JPH0752062B2 - Door switch for refrigerator / freezer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a door switch of a refrigerator-freezer.

2. Description of the Related Art In recent years, refrigerators and freezers have tended to be larger and have more rooms, and door switches are required to have a plurality of lighting bulbs and a function for turning on and off a fan motor for circulating cold air.

A conventional door switch for a refrigerator / freezer as described above will be described below with reference to the drawings with reference to FIGS. 13 and 14.

FIG. 13 shows the relationship between a light bulb of a conventional refrigerator-freezer and a fan motor door switch, 1 is a light bulb for illumination installed in a freezer compartment, 2 is a light bulb for illumination installed in a refrigerating compartment, Reference numeral 3 is a fan motor for forcibly circulating cold air in the freezer compartment and the refrigerator compartment, and 4 is a door switch for turning on and off the light bulb and the fan motor according to opening and closing of a door (not shown).

Next, FIG. 14 shows the structure of the door switch 4.

Reference numeral 5 is a case made of synthetic resin. Case 5 is 6a and 6b
Each of them is operated by a door with an operating stick that protrudes more freely.

Numerals 7a and 7b are springs for urging the operating rods 6a and 6b upward (in the projecting direction) in the drawing, and are mounted in the case 5.
Reference numerals 8a and 8b denote steel balls attached to recesses 6c formed on both sides of the operating rods 6a and 6b in the case 5. 9a and 9b are switches S
A movable contact plate for W3 and SW4. Reference numeral 10 denotes a fixed contact plate corresponding to the movable contact plate 9a, which is connected to the electric bulb 1 shown in FIG.
Reference numeral 11 denotes another fixed contact plate corresponding to the movable contact plate 9a, which is connected to the fan motor 3 shown in FIG. 12
Is a fixed contact plate corresponding to the movable contact plate 9b, which is connected to the electric bulb 2 shown in FIG. 13 and also externally connected to the fixed contact plate 10. 13 is the movable contact plate 9b
The L-shaped terminal corresponding to is connected to the power supply. Reference numeral 14 is a connection plate which forms a fixed contact 14a corresponding to the movable contact plate 9b at one end and the movable contact plate 9 at the other end.
It is electrically connected to and holds a.

The operation of the door switch for a refrigerator-freezer constructed as above will be described below.

First, the positions of the operating rods 6a and 6b in FIG. 13 show a state in which the doors are open in both chambers, and both operating rods 6a and 6b are case 5
More prominent. In this state, the movable contact plate 9a is in contact with the fixed contact plate 10 and the movable contact plate 9b is in contact with the fixed contact plate 12, respectively, so that the light bulbs 1 and 2 in FIG.
is doing. Next, when the door is closed and the operating rod 6b is retracted by the door, the movable contact plate 9b is rotated by the movement of the steel ball 8b using the contact portion of the terminal 13 as a hinge to contact the connection plate 14.
This turns off the power supply circuit for the light bulb 2. However, since the other movable contact plate 9a is in contact with the fixed contact plate 10, the fan motor 3 remains off. When the other door is further closed, the operating rod 6a is pushed, and the movable contact plate 9a is rotated by the movement of the steel ball 8a using the contact portion with the connection plate 14 as a hinge to contact the fixed contact plate 11 and the bulb. Turn OFF 1 and turn ON the fan motor 3. As a result, cold air is forcedly circulated to the freezer compartment and the refrigerator compartment.

Also, with the operating rod 6b protruding, close the door and
When is pressed, the movable contact plate 9a is rotated by the movement of the steel ball 8a with the contact portion with the connection plate 14 as a hinge, and is separated from the fixed contact plate 10 and abuts the fixed contact plate 11, Since it is externally connected to the fixed contact plate 12, the fan motor 3 remains ON.

Problems to be Solved by the Invention In such a configuration, when only the operating rod 6a is pushed,
It had a drawback that the fan motor 3 did not turn off.
Furthermore, in order for the fan motor to turn on, the fixed contact plate 1
1, the movable contact plate 9a, the connection plate 14, the movable contact plate 6b, and the fixed contact plate 13 must be passed, and the number of contact portions is increased, so that there is a drawback that contact and switching reliability is low.

In view of the above-mentioned drawbacks, the present invention provides a door switch for a refrigerator / refrigerator that can turn on and off the light bulb and the fan motor in the two chambers independently of each other and is reliable in switching.

Means for Solving the Problems In order to solve the above problems, the refrigerator / freezer door switch of the present invention independently turns on and off the light bulbs of the two chambers by the operating piece integrally formed on the operating rod. The fan motor is turned on and off across the two switches by an overhang-like operating piece formed between the first and second switches and the first and second switches and integrally formed on the operating rod. The third switch is operated by the operating rod.

Action With this configuration, the first and second switches for the light bulb operate independently by the respective operating rods, and the third switch for the fan motor is formed integrally with the operating rod across the two switches. The overhang-shaped operating piece causes the third switch for the fan motor to be turned on only when both of the two operating rods are pushed in, and the other condition, that is, which one of the two operating rods is selected. When either one is protruding or both are protruding, it works to turn off the switch for the fan motor.

EXAMPLES An example of the present invention will be described below with reference to the drawings in FIGS.

In FIG. 4, reference numeral 15 is a case made of synthetic resin with an opening on the upper surface side. Reference numeral 16 is a cover case that covers the opening on the upper surface side of the case, and is formed with flanges 17a having hooking holes 17 at both ends.
The holes 17 are fitted and fixed in 8, 8 '. 19a, 19b
Has one end shaped like a cylinder and the other end shaped like a square prism.
A hole 2 formed in the front wall 15a of the case 15 by the second operating rod.
Cylindrical portions are inserted into 0a and 20b, respectively, and projections 22a and 22b that enter the grooves 21a and 21b provided in the case 15 are formed so that the operating rod is slidably attached.

23a and 23b are springs for urging the first and second operating rods 19a and 19b in a direction projecting from the case 15, respectively.
The first and second operating rods 19a, 19b are fixed in the case 15 by walls 25a, 25b provided in the cover case 16 inserted into holes 24a, 24b provided from the lower part toward the tip. . 26a and 26b are a first switch SW3 and a second switch SW4 for turning on and off the light bulb, respectively, which are arranged in parallel. The movable contact plates 26a and 26b of the first switch SW3 and the second switch SW4 have contacts 27a and 27b welded at one end and terminals formed at the other ends. Part of the terminal further has L-shaped bent portions 28a and 28b, and the groove portion 2 provided in the case 15
The bent portions 28a and 28b are fixed to 9a and 29b. Triangular operating piece 30 provided on the first and second operating rods 19a, 19b
The movable contact plates 26a and 26b are moved by a and 30b.

Further, the first and second operating rods 19a, 19b have integrally formed rectangular operating pieces 30c, 30d so as to straddle the first switch SW3 and the second switch SW4, respectively. The operating pieces 30c and 30d do not collide with each other.

The state of FIG. 1 shows a state in which the first operating rod 19a is inserted into the case 15 and the second operating rod 19b is projected outside the case 15 by the spring 24b. The movable contact plates 26a, 26b are springs. It is normally moved in the closing direction by force.

Reference numeral 31 denotes a movable contact plate of the third switch SW5 for the fan motor, and a tongue portion 32 formed by cutting out in the middle of a flat plate and this tongue portion.
It has a notch 33 parallel to 32 and a contact 34 on an extension of the tongue 32. Reference numeral 35 denotes a fixed contact terminal, which is a substantially L-shaped terminal for holding the movable plate 31, and a terminal portion 36,
It comprises a pair of bent cut-and-raised parts 37, 38, and the cut-and-raised parts 37, 38 have V-shaped grooves 34, 40. The ends 41 of the notch 33 of the movable plate 31 and the tip 32a of the notch forming the tongue 32 are fitted in the grooves 39 and 40, and the tip 32a of the tongue 32 is cut and raised 38. The groove 40 is brought into contact with the opposite side to the groove 40 and is held by the spring force. Reference numeral 42 denotes a holding spring for pushing and operating the movable plate 31, which is formed in a substantially L shape, is biased in the cover case 16 direction, and turns off the switch SW5 when pressed in the opposite cover case 16 direction. It has a V-groove-like protrusion 43 at one end and a bent portion 44 having an L-shaped notch 44a formed near the center. An acting portion 45 between the notch 33 and the notch in which the bent portion 44 forms the base portion 32 of the movable plate 31.
The terminal portion 36 of the terminal 35 and the end portion 46 of the pressing spring 42 are inserted and fixed in the groove 47 of the case 15 so as to press. 48 is the first switch SW3 for the two light bulbs,
It is a common fixed contact terminal corresponding to the movable contact plates 26a, 26b of the second switch SW4 and the movable contact plate 31 of the third switch SW5 for the fan motor, and has three fixed contact portions 49, 50, 51. ing.

That is, the contact portion formed by bending in parallel with the side wall of the case 15 so as to come into contact with the contact 27a of the first movable contact plate 26a.
49, a contact portion 50 formed by bending in parallel with the side wall of the case 15 so as to come into contact with the contact portion 27b of the second movable contact plate 26b,
And a contact portion 51 located above and abutting on the contact portion 34 of the third movable contact plate 31.

Further, the terminal portion 52 of the fixed contact terminal 48 is inserted and fixed in the groove 53 of the case 15.

Here, the overhang-shaped actuating pieces 30c, 30d of the first and second actuating rods 19a, 19b straddle the first and second switches SW3, SW4, and V of the presser spring 42 of the third switch SW5. The protrusions 43 are arranged at positions contacting and separating from both ends.

As shown in FIG. 1, the operating piece 30c contacts half of the projecting portion of the pressing spring 42 according to the protruding / withdrawing of the operating rod 19a, and switches the third switch, similarly to the protruding / withdrawing of the operating rod 19b. 30d
Is in contact with and separated from half of the protruding portion 43 of the presser spring 42, and is in a position where the third switch is switched.

Further, 54 is a terminal connected to the movable contact plate 26a of the first switch SW3, and 55 is a terminal connected to the movable contact plate 26b of the second switch SW4.

The operation of the refrigerator / freezer door switch configured as described above will be described below.

In FIG. 1, the movable contact plate 26a of the first switch and the movable contact plate 26b of the second switch for the two light bulbs can be independently turned on and off by the first and second operating rods 19a and 19b. . That is, the operating rod pieces 30a, 30b of the operating rods 19a, 19b and the movable contact plates 26a, 26b come into contact with and separate from each other when the operating rods 19a, 19b are immersed.
The second switches SW1 and SW2 turn on and turn off when protruding. The third switch SW5 for the fan motor at the center is when the operating rods 19a, 19b are depressed and 30c, 30d are in the most pushed state (position B), that is, the first and second operating rods 19a, 19b. Only when both 19b are pushed in, the contact between the operating pieces 30c, 30d and the projecting portion 43 of the presser spring 42 is released, and it is turned on by the urging of the presser spring 42.
When either operating rod 19a or 19b is protruding (position A
Is an overhanging actuating piece (30
c or 30d). ) Or both operating rods 19a, 19
When b is protruding, the protruding portion 43 is pressed by the operating pieces 30c, 30d of the operating rods 19a, 19b to move downward and push the movable contact plate 31 of the switch SW5 to turn it off.

Describing the circuit with reference to FIGS. 5 to 12, 54 is the first
The switch SW3 has a terminal connected to the movable contact plate 26a and is connected to the light bulb. Here, as shown in FIG. 9 to FIG.
When the operating rod 19a is pushed in, the refrigerator door is closed and the bulb is cut.

Further, 55 is a terminal connected to the movable contact plate 26b of the second switch SW4, which is also connected to the light bulb. When the second operating rod 19b is pushed in as shown in FIGS. 7 to 8, the second switch SW4 is turned off and the light bulb is turned off. A fixed contact terminal 35 is connected to the third switch SW5 and is connected to the fan.

As shown in Figs. 11 to 12, the light bulb is 2 only when both the first and second operating rods are pushed in, that is, when both doors of the refrigerator are closed.
Both turn off, the third switch SW5 turns on, and the fan rotates. In other states, the fan does not rotate. 48 is a common terminal of the three switches SW3, SW4, SW5.

As described above, according to this embodiment, the first switch SW3 that is switched by the first operating rod 19a and the second operating rod 19b,
The movable contact plate 31 of the switch SW3, which is located between the second switch SW4 and the switches SW3 and SW4 and is operated via the presser spring 42, extends over the switches SW1 and SW2 from the operating rods 19a and 19b. The protruding operating pieces 30c, 30d actuate in response to the protruding / withdrawing of the operating rod, and turn on only when both operating rods 19a, 19b are immersed, so the bulb can be turned on / off independently and either When the door is open, the fan motor is turned off to prevent the outflow of cold air, and the fan motor can be turned on only when both doors are closed. Also, SW3,
SW4 is reliably switched by the triangular actuating pieces 30a, 30b of the actuating rods 19a, 19b, and the switch SW5 presses the movable contact plate 31 via the presser spring 42 by the actuating pieces 30c, 30d. Reliable switching is possible.

EFFECTS OF THE INVENTION As described above, the present invention has the two first and second switches for independently turning on and off the light bulbs provided in each of the two chambers, and the operating piece for independently switching the switches. One operating rod, a third switch for turning on and off a fan motor for forcibly sending air to the two chambers, and an operating piece of the first and second operating rods across the two switches. ,
By turning on and off the third switch for the fan motor, when the doors of the freezer compartment and the refrigerator compartment are opened, the respective light bulbs are turned on, and when the doors are closed, the light bulbs are extinguished. Further, the fan motor rotates only when both doors of the freezer compartment and the refrigerator compartment are closed, and when either door is opened, the fan motor stops and wasteful cool air is not discharged to the outside.

Further, the configuration is simple and the switching of each switch can be performed reliably, and the contact of the switches is stable and reliable without being influenced by the other operating rod.

[Brief description of drawings]

FIG. 1 is a plan view of a refrigerator / freezer door switch according to an embodiment of the present invention with a cover case removed, and FIG.
Fig. 11 is an exploded perspective view of the third switch portion for the fan motor, Fig. 3 is a sectional view showing the assembled state of Fig. 2, and Fig. 4 is an exploded perspective view of the door switch for the refrigerator / freezer of Fig. 1. Figure,
FIG. 5 is a plan view showing a state where the operating rod of the door switch of the present invention is projected, FIG. 6 is an electric circuit diagram of FIG. 5, and FIG. 7 is a state when the second operating rod is retracted. FIG. 8 is a plan view, FIG. 8 is an electric circuit diagram of FIG. 7, FIG. 9 is a plan view showing a state in which the first operating rod is retracted, and FIG. 10 is an electric circuit diagram of FIG. 9 and FIG. Is a plan view showing a state in which the first and second operating rods are immersed, FIG. 12 is an electric circuit diagram of FIG. 11, and FIG. 13 is a general refrigerator / freezer of a light bulb, a fan motor, and a door switch. FIG. 14 is a schematic front view showing the relationship, and FIG. 14 is a plan view of a conventional door switch for a refrigerator / freezer with a cover case removed. 15 ... Case, 35 ... Fixed contact terminal, 26a ... First movable contact plate, 26b ... Second movable contact plate, SW3 ... First switch, SW4 ... Second switch, 31 ... ... 3rd movable contact plate, SW5 ... 3rd switch, 19a ... 1st operating rod,
19b ... Second operating rod, 30a, 30b ... Operating piece, 30c, 30d ...
… Operating piece, 42 …… Presser spring.

Claims (1)

[Claims] 1. A first operating rod (19a) and a second operating rod (1).
9b) is retractable and held in the case (15), and the case (1
5) is equipped with a first switch (SW3) and a second switch (SW4) for independently turning ON / OFF the two light bulbs (1) and (2), and the first switch (SW3) is movable. The contact plate (26a) is operated by the first operating rod (19a), the movable contact plate (26b) of the second switch (SW3) is operated by the second operating rod (19b), and 1 switch (SW3)
ON / OFF the fan motor between the second switch (SW4) and
A third switch (SW5) is arranged, and the third switch (SW5) has a movable contact plate (31) and a fixed contact terminal (35).
Has three fixed contact parts (49, 50, 51) that connect to and separate from the movable contact plates (26a, 26b, 31) of the three switches (SW3, SW4, SW5) to form contacts. And the fixed contact terminal (48), the first switch (SW3) and the second switch (SW4) are turned off when the operating rod is retracted, and are turned on when the operating rod is protruded, and the first operating rod (19a) is further provided. Also, the overhang-like actuating pieces (30c, 30d) extending over the first switch (SW3) and the second switch (SW4) from the second actuating rod (19b) are the third switch (SW5). The movable contact plate (31) is brought into contact with and separated from the movable contact plate (31) independently, so
Door switch for refrigerator / freezer characterized in that the third switch (SW5) is turned on only when both operating rods (19b) of (3) are immersed.