Keyswitch of keyboard

Details Keyswitch of keyboard Keyswitch of keyboard

2001-03-05

2002-05-21

Friedhofer, Michael (Department: 2832)

Electricity: circuit makers and breakers

Electric switch details

Actuators

Reexamination Certificate

active

06392176

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a keyswitch, especially to a keyswitch assembled from top direction to simply process and prevent lateral shake.
BACKGROUND OF THE INVENTION
FIG. 1
shows a conventional computer keyswitch, which is a lever type keyswitch and comprises a keytop
10
a,
a resilient dome
11
a,
a first lever
12
a,
a second lever
13
a
and a base
14
a.
The first lever
12
a
and the second lever
13
a
are in scissors arrangement. The first lever
12
a
has a pivotal shaft
15
a
on bottom thereof and the second lever
13
a
has a pivotal shaft
16
a
on bottom thereof, the pivotal shafts
15
a
and
16
a
are pivotally arranged into pivotal stages
17
a
and
18
a
on top of the base
14
a.
The top end of the first lever
12
a
and the second lever
13
a
are pivotally arranged into bottom of the keytop
10
a,
whereby the first lever
12
a
and the second lever
13
a
forms a link mechanism. The resilient dome
11
a
is placed within the moving stroke of the keytop
10
a.
When the keytop
10
a
is pressed downward or lifted upward; and guided by the first lever
12
a
and the second lever
13
a,
the resilient dome
11
a
below the keytop
10
a
can switch on and off the membrane circuit
19
a.
However, in above-mentioned keyswitch with a first lever
12
a
and a second lever
13
a
in scissors arrangement, the first lever
12
a
and the second lever
13
a
should be assembled along a specific inclined angle. The assembling thereof is cumbersome, and hard to automatic.
Moreover, in above-mentioned keyswitch, the pivotal shafts
15
a
and
16
a
of the first lever
12
a
and the second lever
13
a
are pivotally arranged into pivotal stages
17
a
and
18
a
on top of the base
14
a.
The first lever
12
a
and the second lever
13
a
cannot be firmly retained by the base
14
a.
The keytop
10
a
is shaken during key pressing operation.
Moreover, in above-mentioned keyswitch, the pivotal stages
17
a
and
18
a
of the base
14
a
have the problem of material congestion when being bent. The pivotal shafts
15
a
and
16
a
of the first lever
12
a
and the second lever
13
a
cannot be tightly fit into the pivotal stages
17
a
and
18
a
on top of the base
14
a.
The first lever
12
a
and the second lever
13
a
cannot be firmly retained by the base
14
a.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a keyswitch wherein the first lever thereof can be vertically assembled to the second lever thereof. The assembling of the lever mechanism in the present invention does need specific inclined angle and cumbersome process.
It is another object of the present invention to provide a keyswitch when the two lower pivotal shafts of the second lever thereof are pivotally arranged in the second pivotal stages, the two clamping parts below the second lever clamp the second pivotal stages, respectively. Therefore, the first lever and the second lever are firmly retained on the base and stably guide the keytop such that the keytop will not be shaken during operation.
It is another object of the present invention to provide a keyswitch wherein the first pivotal stage thereof has two broken edges on two lateral bending sides thereof, the first pivotal stage will not have the problem of material congestion during manufacture. The lower pivotal shaft on bottom of the first lever is precisely arranged in the first pivotal stage. Therefore, the first lever and the second lever are firmly retained on the base and stably guide the keytop.
To achieve above object, the present invention provides a keyswitch comprising a keytop, a resilient dome, a first lever, a second lever and a base with pivotal stages. The first lever has two convex parts on centers of two lateral sides thereof and the second lever has two concave parts on centers of two lateral sides thereof and corresponding to the two convex parts. The convex part has an opened groove and the concave part has a pivotal rod corresponding to the opened groove and pivotally arranged into the opened groove. Therefore, the first lever can be vertically assembled to the second lever. The second lever has two clamping parts on two lateral sides thereof and clamping the pivotal stages of the base. Therefore, the first lever and the second lever are firmly retained on the base and stably guide the keytop such that the keytop will not be shaken during operation.
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: 5829579 (1998-11-01), Tsai
patent: 6031189 (2000-02-01), Watanabe et al.
patent: 6156985 (2000-12-01), Chiang
patent: 6160233 (2000-12-01), Hu
patent: 6179497 (2001-01-01), Hu

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