US2289332A - Liquid feeding apparatus - Google Patents

Description

LIQUID FEEDING APPARATUS Ju1y14,1942. 1 GM. BQQTH 2,289,332

LIQUID FEEDING APPARATUS Original Filed May 5, 1957 6 Sheets-Sheet 2 July 14, 1942. A

original Filed May 5, 193'? G. M. BOOTH LIQUID FEEDING APPARATUS 6 Sheets-Sheet 3 203 /67 ,92 /aa 22g I /ajz July 14, l194;.

G. M. BooTH LIQUID FEEDING APPARATUS Original Filed May 5. 1957 July 14, 1942. G. M. BOOTH LIQUID FEEDING APPARATUS 6 Sheets-Sheet 5 Original Filed May 5, 1937 Wk. WNM.

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wx, ||b 4 l N\m. Sn m Ivm. Nm Sm N u H 4employing a diaphragm type brouht about vwith Paienijed ,July i4, 194g UNITED STATES PATENT OFFICE acsassz LIQUID FEEnnvG APPARATUS Y George Martin Booth, Westeld, N. J., assigner to Wallace & 'liernan Co.

Inc., Belleville, N. J.,

a corporation of New York roriginal application May s, 1931, serial No. 140,813. Divided mi this application Februf ary 9,1938, seria1N.1ss,sss

12 clama (c1. 21o-4c) dependability over long periods is a most important criterion.

It may also be explained that t'hi's invention, for these andother reasons, also provides a more eiiicient and Ldependable feeding service thanvis obtained with other pumping arrangements, such as of the plunger or piston type,

of small quantities of 10A ent invention, therefore, is to provide simple,

efficient, and inexpensive apparatus for effecting such introduction of hypochlorite solution for the puriflcation'of water as carried under pressure in a main. l i,

`A further object of the invention 'is to provide improved apparatus of the character describedof pump, but requiring little or no externally supplied power to afford a pump delivery at relatively high pressure; and also to provide suchy apparatus wherein liquid under pressurel is utilized to exert directly on the diaphragm a` force substantially equal to that needed for pump delivery.

Another object isy to provide liquid feeding apparatus including a pump having adiaphragnr of resilient material, wherein Wear and tear on the diaphragm is minimized and the life of the v latter verygreatly increased; and also to provide such apparatus, wherein those resultsare riphery and operatedv .by applying force at its center. tremendous strainsfare set up in the diaphragm, causing it to `bend and bulge rapidly, and tobe distorted in a violent and often lrregular manner, each time the device reciprocates and in fact, all the-timev maximum emciencyfandlndeed, in orderto avoid a balancing force directly or of other types wherein continuously rotating -valves or sliding valves or the like are employed;

for example, in systems 'of that character accuracy of pumping is directly dependent upon the fit or packing of one or more sliding or rotating -valves or pistons, which are not only diiiicult to manufacture with the necessary accuracy, but

are apt to leak, or set up friction losses, or be-v come otherwise unreliable.

Other objects are tol provide liquid feeding apparatus having new and improved arrangements for the operation or control of reciprocating devices therein; to provide hydraulically operated driving means, suitable for the operation of such devices, and simple and eflicient in character; to provide dependable and efiicient hydraulically operated driving apparatus which is conveniently free from pistons, rotatingfvalves or like parts requiring a, sliding iit'under pressure and therefore having disadvantages of the character noted hereinabove; to provide improved liquid feeding apparatus as described, which is adapted to be driven b'y the force of liquid under pressure, and is conveniently free ample, areillustratedin the accompanying draw-v rupture of the diaphragm. Withthe present,v

t invention there 'disaclvantiatges' are` obvlated, so

and thus provide-'an "eillcient feeding device forwater pu'riziicationl systems or the like, whei'efk Fig-3 is a'vefrtical view of another form of it is in operation. As a result, the'diaphragm'weakens very soon, and

must be freiilifnt*` ,"replacedin order to have:y

of elements having the disadvantages of sliding fit as just explained; to provide apparatus improved in the foregoing or other respects,'which i is adapted to deliver the treating liquidV at a rate automatically proportional to the rate of ilow of the mainbody of liquid; and to provide new fand improved hydraulic, i. e. liquid-operated, driving apparatus, and new and improved con- .40 trol means for vsuch apparatus.

Other objects Vand advantages include those hereinafter stated or apparent in connection with the following. description of certain presentlypreferred embodiments of the invention. These embodiments, which are set forth by way of exings, wherein: f

Figure '1, is a vertical `view, chiey in section l complete breakdown bypermanent distortion or "50 along fa central vertical plane, of one form of st entalities and connections;

Fig. is'a vertical view of yet anotherr form f of apparatus, chiefly in section along a central vertical plane, with certain parts cut away;

Fig. 6 is a sectionall view on 'line 6-6 of' Fis. 5:

Figs. 7 and 8 are fragmentary sectional views of a portion ot the apparatusin Fig. 5, with oertain parts in respectively different posit1ons; and

fing diaphragm 20, provides what may be conveniently termed a balancing chamber 54 for the pump., Through an inlet port 56, water may be supplied to the chamber 54 from the main into which the treating. liquid is to be introduced. The line between the main and the port 56 may conveniently include a suitable strainer (not i shown) and a differential valve 58 (see Fig. 2).

Fig. 9 is a central vertical section of a modi'- fieclform of part of the apparatus. f It may be explained that the apparatus shown in these figuresl is conveniently adapted to withdraw treating liquid (e. g., hypochlorite solution) 'from a nearby tank, and to deliver desired quantities thereof into a water main where the pressure may be relatively high, for example, as high as 100 pounds per Square inch, or in many cases, considerably higher.

The apparatus of Fig. 1 includes a pumping element comprising a circular flexible diaphragm 28, advantageously made of resilient material, such as rubber. Against this diaphragm there is seated a block 22 having a circular recess 23 disposed toward the diaphragm, to provide a pumping chamber. Treating uid is admitted to the .latter through supply pipe 24, check valve 26,

and passage 38 in the block 22. -Delivery of treating fluid from the chamber is obtained through an outlet passage 32 in the block 22, a

-chek valve 34 and a discharge pipe 36which may be. connected to the water main (for exampless shown in Fig. 4)

The main supporting structure of the apparatus may comprise a casting 3,8, having a cup-like The head 46 is preliminarily clamped toward the member 40, so as to engage therebetween the members 48, 22 and 26, by moderately tightening up the nuts 50 on the studs 44. 'Through the center of the head 46, and threaded therein, there extends -a bolt 52 having at its end a projecting pin 53 -slidably engaging a corresponding aperture in the aligning member 48, but with a rather 'loose iit. c

In consequence, when the bolt 52 is tightened up, i. e., screwed in, by its handle as shown, the further pressure thereby exerted on member 48 at its center securely clamps this member toward the member-48, so as to lock the diaphragm 20 in place intermediate the block 22 and member 40, and effect a high pressure seal uniformly about the periphery of diaphragm 28 on each side of it. Thus diaphragm 20 is automatically accurately aligned with respect to members 22 and 46, and stress on the diaphragm is evenly dis-- tributed aboutits periphery, preventing distortion, or other irregular strain on the diaphragm,

as might otherwise contribute to its wearing out at localized points.

Theinterior recess of cuplike member 40, fac- The differential valve 58 may be of suitable known construction, adapted to provide a substantially uniform ow of water to the chamber 54 from the main. The valve here shown includes to that end, adjacent chambers 60, 60a, separated by a diaphragm 6| which carries a valve closure 62 for the inlet 63 to the chamber 60 andvwhich is biased toward open position of valve 62 by a spring 64. The chamber 60 is connected with the outlet 65 and with the chamber 60a through an orifice 66 which is adjustableI by means of the threaded member 61. As will `is substantially constant, and in consequence, the

iiow through orifice -66 is substantially constant for any given setting of member 61, irrespective of variations in pressure at the inlet 63 or the outlet 65.

The diaphragm 20 has at its center a supporting boss 10 secured to a closed end of a tubular member 12. The tube 12 is supported by, and longitudinally slidable 4in a sleeve 14 mounted in member 48 opposite the diaphragm. Opening near the top of the balancing chamber 54 so as to avoid entrapment of air in the latter, an outlet port 16 extends downwardly from the chamber to a cylindrical recess 18 surrounding the tube 12;

suitable packing being provided about the tube, next to the sleeve 14, to prevent leakage of water from the recess 18. The tube 12 has oppositely disposed ports or ' openings 82, 82, at the portion thereof which is adjacent the recess 18, these ports being so arranged that one or more of them is always'open for access to the recess 18 throughout the stroke of the tube 12, as hereinafter explained. l

A housing 84 is secured to the outer end. of the tube 12,` and carries in an appropriate supporting sleeve, a slidable shaft 86. spaced beyond and in axial alignment with the tube 12. Shaft 86, when moved to the left relative to the housing, causes a conical valve member 88 toseat into the adjacent endof tube 12, thus providing a valve closure for the latter. Member `88, by

virtue of its supporting pin 8U loosely carried in a. cooperating recess in shaft 86, is self-aligned relative to the end of the tube. It will be understood that the shaft as is 1ongitudma11y sudable relative to the housing 84, but that its displacement to the right (relative to the housing) is' limited by the engagement of a shoulder 92, on

shaft 86, with the inner face of the supporting.

sleeve in the housing 84. Thus when the shaft 86 is moved to the right, the vvalve 'is permitted 12, and the center of diaphragm 20, the parts being here illustrated in the position so assumed upon movement of shaft 86 to the right.

The outer end of shaft 86 is pivoted to the upper arm 84 of a bell crank lever which rocks about a shaft 96 (carried by the main frame 38,

. the eccentric I I0,

tion along this slot, is a bearing |02 k(the adjustable securing meanslcomprising the bolt |04 passing through the slot and the cooperating wing nut |06, 'see Fig. 2) for the outer end of a connecting rod |08, connected to be reciprocated by an eccentric |I0. The box or housing ||2 contains an electric motor and suitable gear- 'ing (of conventional form and hence not shown),

arranged to rotate the eccentric I at the proper speed for desired operation of the pump, as in the manner now to be described.

Assuming that the parts are in the position shown, and that the stated connections have been made to the water main and to the supply of treating liquid, the apparatus is adapted to operate as follows: Water is constantly flowing in through the port 56 to the balancing chamber 54, and thence on out through port 16, recess 18, holes 82 and tube 12 (valve 88 being now open) to waste (i. e., dropping into a suitable collect- A ing basin,||4 in the lower part of the casting 38, having an outlet 6).

At this point of time, the motor drive, through connecting rod |08, and bell crank lever 94--98,l is such thatthe shaft 86 is in its extreme right hand position. Continued operation of 4the motor drive thereupon com- ,mences to displace the shaft 86 tothe left. As

previously explained, valve 88 ilrst` closes, and shaft 86 then pushes the entire assembly, including housing 84, tube 12, and the center of diaphragm 20, to the left. Simultaneously, upon closure of valve 88, water very rapidly backs up in the balancing chamber 54, promptly illling the latter, and for the remaining part, i. e., nearly all,

ofthe leftward stroke of the assembly, force is exerted to the left on the exposed portion of diaphragm 20, by the water flowing constantly into the chamber 54 from the main.

The consequent displacement of the diaphragm to the left will therefore expel Vinto the main, throughiport 32, check valve 34 and line 36, the charge or slug of treating uid which will be assumed to have been previously drawn into the pumping chamber 23 from the supply tank for y such treating fluid or reagent.

It will now be appreciated that even. though the pressure in the main may be relatively high, e. g., 100 pounds per square inch or more, the-force which the motor driving mechanism 'must exert on the reciprocating assembly including tube 12 may at least be very greatly supplemented by the Waterwhich backs up in the balancing cham- -ber 54, and which continues to ilow into the latter, so as to cooperate directly in displacing the -diaphragm 20 to the left. Indeed, beyond mechanical friction in the various elements, the force exerted by the electric motor need only be suillcient, on the leftward or pumping stroke, to hold the valve 88 closed, and to compensate for such inequality of forces on the diaphragm 20 as may be occasioned, for example, by the lesser eiective area of the latter on its balancing chamber side. (because the tube 12 is connected to that side ofthe diaphragm). In general, the water is preferably admitted to the balancing chamber at a pressure substantially equal to that of the main, and thus substantially equal to that at which treatingliquid must be expelled from the pumping chamber 23; and so far as the above-mentioned diiere. l.e in eifective diaphragm area may cause the water in the bal- 10 ished rocking to the l5 housing 84 ple, with an apparatus ancing chamber to exert' less force than is necessary for pumping, it will be atmost only a little less. Hence ordinarily, in .addition to the mechanical resistances mentioned above, the motor 5 need overcome substantially no more than the little difference in force Just mentioned, in order to accomplish the pumping action.

When the leftward stroke is completed, i. e., 4when the motor driven bell-crank'arm 94 has 1inleft and begins'its return stroke, its initial return movement withdraws shaft 86 to the right with respect to housing 84, allowing valve 88 to open; shoulder 92 of shaft 86 is then pulled `back against the sleeve in the and the continued '.rocking of the arm 94 to the right carries housing 84, tube 12, and the center of diaphragm 20 back to the voriginal right hand position. Throughout this return stroke, valve 88'is open, and the water 2d admitted to the balancing chamber through port "56 merely flows idly through the chamber and out through the tube 12 to waste, so that no force is exertedfrom the balancing chamber upon the diaphragm, to impede its free displacement 25 to'the right. During phragm to the right, by the return stroke of the assembly, a fresh charge vor slug of treating fluid! displacement of the diais sucked into the pumping chamber *23, through Aline 24, check Valve 26-and inlet port-30.

It will be appreciated that on this return stroke, the Work of the motor is substantially the same as on the pumping stroke, except that instead of supplying any deficiency of. pumping force on the diaphragm 20,

ber 23 with ajfresh slug of treating liquid. Ordinarily,` for example, the treating liquid need only be drawn up from a nearby tank or tub, in which it may-conveniently be mixedor Imade up, from eccentric ||0 and associated instrumentalities thereupon carry the assembly through the pumping stroke to the left, in the manner previously 5 described, and through another `return stroke; and the reciprocating pumping action thereafter automatically continues in the same way.

As stated above, the apparatus requires very littlefpower from the electric motor, for examL of the sort here shown, a small 11G-volt shaded-pole motor, drawing 25 watts and delivering less than 2 watts, is sutilcient to deliver gallons of reagent during 24 hours, at a pressure of pounds per square inch; whereas with diaphragm pumps of other types, lacking the balancing arrangement here shown, a much larger motor, such.as a'standard V4 H. P. motor drawing 250 to 300 watts and delivering about watts, would be required to 'obtain the same output of treating liquid. Fur- 0 thermore, the arrangement provides a tremendousl conservation of the life of the diaphragm. As explained hereinabove, when the usual type of diaphragm pump is called upon tooperate at 5 high pressures, great strains are vset up in the diaphragm, resulting in violent. exing and bulging at every stroke, and usually in irregular fashion or at localized points. The rubber or other diaphragm material rapidly weakens and soon ruptures or stretches, so that frequent replacement is necessary. In the present apparatus,

however, by virtue of the balancing chamber'54 and cooperating instrumentalities, strain in the plane` of the diaphragm is greatly minimized. and

the motor must exert the usually 35 slight force necessary to fill the pumping chamis that of pressure exerted transversely thereof, i. e., perpendicular to its surfaces, with the result that there is very little wear of the diaphragm material. At the same time, the clamping arrangement including the aligning member 48 cooperates to keepthe sealing and clamping stress uniform throughout the periphery of the diaphragm, avoiding irregular localized strain which has contributed to the aforesaid disadvantages of pumps hitherto available.

The described apparatus, therefore, is both simple in structure and highly dependable in perfomance. The quantity of reagent delivered through the output line 36 can be varied as desired by adjusting thevposition of the connectingy rod bearing |02 with respect to the lower arm 98 of 4the bell crank lever, i. e., by moving the supporting bolt up or down in the slot so asto lengthen or shorten the stroke of the pump. For convenience in adjustment, the outer face'ofv the arm 98 maycar'ry a suitable scale ||8 relative to which the assembly |02|04|06 may be adjusted, and indicate the rate of delivery by the pump.

The apparatus of Figs. that of Figs. 1 and 2 in a number of respects, but differs in that the drive of the pump is here effected by hydraulic means, viz., by an arrangeof the treating uid ment operating as a water motor in lieu of the electric motor drive of Fig. l; and the arrangement in Figs. 3 and 4 is also such that the de.

' livery of treating fluid is automatically varied in proportion to variations in the rate of flow through the main to which the treating fluid is supplied andV from which the water motor may be driven. i

The input and output lines and check valves for the diaphragm pump, and the diaphragm sealing and clamping means, are identical with those oi' Fig. 1, andhence are not shown in Fig. 3. The supporting frame |38 includes a recessed part |40 identically corresponding in function with the cup-shaped portion 40 of the frame 38 in Fig. 1. That is, portion |40 encloses a balancing chamber |54 on the right-hand side of diaphragm 20, the latter being seated against an annular ilange |42 on member |40, as in the previously described apparatus. The water input port |56, and the input differential valve |58 (to which water is supplied from the main |59, Fig. 4), as well as the water output port |16, for the chamber |64, are likewise identical in function with the correspondingly numbered parts in the apparatus of Figs. 1 and 2. Likewise, the output port |16 leads to a cylindrical recess |18, for conducting water to the interior of the tube |12 through the apertures |82 in the latter. The

ltube |12 is secured at its left-hand end to the center of the diaphragm 20, andv is longitudinally slidable through a sleeve |14 having appropriate packing |80 to prevent leakage of water from the recess |18.

A bracket |84 is associated with of tube |12, to provide a valve arrangement for the end of the tube, as in thecase of the housing 84 in Fig. l. This bracket or frame |84 is carried by a cross member |85, which is horizontally slidable, and supported, upon pins .|86, |86, at

the sides of the apparatus (see Fig. 4). A coil` spring |81, disposed upon the tube |12 intermediate frame |84 and sleeve |14, is adapted to urge frame |84 to the right as seen in Fig. 3..

'The frame |84 carries on an inner face opposite the end oi tube |12, a valve-closing disc |88,

which may be calibrated so as tov the outer endA Vconveniently made of resilient material.

The tube |12 is slidably supported by frame |84, and has its open end disposed for cooperation with the valve disc |88, so thatif the frame |84 is displaced to the left from the position shown (relative to the tube |12) it will bring the disc |88 against the open end of tube |12, closing the latter, as in the case of the valve arrangement 88 in Fig. 1. Thereupon further displacement of the frame |84 to the left will serve to displace the tube |12, and associated parts, in the same direction. Displacement nf the frame |84 relative to the tube |12, toward the right, will, of course, open the valve |88, but relative displacement of the parts in this direction is limited by a rearwardly facing shoulder |90, at the end of the tube |12. which engages an inner face |92 of the adjacent portion of bracket |84. Thus after bracket |84 has moved suiliciently to the right to open the valve |88, further displacement of bracket |84 to the right will effect" the same displacement of tube |12 and associated parts.

The bracket |84 has a rightwardly extending portion (as seen in Fig. 3), terminating in a cir- 3 and 4 is identical with cular head |94 which is secured to the center of a circular diaphragm |96, the latter being peripherally clamped intermediate a supporting vrim |98, conveniently integral with the main frame |38, and a head 200 having a cup-shaped recess 202l in its inner farce toward the diaphragm, to provide therewith a driving or hydraulic motor chamber, as presently to be explained.

The member |94 is clamped to the diaphragm |96 by a threaded bushing 204, into which there is in turn threaded al bushing 206 having its inner end adapted to provide a seat for a valve disc 208 (comprising a resilientwasher backed by a suitable supporting disc, as shown); the valve disc 208 being carried b y a pin 209 which is slidably supported in, and extends beyond the portion of bushing 204 that projects on the opposite side of the diaphragm from the motor chamber 202. The interior of bushing 204 is adapted to communicate with the interior of bushing 206, and through the same to the interior of the driving chamber, when the valve 208 is opened (valve pin 209 being then slid to the left), so that water may pass from the chamber 202 through the parts just described, and out to waste, through suitable ports 2|0 in the outer or left-hand portion of bushing 204.

Water is continuously supplied to chamber 202 through an input port 2|2, from the water main |59 (Fig. 4), and a differential valve 2|3, similar to that shown at 58 in Fig. 2, is conveniently provided in this supply line for like reason, i. e., to provide a substantially constant flow of water to the supplied chamber.

Journaled in a suitable bracket carried by the member 200, is a cam 2|4, which is adapted to be driven by shaft 2|6 from a water meter 2|8,

of any suitable construction, interposed in the main |58 into which treating fluid is tov be in- -jected (see Fig. 4). A cam follower 220 (conveniently a rol1er)`carried by a rocker arm generally designated 222 engages the surface of cam 2|4, the rocker arm being pivoted at 224 to a portion of the traveling frame |84. The rocker arm 222 is preferably made in two parts separately pivoted at the point 224, and respectively comprising an upper .or cam-following part 226 and a lower part 228. The lower part, as shown in Fig. 3, has an upwardly projecting portion 230 which is adapted to engage the right-hand surface of the upper part 226, and upon such encarries a nat-spring 232 whichextends. down and engages the lower portion 228 near its lower nd, and normally'keeps the parts in the position shown, with the portion 280 engaging part 226, so that the assembly constitutesjin effect a unitary member, and the two parts canV only be moved relative to each other against the pressure of spring 232.

The lower end of the part 228 of the rocker arm is adapted to abut the outer or left-hand end of the pin 209 whichis shiftable to close the valve 208, andit will now be` seen that opening or closing of this valve may be controlled by relative displacement of the rocker arm' part 228 and the diaphragm |98.

It will now be understood that the operation ofl the pumping portion of this apparatus is essentially the same as that of the corresponding apparatus in Fig. 1. 'Assuming that a charge of. treating liquid has been drawn into the pumping chamber |23 from a supply tank 233 (Fig. 4),

. and that the driving mechanism (operatedin the manner presently to be described) is commencing to move the frame |84 to the left (see Fig. 3), the valve |88 is first closed, permitting water from 'the main to back up in the balancing chamber |54; and thereby setting up balancing force on the diaphragm 20. Further displacement of` member or' frame |84 to the left carries the diaphragm 20 correspondingly to the left, with the In consequence, the diaphragm |98 exactly follows the rise of the cam;

i. e., the diaphragm is displaced in exact proportion tothe rate at which the cam, as it rotates.

moves the follower 422|) to the left. The diaphragm |98 cannot be displaced ahead of the cam, so vto speak, since the resulting relative placing force on the diaphragm, as previously explained.

It win `thus be seen that displacement of the diaphragm |98 to the left, by reason of the force Vexerted by the water` flowing into chamber 202,

is exactly controlled by the speed 'of rotation of theI cam 2|4, and in particular'by the rate at which the follower 220 rides up to a high spot of the cam (whereby the rocker arm tends to close the valve 208-al1 of the time). Indeed, since the work to be done by the diaphragm |98 in moving gtheframe |84 and associated parts `to'the left rangement lhere shown differs from that in Fig.

l, however, in that the return stroke is accomplished by the force of spring |81, and in that, in consequence, spring. |81 must be compressed during each pumping stroke.

`With the-apparatus of Fig. 3, the described reciprocation of frame |84 and its associated pumping instrumentalities, is achieved as follows: Assume that'the parts are in the position shown, ready to commence a pumping stroke. The diaphragm |96is in its right-hand position, the followerl 220 is on a low spot of the cam 2|4, which is rotating infa counterclockwise directionas seen in Fig. 3, and the lower end of the rocker arm' 222 is therefore in such abutment with the end of pinV 209 as to close the valve 208 against its seat in the'bushing 206. In consequence, with the outlet to the motor chamber 282 thus closed, the water flowing into the chamber commences to displace the diaphragm |98, and itsattendant parts, to` the left. This tends to displace the vframe |84 correspondingly ,to the left, similarly tending to move the vpivotv 224 of the rocker arm 222 and thereby to rotate the latter in a clockwise direction about its pivot 224 (if the upper end The cam- 2|4, however, is rotating and as yits rise tends to move the`uppe'r end `of the rockery arm222 counterclockwise, the lower end of the to carry out a pumping stroke is relatively small (as explained above), the ilow of water into chamber 202 from the main-may always be e greater, and is usually considerably greater, than necessary to displace the diaphragm |98 at the rate prescribed by'the cam 2|4 As a result, in normal operation of the device, the rocker arm 222 only keeps `valve- 208 sumcientlyclosed to provide the actually necessary displacing force on the diaphragm |96. so that during the entire pumping stroke, the valve 4may thus be automatically cracked or slightly opened, all the time, to the extent necessary topermit the excess water to flow from chamber 202. It-will also nowv be appreciated that in normal operation during the pumping stroke the position of rocker arm 22,2 relative to the frame |84 does not change at any time, since the displacement of the upper end of the rocker arm by the cam 2|4 is exactly paralleled at the lower end of the arm by the resultingv or following displacement of diaphragm |96, in the manner previously explained.. In effect, moreover, the action of the cam and rocker arm is that of a governor or controlling element,-v since the only -work required of `these instrumentalities is the negligible amount necessary to keep thel very small valve 208 (which is otherwise freely slidable) closed to the required extent, i. e.,

against a correspondingly very small proportion of the small force actually needed to be exerted bythe liquid in chamber 202.

The diaphragm |96 thus moves to the left at a rate determined by the rotation and characteristics of cam 2|4, and correspondingly displaces the frame |84, and its-attendant pumping instrumentalities, to carry out a pumping stroke of diaphragm 20 in the manner hereinabove described.`

When the cam follower 220 reaches a high point of cam 2|4 and drops suddenly to a low point, travel of the diaphragm |96 tothe left is interrupted (since the rocker arm 222 does not then keep the valve 208 closed), and the pumping stroke is thereby terminated. The valve-208 being then open, pressure isy relieved in the motor or driving chamber 202 (the water merely passingl through the bushings 208- 204, and ports 2 I 0. to waste), and the spring |81 then carries the traveling frame |84 and its attendant pumping and driving instrumentalities allthe way to vthe right, accomplishing the return stroke and draw.y I

Vdiaphragm-displacing force exerted by the water in the chamben 202.

shortens `or increases the pump stroke.

ing a fresh |23. l

Thereafter, as soon as the rise of the cam begins to urge valve 208 closed (the cam here shown slug of treating Ifluid into chamber being adapted to do so at once, for maximum length of stroke), the cycle of pumping and return strokes is automatically repeated.

In the right-hand wall of chamber 202 there 4is disposed a member 234 mounted to slide horshaft 240, to prevent escape of water from theI chamber 202. and the outer end of the shaft 240 is appropriately urged to the right (for maintaining it in place relative to the member 234 to be displaced by rotation of the shaft) by spring 244 intermediate the member 200 and a collar 246 which'is secured to the shaft 240 and which may carry a pointer 248. It will now be understoodthat upon rotative adjustment of the wheel 238, the stop 234 is moved to the left or right,

cut as to have a gradual rise to each high spot and a sudden drop therefrom, thus affording a long pumping or delivery stroke and permitting a correspondingly rapid return stroke, and in consequence providing a delivery of treating liquid which very closely approximates a continuous flow, except in so far as the beginning vof the pumping stroke may be delayed in time by adjustment of the wheel 238 so as to shorten the stroke more or less from the maximum limit ordinarily corresponding to the low points of y Ifv for any reason the supply of water to chamber 202 should be interrupted, while cam 2|4 is being rotated by the water meter, the hinged construction of the rocker arm 222 will serve to prevent any damage to the delicate parts of the water meter. The upper part 226 of the rocker arm will then merely be ipped counterclockwise relative to the lower part 228 (against the spring 232), each time the rise of the cam carries the follower 220 to the left. The hinged arrangement of the rocker arm will also avoid damage thus decreasing or increasing the distance which the frame |84 (carrying the stop-engaging bushing 206) may cover in its travel to the right from the leftward limit oi' its pumping stroke (as determined by cam 2|4), and thus shortening or lengthening the stroke of the pump; means are thus provided for adjusting the pump delivery by altering its length of stroke within the limiting positions dictated by the characteristics of the rotating cam 2 I4. In the drawings, the parts are shown adjusted for maximum length of stroke; adjustment of stop 234 to the left will shorten the stroke and delay the time at which the cam begins to eilect leftward displacement of diaphragm |96 after lthe completion of a return stroke.

A suitable dial 2'50 may be provided for the pointer 248, and appropriately calibrated for the variations in pump delivery corresponding to various positions of the stop 234 as adjusted by the wheel 238.

It mayhere be noted that the cam 2|4, in order to exercise its described control, need exert very little pressure upon the follower 220. Hence a properly flow-responsive water-meter (which in the ordinary'type of construction employing rotating vanes or buckets, is a device not adapted to develop any substantial amount of power) may be employed to rotate the cam 2|4, which directly regulates the speed and frequency of plained.

It will now be seen that in view of the control exerted by cam 2|4 as driven by a water meter or like device which has its speed of rotation necessarily proportional to the flow of water in the main, the delivery of treating liquid by the pumpingy diaphragm 20, over a given period of time, will be directly proportional to the flow in the main, i. e., will vary in direct proportion to variation in that ow. The amount of treating liquid which is delivered at eachstroke of the pump,` and thus the rate of delivery over a given period of time, is manually controllable by operation or adjustment of the wheel 238, which Y It will also be noted that the cam 2|4 is preferably so to the cam or water meter if at any other time, whether the cam is rotating or not, such pressure is exerted on the rocker arm ,as might otherwise cause the follower 220` to exert excessive force on the cam. It will be understood, ofcourse, that the spring 232 has enough strength to prevent mutual displacement of the rocker arm parts 226, 228, during the vintended normal operation of the apparatus as previously described-'- i. e., normally, there is relatively'little force exertedon or by the rocker arm and it acts as av single member. I

The apparatus shown i'n 3, therefore, provides a simple and` convenient hydraulically operated feeding apparatus which is adapted to deliver a flow of treating liquid that automatically varies in direct proportion to variations in the flow of liquid in the main. 'I'he powerrequired of the hydraulic driving means is very small, and as in the case of Fig. 1, the diaphragm-balancing means may provide at least the greater part of the liquid-expelling force on the diaphragm 20. y f i Like the apparatus of Fig. 3, the form of device shown in Fig. 5 is provided with a pumpingv chamber |23, pump diaphragm 20, inlet and out-A let lines for treating liquid, and diaphragm aligning means, identical with those in Fig. l; and it will be understood that the portion of the apparatus which would extend to the left of the the pumping strokes of the apparatus, as exbroken line in Fig. 5 is the same as in Fig. 1.

Similarly, the apparatus of Fig. 5 is provided with a balancing chamber |54, traveling frame 184, valve |88, pump-operating tube |12, spring |81, and associated parts constructed and functioning in exactly the same manner as correspending parts in Fig. 3. Likewise as in the case of Fig. 3, the traveling frame v|8|l here has a rightwardly-extending portion terminating in a head |94 bolted to the central portion of a driving diaphragm |96, which encloses a driving or motor chamber 302 provided by a corresponding cup-shaped recess in the housing member or frame 304. 'I'he chamber 302 has a Water inlet port 306, and a water outlet port 308, it b eing understood that in this form of the apparatus the assembly comprising the diaphragm |96 and its associated head |94 and securing parts is imperforate, there being no outlet for the water through the diaphragm as inthe case of the apparatus in Fig. 3. l

The outer end of the Water outlet 308 is adapted aasaaaa to provide a seat 4for a valve disc 3|0 of resilient material carried by a -lever 3|2. which is pivoted .disc 3|0 againstthe port 308 and prevent escape of water from the chamber 302. Referring also toV Fig. 6, the upper end of the lever3|2 is forked, and the ends of the fork are adapted toabut (on the other side of .the member 3|2Iromtheva1ve disc 3|0) against an annular plate 3|4 carried by a diaphragm 3| 6 which encloses a control chamber 3| 8 recessed in the member 320; the diaphragm 3|6 being peripherallysecured between the member 320 and a cooperating annular portion ofthe frame 304.`

Thediaphragm 3| 6 is pierced by a bushing or tubular member 322, adapted for passage of water from the `chamber 3| 8 to the other side of the diaphragm, and thence to `waste through outlet 323. The outer or left-hand end-of the bushing 322 is adapted to provide a seat for a resilient valve disc 324 carried by a pin 326 which is slidably mounted and aligned in a transverse block 321 in the bushing. As shown in Fig. 6, this block does not interrupt flow of water through the bushing 322 when `.the valve (constituted bydisc 324 and the endof` the bushing)y is opened, and the vvalve pin 326A is freely slidable `in the block, to

permit opening or closing of the valve.` The outer surface of the valve disc 324 is providedwith al suitable `metal face and the assembly is adapted to be engaged on that side by the end of a controllinghrod '328. A spring 330 interposed between theannular member 3|4 carried by the diaphragm and the frame 3,04,` normally urges the diaphragm 3|6 to.itsfright hand position shown, so that the member` 3|2 may then rock b a-ck, with itsupper forked extremity resting upon the annular member. 3| 4, and thus permit the valve 3|0 to open.` The control rod 328 is valve 324is intended to be open, and by bleeding through this valve at other times.

It will be understood that port |56 is connected with kthe water main through a suitable differential valve as previously explained in connection with the supply of water to the balancing chamber in Figs. l and 3."It will also be understood that the operation of the pumping and diaphragm-balancing instrumentalities, upon reciprocation-of frame |84, is` the same in the apparatus here shown as in the case of Fig. 3, at the beginning of each pumping stroke valve |88 is closed so asA to build up balancing force in the chamber |54, and at the end of each stroke the valve is permitted to open by preliminary movement of the `frame 84 to the right, so that as' y the 'spring |81 thereafter carries the entire assembly to the right, there is no balancing force exerted by chamber |54 and a rapid return stroke is achieved. The operation of the hydraulic motor of `this form of apparatus, whereby the frame |84 is positively driven to theleft to provide the pumping strokes, will now be described.

It may be assumed that the pumping apparatus has just completed a `return stroke to the right, and the parts are consequently in theposition shown in Fig. 5, with the valve 3|0 open andgno I displacing forceV beingexerted upon "diaphragm supported ansfreely horizontauy slidable in'a bushing 332 at theend of a tube 334 which is secured to a leftwardly extending portion of the frame 304 as shown in Fig. 5.

The outer left hand end of the rod 328 has a l reduced portion 336 so asy to provide a leftwardlyfacing shoulder 338 vwhich is adapted to abut a washer 340, the latter being freely slidable upon or relative to the reduced portion o'f the rod. The left hand extremity of the reduced portion of the rod 338 is freely slidable in, and supported by, a bushing 342 carried by an upwardly extending support 344 which is secured to, and dis- `placeable with, thepump-operating vframe |84.

The bushing 342 is seatedA partly into a cylindrical recess 346 formed in member 344 and surrounding the operating rod` 328-336, and within this recess there is disposed a springr 348 whi-chis seated against the inner' face of the bushing 3 42 andis adapted to urge the washer 340 to the right against theshoulder 338 of the l rod 328. or against an inwardly extending shoulder 350 near the right hand end of the recess, depending, as willpresently be explained. UDCH the position of the assembly. IBA- 344, relative to the stationaryportion ofthe apparatus.

Inlet of water to the control chamber als is provided through a port 352, conveniently connected to themain through a reducing valve of suitable knownconstructio'n (not shown),` so as to reduce thepressure to no more than that needed for proper rapid action of the control chamber as hereinafter explained, and so that waste of water' is avoided, both directly when washer 340 into such engagement with the `shoulr der 338 of rod 328 that the rightl hand end of the rod is pushed against the valveV disc 324, closing the valve as the shoulder 350 'tends to move ahead, and clear, of washer 340. Thereupon the water which is flowing into Athe small control chamber 3|8 (and which has previously been escaping through bushing 322) immediately exerts displacing force upon the diaphragm 3|6 and moves the latter to the left. This movement of the `diaphragm 3|6, against spring 330, moving rod 328 to the left'ag'ainst spring 348, is preferably so rapid as to be almost instantaneous.

The effect of so displacing the diaphragm 3| 6,'`

and, in consequence, its ring 3|4, rocks the arm 3|2 to the left, closing valve 3|0 and keeping it closed; the rapid movement of the diaphragm l thus providing a snap closing action for the the valve 324` closed, so as to'maintain the diaphragm 3|6 in its displaced position, and thereby to keep the valve 3|0,c1ose h The water now flowing into chamber 302 thus continues to displace to the-left the diaphragm |06, and the attendant pumping instrumentalities operated by frame |84, for thepurnping stroke.` At the same time, the member 3244 is moving tothe left relative to the rod 328,and

eventually the washer 340 (urged to theright'` by the spring 348). comes into engagement ,with shoulder 350. The. pressure exertedv upon the rod 328 is thereupon immediately released,l and since the closing pressure on valve 32.4 isconsequently and :by the same token released, this valve opens itself, and the diaphragm 3|'8 immediately jumps back to its original position (shown in Fig. sincen'o displacing force is relieved and the water flowing into chamber 302 passes on through ports 308 and 323, to waste.

The force of spring |81, compressed during the pumping stroke, now carries the pumpoperating instrumentalities to the right for the return stroke, as in the case of the apparatus shown in Fig. 3. At the same time, the rod 328 is now free and loose, because of the space left in iront of it by the return of diaphragm 3|6, and remains free and loose during the entire return stroke. The positions of the left hand end ofthe rod and of the parts carried by member 344, just after the commencement of the return stroke, are shown in Fig. 8.

Eventually, however, the washer 340, held by shoulder 350 during the return stroke, again engages the shoulder 338 of the rod 3 28 and pushes the latter against the valve disc 324. This constitutes the end of the return stroke, since the parts now repeat the operations previously described-i; e., with valve 324 closed, diaphragm 3|6 jumps to the left, valve A3|0 is closed, and pressure begins to build up in chamber 302, commencing another pumping stroke. The cycle of. pumping operations thereupon proceeds as before. f

It will be seen that the arrangement shown in Figs. 5 to 8 inclusive provides a simple and convenient hydraulically operated liquid feeding apparatus, wherein the control of water supply to the driving chamber 302 is automatically positively exercised at the desired points in the travel I of frame |84, to initiate the pumping and return strokes respectively-i. e.. the control in each direction being exercised in response to" arrival of the member |04 at the position at which the diaphragm 3|6, rod 328 and associated instrumentalities are adapted to effect such control. It will be noted, moreover, that as in the case of Fig. 3, the apparatus of Fig., 5 is elciently adapted, because of the Arelatively very rapid return or suction stroke effected by the spring |81, to approximate closely a continuous feed of treating liquid into the main.

A particularly convenient way of controlling the delivery of the pump in this form of the apparatus is by adjustment of the diierential .valve which may be provided in the supply line between the main and the motor chamber inlet 306. It will be understood that such valve, which is adapted to provide a substantially constant flow as in the case of valve 58 (Fig. 2), should preferably have a wide range of adjustment, so that the rate of flow into the motor chamber may be correspondingly adjusted over a wide range and substantial variation of pump delivery obtained as desired. Thus upon increase or decrease of the ilow into the motor chamber 302, there will be respectively a decrease orincrease in the duration of the pumping stroke, to expel the same unchanged amount of treating liquid, and in consequence, over any period of time,

lar to those shown in the other gures and are adapted to operate in the same way. The diaphragm 20 is reciprocated by a rod 500 adapted to slide horizontally through a suitably packed bushing 502, and is pivoted at its cuter or right hand end to an intermediate point of a lever 504. The upper end of this lever 504 is pivoted to a connecting member 506, which may be driven by a reciprocating element such as the rod 86 in Fig. l or the frame |84 in Figs. 3 and 5. The lower end of lever 504 is pivoted to a rod 508 carrying a pair of valve cones 5|0, 5|2, adapted to seat in corresponding orifices, arid to be alternately closed as the rod 508 is reciprocated to the left or right. Y'I'he valve 5|0 is interposed in the water input line 5|4 for the balancing chamber, and the valve 5|2 is adapted to control' an output port 5|6 through which water from the balancing chamber may flow to waste. A portor conduit 5|8 connects the interior of the balancing chamber 454 with both of these valves 5|0, 5|2, as shown.

Assuming that the parts are in the position shown, and that the members 500-506 have just completed a return or suction stroke to the right,

displacement of member 506 to the left, for the commencement of a pumping stroke, will first rock lever 504 about its central pivot. So rocked, the lever 504 shifts the valve rod 508 to the right, closing valve 5|2 (previously opened) and opening valve 5|0 (previously closed). Thereupon water is admitted through line 5|4, valve 5|0, and port 5|8 to the balancing chamber 454, and immediately 'builds up balancing force on the diaphragm 20, since the output from the chamber, i. e., through valve 5|2, is now closed. At the same time, since the cone of valve 5|2 is now seated against the bushing 5|6, further drive of the member 506 to the left can only rock lever 504 counterclockwise about its lower pivot, thus displacing member 500 (and inconsequence diaphragm 20) to the left for a pumping stroke.

Upon the completion of the pumping stroke,

and when member 506 begins to return to the right, the rod 508 is again reciprocated, closing valve 5|0 and opening valve5l2, and thereafter, since the cone of valve 5|0 is seated against its cooperating bushing further displacement of member 506' to the right serves to displace likewise the rod 500 and the diaphragm 20.. During this return stroke, as will now be seen, n o balancing force is exerted on the diaphragm by water in the chamber 454, since the port 5|8 is connected to thev outlet through the valve 5|2 (now open). At the end of the return stroke, the cycle is repeated in the same manner.

The arrangement shown in Fig. 9 thus affords a positive and effective valve control vfor the diaphragm-balaneing chamber, and serves to cut ing flow into andl through the balancing chamb'er at times when load-balancing force is not required.

therev will be a corresponding increase or def It will now be appreciated that the present invention, as illustrated `.by the various embodiments thereof hereinabove described, well attains its stated objects, and affords liquid feeding apparatus whichis especially rugged, dependable, long-lived and so simple to use that unskilled persons may readily supervise Aits yoperation and make any necessary adjustment of its rate of delivery. The efllciency of the apparatus is high ciiically illustratedh'as been'described--as emthroughout, and parts which have va. rotating or other necessarily stiff sliding tand. upon which pumping accuracy depends maybe, as they are `in the described embodiments, satisfactorily eliminated; for example, all of the described` control valves in the forms shown `arein'eiect friction-free; and are generally, and toV like adl` vantage, self-opening upon release vof theassociated control element in each instance. The

arrangements are also such as to attain a high l0 vdegree ofefficiency, accuracy and reliabilitywith a diaphragm pump in whicn only aminimum of working parts need be exposed tothe treating liquid, and which is in that and otherv respects so `constructed that all elements exposed to such l5 liquid may, if desired, be readily'and effectively made of a material resistant to attack by the liquid.

It is to be noted, that whlle the apparatus spe-I ploying a balancing force on the. diaphragm opi posite to the pumping surface, which lssubstan-r tially equal-to the force requiredvfor pumping,

' but is in fact slightly'lless the latter, it isv f a separate liquid supply -of higher pressure than 30 that ofthe main into which treating liquid is to be fed, or if an orificeis used in the main to produce a yfriction loss and the balancing water is v taken at a point aheadof. the orificel and the treating liquid injected belowthe orifice, the bal- 35 i ancing force may" exceed that'needed for pumping and no liquid-expelling Yforce may be required of. the diaphragm-driving or 'reciprocating instrumentalities which serve to control thefbalunderstood that in some cases satisfactory rei sultsmay be had when the balancing force is very considerably less than the required pumping force; and also when it is considerably 4 greater.

` In accordance` with the provisions ofthe patent statutes, I have herendescribed the fprinciple of operation of my invention, together with the apparatus which I now consider to represent 5o the best embodiments thereof, but I desire to Ihave it understood that the apparatus disclosed is only illustrative and thatv the-invention can be carried out by other means. Also, while itis' del' signed to use the various featuresand elements 55 in the combinations and relations described, some of these may be altered and others omitted and the appended claims.

This application is a division my co-pending application SerialNumber 140,813, filed May 5, 193'?, for Liquid feeding apparatus, now ma- 65 tured into Patent No. .2,229,038 granted January Iolaim: i 1. In proportional feeding apparatus for feeding material invproportion to'a controlling fluid 70Av flow, -in combination, a reciprocably operated feeding device including a driving element therefor,v hydraulically operated means including an expansible chamber adapted to receive `liquid direction, said expansible chamber having passage means for supply and escape of liquid, valve means for the passagemeans and for thereby controlling establishment of liquid pressure in the chamber by liquid supplied thereto, to control the ,hydraulicallyoperated means, control means for the valve means. including a control device opf erated directly by and in accordance with the controlling iluid ilow,and means controlled by said control device for repeatedly operating the valve means to establish liquid pressure in the cha1n i vberl and thereby initiate operation of the hydraulically operated meansin said direction repeatedly at a flow-proportioned rate of repetition,

said valve-operating means'including means controlled by the control'device and the driving element and effective upon each movement of said driving element to a predetermined position for interrupting pressure-establishing operation of the -valve-operating means, and thereby to interrupt operation of the hydraulically operated, means. and returning means for displacing the driving element` in lthe opposite direction upon.

each interruption of operation of the hydraulically operated means. 4

2. In proportional feeding apparatus for feeding material in proportion to a fluid flow, in combination, a reciprocably operated feeding device, and reciprocating means for operating the device; including hydraulically operated means comprising an expansible chamberadapted to receive liquid under pressure, for displacing said device vin one direction, said expansible chamber having passage means for supply and escape of liquid,

'valve-means' for the passage means, displaceable `to control the operating effectiveness of liquid supplied to said chamber `and thereby to control the hydraulically operated means, and means for erating l ancing` chamber valve or thespeed, frequency or -40 op the va' ve means' to bring the hydra length of pumping strokes. Of course vit will be lically operated means intov play during successive periods,v including a now-responsive device controlled by the aforesaid fluid iiow, and means controlled by said flow-responsive device and by said hydraulically operatedV means and in accordance `withrlisplacement of the latter, for automatically regulating the displacement of the valve means to effect movement of the feeding device bythe hydraulically operated means at a flow-proportioned speed during each of the aforesaid periods.

3. In proportional feeding apparatus for feeding material in proportion to a fluid flow, in combination, a feeding device'having a reciprocable driving member* therefor, and reciprocating means for reciprocating said member to operate vsaid device. including an expansible chamber motor adapted to be supplied with, liquid under pressure for repeatedly vmoving said member in 4 one direction, said expansible chamber motor including an inlet and an outlet, a valve comprising va. valve seat surrounding the aforesaid outlet and a closure member therefor movable directly againstland away from said seat, a movable control device operated directly by and in accordance witlitheV aforesaidv uid ilow, and means controlled by said control device for intermittently operating said valve to close the same at a rate .proportioned to the aforesaid uid flow, during successive intervals, including valve-closing mittent operation.

ing material in proportion to a controlling fluid under pressure, for displacing said element in one 7.1iv OW "in combinatfm reciprocablf Operated means for urging the closure member against the seat throughout each said interval of interfeeding device, and 'reciprocating means for Voperating said device, comprising 'a displaceable driving member connected to the device, chamber means adapted to be supplied with liquid under pressure, for displacing the said member in one direction, passage means for supply and escape of liquid to and from4 said chamber means, valve means for the passage means comprising a valve part carried by the displaceable member and a cooperating valve part movable in one-di rection relative to said first valve part to cause the supplied liquid to establish pressure in the chamber means and adapted to move in the opposite direction relative to said first valve part to relieve said pressure, and lmeans for intermittently operating said valve means to effect successive strokes of the displaceable member,

peatedly moving the second-mentioned end of comprising a control element having at least one portion adapted to be moved in the aforesaid directin in which the chamber means displaces the displaceable member, said control element being adapted, at another portion thereof, for urging said second valve part in its first direction of movement, in response to movement of the firstmentioned portion in the aforesaid direction of movement of the displaceable member, and said control element and displaceable member being mounted in respect to each other for relative displacement between the member and the second-mentioned portion of the element, to relieve said second valve part, in response to movement of thedisplaceable member ahead of the rstmentioned portion of the element and in the aforesaid directionv of movement of the member, and control means operated by and in accordance with the controlling fluid now for repeatedly moving said second-mentioned portion of the control element through a predetermined path in the aforesaid direction of movement of the member and at a rate of travel proportioned to said flow, Jsaid reciprocating means including means for returning the displaceable member and the control element after each movement of the latter by the control means.

5. In proportional feeding apparatus for feeding material in proportion to. a controlling iluid flow, in combination, a reciprocably operated feeding device, and reciprocating means for opsaid control element through a predetermined path in the aforesaid direction of movement of the structure and at a rate of travel proportioned to said ow, said reciprocating means including means for returning the movable structure and control element after each movement of the latter by the control means.

6. vIn proportional feeding apparatus for feeding material in proportion to a controlling uid flow, in combination, a reciprocably operated feeding device, and reciprocating means for operating said device, comprising a chamber having an inlet for liquid and a member providing a wall of the chamber to be displaced outwardly by pressure of liquid supplied through the inlet, said member being connected to the feeding device for driving displacement of said device upon said outward displacement of the member, an outlet for the chamber extending through said member and displaced thereby, a closure for the outlet, movable toward and away from said outlet, and means for intermittently moving said eratingsaiddevice, comprising a chamber having an inlet for liquid, driving structure including a member providing a wall of the chamber to be displaced outwardly by pressure of liquid supplied through the inlet, said driving structure being connected to the feeding device for driving displacement of said device upon said outward displacement of said structure, an outlet for the chamber, a closure for the outlet, movable toward and away from said outlet, and means for intermittently moving said closure toward the outlet to effect successive strokes of the aforesaid structure, comprising a movable control element pivotally mounted to the said structure at an intermediate portion of said element, said element being adapted at one end thereof to'urge the closure toward the outlet in response to movement of the other end of the element in the direction of outward displacement of the aforesaid structure, and said control element being adapted to swing about its pivot to relieve movement of the closure toward the outlet, upon displacement of said structure ahead of the secondmentioned end of said element and in the aforesaid direction of outward displacement of the structure', and control means operated by and in accordance with the controlling fluid flow for reclosure toward the outlet to effect successive l strokes of the aforesaid member, comprising a control element having at least one portion adapted" to be moved in the direction of outward displacement of the member, said control element being adapted, at another portion thereof, for urging the closure toward the outlet in response to movement of the first-mentioned porlment, and control means operated by and in accordance with the controlling fluid flow for repeatedly moving said control element through a predetermined path in the aforesaid direction of movement of the member and at a rate of travel proportioned 'to said flow, said reciprocating means including means for returning the member and control element after each movement of the latter by the control means.

'1. In proportional feeding apparatus for feeding material in proportion to a controlling fluid flow, in combination, va reciprocably operated feeding device and a reciprocating motor for operating said device, comprising a diaphragm having an outlet therethrough and carried thereby, a chamber comprising said diaphragm and a recessed wall opening on the diaphragm and having an inlet to receive liquid for displacing the diaphragm, a connecting memberl intermediate the diaphragm and the feeding device, a closure for the outer end of the outlet, a lever'pivoted at an intermediate point thereof to said connecting member, one end of said lever being disposed and the lever maintains the closure against the outlet so that the diaphragm follows said displacement of said end of the lever, said cam being adapted to release the lever upon each arrival of 8.- In proportional feeding apparatus for feed 10. In proportional feeding lapparatus for feeding material in proportion to a controlling fluid flow, in combination, a reciprocably operated member upon said release of the lever.

ing material in proportion to a controlling fluid flow, in combination, a reciprocably operated feeding device, and reciprocating means for operating said device,` comprising a displaceable driving member connected tothe device, chamber means adapted toy be supplied with liquid under pressure for displacing the said member in one direction, passage means for supply and escape of liquid to and from said chamber means, valve means for the passagemeans comprising a valve part, a second valve part cooperating with the first valve part for flow control and movable relative to the first valve part in one direction to cause the supplied liquid to establish pressure in the chamber means and in the opposite direction to relievesaid pressure, and means for intermittentlyl operating said valve means to effect successive strokes of the displaceable member, comprising a movable control element pivotally mounted to the displaceable member at an intermediate portion of said element, said element being adapted at one end thereof to urge said second valve part in its said first direction, in response to movement of the other end of the element inl the aforesaid direction in which the chamber means displaces the displaceable member and said control element being adapted to feeding device and reciprocating means for operating said device, including an expansible chamber motor adapted to be supplied with liquid under pressure and having inlet and outlet passages for the liquid, means connecting said motor to exert a driving stroke on the feeding device in one direction upon expansion of the motor, flowregulating means associated with one of said passages for maintaining a constant flow of liquid therethrough, a valve in the other` of said pas- Asages for increasing or decreasing the fiow-of controlling fluid now, and valve-operating means controlled by said controlling device' for effecting repeatedly alternating operation of said valve alternately'to increase and decrease the flow of liquid through its passage with respect to said constant flow and at a rate of repetition proportionedlto said controlling uid flow, whereby to swing -about its pivot to relieve said second valve part upon displacement of said member ahead of the second-mentioned end of said element and in the aforesaid direction of movement oi the member, and control means operated by and in accordance with the controlling fluid flow for repeatedly moving the second-mentioned end of said control element through a. predetermined path in the aforesaid direction of movement `of the member and at a rate oi travel proportioned to said flow, said reciprocating. means including means for returning the displaceable member and the control element after each'movement of the latter by the control means.

9. In proportional feeding apparatus for feedi ing material in proportion to a controlling fluid flow, in combination, a reciprocably operated feeding device, and reciprocating means for operating said device, comprising a displaceable driving member connected to the device. chamber ber, movable valve-actuating means adapted to effect adjustment of said valve means, in accordance with the position of said valve-actuating means, and means including control means therefor operated by and in accordance with the vcontrolling fluid ow, for intermittently operating x s aid valve-actuating means to render the aforesaid ow ratio greater than unityduring successive intermittent periods and for controlling the position of said valve-actuating means to effect and maintain a predetermined proportionality between said ilow ratio and said con-` trolling uid now during each of said periods.

effect correspondingly flow-proportioned repetition of driving strokes of the motor.

11; In proportional feeding apparatus for feeding material in proportion to a controlling fluid flow, in combination, a reciprocably operated feeding device, and reciprocating means for op-l erating said device, including a displaceable drivonly sumciently to provide for displacement of the member at a rate proportioned to the controlling fluid ilow, by the liquid in the chamber means,

said reciprocating means including returning means for displacing said member in the opposite direction after each of said successive periods.

l2. In proportional feeding apparatus for feeding material in proportion to a controlling uid i ow, in combination, a reciprocably operated feeding device, and reciprocating means for operating said device, including an expansible motor chamber having an inlet and an outlet, a member moved by expansion of the chamber for correspondingly displacing the device in one direction, flow-regulating means for supplying liquid under pressure through the inlet at a constant rate, valve means in the outlet, and means including control means therefor operated by the controlling fluid ow and including a device operated under control of said control means at a flow-responsive rate of repetition, for closing the valve means intermittently at said flow-responsive rate of repetition.

GEORGE MARTIN BOOTH.

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