US281313A - Cut-off-valve gear - Google Patents

Description

(Nofmodel.)

E. P, SPAULDINGgsE' J. K. -H'ALLGUK GUT-OFF VALVE GEAR.

No. 281;313. Patents-d July 17, 1883.V

y ,UNITED- STATE-s- ELIJAII F. SPAULDING AND JOHN K.

)PATENT OFFICE.

HALLOOK, OF ERIE, PENNSYLVANIA,

ASSIGNORS OF ONE-THIRD TO ELMER S. SMITH, OF SAME'PLAOE.

CUT-oFF-VALVE GEAR.

SPECIFICATION forming part ef .Letters Patent Ne.`281,313, dated July 17, 1883. Application filed May 11, 188s. (No model.)

To all whom. it may concern,.-

Be it known that we, ELIJAH F. SPAULDING. and JOHN K. HALLocK, citizens of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented certain new and useful Improvements in the Automatic Cut-Off-Valve Gear of Steam-Engines; and we do hereby declare the following to be a full, clear, and exact description of the inven- Io tion, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to automatically-variable cut-off-valve gears for steam-engines; and it I 5 consists in combining a dynamometrical regulator operating a shifting eccentric on the engine-shaft with some other form of regulator adjusted off of the shaft, which will govern the engine against increased or decreased speed from 2o the changesinsteam-pressure. Thisvalve-gear is composed of two well-known methods of varying the cut-0H combined in one operative gear. It is old to govern an engine by a shifting eccentric on the shaft, and it is old to shift 2 5 said eccentric by a dynamometrical regulator.

It is also old to govern an engine by a linkmovement in which the variations are effected automaticallyby some type of regulator; but the combination of the two methods in one 3o valve-gear is new and constitutes the essential feature of this invention.

The invention is illustrated in the accompanying drawing in a single gure, which is a side view of part of an engine and a valve-gear embodying our invention.

A is the engineshaft. B is the drive wheel, which is mounted l loosely on the shaft A, and is connected with the cross-arm C, which is Xed to the shaft by 4o springs and rods D D', so that it is carried iieXibly and will change its position relatively to the arm Cas the load changes.

F F are levers which are moved as the wheel B changes its position relatively to the arm C. The position of parts shown is that which they occupy when the full load of the engine is on. The full-line arrow shows the direction of revolution ofthe drive-wheel, and the dotted arrows show the movement of parts when 5o the load is thrown on.

L is the eccentric, which is connectedby rods F with the levers F in such a manner that when the said levers change their position the eccentric will be rolled on the shaft and is thus shifted. This device constitutes what we have above referred to as a dynamometrical regulator, which shifts the eccentric on the shaft. rIhe construction just described may be varied, so that the eccentric can be shifted by being moved diametrically across the shaft, if it is properly constructed so to be shifted. The action of a shifting eccentric on the shaft is well known to be to vary thev Ieciprocations of the valve-rod or eccentric-rod, which in this case is the rod J.

N is a rocking link with the usual link-slot, N', and J is the valve-stem. The operation of a link-movement is too well known to need description, further than to say that in this case, as usual, the variation of the position of 7o the reciprocating valve-rod in the link-slot variesthe degree of reciprocation. In the construction shown the rod J is made variable in the slot N by the action of a steam-pressure regulator, I, (or it might be by the speed-gov- 75 ernor I, shown in dotted lilies.) This steampressure regulator is acted upon from the steam in the boiler or supply-pipe, and hence registers the condition of the steam upon the va1vegear.

It will be seen from the foregoing that the reciprocation of the link N is varied by two regulators, as follows If the load changes, the eccentric is shifted, and so the reciprocation of the link is changed, and if the steam-pressure changes (or when the regulator I is used, if the speed changes) the position of the rod J is changed in the link N, and this changes the vibration of said link also. Now, as the valve-stem is moved from thelink N, its vibrations are varied as the vibrations of the link vary. So it will be seen that we have a valve-gear in which the variations are effected by two governors acting together in one valvegear, one of which is on the shaft and acts dynamometrically, and the other is off of the shaft and is actuated from other forces than the load.

Wedo not claim in this application two regulators operated from different forces and conroo nected together by gearing which is variable from the action of one or both of said regulators, and is moved by the action of either of said regulators, and is in operative connection with the variable cutoffvalve gear of said en gine, so that the action of said gearing will automatically vary the cut-oif-valve gear 5 nor regulators, one of which may act dynamometrically in such a combination, nor regulators, one of which may act dynamometrically and the other by steam-pressure in such a combination. Nor do we claim a variable eut-off-valve gear which is acted upon to automatically vary the cut-off by two separate regulators which coact to perform said oiiice while each is free to act independently of the other, and one of which is mounted on the driving-shaft ofthe engine and acts dynamometrically, and the other mounted off of the shaft and is operated to regulate the speed of the engine. Nor do we claim such a cut-offvalve gear and regulators, one of which acts dynamometrically, and mounted on the driving-shaft, and the other by the direct action of the steam, andk mounted off of the shaft. Nor do we claim a dynamometrical regulator on the shaft of the engine, gearing adjusted off of said shaft, and connected to be operated from said dynamometical regulator, and a steam-pressure regulator mounted off of the shaft of the engine, and also connected with said gearing, so that the movement of said regulator will not only move said gearing, but also qualify its movements from the other regulator. Nor do we claim a dynamometrical regulator which shifts a collar on the engine-shaft, a rock-shaft or crank-shaft adjusted off of said engine-shaft, and having one of its arms variable, and connected by it to be operated from the said sliding collar, a seeond regulator mounted off of said engine-shaft, and adapted to vary the said variable arm of said crank-shaft, and, finally, for moving the variable cutoff-valve gear of said engine from the rock-shaft. Nor do we claim a cut-oif-valve rod, a pivoted link rocked by the action of the eccentric, in which link the said rod is movable for the purpose of varying the eutoif of the valve, and gearing for varying the position of said rod in said link, which is actuated from a dynamometrical regulator on the shaft of the engine, and a second regulator, which is adjusted off ofthe shaft of the engine, which two regulators act independently of each other upon said gearing, while one qualifies the effect of the action of the other. Nor do we claim a dynamometrical regulator on the shaft of the engine and some other type of regulator off of the shaft, said regulators being geared together to coact in the automatic reg' ulation of the variable cut-off-valve gear of said engine. Nor do we claim a variable cutoff-valve gear which is acted upon to automatically vary the cut-off by two separate regulators, one of which is mounted upon the shaft of the engine and acts dynamometrically to regulate from the changes of the load, and the other mounted off of the shaft of the engine and operated to regulate the speed of the engine, as such subjects-matter form the subjectsmatter of applications filed on an even date with this application.

What we claim as new is- In a steam-engine, an automatically-variable valvegear for regulating the cut-off, which consists of a shifting eccentric on the shaft which is operated upon by a dynamometrical regulator, and a link-movement off of the shaft which is operated upon to vary the cut-off by a second regulator mounted olf of the shaft, substantially as and for the purposes mentioned.

In testimony whereof we affix our signatur; s in presence of two witnesses.

ELIJAH F. SPAULDING. JN O. K. HALLOGK.

Witnesses Rom. H. PORTER, JACOB F. VALTHER.

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