JP7457972B2 - door hinge structure - Google Patents

Description

The present invention relates to a door hinge structure.

Conventionally, refrigerators are known that include a storage and a pair of double doors.
In such refrigerators, a hinge structure is used that supports the door so as to generate a turning force in the closing direction due to its own weight when the door is closed.
Conventionally, as such a hinge structure, for example, an inclined cam surface of a first cam member fixed to the refrigerator main body side and an inclined cam surface of a second cam member fixed to the door side mesh with each other and are in the middle of sliding contact. A technique has been disclosed in which a door is configured to be in a closed state at a certain time, so that even when the door is closed, a rotational force in the closing direction still remains (see, for example, Patent Document 1).

Japanese Patent Application Publication No. 10-121832

However, in the above-mentioned conventional technology, the door is opened and closed by sliding the upper and lower cam members separated, but since the sliding surfaces of the upper and lower cam members are flat, the door cannot be opened or closed. When rotational movement is applied to the cam members due to opening and closing, there is a risk that the upper and lower cam members will locally come into contact with each other, which will prevent smooth sliding of each cam member. In addition, local contact between the upper and lower cam members causes uneven wear of the cam members, making it impossible to smoothly open and close the door, and shortening the service life.
The present invention has been made in view of the above-mentioned points, and it is possible to prevent each cam member from locally contacting each other when the cam member rotates, and to smoothly open and close the door. It is an object of the present invention to provide a hinge structure for a door that can be used for a long time and have a long service life.

In order to achieve the above object, the present invention provides a door hinge structure for supporting a door provided at an opening of a storage so that it can be opened and closed, including a fixed side hinge member fixed to the storage side, and a fixed side hinge member fixed to the door side. the fixed side hinge member includes a fixed side cam member, and the fixed side cam member includes a plurality of fixed side cam protrusions provided in the circumferential direction, and a movable side hinge member provided with a plurality of fixed side cam protrusions in the circumferential direction. The movable hinge member includes a fixed cam recess located therebetween, and a fixed cam connection surface that connects the fixed cam protrusion and the fixed cam recess, and the movable hinge member includes a movable cam member; The movable cam member includes a plurality of movable cam protrusions provided in the circumferential direction and engaged with the fixed cam recess, and a movable cam recess located between the movable cam protrusions and receiving the fixed cam protrusion. and a movable-side cam connection surface that connects the movable-side cam protrusion and the movable-side cam recess, and a movable-side cam connection surface that connects the movable-side cam projection and the fixed-side cam connection surface, and between the fixed-side cam recess and the A fixed side boundary between the fixed side cam connection surface, a movable side boundary between the movable side cam protrusion and the movable side cam connection surface, and between the movable side cam recess and the movable side cam connection surface, When the movable cam member rotates, the movable cam connection surface is formed in an arc shape so that the movable cam connection surface slides in surface contact with the entire fixed cam connection surface. The hinge structure of the door.
According to this, by forming the fixed-side boundary and the movable-side boundary into arc shapes, the fixed-side cam connection surface and the movable-side cam connection surface come into surface contact with each other when the movable-side cam member rotates. It is possible to prevent the movable cam member from sliding and locally abutting against the fixed cam member.

According to the present invention, by forming the fixed-side boundary and the movable-side boundary into arc shapes, the fixed-side cam connection surface and the movable-side cam connection surface come into surface contact with each other when the movable-side cam member rotates. This can prevent the movable cam member from locally abutting against the fixed cam member due to sliding movement. As a result, the door can be opened and closed smoothly, and the wear resistance of the fixed-side cam member and the movable-side cam member can be improved to extend their lifespan.

FIG. 1 is a front view showing an embodiment of a refrigerator to which a door hinge structure according to the present invention is applied. The right view of the refrigerator of this embodiment. The left side view of the refrigerator of this embodiment. FIG. 2 is a perspective view showing the hinge structure of this embodiment. FIG. 3 is a perspective view showing a fixed side hinge member of the hinge structure of the present embodiment. FIG. 3 is a perspective view showing a movable hinge member of the present embodiment. FIG. 2 is a side view showing the hinge structure of this embodiment. FIG. 8 is a cross-sectional view taken along line AA in FIG. 7;

A first invention relates to a hinge structure for a door that supports a door provided at an opening of a storage compartment so as to be able to open and close freely, the hinge structure comprising a fixed-side hinge member fixed to the storage compartment side and a movable-side hinge member fixed to the door side, the fixed-side hinge member comprising a fixed-side cam member, the fixed-side cam member comprising a plurality of fixed-side cam projections provided in a circumferential direction, fixed-side cam recesses located between the fixed-side cam projections, and a fixed-side cam connection surface that connects the fixed-side cam projections and the fixed-side cam recesses, the movable-side hinge member comprising a movable-side cam member, the movable-side cam member comprising a plurality of fixed-side cam projections provided in a circumferential direction, fixed-side cam recesses located between the fixed-side cam projections, and a fixed-side cam connection surface that connects the fixed-side cam projections and the fixed-side cam recesses, the movable side cam protrusions are provided in a plurality of directions and engage with the fixed side cam recesses, the movable side cam recesses are located between the movable side cam protrusions and receive the fixed side cam protrusions, and a movable side cam connection surface connects the movable side cam protrusions and the movable side cam recesses, and the fixed side boundaries between the fixed side cam protrusions and the fixed side cam connection surface and between the fixed side cam recesses and the fixed side cam connection surface, as well as the movable side boundaries between the movable side cam protrusions and the movable side cam connection surface and between the movable side cam recesses and the movable side cam connection surface, are each formed in an arc shape.
According to this, by forming the fixed boundary and the movable boundary in an arc shape, when the movable cam member rotates, the fixed cam connecting surface and the movable cam connecting surface slide against each other in surface contact, preventing the movable cam member from locally contacting the fixed cam member. As a result, the door can be opened and closed smoothly, and the wear resistance of the fixed cam member and the movable cam member can be improved to extend their lifespan.

In a second aspect of the present invention, the fixed cam connection surface and the movable cam connection surface each include an inclined surface.
According to this, when opening the door, the movable cam connection surface slides along the fixed cam connection surface of the fixed cam member, and the movable cam member is gradually moved upward in accordance with the opening operation of the door. It can be moved. Additionally, when closing the door, the movable cam connection surface moves downward along the fixed cam connection surface, which applies force in the direction of automatically closing the door, allowing the door to be completely closed. .

In a third aspect of the present invention, the fixed-side boundary that faces each other across the fixed-side cam recess and the movable-side boundary that faces each other across the movable-side cam recess are curved in opposite directions to each other.
According to this, when the movable cam member rotates, the movable cam connection surface and the fixed cam connection surface slide against each other in face-to-face contact, preventing the movable cam member from locally abutting against the fixed cam member, thereby improving wear resistance.

In a fourth invention, when the door is closed, the movable cam protrusion enters the fixed cam recess, and the fixed cam protrusion enters the movable cam recess.
According to this, when the door is closed, the movable cam protrusion of the movable cam member enters the fixed cam recess of the fixed cam member, and the fixed cam protrusion enters the movable cam recess. The door can be held closed.

In the fifth aspect of the present invention, when the door is closed, the fixed cam connection surface and the movable cam connection surface that face each other are held in contact with each other.
According to this, when the door is closed, the opposing fixed cam connection surface and movable cam connection surface are held in contact with each other, thereby enabling the door to be held in the closed state.

In a sixth invention, the fixed side boundary is formed into an arc of the same curvature passing through the center of the fixed side cam member, and the movable side boundary is formed into an arc of the same curvature passing through the center of the movable side cam member. is formed.
According to this, when the movable cam member rotates, the movable cam connection surface and the fixed cam connection surface slide in surface contact with each other, and the movable cam member is locally moved relative to the fixed cam member. The wear resistance can be improved without causing any contact.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a front view showing an embodiment of a refrigerator to which a door hinge structure according to the present invention is applied. FIG. 2 is a right side view of the refrigerator of this embodiment. FIG. 3 is a left side view of the refrigerator of this embodiment.
As shown in FIG. 1, the refrigerator 1 is a commercial refrigerator, and includes a storage 2 and a plurality of doors 3.
The storage 2 is a box-shaped member with a heat insulating wall, and the storage 2 has a storage chamber inside and is open at the front.

The multiple doors 3 are rectangular door members that close the opening of the storage cabinet 2. The refrigerator 1 of this embodiment has a pair of doors 3 on the top and bottom, and these doors 3 are arranged with one side surface adjacent to each other.
Further, a bearing 4 for supporting the door 3 so that the door 3 can be opened and closed is provided on the upper outer side of each door 3, and a hinge 5 of this embodiment is provided on the lower outer side of each door 3.
These bearings 4 and hinges 5 allow the pair of doors 3 to be opened and closed in the left-right direction of the refrigerator 1. In other words, the pair of doors 3 are double doors 3.
Further, on the front surface of each door 3, a handle 6 is provided on each of the adjacent side surfaces.

Next, the hinge structure will be explained.
FIG. 4 is a perspective view showing the hinge structure of this embodiment. FIG. 5 is a perspective view showing the fixed side hinge member of the hinge structure of this embodiment. FIG. 6 is a perspective view showing the movable hinge member of this embodiment. FIG. 7 is a side view showing the hinge structure of this embodiment. FIG. 8 is a cross-sectional view taken along line AA in FIG.
In this embodiment, as shown in FIGS. 2 and 3, in the door 3 of the refrigerator 1, the axis of rotation of the hinge 5 and the axis of rotation of the bearing 4 are not perpendicularly positioned, and the axis of rotation of the hinge 5 is is arranged at an angle so that it is located slightly in front of the storage 2.

By arranging the rotational axes of the hinge 5 and the bearing 4 at an angle in this way, the door 3 is in a state of being inclined by an angle corresponding to the inclination angle of the rotational axis in the open state. The door 3 is of a so-called auto-closing type, in which the door 3 can be closed by rotating in the closing direction by the action of a slight rotational force due to its inclination angle.
Note that in FIGS. 2 and 3, the inclination of the rotation axis is exaggerated to make it easier to understand.

As shown in FIG. 4, the hinge 5 includes a fixed hinge member 10 attached to the storage 2 side of the refrigerator 1 and a movable hinge member 20 attached to the door 3 side.
As shown in FIG. 5, the stationary hinge member 10 includes a mounting flange 11 having a substantially oval shape. An annular stationary cam member 12 is integrally provided at one end of the mounting flange 11 . An attachment hole 13 is formed at the other end of the attachment flange 11 for attaching the stationary hinge member 10 to a storage. The mounting flange 11 is attached to the lower surface of both ends of the storage opening by screws (not shown) or the like that are tightened through the attachment holes 13.
The fixed side cam member 12 is provided with three fixed side cam protrusions 14 that are formed in a convex shape at predetermined intervals in the circumferential direction. A fixed-side cam recess 15 is formed between each fixed-side cam projection 14, and each fixed-side cam projection 14 and fixed-side cam recess 15 have a first inclined cam surface 16a and a second inclined cam surface 16b, respectively. It forms a continuous surface.
The first inclined cam surface 16a and the second inclined cam surface 16b function as fixed-side cam connection surfaces that connect the fixed-side cam protrusion 14 and the fixed-side cam recess 15.

As shown in FIG. 5, in this embodiment, a boundary line 17a between the fixed side cam protrusion 14 and the first inclined cam surface 16a and a boundary line 17b between the fixed side cam recess 15 and the first inclined cam surface 16a are , each formed in an arc shape.
The arcs of these boundary lines 17a and 17b are formed into arcs of the same curvature passing through the center of the stationary cam member 12. As a result, the first inclined cam surface 16a is formed into a curved surface formed by an arc passing through the center of the stationary cam member 12.
In this case, the curved surface is formed such that the top of the curved surface is located approximately in the width direction of the fixed-side cam protrusion 14 and the fixed-side cam recess 15, that is, in the radial direction of the fixed-side cam member 12.

Similarly, the boundary line 18a between the fixed side cam protrusion 14 and the second inclined cam surface 16b and the boundary line 18b between the fixed side cam recess 15 and the second inclined cam surface 16b are the boundaries of the first inclined cam surface 16a. It is formed in an arc shape that is curved on the opposite side to the arc shape in the lines 17a and 17b.
The arcs of each of these boundary lines 18a, 18b are formed into arcs of the same curvature passing through the center of the stationary cam member 12. Thereby, the second inclined cam surface 16b is formed into a curved surface formed by an arc passing through the center of the fixed side cam member 12.
In this case, the curved surface is formed such that the top of the arc is located approximately at the center of the stationary cam member 12 in the radial direction.
By configuring the curved surfaces in this manner, the first inclined cam surface 16a and the second inclined cam surface 16b are formed so that the curved surfaces thereof face each other.
That is, fixation between the fixed side cam protrusion 14 and the first inclined cam surface 16a and the second inclined cam surface 16b, and between the fixed side cam recess 15 and the first inclined cam surface 16a and the second inclined cam surface 16b. The side border is formed in an arc shape.

As shown in FIG. 6, the movable hinge member 20 includes a substantially circular mounting flange 21. As shown in FIG. A circular movable cam member 22 is integrally provided at one end of the mounting flange 21 . A cylindrical shaft support member 23 is integrally provided on the upper surface side of the movable cam member 22 . A cylindrical member 29 is integrally provided on one side of the shaft support member 23.
The movable hinge member 20 is fixed by inserting a shaft support member 23 and a cylindrical member 29 into one side of the lower end surface of the door 3.

The movable hinge member 20 has three movable cam protrusions 24 formed in a convex shape at predetermined intervals in the circumferential direction. A movable cam recess 25 is formed between each movable cam projection 24, and each movable cam projection 24 and movable cam recess 25 have a third inclined cam surface 26a and a fourth inclined cam surface 26b, respectively. It forms a continuous surface.
The third inclined cam surface 26a and the fourth inclined cam surface 26b function as a movable cam connection surface that connects the movable cam protrusion 24 and the movable cam recess 25.

As shown in FIG. 6, in this embodiment, the boundary line 27a between the movable side cam protrusion 24 and the third inclined cam surface 26a and the boundary line 27b between the movable side cam recess 25 and the third inclined cam surface 26a are , is formed in an arc shape.
The arcs of each of these boundary lines 27a and 27b are formed into arcs of the same curvature passing through the center of the movable cam member 22. As a result, the third inclined cam surface 26a is formed into a curved surface formed by an arc passing through the center of the stationary cam member 12.
In this case, the curved surface is formed such that the top of the arc is located approximately at the center of the movable cam member 22 in the radial direction.

Similarly, the boundary line 28a between the movable side cam protrusion 24 and the fourth inclined cam surface 26b and the boundary line 28b between the movable side cam recess 25 and the fourth inclined cam surface 26b are the boundaries of the third inclined cam surface 26a. It is formed in an arc shape that is curved on the opposite side to the arc shape in the lines 27a and 27b.
The arcs of each of these boundary lines 28 and 28b are formed into arcs of the same curvature passing through the center of the movable cam member 22. As a result, the fourth inclined cam surface 26b is formed into a curved surface formed by an arc passing through the center of the stationary cam member 12.
In this case, the curved surface is formed such that the top of the arc is located approximately at the center of the movable cam member 22 in the radial direction.
By configuring the curved surfaces in this way, the third inclined cam surface 26a and the fourth inclined cam surface 26b are formed so that their curved surfaces face each other.
That is, the movement between the movable side cam protrusion 24 and the third inclined cam surface 26a and the fourth inclined cam surface 26b, and between the movable side cam recess 25 and the third inclined cam surface 26a and the fourth inclined cam surface 26b. The side border is formed in an arc shape.

By forming the movable side cam member 22 of the movable side hinge member 20 in this manner, when the door 3 is closed, the movable side cam member 22 of the movable side hinge member 20 is configured to engage with the fixed side cam member 12 of the fixed side hinge member 10.
That is, when the door 3 is in the closed state, the movable cam protrusion 24 of the movable hinge member 20 fits into the fixed cam recess 15 of the fixed hinge member 10, and the fixed cam protrusion 14 of the fixed hinge member 10 fits into the movable cam recess 25 of the movable hinge member 20. In this state, the first inclined cam surface 16a of the fixed hinge member 10 and the third inclined cam surface 26a of the movable hinge member 20 abut against each other, and the second inclined cam surface 16b of the fixed hinge member 10 and the fourth inclined cam surface 26b of the movable hinge member 20 are held in abutment against each other.

Next, the operation of this embodiment will be explained.
As described above, when the door 3 is closed, the movable cam member 22 of the movable hinge member 20 engages with the fixed cam member 12 of the fixed hinge member 10, and the first The inclined cam surface 16a and the third inclined cam surface 26a of the movable hinge member 20 are in contact with each other, and the second inclined cam surface 16b of the fixed hinge member 10 and the fourth inclined cam surface 26b of the movable hinge member 20 are in contact with each other. are held in contact.

When the door 3 is rotated in the opening direction, the movable hinge member 20 is rotated together with the rotation of the door 3. As the movable hinge member 20 rotates, the fourth inclined cam surface 26b of the movable cam member 22 slides along the second inclined cam surface 16b of the fixed cam member 12. Thereby, as shown in FIG. 7, the movable cam member 22 is gradually moved upward in response to the opening operation of the door 3.
In this case, in this embodiment, since the second inclined cam surface 16b and the fourth inclined cam surface 26b are formed into curved shapes, when the movable cam member 22 rotates, the movable cam member The fourth inclined cam surface 26b of No. 22 is slid while being in surface contact with the entire second inclined cam surface 16b of the fixed side cam member 12. This prevents the movable cam member 22 from locally abutting against the fixed cam member.

Further, in the present embodiment, the curved surfaces of the second inclined cam surface 16b and the fourth inclined cam surface 26b are formed such that the tops of the curved surfaces are located approximately at the center of the fixed side cam member 12 in the radial direction. Therefore, when the fourth inclined cam surface 26b of the movable cam member 22 slides in surface contact with the entire second inclined cam surface 16b of the stationary cam member 12, the fourth inclined cam surface 26b It is possible to perform a centering function to gather at the center of the second inclined cam surface 16b.
Thereby, the fourth inclined cam surface 26b can be prevented from moving in the radial direction of the fixed side cam member 12 with respect to the second inclined cam surface 16b, and the movable side cam member 22 can be rotated stably. can be done.

When the door 3 is further rotated, the movable cam projection 24 of the movable cam member 22 rides up onto the fixed cam projection 14 of the fixed cam member 12, whereby the door 3 is held in the open state.
When closing the door 3, the door 3 is rotated in the closing direction, whereby the movable cam projection 24 of the movable cam member 22 drops from the fixed cam projection 14 of the fixed cam member 12. As a result, the fourth inclined cam surface 26b of the movable cam member 22 moves downward along the second inclined cam surface 16b of the fixed cam member 12, and a force acts in the direction in which the door 3 automatically closes, and the movable cam projection 24 of the movable cam member 22 engages with the fixed cam recess 15 of the fixed cam member 12, whereby the door 3 is completely closed.

The opening and closing operation of the door 3 has been described above with reference to the case where the movable cam member 22 rotates counterclockwise relative to the fixed cam member 12 during the opening operation of the door 3 located on the right side in FIG.
In Figure 1, when the door 3 located on the left side is opened, the movable cam member 22 is rotated clockwise relative to the fixed cam member 12, and at that time, the first inclined cam surface 16a and the third inclined cam surface 26a slide against each other.

As described above, in this embodiment, the fixed cam member 12 of the fixed hinge member 10 is located between the fixed cam protrusions 14 provided in plurality in the circumferential direction. The movable cam member 22 of the movable hinge member 20 includes a fixed cam recess 15 and a plurality of movable cam projections 24 provided in the circumferential direction and engaged with the fixed cam recess 15; A first inclined cam surface 16a and a second inclined cam surface 16b (slanted The third inclined cam surface 26a and fourth inclined cam surface 26b (inclined cam surface) that connect the movable cam protrusion 24 and the movable cam recess 25 are formed into curved shapes.

As a result, when the movable cam member 22 rotates relative to the fixed cam member 12, the inclined cam surfaces 26a, 26b of the movable cam member 22 slide while making surface contact with the entire inclined cam surfaces 16a, 16b of the fixed cam member 12, preventing the movable cam member 22 from locally contacting the fixed cam member. As a result, the door 3 can be opened and closed smoothly, and the wear resistance of the fixed cam member 12 and the movable cam member 22 can be improved.

Furthermore, in this embodiment, each of the inclined cam surfaces 16a, 16b, 26a, and 26b is formed of a curved surface that passes through the center of rotation of the movable cam member 22 with respect to the fixed cam member 12.
As a result, when the movable cam member 22 rotates, the inclined cam surfaces 16a, 16b, 26a, and 26b slide in surface contact with each other, and the movable cam member 22 is moved relative to the fixed cam member 12. There is no local contact, and wear resistance can be improved.

Further, in this embodiment, the curved surfaces of the inclined cam surfaces 16a, 16b, 26a, and 26b are formed such that the tops of the curved surfaces are located approximately at the center of the fixed cam member 12 in the radial direction.
As a result, when the inclined cam surfaces 16a, 16b, 26a, 26b are slid in surface contact with each other, the inclined cam surfaces 16a, 16b, 26b of the fixed cam member 12, 26a, 26b can be centered so that the inclined cam surfaces 26a, 26b of the movable side cam member 22 are aligned with the inclined cam surfaces 16a, 16b of the fixed side cam member 12. It is possible to prevent the movable cam member 22 from moving in the radial direction, and the movable cam member 22 can be rotated stably.

Note that the embodiment described above is an example of one aspect of the present invention, and can be arbitrarily modified and applied without departing from the spirit of the present invention.

(Additional note)
The following techniques are disclosed by the description of the above embodiments.

(Technology 1) A hinge structure for a door that supports a door provided at an opening of a storage cabinet so as to be able to open and close freely, the hinge structure includes a fixed-side hinge member fixed to the storage cabinet side, and a movable-side hinge member fixed to the door side, the fixed-side hinge member includes a fixed-side cam member, the fixed-side cam member includes a plurality of fixed-side cam projections provided in a circumferential direction, fixed-side cam recesses located between the fixed-side cam projections, and a fixed-side cam connection surface that connects the fixed-side cam projections and the fixed-side cam recesses, the movable-side hinge member includes a movable-side cam member, the movable-side cam member includes a plurality of fixed-side cam projections provided in a circumferential direction, a movable side cam protrusion that engages with the fixed side cam recess, a movable side cam recess that is located between the movable side cam protrusions and receives the fixed side cam protrusion, and a movable side cam connection surface that connects the movable side cam protrusion and the movable side cam recess, wherein the fixed side boundaries between the fixed side cam protrusion and the fixed side cam connection surface and between the fixed side cam recess and the fixed side cam connection surface, as well as the movable side boundaries between the movable side cam protrusion and the movable side cam connection surface and between the movable side cam recess and the movable side cam connection surface, are each formed in an arc shape.
With this configuration, by forming the fixed boundary and the movable boundary in an arc shape, when the movable cam member rotates, the fixed cam connection surface and the movable cam connection surface slide against each other in surface contact, preventing the movable cam member from locally contacting the fixed cam member. As a result, the door can be opened and closed smoothly, and the wear resistance of the fixed cam member and the movable cam member can be improved to extend their lifespan.

(Technique 2) The hinge structure according to Technique 1, wherein the fixed side cam connection surface and the movable side cam connection surface each have an inclination.
With this configuration, when opening the door, the movable cam connection surface slides along the fixed cam connection surface of the fixed cam member, and the movable cam member gradually moves upward in response to the door opening operation. can be done. Additionally, when closing the door, the movable cam connection surface moves downward along the fixed cam connection surface, which applies force in the direction of automatically closing the door, allowing the door to be completely closed. .

(Technique 3) The fixed-side boundary facing each other across the fixed-side cam recess and the movable-side boundary facing across the movable-side cam recess are each curved to opposite sides. The hinge structure according to technology 1 or technology 2.
With this configuration, when the movable cam member rotates, the movable cam connection surface and the fixed cam connection surface slide in surface contact with each other, so that the movable cam member is localized relative to the fixed cam member. The wear resistance can be improved without contacting the surface.

(Technique 4) Technology 1 characterized in that when the door is closed, the movable side cam protrusion enters the fixed side cam recess, and the fixed side cam protrusion enters the movable side cam recess. The hinge structure according to any one of Technique 3.
With this configuration, when the door is closed, the movable cam protrusion of the movable cam member enters the fixed cam recess of the fixed cam member, and the fixed cam protrusion enters the movable cam recess. can be held closed.

(Technique 5) The hinge structure according to technique 4, wherein when the door is closed, the opposing fixed side cam connection surface and the movable side cam connection surface are held in abutting state. .
With this configuration, when the door is closed, the opposing fixed side cam connection surface and movable side cam connection surface are held in contact with each other, so that the door can be held in the closed state.

(Technology 6) A hinge structure described in any one of Technology 1 to Technology 5, characterized in that the fixed side boundary is formed on an arc of the same curvature passing through the center of the fixed side cam member, and the movable side boundary is formed on an arc of the same curvature passing through the center of the movable side cam member.
With this configuration, when the movable cam member rotates, the movable cam connection surface and the fixed cam connection surface slide against each other in face-to-face contact, preventing the movable cam member from locally abutting against the fixed cam member, thereby improving wear resistance.

As described above, in the door hinge structure according to the present invention, when the movable cam member rotates, the movable cam member and the fixed cam member slide while making surface contact with each other, thereby performing the opening/closing operation of the door. It can be suitably used as a hinge structure that can be smoothly operated and improve the wear resistance of the fixed cam member and the movable cam member.

REFRIGERATION LIST 1 Refrigerator 2 Storage compartment 3 Door 4 Bearing 5 Hinge 10 Fixed-side hinge member 11 Mounting flange 12 Fixed-side cam member 14 Fixed-side cam protrusion 15 Fixed-side cam recess 16a First inclined cam surface 16b Second inclined cam surface 20 Movable-side hinge member 21 Mounting flange 22 Movable-side cam member 24 Movable-side cam protrusion 25 Movable-side cam recess 26a Third inclined cam surface 26b Fourth inclined cam surface

Claims (3)

A hinge structure for a door that supports a door provided at an opening of a storage facility so that the door can be opened and closed freely,
A fixed hinge member is fixed to the storage cabinet side, and a movable hinge member is fixed to the door side,
the fixed-side hinge member includes a fixed-side cam member, the fixed-side cam member including a plurality of fixed-side cam protrusions provided in a circumferential direction, fixed-side cam recesses located between the fixed-side cam protrusions, and a fixed-side cam connection surface connecting the fixed-side cam protrusions and the fixed-side cam recesses,
the movable hinge member includes a movable cam member, the movable cam member including a plurality of movable cam protrusions provided in a circumferential direction and engaging with the fixed cam recesses, movable cam recesses located between the movable cam protrusions and receiving the fixed cam protrusions, and a movable cam connection surface connecting the movable cam protrusions and the movable cam recesses,
a movable cam recess and a movable cam connection surface, the movable cam protrusion and the movable cam connection surface being formed in an arc-like shape such that when the movable cam member rotates, the movable cam connection surface slides in surface contact with the entire fixed cam connection surface. 2. The movable side cam protrusion enters the fixed side cam recess when the door is closed, and the fixed side cam protrusion enters the movable side cam recess . Door hinge structure. 3. The door hinge structure according to claim 2 , wherein when the door is closed, the fixed side cam connection surface and the movable side cam connection surface are held in contact with each other .

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