Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1977-11-28
1979-04-17
Ross, Herbert F.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200292, H01H 312, H05K 104
Patent
active
041502728
ABSTRACT:
The invention relates to a contact mechanism suitable for application to printed circuits arranged on a board and may by employed in a telephone set comprising push button means. The mechanism consists of a first contact member in the form of a leaf spring having two legs and between these a tongue part, the middle portion of which has an inwardly curved bent part and the lower portion of which has two narrow taps carrying the contact elements. The first contact member is placed in upright position along a groove in a bottom plate. A second contact member consists of a small T-shaped metal plate which is fastened oppositely to said taps in a notch of the groove and carries a contact element. The contact mechanism is actuated when a button is depressed, whereby a curved part of the button engages the bent part and forces the tongue part to move into contact with the second contact member.
REFERENCES:
patent: 3392250 (1968-07-01), Ziegler et al.
patent: 3433914 (1969-03-01), Ericsson
patent: 3870840 (1975-03-01), Rivetta et al.
patent: 3924090 (1975-12-01), Chao et al.
patent: 3996429 (1976-12-01), Chu et al.
Bruun Jan F.
Sommansson Peter S. E.
Ross Herbert F.
Telefonaktiebolaget L M Ericsson
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