US181315A - Improvement in steam-engines - Google Patents

Description

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STEAM-ENGINE. K

No.181,315. Patented Aug. v22, 1876.

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UNITED STATES PATENTr'r'rcEo AYLET'I R. CRIHFIELD, OF LINCOLN, ILLINOIS.

IMPROVEMENT IN STEAM-ENGINES.

Specification forming part of Letters Patent No. 181,315, dated August 22, 1876, application filed December 23, 1875. l

To all whomt't may concern:

Beit known that I, AYLETT R. GRIHFIELD, of the city of Lincoln, county of Logan, and State of Illinois, `having invented certain Improvements in Steam'- Engines, `or engines to be operated by any elastic uid under pressure, hereby declare the annexed specification to be a correct description of the same.

The object sought is to obtain the eective use or service of two cranks on one shaft by the use of one cylinder, thereby obviating the dead-centers.

In the annexed drawings, which are a part ot' this specification, I use like letters of ref-y erence for the 4same parts, as exhibited in the various figures or drawings.

Z, Figure l, is a cylinder, cut away in order to show its internal parts. M is a head or partition, set inside of said cylinder to divide it into two parts. It is tightly packed, and made secure and solid.. On each side ot' said stationary head or partition M I place a pistonhead, K K", and attached to each one is a piston-rod, D and P, respectively. The piston-rod P is hollow,'and terminates at the crosshead H, att-ached to which is a stuffing-box, G, said cross-head being supported by the sliding bars S S. The piston-rod D, attached to the piston-head K, passes through a stuii'- ing-box in thev center of the head M, and passes into and through the hollow piston-rod P, the stufling-boX B, and terminates at, and is attached to, the cross-head N. rIhe crosshead H carries a connection-rod, I, which Ais connected with a crank, C. The cross-head N carries a connection-rod,j, which is aixed to a crank, L, said cranks C and L being on one shaft, and set at right angles with each other.

0n each side of the interior head or partition M portways are made to admit power,

said portways being indicated by the letters o o w w into the cylinder to press upon the piston-heads K K".` VThe valve v is operated by the eccentric E working the -valve-rod'q. Fig. 2 shows the under side ofthe valve c. y y are slots cut through the valve, and when lying in its place, as shown in Fig. 1,-said slots move upon and over the portways o o, alternately opening and closing said ports.

The hollow parts of the valve (marked b b) connect with the slots y y, and while the valve is in motion the hollow parts b b will traverse over the portways o o, permitting steam or other elastic pressure to pass into the cylinder, arid move the piston-head K and .rod D to the end of the stroke ofthe crank L, when the supplementary valve t, Fig. 3, is, by means of the lugs i t' t' working against the xed points r 1', made to cover the slots'y y, in such manner that the hollow part thereof (marked t, Fig. l5) covers the portways, and permits the exhaust to pass -up through the slot h, Fig. 2, and through the exhaust-opening at X, Fig. 1. The exhaust-Ways for the ports o o and fw fw come together at X, Fig. l. The portways w w are operated by that part of the valve c marked t, and which is the ordinary slide-valve.

What I Vclaim as my invention, and desire to secure by Letters Patent, is-

The combination of the cylinder Z, the fixed head M, the piston-heads `K K", the hollow piston-rod P, 'and the piston-rod D the valve "v and the supplementary valve t, operating together, for the uses and purposes described.

AYLEIT It. CRIHFIELD. Witnesses:

JOHN C. FICKEE, STEPHEN LLOYD.

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