JP4117336B1 - Pull-out equipment - Google Patents

Abstract

【Task】
To improve the operability of a drawer-type device having a drawer door.
[Solution]
In a drawer-type device having a drawer door that can be pulled out in the front-rear direction, the drawer door is configured to be able to be pulled out in the front-rear direction by a rail, a drive mechanism having a rotation drive unit, and a control unit that controls the drive mechanism; A rotary member that is driven to rotate by the rotary drive unit and has a plurality of power transmission units provided at positions where the distance from the rotation center is gradually changed in the rotation direction, and power is transmitted from the power transmission unit. It has a connecting member for converting the rotational motion of the rotating member into a linear motion, and a closer that is a closing biasing means for pulling the rail in the closing direction.
[Selection] Figure 3

Description

  The present invention relates to a drawer-type device.

  Conventionally, as a device that automatically opens the refrigerator door, it has a short-distance operation section with a high gear ratio and a long-distance operation section with a low gear ratio, and generates a large force when peeling the packing, After that, it opens at high speed. The structure which provided the overload prevention clutch in the low gear part is disclosed (for example, refer patent document 1).

  Alternatively, a configuration is disclosed in which the pressing member is linearly moved by the worm gear and the rack, the drawer door is pushed out automatically by the pressing member to automatically open, and when the door has been opened, the return spring returns to the retracted position (for example, Patent Document 2).

  Alternatively, a timing belt is provided in a support frame that supports the drawer door, an automatic opening unit that slides on the timing belt is provided, and the automatic opening unit includes a slide pin that pushes the drawer case, and a roller that operates on the timing belt, The structure comprised by the drive means for driving a slide pin and a roller is disclosed (for example, refer patent document 3).

  Alternatively, it is provided at the output stage of the reduction gear using a worm gear, and the contact portion to the open / close door opens in an arc shape by projecting from the main body to the door side by rotating operation by energizing the drive motor for a certain time. A cam device having a flat plate shape is disclosed (for example, see Patent Document 4).

  Alternatively, the drive device is a cam device that includes a rotatable cam and opens the door by projecting the long diameter end face of the cam forward by rotating the cam via a drive device in response to a signal from a door opening switch. A cam device is disclosed in which the cam has a combined shape of an ellipse or an ellipse (see, for example, Patent Document 5).

  Alternatively, an electric motor having a cam on the output shaft is provided behind the drawer door, and the frame is pushed out by rotating the cam (see, for example, Patent Document 6).

Japanese Patent Laid-Open No. 02-157581 Japanese Patent Laid-Open No. 2001-280827 JP 2000-220957 A JP 2002-257466 A JP 2001-317864 A Japanese Utility Model Publication No. 1-167590

  In recent years, eating habits have changed, and daily foods are often purchased at nearby food stores and cooked, and food is purchased for a week at a suburban large supermarket, etc. Storage has become common. In response to the increase in the use of frozen foods, large refrigerators with a capacity exceeding 400 liters are generally spreading at home.

  However, the amount of food to be stored increases with the size of the refrigerator, and for example, food of 20 kg or more is stored in the freezer compartment or vegetable compartment, so that the force to open the doors of the vegetable compartment or freezer compartment becomes heavy. There is.

  In particular, at the beginning of the door opening, in addition to the load resistance of the drawer rail, the force to peel off the magnet packing adsorbed to the refrigerator body is added, so the opening force becomes particularly heavy. Opening the refrigerator is becoming a burden for weak people.

  In addition, in a refrigerator, if the door is closed inadequately, or if it is in a so-called half-door state, the cold air will go outside and the refrigeration function will be lost, and the electricity cost will be extra and an energy saving effect will be achieved. As well as reducing, the quality of the stored food is deteriorated, and the outside air outside the refrigerator penetrates into the refrigerator to cause condensation, and water droplets adhere to the inside of the refrigerator.

  Therefore, there is a refrigerator that can open the door lightly by reducing the opening force of the drawer door of the refrigerator, or a refrigerator that can automatically close the door from the so-called half-door state and improve the energy saving effect It has been demanded.

  An object of this invention is to improve the operativity of the drawer-type apparatus which has a drawer door.

In order to solve the above-described problems of the prior art, the pull-out device of the present invention is a pull-out device provided with a pull-out door that can be pulled out in the front-rear direction, and the pull-out door is configured to be pullable in the front-rear direction by a rail. A drive mechanism having a rotation drive unit, a control means for controlling the drive mechanism, and a plurality of powers at positions that are rotationally driven by the rotation drive unit and gradually change the distance from the rotation center in the rotation direction. A rotating member provided with a transmission portion; a connecting member for transmitting power from the power transmission portion to convert the rotational motion of the rotating member into a linear motion; and a closer that is a closing biasing means for pulling the rail in a closing direction. If, have a, the connecting member, that provided on the lower surface of the housing part which can be pulled out in the longitudinal direction together with the drawer door or the drawer door Pull-out device according to claim and. It was.

  The connecting member has a stepped portion having a plurality of steps, and the pulling-type device receives the power of the power transmission portion at the stepped portion.

  In addition, a switch for opening the drawer door is provided, and when the switch is operated, the control unit operates the rotation driving unit, and the power transmission unit located at the closest distance from the rotation center of the rotation member Power is transmitted to the first step of the connecting member, power is sequentially transmitted from the power transmission portion at the next closest distance from the rotation center of the rotating member to the second step of the connecting member, and from the power transmitting portion. After transmitting the power to the stepped portion, the connecting member is separated from the power transmitting portion, and the drawer door is opened.

  ADVANTAGE OF THE INVENTION According to this invention, the operativity of the drawer-type apparatus which has a drawer door can be improved.

  Embodiments of the present invention will be described below with reference to the drawings.

(Overall configuration of refrigerator)
FIG. 1 is a perspective view of a refrigerator according to the present invention, and FIG. 2 is a longitudinal sectional view. In FIG. 1 and FIG. 2, the refrigerator main body 1 is divided into a plurality of storage rooms, the uppermost part is a refrigerating room 2, and the door is a so-called French door that opens to the left and right sides as an example. The lower side of the refrigerator compartment 2 is a storage room divided into left and right, for example, one of which is a function switching room 3, and the other is an accumulator for taking out ice produced by an automatic ice making device (not shown). It is an ice making room 4.

  Furthermore, the lower part is a freezer compartment 5 provided with a drawer door that can be pulled out and opened to the front, and the lowermost stage is a vegetable compartment 6 provided with a drawer door. In addition, the structure by which the upper stage becomes the vegetable compartment 6 and the lower stage becomes the freezer compartment 5 may be sufficient.

  The refrigerator compartment door is provided with an operation display section 7, which is provided with an open switch 8 a for the freezer compartment and an open switch 8 b for the vegetable compartment. The user presses the switches 8 a and 8 b to instruct the opening operation of the drawer. It is the structure which can be done. Here, if the freezer compartment 5 is provided above the vegetable compartment 6, the open switch 8a for the freezer compartment is provided above the open switch 8b for the vegetable compartment and provided in the same manner as the positional relationship of the doors. It is preferable because it is easy to understand which open switch 8 should be operated when the user operates.

  Hereinafter, the door opening and closing apparatus will be described by taking the freezer compartment 5 as an example. The same applies to the vegetable compartment 6. The drawer door is constituted by the door body 5a of the freezer compartment 5, the slide rail 11, and the like, and a container 12 for storing food is placed on the drawer door and supported so as to be freely drawn out to the front. A closer 13 is provided on the back side of the slide rail 11 as a closing biasing means for pulling the freezer compartment 5 in the closing direction. When the freezer compartment 5 is once opened, the opening amount is, for example, 50 mm or less. Then, a force of pulling back is applied by a spring force (not shown), and the operation of closing the freezer compartment 5 is assisted to close the door until the magnet packing 14 provided on the entire circumference of the freezer compartment 5 adsorbs to the refrigerator body 1.

  A door opening / closing device 10 is provided inside the freezer compartment 5. The door opening / closing device 10 is fixed to the refrigerator main body 1 side, and is provided with a rotation drive means (hereinafter referred to as “drive mechanism 15”) provided with a motor as a drive source and a speed reduction mechanism that decelerates the rotation of the motor. A rotating plate 19 as a rotating member provided on the rotation output shaft side of the mechanism 15 and rotated, and a plurality of power transmission portions are provided at positions where the distance from the rotation center is gradually changed toward the rotation direction; It is opened and closed together with the door 5a of the freezer compartment 5, and in this embodiment, a connection provided on the lower surface of the drawer door (the lower surface of the member connecting the rear of the slide rail 11) or the lower surface of the container 12 placed on the drawer door. A connecting plate 16 as a member is provided. The freezing chamber is configured such that the rotational force of the rotating plate 19 provided on the output shaft of the drive mechanism 15 is applied to the connecting plate 16 so as to convert the moving direction of the slide rail 11, that is, the rotational motion into a linear motion. 5 is configured to open and close. A door detection 17 is provided on the front side of the freezer compartment 5 and the freezer compartment 5 is closed, or the open amount of the freezer compartment 5 is, for example, a predetermined amount of about 30 mm (a closing drive amount described later). It is detected whether or not the opening amount is within 35), and the signal is sent to a control circuit to be described later.

  Next, the structure of the door opening / closing apparatus 10 provided with the drive mechanism 15 and the connecting plate 16 will be described in detail with reference to FIGS. Here, the door opening and closing device 10 will be described below as being provided in the freezer compartment 5, but the same applies to the vegetable compartment 6.

  FIG. 3 is a plan view of the door opening / closing device 10 including the drive mechanism 15 and the connecting plate 16 as viewed from above in FIG. 4 and 5 are perspective views showing an example of the internal configuration of the drive mechanism 15. FIG.

  In the drive mechanism 15, a rotary member (hereinafter referred to as “rotary plate 19”) is rotatably supported around a drive shaft 18 that is a rotation output shaft, and the rotary plate 19 has a drive pin 20 that is a power transmission unit. Is provided. In this embodiment, three drive pins 20 are provided, and according to the distance from the drive shaft 18, the first drive pin 20a is at a distance r1, the second drive pin 20b is at a distance r2, and the third is at a distance r3. The drive pins 20 c are provided, each drive pin 20 has a cylindrical shape, and the center axis of the drive pin 20 is parallel to the rotation center axis of the drive shaft 18. Here, it is assumed that r1 <r2 <r3. That is, as shown in FIG. 3, the diameter from the rotation center gradually increases greatly in the rotation direction opposite to the positive rotation direction of the rotation plate 19 (the rotation direction of the rotation plate 19 when the drawer is pulled out). The rotating plate 19 is provided with a power transmission unit composed of a plurality of drive pins.

  In the present embodiment, the rotating plate 19 rotates in the direction of the arrow CCW when the freezer compartment 5 is opened.

  Since the connecting plate 16 is provided on the drawer door or the like of the freezer compartment 5 as described above, the connecting plate 16 is movable along the slide rail 11 in the arrow opening direction 23. In FIG. 3, the left direction in the figure is the front side of the refrigerator, and the freezer compartment 5 is opened when the connecting plate 16 moves leftward.

  The connecting plate 16 has a stepped portion having a plurality of steps, and the first receiving surface 21a and the second receiving surface 21a at the first step contacted with the first drive pin 20a when the freezer compartment 5 is opened. The second receiving surface 21b at the second step with which the driving pin 20b is in contact and the third receiving surface 21c at the third step with which the third driving pin 20c is in contact are provided. A detailed description of the operation of the drive pin 20 and the receiving surface 21 will be described later.

  4 and 5, a motor pinion 25 is provided on the rotating shaft of the motor 24 and meshes with the idler 26 to be decelerated. The idler 26 and the idler pinion 27 rotate as a unit, and the idler pinion 27 meshes with the idler 28. The idler 28 and the idler pinion 29 rotate as a unit, and the idler pinion 29 meshes with the drive gear 30 and is decelerated. The drive shaft 18 and the drive gear 30 are connected to each other, and the rotational speed of the motor 24 is reduced to about 1/100, for example, by this gear configuration, and the rotary plate 19 provided on the drive shaft 18 is rotated. A device that rotationally drives the rotating plate in this way is collectively referred to as a rotational driving means. The rotation driving means is fixedly installed at the bottom of the freezer compartment 5 and the vegetable compartment 6. In the present embodiment, a torque limiting means 31 is provided between the idler 28 and the idler pinion 29, and when an excessive external force is applied to the rotating plate 19, the torque limiting means 31 is interposed and the idler 28 and the idler are interposed. Since the pinion 29 slides on each other, the drive mechanism 15 can be prevented from being damaged. Further, the drive shaft 18 is provided with a rotation detection means 32 so that the rotational position of the drive shaft 18 can be detected. An example of such rotation detection means 32 is a variable resistor whose resistance value changes with the rotation of the shaft.

  Next, the detail of the operation | movement at the time of opening the freezer compartment door 5 with the door opening / closing apparatus 10 by this invention is demonstrated using FIG. FIG. 6 is a view showing an operation when the door opening and closing apparatus 10 according to the present invention opens the freezer compartment 5, and (a) shows a state where the freezer compartment 5 is closed as in FIG. b) The operation | movement which open | releases the freezer compartment 5 by operating in order of (c) (d) (e) is shown. The rotating plate 19 is rotatable around the drive shaft 18, the connecting plate 16 is supported so as to be movable in the horizontal direction in the figure, and the connecting plate 16 is provided in the freezer compartment 5. The leftward movement indicates the opening operation of the freezer compartment 5. Here, a reference line indicating the position of the illustrated left end of the connecting plate 16 in a state where the freezer compartment 5 is closed is represented as a drawing position 34.

  In the state of (b), the rotating plate 19 rotates in the direction of the arrow CCW, the first drive pin 20a comes into contact with the first receiving surface 21a, and a force in the direction of the arrow 23a is generated with respect to the connecting plate 16. At this time, since the first drive pin 20a is located at the distance r1 shown in FIG. 3 from the drive shaft 18, the force transmitted from the first drive pin 20a to the connecting plate 16 is the torque applied to the drive shaft 18. If T, then T / r1. This force is set to be larger than the resultant force of the force that peels off the magnet packing in the freezer compartment 5, the pull-in force of the closer 13, and the force that accelerates the weight of the freezer compartment 5 and the mass of the stored food. Thus, the adsorption of the magnet packing is peeled off, and the connecting plate 16 moves in the left direction in the figure together with the freezer compartment 5, and the freezer compartment 5 starts to open.

  Further, in the state (c) in which the rotating plate 19 is rotated in the CCW direction, the second driving pin 20b is in contact with the second receiving surface 21b, and the first driving pin 20a is separated from the first receiving surface 21a. To do. That is, the second drive pin 20b is located at a distance r2 shown in FIG. 3 from the drive shaft 18 and r2> r1, and the second drive pin 20b is more than the first drive pin 20a. Since the distance from the drive shaft 18, which is the center of rotation, is longer, the peripheral speed of rotation is faster. For this reason, after the second drive pin 20b comes into contact with the second receiving surface 21b, the first drive pin 20a is separated from the first receiving surface 21a. In this state, the second drive pin 20b is in contact with the second receiving surface 21b and applies a force indicated by an arrow 23b. At this time, since the second drive pin 20b is located at the distance r2 shown in FIG. 3 from the drive shaft 18, the force transmitted from the second drive pin 20b to the connecting plate 16 via the second receiving surface 21b. Is T / r 2, where T is the torque applied to the drive shaft 18. This force is smaller than the force applied to the connecting plate 16 by the first drive pin 20a in the direction of the arrow 23a in the state of FIG. 6B, but the magnet packing has already been peeled off. The applied force may be set so as to be larger than the resultant force of the pull-in force by the closer 13 and the force of further accelerating the weight of the freezer compartment 5 and the weight of the stored food. Moving to the left direction, the opening operation of the freezer compartment 5 is continued.

  Further, in the state (d) in which the rotating plate 19 is rotated in the CCW direction, the third driving pin 20c is in contact with the third receiving surface 21c, and the second driving pin 20b is separated from the second receiving surface 21b. To do. That is, the third drive pin 20c is located at the distance r3 shown in FIG. 3 from the drive shaft 18 and r3> r2, and the third drive pin 20c is more than the second drive pin 20b. Since the distance from the drive shaft 18, which is the center of rotation, is longer, the peripheral speed of rotation is faster. Therefore, after the third drive pin 20c comes into contact with the third receiving surface 21c, the second drive pin 20b separates from the second receiving surface 21b. In this state, the third drive pin 20c is in contact with the third receiving surface 21c and applies a force indicated by an arrow 23c. At this time, since the third drive pin 20c is located at the distance r3 shown in FIG. 3 from the drive shaft 18, the force transmitted from the third drive pin 20c to the connecting plate 16 via the third receiving surface 21c. Is T / r3, where T is the torque applied to the drive shaft 18. This force is even smaller than the force applied to the connecting plate 16 by the second drive pin 20b in the direction of the arrow 23b in the state of FIG. 6C, but the freezer compartment 5 has already been opened and the arrow 23c has been opened. Therefore, the freezer compartment 5 has a momentum corresponding to its own weight and speed including the container and the stored food, and the third receiving of the connecting plate 16 from the momentum and the third drive pin 20c. The opening operation can be further continued against the pulling force by the closer 13 by the force transmitted to the surface 21c.

  Further, in the state (e) in which the rotating plate 19 is rotated in the CCW direction, the third drive pin 20c is substantially separated from the third receiving surface 21c. The range of the movement amount 33 of the connecting plate 16 from the state of FIG. 6A to the state of FIG. 6E is an open drive range in which the connecting plate 16 receives a force from the drive pin 20. become. Here, it is preferable that the amount of movement 33 of the connecting plate 16 is set to be larger than the closing urging range that is the amount of drawing by the closer 13. That is, if the retracting stroke by the closer which is the closing urging range is 40 mm and the moving amount 33 of the connecting plate 16 is 50 mm, the connecting plate 16 stops at the position shown in FIG. This is because even if the chamber 5 is stopped, the freezing chamber 5 just opened by the closing force of the closer 13 is not closed. However, when the freezer compartment 5 is opened more than the state of FIG. 6 (e) and the connecting plate 16 moves to the left in the figure, the connecting plate 16 does not receive the driving force from the drive pin 20, but the freezer compartment 5 Has a speed in the direction of the arrow 23d, so the opening operation is continued until it is gradually decelerated by the friction load of the slide rail 11 and stopped. Since it operates in this way, the opening amount of the freezer compartment 5 becomes larger than the moving amount 33 of the connecting plate 16.

  As described above, the driving force in the opening direction is not continuously applied during the opening operation of the freezer compartment 5, but the driving force is applied only in a short range at the beginning of opening, and thereafter, the moving speed obtained in the driving force range slides. Since the operation to stop while gradually decelerating by the frictional force of the rail can be realized, even if the freezer compartment 5 hits when the user is standing just before the door or when an object is placed, the opening direction It is safe because no driving force is applied.

  As described above, when the freezer compartment 5 starts to be opened from the closed state, the first drive pin 20a disposed closest to the drive shaft 18 pushes and drives the connecting plate 16 to drive at a low speed. The magnet packing is peeled off by applying a large force, and the second drive pin 20b provided further away from the first drive pin 20a pushes the connecting plate 16 to generate a medium force at a medium speed. By driving, the freezing chamber 5 is accelerated against the pulling force of the closer 13 to accelerate the freezing chamber 5, and subsequently a third drive provided farther from the drive shaft 18 than the second drive pin 20b. The pin 20c pushes out the connecting plate 16, and although the force is small, the freezer compartment 5 can be further accelerated by being driven at a high speed, which is convenient for reliably performing the opening operation of the freezer compartment 5.

  In the configuration of the present invention, the position where the driving pin 20 contacts the connecting plate 16 and applies the driving force is substantially perpendicular to the opening direction 23 of the freezer compartment 5 when viewed from the driving shaft 18. Is proportional to the rotational speed of the rotating plate 19 and the length of the arm up to the drive pin 20. As a result, it is easy to increase the speed at which the door is pushed out by using a rotating cam in the prior art as compared with a configuration in which the door is pushed only by the change in radius to the contact point between the cam and the door. With such a configuration, it is possible to realize an operation in which a driving force is applied only in a short range at which the opening starts, and thereafter the opening speed obtained in the driving force range is gradually decelerated by the frictional force of the slide rail and stopped. Therefore, it is preferable.

  After the freezer compartment 5 is opened by the above operation, the rotating plate 19 further continues to rotate in the CCW direction, reaches the state of FIG. 6A and stops rotating. Needless to say, in this case, the connecting plate 16 is not at the position shown in FIG. 6A, and the freezer compartment 5 is open, so that it is moved to the left in the figure.

  As described above, in the door opening and closing apparatus according to the present invention, after the rotating plate 19 performs the opening operation of the freezer compartment 5 and then continues to rotate in the same direction and rotates once, the freezer compartment 5 is closed. Since it is possible to return to the state, that is, the origin range, it is convenient to return to the origin range at high speed. If the rotating plate 19 is not configured to rotate in one direction but opens the freezer compartment 5 and then stops once, rotates in the opposite direction and then returns to the origin range, the present invention. It is clear that it takes an extra time to return to the origin range as compared with the rotation in one direction.

  The opening amount when the door of the freezer compartment 5 is opened by the door opening / closing mechanism of the present invention will be described.

  FIG. 14 is a diagram for explaining the relationship between the speed of the freezer compartment and the opening amount when the freezer compartment 5 is opened, and the freezer compartment within the range of the movement amount 33 by the opening operation of the freezer compartment 5 described in FIG. The door 5 is opened by the door opening / closing device 10 by applying a force in the opening direction from the drive pin 20 through the receiving surface 21. Here, since the freezer compartment 5 has the speed V when it is opened by the movement amount 33 (5 '), it continues to open due to inertia, and during the inertia opening amount 74, it gradually decelerates without driving force and finally reaches the maximum. Open to stop position 73 (5 ″) and stop.

Here, if the total mass of the freezer compartment 5 including the contained food is m, the kinetic energy E at the position of the movement amount 33 is E = (m × V × V) / 2 (Formula 1)
It is.

Here, if the friction coefficient of the slide rail 11 is μ and the gravitational acceleration is g, the frictional force F generated by the slide rail 11 is F = μ × m × g (Formula 2)
It becomes. The energy E2 consumed by the frictional force corresponds to the product of the frictional force F and the distance L moved while receiving the friction, that is, the inertia opening amount 74.
E2 = L × F = L × μ × m × g (Formula 3)
Here, if all of the kinetic energy that the freezer originally had was consumed by friction before stopping, E = E2,
(M × V × V) / 2 = L × μ × m × g (Formula 4)
Divide both sides by m (V × V) / 2 = L × μ × g (Formula 5)
Therefore, the inertia opening amount 74 (that is, L) deforms (Equation 5) and L = (V × V) / (2 × μ × g) (Equation 6)
Represented as: That is, according to Equation 6, the inertia opening amount 74 (that is, L) is independent of the mass m of the freezer compartment 5, and the friction coefficient μ of the slide rail and the speed V at the time of movement 33, that is, the drive pin 20 and the receiving surface 21. It can be seen that the driving force in the opening direction transmitted from the rotating plate 19 to the connecting plate 16 disappears and depends only on the speed at which the opening starts due to inertia.

  Here, the mass m of the freezer compartment 5 is of course different depending on the amount of food stored, but the maximum opening 73 of the freezer compartment 5 when the freezer compartment is opened electrically is almost constant regardless of the amount of food. Is desirable. That is, since the frictional resistance μ of the slide rail 11 is a constant value determined by the slide rail 11, it is desirable to reduce the fluctuation of the speed V due to the amount of food in order to make the maximum opening 73 substantially constant. Therefore, it is desirable that the reduction ratio of the drive mechanism 15 be sufficiently large to reduce the fluctuation of the load torque applied to the motor 24 to reduce the fluctuation of the rotational speed. For example, the reduction ratio is set to 1/100 or more. desirable. By increasing the reduction ratio, the output torque by the motor 24 has a margin, so that the fluctuation of the rotational speed of the motor 24 due to the amount of food can be reduced, and the maximum opening amount 73 due to the amount of food can be reduced. This is preferable because the fluctuation can be reduced.

  The speed V when the freezer compartment 5 is opened by the moving amount 33 and moved by inertia is the speed at which the third drive pin 20c moves in the opening direction 23d as described with reference to FIG. It is proportional to the rotational speed of the plate 19 and proportional to the radius of rotation r3 which is the distance between the contact 75c between the third drive pin 20c and the third receiving surface 21c and the rotation center of the drive shaft 18. Here, as shown in FIGS. 6C to 6D, the position of the contact 75c (75d in FIG. 6E) opens when the drive shaft 18 that is the center of rotation is used as a reference. The third drive pin 20c rotates around the drive shaft 18 at a speed that the connecting plate 16 moves in the opening direction 23 because it is located in the upper part of the figure, which is a direction substantially orthogonal to the direction 23. It becomes substantially equal to the circumferential speed which is the speed in the circumferential direction.

  Next, in order to compare with the configuration described above, the opening speed in a configuration using a conventionally known cam will be described with reference to FIG. In FIG. 13, a cam 76 is pivotally supported around a rotation center 77 in a rotation direction 80 and has a flat plate shape with an outer periphery 78 of the cam being eccentric. A cam receiving plate 79 is provided in contact with the outer periphery 78 of the cam 76, and the cam receiving plate 79 is provided in the freezer compartment 5, and the cam receiving plate 79 rotates in the direction of the arrow 81 when the cam 76 rotates in the rotation direction 80. The freezer compartment 5 opens together with the cam receiving plate 79 to the left in the figure. At this time, when the cam 76 is at a position 76 ′ indicated by a broken line, the cam receiving plate 79 ′ is in contact with the contact 86. When the peripheral speed to the contact 86 at this time is represented by an arrow 83, the speed at which the cam receiving plate 79 'moves in the opening direction on the left side of the figure is the opening speed 84 that is a projection component of the peripheral speed 83 in the opening direction. However, the cam 76 and the cam receiving plate 79 slip due to the slip speed 85 corresponding to the projection component in the direction orthogonal to the opening direction. In this way, the speed in the opening direction in the case of the configuration using the cam is only a change in the radius of the contact point between the cam 76 and the cam receiving plate 79 generated by the rotation of the cam 76. Is less than the peripheral speed of the cam 76, and slip occurs between the cam 76 and the cam receiving plate 79, so that the cam 76 and the cam receiving plate 79 are worn and rubbed. Problems are likely to occur.

  Furthermore, in the structure using the cam shown in FIG. 13, it is a function only to push the door to the left, and there is no function to close the door.

  When the freezer compartment 5 is closed, the freezer compartment 5 is not closed until the magnet packing 14 is adsorbed for some reason, and a so-called half-door state is created in which a gap is formed between the magnet packing 14 and the refrigerator body 1. There is. The operation of the door opening and closing device 10 when the door is in the half door state will be described with reference to FIG.

  FIG. 7 is a view showing the operation when the door opening and closing device 10 according to the present invention closes the freezer compartment 5, and FIG. 7A shows that the freezer compartment 5 is not closed, and the left end of the connecting plate 16 is shown in the drawing position 34. In other words, it is shown that the valve is moved by the opening amount 35 that is the closing drive range in which the closing operation can be performed. If the freezer 5 is provided with a closer 13, the freezer is usually pulled in and closed by the pulling force generated by the closer 13, but a part of the food is caught or slides for some reason. There are rare cases where the operation of the rail 11 is temporarily awkward and cannot be pulled in.

  Here, when the rotary plate 19 is rotated around the drive shaft 18 in the direction of the arrow CW, the third drive pin 20c comes into contact with the return surface 22 on the left side in the figure facing the receiving surface 21 of the connecting plate 16. FIG. 7B shows a state in which the rotating plate 19 is further rotated in the direction of arrow CW, but the connecting plate 16 is pushed and moved in the direction of arrow 36 by the third drive pin 20c, so that the connecting plate 16 The left end of the figure moves to the retracted position 34. The position shown in FIG. 7B indicates that the freezer compartment 5 is completely closed until the magnet packing 14 is attracted to the refrigerator body 1.

  Thereafter, the rotating plate 19 rotates in the direction of the arrow CCW to the state shown in FIG. 7C, and rotates to a position similar to that shown in FIG. 3 and stops.

  By operating as described above, even if the freezer compartment 5 is not completely closed and is in a so-called half-door state, by rotating the rotating plate 19 in the opposite direction to when the freezer compartment 5 is opened, Since it can close by applying the force of the direction which closes the freezer compartment 5 with respect to the connection plate 16, a half door can be prevented and it is suitable.

  As described above, the force for opening the freezer compartment 5 needs to be more than the total of the force for peeling the magnet packing 14 and the pulling force by the closer 13, but when closing the magnet packing 14 is pulled. Since the peeling force is unnecessary and the pulling force by the closer 13 is generated, the closing force applied by the door opening and closing device 10 according to the present invention is sufficient as a weak force compared to the opening force. According to the present embodiment, when the freezer compartment 5 is closed, the third drive pin 20c farthest from the drive shaft 18 pushes the return surface 22 of the connecting plate 16, so that the drive torque applied to the drive shaft 18 is increased. Even if the opening force is the same as that at the time of opening, the closing force is preferably smaller by r1 / r3 than the opening force. Furthermore, even if a finger or the like is sandwiched between the freezer compartment 5 and the refrigerator main body 1, the force to be sandwiched is small and the safety is high.

  Furthermore, it is safer to perform the closing operation slowly at a lower closing speed. Therefore, it is desirable to make the closing operation slower than the opening operation of the freezer compartment 5.

  Here, the closing drive range that is the opening amount 35 that can close the freezer compartment 5 will be described with reference to FIG. 2. The opening amount 35 is the door thickness that is the thickness of the door body 5 a that forms the front surface of the freezer compartment 5. It is desirable to make it smaller than 71. This is because if the opening amount 35 is larger than the door thickness 71, a finger or the like is put in the inter-door gap 72 generated between the freezer compartment 5 and the vegetable compartment 6 or the switching chamber 3 door when the freezer compartment 5 is started to be retracted. Although there is a risk of being pinched, if the opening amount 35 is set to be smaller than the door thickness 71, there is no possibility of fingers being pinched, so that safety is further enhanced.

  Next, a suitable position of the rotating plate 19 when the freezer compartment 5 is closed will be described with reference to FIG. In FIG. 8, the connecting plate 16 shown by a solid line is in a position where the left end in the drawing matches the drawing position 34 and the freezer compartment 5 is closed. Even if the refrigerator is provided with the door opening and closing device 10 as in the present invention, the user may pull out the freezer compartment 5 for some reason. Alternatively, when the door opening / closing device 10 does not operate due to a failure, it is desirable that the user can manually open and close it freely. When opening and closing manually as described above, the door opening and closing device 10 desirably has a configuration that does not obstruct a manual operation by the user when the freezer compartment 5 is opened or closed, or a phenomenon that the operation becomes heavy.

  If the user manually pulls out and opens the freezer compartment 5 from the state in which the freezer compartment 5 is closed, the connecting plate 16 provided in the freezer compartment 5 moves to the left side in the figure and becomes the position of the broken line. In the position of the broken line, each symbol is indicated by adding '. Here, the rotary plate 19 is in the position indicated by the solid line in FIG. 8, and the second tip 37b, which is the tip of the second receiving surface 21b provided on the connecting plate 16 at that position, and the first drive pin 20a. If there is a positional relationship in which the second tip 37b and the first drive pin 20a do not come into contact with each other when the connecting plate 16 moves to the left in the drawing, the user manually enters the freezer compartment. Since the connecting plate 16 and the drive pin 20 are not in contact with each other when the 5 is pulled out, the freezer compartment 5 can be freely pulled out and opened.

  Next, the rotary plate 19 is located at a broken line position 19 ', and there is a gap 39 between the first tip 37a provided on the connecting plate 16 and the third drive pin 20c at that position. If the first tip 37a and the third drive pin 20c 'are in a positional relationship that does not come into contact with each other when moving to the left in the figure, when the user manually pulls out the freezer compartment 5, the connecting plate 16 and the drive pin 20 Can be freely pulled out and opened.

  As described above, when the user manually opens and closes the freezer compartment 5, the connection plate 16 and the drive pin 20 do not come into contact with each other so that the line connecting the drive shaft 18 and the first drive pin 20a is the origin. It suffices to be within the angle range of the range 40. Therefore, when the freezer compartment 5 is closed, it is desirable to set the rotating plate 19 to be within the above-described origin range 40, and it is convenient to use when manually opening and closing.

  Such an angle range of the rotating plate 19 is referred to as being in the origin range in the present invention.

  Next, the configuration of a control system for controlling the door opening and closing device 10 will be described with reference to FIG. FIG. 9 is a block diagram showing the configuration of the control system.

  The operation display unit 7 provided with the open switch 8 sends a signal to the control circuit 41 which is a control means when the user presses the open switch 8. The motor 24 of the drive mechanism 15 provided in the freezer compartment 5 and the vegetable compartment 6, the rotation detection means 32 for detecting the rotational position of the drive shaft 18, and the door detection 17 for detecting the open / closed state of the door are control circuits. 41 is connected to control the drive mechanism 15.

  Reference numeral 92 denotes a switch body of an open switch that is operated by a user provided on the door body 5a of the freezer compartment 5 or the door body 6a of the vegetable compartment 6, and will be described in detail later.

  Electric power necessary for driving the door opening / closing device 10 and the control circuit 41 is supplied from a power source 42.

  As an example, the rotation detection means 32 may be a variable resistor whose resistance value changes with rotation of the shaft, or may be detection means such as a microswitch for detecting a predetermined rotation position of the shaft.

  The door detection 17 detects the first door detection for detecting whether or not the door of the freezer compartment 5 is completely closed, and detects whether or not the opening amount of the freezer compartment 5 door is a predetermined opening amount 35 or less. For example, a magnet provided in the door and a hall element provided in the refrigerator main body 1 may be used, or a detecting means such as a microswitch may be used.

  The operation display unit 7 may be provided with notification means 70 for notifying the user that the door is in a half-door state. An example of the notification means 70 sounds a buzzer or lights or blinks a lamp.

  The procedure of opening control when opening the freezer compartment 5 will be described with reference to FIG. FIG. 10 is a flowchart showing a procedure for opening control when the freezer compartment 5 is opened.

  When the opening operation is started (block 43), the control circuit 41 monitors the state of the rotation detecting means 32 and detects whether or not the rotating plate 19 of the drive mechanism 15 is in the origin range 40 where the operation starts (block). 44). Here, the origin range 40 is a state in which the connecting plate 16 does not interfere with the drive pin 20 even when the freezer compartment 5 is manually opened and closed as described with reference to FIG. Say.

  If the rotating plate 19 is not in the origin range 40, the motor 24 is energized (block 45) to rotate the rotating plate 19 so that the origin range 40 is reached. Whether the motor 24 is rotated in the CW direction or the CCW direction is determined by a control circuit that determines in which direction the connecting plate 16 is displaced with respect to the origin range 40 by a signal from the rotation detecting means 32. 41 determines and determines the direction in which the drive voltage is applied to the motor 24.

  When the control circuit 41 detects that the rotary plate 19 is in the origin range 40 and the user has operated the open switch 8 or the open switch 92, the control circuit 41 energizes the motor 24 (block 47). Then, the rotating plate 19 is rotated. The rotating direction of the rotating plate 19 at this time is the arrow CCW direction in FIG. 3, and when the rotating plate 19 rotates, the connecting plate 16 is pushed by the drive pin 20 as described in FIG. 5 opens. That is, power is transmitted to the first receiving surface 21 a of the connecting plate 16 from the first drive pin 20 a that is a power transmission portion located at the closest distance from the rotation center of the rotation plate 19, and then from the rotation center of the rotation plate 19. The second drive pin 20b that is the next closest distance transmits power to the second receiving surface 21b of the connecting plate 16, and then the third drive pin 20c that is the farthest from the center of rotation is connected to the connecting plate 16. After transmitting the power to the third receiving surface 21c, the connecting plate 16 moves away from the rotating plate 19 which is a power transmitting portion, and opens the drawer door. Thereafter, when the motor 24 continues to rotate and it is confirmed that the rotational position of the rotating plate 19 detected by the rotation detecting means 32 has entered the origin range 40 (block 48), the motor is stopped (block 49). The series of opening operations is terminated (block 50). As a result, even when the drawer door is manually closed, the rotating plate has been rotated to the rotating position where the rotating plate 19 does not interfere with the connecting plate 16.

(How to apply voltage)
Here, how to apply a voltage when energizing the motor (block 47) and starting to open the freezer compartment 5 will be described. If the rated voltage is applied steeply when the motor is energized, an inrush current flows through the motor coil, and the motor begins to rotate rapidly from a stopped state with a maximum output torque. Therefore, when the freezer compartment 5 starts to open, maximum acceleration is performed, and the opening operation starts sharply and vigorously.

  Therefore, when the motor 24 is energized (block 47), the rated voltage is not suddenly applied, but at the beginning of energization, for example, a low voltage of about 1/2 of the rated voltage is applied, and the door opening and closing device 10 starts driving. Thereafter, as the freezer compartment 5 is opened, the voltage is gradually increased, and in the opening operation shown in FIG. 6, the opening direction is transmitted from the drive pin 20 to the connecting plate 16 in the states (c) to (d). It is desirable that energization is performed to change the voltage up to the rated voltage by increasing the voltage continuously or intermittently until the speed to 23 is maximized. By gradually increasing the voltage in such a manner, the operation when the freezer compartment 5 starts to open becomes slow, so that it is not opened vigorously, and a high-class feeling can be given to the way of opening.

  Furthermore, after passing through the state of FIG. 6 (e), the rotating plate 19 continues to rotate in the direction of the arrow CCW and then stops after rotating to the position shown in FIG. 6 (a). After the freezer compartment 5 is opened, the rotating plate 19 is idled without being loaded. Therefore, after passing the state of FIG. 6 (e), the voltage applied to the motor 24 may be made lower than the rated voltage, and the rotational speed of the motor 24 may be made low. By reducing the rotation of the motor 24 as described above, there is an effect that noise and vibration generated from the motor 24 can be reduced and a quiet operation can be realized. Further, it is desirable to reliably stop the rotating plate 19 within the origin range 40 described with reference to FIG. 8. However, since the motor 24 does not go too far when stopped by rotating at a low speed, the stopping accuracy is improved, which is preferable. .

(Switch configuration)
Next, an example of the configuration of the switch when the user gives an opening instruction to the opening / closing mechanism according to the present invention will be described. FIG. 15 is a partial cross-sectional view of a refrigerator provided with a door opening / closing mechanism according to the present invention, and FIG. 16 is an enlarged view of an S portion shown in FIG. S part has shown the vicinity of the frame 87 by the side of the refrigerator main body 1 which contact | abuts the door 5a which comprises the front surface of the freezer compartment 5, and the door when the door is closed.

  A push button 88 is provided at the upper end of the door body 5a and protrudes from the door body 5a. A push rod 89 is provided on the back side of the push button 88, and the push button 88 and the push rod 89 are slidably supported through the door body 5a. The push button 88 and the push rod 89 are given a leftward force in FIG. 16A due to the return force generated by the return sprink 90 and are held in position by a stopper (not shown).

  A switch body 92 such as a micro switch is provided on the side of the frame body 87 that is in contact with the door body 5 a, and a wiring 94 extending from the switch body 92 to the control circuit 41 is provided inside the frame body 87.

  When the user pushes the push button 88 by hand, as shown in FIG. 16B, the push button 88 and the push rod 89 can be moved to the right side by the push amount 91 as shown in FIG. By pressing the plunger 93 provided on the switch body 92, a contact (not shown) provided in the switch body 92 is closed, and a signal indicating that the user has pressed the push button 88 can be transmitted to the control circuit 41.

  When the user releases his / her hand from the push button 88, the push button 88 and the push bar 89 are moved to the left side in the figure by the leftward force generated by the return spring 90, so that the state shown in FIG. Returning, the plunger 93 returns and the contact inside the switch body 92 returns to the open state.

  With this configuration, the switch main body 92 and the wiring connecting the switch main body 92 to the control circuit 41 can be provided only within the frame body 87 on the main body side. There is an effect that it is not necessary to provide.

  If the switch body 92 is provided on the door body 5a unlike the above configuration, the wiring 94 must be routed from the door body 5a to the refrigerator body 1 and connected to the control circuit 41, but the door body 5a is opened and closed as a drawer. Therefore, when the freezer compartment 5 is closed, the wiring 94 needs to be in a sagging state with an extra length greater than the maximum opening of the freezer compartment 5. In this configuration, when the freezer compartment 5 is pulled out, it is necessary to pull out the slack wiring 94 together. However, the wiring 94 may be tangled or caught by something when opening and closing.

  Further, when viewed from the user, when the push button 88 is pushed, a force in a direction to close the freezer compartment 5 to the back side is applied. If the user presses the push button 88 and the motor 24 is energized from the control circuit 41 and the freezer compartment 5 is electrically operated to open in the opening direction 23, the freezer compartment 5 is immediately opened by the user. Starts to open in the direction opposite to the direction in which the force is applied, that is, toward the user's side, so it feels unnatural for the user.

  On the other hand, when the user presses the push button 88, the motor 24 is not energized, and when the user releases the hand from the push button 88 once pressed, the motor 24 is energized. Since the freezer compartment 5 opens to the front in conjunction with the action of pulling the hand away from 88, the direction of movement of the user's hand and the direction of movement (opening) of the freezer compartment 5 are the same. There is an effect that there is no sense of incongruity to the operation from the viewpoint of a person and a natural operation feeling can be obtained.

  In such an operation, the motor 24 is energized at the timing when the control circuit 41 detects that the user releases the push button 88 and the contact in the switch main body 92 returns to the open state, and the freezer compartment 5 is energized. Can be realized if it is an electric opening operation.

(Close control)
The control procedure when closing the freezer compartment 5 from a so-called half-door state in which the freezer compartment 5 is not completely closed will be described with reference to FIG. FIG. 11 is a flowchart showing the procedure of closing control when closing the freezer compartment 5. The operation from the start of operation (block 51) to the energization of the motor 24 (block 53) until the origin range is detected (block 52) is the same as block 43 to block 45 in FIG.

  If the first door detection 17a of the door detection 17 detects the door of the freezer compartment 5, it can be confirmed that the freezer compartment 5 is not in a half-door state but closed, and thus the door closing operation is completed ( Block 55). The first door detection 17a cannot detect the closing of the door, and the second door detection 17b has an opening amount of the door and the refrigerator main body 1 that is less than or equal to 35, that is, the power transmission unit is connected when the drawer door is closed. If it is detected that the drawer door is positioned to the point where power can be applied to the member, the drawer door of the freezer compartment 5 is in an open state with an opening amount of 35 or less. If the second door detection 17b cannot detect the door, the freezer compartment 5 is opened with an opening amount of 35 or more, and therefore cannot be closed with the door opening / closing mechanism of the present invention. In that case, the notification means 70 is sounded to notify the user of an alarm that the door is a half door (block 57).

  If the second door detection 17b can detect the door, the freezer compartment 5 is in a half-door state and can be closed by the door opening / closing device 10, so the motor 24 is energized (block 58). The rotation direction at this time is rotated in the reverse rotation direction (opposite to the positive rotation direction that is the rotation direction of the rotating plate 19 when the drawer is pulled out). In FIG. 7, the drawer door is closed in the CW direction. Further, at this time, if the rotational speed of the rotating plate 19 is reduced by reducing the voltage applied to the motor 24 to, for example, about 1/2 to 1/3 of the rated voltage, Since the third drive pin 20c positioned farthest from the center of rotation does not cause an impact that collides with the third receiving surface 21c of the connecting plate 16, it is preferable.

  If the motor 24 is energized in the CW direction for a predetermined time, for example, 3 seconds (block 59), the rotating plate 19 reaches the state shown in FIG. 7B and the connecting plate 16 is moved in the direction of arrow 36, that is, in the direction of closing the freezer compartment 5. The freezer 5 is closed by moving. After a predetermined time has elapsed, this time, the motor 24 is energized so as to rotate in the CCW direction (block 60), and the rotating plate 19 rotates until it reaches the origin range 40 (shown in FIG. 8) as shown in FIG. 7C. If it is detected by the signal from the rotation detection means 32 that the position is within the origin range 40 (block 61), the rotation of the motor 24 is stopped (block 62). Here, if the first door detection 17a detects that the freezer compartment 5 is closed (block 63), it can be confirmed that the freezer compartment 5 has been completely closed, so the processing is terminated (block). 66). If the first door detection 17a cannot detect the closing of the freezer compartment 5, it can be determined that the half-door state is continuing, so the processing from block 58 to block 63, that is, the motor 24 is energized and rotated. The operation of rotating the plate 19 in the CW direction to close the freezer compartment 5 is repeated a plurality of times (block 64). If the closing of the first door detection 17a cannot be detected even after repeating this closing operation a predetermined number of times, for example, three times, it is determined that, for example, something is caught and the drawer door of the freezer compartment 5 cannot be closed. Then, the alarm means 70 that notifies the abnormality is sounded to notify the user of an alarm that the door is a half door (block 65).

  Furthermore, for example, in order to prevent a phenomenon such as a child accidentally pressing the door opening switch 8 to open the freezer compartment 5 and hit the child's body, the opening operation of the freezer compartment 5 described with reference to FIG. 10 is not performed. Alternatively, the operation of the open switch may be disabled, and the user can select to perform only the closing operation shown in FIG.

  In the above description, a configuration in which three drive pins 20 are provided on the rotating plate 19 has been described. However, the drive pins 20 are not limited to three, and will be described with reference to FIG. In FIG. 12, the fourth drive pin 20d is provided on the rotary plate 19 at a position at a distance r4 (> r3) from the drive shaft 18. The coupling plate 16 is provided with a fourth receiving surface 21d on which the fourth drive pin 20d abuts. In the operation of opening the freezer compartment 5, the same operation as shown in FIG. 6 is performed, and in addition, the fourth drive pin 20 d pushes the fourth receiving surface 21 d to the left in the figure, so that the connecting plate 16 rotates. The range for receiving force from the plate 19 is expanded. In addition, since r4> r3, if the rotational speed of the drive shaft 18 is constant, the speed at which the fourth drive pin 20d pushes the fourth receiving surface 21d to the left in the figure is the case where there is no fourth drive pin 20d. It becomes larger by r4 / r3. As described above, since both the range of force and the speed are enlarged, when the freezer compartment 5 is opened, the opening amount of the freezer compartment 5 is enlarged, and from the user's point of view, after pressing the open switch 8 The response of the opening movement of the can be improved and a comfortable operation feeling can be obtained. Further, when the rotating plate 19 is rotated in the direction of arrow CW and the connecting plate 16 is moved in the direction of arrow 36 in the same manner as described in FIG. The fourth receiving surface 21d is pushed. Since the fourth drive pin 20d has a larger distance from the drive shaft 18 than r4 and the third drive pin 20c, the opening 35 of the connecting plate 16 is set to about r4 /. Even if r3 is increased, the freezer compartment 5 can be closed. In this way, since the opening amount 35 that can be closed from the half-door state can be increased, the freezer compartment 5 can be more reliably closed even if a half-door is generated, energy saving can be realized, and the stored food can be removed from the outside air. Deterioration due to intrusion can be prevented.

(Up / down movement of drawer door)
Furthermore, the operation when the door opening and closing device according to the present invention is provided in both the freezer compartment 5 and the vegetable compartment 6 will be described. Here, as shown in FIG. 2, it is assumed that the vegetable compartment 6 is in the vicinity of the bottom of the lowermost stage, and the freezer compartment 5 is provided on the upper stage.

  When the user stands in front of the refrigerator body 1 and opens the freezer 5, if the freezer 5 is electrically opened, for example, about 15 cm to 20 cm, the inside of the freezer is opened from the opening when opened. It is preferable because it can be overlooked. On the other hand, in the vegetable compartment 6, if the vegetable compartment 6 is opened in the same manner as the freezer compartment because the vegetable compartment 6 is in the vicinity of the floor surface, the lower end of the door of the vegetable compartment 6 may hit the user's toe when opened.

  In order to prevent the lower end of the door of the vegetable compartment 6 from hitting the user's toe when the door is opened, the vegetable compartment 6 in the lower stage has a lower opening speed when opening than the freezer compartment 5 in the upper stage. In addition, it is desirable for safety to further reduce the opening amount to within 10 cm, for example.

  In the above description, the vegetable room is described as being at the lower end of the freezer room. However, when the freezer room is at a lower stage than the vegetable room, the opening amount or opening speed of the freezer room should be smaller than the vegetable room. Is desirable.

  According to the invention described in the present embodiment, it is possible to reduce the opening force of the drawer door of the refrigerator and easily open the door, and to automatically close the door from a so-called half-door state to save energy. There is an effect that the effect can be improved.

  That is, when the freezer compartment 5 starts to be opened from the closed state, the first drive pin 20a disposed closest to the drive shaft 18 pushes and drives the connecting plate 16, thereby generating a large force at a low speed. Then, the magnet packing is peeled off, and then the second drive pin 20b provided farther than the first drive pin 20a pushes the connecting plate 16 and drives it with a medium force at a medium speed. The opening operation is continued against the pulling force of the closer 13 to accelerate the freezer compartment 5, and further, a third drive pin 20c provided farther from the drive shaft 18 than the second drive pin 20b is connected. The freezing chamber 5 can be further accelerated by pushing out the plate 16 and driving at a high speed with a small force. Therefore, it is convenient to surely perform the opening operation of the freezing chamber 5, and the opening operation surely. Can be carried out, there is an effect that.

  Furthermore, even if the freezer compartment 5 is not completely closed and is in a so-called half-door state, the rotating plate 19 is rotated in the opposite direction to the case where the freezer compartment 5 is opened, thereby freezing the connecting plate 16. Since the chamber 5 can be closed by applying a force in the closing direction, a half-door is prevented and an energy saving effect is obtained. By repeating the above closing operation a plurality of times, the effect of further ensuring the prevention of half-doors can be obtained.

  Further, if the opening amount 35 for starting to close the freezer compartment is made smaller than the door thickness 71, there is no risk that a finger or the like will be caught, and there is an effect that safety is high.

  When opening and closing manually, the door opening and closing mechanism does not contact the drive mechanism provided in the refrigerator main body and the connecting plate provided integrally with the drawer door, thus preventing manual operation by the user when opening and closing the drawer. In addition, there is an effect that it is easy to use because a phenomenon such as a heavy opening and closing operation does not occur, and the user's usability is not impaired even in the event of a failure.

  In the present embodiment, the door opening / closing device 10 is provided on the drawer door of the freezer compartment 5 or the vegetable compartment 6. However, the present invention is not limited to this embodiment, and the rotary type of the refrigerator compartment 2 is not limited to this embodiment. It goes without saying that the same effect can be obtained even if it is provided on the door.

  Further, in the present embodiment, the configuration in which the refrigerator is provided with the door opening / closing device has been described, but the present invention is not limited to the refrigerator. It is apparent that the present invention can be applied to a drawer-type device such as a dishwasher, and in that case, the same effect as described in the present invention can be obtained.

  In the present embodiment, an example in which the drive mechanism 15 is configured by only a spur gear is shown, but the drive mechanism 15 is not limited to a spur gear, and may be configured by using a worm gear.

  Furthermore, the drive pin 20 may be a rotary roller instead of the cylindrical pin as in the present embodiment. Furthermore, the drive pin 20 may have a shape that forms a part of a cylinder only in a range in contact with the receiving surface 21, and may be connected to each other in a range that does not interfere with the connecting plate 16.

The perspective view which shows the structure of the refrigerator by this invention. Sectional drawing which shows the structure of the refrigerator by this invention. The top view which shows the structure of the drawer door opening / closing apparatus of the refrigerator by this invention. The perspective view which shows the structure of the drawer door opening / closing apparatus of the refrigerator by this invention. The perspective view which shows the structure of the drawer door opening / closing apparatus of the refrigerator by this invention. The figure explaining opening operation | movement of the drawer door opening / closing apparatus of the refrigerator by this invention. The figure explaining closing operation | movement of the drawer door opening / closing apparatus of the refrigerator by this invention. The figure explaining the position at the time of the stop of the drawer door opening / closing apparatus of the refrigerator by this invention. The block diagram which shows the structure of the control system of the drawer door opening / closing apparatus of the refrigerator by this invention. The flowchart which shows the control procedure in the case of opening operation | movement of the drawer door opening / closing apparatus of the refrigerator by this invention. The flowchart which shows the control procedure in the case of closing operation | movement of the drawer door opening / closing apparatus of the refrigerator by this invention. The figure which shows another structure of the drawer door opening / closing apparatus of the refrigerator by this invention. The figure explaining the structure by the conventional cam. The figure explaining opening operation | movement of the drawer door opening / closing apparatus of the refrigerator by this invention. The figure which shows the structure of the open switch of the drawer door opening / closing apparatus of the refrigerator by this invention. The enlarged view which shows the structure of the open switch of the drawer door opening / closing apparatus of the refrigerator by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerator body 2 Refrigerating room 3 Switching room 4 Ice making room 5 Freezing room 6 Vegetable room 7 Operation display part 8 Open switch 10 Door opening / closing device 11 Slide rail 12 Container 13 Closer 14 Magnet packing 15 Driving mechanism 16 Connecting plate 17 Door detection 17a First One door detection 17b Second door detection 18 Drive shaft 19 Rotating plate 20 Drive pin 20a First drive pin 20b Second drive pin 20c Third drive pin 20d Fourth drive pin 21 Receiving surface 21a First Receiving surface 21b Second receiving surface 21c Third receiving surface 21d Fourth receiving surface 22 Return surface 23 Opening direction 24 Motor 25 Motor pinion 26, 28 Idler 27, 29 Idler pinion 30 Drive gear 31 Torque limiting means 32 Rotation detection Means 33 Movement amount 34 Retraction position 35 Opening amount 36, 81 Arrow 37a First tip 37b Second End 37c Third tip 38, 39 Clearance 40 Origin range 41 Control circuit 42 Power supply 70 Notification means 71 Door thickness 72 Door clearance 73 Maximum opening 74 Inertial opening 75, 86 Contact 76 Cam 77 Rotation center 78 Cam outer circumference 79 Cam receiving plate 80 Rotating direction 82 Cam radius 83 Peripheral speed 84 Opening speed 85 Sliding speed 87 Frame 88 Push button 89 Push bar 90 Return spring 91 Push amount 92 Switch body 93 Plunger 94 Wiring

Claims (3)

In a drawer-type device with a drawer door that can be pulled out in the front-rear direction,
The drawer door is configured to be able to be pulled out in the front-rear direction by a rail,
A drive mechanism having a rotation drive unit;
Control means for controlling the drive mechanism;
A rotating member provided with a plurality of power transmission units at a position that is rotationally driven by the rotational driving unit and gradually changes the distance from the rotation center in the rotational direction;
A connecting member that receives power from the power transmission unit and converts the rotational motion of the rotating member into linear motion;
Have a, a closer is closed urging means to draw in the closing direction on the rail,
The connecting member is a pull-out device which is characterized that you have provided on the lower surface of the housing portion can be pulled out in the longitudinal direction together with the drawer door or the drawer door. 2. The drawer-type device according to claim 1, wherein the connecting member has a step portion having a plurality of steps, and receives the power of the power transmission portion at the step portion. 3. The power transmission unit according to claim 2, further comprising a switch for opening the drawer door, wherein the control means operates the drive mechanism when the switch is operated, and is at a distance closest to a rotation center of the rotating member. Power is transmitted to the first step of the connecting member from the power transmission portion at the next closest distance from the rotation center of the rotating member, and the power is sequentially transmitted to the second step of the connecting member. After the power is transmitted from the part to the step part, the connecting member is separated from the power transmission part, and the drawer door is opened.

Images