US69232A - Joseph mccon-nb-ll - Google Patents

Description

@geiten tetrs @anni @Hita JOSEPH MCC()NNFILL, F T01/VA CITY, IOWA. i Letters .Patent No. 69,232, dated September 24, 1867.

IMPRVEMENT IN VALVES FOR STEAM ENGINES.

4TG ALL WHOM 1T MAY CONOERN:

Be it known that I, JOSEPH MCCONNELL, of Iowa City, in the county of Johnson, and State of Iowa, have invented a new and useful Improvement in Steam Engines; and I do hereby declare that the following is a i'ull, clear, and exact description thereof, -which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawings, forming partei' this specification.

.This invention relates to a new and improved valve motion in the steam engine, the principal novelty of which consistsin opening and closing the ports of lthe engine cylinder by operating two cylinder valves at each i end of the engine cylinder, (one within the othcr) the inner valve being a cut-od` valve; and the invention con sists in the manner in which these-valves are arranged and operated, and in the device for rendering the inner valve a variable cut-oil, controlled by the speed of the 'engine through the governor, as will hereinafter bc described. I

Figure 1 represents a side view of the engine, showing the steam-chests at each end of the cylinder, and thc arrangement for operating the cnt-oil" valve. i

Figure 2 is a plan or top view of the same, showing the main shaf't, the eccentrics, and their rods, attached to the cranks of the oscillating valve stems. i

Figure 3 is a vertical section of iig. 2 through the line :r af.

Figure 4 is a vertical section of fig. -3 through the line y y.

Figure 5 is another vertical section of lig. Zthrough a' fr.

Similar letters of reference indicate corresponding parts.

A represents the engine cylinder, B the main shaft, C thc piston, and D the piston-rod; E is the pitman, which is connected with the cross-head D', and with the flywheel B ofthe main shaft; FF are the eecentrics on the maiushaft, and G Gr are the eccentric-rods.

There is no particular novelty in thc engine or the parts connected with it, so far as we have lettered the i same.l The main features of the improvement and invention, as before stated, consist in the construction,

arrangement, and operatiouof the valves, which we will now proceed to describe. r H H are the steam-chests, cylindrical in form, and situated at each end ofthe cylinder, and, as seen in the drawing, they are placed at right angles or transversely to the cylinder. Within cach of these steam-chests there is a cylinder oscillating valve, the stems of which are seen in tig. 2, mark-ed J J2 Each stem has a short crank, it, with wrist-s, and they are both operated by the eccentric F and rod G by being connected together by the rod c. These valves are open at their opposite ends and on their sides, as seen the drawing, figs. 3 and 5. These arethe main steam-valves, each having a slot aperture opposite the open part. They are marked n 1t. The slot apertures, as the valves are rolled or cscillatcd, admit steanr to the cylinder and exhaust it therefrom in a manner similar to the ordinary rolling valve. The steamis exhausted into an oriice which is cast in the cylinder, seen at o, iig. el, which orifice communicates with a chamber in the bed-plate oi the engine, as seen at m. The course of the exhaust steam is indicated by the arrow in tig. 3. The cutoli` valves are placed within the steam-valves n, where they arc oscillatcd, thc same as thc steam-valves are in the steam-chest. In the figs. 3 and 5 the ends of these cut-oil" valves-arc secu, marked p. They also have stems and cranks, which are seen in figs. l and Q. The stems are marked 7'; the cranks arc marked s. These valves are escillated by the eccen tric F and rod G', attached to a rock-shaft, T. This rock-shaft passes transversely over the engine cylinder, and has on its end a slotted arm, u, a side view ci' which is soon in iig. 1. et' are connecting links, which are l loosely attached to the cranks c by'screw-bolts, and which have wrist-pins :t on their inner ends, the collars of which are inside of the links l'. Between the pins the collars are flattened, so that they will enter the slots on the arms u, as seen in iig. 1. This slotted arm u, being attached to the rock-shaft T, which is operated by tlieleccentric F, operates the cut-ofir valves p p. The amount of steam which these valves cut oil" or let on depends upon the extent of their oscillating movement or throw, and the throw, of course, depends upon length of the f cranks s, and the position of wrist-pins :c in the slots of the arm u. The position of the pins x in the slots may hc controlled by the governor of the' engine, the rod of which may be connected with the pins a' by a suitable bridle, (seen-in red,) whereby the pins can be slipped up and down in the slots as the balls of the governor rise y or fall by the variations of the speed of the engine. It is thus made a self-adjusting variable cut-oit. The steam pipe fr m the boiler is connected with the pipe 71 at il. There are heads on the ends ofthe steam-chests,

through which the valve-rods pass, marked o. There may be smiling-boxes attached to these heads, by which the valve-stems may be packed steam-tight. The rock-shaft T is supported on standsf; :is seen in fig. 3. The slotted ami u is fastened to the rock-shaft by o. set-screw, or in any suitable manner.

Having thus described my invention, what I claim, end desire to 'secure by Letters Patent, is-

l. ,The combination :ind arrangement of the erm u, secured to the end of the rock-shaft T, between the cylinders H, and in the slots of which tlic'wrisbpins x work, connecting the erm u to the valves p, tlie'position of said pins x in the slots being controlled by means of Athe governor, whereby the throw of the valves p is regulated, :1s hcrci'n shown and described.

2. The valves j), constructed as described, formed in n. sernicrcle,wtli the pressure of steam applied upon one side, as and for the purpose specified.

3. The arrangement of the cylinders H,1nain valves und cuboff valves p, transverse shaft T, slotted arm u.,

- connecting-arms o, and cranks 8, as and for tbc purpose speeiiied,

JOSEPH MCCONNELL. Witnesses:

T. W. ROGERS, Puno HAYNns.

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