Panoramic dental X-ray machine employing selectable mode film drive mechanism with shiftable cam followers
US4221970A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 1979 |
| Grant date | Sep 9, 1980 |
| Priority date | — |
| Expiry date | Jun 18, 1999 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/51
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Film drive mechanism for use with a panoramic X-ray machine which provides continuous and discontinuous radiographic images of dental arch areas of a shifting patient. The mechanism utilizes a linkage structure which carries a pair of shiftable cam followers which are separably engageable with cam members having working surfaces configured to advance or retard the speed of rotation of the linkage structure in accordance with mode of radiographing selected, i.e., continuous or discontinuous. A film drive shaft rotates in accordance with an output shaft connected to an output member of the cam-controlled rotating linkage structure which film drive shaft controls speed of rotation of a drum which has the X-ray film wrapped therearound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.