Electricity: circuit makers and breakers – Solid contact – Push button operated
Reexamination Certificate
2000-02-17
2001-07-03
Scott, J. R. (Department: 2832)
Electricity: circuit makers and breakers
Solid contact
Push button operated
C200S461000, C200S467000, C200S539000, C200S553000
Reexamination Certificate
active
06255611
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to an improved pushbutton switch, and particularly to a pushbutton switch and that can solve the problem of sticking or welding of the common contact point caused by sparks created in the switching process.
A typical conventional switch, such as a microswitch, usually contains a housing including a press unit, a driving element, a switching unit, and a plurality of conductive pins.
One end of an elastic element of the switching unit is connected with the driving element while the other end is connected with a sway element. When an external force is applied onto the press unit, the bottom end of the press unit will press against the driving element to in turn push an elastic element to drive the sway element for switching a common contact point from a contact position in which it contacts a third conductive pin to another contact position in which it contacts a second conductive pin in order to supply power or signals to a load linked with the second conductive pin.
However, in the conventional switch, because the elastic element is driven indirectly, it requires a relatively larger external force to be applied onto the press unit. In addition it is difficult for a maker to cram the abovesaid units or elements into the limited space of the housing resulting in increased assembly costs.
Moreover, because the conventional switch lacks a way to overcome welding or sticking of the sway element to one of the conductive pins driving switching process, operation failure may occur from time to time.
SUMMARY OF THE INVENTION
The primary object of this invention is to provide an improved structure of a pushbutton switch, wherein one end of an elastic element of a switching unit is coupled with a pushbutton unit. When an external force is applied the pushbutton unit, the jointed end of the pushbutton unit and the elastic element is forced to move downwards until it passes a critical line, at which point the sway element is coupled with another conductive pin to supply power or signals.
Another object of this invention is to provide an improved structure of a pushbutton switch wherein a push-to-press portion is used to push a contact point of a sway element away in case the sway element is welded and stuck to a third or a second conductive pin by sparks. As to 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: 2743331 (1956-04-01), Lauder et al.
patent: 3056866 (1962-10-01), Karleen
patent: 4011419 (1977-03-01), Anderson
patent: 4045632 (1977-08-01), Pierott
patent: 4055734 (1977-10-01), Hayden
patent: 4230919 (1980-10-01), Schantz et al.
patent: 4348563 (1982-09-01), Henville
patent: 4362910 (1982-12-01), Boebel et al.
patent: 4394553 (1983-07-01), Feil
patent: 4636597 (1987-01-01), Menche
patent: 4673778 (1987-06-01), Lewandowski et al.
patent: 4877930 (1989-10-01), Fukuma
patent: 4902863 (1990-02-01), Fukuma
patent: 4904832 (1990-02-01), Nagahara et al.
patent: 5171945 (1992-12-01), Su
patent: 5453590 (1995-09-01), Mayer
patent: 5566819 (1996-10-01), Lustgarten et al.
patent: 5717177 (1998-02-01), Tsai et al.
Bacon & Thomas PLLC
Scott J. R.
Shin Jiuh Corp.
LandOfFree
Pushbutton switch does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pushbutton switch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pushbutton switch will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2549469