Keyswitch for notebook computer

Details Keyswitch for notebook computer Keyswitch for notebook computer

1999-11-05

2001-01-30

Hilten, John S. (Department: 2854)

Typewriting machines

Key-board or key lever-actuating mechanism

Key-cap or key-stem structure

C400S490000, C200S344000

Reexamination Certificate

active

06179497

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a keyswitch for notebook computer, especially to a keyswitch for notebook computer wherein the keytops thereof do not weave during operation.
BACKGROUND OF THE INVENTION
As shown in FIG.
1
. the conventional lever type keyswitch
10
a
for notebook computer generally comprises a keytop
11
a
, a rubber cone
12
a
, a first lever
13
a
, a second lever
14
a
, a base
16
a
and a bottom plate
22
a
. The first lever
13
a
and the second lever
14
a
are in scissors arrangement and have respectively pivotal shaft
18
a
and
19
a
on lower end thereof and arranged within a recess
20
a
and
21
a
formed on top of the base
16
a
. Moreover, the upper ends of the first lever
13
a
and the second lever
14
a
are pivotally connected to the bottom of the keytop
11
a
and the rubber cone
12
a
is located to a region corresponding to the key pressing stroke of the keytop
11
a
. The keytop
11
a
, upon key pressing operation, is guide by the first lever
13
a
and the second lever
14
a
to depress the rubber cone
12
a
below the keytop
11
a
. The rubber cone
12
a
is collapsed to touch a circuit membrane
15
a
on the base
16
a
, thus generating keyswitch signal. However in above mentioned conventional lever type keyswitch
10
a
, the keytop
11
a
is liable to shake during the keyswitch operation.
Therefore, it is the object of the present invention to provide a keyswitch, which has stable movement and is not shaken during operation.
To achieve above object, the keyswitch according to the present invention comprises at least a keytop, a rubber cone, a base, a bottom plate below the base and two levers arranged in scissors form between the keytop and the base. The upper ends of the two levers are connected to the keytop and the lower ends of the two levers are provided with pivotal shafts. The pivotal shafts on the both lower ends of at least one lever is projecting from an outer wall of the lever such that a dent is formed between a rear wall of the pivotal shaft and a bottom end of the lever. The base has a plurality of through holes corresponding to the pivotal shafts on the both lower ends of the levers and the pivotal shafts are pivotally engaged with the through holes. A clamping plate arranged atop each the through hole. The base has a hollow accommodating space below the two levers. The bottom plate has a plurality of through holes corresponding to the pivotal shafts on the both lower ends of the levers. The dents are fitted to an inner edge of the through holes on the bottom plate. The keyswitch of the present invention has stable movement and is not shaken during operation.


REFERENCES:
patent: 5850194 (1999-12-01), Liu
patent: 5898145 (1999-04-01), Su
patent: 5964341 (1999-10-01), Tsai
patent: 5997196 (1999-12-01), Hu
patent: 6011227 (2000-01-01), Yoneyama

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