JPH11248341A - Door device for storage cabinet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the abrasion of the cam surface of a collar constituting a lift hinge for a long period. SOLUTION: A hinge pin 27 is erected on a hinge plate 18 protruded from the lower margin of the outlet/inlet of the main body of a door and rotatably supported in a state where the pin 27 is passed through a bearing hole formed through the lower edge of the door. A pin-side collar 47 having a cam surface 50 on which recessing and projecting sections are formed in the peripheral direction is attached around the pin 27 and a hole-side collar having a cam surface which is meshed with the cam surface 50 is provided to the margin of the bearing hole. The door is opened and closed while the door is raised and lowered by the rotations of the cam surfaces relatively to each other. A retaining hole 55 for retaining the grease applied to the pin 27 is dug into the projecting section 51 of the lower cam surface 50. The grease collected in the hole 55 is suitably supplied to the cam surface 50 of the collar 47 to prevent the abrasion of the cam surface 50 and the production of abnormal sounds for a long period.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage door device provided with a so-called lift hinge mechanism.

[0002]

2. Description of the Related Art A refrigerator provided with a lift hinge mechanism in a door device of a refrigerator is known, for example, from Japanese Utility Model Laid-Open No. 60-12180. Briefly explaining the lift hinge mechanism, a support plate protrudes from the lower edge side of the doorway of the refrigerator body, a hinge pin is erected upward therefrom, and the hinge pin is freely rotatably inserted into the lower edge of the door that opens and closes the doorway. A bearing hole is formed. At the same time, a pair of synthetic resin collars is provided around the hinge pin and around the hole of the bearing hole, and a cam surface having an uneven shape engaging with each other is formed on the opposing surfaces of both collars. The door is opened and closed while moving up and down by the relative rotation of the two collars. For example, when the door is rotated toward the closed position in a state where the door is raised, and when the closed position is reached, the door is moved down in accordance with the cam surface, thereby applying a turning force to the door in the closing direction. It functions to assist the closing operation of the door to realize a secure closing.

[0003]

However, the collar described above is liable to be worn because the cam surfaces are in sliding contact with each other while frequently getting on and off the other party. Conventionally, grease was applied to the hinge pin to prevent wear.However, the greased portion is open and easily flows to the outside. There is a problem that wear of the steel is easy to progress. The present invention has been completed on the basis of the above circumstances, and an object of the present invention is to prevent wear of a cam surface of a collar constituting a lift hinge for a long time.

[0004]

According to a first aspect of the present invention, a door for opening and closing the entrance is provided with a hinge pin inserted through a bearing hole. While being supported rotatably about the vertical axis, around the hinge pin and the hole edge of the bearing hole,
A cam provided with a pair of collars each having a cam surface having an uneven shape that meshes with each other on an opposing surface, wherein the door is opened and closed while moving up and down by relative rotation of the two collars. The surface is characterized in that a storage hole for storing lubricating oil is formed. A second aspect of the present invention is characterized in that, in the first aspect of the invention, the storage hole is provided in a convex portion on the cam surface.

[0005]

<Operation and effect of the invention><Invention of claim 1> The lubricating oil stored in the storage hole is appropriately supplied to the cam surface of the collar, and the wear of the cam surface and the generation of abnormal noise can be prevented for a long time. Can be prevented. <Invention of claim 2> Particularly, since the storage hole can be formed deeply in the convex portion, a large amount of lubricating oil can be stored.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
20 will be described with reference to FIG. In this embodiment, a four-door refrigerator is illustrated. As shown in FIG. 1, the refrigerator main body 1 is formed from a heat-insulating box body having an open front surface, and is supported by legs 2 provided at four corners on the bottom surface. The interior is a storage room 3. A cross-shaped partition frame 6 is provided in the opening 5 on the front surface, and a total of four doorways 7 are formed at the top, bottom, left and right, and each door 7 is provided with a door 8 in a double-opening manner as described in detail later. It is installed. On the other hand, a machine room 10 is provided on the upper surface of the refrigerator main body 1, and a refrigeration unit 11 including a compressor 12, a condenser 13, and the like is installed therein, and a cooler arranged on a ceiling or the like of the storage room 3. (Not shown) and a refrigerant pipe to form a well-known refrigeration cycle. Then, the inside of the storage room 3 is maintained at a substantially constant cooling temperature by the control operation of the refrigeration unit 11, and while the door 8 is opened and closed, the stored items are stored on the shelf network 15 arranged in the storage room 3 from the entrance 7. It is designed to be put in and out. In FIG. 1, the door 8 is shown in a widely opened state for easy understanding of the entire structure. However, in this embodiment, the door 8 is restricted to an opening angle of 100 degrees.

Next, the opening and closing support structure of the door 8 will be described. The four doors 8 are arranged as described above, but since their support structures are the same, the following description will focus on the support portion of the upper left door 8 as viewed from the front. Door 8
The upper edge and the lower edge of the left edge are hinge mechanisms 1 respectively.
It is supported via 6,17. First, the lower hinge mechanism 17 will be described. The lower hinge mechanism 17 includes a main body side hinge plate 18 as shown in FIG. The hinge plate 18 is made of a steel plate, and a horizontal support portion 20 is formed at a lower edge of a vertically oriented mounting portion 19 by bending the support portion 20 at right angles. ) Is gradually formed wider. One circular screw insertion hole 21 is formed at the outer end of the mounting portion 19, and a long screw insertion hole 2 is formed near the inner end.
2 are formed side by side.

On the other hand, two mounting holes 24 for mounting hinge pins 27 are provided at predetermined positions in the front-rear direction (in the direction perpendicular to the mounting portion 19) at positions near the outer end of the support portion 20. It is open. Also, the mounting hole 24 on the back side
An insertion hole 25 for attaching a collar is formed at a position further deeper and shifted outward. Further, a step-shaped locking portion 26 is formed at the outer end of the front edge of the support portion 20. The hinge pin 27 has a shape in which a flange 28 and a cylindrical caulked portion 29 are formed on one end side. The hinge pin 2 is inserted into the mounting hole 24 on the front side.
7 is inserted from above, the flange 28 is abutted, and the edge of the caulking portion 29 protruding to the lower surface side is caulked so as to expand outward, and is engaged with the lower hole edge of the mounting hole 24. By being stopped, the hinge pin 27 is fixed upward. Note that a hinge pin 27 is inserted from below into the mounting hole 24 on the rear side, is caulked similarly, and is fixed downward. The downward hinge pin 27 constitutes a part of the upper hinge mechanism of the lower left door 8.

The upper hinge mechanism 16 of the upper left door 8
In this embodiment, a hinge plate 18 similar to the above is used, and a hinge pin 27 is fixed by caulking downward only to the mounting hole 24 on the back side. In the lower hinge mechanism portion of the lower left door 8, a hinge pin 27 is fixed by caulking upward in the mounting hole 24 on the near side of the same hinge plate 18. Further, as a hinge plate constituting a hinge mechanism of the right door 8, a hinge plate 18A (see FIG. 9) having a left-right symmetric shape is provided, and a hinge pin 27 is set up in the same manner as described above. I have. Since the hinge plates 18 and 18A are formed in a symmetrical shape in this manner, for example, the upper hinge mechanism 16 of the upper left door 8 has the hinge plate 18A turned upside down as shown in FIG. As the posture, the mounting hole 24 on the back side
Only the hinge pin 27 can be used by caulking and fixing the hinge pin 27 downward.

The hinge plate 18 is attached to the main body 1 as follows. First, the structure of the upper left corner on the front surface of the main body 1 will be described with reference to FIGS. On the left side wall side of the main body 1, the front edge of the outer box 30 is bent inward at right angles to form a vertical frame 31, and the front end thereof is further bent at right angles to form a bent portion 32. On the other hand, the front edge of the inner box 33 corresponds to the bent portion 32 with a predetermined space therebetween, and the decorative frame 3 is formed so as to cover the groove.
The left side surface of the opening 5 is formed by fitting 4. The inside of the upper end of the bent portion 32 of the vertical frame 31 (FIG. 4)
On the right side of the figure, a front frame 35 is provided. Side plates are erected on four edges of the front frame 35, and a left side plate 35 </ b> A abuts the bent portion 32 of the vertical frame 31. The lower side plate 35B of the front frame 35 is
The upper surface of the opening 5 is formed by fitting the decorative frame 36 so as to cover the groove with the front edge formed in a step shape of the ceiling surface at a predetermined interval. .
Then, the top plate 37 is covered over the entire upper surface, and the front frame 3
5 is fixed to the upper side plate 35C or the like by screws 38, and a heat insulating material made of a foamed resin is foam-filled in the hollow, thereby forming the above-described heat insulating box.

In the upper left corner of the main body 1, a hinge plate 1
A pair of mounting plates 40A and 40B for mounting the mounting plate 8 are provided. These mounting plates 40A and 40B are formed in an L-shape in which a connecting portion 41 is bent at a right angle at one end.
1 and the rear surface of the front frame 35 respectively. One screw hole 4 is provided in the mounting plate 40A on the vertical frame 31 side.
2, and two screw holes 42 are formed in the mounting plate 40B on the front frame 35 side. Also, both mounting plates 40
Two rivet holes 43 are formed in the upper and lower two rivet holes 43 in the connecting portions 41 of A and 40B, respectively. Both mounting plates 4 described above
0A and 40B are applied to the back surfaces of the vertical frame 31 and the front frame 35 before the heat insulating material is filled, and the respective connecting portions 41 are bent at the bent portions 32 of the vertical frame 31 and the left side plate 35 of the front frame 35.
A is fixed by rivets 44 using the rivet holes 43 in a state sandwiching A.

The mounting portion 19 of the hinge plate 18
Is applied to the front surface of the portion where the mounting plates 40A and 40B are arranged, and the screw 45 is inserted through the insertion holes 21 and 22 of the mounting portion 19.
Is screwed into the screw holes 42 of the mounting plates 40A and 40B and tightened, so that the support portion 20 is mounted in a horizontal posture. At the other three corners of the opening 5, the hinge plate 18 (18A) is attached via the similarly arranged attachment plates 40A and 40B, and the partition frame 6 is provided.
The mounting plate 40 on which the hinge plates 18 (18A) are similarly arranged at the intersections of the left and right ends and the vertical frame 31.
A, attached via 40B.

As described above, the hinge plate 18 (18A)
Is fixed to each of the mounting plates 40A, 40B disposed over the vertical frame 31 and the front frame 35 (the partition frame 6) with the screws 45, so that when a load is applied to the hinge plate 18 (18A), It is dispersed on the side of the vertical frame 31 and the side of the front frame 35 (partition frame 6), thereby providing a strong mounting structure.
Further, since the mounting plates 40A and 40B are arranged at the corners of the opening 5, a structure that is resistant to kinking and twisting at the corners is obtained. When the hinge plate 18 is attached as described above, the upper hinge pin 27 for each door 8
And the lower hinge pin 27 is arranged in such a state that the lower hinge pin 27 projects forward more than the upper hinge pin 27 (see FIG. 18).

The hinge plate 18 is provided with a pin-side hinge collar 47 (hereinafter, referred to as a pin-side collar). The pin-side collar 47 is formed of a synthetic resin material into a planar shape shown in FIG.
That is, the base end has an arc shape, the width is gradually increased tangentially from both sides of the center line X, and the width is gradually narrowed toward the distal end. At the center of the base-side circle, an insertion hole 48 for inserting the above-mentioned hinge pin 27 with a slight clearance is opened. A planar annular cam surface 50 is formed around the surface of the insertion hole 48. On the cam surface 50, three convex portions 51 are formed at equal angular intervals, and the convex portions 51 extend over an angle range of 40.5 degrees. On both sides of each convex portion 51, a slope portion 53 having a downward slope in an angle range of 12 degrees is formed, and an adjacent slope portion 53 is formed.
The angle range of 55.5 degrees between them is the recess 52. The cam surface 50 has one projection 51 located at the center of the base end, and is symmetrical with respect to the center line X.

Here, a storage hole 55 for storing grease is formed in the surface of each convex portion 51. The storage hole 55 is formed to have a depth corresponding to the height of the projection 51. A pair of rattling stoppers 57 are formed on the inner peripheral surface of the insertion hole 48 at a position slightly shifted to the distal end side from a position intersecting the center line orthogonal to the center line X.

On the back side of the pin side collar 47, as shown in FIG. 7, a fitting recess 58 into which the flange 28 of the hinge pin 27 fits is formed at the edge of the insertion hole 48, and is located at the center position. Has a long hole-shaped relief concave portion 59 into which the swaged portion of the hinge pin 27 is fitted and released.
At the front end side, an insertion piece 60 to be inserted into the insertion hole 25 of the hinge plate 18 is protruded, and on both side surfaces of the front end, a hook portion 61 which is engaged with a hole edge of the insertion hole 25 is provided. Is formed.

As shown in FIG. 8, in the pin-side collar 47, the insertion hole 48 is inserted into the upward hinge pin 27, the insertion piece 60 is inserted into the insertion hole 25, and the hook 61 at the tip is By being locked to the hole edge on the back side of the insertion hole 25, it is attached in a retaining state. At this time, as shown on the left side of FIG. 9, the pin-side collar 47 is attached with its tip slightly swung outward (left side). on the other hand,
As for the right hinge side, as shown on the right side of the figure, the pin side collar 47 is attached to the hinge plate 18A with its tip slightly swung rightward. in this way,
The mounting of the pin-side collar 47 by swinging it in the opposite direction on the left and right is based on the following reason. That is, since the opening directions of the doors 8 are opposite on the left and right sides, if the pin-side collars are mounted in the same mounting posture on the left and right, it is necessary to provide separate cam surfaces in accordance with the vertical movement timing of the left and right doors 8. . That is, dedicated pin side collars are required on the left and right. In this regard, in this embodiment, as described above, the pin-side collar 47 is
It is formed so as to be symmetrical with respect to the center line X connecting the center of the insertion hole 48 and the insertion piece 60, including the cam surface 50. , The required position of the cam surface 50 is set on the left and right. That is, a common pin-side collar 47 can be used for the left and right sides. Similarly, the pin side collar 4 is also provided on the hinge plates 18, 18A of the lower left and lower right doors 8.
7 is attached. In addition, the insertion hole 48 is the hinge pin 2
7, the backlash protrusion 57 is crushed and press-fitted, whereby the pin-side collar 47 is inserted into the hinge pin 27 without rattling in a direction substantially orthogonal to the center line X. Around the ring-shaped cam surface 5
0 is arranged in a predetermined rotation posture.

The door 8 is an insulated door, and is roughly shown in FIG.
As shown in the figure, a door body 6 in the form of a box having a shallow bottom and an open back surface.
3, a heat insulating material such as urethane foam resin is foam-filled, and a back plate 64 made of synthetic resin is stretched on the back surface.
A packing 65 enclosing a magnet is arranged along the periphery of the back plate 64. Such a door 8
A hinge collar 80 (hereinafter, referred to as a hole-side collar) on the bearing side is attached to each of the upper and lower ends of a side edge on the rotation center side of the shaft. Similarly, the description will be focused on the upper left door 8.

As shown in FIG. 11, an oval fitting hole 67 is opened in the upper and lower surfaces of the door body 63 at a position close to the side edge on the rotation center side. Two holes 68 are formed side by side. A hinge plate 70 on the door side is attached to the upper and lower corners of the side edge. As shown in the figure, the hinge plate 70 has a shape in which a side plate 72 is bent at a right angle from edges that are orthogonal to each other on a right isosceles triangular substrate 71. At the position close to the corners of both side plates 72 of the hinge plate 70, a similarly oblong fitting hole 73 is formed which is aligned with the above-described fitting hole 67 of the door main body 63.
A screw hole 74 that is aligned with the third insertion hole 68 is formed.

The above-mentioned hinge plate 70 is fitted to the lower corner of the door body 63, and as shown in FIG. 12, a mounting plate 75 is applied to the lower surface of the door body 63 and formed there. The screw 77 that has passed through the insertion hole 76 that has passed through the insertion hole 68 on the lower surface of the door body 63 passes through the hinge plate 70.
And is fixed by screwing into the screw hole 74. The lower mounting plate 75 has an L-shape, and its hanging portion serves as a stopper 78 that abuts against the locking portion 26 of the hinge plate 18 on the main body. When the hinge plate 70 is attached, the door body 63 and the hinge plate 70 fitting holes 67 and 73 are aligned and opened. At the position of the upper corner of the door 8, as shown in FIG. 11, the hinge plate 70 is fitted in a 90-degree direction, and a flat mounting plate 75 </ b> A is applied to the upper surface of the door body 63, so that the mounting plate 75 And the insertion hole 76 of the door body 63,
From 68, it is fixed by inserting a clip 79 having a plurality of locking pieces 79A into a screw hole 74 of the hinge plate 70. Note that the mounting plate 75A may be omitted.

A hole-side collar 80 is mounted in the fitting holes 67 and 73 described above. As shown in FIGS. 13 and 14, the hole-side collar 80 is formed of a synthetic resin material in the shape of a plane-oval block, and a flange 81 is formed on the peripheral edge of the surface. On the surface of the hole-side collar 80, two dead-end bearing holes 82 are formed side by side so that the hinge pin 27 can be inserted. The interval between the two bearing holes 82 is the same as the interval between the mounting holes 24 of the hinge pin 27.

Around the two bearing holes 82, cam surfaces 83 each having a planar ring shape are formed. Both cam surfaces 83
Is the projection 8 in the same angle region as the pin side collar 47.
4. The inclined portion 86 and the concave portion 85 are formed repeatedly in the circumferential direction. However, the center of the concave portion 85 is set at the position where the center line passes at both ends in the length direction. As shown in FIG. 14, a pair of ribs 88 are formed on both side surfaces of the hole-side collar 80 at point-symmetric positions from the lower surface of the flange 81 to a predetermined dimension thereunder. Then, as shown in FIG.
The hole-side collar 80 is inserted into the 73 with the bearing hole 82 opened downward, and the flange
Is pressed and fixed until it hits the lower surface of the door body 63. Similarly, the upper side fitting holes 67 and 73 have hole side collars 8 respectively.
0 is pushed in with the bearing hole 82 opened upward and fixed.

After the hole-side collar 80 is mounted as described above, the door body 63 is filled with a foamed resin. At this time,
A closing body 90 is fitted to a corner of the door body 63 to which the hole-side collar 80 is attached. The closing body 90 is formed in advance by styrofoam, and has a block shape which is in close contact with both surfaces orthogonal to the above-mentioned corners as shown in FIGS. Into which the recess 91 is formed. The meaning of fitting the closing body 90 is that the hole side collar 80 and the fitting hole 6 are fitted.
This is to prevent the foamed resin from leaking from between the gaps 7 and 73. When the closing body 90 is not used, for example, it is necessary to apply putty or the like around the hole side collar 80, which is troublesome, and if the putty is applied and hardened, the hole side collar 80 cannot be replaced. . In that respect, when the closing body 90 is adopted, it can be easily mounted simply by being fitted, and only covers the periphery of the hole-side collar 80. Therefore, even when the hole-side collar 80 needs to be replaced, Can be replaced relatively easily.

As described above, the door body 63 is foam-filled with the foamed resin in a state where the hole-side collar 80 is covered by the closing body 90, and then the back plate 64 is stretched as described above. A packing 65 is mounted around the periphery. A handle 93 (see FIG. 1) is attached to a predetermined position of the door main body 63 to complete the door 8. In addition, when the completed door 8 is leaned, if the side on which the mounting plate 75 with the stopper 78 is provided is leaned down, the stopper 78 hits a floor surface or the like, and is mounted at a position further retracted than that. The perforated side collar 80 is protected.

The door 8 thus formed is supported by upper and lower hinge mechanisms 16, 17 as shown in FIG. In FIG. 17, the heat insulating material and the like on the door 8 side are omitted. That is, a bearing hole 82 on the near side of the lower surface of the door 8 (left side in the figure) is fitted to the hinge pin 27 protruding upward from the lower hinge plate 18, and the inner side of the upper surface of the door 8 ( A hinge pin 27 protruding downward from the upper hinge plate 18 is fitted into a bearing hole 82 (on the right side in the figure). At this time, grease is applied around each hinge pin 27. When the doors 8 are attached in this manner, as shown in FIG. 18, the lower side of each door 8 projects a predetermined amount between the position of the upper hinge pin 27 and the position of the lower hinge pin 27. Eccentric. A cam surface 83 of a hole-side collar 80 provided on the lower surface of the door 8;
Pin-side collar 4 provided on lower hinge plate 18
7, but the door 8 is closed (FIG. 19 (A)) and opened 100 degrees (FIG. 19 (C)). The setting is such that the recess 84 engages with the recesses 52 and 85.

Next, the operation of the present embodiment will be described. For example, when the upper left door 8 viewed from the front is opened from the closed state, the cam surface 83 of the hole side collar 80 in the lower hinge mechanism 17 is viewed from above on the cam surface 50 of the pin side collar 47. Rotate clockwise. That is, the upper cam surface 83 moves in the direction of the arrow in FIG. 19A. For example, as shown in FIG. The door 8 rides on the convex portion 51A, and the door 8 is opened while rising. When opened at a predetermined angle, the upper convex portion 84B slides down from the inclined portion 53 to the adjacent concave portion 52C side beyond the lower convex portion 51A.
At the time of opening by 00 degrees, the upper convex portion 84 fits into the lower concave portion 52 as shown in FIG. 9C, and at the same time, the stopper 78 provided on the mounting plate 75 as shown in FIG. The door 8 is held in an open state of 100 degrees by abutting against the locking portion 26 of 18. Since the stopper 78 formed on the mounting plate 75 made of steel plate abuts against the locking portion 26 formed on the hinge plate 18 also made of steel plate, the opening operation of the door 8 is restricted, so that the collar is formed. An excessive load is not applied to the cam surfaces 50 and 83 of the 47 and 80. Further, since the stopper 78 is brought into contact with the locking portion 26 in a state where the door 8 is lowered, the hanging length of the stopper 78 may be short, and the strength of the stopper 78 can be increased accordingly.

When the door 8 is closed from the open state, the upper cam surface 83 rotates counterclockwise as viewed from above. In this case, the upper cam surface 83 moves in the direction of the arrow from the state shown in FIG. 19C, and for example, the convex portion 84B follows a path reverse to that at the time of opening. As shown in ()), the vehicle rides on the convex portion 51A of the lower cam surface 50 from the inclined portion 53, and the door 8 is closed while rising. At this time, even if the closing force is removed, as described above, the lower support position of the door 8 protrudes forward from the upper support position and is eccentric. Is turned on and is automatically closed.

When the door 8 is turned to the closed position, the convex portion 84 of the upper cam surface 83 is in a state of sliding down to a position halfway of the inclined portion 53 as shown in FIG. For this reason, a force for lowering and closing the door 8 acts on the door 8, and as a result, the packing 65 on the back surface of the door 8 is firmly pressed against the opening edge of the entrance 7, and is securely closed in a sealed manner. .

Since the pin-side collar 47 is formed by molding a synthetic resin material as described above, it is difficult to obtain dimensional accuracy. Therefore, for example, the insertion hole 48 is
7 has to be formed so as to have some clearance. On the other hand, when the convex portion 84 of the upper cam surface 83 gets on and off the convex portion 51 of the lower cam surface 50 from the inclined portion 53 with the opening / closing operation of the door 8, the lower pin side collar 47 has a center. A moving force in a direction substantially perpendicular to the line X acts. At this time, if there is play between the hinge pin 27 and the insertion hole 48, there is a concern that the inner surface of the insertion hole 48 may hit the hinge pin 27 and generate abnormal noise each time the above-described moving force is received.

In this respect, in this embodiment, the backlash protrusions 57 provided on substantially both sides of the center line X of the inner surface of the insertion hole 48 are press-fitted, and the backlash in the direction of receiving the moving force of the pin side collar 47 is pressed. Therefore, the generation of the abnormal noise as described above is prevented. Further, if the projections as described above are provided over the entire circumference of the insertion hole 48, for example, when the dimensions between the insertion hole 48 and the insertion piece 60 cannot be accurately obtained, the insertion piece 60 is inserted. There may be a case where it cannot be inserted into the hole 25 properly. In this respect, no projection is provided in the direction along the center line X, and the movement of the pin-side collar 47 is allowed in that direction. Can be inserted securely.

The upper and lower cam surfaces 83 and 50 rub against each other every time the door 8 is opened and closed.
4, 51 corners are easily worn. Therefore hinge pin 2
Although grease is applied to 7, there is a concern that the grease may flow out early because it is open to the outside. In this respect, in the present embodiment, the storage hole 55 is formed in the projection 51 of the lower cam surface 50.
Is formed, a part of the applied grease is stored in the storage hole 55, and even if the grease around the hinge pin 27 flows out, the grease stored in the storage hole 55 is appropriately removed from the cam surface 50, It exudes during 83 and functions as a lubricant.

As described above, according to the present embodiment,
Since the storage hole 55 which can store grease is formed in the cam surface 50 of the lower pin side collar 47, grease can be appropriately leaked out to the cam surfaces 50 and 83 to function as a lubricant. That the surfaces 50 and 83 are worn,
Generation of abnormal noise can be prevented for a long period of time. In particular, since the storage hole 55 is formed in the convex portion 51 of the cam surface 50, a large depth can be obtained and a large amount of grease can be stored.

<Other Embodiments> The present invention is not limited to the embodiments described above with reference to the drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition, various changes can be made without departing from the scope of the invention. (1) The hinge mechanism may have a structure in which a hinge pin is provided on a door side and a bearing hole is provided on a main body side. (2) The present invention can be widely applied not only to refrigerators but also to general door devices for storages equipped with a lift hinge mechanism such as a refrigerator-freezer, a refrigerator, a constant-temperature and high-humidity refrigerator, and the like.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a refrigerator according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a hinge plate and a hinge pin on a main body side.

FIG. 3 is a perspective view showing another example of use of the hinge plate.

FIG. 4 is a cross-sectional plan view showing a hinge plate mounting structure.

FIG. 5 is a longitudinal sectional view of the same.

FIG. 6 is a plan view of a pin-side collar.

FIG. 7 is a perspective view in which the front and back are reversed.

FIG. 8 is a perspective view showing a mounting structure of a pin-side collar.

FIG. 9 is a plan view showing the mounting posture of the left and right pin side collars.

FIG. 10 is an exploded perspective view of a door.

FIG. 11 is an exploded perspective view of a corner of a door.

FIG. 12 is an exploded perspective view showing a mounting structure of a hinge plate on a door side.

FIG. 13 is a plan view of a hole-side collar.

FIG. 14 is a perspective view of the same.

FIG. 15 is an exploded perspective view showing a mounting structure of the closing body.

FIG. 16 is a perspective view seen from the back of the closure.

FIG. 17 is an exploded perspective view showing the upper and lower hinge structures.

FIG. 18 is a sectional view showing a support state of the door.

FIG. 19 is an expanded sectional view showing an engaged state of a cam surface.

FIG. 20 is a plan view showing the operation of the stopper.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Refrigerator main body 5 ... Opening 7 ... Doorway 8 ... Door 1
7 Hinge mechanism 18 Hinge plate 27 Hinge pin 47 Pin side collar 50 Cam surface 51 Convex part 52 Concave part 55 Storage hole 70 Hinge plate
80: Hole side collar 82: Bearing hole 83: Cam surface 84
… Convex part 85… concave part

Claims (2)

[Claims] A door that opens and closes the door is supported rotatably about a vertical axis by inserting a hinge pin into a bearing hole at an entrance of the storage main body. A pair of collars having a cam surface having a concave and convex shape that meshes with the facing surface on the edge of the hole, and the door is opened and closed while moving up and down by the relative rotation of the two collars. A storage hole for storing lubricating oil is formed in a cam surface of the collar on the side of the door; 2. The storage door device according to claim 1, wherein the storage hole is provided in a convex portion on the cam surface.