GB2224782A

GB2224782A - Placement of cement mortar

Info

Publication number: GB2224782A
Application number: GB8924090A
Authority: GB
Inventors: John Milton Beirne
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-11-10
Filing date: 1989-10-26
Publication date: 1990-05-16
Also published as: GB8826311D0; GB8924090D0

Abstract

There is disclosed a method for the placement of a cement mortar comprising the steps of providing a cement mortar having an added plasticiser, loading the mortar into a reservoir 10, applying pressure to the mortar in the reservoir to cause it to be expelled through manually movable nozzle means 12 connected with said reservoir. Used for pointing brickwork. <IMAGE>

Description

Placement of Cement Mortar This invention concerns the placement of cement mortar particularly though by no means exclusively, in small quantities in generally inaccessible positions such as is necessary in the repointing of brickwork for example.

It is a matter of common experience that the repointing of brickwork is a slow operation, even for the skilled workman, requiring considerable care to ensure that the mortar completely fills the voids between adjacent bricks, a task that is near impossible if the mortar mix is other than of optimun! consistency.

The present invention is based upon the discovery that if the cement mortar mix contains plasticiser as an additive it can be expelled from a cylinder through a nozzle of reduced cross-sectional area and hence injected to the required position.

Thus, according to the present invention there is provided a method for the placement of a cement mortar comprising the steps of providing a cement mortar having an added plasticiser, loading the mortar into a reservoir, applying pressure to the mortar in the reservoir to cause it to be expelled through manually movable nozzle means connected with said reservoir.

The reservoir may be remote from the nozzle means and connected therewith by a flexible hose.

The reservoir may comprise a cylinder having nozzle outlet means at one of its ends and a manually advantage piston means therein.

The invention also includes apparatus for practising the methods aforesaid.

It will be understood that the method of the invention enables a cement mortar mix to be injected from the nozzle outlet means directly into the void between the faces of adjacent bricks or the like n a repointing operation ensuring deep and effective penetration and with minimal or non-existant spillage of mortar from the workface.

The invention will be further apparent from the following description, with reference to the single figure of the accompanying drawing, which shows, by way of example only, one form of apparatus for use in practising the invention.

Referring now to the drawing, it will be seen that the apparatus comprises a cylinder 10 having at one end an externally threaded tubular outlet 11 adapted to receive one of a selection of internally threaded outlet nozzles 12 of varying diameter at their discharge ends.

The cylinder 10 is adapted to be located within a cage-like housing comprising an annular member 14 which receives the nozzle end of the cylinder with the nozzle 12 projecting therethrough and axial bars 15 extending rearwardly from the member 14 to a frame 16 formed integrally with first handle means 17.

A piston member 18 mounted on rearwardly extending rod 19 locates within the cylinder 10 and the rod 19 is axially slidable through spaced bearings 20 and 21 therefor, again formed integrally with frame 16.

Second handle means 22 is pivotally connected with frame and has abutment means 23 thereon which serve to push a plate member 24 surrounding rod 19 slidable relative to frame 16 forwardly in skewed relationship to the rod 19 to advance same and hence piston member 18 forwardly against the action of return spring means 25 whenever the second handle means 22 is squeezed towards handle means 17.

A further plate member 26 surrounds rods 19 and is pivotal relative to frame 16 and normally held in skewed relationship to the rod 19 by spring means 27 to prevent rearward movement of rod 19.

The plate member 26 may be pushed against the action of spring means 27 to lie perpendicular to rod 19 enabling the rod to be pulled by handle means 28 rearwardly to remove the piston member 18 from the cylinder 10.

In use, a cylinder 10 fitted with a nozzle 12 of desired outlet diameter is loaded with a quantity of cement mortar containing a plasticiser additive (such as Cormix SP1 supplied by Crosfield Chemicals of Warrington, Cheshire in an amount of 0.88 by weight) and fitted into the cage-like housing. The piston 18 is located in the open end of the cylinder 10 and the handle means 22 is pumped manually to expel the mortar mix through nozzle 12, the piston 18 acting directly upon the mortar load.

The nozzle 12 may be used to inject the mix into the deep crevicies such as the voids between adjacent bricks when repointing. The work may be finished if necessary with a conventional pointing trowel or brush or other instrument as desired.

As soon as the supply of mortar is exhausted the rod 19 is retracted to withdraw the piston member 18 to enable the cylinder 10 to be reloaded.

More than one cylinder may be used so that with two operators, one filling the cylinders and the other placing the mortar, the operation is virtually continuous.

It is envisaged that the apparatus described together with nozzles, spare cylinders, supplies of plasticiser and possibly a pointing trowel or brush might be sold as a kit, likely to be of particular interest to the D.I.Y. market.

It will be appreciated that it is not intended to limit the invention to the above example only, many variations, such as might readily occur to one skilled in the art, being possible, without departing from the scope thereof.

Thus, for example a flexible hose may be pushed onto the end of the nozzle enabling placement of the mortar in very restricted positions which cannot be accessed by the nozzle itself.

Again, for example, the mortar reservoir may be of extended capacity and not manually held, it then being connected with the manually movable nozzle means by a flexible hose.

Claims

1. A method for the placement of a cement mortar comprising the steps of providing a cement mortar having an added plasticiser, loading the mortar into a reservoir, applying pressure to the mortar in the reservoir to cause it to be expelled through manually movable nozzle means connected with said reservoir.

2. A method according to claim 1, wherein the reservoir is remote from the nozzle means and connected therewith by a flexible hose.

3. A method according to claim 1, wherein the reservoir comprises a cylinder having nozzle outlet means at one of its ends and a manually advancable piston means therein.

4. Apparatus for the placement of a cement mortar comprising a manually held cylinder adapted to be loaded with the cement mortar and having a nozzle outlet at one end thereof and a piston manually advancable in said cylinder to expel mortar therefrom through said outlet by direct engagement with the mortar load and retractable from the cylinder to enable the cylinder to be reloaded.

5. Apparatus for placing cement mortar substantially as described herein.

6. Apparatus for placing cement mortar substantially as described herein with reference to and as illustrated by the single figure of the accompanying drawing.