King road drag

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David Ward King, Inventor of the King Road Drag
Contemporary Drawing of the King Road Drag
Road Before King Road Drag
King Road Drag in Operation
Crowned Center after Use of King Road Drag
Road Drag Patent

The King road drag (also known as the Missouri road drag and the split log road drag) was a road grader implement for grading dirt roads that revolutionized the maintenance of the dirt roads in the early 1900s. It was invented by David Ward King, who went by "D. Ward King" and who was a farmer whose farm was in Holt Township, near Maitland, Missouri.

It started out as two parallel logs with the cut side facing the front separated three feet by rigid separators and pulled by a team of two horses. Variations of the two-plank drag design but pulled by trucks or tractors are still used today to smooth the dirt infields of baseball diamonds.[1]

In this simple design, the first log would remove clods and the second log would smooth the road. The logs were staggered so that dirt would be pushed to the center to create a crown so that water would rush off.

The very simple design replaced the old practice of dragging a road with a single log which left the surface unrepaired and rut filled. It also made it possible for farmers to improve roads near their homes without having to wait for government graders.

D. Ward King of Maitland, Missouri requested a patent for the process in 1907 and received Patent 884,497 in 1908.[2] He widely publicized the process in a U.S. Department of Agriculture Farmers' Bulletin #321 in 1908 under the title The use of the split-log drag on earth roads[3] An important component of the grading process was that it had to occur when the road was wet.

This invention was the horse drawn forerunner of the modern day road grader. It was a sensation in its day. States passed laws requiring its use. The design was so simple that King did not enforce his patent rights. However he did tour the country explaining to how to use it.[4] He also wrote articles such as one that appeared in the May 7, 1910 issue of the Saturday Evening Post entitled “Good Roads Without Money.”

King would further enhance his invention with his patent 1,102,671 in 1914 which included four bars and two triangular scrapers.[5]

Before the King Road Drag, dirt roads turned into a quagmire when they were wet—especially in the winter.

The widespread use of the King Road Drag came along during the Good Roads Movement, driven by bicyclists and later by automobile drivers. Automobiles benefitted since Macadam roads were rapidly destabilized by cars, which sucked the cementing dust out of smooth macadam roads.[6] Solid roads meant people could use their automobiles on the roads between cities. Solid rural roads also made possible reliable rural mail delivery, which did much to promote commerce in the United States between city based businesses and the rural population. For instance, they allowed Sears and Roebuck to start sending out its catalogues to small towns and farms and thereby vastly increase the size of its customer base.[7]

External links[edit]


  1. ^ Field Drag -
  2. ^ Patent Filed Jul 8, 1907 and issued Apr 14, 1908
  3. ^
  4. ^ Centennial History of Missouri - By Walter B. Steavens - S. J. Clarke Publishing Company - 1921
  5. ^ Patent Application - Jan 19, 1911 – Issued July 1914
  6. ^ Claudy, C.H. "The Right Road—and Why," The Independent, New York, Volume 99, July, August, September 1919, 228. Retrieved on 2009-11-3.
  7. ^ Malcolm Gladwell, The New Yorker, December 6, 1999, Don't believe the Internet hype: the real E-commerce revolution happened off-line. Historic Importance of King Road Drag