Adjustable jet

Claim 2

Adjustable jet comprising means defining a first wall, said first wall being fixed and having a smooth face, an inner thin portion, an outer annular thick portion defining a cavity on a side of said first wall opposed to said smooth face, an orifice which extends axially through said thin portion and has a given minimum transverse extent, said cavity being larger than said orifice so as to be transversely set back from said orifice throughout the periphery of said orifice, said thin portion having a thickness which is a minor fraction of said transverse extent of said orifice whereby said orifice is defined by an edge affording only a small surface for deposit of dust and dirt thereon, means defining a second wall adapted to slide along said smooth face and mask to a varying extent said orifice so as to define a passage of variable section through said first wall, a movable shoe integral with said second wall, magnitude measuring means, elastically yieldable means guiding said shoe and maintaining said second wall in sliding contact with said smooth face and said shoe against said magnitude-measuring means.

Claim 3

Adjustable jet comprising means defining a first wall, said first wall being fixed and having a smooth face, an inner thin portion, an outer annular thick portion defining a cavity on a side of said first wall opposed to said smooth face, an orifice which extends axially through said thin portion and has a given minimum transverse extent, said cavity being larger than said orifice so as to be transversely set back from said orifice throughout the periphery of said orifice, said thin portion having a thickness which is a minor fraction of said transverse extent of said orifice whereby said orifice is defined by an edge affording only a small surface for deposit of dust and dirt thereon, means defiNing a second wall adapted to slide along said smooth face and mask to a varying extent said orifice so as to define a passage of variable section through said first wall, a movable shoe integral with said second wall, magnitude measuring means, elastically yieldable means guiding said shoe and maintaining said second wall in sliding contact with said smooth face and said shoe against said magnitude-measuring means, said first wall comprising a sheet having a thickness of substantially 0.1-0.2 mm. mounted on a support plate defining said cavity.

Claim 4

Adjustable jet comprising means defining a first wall, said first wall being fixed and having a smooth face, an inner thin portion, an outer annular thick portion defining a cavity on a side of said first wall opposed to said smooth face, an orifice which extends axially through said thin portion and has a given minimum transverse extent, said cavity being larger than said orifice so as to be transversely set back from said orifice throughout the periphery of said orifice, said thin portion having a thickness which is a minor fraction of said transverse extent of said orifice whereby said orifice is defined by an edge affording only a small surface for deposit of dust and dirt thereon, means defiNing a second wall adapted to slide along said smooth face and mask to a varying extent said orifice so as to define a passage of variable section through said first wall, a movable shoe integral with said second wall, magnitude measuring means, elastically yieldable means guiding said shoe and maintaining said second wall in sliding contact with said smooth face and said shoe against said magnitude-measuring means, said first wall comprising a sheet having a thickness of substantially 0.1-0.2 mm. mounted on a support plate defining said cavity.

Claim 5

A jet as claimed in claim 2, wherein the movable wall consists of a second sheet attached to a bottom face of said shoe, said second sheet having a thickness of substantially 0.1-0.2 mm. and extending beyond said shoe and constituting a lip portion having a thin leading edge for effecting said masking of said orifice.

Claim 6

A jet as claimed in claim 1, wherein said movable wall is in one piece with said shoe and defines a thin lip which has a thickness of substantially 0.1-0.2 mm. and extends laterally beyond said shoe, said lip and said shoe having lower faces in a common plane.

Claim 7

Adjustable jet comprising a first wall and a second wall defining a variable section passage, said first wall being fixed and having an orifice which is masked to a varying extent by said second wall, a movable shoe integral with said second wall, magnitude-measuring means, elastically yieldable means guiding said shoe and maintaining said shoe against said fixed wall and against said magnitude-measuring means, said elastically yieldable means comprising two parallel elastically yieldable branches having first end portions held stationary and second end portions connected to said shoe, said branches constituting with said shoe a deformable parallelogram.

Claim 8

Adjustable jet comprising a first wall and a second wall defining a variable section passage, said first wall being fixed and having an orifice which is masked to a varying extent by said second wall, a movable shoe integral with said second wall, magnitude-measuring means, elastically yieldable means guiding said shoe and maintaining said shoe against said fixed wall and against said magnitude-measuring means, said elastically yieldable means comprising two parallel elastically yieldable branches having first end portions held stationary and second end portions connected to said shoe, said branches constituting with said shoe a deformable parallelogram.

Claim 9

A jet as claimed in claim 5, wherein said two branches are those of a U-section spring having a loop portion fixed to a fixed support, said second end portions of said parallel branches being bent and engaged in blind apertures in said shoe so as to apply the latter against said fixed wall and bias it in a direction perpendicular to said branches and parallel to said fixed wall.