US4198566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motion mechanism of X-ray film in panoramic radiography
Assignee: Soredex Oy
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Filing: 1979-02-05
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Granted: 1980-04-15
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Expires: 1999-02-05
Abstract
Abstract This invention relates to a motion mechanism for moving an X-ray film in a panoramic X-ray machine in a predetermined pattern and rate of travel relative to a source of radiation. The mechanism includes a cassette holder on which is carried a rotatable rod or roller driven by a traction wheel, a lever assembly for changing the drive angle between the traction wheel and the rod and a moving or rotatable supporting column or structure on which the motion mechanism is mounted. The panoramic X-ray machine also has a radiation source suspended from one end of the supporting structure at a position opposite the cassette holder. The object o patient to be radiographed is placed between the radiation source and the cassette holder and the supporting structure is rotated at a selected rotational speed about the object.
Inventors
- 👤 Timo Nieminen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:38
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/42; A61B6/4283; A61B6/50; A61B6/51; G; G03; G03B; G03B42/00; G03B42/02; G03B42/04; G03B42/042
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
233 words
A panoramic X-ray machine comprising: (a) a base member; (b) a supporting structure rotationally mounted intermediate the ends thereof upon said base member; (c) an X-ray source attached to one end of said rotatable supporting structure; (d) an X-ray film cassette holder attached to the opposite end of said rotatable supporting structure, said cassette holder adapted to hold a film cassette for linear movement during radiographic exposure; (e) means for rotationally driving said rotatable supporting structure about said base member; and (f) means for driving the film cassette held by said film cassette holder in a linear direction relative to said rotatable supporting structure, said film cassette driving means comprising: (1) a rod mounted on said film cassette holder with the longitudinal axis thereof parallel to the plane of the film cassette, said rod mounted for rotation about the longitudinal axis thereof; (2) a traction wheel in frictional driving engagement with said rotatable rod; and (3) means for rotatably driving said traction wheel such that the rotational axis of said traction wheel is varied in a predetermined angular relation with the longitudinal axis of said rotatable rod; such that the linear speed of the film cassette relative to said film cassette holder during radiographic exposure is varied in a predetermined manner which is dependent upon the angle between the longitudinal axis of said rotatable rod and the rotational axis of said traction wheel.
Claim 2
Dependent Claim
233 words
A panoramic X-ray machine comprising: (a) a base member; (b) a supporting structure rotationally mounted intermediate the ends thereof upon said base member; (c) an X-ray source attached to one end of said rotatable supporting structure; (d) an X-ray film cassette holder attached to the opposite end of said rotatable supporting structure, said cassette holder adapted to hold a film cassette for linear movement during radiographic exposure; (e) means for rotationally driving said rotatable supporting structure about said base member; and (f) means for driving the film cassette held by said film cassette holder in a linear direction relative to said rotatable supporting structure, said film cassette driving means comprising: (1) a rod mounted on said film cassette holder with the longitudinal axis thereof parallel to the plane of the film cassette, said rod mounted for rotation about the longitudinal axis thereof; (2) a traction wheel in frictional driving engagement with said rotatable rod; and (3) means for rotatably driving said traction wheel such that the rotational axis of said traction wheel is varied in a predetermined angular relation with the longitudinal axis of said rotatable rod; such that the linear speed of the film cassette relative to said film cassette holder during radiographic exposure is varied in a predetermined manner which is dependent upon the angle between the longitudinal axis of said rotatable rod and the rotational axis of said traction wheel.
Claim 3
Dependent Claim
31 words
The machine of claim 1 wherein: (a) said traction wheel is driven in a predetermined synchronous relation with the rotational movement of said X-ray source attached to said rotatable supporting structure.
Claim 4
Dependent Claim
59 words
The machine of claim 1 wherein: (a) said means for rotatably driving said traction wheel varies the angle between the longitudinal axis of said rotatable rod and the rotatable axis of said traction wheel in a manner which is dependent upon the angular position of said X-ray source relative to the axis of rotation of said rotatable supporting structure.
Claim 5
Dependent Claim
111 words
The machine of claim 1 wherein said means for rotatably driving said traction wheel includes means on said rotatable supporting structure for pivotally mounting said traction wheel, said mounting means comprising: (a) a first lever slidably mounted on said rotatable support structure, said first lever having a first end and a second end; (b) cam plate means affixed to said base member; (c) cam follower means mounted upon the first end of said first lever in contact engagement with said cam plate means; and (d) a second lever having a first end pivotally connected to the second end of said first lever, and a second end connected to said traction wheel.
Claim 6
Dependent Claim
25 words
The machine of claim 4 wherein: (a) the axis of said cam plate means is coincident with the rotational axis of said rotatable supporting structure.
Claim 7
Dependent Claim
20 words
The machine of claim 4 including: (a) lost motion means intermediate the first and second ends of said first lever.
References Cited (Backward Citations)
US2798958A
Cited
US3867636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-15 | 1983-10-15 | 1984-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-15 | 1987-10-15 | 1988-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-15 | 1991-10-15 | 1992-04-15 | $7700.00 | Window Closed / Lapsed |