Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1980-02-13
1982-01-19
Groody, James J.
Communications: electrical
Audible indication
Percussion-type sound producer
178 17C, 310328, 310334, 333146, 333162, 333193, G06F 302, H04L 1503, H01P 902
Patent
active
043119913
ABSTRACT:
An acoustic transmission member is disclosed for use in an encoding system utilizing acoustic energy wherein diverging sound waves are induced within the member in response to selected actuation of a striker positioned along the member. The time taken by each sound wave to travel through the member is measured in the system to provide an elapsed time interval unique to all strikers for generating a code indicative of the selected input. The acoustic transmission member is a rod formed into a series of coils or helixes with at least one coil length provided and when assembled disposed between adjacent striker positions. The coil configuration defines an expanded path, as compared to the straight linear distance between adjacent strikers, for the sound waves to travel. As a result, the elapsed times for adjacent striker positions have a greater spread and resultant insensitivity to tolerance accumulation, thus affording a more reliable encoding process in the presence of variable factors affecting encoding signal readings which are encountered on a mass production basis. Mounting structure in the form of a notched or grooved elongated bar is provided for support of the present acoustic transmission member.
REFERENCES:
patent: 2736881 (1956-02-01), Booth
patent: 2810887 (1957-10-01), Ecklund et al.
patent: 3479572 (1969-11-01), Pokorny
IBM Technical Disclosure, Arosenius, vol. 14, No. 10, Mar. 1972, p. 3199.
IBM Technical Disclosure, Lisk, vol. 20, Jun. 1977, p. 259.
IBM Technical Disclosure, Booth et al., vol. 20, No. 10, Mar. 1978, p. 4188.
Groody James J.
Mear, III William E.
SCM Corporation
Weinberger Ernest F.
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