The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 30, 1979
Filed:
Mar. 24, 1978
Anthony Ciavattoni, Staten Island, NY (US);
John J Flynn, Hazlet, NJ (US);
Robert H Cushman, Princeton, NJ (US);
Pennwalt Corporation, Philadelphia, PA (US);
Abstract
Panoramic dental X-ray machine having an improved X-ray film drive mechanism for coordinating the speed of travel of the X-ray film with non-constant speeds of lateral chair shift to provide continuous radiographs of typical dental arch areas. The film drive mechanism employs a non-rotating cam slidably mounted about a motor shaft which rotates an assembly comprising a tubehead and a cassette holder assembly. The non-rotating cam is provided with adjacent opposing slope areas for programming decreased film travel speed when the incisors of the dental arch are being X-rayed. The film is traveling at its slowest rate of speed when the midline of the incisors is being X-rayed while the chair is traveling at its fastest rate of speed thereat. The chair shifts during the X-raying of the anterior region only. A cam follower is mounted to a plate which is pivotally mounted to the tubehead-cassette holder assembly for rotation with assembly. The plate also mounts cable and roller means which cooperate to urge the follower to constantly contact working surfaces and the adjacent opposing slope areas of the non-rotating cam. The chair shift speed is controlled by a rotating barrel cam having a continuous groove disposed therein, which rotating groove is contacted by a follower guide secured to a platform which mounts the chair.