Electricity: circuit makers and breakers – Solid contact – Push button operated
Reexamination Certificate
2000-09-02
2001-12-04
Friedhofer, Michael (Department: 2832)
Electricity: circuit makers and breakers
Solid contact
Push button operated
C200S533000, C200S534000, C200S535000, C200S341000
Reexamination Certificate
active
06326572
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to a switch assembly, more particularly, it relates to a push-button switch assembly in simple structure for control of power supply by depressing a push button to oppress or release a resilient contact piece directly so as to simplify assembling process and reduce production cost.
2. Description of the Prior Art
A power switch is a widely used electronic component for ON/OFF control of a power supply, and is highlighted in its structural complexity in consideration of cost, and particularly, of its reliability of security.
So far, a variety of patents regarding switch assembly, including U.S. Pat. No. 4,167,720, 4,937,548, 5,223,813, 5,451,729, 5,558,211, etc, has already been disclosed, however, a common defect may be assigned to too many components and too complicated interaction of the switch assembly.
As illustrated in
FIG. 1
, when a prior push button
502
of a push-button switch rests at a top position, a contact point
506
of a conductive piece
504
is separated from a contact point
510
of a contact pin
508
; and when the push button
502
is depressed to a lower position, a spring
514
and a protruding rod
512
disposed in the push-button switch will push the conductive piece
504
forward to enable the contact point
506
to contact with the contact point
510
of the contact pin
508
to have the switch turned “ON”.
However, mechanical contact of the spring
514
and the protruding rod
512
will inevitably result in elastic fatigue and poor contact in the long run, besides, the top face of the push button
502
is somewhat insufficient for design of any reminding symbol or pattern as for promoting appended value.
SUMMARY OF THE INVENTION
The primary object of this invention is to provide a push-button switch assembly in simple structure for control of power supply by depressing a push button to oppress or release a resilient contact piece directly so as to simplify assembling process and reduce production cost.
Another object of this invention is to provide a push-button switch assembly, wherein a push-button cover is changeable in molding and in color to match background, to enrich color feeling, and to promote appended value.
Yet another object of this invention is to provide a push-button switch assembly with prolonged lifetime to reduce resource waste and product cost.
In order to realize abovesaid objects, the push-button switch assembly mainly comprises a push button, a switch casing, a positioning lever, and a resilient contact piece, wherein the push button is depressed for positioning a protruding portion of the positioning lever to interact with a polygonal volute stairway mechanism disposed laterally in the push button, and the bottom end of the push button will prop or release the resilient contact piece directly to conductively actuate a power supply or not.
For more detailed information regarding this invention together with further advantages or features thereof, at least an example of preferred embodiment will be elucidated below with reference to the annexed drawings.
REFERENCES:
patent: 4167720 (1979-09-01), Krasser
patent: 4218598 (1980-08-01), Iwasaki et al.
patent: 4404436 (1983-09-01), Ohba
patent: 4531026 (1985-07-01), Terajima et al.
patent: 4543459 (1985-09-01), Hayashida
patent: 4827087 (1989-05-01), Niinuma et al.
patent: 4937548 (1990-06-01), Sdunek
patent: 5223813 (1993-06-01), Cambreleng et al.
patent: 5451729 (1995-09-01), Onderka et al.
patent: 5558211 (1996-09-01), Heydner et al.
patent: 5711414 (1998-01-01), Nishitani et al.
patent: 5823326 (1998-10-01), Saito et al.
patent: 6028274 (2000-02-01), Harris
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