US331003A

US331003A - Geoege t

Info

Publication number: US331003A
Authority: US
Publication date: 1885-11-24
Anticipated expiration: 1902-11-24

Description

-(No Model.) I 2 Sheets-Sheet 1.

G. T. PILLINGS.

VALVE GEAR. No. 331,003. Patented Nov. 24, 1885.

2 Sheets-Sheet 2! G. T. FILLING-S.

VALVE-GEAR.

Patented Nov. 24, 1885.

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NITED STATES PATENT Enron.

VALVE-GEAR.

SPECIFICATION forming part of LettersPatent No. 331,003, dated November 24, 1885.

Application filed July 24, 1885. Serial No. 172,539. (No model.)

To all whom it may concern:

Be it known that I, GEORGE T. PILLINGs, of the city of Baltimore and State of Maryland, have invented certain Improvements in Valve- Gear for Steam-Engines, of which the following is a specification.

This invention relates to certaim improvements in Letters Patent No. 273,567, granted to me on the 6th day of March, 1883, for valvegear for engines, to which reference should be had.

In the description of thesaid invention which follows reference is made to the accompanying drawings, forming a part hereof, and in which-- Figure I is an exterior side view of certain portions of a horizontal reciprocating engine embodying my improvements. Figs. II and III are enlarged views of the valve-gearing.

A is the steam-cylinder, secured to a frame, B, carrying the shaft-bearing box 0.

D is the main shaft, and E the crank-wheel keyed thereon.

The cylinder is of the four-ported description, and the steam and exhaust ports are each provided with an independent valve.

In Fig. I the steam-valve chests are shown without covers, so as to disclose the steamports, which are denoted by a and b.

Fis an eccentric keyed to the main shaft D, and c is the eccentric-strap. This eccentricstrap is connected to a rocker, d, by means of a rod, 6, which in turn is attached, through the medium of the rod f, to the adjustable block 9 of the link G. The link G is pivoted at its lower end to the engine-frame. The hub h of the link G has a plate, i, and this plate is attached to arms H and I by means of rods j and k. The steam-valve stems J and K are attached to the arms H and I by means of pins Z and m. (See particularly Figs. II and III.)

By referring to Fig. I it will be seen that the eccentric-rod f at a point near to the block gis connected by a rod, n, to a vertically-moving part of the engine-governor, the height of which depends on the rapidity of motion of the governor-balls.

The governor proper is of ordinary construction, and requires no description herein.

The mechanism for actuating the exhaustvalves is not shown in the drawings.

The various parts of the valve-gear are represented in the drawings in such relative positions as they would occupy when the engine is doing ordinary duty. If an increased load is put on the engine, a slight reduction in speed of the shaft takes place, and the verticallymoving part of the governor, in view of the reduced centrifugal force of the balls, is consequently depressed. The sliding block 9 is thus lowered in the link G, and as its motion is at all times uniform its application to a point nearer to the pivotal point or fulcrum of the link G causes the valve-stems to receive an increased movement. An increased stroke of the steam-valves causes the steam to follow the piston further in its stroke, and its speed is consequently increased, which increase continues until checked by the distention of the governor-balls.

Referring particularly to Fig. II, it will be seen that the arrangement of the various parts of the valve-gear therein shown is such as would exist with both steam-ports covered with their valves. Supposing the block G to be now moved in the direction indicated by the arrow in full lines, very little movement would at first be imparted to the valve-stem J in view of the angular position of the rod j; but as. this rod is straightened the motion of the valvestem is increased, which increase continues until the rod is straightened and the maximum speed attained. At this time the operation as regards the valve-stem K is reversed. In the return of the eccentricrod, or its movement as indicated by the arrow in dotted lines, the motion of the stem J is atfirst rapid; but as the rod falls below astraight line the rapidity of movement of the stem decreases until it stops with the steam-valve over its port.

From the foregoing description it will be understood that with my invention steam is admitted to the steam-ports very slowly'at the beginning of the stroke, and the speed increases as the piston advances, which has the eflect of obviating the jar occasioned by a too rapid introduction of steam to the cylinder at the beginning of the stroke.

I claim as my invention stems, and pivoted links or rods to connect In a steam-engine, the steam eccentric-rod the said plate with the said pivoted arms, all eonnected to a sliding block within a pivoted combined substantially as specified.

vibratory link and ,to some adjustable portion GEORGE T. PILLINGS. 5 of the governor, a plate adapted to have a Witnesses: movement in common with the said link, a DANL. FISHER,

pair of vibratory arms connected to the valve- CHAS. WV. ARNOLD.