Electrical pulse counters – pulse dividers – or shift registers: c – Applications – Counting based on number of times machine or apparatus operates
Patent
1987-10-05
1989-05-23
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Applications
Counting based on number of times machine or apparatus operates
377 6, 377 53, 377112, 377107, 136291, 368205, 250206, H03K 218, H03K 2138, G06M 1100
Patent
active
048336971
ABSTRACT:
A ballpoint pen of conventional size and shape has a movable ball point that is pressed upwardly in the direction of the housing of the pen when a mark is made. Means is provided for normally biasing the ballpoint outwardly of the housing. However, when the ballpoint is pressed against a writing surface, the refill cartridge having the ball at the lower end thereof is moved upwardly to close a normally open switch which connects a solar cell array in circuit with an electronic counter that counts each time the switch is closed. Controlled by the counter is a liquid crystal display that visually indicates the total number of counts. A gravity switch is contained in the housing and is actuated to reset or clear the counter in preparation for counting a succeeding group of marks when the pen is inverted.
REFERENCES:
patent: 3064888 (1962-11-01), Van De Mark
patent: 3254836 (1966-06-01), Corpian
patent: 3617708 (1971-11-01), Bongiovanni
patent: 3630015 (1971-12-01), Lehovec
patent: 4295038 (1981-10-01), Kreinbrink et al.
patent: 4409538 (1983-10-01), Tabata
patent: 4726044 (1988-02-01), Perna et al.
Perna Fred P.
Peterson Stuart R.
Heyman John S.
Perna Fred P.
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