US135796A - Improvement in valve-gears for engines - Google Patents

Description

n. Msc. FRYER.y

Valve-Gears for Engines. Y

VNo.2,f135,796. y Patemedfeb-ln,1,8,73.

AMnioro-umocmvmc co. Mwomamvz mams) the pistons NunnS'IA'IES PATENT- QFFIGE.

HIS RIGIEI'IA T0 GEORGE W. SAULPAW.

IMPROVEMENT IN VALVE-GEARS FOR ENGINES.

Specicatinu thrilling part of L: tters Patent No. 135,796, dated February 1l, 1873.

To all 'whom it may concern:

Be it known that I, ROBERT MGC. FRYER, of Nashville, in the county of Davidson and State of Tennessee, have invented a new and useful Improvement in ValveLGear for Engines; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanyin g drawing forming part of this specitication, and in which* Figure 1 represents a rear elevation of a double cylinder engine with my improved valve-gear applied, and Fig. 2 a partly sectional side elevation of the same.

Similar letters of reference indicate corresponding parts in both iigures.

This invention relates to steam and other engines, constructed substantially as described i in Letters Patent No. 124,805, issued to me March 19, 1872, and in which a rocking beam or device having no Xed center, and constituting a cross or its equivalent, was used for converting reciprocating motion into rotary motion, said cross having its one end or arm connected with the crank to which it is required to give rotary motion, its opposite end or arm with a reciprocating cross head or slide, and its two remaining arms with the reciprocating pistons, respectively, of a double-cylinder engine, whereby a variable motion was produced which avoided dead-centers as regards the action of the crank. My invention consists in a certain gear for operating'the valves which control the admission and escape of the steam or other propelling medium to and from the pistons of such engines, said gear comprising a similar rocking-beam or cross"connection having its one arm pivoted to across head or slide, its opposite arm worked by an eccentric on the engine-shaft, and its remaining arms connected, respectively, with the valve-rods of the two cylinders, whereby the valves are operated in exact unison with the engine-pistons to obtain a proper action for the latter when connected with the main or crank shaft, as described. A

l In the accompanying drawing, AA' are the cylinders of .a double-cylinder steam-engine,

of which are connected, respectively, by their rods a a' and links b b', with the opposite ends or arms c c' of a rocking beam or cross, B, havin no fixed center. The two other remaining arms d d' of the cross are connected, respectively, as hereinbefore re ferred to, with a cross head or slide, C, and with a crank, D, ofthe main or engine shaft E.

In an engine-connection of this description, when force is applied separately to either of the pistons, the arm c or c' of the cross B in connection therewith has a tendency to revolve the whole cross 5 but as this is prevented by the slide C, which acts as a fulcrum, the opposite arm c or c' is forced to the right or to the left, as the case may be, and at the same time is forced in au opposite direction to the force applied to the piston. When equal force is applied in the same direction to both pistons the whole cross B acts as an ordinary connecting-rod, in combinationy with a crank and reciprocating motion, and has no direct vibratory force. The crankl D being arranged as represented in relation with the cross and pistons or their rods, steam is admitted at different intervals to the pistons to rotate the en gine-shaft, being first admitted to act upon a single piston, and then upon both pistons, and toward the conclusion of the stroke upon a single piston again, the two pistons moving at different velocities relatively with each other during certain portions of the stroke, all as described in my Letters Patent hereinbefore referred to.

In such an engine-connection., however the admission and exhaustion ofthe steam to and from the enginecylinders may be adjusted,

it is important that theact-ion of the valves which controlthe engine-pistons should be in accordance with the motion as derived from the cross B. To this end I employ a valve gear similar to the engine-beam or crosscounection, but deriving its motion from the rotary movement of the main shaft E by means of an eccentric, D', and whereby rotary motion is converted into reciprocating motion to operate the valves of the two cylinders. G- Gr' are the valve-boxes of lthe cylinders A A', and c e' the valve-rods, connected by links f f with the two opposite ends or arms h h', respectively, of a second rocking and reciprocating beam or cross, B', having no fixed center, and the two remaining arms i t" of said cross being connected, respectively, with a slide, Q', 4and with the eccentricl D on the elif E of-etheengine-audits operating-cross YB or gine-shaftjEL By means `of this valvegear, its equivalentLofthesecondary cross B or its the valves are operated in timely relation with equivalent, the eccentric D', the slide C', and the engine-pistons, as controlled by the cross the valve-rods e e', the whole being arranged 13 of the en gine. in relation with each other for operation sub- Under this arrangement a single eccentric, s tantially as specified. .DQ ser-ves to operate 4two separate valves- ROBERT MCC. FRYER.

that is, one for either cylinder. Y

What is here claimed, and desired to be se- Vitnesses: l cured by Letters Patent, is- FRED. HAYNEs,

The combination, with the revolving'shaft BENJ. P. SHARP.

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