In some ways I think all of us live with the view that all new and exciting things are probably invented in some other time era or some other place in the World. Oregon is certainly an obscure place, hardly known for its great traditions in invention or manufacturing. In spite of all this, a home grown technology company called Tektronics stood the world on end with the development of the Oscilloscope. Beyond that, the self cleaning chain for chain saws came from Oregon, and as I write, Intel is inventing their new processors not 50 miles from here.
One of the other Oregon Firsts, was the articulated loader. The Wagner brothers of Portland who contributed to the invention of the log skidder. Shown in the photos here are a pair of Scoopmobiles located and photographed in Germany in 1988. Though they found their way to Germany, they were without doubt manufactured right here in Portland Oregon. The model looks to be of what they called an LD7 or LD8 manufactured in the 1950's. The expected engine would have been a Cummins and the transmission either an Allison or a Twin Disc. The Axles are mostly likely Clark.
These machines typically had 2 hydraulic pumps, a Vickers Vane pump belt driven off the front of the engine handled the steering, and a gear pump on the converter provided oil for the loader, which operated through large hoses at modest pressures (probably around 1,000 psi).
Curiously, one of the all time favorites of the time made by Scoopmobile was not articulated at all. They made a small 3 wheeled loader. Had 2 driving wheels on the front which were 14x24 truck tires and a single tire on the rear. The cab was to one side and the loader boom was on the other side. It was powered by Chrysler Industrial 6 gas engine, which to everyone else was a Dodge flathead 6 gas engine. They generally had a Chrysler torque coupling and 1.25 yard bucket. The nifty thing about these loaders was that they had an outboard latch on the planataries. This meant that instead of having the sun gear splined on the spindle, the sun gear was outboard and a flat piece of iron slipped over the end of the planetary and extended back to the fender to hold the sun gear stationary. It was designed to be quickly removable. A towbar was provided on the single rear wheel, and the steering linkage could be dropped free which collectively made this loader very 'towable'. By pulling the planetary bars all the gear train was disconnected, and it seemed that at least around here every road department bought these things in droves, as they could readily be towed behind even a 5 yard dump truck. this was particularly handy because at the time it was customary for road departments to have stockpile sites in many locations with gravel. With one of these, a small dump truck could tow the loader to the stock pile site for the day, use it there and take it back to the shop at night.
Special thanks to Thomas Bauman for the photos.