(57) The purpose of the invention is to provide a portable alarm device for the protection
of handbags, purses or any other object needing a protection system bound to the distance
of the owner from the object to protect.
The invention is made in two separate parts: the first part is to be held by the owner
of the object to protect, the second is to be placed inside the object to protect.
For practical reasons we will here call the first part TRANSMITTER (figure 1) and
the second part RECEIVER, but the systems of the two parts are actually composed by
two battery supplied wireless signal transceivers. In detail, the transmitter's characteristic
is the activation of a visual and acoustic alarm that it contains whenever it is drawn
out of the receiver's established metrical action range. This action range is set
directly on the transmitter by the owner.
Practically, the transmitter sends periodic coded calling signal towards its receiver
and awaits an answering signal. The transmitter and receiver dialogue with a wireless
signal in a 128 bit electronic key, this allows the realization of a system which
can in no way be affected by the presence of any other identical alarm device that
may be present in the same action range.
Although this system may present various forms, for a practical and easy use the transmitter
can be built in the form of a key ring and the receiver in that of a common credit
card in order to carry it easily in a wallet.
The transmitter's alarm siren can only be inactivated manually or by bringing the
transmitter and receiver back in the established action range.
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