US2341348A - Lubricating apparatus - Google Patents

Description

- Feb. 8, 1944. -H. R. WELBY 2,341,348

LUBRICA'IING APPARATUS Filed March 28, 1940 3 Sheets-Sheet 1.

FIG. l2

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W ATTORNEY H. R. WELBY LUBRICATING APPARATUS Filed March 28, 1940 Feb. 8, 1944.

3 Sheets-Sheet 2 Fla-7 M50236 25.53 wmnmwwmm PISTON POSITiON FROM HEAD f INVENTOR ,g/ 411i? BY k W {Yo-2J1; ATTORNEY Feb. 8, 1944. H. R. WELBY 2,341,348

LUBRI CAT ING APPARATUS Filed March 28, 1940 3 Sheets-Sheet 3 k. S I\ fsz ax m- 1 A v/ 4 v as 3 9 I INVENTOR M AT I'OYRNEY Patented Feb. 8, 1944 LUBRICATENG APPARATUS Henry R. Welby,

Detroit, Mich, assignor to Detroit Lubricator Company, Detroit, Mich, a

corporation of Michigan Application March 28, 1940, Serial No. 326,462

8 Claims.

My invention relates generally to lubricating apparatus and more particularly to apparatus for lubricating the internal walls of a reciproeating type steam engine.

One object of my invention is to provide means for supplying oil to the cylinder of a steam engme.

Another object is to provide means for admitting the oil solely into the portion of the cylinder which is in the working phase.

Another object is to provide means for operating the admitting means by the steam pressure of the cylinder portions.

Another object is to provide means for rapidly blowing the oil admitted by the admitting means into the cylinder.

The invention consists in the new and novel parts and arrangement thereof, the novelty of which will be particularly pointed out and distinctly claimed.

In the accompanying drawings, to be taken as a part of this specification, I have fully and clearly illustrated a preferred embodiment of my invention, in which drawings Figure 1 is a side view in elevation showing my control apparatus affixed to a portion of a 1000- motive;

Fig. 2 is an end view of my control apparatus secured to a portion of a locomotive;

Fig. 3 is a view of the control apparatus and taken substantially along the line 3-3 of Fig. 2 looking in the direction of the arrows;

Fig. 4 is a view taken substantially along the line 5-4 of Fig. 3 looking in the direction of the arrows;

Fig. 5 is a view taken substantially along the line 5-5 of Fig. 3 looking in the direction of the arrows;

Fig. 6 is a view taken substantially along the line 6-6 of Fig. 3 looking in the direction of the arrows;

Fig. 7 is a diagrammatic view of a portion of a steam engine including the steam controlling valve and the power cylinder, and of the lubricant flow controlling means connected thereto,

with the members in position just after the start of a power stroke or for movement of the piston to the leftj Fig. 8 is a diagrammatic View similar to that of Fig. 7, showing the position of the members just prior to the completion of the movement of the piston to the left, and showing the flow controlling means in a transitory position while moving to the right;

Fig. 9 is a diagrammatic view similar to that of Fig. 7, but showing the position of the parts an instant later than the showing in Fig. 8, with the flow controlling means in its position for supplying oil to the left end of the cylinder;

Fig. 10 is a diagrammatic view similar to that of Fig. 7, but showing the position of the engine parts during the power stroke of the piston when it is moving toward the right, and of the flow controlling means for supplying oil to the left end of the cylinder;

Fig. 11 shows a representative steam indicator card for both portions of the power cylinder and showing the operation of the lubricant flow controlling means;

Fig. 12 is a View in horizontal cross-section showing a modified form of my flow controlling means and with the members shown in a position similar to the showing of Fig. 8, and

Fig. 13 is a view in vertical cross-section showing the steam connection to the oil supplyline of the modified controlling means.

Referring to the drawings by characters of reference, the numeral l. designates generally my oil controlling apparatus or means having an oil inlet 2, steam inlets 3, 4 and steam atomized oil outlets 5, 6. The inlets 3 and 4 are connected by means of conduits or tubes 3 4 to the cylinder live steam supplying conduits or passageways 3", 4 The inlet 2 is screw-threadedly secured to one end of a pipe nipple or conduit portion '1 which has its other end connected to the outlet l of a pressure sensitive oil line check valve 8. The checkvalve 8 is any of the well known types and may be similar to that shown in Letters Patent 1,843,068, granted January 26, 1932, to Adolf von Wangenheim et al. The nipple 7 extends through an aperture in a horizontal arm 9 of a supporting member Iii secured as by bolts to a wall of the main or power cylinder H. A nut 12, threaded externally to the nipple I, is clamped tightly to one face of the arm 9 and holds a shoulder of the valve 8 against the other face of the arm 9 to rigidly mount the control apparatus 1 and the valve 8. Oil under pressure from a suitable force feed mechanical lubricator, such as is shown in either of the Letters Patents 1,959,698 dated May 22, 1934, or 1,991,340, dated February 12, 1935, each granted to Adolf von Wangenheim, is supplied to the valve 8 through a conduit !3, and flows upward through the valve outlet 1% and nipple 1 into the control apparatus l where it is discharged through the outlets 5, 6 into conduits l4, 15 for transmission to the left and right ends I6, ll, respectively, of the power cylinder I l. The steam inlets 3, 4 are respectively connected by means of the conduits 3, 4 to main steam supplying conduits 3 4*, respectively, supplying the left and right ends I6, II, respectively, of the power cylinder II.

In Figs. 3, 4, 5 and 6 the control means I is shown in greater detail. The means I comprises a casting or housing member having a horizontal cylindrical bore 22 opening through opposite ends 23, 24 thereof which are closed by nipples threadedly secured in the open ends, and which nipples form the steam inlets 3, 4. The inlet 2 leads vertically upward and opens into the bore 22 through its side wall and the opening is substantially midway between the ends 23, 24. IA pair of horizontally extending passageways or conduits 28, 21 lead outward from the side wall of bore 22 and terminate in threaded portions 28, 29 in which are threadedly secured nipples forming the outlets 5, 6. The openings of the conduits 26, 21 into the bore 22 are spaced from the midpoint of the bore 22 toward the ends 23, 24, respectively. Reciprocally movable within the bore 22 is a cylindrical piston or plunger member 33 which, due to its tight piston-fit with the walls of the bore 22, cooperates with the side wall openings to form a slide valve. The longitudinal position of. the plunger 30 within the bore 22 is determined by the relative pressure within the steam inlets 3, 4.

When the plunger 30 is in its extreme left position, as shown in Fig. 3, the opening of the inlet 2 is communicatively connected to the opening of the horizontal outlet passageway 21 by means of a recess 3I in the outer wall of the plunger 30 which, for example, might be a slot milled therein. Steam from the steam inlet 4 is also conducted to the recess 3I through a passageway 32 which has a portion opening radially outward into the recess, and has a longitudinally extending portion which may open centrally through the right end of the plunger 30, When the plunger 30 is in its position furthest toward the right, the inlet 2 is similarly connected to the horizontal outlet passageway 26 through a recess 3|. The steam inlet 3 is connected in a manner similar to the inlet 4 to the recess 3| by means of a passageway 32. The plunger 30 which operates as a slide valve therefore alternately connects the inlet 2 to the outlets 5. B for flow of lubricant to the cylinder ends I6, IT. The plunger 30 has a longitudinal recess or guideway 33 in its upper wall portion which receives an end or guide portion of a cap screw 34 threadedly secured within an aperture through the top wall of the bore 22, i

and the guideway 33 and guide portion of screw 34 cooperate to prevent axial rotation of the plunger 30 within the bore 22 thereby to maintain the recesses 3|, 3i in correct cooperative relation with the openings through the side Walls of the bore 22.

For the purpose of safety, in case the plunger 30 should stick in a midposition, the plunger is recessed, as at 35, so that the opening of the inlet 2 is communicatively connected to each of the horizontal passageways 2B, 21 for supply of oil to both the cylinder ends IE, II.

In Figs. '7, 8, 9 and 10 for the sake of simplicity and convenient showing of the operation of the control means I, the control means I and the valve 8 are shown as if cast directly in a web connecting a steam chest 5I with the main power cylinder II. The preferred commercial embodiment however is that which is shown in Figs. 1 to 6 in which the valve 8 and the means I form an independent unit mounted externally of the cylinder I I and or the steam chest 5 I. The steam chest 5| is shown as having a live steam inlet 52 for connection to a suitable steam generator such as a boiler which supplies the live steam through a suitable throttle valve (not shown) to the inlet chamber 53 of the steam chest 5I formed intermediate two interconnected piston- like slide valves 54, 55. The valves are operated by means of a plunger or rod 56 which is in turn operated by suitable mechanism in the usual manner so that the valves 54, are moved to open ports 51, 58 to the steam inlet chamber 53 or to exhaust chambers 59, 60 for control of the steam flow through the passageways 3 4 in the usual manner. The piston 6| has a thrust rod 62 for transmitting work to a locomotive drive wheel or other power applying means (not shown) driven by the piston 6|.

The valve means 8 is shown as having a pressure sensitive diaphragm 63 which carries a valve element 64 and which is biased to urge the element 64 against its seat and into valve closed position. The biasing of the diaphragm 63 is such that it will not open the valve element 64 to flow until the pressure of the oil within a chamber 65 of valve means 8 is above the maximum pressure of the steam within the passageways 3 4". Upon the given oil pressure being attained within the chamber 65 the pressure acts on the diaphragm B3 to move the valve element 64 from its seat to allow oil to flow to the inlet 2 of the control means I.

In Figs. 12 and 13 there is shown a modification of the control means I in which a separate steam line 65 which is in constant communication with the main line steam supply 65 either ahead of or after the main throttle valve (as shown) is connected to a horizontal passageway 66 which does not open into the bore 22 but opens through a small diameter bore 61 into the inlet 2 adjacent its opening to the bore 22 so that as the oil is admitted to the bore 22 and recesses 3|, or 3I the steam supplied to passageway 66 will blow the oil through the conduits 26 or 21 into the cylinder ends I6 or IT. A shut-off valve 68 may be placed in the steam line to the control means I so that during idle periods of the engine the flow of steam to the means I may be discontinued. Passageways 32 and 32 are omitted in the modified form of the means I.

The operation of the control means I may best be seen in Figs. '7, 8, 9 and 10 which show four different positions of engine operation and which is as follows: In Fig. 7 the piston slide valve 54 is open to allow the spent steam in the cylinder end I6 to exhaust and the piston slide valve 55 has opened the passageway 4 for flow of live steam from the chamber 53 to the cylinder end IT. The live steam is acting on the piston BI and moving it toward the left so that it is uncovering the opening of the conduit I5 into the cylinder end IT. The plunger 30 is already at the extreme left end of the bore 22 so that the inlet 2 of the control means I is communicatively connected by means of the recess 3| to the conduit I5. The oil, which is admitted to the inlet 2 by the valve element 64, is flowing in the recess 3I where it is picked up by the steam which flows from the passageway 4 conduit 4, passageway 32 and into recess 3| from whence it is blown in an atomized condition through conduit I5 into the cylinder end I'I.

Steam is continually admitted through passageway 4 until the piston 6| has moved toward the lef-t 'a predetermined amount, which is-determined in the-usual manner and weurn'own to those skilled in'th'e art, at which time the slide valve 55 closes'an'd the normal expansion of the steam, with decrease intemperature and pressure occurs. Shortlyafter the live steam'has been out off by closure of the slide valve 55, the slide valve d moves to a position to close the passageway 3 to the exhaust chamber 59. Fig. 8 shows the position of piston 6i 'aiter'the slide valve 54 has closed the passageway 3 to the steam chest 55 and the slide valve 55 has opened the passageway i for exhaust of the steam within the cylinder end i? to the exhaust chamber '69. The valve 54 being closed and the piston 5| having continued i movement toward the left, the pressure within cylinder end it and passageway 3* increases and since the pressure Within passageway A and the cylinder end i l is low, due to 'the'open slide valve 55, the plunger 3i] will'be moved toward theright end of the bore 22 and will for an instant be in the position shown in Fig. 8. Almost immediately however, the plunger 38 will under normal operation move to the position shown in Fig. 9.

In this position it will be noted the piston 6! is in substantially the same but in reality the piston 6| has moved slightly toward the left. The trapped steam within the cylinder end i ii and passageway 3 acts to cushion position as in Fig. 8,

the piston fil as it reaches the end portion of its travel.

In Fig. 10 the piston '6! has already reached the extreme left position and is moving toward the right underthe effect of the live steam which is being admitted through the slide valve 54.

The piston 65 is already beyond the opening of the conduit M- into the cylinder end I6, and oil from the inlet 2 flows to the recess ti from whence it is blown by steam admitted to the recess di by means of the passageway 32 and the conduit i4 into the cylinder end l6. As the piston 5i approaches the right-end of the cylinder 1 l, the same relative sequence of operation would occur as occurred at the left end, and each subsequent stroke of piston 6| will cause a repetition of the described-operation.

Fig. 11 shows a sample steam indicator card of a steam cylinder in which the position of piston 6| in relation to steam pressure within the cylinder end it isshown in full line and to which reference is made to bring out more in detail the operation of the oil controlling means i. The openings of the atomized oil conduits M, 15 for the most satisfactory operation are located in the walls of the cylinder I I so the piston iii until the piston has moved a predetermined distance away from one end. The reference character A indicates the position of the piston til at the time the valve 54 opens to admit live steam. to cylinder end It. Point B indicates the positio-nof piston 3! when thepiston has moved-toward the right-a distance suflicient to open the outlet of the conduit it. Point C indicates the point at which the valve 54 cuts oil the flow of live steam steam to the cylinder end it, while points D and E indicate the opening and closing, respectively, of the valve 54 to exhaust the spent steam from the cylinder end it. It will be noted that the position of the opening of conduit it is so arranged relative to a normal steam and piston cycle that the piston 6| does not act to uncover the opening of conduit M until the piston is well on its way in a power stroke to the right, under the influence of steam admitted by the valve 5%, and which opening it will be noted that they are closed by *3 is closed loy the piston 6:, wnen z'noving "toward the left, prior to tne normai opening by the plunger n'r conduit l4. On-movement ofthe piston 6! on a power stroke, steam under'a pressure whichisat least'sufiicient tomove the piston 6! against the opposing tame exerted'by the rod 62/moves the piston-6| toward the right and the volume of the'cylinder "end increases which is immediately'filled with live steam which is ad- 'mitted through the valve 54 and passageway 3 As is well known to those skilled in the art, flow o-fa fluid through a conduit or passageway is accompanied bya drop in pressureof the fluid as it passes the'rethrough, which in any given con- =duit varies with the rate of fluid flow. There- -fore,-it mayn'ow 'be seen that there will be a dif- 'ference of pressure between the point at which the conduit 3 opens into the passageway 3 and 'duit ll, point G,

direction toward the cylinder end l6, 'sufiicient magnitude to blow any oil admitted to A of the dash-dot chart inlet 2 with the pressure within the cylinder end It. This diiierehce in pressure causes steam to flow through conduit 1%, passageway 32 recess 3M,

and conduit M to the cylinder end it. The steam new so 'caused'atomi'zes'the blows any oil into the cylinder end 16 which may be admitted to the recess'fi l 'fro'm the inlet 2. or movement of piston 5i to the left, the piston 6! moves toa position closing the conduit 14 to flow prior to movement of the plunger 30 to open On the return stroke the conduit Id to flow. Movement of plunger 30 to the right occurs when the steam pressure condition and the position of piston 6! is that indicated at F, and which position is as stated above subsequent to closing of'the opening of the conby the piston 6|. The flow through the conduit M is therefore always in the and is of recess ill into thecylinder end it. end i! has a steam chart shown in dash-dot lines and which is similar in form to that shown in fulllinefor the end 36 except that the point appears at the right side and point D appears at the left side because as the cylinder end it; is exhausting, the cylinder end IT is in the power stroke. It may now be Thecylinder seen that due to the action of the relative pressures withinthe cylinder ends it and I! acting on the end walls of the plunger 30, the plunger 3!) is moved to the left to close the conduit I4 and to open the conduit 15 at the point H which is identical inv piston position with point P as shown by the vertical line b. The vertical line a which extends through the points H and F indicates that both points occur at the same position of the piston El. The control means i admits oil or other lubricant into the working cylinder end and only during the power stroke, and therefore a smaller amount of oil is necessary to lubricate the piston. Not only is this advantageous from an economy standpoint, but it also reduces the formation of-carbon on the cylinder heads and exhaust stacks and results in greater operating economy.

In the event that the plunger 36 should stick in the position shown in Fig. 8, the passageway or recess 35 will communicatively connect the each of the conduits l4 and t5 and oil will how to both of the cylinder ends it and IT.

The operation of the modification of the means as shown in Figs. 12 and 13 is substantially the same as that described, with the exception that the steam used to blow in the oil is admitted into the inlet 2 directly from the live steam line either before or after the 'throttle'inste'ad of being admitted from the -steam passageways 3 4 and through the plunger 30 end walls. It will be evident that the advantages hereinbefore set forth will be equally applicable to the operation of the modification.

What I claim and desire to secure by Letters Patent of the United States is:

l. A lubricating apparatus for a iston of a reciprocating steam engine comprising a working cylinder, a working piston reciprocable in said working cylinder, a steam conduit connected to one end of said working cylinder, a steam conduit connected to the other end of said working cylinder, a steam valve controlling flow through and determining high pressures alternately in said steam conduits, an oil conduit opening into said one end of said working cylinder, an oil conduit opening into said other end of said working cylinder, piston operated valve means having two positions and determining alternate flow through said oil conduits, said piston operated valve means being so constructed and arranged that it is operable in one position to provide oil flow to said first-named oil conduit and to cut off oil flow to said second-named oil conduit when said working piston is at said one end of said working cylinder, said piston operated valve means being so constructed and arranged that it is operable in the second position to cut off oil flow to said first-named oil conduit and to provide oil flow to said second-named oil conduit when said working piston is at said other end of said working cylinder, a pressure conveying conduit leading from said first-named steam conduit on the working cylinder side of said steam valve and connected to one side of said piston operated valve means so that pressure in said first-named steam conduit will move said piston operated valve means to said one position, and a pressure conveying conduit leading from said secondnamed steam conduit on the working cylinder side of said steam valve and connected to the other side of said piston operated valve means so that pressure in said second-nalned steam conduit will move said piston operated valve means to said second position.

2. A lubricating apparatus for a piston of a reciprocating steam engine comprising a working cylinder, a working piston reciprocable in said working cylinder, a steam conduit connected to one end of said working cylinder, a steam conduit connected to the other end of said working cylinder, a steam valve controlling flow through and determining high pressures alternately in said steam conduits, an oil conduit opening through a side wall of said one end of said working cylinder within the range of travel of said working piston so that said working piston is operable to control flow through said conduit, an oil conduit opening through a side wall of said other end of said working cylinder within the range of travel of said working piston so that said working piston is operable to control flow through said second-named oil conduit, piston operated valve means having two positions and determining alternate flow through said oil conduits, said piston operated valve means being so constructed and arranged that it is operable in one position to provide oil flow to said first-named oil conduit and to cut off oil flow to said secondnamed oil conduit when said working piston is at said one end of said working cylinder, said piston operated valve means being so constructed and arranged that it is operable in the second position to cut ofi oil flow to said first-named oil conduit and to provide oil fiow to said second-named oil conduit when said working piston is at said other end of said working cylinder, a pressure conveying conduit leading from said first-named steam conduit on the working cylinder side of said steam valve and connected to one side of said piston operated valve means so that pressure in said first-named steam conduit will move said piston operated valve means to said one position, and a pressure conveying conduit leading from said second-named steam conduit on the working cylinder side of said steam valve and connected to the other side of said piston operated valve means so that pressure in said second-named steam conduit will move said piston operated valve means to said second position.

3. A lubricating apparatus for a piston of a reciprocating steam engine comprising a working cylinder, a working piston reciprocable in said working cylinder, a steam conduit connected to one end of said working cylinder, a'steam conduit connected to the other end of said working cylinder, a steam valve controlling flow through and determining high pressures alternately in said steam conduits, an auxiliary cylinder, means for supplying oil to said auxiliary cylinder, an oil conduit leading from said auxiliary cylinder and opening into said one end of said working cylinder, an oil supplying conduit leading from said auxiliary cylinder and opening into said other end of said working cylinder, a piston valve member reciprocable in said auxiliary cylinder to two positions and determining alternate flow from said oil supplying means to said oil conduits, said piston valve member being so constructed and arranged that it is operable in one position to provide oil flow from said oil supplying means to said first-named oil conduit and to cut off oil flow from said oil supplying means to said second-named oil conduit when said working piston is at said one end of said working cylinder, said piston valve member being so constructed and arranged that it is operable in the second position to cut off oil flow from said oil supplying means to said first-named oil conduit and to provide oil flow from said oil supplying means to said second-named oil conduit when said working piston is at said other end of said working cylinder, a pressure conveying conduit leading from said first-named steam conduit on the working cylinder side of said steam valve and connected to one end of said auxiliary cylinder so that pressure in said first-named steam conduit will move said piston valve member to said one position, and a pressure conveying conduit leading from said second-named steam conduit on the working cylinder side of said steam valve and connected to the other end of said auxiliary cylinder so that pressure in said second-named steam conduit will move said piston valve member to said second position.

4. A lubricating apparatus for a piston of a reciprocating steam engine comprising a Working cylinder, at working piston reciprocable in said working cylinder, a steam conduit connected to one end of said working cylinder, a steam conduit connected to the other end of said working cylinder, a steam valve determining high pressures alternately in said steam conduits, an auxiliary cylinder, means for supplying oil to said auxiliary cylinder, an oil conduit leading from said auxiliary cylinder and opening into said one end of said working cylinder, an oil supplying conduit leading from said auxiliary cylinder and opening into said other end of said working cylinder, a piston valve member reciprocable in said auxiliary cylinder to two positions and determining alternate flow from, said oil supplying means to said oil conduits, said piston valve member being so constructed and arranged that it is operable in one position to provide oil flow from said oil supplying means to said first-named oil conduit and to cut oft" oil flow from said oil supplying means to said second-named oil conduit when said Working piston is at said one end of said working cylinder, said piston valve member being so constructed and arranged that it is operable in the second position to cut off oil flow from said oil supplying means to said first-named oil conduit and to provide oil flow from said oil supplying means to said second-named oil conduit when said working piston is at said other end of said Working cylinder, a pressure conveying conduit leading from said first-named steam conduit on the working cylinder side of said steam valve and connected to one end of said auxiliary cylinder so that pressure in said first-named steam conduit will move said piston valve member to said one position, and a pressure conveying conduit leading from said second-named steam conduit on the working cylinder side of said steam valve and connected to the other end of said auxiliary cylinder so that pressure in said second-named steam conduit will move said piston valve member to said second position, said piston valve member having a safety oil flow passageway operable to connect said oil supplying means simultaneously to said oil conduits when said piston valve member is intermediate said two positions.

5. A lubricating apparatus for a piston of a reciprocating steam engine comprising a working cylinder, a working piston reciprocable in said working cylinder, a steam conduit connected to one end of said working cylinder, a steam conduit connected to the other end of said working cylinder, a steam valve controlling flow through and determining high pressures alternately in said steam conduits, an auxiliary cylinder, means for supplying oil to said auxiliary cylinder, an oil conduit leading from said auxiliary cylinder and opening into said one end of said Working cylinder, an oil supplying conduit leading from said auxiliary cylinder and opening into said other end of said working cylinder, a piston valve member reciprocable in said auxiliary cylinder to two positions and determining alternate flow from said oil supplying means to said oil conduits, said piston valve member having an oil flow passageway operable to connect said oil supplying means to said first-named oil conduit and having a shutoff portion operable to close said second-named oil conduit when said piston valve member is at one end of said auxiliary cylinder, said piston valve member having an oil flow passageway operable to connect said oil supplying means to said second-named oil conduit and having a shut-oil portion operable to close said first-named oil conduit when said piston valve member is at the other end of said auxiliary cylinder, a pressure conveying conduit leading from said first-named steam conduit on the working cylinder side of said Steam valve and connected to said other end of said auxiliary cylinder so that pressure in said first-named steam conduit will move said piston valve member to said one end of said auxiliary cylinder, and a pressure conveying conduit leading from said second-named steam conduit on the working cylinder side of said steam valve and connected to said one end of said auxiliary cylinder so that pressure in said second-named steam conduit will move said piston valve member to said other end of said auxiliary cylinder.

6. In a lubricating apparatus, a hollow cylinder, a piston valve member reciprocable in said cylinder, said cylinder having an oil supply port opening intermediate the ends of and into said cylinder, said cylinder having spaced oil discharge ports opening intermediate the ends of and from said cylinder, said piston valve member having spaced passageways therethrough operable upon reciprocation of said piston valve member to connect alternately said oil supply port to said oil discharge ports, the wall of said cylinder being operable alternately to close said passageways upon reciprocation of said piston valve member, and said cylinder having steam supply ports for supplying steam to reciprocate said piston valve member.

7. In a lubricating apparatus, a hollow cylinder, a piston valve member reciprocable in said cylinder, said cylinder having an oil supply port opening intermediate the ends of and into said cylinder, said cylinder having spaced oil discharge ports opening intermediate the ends of and from said cylinder, said piston valve member having spaced passageways therethrough operable upon reciprocation of said piston valve member to connect alternately said oil supply port to said oil discharge ports, the wall of said cylinder being operable alternately to close said passageways upon reciprocation of said piston valve member, said piston valve member having a safety oil flow passageway therethrough intermediate said passageways and operable to connect said oil supply port simultaneously to said oil discharge ports, and said cylinder having steam supply ports for supplying steam to reciprocate said piston valve member.

8. In a lubricating apparatus, a hollow cylinder, a piston valve member reciprocable in said cylinder, said cylinder having an oil supply port opening intermediate the ends of and into said cylinder, said cylinder having spaced oil discharge ports opening intermediate the ends of and from said cylinder, said piston valve member having spaced passageways therethrough operable upon reciprocation of said piston valve member to connect alternately said oil supply port to said oil discharge ports, the wall of said cylinder being operable alternately to close said passageways upon reciprocation of said piston valve member, said cylinder having steam supply ports for supplying steam to reciprocate said piston valve member, and said piston valve member having alined ports through its opposite end walls opening into said passageways to supply atomizing steam to said passageways.

HENRY R. WELBY.

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