USRE10682E - Hekey c - Google Patents

Description

' I 2 SheetsSl 1eet 2. H. U. SERGEANT. STEAM AGTUATED VALVE.

Reissued Feb. 2,1886.

UNITED STATES PATENT OFFICE.

STEAM-ACTUATED VALVE.

SPECIFICATION. orming'part of'Reissued Letters Patent No.10,6 82,.dated February 2, 1335 Original x5. 330,068, dated Novcmher'll), Application for rcissucfiled Dccrniber I2, 1885. $rria] No. 15.5 m).

To aZZ whom it may concern:

Be it known that I, HENRY G. Snuonxur, of the city and county of NL w York, in the State of New York, have invented a new and inder and the exhaust-of motive fluid from the ends of such main cylinder after it has performed its work of reciprocating the piston therein. In both said patents the main piston, by its longitudinal reciprocation inthe cylinder, places the ends of the auxiliary or valve cylinder alternately in communication with the main exhaust port or passage, and when this is done the pressure of motive'fluid in the opposite end of said auxiliary cylinder acts upon the auxiliary piston therein and moves the said piston and the main valve, so

as to produce the return-stroke of the main.

piston within the main cylinder.

My present invention consists in the novel construction of the several parts of an engine having such valve mechanism, and in a novel manner of combining said parts together, as

vhereinafter more fullydescribcd, and pointed out in the claims. r

In the aecompanylng drawings, Figure 1 representsa longitudinal section of such parts of a rock-drill as are necessary to illustrate my invention. Fig. 2 represents a transverse section on the plane of the dotted line a: m, Fig. 1. Fig. 3 represents a similar section on the plane of thedotted line 3 y, Fig. 1; and Fig. 4 represents a horizontal section of the auxiliary cylinder and valve chest on the plane of the dotted line 2 2, Fig. 1, including a plan of a portion of the main cylinder, the main' valve and auxiliary piston being removed in order to illustrate more clearly the ports and passages whereby the admission of steam to and its exhaust from the main cylinder are controlled. 1

Similar letters of reference designate corresponding parts in all the figures.

A designates the main cylinder of a rock- (lrill, and B designates a piston fitted to move therein, and provided with suitable packing, b to prevent leakage. At the lower end the cylinder is closed by a head, A, and at the upper end is fitted a head, A which may consist of a cylindric piece of metal fitting within ring or plate, A, having a circular bore, a, for the head. The head A may be held in place by spring-pressure, as shown in my application for Letters Patent, Serial No.

157,445, filed March 2, 1885.' The piston has a rod, B, to which the drill or bit may be secured,'and the piston is rotated by inechau ism similar to that shown in my aforesaid application, or by any other suitable mechanism. This mechanism for rotating the piston and drill forms, no part of my present invention,

and but little description thereof will be necessary. The cylinder A is rabbeted or counterbored to form'a shoulder, a, and upon this shoulder is fitted a ring or ilangepl. I designates a spiral bar, which is receive within a cavity in the piston and fits a nut therein, and which passes through the ring or flange J. The head I of this bar is locked to a ring, G, which is supported by a spring, G, interposed between it and the ring J; and H designates a second ring, which is here shown as clamped and held by friction between the head A and the end of the cylinder. The rings Gr II are provided on their adjacent faces with ratchet-shaped teeth, which engage with each other, and as thcpiston is moved downward or makes its working-stroke the ring G turns upon the ring H,the spring G permitting the ring G to yield in order that its teeth may pass the teeth of the ring H. On'the up or return stroke of the piston, however, the teeth of the ring G interlock with the teeth of the ring H, and by holding the spiral bar 1 against turning produces the turning of the piston.- I have employed the same letters to designate these parts as are used in my aforesaid appli cation, and no further description thereof is same casting as the main cylinder A.

necessary. In lieu of this combination of mechanism for rotating the piston and drill, anyother suitable rotating device may be employed.

O designates an auxiliary cylinderand valve chest, which, as here shown, is made in the I have. here represented the cylinder 0 as provided with a removable lining or bushing, G, and closed at the ends by heads G secured in place by bolts 0. y

D designates the auxiliary piston, which is fitted to reciprocate Within the auxiliary cylinder G or within the removable lining C therein, and which has formed'in it by casting the main valve D. a double D-valve'with cavities or coves d cast within it, and has at opposite ends ofsuch cavities or coves apertures or ports d.

The cylinder is provided with passages a m",

leading from --its opposite ends to the valve chest 0, and communicating therewith by ports or apertures a a 65* Between the orts or a ertures a 54 is the main exhaust port or cavity (d, which communicates with the atmosphere at a, as shown in Fig. 3. I have here shown a screw, 6, which is inserted in the side of the auxiliary cylinder 0, and

' the end of which projects through the lining posite side of the auxiliary cylinder 0, I have G and enters a slot, (i cutin theauxiliary piston, as best shown in Fig. 3. This slot-andpin connection permits of the auxiliary piston D being freely reciprocated, and at the This main valve is,

same time prevents its turning, so that the coves or cavities will at all times registerwith the several ports in the lining 0. At the oprepresented a supply-pipe, f, and in the lining 0 and auxiliary piston D are slots or passages c d, which register with each other, and through which the steam or other motive fluid enters freely. the interior of the auxiliary pis- 7 ton D. The slotd is made of sufiicient length so that the interior of the auxiliary piston D will be at all times in free communication with thesupplyfof motive fluid.

I have also shown the cylinder A- as provided with small ports g 9*, leading therefrom to and through the lining C of the auxiliary cylinder (3, and in the same planes transversely of the cylinder as the ports 9 51* are oth'erports, gy'*, which com municate through passages or cavitiesg with the main exhaust,

as bestshown in Fig. 3. The ports or passages g {1* are formed in posts or bridges, which extend directly across the passages a a and the latter passages are at these points widened out, so as to aiford ample space for the passage of motivelfl uid around such posts or bridges. The several ports 9 c a a a a* 9* are formed by coring out the cylinder structure, and will not have clearly-defined edges; but such ports, or continuations thereof, are accurately formed or cut in the lining O, and are there properly spaced for the main valve and auxiliary piston to work upon. After being provided with these holes the lining O is slipped into place in the auxiliary cylinder G and secured therein by the heads G I have here shown at each end of the auxiliary cylinder apackingywhich consists ofa thin metal plate, h, and a sheet of rubber packing, h, resting thereon and interposed between such metal plate and the head 0 v In the ends of the auxiliary piston D, I have represented holes through which motive fluid may pass from the interior of the piston. to the ends of the auxiliary cylinderC and the hole in the left-hand end of the auxiliary I piston (shown in Fig. l) is larger than the, hole in the other end thereof, for apurpose hereinafter described. The holes *in the ends of the auxiliary piston D arenot indispensable,

for the leakage of the motive fluid between the piston and the lining O at the supplyslots c (1 will be sufficient to supply motive fluid to the ends of the'v'alvechest and cylinder Gr In the piston anew representeda portion, 18*, of reduced diameter, and it willbe clearly seen that when such portion of reduced diameter comes opposite, either of the passages g 9* such passage will be placed in communica .tion with the companion passage 9 or which'le'ads to the main exhaust cf.

' As represented in the drawings, Fig-.,i, tl1e ICU auxiliary piston, through-the port'sd' c*"and passagelafi, to-the'upper end ofthercylinder,

and at th'e sa'metime motive fluid may exhaust from the lower mid of the cylinder, through the passage (1 a", and cove or cavity d,'into the main exhaust a The motive fluid admitted to the right-hand or upper end of the cylinder will force the piston toward the left, and at the same time motive fluid will have passed through the aperture in the let'uhand end of the auxiliary piston, or between the piston and lining G', s o as to fill the left-hand end of the auxiliary cylinder 0. The ports will remain in the position shown until the reduced portion 13* in the piston comes opposite the ports g 9'; but the instant this occurs the left-handendof the auxiliary cylinder. 0 will by the ports g g be placed iii-communication with the main ex hausta", thereby relieving the left-hand end of the auxiliar piston of )ressure and the motive fluid which has leaked through the aperture in the right-hand end of the piston will. thereupon force the auxiliary piston toward the left of Fig. l sufficiently to shut oh the motive fluid from the passage a and to admit motive fluid through the passage d aa to the lower end of the cylinder A. While the auxiliary piston D is at rest in either posi- ,tiou, motive fluid will pass through the holes or apertures or between the piston and lining,andaccumulate pressure in opposite ends of the auxiliarycylinder O, and the reduced.

portion of the piston 13* will alternately place said ends of the auxiliary cylinder in free communication with the main exhaust,

' If the holes or openings in the ends of the 2 0 turn or upstroke will be reduced.

auxiliary piston are employed,it is advantageous to have the hole or opening in the left :hand end of the auxiliary piston larger than that in the righthand end thereof, because pressure in the left-hand end of the auxiliary cylinder will then, beyond a doubt, be suffi- 1 cient toforc'e the auxiliary; piston toward the right the instant thepre'ssurein the right-hand endof said cylinder is relieved, and hence the liability of the main piston striking the upper head of the main cylinder in making its re- Although I. have only represented my in- I vent-ion as embodied in a rock-drill, it may be employed with advantagein other direct-act ing engines, such as steamhammers, punching and riveting machines, and direct-acting steam-pumps.

- By making a removable and'renewable lining, C, for the auxiliary cylinder 0, Iprovide' for easily and cheaply forming the ports on whichthe valve works so. that they will accurately register, and when the valve and lining become .worn they may be readily revmoved and a new valve and lining slipped into place withouttaking the machine to a re;

pair-shop.

the supply-openings.

One important feature or element of my in vention is the double D-valvehaving its two exhaust coves or cavitiesd open on the under side of the valve only, and independent of The pressure of motive fluid within the valve-chest serves to hold such a-valve tightly upon'its seat, and so prevent leakage of live motive fluid through as must be done with the valve shown in patthe exhaust-ports; and the employment'ot' a double D-valve enables me to extend the passages g y gl g* directly from the valve-chest to the main cylinder, and obviates the ne- .c essity of crossing certain of such passages from one end to the other of the valve chest,

' cut to A. C. Rand, No. 328,612, dated October What I claim as my invention, and desire to secure by Letters Patent, is-

'1'. The combination, with the cylinder and valve-chest, constructed with ports, substantially as described, of the double. D'-valve working as a piston within the chest, and having its two exhaust coves or cavities open on the under side of the valve only, and the main piston havinga circumferential groove,whereby the ends of the valve chestare alternately opened to the exhaust, substantially as herein described.

2. The combination, with the cylinder and valve chest, constructed with ports, substan tially as described, of the double D-valve and hollc'v. auxiliary piston, having a supply-slotin its side, through which the motive fluid enters its interior, and the main piston having a circumferential groove, whereby theends of the valve-chest are alternately opened to the exhaust, substantially as herein set fo'rth.

3; In a-direct-actiug engine, the combination, with a main cylinder and an auxiliary cylinder, constructed with ports and passages,

substantially as herein described, and the aux iliary cylinder having asupply-opening between its ends, of a main piston, whereby the ends of the auxiliary cylinder will alternately be placed in communication with the main exhaust, and the auxiliary piston and main valve comprised in a single hollow structure having a slot in its side, which registers with the supply-opening in the auxiliary cylinder, and through which motive fluid is admitted into'the interior of the auxiliary piston and main valve, and having apertures in its ends, through which the motive fluid may pass from the interior of the auxiliary piston and main valve into the opposite ends of the auxiliary cylinder, in order to move the valve when the pressure upoueither end of the anxi'liary piston is relieved, substantially as herein set forth.

. 4. In a direct-acting engine, the combination,

with a main cylinder and an auxiliary cylinder constructed with ports and passages, sub.

stant-ially as described, of, alining or bushing fitted to the auxiliary cylinder, and having --formed in it ports which correspond with those of the cylinder, a reciprocating main piston serving to place the ends of the auxil iary cylinder alternately in communication with the main exhaust,.and an auxiliary piston and main valve consisting of a hollow structure, to the interior of which, motive rob fluid is admitted, and in the endsof which are holes or apertures forthe passage of motive fluid to the ends of the auxiliary cylinder, for the. purpose of moving the auxiliary piston and main valve, substantially as set forth. 5. In a direct-acting engine,thc combination, with main cylinder and auxiliary cylinder, constructed with ports and passages, substantially as herein described, and a lining having a suppiyslot in its side, of a main piston, l3, and an auxiliary piston and main valve,D

D, forming a single hollow structure, in the side of which is an opening or slot, 11 through which motive fluid enters its interior, and in the ends of which are openings through which motive tluid passes into the ends of the auxiliary cylinder, substantially as herein set forth.

6. The combination,with themain and auxiliary cylinders A C, constructed with supply and exhaust ports and passages, as described, of the passages 9 *,-leading direct from the 'ends of the auxiliary cylinder G to the main cylinder, and passages 57 9' leading to the exhaust, and arranged in the same planes 1 its sideasupply-slot, d, for motive fluid, and transversely to the cylinder as the passages'g in its ends holes or apertures substantially 9*, the main pistonhaving a portion of reas herein set forth. duced diameter, 13*, and the auxiliary piston HENRY C. SERGEANT. 5 andmai-n valve D D forming a single hollow \Vitnesses:

structure, provided with exhaust coves or, C. HALL, cavities d, and with ports d, and having in LINDEMAN.

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