Automatically engaged traffic sign
First Claim
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1. An automatically engaged traffic sign comprisinga traffic sign;
- a curtain to conceal the traffic sign;
a spring-loaded roller for rolling up the curtain when the traffic sign is to be displayed;
a cable attached to the curtain;
a pulley for winding the cable to draw the curtain into a closed position;
a motor attached to said pulley;
a cam with at least one finger that is rigidly connected to the pulley;
a latch disposed to engage the finger on the cam when the curtain is in a closed position;
an actuating mechanism to disengage the latch when a power failure is detected.
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Abstract
The present invention describes a sealed, automatic sign that displays a traffic sign (such as a stop or yield sign) visible when the power to the sign is interrupted. The sign has a shade, which covers the stop sign within the frame work while the power is on. When the power is interrupted, the shade lowers, revealing the traffic sign. When power is returned the shade is then drawn up to its original state, concealing the traffic sign.
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Citations
11 Claims
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1. An automatically engaged traffic sign comprising
a traffic sign; -
a curtain to conceal the traffic sign; a spring-loaded roller for rolling up the curtain when the traffic sign is to be displayed; a cable attached to the curtain; a pulley for winding the cable to draw the curtain into a closed position; a motor attached to said pulley; a cam with at least one finger that is rigidly connected to the pulley; a latch disposed to engage the finger on the cam when the curtain is in a closed position; an actuating mechanism to disengage the latch when a power failure is detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification