Autoquip BASCULE BRIDGE - DOUBLE LEAF - Manual (Page 24)

INSTALLATION INSTRUCTIONS
Figure 17 Bascule Bridge Safety Leg Detail (Sheet 1)
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BASCULE BRIDGE AND SAFETY LEG OPERATION
UP: PRESSING THE "UP" BUTTON WILL CAUSE THE PUMP MOTOR TO START AND THE BRIDGE TO
RAISE. AS THE BRIDGE APPROACHES VERTICAL AND THE SAFETY LEGS CLEAR THE CURB ANGLE,
THE SAFETY LEGS WILL BE POWERED OUT. WHEN THE SAFETY LEGS ARE FULLY EXTENDED, THE
POWER UNIT IS AUTOMATICALLY SHUT OFF. THE "UP" PUISHBUTTON CAN BE RELEASED AT THIS
TIME.
DOWN: PRESSING THE "DOWN" PUSHBUTTON WHEN THE BRIDGE IS UP WILL CAUSE THE PUMP MOTOR
TO START MOMENTARILY. THE BRIDGE WILL RAISE SLIGHTLY AND THE SAFETY LEGS WILL BE
POWERED IN. THE PUMP MOTOR THEN STOPS AND THE BRIDGE WILL LOWER. WHEN THE
BRIDGE IS FULLY LOWERED RELEASE THE "DOWN" PUSHBUTTON.
THE PUSHBUTTONS ARE CONSTANT PRESSURE (DEAD-MAN TYPE). RELEASING A PUSHBUTTON
AT ANY TIME DURING BRIDGE OPERATION WILL STOP THE BRIDGE AT THAT POINT.
NOTES: THE SAFETY LEGS ARE SAFETY DEVICES WITH A TWO-FOLD FUNCTION:
(1) IF THE BRIDGE IS LEFT UP OVER A LONG PERIOD OF TIME, POSSIBLY OVER A WEEKEND, A SLOW
DOWNWARD DRIFT MAY OCCUR DUE TO NORMAL LEAKAGE TOLERANCES OF ANY VALVE. THE
SAFETY LEG WILL CONTACT THE CURB ANGLE, STOP THE BRIDGE AND MAINTAIN IT'S VERTICAL
POSITION.
(2) IF THE BRIDGE WERE TO EXPERIENCE LOSS OF HYDRAULIC PRESSURE WHEN IN THE VERTICAL
POSITION, THE SAFETY LEGS WOULD SUPPORT THE BRIDGE AND MAINTAIN IT'S VERTICAL
POSITION. THE BRIDGE MUST BE MOMENTARILY POWERED UP AND THE SAFETY LEGS POWERED
INWARD BEFORE THE BRIDGE WILL LOWER. THE BRIDGE MUST HAVE A PROPERLY FUNCTIONING
HYDRAULIC SYSTEM (SUPPLYING HYDRAULIC POWER) FOR THE BRIDGE TO LOWER. THE BRIDGE
WOULD MAINTAIN ITS VERTICAL POSITION UNTIL REPAIRS ARE MADE.
- THE SAFETY LEGS DO NOT REST ON THE CURB ANGLE IN NORMAL BRIDGE OPERATION. THEY
PERFORM THEIR FUNCTION AS NOTED IN ITEMS #1 & #2 ABOVE.
- THE 1" CLEARANCE ALLOWS THE SAFETY LEGS CLEARANCE WHILE BEING POWERED OUT AND IN.
IF THE BRIDGE SHOULD DRIFT DOWNWARD AND THE SAFETY LEGS REST ON THE CURB ANGLE,
THE ENTIRE BRIDGE WILL STILL REMAIN WITHIN THE 24" CUTOUT (MINIMUM), AS STATED ON THE
ELEVATION VIEW.
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