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US 4,165,022 AGranted
Hand-held coating-dispensing apparatus
AssigneeRansburg Corporation
InventorsStanley L. Bentley, David G. Jessup
Life of this patent
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AssigneeRansburg Corporation
InventorsStanley L. Bentley, David G. Jessup
Estimating the term…
An electrostatic, coating-dispensing apparatus includes an electrode upon which an electrostatic potential is impressed. The electrostatic potential is developed by a switching circuit, autotransformer and voltage multiplier from rectified line voltage. The entire apparatus is housed in a hand-held applicator to which line voltage is supplied. The apparatus includes a socket defined at one end thereof for interchangeably receiving containers holding various colors or types of coating material. Each container includes an electrode for contacting the first-mentioned electrode. The containers are shaped to fit snugly into the socket to hold the two electrodes in contact. An outer end wall of each container has a mesh portion through which charged particles of coating material from the interior of the container pass when the apparatus is activated.
An electrostatic coating-dispensing apparatus comprising a hand-held housing, means for supplying coating to be dispensed to the housing, a source of low voltage direct current, the low voltage direct current source being housed in the housing, means coupled to the low voltage direct current source for providing control signals, said control signal providing means being responsive to the low voltage direct current, means coupled to the low voltage direct current source and control signal providing means for switching the low voltage direct current in response to such control signals, means coupled to the switching means for boosting the switched low voltage, means coupled to the boosting means for rectifying the boosted voltage, an electrode coupled to the rectifying means for supplying the rectified and boosted voltage to the coating to be dispensed, and means for supplying alternating current line voltage to the housing, the line voltage supply means being coupled to the low voltage direct current source, the means for supplying coating to be dispensed comprising an interchangeable cartridge engageable with the electrode to define a self-contained dispenser for the particles of coating, said cartridge having an end wall adjacent said electrode and said end wall including a semi-conductive material portion to transmit charge from said electrode to the particles of coating.
An electrostatic coating-dispensing apparatus comprising a hand-held housing including means for supplying alternating current line voltage to the housing, means for rectifying the line voltage, a switch for controlling the supply of line voltage to the rectifying means, an active current conducting device for switching the rectified line voltage, the active current conducting device having two electrodes providing a main current conducting path and a control electrode, oscillator means for controlling the active current conducting device, the oscillator means being coupled to the control electrode, first means for boosting the voltage across the main current conducting path, the first boost means being excited by the voltage variations appearing thereacross as the active current conducting device operates, second boost means for rectifying and further boosting the once-boosted voltage variations produced by the first boost means, the second boost means being coupled to the first boost means, an electrode for receiving the rectified twice-boosted voltage, the electrode means being coupled to the second boost means, and an interchangeable cartridge for supplying particles of coating to be dispensed, the cartridge being engageable with the hand-held housing, the cartridge including an end wall adjacent the electrode to couple charge therefrom, the end wall including a layer of semi-conductive material to transmit charge from the electrode to the particles of coating in the cartridge.
A coating dispensing applicator including hand-held means for housing the applicator components, the components comprising a source of low voltage direct current, means for providing control signals in response to the low voltage direct current, the control signal providing means being coupled to the low voltage direct current source, means for switching the low voltage direct current in response to such control signals, the switching means being coupled to the low voltage direct current source, means for boosting the switched low voltage, the boosting means being coupled to the switching means, means for rectifying the boosted voltage, the rectifying means being coupled to the boosting means, an electrode coupled to the rectifying means for supplying the rectified and boosted voltage to the coating to be dispensed, and an interchangeable cartridge for supplying coating to be dispensed, the cartridge being engageable with the hand-held means and with the electrode to define a self-contained coating dispensing applicator, the cartridge having an end wall adjacent the electrode, the end wall including a semi-conductive material portion to transmit charge from the electrode to the particles of coating in the cartridge.
Dependencies are inferred from the claim text.