US927694A - Valve mechanism. - Google Patents

Description

W. H. & F. M. SPAYD.

VALVE MECHANISM.

APPLICATION FILED APR.16.1908.

2 SHEETS-SHEET 1.

Patented July 13, 1909.

wwwmain@ fA f A @Noruega www ANDREW. a.

W. H. & F. M. SPAYD.

VALVE MEGHANISM.

APPLIOATION FILED 15m16.190s:

Patented July 13, 1909.

2 SHEETS-SHEET 2.

Auunaw. a enum ce Pu f worms-1 as AsmN 1 4 v L UNITED STATES PATENT OFFICE.

WALKER H. SPAYD AND FRED M. SPAYD, OF VAN WERT, OHIO.

VALVE MECHANISM.

To alt whom it 'may concern:

Be it known that we, VALKER II. SPAYD and Fenu M. SPAYD, citizens of the United States, residing at Van Vert, in the county of Van I'Vert and State of Ohio, have invented certain new and useful Improvements in Valve Mechanism; and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to valve mechanisms, and particularly to valve mechanisms employed in operating the exhaust of explosion engines.

The object of the invention is to provide a simple, cheap and efficient valve gear for operating the exhaust valve of four cycle explosive engines.

A further object is to provide simple means to disconnect the exhaust valve operating rod whereby upon the compression stroke of the engine the exhaust valve remains closed, and further means controlled by the ignition circuit for throwing the valve mechanisms into action upon the exhaust or scavenging stroke of the engine.

Wv ith these and other objects in view, the linvention consists of certain novel features of construction, combination and arrangement of parts, which will be more fully described and particularly pointed out in the appended claims.

In the drawings, Figure l is a side elevation partly in section, showing the position of the parts at the beginning of the compression stroke; F ig. 2 is a transverse sectional view taken on the line :2cm of Fig. l; Fig. 3 is a diagrammatic View, in side elevation, showing the part-s in the same position as in Fig. 1 and the relation between the valve gear magnet and the engine shaft.

Referring more especially to the drawings, l represents an explosion engine, and 2 an exhaust valve port leading from the chamber to the exhaust pipe 3. Secured to the cylinder in any suitable manner is a casing 4, in which is slidably mounted the exhaust valve rod 5 carrying at its outer end the exhaust valve 6, adapted to close the port 2. This rod is slidably mounted between the top of the casing 4, and a horizontal rib 7, formed on one side of the casing so as to form a guide for and prevent any vertical or lateral swinging of the rod. Sliding in the casing iu an opposite direction from the rod 5 is a Specication of Letters Patent.

Application led April 16, 1908.

Patented July 13, 1909.

Serial No. 427,436.

rod operating link 8, provided with knuckle 9, which enters the bifurcated end of the cone rod 10. This rod l0 is provided at its outer end with a friction roller 1l, which engages a cam l2, keyed to the driving shaft I3, of the engine. A suitable spring 1l holds the valve 6 upon its seat, and a spring l5 maintains the friction roller 1l in engagement with the eccentric. The inner end of the rod 5 is beveled and notched as at 16, and the inner end of the link S is oppositely beveled and notched as at 17, so as to properly engage the beveled and notched edge of the rod 5.

Pivoted to the sides of the frame upon a transversely extending bolt 18, is a trigger 1%), controlled by a spring 20, which normally throws the trigger upward to its limit. A spring arm 2l, extends out from the rear end of the trigger and engages the corner of the casing and flexibly limits the movement of the trigger. At certain periods during the operation the trigger is adapted to engage a notch 22 formed in the upper edge of the link for a purpose which will be here.- inaftcr described.

Depending from a pair of lugs 9.3, formed integral with the side of the casing is a supporting arm Q4, having positioned upon its outer end an electromagnet 25, whose armature 26 is carried upon the forward end of a lever 27, pivoted between the sides of the casing and carrying at its rear end a friction roller 28, adapted to engage the under side of the link 8 to force it up against the top of the casing.

In Fig. 2 we have illustrated a simple way to operate the magnet 25. This consists in keying to the driving shaft a pinion 29 which operates a gear 30 of twice its size carried upon a shaft 31 upon which there is also a wiping cam 32. This cam is adapted to wipe against the spring contact finger 33 of the switch S so as to force it into en gagement with the anvil contact and closes the primary circuit of the spark coil S. The primary of this spark coil is inclined in circuit with a suitable battery B and a switch S2 together with the magnet 25. The secondary of the coil has its terminals connected directly to the opposite points upon the spark plug I). As the cam 81 rotates once for every two revolutions of the cam l2 and is slightly advanced thereover it will be noticed that by following out the order of strokes the cam only wipes into contact with the spring finger 33 at each compression stroke of the engine, or upon every tour strokes of the piston. As engines of the Jfour cycle type only receive one explosion for every two revolutions of the iiy wheel it is necessary that the exhaust mechanism be operated only during the stroke immediately after the power stroke and that it should not be open during the suction or compression strokes of the engine, and only during a partial portionothe scavenging stroke. In order to accomplish this we position the cam disk 12 so that it operates upon the cam rod 10 and the link 8 in `such a manner that Athe end 17 vwhen in vengagement with the end 16 carries the valve forward and holds the port f2 open until the greater part of the scavenging stroke has been completed. Then the springs 14 and 15 return the .parts to normal and before the lower side vof the cam disk 12 is reached the notch 32 is engaged by Athe forward end of the trigger and depresses the inner end 17 of the link 8 away from the valve rod 16, thus disconnecting the parts and :allowing the link S, upon the .next or compression stroke of the engine to pass beneath the rod 5 without engaging it. 1When, however, the ,sparker mechanism is operated bythe cam 32, the magnet 25, which is included in the primary circuit thereof is energized to :throw the friction wheel 28 into engagement with the link 8 and force it up into the path of t-he rod 5. As the trigger 19 has already been released from the notch 22 upon the suction stroke and forced to normal bythe spring 2O the link 8 is free to rise to the top of the casing. The spring arm 21 retains the point of the trigger sutliciently far below the top of the case so that it will engage `the notch 2Q. when vthe link 8 is retracted .and permits it to be forced upward by the link yuntil the notch is reached, when .the spring larm 21 overcomes the -spring 20 and ,throws the engaging point into the notch.

From the Lforegoing description, taken in connection with the accompanying drawings, the construction and .operation or' the invention will be readily understood without rcquiring a more extended explanation.

Various changes in the form, proportion and the 'minor details of construction may be bythe sparker circuit of the 4engine to throw said valve operating means i-n-to operative position, and means to render said valve operating mea-ns inoperative.

2. In a valve operating mechanism for explosion engines, a valve, a pivoted li-nk adapted to engage the valve rod, means controlled by the engine for operating said link, `means controlled by the sparker circuit of lthe engine for throwing said link into engagement with lthe valve rod, means for reciprocating said link, and means -for throwing said link out of engagement with the valve rod and holding it in such position Jfor a predetermined time.

3. In a valve mechanism for explosion en gines, t-he combination -wit-h a valve, of a power shaft Ihaving a cam thereon, a rod driven by `said cam, a link pivoted to said rod adapted to engage said valve rod to open the valve aforesaid, an electromagnet in series with the sparker circuit, rneans controlled by said magnet :tor throwing the link into engagement with -the valve rod, and a trigger adapted to engage the link upon retrograde movement of the rod to break the connection of the link with the valve rod and to, hold said link in inoperative position during the next `forward ymovement thereof.

In testimony whereof we have hereunto set our hands in presence of :two subscribing witnesses.

i/VALKER H. SIAYD. FRED M. SPAYD.

YVitne/sses C. II. ADE,

EDWARD C. Srrrz.

Images