Computer keyswitch

Details Computer keyswitch Computer keyswitch

2001-01-25

2002-01-22

Friedhofer, Michael (Department: 2832)

Electricity: circuit makers and breakers

Electric switch details

Actuators

Reexamination Certificate

active

06340803

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a computer keyswitch, especially to a computer keyswitch suitable for notebook computer, which has lower height but with same level mechanism height and structural strength.
BACKGROUND OF THE INVENTION
FIG. 1
shows a prior art computer keyswitch
10
a
, which comprises a keycap
11
a
, a resilient body
12
a
, a first lever
13
a
, a second lever
14
a
, a base
15
a
and a bottom plate
16
a
. The first lever
13
a
and the second lever
14
a
are in scissors arrangement and have pivotal shafts
17
a
and
18
a
on bottom ends thereof. The pivotal shafts
17
a
and
18
a
are pivotally retained below clamping plates
19
a
and
20
a
formed on topside of the base
15
a
. The top ends of the first lever
13
a
and the second lever
14
a
are connected to the bottom side of the keycap
11
a
. The first lever
13
a
and the second lever
14
a
form the level mechanism of the keyswitch and the resilient body
12
a
is placed within the movement stroke of the level mechanism. When the keycap
11
a
is guided by the level mechanism composed of the first lever
13
a
and the second lever
14
a
to move downward or upward, the resilient body
12
a
below the keycap
11
a
presses on a membrane circuit
21
a
or leaves the membrane circuit
21
a
to perform on and off operation of the membrane circuit
21
a.
However, in above-mentioned computer keyswitch
10
a
, the pi pivotal shafts
17
a
and
18
a
of the first lever
13
a
and the second lever
14
a
should have sufficient thickness to ensure enough structural strength. The base
15
a
should have considerable thickness and the thickness thereof is much larger than that of the bottom plate
16
a
. Therefore, the clamping plates
19
a
and
20
a
formed on topside of the base
15
a
extend to a considerable height. Therefore, the height of the above-mentioned computer keyswitch
10
a
can not be reduced satisfactorily.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a computer keyswitch, which has lower height but with same level mechanism height and structural strength.
To achieve the above object, the computer keyswitch according to the present invention comprises clamping plate extended upward from the bottom plate thereof. The clamping plate is used to retain the upward motion of the pivotal shafts on bottom end of the two levers of the computer keyswitch. The position, orientation and height of the clamping plate has not limit such that the clamping plate has reduced thickness and height. Therefore, the computer keyswitch has lower height but with same level mechanism height and structural strength.
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: 5878872 (1999-03-01), Tsai
patent: 5898145 (1999-04-01), Su
patent: 6040540 (2000-03-01), Tsai et al.
patent: 6040541 (2000-03-01), Li
patent: 6160233 (2000-12-01), Hu
patent: 6183150 (2001-02-01), Kao
patent: 6191776 (2001-02-01), Hu
patent: 6194677 (2001-02-01), Li

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