Monitor boom incorporating twin-jet nozzle apparatus

Claim 2

A twin-jet monitor apparatus, which comprises: support means, first and second nozzle means movably mounted on said support means, said first nozzle means being so directed that the reaction force resulting from discharge of fluid therefrom generates a torque in one direction about a predetermined axis, said second nozzle means being so directed that the reaction force resulting from discharge of fluid therefrom generates a second torque about said axis and which is oppositely directed relative to said first-mentioned torque, means to supply fluid to said nozzle means for discharge therethrough, and first and second actuating means connected, respectively, to said nozzle means to move the same relative to said support means, said first and second actuating means being so correlated to each other, and said first and second nozzle means being so correlated to each other, that said first-mentioned and second torques substantially cancel each other regardless of the positions of said first and second nozzle means relative to said support means, whereby there is substantially no torque about said axis resulting from said reaction forces.

Claim 3

The invention as claimed in claim 1, in which said first nozzle means is a single nozzle of predetermined size, in which said second nozzle means is a single nozzle of the same predetermined size, in which said fluid supply means is connected to supply equal volumes of fluid to said first-mentioned and second-mentioned nozzles, and in which means are provided to operate said first and second actuating means in such manner that the angle of said first-mentioned nozzle relative to a predetermined plane containing said predetermined axis is always Equal to the angle of said second-mentioned nozzle relative to said plane, said nozzles being on opposite sides of said plane.

Claim 4

The invention as claimed in claim 2, in which said nozzles lie in the same plane.

Claim 5

The invention as claimed in claim 3, in which said support means and said fluid supply means include a swivel joint through which fluid is fed to both of said nozzles, the axis of said swivel joint lying in said predetermined plane.

Claim 6

The invention as claimed in claim 4, in which means are provided to effect conjoint rotation of said nozzles about said swivel joint axis.

Claim 7

The invention as claimed in claim 5, in which said support means is a large articulated boom having said nozzle means at the free end thereof, in which said boom is connected to a vertical mast, in which said predetermined axis is coincident with the axis of said mast, and in which means are provided to rotate said mast about said predetermined axis.

Claim 8

A twin-jet monitor apparatus, which comprises: a T-shaped conduit, first and second swivel joints mounted at the ends of the arms of said conduit and coaxially of each other, a third swivel joint mounted at the end of the stem of said conduit, the axis of said third swivel joint being perpendicular to and intersecting the common axis of said first and second swivel joints, a first connector conduit extending from said first swivel joint to a first nozzle, a second connector conduit extending from said second swivel joint to a second nozzle, said first and second nozzles having the same shape and flow capacity, the axes of said nozzles lying in a plane which contains said axis of said third swivel joint, said axes of said nozzles perpendicularly intersecting said common axis of said first and second swivel joints, motor means to rotate said T-shaped conduit about said third swivel joint, motor means to rotate said first connector conduit about said first swivel joint, motor means to rotate said second connector conduit about said second swivel joint, means to operate said motor means for said first and second connector conduits in such manner that said axes of said first and second nozzles always lie at equal angles to a second plane perpendicular to said first-mentioned plane and containing said axis of said third swivel joint, said first and second nozzles lying on opposite sides of said second plane and extending generally forwardly from said third swivel joint, and connector conduits to vary in conjugate manner the angles of said nozzles relative to said second plane.

Claim 9

A twin-jet monitor apparatus, which comprises: a T-shaped conduit, first and second swivel joints mounted at the ends of the arms of said conduit and coaxially of each other, a third swivel joint mounted at the end of the stem of said conduit, the axis of said third swivel joint being perpendicular to and intersecting the common axis of said first and second swivel joints, a first connector conduit extending from said first swivel joint to a first nozzle, a second connector conduit extending from said second swivel joint to a second nozzle, said first and second nozzles having the same shape and flow capacity, the axes of said nozzles lying in a plane which contains said axis of said third swivel joint, said axes of said nozzles perpendicularly intersecting said common axis of said first and second swivel joints, motor means to rotate said T-shaped conduit about said third swivel joint, motor means to rotate said first connector conduit about said first swivel joint, motor means to rotate said second connector conduit about said second swivel joint, means to operate said motor means for said first and second connector conduits in such manner that said axes of said first and second nozzles always lie at equal angles to a second plane perpendicular to said first-mentioned plane and containing said axis of said third swivel joint, said first and second nozzles lying on opposite sides of said second plane and extending generally forwardly from said third swivel joint, and connector conduits to vary in conjugate manner the angles of said nozzles relative to said second plane.

Claim 10

The invention as claimed in claim 7, in which each of said first and second connector conduits has a portion which extends away from said axis of said third swivel joint and along said common axis of said first and second swivel joints.

Claim 11

The invention as claimed in claim 7, in which water supply means are provided to feed water at high flow rates to said third swivel joint and thus to said first and second swivel joints, said supply means and said conduits being such that the flow volume of water through said first swivel joint is equal to the flow volume of water through said second swivel joint.

Claim 12

The invention as claimed in claim 7, in which said third swivel joint is connected at the end of a long boom conduit which, in turn, is connected to a mast conduit.

Claim 13

The invention as claimed in claim 10, in which said boom conduit is pivotally connected to said mast conduit, in which said axis of said third swivel joint intersects the axis of said mast conduit, and in which means are provided to rotate said mast conduit about its axis.