US541856A - Valve mechanism - Google Patents

Description

(No Model.) 7 3 Sheets-Sheet; 1. P. P. HIGH.

VALVE MECHANISM.

Patented July 2,1895.

(No Model.) 3 Sheets- SJheet 2.

P. P. HIGH. l VALVE MECHANISM.

No. 541,356. Patented July '2, 1895.

INVENTOR fiederck 1? 55 ATTORNEY (No Model.) 7 3 Sheets-Sheet 3. P. P. HIGH.

VALVE MEOHANISM. No. 541,856. Patented July 2, 1895.

INVENTOR ATTOR N EY lNrTnn STATES PATENT FFICE.

FREDERICK P. HIGH, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR OF ONE- HALF TO FRANK BURT, OF MANNINGTON, WEST VIRGINIA.

VALVE MECHANISM.

SPECIFICATION forming part. of Letters Patent. No. 541,856, dated July 2, 1895. Application filed February 26,1896. Serial N5. 639,727. (no model.)

To all whom it may concern.-

Be it known that I, FREDERIGK P. HIGH, a citizen of the United States, residing at Pittsburg, Allegheny county, State of Pennsyl- Vania, have invented a new and useful Improvement in Valve Mechanism to Produce a Variable Cut'Off, of which the following is a specification.

My invention is of particular importance when used in connection with locomotive engines, although it is generally applicable to I all forms of engines in which a supplemental valve is utilized in regulating the cut-off or lead of steam into the cylinder.

The objects of myinvention are to provide a cut-off regulating mechanism, simple in construction, accessible for repairs or adjustment, inexpensive, and so constructed that it is impossible toslip an eccentric.

My invention is illustrated by the accompanying drawings, in which Figure 1 is a side elevation of my invention attached to a locomotive. Fig. 2 is a plan view of a detailed portion of my invention. Fig. 3is a plan View of a portion of my invention. Fig. 4 is a plan View of that portion of my invention shown in Fig. 3, and partly in section. Fig. 5 is a side elevation of the part shown in Fig. 3. Fig. 6 is a perspective view of a detailed portion of the invention, and Fig. 7 is a part sectional elevation of the mechanism shown in Fig. 3, the section being taken on the line 0c.r, looking in the direction of the arrow indicated thereon.

Similar letters referto similar parts through out the several figures.

A is a steam chest or valve casing which carries the valve regulating the cut-off, or lead of steam into the cylinder. In place of the link motion 110W ordinarily in use whereby the throw of the valve in the steam chest is regulated, I substitute the mechanism constituting the subject matter of my invention.

B is a valve-stem leading into the chest A and connected to the valve therein.

D is a disk shaped plate adjustably supported as hereinafter described, so as to perform the function of an eccentric-cam.

E is a strap bearing around a peripheral edge of the eccentric cam D.

F is the eccentric rod rigidly secured to the ring E and pivotally attached at its opposite end to the valve stem B.

G is a revoluble shaft, carrying by preference journals G G, bearing insuitable journal supports H II. Cranks I I are fixed on the opposite ends of the shaft G and said cranks are pitched with reference to each other in planes passinglongitudinallythrough the shaft and at right angles to each other.

J J are cranks fixed to the driving wheels. The crank I and the crank J on the same side of the engine should liein parallel planes, as shown in Fig. 1.

K is a connecting rod between the driving wheels and connecting the cranks J J.

L is a pitman connecting the crank I on the shaft G with the rod K so that as the engine is advanced or backed, the movement of the connecting rod K will transmit motion to the crank I so thatthe cranks I and J will move together and keep in parallel planes.

The eccentric-cams D D are loosely mounted on the shaft G so that by means of the device hereinafter described, the said cams may be moved nearer to or farther away from the axial center of the shaft G, for the purpose of giving more or less throwto the valve stem B with which the said eccentric-cams are connected as above described. The eccentriccatn D is prevented from moving longitudinally on the shaft Gby the presence of a fixed journal G on one side and the fixed crank I on the other side.

M M are wedges located in pairs on each end of the shaft G and adapted to be moved longitudinally thereon, the outer or inclined edges of the said wedges inclining in the same direction. (See Figs. 4 and 6.) These wedges M M pass through the eccentric cam D and support the same, there being channels, similar to key seats in the perforation in each of the eccentric-cams through which the shaft G and wedges M M pass. By shifting the longitudinal position of the wedges M M the position of the eccentric-cams D D will be changed so that the throw of the eccentric-rod F communicating with the valve-stem B may be varied. To cause the wedges M M to shift, any suitable mechanism may be provided, the device for accomplishing this purpose herein illustrated, being the preferable form.

ping an eccentric.

N is a ring loosely mounted at a point intermediate in-thelength of the shaft G. This ring is connected to the wedges M M by suitable links 0 0.

P is a rectangular lever, one end of which is suitably connected to the ring N and the other end is suitably connected to the rod Q which leads back to the reversing lever R so that by moving the reversinglever R forward or back the longitudinal position of the ring N upon the shaftGis changed, thereby shifting the longitudinal position of the wedges M M, thereby changing the lateral position of the cams D D for the purpose described.

In operation the parts being light may be shifted very easily. The bearing points being V few require little oil, and the entire mechanism may be readily inspected to ascertain the condition of the parts. A workman of ordinary skill can readjust or insert new parts, whereas, to repair or reset the link mechanism it requires most expert workmanship. By preference the ends of the shaft G upon which the wedges M M find their support, are channeled as shown in Fig. 6, so that the wedges act as splines between the parts G and D thereby preventing the possibility of slip- The connecting parts by which motion is transmitted may be substituted by any well known mechanical means, without disturbing the essential portion of my invention.

It is obvious that without departing from the spirit of my invention the wedges M M might be secured to the revoluble shaft G, and the said shaft might be so mounted that it could partake of longitudinal movement, thereby performing the function of shifting the lateral position of the cam M. In such an event suitable bearings for the cam M could be provided to prevent side displacement of the said cam.

Having thus described my invention, what I claim, and desire to secure by Letters Pat- 'ent, is-

1. An adjustable valve mechanism, consisting of a shaft G, journal G journal support H, saidshaft G being adapted to be revolved in keeping with the revolutions of the main shaft, a cam wheel supported on said shaft,

and means for varying the lateral position of longitudinal adjustable wedges M M to give lateral adjustment to said cam wheel, and with means for rotating said supplemental shaft, and for shifting the position of the wedges M, substantially as and for the purpose specified.

3. A variable cut-off mechanism, consisting of a supplemental revoluble shaft G, crank I and pitman L communicating with a connecting rod K, longitudinally adjustable wedges supported in channels toward the end of the shaft G, said wedges passing through a cam wheel, said cam wheel communicating with the valve-stem through the medium of an eccentric strap and rod and means for moving the wedges longitudinally to vary the lateral position of the cam wheel with respect to its position on the shaft, substantially as and for the purpose specified.

4. A supplemental shaft G, a cam-wheel D loosely mounted thereon, acrank land a journal G fixedly secured to the said shaft on each side of said cam-wheel, wedges M M each having inclined outer surfaces supporting the cam-wheel D, recess in the crank I and journal G to permit longitudinal movement of the said wedges with means as described for revolving the shaft G and varying the longitudinal adjustment of the wheels, substantially as and for the purpose specified.

5. A variable cut-off mechanism consisting of a revoluble shaft G having squared channeled ends, longitudinally adjustable wedges carried in said channelseccentric cam wheels adapted to fit over the square end of the shaft and wedges, said cam wheels transmitting motion to the valve-stem as described, a collar N loosely fitting on the shaft G, the bell crank P and connecting rod Q for moving the collar longitudinally upon the shaft to vary the position of the wedges and thereby the position of the cam wheel, substantially as described.

6. An adjustable valve mechanism, consisting of a shaft G having square ends, longitudinally adjustable Wedges M M mounted thereon in channels, a ring N longitudinally movable on said shaft, and link 0 0 connecting said ring with said wedges, and means for shifting the longitudinal position of the ring N, in combination with the eccentric camwheel D, and means for transmitting motion to the valve-stem, and with the crank I and journal 'G, recessed'as shown to permit longitudinal adjustment of the wedges, substantially as and for the purpose specified.

FREDERICK P. HIGH. Witnesses:

J AS. A. KALBAUGH, CHAS. F. LINDSAY.

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