Variable keystroke pressure apparatus

Details Variable keystroke pressure apparatus Variable keystroke pressure apparatus

1987-07-13

1989-01-03

Scott, J. R.

Registers

Keyboards

With total transfer to keyboard or the like

400473, 400480, 400679, 400719, G06C 702, B41J 500, B41J 2900

Patent

active

047958880

ABSTRACT:
A keybaord which is capable of varying the pressure required for the keystroke is provided and comprises an inflatable arrangement being a variable pressure bladder which fits over the keyboard between the base plate and the keys. The operator may vary the pressure delivered to the system as desired and may also preset a cycle of time intervals with pressure "on" and pressure "off". Alternatively, the pressure supply may be linked to a number of keyboards and a programmed variable pressure cycle will be delivered to all the keyboards.

REFERENCES:
patent: 2800034 (1957-07-01), Seeger
patent: 3268673 (1966-08-01), Bilek
patent: 3521014 (1970-07-01), Bonanno et al.
patent: 3535479 (1970-10-01), Smyers, Jr. et al.
patent: 3599525 (1971-08-01), Klann
patent: 3603983 (1971-09-01), Mitchell
patent: 4054944 (1977-10-01), Lau
patent: 4074089 (1978-02-01), Mitsugi et al.
patent: 4109118 (1978-08-01), Kley
IBM Technical Disclosure Bulletin; Easton, R. C.; "Hydraulically Controlled Keyboard Interlock Mechanism", vol. 14, No. 8, Jan. 1972, p. 2540.

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