US384286A

US384286A - Chaeles schmid

Info

Publication number: US384286A
Authority: US
Publication date: 1888-06-12
Anticipated expiration: 1905-06-12

Description

(No Model.) l Y SHMD.

STEAM ENGINE GOVERNOR.

Patented June 12, 1888.

UNirED STATES PATENT OEEicE..

CHAR-LES SCHMID, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO GEORGE FARNSVVORTH, OF SAME PLACE.

STEAM-ENGINE GOVERNOR.

SPECIFICATION forming part of Letters Patent No. 384,285, dated June 12, 1888.

.Application filed September 23, 1886. Serial No. .llil.

.T0 @ZZ whom it may conceive:

Beit known that I, CHARLES SGHMID, a citizen ofthe United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Imp roveA ments in StcanrICngine Governors, of which I do declare the following to be a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

My present invention has relation to the improvement of that class of steam-engine governors wherein the throw of the eccentric and the consequent movement of the valve are controlled by means of weighted arms or levers pivotally connected to the side of a governor wheel or disk keyed to the main shaft of the engine.

In this class of apparatus it has been heretofore customary to provide the governor wheel or disk with weighted levers suitably connected to an eccentric having an elongated slot which permitted its position upon the main shaft to be shifted from time to time, accord ing to the variations in the movement of the weighted arms or levers. An example of this type of mechanism is illustrated in Letters Patent No. 207,607, granted to D. OB. Ladd and George Farnsworth, September 8, 1878.

rPhe objcctof my present invention is to improve the construction ofthe governor meehanism illustrated in said patent, and governors of like character, in order that the movement of the weighted arms or levers may exert a more uniform action in shifting the position of the eccentric upon the main shaft, so that all cjcrkingt7 of such levers and the consequent irregular or spasmodic movement of the vaive may be avoided.

To this end my invention consists in the improved means for insuring a more even and positive action of the weighted arms, hereinaft-er described, illustrated in the accompanying drawings, and particularly defined in the claims at the end of this specification.

Figure lis a view in side elevation of my improved governor. Fig. 2 is a view in central cross-section on line a: of Fig. 1. Fig. 3 is an enlarged detail view of the sliding ba r and its bearing. Fig. i is an enlarged detail view in cross-section on line a: @c of Fig. 3.

(No model.)

or levers O, the movement of which serves to y vary the position of the eccentric upon the main shaft, as will hereinafter appear.

Adjoining the hub b of the governonwhecl and loosely held upon the main shaft is the long collar D, from which collar and formed integral therewith project the two long arms d and d and the shorter arms, di and di. rIhe weighted arms or levers G are connected to the shorter arms, d2 and d, of the collar D by means of the pivotcd links E and E', so that as the weighted arms are moved in an ontward direction by their centrifugal force during the rotation of thc governor-wheel the links E and E will serve to impart a partial rotation to the collar D.

From the sides of the arms d and d of the collar D project the bolts or pins d* and d5, the pin d* serving as ajournal for the end of the arm F, that is bolted, as atf, to the inner side of the eccentric G, which is held upon the main shaft between the collars g and g, iirmly keyed thereto. The bolt or pin d?, that projects laterally from the arm d. of the collar D, enters a slot, h, that is formed in the expanded end portion of the arm H, that is bolted, as shown at h', to the inner side of the eccentric. A port-ion of thcperiphery of each of the collars g and f/ is provided, respectively, with a segmental cog-gear, ci and y, the gear g2 meshing with the rack-bar il.2 upon the inner end of the arm H, while the gear g3 engages with the raclvbar K, that is bolted, as shown, to the outer side of the eccentric. The eccentric G is provided, as shown in Fig. 1, with the elongated slot or bearing G', so that the position of this eccentric upon the main shalt may be varied in order to control the extent of movement of the eccentric-arm L, that projects from the periphery of the eccentric-strap L.

To the weighted arms or levers C, near their rear ends, are connected the strong coiled springs O, which serve to impart an inward or centripetal movement to the weighted arms in order to cause them to promptly respond to any decrease of the load of the engine or of the steam-pressure, and, as will be seen, the opposite ends of these coiled springs O are connected, as at o, to a pin projecting from the side of the governor wheel or disk B.

From the foregoing construction, yto which I make no claim of invention, it will be seen that when motion is imparted to the main shaft the weighted arms or levers C will be thrown by the centrifugal force in an outward direction, and as these arms are thus thrown outwardly they impart a movement to the pivot-linksE and E, which in turn cause a partial rotation of the collar D and the arms (Z2 and di, to which they are connected. This partial rotation of the collar D causes the arms d and d thereof to move in like direction the bars F and H, and as these bars F and H are rigidly connected to the eccentric G the movement of the bars F and H tends to shift the eccentric to a more nearly central position and consequently to shorten the extent of throw of the eccentric-rod L. When the load upon the engine is lessened or the pressure of steam is reduced, the force of the springs O will tend to impart a centripetal movement to the weighted arms C and draw these arms nearerthe main shaft, and, if desired, asmaller coiledspring, l?, connected to the stud p on the side of the governor-wheel and the outer end of the arm H, may be employed to aid in controlling` the movement of the parts.

As the mechanism thus far defined is of well-known construction, the operation need not be more specifically detailed.

A difficult-y met with in the use of the mechanism above described, particularly when employed in connection with the form of slidevalve illustrated in Letters Patent granted to me and to George Farnsworth, as my assignee, August l0, 1886, was due to the fact that no provision was made for preventing the too sudden inward movement or centripetal movement of the weighted arms and consequent spasmodic or jerky action of the valve. In other words, the governor did not properly respond to the variations in the load of the engine or of the steam-pressure, because too much or too sudden freedom of movement was permitted to the weighted arms.

I shall now proceed to describe the means by which I have overcome the before-mentioned difficulty and have insured a more positive, steady, and uniform action of the governor mechanism.

To the outer ends of the weighted arms C are bolted the dependent arms or bars R, to the lower ends of which are pivoted, as at r, the upright bars S, that slide within the boxes or bearings T, that are pivotally connected by the pin t to an inwardly-projecting lug upon the rim of the governor-Wheel. The pivot boxes or bearings T are preferably formed, as shownl in Fig. 1, of the grooved bars T' and the face-plates T2, bolted thereto, as at t', and the upper portions ofthe sliding bars S are pref- .a longer throw to the eccentric.

erably provided .with perforations s, adapted to receive the pins s', by means of which a stopplate or guard, S, that limit-s the downward movement ofthe sliding bars, may be fixed at any desired position thereon. To the outer end of the pin t of each pivoted bearing or box T will be connected the coiled traction-spring vthere is a decrease in the load of the engine or of the steam-pressure, when the weighted arms or, levers C will be drawn inwardly, or toward the main shaft. As these weighted arms or levers are thus drawn inwardly by centripetal force and by the action of the springs O, their inward movement will be resisted by the springsVas the sliding bars S are forced downward within the bearings or boxes T; hence it will be seen that the springs V prevent any sudden collapsing of the weighted 'arms or levers and any consequent irregular movement of the eccentric.

If desired, there may be employed a supplemental compression spring, WV, that is sustained upon the rod fw, connected to the box T and the rim of the governor-wheel, which spring will tend to bear against the box and insure its more steady movement as the bar S slides through it.

In addition to the advantage incident to the use of the springs V, the sliding bars S, held as they are within the boxes or bearings T, guard the weighted arms against any lateral movement or shaking, and, without interfering with the proper movement thereof, tend to make this movement much more positive and regular.

By providing the adjustable strap-plates or guards S, which, as will be seen, strike against the bottoms of the boxes or bearings T, I am enabled to restrict the extent of inward movement of the weighted arms, and hence to control the degree to which these arms shall be allowed to shift the eccentric in order to give In other words, by thus limiting the inward movement of the weighted arms I am enabled to prevent these arm from shifting the eccentric to such an extent as to unnecessarily open the steamports of the engine.

It will be readily understood that the de tails of construction above set out may be varied Without departing from the spirit of my invention, and that certain features of the invention may be employed apart from the others.

Having thus described myinvention, what I IOO IlO

IZO

claim as new, and desire to secure by Letters Patent, is-

l. In a governor for valve-gears, the conibination, with the main governonwlieel and its weighted arms suitably connected with the eccentric for shifting the same on the main shaft, of two springs, V, connected both with said weighted arms and with the main wheel, whereby said springs wili exert force at all times against the inward movement of said weighted arms, substantially as described.

2. In a governor for valve-gears, the com` bination, with the main governor-wheel and its arms suitably connected with the eccentric for shifting the saine on the main shaft, of bars It, connected to the weighted arms, and springs V, connected with said bars and with the main wheel, said springs exerting force against the inward movement of the weighted arms, substantially as described.

3. In a governor for valve-gears, the combination, with the main governor-wheel and its weighted arms suitably connected with the eccentric for shifting the same on the main shaft, of adjustable guards suitably connected with said weighted arms for determining the extent oi' their inward movement, substantially as described. l

4. In a governor for valve gears, the combination, with the main governor-Wheel and its weighted arms suitably connected with the eccentric for shifting the same on the main shaft, of bars It, the sliding bars S, and suitable bearings for said sliding bars, substantial] y as described.

5. In a governor for valve-gears, the coinbination, with the main governor-wheel and its weighted arms suitably connected with the eccentric for shifting the same on the main shaft, of bars R, the sliding bars S, pivoted to said bars, the pivoted bearings T for the sliding bars, and the springs V, substantially as described.

6. In a governor for valve gears, the combination, with the main governor-wheel and its weighted arms suitably connected with the eccentric for shifting the saine on the main shaft, ofthe bars Rl, the slidebars S, the bearings T for said sliding bars, and suitable me chanisni for adjust-ing the movementof said sliding bars within the bearings, substantially as described.

7. In a governor for valve gears, the co1nbnation, with the main gove1nor-wheel and its weighted arms suitably connected with the eccentric for shifting the same on the main shalt, of the dependent bars R, the sliding bars S, the pivoted hearings T, and the snpplemental spring \V, substantially as described.

CHARLES SCHMID. llitnesses:

JAMES H. Pinnen, GEO. P. FISHER, Jr.