing bolted down tight by means of bolts 2'. The casing is then filled with an easily flowing poor setting cement or fibro-cement mixture air is supplied by the pipes in to the spaces between the rigid core members and the flexible envelopes g whereby such flexible envelopes are caused. to expand so as to mould under pressure the cement or the fibro-cement mixture to the desired form. Channels are formed in the casing or mould through which the excess water may be expelled, the completed casting or moulding then-containing only the amount of water requisite for a good setting cement. The channels consist of holes punched in the inner and outer mold members and are shown in the drawings by black dots in Fig 1. I

In order to permit of easy and speedy removal of the casting or moulding from the casing ormould without liability of damage to the casting we preferably provide around the exterior of the expansible envelope g a. V/

C msnpw core member said core member consisting of 1 a rigid SUPPOIL and an expansible envs10%s e surrounding said support and adapted to supplied with air under pressure, and a, liner said liner including ozverlappin lengths of sheet metal or the like shape to correspond with the internal form of the casting to has produced substantially as and. for the i purpose set fonth.

In testimony whereof We'have signed our names to this specificatlon in the presenns of two subscribing Witnesses.

EDWARD WELLIAM ROBERTS. LOUIS FREDK. WM. LEESE.

Witnssses HAROLD 1F AIMRATHEB, 1E. WREN.

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