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A telescoping key stem is incorporated into a latching key module to increase the latch down distance and thereby improve visual human factors.
English (United States)
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A telescoping key stem is incorporated into a latching key module to
increase the latch down distance and thereby improve visual human factors.
With present electronic keyboard key modules, depth restrictions have
resulted in almost nondiscernable latch down levels for alternate action keys.
For example, a present module is carried by frame 7 and includes key button 1
which is securely connected to stem 2. Stem 2 is, in turn, securely connected to
Keybutton 1 is urged in an inward direction by spring 8, which is
concentrically maintained about stem 2 by clip 9. With the arrangement shown,
the maximum depression distance of keybutton 1 is the sum of distances 4 and 5
for latching push-to-latch, push-to-unlatch mechanism 6. Upon latching,
keybutton 1 will restore through distance 4 and remain depressed at distance 5
from the normal position shown. Distance 4 provides the necessary play for
operating mechanism 6.
By structuring stem 2 to telescope in plunger 3, distance 5 can be increased
to distance 10. In order to control telescoping and obtain the desired result, a
radial pin 11 is connected to stem 2, and a slot 12 is provided in plunger 3. Upon
depression of button 1, pin 11 must bottom in slot 12 before there will be any
movement of plunger 3. When pin 11 bottoms in slot 12, further depression of
keybutton 1 will operate mechanism 6 in a push-to-latch mode. Upon release of
keybutton 1, it will restore through distance 13. The differences...