Patent for improvement in car-coupler particularly to that known as “swing-pin.” This is how it works “a pin comprises a pin proper whose upper end is connected by a chain with the front end of the arm on a horizontal rod. The body of this pin passes through a catch, from which it may be removed.” (Lines 40-45) “The catch has a transverse pin and a rounded upper edge, terminating in a shoulder at its front end and a tongue at its rear end.” (Lines 46-49) Illustration is included.