US240756A - o neill - Google Patents

Description

(No Mddel.) A 2 Sheets-Sheet 1.

E. ONBILL.

Valve Motion Gut-off.

No. 240,756. 7 Patented April 26,1881.

Witnees es N PEI'ERS, PHOTO-LITHOGRAPNER. WASHINGTON. D. G.

No M d l. ZSheets-Sheet 2. 6 E. ONEILL.

Valve Motion Out-off. No. 240,756. Pat ented April 26,1881.

Witnesses N. PETERS. FHOTOLITHOG RAPHER, WASHINGTON, D C.

UNITED STATES ATENT V FFICE.

VALVE-MOTION CUT-OFF.

SPECIFICATION forming part of Letters Patent No. 240,756, dated April 26, 1881.

Application filed September 27, 1880. (No model.)

California, have invented an Improvement in Valve-Motion Out-Offs; and I hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to certain improvements in valve-motion and cut-off mechanism for engines; and my present improvements are more especially applicable to a former invention for which Letters Patent were issued to me May 25, 1880, and numbered 227,918.

My present invention relates to the intermediate mechanism which is connected with the governor, and which regulates the movements of the rocker-arm and the trip mechanism of the valves.

It consists of a pair of diagonally-crossed levers, the lower ends of which are pivoted to a horizontally-reciprocating slide operated by a crank or eccentric from the main shaft of the engine, while the upper ends are suspended by links from the vertically-moving sleeve on the governor-spindle, by the action of which they are raised or depressed, and at the same time drawn together or separated. The upper ends of these levers are also united by connecting-rods and crank-arms with the rock'shafts, and while actuating them they also regulate the trip mechanism and the closing of the valves.

Figure l is a side elevation of an enginecylinder, valve-chests, and valve-operating mechanism with my improved attachment. Fig. 2 is an end view of the same. Fig. 3 is a section of the case.

A is the cylinder; B and O, the steam and exhaust valve chests at each end of the cylinder; D, the rocking cams or arms by which the valves are lifted. E F is the tripping mechanism by which the steam-valves are released from the lifter and allowed to close, and G Gr are the connecting-rods by which this mechanism is actuated, these parts and their operation being fully shown and described in my former patent.

In my present invention, H is a slide, which is caused to reciprocate horizontally within a suitable guide by an eccentric upon the crankshaft by means of the rod I. At opposite ends the tripping-gear.

of this slide two arms, J, are pivoted, and extend diagonally upward, so as to cross each other, as shown. The upper ends of these crossed arms are suspended from the sliding sleeve or collar K on the vertical governorspindle L by the arms or rods M. From the upper ends, N, of the arms J, to which the rods M are jointed, the rods 0 connect with the rocker-arms P, by which the tripping devices for the valves are operated.

It will be seen that when the governor runs rapidly the ring K will be drawn up, and the rods M will draw the ends N of the diagonal arms J up with them. As these ends are drawn up they approach each other, andthrough the rods 0 they move the rocker-arms P, so as to adjust the tripping mechanism to allow the valves to close sooner. When the governor runs more slowly, the ring K, rods M, and arms J descend, and the upper ends, N, of the arms are separated, thus reversing the action of the tripping mechanism and allowing the valves to remain open longer. By this constructlon the arms J swing easily about their pivots upon the slide H, and their vertical adjustment is made with little or no friction, While a lateral movement is imparted to them by the slide, and is communicated by them to It will be seen that the same effect may be produced without crossing the arms J.

Any suitable form of governor may be employed. In the present case I have shown the arms connecting the governor-bal1s with the head, and the sliding collar K as being crossed.

In-order to regulate the action of the governor, I employ a vase or receptacle, R, which is adapted to contain small shot. The quantity of shot may be regulated at will, and the motion of the governor thus adjusted to a nicety by the'action of the weight.

I am aware that heretofore in a similar device a receptacle like my receptacle R has been used to contain mercury to weight the governor, and such weight could be made variable by removing a portion of the mercury or adding to it; but the high temperature of engine-rooms and the highly-volatile character of the mercury render it very unstable for the purpose of making a variable weight.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-- 1. The arms J, having their lower ends pivoted to the slide H and approaching or crossin g each other diagonally, their upper ends being connected with the ring or sleeve K of the governor, and with the valve-trippin g mechanism by the rods O, substantially as and for the 10 purpose herein described.

supported by the arms of the governor, in combination with the contained shot or other divided removable solid heavy material by r 5 which the action is adjusted and regulated, as described.

In Witness whereof I have hereunto set my hand.

EUGENE ON El LL.

Witnesses:

S. H. N OURSE, FRANK A. BROOKS.

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