Planetarium moon projector

Details Planetarium moon projector Planetarium moon projector

1976-03-24

1977-05-03

Grieb, William H.

G09B 2700

Patent

active

040205681

ABSTRACT:
A planetarium moon projector of the direct casting type includes two alternatively interchangeable occulting elements which rotate at twice the period of moon phasing to intercept the projected light beam and effect the waxing and waning of the moon, and which are conically shaped with the same convergent angle as the projected convergent light and with an occulting relief angle. Two intermittent gears revolve integrally with the occulting elements and there is provided a fixed cylindrical rail with a rack, which keeps contact with the intermittent gears, and which interchanges the occulting elements when the intermittent gears are engaged with the rack. An eccentric drive coupling is provided to correct the dislocation of the moon phase caused by the occulting relief angle.

REFERENCES:
patent: 2178352 (1939-10-01), Unglaube et al.
patent: 2632359 (1953-03-01), Spitz
patent: 2827830 (1958-03-01), Vaux et al.
patent: 3312142 (1967-04-01), Shistovsky
patent: 3589035 (1971-06-01), Vickery
patent: 3934358 (1976-01-01), Kitano et al.

Affiliated with

Also associated with

Rating

Planetarium moon projector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Planetarium moon projector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Planetarium moon projector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-337756