US 3,947,641 AGranted

Use of public subscriber telephone network; method and apparatus

OwnerAnders Edvard Trellinventor

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Abstract

Chiefly by means restricting/specifying the telephone numbers possible to dial from a door-attached and else to its purpose adapted telephone, a normal public automatic subscriber telephone network in its entire ordinary functioning and capacity of communication is being used in the specific order to establish a well defined door to tenant communication situation in a house of such a door telephone, enabling a visitor to call up a tenant and seek admission through the locked door, time-limitable conversation between them, and tenant to open the door free of choice. The functioning is specific for each house, yet no extra installations or arrangements in the common telephone network or in the house are needed, but the door telephone beeing conventionally connected with the existing telephone network can without measures share its regular and new, anyway for general purposes introduced extra services to distinguish the function. Thus extra features like particular ringing and overcoming of busy line are thereby provisionable, protection against misuse is obtained, and can the door in a house that so wishes be opened from an outside distance when so called for by post men, emergency personell and the like.

Claims13

Dependent claims

The method of utilizing a public subscriber telephone network for door signalling and opening purposes by means of a telephone set connected to said telephone network, said set being arranged outside the entrance door of an apartment house or any other entrance door and intended for the purpose of communication between a visitor and a tenant inside said entrance door, when locked, said visitor thus being able to make a call from said telephone set, hereinafter called the "entrance set", to the subscriber telephone set, hereinafter called the "reply set", of any desired tenant, caretaker or other party authorized to release the entrance door lock of said entrance door, the communication thus established via said telephone network between the entrance set and the reply set enabling, apart from conversation, the called party to initiate the release of said entrance door lock, said method comprising the steps of,

employing the common public subscriber telephone network, including common automatic exchanges, common telephone numbers and common subscriber telephone sets for all communication between the entrance set and the reply set,
providing the entrance set with switching means by which it can be coupled onto a telephone line going out to the automatic exchanges of said telephone network, means for number selecting and means for verbal communication,
providing the entrance set with means connected to said entrance door lock responsive to signals received via said telephone network and induced from a reply set after establishment of telephone contact between the entrance set and any reply set for thereupon releasing said door lock, and
providing the entrance set, when intended only for contact via the telephone network with an authorized party for release of the entrance door lock, with number discriminating means, programmable for desired telephone numbers or their equivalents, for securing that only said programmed numbers will be connected through said telephone network in a way that enables reply sets to actuate the release of said entrance door lock.

1 more element

The use of a public subscriber telephone network by means of a telephone set connected to said telephone network, said set being arranged outside the entrance door of an apartment house or any other entrance door, for the purpose of communication between a visitor and a tenant inside said entrance door, when locked, said visitor thus being enabled to make a call from said telephone set, hereinafter called the "entrance set", to the subscriber telephone set, hereinafter called the "reply set", of any desired tenant, caretaker or other party authorized to release the entrance door lock of said entrance door, the communication thus established via said telephone network between the entrance set and the reply set enabling, apart from conversation, the called party to initiate the release of said entrance door lock, said use comprising the steps of,

utilizing existing public subscriber telephone network, including existing automatic exchanges, existing telephone numbers and telephone sets allready possessed by telephone subscribers acting as called party for the communication between the entrance set and the reply set,
providing the entrance set with switching means by which it can be coupled onto a telephone line going out to the automatic exchanges of said telephone network, means for number selecting and means for verbal communication,
providing the entrance set with means connectable to said entrance door lock responsive to signals received over said telephone network and induced from a reply set after establishment of telephone contact between the entrance set and any reply set for thereupon releasing said door lock, and
providing the entrance set with number discriminating means, programmable for desired telephone numbers or their equivalents, for securing that only said programmed numbers will be connected through said telephone network enabling reply sets to release said entrance door lock.

1 more element

Dependencies are inferred from the claim text.