WALL CHASER FOR SiNKING CONDUITS IN WALLS The present invention relates to a wall chaser for sinking conduits in walls, which wall chaser consists of a cutter holder in which there is mounted an assembled diamond cutter which realizes a channel width of about eighteen millimetres and a channel depth of about twenty millimetres, which diamond ! cutter is driven by means of a right-angled gearbox with handle, which gearbox with handle is rotatable rotative to the cutter holder, wherein the cutter holder is operated during use with the periphery connecting to the wall and wherein the cutter holder is provided with a controllable water feed to which is connected a water chamber with inward ire4 « zihannels on one or more sides of the cutter holder, and with a water discharge system for discharging the grindings from the diamond cutter, which discharge system also functions as handle.

The cutting of channels in walls in order to sink conduits for repositioning is labour-intensive work where a great deal of dust is moreover released. The relatively wide channel is usually made by grinding two narrow grooves with a grinding disc, whereafter the'material therebetween is removed manually with a separate tool or with a vibrating chisel. The person carrying out this work must employ breathing protection because of the dust released during the grinding.

The invention has for its object to solve this problem by applying a wall chaser, of which the cutter holder is operated connecting onto the wall and which is provided with a water injection system which, in addition to cooling the cutter itself, also provides for discharge of the grindings.

Many embodiments of wall chasers are known from the patent literature.

However, none of these patents deals with the problem of dust-free discharge of the grindings during cutting in vertical walls. The American patent US 5651727 does relate to a wall chaser with water feed, although with the open arrangement of the water outflow as described, the method will not take place in dust-free manner.

The invention is further elucidated herein with reference to a number of figures. These figures do not however serve in any way to limit the scope of protection, but show a possible embodiment thereof.

Figure 1 shows schematically the structure of the wall chaser as seen from the wall.

Figure 2 shows a side view of the wall chaser in a position against a wall for

processing.

Figure 3 shows a cross-section through the wall chaser at a position between the right-angled gearbox and the assembled cutter blade.

Figure 4 shows a detail of another arrangement of the water chamber with outlet openings.

The watt chaser is constructed from a cutter hotder 1 in which is situated an assembled diamond cutter 2 mounted on a shaft 3, which shaft 3 is mounted on one side in cutter holder 1 by means of bearing 3a. Shaft 3 is driven by means of a right- angled gearbox with handle 4, wherein shaft 3 is mounted on the side of right-angled gearbox 4 in bearing 4a, while cutter holder 1 is mounted rotatably on right-angled gearbox 4 by means of bearing Ab and as indicated with arrows 4'in ffgure 2. The_ right-angled gearbox 4 also functions-as handle for-holding the wall chaser. Diamond cutter 2 can for instance be chosen such that it realizes a channel width of about eighteen millimetres and a channel depth of about twenty millimetres.

The cutter holder 1 is provided with a water connection 5 with controllable tap 5a, behind which distribution of the water takes place to a tube 6 which has an outflow opening 6a with the purpose of cooling the assembled diamond cutter 2, in addition to a water flushing system which is built up of a water feed tube 7 which connects onto a water chamber 8, which water chamber 8 admits the water via a plurality of openings 9 into the internal space of cutter holder 1, wherein this water takes up and discharges the grindings of the assembled diamond cutter 2 via the inclining bottom 1 a in cutter holder 1 to discharge pipe 10 which also serves as second handle for the wall chaser.

The operation of the machine is as follows.

At the top of the channel to be made for sinking a conduit in a wall the machine is set into operation, including the flow of water via connection 5, and the underside of cutter holder 1 is placed against the wall at the position where water chamber 8 is situated. Cutter holder 1 is then pressed wholly against the wall, as a result of which the assembled diamond cutter 2 cuts into the wall. The diamond cutter herein has a rotation direction toward the underside of the cutter holder 1 as indicated with arrow 2'in figures 2 and 3. Only after cutter holder 1 is situated with the whole periphery against the wall is the whole machine displaced in downward direction to further cut out the channel as indicated with arrow 1'in figure 2. The grindings created during this operation are carried by diamond cutter 2 in the direction of water chamber 8 with channels 9. The water flow directed inward through channels 9 takes up the grindings which are then discharged via the inclining bottom 1a of the cutter holder and the discharge pipe 10. In the case of a reasonably flat wall, the operation of discharging the grindings is not disrupted, even at an oblique angle of about forty-five degrees relative to the vertical. They'ils not limited to the exemplary embodiment wn} 0w. nd dUcribed in the foregoing. The types of drive can be varied in many ways within the scope of the invention. The handle of the right-angled gearbox 4 can have an etectnc motor or a pneumatic motor, or have a flexible shaft driven at a distence by a motor. l Wfotatable mounting of the discharge pipe 10 on cutt j ! !' discharge pipe 10 can be connéct idtV FdiMilWIl¢i The flushing openings 9 bom water chamber 8 can also be extended to the lower parts of the sides of cutter holder 1.

The invention is not limited in use in other situations or applications.