Swingletree
![A swingletree in use in a light cart. The swingletree is the triangular piece in the foreground; the traces are the leather straps leading forward from this. (Swingletrees are more commonly a simple bar, not a triangle.)](/Images/godic/202502/14/Welsh_Cob_with_swingletree4844.JPG")
A swingletree (British Isles) or singletree (North America) is a wooden or metal bar used to balance the pull of a draught horse or other draught animal when pulling a vehicle. It is a kind of whippletree, and the term is also used sometimes for other whippletrees.