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Ray and Koop Ferwerda's Telescopic Excavator | Construction Equipment


By Tom Berry, HCEA | January 22, 2021
Sometime around 1940, contractors Ray and Koop Ferwerda of Cleveland, Ohio, encountered a situation that required slope work that could only be done manually.
Given the scarcity of labor at the time, something else was needed. They rigged up a primitive hydraulic machine with a blade at the end of a telescopic boom and mounted it to a circle on an old truck. Seeing that they were on to something, they soon redesigned the boom to a triangular cross-section for greater rigidity and added a mechanism to rotate the boom 45 degrees left and right. By 1945, the machine had been designated the Gradall, and excavating buckets were available for it. ....

United States , Bowling Green , Koop Ferwerda , Warner Swasey , Historical Construction Equipment Association , National Construction Equipment Museum , Equipment Echoes , ஒன்றுபட்டது மாநிலங்களில் , பந்துவீச்சு பச்சை , வரலாற்று கட்டுமானம் உபகரணங்கள் சங்கம் , தேசிய கட்டுமானம் உபகரணங்கள் அருங்காட்சியகம் , உபகரணங்கள் எதிரொலிக்கிறது ,