US117570A - Improvement in valve-gears of pumping-engines - Google Patents

Description

UNrTED STATES PATENT OFFICE.

IMPROVEMENT IN VALVE-GEARS OF PUMPlNG-ENGINES.

Specification forming part of Letters Patent No. 117,570, dated August 1, 1871.

To all whom it may concern:

Be it known that I, HORACE SEE, of Pottsville, in the county of Schuylkill and State of Pennsylvania have invented certain Improvements in the Valve-Gear of Pumping-Engines, of which the following is a specification:

My invention applies to that class of engines which employs a rod moving coincident with the piston to operate the valve-gear; and relates: First, to the combination ofthe tappet-arms, rockshafts, and valve-rods, in such a manner that the latter make a direct connection between the valvestems and rock-shafts. Second, to the combination of the tappet-arm, quadrant, and dash-pot arm in one piece. Third, to the combination of the quadrant and dash-pot arm in one piece.

Fig. 1 is a front view of a vertical, single-acting, non-condensing engine, to which my invention is applied, with a portion of the plug-rod broken away. Fig. 2 is a plan of the same. Fig. 3 is a side view looking in the direction of theA arrow l with the dash-pots in section. Fig. 4L is a detached side view of the valve-gear looking in the direction of the arrow 2. Fig. 5 is a detached sectional side view of the valvegear looking in the direction of the arrow 1. Fig. Gis a front view of the valve-gear applied to a vertical, single-acting, condensing-engine, with the plug-rod removed 5 also, the bearing-caps taken ofi'. Fig. 7 is a detached sectional side View of the same, looking in the direction of the arrow 3.

A is the steam-cylinder resting on an d secured to the girders P and l for connecting it with the foundation. B is the steam-chest connected to and communicating with the bottom of the cylinder A by the pipe O; also, communicating with the top through the pipe N. Steam is admitted to the chest through the nozzle j', and ex` hausted through g; C is a piston-rod extending above, through a stuffing-box, into the cylinder A, and secured to a piston which has not been shown. D is a cross-head with an extension below for operating the pump. The plug-rod E for operating the valves is worked from this crosshead and guided on the steam-chest B. F is a stem connected to the steam-valve, and G one connected to the exhaust. Neither of these valves is shown, as there is nothing novel in their construction. His the steam, and I the exhausttappet, both being secured to the plug-rod E. F2 is the steam, and G2 the exhaust rock-shaft. F2

is the steam, and G3 the 'exhaust tappeti-arm, with a handle on one side and at the end of each for working by hand. These are, respectively, secured to the rock-shafts F2 and G2. The arm F3has the quadrant F4 incorporated with it. G4 is the exhaust-quadrant, secured to the rock-shaft G2. M and M are bearings carrying the rock-shafts F2 and G2, and secured to the pipe N. F1 is a rod connecting the valve-stem F with the rock-shaft F2. The rod G1 also connects the stem G with the rock-shaftJ G2, the connection of these rods with the shafts being made by pins placed out of center on an enlargement at one end. K is the steam, and L the exhaust dash-pot plunger, working, respectively, in the pots K and L', which are joined together and secured to the pipe N. The plunger K is connected to the arm F3 by the rod k, and the plunger L to the quadrant G4 by the rod l, the pins for making the connection being placed out far enough to obtain the necessary leverage. The drawing represents the piston and plug-rods as moving up, the steam-valve being open and the exhaust closed. The double-beat Cornish valve, on account of its being very nearly balanced, is generally used. The steam-valve is kept op en by the weight ofthe dash-pot plunger K. The weight of the dash-pot plunger Lis prevented from opening the exhaust-valve by the steamquadrant F4 holding the exhaust-quadrant G4. The steam-tappet H will, by the plug-rod E moving up, strike the steam-tappet arm F3, turning the rock-shaft F2, whichwill closethe steam-valve through the rod Fl and stem F 5 also, moving the steam-quadrant F4 clear of the exhaust-quadrant G4. The exhaust-quadrant G4, now being' free, is moved by the weight of the dash-pot plunger L, turning, at the same time, the rock-shaft G2, which opens the exhaust-valve throughv the rod G1 and stem G; also, throwing up the exhaust tappet-arm G3. The exhaust-valve being open, the rods G and E will descend, and before the end of the stroke the tappet I will strike the arm G3, turning, at the same time, the shaft G2, which will close the valve through the rod Gl and stem G; also, move the quadrantG4 clear of the quadrant F4, and allow the plunger K to depress the arm F2, turning the rock-shaft F2 and raising the rod F1 with the stem F attached, opening by this operation the steam-valve. The piston will again ascend, from which will follow the same movements. It may be more convenient in the manufacture to make the quadrant F4 solid with the rockshaft F2 and afterward join the arm to them; also, to make the quadrant G4 solid with the rock-shaft G2. Figs. 6 and 7 show my invention applied to a condensing-en gine, where the steam, exhaust, and equilibrium-Valves are in one chest. Q is the equilibrium valve-stem, which is attached to a Valve that allows the steam, after the piston has completed the up-stroke, to pass around to the top of the piston. Ql is the equilibrium Valve-rod connecting the stem Q with a projection on the tappet-arm Q3. Q2 is the equilibrium rock-shaft. QG is an arm on one end of the shaft Q2, and Vconnected Yby theYV rod rowith the equilibrium dash-pot plunger. Q5 is a handle incorporated with the arm Q'3 for working` the equilibrium-Valve byhand. Q4 is the equilibriumquadrant, which works with the exhaust quadrant and is secured to the shaft Q2. The exhaust tappet-arrn and quadrant are in one piece. No

quadrant is used on the steam-shaft F2, the opening of the steam as well as the exhaust-valve being regulated by a cataract, which, on account of its being well known, has not been shown. The

exhaust-valve is closed by the plug-rod near the end of its up-stroke. At the same time, the equilibrium-quadrant Q4 being freed, the weight ofthe dash-pot plunger opens the equilibrium-valve. The equilibrium-valve is closed by a tappet on the back of the plug-rod during its down-stroke striking the arm Q3.

In the figures the steam and exhaust-valves are supposed to be open and the equilibrium closed.

I do not claim the use of the tappet-arins, quadrants, rock-shafts, or dash-pot arms separately.

I claim as my inventionl l. The combination of the tappet-arin, rockshaftFand Valve-rod, substantially asrand for the purpose hereinbefore set forth.

2. The combination of the tappet-arm, quadrant, and dash-pot arm, substantially as set forth.

3. The combination of the quadrant and dashpot arm, substantially as set forth.

HORACE SEE.

Witnesses:

F. C. CAMPBELL, N. O. DAYTON.

Images