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US Patent: 144,731
Mechanisms for Reversing Engines
George W. Bishop - Brooklyn, NY

USPTO Classifications:

Tool Categories:
propulsion and energy : steam engines : steam engine valve gear


Not known to have been produced

A. Ascher
Jacob Fekbel
E. Wolff

Patent Dates:
Applied: Oct. 17, 1873
Granted: Nov. 18, 1873

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"Vintage Machinery" entry for New England Manufacturing Works & Co.
From a descendant of the inventor, Carol Bishop Fisher:

His last patent was for the Mechanisms for Reversing Engines (# 144,731 - Nov. 18, 1873) was possibly his least known, in his attempt to join the masses of inventors trying to solve the problem of the reverse mechanism for the steam engine. My ancestor's ingenious invention simplified the reversing mechanism by using rotary valve-blocks in place of the usual assortment of complex levers and link-motions which were then in use with less satisfactory results. Previous attempts to introduce sliding valves were unsuccessful because of the friction created by the steam pressure on the sliding block or plate, but this rotary valve eliminated this problem.

To this day it is the opinion of mechanical engineers that the steam engine reversing mechanism has never been perfected. G. W. Bishop became ill and escaped notice in mainstream technical literature of reversing gears. Had the George W. Bishop mechanism been tested, it may have proven to solve not only the problems of complexity and unreliability, but also the theoretical errors of port opening and timing introduced by lever and link-motion reversing mechanisms.

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