US794794A - Valve-controlling mechanism for gas-engines. - Google Patents

Description

PATENTED JULY 18,v 1905.

. G. H. ELLIS.

VALVE GONTROLLINGMEGHANISM POR GAS ENGINES.

APPLICATION FILED FEB. 18,1905.

UNITED STATES Patented July 18, 1905,

PATENT OEEiCE.

HARVESTER COMPANY, A CORPORATION OF NEV JERSEY.

VALVE-CONTROLLING NIECHANISNI FOR GAS-ENGINES.

SPECIFICATION forming part of Letters Patent NO.. 794,794, dated July 18, 1905.

' Appiiaaon filed February 18,1905. serai no. 246,211.

To all whom, t muy concern.'

Be it known that I, GEORGE H. ELLIs, aciti- `zen ofthe United States, residing at Chicago,

`valve opened by suitable connections with a moving part of the engine. These parts may be any of the preferred forms.

The object of my invention is to provide improved means for holding the inletvalve closed during the time in which the exhaustvalve is open, it being well knownto those skilled in the art that owing to the sudden exhaustion of the exploded charge from the cylinder and consequent partial vacuum therein the inlet-valve will be moved from its seat, resulting in a waste of explosive mixture. If the inlet-valve be held to its seat by springpressure, it is necessary to have the force of the spring accurately adjusted proportionately with the amount of vacuum, sothat it will open to admit a charge of the explosive mixture at the proper time. Mechanism has been employed to increase the pressure of the valve-spring above normal during the time the exhaust-valve remains open; but such means has been found objectionable in thatit soon seriously impairs the effectiveness of the spring. In providing a mechanism designed to remove the evil mentioned I employ a supplemental spring arranged to operate upon a lever pivoted to the valve-operating rod and engaging the stem of the inlet-valve in a manner to cause the supplemental spring to exert its force auxiliary with the regular valvespring to hold the valve closed while the exhaust-valve remains open and to be wholl y -inactive as soon as said exhaust-valve is closed.

Reference is made to the drawings forming a part of this specliication, 1n which- Figure l represents a partial sectional plan view of so much of a valve mechanism of the class described as will be suflicient to illustrate my invention, and Figs. 2. and 3 areenlarged views of details of the same.

The same reference-numerals indicate like parts. 1

I represents the engine-c vlin der; the head secured thereto; 6, the inlet-valve provided with the stem 6, washer 7, coiled spring 8, surrounding the stem 6 and operative be- 60 tween the washer 7. and the cylinder-head, and the adjusting-nut 9. Surrounding the valve-stem and spring is a hollow standard 10, secured to the cylinder, and at the outer end of which is pivoted a rocker-arm Il, one end of which is provided with an adjustable bolt v12, adapted to contact with the outer end ofthe stem 13 of the exhaust-valve 14, seated inthe cylinder-head. The valve-stem 12 is supported-by and slides through a hollow standard 15, securedto the cylinder-head, and is surrounded by a coilspring 16, operative against the washer 17 to hold the exhaustvalve upon its seat, and an adjusting-nut 18 is provided for adjusting the stress of the spring. 19 is avalve-rod pivotally connected with the opposite end of the rocker-arm 1l and adapted to be reciprocated by a movable part of the engine in any of the well-known ways.

2O is an arm pivotally connected at one end to the valve-rod 19 and provided at its opposite end with a fork that rests against the inner surface of the washer 7 at the end of the stem of the inlet-valve 6, the space between the members of the fork being greater than the outside diameter of the coiled spring 8, so as to not contact therewith, as shown by dotted lines in Fig. 2. The arm 2O is provided with a heel portion 21, adapted to contact with the valve-rod 19 and limit the outward swing of the same when the valve-rod is moved in,one direction, and a coil-spring 22, having one end secured to the arm and its opposite end to an earpiece 23 on the valve- 95 rod, is adapted to operate to swing the arm ouwardand the heel portion toward the valvero The valve-rod is moved in one direction by a moving part of the engine to open the exhaust-valve and in the opposite direction by a spring or otherwise, and the operation of my invention is as follows: When the valverod is moved to open the exhaust-valve, the arm 20, being in Contact with the washer 7, will press against the washer with a force governed by the tension of the spring 24, and this force auxiliary to the force of the valvespring 8 assists in holding the inlet-valve closed independent o't' the regular valve-spring, which may be adjusted as circumstances require, and its action is in no wise affected by the action of the arm and auxiliary spring.

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

l. In a gas-engine, the combination of a cylinder, spring-controlled inlet and exhaust valves communicating therewith, a rocl-le Ver suitably mounted on a ixed part of the engine having one end adapted to contact with the exhaust-valve to open it when moved in one direction, a rod deriving reciprocatory movement from a moving part ot' the engine and pivotally connected with the opposite end of said rock-lever, a lever-arm pivotally mounted at one end on said rod and having its opposite end adapted to engage with the stem of the inlet-valve, said lever-arm being limited in its pivotal movement in one direction and a spring operating to yieldingly hold it in said direction.

2. In a gas-engine, the combination of a cylinder, spring-controlled inlet and exhaust valves communicating therewith, a rock-lever suitably mounted on a lixed part of the engine having one end adapted to contact with the exhaust-valve and open it when moved in one direction, a rod deriving reciprocatory movement from a moving part of the engine and pivotally connected with the opposite end of said rock-lever, a lever-arm pivotally con nected at one end with said rod and having its opposite end engaging with the stem of the inlet-valve when moved in one direction and a spring secured to said rod and operative to yieldingly hold the said lever-arm in said direction.

3. In a gas-engine, the combination ot' a cylinder, spring-controlled inlet and exhaust valves communicating therewith, a rock-lever suitably mounted on a fixed part of the engine having one end adapted to contact with the exhaust-valve and open it when moved in one direction, a rod deriving reciprocatory movement irom'a moving part of the engine and pivotally connected with the opposite end of said rock-lever, a lever-arm pivotally mounted at one end on said rod and having its opposite end engaging with the stem of the inlet-valve when moved in one direction, a spring .secured to said rod and operative to yieldingly hold the said lever-arm in said direction and a heel on the lever-arm adapted to contact with the rod and limit the swingof the lever-arm about its pivot.

In witness whereof I hereto affix my signature in presence oi two witnesses.

GEORGE H. ELLIS.

I/Vitnesses:

MARGARET A. SWEENEY, J. O. WARNES.

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