Telephone alerter

Details Telephone alerter Telephone alerter

1991-05-29

1993-12-28

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

381205, 381188, 379429, H04M 104

Patent

active

052747018

ABSTRACT:
In a telephone alerter a transducer disc is held onto a printed circuit board by an annular housing which is detachable from the board. The housing has spaced feet which are received through apertures in the board and the housing is then rotated to engage the feet with one side of the board and hold the housing in position. The transducer disc is easily removed by rotating the housing in the opposite direction to withdraw it from the printed circuit board. Preferably, the disc is retained within the housing by an O-ring retainer which is compressed between the printed circuit board and the disc. Upon removal of the housing, the disc and retainer may then be immediately withdrawn from the housing.

REFERENCES:
patent: 3180606 (1962-12-01), Sabin et al.
patent: 4284857 (1981-08-01), Slavin et al.
patent: 4507800 (1985-03-01), Kelly
patent: 4574272 (1986-03-01), Brown
patent: 4691363 (1987-09-01), Khanna
patent: 4733748 (1988-03-01), Ponticelli, Jr.

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