US351188A

US351188A - matthews

Info

Publication number: US351188A
Authority: US
Publication date: 1886-10-19
Anticipated expiration: 1903-10-19

Description

6 Sheets-Sheet 1..

(No Model.)

B. MATTHEWS.

GOVERNOR FOR STEAM ENGINES.

No. 351,188. Patented Oct. 19, 1886.

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(No Model.) 6 Sheets-Sheet 2.

R. MATTHEWS. I

GOVERNOR FOR STEAM ENGINES.

Patented Oct. 19, 1886.

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6 Sheets-Sheet 3.

(No Model.)

R. MATTHEWS. GOVERNOR FOR STEAM ENGINES.

Patented Oct. 19,1886.

(No Model.) 6 Sheets-Sheet 4.

R. MATTHEWS.

GOVERNOR FOR STEAM ENGINES.

N0. 351,188. Patented Oct. 19, 1886.

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6 Sheets-Sheet 5. R. MATTHEWS.

GOVERNOR FOR- STEAM ENGINES. No. 351,188.

Patented Oct. 19, 1886.

(No Model.) 6 Sheets-Sheet 6.4 R. MATTHEWS.

GOVERNOR FOR STEAM ENGINES. No. 351,188. Patented Oct. 19, 1886.

UNITED STATES PATENT Erica.

ROBERT MATTHEWVS, OF GREEN BANK, HYDE, COUNTY OF CHESTER, ENGLAND.

GOVERNOR FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 351,188, dated October 19, 1886.

Application filed June 29, 1886. Serial No. 206,628.

To all whom it may concern:

Be it known that I, ROBERT MATTHEWS, a citizen of England, residing at Green Bank, Hyde, county of Chester, England, have invented a new and useful ImprovementinGovernors for Steam-Engines, of which the following is a specification.

My invention relates to an improved construction of governors for steamengines, whereby a praeticallyconstant speed is maintained, notwithstanding considerable variation either in the load on the engine or in the pressure of the steam.

The invention consists, mainly, in actuating, by means of the sleeve of an ordinary centrifugal governor, alever carrying ascrew-spindle, on which is a screw nut that is connected either to the throttle-valve or to the trip-gear or other expansiongear of the engine, which screw spindle, by means of suitable gear, receives rotary motion in one direction or the other from the rotation of the governor-sleeve whenever the speed of the engine falls below or rises above the normal, so that at the same time that the said lever is directly moved by the vertical motion of the governor-sleeve, so as to actuate the throttle-valve or expansiongear, the nut on the screw-spindle is shifted relatively to the lever, so as to considerably increase its action.

The above-described mechanism may be variously arranged for carrying out the object of my invention. I will proceed to describe several arrangements with reference to the accompanying drawings.

Figure 1 shows a front elevation of one arrangement. Fig. 2 shows aside view, and Fig. 3 a sectional plan.

On the spindle A, carried by the bracket B of the governorpedestal, is fixed, first, the forked lever O, that is pivoted to the governor-sleeve, and, secondly, the lever D, carrying the screwed spindle E, capable of revolving in bearings thereon. The screwed spindle has upon it ascrewed nut, F, towhich is pivoted the rod G, that actuates the throttle-valve or trip-gear or other expansion-gear, and on its upper end is fixed a worm-wheel, H, gearing with a worm, 1,011 a spindle, J,

(No model.) Patented in England January 1, 1886, No. 44.

carried by a lever, K. This lever is mounted loose on the spindle A, and carries at one end a roller, L, situated between the flanges M M on the governor-sleeve, there being a small amount of play between the roller and flanges. The axis of the roller L has a worm, N, gear ing with a worm-wheel, O, on the other end of the spindle J. The lever K has a counterweight, P, at its other end, to balance the weight of the roller L, and it is held in the middle position, shown by means of a spring, Q, attached to the bracket B and bearing on its under side.

Assuming the position of the governorsleeve shown on the drawings to be that corresponding to the normal speed of the engine, it will be seen that when in that position its flanges are not in contact with the roller L, and consequently,the latter not being rotated thereby, no motion is imparted to the screwspindle E. \Vhen, however, the speed of the engine drops, the governor-sleeve, in dropping, will bring its upper flange into frictional contact with the disk, and will cause this to revolve, so that at the same time that the lever D is moved toward or into the position D by the lever O, thereby actuating the throttlevalve or expansion-gear so as to admit more steam, the screwspindle is also rotated, so as to cause the nut F to travel toward its lower end, and by thus effecting a greater backward mot-ion of the nut F and rod G than would be the case if the rod were pivoted to a fixed point on the lever, a corresponding increased action of the governor on the throttle-valve or expansion-gear will be effected. On the speed of the engine increasing again the motion imparted to thescrewspinnle will still continue in the same direction,-although the lever D will be moved back toward its middle position by the rise of the governorsleeve, and consequently the downward motion of the nut F will continue until the governor-sleeve has again arrived at its normal position shown, whereupon the contact of the flange M with the roller L will cease, and the nut F will then remain in the position into which it has been moved until it is again shifted by a change of speed of the engine.

When the speed of the engine rises above the normal, the governor-sleeve in rising above the middle position will effect the rotation of the spindle E in the contrary direction to that described, so that at the same time that the lever D is moved toward the position D the nut F will be screwed upward, and cgnsequently will also to a certain extent increase the forwardmotion of rod G, and therefore also its action on the valve-gear. When the speed of the engine has risen to such an extent as to bring the lever into the position D in which it stands at right angles to the rod G, it will be seen that the upward movement of the nut will have no effect in varying the position of the valve-gear. The screw-thread is stopped short at some distance from each end of the spindle E, so that the continued rotation thereof when the nut has reached its extreme position in either direction, will only cause the nut to run off the screw, and thus prevent any damage to the mechanism. On the spindle being rotated in the contrary direction, owing to a change of speed, the nut will re-euter the screw-thread of the spindle, being aided in this, when inthe bottom position, by aspring, R, pressing it upward.

The rod G is generally of such a length between the governor and the valve'gear that the angling thereof in theextreine positions of the nut will practically not affect the abovedescribed action; but in cases where the rod would have to be of comparatively short length any effects of its angular position may be avoided by forming the lever D with a curved slot in which the nut F would slide, and by leaving the lower end of the screwspindle free, with its upper end carried in a pivoted or ball-and-socket bearing. Thus thecurvature of the slot would cause the nut when being screwed up or down to have its position varied so as to compensate for the angular position of the rod G. Fig. 10 shows such an arrangement, the curvature of the slot D, in which the nut F works, being made as an are having a radius equal to the length of theoonnecting-rod G. The position of the frictionroller L upon its axis may be made adjustable by means of a screwor other device, so that by shifting it nearer to or farther from the axis .of the governor-spindle the relation between the speed of rotation of the governor and that of the screw-spindle may be varied.

Figs. 4and 5 show an elevation and section of a modification in which the lever D and screw-spindle E are arranged horizontally, the rod G for actuating the valve-gear being directed upward. The rotary motion is imparted to the screw-spindle E from the roller L through spindle J, worm I, worm-wheel H on spindle A, and worm and worm-wheel H and I, the lever 0 being mounted with its boss loose on the spindle A, and being connected rigidly with lever D. I 6 The several parts are otherwise of the same B, in which is a spring, Q, holding the roller .rangement at'Fig. 6 as applied to a throttleconstruction as above described, and are indicated by the same letters of reference.

In the modification shown at Figs. 6 and 7 the lever K, carrying the friction-roller L, is cranked, so as to bring the axis of the roller into a position with its worm N, in gear'with a worm-wheel, O, on the spindle A, which in this case is rotatable in its bearings on the bracket 13, and carries a bevel-pinion, S, gearing with a bevel-wheel, T, on the screw-spindle E. 'Thelever 0, connected to the governorsleeve, in this case works loose on the spindle A, and has its one limb fixed to or formed in one with the boss of the lever D, which also works loose on A. Figs. 8 and 9 show a modification of this arrangement, in which the friction-roller L is carried by a bracket, K, in place of a lever, the bracket having a stem, K, sliding in a socket, B, in the bracket 8 in the middle position. The axis of the 5 roller imparts motion by bevel-gearing U V to an axis, WV, also carried by the bracket K, and which imparts motion by bevel-gearing X Y to the spindle A, having a worm, Z, in gear with the worm-wheel H on the screwspindle E. Fig. 11 shows the first-described arrangement of the apparatus as applied to the trip-gear of known construction for expansion-valves, and Fig. 12 shows the arvalve. I

' Fig. 13 shows an elevation, and Fig. 14: a plan, of an arrangement in which the lever D and screw-spindleE are arranged as an intermediate gear separate from the governor, which in this case is made to actuate the lever D through the levers and rods e e e 6 while the screw-spindle is actuated by a separate sleeve, with flanges M M on the lower end of the governor-spindle, the friction-roller L being carried by a lever, K, with balanceweight I, as before; but the motion of the roller is imparted to the screw-spindle through a pulley, a, on: the axis of the roller L, and endless cord-b, passing over a pulley, c, the axis of which drives the screw-spindle by bevel-gear cl.

Having thus described the nature of my invention and the best means I know for carrying the same into practical effect, I claim- 1. In combination with the sliding sleeve of a governor, a lever carrying a screw-spindle, which is rotated in one direction or the other by afriction-roller situated between two flanges 1 20 on the governor-sleeve, so that a screw-nut upon the'said-spindle connected to the valvegear of the steam engine, in being moved up or down upon the screwspind-le at the same time that the lever is moved by the governor, {25 effects an increased action upon the valvegear, substantially as herein described.

2. The combination, with the governorsleeve provided with flanges M M, of the friction-roller L, carried by lever or bracketK, :3

subscribing witnesses, this 15th day of June, IO A. D. 1886.

ROBERT MATTHEWS.

W'itnesses:

ARTHUR B. COWLEY,

Hyde. G. T. BILLINGS,

Godley.