Water-and-dust-proof push-button switch housing dummy terminal for air venting
First Claim
1. In a push button switch having a water- and dust-proof construction comprising an insulating case with an open top and closed bottom and sidewalls, a flexible sealing member for sealing the open top of the insulating case, a movable stem having an inner side and having an outer side in constraining contact with the inner surface of said flexible sealing member, a first electrical contact fixed on said bottom wall of said insulating case, a pair of electrical terminals having ends extending through a side or bottom wall of said insulating case to be soldered to an external printed circuit board, a movable second electrical contact disposed on said pair of electrical terminals and in constraining contact with the inner side of said stem and movable upon application of an external depressing force thereto from outside said insulating case to close an electrical circuit when said movable electrical contact contacts said first electrical contact;
- the improvement comprising;
a dummy terminal extending through one side wall and forming a fine air gap through one said wall leading from the outside into the inside of said insulating case, said dummy terminal being positioned in said one side wall and spaced from said electrical terminals so that solder applied to said pair of electrical terminals does not reach said dummy terminal, whereby said fine air gap allows communication of air into the insulating case to equalize the air pressure between the inside and the outside of the insulating case while dust and water may not enter the case.
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Accused Products
Abstract
A push-button switch of a water- and dust-proof structure wherein a good operating force charateristic is always assured. The push-button switch has a dummy terminal which is not to be directly soldered to a wiring pattern and is provided at a location of the push-button switch to which flux which appears when a terminal is being soldered to the wiring pattern does not come around. When the switch is soldered to a printed circuit board for the wiring pattern, flux may not possibly enter a gap between a case of the switch and the dummy terminal. After mounting of the switch on the printed circuit board, communication of air between inside and outside the case is assured by the gaps so that the inside of the case is maintained at an equal pressure with external air.
29 Citations
5 Claims
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1. In a push button switch having a water- and dust-proof construction comprising an insulating case with an open top and closed bottom and sidewalls, a flexible sealing member for sealing the open top of the insulating case, a movable stem having an inner side and having an outer side in constraining contact with the inner surface of said flexible sealing member, a first electrical contact fixed on said bottom wall of said insulating case, a pair of electrical terminals having ends extending through a side or bottom wall of said insulating case to be soldered to an external printed circuit board, a movable second electrical contact disposed on said pair of electrical terminals and in constraining contact with the inner side of said stem and movable upon application of an external depressing force thereto from outside said insulating case to close an electrical circuit when said movable electrical contact contacts said first electrical contact;
the improvement comprising; a dummy terminal extending through one side wall and forming a fine air gap through one said wall leading from the outside into the inside of said insulating case, said dummy terminal being positioned in said one side wall and spaced from said electrical terminals so that solder applied to said pair of electrical terminals does not reach said dummy terminal, whereby said fine air gap allows communication of air into the insulating case to equalize the air pressure between the inside and the outside of the insulating case while dust and water may not enter the case. - View Dependent Claims (2, 3, 4, 5)
Specification