Instruction Manual

INSTALLATION INSTRUCTIONS
Figure 17 Bascule Bridge Safety Leg Detail (Sheet 1)
A
HINGE CHANNEL
BRIDGE
SAFETY LEG #2 SHOWN IN
FULLY EXTENDED POSITION
24" (MIN)
CUTOUT
ADJUST (AGAINST A LIFTING CYLINDER)
TO TRIP AS SAFETY LEGS JUST CLEAR THE TOP OF THE CURB ANGLES. ADJUSTMENT
AND DRESSES HOSES FROM
COUPLINGS TO POWER UNIT.
1/4" COUPLINGS ON BRIDGE
PRE-PIPED TO SAFETY LEG
POWER UNIT SHOWN MOUNTED ON CUTOUT.
RAMS. INSTALLER CONNECTS
CYLINDER
A
BRIDGE POSITION LIMIT SWITCH.
IS BY INSTALLER.
CYLINDER
SECTION A-A
HINGE CHANNEL
CURB ANGLES
BRIDGE
SAFETY LEG POSITION SHOWN IN PHANTOM
SAFETY LEG #2 FULLY EXTENDED LIMIT SWITCH.
ADJUST TO TRIP WHEN SAETY LEGS ARE FULLY
SAFETY LEG #2 FULLY RETRACED LIMIT SWITCH.
ADJUST TO TRIP WHEN SAFETY LEGS ARE FULLY
1" CLEARANCE (WHEN BRIDGE IS FULLY VERTICAL)
EXTENDED. ADJUSTMENT BY INSTALLER.
RETRACTED. ADJUSTMENT BY INSTALLER.
SAFETY LEG #1 SHOWN IN
FULLY RETRACTED POSITION
SAFETY LEG #2
SAFETY LEG HINGE
BRIDGE
WITH BRIDGE FULLY LOWERED.
HINGE CHANNEL
NOTE:
INSTALLER TO CONNECT AND DRESS ALL HYDRAULIC
HOSES SUCH THAT THEY WILL RAMAIN WITHIN THE
24 3/4" CUTOUT AREA.
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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