Patent ID: 8573706
Filing Date: 2013-11-05
Classification: E21C

Abstract:
1. An assembly comprising: a holder block and a sleeve; the holder block comprising a first flow passage, an outer periphery wall, a bore wall defining a first hole in the block wherein the first hole opens in the outer periphery wall, and a first fillet joining the bore wall and the outer periphery wall; the sleeve comprising a shank, a flange at an end of the shank, the flange having a shoulder, a second fillet joining the shank and flange, a nozzle bore in the flange, a second hole for receiving a cutter bit, and a second flow passage fluidly connected to the nozzle bore; the sleeve shank is received in the first hole of the holder block so that the sleeve shank faces the holder bore wall, the sleeve flange shoulder is entirely outside of the holder block, and the shoulder butts against and overlays the outer periphery wall; the first and second fillets cooperatively defining an annular flow passage there between, each of the first and second flow passages having an opening facing the annular flow passage to flow water from the first flow passage and through the annular flow passage to the second flow passage.