US270842A - Reversing-gear for engines - Google Patents

Description

(No Model.)

P. W. RANDALL.

REVERSING GEAR FOR ENGINES.

No. 270,842. Patented Jan. 16.1883.

w. w W I N. PETERS. Plmlo-Lilhogmphcn Washingicn. D. C.

UNIT D STATES PATENT OFFICE.

FRANCIS W. RANDALL, OF TEKONSHA, MICHIGAN.

REVERSlNG-GEAR FOR ENGINES.

SPECIFICATION forming part of Letters Patent No. 270,842, dated January 16, 1883.

Application filed September 23, 1882. (No model.)

To all whom it may concern Be it known that I, FRANCIS W. RANDALL, a citizen of the United States, residing at Tekonsha, county of Calhoun, State of Michigan, have invented a new and useful Reversing-Gear for Steam-Engines, of which the following is a specification.

The object of my invention is to effect certain improvements in reverse-gears to facilitate their operation.

A further object is to control the stroke of the pitman with the same lever which operates the reverse-gear.

In the drawings forming a part of this specification, Figure lis a side view, looking from line 1 1 in Fig. 2, the shaft at this point being in section; Fig. 2, a top view with portions at the right broken away. Fig. 3.shows a modification in the construction of the reversing-lever; Figs. 4, 5, and 6, broken or detached parts, hereinafter described.

R is the main crank-shaft, with which the connecting-rod f of the engine is connected. The connecting-rod is hereshown broken, with the end for locating in the cylinder left out.

F is the crank-shaft for operating the valve, located horizontally and parallel with the main shaft R; S, valve-rod, which in an engine extends into the steam-chest. The ends of shafts R F farthest removed from the crank-disks A and I are provided with gear-wheels D B. P is a pin-wheel meshing with said gear-wheels. This pin-wheel is pivoted to a slide, or :10, which is movably located on rods e e in a manner to be raised or lowered. The vertical rise and fall of slide ac w is limited by stops 0 e, which are set at given points on the rod bya set-screw.

a is a double lever in the form of a bellcrank, pivoted to a support, H, with its upper arm pivotally connected with slide as in a lengthened slot, m, Fig. 4. This slot m prevents any cramping of parts during the operation, as lever a describes the arc of a circle, while slide a: 00 moves vertically. Rod t connects lever a with hand-lever L, Fig. 1. Said .hand-leveris. hinged .to bracket h, Fig.6.

The crank-pin o of the valve-shaft is set at an angle with shaft F, and valve-rod S is laterally movable thereon by means of a perforated ball-joint, a, said joint permitting the bearing to accommodate itself to any position in which the pin '0 may assume during the revolution of the valve-shaft. Rod 11 con- :nects the valve-rod S with bell-crank c c, and

rod 1' connects said bell-crank with hand-lever pin-wheel I. The movement of the pin-wheeldescribes the fractional part of a circle; but as the teeth of the gear-wheels D B are made long and the movement is slight there is no liability of any disengagement of said gears with the pin-wheel.

In the operation, by raising pin-wheel P by means of lever L and connections the relative position of the gear-wheels D and B is changed, which also changes the position of the pin upon which the valve-rod is attached, thereby moving the valve to any predetermined position, or far enough to reverse the engine. The same movement of lever L throws the valverod S to a dili'erent location on the oblique crank-pin o, 2, shortening orlengthening the throw of the valve, as desired.

Having thus described my invention, what I claim as new is- 1. The movable slide provided with the pinwheel, the double pivotedlever, the hand-lever, and connecting-rods, in combination with the valve-rod and piston-shafts provided with the gear-wheels.

2. The pitman and piston shafts provided with the gear-wheels, and the slide bearing the pin-wheel, in combination with the postsupports provided with the stops for limiting the movement of said slide, substantially as specified:

3. In a steam-engine, the slotted hand-lever, in combination with the valve-rod located on the oblique crank-pin in a manner to move laterally'i-the movable pin-wheel, and connecting means, all substantially as specified and shown, whereby the gear is reversed and the throw of the. valve is controlled by one lever and at the same time.

FRANCIS W. RANDALL.

Witnesses:

FRANK O. Gums, ARTHUR A. DAVIS.

Images