US86974A - Improvement in steam-engines - Google Patents

Description

@ya W CI li btitcil ltater JAMES M. DAVIDSON, OF NAPOLEON, ARKANSAS.

Letters Patent No. 86,974, dated February 16, 1869.

IMPROVEMENT IN STEAM-BN GINES.

The Schedule referred to in these Letters Patent and making part of the same.

leon, in the count-y ot' Desha, and Stute. ot' litrkansas.

have invented a nowand usetul Improrenmnt in Steamllngines; and l do hereby declare that. the tbllowing is" a. full, clear, and exact description thereof', which will enable those skilled in the art to lnake 'and use thc saine, retirence beingl had to the accompanying drawings, forming part ot' 'this #peeiticatioin This invention reiatcs to a new and useful improve- :nent in steam-engines, llowing-cylimhws, and all other machinery where cylinders and pistons ar'e used; and

[t eonsists in so construct-ing the pistou and pist-onrod, and conntwting'thc rod with the eyliinler-ln-ad, that a pitnian or eonnwting-rod and cross-hcad air dispensed with7 as will he herthaf'ter more fully dcscribed.

ln the accompanying plate of drawingshigure. l represents a vertical central section ot' a steam-cylinder, with lpistou and rod, with the'latter connected with the' pist-on and cyliluler-hezni, and packed according to my invention Figure .2 is a cross-section ot' fie. 1, through the line Similar letters ot' reference indicate corresponding parts.

A. is tbc cylinder is the piston.

C is the piston-red. K I-n dispensing with the pituian-rod and cross-head,

which usually connect the pistou-rod with the work-V ing-beam ofthe engine, it is necessary to so construct the parts that the piston-rod-wiil, in its up-and-down motion. contorni to the are ot-'fthe circle which is described by the end of the working-beam.

[u iny invention, i accomplish this in thc 'following lt is coutined to the cylinder-heini by two trunnions il.

The piston-rod is pack-'ed in this oscillating box by ball-packiuer rings, 'onlined in aglobular cavity, formed in the top ot' the box and the lower side ofthe cap I, as seen in the drawing.

lhese rings are so termedl that, by screwing the. paris l ogetber, as represented, the inner ring J (which is ent like thc ordinary packing-ring, so that it may be compressed) may be adjusted Vto the rod so as to form va steam-tight joint, as it will be seen that the rings are. made taperiner t'or that purpose.

["igurc 5l is a section oi' a wtuiting-beam, wit-b its t'ulcruin shown in red color.

it will be `seen that when in operation, the ond of the working-limon, vibrating on its` trunnions 'or fu1 crlnn, will dcs '-riln\the are ot' a circle, as indicated in thc drawing, and that, by this method ot connecting the piston-rial with the cylinder, theengine will work withoutacross-hond, Aor a connecting-rod, (or pitIna-n,) 'and the pistou-rod will vibrate without strain or bilidng in any part, and with less' friction than the ordinary engine, as the nearing-surthee is greatly reduced as compared with the eonunon engine.

The oscillating box ll, extending upward, asitdoes, from the evliiider-heaul, act-s as a guide for the pistonrod, while the tibi-ation ot' the rod renders@ connecting-rod unnecessary. 1 n i 'lllre wearing-surface, and consequently the friction, are great-ly reduced, while the application ofthe power is more direct, andthe working-parts are brought intol lating box E, cylinder-head G, t-runnions H, piston B,

and pistou-rod C l), substantially as. herein set forth. 2. The construction ot' the ball-packing, with its cap, I, in the oscillating box E, con1bined with the piston-rod C, substantially as described.

' JAMES M. DAVIDSON.

NVitnesse:

J As. MURPHY, D. O. LOVELL,

W. E. ONEAL.

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