US695445A - Valve-gear. - Google Patents

Description

Patented Mar. [8, |902.

H. DAMERELL.

VALVE GEAR.

(Application med Aug. 27, 1901.

(No Modal.)

y UNITED STATES PATENT OEEICE.l

HENRY DAMERELL, OF RACINE, WISCONSIN, ASSIGNOR OF AONE-IIALFTO FRANK WAY, OF OHILLIOOTI-IE, MISSOURI.

VALVE-GEAR.

SPECIFICATION'forming part of Letters Patent No. 695,445, dated March 18, 1902. Application filed August 27, 1901. Serial No. 73,455. (No model.)

vTo @ZZ whom t may concern:

Be it known that I, HENRY DAMERELL,a citizen of the United States, residing at Racine, in the county of Racine and State of Wisconsin, have invented a new and useful Improvement in Valve-Gear, of which the following is a specification. 1.L

My invention relates to certaihdmprovements in valve-gear for steam-engines, and has for its object to effectively regulate a supply of steam to a reversible engine by varying the point of cut off, the governor being so larranged and connected to the valve-operating mechanism as to `tend to move such mechanism from either extreme of position to a central position.v y

A further object of the invention is to effect the governing of the engine without reducing the volume or pressure of steam in the steam-chest and without wire-drawing, thev throttle being at all times wide open.` V A A still further object of my inventionis to regulate the sensitiveness of the governor, so as to prevent hunting.

With these and other objects in view the invention consists in the improved governing device,- hereinafter more fully described, and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a side elevation,- partly in section, of a governor constructed and arranged in accordance with my invention; and Fig. 2 is an end elevation of a portion of the same.

In the drawings similar numerals of reference indicate corresponding parts in both of the figures.

1 designates a bell-crank lever connected to any suitable form of reversing mechanismsuch, for instance, as the ordinary and wellknown link, the movement of which will effect arreversal ofthe steam-valve. The upper end of this lever has two extremes of movement, as indicated in full lines at-2 and by dotted lines at 3, and the movement from either position toward a central or mid position causing an earlier cut off of the steam and reducing the quantity of steam supplied to the cylinder. The position 2 indicates the full-open position with the engine running forward and the block :at one end or corner of the link, and the dotted-line position 3 represents the opposite extreme of movement with the engine reversed or running backward. To operate this reversing mechanism, I employ the usual reversing-lever 4., vhaving a latch 5, which may be locked in any one of three positions ou the usual notched bar, the lever being connected by a series of suitable intervening rods to the bell-crank lever 1. v

7 indicates a suitable frame, in which `is journaled a horizontal shaft 8, driven by any suitable intervening mechanism, usually a lbelt and pulley-wheels, from the main shaft of the engine. On this shaft 8 issecured a beveled gear 9', the teeth of which intermesh with the similar teeth of a beveled .gear 10, secured to thelower end of a sleeve 11, journaled inthe frame and connected by bolts or set-screws 12 to arevoluble frame 13,'having radially-projected arms 14. In the upper and outer ends of the armsle are pivoted bellcrank. levers'l, the vertical arms of which are provided with the usual weights 16, the latter being connected to each other bya controlling device in the form of va helicallycoiled tension-spring.17,which normallyvholds 19 and 20 and suitable ball-bearings 21 22 be- Y ing placed between the three collars to reduc the friction to a minimum.

The upper and lower collars 1-9 and 2O are keyed or secured by suitable pins 23 to a vertical rod 24, the movements of which .are transmitted to the bell-crank lever l and effectv the movement of thelatter in a direction tending toward the mid-position from either extreme of movement.

Journaled in suitable bearings 24C' in the frame 7 is a horizontal shaft 25, secured at one end to an arm 26, the outer or lower end of which is pivotally connected to the lower end of the vertical rod 2l. Coiled around the shaft is a torsion-spring 27, one end of which is secured to the shaft and the opposite end to a ratchet-wheel 2S, journaled loosely on the shaft and adapted to be operated by a wrench which may be placed on an angular extension 29 of the ratchet, any backward movement of the ratchet-wheel being prevented by a locking-pawl 3l, pivoted to the frame and engaging with the teeth of the ratchet-wheel, as shown by dotted lines in Fig. l. The turning of the ratchetwheel will cause a winding up or tightening of the spring, increasing its torsional strain and tending to depress the arm 26 and the vertical rod 24 and to some extent resist the operation of the governor. This adjustment is delicate, but is effective in preventing hunting and will enable the governor to more readily restablish its equilibrium after any sudden movement of the valve.

Pivoted to the frame of the machine ou a stud 3l is a bell-crank lever 32, the shorter arm of which is connected by a link 33 of any suitable length to the reversing-lever 4C and the longer arm of the lever being connected by a link 34; to a second link 35, the opposite end of which is pivoted on a stud 3G, near the juncture of the arm 26 and the vertical rod 2a. From the pivot-point of the links 34k and 35 there extends a rod 37, connected to the upperend of the bell-crank lever 1.

The operation of the device is as follows: Assuming the parts to be in the position illustrated in full lines in the drawings, any upward movement of the vertical rod 24 under the influence of the governor will cause a corresponding upward movement of the arm 2G and link 35, the latter being drawn slightly in the direction of the vertical rod 24 and tending to move the bell-crank lever l,through the rod 37, in the direction indicated by the arrowthat is to say, from the full-open position 2 to the central or closed position at a point midway between the two limits of movement. This movement will be transmitted to the link and through the latter to the valve, causing the valve to cut off at an earlier point in the stroke, reducing the volume of steam supplied to the cylinderand in a measure reducing the speed of the engine. When the lever 4f is moved to the dotted-line position, it will effect a corresponding movement of all the various parts, including the bellcrank lever l, to the position shown by dotted lines, the lilik being then in the opposite position, the valve full open, andthe engine reversed or running backward. Any upward movement of the vertical rod 24 under the influence of the governor will then tend to raise arm 2G and, through the link 35, force the rod 37 away from the vertical rod and cause thc bell-crank lever l to travel from thc position 3 toward the position 2, the eiiect on the link and valve being the same, but in the reverse direction, as previously described.

On the shaft 25 is secured a lever 30, which may be used as a hand-lever to operate the governor in adjusting or to be tied downto prevent the action of the governor when high speed is desired.

The device may be modified in a variety of ways as may be necessary in adapting it for use in connection with any suitable reversing-gears, and it will be understood thatI do not wish to limit myself to the application of the device to the link reversing-gear or to any other particular type, the arrangement being adapted for use in connection with any reversing-gear having two full-open positions.

Having thus described my invention, what I claim is- 1. In a device of the class speciied, a governor, a longitudinally-movable rod operatively connected thereto, an arm pivotally connected at one end to the rod and at the opposite end to a fixed fulcrum, a reversing mechanism, a rod and link pivoted together and connected respectively to the reversing 'mechanism and the said pivoted arm, a reand a series of jointed levers connected toI the reversing-lever, the reversing mechanism and the arm 26, substantially as specified.

3. The combination with a reversing mechanism, of a governor, a fnlcrumed arm adapted to be operated by said governor, connections between said arm and said reversing mechanism and means for adjusting said connections to opposite sides of the fulcrum of said arm, whereby the movement in one direction of said arm may be transmitted in the reverse direction to said reversing mechanism, substantially as specified.

At. The combination with a reversing mechanism, of an operating-lever, a governor, a fulcrumed arm 26 operatively connected to said governor, abell-crank lever 32 fnlcrumcd to a fixed point and having one of its arms connected to the operating-lever, and a scries of links connecting the opposite end of said bell-crank lever to the ar 26 and to the reversing mechanism, substantially as specified.

5. The combination with a reversing mechanism, of a reversing-lever, a governing device, a vertically-operated rod 24 connected to the governor, a lever 26 fulcrumed to a iixed point and connected at one end to the rod 24v, a bell-crank lever 32, a link con- 'neoting one arm to the bell-crank lever to the myown I have hereto afxedmy signature in reversing-lever, links 34 and 35 connecting the presence of two Witnesses. the opposite end of the bell-drank leverl to the arm 26, and a, rod 37 extending from the june- 5 ture of the links 34 and 35 to the reversing Witnesses: mechanism, substantially as specified. MARTIN .LI-IENDERSON, In testimony that I olziim the foregoing as JAMES GRAHAM KIDDLE, J1'.

HENRY DAMERE'LL,

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