Abstract: The disclosed switch mechanism consists of two toggle arm type linkages connected to a switch actuator, powered by a dual torsion bar spring, each linkage working in opposition to the other. Thus, a net resultant force is exerted on the switch actuator locating the associated switch mechanism in either of two stable positions with the net resultant force being equal to the difference between the forces generated by the two torsion bar spring arms and applied by the two toggle arms to the switch actuator.
Type:
Grant
Filed:
May 19, 1976
Date of Patent:
July 25, 1978
Assignee:
Bell Telephone Laboratories, Incorporated
Inventors:
Ernest Gerard DeNigris, Merle Victor Olsen
Abstract: A PBX call restriction arrangement is disclosed in which a plurality of call rerouting schemes are concurrently provided. The class of service assigned each station is used to define both the types of calls prohibited to the station and the rerouting treatment to be given an attempt by a subscriber at this station to make this prohibited type of call.
Type:
Grant
Filed:
July 26, 1977
Date of Patent:
June 20, 1978
Assignee:
Bell Telephone Laboratories, Incorporated
Inventors:
Richard Duane Burtness, Louis Emanuel Thelemaque
Abstract: A key telephone system signal priority arrangement is disclosed wherein each type of call in a key telephone system is assigned a distinctive priority. When a call is directed to a station engaged in an existing lower priority call, a warning tone is given to both parties engaged in this existing call. The existing call is then automatically placed on hold while the preempting call is completed to the called station such that the called station can answer the preempting call "hands-free".
Type:
Grant
Filed:
May 24, 1976
Date of Patent:
June 20, 1978
Assignee:
Bell Telephone Laboratories, Incorporated
Inventors:
Richard Henry Bidlack, Wayne Jay Egan, Steven Gary Miller