US1438437A - Starting attachment for two-cycle internal-combustion engines - Google Patents

Description

Patented Dec. 12, 192,2..

' S. B. GOLD. I v STARTING ATTACHMENT FOR: TWO-CYCLE INTERNAL COMBUSTION ENGINES.

' APPLICATLQN mso Dsc. 22. 1919. 1,488,437.

Patented @en l2, lQZZ.

SA'MUEL B.

mais? com), or rnnnrnnnnncn, Missionar, .assrenon To wuenn Errori-rn STARTING ATTACHMENT FOR TiKIO-UYCLE BNTEBNALCOMBUSTIN ENGINES.

Application tiled December 22, 1213.

To all w ,7mm t may concern Be it known that l, SAMUEL B. Genn, a citizen of the United States, residing at Independence, in the county ot Jackson and cSitate oi:l Missouri, have invented certain new and useful Improvements inStarting ittachments for Two-Cycle internal-Combustion Engines, of which the following is a specilication.

*This invention relates tov starting' attachments tor two cycle internal combustion engines. As well known two cycle engines, particularly those of the valveless type, very desirable because they can be operated with less attention and repair than engines equipped with valves. The chie-l objection to their use has been the ditliculty ofi startM ing them, and attempts have been made to produce engines ot this type having equipment to facilitate the starting by pumping a sufficient volume of combustible mixture into the cylinder and compressing such mixture. To accomplish this the attendant has been compelled to rock or oscillate the ily-wheel, the movement of the wheel in one direction sucking the combustible mixture into the pump chamber end oit the cylinder, and the reverse movement compressing the charge and ley-passing it to the opposite end of the cylinder. In practice, it hasA always been necessary to repeat these rocking or oscillating operations a number of times, because it was believed the piston must not be withdrawn a suilicient distance to uncover the exhaust port, and several et such limited piston movements were necessary to accumulate a sui'iicient volume of the mixture to eiect the starting of thel engine. ln the operations ot the fly-wheel the labor of the attendant grew more fatiguing because ot the increased resistance Otlered by the compression ot the mixture which increased in volume with each suction movement oi" the piston.

l have found that it ispossible to supply the cylinder of an engine of the type inentioned, with a starting charge by first turning the ly-wheel'enough to withdraw the piston for its tull stroke, then cutting oit the supply of mixture to the cylinder and then rocking the ily-wheel backward to compress the charge in the cylinder and trip the magneto to explode such charge, after which, operation occurs with the regular ports of sensi no. 546,541.'

the engine, and this without regard to whether the engine is of the valveless two or three port type.

My object, therefore, is to produce an in ternal combustion engine of the valveless two cycle type, provided with auxiliary air and gas ports at the head end of the cylinder sothat the engine can be started by one torward and one reverse turning movement, and in which this operation can be accomplished by a single attendant.

A Jfurther object is .to provide starting equipment of simple, durable and inexpensive construction,l which can be applied cheaply to engines already -in use or Jforms part otl the equipment 'of an engine when built.

To these ends the invention consists in certain novel and useful features .of construction and combinations oit parts, as hereinafter described and claimei; and in order that it may be fully understood, reference is to be had to the accompanying drawing, in which:

Figure l, is a view chiefly in side elevation, of an internal. combustion engine of the valveless two-cycle type, equipped with starting mechanism embodyingthe .invention. y

Figure 2, is an enlarged section on the dotted line ll, oit `Figure l.

4Figure 3, is a lvertical section on line lll-HI of Figure 2.

ln the said drawing, l indicates the crank case, Qthe crank shaft, 3 one of the -tlywheels, 4L the cylind er, and 'the head of the cylinder of a conventional type of two cycle engine.

ll. pipe ply, not shown,

6 leads from a suitable gas'supto the customary or regular gas port 7, indicated by dotted lines in Figure l, and said cylinder is likewise provided with ythe customary air vsupply port A and exhaust port E, not detailed. y

'The head ot the cylinder is provided with a port 8, disposed beyond the extreme rearward position which the piston 9 attains in the operation of the engine. A fvalve casing l0 is rigidly secured to the cylinder head 5, and around port 8, and connecting with said casing at opposite sides thereof is an air inlet pipe 1l and a gas supply pipe l2, the latter constituting, ir' desirechan extension of the gas supply pipe 6.

which f Mounted in said casing 10, is a valve 13, provided with a port 111 and a port 15, which ports are adapted to simultaneously register with pipes 11 and 12v respectively when the valve is open, and said ports also connect with a third or axial port 16, coniinunicating with the port 8.

The outer end of the valve casing is closed by a cap 17, through which a reduced portion of the valve extends, and mounted rigidly on said reduced portion is a handle 18 whereby the valve may be turned. ln pre'- erred construction, said handle is' pivotally connected by a rod 19 with a hand lever 2O mounted upon a sector 21 secured to the frame of the engine at the crank shaft end thereof, so that said lever shall be conveniently accessible to the attendant when starting the engine.

Assuming that it is desired to start the engine and that the piston thereof is at the rearward end of its stroke, the operator steps upon one of the spokes of the flywheelthese engines usually have two fly-wheels at opposite sides-and grasps the rim of the wheel at a higher point so that he can add his weight to the pulling force which he applies in the rocking of the wheel to eect piston movement from the position a to the position b, it being understood that preliminary to this rocking movement he has first manipulated lever 2O to establish connection between the air andv gas pipes 11 and 12 respectively, and the port 8, so that in said piston movement a suctional action is produced which draws into the cylinder a mixture of air and gas. As this rocking move ment ends the operator grasps and operates lever 2 0 so as Vto turn valve 13 suiiiciently to dispose its passages 14 and 15 out of registration with the airl and gas pipes mentioned, this action sealing or closing port 8. The operator now steps to the opposite side of the wheel and as before, disposes his weight upon one of the elevated spokes, and grasping the rim, rocks said wheel inthe reverse direction to that first mentioned, this action moving the piston rearward or toward its original position, and compressing the charge of a combustible mixture of air and gas between the piston and the head ot the cylinder. At the propery time in this movement, the customary magneto, not shown, is tripped to produce a spark in the cylinder and thereby lire or .explode the compressed mixture therein. The explosion of the charge drives the piston forward, and the engine continues to operate thence forparent that I have produced starting mechanisni for two cycle internal combustion engines, embodying the features of advantage set torth as desirable in the statement of the object ot the invention, and which is obviously susceptible ot modification in minor particulars without departing from the principle of construction and mode of operation involved.

1 claim:

1. ri. valveless two-cycle gas engine hava port in the head end et the cylinder, a e

ing val v sage communicating with the said port and also having air and gas passages communieating with the lirst-named passage, an auxiliary gas and air supply in communication with the said air and gas passages of the valve for supplying combustible mixture to the cylinder under suction produced by the advance of the piston, and manual means to actuate the valve to close the supply of coni bustible mixture to the engine at the end oi' such advance movement of `the piston, to trap such mixture and thereby effect its compression through the ensuing reverse movement of the piston.

2. A valveless two-cycle gas engineprovided with a cylinder port at its head end beyond the rearmost travel of the piston of the engine, a valve casing, a threeway valve journaled in the casing with one of its ports in connection with said cylinder port,` an air supply in connection with one of the other ports of said valve, a lgas supply in connection with the third port ot said valve, and manually operable ineansOi1 closing said valve to cut ofi' the supply of air and gas to the cylinder. i y 3. A valveless two-cycle gas engine provided with a cylinder port at its head end beyond the rearmost travel of the piston ot the engine, a valve casing, a three-way valve `iournaled in the casing with one'of its ports in connection with said cylinder port, an air supply in connection with'one or the other ports of said valve, a gas supply in connec` tion with the third portosaid valve,fa hand lever, and means for transmitting power from the hand lever to said valve to close the latter.

ln testimony whereof, l ture.

my signa seni/innil i3.y conn,

casing, a valve therein having a pas-A

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