JPH0755278B2 - Washing machine lid switch - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating structure of a washing machine, and proposes an improvement of a structure of a cover switch, particularly a contact portion, when operating control of the washing machine is electronic. .

Constitution of the conventional example and its problems Regarding the lid switch of the washing machine for electronically controlling the operation, the contact portion is made of a flexible material such as a thin phosphor bronze plate or a stainless plate as shown in FIG. A movable contact piece 1 and a fixed contact piece 2 are formed, and the phosphor bronze plate is silver-plated on its surface to form contacts, and the stainless plate is
Although it was made as a contact with the material as it is or by plating the surface with gold, in many cases when controlling electronically, it is controlled by a minute voltage and a minute current. Is line contact or point contact, and when fine organic dust such as fine powder of detergent adheres, there is a case where conduction is poor and operation is stopped. Alternatively,
The vibration during the dehydration operation may cause the contact portion to wear and corrode, resulting in poor conduction.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks. By improving the flexibility of the contact piece, even when foreign matter such as dust adheres between the contacts, poor conduction due to the foreign matter is caused. (EN) Provided is an inexpensive lid switch with a very simple structure in which the contact rate is drastically reduced, the adverse effect of vibration on contacts is significantly reduced, and the durability is improved.

The present invention relates to a lid lever that is displaced in association with opening and closing of a lid, a safety lever that is displaced in association with abnormal vibration of a water tank, a switch having a fixed contact piece and a movable contact piece, a lid lever and a safety contact piece. The displacement of the lever is transmitted to the movable contact of the above switch,
A movable body that moves the movable contact piece so as to separate from the fixed contact piece when the lid is open or the water tank is abnormally vibrated.
The fixed contact piece of the switch is branched into a plurality of pieces by forming a slit from the end portion toward the central portion, and the branched contact piece of the fixed contact piece and the movable contact piece are in a substantially cylindrical shape in an orthogonal relationship. Welded contacts.

Therefore, the chances of defective conduction are reduced by providing a plurality of branch contacts on the fixed contact piece.

Description of Embodiments FIGS. 1 and 2 are sectional views of a lid switch showing an embodiment of the present invention, FIG. 3 is an operation diagram of a movable body portion, FIG. 4 is an exploded perspective view thereof, and FIG. Shows an enlarged perspective view of the contact portion. FIG. 1 shows a state in which the lid 21 of the washing machine is closed. A lid lever 24 having an anchor 23 fixed to the tip by an operation protrusion 22 protruding to the rear of the lid 21.
Is rotatably supported in the clockwise direction in FIG. 2 with a bearing portion 26 formed on the stitch base 25 as the center of rotation. The lid lever 24 can be easily processed by manufacturing it with a steel wire or the like. The switch base 25 is made of an insulating plastic material, and the fixed contact piece 27 and the movable contact piece 28 are integrally molded.
In particular, the movable contact piece 28 is made of a flexible material such as a thin copper plate or a stainless plate. Since the lid 21 is closed as shown in FIG. 1, the fixed contact piece 27 and the movable contact piece 28 are in the ON state. In order to make the same ON state, the safety lever 29 is moved upward by the lid lever 24, and one end of the movable body 30 rotatably supported on the upper end of the safety lever 29 is used to move the above-mentioned movable piece 28. The tip L-shaped bent portion 28 'is pressed. A part of the movable body 30 is rotatably supported by a safety lever 29, while it is loosely fitted in a deformed hole 32 formed in a U-shaped substrate 31 made of a thin steel plate and having a long dimension in the vertical direction. The slide protrusion 33 is formed of an electrically insulating material such as a synthetic resin material. The switch base 25 described above is fixed to the substrate 31, while the safety lever 29 is rotatably held by the protruding piece 34 at the end portion on the lid 21 side. A pressing coil spring 37 is provided between the protrusion 35 on the outer bottom surface of the substrate 31 and the protrusion 36 of the safety lever 29.
Insert the coil spring, and use this one coil spring 37 for the safety lever.
While pressing the substrate 29 downward with respect to the substrate 31, the clockwise rotational biasing force is retained. When the lid 21 is opened, the lid lever 24 rotates counterclockwise around the bearing portion 26, and the safety lever 29 also moves downward.
Moving downward along 32, the urging force that presses the movable contact piece 28 upward is released, and thus the lid switch is turned off.

FIG. 2 shows a case in which clothes are largely eccentric in a dehydration / washing tub (not shown) to be in a dehydrated state, and the water tub (not shown) presses the safety lever 29 in the direction of arrow A. At this time, the safety lever 29 rotates counterclockwise against the pressing force of the coil spring 37 with the protruding piece 34 of the substrate 31 as the center of rotation, and further moves the movable body 30 slightly leftward as shown in FIG. 3C. Move to. At this time, the movable body 30 slightly moves in the odd-shaped hole 32 of the substrate,
Moves clockwise with respect to the safety lever 29,
The refraction part 28 'moves so as to move downward and is turned off.

This operation will be described with reference to the detailed enlarged view of FIG. Third
Figure (a) shows a state in which the lid is open, that is, the state between the contact pieces is OFF. FIG. 3B shows a state in which the lid is closed, that is, the contact pieces 27, 28 are ON. The movable body 30 has a movable contact piece 28 at its right end 38.
Press. FIG. 3 (c) shows the case where the safety lever 29 is operated, and the movable body 30 has its shaft support 40 moved to the left by the safety lever 29 so that the movable contact piece is moved to the concave portion 41 provided in the right end tongue piece 38. 28
The tip of the movable contact piece 28 moves downward and the OF
It becomes F state. The safety lever 29 can be rotated clockwise by a pressing coil spring 37 as shown in FIGS.
Even if the movable piece moves to, the state immediately returns to the state of FIG. 3 (b).

Operation OFF-ON control when the lid of the washing machine is opened and closed is the third
This is performed by the operations shown in FIGS.

The imbalance detection is performed by the operation shown in FIGS. 3 (b) and 3 (c).

In the electronically controlled lid switch, it is necessary to make a large difference between the opening and closing of the lid and the opening and closing of the contact due to the operation of the safety lever as described above. For this reason, it is necessary to lengthen the contact OFF-ON time when opening and closing the lid so that the user does not mistakenly detect that the imbalance is detected when the lid is opened and closed quickly. In the present invention, this point is effectively achieved by the shape of the movable body 30 when the lid is opened and closed and when the safety lever is operated by the shape of the movable body 30 and the support of the movable body by the safety lever. FIG. 4 is an exploded arrow view of the lid switch section.

As described above, the movable body is made of a plastic material having electrical insulation by molding into a substantially U-shaped planar shape, and the convex portion 42 formed on the side surface of the safety lever 29 has a U-shaped arm portion. A small hole 43 provided in 43 is loosely fitted and supported rotatably,
The protrusion 33 provided on the arm portion 43 is a deformed hole formed on the substrate 31 described above.
It is loosely fitted so that it can slide up and down. This attachment is a movable body
This is done using the flexibility of 30 plastics.

The lid lever 24 is rotatably held by penetrating a supporting small hole 45 formed in the safety lever 29 and inserting an L-shaped bent portion 46 at the rear end into a bearing portion 26 provided integrally with the switch base 25. It

FIG. 5 is an enlarged perspective view of the contact portion. Reference numeral 47 is a slit formed from the end of the fixed contact piece 27 toward the central portion, and the fixed contact piece 27 is branched by the slit 47, and the branched portion 4
It forms 8,48 '. The movable contact piece 28 is welded with a substantially semi-cylindrical movable contact 49, and the fixed contact piece 27 has branch portions 48, 48 'with substantially semi-cylindrical fixed contacts 50, 50', respectively. Welded so that it is orthogonal to 49.

EFFECTS OF THE INVENTION As described above, according to the present invention, since the fixed contact piece is formed with the slit, the flexibility of the contact piece is improved, the contact pressure can be reduced, and the vibration can be reduced during dehydration operation. Even if it occurs, the contact wear is reduced and the durability is greatly improved. In addition, since the contact piece of the fixed contact piece is branched into a plurality of pieces by the slit, even if some conduction failure occurs, the entire connection is in the conduction state, and the reliability as the switch is remarkably improved.

Further, even if dust or the like adheres to the contact portion, the fixed and movable contacts are in an orthogonal relationship, and so-called wiping action can be expected, so there is no hindrance to the switch function. It is possible to improve the characteristics as.

[Brief description of drawings]

FIG. 1 is a sectional view of a lid switch showing an embodiment of the present invention,
FIG. 2 is a sectional view of the lid switch in an operating state, FIG.
(A), (b) and (c) are cross-sectional views of essential parts showing the operating state of the lid switch, and FIG. 4 is an exploded perspective view of the lid switch, and FIG.
FIG. 6 is an enlarged perspective view of the contact portion, and FIG. 6 is an enlarged perspective view of a conventional contact portion. 21 …… Lid, 24 …… Lid lever, 27 …… Fixed contact piece, 28 …… Movable contact piece, 29 …… Safety lever, 30 …… Movable body, 31 …… Board, 47 …… Slit, 48, 48 ´ …… Branch part, 49 …… moving contact, 50,50´ …… fixed contact.

Claims (1)

[Claims] 1. A lid lever which is displaced in association with opening and closing of the lid,
The safety lever that is displaced in association with the abnormal vibration of the water tank, the switch that has the fixed contact piece and the movable contact piece, and the displacement of the lid lever and the safety lever are transmitted to the movable contact piece of the above switch so that the lid is open or the water tank A movable body that moves the movable contact piece so as to separate from the fixed contact piece in an abnormal vibration state, and the fixed contact piece of the switch is divided into a plurality of parts by forming a slit from the end portion toward the central portion. Cage,
And the lid switch of the washing machine, in which the fixed contact piece is branched and the movable contact piece is welded with substantially cylindrical contacts in an orthogonal relationship.