US763502A - Valve-gear. - Google Patents

Description

No. 763,502. PATENTBD JUNE 28, 1904. l

v S. L. MGCAIN-` VALVE GEAR. APPLIGATIONTILED JAN. 4, 1904.

No MODEL. s

-u s Z/ v4,

will l n Inventor Attorney .Witnesses @Q/W' B Maw Y l l Y v Patented June 28, 1904.

PATENT OFFICE.

SIDNEY LEA` MCCAIN, OF HUTCHINS, TEXAS.

VALVE- SPECIFICATIONl forming part of riet-'nefs4 Patent No. 763,502, dated June 28, 1904.

Application ned January 4, 1904.

T0 all w/wm t mafyconccrn:

Be it known that I, SIDNEY LEA MCCAIN, a citizen of the United States, residing at Hutchins, in the county of Dallas and State of Texas, have invented certain new and useful Improvements in Valve-Gear; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. Y

This invention relates to improvements in valve-gears for steam-engines.

The object of the invention is to provide a valve-gear for engines which will be simple, strong and durable in construction, eliicient in action, and inexpensive of production.-

VVith this and other objects in'view the inventioniconsists of certain novel features of construction,` combination, and arrangement of parts, as will be more fully described, and particularlyT pointed out in the appended claim.

In the accompanying drawings, Figure 1 is a side elevation of an engine constructed in accordance with the invention. Fig. 2 is a vertical longitudinal sectional view taken through the piston-chamber and steam-chest. Fig. 3 is a vertical transverse sectional view through the cylinder-casing on a line with one of the valve-chambers. Fig. 4 is a similar view taken on a line with the inlet and exhaust pipes. Figs. 5 and 6 are detail views of opposite sides of the plug-valves.

Referring more particularly to the drawings, 1 denotes the cylinder-casing. 2 denotes the steam chamber or chest arranged in the upper part of said casing. `3 denotes the exhaust-chamber arranged in the rear portion of the casing, as shown.

4 denotes the steam-supply pipe which communicates with the steam-chamber 2, .and 5 denotes the exhaust-pipe which communicates with the exhaust-chamber.

Below the steam chamber or chest is arranged the piston chamber or cylinder 6, closed at its ends by heads 7. In the cylinder is mounted the piston 8, having the usual pistonrod 9, which works through a stuing-box 10 in the front head 7 of the cylinder in the usual manner.

Serial No. 187,699. (No model.)

In the casingl between the cylinder and the steam-chamber are horizontally-disposed transversely-arranged valve-chambers 12 and 13, which extend into the casing and communicat'e at their rear ends with the exhaustchamber 3. The valve-chambers 12 and 13 are arranged above each `end of the piston chamber or cylinder and are in communication therewith through ports 14. The valve-chambers are also in communication with the steamchamber 2 by portsl, which are immediately above or in line with the ports 14.

Within the valve-chambers 12 and 13 are ararranged rotary plug-valves 16, which are held in place in said chambers by cap-plates 17, on

which are formed stuffing-boxes 18, through which pass the stems 19 of said valves. In one side of each of the plug-valves is formed a segmental or semi-annular groove or channel 20, and on the opposite side of each valve is formed a longitudinally-disposed groove or channel 21 which extends to the ends of the same and communicates with the discharge-chamber 3 at the rear. W'hen the plug-valves are turned to a certain position,these grooves 21 will also communicate with the cylinder-ports 14,`thereby forming a passage'between the cylinder or piston-ch amber and the exh aust-chamber through which steam may be exhausted at the proper time. The valves are also adapted to be turned to bring the grooves 20 into such a position that the opposite ends ofthe same, communicate with the cylinder-ports 14 and the ports '15 in the steam chamber or chest 2, and thereby forming an inlet-passage to the cylinder or piston-chamber. On the stems 19 of the valves are secured crank-arms 22, to which are adjustably connected link-rods 23, the opposite ends of which are pivotally connected to the lower side of a wrist-plate 24, pivoted on the side' of the casing 1. To the upper side of the wrist-plate is pivotally connected a reach-rod 25, the opposite end of which is pivotally connected to the upper end of a pivoted rocker-arm 26, the lower-end of which is connected to an eccentric-rod 27, which extends from the usual eccentric disk 'on the crank-shaft. (Not shown.) vWhen the crankshaft is turned, motion will bc imparted through said eccentric-rod to the rocker-arm IOO and reach-rod and to the wrist-plate 24, which will oscillate the valves to cause the channels l or passages in the same to alternately afford communication between the exhaust and steam chambers and the piston-chamber at opposite ends of the same, as will be understood. The piston-rod 9 of the piston 8 extends through a stuing-box in the head of said cylinder in the usual manner. The end of the piston-rod is connected to a cross-head 30, which is slidably mounted in guideways 31, and to the end of said piston-rod or to said cross-head is connected a pitman-rod 32, the opposite end of which is connected to the crank-shaft (not shown) in the usual or any suitable manner.

From the foregoing' description, taken in connection with the accompanying drawings, the construction and operation of the invention will be readily understood without requiring a more extended explanation.

Various changes in the form, proportion, and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of this invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

In a valve-gear for engines, a cylinder-casing provided with a piston-chamber', a steamchamber in parallel relation therewith, an exhaust-chamber arranged in rear of and on a line between said piston and steam chambers, valvechambers extending longitudinally from the front of the casing transversely of and between the piston and steam chambers and communicating at their rear ends with said exhaust chamber, and ports connecting the valve-chambers with the steam-chamber and opposite ends ofthe piston-chamber, in combination with oscillating plug-valves arranged in said valve-chambers, each of' said valves having in one side asemi-annular groove to connect the piston-chamber with the steamchamber when the valve is in one position and in its opposite side a longitudinal groove to connect the piston-chamber with the exhaustchamber when said valve is in a different position, and'means for oscillating the valves to alternately govern the supply and exhaust of steam, substantially as described.

In testimony Whereot` I have hereunto set my hand in presence-of two subscribing witnesses.

SIDNEY LEA MCCAIN.

Witnesses:

' CLYDE MCCURDY,

C. R. REA.

Images