Title: Home intercom telephone set

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Claims: I claim:

1. A telephone for use in an intercom system having a similar second telephone, the telephone comprising:

a prefabricated unit comprising a supporting plate having attached thereto electrical connecting lines including dimensionally stable wire stirrups forming a first, second and third pair of contact pins;

a case enclosing said electrical connecting lines and detachably secured to said supporting plate;

a ringing unit electrically connected to said electrical connecting lines;

a receiver having assembled therein a speaking unit comprising a microphone and a loudspeaker electrically connected to said electrical connecting lines,

wherein said receiver is removably held by said case; means for connecting a current source to said electrical connecting lines;

means for electrically connecting the second telephone to said electrical connecting lines;

an electrically conductive selector device selectively movable into and out of contact with said first pair of contact pins to establish or break electrical connection therebetween, wherein said selector device comprises a first spring element normally biased out of contact with said first pair of contact pins;

a ringing key for energizing the ringing unit of the second telephone when said ringing key is actuated, wherein said ringing key cooperates with said selector device to move said selector device against its normal spring bias and into contact with said first pair of contact pins when said ringing key is actuated;

an electrically conductive switching device selectively movable into contact with said second and third pairs of contact pins to selectively establish electrical connection between contact pins of each said pair, wherein said switching device comprises a second spring element normally biased into contact with said third pair of contact pins; and

a reversing key having a first position for connecting said ringing unit into an electrical circuit including the selector device of the second telephone and a second position for connecting said speaking unit into an electrical circuit including the speaking unit of the second telephone when its reversing key is in the second position and for connecting said selector device into an electrical circuit including the ringing unit of the second telephone when its reversing key is in its first position, wherein said switching device and said receiver cooperate with said reversing key to move said reversing key into its first position when said receiver is held by said case and establish electrical connection between said second pair of contact pins by moving said switching device against its normal bias and to move said reversing key into its second position when said receiver is removed from said case and establish electrical connection between said third pair of contact pins by permitting said switching device to move according to its normal bias.

Other info:

Inventors: Brandstatter, Horst (Zirndorf, DT)

Application Number: 620595
Filing Date: 1975-10-08
Publication_date: 1977-01-04
Assignee:
Primary Class(es): 379/167.01 379/435
Other Classes:
US Patent Ref:

2763719	Sep, 1956	Schoeneberg	179/1.
2912502	Nov, 1959	Talcott	179/1.
3126454	Mar, 1964	Fresk et al.	179/100.
3345466	Oct, 1967	Rahmig	179/1.
3594515	Jul, 1971	Brown	179/100.
3657487	Apr, 1972	Schwanck et al.	179/100.
3924073	Dec, 1975	Brandsratter	179/1.

Other Refs:
Primary Examiner: Claffy, Kathleen H.
Assistant Examiner: Myers, Randall P.
Attorney: Dorsey, Windhorst, Hannaford, Whitney & Halladay