This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
To prevent any mishap when coasting in a boy's play wagon fasten the tongue with a coil spring so that it will be kept in a vertical position. The tongue is always out of the way when it is not used for drawing the wagon. The spring is only strong enough to hold the tongue, so that when this is used for pulling there is little or no tendency of the spring to draw the tongue upward. The coil spring is fastened with one screweye in the tongue and one in the front axle. - Contributed by Wm. F. Benson, Brockton, Massachusetts.
Ill: Holder for the Wagon Tongue to Keep It in a Vertical Position When Not in Use