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US3684885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotatable x-ray grid with non-stationary center and method
Assignee: Individual
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Filing: 1970-07-27
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Granted: 1972-08-15
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Expires: 1990-07-27
Abstract
Abstract A rotatable grid having a non-stationary center for allowing primary directed x-rays to pass through while preventing scattered secondary radiation from passing through the grid. A disc composed of aluminum or fiber strips interspaced with lead strips has an outer rim rotatably housed in a frame spaced over x-ray film. Compressed air is directed to strike recesses on the rim imparting rotation to the rim with respect to the frame. Four bearing assemblies, each having a roller adjustable from the rim edge and a roller supporting the bottom horizontal rim surface, are attached to the frame. A fastening device on each bearing assembly may be adjusted thereby changing the distance between the rim edge and the rim roller allowing the rotating disc center to move in a direction parallel with respect to the film surface.
Inventors
- 👤 William A Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:31
CPC Classifications
G; G21; G21K; G21K1/00; G21K1/02; G21K1/025
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
159 words
An x-ray grid allowing primary x-ray radiation to pass through to an x-ray film while excluding secondary scattered radiation comprising: a rotatable disc allowing said primary x-ray radiation to pass therethrough; a frame housing said disc; power means to rotate said disc within said frame; bearing assemblies mounted to said frame around said disc with at least one of said assemblies having a bearing spaced away from said disc to allow the center of said disc to move in a direction parallel to said film simultaneously as said disc rotates, each bearing assemblY has a first and second bearing, said first bearing abuts the bottom surface of said disc, said second bearing is adjustable to and from the edge of said disc providing a bearing surface for said edge to contact; and wherein: said disc has recesses around its edge; said power means has an air tube directing compressed air to said recesses to force said disc to rotate.
Claim 2
Dependent Claim
159 words
An x-ray grid allowing primary x-ray radiation to pass through to an x-ray film while excluding secondary scattered radiation comprising: a rotatable disc allowing said primary x-ray radiation to pass therethrough; a frame housing said disc; power means to rotate said disc within said frame; bearing assemblies mounted to said frame around said disc with at least one of said assemblies having a bearing spaced away from said disc to allow the center of said disc to move in a direction parallel to said film simultaneously as said disc rotates, each bearing assemblY has a first and second bearing, said first bearing abuts the bottom surface of said disc, said second bearing is adjustable to and from the edge of said disc providing a bearing surface for said edge to contact; and wherein: said disc has recesses around its edge; said power means has an air tube directing compressed air to said recesses to force said disc to rotate.
Claim 3
Dependent Claim
29 words
The grid of claim 1 wherein: said disc has strips of material opaque to said primary x-ray radiation interspaced with strips of material transparent to said primary x-ray radiation.
Claim 4
Dependent Claim
65 words
The grid of claim 2 wherein: each of said bearing assemblies have a main body fastened to said frame, each of said first bearings are roller bearings rotatably mounted to said main body and extending under said disc, each of said second bearings are roller bearings rotatably mounted to said main body, said second bearings have longitudinal axes parallel with said edge of said disc.
Claim 5
Dependent Claim
50 words
The grid of claim 3 wherein: said bearing assemblies are mounted to said frame 90* relative to each other about said center of said disc, said second bearings of at least two of said bearing assemblies have outside surfaces spaced at least 0.003 inches from said edge of said disc.
Claim 6
Independent Claim
90 words
A method of moving an x-ray grid with respect to x-ray film so as to obtain a clear x-ray image on said film immediately beneath the center of said grid comprising: rotating said grid on bearings within a frame; holding said frame still relative to said film; spacing at least one of said bearings from the edge of said grid so said center moves relative to said film by at least 0.006 inches; and wherein: compressed air is directed to said grid to rotate said grid relative to said film.
Claim 7
Independent Claim
90 words
A method of moving an x-ray grid with respect to x-ray film so as to obtain a clear x-ray image on said film immediately beneath the center of said grid comprising: rotating said grid on bearings within a frame; holding said frame still relative to said film; spacing at least one of said bearings from the edge of said grid so said center moves relative to said film by at least 0.006 inches; and wherein: compressed air is directed to said grid to rotate said grid relative to said film.
Claim 8
Dependent Claim
178 words
An x-ray grid allowing primary x-ray radiation to pass through to an x-ray film while excluding secondary scattered radiation comprising: a rotatable disc allowing said primary x-ray radiation to pass therethrough; a frame housing said disc; power means to rotate said disc within said frame; bearing assemblies mounted to said frame around said disc with at least one of said assemblies having a bearing spaced away from said disc to allow the center of said disc to move in a direction parallel to said film simultaneously as said disc rotates; and wherein: said disc has a rim with a first and second side and a circumferential edge with a continuous ledge projecting therefrom, said first side has recesses formed therein; said power means is a source of pressurized gas directed into said recesses; and, each of said bearing assemblies has a first and second bearing with said second bearing positioned adjacent said edge and ledge, said first bearings are mounted to said frame contacting said second side cooperatively with said second bearings mounting said disc in said frame.
Claim 9
Dependent Claim
178 words
An x-ray grid allowing primary x-ray radiation to pass through to an x-ray film while excluding secondary scattered radiation comprising: a rotatable disc allowing said primary x-ray radiation to pass therethrough; a frame housing said disc; power means to rotate said disc within said frame; bearing assemblies mounted to said frame around said disc with at least one of said assemblies having a bearing spaced away from said disc to allow the center of said disc to move in a direction parallel to said film simultaneously as said disc rotates; and wherein: said disc has a rim with a first and second side and a circumferential edge with a continuous ledge projecting therefrom, said first side has recesses formed therein; said power means is a source of pressurized gas directed into said recesses; and, each of said bearing assemblies has a first and second bearing with said second bearing positioned adjacent said edge and ledge, said first bearings are mounted to said frame contacting said second side cooperatively with said second bearings mounting said disc in said frame.
References Cited (Backward Citations)
FR759534A
Cited
US3489897A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |