US2628489A

US2628489A - Hydraulic control

Info

Publication number: US2628489A
Authority: US
Inventors: Charles D Branson
Original assignee: Robertshaw Fulton Controls Co
Current assignee: Robertshaw Controls Co
Priority date: 1947-06-03
Filing date: 1947-06-03
Publication date: 1953-02-17
Anticipated expiration: 1970-02-17

Description

Feb. 17, 1953 c. D. BRANSON 2,628,489

HYDRAULIC CONTROL Filed June 5, 1947 4 Sheets-Sheet 2 awe/14M v C'lzarles D. Braason/ Feb. 17, 1953 c. D. BRANSON 2,628,489

HYDRAULIC CONTROL Filed June 5. 1947 4 Sheets-Sheet 5 Charles D. Bralzsozc.

Patented Feb. 17, 1953 HYDRAULIC CON TBOL Charles D. Branson, Knoxville, Tenn, assignor to Robertshaw-Fulton Controls Company, a corporation of Delaware Application June 3, 1947, Serial No. 752,233

30 Claims.

This invention relates to hydraulic controls, and more particularly to hydraulic devices which are adapted to control the operation of automatic washing machines, although certain of the subcombinations used in the control, while possessed of particular utility when embodied in a control for an automatic washing machine, have wider utility and are capable of use in other relationships as will be apparent to those skilled in the art.

It is an object of this invention to provide an improved control which is wholly hydraulic in its operation except that the motor employed to drive the same may be of any suitable character such as an electric motor, although a hydraulic motor could be used if preferred.

Another object of this invention is to provide an improved hydraulic control which may use any suitable source of liquid under pressure, such as water from the usual water main, for determining the beginning and the end of each of the steps constituting the automatic cycle to be effected.

Another object of this invention is to provide an improved hydraulic control for automatic washing machines whereby one or more of the steps in the automatic cycle of the machine may be readily omitted while assuring against reverse operation of the control. I

Another object of this invention is to provide an improved control wherein each of the steps of the automatic cycle of the machine is initiated and terminated by the use of a pilot valve, thereby avoiding the complexity introduced by solenoid valves and other electrical systems for effecting the control.

Another object of this invention is to provide an improved control of the type just characterized wherein the several steps of the automatic cycle are under the control of a motor-driven pilot valve which can be readily manipulated to predetermine which of the steps of the automatic cycle of the machine shall be performed.

Another object of this invention is to provide an improved mixing valve which is automatically operated at predetermined times to adjust the valve so that fluid can be delivered at a lower temperature for a predetermined period.

Another object of this invention is to provide an improved thermostatically controlled mixing valve for washing machines wherein the mixing valve, as for example during a rinsing period, can be so operated under the control of a pilot valve that colder rinse water may be delivered by the mixing valve.

Another object of this invention is to provide an improved hydraulic control which is simple and compact in construction, composed of fewer and more directly connected parts than prior comparable controls, and positive in action.

Another object of this invention is to provide an improved hydraulic control which assures that no injury will occur to the parts even though there may be wide variations in the water pressure available for operating the machine.

Another object of this invention is to provide an improved hydraulic control including an improved pilot valve which not only exactly predetermines the sequence of operations but also effects rapid transition from stage to stage so as to avoid the sluggish action incident to a gradual change in pressure.

Another object of this invention is to provide an improved timing mechanism which exactly predetermines the beginning and end of the respective steps in the automatic cycle to be effected and avoids sluggish transition from one step to another.

Another object of this invention is to provide an improved pilot valve and operating mechanism therefor for predetermining the actuation of a plurality of devices controlled by fluid pressure.

Another object of this invention is to provide an improved operating mechanism for timing the actuation of a pilot valve.

Another object of this invention is to provide an improved hydraulic control for Washing ma chines which includes means whereby an unbalanced condition in the operation of the washing machine will initiate an operation whose purpose is -to remedy the cause of such unbalance.

Another object of this invention is to provide a control as last characterized wherein therernedial operation will be repeated as long as the cause for unbalance persists.

Another object of this invention is to provide a control as last characterized wherein the remedial operation is initiated by fluid'pressure generated by the unbalanced operation of the machine.

Another object of this invention is to provide an improved control utilizing hydrostatic pressure which is composed throughout of parts that may be readily standardized, that are relatively inexpensive to manufacture, that are easy to assemble and service, and

efiicient in operation.

that are certain and Other objects will appear as the description of the invention proceeds.

The present invention in certain of its aspects is an improvement on the system disclosed and claimed in my application Serial No. 712,643, filed November 27, 1946, now Patent Number 2,607,207, issued August 1Q, '1952, for Hydraulic Controls for AutomaticWashing Machines, some portions of the system herein disclosed being the same as employed in the system disclosed in said application. Therefore, in the interest of brevity illustrated parts which are the same as fully disclosed in my aforesaid application will be summarily described herein, sufficieritly for a full understanding or" the operation of the complete system of the present invention, and cross reference is made to said earlier application for further details of construction and operation. 7 I

The present invention is capable of receiving a variety of mechanical expression only one .of which has beenillustrated on the accompanying drawings,.and it is therefore to be expressly understood thattli drawings are for purposes of illustrationonly, and are not to be construed as a definition of the limits of the invention, refer ence being had to the appended claims for that purpose. I Referring in detail to the accompanying drawings, wherein thesame reference characters are used to designate corresponding parts in the sev er'a'l figures, i

Fig. l is a diagrammatic view to illustrate the compohentparts of an hydraulic control embodying the present invention laid out Without regard to the spatial relationships of the functioning elements actually existing ma washing machine embodying the present invention; 7

, Fig. 2 is an axial sectionthrough a preferred form of automatic mixing valve; ,7 l

Fig. 3 is an axial section through a preferred formof pilot valve and its motor-driven timing mechanism;

Fig. 4 is a plan view of the automatic switch controlled by said timing mechanism; v

Fig. 5 is a. cross section on line 5-5 oi F'ig. '3;

is an elevation of a preferred form of pilot valve; I a V Fig. '7 is an end view of the valve of Fig. 6; n

Figs. 8, 9, and 11 are cross sections of the pilot valve of Fig. 6 taken on the lines 8=8, 9-9, 10 and H-H of Fig. 12; and

, Fig. 12 is an axialsectio'n of said pilot valve taken onthe line I2---IZ of Fig. '7.

Referringfirst ,to the diagram of Fig. 1, i0 designates the driving shaft of 'a washing machine of any suitable character and construction whichfmaybe driven in any suitable way to impart any appropriate motion or motions to the movable elements within the tub or casing of the machine to effect the operations embraced within the cycle of the machine. While any suitable motor, as for example an hydraulic motor, may be used, it will be assumed for purposes-of exemplification of the present invention thatan. electric motor is employed. As this motor and the elements driven therebyconstitute no part of the present invention, they have not been illustrated in h in e f sim lic t .The tub of the; washing machine is supplied with water through a suitableconduit or passage, fragment of which is illustrated at H, after passing through a howcontrol valve generally indicated at I2. Valve I2; is operated fiuidpressure, partly under the control of a float valve in or associated with the tub and generally indicated 4 at IS. The water passing through the flow control valve first passes through a mixing valve generally indicated at M which is supplied with hot and cold water from any suitable sources through conduits or passages connected to the nipples I5 and I6, respectively. The admission of water to the tub, as well as the performance of other steps in the automatic cycle or the machine,

is under the control of a pilot valve generally indicated at H, operated by a timing mechanism shown more particularly in Fig. 3. The timing mechanism also operates the mechanism, here assumed to be a switch and shown more particularly in Figs aand 4, for starting and stopping the motor which drives the mechanism associated with the tub and also the motor which drives the timing mechanism and therefore the pilot valve, but while said timing mechanism and pilot valve are shown as driven by an electric motor they may be driven by. any other suitable motor, such as a hydraulic motor. e v

Associated with the shaft as is a Hem eter valve of any suitable constructigiin, generally indi cated at 13-, and operatively associated therewith is a brake operator, generally indicated at I Q, for operating any suitable brake mechanism associated with the mechanism which determines when spinning of the clothes shall be initiated toefie'ct the drying operation. Valve l8 and 'operatcr' it are under the control of a flow contrl valve genera'lly indicated at 2B, and said last named valve is in turn controlled bya pressure operated valve generally indicated at 2! in the line co'n'ii the alve 20 with the pilot valve I'T, pressure operated valve 2 l in turn being under the cont "1 of fluid pressure devices, one of which is;- g ally indicated at 22, associated with the legsof the washing machine so as to develop apr'ess'ure for operation of the valve 2l in the event era pre determined condition of unbal rice in the operation of the machine. The main and valve oper ator is generally indicated at23 and is also-con trolled by the pilot alve ll.

Referring now to Fig. vh tails of the mixing valve id in 1, a casing: 250: any suitable construction, form and matei i "roviued withthe aforesaid inlet nipples 5 F6 for the hot and cold water, respectively. Each of these inlet nipples is preferably provided with a filter .25 to prevent scale or other ioreign matter from entering the hydraulic system hereinafter de;-= scribed. Any suitable sources of hot and cold water may be connected Wi th'said nipples I51 and I6, respectively, as the buildings system for 'sup plying hot water to various outlets, as'conven tionally provided, and the'cold water mainof the building. The passages through the nipples, t5 and l8 communicate with hot and cold water chambers. 27 and 28, respectively, and said chambers in turn communicate with angintermediate mixing chamber 29 through ports seand tirespectively, provided in any suitable way but h ere shown as merely apertures in the walls dividing the chambers 27 and '28 from the chamber 29, although suitable members providing ported'valve seats may be used in said-'apertures-it pref-erred. Tofacilitate manufacture, the portion of the casing including the chamber'i l they be made separate from the portion containing thscham'- bers 28 and 29, and the two portions may be connected in any suitable way, with or Without interposed packing as shown at 3'2. D spc 'ed' in the chamber 29 Ior'coo'per'ati'on Withfthe at ports 39 and 3! is a balanced valve '33 of suitable co'ristruction, here shown as a single member provided at its opposite extremities with beveled seating surfaces 34 and 35, respectively, for cooperation with the ports 39 and 3! and thereby proportioning the flow of hot and cold water into the mixing chamber 29. Mixing chamber 29 communicates through any suitable passage or passages in housing 25 (not shown) with a thermostat chamber 36 separated from the cold water chamber 28 by a partition 31 in which is an aperture 38.

Disposed in chamber 36 is a thermostat of any suitable construction here shown as having an external cup-shaped Wall 39 provided with a flanged open end 46 and a portion of reduced diameter 41 at its opposite end. End wall 42 of said cup-shaped wall 39 is provided with an aperture 43, and hermetically sealed to said end wall at said aperture is an expansible and collapsible corrugated tubular wall or bellows 44. The movable end wall 45 of said bellows 44 has attached thereto in any suitable way a valve stem 46, here shown as a hollow stem 46 which passes through the apertures 43 and 33 and is attached to the valve member 33 in any suitable way. The passage 41 through said stem opens at one end into the chamber 21, but its opposite end is closed by the movable end wall 45. Where stem 46 extends through the aperture 38 in the partition 31 a flexible wall, shown as an expansible and collapsible corrugated tubular wall or bellows 48, has one end secured in any suitable way to the valve stem 46 at 49 while its opposite end is secured in any suitable way to an annular plate 59 mounted on the partition 31 around the aperture 38 with interposed packing if desired. As shown, said plate 56 is shaped to provide a seat 51 in which a yieldable annular pad 52 disposed and against which the end wall 42 of the thermostat is seated when the flange 49 of the thermostat is mounted on the flange 53 of the casing 25, flange 49 being secured in position in any suitable way as by an annular plate 54 that in turn is held in position by the flange 55 of a bonnet member 56 hereinafter described, with packing 5'! interposed between said

members

53, 54 and 55 if preferred. Said

members

53, 54 and 55 may be connected together in any suitable Way as by bolts and nuts, screws, etc., which have been omitted from the drawings in the interest of simplicity.

With the parts assembled as shown, end wall 42 of the thermostat presses pad 52 onto its seat 5| and thereby presses plate 50 against the partition 3'! so that leakage of water between chambers 29 and 36 is prevented. Bellows 48 has the same effective area as valve port 3| so that variations in the cold water pressure are balanced out. On the other hand, the chamber inside of the communicating bellows 44 and 48 is in communication with the passage 41, as through one or more apertures 41', and as passage 41 communicates with the hot water chamber 21, bellows 48 is subjected on its opposite sides to the pressures of the hot and the cold water. Thereby valve 33 is balanced against pressure variations in and pressure differences between the hot and cold water.

Spaced inwardly from the flange 4B of the cupshaped wall 39 is an interior flanged member 55 secured to the wall 39 in any suitable way, and attached to the inner periphery of said flanged member 58 is an expansible and collapsible corrugated tubular wall or bellows 59 which extends into the chamber 60 constituting the expansible flanged extremity of said cup-shaped member 62,

and normally holds the cup-shaped member 62 in engagement with the head 65 or the movable end wall 6| of bellows 59, but if the pressure in the chamber 66 continues to increase after valve member 33 has engaged its seat at port 3|, the bellows 59 may be contracted by the increasing pressure, lifting member 62 against the tension of spring 61, member 62 sliding on post 64. The depth of the depression in the cup-shaped member 62 is such that the head 65 will not be engaged by the end wall 61 under the maximum' displacement contemplated.

Attached to the annular plate 54 in any suitable way is one end of an expansible and collapsible corrugated tubular wall or bellows 68 whose opposit end is formed as or attached in any suitable way to a reentrant cup-shaped movable wall 69 having therein a bleed opening 16 leading to the expansible and collapsible chamber between bellows 68 and wall 69. The end wall ll of cup-shaped wall 69 engages the flange member 66 heretofore referred to, and a coil spring I2 reacts between said bottom wall H and a stationary member 13 formed by or carried on the end wall 14 of the bonnet member 56 heretofore referred to. Member 13 as shown has an inwardly extending tubular portion 15 internally splined for cooperating with a similarly splined enlargement I! mounted on or formed integrally with a stem 18 which at its inner end 19 extends into contact with the end wall II of the cupshaped member 69. Stem 18 is here shown as provided with a packing gland 19a which may be of any suitable construction, or if preferred a packless construction may be employed instead. Stem 78 extends outwardly to anysuitable distance where it is provided with any suitable manually operable means for moving'the stem in the direction of its axis, or the stem 18 could be made rotatable and the elements 15, T! be provided with cooperating threads to provide the axial movement of the inner end of the stem 18. In the case of a washing machine the mechanism for effecting movement of the stem 18 manually in the direction of its axis would be located where it would be easy of access and preferably would have associated therewith any suitable indicating means calibrated in temperature so that by reference thereto the operator will be able to set the position of the stem 18 and therefore predetermine the temperature of the wash Water to that which is suitable for the goods being washed. The chamber 19"within the bonnet member. 56 is in communication with a conduit or passage 86 leading to the pilot valve generally indicated at H in Fig. 1 for a purpose to be explained.

The cup-shaped wall 39 is also provided with one or more apertures 8| in the area between the flanged member 58 and the flange 49 so as to provide a means of communication between the chambers 82 and 83 interiorly of the

bellows

59 and 68, resp ectively, and the chamber 36, so that the pressure of the water in the chamber 36 is transmitted to the chambers 82 and '83. In

chamber 8-3 said pressure acts on the end wall of the cup-shaped member 59 attached to the movable end of bellows 68 so that normally said end wall is held in contact with the end '19 of the stem 'iS. When, however, by reason of the operation of the bleed opening '79 the pressure is equalized on opposite sides of the end wall '69, spring 12 may contract the bellows 68 for a purpose to be explained.

The valve member 33 is preferably urged toward its seat at port 3| by a suitable spring 818, here shown as a coil spring reacting between the member 33 and a suitable spring seat formedin the wall of the hot water chamber 21. The chamber 69 within the thermostat is charged with any suitable 'thermosensitive fluid, preferably filled with a suitable thermosensitive liquid, so that under the influence of the temperature in the-chamber 35 it will expand on contract, contracting or expanding the bellows 44, to move the valve member -33 toward one or the other of its seats at the ports 38 and '3l, to the end-that the temperature of the mixture within the hamber 36 may, under normal thermostatic control, be kept "at approximately the desired temperature. Chamber '35 has a suitable outlet'nipple 85 leading therefrom and through which the-mixture of hot and cold water'flows 'from the chamber '36.

Explaining the operation of the mixing valve as so far described, Iho't-and cold waterilow respectively into the chambers 27 and '28, and asumingthat the 'valve "member 33 is in an inter mediate "position, the hot and cold waterfiow through the ports '39 and 31, respectively, to the mixing chamber 29. hot and cold water 'flows into the chamber 36 where it is in intimate heat interchanging relationship with "the exterior wall 39, "4,! ;of the thermostat chamber 69. If desired, any suitable bafiiing means'may be provided :in chamber '36 to assure flow of 'themixture intointimate contact with the thermostat. From the chamber 36 the mixture-fiows-throughthe outlet 65.

Assuming 'a predetermined setting --for the thermostat, if the -temperature 'of :the mixture rises above the "predetermined temperature "the thermosensitive fluid. in chamber 611 expands to contract bellows 44, bellows '59 with-its springffi'l being so constructed as to afford ,greater opposition *to movement under-the pressure "in the chamber 6 ii thanbellows 3 4 and spring 56,4. 1;Contractionof the bellows 44 causes the-valvestem 46 to move downwardly -as-v'iewed ,in Fig. :2, decreasing the flowthrough port 30 "butincreasing the how through port 3| so ,as to restore the temperature of the'mixture-to its predetermined degree. "Conversely, if the temperature of the mixture dropsbelow thepredetermined-temperature the'thermosensitive fluid in'chamberfifl contracts; andspring 8 4 acts through-thevalve member 33 and stem 46 to expand the bellows 1M, moving the .valve member 3'3';to 'decrease' the'fiow of tcold water; through the port ;';3 l "and 'increase the flow "of hot water through the portill.

'If-thetemperature of the mixture causes ;;the thermostat'ito engage valve 33-with its seat at port 30,"further-expansionofthe chamber 69 by compression "of the bellows M-is prevented, and ifforany'reason the temperature of the mixture thereafter rises to increase the pressure in" the chambertil, this pressure-acting-on the movable endwall 61 of bellows -59 contracts-bellows59, lifting the cup-shaped member 62 on of the-head 65, against the tensionofthe spring 61, mntil :such :time'ias the temperature decreases sufii- From chamber 29 themi-Xed ciently to permit the spring 5'] to restore engage? ment between the cup-shaped member 62 and the head 65 or end wall 6|. The apertures 8| permit free circulation of the liquid between the chamber 3e and the chambers 82 and 83, so that the latter are full of liquid at the same pressure as in the chamber 36. If such water as leaks through the bleed hole 7.0 may flow freely out of the chamber 19 through passage 80, the movable end wall H of the cup-shaped wall 59 will be held by the water pressure against the end 19 of the stem 18. However, if water cannot flow freely away through passage '80, pressure will accumulate in the chamber 19' until the pressures at the opposite sides of movable end wall I I are equalized, whereupon spring 72 will move end wall 1| downwardly away from the end :19 of stem 18, and this movement will be transmitted through the flange '66 and spring 81 to the end wallfil of bellows 59, thereby tend..- ing to contract the chamber 6!). With the chamher 859 filled with a thermosensitive liquid, this pressure will be transmitted to bellows 44, contracting the latter and moving the valve stem ie so as to advance valve member 33 toward its seat at port 313, nearly if not completely closing the latter, whereby predominately cold water is now admitted from chamber '28 through port 31 to chambers 29 and 3t and thence flows through the outlet 35 to cfiect the rinsing operation.

To adjust the temperatureof the-mixture flowing out of chamber 36 through outlet 85, stem 13 is moved upwardly or downwardly in the direction of its length by any suitable manually adjustable device as heretofore referred to. If stem 13 is moved downwardly as viewed in Fig. 2, the end wall H of cup-shaped member 69 is moved down- Warclly, moving flange member 56 therewith and, through spring iii, expanding bellows 59 by the pressure applied to its movable end wall 6! by the cup-shaped member 62. This tends to contract the chamber 60, but as the chamber 69 is full of thermosensitive liquid this pressure is transmitted to the movable end wall 45 of bellows '44, causing the valve member 33-to=move downwardly so as to decrease the-flow of hot water through port 36 and increase the flow of cold water through port 3!, thereby maintaining a lower temperature of the mixture in chambers 29 and 36. Conversely, movement of the stem 18 upwardly as viewed in Fig. 2 will cause valve member 33 to approach its port 3! so that a higher temperature will be maintained in'chambers Hand 36 Thereby, by adjustment of the stem 13 in the direction of its length, in one direction or the other, the-temperature to be maintained in chamber 35 may be closely-predetermined.

The water flowing through the outlet 35 of the mixing valve, whether wash water orrinse water, first flows through any suitable'passage -or-conduit86 (Fig. 1) to theinletnipple -81 of aflow control'valve generally indicated at-l2 in Fig.1. Asdisclosedmore particularly in my aforesaid application, such a flow control valve includes a casing 88 from which extends the outlet H heretofore referred to. :Associated with said outlet H is a valve port 89 with which cooperates a valve member '99 of any suitable construction. Valve member 99 is carried by the movable end wall 91 of .an expansible and collapsible chamber 92 whose peripheral wall is here shown as composed of an expansible and collapsible corrugated tubular wall or bellows 93 having one end formedas orattajched inany suitableway toethe movable and wall 9| and its opposite end attached in any suitable way to a stationary end wall 90, here shown as constituting the end wall of the casing 99. Movable end wall 9i is provided with a suitable bleed opening 95 for a purpose to be explained, so that the bellows chamber 92 is in communication through said bleed opening with the chamber 90 in casing 08 that is exterior of the bellows 93. Casing 80 is constructed in any suitable way to provide for the com-munic-ation of chamber 92 with a conduit or passage 9'! leading tothe pilot valve generally indicated at H.

As also shown in Fig. l, a float controlled valve generally indicated at I3 is mounted in or associated with the interior of the tub so as to respond to the level of the wa ter therein. Any suitable fioat controlled valve may be used. As shown, a float I of any suitable construction is connected through a pivoted lever IOI to a valve member I98 here shown as carried by the movable end wall I02 of an expansible and collapsible corrugated tubular wall or bellows I03 whose opposite end is suitably secured to a fixed block I00 having passages 05 and I055 leading from the chamber I 07 in the interior of said bellows. Valve member I00 cooperates with a valve seat at the end of the passage I05. Passage I is connected by any suitable conduit or passage I00 with the pilot valve generally indicated at ll, while passage I09 is connected to any suitable low pressure or exhaust conduit or passage IIO such as a passage leading to the drain connections.

To explain the operation of the flow control valve I2 and float controlled valve I3, when the pilot valve I7 is so positioned that passages 9'! and I09 are in open communication with the drain passage H0, with float I00 holding valve member I08 away from its seat at the end of passage I05, water may flow freely from the mixing valve I4 through conduit 96 to chamber 99 in the flow control valve and thence through outlet II, because the pressure of the water in chamber 96- acting on the end wall 9| of bellows 93 holds the valve member 90 away from its seat at port 89 inasmuch as any water entering the chamber 92 through bleed hole 95 is exhausted to the drain I I0. When, however, the level of the water in the tub raises float I00 so as to depress valve member I98 into engagement with its seat at the end of passage I05 water accumulating in the chamber 92 can no longer escape to the drain I I0. Thereupon the pressure builds up in chamber 92 until the pressure'is equalized on the opposite sides of movable end wall 9I, whereupon the bellows 93, by reason of its inherent resiliency or a spring could be used therewith'if desired, will move valve member 99 into engagement with its seat at port 88, terminating the flow of water through the mixing valve I4 to the tub. As long as the level of the water in the tub holds the float I00 so that valve member I08 closes passage I05, valve member 90 will be held against its seat 89 by the equalized pressures in the chambers 92 and 96, preventing flow of water through the mixing valve I4. Similarly, if the pilot valve I I is moved so as to interrupt the communication between passages 97 and I09, aspwhen it comes time to empty the tub, the pressure is still retained in chamber 92 so as to hold valve member 90 against its seat at port 99 notwithstanding that the lowering of the water in the tub causes float I00 to withdraw valve member I08 from its seat at the end of passage I05. Therefore, admission of water to the tub is possible only when pilot valve 10 I1 places passages 91 and I09 in communication and the float I00 is also holding the valve member I08 away from its seat at the end of passage I05.

The hydraulic control of the present invention is adaptable to a washing machine of the type wherein the shaft I0 is suitably driven so as to produce a wobbling or other suitable non-centric motion during the washing period, following which, during the drying period, the clothes are spun at an increased speed of revolution. In Washing machines of this character, which are now known to the art, if the clothes in the tub at the end of the washing period are not distributed around the axis of spin with fair uniformity, the unbalanced load is productive of vibration, and in machines of this character it is known to provide the driving shaft with what is known as a Hemmeter valve for the purpose of permitting water to flow therepast into suitable cavities, chambers, or the like, at such locations as tend to establish a proper balance, a deflection oi the shaft in one direction, for example, being effective to pass water into a diametrically opposite chamber as a balancing weight. Hemmeter valves of this character are known to the art and the details thereof constitute no part of the present invention.

Such a Hemmeter valve is generally indicated at I8 in Fig. 1 and includes a ring II2 of suitable elastic or resilient material which surrounds the shaft I9 with a nearly fluid-tight contact the're with, said ring being compressible under eccentric motion of the shaft to permit flow of water therepast at 180 from the point of compression, said ring being retained in cooperative relationship with the shaft I0 by a surrounding container I I3 attached to or formed as a part of a casing HA. In conformity with the present invention casing H4 is in communication through any suitable conduit or passage II5 with the housing II 6 of a brake operator generally indicated at I9, and which may be and preferably is of the construction disclosed in my aforesaid application. As indicated diagrammatically in Fig. 1, casing II6 has interiorly thereof an expansible and collapsible corrugated tubular wall or bellows I I I which has a fluid-tight connection with the casing H8 at its stationary end, while its movable end I I8 is connected in any suitable way to a stem I I9 that in turn is connected with any suitable brake which controls the initiation of the spinnin of the clothes. When the chamber I within said casing H6 is pressurized stem I I9 is moved to the right as viewed in Fig. 1 for releasing the brake and initiating the spinning of the clothes, whereas when pressure is released from said chamber I20, stem H9 is moved to the left as viewed in Fig. 1, due to the inherent resilience of the bellows I I8 or a spring may be used if desired, so as to apply said brake and prevent spinning. I

To determine when the chamber I2I in casing H0 and the chamber I20 in casing II6 shall be pressurized to release the brake and condition the Hemmeter valve for'operation, or apply the brake and release the pressure in the Hemmeter valve casing, a flow control valve generally indicated at 20 is associated with said casings H4 and IIB. As shown in Fig. 1, a casing I22 is suitably .constructed was to provide a valve portI 23 in communication with chamber I2I. Mounted the chamber I24 of said casing is an expansible and collapsible corrugated tubular wall or bellows I25 which at its stationary end is suitably secured to the end wall I26 of said casing, while its opposite and movable end wall I2! is provided with any suitable valve member I28 for cooperation with said port I23. Chamber i2 i is in communication through any suitable inlet I23 with a source of water, which may be the cold water line leading to nipple I2. The chamber I32 interiorly of the bellows I25 is in communication with chamber- I22 through a bleed opening IBI, and said chamber I33 has an outlet I32 formed on or attached to the end wall I253. The passage in outlet I22 at its opposite end is in communication with a valve casing I33 with which communicates any suitable conduit or passage I32 leading to the pilot valve.

Disposed interiorly of casing I33 is any suitable valve member I35 mounted for movement so that it may open and close the inlet I36 to said passage I34. As here shown, said valve member I35 is mounted on a stem I31 that is secured in any suitable way to the movable end wall I38 of an expansible and collapsible corrugated tubular wall or bellows I39 the opposite end of which is secured in any suitable way to a casing Hi2 surrounding said bellows and here shown as constituting an extension of the casing I33. Movable end wall I38 as shown is provided with an external flange Id! slidably mounted in the interior of the casing I39, and a coil spring I42 extends between said flange and the end of the casing I46 so as normally to urge the valve member I35 into a position wherein the inlet I35 to passage I34 is open.

Casing I48 has suitably secured thereto an end wall I43 in which is a valve port I4 4, here shown as formed by providing an aperture in said end wall I43 with an interiorly projecting flange. Suitably mounted interiorly of the casing I46 is a flap valve I45 of any suitable form and construc tion. As here shown, a ring I25, which may be secured to the wall of the casing I43 in any suitable way, is provided with a radially extending resilient or elastic arm I4? carrying said flap valve I45. Valve I45, for a purpose to be explained, is intended to have a predetermined leakage, and to this end it may be provided with a bleed opening or its engagement with the flange surrounding the valve port I34 may be such as to secure the desired leakage. Communicating with said port I44 is a conduit or passage I49 leading to interconnected pressure devices, one of which is generally indicated at 22, that are associated with the legs of the washing machine. As diagrammatically illustrated in Fig. 1., each pressure device includes a foot I50 adapted to rest 6 on the floor, and extending upwardly therefrom is a post I] terminating in a plunger 152. Mounted on said plunger I52 in surrounding relationship therewith is a cylinder or casing I53 having suitable provisions as nuts I54 for attaching the same to a leg of the washing machine. The chambers I55 in the cylinders I53 above the plungers I52 associated with the several legs are in open communication with each other through suitable cross connections I56 and also in communication with the passage I49.

During the washing cycle pilot valve I'I closes the outlet of passage I33 whereby water entering the chamber I24 flows through bleed opening E3? to chamber I30, thereby equalizing the pressure on the opposite sides of the movable end wall I23, whereby bellows I25, either because of its inherent resiliency or a spring could be used if desired, moves valve member I28 to close the port I23. As there is always a small amount of leakiii) age between the shaft I0 and the Hemmeter valve member II2, chambers I and. I2I are not under pressure, and therefore bellows III, either by its own resiliency or a spring could be used if desired, holds stem III at its leftward position as viewed in Fig. 1, applying the brake which prevents operation of the means for initiating spinning. At the close of the washing cycle pilot valve I'I opens the outlet of passage I34 so that the pressure in chamber I is released. Thereby the pressure in chamber I24 compresses bellows I25, withdrawing valve member I28 from port I23, whereby the pressure of the liquid in chamber I24 is introduced into chambers I23 and I2 I, releasing the brake to initiate the spinning operation and also conditioning the Hemmeter valve.

If now by reason of improper distribution of the clothes in the tub vibration is set up in the machine, movement of the cylinders I 53 with respect to their plungers I52 produces a pumping action, downward movement of each cylinder with respect to its plunger developing a pressure in the chamber I55 which is communicated through the passage I49 to the chamber I51 within casing I40. The flap valve I45 functions as a check valve to largely retain the pressure so de veloped in chamber I 5?, and the pressure developed in chamber I51, when of sufficient magnitude, acts on the movable end wall I38, con tracting the bellows I39 and moving valve mem her I upwardly as viewed in Fig. 1 until the inlet I36 of passage I34 is closed. lhis permits pressure to develop in chamber I30 whereupon, when the pressure is equalized on the opposite sides of the movable end wall I21, valve member I28 is moved to close the port I23. This results in a release of the pressure in chambers I29 and I2I by reason of leakage past the Hemmeter valve, whereby the brake operator III) is again moved to the left as viewed in this figure to apply the brake and discontinue the spinning operation. This causes the mechanism to resume its washing movement so that a redistribution of the clothes will be effected by the wobbling other suitable movement of such mechanism, After a lapse of a predetermined period or" time determined by the leakage or bleeding at the valve I the pressure in chamber I51 decreases sumciently to permit spring I42 to expand bellows I39, moving valve member I35 downwardly so as to reopen the inlet to the passage I 34. As the pilot valve at this stage of the cycle is retaining the outlet of passage I34 open, pressure is released promptly from chamber I30, the pressure in chamber I24 contracts the bellows 525 and opens valve member I28, and liquid under pres.- sure is admitted to the chambers I 2i and I22 to condition the Hemmeter valve and release the brake for resumption of the spinning operation.

Therefore, the valve generally indicated at 2i operates as a time delay valve'for predetermining the period of time during which spinning will be interrupted for redistribution of the clothes in the tub, the fluid pressure devices 22 acting to apply pressure quickly to chamber I5! to effect the closure of the inlet to passage I3 and there after, because of the leakage provision, slowly releasing the pressure over a predetermine: period of time. If preferred, however, the pressure may be developed slowly and released with the desired rapidity by appropriate construction of the valve mechanism and associated pressure devices generally indicated at 2| and 22.

To control the main drain valve, a second pressure operated. device, generally indicated at 23 in Fig. 1, may be of the same construction as disclosed in my aforesaid application or as generally indicated at I9 in Fig. 1 hereof. As shown, the valve operator includes a casing I66 in which is an expansible and collapsible chamber from the movable wall of which extends a suitable stem I6I for connection to and operation of a drain valve of any suitable construction. The chamber in casing I66 is in communication with a conduit or passage I62 which leads to the passage I34 heretofore referred to, because during the washing cycle pressure should be maintained at operator I66 to keep the drain valve closed, but at the end of the washing cycle when spinning is to be initiated the pressure should be released at the operator 23 to open the drain valve at the same time that pressure is released from chamber I36 so as to effect opening of the valve I28 and application of pressure to chambers I29 and I2I in order to release the brake that initiates spinning and simultaneously condition the Hemmeter valve. It will be observed that if the valve mechanism generally indicated at 2I is actuated because of an improper distribution of clothes so as to result in a resumption of the washing movement as heretofore explained, operator 23 is not actuated to close the drain valve because casing I 66 is still in communication through passage I62 with passage I34 whose outlet end is open because the pilot valve is now at the spinning stage of the cycle. When the pilot valve is closed, however, the pressure in passage I34 is communicated through passage I62 to the casing I66 and thereby the drain valve is maintained closed.

As is apparent from the description so far given, the automatic cycle of operation referred to contemplates a plurality of steps or stages carried out in sequence. The number and character of steps in such a cycle may be varied, as will be apparent to those skilled in the art. It is desirable, on the other hand, that some one or more of the stages in the sequence be capable of omission if desired, but the sequence must never be capable of reversal. To this end the hydraulic control of the present invention is subject to a manual setting which may skip one or more of the steps in the cycle but the manual control for this purpose is so constructed that the sequence in steps can never be reversed. To move the pilot valve generally indicated at I1 through the sequence of steps or stages constituting the program of the machine, said pilot valve is automatically driven by a timing mechanism associated with said pilotvalve, with provision for manually setting the pilot valve, as shown in Figs. 3, 4 and 5. While the timing mechanism and pilot valve now to be described are of particular utility as applied to an automatic washing machine, it is apparent that this mechanism has utility in other relations, and therefore it is to be expressly understood that it the intention to protect the same as applied to other uses as well as a subcombination of the hydraulic control here disclosed.

'teferring now to Figs. 3, 4 and 5, an electric motor 965 of any suitable size and construction has an appropriate casing I66. Armature I61 of said motor is mounted in any suitable way to rotate upon a shaft I68 which extends above the casing I66, as shown at Itt, where it may be provided with any suitable knob or other manually operable device for rotating the shaft by hand when one or more of the stages is to be skipped. The armature I61 of said motor is provided in any suitable way with a hub I69 formed as or on which is secured a pinion I16. Meshing with said pinion I16 is a planetary gear I1I which also meshes with a stationary ring gear I12 secured to the casing I66 in any suitable way, as by screws I13. The stub shaft I14 of gear I1I is carried by a disk I15 which'is rotatably mounted on the shaft I68 and provided with a hub carrying or formed as a pinion I16. Pinion I16 in turn is in mesh with a planetary gear I11 which also meshes with said ring gear I12. The stub shaft I18 of gear I11 is carried by a disk I19 also rotatably mounted on the shaft I68, and its hub carries or is formed as a pinion I86. Pinion I86 is in mesh with a planetary gear I8I which also is in mesh with said ring gear I12, and its stub shaft I82is carried by a disk I83 also rotatably mounted on the shaft I63. The hub of disk I83 carries or is formed as a pinion I84 which is in mesh-with a pair of diametrically disposed planetary gears I85 that also are in mesh with said ring gear I12. The stub shafts I66 of said gears I35 are carried by a disk I61 also rotatably mounted on said shaft I68.

Suitably formed on or secured to the hub I86 of disk I81 is a cam member I89 (see Fig. 5) having a nose I93 which cooperates with the cam face I96 of an opening in a lever I64 pivoted at I9I on a stationary part of the apparatus, here shown as the end of the ring gear I12. Opening I96 is provided with two steps I62 and said lever is urged by any suitable spring so as to hold the cam surface of said opening in cooperative relations'hip with said cam member I89. Thereby at each revolution of the cam member I69 lever I94 is oscillated twice about its pivot IQI. At its end opposite said pivot lever I 94 carries a pawl I95 pivoted thereon at I96 and urged by a spring toward the periphery of a ratchet wheel I61. Therefore at each rotation of the cam member I89 lever I94 is actuated once to advance the ratchet wheel I91 the distance of one tooth. By providing the periphery of said ratchet wheel I61 with a suitable number of teeth the desired number of steps required to move the ratchet wheel through one complete revolution may be predetermined, and by suitably selecting the gear ratios of the gear train I16 to I61 the lapse of time required for one complete revolution of the ratchet wheel I61 may likewise be exactly predetermined.

Ratchet wheel I61 is secured in any suitable way, as by a threaded connection at I68, to the end of the shaft I68 so that shaft I68 is driven by said ratchet wheel while said ratchet wheel may be manually rotated by shaft I68 independently of said gear train, but only in the direction in which said ratchet wheel is moved by the pawl I95 during the motor driven operation of said ratchet wheel. Any suitable manually operable knob or other device may be secured or operatively connected to the end I64 of the shaft I 68 and with said device may be associated any suitable indicating means for designating the several stages in the operation of the machine. V

Shaft I68 is also shown as provided with means for actuating the .means which control the operation at both the motor I 65 which drives the timing mechanism and also the main motor which drives the washing machine proper, the means here illustrated (see Figs. 3 and 4) being of the same general type as that illustrated and I described in detail in my aforesaid application.

As shown. the exteriorly projecting portion of the shaft 168 provided with a cam 230 secured to the shaft 168 in any suitable way, as by a set screw .201. Cam 20.0 is circular for the greater part of its circumference but rises to a high point followed by a step at 202. Mounted on any suitable .support, here shown as a block 203 carried by the end wall of casing 162, is a frame 204 which carries three

spring contact elements

205, 256 and 201, respectively carrying

contacts

208, 2119 and 210. Contact element 2135 is in the circuit leading to the main motor of the washing machine, contact element 206 is in the circuit of the timing motor 165., and contact element 201 is common to both of said circuits.

When the machine stops, the contact elements 2.25 and 206 are on the high point 222 of the cam but contact element 201 has dropped down the step, whereby the circuits of both motors are opened. When shaft 158 is rotated manually to the station designated Start cam 220 is rotated in the direction of the arrow 211 .in Fig. 4 to the position where the contact element 208 also drops down the step 2132, bringing the contact 209 into engagement with contact 2111 and thereby closing the circuit through the timing motor 165. The timing motor drives the shaft 168 through the gear train and ratchet mechanism, and at a predetermined time the cam 2110 causes the contact element 255 to drop down the step 2132, bringing its contact 208 into engagement with contact 299 so as to complete the circuit through the main motor of the washing machine. Motor 165 drives the ratchet 191 through the reduction gearing heretofore described to advance said ratchet one step at a time through one complete revolution of said ratchet. At the end of said revolution contact element 221 drops down the step 292, separating its contact 211) from contacts 2119 and 208 and thereby interrupting the circuits of both motors. At any stage in the operation of the mechanism shaft 158 may be advanced manually in the same direction in which the ratchet is driven by the motor driven reduction gear train, but not in the opposite direction, so as to omit any desired stage or stages in the cycle or program of the machine.

Coming now to the pilot valve generally indicated at 11 in Fig. 1, and shown in detail in Figs. 3 and 6 to 12 inclusive, said pilot valve is shown as including a casing 213 associated with the casing 166 for the timing mechanism in any suitable way, said casing 2.13 having an opening 214 at its end adjacent to the casing 166, While its opposite end is shown as closed by a closure plate 215 secured to the casing 213 in any suitable way as by screws ,2 it. Closure plate 215 as shown is provided with a nipple 211 having .a passage 213 leading from the chamber 219 interiorly of said casing 213, said nipple 211 being adapted to be connected to any suitable low pressure or exhaust conduit or passage such as a passage leading to the drain connections.

Rotatably mounted interiorly of said casing 213 is the cylindrical body 2211 of the pilot valve, said body being operatively connected to the ratchet wheel 191 in any suitable way so as to be driven therefrom. As shown, the ratchet wheel has a hub 221 rotatably received in the opening 214 in the pilot valve casing, and itis operatively connected to the end of the pilot valve body 220 in any suitable way, as by a pair of pins 222 received in apertures in said hub and body. Bo y 220 is shown as provided with an axially extending bore 223 for a portion of its length, said bore acting as a passage for the escape of liquid as hereinafter explained, and in order to hold the body 220 in driving relationship with the hub 221 a coil spring 224 is disposed in said bore and reacts between the body 220 and the cover plate 215. Casing 213 has a suitable number of ports 225 leading therethrough, and associated with each of these ports is a nipple 226a for connection with the conduits or

passages

80, 91, 109 and 134 shown in Fig. 1, only two of such nipples being illustrated in Fig. 3..

Referring now to Figs. 6 to 12, inclusive, the body 220 of said pilot valve member is provided with any suitable number of circumferentially extending passage systems, each including one or more grooves of suitable length and location for the program to be carried out, for registry with the corresponding ports 225 at suitable times during the rotation of said body 2211. Figs. 6 to 12 illustrate four circumferential passage systems respectively designated 226, 221, 228 and 229. As shown in cross section in Fig. 8, passage system 226 is composed of three

grooves

230, 231 and 232.

Grooves

230 and 231 extend to the end of the body member a shown in the end view, Fig. 7, while groove 232 has an axially extending cross groove 233 in communication therewith and also extending to the end of the body member. Thereby all of the grooves in system 226 may drain into the chamber 219 at the end of the body member. Passage system 221, as shown in cross section in Fig. 9, is composed of a single groove 234 with which communicates a passage 235 leading into the bore 223. Passage system 228, as shown in cross section in Fig. 10, is formed as a single groove 23% of 360 extent. Passage system 229, as shown in cross section in Fig. 11, is composed of three grooves 231, 238 and 239 each of which communicates with the groove 236 by

cross grooves

240, 241 and 242, respectively.

Passage 13d terminates at the pilot valve in a port 225 in circumferential alignment with the passage system 229. When any of the

grooves

230, 231 and 232 are aligned with the port 225 of passage 13s the liquid in said passage may drain into the chamber 219 and thence through the passage 21% to the drain, when pressure is to be released in said passage 23%, but when the solid portions of the pilot valve body 228 between said grooves are opposed to the port 225 in communication with passage 134, pressure builds up in said passage to actuate the drain valve operator 23 and the how control valve 213 as heretofore explained.

Similarly, passage system 221 is circumferentially aligned with the port 225 at one end of passage 86 so that when groove 23 5 is in registry with said port the pressure in chamber 19 of the mixing valve shown in Fig. 2 is released, the liquid draining through passage 32, groove 234 and passage 235 into the bore 223 and thence through chamber 219 and passage 213 to the drain. When the solid portion of the pilot valve body is opposite the port 225 associated with passage 22, however, pressure builds up in said chamber 19 as heretofore explained, moving the valve member 33 toward the hot water port 351 so that cold water may be admitted for rinsing.

' Passage system 223, composed of the single cir cumferential groove 236, is in circumferential alignment with the port 225 which communicates with the end of passage 1119. Passage system 229 is in circumferential alignment with the port 225 in communication with the passage 91 so that when any of the grooves 231, 238 and 239 are in registry with said port the water may drain from passage 91 through said groove, and thence through the corresponding cross passage M0, 2M or 242, respectively, into the groove 236 which is permanently in communication with the passage I09. When the solid portions of body 220 are opposed to the port 225 that communicates with passage 91, however, pressure builds up in the chamber 92 to actuate the flow control valve I2 in the manner heretofore described.

As the operation of the component elements of the system has been explained in detail in connection with the description of the structure of such elements, it will here be sufiicient to summarize briefly the operation of the hydraulic control as a system.

The operator first determines the temperature at which the washing should be carried out and by manipulation of the stem I8 associated with the thermostat 39 positions the valve member 33 with respect to its ports 30 and 3| so that a mixture of hot and cold Water at a predetermined temperature is maintained in the chamber 36 of the mixing valve I4. The operator then turns shaft I68 to the position designed Start, whereupon contact element 206 drops down the step 232 bringing contacts 209 and 2I0 into engagement whereby the circuit through the timing motor IE5 is completed. This motor starts to rotate, and through the reduction gearing I70 to I87 and the coaction between the cam I89 and lever I94, the ratchet wheel I91 is started in a step by step motion. The rotation of shaft I53 from ratchet wheel I91, after a proper lapse of time, brings the cam 200 to the position wherein the contact element 205 drops down the step 202 to complete the circuit through the main motor associated with the tub. Rotation of the ratchet wheel I91 also effects rotation of the pilot valve member 220 in the step by step motion heretofore described to determine the cycle of operations constituting the program of the machine. cause of this step by step motion the control grooves in the pilot valve are brought abruptly into and out of communication with their ports 225 so that the gradual building up or release of pressure, as would occur if the pilot valve was rotated continuously and progressively, has been avoided.

Water at the thermostatically controlled temperature in the chamber 36 flows through nipple 85 and passage '86 to the chamber 96 of the flow control valve. At this time the interior of this chamber 98, by reason of the position of the pilot valve, is in open communication, through passage 91, with one of the grooves of passage system 229, groove 236, passage I09 and passage I I0 to drain, float operated valve I08 being open because of the absence of water in the tub. The differential pressure applied exteriorl to the end wall SI of chamber 92 holds the valve member 90 away from its seat at port 89, and the iii) 18 valve member in circumferential alignment with passage system 229 is opposite the port 225 in communication with passage 97 valve member is held closed irrespective of the position of float valve I08.

During the Washing step of the cycle the port 225 in communication with passage I34 is opposite the solid portion of valve member 220 that is in circumferential alignment with passage system 22E, whereby pressure is maintained on the valve operator 23 to hold the drain valve closed, and pressure is also maintained in chamber I30 to hold the valve member IT! in contact with its seat at port I23. This condition also continues during the rinsing cycle.

During the washing cycle the port 225 at the end of passage 8B is in communication with the groove 234 of passage system 227, so that any water bleeding through the hole 10 can drain off through said groove, passage 235, bore 223 and drain passage 2 l 8. When rinsing is to be effected, however, the solid portion of valve member 220 in circumferential alignment with groove 234 comes opposite the port 225 at the end of passage as, whereby water bleeding through the opening '56 equalizes the pressure in the chambers I9 and 83, whereupon spring 12 moves valve member 33 downwardly as viewed in Fig. 2 to decrease or terminate the inflow of hot water and permit the how of cold rinsing water through passage 86 to chamber 83, and thence through passage I I to the tub, passage 9? at this time being in communication with one of the grooves of passage system 229 and passage I05 being open because float I00 has opened valve member I08 when the wash water is drained from the tub. When the rinse water has risen to the proper height in the tub, however, float I00 actuates valve member I08 to close passage m5, whereby the pressure in the chamber 92 again builds up as heretofore explained to close valve member 90 against its seat at port 88.

During the washing and rinsing stages the valve member 528 is held in closed position by the pressure in chamber I30 and drain valve operator 23 holds the drain valve closed, because during the washing and rinsing stages a solid part of valve member 223 in circumferential alignment with passage system 226 is opposite the port 225 at the end of the passage I34. When the clothes are to be spun, either at the end of the washing stage or the rinsing stage, however, a groove in said passage system 226 is brought into registry with the port 225 at the end of passage I34. Pressure is thereb released in both the passage I34 and the passage I62, release of pressure in passage H52 effecting the operation of the operator 23 to open, the drain valve and release of pressure in passage I34; causing the unbalanced pressure acting on the end E2! of chamber I36 to open valve member I28. When valve member I28 is opened liquid under pressure is admitted to the chambers I2 I and H0, pressure in the former chamber conditioning the Hemmeter valve l8 and pressure in the chamber l2ll releasing the brake so as to initiate the spinning operation.

If the clothes are not properly distributed so that undue vibration arises, the plungers I52 and cylinders I53 develop pressure in chambers I55 which is transmitted to the chamber I51, where it is retained by the check valve M5, said pressure when it is developed to the proper magnitude acting on the movable end wall I38 of bellows I33 to move valve member I35 so as to close. the inlet I36 to passage I34, but without affecting the operation of the drain valve operator 23.

Closure of the inlet I35 results .in pressure building up :in chamber I30, whereby valve member 128 is closed, and leakage from the Hemmeter valve I8 causes the pressure in chamber iZU to be released so that the brake controlled by the operator I9 is applied to terminate the spinning operation and restore the movement characteristic of the washing operation so as to efiect a redistribution of the clothes. After a predetermined lapse of time, leakage past the valve member I45 or through the bleed opening there provided results in the pressure in chamber .15? being reduced so that spring :42 opens valve I35, whereby chamber 1-30 is again drained, valve 128 is opened and pressure is reintroduced into the chambers l2! and I23,

If the operator wishes to omit any of the steps in the automatic cycle he observes the indicating mechanism associated with the externally projecting end I65 of shaft I58, and when the step which he desires to omit has been reached, he turns the shaft 568 to the next step, the pawl I95 sliding on the teeth of ratchet wheel i 97.. In this Way as many steps may be'omitted as the operator desires, but thereafter the automatic cycle is resumed and continued until cam 2% reaches the position wherein contact element 28? drops down the step 232, and as this is the element common to the circuits of both the timing motor and the main motor, both of these circuits are opened and both motors stop.

By providing appropriate control areas on the valve member 22s the automatic cyclemay include any desired number of steps in sequence, and by properly proportioning the grooves in the control areas the instant of application or release of pressure to or from the pressure responsive devices controlling the beginning and end of the respective stages may be exactly predetermined.

It will therefore be perceived that an improved control particularly adapted for use in conjunction'with automatic washing machines has been provided wherein all of the control functions are effected by fluid pressure, the pressure used being derived from Water which may be taken from the usual water mains. the system are so constructed that injury will not be caused thereto even though the pressure in the mains be relatively high or vary from time to time. The control provides for readily omitting desired steps in the automatic cycle of the machine with assurance that the predetermined sequence of steps shall not be upset. The control facilitates 'predetermining the temperature "at which the washing shall be done, but any abnormal rise in temperature in the Water will not injure the thermostat. A single valve has been used for controlling both the flow of Wash water and rinse water. and the actuation of the mixing valve to admit warm water for washing or cool water for rinsing is under the control of the same pilot valve which efiects the control of the other stages of the automatic cycle. The water always rises to a predetermined level in the tub irrespective of how much water may be absorbed by the fabrics therein because the admission of water to the tub is controlled solely by the water level therein. The initiation of the spinning stage is controlled by the same pressure which conditions the Hemmeter valve, and if undue vibration arises from improper distribution of the clothes the spinning is promptly terminated to return to a motion that will redistribute the clothes, and this will recur as long as the improper distribution persists. The complexity incident to the use of The component elements of electric systems has been eliminated, and undesirable actions incident to the gradual building up .or release of pressure, retarding the initiation or termination of particular steps in the cycle, have been avoided. The system is simple and compact, positive in action, and composed of relatively few directly connected parts which are easy to standardize, inexpensive to manufacture, easy to assemble and service, and certain and efficient in operation.

It will also be perceived that while an improved mixing valve, improved timing mechanism, etc., have been provided and which are desirable subcombinations in the hydraulic control of the present invention viewed as an entire system, these and other subcombinations of the system are capable of other applications, and therefore it is to be expressly understood that it is within the contemplation of the present invention that such devices are applicable to wider uses than as parts of the hydraulic control herein disclosed.

While the embodiment of the invention illustrated on the drawings has been described with considerable particularity it is to be expressly understood that the invention is not to be limited thereto, as the same is capable of receiving a variety of mechanical expressions, some of which will now be apparent to those skilled in the art, While within the broader aspects of the present invention one or more'of the improved structures constituting components elements of the system may be replaced by other suitable forms of devices to perform comparable functions. Changes may also be made in the details of construction, arrangement, proportion, sizes, etc., some of the improved features may be used without others, the control may be adapted to a smaller or larger number of steps or stages in the automatic cycle of the machine or to effect other steps than herein discussed by way of example, and the control as a whole, while particularly adapted to use with an automatic washing machine, is also susceptible to other applications. Reference is therefore to be had to the appended claims for a definition of the invention.

What is claimed is:

1. In a hydraulic control, in combination with a plurality of valve elements to be controlled including a fluid mixing valve, means responsive to the temperature of said fluid for operating said mixing valve, a plurality of pressure motors respectively associated with said valve elements, each of said motors including an expansible and collapsible chamber and means providing a chamber exteriorly of said first named chamber and in communication therewith through a bleed opening, each of said motors having a passage individual to and communicating with one of said chambers and means for admitting liquid under pressure .to the other of said chambers, means providing a low pressure passage, a single pilot valve associated with all of said first named passages and including means for sequentially bringing the same into communication with said low pressure passage, said pilot valve including a casing having ports respectively in communication with said first named passages and a body movable in said casing and having passages for sequentially establishing communication between said ports and said low pressure passage, and .a timing motor operatively connected to said valve body.

2. In a hydraulic control, in combination with a plurality of valve elements to be controlled including a fluid mixing valve, means responsive to the temperature of said fluid for operating said mixing valve, a plurality of pressure motors respectively associated with said valve elements, each of said motors including an expansible and collapsible chamber and means providing a chamber exteriorly of said first named chamber and in communication therewith through a bleed opening, each of said motors having a passage individual to and communicating with one of said chambers and means for admitting liquid under pressure to the other of said chambers, means providing a low pressure passage, a single pilot valve associated with all of said first named passages and including means for sequentially bringing the same into communication with said low pressure passage, said pilot valve including a casing having ports respectively in communication with said first named passages and a body movable in said casing and having passages for sequentially establishing communication between said ports and said low pressure passage, a timing motor for moving said valve body, and a driving train between said timing motor and said valve body including a pawl and ratchet mechanism for abruptly bringing the passages in said valve body into and out of registry With said ports,

3. In a hydraulic control, the combination of z" a plurality of valve elements to be controlled including a fiuid mixing valve, means responsive to the temperature of said fluid for operating said mixing valve, a plurality of pressure motors respectively associated with said valve elements, each of said motors including an expansible and collapsible chamber and means providing, a chamber exteriorly of said first named chamber and in communication therewith through a bleed opening, each of said motors including means for admitting a liquid under pressure to one of said chambers and a pressure release passage communicating with the other of said chambers, each of said valve elements including an apertured seat and a valve member connected to one of said expansible and collapsible chambers to be movable relative to said seat by the equalization of pressure interiorly and exteriorly thereof through said bleed opening, and a single Ipilot valve for controlling the pressure in all of said .-1

pressure release passages.

4. In a hydraulic control, the combination of a plurality of valve elements to be controlled including a fluid mixing valve, means responsive to the temperature of said fiuid for operating said mixing valve, a plurality of pressure motors respectively associated with a plurality -o' f...said valve elements, each of said motors including an expansible and collapsible chamber and-means providing a chamber exteriorly of said first named chamber and in communication therewith through a bleed opening, each of said motors including means for admitting a liquid under pressure to one of said chambers and a pressure release passage communicating with the other of said chambers, each of said valve elements including an apertured seat and a valve member connected to one of said expansible and collapsible chambers to be movable relative to said seat by the equalization of pressure interiorly and exteriorly thereof through said bleed opening, a single pilot valve for controlling the pressure in all of said pressure release passages, said pilot valve including a casing provided with ports respectively in communication with said pressure release passages, means providing a low pressure passage and a rotatable valve body mounted in said casing and provided with passages for sequentially bringing each of said pressure release passages into communication with said low pressure passage, and a timing motor operatively connected to said valve body. 5. In a hydraulic control, the combination of a plurality of valve elements to be controlled including a fluid mixing valve, means responsive to the temperature of said fluid for operating said mixing valve, a plurality of pressure motors respectively associated with said valve elements, each of said motors including an expansible and collapsible chamber and means providing a chamber exteriorly of said first named chamber and in communication therewith through a bleed opening, each of said motors including means for admitting a liquid under pressure to one of said chambers and a pressure release passage in communication with the other of said chambers, each of said valve elements including an apertured seat and a valve member connected to one of said expansible and collapsible chambers to be movable relative to said seat by the equalization of pressure interiorly and exteriorly thereof through said bleed opening for controlling a port associated therewith, a single pilot valve for controlling the pressure in all of said pressure re lease passages, said pilot valve including a casing provided with ports respectively in communication with said pressure release passages, means providing a low pressure passage and a rotatable valve body mounted in said casing and provided with passages for sequentially bringing each of said pressure release passages in communication with said low pressure passage, a timing motor for rotating said valve body, and a driving train between said motor and said valve body including reduction gearing and a pawl and ratchet mechanism operated thereby and operatively connected to said valve body to advance said valve body periodically in a step by step motion.

6. In a hydraulic control, the combination of a thermostatically controlled mixing valve for predetermining the temperature of the water to be supplied, said valve including a casing providing a chamber for the mixture of the hot and cold water, hot and cold water passages in communication with said chamber, valve means for controlling said passages, and a thermostat operatively connected to said valve means and subjected to the temperature of the mixture in said chamber, saidthermostat including a movable wall, a stem operatively connected with said last named wall for adjusting the thermostat, an expansible and collapsible chamber having a movable wall engaging said stem and in communication with said first named chamber, means providing a chamber exteriorly of said expansible and collapsible chamber and communicating with said latter chamber through a bleed opening, means providing a pressure release passage in communication with said exterior chamber, a valve for controlling the pressure in said pressure release passage, and spring means cooperating with said last named movable wall and operable to move the same away from said stem and actuate said valve means to discontinue flow of water through said hot water passage when said release passage is closed and the liquid flowing through said bleed opening equalizes the pressure on the opposite sides of said last named movable wall.

'7. In a hydraulic control for automatic wash- 23 ing machines, the combination of a thermostati cally controlled mixing valve for predetermining the temperature of the water to be delivered,said valve including a chamber for the mixture of hot and cold water, means providing an outlet passage in communication with said chamber, hot and cold water passages in communication with said chamber, valve means for controlling the flow of water through said hot and cold'water passages, a thermostat subjected to the temperature of the mixture in said chamber and operatively connected to said valve means, a valve for controlling the flow of water through said outlet passage, pressure motors operatively connected to said last named valve and to said mixing valve for respectively controlling the flow from said chamber and for adjusting said mixing valve to deliver cold water, each of said pressure motors including an expansible and collapsible chamber and means providing a chamber exteriorly of said expansible and collapsible chamber and in communication therewith through a bleed opening, means providing pressure release passages individual to and communicating with each hot and cold water, means providing an outlet passage in communication with said chamber, hot and cold water passages in communication with said chamber, valve means for controlling the flow of water through said hot and cold water passages, a thermostat subjected to the temperature of the mixture in said chamber and operatively connected to said valve means, a valve for controlling the flow of water through said outlet passage, pressure motors operatively connected to said last named valve and to said mixing valve for respectively controlling the flow from said chamber and for adjusting said mixing valve to deliver cold water, each of said pressure motors including an expansible and collapsible chamber and means providing a chamber exteriorly of said expansible and collapsible chamher and in communication therewith through a bleed opening, means providing pressure release passages individual to and communicating with each of said pressure motors, a single pilot valve for opening and closing said pressure release passages and actuating said pressure motors, said pilot valve including a casing, mean providing a low pressure passage in communication with said casing, a valve body mounted in said casing and provided with passages for sequentially bringing said low pressure passage into communication with said pressure release passages, and a timing motor operatively connected to said valve body.

9. In a hydraulic control for automatic washing machines, the combination of a thermostatically controlled mixing valve for predetermining the temperature of the water to be delivered, said valve including a chamber for the mixture of hot and cold water, means providing an outlet passage in communication with said chamber, hot and cold water passages in communication with said chamber, valve means for controlling the flow of water through said hot and cold water passages, a thermostat subjected to the temperature of the mixture in said chamber and operatively connected to said valve means, a valve for controlling the flow of water throughsaid out- .let passage, pressure motors operatively connected to said last named valve and to said mixing valve for respectively controlling the flow from said chamber and for adjusting said mixing valve to deliver cold water, each of said pressure motors including an expansible and collapsible chamber and means providing a chamber exteriorly of said expansible and collapsible chamber and in communication therewith through a bleed opening, means providing pressure release passages individual to and communicating with each of said pressure motors, a single pilot valve for opening and closing said pressure release passages and actuating said pressure motors, said pilot valve including a casing, means providing a plurality of low pressure passages in communication with said casing, a valve body mounted in said casing and provided with passages for sequentially bringing a low pressure passage into communication with said pressure release passages, a timing motor operatively connected to said valve body, and a float control valve associated with one or" said low pressure passages.

10. In a hydraulic control for automatic washing machines, the combination of a Hemmeter valve provided with a chamber for liquid under pressure, a brake operator including a pressure motor in communication with said chamber, means for controlling the application of pressure liquid to said chamber and motor including a valve, an expansible and collapsible chamber operatively connected to said valve, means providing a chamber exteriorly of said expansible and collapsible chamber and communicating therewith through a bleed opening, means providing an inlet for introducing liquid under pressure into said last named chamber, means providing an outlet passage from said expansible and collapsible chamber, and means for control-ling the flow of liquid through said outlet passage to determine whether or not pressure shall be developed through said bleed opening in said expansible and collapsible chamber.

11. In a hydraulic control for automatic washing machines, the combination of a Hemmeter valve provided with a chamber for liquid under pressure, a brake operator including a pressure motor in communication with said chamber, means for controlling the application of pressure liquid to said chamber and motor including a valve, an expansible and collapsible chamber operatively connected to said valve, means providing a chamber exteriorly of said expansibleand collapsible chamber and communicating therewith through :a bleed opening, means providing an inlet for introducing liquid under pressure into said last named chamber, means providing an outlet passage from said expansible and collapsible chamber, and means for controlling the flow of liquid through said outlet passage to determine whether or not pressure shall be developed through said bleed opening in said expansible and collapsible chamber, said last named means including a valve controlling said outlet passage and a timing motor operatively connected to said valve.

12. In a hydraulic control for automatic washing machines, the combination of a Hemmeter valve provided with a chamber for liquid under pressure, a brake operator including a pressure motor in communication with said chamber, means for controlling the application of pressure liquid to said chamber and motor including a valve, an expansible and collapsible chamber operatively connected to said valve, means providing a chamber exteriorly of said expansible and collapsible chamber and communicating therewith through a bleed opening, means providing an inlet for introducing liquid under pressure into said last named chamber, means providing an outlet passage from said expansible and collapsible chamber, and means for controlling the flow 01 liquid through said outlet passage to determine whether or not pressure shall be developed through said bleed opening in said expansible and collapsible chamber, said last named means including a pressure responsive device and means operable by vibration to develop pressure in said pressure responsive device,

13. In a hydraulic control for automatic washing machines, the combination of a Iiemmeter valve provided with a chamber for liquid under pressure, a brake operator including a pressure motor in communication with said chamber, means for controlling the application of pressure liquid to said chamber and motor including a valve, an expansible and collapsible chamber operatively connected to gain valve, means providing a chamber exteriorly of said expansible and collapsible chamber and communicating therewith through a bleed opening, means providing an inlet for introducing liquid under pressure into said last named chamber, means providing an outlet passage from said eicpansible and collapsible chamber, a valve for opening and closing said outlet passage, a pressure motor for operating said valve, and means responsive to vibration for developing pressure in said pressure motor and operating said valve to close said outlet passage.

14. In a hydraulic control for automatic washing machines, the combination of a Hemmeter valve provided with a chamber for liquid under pressure, a brake operator including a pressure n tor in communication with said chamber, means for controlling the application of pressure liquid to said chamber and motor including valve, an expansible and collapsible chamber op atively connected to said valve, means providi a chamber exteriorly of said expansible and collapsible chamber and communicating therewith through a bleed opening, means providing an inlet for introducing liquid under pressure into said last named chamber, means providing an outlet passage from said expansible and collapsible chamber, a valve for opening and closing said outlet passage, a pressure motor for operating said valve, means for developing pressure in said pressure motor, a passage for connecting said last-named means to said pressure motor, and a check valve for controlling said passage and providing for a leakage return to said passage to relieve the pressure in said pressure motor after a predetermined period of time.

157 In a hydraulic control for automatic washing machines, the combination of a Hemmeter valve provided with a chamber for liquid under pressure, a brake operator including a pressure motor in communication with said chamber, means for controlling the application of pressure liquid to said chamber and motor including a valve, an expansible and collapsible chamber operatively connected to said valve, means providing a chamber exteriorly of said expansible and collapsible chamber and communicating therewith through a bleed opening, means providing an inlet for introducing liquid under pressure into said last named chamber, means providing an outlet passage from said expansible and collapsible chamber, a valve for opening and closing said outlet passage, a pressure motor for operating said valve, means for developing pressure in said pressure motor, a passage connecting said last named means with said pressure motor, and a time delay valve associated with said passage for predetermining the rate of liquid flow therethrough.

16. In a hydraulic control for automatic washing machines, the combination of a Hemmeter valve provided with a chamber for liquid under pressure, a brake operator including a pressure motor in communication with said chamber, means for controlling the application of pressure liquid to said chamber and motor including a valve, an expansible and collapsible chamber operatively connected to said valve, means providing a chamber exteriorly of said eXpansible and collapsible chamber and communicating therewith through a bleed opening, means providing an inlet for introducing liquid under pressure into said last named chamber, means providing an outlet passage from said expansible and collapsible chamber, means providing a, low pressure passage, a valve for placing said outlet passage in communication with said low pressure passage, and means responsive to vibration for opening and closing said outlet passage independently of said last named valve.

17. In a hydraulic control for automatic washing machines, the combination of a Hemmeter valve provided with a chamber for liquid under pressure, a brake operator including a pressure motor in communication with said chamber, means for controlling the application of pressure liquid to said chamber and motor including a valve, an expansible and collapsible chamber operatively connected to said valve, means providing a chamber exteriorly of said expansible and collapsible chamber and communicating therewith through a bleed opening, means providing an inlet for introducing liquid under pressure into said last named chamber, means providing an outlet passage from said expansible and collapsible chamber, means providing a low pressure passage, a valve for placing said outlet passage in communication with said low pressure passage, 9, second valve for opening and closing said outlet passage, a pressure motor for operating said second valve, and means responsive to vibration for developing a pressure in said last named pressure motor and operating said second valve to close said outlet passage independently of the position of said first named valve.

18. In a hydraulic control for automatic washing machines, the combination of a Hemmeter valve provided with a chamber for liquid under pressure, a brake operator including a pressure motor in communication with said chamber, means for controlling the application of pressure liquid to said chamber and motor including a valve, an expansible and collapsible chamber operatively connected to said valve, means providing a chamber exteriorly of said expansible and collapsible chamber and communicating therewith through a bleed opening, means providing an inlet for introducing liquid under pressure into said last named chamber, means providing an outlet passage from said expansible and collapsible chamber, means providing a low pressure passage, a valve for placing said outlet passage in communication with said low pressure passage, a second valve for opening and mining the period of time during which said pressure motor retains said second valve in posi-' tion for closing said outlet passage.

19. In a hydraulic control for automatic washing machines, the combination of a Hemmeter valve provided with a chamber for liquid under pressure, a brake operator including a pressure motor in communication with said chamber, means for controlling the application of pressure liquid to said chamber and motor including a valve, an expansible and collapsible chamber operatively connected to said valve, means providing a chamber exteriorly of said expansible and collapsible chamber and communicatin therewith through a bleed opening, means providing an inlet for introducing liquid under pressure into said last named chamber, means providing an outlet passage from said expansible and collapsible chamber, a drain valve operator including a pressure motor connected to said outlet passage, and a valve for controlling the now of liquid through said outlet passage to determine simultaneously whether or not pressure shall be developed through said bleed opening in said expansible and collapsible chamber and whether or not said drain valve operator shall be actuated.

20. In a hydraulic control for automatic Washing machines, the combination of a Hemmeter valve provided with a chamber for liquid under pressure, a brake operator including a pressure motor in communication with said chamber, means for controlling the application of pressure liquid to said chamber and motor including a valve, an expansible and collapsible chamber operatively connected to said valve, means providing a chamber exteriorly of said expansible and collapsible chamber and communicating therewith through a bleed opening, means providing an inlet for introducing liquid under pressure into said last named chamber, means providing an outlet passage from said expansible and 'collapsible chamber, a drain valve operator including a pressure motor connected to said outlet passage, a valve for controllin the flow of liquid through said outlet passage to determine simultaneously whether or not pressure shall be developed through said bleed Opening in said expansible and collapsible chamber and whether or not said drain valve operator shall be actuated, and means responsive to vibration for closing said outlet passage and operating said first named valve independently of the position of said last named valve.

21. In a hydraulic control for automatic washing machines, the combination of a Hemmeter valve provided with a chamber for liquid under pressure, a brake operator including a pressure motor in communication with said 7 chamber, means for controlling the application of pressure liquid to said chamber and motor including a valve, an expansible and collapsible chamber operatively connected to said valve, means provid ing a chamber exteriorl-y of said expansible and collapsible chamber and communicating therewith through a bleed opening, means providing an inlet for introducing liquid under pressure into said last named chamber, means providing an outlet passage from said expansible and collapsible chamber, a drain valve operator including a pressure motor connected to said outlet passage, a valve for controlling the flow of liquid through said outlet passage to determine simultaneously whether or not pressure shall be developed through said bleed opening in said expansible and collapsible chamber and whether or not said drain valve operator shall beactuated, means for closing said outlet passage to operate said first named valve independently of the position of said last named valve including a valve in said outlet passage, a pressure motor operatively connected to said last named valve, and means responsive to vibration for developing pressure in said last named pressure motor.

22. In a hydraulic control for automatic washing machines, the combination of a Hemmeter valve provided with a chamber for liquid under pressure, a brake opeartor including a pressure motor in communication with said chamber, means for controlling the application of pressure to said chamber and motor including a, valve, means for operating said valve, and means responsive to the vibration for actuating said last named means to close said valve and exclude pressure liquid from said first named chamber.

23. In a hydraulic control for automatic washing machines, the combination of a Hemmeter valve provided with a chamber for liquid under pressure, a brake operator including a pressure motor in communication with said chamber, means for controlling the application of pressure to said chamber and motor including a valve, means for operating said valve including a pressure motor, and mean responsive to vibration for determining whether or not pressure fluid shall actuate said pressure motor.

24. In a hydraulic control for automatic Washing machines, the combination of a Hemmeter valve provided With a chamber for liquid under pressure, a brake operator including a pressure motor in communication with said chamber, means for controlling the application of pressure to said chamber and motor including a valve, means for operating said valve including a pressure motor, a valve for controlling the application of pressure to said pressure motor, a pressure motor for operating said last named valve, and a pressure device responsive to vibration for developing pressure in said last named pressure motor.

25. In a hydraulic control, the combination of a plurality of valve elements to be controlled including a fluid mixing valve, means responsive to the temperature of said fluid. for operating said mixing valve, a plurality of pressure motors respectively associated with said valve elements, a pilot valve operatively connected to all of said pressure motors for operating the same in predetermined sequence, and timing mechanism for operating said pilot valve including av motor, a coaxial system of planetary gearing driven by said motor, a pawl oscillated by said gearing, and a ratchet wheel operated. by said pawl and operatively connected to said pilot valve.

26. In a hydraulic control, the combinationoi a plurality of valve elements to be controlled including. a fluid mixing valve, means responsive to the temperature of said fluid for operating said mixing valve, a plurality of pressure motors respectively associated with said valve elements, a pilot valve operatively connected to all of said pressure motors for operating the same in predetermined sequence, and timing mechanism for operating said pilot valve including a motor, reduction gearing driven by said motor, a cam driven by said gearing, a pivoted lever having a camshaped opening cooperating with said cam and carrying a pawl, and a ratchet wheel cooperating with said pawl and operatively connected to said pilot valve.

27. In a hydraulic control, the combination of a plurality of valve elements to be controlled including a fluid mixing valve, means responsive to the temperature of said fluid for operating said mixing valve, a plurality of pressure motors operatively connected to said valve element respectively, a pilot valve, and means providing passages op-eratively connecting the respective pressure motors with said pilot valve, said pilot valve including a casing having ports in communication with the respective passages, a rotatable body in said casing provided with passages for registry with said ports, and means for rotating said valve body including a, manually operable shaft connected to said valve body, a motor rotatable around said shaft, reduction gearing driven by said motor and including planetary gearing disposed coaxialiy with said shaft, and means connecting said reduction gearing with said valve body.

28. In a hydraulic control, the combination of a plurality of valve elements to be controlled including a fluid mixing valve, mean responsive to the temperature of said fluid for operating said mixing valve, a plurality of pressure motors operatively connected to said valve elements respectively, a pilot valve, and means providing passages operatively connecting the respective pressure motors with said pilot valve, said pilot valve including a casing having port in communication with the respective passages, a rotatable body in said casing provided with passages for registry with said ports, means for rotating said valve body including a manually operable shaft connected to said valve body, a motor rotatable around said shaft, reduction gearing driven by said motor, and means for rotating said valve body from said reduction gearing including a pawl and ratchet mechanism operable to rotate said valve body in one direction and prevent manual rotation of said valve body in the opposite direction.

29. In a hydraulic control, the combination of 4' passages operatively connecting the respective pressure motors with said pilot valve, said p-ilot valve including a casing having ports in communication with the respective passages, a rotatable body in said casing provided with passages for registry with said ports, means for rotating said valve body including a manually operable shaft connected to said valve body, a motor rotatable around said shaft, reduction gearing driven by said motor, and means for rotating said valve body from said reduction gearing including a cam driven by said reduction gearing, a pivoted lever having a cam-shaped opening cooperating with said cam and carrying a, pivoted pawl, and a ratchet wheel cooperating with said pawl and operatively connected to said valve body.

30. In a hydraulic control, the combination of a plurality of valve elements to be controlled including a fluid mixing valve, means responsive to the temperature of said fluid for operating said mixing valve, a plurality of pressure motors operatively connected to said valve elements respectively, a pilot valve, and means providing passages op-erativ-ely connecting the respective pressure motors with said pilot valve, said pilot valve including a casing having ports in communication with the respective passages, a rotatable body provided with passages for registry with said ports, mean for rotating said pilot valve including a manually operable shaft connected to said valve body, a motor rotatable around said shaft, reduction gearing driven by said motor, a pawl and ratchet for driving said valve body from said reduction gearing, said shaft being driven from said ratchet, and means for stop-ping said motor driven by said shaft.

CHARLES D. BRANSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,799,113 Miedbrodt Mar. 31, 1931 2,030,092 Benson Feb. 11, 1936 2,064,053 Balzer Dec. 15, 1936 2,187,465 Simonick Jan. 16-, 1940 2,200,226 Larson May 7, 1940 2,258,360 Hetzer Oct. 7, 1941 2,320,011 Reynolds May 25, 1943 2,391,492 Turchan Dec. 25, 1945 2,444,631 Chace July 6, 1948 2,453,707 Graham Nov. 16, 1948 2,475,503 Holthouse July 5, 1949 2,478,702 Moody Aug. 9, 1949