US3548615A - Washing machine - Google Patents

Washing machine Download PDF

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Publication number
US3548615A
US3548615A US771919A US3548615DA US3548615A US 3548615 A US3548615 A US 3548615A US 771919 A US771919 A US 771919A US 3548615D A US3548615D A US 3548615DA US 3548615 A US3548615 A US 3548615A
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US
United States
Prior art keywords
drum
vibration
rotation
motor
clothing
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
US771919A
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English (en)
Inventor
Toshikazu Ohnishi
Hiroki Utsumi
Toru Tazawa
Sigeto Yamane
Katsumasa Matsuura
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 claimed from JP42069862A external-priority patent/JPS5016099B1/ja
Priority claimed from JP7199267A external-priority patent/JPS499506B1/ja
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Application granted granted Critical
Publication of US3548615A publication Critical patent/US3548615A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/16—Imbalance
    • 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
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/48—Preventing or reducing imbalance or noise
    • 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
    • D06F2103/26—Imbalance; Noise level

Definitions

  • a drum-type washing machine capable of performing programmed operations ranging from a clothing operation to a spinning operation automatically, wherein a motor for driving a drum is shifted from a low rate of speed to a high rate of speed under the control of vibration detecting means provided on the drum and the drum is accelerated to a higher rate upon detecting the fact that a clothing in the drum is distributed evenly with respect to the center of rotation of said drum, whereby an excessively large vibration of the drum is prevented.
  • This invention relates to a drum-type ywashing machine and more particularly to a drum-type washing machine which is so designed that the vibration of a clothing accommodating drum is minimized while the rotating speed of said drum is being accelerated and ⁇ after the rotating speed has been accelerated to the high speed rotation by changing over the rotating speed of said drum to high speed rotation when the amplitude of the drum vibration is within a tolerable range over a predetermined period of time.
  • a drum-type washing machine of the type which is provided with a drum rotating about a horizontal shaft or a shaft inclined at a predetermined langle with respect to a horizontal plane and which is operated by a process comprising placing a clothing in the drum, charging a cleaning liquid in said drum, rotating the drum at a low speed for rolling the clothing therein thereby washing said clothing and rotating the drum at a high speed lwith a drain valve opened to effect centrifugal spinning, the drum tends to undergo an excessively large vibration ⁇ while the rotating speed of said drum is being accelerated and after the rotating speed has been accelerated to the high speed rotation due to uneven distribution of the clothing in the drum.
  • the present invention has been achieved based on the discovery, through experiments, that the vibration of drum would be extremely small transition of the drum rotation to a high speed rotation could be attained smoothly ⁇ without generating an excessively large vibration when a clothing in the drum is distributed symmetrically evenly With respect to the center of rotation of the drum in the low speed rotation of the drum and the rotation of the drum is shifted from low speed rotation to high speed rotation under such condition.
  • An object of the present invention is to prevent an excessively large vibration occurring while the rotating speed of said drum is being accelerated and after the rotating speed has lbeen accelerated to the high speed rotation.
  • Another object of the invention is to provide highly sensitive detecting means for detecting the timing of shifting the drum from low speed rotation to high speed rotation.
  • Still another object of the invention is to provide a washing machine which is so constructed that an excessively large vibration sporadically occurring during acceleration of the drum from low speed rotation to high speed rotation can be damped effectively.
  • Still another object of the invention is to provide detecting means for detecting the timing of transition from low speed rotation to high speed rotation at low costs.
  • FIG. 1 is a front elevation of a drum-type washing machine according to the present invention, with a front panel broken away to show a mechanism interior of the machine;
  • FIG. 2 is a vertical sectional view of the washing machine
  • FIG. 3 is a wiring diagram of the drum-type washing machine
  • FIG. 4 is a diagram illustrating the operation program of the drum-type washing machine
  • FIG. 5 is a detailed view of vibration detecting means
  • FIG. 6 is a wiring diagram of the control circuit used in the drum-type lwashing machine
  • FIG. 7a is a detailed view of another form of the vibration detecting means.
  • FIG. 7b is a fragment-ary enlarged view of the vibration detecting means shown in FIG. 7a;
  • FIG. 8 is a wiring diagram of another form of the control circuit
  • FIG. 9 is a diagram showing a vibration wave form of the drum.
  • FIG. 10 is a vibration characteristic chart.
  • a lbox-shaped outer frame 1 has stays 2 provided across the upper portions of the inner surface of the side walls thereof and each stay 2 has seimspherical indents 3 formed therein at two places.
  • a piece 5 which has a semispherical convexed surface and is connected to a bolt 4.
  • the bolt 4 extends downwardly through the stay 2, with a spring seat 6 threadably mounted on the lower end portion thereof.
  • a suspension coil spring 7 has the upper end thereof fitted on the spring seat 6 and the lower end thereof anchored to the side wall of a cylindrical outer tank 8, thereby suspending said outer tank.
  • a bearing cylinder 9 which is extending through an end wall member 10 and secured to the outer tank 8.
  • the bearing cylinder 9 has ball bearings 11 disposed therein through which a drum shaft 12 is journaled.
  • a washing accommodating drum 14 is fixedly connected to the inner end of the drum shaft 12 through a liange member 13, while a pulley 16 is fixedly mounted on the outer end of the drum shaft by means of a key 15.
  • the drum 14 has a number of apertures 17 perforated through the peripheral wall thereof for the passage of Water therethrough in the process of spinning.
  • the drum 14 also has a plurality of inwardly projecting baffles 18 secured to the inner wall surface thereof by bolts 19 extending axially across the drum.
  • the front end face of the outer tank 8 is covered with a front cover 20 which is secured to the outer tank through a packing 21 and said front cover 20 has an opening in the central portion thereof for throwing a clothing therethrough.
  • the peripheral edge of the opening is connected to the peripheral edge 23 of a clothing inlet opening 24, formed in the front wall of the outer frame 1, by means of a flexible rubber bellows 22.
  • the clothing inlet opening 24 is closed by a door 25 made of a transparent plastics.
  • Arms 26 and 27 are connected to the bottom of the outer tank 8 by welding and motors 28 and 29 are fixed to the lower ends of the respective arms.
  • the driving shaft 30 of the motor 29 has a large pulley 32 loosely mounted thereon through a spring clutch 31 and said large pulley 32 is in turn operatively connected to a small pulley of the other motor 28 through a V-belt (not shown)
  • the driving shaft 30 also has a small pulley 33 keyed thereon and a V-belt 34 is engaged around said small pulley 33 and the aforesaid pulley 16 fxedly mounted on the drum shaft 12.
  • the motor 28 is operatively connected to a pump 35 to drive the same, said pump 35 being connected to the bottom of the outer tank.
  • the pump 35 is driven from the motor 28 during the process of washing operation to circulate a washing water retained in the outer tank 8.
  • friction plates 37 and 38 Extending slantingly downwardly from the outer tank 8 are friction plates 37 and 38. These friction plates are each clamped between front and rear friction members 40, 41 and damp a vibration of the outer tank 8 in engagement with said friction members.
  • the friction members 40, 41 are supported by respective supporting springs 39 fixed to the outer frame.
  • a filling fiange 42 for connection to an external faucet and a filling solenoid valve 43 in communication with said filling fiange.
  • the outlet of the filling solenoid valve 43 is communicated with the upper portion of the outer tank 8 through a filling tube 44.
  • the filling solenoid valve 43 is operated under the control of a pressure switch 45 which is actuated by the water level in the outer tank 8 and is communicated with the bottom portion of the outer tank through a pipe 46.
  • Reference numeral 47 designates a timer which is so designed that once it has been set at a starting position, a programmed Operaation is carried out automatically by the action of a timer motor, accommodated therein, in accordance with a timer cycle chart to be described later. The operation is started by manually operating a knob 48.
  • Reference numeral 49 designates a vibration detector fitted to a portion of the stay 2 and the detailed structure of said vibration detector is shown in FIG. 5.
  • Reference numeral 50 designates a box in which is housed means for controlling the rate of rotation of the drum in response to a signal from the vibration detector 49. The detailed wiring of the control means 50 is shown in FIG. 6.
  • the vibration detector 49 comprises a vibration transmitting rod 52 connected integrally with the piece 5 having a semispherical convexed surface.
  • the vibration transmitting rod 52 has connected to the lower end thereof an electrode box 53.
  • a movable contact 55 which is normally held centrally of the box under the biasing forces of return springs 54.
  • Fixed contacts 56 are provided on the outer frame side at locations opposite to the opposite ends of the movable contact 5S respectively with a distance S therebetween.
  • the movable contact 55 and the fixed contacts 56 are electrically connected with the control means by lead wires 57, 58 as shown in FIG. 6.
  • a voltage from a commercial power source is dropped by a transformer 60, rectified and smoothened by a diode 61 and a condenser 62, and impressed across the movable contact and the fixed contacts through resistors 63, 67 and 68.
  • a condenser 64 is connected in parallel to both contacts, so that a charging voltage of said condenser 64 is supplied to the base of a transistor 65 through a resistor 69.
  • the base potential of a transistor 66 rises due to a voltage drop of a resistor 70, whereby said transistor 66 is energized and accordingly the exciting coil of a relay 72 is excited.
  • the exciting coil serves as a pole changer for the motor 28 shown in the circuit diagram of FIG. 3.
  • a cam switch 73 is closed under the control of a timer motor 74 only when the program enters the spinning process.
  • reference numerals 73, 81, 82, 83, 84, 85, 86 and 87 designate cam switches controlled by a series of cams provided on the shaft of a timer motor 89, and the configurations of the cams of the respective cam switches are so selected that they will contact the lateral thick lines in the program chart of FIG. 4 respectively.
  • a door switch 91 which is adapted to be closed only when the door 25 is closed, the cam switch 81 and a manual switch 92 are connected in series with a power source 90. Therefore, when the timer knob is set at the starting position, the cam switch 81 is closed first and a pilot lamp 93 is lighted indicating that the washing machine has been placed in operation.
  • the pressure switch is in NC position and the cam switch 83 in a position. Therefore, the filling solenoid valve 43 is energized to start filling.
  • the pressure switch 45 is switched to NO position and the pole change motor 28 is actuated through a selective switch 94 and a reversing switch 95, since the cam switch 86 is in a position.
  • the selective switch 94 is provided for the purpose of shifting the washing operation from strong washing operation to mild washing operation or vice versa and is operated manually.
  • the reversing switch 95 and another reversing switch 96 are provided to change the proportion of the period of normal rotation to the period of reverse rotation of the motor 28.
  • the motor 28 rotates in the normal direction and in the reverse direction repeatedly in a predetermined cycle, causing the drum 14 to rotate in the normal direction or in the reverse direction, whereby the clothing in the drum is rolled therein and thus washed.
  • the timer motor 89 rotates to carry out the'program, since the cam switch 87 is held in a closed pos1t1on.
  • the cam switch 82 Upon completion of the washing process, the cam switch 82 is closed, and the cam switch '83 is brought into b position and the cam switch 84 into b position, so that a drain valve 75 is opened to drain the washing water and at the same time a microswitch 76 is closed which is operatively associated with said drain valve 75.
  • the cam switch 83 Upon completion of the drain, the cam switch 83 is brought into a position to actuate the filling solenoid valve 43 and thus filling is commenced.
  • the pressure switch 45 When the water in the outer tank 8 has reached the prescribed level, the pressure switch 45 is shifted from NC position to NO position, whereby filling is interrupted.
  • the timer motor 89 and the motor 28 continue to rotate in the period from the drain process to the filling process and therefore the drum 14 rotates continuously at the same speed as in the washing process.
  • the washing machine Upon completion of a rinsing operation for a predetermined period, the washing machine enters the spinning process.
  • the cam switch 73 is closed and the cam switch 87 is opened, so that the timer motor 89 is stopped and a voltage is impressed on the vibration detecting circuit shown in FIG. 6.
  • the cam switch 186 is brought into b position, so that the motor 28 starts to rotate in one direction at the same speed as in the washing process.
  • the distribution becomes extremely uniform particularly when a relatively large quantity of clothing is placed in the drum, because the clothing is distributed along the peripheral wall of the drum in an annular shape.
  • the present invention is characterized in that whether the clothing in the drum is uniform distribution or not is acknowledged by detecting the amplitude at which the outer tank is vibrating, so that acceleration of the drum may be effected when the distribution of the clothing is uniform.
  • the movable contact 55 is connected to the outer tank suspending bolt 4 through the vibration transmitting rod 52 and the fixed contacts 56 are arranged in opposed relation to said movable contact. Between the movable and fixed contacts is provided a spacing S.
  • the vibration detector of the arrangement described when the drum 4 vibrates with a vibration wave form as shown in FIG. 9 and if the amplitude of the vibration exceeds a predetermined value, the movable contact 55 is brought into Contact with the fixed 6 contact 56 and performs an ON-OFF operation in the same cycle as the cycle in which the drum vibrates.
  • the condenser 64 provided in parallel to the movable and fixed contacts, discharges the electric charge stored therein through said movable and fixed contacts, the base potential of the transistor 65 does not rise to a level to energize said transistor, so that the transistor 65 remains deenergized and the relay is held inoperative with no current owing through the exciting coil thereof.
  • the drum vibrates at a small amplitude and therefore the movable contact and the fixed contact 56 of the vibration detector are held disengaged over a certain period of time.
  • the voltage of the condenser reaches a level to energize the transistor 65 and thus the transistor 65 is energized.
  • a current flow through the exciting coil 72 of the relay through the following transistor 66, and a contact 79 and a contact 78 provided in series with the timer motor 89 are actuated, whereby the pole of the motor 28 is changed to drive the drum 14 at Va rate twice as high as that in the washing process.
  • the timer motor 89 is actuated again to control the cam switches.
  • the cam switch Upon passage of a predetermined time after the pole of the motor 28 is changed, the cam switch is brought into b position, so that the motor 29 is set in motion, and at the same time the cam switch 87 is closed and the cam switch 73 is opened.
  • the contacts 78 and 79 of the relay are returned to the position shown and the ⁇ motor 28 is shifted to low speed rotation.
  • the vibration of the mass system suspended by the springs is composed of a component in a vertical plane and a component in a horizontal plane, and the natural frequency thereof is generally higher in the vertical plane than in the horizontal plane. This is because, while the natural frequency of the vibration in a horizontal direction is determined by the distance from the semispherical concaved surface 3 to the center of gravity of the resiliently supported moving part, that of the vibration in a vertical direction is determined by the mass of the resiliently suspended moving part and the spring constant of the four suspension springs.
  • the springs are naturally required to be large in spring constant or large in rigidity because they must support the mass system. In practice, the vibration has a characteristic as shown in FIG. 10.
  • the cycle of vibration of the drum substantially coincides with the cycle of rotation of the drum. Therefore, it will be understood that a great vibration preventing effect will be attained by setting the rotating speed of the drum such that the aforesaid period wherein the frequency of the drum coincides with the natural frequency thereof in a horizontal and in a veltical direction, may be minimized.
  • the vibration of the drum can be effective by setting the rotating speed of the drum such that f1, f2 and f3 may not coincide with fnh and fm, as shown.
  • the frequency of the drum will pass the points of these natural frequencies instantaneously during the process of acceleration and move up to a higher level before the amplitude of the drum becomes large.
  • the present invention will be further described with reference to another embodiment thereof.
  • it is essential to detect the amplitudes of the drum 14 and the outer tank 8 as accurately as possible.
  • the detector is required to be accurate in operation, long in service life and low in cost.
  • pressing member 99 is disposed for engagement with the bolt 4 through a lever 98 and a piezo element 100 is interposed between the pressing member 99 and the stay 2.
  • a lead wire 101 of the piezo element is led into the control box 50 and connected with the control circuit therein.
  • the control circuit in this case, is arranged as shown in FIG. 8 and operative in such a manner that the electric signal from the piezo element is amplified for comparison with a reference value and when the former is greater than the latter, that is, when the frequency of the drum is greater than a tolerance, the relay is held inoperative, whereas when the former is Smaller than the latter, the relay 72 is actuated, thereby accelerating the drum.
  • filling takes place for rinsing. If, in this case, a water level selecting switch 102 is in a closed position, the filling goes on superfiuosly just for that period when the cam switch 84 is held in a position, even if the pressure switch 45 is switched from NC position to NO position, and accordingly, rinsing is effected with a larger amount of water than in the washing process,
  • the drum is driven from the motor 29 at the final high speed, so that a strong centrifugal spinning can be attained.
  • the speed of rotation of the drum may be changed by varying the transmission gear ratio of a speed change gear, such as a variable pulley, in addition to changing the poles of the motor.
  • a washing machine comprising means for detecting a vibration of a clothing accommodating drum and for driving said drum at a relatively low speed rotation and a relatively high speed rotation, whereby the rotating speed of said drum is shifted to the high speed rotation when the amplitude of vibration of the drum during rotation at the low speed is held not greater than a tolerable value over a predetermined period.
  • a washing machine as defined in claim l wherein there is provided means for driving the clothing accommodating drum at at least two different speeds of rotation and the natural frequencies of resiliently supported parts, including said drum, are located between said speeds of rotation.
  • a washing macltine comprising means for driving a clothing accommodating drum at three or more different speeds of rotation, and three different speeds of rotation being located at points outside the natural frequencies of resiliently supported parts including said drum, the speed of rotation of said drum being shifted from the lowest speed to the next higher speed only when the amplitude of said drum is held not greater than a tolerable value over a predetermined period and the subsequent shifting of the speed of rotation and said drum to higher speeds being effected automatically.
  • a washing machine comprising means for detecting a vibration of such parts as a drum and an outer tank resiliently suspended from an outer frame through suspension springs in the form of displacement of a vibration transmitting rod connected to said suspension spring at the joint between said suspension spring and said outer frame and means for controlling the speed of rotation of said drum in response to a signal from an electric contact mechanically operated by the displacement of said vibration transmitting rod.
  • a washing machine comprising a piezo element adapted to detect a change in a tension developed in a suspension spring in accordance with a vibration of a drum and means for shifting the speed of rotation of said drum from a low speed rotation to a higher speed rotation when the output of said piezo element becomes lower than a set value.
  • a washing machine comprising means for driving a drurn at at least two different speeds rotation consisting of a low speed rotation and a high speed rotation, means for detecting a vibration of said drum during the low speed rotation of the drum and in the process of acceleration of the drum from the low speed rotation to the high speed rotation, and means for accelerating the drum to the high speed rotation when the vibration of the drum detected by said vibration detecting means is below a tolerable value and returning the drum to the 10W speed rotation again when the amplitude of vibration of the drum becomes excessively large in the process of acceleration.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
US771919A 1967-11-01 1968-10-30 Washing machine Expired - Lifetime US3548615A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP42069862A JPS5016099B1 (zh) 1967-11-01 1967-11-01
JP7199267A JPS499506B1 (zh) 1967-11-10 1967-11-10

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US3548615A true US3548615A (en) 1970-12-22

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US771919A Expired - Lifetime US3548615A (en) 1967-11-01 1968-10-30 Washing machine

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DE (1) DE1806428A1 (zh)
FR (1) FR1590374A (zh)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939674A (en) * 1973-01-23 1976-02-24 Whirlpool Corporation Suspension mounting assembly for automatic washers
US4411664A (en) * 1982-04-30 1983-10-25 General Electric Company Washing machine with out-of-balance detection and correction capability
US5839297A (en) * 1997-06-11 1998-11-24 White Consolidated Industries, Inc. Out of balance sensor and control method for a textile processing machine
US20040050117A1 (en) * 2000-10-27 2004-03-18 Bsh Bosch Und Siemens Hausgerate Gmbh Porthole door for a front-loading drum washing machine
US20040103698A1 (en) * 2002-11-28 2004-06-03 Lg Electronics Inc. Drum assembly of washing machine
US20060053838A1 (en) * 2004-09-13 2006-03-16 Matsushita Electric Industrial Co., Ltd. Drum type washing machine
US20060218974A1 (en) * 2005-04-01 2006-10-05 Askoll Holding S.R.I. Improved Washing-Machine and Similar Household Appliances with Rotary Drum
USRE40732E1 (en) * 2000-04-04 2009-06-16 Lg Electronics Inc. Method for controlling washing during spinning in tilt-type washing machine for attenuation of vibration
US9534334B2 (en) * 2014-09-22 2017-01-03 Whirlpool Corporation Laundry treating appliance with a suspension assembly and a suspension assembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2204325C2 (de) * 1972-01-26 1984-05-30 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Zum Schleudern dienende Trommelwaschmaschine
FR2656777B1 (fr) * 1990-01-05 1992-06-12 Graire Stanislas Semelle de protection amortissante pour chaussure et chaussure comportant une telle semelle.

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2296261A (en) * 1939-11-07 1942-09-22 Westinghouse Electric & Mfg Co Laundry apparatus
US2832208A (en) * 1955-08-03 1958-04-29 Gen Electric Adjustable vibration sensing means for laundry machine
US3114705A (en) * 1962-08-20 1963-12-17 Gen Motors Corp Means for controlling the dampening of an elastically suspended rotating drum duringcentrifuging
US3268791A (en) * 1963-12-26 1966-08-23 Gen Motors Corp Centrifugal extraction machine having speed control means responsive to vibration
US3273361A (en) * 1963-09-19 1966-09-20 Gen Motors Corp Clothes washer machine with a programmed rebalancing cycle
US3283547A (en) * 1964-03-02 1966-11-08 Whirlpool Co Speed control for a laundry machine
US3311237A (en) * 1966-05-31 1967-03-28 Maytag Co Fluid extractor speed control

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2296261A (en) * 1939-11-07 1942-09-22 Westinghouse Electric & Mfg Co Laundry apparatus
US2832208A (en) * 1955-08-03 1958-04-29 Gen Electric Adjustable vibration sensing means for laundry machine
US3114705A (en) * 1962-08-20 1963-12-17 Gen Motors Corp Means for controlling the dampening of an elastically suspended rotating drum duringcentrifuging
US3273361A (en) * 1963-09-19 1966-09-20 Gen Motors Corp Clothes washer machine with a programmed rebalancing cycle
US3268791A (en) * 1963-12-26 1966-08-23 Gen Motors Corp Centrifugal extraction machine having speed control means responsive to vibration
US3283547A (en) * 1964-03-02 1966-11-08 Whirlpool Co Speed control for a laundry machine
US3311237A (en) * 1966-05-31 1967-03-28 Maytag Co Fluid extractor speed control

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939674A (en) * 1973-01-23 1976-02-24 Whirlpool Corporation Suspension mounting assembly for automatic washers
US4411664A (en) * 1982-04-30 1983-10-25 General Electric Company Washing machine with out-of-balance detection and correction capability
US5839297A (en) * 1997-06-11 1998-11-24 White Consolidated Industries, Inc. Out of balance sensor and control method for a textile processing machine
US5906020A (en) * 1997-06-11 1999-05-25 White Consolidated Industries, Inc. Out of balance sensor and control method for a textile processing machine
USRE40732E1 (en) * 2000-04-04 2009-06-16 Lg Electronics Inc. Method for controlling washing during spinning in tilt-type washing machine for attenuation of vibration
US7299666B2 (en) * 2000-10-27 2007-11-27 Bsh Bosch Und Siemens Hausgeraete Gmbh Porthole door for a front-loading drum washing machine
US20040050117A1 (en) * 2000-10-27 2004-03-18 Bsh Bosch Und Siemens Hausgerate Gmbh Porthole door for a front-loading drum washing machine
US20040103698A1 (en) * 2002-11-28 2004-06-03 Lg Electronics Inc. Drum assembly of washing machine
US20060053838A1 (en) * 2004-09-13 2006-03-16 Matsushita Electric Industrial Co., Ltd. Drum type washing machine
US7530244B2 (en) * 2004-09-13 2009-05-12 Matsushita Electric Industrial Co., Ltd. Drum type washing machine
US20060218974A1 (en) * 2005-04-01 2006-10-05 Askoll Holding S.R.I. Improved Washing-Machine and Similar Household Appliances with Rotary Drum
US7621157B2 (en) * 2005-04-01 2009-11-24 Askoll Holding S.R.L. Washing-machine and similar household appliances with rotary drum
US9534334B2 (en) * 2014-09-22 2017-01-03 Whirlpool Corporation Laundry treating appliance with a suspension assembly and a suspension assembly

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Publication number Publication date
DE1806428A1 (de) 1969-06-04
FR1590374A (zh) 1970-04-13

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