Taken from Scientific American Aug 13, 1887
AN IMPROVED OX BOW
The invention herewith illustrated provides an ox bow which will not bear upon the windpipe or the veins or arteries of the neck and has been patented by Mr Luman Rundell, of Grapeville NY. The bow as represented is formed partly of wood and partly metal, the metal portion being made tubular and forming an enlarged lower part of the bow, which is of sufficient size to relieve the lower part of the throat of ox from any pressure of the bow. It may, however, be made entirely of wood bent into the form shown, even of a piece of gas pipe bent into suitable form.
The actual patent is linked below.