John M Hendricks

US Patent:

50884433, Feb 18, 1992

Filed:

Oct 4, 1989

Appl. No.:

7/416855

Inventors:

Donald R. Hastings - Elyria OH
John A. Hendricks - Vickery OH

Assignee:

Nordson Corporation - West Lake OH

International Classification:

B05B 100

US Classification:

118314

Abstract:

A method and apparatus for spraying liquid coating material containing supercritical fluid or liquified gas as a diluent comprises a spray gun having internal passages which transmit the liquid coating material under high pressure from an inlet to a nozzle at the tip of the gun and then to an outlet so that the liquid coating material can be continuously recirculated. A relatively short flow discharge path is formed between the internal passages in the spray gun and the nozzle to avoid the formation of an area of ambient or reduced pressure so that the supercritical fluid or liquified gas is substantially maintained in solution in the liquid coating until it is discharged from the gun. A pressure regulator is provided to maintain a substantially constant pressure drop across the inlet and outlet of the gun to induce flow of liquid coating material through the gun, and to permit several guns to be connected in series without creating a substantial pressure drop therebetween.

US Patent:

55660428, Oct 15, 1996

Filed:

Jun 2, 1995

Appl. No.:

8/459762

Inventors:

Jeffrey A. Perkins - Loraine OH
Gerald W. Crum - Elyria OH
John A. Hendricks - Vickery OH
Jeffery E. Dailidas - Barrington IL

Assignee:

Nordson Corporation - Westlake OH

International Classification:

B05D 106

US Classification:

361228

Abstract:

An improved power supply for an electrostatic spray gun device having a voltage multiplier circuit adjusts to variations in the output load conditions of the multiplier circuit and dynamically modifies the operational loadline of the multiplier circuit in order to maintain optimal operating conditions for the spray gun device notwithstanding output load variations. The power supply utilizes a loadline manipulation circuit coupled to a feedback circuit that monitors the output load, and the manipulation circuit, in response to a feedback signal from the feedback circuit that is proportional to the output load, varies the input voltage level to the multiplier circuit to modify the loadline of the power supply in response to varying load conditions. The manipulator means of the power supply has memory means to store a variety of external commands which will control the manipulation means and a user interface to enter the external commands into the memory. The power supply also comprises a voltage limiting circuit coupled to the output of the multiplier circuit which regulates the output voltage level of the multiplier circuit so that when the output load current increases above a predetermined maximum level the output voltage is reduced to reduce the high voltage stress on the multiplier circuit and high voltage circuitry and reduce the amount of insulation that must surround the multiplier circuit and high voltage circuitry of the power supply in order to insulate it from ground potential.

US Patent:

51066599, Apr 21, 1992

Filed:

Jan 30, 1991

Appl. No.:

7/647763

Inventors:

Donald R. Hastings - Elyria OH
John A. Hendricks - Vickery OH

Assignee:

Nordson Corporation - Westlake OH

International Classification:

B05D 102

US Classification:

427421

Abstract:

A method and apparatus for spraying liquid coating material containing supercritical fluid or liquified gas as a diluent comprises a spray gun having internal passages which transmit the liquid coating material under high pressure from an inlet to a nozzle at the tip of the gun and then to an outlet so that the liquid coating material can be continuously recirculated. A relatively short flow discharge path is formed between the internal passages in the spray gun and the nozzle to avoid the formation of an area of ambient or reduced pressure so that the supercritical fluid or liquified gas is substantially maintained in solution in the liquid coating until it is discharged from the gun. A pressure regulator is provided to maintain a substantially constant pressure drop across the inlet and outlet of the gun to induce flow of liquid coating material through the gun, and to permit several guns to be connected in series without creating a substantial pressure drop therebetween.