US303711A - Governor for engines - Google Patents

Description

(No Model.)

D. P. DAVIS.

GOVERNOR FOR ENGINES.

No. 303,711. Patented Aug. 19, 1884.-

UNITED STATES PATENT OEEicE.

DAVID l DAVIS, OF JERSEY CITY, NElV JERSEY.

GOVERNOR FOR ENGINES.

SPECIFICATION forming part; of Letters Patent No. 303,711, dated August 19, 1884.

Application filed April 8, l8P4. (No model.)

To all, whom it away COILOBIIL:

Be it known that I, DAVID P. DAVIS, of tric may Jersey City, in the county of Hudson and State of New Jersey, have invented an Improvement in Governors for Engines, of which the following is a specification.

Governors for steam-engines have been made to act upon the eccentric and move the same so as to change the position of the center of the eccentric in its relation to the axis of the shaft, and lessen the throw of the valve when the speed of the engine increases, and the re verse. In these cases difficulty has arisen in holding the eccentric with sufficient rigidity to prevent the eccentric itself being displaced, owing to the friction of the valve upon its seat.

My present invention relates to the combi nation, with the main shaft and the eccentric, of a pivoted arm supporting the eccentric, and a secondary eccentric acted upon by the governor balls and levers, so that the secondary eccentric is moved by the governor, and the main eccentric is shifted by the action of the secondary eccentric upon the pivoted arm. By this construction the governor is enabled .to turn and to hold the secondary eccentric,

and this acting upon the pivoted arm of the main eccentric can move the latter with facility; but there is no risk of the main eccen- U .tric becoming displaced by the friction of the engine-valve, because the secondary eccentric holds the parts in a very firm manner.

In the drawings, Figurel is an elevation of the wheel and parts connected with the eccentric. Fig. 2 is a sectional plan of the same, and Fig. 3 is an elevation of a slight modification in the positions of the parts.

The shaft A is usually provided with the crank to which the connecting-rod of the engine is applied. Upon this shaft A there is a wheel or arms for the pivots 0d e. The pivots c d connect the arms F G of the governor. Upon these arms are the balls or weights H, which are adjustable, and there is a spring, K, acting in the reverse direction to the centrifugal force of the governor. The arms or levers F G may be placed in any convenient position in relation to each other and to the parts that are moved by them.

The main eccentric L is provided with an arm, L, which extends to the pivot-bolt e, and the eccentrichas an elongated opening through which the shaft A passes, so that said eccen be swung, with its arm L, upon the pivot c. The ecceniric-rod passes from the cccentric to the engine-valve in any well-known manner; and it is to be understood that the parts are to be proportioned,so that when the center of the eccentric L is nearest to the center ofthe shaft A the minimum amount of motion will be given to the valve, and that the motion of the eugine-valve will be increased as the main eccentric L- is swung in either di rection, so as to increase the distance between the center of the eccentric and the center 01' the shaft A. Then the valve receives its minimum motion, but little steam is introduced; but as the motion of the valve is augmented the power of the engine will be increased;

hence it is only necessary to move the eccen-' tric to the proper position to maintain uniformity of speed, or nearly so.

The secondary eccentric N is upon an axis, 0, to which the cross-arms P are connected, and from these arms there are links q, extending to the levers F and G of the governor; and the parts are placed so that the secondary eccentric is turned as the governor-balls are thrown out by the centrifugal action. The secondary eccentric N acts upon the arm L of the main eccentric by being placed within a slotin such arm, as in Figs. 1 and 2, or else by a strap around the eccentric and link 0, pivoted at its end to the said arm L, as in Fig. 3, so that the main eccentric will be moved laterally by the governor, acting through the secondary eccentric, and such secondary eccentric forms a rigid support intervening between the arm of the main eccentric and the governor; hence the resistance or friction of the arm L of the main eccentric L, so as to form a parallel'sided space for the box 0, into which box the secondary eccentric N passes, so that the box will slide between the bars 10 as the eccentric N is turned, thereby giving the proper extent of-bearingsurface and preventing looseness in the parts. The spring K is adjustable in its tension by the screws 8, ap-

plied at either or both ends, between the spring and lever, and the points of connection of the spring can be changed so as to be nearer to or farther from the fulcra. It is preferable to employturn-buckle links at the ends of the spring, with right and left hand screw-threads and set-nuts, so that by loosening the set-nuts the spring and the parts of the turn-buckles connected therewith can be revolved to vary the tension of the spring, after which the set nuts are clamped to hold the parts from turning. By applying only one spring it acts equally on both levers, and the speed can be regulated simply by varying the tension of the spring. The slot at t in the eccentric receives the serew-boltt that passes into one of the arms of the wheel, so as to prevent the eccen trio becoming misplaced laterally. It is to be understood that the fulcrum c for the lever arm of the main eccentricL may beplaced between such eccentric L and the end of the said leverarm, so that the secondary eccentric may act upon the end ofthe arm instead of in the position represented. By changing the relative positions of the secondary eccentric to the lever-arms F G the said secondary eccentric can be made to move the main eccentricin the opposite direction to that represented by the drawings, so as to change the lead of the en ginevalve, and cause the engine to revolvein the opposite direction.

I claim as my invention 1. The main eccentric, the arm carrying the same, and the fixed pivot upon one arm of the wheel, in combination with a secondary eccentric, a pivot for the same upon one of the arms of the wheel, a cross-bar for the second the governor-levers, and the connection to such main eccentric, of one adjustable spring extending from one lever of the governor-to the other,

and connected to such levers at equal distancesfrom their pivots, substantially as set forth.

4. The main eccentric and the pivoted arm by which it is supported, in combination with the secondary eccentric, the box of such eccentric, the bars upon the eccentric-arm, between which the eccentric-box is received, and the governor and connections for-moving such sec ondary eccentric, substantially as set forth.

Signed by me this 7th day ofApril, A.D.1S8l.

DAVID I. DAVIS.

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