[go: up one dir, main page]

US2995143A - Timer - Google Patents

Timer Download PDF

Info

Publication number
US2995143A
US2995143A US79978059A US2995143A US 2995143 A US2995143 A US 2995143A US 79978059 A US79978059 A US 79978059A US 2995143 A US2995143 A US 2995143A
Authority
US
United States
Prior art keywords
interval
switch
timer
circuit
motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
Other languages
English (en)
Inventor
Donald M Strathearn
James M Thornbery
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Controls Company of America
Original Assignee
Controls Company of America
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NL249476D priority Critical patent/NL249476A/xx
Priority to US79978059 priority patent/US2995143A/en
Application filed by Controls Company of America filed Critical Controls Company of America
Priority to GB218260A priority patent/GB949542A/en
Priority to GB429862A priority patent/GB949545A/en
Priority to GB4102263A priority patent/GB949551A/en
Priority to GB430162A priority patent/GB949548A/en
Priority to GB3192763A priority patent/GB949549A/en
Priority to GB430062A priority patent/GB949547A/en
Priority to GB429962A priority patent/GB949546A/en
Priority to FR818127A priority patent/FR1252261A/fr
Priority to BE587629A priority patent/BE587629A/fr
Priority to DE19601413714 priority patent/DE1413714A1/de
Priority to US3564279D priority patent/US3564279A/en
Application granted granted Critical
Publication of US2995143A publication Critical patent/US2995143A/en
Priority to US27609D priority patent/USRE27609E/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H43/00—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed
    • H01H43/10—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to a part rotating at substantially constant speed
    • H01H43/12—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to a part rotating at substantially constant speed stopping automatically after a single cycle of operation
    • H01H43/124—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to a part rotating at substantially constant speed stopping automatically after a single cycle of operation using a disc
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/18—Washing liquid level
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/02—Water supply
    • D06F2105/04—Water supply from separate hot and cold water inlets
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/08—Draining of washing liquids
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/52—Changing sequence of operational steps; Carrying out additional operational steps; Modifying operational steps, e.g. by extending duration of steps
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/58—Indications or alarms to the control system or to the user
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7287—Liquid level responsive or maintaining systems
    • Y10T137/729—Washing machine cycle control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86389—Programmer or timer

Definitions

  • Sequence timers operating on rotation of a drum can be visualized as having 360 rotation available for containing the desired programs. Each program requires a portion of the 360 available and it will be obvious that the :greater the number of programs provided, the less space is available between programs. This space is utilized as a starting point and as the space is reduced the manual selection of the desired space becomes increasingly difficult until it becomes unreasonably diflicult without mechanical or electro-mechanical assistance.
  • An object of this invention is to simplify the structure of Thornbery et al. and particularly to simplify the high speed drive. This has been done by having the high speed positioning motor drive the timer cam drum through the slow speed drive mechanism as compared to the Thombery et al. arrangement utilizing two separate drives.
  • Another object of this invention is to provide means for increasing the functions possible within an interval of a timer sequence. This has been accomplished by what is called sub-interval switching which in a sense is like a separate timer having a switching sequence which may be selected by the main timer during any desired interval to thereby provide a sub-sequence within a given interval of the sequence provided by the main timer. This makes possible the maximum utilization of an interval. Thus, while the timer remains at an interval for one minute, for example, the function may take less time and the remainder of the interval is, in effect, wasted. However, with sub-interval switching the first portion of an interval may provide for (in a washing machine) rinse the remainder may be drain.” This may be accomplished in one interval.
  • Sub-interval switching has the eifect of increasing the number of intervals without having to reduce the increment. Therefore, the sub-interval switching makes "ice possible more programs in a timer of given size and interval.
  • a further advantage is realized in that the timer can not be advanced or reversed manually by actuation of the timer shaft. The latter feature allows an indicator to be mounted on the shaft, if desired, without fear that the operator will attempt to set the timer manually.
  • Another object of the invention is to provide a seeking circuit incorporating novel features of program selection whereby one selection switch can sequentially select two programs which should follow each other. Another feature of the circuit is the automatic selection of an off position in the event the selection switches are improperly actuated.
  • FIGURE 1 is a top plan view of the timer
  • FIGURE 2 is a front elevation, partly in section
  • FIGURE 3 is a view of the printed circuit board utilized in connection with the searching circuit
  • FIGURE 4 is a view of the drive mechanism
  • FIGURE 5 is another view taken to show the general switching arrangement of both the main timer and of the sub-interval switching
  • FIGURE 6 is a view through the shaded pole motor and showing the switch operated by the motor when energized;
  • FIGURE 7 is similar to FIGURE 6 but shows the motor in its energized position
  • FIGURE 8 is a schematic representation of the searching circuit and mechanism
  • FIGURE 9 is a wiring diagram for both the searching circuit and the entire washing machine and timer circuit
  • FIGURE 10 is a schematic representation of the subinterval switching sequence
  • FIGURES 11, A and B show the program achieved by the present arrangement.
  • the structure shown is built around a basic interval timer different from the usual timer only in that it has a great number of programs available within the 360 of rotation.
  • the timer is provided with a pair of terminal boards 20, 22 which carry the program switches generally designated 24.
  • the terminal boards are carried between end plates 26, 28 and the switches are provided with cam followers which act on cams 30 carried on arbor '32.
  • the end plate 28 has a printed circuit thereon as indicated in FIGURE 3.
  • the arbor 32 is journalled in the end plates for rotation and carries a drive ratchet 34 which is adapted to receive the impulses from the timer motor 36 or from the shaded pole motor 38.
  • end plate 26 carries pawl 39 loaded by spring 42 into engagement with the teeth on the drive ratchet 34 to prevent reverse rotation of the timer arbor.
  • pawl 39 loaded by spring 42 into engagement with the teeth on the drive ratchet 34 to prevent reverse rotation of the timer arbor.
  • the timer motor drives the ratchet through a novel drive mechanism.
  • the motor 36 includes, as is customary, a gear reduction in the larger part of the motor housing and also includes an overrunning clutch (not shown) which may be of any desired construction, to turn the motor shaft 40 in a counter-clockwise direction.
  • the shaft carries a molded disc including the cam 41.
  • the purpose of this cam is similar to that of the prior art in that it gradually builds up energy in the drive mechanism and at its drop permits a rapid delivery of this energy through the drive to the arbor.
  • a lowtorque motor can be used to deliver a high torque impulse.
  • the cam drop is preferably of the slow drop type described more fully in co-pending application Serial Number 520,946, now Patent Number 2,934,618.
  • Lever or link 44 is pivoted on post 46 and is biased by spring 48 hearing against the frame and wound around the post to act against the vertical portion of the link (FIGURE 2) to force the follower portion 50 into contact with the periphery of the cam 41.
  • the left end (FIGURE 4) of lever 44 carries verge 52 pivoted on pin 54.
  • the toe or leading tooth 56 of the verge is biased into constant contact with ratchet 34- by spring 58.
  • the heel or trailing tooth 60 will lift out of the teeth after each impulse.
  • the lever 44 will rock in a clockwise direction slowly and the toe 56 of verge 52 will ride up the sloping portion of the next rearward ratchet tooth and shortly before the impulse is given to the lever the toe will drop into the next notch on the ratchet ready for delivery of the power stroke or impulse.
  • the follower reaches the drop portion of the cam 41, the lever will rapidly rock in a counter-clockwise direction about its pivot 46 and drive the toe 56 against the ratchet.
  • the verge 52 will rock about its pivot in a clockwise direction to jam the heel 60 into a corresponding ratchet tooth as may be seen in FIGURE 4.
  • the cam 41 is carried on a disc 62, the periphery of which is in the form of a gear engaging pinion 64 which is adapted to be driven by the shaded pole motor 38.
  • the shaded pole motor is de-energized as shown in FIGURE 6, the pinion is not connected to the motor since spring 66 biases the rotor 68 upwardly to move the clutch half 70 out of engagement with the clutch half 72 connected to the gear 64.
  • the motor is energized, as shown in FIGURE 7, the rotor is pulled between the shaded poles 74 with a solenoid action and the upper clutch half 70 is pulled down into engagement with the lower clutch half 72 and the rotor of the shaded pole motor is connected to gear 64 to, in turn, transmit power to gear disc 62.
  • FIGURES 6 and 7 A further feature to be noted in FIGURES 6 and 7 is that the lower end of the rotor shaft 76 is provided with a switch actuating boss 78 bearing on the actuating end of the switch blade 80 of a rather conventional snap acting switch.
  • the switch .4 contact 82 is acting on the lower stationary contact 84.
  • the switch blade is moved down and throws the switch overcenter so the contact 82 now contacts the upper fixed contact 86.
  • This transfer switch will be pointed out more fully hereinafter in connection with the wiring diagram.
  • FIGURE 4 it will be noted that there is shown in dotted lines on disc 62, a number of face cams which are on the underside of the disc and may be seen in part in FIGURE 2. These cams actuate a group of switches only one of which need be considered at this moment.
  • the inside cam 88 is designed to actuate follower 90 (FIGURE 5 which, in turn, actuates the searching switch SS to open the switch SS once for each revolution of the disc.
  • FIGURE 3 which illustrates the printed circuit found on the end panel 28, it should be noted that the brush wiper 92 carried by the arbor for rotation therewith (FIGURES 2 and 5) wipes three circular paths on the printed circuit.
  • the middle arm 94 runs on the inner circular track while the middle wiper arm 96 runs on the outer portion of the nearly circular path 98 so as to overlie the cutout portions of the track.
  • the outer wiper arm 100 wipes on the inner end of the various fragments which generally line up with the notches in the middle track 98.
  • FIGURE 8 shows the essential portions of the circuit.
  • This figure incidentally, shows the circuit relationship of the printed circuit and the brush 92 rather clearly and demonstrates that the brush merely acts as a jumper in the circuit arrangement.
  • the small circular segments on the periphery of the representation of the printed circuit correspond to the fingerlike projections opposite the notches in FIGURE 3. Due to space, they cannot actually be placed as in FIGURE 8 and, hence, it is necessary to have the brush provided with two wipers.
  • the printed circuit here is shown with four possible stopping points which are referred to as M, N, O and P which are regulated by normally closed switches as SM, SN, SO, and SP. These switches constitute the cycle selection switches.
  • momentary switch 102 There is also a normally open momentary switch 102 and the cycle selection switches are so designed that actuation of one of these switches will also actuate the momentary switch 102.
  • switch SM for example, is actuated, the momentary switch will be closed and the switch SM will be opened. Closure of the momentary switch will energize the shaded pole motor through the printed circuit and the brush.
  • This circuit is as follows: L1 to the lead 104 through the motor winding 106 to junction 108 and from there through lead 110 to the printed circuit board, through the wiper, to lead 112 and line 114 to the momentary switch 102 and from thence to line 116 to contact 84 on the motor switch 82 to line L2.
  • FIGURE 8 The simplified diagram of FIGURE 8 should make the operation of the searching circuit quite clear. It should be noted that due to the fact that the searching switch SS is normally closed and is closed during the advance of the brush, the printed circuit is, during the impulse, shunted by the searching switch. Between each impulse imparted to the timer and its brush 92, the searching switch opens and, hence, the testing of the circuit condition is, in effect, accomplished at the searching switch rather than at the brush and thus avoids switching on the printed circuit board which could conceivably have adverse affects. It should be noted, however, that as further experience is gained both with respect to printed circuit boards and with respect to the capacities of a timer arrangement of this type, it appears more and more likely that the searching switch can be eliminated if desired.
  • the searching circuit With the understanding of the searching circuit gained from the consideration of FIGURE 8, the complete wiring diagram of the timer, the searching circuit and the washing machine can now be considered, noting, however, that the circuit to be described now is merely representative of one type of circuit and the present invention can be applied to many types of control circuits. Furthermore, it should be noted that in the system shown here the searching arrangement seeks an open circuit. The system can readily be modified to seek a closed circuit when desired. Such a circuit is shown in the co-pending application of Thornbery et a1. Serial Number 799,781.
  • the printed circuit is here represented by the dark strip over which the brush 92 travels in the direction indicated by the arrow labeled rotation.
  • the various starting points which may be selected by operating one of the cycle selection switches.
  • These switches bear the legend S1, S3 etc. with the S standing for cycle selection switch and the nuumeral 1 indicating the starting point at interval number 1, for example.
  • a switch S68 there is shown a switch S68 and this indicates the same switch may be actuated to position the brush and, hence, the timer to start at either interval 6 or 8 and the purposes underlying this will be explained more fully hereinafter.
  • this wiring diagram illustrates the searching switch SS and the shaded pole motor switch 82, the latter being shown in two locations in order to indicate its functions completely.
  • the momentary switch 102 is also shown. With the showing of FIG- URE 8 in mind, it will be easy to determine the manner of operation. For example, actuation of one of the normally closed cycle selection switches will, as mentioned above, also actuate the momentary switch 102.
  • the shaded pole motor will rapidly advance the timer and its brush through the sequential intervals searching for the open circuit.
  • the searching switch SS will open to allow the circuit condition to be tested. For example, if the selection switch S11 had been opened, the brush would continue around the timer until it landed at S11 and the searching switch SS opens so that the circuit through the shaded pole motor would have to pass through the printed circuit board. At this time, since the switch S11 is open, the current flow to the shaded pole motor will be interrupted and the rotor will retract to reverse the position of the switch 82. This, in turn, will allow current flow to the timer motor 36.
  • FIG- URES 11A and B show a sample program available with this arrangement.
  • the cycle selection switches (FIGURE 9) bear the numerals indicating the interval at which the timer will be stopped in its rapid advance. These intervals correspond to those intervals shown on FIGURE 11 under the interval column and constitute the start of difiercnt programs.
  • FIGURE 11 also shows, in the various labeled columns, the condition of the various switches operated by the timer cams. These switches 1, 2, 3, 4 etc. appear in the lower portion of FIGURE 9 and control the washing machine apparatus or functions associated therewith as indicated on the diagram (FIGURE 9) as well as on the chart of FIGURE 11. The chart is easy to read.
  • the wash light (merely an indicator light) will be energized as will be the main motor through timer cam switch 3, the timer will be in circuit with the closed switch 9 and switches 14 and 15 will also be closed.
  • the washing machine is provided with a pressure switch 126 and, of course, at the start of this cycle, the empty contact will be made.
  • the timer motor 36 will not be energized until such time as the pressure switch acts to make the full cont-act.
  • the solenoid actuating the hot water valve will be open and the tub will start to fill.
  • the pressure switch When the desired level has been reached, the pressure switch will transfer to the full contact whereupon the timer motor will start operation. Thus, even though the tub may take four minutes to fill, only one interval has been utilized for the fill operation and a full minute of time remains to be used after the filling before the next step of the stepping mechanism.
  • the cycle selection switches are coupled with a switch S40 which will be open if all the selection switches are closed.
  • a switch S40 which will be open if all the selection switches are closed.
  • the switch arrangement is so designed that if all the cycle selection switches are closed, the switch S40 will be open and this, as can be seen by reference to the chart in FIGURE 11, is an o position and, hence, no harm has been done and the machine will not continuously run searching for a condition which does not exist.
  • the gear disc 62 was provided with a plurality of circular face cams, the inner one of which operates the search switch SS. There are additional cams on the disc which operate what we term sub-interval switches. Now then, starting from the inner cam, which operates the searching switch, the next cam track (progressing outwardly towards the periphery of the disc) will operate the sub-interval switch D through the follower 128 cooperating with switch labeled SD. The next cam track (progressing outwardly) operates switches SC and SE while the outermost cam track operates the sub-interval switches SA and SB.
  • FIGURE 10 there is shown a chart of the sequence of operation of the subinterval switches.
  • the rectangle in which the labeled rectangles appear represents, from left to right, one interval as a matter of time and thus progressing from the lefthand margin, it will be noted that shortly after the start of an interval, switch SA is made and remains closed for approximately /3 of a cycle. Switch SA is thereupon opened and switch SB closes. At this time, switch SE also closes. SB remains closed for approximately 6 of a cycle and then opens, followed shortly by the closure of SC. SD closes shortly before the opening of SB and SD remains closed into the next interval as indicated by the small portion on the lefthand margin.
  • the sub-interval switches are included in the main timer circuit as indicated in FIGURE 9 and consideration of FIGURE 9 in combination with the chart of FIGURE 11 will now demonstrate the novel functions possible through such an arrangement.
  • the same interval is used both for a rinse and for draining. Under former practice, this was obviously incompatible since the drain pump would have to be energized at the same time it was desired to fill the tub.
  • an analysis will show the practicality of the present arrangement.
  • the pump solenoid switch 8 is closed but it cannot operate the pump until SC also closes. Hence, the pump cannot operate until the last third of the interval.
  • the timer motor 36 is connected to the power supply through the level switch and cam switch 9 which means that upon the timer dropping into interval 17, the timer motor will turn off and will stay off until the tub has been filled. This has the effect of stretching the interval to one long enough to allow the tub to fill regardless of the time required. It is obvious that the draining operation which, as explained before, can only occur during the latter third of the interval, would not be very effective if the tub were simultaneously undertaking to fill. Therefore, the fill is controlled through timer switch 13 which is in series with switch SA. Also closed at this time are the hot and cold solenoids 15 and 18.
  • the circuit passes through the pressure switch and switch SA and the timer switch 13 to the solenoids and causes filling which will continue with the timer total- 1y at rest until the pressure switch trips to close the full contact and this will then reenergize the timer.
  • the timer having been re-energized, the sub-interval switching resumes operation and, before long, the switch SA will open and no more filling can occur.
  • subinterval switch SC closes in series with timer switch 8
  • sub-interval switch SE which is in circuit with the timer 36 shunting the timer line switch 10. Obviously the line switch 10 could not have been closed during all this operation since a complete fill for the rinse purposes would not have been accomplished. It will be apparent, therefore, that the use of the sub-interval switching has accomplished within one interval, the functions which would normally require at least two intervals. Furthermore, due to the arrangement of the sub-interval switching, a greater period of time has been spent in the interval than the actual theoretical duration of the interval.
  • the fill alone could take four or five minutes and there is still time within this interval to effect the draining operation.
  • Another advantage in this system is that where the function desired requires less time than a complete interval, the complete interval need not be devoted to accomplishment of the function. Thus, the draining can be accomplished within about /3 of the interval.
  • interval SD extends into the subsequent interval and this is to insure against the spin solenoid and the associated transmission being de-energized and re-energized between intervals.
  • sub-interval switching are much the same in the other intervals where the sub-interval switches are cut into the circuit except that in interval 36, for example, during which the drain pumps are working constantly, there is a spray during subinterval B.
  • the pump pulls down the water level so that the pressure switch will trip over to the empty contact and when SB is made the circuit through the closed timer switch 18 will be made to energize the cold solenoid and give a cold spray.
  • the sub-interval switch SB is not effective unless the pressure switch is in the empty position and either or both of the water solenoids 15 and 18 are closed.
  • the cycle selection switch 56-8 in effect, provides two stopping points, reference to the chart will demonstrate the purposes of the two starting points.
  • the tub gets a hot fill and agitation for the interval (6) period and then in interval 7, the machine turn off. This permits the clothes to be soaked the machine may be loaded and the 86-8 actuated and the housewife may then leave the scene with the knowledge that the machine will turn off and allow the clothes to soak.
  • she presses the same button again it will advance to interval 8 and then go into the timing speed to the off position at interval 21. It will be noted that one additional cycle selection switch has this feature.
  • the present invention constitutes an improvement over Thornbery et al. application Serial No. 799,781 insofar as the timer motor and the shaded pole motor use a common drive mechanism to step the timer.
  • the drive includes an improved stepping mechanism preventing overstepping as explained more fully above.
  • This invention also includes the sub-interval switching which, as explained above, greatly adds to the versatility of the machine. Heretofore, it was necessary to devote an entire interval to accomplishing a given function even though the function did not require the entire interval. By utilizing sub-interval switching, multiple functions can be performed within a given interval. A further feature is to be noted in connection with the sub-interval switching.
  • the sub-interval switching arrangement being essentially a creep type timer.
  • the customary interval timer a plurality of circuits are theoretically made simultaneously upon the timer being stepped.
  • an interval timer having a timer motor, a cam bank driven by the timer motor in a step-by-step manner with the cam bank operating interval switches according to a prescribed sequence, and a creep timer including a plurality of sub-interval switches sequenced once for each interval of the prescribed sequence, said sub-interval switches being connected in circuit with certain of the interval switches to modify circuits controlled by the interval switches in accordance with the operation of the sub-interval switches, and a 10 switch responsive to a desired water level in the washing machine, including a circuit connecting the timer motor and the water level switch, and a sub-interval switch operative to shunt the level switch and connect the timer motor to a circuit, said sub-interval switch being operative at a predetermined interval in the prescribed sequence to make energization of the timer motor dependent upon the level switch indicating the desired level in the machine.
  • a washing machine including a pump for draining the machine, a sub-intervalswitch connecting the pump to a circuit to empty the machine, the timer motor sub-interval switch and the pump subinterval switch both being closed during a portion of the time that the timer motor sub-interval switch is closed.
  • a washing machine including a water supply means, a sub-interval switch in circuit with the water supply means and the level switch whereby to effect filling the machine in said predetermined interval, the water supply means sub-interval switch being closed in the first portion of the interval, and the pump and motor sub-interval switches being closed in a later portion of the interval.
  • a washing machine according to claim 3 wherein one of said interval switches is in series with the pump sub-interval switch to control the intervals in which the pump sub-interval switch will be eifective.
  • An interval timer including a cam bank driven by a timer motor in a step-by-step manner with the cam bank operating interval switches according to a prescribed sequence, a creep timer including a plurality of sub-interval switches sequenced once for each interval of the interval timer, said sub-interval switches being con nected in circuit with certain of the interval switches to modify circuits controlled by the interval switches in accordance with the operation of the sub-interval switches, one of said sub-interval switches being connected in circuit with the timer motor, and a circuit in parallel with the timer motor sub-interval switch and including a water level switch responsive to a desired condition, whereby to shunt the sub-interval switch when the desired condition obtains.

Landscapes

  • Control Of Multiple Motors (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Measurement Of Predetermined Time Intervals (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Control Of Ac Motors In General (AREA)
  • Forging (AREA)
  • Motor And Converter Starters (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
US79978059 1959-03-16 1959-03-16 Timer Expired - Lifetime US2995143A (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
NL249476D NL249476A (fr) 1959-03-16
US79978059 US2995143A (en) 1959-03-16 1959-03-16 Timer
GB430062A GB949547A (en) 1959-03-16 1960-01-21 Improvements in and relating to timers
GB4102263A GB949551A (en) 1959-03-16 1960-01-21 Improvements in and relating to timers
GB430162A GB949548A (en) 1959-03-16 1960-01-21 Improvements in and relating to timers
GB3192763A GB949549A (en) 1959-03-16 1960-01-21 Improvements in and relating to devices for controlling the operations of washing machines
GB218260A GB949542A (en) 1959-03-16 1960-01-21 Improvements in or relating to timers
GB429962A GB949546A (en) 1959-03-16 1960-01-21 Improvements in and relating to washing machines
GB429862A GB949545A (en) 1959-03-16 1960-01-21 Improvements in and relating to timers
FR818127A FR1252261A (fr) 1959-03-16 1960-02-10 Minuterie à déclenchements successifs et programmes multiples
BE587629A BE587629A (fr) 1959-03-16 1960-02-15 Minuterie à déclenchements successifs et programmes multiples
DE19601413714 DE1413714A1 (de) 1959-03-16 1960-03-09 Zeitsteuervorrichtung
US3564279D US3564279A (en) 1959-03-16 1960-09-14 Timer
US27609D USRE27609E (en) 1959-03-16 1971-11-01 Sub interval

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US79978059 US2995143A (en) 1959-03-16 1959-03-16 Timer

Publications (1)

Publication Number Publication Date
US2995143A true US2995143A (en) 1961-08-08

Family

ID=25176726

Family Applications (1)

Application Number Title Priority Date Filing Date
US79978059 Expired - Lifetime US2995143A (en) 1959-03-16 1959-03-16 Timer

Country Status (5)

Country Link
US (1) US2995143A (fr)
BE (1) BE587629A (fr)
DE (1) DE1413714A1 (fr)
GB (7) GB949548A (fr)
NL (1) NL249476A (fr)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3150349A (en) * 1961-01-13 1964-09-22 Lab For Electronics Inc Traffic control system and controller
US3189697A (en) * 1960-05-10 1965-06-15 Holzer Walter Printed circuit timer with arcpreventing auxiliary contacts
US3193629A (en) * 1961-11-21 1965-07-06 Perkin Elmer Corp Digital lever switch with indicating means
US3206117A (en) * 1961-09-05 1965-09-14 American Radiator & Standard Motor-operated valve
US3217188A (en) * 1962-09-20 1965-11-09 Robertshaw Controls Co Automatic program selecting controller
US3220226A (en) * 1963-12-12 1965-11-30 Gen Electric Control circuits for automatic clothes washing machines
US3227821A (en) * 1962-04-06 1966-01-04 Hauser Fred Timing device with rotating cam operated micro-switch
US3267702A (en) * 1963-11-25 1966-08-23 Schulthess & Co Ag Maschf Programming control apparatus for automatic washing machines
US3269154A (en) * 1964-07-13 1966-08-30 Philco Corp Washing machines
US3285181A (en) * 1964-01-16 1966-11-15 Howard Electric Company Automatic pump alternator
US3296465A (en) * 1963-01-29 1967-01-03 Borg Warner Control arrangement for a household appliance
DE1239758B (de) * 1962-06-27 1967-05-03 Walter Holzer Drucktastenschalter mit mehreren nebeneinander angeordneten, federbelasteten Drucktasten
US3333121A (en) * 1964-06-01 1967-07-25 Maytag Co Automatic control device
US3403538A (en) * 1966-09-26 1968-10-01 Gen Motors Corp Automatic clothes washing apparatus with improved agitation control
US3730645A (en) * 1967-09-21 1973-05-01 F Mashakaru Air supplying device for an endoscope
US3886378A (en) * 1973-11-08 1975-05-27 Clemar Mfg Corp Timing unit for connecting power sequentially to a plurality of stations
US4042984A (en) * 1975-12-31 1977-08-23 American Bath And Shower Corporation Automatic bathtub water level control system
US4299597A (en) * 1979-02-19 1981-11-10 Gebruder Buhler Ag Process and filter control system for the cyclic counter-scavenging of diaphragm-activated filter hoses
US20090178576A1 (en) * 2008-01-15 2009-07-16 Valentine Richard D Self-cleaning rotisserie oven

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES204784Y (es) * 1974-07-19 1976-05-01 Ederlan, S. Coop. Disposicion perfeccionada de conmutadores de programas de lavadoras.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2302923A (en) * 1940-03-19 1942-11-24 Prosperity Co Inc Water level control for washing machines and the like
US2391718A (en) * 1942-12-12 1945-12-25 Gen Electric Washing machine
US2458683A (en) * 1943-01-07 1949-01-11 Bristol Company Sequence control
US2788850A (en) * 1952-08-19 1957-04-16 Ad Schulthess & Co A G Control for automatic washing machines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2302923A (en) * 1940-03-19 1942-11-24 Prosperity Co Inc Water level control for washing machines and the like
US2391718A (en) * 1942-12-12 1945-12-25 Gen Electric Washing machine
US2458683A (en) * 1943-01-07 1949-01-11 Bristol Company Sequence control
US2788850A (en) * 1952-08-19 1957-04-16 Ad Schulthess & Co A G Control for automatic washing machines

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3189697A (en) * 1960-05-10 1965-06-15 Holzer Walter Printed circuit timer with arcpreventing auxiliary contacts
US3150349A (en) * 1961-01-13 1964-09-22 Lab For Electronics Inc Traffic control system and controller
US3206117A (en) * 1961-09-05 1965-09-14 American Radiator & Standard Motor-operated valve
US3193629A (en) * 1961-11-21 1965-07-06 Perkin Elmer Corp Digital lever switch with indicating means
US3227821A (en) * 1962-04-06 1966-01-04 Hauser Fred Timing device with rotating cam operated micro-switch
DE1239758B (de) * 1962-06-27 1967-05-03 Walter Holzer Drucktastenschalter mit mehreren nebeneinander angeordneten, federbelasteten Drucktasten
US3217188A (en) * 1962-09-20 1965-11-09 Robertshaw Controls Co Automatic program selecting controller
US3296465A (en) * 1963-01-29 1967-01-03 Borg Warner Control arrangement for a household appliance
US3267702A (en) * 1963-11-25 1966-08-23 Schulthess & Co Ag Maschf Programming control apparatus for automatic washing machines
US3220226A (en) * 1963-12-12 1965-11-30 Gen Electric Control circuits for automatic clothes washing machines
US3285181A (en) * 1964-01-16 1966-11-15 Howard Electric Company Automatic pump alternator
US3333121A (en) * 1964-06-01 1967-07-25 Maytag Co Automatic control device
US3269154A (en) * 1964-07-13 1966-08-30 Philco Corp Washing machines
US3403538A (en) * 1966-09-26 1968-10-01 Gen Motors Corp Automatic clothes washing apparatus with improved agitation control
US3730645A (en) * 1967-09-21 1973-05-01 F Mashakaru Air supplying device for an endoscope
US3886378A (en) * 1973-11-08 1975-05-27 Clemar Mfg Corp Timing unit for connecting power sequentially to a plurality of stations
US4042984A (en) * 1975-12-31 1977-08-23 American Bath And Shower Corporation Automatic bathtub water level control system
US4299597A (en) * 1979-02-19 1981-11-10 Gebruder Buhler Ag Process and filter control system for the cyclic counter-scavenging of diaphragm-activated filter hoses
US20090178576A1 (en) * 2008-01-15 2009-07-16 Valentine Richard D Self-cleaning rotisserie oven
US8375848B2 (en) * 2008-01-15 2013-02-19 Premark Feg L.L.C. Self-cleaning rotisserie oven

Also Published As

Publication number Publication date
GB949546A (en) 1964-02-12
GB949542A (en) 1964-02-12
GB949545A (en) 1964-02-12
GB949547A (en) 1964-02-12
GB949549A (en) 1964-02-12
NL249476A (fr) 1900-01-01
BE587629A (fr) 1960-05-30
DE1413714A1 (de) 1968-12-05
GB949548A (en) 1964-02-12
GB949551A (en) 1964-02-12

Similar Documents

Publication Publication Date Title
US2995143A (en) Timer
US3464437A (en) Overflow protection device
US3650157A (en) Timer
US3003097A (en) Sequence control system for timing motor
US3112379A (en) Apparatus for the preselection of programmes in connection with fully automatic washing machines
US3033999A (en) Timer and timer positioning means
DE886621C (de) Automatische, elektrisch betriebene Waschmaschine
US3564279A (en) Timer
USRE27609E (en) Sub interval
US3125695A (en) Certificate of correction
US2612034A (en) Automatic washing machine with detergent injector
US2976471A (en) Control device
US2355455A (en) Washing machine
US2957329A (en) Control circuits for automatic clothes washing machines
US3171987A (en) Impulse device for the program control of washing machines
US3217188A (en) Automatic program selecting controller
US2964933A (en) Program timer
US3133433A (en) Automatic washing machine with pressure switch means
US3320442A (en) Circuitry for automatic appliances
US2376901A (en) Timing control
US3296465A (en) Control arrangement for a household appliance
US2176195A (en) Switch
US3269154A (en) Washing machines
US3465110A (en) Multiple time base timer
US3321588A (en) Automatic control means