Monitoring arrangement
First Claim
1. An apparatus for monitoring the time duration of a person within a given closed region comprising:
- a portable transmitter assembly to be carried by the person to be monitored for emitting electromagnetic energy and comprising, an energy source, a timing member which, when the transmitter is handed to the person at a first point, is adjusted to a given time duration determined by the normal travel time between said first point and a second point, said timing member being operative, after termination of the adjusted time duration, to energize a transmitter stage to transmit a given information signal, and at least one receiver which, when the transmitted given information signal is received, activates an indication device.
1 Assignment
0 Petitions
Accused Products
Abstract
Apparatus for monitoring the time duration in which a visitor remains in a defined region on the way from a visited place to another place, more particularly from the entry to the visited place and back, freely and without supervision. At the entry place, the visitor receives a transmitter with a timing member. After termination of a given time duration which corresponds to the normal travelling time of the visitor between the visited places, the transmitter transmits an individual identification signal which is received by a central receiver and is decoded. It can be immediately ascertained which visitor dwells for too long a time within the defined region so that searching or controlling measures can be initiated.
13 Citations
16 Claims
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1. An apparatus for monitoring the time duration of a person within a given closed region comprising:
- a portable transmitter assembly to be carried by the person to be monitored for emitting electromagnetic energy and comprising, an energy source, a timing member which, when the transmitter is handed to the person at a first point, is adjusted to a given time duration determined by the normal travel time between said first point and a second point, said timing member being operative, after termination of the adjusted time duration, to energize a transmitter stage to transmit a given information signal, and at least one receiver which, when the transmitted given information signal is received, activates an indication device.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A portable wireless transmitter assembly for use in a system for monitoring the time in which a person is present within a protected region, said system including a portable radio transmitter to be carried by the monitored person and a central receiver remote from the transmitter and responsive to an electric signal transmitted by the radio transmitter, said portable wireless transmitter assembly comprising:
- a radio transmitter for transmitting a given information signal, an adjustable timing member for activating the radio transmitter after a predetermined time period adjusted at a first location where the portable transmitter assembly is received by the monitored person, said adjusted time period being determined by the normal travel time of a person between said first location and a second location within said protected region, and a self-contained energy source for supplying electric energy to said radio transmitter and to said timing member.
- View Dependent Claims (12, 13, 14, 15, 16)
Specification