HD Torsion Ramp Spring

Ramp spring is designed as a "lift assist" for trailer ramps.

• Right Hand Ramp Spring
• High quality steel alloy
• Provides approximately 90 degrees of deflection
• Measurement of spring legs from coil to tip: 3.75"
• Width of coil: 2-1/2"
• Overall length: 11"
• I.D. of coil: 1-1/2"

Trailer Ramp Springs:
Specifications and How to Use Them

Trailer ramp springs are created by making a coil out of spring
tempered metal wires. Both ends of a trailer ramp spring stick out like a
lever. The specifications for our universal trailer ramp springs are as
follows:

1. Our springs have an inside diameter of 1 5/8" and will work on
   shafts that have a maximum outside diameter of up to 1 1/2" or less.
2. Our springs need to have a distance of at least 1 1/2" from the
   shaft’s center to the edge of the ramp or the edge of the trailer’s
   frame as this allows the clearance needed for the spring to operate.
   Example:
   If the shaft diameter is 1 ½”, half the diameter is the center of the shaft. (1 ½”=3/4”)
   ¾” (half of shaft diameter) + ½” (spring wire diameter) = 1 ¼”,
   which allows ¼” gap between the outside of the spring and trailer frame.
3. Our springs require a distance of at least 4" between the two hinge
   brackets that hold the shaft together as the spring body length is 3
   5/8”, but the spring will expand when in loaded position.
4. Our springs’ deflection is up to 125 degrees. Any more than that and
   the ramp can still be raised, but there will not be any more load
   assist.
5. Our springs can provide a torque of 2000 in/lbs at a 90 degree
   deflection. In order for you to determine the approximate amount of
   torque needed by your ramp, you need to figure out the weight of the
   ramp and the ramp length in inches. Then, divide the length of the ramp
   by two and multiply it by its weight. For example, if you come up with
   4000 in/lbs, that means you will need to use two trailer ramp springs
   for your ramp. For 6000 in/lbs, three springs are needed, and so on.
6. When installing trailer ramp springs, keep in mind that the
   direction of the coils is important. Lay the spring on its side (resting
   on the ends of the coils) looking at end of coils then follow coils as
   they are down and away, if the movement is counter clockwise than this
   is a left hand wind. If it is clockwise, it is a right hand wind. When
   the spring is in use, or when the ramp is lowered, the coils should be
   tightening to prevent premature failure.
7. The best way to attach springs is by mechanical attachment. Do not
   weld trailer ramp springs, as very high temperatures will change the
   molecular structure of the spring material causing it to become weak and
   brittle.