US3817096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ballistic range dust erosion apparatus
Assignee: McDonnell Douglas Corp
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Filing: 1972-04-24
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Granted: 1974-06-18
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Expires: 1992-04-24
Abstract
Abstract Ballistic range dust erosion testing apparatus wherein a saboted test specimen is fired through a calibrated test environment and then captured intact in a deceleration tube for the extraction of dust erosion data. A dust dispenser consists of a vertical hopper with a sliding, reciprocating gate valve having a stationary plate and a sliding plate with coincident holes aligned for metered dust dispersion during reciprocal movement of the sliding plate. Adjustment of moving plate stroke length and frequency (RPM) in combination with phase adjustment with the stationary plate provides a desired dust orientation in space through which the test specimen passes. Controllable vibration in three orthogonal planes applied to the dispenser sweeps the dust grid in space so that the entire area of the target is subjected to a uniform dust impingement, even in a vacuum. Data is obtained by microscopic examination as well as by weighing the eroded specimen.
Inventors
- 👤 I Osofsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:52
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/56; G01N3/567
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
166 words
A particle dispersion apparatus comprising: a hopper for containing a plurality of particles, a dispensing plate forming the base of said hopper and having a plurality of holes therein, a reciprocating metering plate positioned adjacent said dispensing plate and having a matching plurality of holes therein, adjusting means for positioning the holes in said dispensing plate in predetermined initial phase relationship with the holes in said metering plate, and means for cyclically moving said metering plate relative to said dispensing plate to increase and decrease the area of alignment of said holes in said plates, thereby regulating the number of particles passing through the metering holes per cycle independently of the relation of particle size to size of the metering holes, means adapted to pass said article to be impinged by said particles under said plates at a predetermined velocity, and vibration means vibrating said apparatus at a predetermined frequency and amplitude in three orthogonal planes to provide a uniform pattern of impingement on said article.
Claim 2
Dependent Claim
166 words
A particle dispersion apparatus comprising: a hopper for containing a plurality of particles, a dispensing plate forming the base of said hopper and having a plurality of holes therein, a reciprocating metering plate positioned adjacent said dispensing plate and having a matching plurality of holes therein, adjusting means for positioning the holes in said dispensing plate in predetermined initial phase relationship with the holes in said metering plate, and means for cyclically moving said metering plate relative to said dispensing plate to increase and decrease the area of alignment of said holes in said plates, thereby regulating the number of particles passing through the metering holes per cycle independently of the relation of particle size to size of the metering holes, means adapted to pass said article to be impinged by said particles under said plates at a predetermined velocity, and vibration means vibrating said apparatus at a predetermined frequency and amplitude in three orthogonal planes to provide a uniform pattern of impingement on said article.
Claim 3
Dependent Claim
30 words
A particle dispersion apparatus as in claim 1 wherein means are provided for adjusting the cyclical frequency and thereby adjust the vertical spacing of particles passing through said metering plate.
Claim 4
Dependent Claim
35 words
A particle dispersion apparatus as in claim 1 and means for adjusting the distance of movement of said metering plate to regulate the particle quantity passing through holes in said metering plate per stroke thereof.
Claim 5
Dependent Claim
128 words
A particle dispersion apparatus in combination with means for passing an article thereunder for impingement of particles therein upon said article, said particle dispersion apparatus comprising: a hopper for containing a plurality of particles, a dispensing plate forming the base of said hopper and having a plurality of holes therein, a reciprocating metering plate positioned adjacent said dispensing plate and having a matching plurality of holes therein, means for cyclically moving said metering plate relative to said dispensing plate a predetermined distance, and means for adjusting said distance thereby to regulate the particle quantity passing through holes in said metering plate per stroke thereof, said means passing said article under said plates for impingement by said particles being adapted to pass said artiCle thereunder at a predetermined velocity.
Claim 6
Dependent Claim
128 words
A particle dispersion apparatus in combination with means for passing an article thereunder for impingement of particles therein upon said article, said particle dispersion apparatus comprising: a hopper for containing a plurality of particles, a dispensing plate forming the base of said hopper and having a plurality of holes therein, a reciprocating metering plate positioned adjacent said dispensing plate and having a matching plurality of holes therein, means for cyclically moving said metering plate relative to said dispensing plate a predetermined distance, and means for adjusting said distance thereby to regulate the particle quantity passing through holes in said metering plate per stroke thereof, said means passing said article under said plates for impingement by said particles being adapted to pass said artiCle thereunder at a predetermined velocity.
Claim 7
Dependent Claim
27 words
A particle dispersion apparatus as in claim 4 wherein the stroke frequency is adjustable to provide a predetermined vertical spacing of particles passing through said metering plate.
Claim 8
Dependent Claim
34 words
A particle dispersion apparatus as in claim 4 including vibration means vibrating said apparatus at a predetermined frequency and amplitude in three orthogonal planes to provide a uniform pattern of impingement on said article.
Claim 9
Dependent Claim
116 words
A ballistic range particle erosion apparatus comprising: means for firing a test specimen down a ballistic range at a predetermined velocity, said range having an environmental chamber through which said specimen passes, a particle dispersion apparatus in said chamber including a hopper with a dispensing plate forming the base thereof, said dispensing plate having a plurality of holes therein, a reciprocating metering plate positioned adjacent said dispensing plate and having a matching plurality of holes therein, means moving said metering plate relative to said dispensing plate in distance and frequency to provide a predetermined three-dimensional grid pattern of particles through which said specimen passes, and means for nondestructably recovering said specimen for particle erosion examination thereof.
Claim 10
Dependent Claim
116 words
A ballistic range particle erosion apparatus comprising: means for firing a test specimen down a ballistic range at a predetermined velocity, said range having an environmental chamber through which said specimen passes, a particle dispersion apparatus in said chamber including a hopper with a dispensing plate forming the base thereof, said dispensing plate having a plurality of holes therein, a reciprocating metering plate positioned adjacent said dispensing plate and having a matching plurality of holes therein, means moving said metering plate relative to said dispensing plate in distance and frequency to provide a predetermined three-dimensional grid pattern of particles through which said specimen passes, and means for nondestructably recovering said specimen for particle erosion examination thereof.
Claim 11
Dependent Claim
34 words
A ballistic range particle erosion apparatus as in claim 7 wherein said specimen passes through a plurality of deceleration chambers to reduce the speed thereof without destruction of particle impingement effects on said specimen.
References Cited (Backward Citations)
US3606964A
Cited
US3678745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |