JPWO2019021506A1 - Door opening/closing mechanism - Google Patents

Abstract

In a door opening/closing mechanism including a main body portion 2 having an opening surface 3a and a door 4 opening/closing the opening surface 3a, from a predetermined first self-closing start position P2 to a first self-closing end position P0 in which the door 4 is closed. Between the first self-closing mechanism portion that urges the door 4 in the closing direction at the time T1 and the second self-closing start position P4 on the door opening side of the first self-closing start position P2 from the first self-closing start position P2. And a second self-closing mechanism portion that urges the door 4 in the closing direction at T2 until the second self-closing end position P1 on the door closing side.

Description

The present invention relates to a door opening/closing mechanism that opens/closes a door.

A conventional door opening/closing mechanism is disclosed in Patent Document 1. In this door opening/closing mechanism, the door is pivotally supported on one end of a main body having an opening surface on the front surface by a vertical pivot shaft, and the door is rotated to open/close the opening surface. A pair of hinge pins forming a pivot shaft are vertically arranged on the upper and lower wall surfaces of the main body. A first inclined surface and a second inclined surface that are inclined in the circumferential direction with respect to the horizontal are formed on the seat surface of the lower hinge pin. Bearing parts to which hinge pins are fitted are provided on the upper and lower surfaces of the door. A follower projecting downward is provided on the lower surface of the lower bearing portion.

The follower slides on the first inclined surface when the rotation angle from the closed state of the door becomes equal to or smaller than the first rotation angle, and when the rotation angle becomes equal to or larger than the second rotation angle, the second inclined surface. Positioned to slide on.

When the door is opened from the closed state, the follower slides on the first inclined surface and rises. When the door is opened to the second rotation angle and the follower is arranged on the second inclined surface, the door is urged in the opening direction by its own weight. The follower slides on the second inclined surface and descends due to the weight of the door, and the door is opened. Accordingly, even if a weak force is applied in the direction of closing the door, the follower can contact the second inclined surface and keep the door open.

When the door is closed from the open state, the follower slides on the second inclined surface and rises. When the door is closed to the first rotation angle and the follower is arranged on the first inclined surface, the door is urged in the closing direction by its own weight. The follower slides on the first inclined surface and descends due to the weight of the door, and the door is closed. As a result, the door is closed and the half-door state can be prevented.

Japanese Patent Laid-Open No. 2007-24460 (4th to 8th pages, FIG. 12)

However, according to the conventional door opening/closing mechanism, when the first rotation angle is small, the follower may not reach the first inclined surface when the door is closed, and a half-door state of the door may occur. On the other hand, if the first rotation angle is large, the follower may not slip off from the first inclined surface when the door is opened to a desired position, and the door may self-close against the user's intention. .. Therefore, there is a problem that the convenience of the door opening/closing mechanism is poor.

An object of the present invention is to provide a door opening/closing mechanism that can improve convenience.

In order to achieve the above object, the door opening/closing mechanism of the present invention is a door opening/closing mechanism including a main body portion having an opening surface and a door opening/closing the opening surface, wherein the door is opened from a predetermined first self-closing start position. From a second self-closing start position closer to the door opening side than the first self-closing start position, and a first self-closing mechanism part that urges the door in a closing direction until the first self-closing end position is closed. A second self-closing mechanism portion for urging the door in the closing direction is provided between the first self-closing start position and the second self-closing end position on the door closing side.

Further, the present invention is characterized in that, in the door opening/closing mechanism having the above-mentioned configuration, when the door is opened, the urging in the direction of closing the door by the second self-closing mechanism portion is released.

The present invention further includes, in the door opening/closing mechanism having the above-mentioned configuration, a first opening mechanism portion that urges the door opening side in a direction to open the door from a first opening start position near the second self-closing start position. It is characterized by

Further, in the door opening/closing mechanism of the above structure according to the present invention, the first opening start position is arranged closer to the door closing side than the second self-closing start position, and the first opening mechanism part resists the biasing force of the first opening mechanism part. The second self-closing mechanism section is characterized in that the door is closed.

Further, in the door opening/closing mechanism having the above structure, the present invention provides a first inclined surface and a second inclined surface which are provided on one of the body portion and the door and are inclined with respect to the horizontal, and the other of the body portion and the door. And a follower slid on the first inclined surface and the second inclined surface by the weight of the door, and the first self-closing mechanism portion is formed by the first inclined surface and the follower. In addition, the first opening mechanism portion is formed by the second inclined surface and the follower.

Further, according to the present invention, in the door opening/closing mechanism configured as described above, the urging force by the first self-closing mechanism section between the switching position on the door closing side of the second self-closing end position and the first self-closing end position. Is smaller than the urging force by the first self-closing mechanism portion between the switching position and the second self-closing end position.

Further, the present invention provides the door opening/closing mechanism configured as described above, wherein the door is provided by the first self-closing mechanism section between a switching position on a door closing side of the second self-closing end position and the first self-closing end position. It is characterized by having a regulation unit that regulates the closing speed of the.

Further, according to the present invention, in the door opening/closing mechanism having the above-mentioned configuration, when the door is closed, the restriction portion supports the door against the biasing force of the first self-closing mechanism portion and closes the door at a predetermined speed. The feature is to guide in the direction.

Further, in the door opening/closing mechanism of the above structure according to the present invention, the pivot shaft is arranged at both ends of the door to selectively open and close the door from both ends, and the door is opened from the first self-closing end position. A pair of second opening mechanism parts for urging the doors in the opening direction, and the second opening mechanism parts for urging the doors when one of the doors is opened is closed by the second opening mechanism part when closing the doors from the other. Is formed.

According to the present invention, in the door opening/closing mechanism having the above structure, a slider provided on the main body and rotated by a motor drive, and a pair of first cam surfaces provided on the door and sliding on the slider. And a pair of second cam surfaces,
The second self-closing mechanism section that closes the door from one side is formed by the slider and the one first cam surface, and the second opening mechanism section that opens one of the doors is the slider and Formed by one of the second cam surfaces,
The second self-closing mechanism section that closes the door from the other side is formed by the slider and the other first cam surface, and the second opening mechanism section that opens the other side of the door is the slider and Formed by the other second cam surface,
When one of the doors is closed, the slider rotates in a predetermined direction and slides on one of the first cam surfaces, separates from the first cam surface at the second self-closing end position, and switches to the switching position. It rotates in the direction opposite to the predetermined direction and slides on the other second cam surface forming the regulation portion.

Further, according to the present invention, in the door opening/closing mechanism configured as described above, a retracted position at which the slider does not interfere with the first cam surface and the second cam surface when the slider manually opens the door at the first self-closing end position. It is characterized by being placed in.

Further, the refrigerator of the present invention is characterized by including the door opening/closing mechanism having each of the above-mentioned configurations, the drive section being installed on the upper surface of the main body section, and the pivot shaft being arranged vertically.

According to the present invention, the first self-closing mechanism portion that urges the door between the first self-closing start position and the first self-closing end position, and the second self-closing mechanism that is closer to the door opening side than the first self-closing start position. And a second self-closing mechanism portion that urges the door between the start position and the second self-closing end position on the door closing side of the first self-closing start position. Therefore, when closing the door, the second self-closing mechanism portion and the first self-closing mechanism portion can be biased in this order to close the door in a wide range, and a half-door state can be prevented. Further, by limiting the biasing force of the second self-closing mechanism portion when opening the door, it is possible to prevent the door from being closed against the intention of the user. Therefore, the convenience of the door opening/closing mechanism can be improved.

The front view which shows the refrigerator of 1st Embodiment of this invention. Side sectional drawing which shows the principal part of the refrigerator of 1st Embodiment of this invention. The front view which shows the angle of the refrigerator of 1st Embodiment of this invention. The top view which shows the uneven|corrugated part of the refrigerator of 1st Embodiment of this invention. The development view which shows the uneven|corrugated part and follower of the refrigerator of 1st Embodiment of this invention. The top view which shows the refrigerator of 1st Embodiment of this invention. The top view explaining the door opening operation of the door opening/closing device of the refrigerator of 1st Embodiment of this invention. The development view which shows the arrangement of the concavo-convex portion and the follower when the door of the refrigerator of the first embodiment of the present invention is opened. The development view which shows the arrangement of the concavo-convex portion and the follower when the door of the refrigerator of the first embodiment of the present invention is opened. The top view explaining the door opening operation of the door opening/closing device of the refrigerator of 1st Embodiment of this invention. The development view which shows the arrangement of the concavo-convex portion and the follower when the door of the refrigerator of the first embodiment of the present invention is opened. The top view explaining the door opening operation of the door opening/closing device of the refrigerator of 1st Embodiment of this invention. The top view explaining the door closing operation of the door opening/closing device of the refrigerator of 1st Embodiment of this invention. The top view explaining the door closing operation of the door opening/closing device of the refrigerator of 1st Embodiment of this invention. The development view which shows the concavo-convex part and follower of the refrigerator of a 2nd embodiment of the present invention. The top view which shows the refrigerator of 3rd Embodiment of this invention. The top view explaining the door opening operation of the door opening and closing device of the refrigerator of a 3rd embodiment of the present invention. The top view explaining the door opening operation of the door opening and closing device of the refrigerator of a 3rd embodiment of the present invention. The top view explaining the door opening operation of the door opening and closing device of the refrigerator of a 3rd embodiment of the present invention. The top view explaining the door closing operation of the door opening/closing device of the refrigerator of 3rd Embodiment of this invention. The top view explaining the door closing operation of the door opening/closing device of the refrigerator of 3rd Embodiment of this invention. The top view explaining the door closing operation of the door opening/closing device of the refrigerator of 3rd Embodiment of this invention. The front view which shows the refrigerator of 4th Embodiment of this invention. The perspective view which shows the upper part of the refrigerator of 4th Embodiment of this invention. A side sectional view showing angles and rollers of a refrigerator according to a fourth embodiment of the present invention. Front sectional drawing which shows the angle and roller of the refrigerator of 4th Embodiment of this invention. The top view which shows the cam mechanism of the refrigerator of 4th Embodiment of this invention. Sectional view taken along the line AA of FIG. The top view which shows the refrigerator of 4th Embodiment of this invention. The top view explaining operation|movement of the cam mechanism at the time of opening the door of the refrigerator of 4th Embodiment of this invention. The top view explaining operation|movement of the cam mechanism at the time of opening the door of the refrigerator of 4th Embodiment of this invention. The top view explaining the door opening operation of the door opening and closing device of the refrigerator of a 4th embodiment of the present invention. The top view explaining the door opening operation of the door opening and closing device of the refrigerator of a 4th embodiment of the present invention. The top view explaining the door closing operation of the door opening and closing device of the refrigerator of a 4th embodiment of the present invention. The top view explaining the door closing operation of the door opening and closing device of the refrigerator of a 4th embodiment of the present invention. The top view explaining the door closing operation of the door opening and closing device of the refrigerator of a 4th embodiment of the present invention. The top view explaining the door closing operation of the door opening and closing device of the refrigerator of a 4th embodiment of the present invention.

<First Embodiment>
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing the refrigerator of the first embodiment. The refrigerator 1 has a main body 2 made of a heat insulating box, and a refrigerating compartment 3, a freezing compartment 5, and a vegetable compartment 7 which are partitioned by a heat insulating wall 9 (see FIG. 2) are formed in the main body 2 in this order from above.

An opening surface 3a (see FIG. 2) on the front surface of the refrigerating chamber 3 is opened and closed by a door 4 pivotally supported on the main body 2 by a vertical pivot shaft 4c. The pivot shaft 4c is formed by a hinge pin 21 (see FIG. 2) that supports the upper and lower ends of the door 4, respectively. The front opening of the freezer compartment 5 is opened and closed by a sliding door 6. The front opening of the vegetable compartment 7 is opened and closed by a sliding door 8.

A packing (not shown) for preventing cold air leakage is provided on the peripheral portion of each door 4, 6, 8 facing the main body 2. The packing is provided with a magnet (not shown) attracted to the front surface of the main body 2.

FIG. 2 is a side sectional view showing details of the lower portion of the refrigerating compartment 3. The upper and lower ends of the door 4 of the refrigerating chamber 3 are supported by hinge pins 21 forming a pivot shaft 4c (see FIG. 1). An angle 11 holding a hinge pin 21 is attached to the front surface of the heat insulating wall 9 between the refrigerating chamber 3 and the freezing chamber 5.

FIG. 3 shows a front view of the angle 11. 2 and 3, the angle 11 is formed by bending a metal plate into an L-shaped cross section, and the vertical portion 11v is attached to the heat insulating wall 9 by the screw 16. A hinge pin 21 is projectingly provided at one end of the horizontal portion 11h of the angle 11. An annular uneven portion 22 having a plurality of inclined surfaces is formed on the seat surface of the hinge pin 21.

A bearing portion 14 that fits into the hinge pin 21 is attached to the lower surface of the door 4. A follower 14d (see FIG. 5) that slides on the uneven portion 22 is provided on the lower surface of the bearing portion 14 so as to project downward.

4 shows a top view of the uneven portion 22, and FIG. 5 shows a developed view of the uneven portion 22 and the follower 14d. The concavo-convex portion 22 is formed point-symmetrically, and has a pair of inclined surfaces 22a (first inclined surface) that descends clockwise and a pair of inclined surfaces 22c (second inclined surface) that rises clockwise in FIG. is doing. A horizontal plane 22d is provided between the upper end of the inclined surface 22a and the upper end of the inclined surface 22c, and a horizontal plane 22e is provided between the lower end of the inclined surface 22a and the lower end of the inclined surface 22c.

In the present embodiment, the inclined surface 22a is formed within an angle range of 30° about the hinge pin 21. The horizontal plane 22d is formed within a range of an angle of 40° about the hinge pin 21. The inclined surface 22c is formed within an angle range of 20° with the hinge pin 21 as the center.

The follower 14d projecting from the lower end surface of the bearing portion 14 has an inclined surface 14a and an inclined surface 14c that are in surface contact with the inclined surface 22a and the inclined surface 22c of the uneven portion 22, respectively. When the door 4 rotates, the top of the follower 14d slides on the uneven portion 22 and moves up and down.

When the follower 14d is arranged on the inclined surface 22a, the door 4 is biased in the closing direction by its own weight. Therefore, the follower 14d and the inclined surface 22a constitute a first self-closing mechanism portion that urges the door 4 in the closing direction. The first self-closing mechanism portion has a follower 14d at a section T1 between a first self-closing start position P2 where the follower 14d is arranged on the upper end of the inclined surface 22a and a closing position P0 (first self-closing end position) of the door 4. Energize 4. Incidentally, FIG. 5 shows a state in which the follower 14d is arranged at the closed position P0.

When the follower 14d is arranged on the inclined surface 22c, the door 4 is biased in the opening direction by its own weight. Therefore, the follower 14d and the inclined surface 22c constitute a first opening mechanism portion that urges the door 4 in the opening direction. The first opening mechanism portion has a section S1 between the first opening start position P3 where the follower 14d is arranged at the upper end of the inclined surface 22c and the first opening end position P5 arranged at the lower end of the inclined surface 22c. Energize 4.

Further, as will be described later, a second self-closing mechanism portion that urges the door 4 in the closing direction and a second opening mechanism portion that urges the door 4 in the opening direction by driving the motor 52 (see FIG. 6) are provided. .. The second self-closing mechanism section urges the door 4 in a section T2 between the second self-closing start position P4 and the second self-closing end position P1. The second self-closing end position P1 is arranged closer to the door closing side than the first self-closing start position P2. The second self-closing start position P4 is arranged near the first opening start position P3 and closer to the door opening side than the first opening start position P3.

The second opening mechanism urges the door 4 in the section S2 between the closing position P0 and the second opening end position. In the present embodiment, the second opening end position is made to substantially coincide with the second self-closing start position P4, and may be referred to as "second opening end position P4'" in the following description.

A door opening/closing mechanism that opens/closes the door 4 is configured by the first self-closing mechanism section, the second self-closing mechanism section, the first opening mechanism section, and the second opening mechanism section.

A groove portion (not shown) is formed on the seat surface of the hinge pin 21 that supports the upper end of the door 4 and the upper end surface of the door 4 to avoid interference due to the vertical movement of the door 4. With the groove, it is possible to prevent the generation of a gap between the main body 2 and the door 4 due to the vertical movement of the door 4.

Further, one of the inclined surface 14a and the inclined surface 22a that slide with each other may be formed by a vertical plane. Similarly, one of the inclined surface 14c and the inclined surface 22c that slide with each other may be formed by a vertical plane. It is more desirable to form the inclined surface 14a and the inclined surface 22a at the same inclination angle and to form the inclined surface 14c and the inclined surface 22c at the same inclination angle as in the present embodiment because sliding wear can be reduced.

FIG. 6 shows a top view of the refrigerator 1. A support member 51 extending above the door 4 is attached to the upper surface of the main body 2, and the door opening/closing device 50 is installed on the support member 51. The door opening/closing device 50 includes a slider 59, a drive unit 58 for driving the slider 59, and a guide unit 60 for slidingly guiding the slider 59. Further, the door opening/closing device 50 is provided with a detection sensor (not shown) that detects the opening amount of the door 4.

The drive unit 58 includes a motor 52, a worm 53, a worm wheel 54, a reduction gear 55, a reduction gear 56, and a rack 57. The worm 53 is attached to the shaft of the motor 52 and meshes with the worm wheel 54. The reduction gear 55 is attached concentrically with the worm wheel 54. The reduction gear 56 meshes with the reduction gear 55 and the rack 57. The rack 57 is mounted on the support member 51 so as to be slidable in the left-right direction.

The guide portion 60 is provided on the upper surface of the door 4 and has a rib 61 and a rib 62 protruding upward. The rib 61 has a cam surface 61a (second cam surface) that is inclined so as to come closer to the main body portion 2 as it goes away from the pivot shaft 4c. The rib 62 is disposed between the rib 61 and the pivot shaft 4c, and has a cam surface 62a (first cam surface) that is inclined so as to approach the main body portion 2 as it is separated from the pivot shaft 4c.

The slider 59 is provided so as to project from the lower surface of the rack 57 and is arranged between the cam surface 61a and the cam surface 62a. As a result, when the motor 52 is driven, the slider 59 moves in the left-right direction via each gear and slides on the cam surface 61a and the cam surface 62a.

In the following description, a direction (operating direction) perpendicular to the normal line of the opening surface 3a and the pivot shaft 4c is the X direction, the normal direction of the opening surface 3a is the Y direction, and the axial direction of the pivot shaft 4c is the Z direction. There are cases. In this embodiment, the X direction is the left-right direction, the Y direction is the front-back direction, and the Z direction is the up-down direction.

In the closed state of the door 4, the slider 59 is arranged at the retracted position between the rib 61 and the rib 62. For this reason, the slider 59 at the retracted position does not interfere with the guide portion 60 during the drive standby with the motor 52 stopped, and the door 4 can be opened manually.

When a predetermined operation button is operated in the closed state of the door 4, the driving unit 58 drives the door 4 to open. When the door is opened, the reduction gear 56 rotates clockwise CW in the figure as shown in FIG. 7, and the slider 59 moves in the direction away from the pivot shaft 4c in the X direction (left in the figure). It abuts on the cam surface 61a of the rib 61. When the slider 59 further moves to the left in the figure, the sliding of the slider 59 and the cam surface 61a urges the door 4 in the opening direction.

As a result, as shown in FIG. 8, the follower 14d moves up the inclined surface 22a against the biasing force of the door 4 due to its own weight, and the door 4 is opened while being opened. Further, as shown in FIG. 9, the follower 14d slides on the horizontal surface 22d to open the door 4 horizontally.

As shown in FIG. 10, when the door 4 is opened by a predetermined amount, the slider 59 reaches the terminal end (rear end) of the cam surface 61a, and the driving unit 58 ends the door opening drive. At this time, the follower 14d is arranged at the second opening end position P4' (second self-closing start position P4) on the door opening side of the first opening start position P3. Therefore, the drive portion 58 including the slider 59 and the cam surface 61a form a second opening mechanism portion that urges the door 4 in the direction to open the door 4 in the section S2.

When the door opening drive by the drive unit 58 is finished, the follower 14d slides on the inclined surface 22c as shown in FIG. 11, and the door 4 is opened by the first opening mechanism unit that biases the door 4 by its own weight. When the door 4 reaches the first opening end position P5, the follower 14d is arranged on the horizontal plane 22e. After that, the door 4 is manually opened. As a result, the burden of opening the door 4 can be reduced.

Further, when the detection sensor detects that the door opening drive by the drive unit 58 is completed, the motor 52 is driven in reverse as shown in FIG. 12, and the reduction gear 56 rotates counterclockwise CCW in the figure. As a result, the slider 59 moves in the direction approaching the pivot shaft 4c in the X direction (to the right in the figure), is placed in the retracted position, and the motor 52 is stopped.

Next, when the door 4 is manually closed from the open state of the door 4, the follower 14d slides on the inclined surface 22c and the door 4 rises (see FIG. 9). When the detection sensor detects that the door 4 has been closed to the second self-closing start position P4 (see FIG. 9), the driving unit 58 drives the door 4 to close.

As a result, as shown in FIG. 13, the reduction gear 56 rotates counterclockwise CCW in the drawing, and the slider 59 in the retracted position approaches the pivot shaft 4c in the X direction (to the right in the drawing). It moves and contacts the cam surface 62a of the rib 62. When the slider 59 further moves to the right in the figure, the door 4 is closed by the sliding of the slider 59 and the cam surface 62a.

As shown in FIG. 14, when the door 4 is closed by a predetermined amount, the slider 59 reaches the end (front end) of the cam surface 62a, leaves the cam surface 62a, and ends the drive for closing the door by the drive unit 58. At this time, the follower 14d is arranged at the second self-closing end position P1 (see FIG. 5) closer to the door than the first self-closing start position P2. Therefore, the drive portion 58 including the slider 59 and the cam surface 62a form a second self-closing mechanism portion that urges the door 4 in the direction to close it in the section T2.

The second self-closing start position P4 substantially coincides with the second opening end position P4', but it may be a different position. At this time, the follower 14d may be arranged on the inclined surface 22c at the second opening end position P4', and the follower 14d may be arranged on the horizontal plane 22d at the second self-closing start position P4.

Since the follower 14d slides on the inclined surface 22a when the door closing drive by the drive unit 58 is completed, the door 4 is closed by the first self-closing mechanism unit that biases the door 4 by its own weight. As a result, the load when closing the door 4 can be reduced and the half-door state can be prevented.

In addition, when the detection sensor detects that the drive for closing the door is completed, the motor 52 is reversed. Then, the slider 59 moves in the direction away from the pivot shaft 4c in the X direction (to the left in the drawing), is placed at the retracted position as shown in FIG. 6, and the motor 52 is stopped.

When the door 4 is manually closed to the closed position, the slider 59 is arranged at the retracted position, so that the door 59 can be closed by preventing interference between the slider 59 and the guide portion 60. it can.

At this time, after the detection sensor detects that the door 4 has been closed to the second self-closing start position P4, the drive unit 58 may drive the door 4 to close after a lapse of a predetermined delay time. Further, it may be determined that the door 4 has been closed to a predetermined position by calculating transition information of the detection sensor, and the door 4 may be driven to be closed based on the determination result. Further, the door 4 may be closed by the drive unit 58 when the closing speed of the door 4 when passing through the second self-closing start position P4 is equal to or lower than a predetermined speed. With these, it is possible to prevent the motor 52 from being driven even when the door 4 is manually closed to the closed position.

According to the present embodiment, the first self-closing mechanism unit that urges the door 4 in the section T1 between the first self-closing start position P2 and the closing position P0 (first self-closing end position) is provided. In the section T2 between the second self-closing start position P4 on the door opening side of the first self-closing start position P2 and the second self-closing end position P1 on the door closing side of the first self-closing start position P2. A second self-closing mechanism portion that urges the door 4 is provided.

Therefore, when the door 4 is closed, the door 4 can be biased in the order of the second self-closing mechanism portion and the first self-closing mechanism portion, and the door 4 can be closed within a wide range. Therefore, when the door 4 is closed, the self-closing range can be expanded, the burden of closing the door 4 can be reduced, and the half-door state can be prevented. Therefore, the convenience of the door opening/closing mechanism and the refrigerator 1 can be improved.

Further, since the slider 59 does not slide on the cam surface 61a when the door 4 is opened, the urging of the second self-closing mechanism portion in the direction of closing the door 4 is released. This makes it possible to easily shorten the range in which the door 4 is closed when opening the door 4, and prevent the opened door 4 from being closed against the user's intention.

Further, there is provided a first opening mechanism portion that urges the door 4 in the direction to open the door 4 in the section S1 on the door opening side from the first opening start position P3 near the second self-closing start position P4. Thereby, even if a weak force is applied in the closing direction of the door 4, the opened state of the door 4 can be maintained, and when the user tries to close the door 4, the door is closed by the second self-closing mechanism section. 4 can be closed securely.

Further, the first opening start position P3 is arranged closer to the door closing side than the second self-closing start position P4, and the door 4 is closed by the second self-closing mechanism section against the biasing force of the first opening mechanism section. For this reason, even if the user's force to close the door 4 is weak and the first opening start position P3 cannot be exceeded, the second self-closing mechanism portion urges the door 4 in the closing direction, so that the first opening is performed. It is possible to prevent the door 4 from bouncing due to the urging force of the mechanism section. Therefore, the convenience of the door opening/closing mechanism and the refrigerator 1 can be further improved.

Further, it is possible to easily realize the first self-closing mechanism portion and the first opening mechanism portion that bias the door 4 by the own weight of the door 4 by the inclined surfaces 22a and 22c (first and second inclined surfaces) and the follower 14d. You can Further, the second self-closing mechanism section and the second opening mechanism section for urging the door 4 by the motor drive by the cam surfaces 61a and 62a and the slider 59 can be easily realized.

In the present embodiment, the rib 61 may be arranged between the rib 62 and the pivot shaft 4c, and the cam surface 61a and the cam surface 62a may be inclined so as to come closer to the main body portion 2 as they approach the pivot shaft 4c. As a result, the slider 59 moves in a direction approaching the pivot shaft 4c in the X direction to open the door 4, and moves in a direction away from the pivot shaft 4c to close the door 4.

Further, the slider 59 may be provided on the upper surface of the door 4 and the cam surfaces 61a and 62a may be provided on the rack 57.

<Second Embodiment>
Next, FIG. 15 shows a development view of the uneven portion 22 and the follower 14d of the refrigerator 1 of the second embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 14 are given the same reference numerals. In this embodiment, the inclined surface 22a of the uneven portion 22 that constitutes the first self-closing mechanism has a plurality of inclined angles. Other parts are the same as those in the first embodiment.

The inclined surface 22a has an inclined surface 22b on the door closing side of the switching position Ps between the closed position P0 and the second self-closing end position P1 whose inclination angle with respect to the horizontal is gently changed. Therefore, the biasing force of the door 4 of the first self-closing mechanism portion due to its own weight is smaller between the switching position Ps and the closing position P0 than between the switching position Ps and the second self-closing end position P1.

The door 4 is accelerated at the speed at which the follower 14d slides on the inclined surface 22a to close itself, and the inclined surface 22b reduces the acceleration, so that the speed at which the door 4 closes itself is restricted. As a result, the impact when the door 4 is closed by the first self-closing mechanism portion is alleviated. Therefore, it is possible to reduce the scattering of the stored items and the impact sound due to the impact. Further, when the fingers arranged on the front surface of the main body portion 2 touch the inner surface of the door 4 which is closed at a low speed, the fingers can be retracted, and the finger jamming can be prevented.

According to this embodiment, the urging force by the first self-closing mechanism section between the switching position Ps on the door closing side of the second self-closing end position P1 and the closing position P0 (first self-closing end position) is switched. It is smaller than the urging force by the first self-closing mechanism portion between the position Ps and the second self-closing end position P1. As a result, it is possible to reduce the scattering of the stored items and the impact sound due to the impact when the door 4 is closed, and to prevent finger jamming.

<Third Embodiment>
Next, FIG. 16 shows a top view of the refrigerator 1 according to the third embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 14 are given the same reference numerals. In this embodiment, the slider 59 is rotated and moved, and the structure of the guide portion 60 is different. Other parts are the same as those in the first embodiment.

The drive unit 58 of the door opening/closing device 50 has the same motor 52, worm 53, worm wheel 54, reduction gear 55, and reduction gear 56 as in the first embodiment. A slider 59 is provided on the lower surface of the reduction gear 56. As a result, the slider 59 is rotated by the drive of the motor 52.

The guide portion 60 is provided on the upper surface of the door 4 and has a rib 63, a rib 73, and a rib 74 protruding upward. The rib 63 has a cam surface 63a (second cam surface), and the rib 73 has a cam surface 73a symmetrical to the cam surface 63a with respect to a center line CL parallel to the Y direction of the reduction gear 56. In the closed state of the door 4 shown in FIG. 16, the cam surface 63a inclines so as to enter the inside of the orbit circle of the slider 59 while moving away from the pivot shaft 4c as it approaches the main body 2. The cam surface 73a inclines so as to approach the pivotal shaft 4c as it approaches the main body 2 and enter the inside of the raceway circle of the slider 59.

Further, the rib 74 has a cam surface 74a (first cam surface) that is inclined so as to move away from the pivot shaft 4c as it approaches the main body 2. That is, the cam surface 74a and the cam surface 73a have opposite inclinations with respect to the Y direction. Further, the cam surface 74a and the cam surface 73a are both arranged on one side (the pivot shaft 4c side in the present embodiment) with respect to the center line CL parallel to the Y direction of the reduction gear 56, and the cam surface 74a is the cam surface 74a. It is arranged closer to the main body 2 than the surface 73a.

When the door 4 is in the drive standby state in the closed state, the slider 59 is arranged at the retracted position where it does not interfere with the guide portion 60 even if the door 4 is opened and closed manually. That is, in the retracted position, the slider 59 is arranged between the rib 63 and the rib 73. Further, the slider 59 is arranged on the outer peripheral side of the locus of the rotation of the cam surfaces 63a and 74a accompanying the opening and closing of the door 4 around the pivot 4c and on the inner peripheral side of the locus of the rotation of the cam surface 63a. It

When a predetermined operation button is operated in the closed state of the door 4, the driving unit 58 drives the door 4 to open. As shown in FIG. 17, the reduction gear 56 rotates clockwise CW in the figure by the door opening drive, and the slider 59 moves in the Y direction and moves away from the pivot shaft 4c in the X direction (in the figure, Move to the left). As a result, the slider 59 slides on the cam surface 63a of the rib 63.

When the door 4 moves in the opening direction due to the sliding of the slider 59 and the cam surface 63a, the follower 14d moves up the inclined surface 22a against the biasing force of the door 4 due to its own weight, as shown in FIG. Then, the door 4 is lifted and opened. Further, as shown in FIG. 9 described above, the follower 14d slides on the horizontal surface 22d to open the door 4 horizontally.

When the door 4 is opened by a predetermined amount, the slider 59 reaches the end (rear end) of the cam surface 63a, and the door opening drive is completed. At this time, the follower 14d is arranged at the second opening end position P4' (second self-closing start position P4) on the door opening side of the first opening start position P3 (see FIG. 5). Therefore, the drive portion 58 including the slider 59 and the cam surface 63a form a second opening mechanism portion that biases the door 4 in the direction to open the door 4 in the section S2.

When the door opening drive by the drive unit 58 is completed, the follower 14d slides on the inclined surface 22c as shown in FIG. 11, and the door 4 is opened by the first opening mechanism unit that biases the door 4 by its own weight. .. As a result, the slider 59 is arranged at a position away from the cam surface 63a as shown in FIG. After that, when the door 4 reaches the first opening end position P5 and the follower 14d is arranged on the horizontal plane 22e, the door 4 is in a sufficiently opened state, and the door 4 can be easily opened manually. When the door-opening drive by the drive unit 58 is completed, the motor 52 is driven to reverse, the slider 59 is arranged at the retracted position as shown in FIG. 16, and the motor 52 is stopped.

Next, when the door 4 is manually closed from the open state of the door 4, the follower 14d slides on the inclined surface 22c and the door 4 rises. When the detection sensor detects that the door 4 is closed to the second self-closing start position P4 (see FIG. 5), the driving unit 58 drives the door 4 to close.

When the door is closed, the reduction gear 56 rotates counterclockwise CCW in the figure as shown in FIG. 19, and the slider 59 in the retracted position approaches the pivot shaft 4c in the X direction (right in the figure). Moving. As a result, the slider 59 slides on the cam surface 74a of the rib 74 and the door 4 is closed.

As shown in FIG. 20, when the door 4 is closed by a predetermined amount, the slider 59 reaches the end (front end) of the cam surface 74a. At this time, the follower 14d is arranged on the inclined surface 22a, and the door 4 is arranged at the second self-closing end position P1 (see FIG. 5) closer to the door than the first self-closing start position P2. Therefore, the drive portion 58 including the slider 59 and the cam surface 74a form a second self-closing mechanism portion that urges the door 4 in the direction to close the door 4 in the section T2.

When the door 4 is closed to the second self-closing end position P1, the first self-closing mechanism section urges the door 4 in the closing direction, and the slider 59 separates from the cam surface 74a. Then, as shown in FIG. 21, the door 4 is arranged at the switching position Ps where the slider 59 contacts the cam surface 73a, and the sliding surface of the slider 59 is switched from the cam surface 74a to the cam surface 73a. Although not shown, the switching position Ps is arranged between the closing position P0 and the second self-closing end position P1 (see FIG. 15) as in the second embodiment.

At this time, the slider 59 is pressed against the cam surface 73a by the own weight of the door 4, and supports the door 4 against the biasing force of the first self-closing mechanism portion. Then, when the slider 59 is inverted and rotated clockwise CW in the figure, the follower 14d descends on the inclined surface 22a (see FIG. 5) and is guided in the direction in which the door 4 is closed. As a result, the door 4 is closed as shown in FIG. After that, the slider 59 is placed in the retracted position shown in FIG.

Therefore, the door 4 is closed at a predetermined speed corresponding to the rotation speed of the slider 59 between the switching position Ps and the closing position P0, and the speed at which the door 4 accelerates due to its own weight is restricted. Therefore, the slider 59 and the cam surface 73a form a regulation portion that regulates the closing speed of the door 4 by the first self-closing mechanism portion that urges the door 4.

As a result, the impact when the door 4 accelerated by the first self-closing mechanism section stops at the closing position P0 is mitigated. Therefore, it is possible to reduce the scattering of the stored goods and the impact sound due to the impact. Further, since the closing speed of the door 4 is regulated to be low, it is possible to easily retract the fingers when the fingers arranged on the front surface of the main body 2 touch the inner surface of the door 4 to be closed. Therefore, it is possible to prevent finger jamming when the door is closed.

When the door 4 is manually closed to the closed position P0, the slider 59 is arranged at the retracted position, so that the door is closed by preventing interference between the slider 59 and the guide portion 60. You can Further, similarly to the first embodiment, the drive of the motor 52 may be prevented when the door 4 is manually closed to the closing position P0.

According to this embodiment, the same effect as that of the first embodiment can be obtained. Further, it is possible to easily realize the second self-closing mechanism portion that biases the door 4 in the direction to close the section T2 by the rotating slider 59 and the cam surface 74a. Further, it is possible to easily realize the second opening mechanism portion that biases the door 4 in the section S2 in the opening direction by the rotating slider 59 and the cam surface 63a.

Further, the speed of the door 4 by the first self-closing mechanism section is restricted by the restriction section formed by the slider 59 and the cam surface 73a. As a result, it is possible to reduce the scattering of the stored items and the impact sound due to the impact when the door 4 is closed, and to prevent finger jamming.

In the present embodiment, the rib 63 may be omitted and the slider 59 may slide on the cam surface 73a to open the door 4. Further, the rib 73 may be omitted and the rib 74 may be arranged at a position symmetrical to the present embodiment with respect to the center line CL.

Moreover, you may arrange|position the some slider 59 in rotational symmetry. As a result, the slider 59 after driving to open the door can be quickly placed in the retracted position.

<Fourth Embodiment>
Next, FIG. 23 shows a front view of the refrigerator 1 according to the fourth embodiment. For convenience of description, the same parts as those in the third embodiment shown in FIGS. 16 to 22 are given the same reference numerals. In this embodiment, the door 4 can be selectively opened from the left and right, and ribs 64 (see FIG. 29) symmetrical to the rib 74 of the guide portion 60 and the center line CL are provided. Further, the concavo-convex portion 22 is omitted and an inclined surface is formed on the angle 11 (see FIG. 25), and the roller 18 (see FIG. 25) is provided in place of the follower 14d. Other parts are the same as in the third embodiment.

The door 4 of the refrigerating compartment 3 has handles 4a and 4b at its left and right ends, and can be pivotally supported by a pivot shaft 4c or a pivot shaft 4d to be selectively opened and closed from left and right directions.

FIG. 24 is a perspective view showing a state in which the upper door 4 of the refrigerator 1 is opened. A pair of support members 10 are arranged at both left and right ends above the refrigerating compartment 3, and an angle 11 extending in the left-right direction is arranged below. A pair of cam mechanisms 12 arranged symmetrically with respect to the center line of the door 4 are provided at both left and right ends of the upper surface of each support member 10 and the door 4. A pair of similar cam mechanisms 12 are provided at both left and right ends of the angle 11 and left and right ends of the lower surface of the door 4.

A pair of left and right cam mechanisms 12 provided above and below the door 4 engages and disengages the door 4 and the main body 2 to form a double door 4. A roller 18 (see FIG. 25) rolling on the angle 11 is provided at the center of the lower surface of the door 4.

25 and 26 show a side sectional view and a front sectional view of the angle 11 and the roller 18. An inclined surface 11a that inclines rearward downward is provided at the rear end of the horizontal portion 11h of the angle 11, and an inclined surface 11c that inclines forward downward is provided at the front end. A horizontal surface 11d is provided between the upper end of the inclined surface 11a and the upper end of the inclined surface 11c.

The support member 17 is attached to the lower surface of the door 4 (see FIG. 24) by a screw (not shown) inserted through the through hole 17a. A plurality of rollers 18 having rotating shafts arranged on the left and right are pivotally supported on the rear portion of the support member 17.

When the roller 18 is arranged on the inclined surface 11a, the door 4 is biased in the closing direction by its own weight. Therefore, the roller 18 and the inclined surface 11a form a first self-closing mechanism portion that urges the door 4 in the closing direction. Similar to FIG. 5 described above, the first self-closing mechanism section is a section between the first self-closing start position P2 and the closing position P0 (first self-closing end position) in which the roller 18 is arranged at the upper end of the inclined surface 11a. Energize the door 4 at T1.

Further, when the roller 18 is arranged on the inclined surface 11c, the door 4 is urged in the opening direction by its own weight. Therefore, the roller 18 and the inclined surface 11c form a first opening mechanism portion that urges the door 4 in the opening direction. Similar to FIG. 5 described above, the first opening mechanism section opens the door at the section S1 between the first opening start position P3 where the roller 18 is arranged at the upper end of the inclined surface 11c and the first opening end position P5 where the roller 18 is arranged at the lower end. Energize 4.

FIG. 27 is a top view showing the cam mechanism 12 above the door 4, and shows a state in which the door 4 is closed. Further, FIG. 28 is a sectional view taken along line AA of FIG. The cam mechanisms 12 arranged at both left and right ends include a hinge pin 21, a rib 24, a first engaging protrusion 25 (each indicated by hatching in the drawing) provided on the support member 10, and a groove cam 31 provided on the door 4. The boss 34 and the second engagement protrusion 35 are provided.

The hinge pin 21 is made of metal that is insert-molded on the support member 10, and forms the pivot shaft 4c and the pivot shaft 4d of the door 4 (see FIG. 23). The rib 24 is formed in an arch shape by resin molding, and is arranged around the hinge pin 21. A guide surface 24a, which is a cylindrical surface concentric with the hinge pin 21, is formed on the inner surface of the rib 24. The guide surface 24a of the rib 24 may be formed by a large number of pins or protrusions, and the envelope surface may be formed as an arc concentric with the hinge pin 21. That is, the guide surface 24a may be formed along an arc that is concentric with the hinge pin 21.

The first engagement protrusion 25 is arranged between the left and right hinge pins 21. The first engagement protrusion 25 is provided with a cylindrical surface 25a concentric with the hinge pin 21 on the near side and a cylindrical surface 25b concentric with the hinge pin 21 on the far side facing each other.

The groove cam 31, the boss 34, and the second engagement projection 35 are formed by a cam member 30 which is integrally resin-molded, and the cam member 30 is attached to the upper surface of the door 4. The groove cam 31 has a first groove portion 32 and a second groove portion 33 that are continuous with the hinge pin 21. The first groove 32 is formed so as to open on the main body 2 side and be inclined so that the open end faces inward in a plane perpendicular to the pivots 4c and 4d. The second groove 33 is continuous with the end opposite to the open end of the first groove 32, bends outward from the first groove 32, and extends in a direction away from the open end of the first groove 32.

The boss 34 is provided with a second groove 33, and has a cylindrical surface 34a that slides on the guide surface 24a of the rib 24. Further, a clearance portion 34b (see FIG. 30) that avoids interference with the rib 24 at a first locking position described later is provided on the peripheral surface of the boss 34. When the guide surface 24a of the rib 24 is a cylindrical surface, the peripheral surface of the boss 34 may be formed by a large number of pins or protrusions. That is, the enveloping surfaces of the many pins and the protrusions forming the peripheral surface of the boss 34 may be formed as a cylindrical surface.

The second engagement projection 35 has sliding surfaces 35a and 35b that slide with the cylindrical surfaces 25a and 25b of the first engagement projection 25, respectively. An escape groove 36 that avoids interference with the first engagement protrusion 25 is provided in the cam member 30 around the second engagement protrusion 35.

FIG. 29 shows a top view of the refrigerator 1. The door opening/closing device 50 has a motor 52, a worm 53, a worm wheel 54, a reduction gear 55, and a reduction gear 56, as in the third embodiment. A slider 59 is provided on the lower surface of the reduction gear 56.

Further, the guide portion 60 is provided symmetrically with respect to the center line CL, and has a rib 63, a rib 64, a rib 73, and a rib 74 protruding upward. The rib 63, the rib 73, and the rib 74 are formed as in the third embodiment. The rib 64 is formed symmetrically with the rib 63 with respect to the center line CL, and has a cam surface 64a (first cam surface).

When the reduction gear 56 is rotated clockwise CW in the figure by the drive of the drive unit 58, the slider 59 slides on the cam surface 63a on the left side in the figure. At this time, the door 4 is pivoted and pivoted by the pivot shaft 4c on the right side. Further, when the reduction gear 56 rotates counterclockwise CCW in the figure by the drive of the drive unit 58, the slider 59 slides on the cam surface 73a on the right side in the figure. At this time, the door 4 rotates by being pivotally supported by the left pivot shaft 4d.

Next, the operation of opening and closing the door 4 will be described as an example of opening and closing from the right. The same applies when opening and closing the door 4 from the left. When the door 4 is closed, the cam mechanisms 12 on both sides are arranged at the first locking position shown in FIG. That is, the left and right hinge pins 21 are arranged at the connecting portion between the first groove portion 32 and the second groove portion 33. Further, the escape portion 34b (see FIG. 30) of the boss 34 is arranged along the guide surface 24a of the rib 24.

Since the first groove portion 32 is inclined with respect to the front-rear direction in the plane perpendicular to the pivot shaft 4d, the hinge pin 21 does not separate from the open ends of the left and right first groove portions 32. Therefore, it is possible to prevent the door 4 from falling off.

In this embodiment, an operation button for opening the door 4 from the right side and an operation button for opening the door 4 from the left side are provided. The operation buttons may not be independent as long as the user can instruct the opening direction of the door 4.

When the operation button for opening the door 4 from the right side is operated, the drive unit 58 drives the door 4 to open from the right side. That is, the reduction gear 56 rotates counterclockwise CCW in FIG. 29, and the slider 59 moves in the direction away from the pivot shaft 4d in the X direction (rightward in the drawing) along with the movement in the Y direction. As a result, the slider 59 slides on the cam surface 73a of the rib 73 and presses the door 4 to the right in the figure.

As a result, the hinge pin 21 engaged with the left groove cam 31 relatively moves to the outside (left side in the drawing) in the second groove portion 33 in the direction away from the first groove portion 32. Since the distance between the two hinge pins 21 is constant, when the left hinge pin 21 relatively moves outward, the right hinge pin 21 moves inward. The open end of the first groove portion 32 is inclined toward the inside of the door 4, and the hinge pin 21 on the right side moves toward the open end of the first groove portion 32 by the engagement guide of the first groove portion 32 by moving inward. Move relative. Therefore, the door 4 rotates while slidingly moving from the pivotal support shaft 4d side on the left side to the open side on the right side, and the door 4 is opened from the right side.

When the door 4 moves in the opening direction due to the sliding of the slider 59 and the cam surface 73a, the roller 18 rises up the inclined surface 11a (see FIG. 25) against the biasing force of the door 4 due to its own weight, and the door 4 Is opened while rising. Further, the roller 18 slides on the horizontal surface 11d (see FIG. 25) to open the door 4 horizontally.

Then, as shown in FIG. 30, the left hinge pin 21 reaches the closed end of the second groove 33, and the cam mechanism 12 is arranged at the second locking position. At this time, the cylindrical surface 34a of the left boss 34 starts sliding with the guide surface 24a of the rib 24. As a result, the hinge pin 21 and the second groove portion 33 engage with each other to restrict the movement of the door 4 in the substantially front-rear direction, and the engagement with the boss 34 and the rib 24 restricts the movement of the door 4 in the substantially lateral direction. It Therefore, the cam mechanism 12 slidably regulates the door 4 at the second locking position to rotatably support the door 4.

Further, the cylindrical surface 25b of the first engaging projection 25 on the right side and the sliding surface 35b of the second engaging projection 35 slide, and the cylindrical surface 25a of the first engaging projection 25 on the left side and the second engaging projection The sliding surface 35a of 35 slides. Thereby, the door 4 can be rotated more stably.

When the door 4 is further opened, the engagement between the right hinge pin 21 and the groove cam 31 is released, as shown in FIG. Further, the engagement between the first engaging protrusion 25 and the second engaging protrusion 35 on the right side is released. As a result, the engagement of the right cam mechanism 12 is released. The door 4 pivots around the left hinge pin 21 as a slide restriction.

As shown in FIG. 32, the slider 59 continuously slides on the cam surface 73a even after the engagement of the right cam mechanism 12 is released. When the door 4 is opened by a predetermined amount, the slider 59 reaches the end (rear end) of the cam surface 73a, and the door opening drive is completed. Therefore, the drive portion 58 including the slider 59 and the cam surface 73a constitute a second opening mechanism portion that urges the door 4 in the direction to open the door 4 in the section S2 (see FIG. 5). Similarly, when the door 4 is opened from the left side, the drive portion 58 including the slider 59 and the cam surface 63a constitute a second opening mechanism portion.

When the door opening drive by the drive unit 58 is completed, the roller 18 slides on the inclined surface 11c (see FIG. 25), and the door 4 is opened by the first opening mechanism unit that biases the door 4 by its own weight. As a result, the slider 59 is arranged at a position away from the cam surface 73a as shown in FIG. After that, when the door 4 reaches the first opening end position P5 (see FIG. 5) and the roller 18 is arranged on the horizontal surface 11d, the door 4 is in a sufficiently opened state, and the door 4 can be easily opened manually. it can. When the door opening drive by the drive unit 58 is completed, the motor 52 is reversed and the slider 59 is placed in the retracted position, and the motor 52 is stopped.

Next, when the door 4 is closed, the left and right cam mechanisms 12 perform the opposite operations to the above. When the door 4 is manually closed from the open state of the door 4, the roller 18 slides on the inclined surface 11c (see FIG. 25) and the door 4 rises. When the detection sensor detects that the door 4 is closed to the second self-closing start position P4 (see FIG. 5), the driving unit 58 drives the door 4 to close.

As shown in FIG. 34, the reduction gear 56 rotates clockwise CW by the door closing drive, and the slider 59 at the retracted position moves in the direction approaching the pivot 4d in the X direction (right in the figure). To do. As a result, the slider 59 slides on the cam surface 64a of the rib 64 and the door 4 is closed.

As shown in FIG. 35, when the door 4 is closed by a predetermined amount, the slider 59 reaches the end (front end) of the cam surface 64a. At this time, the roller 18 is arranged on the inclined surface 11a (see FIG. 25), and the door 4 is arranged at the second self-closing end position P1 closer to the door than the first self-closing start position P2. Therefore, the drive portion 58 including the slider 59 and the cam surface 64a constitute a second self-closing mechanism portion that urges the door 4 in the opening direction in the section T2 (see FIG. 5). Similarly, when the door 4 is opened from the left side, the drive portion 58 including the slider 59 and the cam surface 74a constitute a second self-closing mechanism portion.

When the door 4 is closed to the second self-closing end position P1, the first self-closing mechanism section urges the door 4 in the closing direction, and the slider 59 separates from the cam surface 64a. Then, as shown in FIG. 36, the door 4 is arranged at the switching position Ps where the slider 59 contacts the cam surface 63a, and the sliding surface of the slider 59 is switched from the cam surface 64a to the cam surface 63a.

At this time, the slider 59 supports the door 4 against the biasing force of the first self-closing mechanism portion, and the closing speed of the door 4 is restricted. Then, in the figure of the slider 59, the door 4 is guided in the closing direction by the counterclockwise CCW rotation, and the door 4 is closed as shown in FIG. Therefore, the slider 59 and the cam surface 63a form a regulation portion that regulates the closing speed of the door 4 by the first self-closing mechanism portion. Similarly, when the door 4 is opened from the left side, the slider 59 and the cam surface 73a form a regulation portion that regulates the closing speed of the door 4 by the first self-closing mechanism portion. As a result, the impact when the door 4 is closed by the first self-closing mechanism portion is alleviated.

According to this embodiment, the same effect as that of the third embodiment can be obtained. Further, the cam surface 63a on which the slider 59 slides when the door 4 is opened from the right side forms a restriction portion when the door 4 is opened from the left side. Similarly, the cam surface 73a on which the slider 59 slides when the door 4 is opened from the left side forms a restriction portion when the door 4 is opened from the right side. Therefore, the parts can be shared and the cost can be reduced.

In the present embodiment, the hinge pin 21 and the rib 24 may be provided on the door 4, and the groove cam 31 and the boss 34 may be provided on the main body 2. Further, the first engagement protrusion 25 may be provided on the door 4 and the second engagement protrusion 35 may be provided on the main body 2.

In the first to fourth embodiments, the first self-closing mechanism section and the first opening mechanism section urge the door 4 by its own weight, but the door 4 may be urged by an elastic body such as a spring. Further, the second self-closing mechanism portion and the second opening mechanism portion urge the door 4 by the drive of the motor 52, but the door 4 is attached when the door 4 is moved in one direction by an elastic body having a ratchet mechanism. The urging force may be released by urging when moving in the other direction.

Further, a first self-closing mechanism section, a first opening mechanism section, a second self-closing mechanism section and a second opening mechanism section are provided for the rotating door 4, but the first for the sliding door 4 is provided. You may provide a self-closing mechanism part, a 1st opening mechanism part, a 2nd self-closing mechanism part, and a 2nd opening mechanism part.

INDUSTRIAL APPLICABILITY According to the present invention, it can be used for a device such as a refrigerator provided with a door opening/closing mechanism for opening/closing the door.

1 Refrigerator 2 Main part 3 Refrigerating room 3a Opening surface 4, 6, 8 Door 4a Handle 4c, 4d Pivot shaft 5 Freezing room 6 Vegetable room 9 Insulating wall 10, 17, 51 Supporting member 11 Angle 11a, 11c Inclined surface 11d Horizontal surface 12 cam mechanism 14 bearing part 14a, 14c inclined surface 14d follower 18 roller 21 hinge pin 22 uneven portion 22a, 22b, 22c inclined surface 22d, 22e horizontal surface 24 rib 25 first engaging protrusion 30 cam member 31 groove cam 32 first groove portion 33 2nd groove part 34 Boss 35 2nd engaging protrusion 36 Escape groove 50 Door opening/closing device 52 Motor 53 Worm 54 Worm wheel 55, 56 Reduction gear 57 Rack 58 Drive part 59 Slider 60 Guide part 61, 62, 63, 64 , 73, 74 ribs 61a, 62a, 63a, 64a, 73a, 74a cam surface CL center line P0 closed position (first self-closing end position)
P1 Second self-closing end position P2 First self-closing start position P3 First opening start position P4 Second self-closing start position P4' Second opening end position P5 First opening end position Ps Switching position

Claims (7)

In a door opening/closing mechanism including a main body having an opening surface and a door that opens and closes the opening surface, the door is provided between a predetermined first self-closing start position and a first self-closing end position where the door is closed. A first self-closing mechanism portion for urging the door in a closing direction, and a second self-closing start position on the door opening side from the first self-closing start position to a second door closing side on the door closing side from the first self-closing start position. A second opening/closing mechanism for urging the door in the closing direction up to the closing position. The door opening/closing mechanism according to claim 1, wherein when the door is opened, the biasing force of the second self-closing mechanism portion in the direction of closing the door is released. The first opening mechanism portion for urging the door opening side in the opening direction from the first opening start position near the second self-closing start position is provided. Door opening/closing mechanism described. The urging force by the first self-closing mechanism portion between the switching position on the door closing side of the second self-closing end position and the first self-closing end position is the switching position and the second self-closing end position. The door opening/closing mechanism according to any one of claims 1 to 3, wherein the door opening/closing mechanism is smaller than the urging force of the first self-closing mechanism portion between and. A restriction unit that restricts the closing speed of the door by the first self-closing mechanism unit between the switching position on the door closing side of the second self-closing end position and the first self-closing end position; The door opening/closing mechanism according to any one of claims 1 to 3. A pair of second opening mechanisms are provided in which the pivot shafts are arranged at both ends of the door so that the door can be selectively opened and closed from both ends, and which urges the door in the opening direction from the first self-closing end position. 6. The second opening mechanism portion, which includes a portion and biases the door when one of the doors is opened, forms the restriction portion when closing the door from the other. Door opening/closing mechanism described. And a pair of first cam surfaces and a pair of second cam surfaces provided on the door and sliding on the slider, the slider being provided on the main body and rotated by driving a motor.
The second self-closing mechanism section that closes the door from one side is formed by the slider and the one first cam surface, and the second opening mechanism section that opens one of the doors is the slider and Formed by one of the second cam surfaces,
The second self-closing mechanism section that closes the door from the other side is formed by the slider and the other first cam surface, and the second opening mechanism section that opens the other side of the door is the slider and Formed by the other second cam surface,
When one of the doors is closed, the slider rotates in a predetermined direction and slides on one of the first cam surfaces, separates from the first cam surface at the second self-closing end position, and switches to the switching position. 7. The door opening/closing mechanism according to claim 6, wherein the door opening/closing mechanism rotates in a direction opposite to the predetermined direction and slides on the other second cam surface forming the regulation portion.

Images