JP6909296B2 - Door opening / closing mechanism - Google Patents

Description

The present invention relates to a door opening / closing mechanism for opening / closing 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 by a vertical pivot shaft at one end of a main body having an opening surface on the front surface, and the door rotates 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. Bearings for fitting hinge pins are provided on the upper and lower surfaces of the door. A follower that projects 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 is equal to or less than the first rotation angle, and the second inclined surface when the rotation angle is equal to or more than the second rotation angle. Positioned to slide on.

When the door is opened from the closed state, the slave clause 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 down on the second inclined surface due to the weight of the door, and the door is opened. As a result, even if a weak force is applied in the direction of closing the door, the slave clause abuts on the second inclined surface and the door can be kept open.

When the door is closed from the open state, the slave clause 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 down on the first inclined surface due to the weight of the door, and the door is closed. As a result, the door is self-closed, and a half-door state can be prevented.

Japanese Unexamined Patent Publication No. 2007-24460 (Pages 4-8, 12)

However, according to the conventional door opening / closing mechanism, if the first rotation angle is small, the door may not reach the first inclined surface when the door is closed, resulting in a half-door state of the door. On the other hand, if the first rotation angle is large, the door may self-close against the intention of the user without the follower coming off from the first inclined surface when the door is opened to a desired position. .. Therefore, there is a problem that the door opening / closing mechanism is not convenient.

An object of the present invention is to provide a door opening / closing mechanism capable of improving 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 having an opening surface and a door for opening / closing the opening surface. From the first self-closing mechanism that urges the door to close until the first self-closing end position, and from the second self-closing start position on the door opening side of the first self-closing start position. It is characterized by including a second self-closing mechanism portion that urges the door in the closing direction from the first self-closing start position to 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 configuration, when the door is opened, the urging in the direction of closing the door by the second self-closing mechanism portion is released.

Further, in the door opening / closing mechanism having the above configuration, the present invention includes a first opening mechanism portion that biases the door in the direction of opening the door on the door opening side from the first opening start position near the second self-closing start position. It is characterized by that.

Further, in the door opening / closing mechanism having the above configuration, the first opening start position is arranged on the door closing side of the second self-closing start position, and the door opening / closing mechanism is opposed to the urging force of the first opening mechanism portion. The door is closed by the second self-closing mechanism portion.

Further, according to the present invention, in the door opening / closing mechanism having the above configuration, a first inclined surface and a second inclined surface provided on one of the main body portion and the door and inclined with respect to the horizontal, and the other of the main body portion and the door. The door is provided with a first inclined surface and a slave node that slides on 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 slave node. In addition, the first opening mechanism portion is formed by the second inclined surface and the slave clause.

Further, according to the present invention, in the door opening / closing mechanism having the above configuration, the urging force by the first self-closing mechanism portion between the switching position on the door closing side and the first self-closing end position with respect to the second self-closing end position. However, it is characterized in that it is smaller than the urging force by the first autism mechanism portion between the switching position and the second autism end position.

Further, according to the present invention, in the door opening / closing mechanism having the above configuration, the door 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. It is characterized by having a regulatory unit that regulates the closing speed of the door.

Further, in the door opening / closing mechanism having the above configuration, when the door is closed, the regulating unit supports the door against the urging force of the first self-closing mechanism unit and closes the door at a predetermined speed. It is characterized by guiding in the direction.

Further, in the door opening / closing mechanism having the above configuration, the pivot shaft is arranged at both ends of the door so that the door can be selectively opened / closed from both ends, and the door can be opened / closed from the first self-closing end position. A pair of second opening mechanism portions for urging the door in the opening direction, and the restricting portion for closing the door from the other by the second opening mechanism portion for urging the door when opening one of the doors. Is formed.

Further, in the door opening / closing mechanism having the above configuration, the present invention includes 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 that closes the door from one side is formed by the slider and one of the first cam surfaces, and the second opening mechanism that opens one of the doors is formed by the slider and the first cam surface. Formed by one of the second cam surfaces,
The second self-closing mechanism portion that closes the door from the other is formed by the slider and the first cam surface of the other, and the second opening mechanism portion that opens the other of the door is formed by the slider and the other. 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 the switching position. It is characterized in that it rotates in the opposite direction of the predetermined direction and slides on the other second cam surface forming the restricting portion.

Further, in the door opening / closing mechanism having the above configuration, the present invention is a retracted position that 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 in that it is provided with the door opening / closing mechanism having each of the above configurations, the driving portion is installed on the upper surface of the main body portion, and the pivot shaft is vertically arranged.

According to the present invention, there is a first self-closing mechanism that urges the door between the first self-closing start position and the first self-closing end position, and a second self-closing on the door opening side of the first self-closing start position. It is provided with a second self-closing mechanism portion that urges the door from the starting position to the second self-closing end position on the door closing side from the first self-closing start position. Therefore, when the door is closed, the door can be urged in the order of the second self-closing mechanism portion and the first self-closing mechanism portion to self-close the door in a wide range, and the half-door state can be prevented. Further, by limiting the urging 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.

Front view showing the refrigerator of the first embodiment of the present invention Side sectional view showing a main part of the refrigerator of the first embodiment of the present invention. Front view showing the angle of the refrigerator according to the first embodiment of the present invention. Top view showing the uneven portion of the refrigerator of the first embodiment of the present invention. A development view showing a concave-convex portion and a follow-up section of the refrigerator according to the first embodiment of the present invention. Top view showing the refrigerator of the 1st Embodiment of this invention Top view for explaining the door opening operation of the refrigerator door opening / closing device according to the first embodiment of the present invention. A development view showing the arrangement of the uneven portion and the followers when the door of the refrigerator according to the first embodiment of the present invention is opened. A development view showing the arrangement of the uneven portion and the followers when the door of the refrigerator according to the first embodiment of the present invention is opened. Top view for explaining the door opening operation of the refrigerator door opening / closing device according to the first embodiment of the present invention. A development view showing the arrangement of the uneven portion and the followers when the door of the refrigerator according to the first embodiment of the present invention is opened. Top view for explaining the door opening operation of the refrigerator door opening / closing device according to the first embodiment of the present invention. Top view for explaining the door closing operation of the refrigerator door opening / closing device according to the first embodiment of the present invention. Top view for explaining the door closing operation of the refrigerator door opening / closing device according to the first embodiment of the present invention. A development view showing a concave-convex portion and a follow-up section of a refrigerator according to a second embodiment of the present invention. Top view showing the refrigerator of the third embodiment of this invention Top view for explaining the door opening operation of the refrigerator door opening / closing device according to the third embodiment of the present invention. Top view for explaining the door opening operation of the refrigerator door opening / closing device according to the third embodiment of the present invention. Top view for explaining the door opening operation of the refrigerator door opening / closing device according to the third embodiment of the present invention. Top view for explaining the door closing operation of the refrigerator door opening / closing device according to the third embodiment of the present invention. Top view for explaining the door closing operation of the refrigerator door opening / closing device according to the third embodiment of the present invention. Top view for explaining the door closing operation of the refrigerator door opening / closing device according to the third embodiment of the present invention. Front view showing the refrigerator of the 4th embodiment of this invention A perspective view showing the upper part of the refrigerator according to the fourth embodiment of the present invention. Side sectional view showing the angle and roller of the refrigerator of the fourth embodiment of the present invention. Front sectional view showing an angle and a roller of a refrigerator according to a fourth embodiment of the present invention. Top view showing the cam mechanism of the refrigerator of the 4th Embodiment of this invention. AA cross-sectional view of FIG. 27 Top view showing the refrigerator of the 4th embodiment of this invention The plan view explaining the operation of the cam mechanism at the time of opening the door of the refrigerator of 4th Embodiment of this invention. The plan view explaining the operation of the cam mechanism at the time of opening the door of the refrigerator of 4th Embodiment of this invention. Top view for explaining the door opening operation of the refrigerator door opening / closing device according to the fourth embodiment of the present invention. Top view for explaining the door opening operation of the refrigerator door opening / closing device according to the fourth embodiment of the present invention. Top view for explaining the door closing operation of the refrigerator door opening / closing device according to the fourth embodiment of the present invention. Top view for explaining the door closing operation of the refrigerator door opening / closing device according to the fourth embodiment of the present invention. Top view for explaining the door closing operation of the refrigerator door opening / closing device according to the fourth embodiment of the present invention. Top view for explaining the door closing operation of the refrigerator door opening / closing device according to the fourth embodiment of the present invention.

<First Embodiment>
An embodiment 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 formed of a heat insulating box, and a refrigerating room 3, a freezing room 5, and a vegetable room 7 partitioned by a heat insulating wall 9 (see FIG. 2) are formed in the main body 2 in this order from above.

The 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 by a vertical pivot shaft 4c on the main body 2. The pivot shaft 4c is formed by hinge pins 21 (see FIG. 2) that support the upper and lower ends of the door 4. The opening surface on the front surface of the freezing chamber 5 is opened and closed by a sliding door 6. The opening surface on the front surface of the vegetable compartment 7 is opened and closed by the sliding door 8.

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

FIG. 2 is a side sectional view showing the details of the lower part of the refrigerator compartment 3. The upper and lower ends of the door 4 of the refrigerator compartment 3 are supported by hinge pins 21 forming a pivot shaft 4c (see FIG. 1). An angle 11 for holding the 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. In FIGS. 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 a screw 16. A hinge pin 21 is projected from 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 fitted to the hinge pin 21 is attached to the lower surface of the door 4. A follow-up section 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.

FIG. 4 shows a top view of the uneven portion 22, and FIG. 5 shows a developed view of the uneven portion 22 and the subsection 14d. The uneven 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 in an angle of 30 ° with respect to the hinge pin 21. The horizontal surface 22d is formed in a range where the angle around the hinge pin 21 is 40 °. The inclined surface 22c is formed in a range of an angle of 20 ° about the hinge pin 21.

The subsection 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. As the door 4 rotates, the top of the subsection 14d slides on the uneven portion 22 and moves up and down.

When the subsection 14d is arranged on the inclined surface 22a, the door 4 is urged to close by its own weight. Therefore, the subsection 14d and the inclined surface 22a form a first self-closing mechanism portion that urges the door 4 in the closing direction. The door of the first self-closing mechanism portion is a door in a section T1 between the first self-closing start position P2 in which the subsection 14d is arranged at the upper end of the inclined surface 22a and the closing position P0 (first self-closing end position) of the door 4. Encourage 4 Note that FIG. 5 shows a state in which the subsection 14d is arranged at the closing position P0.

When the subsection 14d is arranged on the inclined surface 22c, the door 4 is urged to open by its own weight. Therefore, the subsection 14d and the inclined surface 22c form a first opening mechanism portion that urges the door 4 in the opening direction. The door of the first opening mechanism section is in the section S1 between the first opening start position P3 in which the subsection 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. Encourage 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 are provided by driving the motor 52 (see FIG. 6). .. The second self-closing mechanism unit urges the door 4 in the 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 on the door closing side with respect to 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 portion 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 substantially matched with the second self-closing start position P4, and may be referred to as "second opening end position P4'" in the following description.

Further, a door opening / closing mechanism for opening / closing the door 4 is configured by the first self-closing mechanism portion, the second self-closing mechanism portion, the first opening mechanism portion, and the second opening mechanism portion.

A groove (not shown) for avoiding interference due to vertical movement of the door 4 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. The groove can prevent the gap between the main body 2 and the door 4 from being generated due to the vertical movement of the door 4.

Further, one of the inclined surface 14a and the inclined surface 22a that slide on each other may be formed by a vertical plane. Similarly, one of the inclined surface 14c and the inclined surface 22c that slide on each other may be formed by a vertical plane. It is more preferable that the inclined surface 14a and the inclined surface 22a are formed at the same inclination angle and the inclined surface 14c and the inclined surface 22c are formed 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 a 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) for detecting 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 slidably mounted on the support member 51 in the left-right direction.

The guide portion 60 is provided on the upper surface of the door 4 and has ribs 61 and ribs 62 that project upward. The rib 61 has a cam surface 61a (second cam surface) that inclines so as to approach the main body 2 as the distance from the pivot shaft 4c increases. The rib 62 is arranged 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 2 as the distance from the pivot shaft 4c increases.

The slider 59 is projected 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, the direction (operating direction) perpendicular to the normal line of the opening surface 3a and the pivot shaft 4c is referred to as the X direction, the normal direction of the opening surface 3a is referred to as the Y direction, and the axial direction of the pivot shaft 4c is referred to as the Z direction. In some cases. In the present 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.

When the door 4 is closed, the slider 59 is arranged at a retracted position between the rib 61 and the rib 62. Therefore, the slider 59 at the retracted position does not interfere with the guide portion 60 during the drive standby when the motor 52 is stopped, and the door 4 can be opened manually.

When a predetermined operation button is operated while the door 4 is closed, the drive unit 58 drives the door 4 to open. As shown in FIG. 7, the reduction gear 56 rotates clockwise CW in the drawing due to the door opening drive, and the slider 59 moves in the direction away from the pivot shaft 4c in the X direction (left side in the drawing). It comes into contact with the cam surface 61a of the rib 61. Further, when the slider 59 moves to the left in the drawing, the door 4 is urged in the opening direction by sliding between the slider 59 and the cam surface 61a.

As a result, as shown in FIG. 8, the follower 14d rises the inclined surface 22a against the urging force of the door 4 due to its own weight, and the door 4 is opened while rising. Further, as shown in FIG. 9, the subsection 14d slides on the horizontal plane 22d and the door 4 is opened horizontally.

As shown in FIG. 10, when the door 4 is opened by a predetermined amount, the slider 59 reaches the end (rear end) of the cam surface 61a, and the door opening drive by the drive unit 58 ends. At this time, the subsection 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 unit 58 including the slider 59 and the cam surface 61a form a second opening mechanism unit that urges the door 4 in the opening direction in the section S2.

When the door opening drive by the drive unit 58 is completed, the subsection 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. The door 4 reaches the first opening end position P5, and the subsection 14d is arranged on the horizontal plane 22e. After that, the door 4 is opened manually. As a result, the burden of opening the door 4 can be reduced.

When the detection sensor detects that the door opening drive by the drive unit 58 has been completed, the motor 52 is reversely driven and the reduction gear 56 rotates counterclockwise CCW in the figure as shown in FIG. As a result, the slider 59 moves in the direction closer to the pivot shaft 4c in the X direction (to the right in the figure) and is arranged at the retracted position, and the motor 52 is stopped.

Next, when the door 4 is manually closed from the opened state of the door 4, the subsection 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 drive 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 comes into contact with the cam surface 62a of the rib 62. Further, when the slider 59 moves to the right in the drawing, the door 4 is closed by sliding 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 door closing drive by the drive unit 58. At this time, the subsection 14d is arranged at the second self-closing end position P1 (see FIG. 5) on the door closing side of the first self-closing start position P2. Therefore, the drive unit 58 including the slider 59 and the cam surface 62a form a second self-closing mechanism unit that urges the door 4 in the closing direction in the section T2.

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

When the door closing drive by the drive unit 58 is completed, the slave section 14d slides on the inclined surface 22a, so that 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 burden of closing the door 4 can be reduced and the half-door state can be prevented.

Further, when the detection sensor detects that the door closing drive by the drive unit 58 has been completed, the motor 52 reverses. Then, the slider 59 moves in the direction away from the pivot shaft 4c in the X direction (to the left in the figure) and is arranged at the retracted position as shown in FIG. 6, and the motor 52 is stopped.

When the door 4 is manually closed to the closing position, the slider 59 is arranged at the retracted position, so that the door 4 can be closed by preventing interference between the slider 59 and the guide portion 60. 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 predetermined delay time has elapsed. Further, it may be determined by calculating the transition information of the detection sensor that the door 4 has been closed to a predetermined position, and the door 4 may be driven to close based on the determination result. Further, when the door closing speed when the door 4 passes through the second self-closing start position P4 is equal to or lower than a predetermined speed, the door 4 may be driven by the drive unit 58 to close the door. As a result, it is possible to prevent the motor 52 from being driven even though the door 4 is manually closed to the closing position.

According to the present embodiment, the first self-closing mechanism portion for urging the door 4 is provided in the section T1 between the first self-closing start position P2 and the closing position P0 (first self-closing end position). Further, 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 for urging the door 4 is provided.

Therefore, when the door 4 is closed, the door 4 can be urged in the order of the second self-closing mechanism portion and the first self-closing mechanism portion to self-close the door 4 in a wide range. Therefore, the range of self-closing when the door 4 is closed 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 door 4 in the closing direction by the second self-closing mechanism portion is released. As a result, the range of self-closing when the door 4 is opened can be easily shortened, and the opened door 4 can be prevented from being closed against the intention of the user.

Further, a first opening mechanism portion for urging the door 4 in the opening direction is provided in the section S1 on the door opening side from the first opening start position P3 near the second self-closing start position P4. As a result, the door 4 can be kept open even if a weak force is applied in the direction of closing the door 4, and when the user tries to close the door 4, the door is closed by the second self-closing mechanism. 4 can be closed reliably.

Further, the first opening start position P3 is arranged on the door closing side with respect to the second self-closing start position P4, and the door 4 is closed by the second self-closing mechanism portion against the urging force of the first opening mechanism portion. Therefore, even if the user has a weak force to close the door 4 and cannot exceed the first opening start position P3, 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 rebounding due to the urging force of the mechanical portion. 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 urge the door 4 by the weight of the door 4 by the inclined surfaces 22a and 22c (first and second inclined surfaces) and the subordinate section 14d. Can be done. Further, the second self-closing mechanism portion and the second opening mechanism portion that urge the door 4 by driving the motor 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 approach the main body 2 as the cam surface 61a approaches the pivot shaft 4c. As a result, the slider 59 moves in the direction closer to the pivot shaft 4c in the X direction to open the door 4, and moves 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 developed view of the uneven portion 22 and the subsection 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 designated by the same reference numerals. In this embodiment, the inclined surface 22a of the uneven portion 22 constituting the first self-closing mechanism portion 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 whose inclination angle with respect to the horizontal is gently switched on the door closing side of the switching position Ps between the closing position P0 and the second self-closing end position P1. Therefore, the urging force due to the weight of the door 4 of the first self-closing mechanism portion 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 speed at which the slave section 14d slides on the inclined surface 22a and closes itself is accelerated, and the acceleration is reduced by the inclined surface 22b, so that the speed at which the door 4 closes is regulated. 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 matter and the impact sound due to the impact. Further, when the fingers arranged on the front surface of the main body 2 touch the inner surface of the door 4 which is closed at a low speed, the fingers can be retracted, and finger clogging can be prevented.

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

<Third Embodiment>
Next, FIG. 16 shows a top view of the refrigerator 1 of the third embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 14 are designated by the same reference numerals. In this embodiment, the slider 59 rotates and moves, 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 ribs 63, ribs 73, and ribs 74 that project upward. The rib 63 has a cam surface 63a (second cam surface), and the rib 73 has a cam surface 73a that is symmetrical to the cam surface 63a with respect to the 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 as it approaches the main body 2 so as to move away from the pivot shaft 4c and enter the inside of the orbital circle of the slider 59. The cam surface 73a is inclined so as to approach the pivot shaft 4c as it approaches the main body 2 and enter the inside of the orbital circle of the slider 59.

Further, the rib 74 has a cam surface 74a (first cam surface) that inclines 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 are inclined in opposite directions with respect to the Y direction. Further, the cam surface 74a and the cam surface 73a are both arranged on one side (in the present embodiment, the pivot shaft 4c side) 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. It is arranged closer to the main body 2 than the surface 73a.

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

When a predetermined operation button is operated while the door 4 is closed, the drive unit 58 drives the door 4 to open. As shown in FIG. 17, the reduction gear 56 rotates clockwise CW in the drawing due to the door opening drive, and the slider 59 moves away from the pivot shaft 4c in the X direction with movement in the Y 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 rises the inclined surface 22a against the urging force due to the weight of the door 4 as shown in FIG. Then, the door 4 is opened while rising. Further, as shown in FIG. 9 described above, the subsection 14d slides on the horizontal plane 22d and the door 4 is opened 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 ends the door opening drive. At this time, the subsection 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 unit 58 including the slider 59 and the cam surface 63a form a second opening mechanism unit that urges the door 4 in the opening direction 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 described above, and the door 4 is opened by the first opening mechanism unit that biases the door 4 by its own weight. .. As a result, as shown in FIG. 18, the slider 59 is arranged at a position away from the cam surface 63a. After that, when the door 4 reaches the first opening end position P5 and the subsection 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 reversely driven, the slider 59 is arranged at the retracted position as shown in FIG. 16 described above, and the motor 52 is stopped.

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

As shown in FIG. 19, the reduction gear 56 rotates counterclockwise CCW in the drawing due to the door closing drive, and the slider 59 in the retracted position approaches the pivot shaft 4c in the X direction (to the right in the drawing). 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 subsection 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) on the door closing side of the first self-closing start position P2. Therefore, the drive unit 58 including the slider 59 and the cam surface 74a form a second self-closing mechanism unit that urges the door 4 in the closing direction in the section T2.

When the door 4 is closed to the second self-closing end position P1, the door 4 is urged in the closing direction by the first self-closing mechanism portion, and the slider 59 is separated 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 abuts on 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 the switching position Ps is not shown, it 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 weight of the door 4 to support the door 4 against the urging force of the first self-closing mechanism portion. Then, when the slider 59 is inverted and rotated clockwise CW in the drawing, the slave section 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 arranged at the retracted position shown in FIG. 16 described above.

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 of acceleration is regulated by the weight of the door 4. Therefore, the slider 59 and the cam surface 73a form a regulating 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 portion stops at the closing position P0 is alleviated. Therefore, it is possible to reduce the scattering of the stored matter and the impact sound due to the impact. Further, since the closing speed of the door 4 is restricted to a low speed, the fingers can be easily retracted 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 closing position P0, the slider 59 is arranged at the retracted position, so that the door 4 is closed by preventing interference between the slider 59 and the guide portion 60. Can be done. Further, as in the first embodiment, the driving 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, the second self-closing mechanism portion that urges the door 4 in the closing direction in the section T2 by the rotating slider 59 and the cam surface 74a can be easily realized. Further, the rotating slider 59 and the cam surface 63a can easily realize the second opening mechanism portion that urges the door 4 in the opening direction in the section S2.

Further, the speed of the door 4 by the first self-closing mechanism portion is regulated by the regulating portion formed by the slider 59 and the cam surface 73a. As a result, it is possible to reduce the scattering of the stored matter and the impact sound due to the impact when the door 4 is closed, and to prevent finger clogging.

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 with respect to the center line CL in the present embodiment.

Further, the plurality of sliders 59 may be arranged rotationally symmetrically. As a result, the slider 59 after the door opening drive can be quickly arranged at the retracted position.

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

The door 4 of the refrigerating chamber 3 has handles 4a and 4b at the left and right ends, and can be pivotally supported by the pivot shaft 4c or the pivot shaft 4d and can be opened and closed alternately from the 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 chamber 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. Similar pair of cam mechanisms 12 are provided at both left and right ends of the angle 11 and at both left and right ends of the lower surface of the door 4.

A pair of left and right cam mechanisms 12 provided on the upper and lower sides of the door 4 engages and disengages the door 4 and the main body 2 to form a double door 4. Further, a roller 18 (see FIG. 25) that rolls 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. The rear end of the horizontal portion 11h of the angle 11 is provided with an inclined surface 11a that is inclined downward at the rear, and the front end is provided with an inclined surface 11c that is inclined downward at the front. A horizontal plane 11d is provided between the upper end of the inclined surface 11a and the upper end of the inclined surface 11c.

A 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 at the rear portion of the support member 17.

When the rollers 18 are arranged on the inclined surface 11a, the door 4 is urged to close 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, the first self-closing mechanism portion 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. At T1, the door 4 is urged.

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, the door of the first opening mechanism portion is a door in the section S1 between the first opening start position P3 in which the roller 18 is arranged at the upper end of the inclined surface 11c and the first opening end position P5 arranged in the lower end. Encourage 4

FIG. 27 is a top view showing the cam mechanism 12 above the door 4, showing a state in which the door 4 is closed. Further, FIG. 28 shows a cross-sectional view taken along the line AA of FIG. 27. 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 figure) provided on the support member 10, and a groove cam 31 provided on the door 4. It includes a boss 34 and a second engaging protrusion 35.

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

The first engaging protrusion 25 is arranged between the left and right hinge pins 21. The first engaging projection 25 is provided with a cylindrical surface 25a concentric with the closer hinge pin 21 and a cylindrical surface 25b concentric with the farther hinge pin 21 facing each other.

The groove cam 31, the boss 34, and the second engaging projection 35 are integrally formed of a resin-molded cam member 30, 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 which are continuous with the hinge pin 21 engaged with the groove cam 31. The first groove portion 32 is formed by opening the main body portion 2 side and inclining so that the open end faces inward in a plane perpendicular to the pivot shafts 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 has a second groove 33 recessed and has a cylindrical surface 34a that slides on the guide surface 24a of the rib 24. Further, a relief portion 34b (see FIG. 30) for avoiding interference with the rib 24 is provided on the peripheral surface of the boss 34 at the first locking position described later. When the guide surface 24a of the rib 24 is formed of a cylindrical surface, the peripheral surface of the boss 34 may be formed by a large number of pins or protrusions. That is, a large number of pins and protrusions forming the peripheral surface of the boss 34 may be formed so as to be a cylindrical surface.

The second engaging protrusion 35 has sliding surfaces 35a and 35b that slide with the cylindrical surfaces 25a and 25b of the first engaging protrusion 25, respectively. The cam member 30 is provided with a relief groove 36 that avoids interference with the first engaging protrusion 25 so as to be recessed around the second engaging 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 projecting upward. The ribs 63, 73 and 74 are formed in the same manner as in the third embodiment. The rib 64 is formed symmetrically 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 drawing by driving the drive unit 58, the slider 59 slides on the cam surface 63a on the left side in the drawing. At this time, the door 4 is pivotally supported by the right pivot shaft 4c and rotates. Further, when the reduction gear 56 is rotated counterclockwise CCW in the drawing by driving the drive unit 58, the slider 59 slides on the cam surface 73a on the right side in the drawing. At this time, the door 4 is pivotally supported by the left pivot shaft 4d and rotates.

Next, a case where the door 4 is opened and closed from the right side will be described as an example. The same applies when the door 4 is opened and closed from the left side. When the door 4 is closed, the cam mechanisms 12 on both sides are arranged at the first locking position shown in FIG. 27. 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 relief 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 a 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 the present 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 do not have to 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 the door 4 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 (to the right in the figure) with 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 drawing.

As a result, the hinge pin 21 engaged with the groove cam 31 on the left side moves relative 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 both hinge pins 21 is constant, when the left hinge pin 21 moves relative to the outside, the right hinge pin 21 moves inward. The open end of the first groove 32 is inclined toward the inside of the door 4, and the hinge pin 21 on the right side moves inward so that the engagement guide of the first groove 32 is directed toward the open end of the first groove 32. Move relative to each other. Therefore, the door 4 slides from the left pivot shaft 4d side to the right open side while rotating, 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 raises the inclined surface 11a (see FIG. 25) against the urging force due to the weight of the door 4 and the door 4 Is opened while rising. Further, the roller 18 slides on the horizontal plane 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 engagement of the hinge pin 21 with the second groove 33 restricts the movement of the door 4 in the substantially front-rear direction, and the engagement between the boss 34 and the rib 24 restricts the movement of the door 4 in the substantially left-right direction. NS. Therefore, the cam mechanism 12 slides and restricts 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 and the second engaging projection of the first engaging projection 25 on the left side slide. The sliding surface 35a of 35 slides. As a result, the door 4 can be rotated more stably.

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

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

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, as shown in FIG. 33, the slider 59 is arranged at a position away from the cam surface 73a. 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 plane 11d, the door 4 is sufficiently opened and the door 4 can be easily opened manually. can. When the door opening drive by the drive unit 58 is completed, the motor 52 is reversely driven, the slider 59 is arranged at the retracted position, and the motor 52 is stopped.

Next, when the door 4 is closed, the left and right cam mechanisms 12 operate in the reverse manner to the above. When the door 4 is manually closed from the opened 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 has been closed to the second self-closing start position P4 (see FIG. 5), the drive unit 58 drives the door 4 to close.

As shown in FIG. 34, the reduction gear 56 rotates clockwise CW in the drawing due to the door closing drive, and the slider 59 in the retracted position moves in the direction approaching the pivot shaft 4d in the X direction (to the right in the drawing). 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 on the door closing side of the first self-closing start position P2. Therefore, the drive unit 58 including the slider 59 and the cam surface 64a form a second self-closing mechanism unit 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 unit 58 including the slider 59 and the cam surface 74a form a second self-closing mechanism unit.

When the door 4 is closed to the second self-closing end position P1, the door 4 is urged in the closing direction by the first self-closing mechanism portion, and the slider 59 is separated 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 abuts on 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 urging force of the first self-closing mechanism portion, and the closing speed of the door 4 is regulated. Then, in the drawing of the slider 59, the door 4 is guided in the closing direction by the rotation of the counterclockwise CCW, and the door 4 is closed as shown in FIG. 37. Therefore, the slider 59 and the cam surface 63a form a regulating 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, a regulating portion that regulates the closing speed of the door 4 by the first self-closing mechanism portion is formed by the slider 59 and the cam surface 73a. 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 restricting 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 forms a restricting portion when the door 4 is opened from the right. Therefore, it is possible to standardize the parts and reduce the cost.

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 engaging protrusion 25 may be provided on the door 4, and the second engaging protrusion 35 may be provided on the main body 2.

In the first to fourth embodiments, the first self-closing mechanism portion and the first opening mechanism portion 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 and the second opening mechanism urge the door 4 by driving the motor 52, but the door 4 is attached when the door 4 moves in one direction due to an elastic body having a ratchet mechanism or the like. You may release the urging force when moving in the other direction.

Further, a first self-closing mechanism, a first opening mechanism, a second self-closing mechanism, and a second opening mechanism are provided for the rotating door 4, but the first is for the sliding door 4. A self-closing mechanism, a first opening mechanism, a second self-closing mechanism, and a second opening mechanism may be provided.

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

1 Refrigerator 2 Main body 3 Refrigerator room 3a Opening surface 4, 6, 8 Door 4a Handle 4c, 4d Pivot shaft 5 Freezing room 6 Vegetable room 9 Insulation wall 10, 17, 51 Support member 11 Angle 11a, 11c Inclined surface 11d Horizontal plane 12 Cam mechanism 14 Bearing part 14a, 14c Inclined surface 14d Follower 18 Roller 21 Hinge pin 22 Concavo-convex part 22a, 22b, 22c Inclined surface 22d, 22e Horizontal surface 24 Rib 25 First engaging protrusion 30 Cam member 31 Groove cam 32 First groove 33 2nd groove 34 Boss 35 2nd engagement protrusion 36 Relief groove 50 Door opening / closing device 52 Motor 53 Warm 54 Warm 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 Closing position (first self-closing end position)
P1 2nd self-closing end position P2 1st self-closing start position P3 1st opening start position P4 2nd self-closing start position P4'2nd opening end position P5 1st 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 for opening / closing the opening surface, the door is between a predetermined first self-closing start position and a first self-closing end position where the door is closed. The first self-closing mechanism that urges the door to close, and the second self-closing mechanism on the door opening side of the first self-closing start position to the second self-closing mechanism on the door closing side of the first self-closing start position. A door opening / closing mechanism including a second self-closing mechanism portion that urges the door to close in the direction of closing the door up to the self-closing end position. The door opening / closing mechanism according to claim 1, wherein when the door is opened, the urging of the second self-closing mechanism portion in the closing direction is released. 2. The door opening and closing mechanism described. The urging force by the first self-closing mechanism portion between the switching position on the door closing side and the first self-closing end position with respect to the second 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 force is smaller than the urging force of the first self-closing mechanism portion between the two. The door is provided with a regulating unit that regulates 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. The pivot shaft is arranged at both ends of the door so that the door can be selectively opened and closed from both ends, and a pair of second opening mechanisms for urging the door from the first self-closing end position in the direction of opening the door. 5. The second opening mechanism portion, which comprises a portion and urges the door when one of the doors is opened, forms the restricting portion when the door is closed from the other. The door opening and closing mechanism described. A slider provided on the main body and rotated by driving a motor, and a pair of first cam surfaces and a pair of second cam surfaces provided on the door and sliding on the slider are provided.
The second self-closing mechanism that closes the door from one side is formed by the slider and one of the first cam surfaces, and the second opening mechanism that opens one of the doors is formed by the slider and the first cam surface. Formed by one of the second cam surfaces,
The second self-closing mechanism portion that closes the door from the other is formed by the slider and the first cam surface of the other, and the second opening mechanism portion that opens the other of the door is formed by the slider and the other. 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 is separated from the first cam surface, and the switching position. The door opening / closing mechanism according to claim 6, wherein the door opening / closing mechanism rotates in the opposite direction of the predetermined direction and slides on the other second cam surface forming the regulation portion.

Images