NOZZLE OF A SAND BLASTER FOR DUST-FREE BLASTING OF PLAIN SURFACES

Abstract: A nozzle for a sand blaster for dust-free blasting of plain surfaces comprises a tubular housing (1) with a revolving nozzle head (3) which is connectable to a blast hose (2). The nozzle head (3) is covered whith an end plate (4) provided with inclined orifices (7) so that the nozzle head (3) will be revolved by the throw of the sand blasting material. For a better adapatability to different demands for cleaning, each orifice (7) is provided with a slewable blast pipe (9) which is mounted slewable with a socket joint (10) at the end plate (4).

Description: Nozzle of a sand blaster for dust-free blasting of plain surfaces The invention relates to a nozzle of a sand blaster for dust-free blasting of plain surfaces comprising a tubular housing connectable to a blast hose and provided with a re¬ volving nozzle head diffuserlike enlarged and covered with an end plate which is provided with inclined orifices, so that the nozzle head is revolved by the throw of the sand blasting material. For dust-free sand blasting of plain surfaces, sand bla¬ sters are known which are provided with a hood mounted on the nozzle head for covering the blasted area and compri¬ sing installations for sucking off the blasting material and the dust. The nozzle head is provided with a venturi nozzle which directs the sand blasting material resp. abra¬ sive in a conical shape against the surface to be blasted. The nozzle head ist moved over the surface strip by strip. For a revolving drive of the nozzle head, but avoiding an additional motor, a blast nozzel is known from DE 38 34 896 C2, the end plate of it is provided with inclined orifices so that the diffuserlike enlarged nozzle head ist revolved by the throw of the abrasive-air-mixture. For adjustment to more or less wide blasting strips and /or blasting effects on the surface to be blasted, the disadvantage is that se¬ veral end plates of different design provided with appro¬ priate orifices must be available and storaged. Therefore the object of the invention is to develop a blast nozzle corresponding to the preamble of claim 1 in such a way, that higher adaptability to the cleaning operations is possible. SUBSTITUTE SHEET This problem is solved in accordance with the invention by the means that each orifice is provided with a slewable blast pipe. In accordance with the invention, the blast pipes allocated to the end plate are adjustable into the most effective po¬ sition for cleaning operations. By a radial adjustment the width of blasted strip can be enlarged or reduced and by a tangential adjustment the inclination of the blasting may be changed. Depending on the nature of the material to be blasted and the pollution the best adaptability can be achieved by adjusting the blast pipes. Where, e. g. a hard coat of dirt is to be blasted, an appropriate hard blasting of the surface is adjustable. The bearing of the blast pipes on the end plate may be made in different ways. Preferably, the blast pipe is carried slewable by a socket joint at the end plate. At this, a pipe socket provided with a ball cup for the socket joint may be attached at the edge of each orifice. Besides of that, the socket joint preferably is provided with faste¬ ning devices which fix the blast pipe in the adjusted sle¬ wing position. The drawing illustrates an example of the invention; it is shown in Fig. 1 a side view of a blast nozzle for dust-free blasting of plain surfaces, Fig. 2 a frontal view of the subject of Fig. 1 and Fig. 3 a central cross section of the subject of Fig. 1 wherein, for a better representaion, the cut blast pipe is shown in a displaced position. The blast nozzle for sand blasters for a dust-free blasting of plain surfaces as shown in Fig. 1 substantially consists of a tubular housing 1 with an equipment for connecting a blast hose 2. At the front a nozzle head 3 is provided which is enlarged diffuserlike. The nozzle head 3 is provi¬ ded with an exchangeable end plate 4 which is fastened by appropriate fixing devices, as screws and the like. Fur¬ thermore, but not shown in the drawing, the blast nozzle is provided with a hood that is supplied with suction instal¬ lations. As shown in Fig. 3, the conical nozzle head is provided with a collar 5, which is mounted revolvingly on the hou¬ sing 1 by means of a rolling bearing 6. The blasting mate¬ rial, consisting of the carrier gas with the abrasive sand or other particles, is blown through the blast hose 2 into the nozzle head 3. The end plate 4 mounted in the frontal opening of the nozzle head 3, is supplied with four incli¬ ned drill-hole-like orifices 7, which are arranged trans¬ verse through the head plate 4 in one rotary direction. The axes of these inclined orifices 7 run in such a way that a revolving resp. rotation of the nozzle head 3, in direction of the arrow shown in Fig. 2, is effected. As shown parti¬ cularly in Fig. 3, a pipe socket 8 is attached at the edge of each orifice 7. Each pipe socket 8 forms a support for one blast pipe 9. For a slewable bearing each blast pipe 9 is provided with a socket joint 10, that is slewable in a ball cup 11, allocated to the collar 8. An adjusting nut 12 permits the fixing of the blast pipe 9 in its adjusted position. The pipe sockets 8, allocated to the orifices 7, are fixed in the same inclined position as the corresponding orifices 7, as shown particularly clear in Fig. 2. On the other hand, the blast pipes 9 can be ad¬ justed individually by means of the socket joint 10. Both, the number of blast pipes 9 allocated to the nozzle head 3 and the slewable bearing at the end plate 4, may be applied in different versions. It is possible, e. g. to use a simple swivel bearing instead of a socket joint, whereby bearing necks can be provided at the blast pipe 9, which are placed in the corresponding drills of the pipe socket 8 or of the orifice 7. The slewing axis of such a bearing can lie in different ways, with regard to middle axis of the discoid end plate 4, in an inclined position, if possible, but also in positions where the slewing axis is arranged radial or tangential. The orifice 7 can have other profiles as well instead of a cylindric one.

Claims: AMENDED CLAIMS [received by the International Bureau February 1994 (22.02.94); original claims 1,2 and 4 replaced by amended claim 1; original claim 3 renumbered as claim 2 (1 page)] (Amended) Nozzle for a sand blaster for dust-free bla sting of plain surfaces comprising a tubular housing (1 connectable to a blast hose (2) and provided with a re volving nozzle head (3) diffuserlike enlarged and cove red with an end plate (4) which is provided with incli ned orifices (7), so that the nozzle head (3) will b revolved by the throw of the sand blasting material characterized in, that each orifice (7) is provided wit a slewable blast pipe (9) mounted at the end plate with a socket joint (10) and that the said socket join (10) is provided with fastening devices for fixing th blast pipe (9) in the adjusted slewing position. (Original claims 1,2 and 4) Nozzle according to claim 1, characterized in that a the edge of each orifice (7) a pipe socket is provided forming the ball cup (11) of the socket joint (10). (Original claim 3) AMENDED SHEET(ARTICLE1) STATEMENT UNDER ARTICLE19 In US,A,1,944,404 is described a rotary abrasive blast gun whic rotates by the power obtained from the reaction of the blast. T the lower end of a rotary element are connected branch conduits which are provided with elbows and nozzle members. In order to ad just the speed of rotation the angle between the nozzle and th main axis of the sand blast gun may be changed by rotating of th elbows about its screw threads in regard with the branch conduit or by rotating the nozzle about its screw threads in regard wit its fastening to the elbows. But in practise, an exact adjustmen of the nozzle is not available because of the high pressure of th mixture of abrasive particles. If the screw threads are not fixe fast the uncovered parts of the screw threads will be abrasived an the nozzles are allowed to rotate uncontrolled and in a worse cas the nozzles may rotate out of it screw threads. The present invention avoids the said disadvantages and allows higher adaptability to the cleaning operation by the means as spe zified in the amended claim 1.

Inventors: KIESS KARL HEINZ, KIESS, KARL, HEINZ
Applicants: KIESS KARL HEINZ, KIESS, KARL, HEINZ
Application year: 1993
Main classification: B24C5
IPC codes: B05B3, B05B15, B08B5, B24C5, B65B3