Hole saw breaching firefighting nozzle

A hole saw breaching firefighting nozzle, comprising:

• an outer housing substantially cylindrical in shape and centered about a central longitudinal axis, said outer housing comprising a flow reducer coupled to a downstream end of said outer housing;
• an inner housing concentrically disposed within and axially spaced from said outer housing to create an annular flow region between said outer housing and said inner housing, said inner housing comprising one or more gaps at an upstream end of said inner housing;
• a diffuser assembly, comprising:
• an end cap coupled to an upstream end of said outer housing and having a center opening and an annular space;
• an orifice plate disposed within said inner housing and comprising a plurality of orifices disposed in a radial configuration, said orifice plate being coupled to said end cap via a plurality of linear bearing shafts, such that said center opening and said orifice plate are disposed along said central longitudinal axis;
• and
• a flow control ring coupled near an upstream end of said inner housing and disposed between said orifice plate and said end cap, said flow control ring being adapted to slide forward or rearward when said inner housing moves forward or rearward in order to control fluid flow communication between said orifice plate and said annular flow region;
• wherein when said inner housing moves forward, said flow control ring slides forward and obstructs said plurality of orifices while permitting said fluid flow communication to said one or more gaps of said inner housing, and wherein when said inner housing moves rearward, said flow control ring slides rearward and permits said fluid flow communication to said plurality of orifices, said one or more gaps entering said annular space of said end cap and being obstructed;
• a drivetrain assembly substantially disposed within said inner housing and having an upstream end rotatably coupled to said orifice plate, said drivetrain assembly, comprising:
• a turbine;
• a planetary gearbox operably coupled to a downstream end of said turbine;
• and
• a mandrel operably coupled to a downstream end of said planetary gearbox;
• and
• a hole saw assembly operably coupled to said drivetrain assembly and rotatably coupled to said flow reducer;
• wherein said inner housing is in a sliding relationship with said plurality of linear bearing shafts and adapted to move forward and rearward with respect to said orifice plate and said flow reducer;
• and
• wherein a downstream end of said drivetrain assembly is in fluid communication with said annular flow region.

A hole saw breaching firefighting nozzle, comprising:

• an outer housing substantially cylindrical in shape and centered about a central longitudinal axis, said outer housing comprising a flow reducer coupled to a downstream end of said outer housing;
• an inner housing concentrically disposed within and axially spaced from said outer housing to create an annular flow region between said outer housing and said inner housing, said inner housing comprising one or more gaps at an upstream end of said inner housing;
• a diffuser assembly, comprising:
• an end cap coupled to an upstream end of said outer housing and having a center opening and an annular space;
• an orifice plate disposed within said inner housing and comprising a plurality of orifices disposed in a radial configuration, said orifice plate being coupled to said end cap via a plurality of linear bearing shafts, such that said center opening and said orifice plate are disposed along said central longitudinal axis;
• and
• a flow control ring coupled adjacently to said one or more gaps of said inner housing and disposed between said orifice plate and said end cap, said flow control ring being adapted to slide forward or rearward when said inner housing moves forward or rearward in order to control fluid flow communication between said orifice plate and said annular flow region;
• wherein when said inner housing moves forward, said flow control ring slides forward and obstructs said plurality of orifices while permitting said fluid flow communication to said one or more gaps of said inner housing, and wherein when said inner housing moves rearward, said flow control ring slides rearward and permits said fluid flow communication to said plurality of orifices, said one or more gaps entering said annular space of said end cap and being obstructed;
• a drivetrain assembly substantially disposed within said inner housing and having an upstream end rotatably coupled to said orifice plate, said drivetrain assembly, comprising:
• a turbine adapted to move forward and rearward with respect to said orifice plate;
• a planetary gearbox operably coupled to a downstream end of said turbine;
• and
• a mandrel operably coupled to a downstream end of said planetary gearbox;
• and
• a hole saw assembly operably coupled to said mandrel and rotatably coupled to said flow reducer, said hole saw assembly comprises:
• a dog crown assembly rotatably coupled to said flow reducer via a stator assembly;
• a hole saw disposed within said dog crown and in sliding relationship with said dog crown, said hole saw being coupled to a downstream end of said drivetrain assembly;
• and
• a plurality of hooks, each having a base end rotatably coupled to said dog crown and a mid-portion rotatably coupled to a ring disposed within said hole saw, such that, when said hole saw slides forward or rearward relative to said dog crown, said plurality of hooks rotate between a latched position and an unlatched position, respectively;
• and
• a pilot bit coupled to said mandrel and disposed along said central longitudinal axis;
• wherein said inner housing is in a sliding relationship with said plurality of linear bearing shafts and adapted to move forward and rearward with respect to said orifice plate and said flow reducer;
• and
• wherein a downstream end of said drivetrain assembly is in fluid communication with said annular flow region.