US156008A - Improvement in hydraulic motors - Google Patents

Description

W. 0. WAKEFIELD. Hydraulic-Motors.

Patented 0ct.13,1874.

k l I "if THE GRAPHIC c0. PHUTO'LITH-ifik I PARK PLAOI, NlY.

UNITED STATES PATENT OFFICE.

WILLIAM O. WAKEFIELD, OF BOSTON, ASSIGNOR OF FOUR-FIFTHS HIS RIGHT TO CHARLOTTE MORGAN, OF MELROSE, MASSACHUSETTS.

IMPROVEMENT IN HYDRAULIC MOTORS.

Specification forming part of Letters Patent No. 156,008, dated October 13, 1874; application filed September 18, 1874.

To all whom it may concern:

Be it known that I, WILLIAM O. WAKE- FIELD, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain Improvements in Hydraulic Motors and I do hereby declare that the following, taken in connection with the drawings which accompany and form part of this specification, is a description of my invention sufficient to enable those skilled in the art to practice it.

My improvements relate to hydraulic motors and consist, primarily, in a peculiar construction of the valve; also, in affixing to a yoke on the valve-stem an arm or guide-finger operating, in conjunction with fixed stops on the body of the case, to guide and limit the movements of the valve in a special construction of the valve-head; in a special construction of a shifting cam-ring; and in other details hereinafter set forth.

Figures 1 and 2 are elevations, showing the apparatus in two positions. Fig. 3 is a perspective of the valve and part of the valvestem; and Fig. 4 is an elevation of the valvehead, with the cam-ring shown in section.

A is the body of the valve, provided with an inlet, a, long ports I) c, and an outlet (not necessary to be shown) in one of its heads, and communicating with one of the openings or quadrant-chambers e in the valve for the final discharge of the water from the machine, d d being other quadrant-chambers in the valve. These chambers are formed by affixing to the valve-stem four similar radial wings or webs, dividing the circle into four equal parts, the chambers d d being directly opposite each other and capped at one end, as seen at f f, and the chambers a being directly opposite each other and capped at the other end, as seen at g g. The head is formed with a rim, h, to fit tightly on the body A, with a bed or base, i, to receive the pressure of the cam-ring, with a concentric raised part, j, to receive and serve as a bearing and guide for the rotary reciprocations of the cam-ring la, and with a part, 1, adapted in shape to receive a wrench. The shifting cam-ring 7a fits snugly on the base or bed 1 and to the circular part j, and has two similar and opposite cams or double inclines, m. To the outer end of the valve-stem is socured the yoke 02, on each branch of which is preferably a friction-roller, and one of these branches has a projecting arm or guide-finger, 0, Whose movements are guided and restrained by the guide-pins p p on the body A.

The water enters at the inlet a in the side of the body, creating an equal pressure on each side of the valve and forcing it downward, bringing the yoke 12. down onto the shiftingring it. One of the long ports-say, bin the valve-body will be in communication with one of the chambers, cl, in the valve which coinmunicates with the induction-passage a. The other of the long ports will be in communication with one of the other chambers, e, in the valve which communicates with the opening or outlet in the valve-head for the final discharge of the water. The water passing in at a takes its course through the valve-chamber and through one of the long openings b or 0 into the main body of the machine or engine, (not here represented,) thus causing the motor to make one stroke.

At or just before the termination of the stroke the shifting-ring k is partially rotated by any appropriate connection (eccentric rod or otherwise) with the main piston of the engine, causing the projections or cams m m to pass under the friction-rolls or equivalent parts of the yoke, thus forcing the yoke outwardand and carrying the valve with it, the guide-pin, against which the guide-finger o is then in contact, compelling the valve to move in a right line and keep the long port open. 4

When the valve has reached its outermost point it returns, partially rotating at the same time, this partial rotation being caused by the inclines or cams m m. This causes the rela tive position of the ports in the valve-body and the openings in the valve to be exactly reversed, which will reverse the action of the piston of the motor or main engine and this piston (through its connections) will thus move the shifting-ring in a direction the opposite of its former motion, and this will again reverse the position of the valve.

The exhaust water passes from the valvechambers 0 out through an outlet (not shown) in the center of head q.

I claim- 1. The valve, constructed with two equal and opposite radial quadrant-chambers, 0', closed at one end only, and with other two similar chambers, 01 d, closed at the opposite ends, substantially as and for the purpose described.

2. The guide-finger o'on the yoke or valve- 1 stem, in combination with the guide-pins or stops 10 p on the valve-body, substantially as and for the purpose set forth.

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