Explosion-protected computer terminal

Details Explosion-protected computer terminal Explosion-protected computer terminal

1985-10-18

1989-07-11

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340720, 358100, 358245, G09G 100

Patent

active

048476021

ABSTRACT:
A computer terminal including a cathode ray tube display in an explosion-protected electrically grounded enclosure. The front wall of the enclosure is formed by a hermetically sealed keypanel having an electrically conductive window located opposite the display for discharging, without sparking, static electricity to the grounded enclosure. The keypanel is formed from a rigid metal plate containing a pattern of several apertures in which the mounted pressure-sensitive piezoelectric switches which serve as data key input devices. A deformable metal sheet covers the rigid metal plate and apertures and has defined therein pressure points opposite corresponding apertures. The rigidity of the metal plate is sufficient to prevent pressure applied to one pressure point from affecting a switch at any other pressure point.

REFERENCES:
patent: 3383487 (1968-05-01), Wiener
patent: 3499113 (1970-03-01), Rymes
patent: 3925776 (1975-12-01), Swallow
patent: 4066853 (1978-01-01), Zenk
patent: 4072929 (1978-02-01), Garmong
patent: 4228330 (1980-10-01), Larson
patent: 4296406 (1981-10-01), Pearson
patent: 4339634 (1982-07-01), Weber
patent: 4468702 (1984-08-01), Jandrell
patent: 4529905 (1985-07-01), Ohkoshi et al.
patent: 4539655 (1985-09-01), Trussel et al.
patent: 4618797 (1986-10-01), Cline

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