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W1741 EXCERPTS FROM U.S. PATENT OFFICE REGARDING WILLIAM DUNN'S TRAIN CAR COUPLERS
Apr 7 1885 1
To:
From:

UNITED STATES PATENT OFFICE
-----------------------------------
WILLIAM DUNN, OF NEW YORK, N.Y., ASSIGNOR TO CALVIN B. MCQUESTEN OF SAME PLACE

CAR COUPLING
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SPECIFICATION forming part of Letters Patent No. 315,015 dated April 7, 1885
Application filed February 27, 1885 (No Model.)
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To all whom it may concern:

Be it known that I, WILLIAM DUNN, of the city, county and State of New York, have invented certain new and useful Improvements2 in Car-Couplers, of which the following is a full, clear and exact description, that will enable others skilled in the ar to which they appertain to make and use the same, reference being had to the accompanying drawings.3

This invention relates especially to that class of car-couplers in which the connecting-link is held by a swinging hook which lies in a socket in the draw-head and is pivoted to the draw-head by a pin that is made rigid with the hook, and is provided with a crank-arm, but which the hook can be lifted to release the connecting-link. With this construction much wear of course comes upon the crank-pin which holds and through which the swinging hook is operated and it is therefore desirable to make such pins so that they, as well as the nooks, when worn out or broken, may be readily removed and substituted by others; and to this end, also it is requisite that the hook and pin be so constructed that they may be put in place and secured without the necessary use of handtools; and furthermore, they should be of the simplest possible form, so as to be cheaply made.

My invention consists of a hook for engaging the connecting-link, which hook is provided with an angular hole at its pivot end, and lies in a suitable mortise or socket in the draw-head; and it also consists of a crank-pin for holding such hook in place, this crank-pin being flat sided where it passes through hook to correspond with the angular opening in the hook and to be rigid therewith, while its bearings in the draw-head are circular, in one next the crank-arm being larger than the angular part of the pin, and the one at the other end of the pin being smaller than such angular part.

In the drawings, Figure 1 is a central vertical section of a car-coupler embodying my improvements. Fig. 2 is a side view of the same, and Fig. 3 is a vertical cross-section through the crank-pin bearings. (...)

What is claimed as new is--

1. The combination, in a car-coupler, of a hook for engaging the connecting-link, and a pivot for fastening said hook to the draw-head, which consists of a crank-pin that is flat sided in the middle to fit into an angular hole in the hook and has circular-bearings in the draw-head, one of which is larger and one smaller than the said flat-sided part, as and for the purpose set forth.

2. In combination, the draw-head A, the hook B, having hole D, and the crank-pin E F, having the circular bearing of G H and the flat sided part I for the purposes described.


William Dunn

Witnesses:
Jos. E. Dunham
W.H. Smith


1 For classification purposes this document has been given the date of April 7, 1885, the date the of the official letters patent.


2 Some words in the document have been capitalized for reasons that do not always accord with modern rules of English grammar.


3 Three diagrams showing the various parts of the coupler were included with the patent. Dunn had been working on this patent for several months, but in the meantime, Isaac McQuesten and his brother Calvin Brooks were growing impatient while waiting for Dunn to repay Isaac for money invested in Dunn's efforts to sell his other patents. Dunn had agreed to repay Isaac $600 or turn over his patents and models as repayment. For more on this patent, see W1707, W1711, W1712, W2656, W2667, W1532, W2671, W2675, W1714, W1716, W1721. For more on Dunn, see W2554a.




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