Electricity: circuit makers and breakers – Electric switch details – Cases and bases
Patent
1997-04-07
1998-05-05
Walczak, David J.
Electricity: circuit makers and breakers
Electric switch details
Cases and bases
200293, 200330, 200512, H01H 902
Patent
active
057463077
ABSTRACT:
The PTT assembly (100) self locates and then locks a back support plate (106) and switches (146, 148) directly to an inner surface (134) of a housing wall (132). On the outer surface (136) of the housing wall (132), keypad plungers (116) self locate through holes (140) in the housing wall. The perimeter of the keypad itself is retained by a bezel (110) that snaps into the housing (132). A hook (130) extends from the bezel (110) to lock and fix the travel distance of the plungers (116) to the switches (146, 148). With the back support plate (106) firmly in place, the keypad actuation force remains consistent since the travel distance of the plungers (116) to the switches (146, 148) is fixed by the hook (130) length. Additionally, the back support plate (106) supports the switches without bowing under the applied plunger force further ensuring a consistent actuation force.
REFERENCES:
patent: 4845325 (1989-07-01), Burchett et al.
patent: 5213204 (1993-05-01), Sommer
patent: 5618212 (1997-04-01), Moore
patent: 5629504 (1997-05-01), Chang
Auld David
Castaneda Julio C.
Finch Steven J.
Jensen Tyler D.
Joss Steve M.
Doutre Barbara R.
Motorola Inc.
Walczak David J.
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