US1281375A - Engine valve-gear. - Google Patents

Description

J. D. HOOD.

ENGINE VALVE GEAR.

APPLICATION FILED 05020, 1911.

Patented Oct. 15, 1918..

2 bHEETSSHEET D l. D. HOOD.

ENGINE VALVE GEAR.

APPLICATXON FILED 050.20, 1917.

Patented 00t.15,1918. 2 SHEETS-'SHEET 2 iii ens A Winn JOHN D. HOOD, OF PHILADELPHIA, PENNSYLVANIA.

ENGINE VALVE-GEAR.

To all whom it may concern:

Be it known that 1, JOHN D. H001), a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Engine Valve-Gears; 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.

My invention has for its principal object to simplify and thus decrease the labor and expense of constructing and installing valve gear mechanisms for locomotives; and with this general object in view, the invention resides in the novel features of construction and unique combinations of parts to be hereinafter fully described and claimed, the descriptive matter being supplemented by the accompanying drawings which form a part of this specification and in which:

Figure l is a side elevation partly in section showing my invention applied;

Fig. 2 is a top plan view;

Fig. 3 is a perspective view of the im proved link mechanism; and

Fig. f is a disassembled perspective view of several features of the invention.

In the drawings above briefly described, the numeral 1 designates one of the cylinders of a locomotive, 2 the piston of said cylinder, 3 the piston rod of the piston 2, and 4: the cross head to which the rod 3 is connected. The common steam chest 5 communicates with the cylinder in the usual manner and a slide valve 6 is located in said chest and is provided with an operating rod 7 preferably formed of two sections pivoted together at 8. A. driving rod or pitman 9 is pivoted at 10 to the cross head 4 and at 11 to one of the drivers 12, and power may be taken from this driver to the others by means of the usual connecting rods 13. The parts so far described are of common construction and need no detailed explanation.

A transverse rock shaft 14.- is mounted in suitable bearings on the frame of the locomotive and is provided on one end with a pair of crank arms 15 to which the front ends of a pair of floating members in the form of longitudinal links 16 are pivoted at 17. Fulcrumed at 18 to the rear ends of the links 16, is a substantially vertical lever 19, the fulcrum being located at the upper end of this lever as shown. A suitable distance be- Specification of Letters Patent.

Patented Oct. 15, 1918.

Application filed December 20, 1917. Serial No. 208,105.

low the fulcrum 18, the rear end of the valve rod 7 is pivoted to lever 19 as shown at 20. The lower end of lever 19 is pivoted at 21 to a lever 22 which is fulcrumed between its ends at 23 to the cross head 4, the pivotal connection 21 being located at the front end of said lever 22, while the rear end of said lever is pivoted at 24: to a slide 25 mounted on the pitman 9.

By the arrangement of parts above described, the lever 22 will shift lever 19 upwardly and downwardly and at the same time will oscillate this lever, so that the valve 6 will be operated in the required manner without the provision of the usual complicated structures employed for this purpose. The links 16 permit the necessary movement of lever 19 and whenever rock shaft 14: is suitably shifted, the operation of parts is so changed as to either cause idling of the valve or reverse motion thereof, so that the locomotive may either be brought to a stop or reversed. The invention is extremely simple and therefore inexpensive to manufacture, install and repair, yet it is equally as eflicient as the complicated arrangements of parts previously employed.

Any preferred means may be utilized for rocking shaft 14, but this shaft will in most cases be provided with the usual crank arm 26 to which the longitudinal reverse rod 27 is pivoted, said rod leading rearwardly to the reverse lever in the engine cab; and due to the simplicity and ease of operation of the present invention, this lever may be of much smaller size than usual.

From the foregoing, taken in connection with the accompanying drawings, the several novel features of my invention and their advantages will be readily understood. I wish to state, however, that although the several details shown are preferably em ployed, numerous minor changes may well be made within the scope of the invention as claimed.

I claim:

1. In an engine valve gear, the combination of a cylinder and a piston therein, a cross head operated by said piston and a driving rod pivoted to said cross head, a valve for said cylinder having an operating rod, a lever to which said operating rod is pivoted, a floating member to which said lever is fulcrumed, a second lever fulcrumed on said cross head and pivoted to said first named lever, and a sliding connection between said second lever and said driving rod for operating the former from the latter.

2. In an engine valve gear, the combina-' tion of a cylinder and a piston therein, a

\ cross head operated by said piston and a.

driving rod pivoted to said cross head, a valve for said cylinder having an operating rod, a substantially vertical lever to which said operating rod is pivoted near the upper end of said lever, a swinging link to one end of which the upper end of said lever is fulcrumed, a vertically movable support to which the other end of said link is pivoted and means for raising and lowering said support at the-will of the, operator, a substantially horizontal lever fulcrumed between its ends to said cross; head, a pivotal connection between one end of said horizontal lever and the lower end of said vertical lever, and a sliding connection between the other end of said horizontal lever and said driving rod for operating the former from the latter.

3. In an engine valve gear, the combination of a cylinder and a piston therein, a cross head operated by said piston and a driving rod pivoted to said cross head, a valve for said cylinder and an operating rod for said valve, a rock shaft mounted transversely of said operating rod and having a pair of lateral arms straddling said rod, means for rocking said shaft to raise and lower said arms, a pair of vertically swinging links pivoted to said arms, a vertical lever fulcrumed at its upper end to said links, means connecting said valve operating rod to said vertical lever below the fulcrum of the latter, a horizontallever fulcrumed between its ends to said cross head, means pivotally connecting the front end of said horizontal lever to the lower end of said vertical lever, a sliding member mounted on said driving rod, and a pivotal connection between said sliding member and the, rear end of said horizontal lever.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

JOHN D. .HOOD. Witnesses:

E. A. KELLEY, H. T. RICHARDS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. G. i

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