Control system of and device for memorizing, reading and reprodu

Details Control system of and device for memorizing, reading and reprodu Control system of and device for memorizing, reading and reprodu

1980-07-25

1983-03-08

Lyddane, William E.

Chairs and seats

Movable bottom

Tiltable

248421, 297354, 297361, 364174, 367118, A47C 320

Patent

active

043759009

ABSTRACT:
This disclosure relates to a control device of transmitting an ultrasonic pulse from an ultrasonic transmitter to an ultrasonic receiver by disposing the transmitter and the receiver between two movable members which are placed in a variable relation in linear distance with each other, converting aerial propagation time of the pulse from the transmitter to the receiver into an electrical means, memorizing and holding a distance between the two members by the electrical means, and reading the memorized distance at any desired time and reproducing the distance. The disclosure also relates to a control device using the system.

REFERENCES:
patent: 3866973 (1975-02-01), Heubeck
patent: 4264849 (1981-04-01), Fleischer et al.
patent: 4278290 (1981-07-01), Werner et al.
patent: 4280205 (1981-07-01), Dammeyer

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