Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1975-06-25
1977-03-29
Pitts, Harold
Communications: electrical
Audible indication
Percussion-type sound producer
340381, G08B 524
Patent
active
040152553
ABSTRACT:
A sign includes a frame having an upwardly and outwardly extending lip. Laterally spaced digit-forming indicating assemblies each having a hook-shaped upper portion are engaged over the lip of the frame and anchored in place on the frame by screw means or the like at the bottom portions thereof. Each indicating assembly preferably includes a vertical panel made of a material of low magnetic reluctance and supporting on the front face thereof vertically spaced horizontal rows of electromagnets each including a single core leg projecting transversely from the front of the panel and horizontally extending vertically spaced pivot pins offset slightly upwardly from the center lines of the rows of core legs. A number of preferably annular permanent magnets are supported on each pivot pin opposite the core legs and spaced horizontally therealong. An indicating disc is secured to each permanent magnet, and stop members formed by spacer sleeves located between vertical pivot pin supporting strips stop each permanent magnet from being moved into a position where the magnetic axis thereof reaches a position aligned with the magnetic axis of the associated electromagnet core leg.
REFERENCES:
patent: 3140553 (1964-07-01), Taylor
patent: 3469258 (1969-09-01), Winrow
patent: 3518664 (1970-06-01), Taylor
patent: 3540038 (1970-11-01), Taylor
Pitts Harold
Time-O-Matic, Inc.
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