US3737660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for taking tomograms of parabolically curved objects
Assignee: Mida Electronic Apparatus Industrial Co Ltd
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Filing: 1970-10-07
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Granted: 1973-06-05
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Expires: 1990-10-07
Abstract
Abstract For taking tomograms of parabolically curved objects such as the dentition, jawbones and other bony structures of the head and dento-facial region, there are provided an X-ray tube and a radiographic film holder at both ends of a turnable arm. This arm is furnished with a plurality of shafts alternately serving as a pivot therefore, in such a manner that the X-ray tube supported at one end of the arm turns round a parabolically curved object at an unvarying distance therefrom, while radiating X-rays which traverse the object to impinge upon the radiographic film carried by the aforesaid holder turning in coordination with the turn of the arm. There are also disclosed herein a device for holding the head of a patient, a device for minute adjustment of ear-rods and the like for use in positioning the head, and a device for modification of the image density of X-rays traversing the head in readily penetrable directions.
Inventors
- 👤 S Ando
- 👤 S Yoshioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:58
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/50; A61B6/51; A61B90/00; A61B90/10; A61B90/14; A61B17/00; A61B2017/00831; A61B2017/00902
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
255 words
In apparatus equipped with a radiant rays source and a radiographic film holder thereby to take a tomogram of an object in the shape of an approximately parabolic curve consisting of not less than two arcs of different curvatures; a head holding device comprising, in combination: a column slidably supporting the head holding device proper; a movable member mounted on a pair of rails within a casing so as to be capable of moving toward and away from said column, said movable member having a means thereby to be secured at any desired position in the course of its travels; a pair of racks disposed in side-by-side relationship across said movable member and having their toothed surfaces opposed to each other; a pinion provided between said racks so as to be in mesh with both of them, said pinion having a means thereby to be turned manually from outside of said casing; a pair of rods provided downwardly at the opposite ends of said racks, each of said rods having at the lower end a flanged earrods to be inserted into the outer orifice of the ear; a chin rest provided to a holding member so as to be vertically movable, said holding member being installed in a supporting portion of said casing so as to be movable toward and away from said column and to be fixed at any desired position in the course of its travels; and a head support including means for adjustment of its position in both vertical and horizontal directions.
Claim 2
Dependent Claim
255 words
In apparatus equipped with a radiant rays source and a radiographic film holder thereby to take a tomogram of an object in the shape of an approximately parabolic curve consisting of not less than two arcs of different curvatures; a head holding device comprising, in combination: a column slidably supporting the head holding device proper; a movable member mounted on a pair of rails within a casing so as to be capable of moving toward and away from said column, said movable member having a means thereby to be secured at any desired position in the course of its travels; a pair of racks disposed in side-by-side relationship across said movable member and having their toothed surfaces opposed to each other; a pinion provided between said racks so as to be in mesh with both of them, said pinion having a means thereby to be turned manually from outside of said casing; a pair of rods provided downwardly at the opposite ends of said racks, each of said rods having at the lower end a flanged earrods to be inserted into the outer orifice of the ear; a chin rest provided to a holding member so as to be vertically movable, said holding member being installed in a supporting portion of said casing so as to be movable toward and away from said column and to be fixed at any desired position in the course of its travels; and a head support including means for adjustment of its position in both vertical and horizontal directions.
Claim 3
Dependent Claim
65 words
A head holding device as claimed in claim 1, in which said holding member is provided with an indicator means, the calibrations for which are given on said supporting portion, and said holding member is provided with another set of calibrations for said chin rest connected slidably thereto, whereby a setting of said chin rest in both horizontal and vertical directions can be read numerically.
Claim 4
Dependent Claim
16 words
A head holding device as claimed in claim 1, in which said flanged ear-rods are transparent.
Claim 5
Dependent Claim
24 words
A head holding device as claimed in claim 3, in which illuminating means are provided in the hollowed interiors of said transparent flanged ear-rods.
Claim 6
Dependent Claim
33 words
A head holding device as claimed in claim 1, in which said movable member is provided with an indicator means capable of indicating its position in directions toward and away from said column.
Claim 7
Dependent Claim
27 words
A head holding device as cLaimed in claim 1, in which said vertical rods are calibrated for indication of the heights of said ear-rods provided slidably thereto.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |