GB2236332A - Clothes washing machine - Google Patents
Clothes washing machine Download PDFInfo
- Publication number
- GB2236332A GB2236332A GB9015894A GB9015894A GB2236332A GB 2236332 A GB2236332 A GB 2236332A GB 9015894 A GB9015894 A GB 9015894A GB 9015894 A GB9015894 A GB 9015894A GB 2236332 A GB2236332 A GB 2236332A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pressure sensor
- semiconductor pressure
- air
- casing
- washing machine
- 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.)
- Granted
Links
Classifications
-
- 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
- D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00
- D06F39/08—Liquid supply or discharge arrangements
- D06F39/087—Water level measuring or regulating devices
-
- 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
- D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
- D06F33/34—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of water filling
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/14—Housings
- G01L19/147—Details about the mounting of the sensor to support or covering means
-
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Washing Machine And Dryer (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
Abstract
A clothes washing machine includes a tub (5), an agitator (7) agitating the wash water contained in the tub, an electric motor (8) driving the agitator (7), an air trap (12) mounted so as to communicate to the interior of the water receiving tub (5) such that the air pressure in the air trap (12) is increased in accordance with increase in the water level in the tub (5), a semiconductor pressure sensor (14) having an air inlet (17) communicating to the air trap (12) through an air tube (13), thereby generating an electrical signal the magnitude of which depends upon the pressure of air received in the air inlet (17) thereof, and an electronic circuit unit (4) including an amplifier (20) amplifying the output signal of the sensor (14) and a control circuit (19) controlling the motor (8). The electronic circuit unit (4) is formed on the same circuit board (18) as the sensor (14). The sensor comprises a silicon diaphragm (16) upon which a piezoresistance layer 16a is formed by impurity diffusion. <IMAGE>
Description
CLOTHES WASHING MACHINE
This invention relates to a clothes washing machine which comprises a water receiving tub for containing clothes to be washed together with water and an agitator provided within the water receiving tub for agitating-the water, and more particularly to such a clothes washing machine further provided with water level detecting means for detecting an amount of water supplied to the water receiving tub, based on the water level.
In the clothes washing machines of the above-described type, an upper open end of an outer cabinet enclosing the water receiving tub is usually closed by a flat box-shaped top cover. The top cover has an opening opposite to an upper open end of the water receiving tub so that the clothes are put into and taken out of the water receiving tub. The water level detecting means comprises an air trap provided on the lower portion of the water receiving tub and a water level detector disposed in the rear portion of the top cover. An air tube is provided for communicating between the air trap and water level detector. The water level detector is operated based on the air pressure in the air trap in accordance with the water level in the water receiving tub, thereby detecting the water level in the water receiving tub.An electronic circuit unit including a microcomputer for controlling the washing operation is provided in the inner front of the top cover.
The water level detector employed is of a reactance type which comprises a cavil and moving core and ensures the linear detection. In the inductance type water level detector, the core is moved relative to the coil by a diaphragm which is activated in accordance with the air pressure in the air trap, thereby changing the inductance of the coil. The water level in the water receiving tub is detected based on the value of the coil inductance.
In the above-described conventional structure, the arrangement of the coil and core increases the size of the water level detector. Consequently, since the water level detector necessitates a large mounting space in view of its large size, it is usually enclosed in the rear interior of the box-shaped top cover which provides a relatively large space. On the other hand, since the electronic circuit unit is enclosed in the front interior of the top cover in consideration of its operability, a signal wiring is provided between the water level detector and electronic circuit unit relatively away therefrom for processing output signals generated by the water level detector.
In the above-described arrangement, however, the signal wiring is likely to be overlaid by a noise, which ill affects accurate detection of the water level. Furthermore, since the electrical components are dispersively disposed in the front and rear interior of the top cover, an electric device cannot be compacted. Additionally, the electronic circuit unit has its own circuit board. The water level detector is provided, together with its peripheral electrical parts, on a circuit board different from that of the electronic circuit unit. Thus, a large number of parts are used and therefore, a large number of assembling steps are necessitated.
Therefore, an object of the present invention is to provide an improved clothes washing machine wherein an output signal line of the water level sensor can be prevented from being overlaid by the noise.
Another object of the invention is to provide an improved clothes washing machine wherein a compact arrangement of the electric device can be ensured and the number of assembling steps can be reduced.
The present invention provides a clothes washing machine comprising a water receiving tub for containing wash water, an agitating member for agitating the wash water contained in said water receiving tub, a motor for driving said agitating member, an air trap provided so as to communicate to the interior of said water receiving tub such that the pressure of air contained in said air trap is increased in accordance with increase in the water level in said water receiving tub, a semiconductor pressure sensor having an air inlet communicating to said air trap through air path forming means, thereby generating an electrical signal the magnitude of which depends upon the pressure of the air received in the air inlet thereof, and an electronic circuit unit comprising an amplification circuit amplifying the output signal of said semiconductor pressure sensor and a control circuit controlling said motor, said electronic circuit unit being formed on one and the same circuit board together with said semiconductor pressure sensor.
Since the water level detecting means comprises the semiconductor pressure sensor which is relatively smaller in size than the water level detector of the inductance type, the water level detecting means may be provided on one and the same circuit board together with the microcomputer serving as the control circuit. Furthermore, since the semiconductor pressure sensor as the water level detecting means, the amplifier processing the output signals from the semiconductor pressure sensor and the microcomputer are provided on one and the same circuit board so as to form an electronic circuit unit, the arrangement of the electric device may be compacted. Additionally, since the signal line between the semiconductor pressure sensor and electronic circuit unit is exceedingly short, the noise affection may be reduced.
It is preferable that the clothes washing machine further comprise a casing enclosing the circuit board, said casing having one side wall recessed so as to be projected inward, said casing having a support projection formed away from an inwardly projected portion so that a part of said semiconductor pressure sensor is placed between the inwardly projected portion of said casing and the support projection and one side of said semiconductor pressure sensor strikes against the inwardly projected portion of said casing.
The above-described structure of the casing prevents the pressure sensor from wobbling on the circuit board and being damaged while the air path means such as an air tube is pulled from and inserted into the air inlet of the pressure sensor in the repair.
It is also preferable that the clothes washing machine further comprise a casing enclosing the circuit board, said casing having one side wall having an opening through which the air path means is disposed and wherein said semiconductor pressure sensor be positioned in the vicinity of one end of said circuit board so that the side of said semiconductor pressure sensor having the air inlet is opposite to the side wall of said casing in which side wall the opening is formed.
It is further preferable that said semiconductor pressure sensor comprise a semiconductive material having a piezoresistance effect that an internal electric resistance is varied in accordance with pressure applied thereto.
It is further preferable that said semiconductor pressure sensor rest on said circuit board with the bottom thereof in contact with said circuit board and the width of the bottom of said semiconductor pressure sensor be larger than those of the other portions thereof.
The invention will be described, merely by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a longitudinal sectional view of a clothes washing machine in accordance with a first embodiment of the present invention;
FIG. 2 is a top plan view of the clothes washing machine;
FIG. 3 is a broken-out side view of an electronic circuit unit provided in the clothes washing machine;
FIG. 4 is a broken-out top plan view of the electronic circuit unit;
FIG. 5 is an enlarged longitudinal section of a semiconductor pressure sensor provided in the washing machine;
FIG. 6 is a longitudinal sectional view of an electronic circuit unit employed in the washing machine of a second embodiment;
FIG. 7 is a partially perspective view of the electronic circuit unit shown in FIG. 6;
FIG. 8 is a plan view of the electronic circuit unit with the casing broken out;;
FIG. 9 is a view similar to FIG. 6 showing the electronic circuit unit employed in the clothes washing machine of a third embodiment; and
FIG. 10 is a view similar to FIG. 6 showing the electronic circuit unit employed in the clothes washing machine of a fourth embodiment.
An embodiment of the present invention will be described with reference to FIGS. 1 to 5 of the drawings.
Referring first to FIG. 1, an automatic clothes washing machine has an outer cabinet 1 in which a water receiving tub 5 is disposed with a rotating tub 6 rotatably mounted therein. The invention may also be applied to the washing machine of the type wherein only the tub 6 is provided and the tub 6 serves as the tub 5. A generally container-shaped agitator 7 is rotatably mounted in the rotating tub 6. An electric motor 8 and transmission mechanism 9 are disposed on the underside of the water receiving tub 5 for driving the agitator 7 and rotating tub 6. As well known in the art, the water receiving tub 5 is provided with a drain hole 10 and a drain valve 11. A generally flat box-shaped top cover 2 is mounted on the upper open end of the outer cabinet 1. The top cover 2 has an access opening 2a for loading and unloading of clothes.A twofold lid 2d comprising two portions 2b and 2c is hingedly mounted on the top cover 2 for closing the access opening 2a. An operation panel section 3 is mounted on the front portion of the top cover 2 and an electronic circuit unit 4 including a circuit board on which electronic parts and the like are mounted is provided in the operation panel section 3. An air trap 12 constituting water level detecting means which will be described later is integrally formed on the bottom of the water receiving tub 5. The lower end of the air trap 12 communicates to the interior of the water receiving tub 5 and the upper portion thereof communicates to the lower end of an air tube 13 serving as air path forming means.The other end of the air tube 13 is extended to the electronic circuit unit 4 to be connected to a semiconductor pressure sensor which will be described hereinafter, as shown in
FIGS. 1 and 2.
Referring to FIGS. 3 and 4, the semiconductor pressure sensor 14 constituting the water level detecting means comprises a silicon pressure sensor, for example. The semiconductor pressure sensor 14 is constructed as shown in
FIG. 5 and more specifically, reference numeral 15 designates an enclosure in which a pressure sensitive portion 16 is provided by forming a diffused resistor layer having the piezoresistance effect on a thin silicon diaphragm 16a by means of impurity diffusion. An air inlet or pressure introducing aperture 17 is integrally formed in one side of the enclosure 15. The upper end of the air tube 13 is connected to the pressure introducing aperture 17.In the semiconductor pressure sensor 14 thus constructed, the resistance of the pressure sensitive portion 16 is varied when the diaphragm 16a is deformed subjected to air pressure introduced through the air tube 13, thereby measuring an amount of water in the water receiving tub 5 or detecting the water level therein. The semiconductor pressure sensor 14 has no mechanically operated parts and accordingly, is small in size. Consequently, the semiconductor pressure sensor 14 may be mounted on the circuit board in the electronic circuit unit 4, as will be described later.
Referring to FIGS. 3 and 4, the circuit board 18 on which the electronic circuit unit 4 is arranged is enclosed in a casing 4a having an opening 4b through which the air tube 13 is extended. On the circuit board 18 are mounted various electronic parts such as a microcomputer 19 for controlling the washing operation. Furthermore, the semiconductor pressure sensor 14, an amplifier 20 and analog-to-digital (A/D) converter 21 for processing the output signals of the semiconductor pressure -sensor 14.
In accordance with the above-described embodiment, the water level detecting means comprises the semiconductor pressure sensor 14 which is far smaller in size than the inductance type water level detector. As a result, the semiconductor pressure sensor 14 and microcomputer 19 may be mounted on one and the same circuit board 18. Furthermore, since the semiconductor pressure sensor 14, the amplifier 20 and AID converter 21 for processing the output signals of the sensor 14, and the microcomputer 19 may be mounted on the circuit board 18, the electric device may be compacted and the number of assembling steps may be reduced.
Additionally, since the signal wiring between the semiconductor pressure sensor 14 and the electronic circuit unit 4 including the amplifier 20 and AID converter 21 is rendered short, ill affection of noise for the signal wiring may be reduced. Consequently, the accuracy of the water level detection may be prevented from being reduced by the noise.
Furthermore, since the air inlet 17 of the semiconductor pressure sensor 14 is positioned at the side of one end of the circuit board 18 so as to be opposite to the aperture 4b of the casing 4a; the air tube 13 may be connected to and disconnected from the semiconductor pressure sensor 14 from the outside of the casing 4a, thereby improving the working efficiency.
A second embodiment of the invention will now be described with reference to FIGS. 6 to 8. The electronic circuit unit 4 is comprised of a case 31 and the circuit board 18 enclosed in the case 31. The case 31 comprises a base 31a and bottom plate 31b. On the circuit board 18 are mounted various electronic parts such as the microcomputer 19 for controlling the washing operation.
The semiconductor pressure sensor 14 is positioned at the side of one end of the circuit board 18 of the electronic circuit unit 4 and terminals 14a (one of them being shown in FIG. 6) thereof are connected to the circuit board 18 by way of soldering. As a result, the semiconductor pressure sensor 14 rests on the circuit board 18 upright relative to the same.
The base 31a of the case 31 has in one side wall thereof a recessed wall portion recessed inwardly of the side wall or inwardly projected wall portion 32. An opening 32a is formed in the inwardly projected wall portion 32 and the air tube 13 is inserted through the opening 32a. A risen strip portion or support projection 33 is integrally formed on the upper plate inner surface of the base 31a with a predetermined space between it and the inwardly projected wall portion 32. A sensor support 34 is thus comprised of the support projection 33 and inwardly projected wall portion 32 of the case 31. The upper portion of the semiconductor pressure sensor 14 is fitted in the space of the sensor support 34 between the support projection 33 and inwardly projected wall portion 32 such that the sensor 14 is supported by the sensor support 34 in position.
In accordance with the second embodiment, the upper portion of the semiconductor pressure sensor 14 is supported by the sensor support 34 provided on the case 31 of the electronic circuit unit 4 in the state that the semiconductor pressure sensor 14 is mounted on the circuit board 18. Consequently, the semiconductor pressure sensor 14 may be prevented from falling down forward or rearward when the air tube 13 is connected to or disconnected from the sensor. Thus, the air tube 13 may be connected to and disconnected from the sensor without any difficulty.
Particularly, in the embodiment, the sensor support 34 is integral with the base 31a of the case 31. Accordingly, an exclusive part for supporting the sensor 14 is not needed, thereby preventing the increase in the number of parts.
FIG. 9 illustrates a third embodiment of the invention.
The construction of the semiconductor pressure sensor 41 differs from that of the sensor 14 in the first embodiment.
More specifically, the lower portion of the enclosure 42 of the semiconductor pressure sensor 41 is extended rearward such that the sensor 41 has a generally L-shaped side configuration. The width of the bottom of the sensor 41 which rests on the circuit board 18 is increased, which makes it difficult for the sensor to fall down rearward. As a result, the semiconductor pressure sensor 41 may be prevented from falling down with more certainty.
Fig. 10 illustrates a fourth embodiment. In the fourth embodiment, the construction of the semiconductor pressure sensor 51 also differs from the sensor 41 in the third embodiment. More specifically, the enclosure 52 of the semiconductor pressure sensor 51 is formed into a generally trapezoidal configuration with a part of the rear wall inclined. In this case, too, the semiconductor pressure sensor 36 may be prevented from falling down rearward.
The foregoing disclosure and drawings are merely illustrative of the principles of the present invention and are not to be interpreted in a limiting sense. The only limitation is to be determined from the scope of the appended claims.
Claims (7)
1. A clothes washing machine comprising:
a) a water receiving tub for containing wash water;
b) an agitating member for agitating the wash water contained in said water receiving tub;
c) a motor for driving said agitating member;
d) an air trap provided so as to communicate to the interior of said water receiving tub such that the pressure of air contained in said air trap is increased in accordance with increase in the water level in said water receiving tub;
e) a semiconductor pressure sensor having an air inlet communicating to said air trap through air path forming means, thereby generating an electrical signal the magnitude of which depends upon the pressure of the air received in the air inlet thereof; and
f) an electronic circuit unit comprising an amplification circuit amplifying the output signal of said semiconductor pressure sensor and a control circuit controlling said motor, said electronic circuit unit being formed on one and the same circuit board together with said semiconductor pressure sensor.
2. A clothes washing machine according to claim 1, wherein said semiconductor pressure sensor comprises a semiconductive material having a piezoresistance effect that an internal electric resistance is varied in accordance with pressure applied thereto.
3. A clothes washing machine according to claim 1, which further comprises a casing enclosing the circuit board, said casing being provided with a support on which a part of said semiconductor pressure sensor is supported.
4. A clothes washing machine according to claim '1, which further comprises a casing enclosing the circuit board, said casing having one side wall recessed so as to be projected inward, said casing having a support projection formed away from the inwardly projected portion so that a part of said semiconductor pressure sensor is placed between the inwardly projected portion of said casing and the support projection and one side of said semiconductor pressure sensor abuts against the inwardly projected portion of said casing.
5. A clothes washing machine according to claim 3, wherein said semiconductor pressure sensor is mounted on said circuit board with the bottom thereof in contact with said circuit board and the width of the bottom of said semiconductor pressure sensor is larger than those of the other portions thereof.
6. A clothes washing machine according to claim 1, which further comprises a casing enclosing the circuit board, said casing having one side wall having an opening through which the air path forming means is disposed and wherein said semiconductor pressure sensor is positioned at the side of one end of said circuit board so that the side of said semiconductor pressure sensor having the air inlet is opposite to the side wall of said casing where the opening is formed.
7. A clothes washing machine substantially as described herein with reference to the accompanying drawings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1248389A JPH03111099A (en) | 1989-09-25 | 1989-09-25 | Washer |
| JP1278113A JPH03139399A (en) | 1989-10-25 | 1989-10-25 | Washing machine |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9015894D0 GB9015894D0 (en) | 1990-09-05 |
| GB2236332A true GB2236332A (en) | 1991-04-03 |
| GB2236332B GB2236332B (en) | 1994-04-13 |
Family
ID=26538745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9015894A Expired - Fee Related GB2236332B (en) | 1989-09-25 | 1990-07-19 | Clothes washing machine |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR940007610B1 (en) |
| GB (1) | GB2236332B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995016067A1 (en) * | 1993-12-07 | 1995-06-15 | Heber Limited | Washing machines |
| WO1998031865A1 (en) * | 1997-01-20 | 1998-07-23 | Aktiebolaget Electrolux | Washing machine |
| EP1598466A1 (en) * | 2004-05-21 | 2005-11-23 | Samsung Electronics Co., Ltd. | Washing machine with detection device |
| WO2008119812A1 (en) * | 2007-04-02 | 2008-10-09 | Arcelik Anonim Sirketi | A washing machine |
| US7946139B2 (en) * | 2007-11-14 | 2011-05-24 | Illinois Tool Works Inc. | Method and apparatus for upgrading washing machine water efficiency |
| CN102844489A (en) * | 2011-02-23 | 2012-12-26 | 松下电器产业株式会社 | Drum-type washing machine |
| US10928264B2 (en) | 2016-09-05 | 2021-02-23 | Tyco Electronics (Shanghai) Co. Ltd. | Sensor assembly and liquid level detection device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114737365B (en) * | 2022-04-08 | 2024-06-04 | Tcl家用电器（合肥）有限公司 | Protection device and washing machine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3013760A1 (en) * | 1980-04-10 | 1981-10-15 | Robert Bosch Gmbh, 7000 Stuttgart | Ignition control system for IC engine - has tubing connecting air inlet channel to pressure sensor mounted on circuit board |
| US4835991A (en) * | 1987-12-24 | 1989-06-06 | Whirlpool Corporation | Automatic water level control system for an automatic washer |
-
1990
- 1990-07-19 GB GB9015894A patent/GB2236332B/en not_active Expired - Fee Related
- 1990-09-25 KR KR1019900015421A patent/KR940007610B1/en not_active IP Right Cessation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3013760A1 (en) * | 1980-04-10 | 1981-10-15 | Robert Bosch Gmbh, 7000 Stuttgart | Ignition control system for IC engine - has tubing connecting air inlet channel to pressure sensor mounted on circuit board |
| US4835991A (en) * | 1987-12-24 | 1989-06-06 | Whirlpool Corporation | Automatic water level control system for an automatic washer |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995016067A1 (en) * | 1993-12-07 | 1995-06-15 | Heber Limited | Washing machines |
| WO1998031865A1 (en) * | 1997-01-20 | 1998-07-23 | Aktiebolaget Electrolux | Washing machine |
| EP1598466A1 (en) * | 2004-05-21 | 2005-11-23 | Samsung Electronics Co., Ltd. | Washing machine with detection device |
| WO2008119812A1 (en) * | 2007-04-02 | 2008-10-09 | Arcelik Anonim Sirketi | A washing machine |
| US7946139B2 (en) * | 2007-11-14 | 2011-05-24 | Illinois Tool Works Inc. | Method and apparatus for upgrading washing machine water efficiency |
| CN102844489A (en) * | 2011-02-23 | 2012-12-26 | 松下电器产业株式会社 | Drum-type washing machine |
| EP2679717A1 (en) * | 2011-02-23 | 2014-01-01 | Panasonic Corporation | Drum-type washing machine |
| EP2679717A4 (en) * | 2011-02-23 | 2014-07-09 | Panasonic Corp | Drum-type washing machine |
| CN102844489B (en) * | 2011-02-23 | 2015-02-04 | 松下电器产业株式会社 | Drum-type washing machine |
| US10928264B2 (en) | 2016-09-05 | 2021-02-23 | Tyco Electronics (Shanghai) Co. Ltd. | Sensor assembly and liquid level detection device |
Also Published As
| Publication number | Publication date |
|---|---|
| KR940007610B1 (en) | 1994-08-22 |
| GB9015894D0 (en) | 1990-09-05 |
| KR910006556A (en) | 1991-04-29 |
| GB2236332B (en) | 1994-04-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20080719 |