US3801346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for applying particulate coating material to a work piece
Assignee: ZACHREY H CO
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Filing: 1971-11-15
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Granted: 1974-04-02
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Expires: 1991-11-15
Abstract
Abstract A system for applying particulate coating material to a work piece, in which the particulate material is directed against the work piece in a series of pulses. Each pulse includes an initial step of feeding a charge of combustible gaseous mixture into a combustion chamber provided with an outlet nozzle. The combustible mixture is ignited and the outflow of gaseous mixture through the nozzle is constricted sufficiently to cause a rapid pressure rise during combustion to a peak value, followed by a period of falling pressure during continued outflow of the combusted mixture through the nozzle. A charge of the particulate coating material is injected into the combustion chamber for a brief period which terminates while the pressure in the chamber is at least a substantial proportion of the peak pressure. The outflow of combustion mixture and entrained particulate material is directed through the nozzle at high velocity against the work piece to cause the particulate material to form a coating on the work piece.
Inventors
- 👤 R Melton
- 👤 W Weatherford
- 👤 C Wood
- 👤 J Clark
- 👤 R Mathis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:36
CPC Classifications
B; B05; B05B; B05B7/00; B05B7/0006; C; C23; C23C; C23C4/00; C23C4/12; C23C4/126
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
49 words
The method of claim 1 wherein the combustible gaseous mixture is introduced to the chamber at a sufficiently high rate to raise the pressure of the mixture substantially above atmospheric pressure and the deflagration of the gaseous mixture is initiated while the gaseous mixture is substantially above atmospheric pressure.
Claim 2
Dependent Claim
13 words
The method of claim 1 wherein the gaseous mixture is fuel and air.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein the particulate material is introduced to the gaseous mixture before a major portion of the gaseous mixture has been directed through the nozzle.
Claim 4
Dependent Claim
28 words
The method of claim 1 wherein a portion of the gaseous mixture is combusted by autoignition after the pressure of the gaseous mixture has been increased by deflagration.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein the particulate material coats the work piece.
Claim 6
Independent Claim
135 words
The method for applying particulate coating material to a work piece comprising feeding a gaseous combustible mixture into a combustion chamber having an open gas outlet the diameter of which is substantially smaller than that of the combustion chamber at a sufficiently high rate to increase the pressure in the chamber substantially above atmospheric pressure and then igniting the mixture to cause an additional rapid pressure rise within the chamber to a peak value as the mixture is burned substantially within the chamber, injecting particulate coating material into the combustion chamber so that the particulate material will be preheated before leaving the combustion chamber, and directing the gases of combustion and heated particulate coating material issuing from the outlet through an elongated nozzle to accelerate the particles and impact the particles against the work piece.
Claim 7
Dependent Claim
14 words
The method of claim 7 wherein the combustible mixture is substantially fuel and air.
Claim 8
Dependent Claim
21 words
The method of claim 7 wherein the pressure in the combusion chamber prior to ignition is at least about three atmospheres.
Claim 9
Independent Claim
122 words
The method for applying the particulate coating material to a work piece using a combustion chamber having a restrictive gas outlet which comprises: introducing a combustible gaseous mixture to the combustion chamber at a sufficiently high rate to increase the pressure of the gaseous mixture in the chamber substantially above atmospheric pressure, combusting the gaseous mixture in the chamber by deflagration to cause an additional rapid rise of the pressure in the chamber, injecting particulate material into the gaseous mixture while a major portion of the gaseous mixture is still in the combustion chamber, and directing the gases and particulate material issuing at high velocities from the gas outlet through an elongated nozzle to accelerate the particulate material against the work piece.
Claim 10
Dependent Claim
36 words
The method of claim 10 wherein the combustible gaseous mixture is confined such as to substantially minimize the maximum deflagration flame propagation period and thus increase the peak pressure obtained as a result of the combustion.
Claim 11
Dependent Claim
16 words
The method of claim 10 wherein the combustible gaseous mixture is a carbonaceous fuel and air.
Claim 12
Dependent Claim
17 words
The method of claim 12 wherein the particulate material is a material having a high melting point.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |