Stable keyswitch

Details Stable keyswitch Stable keyswitch

2000-03-28

2001-03-20

Friedhofer, Michael (Department: 2832)

Electricity: circuit makers and breakers

Electric switch details

Actuators

Reexamination Certificate

active

06204462

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a stable keyswitch, especially to a stable keyswitch, which will not shake during operation and has compact height.
BACKGROUND OF THE INVENTION
As shown in
FIG. 1
, a conventional keyswitch comprises a keycap
10
a
and a stage
11
a
. The stage
11
a
has a mounting hole
12
a
on center thereof. The keycap
10
a
has a plunger
13
a
on bottom thereof and movably fit within the mounting hole
12
a
. When the keycap
10
a
is pressed to lower down the plunger
13
a
, the pressing end
15
a
of the rubber cone
14
a
touches the flexible circuit
16
a
on the base plate
17
a
to switch on the flexible circuit
16
a
. When the keycap
10
a
is released, the pressing end
15
a
of the rubber cone
14
a
leaves the flexible circuit
40
due to the elasticity of the rubber cone
30
, thus switching off the flexible circuit
40
. However, the above mentioned keyswitch has relatively large height and keycap is unstable if the height of the keyswitch is reduced without careful design.
It is an object of the present invention to provide a stable keyswitch wherein the keycap has restrict vertical movement within the stage, thus having more stability. The friction between the keycap and the stage is reduced.
To achieve the above objects, in the inventive keyswitch, at least one guiding rib is provided within the stage or on lateral side of the keycap; and at least one groove corresponding to the guiding rib is provided on lateral side of the keycap or within the stage, the guiding rib fit within the groove such that the keycap is movable upward and downward within the mounting hole without shaking. The keycap is in contact with the stage on lateral side thereof, the friction therebetween is reduced.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing, in which:


REFERENCES:
patent: 4556769 (1985-12-01), Inaba
patent: 5406277 (1995-04-01), Lee
patent: 5496982 (1996-03-01), Tsai
patent: 5710397 (1998-01-01), Liao
patent: 5907612 (1999-05-01), Aggus et al.
patent: 5938009 (1999-08-01), Huang
patent: 6056456 (2000-05-01), Kinoshita

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