Telephonic communications – Supervisory or control line signaling – Substation originated
Patent
1987-09-03
1989-01-24
Dwyer, James L.
Telephonic communications
Supervisory or control line signaling
Substation originated
40371, H04M 127
Patent
active
048005843
ABSTRACT:
An indexing device for providing signals identifying the address in a memory device of stored information corresponding to any selected listing in the index has a housing in which is stacked a quantity of index cards of the type enabling a plurality of listings to be entered on each card. The housing can be closed by a hinged cover which carries an indicator that can be moved to line up with card identifying indicia marked on the cover. The indicator is pivotally mounted on a carriage that is slidably mounted at one edge of the cover. Disposed in the housing along the path of travel of the slidable indicator is a position sensor which detects the position of the indicator at stations which are disposed along the indicator's travel path to match the alignment of the indicator with the card identifying indicia on the cover. Coupled to the position sensor is a signal generator which, when the cover is unlatched, emits a "card" signal that is part of the address at which the related information is stored in the memory device. Pivoting of the indicator on the carriage causes the position sensor to sense the position of the indicator and substantially simultaneously unlatches the cover.
REFERENCES:
patent: 4277651 (1981-07-01), Fisher, II et al.
patent: 4278845 (1981-07-01), Chiou
patent: 4408101 (1983-10-01), Brodbeck
patent: 4409440 (1983-10-01), Brodbeck
patent: 4595798 (1986-06-01), Brodbeck
patent: 4661976 (1987-04-01), Busch
Dwyer James L.
Tandy Electronics Japan Ltd.
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