Lifter on Incline
Although it wasn't apparent when I started working on various Lifter models, I realized that by off setting the fulcrums the Carriage could be made to swing forward. All that was needed was a vertical support that could move along with the Carriage. The video shows a rough design of such a Lifter. It consists of the Carriage, a vertical support and a method of tilting. The payload shows a solid block that weighs about 33 pounds and the Carriage weighs about 3 pounds. The force required to tilt the Carriage, using an extended Tilt Arm is around 6 pounds. This is the approximate weight of the "mule" running on the Tilt Arm.
The incline, provided by the Extended Tilt Arm, gives an MA of 5 which applies to the movement of the mule. The 6 volt motor on the "mule" provides enough torque to pull it back and forth on the tilt arm and tilt the Carriage as it does. A tilt of 11-12 degrees raises the base of the Carriage, at the fulcrums, about 3/4". By giving the Carriage the ability to rotate on its fulcrums, the Carriage will move up the 11-12 degree incline. The angle of the incline in this example is set low, but it could be increased up to 90 degrees.
Lifter on an Incline
By matching the number of tilts needed to raise the Carriage to the desired height and the distance the Carriage swings, one can determine the angle of the incline on which a particular Lifter design will work and be most efficient. The greater the incline angle the smaller will be the swing distance.
Note: In the video I refer to the height and width of the Carriage as providing a Mechanical Advantage (MA). The fulcrum placement, the tilt angle and the length of the tilt assist arm all contribute to the overall MA. Look at the Section: A Little Math for an explanation.