Typewriting machines – Key-board or key lever-actuating mechanism
Patent
1989-10-04
1990-08-14
Burr, Edgar S.
Typewriting machines
Key-board or key lever-actuating mechanism
400676, B41J 510
Patent
active
049482815
ABSTRACT:
The invention provides means to protect a widely used keyboard such as the IBM XT PC and PS/2 keyboard against vandalism and spill if such a keyboard is used in exposed situations, e.g. in self-service application/transaction machines which are publically accessible and unattended. On the base plate or housing 1 respectively of the keyboard 12 a grid plate 8 is fixed. This grid plate has openings 10 arranged in the pattern of the keys and in such a size that the cone-like keys 11 cannot be removed toward the top. The grid plate may be fixed directly to the keyboard housing or by means of a supporting frame 4 which is secured to the housing. In both cases grid plate or supporting frame respectively include a rim 5 to form a shallow trough 21 with the keyboard housing. A gasket 2 is provided between grid plate or supporting frame respectively and the keyboard housing. A drain 3 is provided in the rim to give controlled outflow. Thus spilled liquid cannot intrude over the edges into the interior of the keyboard housing and by the grid plate the removal of keys toward the top is not possible.
REFERENCES:
patent: 4359612 (1982-11-01), Rooney
patent: 4449763 (1984-05-01), Barnett
patent: 4671688 (1987-06-01), Brashears
Burr Edgar S.
International Business Machines - Corporation
Letson Laurence R.
Patel Motilal P.
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