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A keyboard actuator includes a spring mounted keybutton and a magnet mounted switching member arranged to provide an easily assembled keyboard arrangement.
English (United States)
This text was extracted from a PDF file.
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This is the abbreviated version, containing approximately
82% of the total text.
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Spring and Magnet Keyboard Actuator
A keyboard actuator includes a spring mounted keybutton and a magnet
mounted switching member arranged to provide an easily assembled keyboard
A cross section of a portion of a keyboard is depicted in Fig. 1. Keybutton 11
is mounted to the end of flat spring steel keylever 12 which is mounted onto
retaining member 13. Member 13 is a molded part having channels 14 which
hold magnets 15. The magnets extend across the entire keyboard, there being
four such magnets, one for each keyboard row. as depicted in Fig. 2.
Corresponding to each keybutton 11 is a T shaped switching plate 17 which is
held in place by a magnet 15. Depression of keybutton 11 (to the phantom line
position) causes it to push on plate 17, causing end 19 to leave magnet 15 while
forcing end 21 to contact circuit board 23 having a switching member 25
mounted thereon. The contact of ends 21 with switching member 25 may be
capacitively or resistively sensed. When keybutton 11 is released, it is returned
by keylever 12 to its initial position. Additionally, magnet 15 pulls end 19 of plate
17 to its rest position against magnet 15.
Fig. 3 shows the keylevers 12 for the various rows of keybuttons and how
they are formed from a single sheet 31. Members 33, 34, 35 and 36 are
respectively located in different keyboard rows. Members 37 and 38 receive the
spacebar of a typical keyboard. It is noted that all four rows of keybuttoms have
this same length keylever...