US841934A - Single-eccentric reversing-gear for steam-engines. - Google Patents

Description

No. 841,934. PATENTED JAN. 22, 1907.

s. M. GOPFMA-N. SINGLE EGGBNTRIG REVERSING GEAR FOR STEAM ENGINES.

APPLICATION FILED JULY 11, 1905.

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UNITED STATES P ifENT oFFioE.

SAMUEL M. GOFFMAN, OF BRAYMER, MISSOURI.

SlNGLE-ECQENTRIC REVERSlNG-GEAR FOR STEAM-ENGINES.

Specification of Letters Patent.

Patented Jan. 22, 1907.

Application filed Julyll, 1905. Serial No. 269.187.

T0 at whom it may concern.-

Be it known that I, SAMUEL M. OoFFMAN,

a citizen of the United States, residing at Braymer, the county of Caldwell and State of Missouri, have invented certain new and useful Improvements in Single-Eccentric ReversingGears for Steam-Engines, of which tion of the rod of the eccentric, mounted upon the crank-shaft of the engine, in such manner as to dispense with the double eccentric and the cumbersome link usually employed.

It comprises means for reversing the position of the eccentric-rod while the engine is in motion when desired, so as to completely throttle the engine while it is turning in one direction and subsequently to position the valve so as to cause the engine to turn in the opposite direction.

With my invention the finest adjustment of the valve from full steam in one direction to full steam in the other is readily and accurately attained, and as there "are. no sliding parts the operation of my reversing-gear will be attended with the least possible friction.

In order that the invention may be fully understood, reference will now be made to the accompanying drawings, in which Figure 1 represents a perspective view of an engine-frame provided with my improvements. Fig. 2 is a vertical section of my improved mechanism, taken on line II II of Fig. 3. Fig. 3 is a plan view of same; and Fig. 4 is a transverse section of the enlarged end of a rocker-shaft employed in carrying p ut the invention, taken on lineIV IV of In said drawings, 1 designates the engineframe. 2 designates a rocker-arm suitably mounted thereon and pivotally connected to the adjacent end of a valve-stem 3 and a connecting-rod 4. Connecting-rod 4 is pivotally secured at its rear end between a pair of aws 5, formed integral with the upper portion of an eccentric-rod 6, extending upwardly from an eccentric-strap 7, the inner surface 8 of which is segmental in cross-section in order to snugly embrace the crowned periphery 9 of an eccentric 10, rigidly secured upon a crankshaft 11 of the engine by means of set-screws 12.

13 designates a pillow-block projecting upwardly from the rear portion of the engineframe and provided at its upper end with a bearing 14 for the reception of a horizontal rocker-shaft 15, provided at one end with a crank-arm 16 and at its opposite end with an annular shoulder 17, through which a transverse pin 18 extends.

19 designates a yoke consisting of a pair of diver ing arms 20, arranged on opposite sides of caring 14 and united at their converging ends by a V-shaped portion 21, having an integral centrally-disposed arm 22, ter

minating at its free or swinging end in aball 23. Ball 23 is mounted in a socket 24, arranged in the upper end of the eccentric-rod, and a cap 25, which latter is secured to said eccentric-rod with bolts 26 and provided with an oil-cup 27, communicating at its lower end with the ball-and-socket joint, so the same may at all times be kept lubricated.

Pin 18 is held from longitudinal movement by an integral head 28 at one end and a nut 29 engaging its opposite threaded end 18 said head and nut bearing against the terminals of arms 20 20 gage internal threads in arm 20, which cause pin 18 to rock with yoke 19, and all lost motion occasioned by wear on said pin and its bearings is taken up by a block 30 and an adjusting-screw 31. Block 30 is slidingly arranged in the enlarged end of bore 3O" and provided with a semicircular recess 30, which snugly fits the adjacent side of pin 18. Adjusting-screw 31 is provided at its outer end with a head 32 for the reception of a wrench,'whereby said screw is operated. Its inner end bears against the inner end of block 30, thus controlling the pressure of said block against pin 18 and the pressure of the latter against its bearing-surfaces in shoulder 17.

33 designates a wrist-pin projecting from the lower end of crank-arm 16 for the recep- Threads 18 ention of the forward end of a connecting-rod 34, pivotally secured at its rear end to a reversing-lever 35, fulcrumed at its lower end. upon a pin 36', projecting from the lower portion of a notched segment 37.

When the engine is running in a' given direction under alight head. of steam and it is desired to admit more steam to the cylinder, the valve is moved forwardly by throwing the reversing-lever backwardly until its latch 38 engages the desired notch in segment 37. This movement of the reversinglever draws the lower end of crank-arm 16 rearwardly, partly rotating rocker-shaft 15,

which carries yoke 19 therewith. Partial rotation of the yoke adjusts the upper end of the eccentric-rod forward slightly through the instrumentality of the ball-and-socket connection to the position shown in Fig. 1. The forward movement of the upper end of the eccentric-rod advances the valve through the instrumentality of connecting rod 4, rocker-arm 2, and valve-stem 3, so that the ports will be uncovered to a greater extent when the valve reaches the end of a forward stroke. The direction of the engine may be readily reversed by throwing the reversinglever forwardlyin the direction of arrow a until latch 38 engages one of the forward notches on segment 37, or the engine maybe comletely throttled by moving the reversingever to a vertical position, so that latch 38 will engage central notches 39 of the segment. After the yoke has been adjusted to the desired position it will be reliably held from further rotation by latch 38 engaging one of the notches in the segment, although the ball end of said yoke will be free to oscillate or move up and down with the eccentricrod, the upper end of which latter is permitted to describe the same are as that of the ball end of the yoke through the instrumentality of the crowned periphery 9. Consequently it will be impossible for the ball-andsocket joint to become cramped.

From the above description it is apparent that I have produced a reversing mechanism which is simple in construction, accurate in operation, and owing to the absence of sliding parts its operation will be attended with but little friction or wear.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a reversing-gear for engines, the combination with a valve mechanism, of gearing for transmitting motion from the crank-shaft of the engine to said valve mechanism, a member for adjusting said gearing, said member being arranged to oscillate on its transverse axis and rock on its longitudinal axis, and means for rocking said member.

2. In a reversing-gear for engines, the combination with a valve mechanism, of gearing actuated by the crank-shaft of the engine and including a rod connected to said valve mechanism for operating the same, a mem ber for adjusting said rod, said member being arranged to oscillate on its transverse axis and rock on its longitudinal axis, and means for rocking said member.

3. In a reversing-gear for engines, the combination with a valve mechanism, of gearing actuated by the crank-shaft of the engine and including a rod connected to said valve mechanism for operating the same, a yoke loosely connected at one end to said rod and pivotally mounted at its opposite end, and means for partially rotating said yoke.

4. A reversing-gear for steam-engines consisting of an eccentric having a crowned pe riphery, an eccentric-strap encircling said eccentric and provided with an inner surface snugly fitting its crowned periphery, an eccentric-rod secured to the eccentric-strap and the valve mechanism of the engine an oscillating member for adjusting the opposite end of said eccentric-rod, and means for controlling the oscillating member.

5. A reversing-gear for steam-engines consisting of an eccentric, an eccentric-rod suitably mounted thereon lor transmitting motion to the valve mechanism of the engine a yoke pivotall y mounted at one end and loosely connected at its opposite end to the eccentric-rod, and means for partially rotating said yoke in either direction.

6. A reversinggear for steam-engines consisting of an eccentric, an eccentric-rod suitably mounted thereon for transmitting motion to the valve mechanism of the engine an oscillating member jointed at its swinging end to said eccentric-rod for the purpose of adjusting the same, arocker-shaft to which said oscillating member is pivotally secured, and means for partially rotating said rockershai't in either direction.

7. A reversing-gear for steam-engines consisting of an eccentric, an eccentric-rod suitably mounted thereon for transmitting motion to the valve mechanism of the engine an oscillating member jointed at its swinging end to said eccentric-rod for the purpose of adjusting the same, a rocker shaft upon which said oscillating member is pivotally mounted, a crank-arm secured to said rockershaft, and a reversing-lever suitably secured to said crank-arm.

8. A reversing-gear for steam-engines consisting of an eccentric, an eccentric-rod suitably mounted thereon for transmitting mo tion to the valve mechanism of the engine an oscillating member for adjusting said eccentrio-rod, a rocker-shaft, a shoulder formed integral therewith, a transverse pin extending through said shoulder and carrying the oscillating member, a block slidingly arranged in the rocker-shaft, an adjustingscrew also arranged in said rocker-shaft and adapted. to force the block into contact with the transverse pin, and means for controlling said rocker-shaft.

9. In a reversing-gear for engines, the combination with a valve mechanism, of gearing actuated by the crank-shaft of the engine and including a rod connected to said valve mechanism for operating the same, an oscillating member for adjusting said rod, a rocker shaft, a transverse pin extending loosely through said rocker-shaft and carrying the oscillating member, means for taking up lost motion occasioned by wear on said pin and its bearing in the rockershaft, and means for operating said rocker-shaft.

10. In a reversing-gear for engines, the

com bination with a valve mechanism, of gearing actuated by the crank-shaft of the engine and including a rod connected to said valve mechanism for operating the same, a member for adjusting said rod and'connected thereto bya ball-and-socket joint, said mem ber being arranged to oscillate on its transverse axis and rock on its longitudinal axis, and means for rocking said member.

11. In a reversing-gear for engines, the combination with a valve mechanism, of

gearing for transmitting motion from the crank-shaft of the engine to said valve mechanism, a yoke for adjusting said gearing, said 15 yoke being arranged to oscillate on. its trans verse axis and rock on its longitudinal axis, and means for rocking said yoke.

In testimony whereof I afiix my signature in the presence of two witnesses.

SAM [E L M. COFFMAN. Witness es MINNIE ANDRE, IRA JAMES.

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