JP3421204B2 - Door open / close support device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing support device for a door, and more particularly to an opening / closing support device for rotatably supporting a lower side of a door that opens and closes an opening of a storage case.

[0002]

2. Description of the Related Art As shown in Japanese Utility Model Laid-Open No. 63-66791 as one type of the opening and closing support device, a hinge pin protruding upward is provided at a tip end portion of a side edge lower end portion of an opening of a storage. Plate mounted on the hinge plate, a first cam member fixed on the hinge plate while being inserted into the hinge pin and located on the outer periphery of the hinge pin, and a side edge of a door that opens and closes the opening of the storage. There is an opening / closing support device that includes a second cam member that is fixed to the lower end portion and that is inserted into the hinge pin and that meshes with the first cam member.

In the opening / closing support device, the lower end of the side edge of the door is openably / closably supported by the lower end of the side edge of the opening of the storage, and the two cam members rotate relative to each other when the door is opened / closed. Then, when the door is opened, the door is raised and when the door is closed, the door is lowered, and in particular, the descending operation at the time of closing the door is used as an assisting force in the closing direction of the door. It is intended to be securely closed.

[0004]

The opening / closing support device has a function of raising and lowering the door when the door is opened and closed. However, in the opening / closing support device, both cam members have a cam shape that functions effectively just before closing the door to reliably close the door, and both cam members operate smoothly during opening / closing operation of the door. Fewer cam shapes, the lowering movement during door closing operation is stronger than the upward movement during opening operation, both cam members function more effectively immediately before door closing, and the door closing operation is lighter. No consideration is given to a cam shape or the like that allows both cam members to regulate the maximum opening amount of the door and does not require a special rotation regulating mechanism for regulating the maximum opening amount of the door.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to address these problems in an open / close support device of the type described above, and further to facilitate mounting of each cam member to a storage or door, or to a door. An object of the present invention is to provide an opening control mechanism having a simple structure capable of reliably controlling the maximum opening amount.

[0006]

The present invention relates to a door opening / closing support device, and more particularly, to a hinge plate having a hinge pin projecting upward at a tip end thereof and attached to a lower end portion of a side edge of an opening of a storage case. A first cam member fixed on the hinge plate in a state of being inserted into the hinge pin and located on the outer periphery of the hinge pin, and the hinge pin fixed to the lower edge of the side edge of the door that opens and closes the opening of the storage. A second cam member that meshes with the first cam member in a state where the door is inserted into the door, the side edge lower end portion of the door is openably and closably supported by the side edge lower end portion of the opening of the storage, and the door is opened. The object of the present invention is to apply an opening / closing support device of a type in which the cam is raised during the opening operation and is lowered during the closing operation by the relative rotation of the cam members to assist the closing operation of the door.

Therefore, the first opening / closing support device according to the present invention is the opening / closing support device of the above-mentioned type, wherein
The meshing surface of the cam member is formed in a stepped shape having an inclined cam surface extending upward , and the meshing surface of the second cam member.
Is formed in a stepped shape having an inclined cam surface which meshes with the inclined cam surface of the first cam member extending downwardly, both of these inclined cam surfaces, when in sliding contact intermediate state to mesh with each other It is characterized in that the door is set to be in a closed state.

[0008] The second opening and closing support device according to the present invention, the opening and closing support device of the type described above, engagement surfaces of the first cam member has a first inclined cam surface extending in the vertical direction,
A flat surface that extends horizontally from the tip of the first inclined cam surface, a convex portion that includes a second inclined cam surface that extends vertically from the distal end of the flat surface, and an unevenness that has two concave portions that are located sandwiching the convex portion. The engagement surface of the second cam member, which is formed in a shape, has a first inclined cam surface that extends in the vertical direction, a flat surface that extends horizontally from the tip of the first inclined cam surface, and a vertical surface that extends from the tip of the flat surface. Is formed in a concave-convex shape having a convex portion formed of a second inclined cam surface extending in the direction and two concave portions positioned on both sides of the convex portion so that the concave portions and the convex portions of both cam members mesh with each other. It is characterized by being configured.

In the opening / closing support device, when the door is closed, the second inclined cam surface of the convex portion of the first cam member and the first inclined cam surface of the convex portion of the second cam member mesh with each other and make sliding contact. when it is in the middle of the state, set so that the door is in a closed state
It is possible to adopt a predetermined configuration.

Further, in the opening / closing support device, the circumferential widths of the convex portion and the concave portion of the first cam member and the circumferential widths of the concave portion and the convex portion of the second cam member are formed to have substantially the same size. The inclination angle of the inclined cam surface on the side of engagement between the concave portion of the first cam member and the convex portion of the second cam member that is engaged immediately before the door is closed is set to another inclined cam surface. Is set to be larger than the inclination angle of the first cam member, and the inclined cam surface on the side that meshes in the opening direction of the door in the concave portion of the first cam member and the convex portion of the second cam member that mesh when opening the door is 90 degrees or A configuration in which the angle is set to a value close to this is provided, and an uneven portion including the convex portion and the concave portions sandwiching the convex portion is provided on the meshing surface of the cam members.
As a set, a configuration in which a plurality of sets of the same concavo-convex portion are evenly formed in the circumferential direction and a configuration in which the concavo-convex portion is formed radially around the hinge pin can be adopted.

Further, in the above-mentioned double opening / closing support device according to the present invention, the first cam member is provided with a flange for attachment to the hinge plate, and the second cam member is provided with a flange for attachment to the door. Arrangement to be provided, an arc-shaped portion of a predetermined length located on the outer periphery of the first cam member around the hinge pin at the tip edge of the hinge plate, and a protrusion projecting outward at each end of the arc-shaped portion And an engaging portion that is engageable with each of the protruding portions facing the outer periphery of the arc-shaped portion at the tip edge of the hinge plate is provided on the outer periphery of the second cam member .
The arcuate portion and both end portions and the engaging portion form an opening restriction mechanism that restricts the maximum opening amount of the door between the hinge plate and the second cam member, and the opening is provided on the outer periphery of the first cam member. It is possible to employ a configuration in which a tubular portion that houses the second cam member is provided.

[0012]

In the first opening and closing support device according to the present invention, when the door in the closed state is opened, the second opening and closing support device is opened.
The cam member rotates integrally with the door, meshes the inclined cam surface with the inclined cam surface of the first cam portion, and rides over the inclined cam surface while making sliding contact. As a result, the door is rotated in the opening direction and is raised by an amount corresponding to the height of both inclined cam surfaces. When the door in the open state is closed, the second cam member rotates integrally with the door in the opposite direction to the above, the inclined cam surface is meshed with the inclined cam surface of the first cam portion, and the sliding contact is made. Go down the same inclined cam surface.

As a result, the door is rotated in the closing direction and is lowered by an amount corresponding to the height of both inclined cam surfaces, and the operating force at the time of lowering acts as a turning force in the closing direction of the door, Assists the closing action of. As a result, the door is securely closed and the storage is closed.

By the way, in the opening / closing support device,
Since the door is closed when the two inclined cam surfaces mesh with each other and are in the midway of sliding contact, the door is still rotated in the closing direction even when the door is closed. Is acting, and this turning force acts so as to press the door against the opening edge portion of the storage, thereby further ensuring the closed state of the door.

Further, in the second opening / closing support device according to the present invention, when the door is closed, the convex portion of the second cam member is in mesh with one concave portion of the first cam member. When the door in the closed state is opened, the second cam member rotates integrally with the door, and the convex portion of the second cam member causes the first inclined cam surface to move to the second inclined cam surface of the convex portion of the first cam member. The second inclined cam is moved to the other concave portion of the first cam member while sliding over the second inclined cam surface while reaching the flat surface of the first cam member. The surface is meshed with the first inclined cam surface of the first cam member so as to be in sliding contact therewith, and meshes with the other concave portion of the first cam member.

As a result, the door is rotated in the opening direction and is raised by an amount corresponding to the height of both inclined cam surfaces, and is further rotated in the opening direction at the raised position, and then the height of both inclined cam surfaces is increased. It is lowered by an amount equivalent to that and is fully opened.

Further, in the opening / closing support device, when the door is opened to the maximum extent, the convex portion of the second cam member is in mesh with the other concave portion of the first cam member and is in the open state. When a certain door is closed, the second cam member rotates integrally with the door in the opposite direction, and the convex portion of the second cam member causes the second inclined cam surface to move to the first convex portion of the first cam member. While meshing with and slidingly contacting the slanted cam surface, overcoming the first slanted cam surface to reach the flat surface of the first cam member, and further slidingly contacting the flat surface to move to one concave portion of the first cam member, The first slanted cam surface meshes with the second slanted cam surface of the first cam member and is in sliding contact therewith, and meshes with one recess of the first cam member.

As a result, the door is rotated in the closing direction and is raised by an amount corresponding to the height of both inclined cam surfaces, and is further rotated in the closing direction at the raised position, and then the height of both inclined cam surfaces is increased. The amount of movement corresponding to this is lowered, and the operating force at the time of lowering acts as a turning force in the closing direction of the door to assist the closing operation of the door. As a result, the door is securely closed and the storage is closed.

As described above, in the opening / closing support device, since the convex portion of the second cam member is engaged with the concave portion of the other of the first cam member when the door is opened, the door is opened to the maximum extent. The opened door can be held as it is, and the work of putting in and out the stored items can be done with both hands without holding the opened state of the door by hand, which greatly improves the usability of the storage. .

In the opening / closing support device, the second
Until the cam member meshes with each concave portion of the first cam member, the flat surfaces of the convex portions of both cam members are in sliding contact. For this reason,
During this time, the lifting and lowering of the door is restricted to prevent excessive lifting and lowering of the door, and wear and damage of the meshing surface of each cam member can be reduced.

In the opening / closing support device, when the door is closed, the second inclined cam surface of the convex portion of the first cam member and the second inclined cam surface of the first cam member are closed.
If the door is closed when the first inclined cam surfaces of the convex portions of the cam member mesh with each other and are in the middle of sliding contact, the same structure as the first opening / closing support device according to the present invention can be achieved. It is possible to obtain the action and effect.

In the opening / closing support device, the first
If the circumferential widths of the convex portions and the concave portions of the cam member and the circumferential widths of the concave portions and the convex portions of the second cam member are formed to have substantially the same dimensions, the sliding of the convex portions of each cam member will occur. It is possible to form a large flat surface as a portion, reduce the pressure per unit area of the flat surface, smooth the operation of each cam member, and improve the durability.

Further, in the opening / closing support device, the inclination angle of the inclined cam surface on the side of engagement between the concave portion of the first cam member and the convex portion of the second cam member, which meshes immediately before the door is closed, when the door is closed, If the configuration is set to be larger than the inclination angle of the other inclined cam surface, the door closing operation can be performed lightly and the acting force in the door closing direction can be increased.

Further, in the opening / closing support device, the inclined cam surface of the concave portion of the first cam member and the convex portion of the second cam member, which mesh with each other when the door is opened, are inclined by 90 degrees or more. By adopting a configuration that is set to an angle close to, it is possible to regulate the opening of the door beyond a predetermined amount, and the maximum opening amount of the door is regulated to the predetermined amount without providing a special rotation regulation mechanism. can do.

Further, in the opening / closing support device, a plurality of sets of convex and concave portions are formed on the meshing surface of both cam members, with one concave and convex portion consisting of a convex portion and both concave portions located on both sides of the convex portion. It is possible to adopt a configuration that is formed evenly in the direction,
As a result, a plurality of inclined cam surfaces that engage at the same time form a set, and the sliding contact pressure of each inclined cam surface is dispersed in the circumferential direction, so that the operation of both cam members can be performed more smoothly and the engagement surfaces of both cam members can be Wear and damage can be further suppressed. These actions and effects can be effectively achieved by forming each uneven portion radially with the hinge pin as the center.

In the double open / close support device according to the present invention, the first cam member is provided with the flange for attaching to the hinge plate, and the second cam member is provided with the flange for attaching to the door. Therefore, it is possible to easily attach the first cam member to the storage side and the second cam member to the door side.

Further, in these opening / closing support devices,
The tip end edge of the hinge plate is provided with an arc-shaped portion of a predetermined length located on the outer periphery of the first cam member with the hinge pin as the center, and protrusions protruding outward at each end of the arc-shaped portion. 2 An engaging portion is provided on the outer periphery of the cam member so as to face the outer periphery of the arcuate portion at the tip edge of the hinge plate and engages with each protrusion so that the maximum opening amount of the door can be provided between the hinge plate and the second cam member. It is possible to employ a configuration that forms an opening regulation mechanism that regulates. Accordingly, the opening restriction mechanism that restricts the maximum opening amount of the door can be configured with a simple structure without increasing the number of parts.

Further, in these opening / closing support devices,
It is possible to adopt a configuration in which a cylindrical portion for accommodating the second cam member is provided on the outer periphery of the first cam member, whereby a lubricant such as grease intervening between the mating surfaces of both cam members is exposed to the outside. Leakage can be prevented.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the drawings. FIG. 1 shows an example of a double door type refrigerator in which an opening / closing support device according to the present invention is used to support an opening / closing door. The double door type refrigerator (hereinafter also simply referred to as a refrigerator) shows a front state in which both upper and lower doors are closed and all the doors are moved to the front side (front side). It can be opened by rotating, and can be closed by rotating to the back side (backward).

The refrigerator has upper and lower refrigerating chambers. As shown in FIGS. 1 and 2, the refrigerator main body 11 has front opening portions 11a and 11b at the upper and lower portions thereof, respectively. A pair of first and second doors 12, 13 that are opening and closing doors that open and close the upper front opening 11a, and a pair of first and second doors 14 that are opening and closing doors that open and close the lower front opening 11b. It is equipped with 15.

Each of the first doors 12 and 14 has a left edge, which is a base end thereof, at each of the openings 11a and 11b of the storage body 11.
Is rotatably supported in the front-rear direction on the left side edge of each of the second doors 13 and 15, and the second doors 13 and 15 are located on the right side edges of the bases of the second doors 13 and 15 on the right side of the openings 11a and 11b of the storage body 11. It is rotatably supported by the edge portion in the front-rear direction.

As shown in FIG. 2, the first door 12 is supported at its lower end by an opening / closing support device 20a according to an example of the present invention and at its upper end by a known hinge device 20b. There is. The other doors 13 to 15 are also the first door 12
Similarly, it is supported by the opening / closing support device 20a and the hinge device 20b. Therefore, in the following description, the term "opening and closing door 10a" is used as a generic term for all the doors 12 to 15.

The refrigerator is of the automatic closing type in which the axes of the opening / closing support device 20a for supporting the opening / closing door 10a and the hinge device 20b are deviated from each other.
2a is rotated about the rotation axis indicated by the chain double-dashed line in FIG. 2 at the time of opening / closing operation, and the opening / closing door 10a is in the state of being inclined by an angle corresponding to the inclination angle of the rotation axis in the opened state. The open / close door 10a in the state is configured to be gradually rotated in the closing direction to be closed by the action of a slight turning force caused by the inclination angle thereof.

When the opening / closing door 10a is closed, the sealing member arranged along the peripheral edge on the back side of the opening / closing door 10a comes into close contact with the opening edge of the cabinet body 11 and the tip of the opening / closing door 10a. The seal members arranged along the side edges on the surface side are in close contact with each other, and the opening of the cabinet body 11 is sealed.

The open / close support device 20a is shown in FIGS.
As shown in FIG. 5, the hinge plate 21 and the hinge pin 2
2, a first cam member 23 and a mounting flange 24a integral therewith, a second cam member 25 and a mounting flange 24b integral therewith.

As shown in FIG. 3, the hinge plate 21 is attached to the lower edge of each opening of the cabinet main body 11 and has a flat plate shape, and a hinge pin 22 is fixed to the leading end side in an upright shape. There is.

As shown in an enlarged view in FIG. 4, the first cam member 23 is a cylindrical member integrally formed at the tip end portion on the mounting flange 24a, and the engagement surface on the upper end side has a convex portion. 23
A and three recesses 23b are formed in the circumferential direction at a predetermined interval, and three recesses 23b are formed at a predetermined interval. The convex portion 23a and the concave portion 23b are connected to each other by the first inclined cam surface 23c and the second inclined cam surface 23d, and the top of the convex portion 23a and the concave portion 2a.
The bottom of 3b is formed into a flat surface, and the inclined cam surfaces 23c and 23d are formed into the same inclination angle. In addition, the convex portions 23a and the concave portions 23b are formed to have the same width in the circumferential direction and are formed radially around the inner hole 23e. The inner hole 23e is formed in such a size that the hinge pin 22 can be inserted therethrough without play.

The first cam member 23, which is inserted into the hinge pin 22, overlaps with the hinge plate 21 and is fixed on the hinge plate 21. The convex portion 23a, the concave portion 23b, and the inclined cam surfaces 23c and 23d. Is positioned so that the meshing surface on which is formed faces upward.

The second cam member 25 has a mounting flange 24b as shown in an enlarged view in FIG. 5 (however, approximately 0.7 times that in FIG. 4).
Is a cylindrical shape integrally formed at the tip portion on the lower surface side, and the engagement surface on the lower surface side has a convex portion 25a and a concave portion 25b.
Are formed at a predetermined interval in the circumferential direction and are formed in groups of three. The convex portion 25a and the concave portion 25b are the first inclined cam surface 25.
c and the second inclined cam surface 25d are connected to each other, the top of the convex portion 25a and the bottom of the concave portion 25b are formed into flat surfaces, and the inclined cam surfaces 25c, 25c
5d are formed with the same inclination angle. Also, the convex portion 2
5a and the concave portion 25b are formed to have the same width in the circumferential direction and are formed radially around the inner hole 25e. The inner hole 25e is formed in such a size that the hinge pin 22 can be inserted without rattling and the relative rotation can be smoothly performed.

In the second cam member 25, the convex portion 25
a, the recess 25b, and the inclined cam surfaces 25c and 25d are
The first cam member 23 is formed to have substantially the same dimensions as the convex portion 23a, the concave portion 23b, and the inclined cam surfaces 23c and 23d, and is fixed to the lower surface of the base end portion of the opening / closing door 10a by the mounting flange 24b, and the hinge pin 22 is provided. The meshing surface of the first cam member 23 meshes with the meshing surface of the first cam member 23 in the state of being inserted into the.

FIG. 6 shows both cam members 2 in a state in which the opening / closing support device 20a is used to support the opening / closing door 10a.
3 (a) and 3 (b) show a meshed state, in which (a) is a meshed state during opening / closing of the opening / closing door 10a and (b) is an opening / closing door 10.
FIG. 3C shows a meshing state of the door a when it is closed, and FIG.

In the opening / closing support device 20a, when the opening / closing door 10a is closed, the convex portion 25a of the second cam member 25 is formed.
Immediately before fully engaging with the recess 23b of the first cam member 23, the first inclined cam surface 25c of the second cam member 25 is in the state of being in mesh with the second inclined cam surface 23d of the first cam member 23. As shown, both cam members 23, 25 are formed.

In the refrigerator in which the opening / closing support device 20a having such a structure is used to support the opening / closing door 10a, the opening / closing door 1
0a is closed, the convex portion 25a of the second cam member 25 meshes with the concave portion 23b of the first cam member 23 as shown in FIG. The first cam member 23 is in mesh with the second inclined cam surface 23d.

When the opening / closing door 20a in this closed state is opened, the second cam member 25 rotates integrally with the opening / closing door 10a, and the convex portion 25a of the second cam member 25 moves the first inclined cam surface 25c to the first inclined cam surface 25c. While sliding on the second inclined cam surface 23d of the first cam member 23, overcoming the second inclined cam surface 23d and reaching the flat surface of the convex portion 23a of the first cam member 23 as shown in FIG. Further, the second inclined cam surface 25 is moved to the other concave portion 23b of the first cam member 23 while slidingly contacting the same flat surface.
While d is meshed with and slidably in contact with the first inclined cam surface 23c of the first cam member 23, it is meshed with the recess 23b of the first cam member 23 as shown in FIG.

During this time, the opening / closing door 10a is rotated in the opening direction and is raised by an amount corresponding to the height of the two inclined cam surfaces, and is further rotated in the opening direction at the raised position, and then the two inclined cam surfaces are moved. It is lowered by the amount corresponding to the height and opened to the maximum.

Further, in the opening / closing support device 20a, when the door is opened to the maximum extent, the convex portion 25a of the second cam member 25 becomes the concave portion 23b of the first cam member 23 as shown in FIG. When the open / close door 10a in the meshed state shown in the figure is closed, the second cam member 25 causes the open / close door 1 to move.
0a rotates in the opposite direction to the above, and the convex portion 25a of the second cam member 25 slides the second inclined cam surface 25d onto the first inclined cam surface 23c of the convex portion 23a of the first cam member 23. While overcoming the first inclined cam surface 23c, the first cam member 2
3 reaches the flat surface of the convex portion 23a, and further slides on the flat surface to move to one concave portion 23b of the first cam member 23,
The first slanted cam surface 25c meshes with the second slanted cam surface 23d of the first cam member to be in sliding contact therewith, and meshes with one concave portion 23b of the first cam member 23, resulting in the meshed state shown in FIG. .

During this time, the opening / closing door 10a is rotated in the closing direction and is raised by an amount corresponding to the height of the two inclined cam surfaces, and is further rotated in the closing direction at the raised position, and then the two inclined cam surfaces are moved. It descends by an amount corresponding to the height, and the operating force at the time of descending acts as a turning force in the closing direction of the door to assist the closing operation of the door. As a result, the open / close door 10a is reliably closed and the storage is hermetically sealed.

By the way, in the opening / closing support device 20a, as shown in FIG.
Since the opening / closing door 20a is closed when the two inclined cam surfaces 23d and 25c are meshed with each other and is in the middle of sliding contact, the opening / closing door 20a is closed even in the closed state. It should be noted that there is a turning force acting in the closing direction, and this turning force acts so as to press the opening / closing door 10a against the opening edge portion of the cabinet body 11, thereby ensuring the closing state of the opening / closing door 10a.

Further, in the opening / closing support device 20a, as shown in FIG. 6 (c), when the opening / closing door 10a is opened, the convex portion 25a of the second cam member 25 is formed in the other concave portion 23b of the first cam member 23. Since it is configured to engage with each other, the opened / closed door 10a that is opened to the maximum extent can be held as it is, and the work of taking in / out the stored items from / to the refrigerator can be performed without holding the opened / closed door 10a by hand. It can be done with both hands, which greatly improves the usability of the refrigerator.

In addition, in the opening / closing support device 20a, the convex portion 25a of the second cam member 25 is the first cam member 23.
Of the two cam members 2 until they are engaged with the respective concave portions 23b.
The flat surfaces of the projections 23a and 25a of the parts 3 and 25 are in sliding contact with each other. Therefore, during this period, the lifting / lowering of the opening / closing door 10a is restricted to prevent excessive lifting / lowering of the opening / closing door 10a.
It is possible to reduce wear and damage on the mating surfaces of the cam members 23 and 25.

Further, in the opening / closing support device 20a, the circumferential widths of the convex portions 23a and the concave portions 23b of the first cam member 23 and the circumferential widths of the convex portions 25a and the concave portions 25b of the second cam member 25 are set. Since the cam members 23 and 25 are formed to have substantially the same size, a large flat surface, which is a sliding portion of the convex portions 23a and 25a of the cam members 23 and 25, can be formed, and the pressure per unit area of the flat surface can be reduced. The operation of each cam member 23, 25 can be made smooth and the durability can be improved.

Further, in the opening / closing support device 20a, the convex portions 23a, 2 are formed on the meshing surfaces of the cam members 23, 25.
Since the concave and convex portions composed of both concave portions 23b and 25b located on both sides of 5a are set as one set, and three sets of the concave and convex portions are evenly formed in the circumferential direction, each inclined cam surface that meshes at the same time becomes three sets. As a result, the sliding contact pressure of each inclined cam surface is dispersed in the circumferential direction, the operation of both cam members 23, 25 can be performed more smoothly, and the wear and damage of the meshing surfaces of both cam members 23, 25 can be further suppressed. . These actions and effects can be effectively achieved by forming each uneven portion radially with the hinge pin 22 as the center.

In the opening / closing support device, the first
Since the cam member 23 is provided with the attachment flange 24a for the hinge plate 21 and the second cam member 25 is provided with the attachment flange 24b for the opening / closing door 10a, the attachment of the first cam member 23 to the cabinet main body 11 side, Also, it is possible to easily attach the second cam member 25 to the opening / closing door 10a side.

FIG. 7 shows a first modification of both cam members 23 and 25 in the opening / closing support device 20a.
In both cam members 26 and 27 according to the modified example, the first inclined cam surface 26c and the second inclined cam surface 27d of the respective convex portions 26a and 27a are formed at the same inclination angle, and the respective convex portions 26a are formed. , 27a of the second inclined cam surface 26d and the first inclined cam surface 27c are formed at the same inclination angle, and the second inclined cam surface 26d and the first inclined cam surface 27c of each of the protrusions 26a, 27a are inclined at the first inclination. The inclination angle is larger than that of the cam surface 26c and the second inclined cam surface 27d.

Therefore, such cam members 26, 27
According to the opening and closing support device having the above, the opening operation is slightly heavy during the opening operation of the opening and closing door 10a involving the second inclined cam surface 26d of the first cam member 26 and the first inclined cam surface 27c of the second cam member 27. However, when closing the opening / closing door 10a involving the first inclined cam surface 26c and the second inclined cam surface 27d, the closing operation becomes light and the turning force in the closing direction generated immediately before closing the opening / closing door 10a becomes large. The opening and closing door 10a is closed more reliably.

FIG. 8 shows a second modification of both cam members 23 and 25 in the opening / closing support device 20a.
Both cam members 28 and 29 according to the modified example include two types of convex portions 28a, 28b, 29a and 29b having different shapes. First convex portion 28a of both cam members 28, 29
And the second convex portion 29b, and the second convex portion 28b and the first convex portion 29a of the cam members 28, 29 are formed in the same shape.

In the first cam member 28, the second convex portion 2
The second inclined cam surface 28f in 8b is formed at an angle of approximately 90 degrees, and all the inclined cam surfaces 28c to 28e except the second inclined cam surface 28f are formed at an inclination angle smaller than 90 degrees. . In addition, the second cam member 29
In the first convex portion 29a, the first inclined cam surface 2
9c is formed at an angle of about 90 degrees, and all the inclined cam surfaces 29d to 29c except the first inclined cam surface 29c.
29f is formed with an inclination angle smaller than 90 degrees.

Therefore, such cam members 28, 29
According to the opening / closing support device including the opening / closing door 10a, the second concave portion 28g of the first cam member 28 and the first convex portion 29a of the second cam member 29, which mesh with each other when the opening / closing door 10a is opened, mesh with the opening direction side of the opening / closing door 10a. The inclined cam surfaces that form the second inclined cam surface 28f and the first inclined cam surface 29c that have an angle of approximately 90 degrees. Therefore, the open / close door 10a cannot be further rotated in the opening direction in this meshed state, and the maximum open amount of the open / close door 10a is restricted to a predetermined amount without providing a special rotation restricting mechanism. You can

FIG. 9 shows the first opening / closing support device 20a.
A variant is shown. Opening / closing support device 20 of the modified example
In c, the tip edge portion of the hinge plate 21 is locally formed in the recess 21a. The recess 21a is formed in an arc shape centering on the hinge pin 22, is located in the projecting edge portions 21b and 21c projecting to each end, and is fixed to the hinge plate 21 by the first cam. It is located on the outer periphery of the member 23.

On the other hand, the second cam member 25 is formed with a protruding piece 25f protruding downward at the tip edge thereof. The projecting piece 25f faces the outer periphery of the arcuate recess 21a of the hinge plate 21 when the second cam member 25 is meshed with the first cam member 23, and both projecting edge portions 21b,
It is possible to rotate between 21c.

Therefore, according to the opening / closing support device 20c, the second cam member 25 is opened by opening the opening / closing door 10a.
The protruding piece 25f provided at the end abuts on the protruding edge portion 21b on the front end side of the hinge plate 21, and further rotation toward the open side is restricted. Therefore, the arcuate recess 21a of the hinge plate 21 and the protruding edge portions 21b and 21c, and the protruding piece 2
5f constitutes a rotation restricting mechanism that restricts the maximum opening amount of the opening / closing door 10a. The rotation restricting mechanism includes the open / close support device 2
It is possible to construct a simple structure without increasing the number of components of 0c.

FIG. 10 shows a second modification of the opening / closing support device 20a. In the opening / closing support device 20d, the cylindrical tubular portion 24c is provided on the mounting flange 24a formed integrally with the first cam member 23, and the first cam member 23 is provided inside the tubular portion 24c. Has been formed. On the meshing surface of the first cam member 23, a lubricant such as grease is supplied while being inserted into the hinge pin 22 and attached to the hinge plate 21, and the second cam member 25 on this meshes with the lubricant. is doing.

Therefore, according to the opening / closing support device 20d, it is possible to prevent the lubricant existing between the meshing surfaces of the cam members 23 and 25 from leaking to the outside.

[Brief description of drawings]

FIG. 1 is a front view showing a double door type refrigerator in which an open / close support device according to the present invention is used to support an open / close door.

FIG. 2 is a vertical cross-sectional side view taken along the line 2-2 of FIG. 1 showing a support state of the door.

FIG. 3 is a side view of the opening / closing support device showing a supporting state of a lower end side of the opening / closing door.

FIG. 4 is a plan view (a) of a first cam member constituting the opening / closing support device and a side view (b) viewed from a direction of an arrow 4.

FIG. 5 is a bottom view (a) and a side view (b) of a second cam member constituting the opening / closing support device.

FIG. 6 is a partially exploded vertical cross-sectional view of the cam members in a meshed state, in which the opening / closing door is in the middle of opening / closing (a),
It is a longitudinal cross-sectional view when the open / close door is in a closed state (b) and when the open / close door is in an open state (c).

FIG. 7 is a partially developed vertical cross section in a meshed state showing a first modified example of both cam members.

FIG. 8 is a partially developed vertical cross-sectional view showing a second modified example of both cam members in a meshed state.

FIG. 9 shows a first modification of the opening / closing support device, and is a perspective view (a) of a hinge plate constituting the opening / closing support device.
It is a side view (b) of the opening and closing support device.

FIG. 10 is a vertical sectional side view showing a second modification of the opening / closing support device.

[Explanation of symbols]

10a ... Opening / closing door, 11 ... Cabinet body, 11a, 11b ... Front opening, 12, 14 ... First door, 13, 15 ... Second door, 2
0a, 20c, 20d ... Opening / closing support device, 20b ... Hinge device, 21 ... Hinge plate, 21a ... Recess, 21b,
21c ... protruding edge part, 22 ... hinge pin, 23, 26, 2
8 ... 1st cam member, 23a ... convex part, 23b ... concave part, 23
c, 26c, 28c, 28e ... First inclined cam surface, 23
d, 26d, 28d, 28f ... second inclined cam surface, 23e
... Inner hole, 24a, 24b ... Mounting flange, 24c ... Cylindrical part, 25, 27, 29 ... Second cam member, 25a ... Convex part,
25b ... Recesses, 25c, 27c, 29c, 29e ... First
Inclined cam surface, 25d, 27d, 29d, 29f ... Second inclined cam surface, 25e ... Inner hole, 25f ... Projecting piece.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-190608 (JP, A) Actual opening Sho 63-66791 (JP, U) Actual opening Sho 61-140066 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) E05F 1/06 F25D 23/02 306

Claims (11)

(57) [Claims] 1. A hinge plate having a hinge pin projecting upward at a tip end and attached to a lower end of a side edge of an opening of a storage, and a hinge plate fixed on the hinge plate while being inserted into the hinge pin. A first cam member located on the outer periphery of the hinge pin and a second cam member that is fixed to the lower end portion of the side edge of the door that opens and closes the opening of the storage and is inserted into the hinge pin to mesh with the first cam member. With a cam member,
A side edge lower end portion of the door is openably and closably supported by a side edge lower end portion of the opening of the storage, and the door is raised by the relative rotation of the cam members during the opening operation and lowered during the closing operation. The opening and closing support device is of a type that assists the closing operation of the door, and the engagement surface of the first cam member is formed in a stepped shape having an inclined cam surface extending upward.
One meshing surface of the second cam member is the first extending downwardly
The cam member is formed in a stepped shape having an inclined cam surface that meshes with the inclined cam surface, and the inclined cam surfaces are in mesh with each other so that the door is closed when the sliding cam is in the middle of sliding contact. A door opening / closing support device characterized by being set to . 2. A hinge pin protruding upward is provided at a tip end portion.
A hinge plate attached to the lower edge of the side edge of the opening of the storage
And the hinge pin on the hinge plate
It is fixed in the fixed state and is located on the outer periphery of the hinge pin
First cam member and door side for opening and closing the opening of the storage
Fixed to the lower edge of the rim and inserted through the hinge pin
And a second cam member that meshes with the first cam member,
The lower edge of the side edge of the door is the lower edge of the side edge of the opening of the storage.
Supported so that it can be opened and closed,
Due to rotation, it is raised during opening operation and closed operation
This is an opening and closing support device of a type that assists the closing operation of the door at the time of operation , and the meshing surface of the first cam member is a first inclined cam surface extending in the up-down direction and a tip end of the first inclined cam surface. It is formed in a concavo-convex shape having a convex portion composed of a flat surface extending horizontally, a second inclined cam surface extending vertically from the tip of the flat surface, and two concave portions sandwiching the convex portion.
In addition, the meshing surface of the second cam member extends in the up-down direction, a first inclined cam surface, a flat surface extending horizontally from the tip of the first inclined cam surface, and an up-down direction from the tip of the flat surface. It is formed in a concavo-convex shape having a convex portion formed of the second inclined cam surface and two concave portions positioned on both sides of the convex portion,
An opening / closing support device for a door, characterized in that the concave portions and the convex portions of both cam members are configured to mesh with each other. 3. The opening / closing support device according to claim 2,
During the closing operation of the door, when the second inclined cam surface of the convex portion of the first cam member and the first inclined cam surface of the convex portion of the second cam member mesh with each other and are in the middle of sliding contact. An opening / closing support device for a door, wherein the door is set to be in a closed state. 4. The opening / closing support device according to claim 2,
Opening / closing support of a door, characterized in that the circumferential widths of the projections and recesses of the first cam member and the circumferential widths of the recesses and projections of the second cam member are set to substantially the same size. apparatus. 5. The opening / closing support device according to claim 2,
The inclination angle of the inclined cam surface on the side of engagement between the concave portion of the first cam member and the convex portion of the second cam member that is engaged immediately before the door is closed is the inclination angle of another inclined cam surface. Door opening and closing support device characterized by being set larger. 6. The door opening / closing support device according to claim 2, wherein the recesses of the first cam member and the projections of the second cam member that engage with each other when the door is opened are engaged with each other in the opening direction of the door. An opening / closing support device for a door, wherein the side inclined cam surface is set to 90 degrees or an angle close thereto. 7. The door opening / closing support device according to claim 2, 3, 4, 5 or 6, wherein the convex portions and the convex portions are located on the meshing surfaces of the cam members. An opening / closing support device for a door, characterized in that a set of concave and convex portions is defined as one set, and a plurality of sets of the concave and convex portions are evenly formed in the circumferential direction. 8. The door opening / closing support device according to claim 2, 3, 4, 5, 6 or 7, wherein the uneven portion is formed radially around the hinge pin. Opening and closing support device. In closing the support device of the door according to claim 9 according to claim 7 or 8, wherein the first cam member for attachment to the hinge plate flange
It is provided, and opening and closing the support device of the door to the second cam member, characterized in that the flange of the mounting is provided for the door. 10. A closing support apparatus of the door according to claim 7 or 8, the leading edge of the hinge plate, said about said hinge pin
An arc-shaped portion of a predetermined length located on the outer periphery of the first cam member ,
Protrusions that protrude outward are provided at each end of the arcuate portion .
It is, and wherein the outer circumference of the second cam member, and the engageable engagement portion is not et provided in the each protrusion faces the outer circumference of the arcuate portion of the distal edge of the hinge plate, these
Arcuate portion and two end portions and the engaging portion, the opening and closing support device of the door, characterized by forming the opening restricting mechanism for restricting the maximum opening amount of the door between the second cam member and the hinge plate . 11. A door opening / closing support device according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein a cylinder for accommodating the second cam member is provided on an outer periphery of the first cam member. formed part is
Closing support device of the door, characterized by being.