US531286A - woolf - Google Patents

Description

(No M0de1.) 1 v 2 S11ets-Sheet 1. B. J. WOOLF.

. ENGINE. 7

No. 531,286. I Patented Dec. 18, 1894.

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'E. J. WOOLF. ENGINE.

No. 531,286. Patented Dec. 18, 1894.

' Inventor ZVZ iw/esses l B 4 l'lfoi y UNITED STATES PATENT- OFFICE.

ELLIS J. WOOLF, vOF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO THE WOOLF VALVE GEAR COMPANY, OF SAME PLACE.

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SPECIFICATION forming part of Letters Patent, No. 531,286, dated December 18, 1 894. Application filed June 2, 1894. Serial No. 513,240. (No model.)

To all whom it may concern:

Be it known that I, ELLIS J. WOOLF, a citizen of the United States, residing at Minne apolis, in the county of Hennepin andState of Minnesota, have invented certain new and useful Improvements in Engines; and I do hereby declare the following to be a full,clear,

I and exact description of the invention, such 1894, entitled engines.

My present invention has for its object to provide certain further improvements in the classes of engines above referred to, with a view of simplicity and economy of construction and. efficiency of action. v v To these ends, my invention consists of the novel features hereinafter fully described and defined in the claims.

The accompanying drawings illustrate my invention, in which like letters refer to'like parts. Figure 1 is a central vertical longitudinal section,through my preferred form of engine. Fig. 2 is a similar view, showing a modified form of the dividing partition between the two tandem cylinders. 7 I

The high and low pressure cylinder castings 1 and 3 are settandem and'fitted with pistons 3 and 4 connected by a common rod 5, extending through a dividing partition 6, constituting the inner end of each cylinder. The two cylinders have a common valve-seat 7, which is located on the low pressure cylinder." On th'esaid seat 7, is located a twopart or double acting valve 8 within the valvechest 9, and provided with thevalve-rod 10. In respect to the distribution, the valve-seat 7 and the doubleacting-valve 8 are substantially like the preferred form of valve and valve-seat, shown in my above noted pending application, Serial No. 503,047, filed March 9; 1894. The distribution is independent for each (so-operating pair of cylinder ends; and

"the valve travels with the piston, when out 5 5 ting ofi admission to the high pressure ports both as in the said application, Serial No.

503,047. In respect to the valve itself, it is not deemed necessary, for the purposes of this case, to give any further details; but in re- .spect to the seat, it is desirable to distinguish the outer end high pressure port a, the inner end high pressure port a, the low pressure ports I), and the final exhaust port 0. The

said final exhaust port 0 is located centrally of the seat; the low pressure ports b are located on opposite sides of the final exhaust port 0 and are of substantially equal size and length; and the high pressure ports a and a. are located one external of each of the respective low pressure ports b b.

In virtue of the fact, that the two pistons 3 and 4 are connected to the common rod 5, and, of course, move in a common direction, it is necessarythat the outer end of the high and the'outer end of the low should co-operate with each other; and that the inner end of the high and the inner end of the low should co operate with each other. Hence, it is neces-. 'sary that the outer end high pressure port a 'of the valve-seat 7 should connect with the outer end of the high pressure cylinder; and this is accomplished, in my improved construction herein shown, by sectional passages or ports 0!. and a respectively, formed in the cylinder castings, and uniting into a continu ous passage, in thecommon flange joint,which connects the inner ends of the said cylinder castings. The port section a which is formed in the low pressure cylinder casting 2, is formed continuous with the valve-seat port a and clears all the other ports in the valveseat.

The dividing partition 6, which separates the two cylinders is located in the low press- 5 ure cylinder casting 2, coincident with and forming a part of the bridge will dividing Hence, the inner end high pressure port a too of the valve-seat is located entirely within the low pressure cylinder casting 2; and the said port a has continuous therewith a clear ance chamber a, formed byan enlargement of the low pressure cylinder casting, which clearance chamber opens directly into the inner end of the high pressure cylinder. In virtue of the facts above noted, as to the location of the dividing partition, the inner end high pressure port a and the clearance chamber a, it follows that the low pressure cylinder casting 2 is extended beyond the said port a, and clearance chamber a, to form the joint flange uniting the two cylinders and the two sections of the high pressure port passages a a formed in the said castings. The clearance chamber a continuous with the inner end high pressure port 0., serves to compensate for the large clearance in the valve seat high pressure port a, and the passages a. a therefrom, to the outer end of the high pressure cylinder. Otherwise stated, this clearance chamber a is required, in order to compensate for the large clearance at the outer end of the high pressure cylinder incidental to the necessary length of the outer end high pressure port thereto; and with this arrangement, equal volumes may be afiorded on the opposite sides of the high pressure piston 3. As shown, however, the said clearance chamber a is slightly smaller than would be necessary, to afiord the complete compensation, for the space in the passages a a a and the remainder of the necessary clearance, at the inner end, is obtained by recessing the inner face of the high pressure piston 3, as shown at a What has so far been said, applies, in all respects, to the constructions shown in both views of the drawings; but in the form shown in Fig. 1, the dividing partition 6 is made removable, and is held to its seat by set-screws 11, tapped through the joint flange of the high pressure cylinder casting and bearing against the said partition. This removable partition might also be secured in position and be held to its seat by lugs projecting either from the plate or from the joint flange of the high pressure cylinder casting.

In the modification shown in Fig. 2, the dividing partition 6, separating the two cylinders, is shown as formed integral with the low pressure cylinder casting, and as provided with a recess d opening up to the atmosphere, for access to the piston rod packing. For all purposes of operation, the results are the same, so far as the action of the engine is concerned; but the removable partition 6 is an advantage, for affording access to the low pressure cylinder from the high pressure end. In virtue of this and the general construction, it is obvious, that by the removal of the joint flange nuts (not shown), the two cylinder casting may be separated, the partition 6 be removed and access be alforded to all parts of both cylinders; and that, in virtue of the location of the inner end high pressure port a. wholly within the low pressure cylinder cast-j ing, and the relative arrangement of the sectional port passages a a uniting in the joint flange connecting the two cylinder castings, no pipe couplings or uncouplings are required in separating or putting together the two cylinder castings. The set-screws 11 having been once properly set, no other adjustment will be required to bring the partition 6 into proper position, under the proper tension, when putting together the two cylinders after separation. The tightening of the joint flange nuts will properly seat the said plate. Moreover, it is obvious that, inasmuch as the removable partition plate 6 is of larger diameter than the low pressure cylinder,and is seated from the high pressure end, the steam in the high pressure cylinder, co-operates to hold the said plate to its seat. It has already been noted, that, upon the separation of the two cylinder castings and the removal of said partition plate 6, access is alforded to both cylinders; and it is equally obvious and should be noted that both pistons may, then, be removed from their cylinders, without separation of either from their common rod.

I have shown a starting valve 12 on a sidewise extended portion of the valve-seat, cooperating with passages 13, in communication with the high pressure ports a a in the said seat. These valves 12 are on a common rod 14, operative by hand, for converting the compounds into simple acting engines, at will. The said valves 12 and the ports 13, for co-operation therewith, are identical in construction and relation to the distribution valves and their seats, with the starting valve shown, described and claimed in my above noted pending and allowed application, Serial No. 481,297. The valves 12 normally close the ports 13.

What I claim,and desire to secure byLetters Patent of the United States, is as follows:

1. In a tandem compound engine, wherein the distribution is eifected from a common seat on the low pressure cylinder and the pistons move in the same direction, thecombination with the outer end high pressure port, of the inner end high pressure port, having continuous therewith a clearance chamber formed in the low pressure cylinder casting an opening into the inner end of the high pressure cylinder, whereby the excessive clearance caused by the necessary length of said outer end port may be compensated for by said inner end clearance chamber, substantially as described.

2. In a tandem compound engine, wherein the distribution is eifected from a common seat on the low pressure cylinder and the pistons move in the same direction, the combination with the outer end high pressure port, of the high pressure piston recessed on its inner face to afford inner end clearance, and the inner end high pressure port having continuous therewith a clearance chamber formed in the low pressure cylinder casting and opening into the inner end of the high pressure cylinder, whereby the inner end cident with the bridge wall dividing the in ner high and low pressure ports, and forming the inner end of both cylinders, substantially as described.

4. In a tandemcompound engine havinga common valve-seat located on thelow pressure cylinder, the combination with the low pressure cylinder casting having an enlarged recess at its inner end, for forming an inner end high pressure clearance chamber, of the removable partition, seated in said recess coincident with the bridge wall dividing theinner high and low pressure ports and for-m ing the inner end of both cylinders, and setscrews tapped through the high pressure cylinder flange and bearing against said partition for holding the same in position, substantially as described.

In testimony whereof I aflix my signature in presence of two witnesses ELLIS, J. WOOLF.

Witnesses:

E. F. ELMORE, J As'F. WILLIAMsoN.

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