Valve Gears an outline


| September/October 1962



3531 Tea Street N. W., Washington 7, D. C.

Mr. Frank L. McGuffin, 3531 Tea St., N.W., Washington 7, D.C. is good enough to agree to help us get out a book on Valve gears . It will cover some 30 valve gears as used on traction engines or were designed for the same. We give below an outline of the work by Mr. McGuffin for your criticism and you may be able to make some contributions. He is very anxious to get more material on the 'Springer' and 'Butterworth' valve gears. We shall be glad to hear from you - good or bad. - - Elmer.

LUGMAYR CLASS :

On January 24, 1882, Louis C. Lugmayr was granted a patent No. 252,683 which was to lead the parade of valve gear patents using the sliding block.

I do not know whether or not Mr. Lugmayr sold his patent to Mr. Grime, but on November 17, 1885, John Grime was granted patent No. 330,782 and the drawings were very much alike, the main difference being that Mr. Grime used the inside sliding block instead of the outside block of Mr. Lugmayr.

On September 11, 1888 a patent No. 389,382 was granted to Mr. Grime; showing his improvements and it was this improved gear that was used on the P at Huron and other engines.

Not to be outdone on a good thing, Ellis J. Woolf and John Peebles added the 'Dowager's Hump' on the eccentric strap and were granted a patent No. 407,806 on July 30, 1889. And this was the famous Woolf gear used on the Case engines.