KR102158381B1 - Device for locking draw box of washing machine - Google Patents

Abstract

The present invention relates to a device for locking a draw box of a washing machine, which can automatically lock or unlock the draw box of the washing machine in a cabinet, and allows the draw box to be unlocked manually by pulling a lock release holder downward when an event such as failure of a drive motor occurs. In the device for locking a draw box of a washing machine according to the present invention, a gear box (10) and a base cover (20) are coupled, an intermediate plate (30) is disposed between the gear box (10) and the base cover (20), a drive motor (40) and a gear transmission means (50) for transmitting the power of the drive motor (40) are mounted on the gear box (10), an operation cam (60) is coupled to an output gear unit (55) of the gear transmission means (50), the operation cam (60) is rotationally disposed in a mounting hole (210) of the base cover (20), a sliding block (70) is mounted on the base cover (20) so that the sliding block (70) is moved up and down along a guide unit (220) of the base cover (20) by the operation cam (60), and a sliding protrusion (82) of a left locking lever (81) and a sliding protrusion (86) of a right locking lever (85) are disposed on the left of a bottom open triangle-shaped guide groove (710) formed in the sliding block (70) so that the left locking lever (81) and the right locking lever (85) are locked or unlocked in the locking unit of the cabinet (4) by the sliding block (70).

Description

Draw box locking device for washing machines {DEVICE FOR LOCKING DRAW BOX OF WASHING MACHINE}

The present invention relates to a draw box locking device for a washing machine that locks or unlocks a draw box in a washing machine referred to as a "twin washing machine", and more particularly, it is possible to automatically lock or unlock the draw box of the washing machine in a cabinet. , When an event such as a failure of a drive motor occurs, a draw box locking device for a washing machine capable of releasing the lock by pulling the lock release holder downward so that the draw box can be opened manually.

Korean Patent No. 10-1844234 (registered on March 27, 2018) introduces a "control method of a clothing processing device".

In the control method of the laundry treatment apparatus, since locking or unlocking of the first bar and the second bar of the fastening unit is electronically controlled, it is necessary to manually unlock the first bar and the second bar due to a motor failure. There is a drawback of not being able to cope with it when it occurs.

In Korean Patent Publication No. 10-2017-0059690 (published on May 31, 2017), "a door locking device for a washing machine and a door locking method" is introduced.

The door lock device for the washing machine includes a housing, a door release position for releasing the door, a door release position for releasing the door, a switch position and the door release position, and A first latch positioned between the switching positions and movable to a door locking position for locking the door, a spring disposed in the housing and biasing the first latch to the door release position, and the first latch to the door A second latch releasably locked to a locking position; a second latch movably disposed in the housing and releasably locking the first latch; locking the first latch to the door locking position; and locking the first latch A third latch that is pushed and released against the spring from the door locking position to the switching position; a driving motor disposed in the housing to drive the third latch; and a driving motor operatively coupled to the driving motor to 3 It includes a latch drive mechanism for moving the latch.

However, since the door locking device does not have a configuration for manually unlocking the door, there is a disadvantage in that the door cannot be opened manually when an event such as a failure of a drive motor occurs.

Accordingly, an object of the present invention is that the power of the drive motor disposed in the gearbox is transmitted to the operating cam through the gear transmission means, so that the sliding block mounted on the base cover by the operating cam slides up and down along the guide portion of the base cover. , The sliding protrusion of the left locking lever and the sliding protrusion of the right locking lever are arranged in the "∧"-shaped guide groove formed in the sliding block, and the left locking lever and the right locking lever are moved left and right by the sliding block, thereby locking the left. It is to provide a draw box locking device for a washing machine in which the lever and the right locking lever are automatically locked or unlocked in the locking part of the cabinet.

Another object of the present invention is when the unlocking holder is connected to the knob of the operating cam through a wire, and the gear transmission means includes a clutch unit, so that the draw box must be manually opened in a draw-type washing machine (for example, a drive motor In the case of an event such as a failure of the machine), the user can pull the unlocking holder downward to release the lock, thereby providing a draw box locking device for a washing machine that can manually open the draw box of the washing machine.

An example of a draw box locking device for a washing machine according to the present invention for achieving the above object is a gearbox and a base cover are coupled, an intermediate plate is disposed between the gearbox and the base cover, and a drive motor and a drive in the gearbox A gear transmission means for transmitting the power of the motor is mounted, an operating cam is coupled to the output gear unit of the gear transmission means, the operating cam is rotatably disposed in the mounting hole of the base cover, and a sliding block is mounted on the base cover. , The sliding block is moved up and down along the guide part of the base cover by the operating cam, and the sliding protrusion of the left locking lever and the sliding protrusion of the right locking lever are arranged in the guide groove of the "∧" shape formed in the sliding block. It is characterized in that the left locking lever and the right locking lever are locked or unlocked by the locking part of the cabinet.

In addition, in the draw box locking device for a washing machine according to the present invention, one end of the wire is connected to the knob of the operating cam, the unlocking holder is connected to the other end of the wire, and the gear transmission means includes a clutch unit, thereby operating through the wire. When an external force is applied to the cam knob, the power transmission of the gear transmission means is cut off by the clutch unit, and the operating cam turns idle, and the knob of the operating cam goes down from the upper position to the lower position, and the knob descends. In the process, the knob pulls the sliding block downward, and the sliding block moves downward along the guide portion of the base cover, and the sliding projection of the left locking lever and the sliding projection of the right locking lever are " As a result of relatively moving from the lower end of the guide groove of the sliding block formed in the ∧" shape toward the upper vertex, the gap between the left and right locking levers is narrowed and the locking of the left and right locking levers is released. It is characterized by that.

The gear transmission means is characterized in that it is composed of an electric gear unit interlocked with the drive motor, a clutch unit interlocked with the electric gear unit, and an output gear unit interlocked with the clutch unit.

In the electric gear unit, a worm gear and a spur gear are integrally formed, so that a spur gear is arranged on the top of the worm gear, and the worm gear meshes with the worm of the driving motor, and the power of the driving motor is input to the worm gear, and the spur gear It is characterized in that it is transmitted to the clutch unit through.

In the clutch unit, a plurality of first protrusions formed on the upper surface of the flywheel and a plurality of second protrusions formed on the lower surface of the clutch plate are engaged with each other, the flywheel is elastically supported by a spring, and the flywheel and the clutch plate rotate. To be able to, it is characterized in that the shaft is fitted to the flywheel and the clutch plate.

The flywheel has a gear formed on the outer circumferential surface, a plurality of first protrusions are formed on the upper surface, the first protrusions in a square shape are arranged radially at regular intervals around the hollow part, and the lower surface is elastically formed by a spring. It is characterized by being supported.

The clutch plate is characterized in that a plurality of second protrusions are formed on a lower surface at regular intervals, the second protrusions engage with the first protrusions of the flywheel, and a gear is formed on the upper surface of the clutch plate.

The actuating cam includes a disk portion, a knob formed on the upper surface of the disk portion, a fan-shaped nose portion formed on the lower surface of the disk portion, and a gear engaging portion formed integrally with the nose portion, and disposed in the center of the disk portion. It characterized in that it is configured.

Drew box locking device for a washing machine according to the present invention is characterized in that it further comprises a switching terminal on / off by the nose portion of the operating cam.

The switching terminal is composed of a movable piece and a fixed piece, and in the process of rotating the working cam, the nose of the working cam pushes the movable piece, and when the movable piece contacts the fixed piece, it is turned on. It is characterized in that when the nose part is removed from the movable piece, the movable piece is returned to its original position, and the connection between the movable piece and the fixed piece is broken.

Thereby, the draw box locking device for a washing machine according to the present invention can automatically lock or unlock a draw box in a cabinet in a draw type washing machine, and a failure of the drive motor When an event such as, for example, occurs, the lock release holder is pulled downward to release the lock, so that the draw box of the washing machine can be opened manually.

1 schematically illustrates a state in which a draw box locking device for a washing machine according to the present invention is mounted on a draw box of a twin washing machine.
2 is a perspective view showing a draw box locking device for a washing machine according to the present invention.
3 is an exploded perspective view showing a draw box locking device for a washing machine according to the present invention.
4 and 5 are schematic diagrams for explaining locking and unlocking operations of the draw box locking device for a washing machine according to the present invention.
6 and 7 illustrate an example in which the knob of the operating cam moves downward when the user pulls the wire downward, and the sliding block is lowered by the knob, whereby the locking of the left and right locking levers is manually released. It is shown.
FIG. 8 is a plan view for explaining an operation relationship between the operation cam and the gear transmission means corresponding to the position of FIG. 6.
9 is a plan view for explaining an operation relationship between the operation cam and the gear transmission means corresponding to the position of FIG. 7 and the operation cam.
10 is an exploded perspective view showing a coupling structure of a gear transmission means and an operation cam.
11 is a perspective view showing the clutch unit.
12 is a cross-sectional view taken along line AA of FIG. 11 showing the clutch unit.
13 is an exploded perspective view showing the clutch unit.
14 is a perspective view showing the output gear unit.
15 and 16 are schematic diagrams showing that the switching terminal is turned on/off by the nose portion of the operating cam.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, a draw box locking device 1 for a washing machine according to the present invention is a draw box 5 drawn in/out from a draw-type washing machine (3; washing machine of draw type) into a cabinet (4). It is mounted on the front part of and is covered by the front cover 6 so as not to be exposed to the outside.

For reference, the draw-type washing machine 3 corresponds to a draw box portion of a draw-in/withdraw method in a washing machine known as a “twin washing machine” at present.

2 to 5, in the draw box locking device 1 for a washing machine according to the present invention, a gear box 10 and a base cover 20 are coupled, and between the gear box 10 and the base cover 20 The intermediate plate 30 is disposed on the gear box 10, and the gear transmission means 50 for transmitting the power of the drive motor 40 and the drive motor 40 is mounted on the gear box 10, and the output of the gear transmission means 50 The operation cam 60 is coupled to the gear unit 55, the operation cam 60 is rotatably disposed in the mounting hole 210 of the base cover 20, and the sliding block 70 on the base cover 20 Is mounted, the sliding block 70 is moved up and down along the guide portion 220 of the base cover 20 by the operating cam 60, the guide groove of the "∧" shape formed in the sliding block 70 ( The sliding protrusion 82 of the left locking lever 81 and the sliding protrusion 86 of the right locking lever 85 are arranged at 710, and the left locking lever 81 and the right locking lever are arranged by the sliding block 70. 85 is locked or unlocked in a locking portion (not shown) of the cabinet 4 (see FIG. 1 ), and the sliding block 70 is covered by the protective cap 90.

The operation of the draw box locking device for a washing machine according to the present invention configured as described above will be described with reference to FIGS. 4 and 5.

4 is a state in which the left locking lever 81 and the right locking lever 85 are locked to the cabinet locking part of a washing machine of draw type, and FIG. 5 is a left locking lever 81 and a right locking lever. (85) is unlocked in the cabinet locking part of the draw type washing machine.

First, as shown in FIG. 4, the sliding protrusion 82 of the left locking lever 81 and the sliding protrusion 86 of the right locking lever 85 are formed in the sliding block 70 in a "∧" shape guide groove ( In a state where the knob 620 of the operation cam 60 disposed at the lower end of the 710 and disposed in the long hole 720 of the sliding block 70 is located at the starting point, the rotation of the driving motor 40 (see FIG. 3 ). As the power is transmitted to the operating cam 60 through the gear transmission means 50 (see FIG. 3), the knob 620 of the operating cam 60 rotates angularly from FIG. 4 to FIG. 5.

In this way, when the knob 620 of the operation cam 60 moves from the lower position of FIG. 4 to the upper position in the direction of the arrow 66 of FIG. 5 by each rotation of the operation cam 60, the operation cam 60 ) In the process of moving the knob 620 from the top to the bottom, the knob 620 of the operation cam 60 pulls down the sliding block 70 in the direction of the arrow 66 of FIG. 5, the sliding block 70 ) Is lowered along the guide portion 220 of the base cover 20.

At this time, the sliding protrusion 82 of the left locking lever 81 and the sliding protrusion 86 of the right locking lever 85 are the upper vertices at the lower end of the guide groove 710 formed in a "∧" shape in the sliding block 70 As it moves relative to the side, the left locking lever 81 moves from left to right as in the direction of arrow 82 in FIG. 5, and at the same time, the right locking lever 85 moves in the direction of arrow 87 in FIG. By moving from the right to the left, the tip of the left locking lever 81 is removed from the locking part (not shown) of the cabinet, and the locking of the left locking lever 81 is released. The tip is released from the locking part (not shown) of the cabinet and the lock is released.

And, when the operation cam 60 is each rotated, the knob 620 of the operation cam 60 is moved from the lower position of Figure 5 to the upper position of Figure 4, the knob 620 of the operating cam 60 In the process of moving from the lower position to the upper position, the knob 620 of the operating cam 60 pushes the sliding block 70 in the direction of the arrow 67 in FIG. 4, so that the sliding block 70 is the base cover. It moves upward along the guide part 220 of (20).

At this time, the sliding protrusion 82 of the left locking lever 81 and the sliding protrusion 86 of the right locking lever 85 relatively move from the top of the vertex to the lower end of the guide groove 710 formed in a "∧" shape. , As the left locking lever 81 moves from right to left as in the direction of arrow 84 in FIG. 4, and the right locking lever 85 moves from left to right as in the direction of arrow 88 in FIG. , The front end of the left locking lever 81 enters and locks the locking portion (not shown) of the cabinet, and at the same time, the front end of the right locking lever 85 enters and locks the locking portion (not shown) of the cabinet.

6 to 9, in addition, in the draw box locking device for a washing machine according to the present invention, one end of the wire 650 is connected to the knob 620 of the operating cam 60, and the other end of the wire 650 The unlocking holder 660 is connected, and the gear transmission means 50 (see FIGS. 8 and 9) includes a clutch unit 53 (see FIGS. 8 and 9), thereby operating cam 60 through the wire 650. ), when an external force is applied to the knob 620, the power transmission of the gear transmission means 50 is cut off by the clutch unit 53, and the operating cam 60 is idle, and the knob of the operating cam 60 The 620 is lowered from the upper position of FIG. 6 to the lower position of FIG. 7, and in the process of lowering the knob 620, the knob 620 pulls the sliding block 70 downward, so that the sliding block ( 70) moves downward along the guide portion 220 of the base cover 20, and as described above with reference to FIGS. 4 and 5, the lowering of the left locking lever 81 The sliding protrusion 82 and the sliding protrusion 86 of the right locking lever 85 relatively move from the lower end of the guide groove 710 of the sliding block 70 formed in a "∧" shape toward the upper vertex. , As the gap between the left locking lever 81 and the right locking lever 85 is narrowed, the locking of the left locking lever 81 and the right locking lever 85 is released.

The unlocking of the left locking lever 81 and the right locking lever 85 has already been described above with reference to FIGS. 4 and 5.

In the draw box locking device for a washing machine according to the present invention configured as described above, when it is necessary to manually open the draw box in a draw-type washing machine (for example, when an event such as a failure of a driving motor occurs), the user can unlock the lock release holder ( When the 660 is pulled downward, as described above, the power transmission of the gear transmission means 50 by the clutch unit 53 is cut off, so that the operating cam 60 is angularly rotated by an external force, and the operating cam 60 ) Of the knob 620 is lowered from the upper position to the lower position, the sliding block 70 is moved downward along the guide portion 220 of the base cover 20 by the knob 620, the left locking lever As the gap between (81) and the right locking lever 85 is narrowed, the locking of the left locking lever 81 and the right locking lever 85 is released.

As described above, in the draw box locking device for a washing machine according to the present invention, when an event such as a failure of a driving motor occurs, the lock release holder 660 is pulled downward to release the lock, so that the draw box of the washing machine can be manually opened. have.

The components of the draw box locking device for a washing machine according to the present invention constructed and operated as described above will be described in detail with reference to the drawings.

Referring to FIG. 10, the gear transmission means 50 includes an electric gear unit 51 interlocked with the driving motor 40, a clutch unit 53 interlocked with the electric gear unit 51, and a clutch. It consists of an output gear unit 55 interlocked with the unit 53.

The drive motor 40 has a worm 420 (worm) mounted on the drive shaft 410.

In the electric gear unit 51, a worm gear 511 and a spur gear 512 are integrally formed, so that a spur gear 512 is disposed on the worm gear 511, and the worm gear 511 is a driving motor. Engaged with the worm 420 of 40, the power of the driving motor 40 is input to the worm gear 511, and transmitted to the clutch unit 53 through the spur gear 512.

11 to 13, the clutch unit 53 includes a plurality of first protrusions 532 formed on the upper surface of the flywheel 530 and a plurality of second protrusions formed on the lower surface of the clutch plate 540 ( 541 are engaged with each other, the flywheel 530 is elastically supported by the spring 535, and the flywheel 530 and the clutch plate 540 rotate so that the flywheel and the clutch plate 540 have a shaft ( 545) is inserted.

The flywheel 530 has a gear 531 formed on an outer circumferential surface thereof, a plurality of first protrusions 532 are formed on an upper surface thereof, and a first protrusion 532 in a rectangular shape is radially centered on the hollow part 533. Are arranged at regular intervals, and the lower surface is elastically supported by the spring 535.

The clutch plate 540 has a plurality of second protrusions 541 formed on the lower surface at regular intervals, so that the second protrusions 541 are engaged with the first protrusions 532 of the flywheel 530, and Gear 543 is formed.

In the clutch unit 53 configured as described above, the gear 531 of the flywheel 530 meshes with the spur gear 512 of the electric gear unit 51, and the first protrusion 532 of the flywheel 530 and the clutch plate The second protrusions 541 of 540 mesh with each other, and the gear 543 of the clutch plate 540 meshes with the spur gear 551 of the output gear unit 55, so that the rotational power of the electric gear unit 51 It is transmitted to the flywheel 530, the rotational power of the flywheel 530 is transmitted to the clutch plate 540, and the rotational power of the clutch plate 540 is transmitted to the output gear unit 55.

However, as described with reference to FIGS. 6 and 7, when the user pulls the unlocking holder 660 downward, the operation cam 60 can rotate in reverse by the force applied to the knob 620, The force applied to the 60 is transmitted to the clutch plate 540 through the output gear unit 55, and the flywheel 530 is elastically supported by the spring 535 by the force transmitted to the clutch plate 540 The second protrusion 541 of the clutch plate 540 meshed with the first protrusion 532 of the flywheel 530 is pressed relatively and rises by pressing the first protrusion 532 of the flywheel 530, and thus the flywheel The 530 does not rotate, and the clutch plate 540 rotates relative to the flywheel 530.

In this way, by rotating the clutch plate 540 relative to the flywheel 530, the knob 620 of the operating cam 60 can be lowered.

14, in the output gear unit 55, a spur gear 551 meshes with a gear 543 of a clutch plate 540, and an output gear 553 is located in the center of the upper surface of the spur gear 551. Is formed, the output gear 553 is coupled with the engaging portion 640 of the operating cam 60.

Referring again to FIG. 10, the operation cam 60 includes a disc part 610, a knob 620 formed on the upper surface of the disc part 610, and a fan shape formed on the lower surface of the disc part 610. It is formed integrally with the nose portion 630 of the shape and the nose portion 630, and is composed of a gear engaging portion 640 disposed in the center of the disk portion 610.

Referring to FIG. 10 again, the draw box locking device for a washing machine according to the present invention further includes a switching terminal 65 that is turned on/off by the nose portion 630 of the operating cam 60.

15 and 16, the switching terminal 65 is composed of a movable piece 651 and a fixed piece 653, and as shown in FIG. 16, the nose portion 630 of the operating cam 60 is When the movable piece 651 is pushed, the movable piece 651 is turned on when it comes into contact with the fixed piece 653, and as shown in FIG. 15, the nose portion of the actuating cam 60 is rotated by the rotation of the actuating cam 60. When 630 deviates from the movable piece 651, the movable piece 651 is returned to its original position, the connection between the movable piece 651 and the fixed piece 653 is disconnected, and is turned off.

The washing and spinning processes of the washing machine are controlled by the on/off signal of the switching terminal 65.

10: gearbox 20: base cover
30: intermediate plate 40: drive motor
50: gear transmission means 60: operating cam
70: sliding block 81: left locking lever
85: right locking lever 90: protective cap

Claims (10)

The gearbox 10 and the base cover 20 are coupled, the intermediate plate 30 is arranged between the gearbox 10 and the base cover 20, and the drive motor 40 and the drive in the gearbox 10 The gear transmission means 50 for transmitting the power of the motor 40 is mounted, the operating cam 60 is coupled to the output gear unit 55 of the gear transmission means 50, and the operating cam 60 is a base cover It is rotatably disposed in the mounting hole 210 of (20), the sliding block 70 is mounted on the base cover 20, the sliding block 70 by the operating cam (60) of the base cover (20) It is moved up and down along the guide part 220, and the sliding protrusion 82 of the left locking lever 81 and the right locking lever 85 in the guide groove 710 of a "∧" shape formed in the sliding block 70 A draw for washing machine, characterized in that the sliding protrusion 86 is disposed so that the left locking lever 81 and the right locking lever 85 are locked or unlocked in the locking part of the cabinet 4 by the sliding block 70. Box locking device.
The method of claim 1,
One end of the wire 650 is connected to the knob 620 of the operating cam 60, the unlocking holder 660 is connected to the other end of the wire 650, and the gear transmission means 50 is the clutch unit 53 ), when an external force is applied to the knob 620 of the operating cam 60 through the wire 650, the power transmission of the gear transmission means 50 is cut off by the clutch unit 53, and the operating cam (60) is idle, the knob 620 of the operating cam 60 is lowered from the upper position to the lower position, and in the process of the knob 620 descending, the knob 620 moves the sliding block 70 As it is pulled down, the sliding block 70 moves downward along the guide part 220 of the base cover 20, and the sliding protrusion of the left locking lever 81 is lowered by the sliding block 70 ( 82) and the sliding protrusion 86 of the right locking lever 85 are relatively moved from the lower end of the guide groove 710 of the sliding block 70 formed in a "∧" shape toward the upper vertex, thereby locking the left A draw box locking device for a washing machine, characterized in that locking of the left locking lever 81 and the right locking lever 85 is released as the gap between the lever 81 and the right locking lever 85 is narrowed.
The method according to claim 1 or 2,
The gear transmission means 50 is interlocked with an electric gear unit 51 interlocked with the driving motor 40, a clutch unit 53 interlocked with the electric gear unit 51, and a clutch unit 53 Draw box locking device for a washing machine, characterized in that consisting of an output gear unit (55).
The method of claim 3,
In the electric gear unit 51, a worm gear 511 and a spur gear 512 are integrally formed, so that a spur gear 512 is disposed on the worm gear 511, and the worm gear 511 is a driving motor. A draw box for a washing machine, characterized in that it meshes with the worm 420 of 40, and the power of the driving motor 40 is input to the worm gear 511, and is transmitted to the clutch unit 53 through the spur gear 512. Locking device.
The method of claim 3,
In the clutch unit 53, a plurality of first protrusions 532 formed on an upper surface of the flywheel 530 and a plurality of second protrusions 541 formed on a lower surface of the clutch plate 540 are engaged with each other, and the flywheel ( Characterized in that the shaft 545 is fitted to the flywheel and the clutch plate 540 so that the 530 is elastically supported by the spring 535 and the flywheel 530 and the clutch plate 540 rotate. Draw box locking device for washing machine.
The method of claim 5,
The flywheel 530 has a gear 531 formed on an outer circumferential surface thereof, a plurality of first protrusions 532 are formed on an upper surface thereof, and a first protrusion 532 in a rectangular shape is radially centered on the hollow part 533. It is arranged at regular intervals, and the draw box locking device for a washing machine, characterized in that the lower surface is elastically supported by the spring (535).
The method of claim 5,
The clutch plate 540 has a plurality of second protrusions 541 formed on the lower surface at regular intervals, so that the second protrusions 541 are engaged with the first protrusions 532 of the flywheel 530, and A draw box locking device for a washing machine, characterized in that a gear 543 is formed.
The method according to claim 1 or 2,
The operating cam 60 includes a disk portion 610, a knob 620 formed on the upper surface of the disk portion 610, and a fan-shaped nose portion 630 formed on the lower surface of the disk portion 610 And, a draw box locking device for a washing machine, which is formed integrally with the nose portion 630 and is configured with a gear engaging portion 640 disposed in the center of the disk portion 610.
The method according to claim 1 or 2,
Draw box locking device for a washing machine, characterized in that it further comprises a switching terminal (65) on / off by the nose portion (630) of the operation cam (60).
The method of claim 9,
The switching terminal 65 is composed of a movable piece 651 and a fixed piece 653, the nose portion 630 of the operating cam 60 pushes the movable piece 651, the movable piece 651 is a fixed piece When it comes into contact with (653), it is turned on, and when the nose portion 630 of the operating cam 60 is removed from the movable piece 651 by rotation of the operating cam 60, the movable piece 651 is returned to its original position, A draw box locking device for a washing machine, characterized in that the connection between the movable piece 651 and the fixed piece 653 is cut off.

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