W1711 Rough Draft of Patent Letter by William Dunn
Jan 1 1885
From: Inventor Institute [New York]
I claim the [part??] of operating the Hook-Bar by a Crank-Arm the shaft of which passes through the pivot end of the Hook-Bar and upon which Crank-Shaft the Hook-Bar rotates. the Crank-shaft is constructed with round ends of different diameters and has flatted sides in the central part. The object of this construction of the shaft is the round parts form the bearing in the Drawhead and allow the shaft to rotate and the flatter portion of the shaft passes through the Hook-Bar enables the Crank to operate the Hook and dispenses with screws, keys [??] or other devices which would be required to prevent the shaft from turning in the Bar.
1 This handwritten note was written on the back of an advertisement for space at the permanent exhibition at the Cooper Union Building in New York city (W1709). It appears to be a partial draft of specifications for Dunn's improvements on his own train car coupler, see W1707, W1712, W2656, W2667, W1532, W2671, W2675, W1714, W1716, W1721, W1741. For more on Dunn, see W2554a.