B - Operations – Transporting – 24 – C
Patent
B - Operations, Transporting
24
C
51/2
B24C 3/06 (2006.01) B24C 3/32 (2006.01)
Patent
CA 1232760
SPIN BLASTER ABSTRACT OF THE DISCLOSURE Apparatus for blast-cleaning the interior surface of a pipe includes a main housing that travels the length of the pipe, and rotatably supports a blast nozzle. A nozzle support shaft journaled in bearings carried by the housing, rotates freely, reactively to the force exerted within the nozzle by a carrier fluid, which is forced through the nozzle under high pressure, thus causing the nozzle, and hence the nozzle support shaft, to rotate at high speed within the housing. The carrier fluid is usually compressed air. Since it is directed through a non-rotating conduit to the rotating support shaft, a gasket is interposed between the rotating and non- rotating components of the apparatus. To prevent the carrier fluid and the abrasive media carried thereby from penetrating the shaft support bearings of the housing with obviously destructive effects, a gap is maintained between the housing and a junction housing in which the non-rotating conduit is mounted. The almost inevitable leakage that does occur past the gasket is dispersed to the ambient atmosphere through the gap, before it can impinge upon the bearings in which the shaft is journaled. The non-rotating conduit is threadedly advancable within the junction housing, so as to correspondingly, selectively adjust the extent to which the gasket is compressed, thereby permitting swift take-up for wear of the gasket without detracting from its capability for dispersing the abrasive media to ambient atmosphere when leakage does occur. In each position to which the conduit is selectively adjusted, it can be locked, so as to preserve the selected, adjusted compression of the gasket. -2
473377
Empire Abrasive Equipment Corporation
Gowling Lafleur Henderson Llp
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