US115301A - Improvement in steam-engines - Google Patents

Description

2 Shseis--SheeLL 'Patented May.. 30,1871.

l'. W FORBES lmpovemant in Steam Engines.

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IsAAo- WILLIAM FORBEs, OE LA PORTE, INDIANA.

" lMPRovEMENT IN STEAM-ENGINES.

Specification forming part o f Letters Patent No. 115,301, dated May 30, 1871.

. `To allwhom it mycooweru:`

\ `Be it known that I, IsAAc WILLIAM FORBES,

` of LaPorte, inthe county of La Porte and State of Indiana, have invented certain Improvements in Steam-Engines, of which the following is a specification:v

The objectof the invention is to produce a steam-engine by means of which a variable stroke of the piston-rod may be had, ifrequired, at least in one direction. Such engines are used more especially in direct-acting quartzthevalve out at that line whilethis has it in.

Fig. 2 is a cross-section of the same cylinders,

las `viewed from `the top,"at dotted line a a in Fig. 5, with `everything removed out of the valve-seat. y Fig. 3is`a cross-sectional view of the same cylinders, as viewed from the top, at dotted line c c -in Fig. 5, with everything removed out ofthe cylinders and valve-chamber. Fig. 4 shows the cylinders and heads apart, ready for being bolted together, lookingat them internally` when-separated at the dotted Fig. 5 is a longitudinal central sectional view of this improved steamengine when used as fa stamp-battery with a portion Vof `the `frame `and the stamp-stems broken off, with the guide-plate through which the stamp-stems pass, with water-chamber un- `der .the stand of the valve-stem for conveying water around eachstamp below thestufli 11g-box and bearingoffthestamp-stems, aportion ofthe valve-stem and the valve `being removed from the valve-chamber, the induction-ports and differsfroni that shown in'Fig. 5, and may be used instead. Fig. 6is a full front view ofthe engine with a portionyof each sidelof the frame torn out, and the lower portion of the frame piston-rods and valve-stems broken oli". Fig. is a top view of 4the upper end of Fig. 6. Fig.

8 is a side view of Fig. 6 with a portion of the frame torn out vand the lower end broken olf. Fig. 9 is a bottom view of the lower head or heads of the cylinders when made in two pieces. Fig.`10 is a cross-section,'showing the method of coring out the cylinders so as to exhaust throughI the lower head, or it may pass around one cylinder and then pass off. The sectional surface in. this figure is' `shown by dotted linee e in Fig. 11. Fig. 11 is a longitudinal central sectional view of Fig. l0 with a portionof the frame attached, the lower portion being broken Oi'. Fig. 12 is a longitudinal central section of the same engine, excepting in the method of taking in steam, and a slight variation in the valve-frame,v and thedepth ofthe hole in the stem through which steam `passes from the feed-pipe to the valve. In this case` steam is taken in through the flange of the lower head (which is castl together) of the valve-stem between the double stuffing-boxes.

This method is preferable to that described in previous figures.

General Description.

A A are cylinders. B B are valves. C is the valve-frame. Y Steam is received in the stem or frame of this fourfold valve and passes through the center of each valve-piece to its proper port, as the openin gs through the valves pass over the respective ports. D D and D2 D2 are companion-ports. D D lead to the upper end of'cylinder A. D2 D2 lead, at the same time, to the lower end of cylinder A A'. Steam being takenin at the upper end of cylinder A and the lower end of cylinder A', it will move the piston of cylinder A down at the same time that the piston of cylinder Al D1 D1 leading to the lower end of cylinder A,

while D3 D3 lead to the upper end of cylinder A and vreverses the motion of pistons; hence one piston is always being driven up while the other is being driven down? To make this more complete when used as an automatic direct-acting qu artz-battery the steam-passage through the valve had better be on one side Enr EEICE.

of the center, next to the ports leading to the upper end of each cylinder. E E are exhaustpipes. E1 is an induction steam-pipe. E2 E2 are exhaust-ports. F F is the thimble in the upper end of the valve, fitting the valve-chamber and the valvestem; also, through which steam passes, through the induction steampipe, into the valve-stem and frame. F1 F1 is taper thimble iitting in the hole bored out in the upper head to receive it. F2 is taper thimble iitting in the lower end of the valve-chamber at the lower end of the cylinder, and which is also designed as a bearing for the valvestem. As it wears it may be raised up by a set-screw or washer, Src., slipped under, which will take up lost motion and form a complete bearing. G is a taper plug designed to fit in the upper end of the valvestem, screwed down with an oil-cup in the top, through which the cylinders are oiled, and which also lits the taper thimble to forni an upper bearing for the upper portion of the valve-stem, designed to screw down as it wears and take up lost motion. H H are pieces dressed up to form a steam-tight joint in their center, with groove and tongue upon one side, holding them in position while being bored out for stufngboxes, and itting their piston-rods, and turned oi at the upper end for iitting the lower portion of the piston and the piston-rod, and filling the recess in the lower end of the engine, and turned ori' on the outside to fill the holes which are bored out 'through the lower heads to receive them. They are driven in their position after the piston-rods are passed through the heads, forming a complete `joint as though the head were of one piece, or they may be screwed in. Holes are drilled in the joints between these pieces and the iianges in which they are driven for receiving the studs of the glands of the stuffing-boxes. I is the valve-stein. J J are inclines or swells on the piston-rods and sta-mpstems. K K is the frame. L L, center plates or frame-work bolted to the frame, to which bearings are connected through which stamp-stems pass; M M, bearings, with glands and stufiing-boxes, their bearings being in the glands, with waterchambers below for conveying water through the channels around the stamp-stems for keeping the same clean and supplying the battery below with water when wet crushing is required. W'hen dry crushing is required air or steam may be substituted for water. N is a bearing for the lower portion of the valvestem; also, a chamber which receives water for keeping the stamp-stems clean and supplying the battery. O O, the upper head or heads of cylinders. O O', lower head or heads of cylinders. In Fig. 5', L is the guide-plate, varying from that in Fig, 5; P P, water-passages, cored out through the plate which passes through the frame and conveys water around the stamp-stem, and so in the battery; M1 M1, stuffing-boxes and water-chambers, which are driven 'in plate L', and in which glands are screwed for forming the bearing for the stampstems to work in. M2 M2 are glands. M3 M3 are chambers in the lower portion ot' stuiiingboxes, which pass entirely around the stampstem, which convey water around the saine, and keeping it clean while not crushing, or, if dry crushing, air or steam may be used instead of water to keep the dust out ot' the bearing.

When cylinders are cast solid, and it shall be found inconvenient to dress the ports, the valve-seat may be bored out of sufficient area to receive a thimble of sufficient thickness and strength, with ports dressed out to correspond with the valve and ports in the cylinder.

The glands d d are divided in the center so as to be slipped on the piston-rods between the piston and swell, after the piston-rods have been put through the lower heads, when bands d d are shrunk upon the flanges ofthe glands, securely binding them and making them as oi' one piece.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is- I l. 'Ihe ports D to I)3 for receiving and conveyin g steam to their respective cylinders at opposite ends, as described.

2. The pieces H H, in combination with the lower heads O O', substantially as and for the purpose described.

3. The combination of the bearing M1, having a chamber, M3, and a gland, M2, substantially as described.

4. The plate L L and water-passage P P, substantially as set forth.

I. W. FORBES.

Witnesses:

W. H. FINCKEL, W. J. PEYTON.

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