초록 ▼

The personal safety radio device is carried by the person to be protected on a mounting device, for instance incorporated in the heel of a work shoe, and includes a transmitter powered by a current source specific to the device, a receiver and an antenna arrangement. In order to ensure a high operat

The personal safety radio device is carried by the person to be protected on a mounting device, for instance incorporated in the heel of a work shoe, and includes a transmitter powered by a current source specific to the device, a receiver and an antenna arrangement. In order to ensure a high operational reliability and a long maintenance-free service life at a high range of transmission the device- specific current source is a rechargeable accumulator which may be charged by a generator arrangement including a piezo-electric converter during the operational useage of the device. The piezo-electric converter is so arranged in the work shoe that it is acted on by the weight of the person wearing the work shoe and thus converts the pressure of the weight into electrical energy.

대표청구항 ▼

In combination with a shoe, a personal safety radio device comprising: transmission means for producing transmission signals; at least one rechargeable accumulator constituting a current source for supplying the transmission means; receiver means responsive to at least one predetermined frequency; m

In combination with a shoe, a personal safety radio device comprising: transmission means for producing transmission signals; at least one rechargeable accumulator constituting a current source for supplying the transmission means; receiver means responsive to at least one predetermined frequency; means for coupling the transmission means to the accumulator, said coupling means including a supply current circuit and switching means, wherein said receiver means is coupled to said switching means and actuates the switching means to activate the transmission means in order to close the supply current circuit between the accumulator and the transmission means when the at least one predetermined frequency is received by the receiver; and generator means coupled to the accumulator for charging the accumulator during use of the protective radio device, whereby a compact, mobile personal safety radio device having a high operational reliability and long service life is provided.