US104224A - Improvement in valve-o-ear of steam-engotes - Google Patents

Description

DA vin c. STA RKEv,-

or Naw voxan, N. v.

Letters Patent No. 104,224, dated .lune 14, 14870.

IMPROVEMENT IN VALVE-GEAR OE' STEAM-EN GINES.

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

To all whom it may concern:

Be it known that I, DAVID STARKEY, of the city and State of New York, have invented an Improvement in Steam-Engines', and the following is portion where the Imovement should be-thc most `rapid.

Instead of employing an eccentric or a cam I make .use of a link actuated by the lateral movement ot' the pitman or connecting-rod.

rlhis lateral motion is the most rapid as thc crank passes the dead centers; hence, the valve is moved with rapidity in opening. and closing the ports, and remains almost stationary while the. piston is moving in the middle portions ot' tbc stroke.

I non'nt the piston upon a rod that passes through both heads, so as to form guides, and the cross-head is behind the cylinder, and from this the connecting- `rods pass at the sides of the steam-cylinder to a second cross-head and connection to thecrank.

. In the drawingy Figure 1 is a plan otiny improved engine, and

Figure 2 is an elevation with the valve in section.

le is the steam-cylinder.

l), the piston-rod, connected to the cross-head c, and from the ends ot' said cross-head the two pitmen or connecting-rods fl d pass along at the sides o f the cylinder a to the cross-head e,'frou1 which the rod f connects to the crank g of the main shaft It. Y

The piston-rod b passes entirely through the cylinder c, so as to form a guide and dispense with the slides usually Yprovided for the cross-head.

By using the second cross-head c and rod f, but one crank is required.

Above the cylinder c is the steam-chest lr, containing the cylindrical valve i, in which are steam-ways 2 2, and exhaust-way 3, and in the chest are the ports 4 4, to the steam-cylinder and the exhaust-port 5.

The valve Ii is upon the stem l that passes through a stuffing-box, and has at the end an arm, m, from which the link n passes to the pitman or connectingrod d. s

'lhe parts are united by joints, so as to allow of la free motion, and the connection between the arm m and link n| should be adjustable, so that the proper position and movement may be obtained.

It will now be understood that when the crank g is near the quarter point, and the piston of the engine in the middle portion of its stroke, there .is but little movement given to" th'e valve, because there is but little lateral motion to the rods d, but, asrthe crank turns the center, the connecting-rods rcceivea rapid lateral motion, which motion is transmittedy by the link aand arm m to the valve i to' open one exhaust and the opposite steam-port with rapidity.

This construction of mechanism is very simple, and f the rapid motion is given to the -valve at the proper portion of the stroke, and 'but little motion during 'that part of the stroke where the steam and exhaust- I ports require to be fully open.

In consequence ofthe arrangement of the connecting-rods, cross-heads and pistou-rods, the engine is very compact, and there is no undue strain or wear upon any of the parts.

I do not claim a three-way cock or plug forming the valve fora steam-engine.

What I claim as my invention is- 1. A connection between the pit-man or connectinglrod and the valve, substantially as s et florth,I so that the lateral movement of the -said connecting-rod iinparts a movement to the valve, as specified.

2.'The cylindrical valve i, containing the steam and exhaust-ways, in combination with the arm in, link n, 'and pitman, arranged and acting substantially as set forth. v

3'. The arrangement of the connecting-rods d df,

Witnesses z 'HAROLD SEnnnLL, GEO. T. PINGKNEY.

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