Nozzle

Claim 2

A nozzle for an airless coating apparatus for hydraulically atomizing and spraying coating material, the nozzle comprising a unitary, one-piece body, a passageway in the body, a converging wall portion at one end of the passageway, the other end of the passageway adapted to be connected to a source of coating material, an opening in the body, the opening communicating with the converging wall portion of the passageway to provide a coating material discharge orifice, and, a step in the passageway at about the junction between the converging wall portion of the passageway and a main portion of the passageway, the step and the passageway and the opening cooperating to provide a spray pattern of deposited coating material having feathered opposite extremities.

Claim 3

A nozzle for an airless coating apparatus as claimed in claim 1, wherein the opening is a substantially V-shaped groove.

Claim 4

A nozzle for an airless coating apparatus as claimed in claim 1, wherein the step in the passageway is at the junction between the converging wall portion of the passageway and the main portion of the passageway.

Claim 5

A nozzle for an airless coating apparatus as claimed in claim 3, wherein the opening is a groove having a base extending to a location adjacent the junction between the converging wall portion of the passageway and the main portion of the passageway.

Claim 6

A nozzle for an airless coating apparatus as claimed in claim 3, wherein the converging wall portion of the passageway is a concavity.

Claim 7

A nozzle for an airless coating apparatus comprising a body, a passageway in the body, a converging wall portion at one end of the passageway, another end of the passageway adapted to be conNected to a source of coating material, a substantially V-shaped groove in the body, the groove communicating with the converging wall portion of the passageway and adapted to provide a coating material discharge orifice, and a step displaced from the other end of the passageway and in the passageway at about the junction between the converging wall portion of the passageway and the main portion of the passageway, the base of the ''''V'''' of the V-shaped groove being at about the junction between the converging wall portion and the main portion of the passageway, the step and the passageway and the groove cooperating to provide a spray pattern of deposited coating material having feathered opposite extremities.

Claim 8

A nozzle for an airless coating apparatus comprising a body, a passageway in the body, a converging wall portion at one end of the passageway, another end of the passageway adapted to be conNected to a source of coating material, a substantially V-shaped groove in the body, the groove communicating with the converging wall portion of the passageway and adapted to provide a coating material discharge orifice, and a step displaced from the other end of the passageway and in the passageway at about the junction between the converging wall portion of the passageway and the main portion of the passageway, the base of the ''''V'''' of the V-shaped groove being at about the junction between the converging wall portion and the main portion of the passageway, the step and the passageway and the groove cooperating to provide a spray pattern of deposited coating material having feathered opposite extremities.

Claim 9

A nozzle for an airless coating apparatus as claimed in claim 6 wherein the converging wall portion of the passageway is a concavity.

Claim 10

A nozzle for an airless coating apparatus as claimed in claim 6, wherein the step in the passageway is an annular step.

Claim 11

A nozzle for an airless coating apparatus as claimed in claim 8, wherein the step is at about a right angle with the main portion of the passageway.

Claim 12

In combination an electrostatic airless spray gun and a nozzle for the electrostatic spray gun comprising a body, a passageway in the body, a converging wall portion provided at one end of the passageway, another end of the passageway adapted to be connected to a source of coating material a substantially V-shaped groove in the body, the groove communicating with the converging wall portion of the passageway adapted to provide a coating material discharge orifice, and an annular step displaced from the other end of the passageway and in the passageway at about the junction between the converging wall portion of the passageway and the main portion of the passageway, the base of the ''''V'''' of the V-shaped groove being adjacent the junction between the converging wall portion and the main portion of the passageway, the step and the passageway and the groove cooperating to provide a spray pattern of deposited coating material having feathered opposite extremities.

Claim 13

In combination an electrostatic airless spray gun and a nozzle for the electrostatic spray gun comprising a body, a passageway in the body, a converging wall portion provided at one end of the passageway, another end of the passageway adapted to be connected to a source of coating material a substantially V-shaped groove in the body, the groove communicating with the converging wall portion of the passageway adapted to provide a coating material discharge orifice, and an annular step displaced from the other end of the passageway and in the passageway at about the junction between the converging wall portion of the passageway and the main portion of the passageway, the base of the ''''V'''' of the V-shaped groove being adjacent the junction between the converging wall portion and the main portion of the passageway, the step and the passageway and the groove cooperating to provide a spray pattern of deposited coating material having feathered opposite extremities.

Claim 14

In combination, an electrostatic airless spray gun and a nozzle for the gun as claimed in claim 10, wherein the converging wall portion of the passageway is a concavity.

Claim 15

A nozzle for airless coating apparatus characterized in that the nozzle body has formed therein a dome-shaped cavity which is opened to the outside at its rear end, said nozzle body also having formed at its front a V-shaped groove arranged to cross the foremost end portion of said cavity, said dome-shaped cavity being defined by a saucer-shaped or deep cut-shaped concavity and a cylinder having a diameter equal to or slightly larger than the diameter of said concavity, and an annular corner section is formed at the boundary between said concavity and cylinder, said V-shaped groove being formed such that its root is adjacent said boundary, the corner section and the cavity and the groove cooperating to provide a spray pattern of deposited coating material having feathered opposite extremities.

Claim 16

A nozzle for airless coating apparatus characterized in that the nozzle body has formed therein a dome-shaped cavity which is opened to the outside at its rear end, said nozzle body also having formed at its front a V-shaped groove arranged to cross the foremost end portion of said cavity, said dome-shaped cavity being defined by a saucer-shaped or deep cut-shaped concavity and a cylinder having a diameter equal to or slightly larger than the diameter of said concavity, and an annular corner section is formed at the boundary between said concavity and cylinder, said V-shaped groove being formed such that its root is adjacent said boundary, the corner section and the cavity and the groove cooperating to provide a spray pattern of deposited coating material having feathered opposite extremities.

Claim 17

A nozzle comprising a unitary, one-piece body, a passageway in the body, a concavity at one end of the passageway, a substantially V-shaped groove in the body, the groove communicating with the concavity providing a discharge orifice for material, and a step in the passageway at the junction between the concavity of the passageway and a main portion of the passageway, the step being annular and at about a right angle with the main portion of the passageway, the base of the ''''V'''' of the V-shaped groove projecting to or beyond the junction between the concavity and the main portion of the passageway, the step and the passageway and the groove cooperating to provide a spray pattern of deposited material having feathered opposite extremities.

Claim 18

A nozzle comprising a unitary, one-piece body, a passageway in the body, a concavity at one end of the passageway, a substantially V-shaped groove in the body, the groove communicating with the concavity providing a discharge orifice for material, and a step in the passageway at the junction between the concavity of the passageway and a main portion of the passageway, the step being annular and at about a right angle with the main portion of the passageway, the base of the ''''V'''' of the V-shaped groove projecting to or beyond the junction between the concavity and the main portion of the passageway, the step and the passageway and the groove cooperating to provide a spray pattern of deposited material having feathered opposite extremities.

Claim 19

The nozzle of claim 13 wherein the main portion of the passageway is cylindrical in shape and has a diameter Slightly larger than the largest dimension of the concavity.

Claim 20

A nozzle providing a spray pattern of deposited material having feathered opposite extremities, the nozzle comprising a unitary, one-piece body, a passageway including a rear end in the body, a concavity at an end of the passageway opposite the rear end, an opening in the body, the opening communicating with the concavity providing a discharge orifice for material, and a substantially annular step in the passageway at about the junction between the concavity of the passageway and a main portion of the passageway and displaced from the rear end of the passageway, the step and the passageway and the opening cooperating to provide the spray pattern of deposited material having feathered opposite extremities.

Claim 21

A nozzle providing a spray pattern of deposited material having feathered opposite extremities, the nozzle comprising a unitary, one-piece body, a passageway including a rear end in the body, a concavity at an end of the passageway opposite the rear end, an opening in the body, the opening communicating with the concavity providing a discharge orifice for material, and a substantially annular step in the passageway at about the junction between the concavity of the passageway and a main portion of the passageway and displaced from the rear end of the passageway, the step and the passageway and the opening cooperating to provide the spray pattern of deposited material having feathered opposite extremities.