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In electronic keyboard systems, a requirement often exists for locking one or more keys on the keyboard to make them inoperable. This is often necessary under system control rather than operator control.
English (United States)
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Keyboard Lock Mechanism
In electronic keyboard systems, a requirement often exists
for locking one or more keys on the keyboard to make them inoperable.
This is often necessary under system control rather than operator
The figure illustrates a keyboard locking mechanism which can be adapted to
lock one or more key buttons in the undepressed state under control of either the
operator or the system operating a solenoid (not shown). Key modules 1 are
mounted on a keyboard framework 2, as shown. It is desired to lock keybuttons 3
so that they may not be depressed under certain circumstances, for example, to
make a numeric key pad area on an overall general purpose keyboard inactive
during portions of a data entry.
Interposer bars 4, which are inserted through slots 5 in frame 2 and into
matching slots in the key modules 1, facilitate locking the keybuttons in the up or
undepressed position. Interposer bars 4 have interposer blades 15 and notches
14 which cooperate with the key stem (not shown) to lock it in the upward
position when blade portion 15 is underneath a keybutton or to allow depression
when a notch area 14 is under a given key position. The locking bars 4 are
reciprocated in the horizontal direction by means of a reciprocating slide 6 driven
by a push or pull rod 7 connected to a solenoid (not shown). Cam slots 8,
formed in slide bar 6, interact with followers 9 mounted on the undersides of the
locking bars 4. The slide bar 6 is mounted in a slide...