CN112384740B

CN112384740B - Door opening and closing mechanism and refrigerator

Info

Publication number: CN112384740B
Application number: CN201980044611.7A
Authority: CN
Inventors: 长谷川勇也; 中村英介
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2018-07-13
Filing date: 2019-07-08
Publication date: 2022-06-14
Anticipated expiration: 2039-07-08
Also published as: TW202006301A; JP7305640B2; CN112384740A; TWI803660B; JPWO2020013115A1; WO2020013115A1

Abstract

A door opening and closing mechanism which can be operated by a lighter handle and can open and close doors by two sides and a refrigerator are provided. When the door (2a) is in a closed state, the rotating shaft pins (11) and the slot cams (24, 25) of the cam mechanisms on both sides are in a first locking position, when one handle is operated, the cam lever (31) corresponding to the operated handle rotates backward to press the locking outer cam (12) so that the door (2a) moves to the opened side, the rotating shaft pins (11) and the slot cams (24, 25) of the cam mechanisms on the opposite side to the opened side are in a second locking position capable of rotating freely, and the cam lever (31) presses the opened side of the front end part of the locking outer cam (12) when at least the rotation starting action in the rotation action for opening the door (2 a).

Description

Door opening and closing mechanism and refrigerator

Technical Field

The invention relates to a door opening and closing mechanism capable of opening and closing doors from two sides and a refrigerator.

Background

The inventor of the present invention provides a refrigerator with a door openable and closable by both sides to the market. Such a refrigerator includes a door opening and closing mechanism for opening and closing the door from both sides. The door opening and closing mechanism includes cam mechanisms for engaging and disengaging the door with and from the body, a handle for grasping when opening the door, and a cam lever (cam lever) that rotates in conjunction with the handle. The cam mechanism includes a pivot pin (hinge pin), a slot cam, a lock outer cam disposed on the body, and a slide outer cam disposed on the door.

In the closed state of the door, the rotating shaft pin and the slot cam of the cam mechanisms on both sides are in the first clamping position. The first locking position is a state in which the rotation shaft pin is in the middle of the slot cam and the rotation shaft pin does not enter the end portion of the slot cam.

When the handle on the door opening side is operated, the cam lever corresponding to the operated handle rotates backward to press the lock outer cam and move to the door opening side, and the rotating shaft pin and the slot cam of the cam mechanism on the opposite side to the door opening side are at the second locking position capable of rotating freely. The second locking position is a state in which the rotating shaft pin has entered the end of the slot cam.

As a start operation required for opening the door, an operation of sliding the door is performed during an operation of opening the door by holding the handle (for example, patent document 1).

Documents of the prior art

Patent literature

Patent document 1: japanese patent publication No. 3761560 Specification "

Disclosure of Invention

Technical problem to be solved by the invention

The present invention is to further improve the door opening and closing mechanism of the door which can be opened and closed from two sides. In the door opening and closing mechanism disclosed in patent document 1, the cam rods are arranged in parallel in the left-right direction, and the pressing surface that presses the lock outer cam when the rotation of the opening door starts to operate is formed as a flat surface.

In such a configuration, the sliding movement of the door to the open side, which is required for starting the door opening operation, is performed by applying a reaction force to the slot cam, which is a force by which the cam lever presses the lock outer cam backward, that is, a force toward the front to the slot cam, and a force which is a component of the force in the direction in which the slot cam extends. Therefore, when the direction of the reaction force is separated from the direction in which the door is intended to slide, the reaction force may not be effectively utilized, and the handle may be heavy.

An object of one aspect of the present invention is to provide a door opening and closing mechanism that can open and close doors on both sides by a lighter handle operation, and a refrigerator.

Means for solving the problems

In order to solve the above-mentioned problem, a door opening and closing mechanism according to an aspect of the present invention is a door opening and closing mechanism that opens and closes a door from both sides, including: a cam mechanism for engaging and disengaging the door with and from the body; a handle to be held when the door is opened; and a cam lever that rotates in conjunction with the handle; the cam mechanism comprises a rotating shaft pin and a groove cam, a locking outer cam arranged on the body and a sliding outer cam arranged on the door, wherein in the closed state of the door, the rotating shaft pin and the groove cam of the cam mechanism on two sides are in a first clamping position, if one handle is operated, a cam rod corresponding to the operated handle rotates backwards to press the locking outer cam so that the door moves to the opened side, and the rotating shaft pin and the groove cam of the cam mechanism on the opposite side to the opened side are in a second clamping position which can rotate freely; the cam lever presses the open side of the front end portion of the lock outer cam at least at the time of a rotation start operation of the rotation operation for opening the door.

Effects of the invention

According to an aspect of the present invention, it is possible to provide a door opening and closing mechanism and a refrigerator, in which a door can be opened and closed on both sides by a lighter handle operation.

Drawings

Fig. 1 is a front view showing a refrigerator including a door opening and closing mechanism of a first embodiment.

Fig. 2 is a front view showing a right half of a rotation shaft angle disposed at a lower portion of a main body portion side of the refrigerating chamber of the refrigerator shown in fig. 1.

Fig. 3 is a plan view showing a right half of a rotating shaft angle disposed at a lower portion of a main body portion side of the refrigerating chamber of the refrigerator shown in fig. 1.

Fig. 4 is a plan view showing an engagement relationship between a slide cam member provided on the right side of the lower end of the door of the refrigerating compartment of the refrigerator shown in fig. 1 and a rotating shaft angle iron.

Fig. 5 is a side sectional view showing a rotation shaft angle iron and a roller provided on the lower surface of a door, which are disposed at the lower portion of the refrigerator shown in fig. 1 on the side of the main body of the refrigerating chamber.

Fig. 6 is a front sectional view showing a rotation shaft angle iron and a roller provided on the lower surface of a door, which are arranged on the lower portion of the refrigerating chamber of the refrigerator shown in fig. 1 on the side of the main body.

Fig. 7 is a diagram showing a relative positional relationship between a rotation shaft angle and a slide cam portion when a door of a refrigerating compartment of the refrigerator shown in fig. 1 is opened from the right side.

Fig. 8(a) is an enlarged view of the right end portion of fig. 7, showing the application of force when the cam lever starts to press the lock outer cam (when the rotation starts to operate), and (b) shows the application of force when the cam lever of the door opening and closing mechanism starts to press the lock outer cam.

Fig. 9 is a diagram showing a relative positional relationship between the rotation shaft angle and the slide cam portion when the door of the refrigerating compartment of the refrigerator shown in fig. 1 is opened from the right side.

Fig. 10 is a diagram showing a relative positional relationship between the rotation shaft angle and the slide cam portion when the door of the refrigerating compartment of the refrigerator shown in fig. 1 is opened from the right side.

Fig. 11 is a diagram showing a relative positional relationship between a rotation shaft angle and a slide cam portion when a door of a refrigerating compartment of the refrigerator shown in fig. 1 is opened from the right side.

Fig. 12 is a plan view showing an engagement relationship between a slide cam portion provided on the right side of the lower end of the door 2a of the refrigerating compartment of the refrigerator including the door opening and closing mechanism of the second embodiment and the rotating shaft angle iron.

Fig. 13 is a diagram showing a relative positional relationship between the slide cam portion and the rotation shaft angle when the door of the refrigerating compartment of the refrigerator including the door opening and closing mechanism of the second embodiment is opened from the right side.

Fig. 14 is a view showing a relative positional relationship between the slide cam portion and the rotation shaft angle when the door of the refrigerating compartment of the refrigerator including the door opening and closing mechanism of the second embodiment is opened from the right side.

Fig. 15 is a view showing a relative positional relationship between the slide cam portion and the rotation shaft angle when the door of the refrigerating compartment of the refrigerator including the door opening and closing mechanism of the second embodiment is opened from the right side.

Fig. 16 is a diagram showing a relative positional relationship between the slide cam portion and the rotation shaft angle when the door of the refrigerating compartment of the refrigerator including the door opening and closing mechanism of the second embodiment is opened from the right side.

Detailed Description

[ first embodiment ]

Embodiments of the present invention are illustrated and described below with reference to the drawings.

Fig. 1 is a front view showing a refrigerator including a door opening and closing mechanism of a first embodiment. As shown in fig. 1, a refrigerator 1 includes a refrigerating compartment 2 in an upper stage, and a vegetable compartment 3 and a freezing compartment 4 arranged in a left-right direction in a lower stage. The refrigerator 2 is configured such that an opening of a main body 6 (see fig. 4) is covered with doors 2a that can be opened and closed on both sides, and can be opened and closed from both sides by operating handles 5 provided symmetrically on both sides.

Fig. 2 is a front view showing a right half of a shaft angle 10 disposed at a lower portion of the refrigerating compartment 2 on the side of the main body 6 (see fig. 4), and fig. 3 is a plan view thereof. The shaft angle 10 is formed symmetrically with respect to the left and right of a metal such as a galvanized steel sheet, and is fastened and fixed to the main body 6. In the pivot angle 10, pivot pins 11 and lock outer cams 12 made of stainless steel or the like are provided in bilateral symmetry by caulking.

A shaft cover 10a is provided on the upper surface of the shaft angle 10 by insert molding. The pivot pin 11 serves as a pivot shaft of the door 2a, and an arc-shaped rib 13 concentric with the pivot pin 11 is formed integrally with the pivot cover 10 a. The lock outer cam 12 is disposed at a predetermined distance from the rotation shaft pin 11, and slides on a slide outer cam 22 (see fig. 4) provided on the door 2a side to guide the door 2 a.

Fig. 4 is a plan view showing the engagement relationship between the slide cam portion 20 provided on the right side of the lower end of the door 2a and the pivot angle 10. The slide cam portions 20 are provided symmetrically at the left and right ends of the door 2 a. A first grooved cam 24 and a second grooved cam 25 which are continuous in a substantially L shape and which relatively slide-guide the roller pin 11 are recessed in the end portion of the slide cam portion 20. The first slot cam 24 is guided in a direction to disengage from the rotation shaft pin 11. The second groove cam 25 is guided from the first locking position to the first groove cam 24 or to a second locking position where the rotation shaft pin 11 functions as a rotation shaft.

Around the second grooved cam 25, a projection 23 that slides with the rib 13 is provided in a protruding manner. The groove 21 is recessed to the left of the first and second

grooved cams

24 and 25. In the groove portion 21, a slide outer cam 22 is provided so as to project and oppose the lock outer cam 12 of the rotation shaft angle 10 provided on the main body portion 6 side. Thereby, the slide cam portion 20 and the rotation shaft angle 10 are engaged with each other to constitute a cam mechanism for guiding the door 2 a. In the same drawing, the above-described respective configurations of the slide cam portion 20 are provided on the lower surface, but are shown by solid lines for convenience.

The slide cam portion 20 is also provided on the upper surface of the door 2a in bilateral symmetry, and a rotating shaft pin 11, a lock outer cam 12, and a rib 13 that engage with the slide cam portion 20 are provided above the main body portion 6.

A cam lever 31 is disposed in a groove 21 of the slide cam portion 20 disposed on the lower surface of the door 2 a. The cam lever 31 is disposed opposite to the lock outer cam 12 and rotates about a shaft 32 as a rotation center. The shaft 32 is coupled to the handle 5 (see fig. 1), and when the handle 5 (in this case, the right handle) is pulled forward, the cam lever 31 rotates backward (toward the main body 6), and the cam lever 31 presses the lock outer cam 12. Thereby, the door 2a is separated from the periphery of the opening of the refrigerating compartment 2.

In the present embodiment, it should be noted that the convex portion 40 is provided on the pressing surface 31a of the cam rod 31 that presses the lock outer cam 12. As will be described in detail later, the projection 40 assists the door 2a to slide to the opened side, which is necessary for starting the door 2a to be opened.

A roller 18 (see fig. 5 and 6) that rolls on the shaft angle 10 is provided at the center of the lower surface of the door 2 a. Fig. 5 is a side sectional view of the roller 18 provided on the lower surface of the rotating shaft angle 10 and the door 2a, and fig. 6 is an elevation sectional view thereof.

As shown in fig. 5 and 6, a rear end portion of the shaft angle 10 is provided with a rear downward inclined surface 10b, and a front end portion thereof is provided with a front downward inclined surface 10 c. A horizontal surface 10d is provided between the upper end of the inclined surface 10b and the upper end of the inclined surface 10 c.

A plurality of rollers 18 having rotation shafts disposed on the left and right sides are pivotally supported on the lower surface of the door 2 a. When the roller 18 is disposed on the inclined surface 10b, the door 2a is biased in the closing direction by its own weight. When the roller 18 is disposed on the inclined surface 10c, the door 2a is biased in the opening direction by its own weight.

Next, the operation of each part when the door 2a is opened will be described with reference to fig. 7 to 11. Fig. 7, 9 to 11 are views showing relative positional relationships between the pivot angle 10 and the slide cam portion 20 when the door 2a is opened from the right side. Fig. 8(a) is an enlarged view of the right end portion of fig. 7, and shows the application of force when the cam lever 31 starts to press the lock outer cam 12 (when the rotation starts to operate). Fig. 8 (b) shows the application of force when the cam lever 100 of the conventional door opening and closing mechanism (door opening and closing mechanism described in patent document 1) starts to press the lock outer cam 12. The cam lever 100 is formed such that a pressing surface 100a for pressing the lock outer cam 12 at the time of the rotation start operation is a flat surface. In fig. 8 (b), the same reference numerals are given to members having the same functions as those of the door opening and closing mechanism of the present embodiment for convenience.

Fig. 7 shows a relative positional relationship of the closed state of the door 2 a. The cam mechanisms on both sides, which are composed of the rotation shaft angle 10 and the left and right slide cam portions 20, are respectively located at the first locking positions. The first grooved cams 24 provided in the left and right slide cam portions 20 are formed so as to face the inclined inner sides of the doors 2a, respectively, and the guide roller pins 11 are not slid simultaneously on both the left and right first grooved cams 24. Therefore, even if the door 2a in the closed state is simultaneously pulled out to the front from both the left and right sides, the door 2a does not fall off from the main body portion 6.

As shown in fig. 8(a), in the closed state of the door 2a, the right side of the front tip portion of the lock outer cam 12 is in contact with or close to the left inclined surface 40a of the convex portion 40 provided on the pressing surface 31a of the cam lever 31. Here, the left inclined surface 40a of the projection 40 is an inclined surface on the opposite side (the center side of the door 2a) from the side where the door 2a is opened by rotation of the cam lever 31, and the right side of the front end portion of the lock outer cam 12 is the side where the door 2a is opened by rotation of the cam lever 31.

When the right grip 5 (see fig. 1) is slightly pulled forward from the state shown in fig. 7 (fig. 8 a), the cam lever 31 rotates rearward (toward the main body 6), and the left inclined surface 40a of the projection 40 of the cam lever 31 presses rearward the right side of the front end portion of the lock outer cam 12. An arrow X1 of fig. 8(a) indicates the direction of the force applied to the door 2a via the lock outer cam 12 at this time.

The right side of the front end portion of the lock outer cam 12 is pressed rearward by using the left inclined surface 40a of the convex portion 40 of the cam lever 31, whereby the front of the lock outer cam 12 can be pressed from obliquely right forward. As a result, a force acts on the door 2a as if the door 2a were moved forward to the right (the force indicated by arrow Y1 in fig. 8 (a)) as a reaction force. The reaction force is represented by an arrow a1, which moves the door 2a to the right, which is the open side, in the extending direction of the second slot cam 25.

By obtaining the reaction force indicated by the arrow Y1, a force (arrow a1) is applied to slide the door 2a to the opened side, which is necessary for starting the opening operation of the door 2 a. As a result, the right-side pivot pin 11 is easily moved to the first grooved cam 24 of the right-side slide cam portion 20. At the same time, since the left slide cam portion 20 is also pulled rightward, the left pivot pin 11 moves toward the end along the left second grooved cam 25.

In contrast, in the case of the door opening and closing mechanism disclosed in patent document 1, as shown in fig. 8 (b), the pressing surface 100a of the cam lever 100 presses the front end portion of the lock outer cam 12 rearward, whereby a force indicated by an arrow X2 is applied to the door 2a, and a force indicated by an arrow Y2 is obtained as a reaction force thereof. Of the reaction forces indicated by the arrow Y2, the force for moving the door 2a to the open side, i.e., to the right along the extending direction of the second slot cam 25 is indicated by an arrow a 2.

As can be seen by comparing the arrow a1 in fig. 8 a with the arrow a2 in fig. 8 b, by providing the convex portion 40 on the pressing surface 31a of the cam lever 31, even if the force received by the lock outer cam 12 from the cam lever 31 (the force of the arrow X1 in fig. 8 a) is the same as the force received by the lock outer cam 12 from the cam lever 100 (the force of the arrow X2 in fig. 8 b), the ratio of the force moving the door 4 to the open side, that is, to the right can be increased.

Fig. 9 shows a state in which the right side of the door 2a is opened by 0.5 ° from the closed state of the door 2a shown in fig. 7 (fig. 8). By pressing the right side of the front end portion of the lock outer cam 12 rearward using the left inclined surface 40a of the convex portion 40 of the cam lever 31, the door 2a is smoothly moved to the state shown in fig. 9 by a smaller force than the door opening and closing mechanism of patent document 1. The state shown in fig. 9 is a state in which the first grooved cam 24 of the right slide cam portion 20 is moved diagonally forward to the right along the outer periphery of the right pivot pin 11, and the second grooved cam 25 of the left slide cam portion 20 is moved diagonally rearward to the right along the outer periphery of the left pivot pin 11.

Fig. 10 shows a state in which the handle 5 is further pulled forward from the state of the door 2a shown in fig. 9, and the right side of the door 2a is opened by 1.5 °. When the front end portion of the lock outer cam 12 is further pressed rearward by the right cam lever 31, the first grooved cam 24 of the right slide cam portion 20 further moves diagonally rightward and forward along the outer periphery of the right pivot pin 11. At the same time, the second grooved cam 25 of the left slide cam portion 20 also moves further rearward diagonally to the right along the outer periphery of the left pivot pin 11, and the left slide cam portion 20 is in the second locking position. In addition, the right slide outer cam 22 slides with the lock outer cam 12.

Fig. 11 shows a state in which the handle 5 is further pulled forward from the state of the door 2a shown in fig. 10, and the right side of the door 2a is opened by 2.0 °. When the handle 5 is pulled further from the state shown in fig. 10, the right cam lever 31 presses the front end portion of the lock outer cam 12 further rearward, whereby the right slide outer cam 22 and the lock outer cam 12 slide. Thereby, the door 2a is rotated forward with the pivot pin 11 of the cam mechanism of the slide cam portion 20 on the left side of the second locking position as a fulcrum.

In the present embodiment, as shown in fig. 4 and the like, the cam rod 31 is raised in the direction in which the pressing surface 31a on the distal end side of the cam rod presses, and as a result, the distal end side of the cam rod is bent so as to be positioned further rearward. With such a configuration, when the length of the cam rod from the rotation center (the center of the shaft 32) to the tip is the same, the lock outer cam 12 can be pressed by the same rotation angle length as compared with a configuration in which the pressing surface is a flat surface and is inclined in the direction opposite to the pressing direction. Accordingly, the door 2a can be moved until the roller 18 provided on the lower surface is positioned on the horizontal surface 10d, preferably, until the roller is positioned on the inclined surface 10c that biases the door in the opening direction by its own weight, and even if the force for pulling the door 2a by holding the handle 5 is reduced, the door 2a can be reliably opened.

At this time, as shown in fig. 11, when the front end side of the cam lever 31 presses the side opposite to the side where the front end portion of the lock outer cam 12 is opened (the left side in fig. 11), the force to move the door 2a to the right side becomes weak. However, as shown in fig. 11, since the left slide cam portion 20 of the door 2a is already at the second locking position and is in a rotatable state with the left pivot pin 11 as a fulcrum, a force for moving the door 2a to the right side is not required.

As described above, according to the above configuration, the cam lever 31 presses the open side of the front end portion of the lock outer cam at the time of the rotation start operation for the rotation operation for opening the door 2 a. Specifically, the convex portion 40 is formed on the pressing surface 31a of the cam lever 31, and the left inclined surface 40a, which is an inclined surface opposite to the side on which the convex portion 40 opens, presses the side on which the front tip portion of the lock outer cam 12 opens at the time of the rotation start operation.

Thus, the front side of the lock outer cam 12 can be pressed from the diagonally front side on the open side, and a force acting on the door 2a to move the door 2a forward on the open side is applied as a reaction force to the pressing, and a force to slide the door 2a to the open side, which is necessary for starting the door opening operation, can be applied. In other words, a partial force component of the force applied to the door 2a by the pressing of the cam lever 31 moves the pivot pin 11 of the cam mechanism on the open side to the first slot cam 24, and also acts to move the pivot pin 11 of the cam mechanism on the opposite side to the open side and the second slot cam 25 to the second locking position. As a result, the sliding movement of the door 2a required as the start operation when the door is opened can be easily and reliably performed, and a favorable door opening and closing mechanism capable of performing a door opening operation of opening and closing the door from both sides by a lighter handle operation can be realized.

Further, the above configuration has advantages of: the above-described effects can be obtained only by replacing the cam lever of the prior configuration with the cam lever 31.

[ second embodiment ]

A second embodiment of the present invention will be described below. For convenience of explanation, the same reference numerals are given to members already described in the above embodiments and members having the same functions, and the description thereof will not be repeated.

Fig. 12 is a plan view showing the engagement relationship between the slide cam portion 20 provided on the right side of the lower end of the door 2a' of the refrigerating compartment of the refrigerator including the door opening and closing mechanism of the second embodiment and the rotation shaft angle 10. As shown in fig. 12, a cam lever 42 is included instead of the cam lever 31. In the cam lever 42, the shaft 32 as the rotation center is located on the center side of the door 2a' with respect to the lock outer cam 12. A projection 43 is provided at the tip of a pressing surface 42a of the cam lever 42 that presses the lock outer cam 12. The projection 43 assists the sliding movement of the door 2a 'to the opened side, which is necessary for starting the opening operation of the door 2a', similarly to the projection 40.

Fig. 13 to 16 are views showing relative positional relationships between the pivot angle 10 and the slide cam portion 20 when the door 2a' is opened from the right side.

Fig. 13 is a relative positional relationship showing a closed state of the door 2 a'. Fig. 12 is also an enlarged view of the right end portion of fig. 13. As shown in fig. 12 and 13, in the closed state of the door 2a', the right side of the front tip portion of the lock outer cam 12 is in contact with or close to the left inclined surface 43a of the convex portion 43 provided on the pressing surface 42a of the cam lever 42. Here, the left inclined surface 43a of the projection 43 is an inclined surface on the opposite side (the center side of the door 2a ') to the side where the door 2a ' is opened by the rotation of the cam lever 42, and the right side of the front tip portion of the lock outer cam 12 is the side where the door 2a ' is opened by the rotation of the cam lever 42.

When the right grip 5 is pulled slightly forward from the state shown in fig. 13 (fig. 12), the cam lever 42 rotates rearward (toward the main body 6), and the left inclined surface 43a of the projection 43 of the cam lever 42 presses rearward the right side of the front end of the lock outer cam 12. An arrow X1 in fig. 12 indicates the direction of the force applied to the door 2a 'via the lock outer cam 12 at this time, and in this reaction force (the force of the arrow Y1 in fig. 12), an arrow a1 indicates the force that moves the door 2a' to the open side, i.e., the right side, in the extending direction of the second groove cam 25.

As described above, similarly to the cam lever 31 of the door opening and closing mechanism of the first embodiment, the cam lever 42 presses the open side of the front end portion of the lock outer cam 12 at the time of the rotation start operation of the rotation operation at the time of opening the door 2a ', and applies a force for sliding the door 2a' to the open side thereof, which is necessary for the start operation at the time of opening the door, with the reaction force. As a result, the sliding movement of the door 2a required as the start operation when the door is opened can be easily and reliably performed, and a favorable door opening and closing mechanism capable of performing a door opening operation of opening and closing the door from both sides by a lighter handle operation can be realized.

Fig. 14 is a view showing a state where the door 2a 'is opened by 0.5 ° from the right side of the closed state of the door 2a' shown in fig. 13 (fig. 12), and corresponds to fig. 9 of the first embodiment. Fig. 15 is a view showing a state in which the handle 5 is further pulled forward from the state of the door 2a 'shown in fig. 14 and the right side of the door 2a' is opened by 1.5 °, which corresponds to fig. 10 of the first embodiment. Fig. 16 is a view showing a state in which the handle 5 is further pulled forward from the state of the door 2a 'shown in fig. 15 and the right side of the door 2a' is opened by 2.0 °, which corresponds to fig. 11 of the first embodiment.

In such a configuration, as shown in fig. 13 to 15, the cam rod 42 moves toward the front end side along with the rotational pressing surface 42a, and presses the right side of the front end portion of the lock outer cam 12 rearward. Further, the right side of the front end portion of the lock outer cam 12 is pressed rearward by the convex portion 43 provided on the pressing surface 42a when the rotation of the cam lever 42 starts to operate. That is, in the initial stage of the rotation of the cam lever 42, a force to move the door 2a' to the opened side, that is, to the right side by the reaction force is always included. Therefore, the sliding movement of the door 2a' required as the start operation at the time of opening the door can be more easily and surely performed, and a favorable door opening and closing mechanism capable of opening and closing the door by both sides by a lighter handle operation can be realized.

In fig. 15 to 16, the top of the convex portion 43 of the pressing surface 42a presses the front end portion of the lock outer cam 12 rearward. In the state of fig. 15, similarly to fig. 10 of the first embodiment, since the left slide cam portion 20 is positioned at the second locking position, a force for sliding the door 2a' to the right side is not required. In this way, the tip of the pressing surface 42a of the cam lever 42 is shaped so that the tip thereof abuts the front tip of the lock outer cam 12, instead of the left inclined surface 43a of the convex portion 43, in each stage when the door is opened, thereby applying the force in the most appropriate direction to the front tip of the lock outer cam 12.

In the present embodiment, the mechanism for rotating the cam lever 42 in conjunction with the handle 5 is larger than that of the first embodiment, but the door opening operation can be more preferable, and the present invention is suitable for a large, thick and heavy door, for example.

[ third embodiment ]

A third embodiment of the present invention will be described below. For convenience of explanation, the same reference numerals are given to the components already described in the above embodiments and the components having the same functions, and the description thereof will not be repeated.

In the door opening and closing mechanism of the first embodiment, the initial position (door closing position) of the cam lever 31 is disposed in parallel to the opening surface of the main body 6, and the operation handle 5 is configured to be rotated rearward from the initial position. The cam lever 31 is disposed on the front side of the door 2 a. By disposing the cam rod 31 in this manner, the heat insulating material can be filled in a sufficient thickness in the rear portion of the cam rod 31, and sufficient heat insulation can be ensured.

However, although the heat insulation performance is slightly poor, the inclined surface on the side of opening the front end portion of the pressing lock outer cam 12 can be formed without providing the convex portion 40 or the like on the pressing surface 31a of the cam lever 31 by moving the rotation shaft of the cam lever rearward (toward the main body portion 6) and disposing the initial position of the cam lever so as to be inclined with respect to the opening surface of the main body portion 6. In the door opening and closing mechanism of the present embodiment, the cam lever has a shape that is inclined from the rear to the front as the pressing surface is pressed from the end portion of the door toward the center portion, such that the cam lever is disposed inclined with the rear as the rotation axis.

In such a configuration, similarly to the door opening and closing mechanism of the first and second embodiments, the cam lever 31 presses the open side of the front end portion of the lock outer cam at the time of the rotation start operation for opening the rotation operation of the door 2 a. In the present embodiment, since the pressing surface 31a approaches the opening surface of the main body 6 in parallel with the rotation of the cam lever 31, the open side of the front end portion of the lock outer cam is pressed at the time of the start of the rotation, and the front end portion of the lock outer cam is pressed rearward as the rotation progresses, so that the force in the most suitable direction can be applied to the front end portion of the lock outer cam 12 at each stage of the door opening.

[ conclusion ]

The door opening and closing mechanism of claim 1 of the present invention is a door opening and closing mechanism which can open and close a door from both sides, and includes: a cam mechanism for engaging and disengaging the door with and from the body; a handle 5 to be held when the door is opened; and a cam lever 31 that rotates in conjunction with the handle; wherein the cam mechanism has a rotating shaft pin and a slot cam (a first slot cam, a second slot cam), a lock outer cam 12 arranged on the body (the body part 6), and a slide outer cam 22 arranged on the door, the rotating shaft pin and the slot cam of the cam mechanism on both sides are positioned at a first locking position in the closed state of the door, if one handle is operated, a cam lever corresponding to the operated handle rotates backward to press the lock outer cam so that the door moves to the opened side, and the rotating shaft pin and the slot cam of the cam mechanism on the opposite side to the opened side are positioned at a second locking position which can rotate freely; the cam lever presses the open side of the front end portion of the lock outer cam at least at the time of a rotation start operation for opening the door.

In the door opening and closing mechanism of claim 2 of the present invention, in claim 1, the cam lever has a convex portion 40 on a pressing surface that presses the lock outer cam, and an inclined surface (left inclined surface 40a) opposite to a side on which the convex portion is opened presses the side on which the front end portion of the lock outer cam is opened.

In the door opening and closing mechanism according to claim 3 of the present invention, in claim 2, the pressing surface on the distal end side of the cam rod may be configured to be raised in the pressing direction.

In the door opening and closing mechanism according to claim 4 of the present invention according to claim 2, the rotation shaft of the cam lever may be positioned on the center side of the door with respect to the lock outer cam pressed.

The refrigerator of claim 5 of the present invention includes: the door opening and closing mechanism according to any one of claims 1 to 4.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention. Further, by combining the technical methods disclosed in the respective embodiments, new technical features can be formed.

Description of the reference numerals

1 … refrigerator; 2 … a refrigerating chamber; 3 … vegetable room; 4 … freezing chamber; 5 … a handle; 6 … body part (body); 10 … corner iron of the rotating shaft; 10a … pivot cover; 10b, 10c … inclined faces; 10d … horizontal plane; 11 … pivot pin; 12 … locking the outer cam; 13 … ribs; 18 … roller; 20 … sliding cam part; 21 … groove part; 22 … sliding the outer cam; 23 … protrusions; 24 … first slot cam; 25 … second slot cam; 31. 42 … cam lever; 31a, 42a … pressing surface; a 32 … shaft; 40. 43 … convex portions; 40a, 43a ….

Claims

1. A door opening and closing mechanism, which can open and close a door from two sides, is characterized in that,

on both sides of the door, comprising:

a cam mechanism for engaging and disengaging the door with and from the body;

a handle to be held when the door is opened; and

a cam lever that rotates in conjunction with the handle; wherein

The cam mechanism comprises a rotating shaft pin and a groove cam, a locking outer cam arranged on the body and a sliding outer cam arranged on the door, wherein in the closed state of the door, the rotating shaft pin and the groove cam of the cam mechanism on two sides are in a first clamping position, when one handle is operated, a cam rod corresponding to the operated handle rotates backwards to press the locking outer cam so that the door moves to the opening side, and the rotating shaft pin and the groove cam of the cam mechanism on the opposite side of the opening side are in a second clamping position which can rotate freely;

the cam lever has a convex portion on a pressing surface for pressing the lock outer cam and a raised surface raised at a front end side,

the cam lever presses the open side of the front end portion of the lock outer cam by an inclined surface opposite to the open side of the convex portion at least at the time of a rotation start operation of the door opening operation,

the position at which the cam lever presses the lock outer cam is moved from the inclined surface of the convex portion to a raised surface on the tip end side in accordance with the rotation of the cam lever.

2. The door opening and closing mechanism according to claim 1,

the rotation shaft of the cam lever is located on the center side of the door with respect to the pressed lock outer cam.

3. A refrigerator, characterized by comprising:

the door opening and closing mechanism of claim 1 or 2.