| 摘要 |
<p>An untied shoelace warning system (12, 40, 50, 70) with first (16, 20) and second (18, 22) conductive shoelace segments coupled to an indicator (24) that activates when the shoelace segments do not touch, and does not activate when the shoelace segments do touch. The first and second conductive shoelace segments and the indicator are coupled to a battery (26) and a switch (28). The switch activates the indicator when the shoelace segments are not touching, and does not activate the indicator when the shoelace segments are touching. The untied shoelace warning system further includes a pressure sensor (30) so that when the pressure sensor does not sense pressure and the first and second conductive shoelace segments coupled to an indicator are not touching, the indicator does not activate. The untied shoelace warning system does not activate the indicator when the shoe that is tied with the first and second shoelace segments is not being worn. The indicator may be a sound device, e.g., a piezoelectric buzzer, a light or a series of lights, e.g., light emitting diodes or LED's, a vibrating device, or a combination of the aforementioned devices. The switch (28) may be a relay, a transistor, a Darlington amplifier, or a microprocessor.</p> |
