JP7411605B2 - door hinge structure - Google Patents

Description

The present invention relates to a door hinge structure in which a pair of doors that respectively open and close upper and lower openings of a storage such as a refrigerator or a freezer are swingably supported by three hinges: an upper hinge, a middle hinge, and a lower hinge.

This type of door hinge structure is disclosed in Patent Document 1, for example. The door hinge structure of Patent Document 1 includes a first door support member (upper hinge) that supports the upper right corner of the upper door, the lower right corner of the upper door, and the upper right corner of the lower door. A second door support member (middle hinge) that supports the lower door, and a third door support member (lower hinge) that supports the lower right corner of the lower door. The first door support member includes a downwardly extending hinge pin, the second door support member includes an upwardly extending hinge pin and a downwardly extending hinge pin, and the third door support member includes an upwardly extending hinge pin. Each hinge pin is inserted into a pin hole formed in the door, and each door is pivotally supported at the top and bottom by the hinge pin, and is supported around the hinge pin so as to be able to swing open and close. The central axes of each hinge pin are coaxial when viewed from the front.

JP 2021-17742 Publication

In a door hinge structure in which the door is supported by a hinge pin inserted into a pin hole, as in Patent Document 1, in order to smoothly swing and open/close the door, the hinge pin and the pin, which are sliding parts, are A clearance is provided between it and the hole, and this clearance reduces friction between the two during sliding. However, because of the clearance, there is room for the door to move slightly even though it is supported, and when the door is in the closed position, the tip of the swing moves downward using the hinge pin that supports the bottom of each door as a fulcrum. The entire door may tilt. In Patent Document 1, when the door is tilted, the door is supported in a slightly counterclockwise rotated state when viewed from the front, and the positions of the lower left corner of the upper door and the upper left corner of the lower door are shifted in the left-right direction. As a result, the appearance of the storage shed is spoiled. In addition, in a so-called center-free storage warehouse that has a pair of left and right doors on the top and bottom that open and close in a double-sided pattern, magnets extend vertically on the opposing surfaces of the left and right doors at the swinging tips and attract each other to each other. Although it is equipped with a sealing member, if the left and right doors were tilted, the gaps between the opposing surfaces of the doors would be different on the upper and lower sides, which could cause the sealing member to not function properly, and there was a risk that the insulation performance of the storage room would deteriorate. .

An object of the present invention is to provide a door hinge structure that can suppress the door from tilting in the closed position and prevent the appearance of the storage from being spoiled or the heat insulation performance from deteriorating.

The present invention is directed to a door hinge structure that swingably supports upper and lower doors 16 and 17 that open and close upper and lower openings 14 and 15 formed on the front surface of the storage main body 5. The door hinge structure includes an upper hinge 23 that is arranged at the upper edge corner of the upper door 16 and includes an upper hinge pin 27 that extends downward and pivotally supports the upper side of the upper door 16, and an upper hinge 23 that is arranged at the lower edge corner of the lower door 17. and is arranged between a lower hinge 24 including a lower hinge pin 30 extending upward and pivotally supporting the lower side of the lower door 17, a lower edge corner of the upper door 16 and an upper edge corner of the lower door 17, The middle hinge 25 includes an upper middle hinge pin 35 that extends upward and pivotally supports the lower side of the upper door 16, and a lower middle hinge pin 36 that extends downward and pivots the upper side of the lower door 17, and the upper and lower doors 16 and 17. pin holes 47 are formed at the upper and lower corners of each of the pin holes 47 to receive each of the hinge pins 27, 30, 35, and 36 with a predetermined clearance. The upper hinge pin 27 and the lower hinge pin 30 are arranged so that the central axis C1 of the upper hinge pin 27 and the central axis C2 of the lower hinge pin 30 are arranged on the hinge axis CA defined by a vertical axis when viewed from the front. The upper middle hinge pin 35 is disposed such that its center axis C3 is inclined toward the swinging tip side of the upper door 16 in the closed position with respect to the hinge axis CA, which is a vertical axis. The lower middle hinge pin 36 is disposed such that its center axis C4 is inclined toward the swing base end of the lower door 17 in the closed position with respect to the hinge axis CA, which is a vertical axis. The upper end peripheral edge of the upper middle hinge pin 35 is in contact with the inner surface of the pin hole 47 on the swinging tip side, and the lower end peripheral edge of the lower middle hinge pin 36 is configured so as to be in contact with the inner surface of the pin hole 47 on the swinging base end side. It is characterized by being

A configuration including an axis adjustment mechanism for adjusting the tilted postures of the upper middle hinge pin 35 and the lower middle hinge pin 36 with respect to the hinge axis CA, which is a vertical axis, can be adopted.

The middle hinge 25 includes a middle hinge plate 34 formed into an L-shaped cross section by support plates 32 that are long in the left and right horizontal directions, and a mounting plate 33 that extends in the vertical direction, and an upper middle hinge plate 34 that is formed on the upper surface of the support plate 32. A hinge pin 35 and a lower middle hinge pin 36 provided on the lower surface of the support plate 32 are provided. A configuration is adopted that includes a rotation center shaft 39 that supports the left and right swinging base ends of the hinge plate 34 and extends in the front-rear direction, and an adjustment shaft 40 that supports the left and right swinging ends of the middle hinge plate 34. be able to.

The adjustment shaft 40 is an adjustment screw 42 made of a screw body having a screw shaft 42a screwed into the storage main body 5 via the mounting plate 33, and an operation head 42b having a larger diameter than the screw shaft 42a, and the shaft adjustment mechanism is , includes an elongated adjustment hole 44 that is opened in the mounting plate 33, receives the screw shaft 42a of the adjustment shaft 40, and allows the middle hinge plate 34 to swing in the vertical direction about the rotation center axis 39. be able to.

In the door hinge structure of the present invention, the center axis C1 of the upper hinge pin 27 and the center axis C2 of the lower hinge pin 30 are arranged on the hinge axis CA defined by the vertical axis in front view. On the other hand, the upper middle hinge pin 35 is arranged so that its center axis C3 is inclined toward the swinging tip side of the upper door 16 in the closed position with respect to the hinge axis CA, which is the vertical axis. The upper peripheral edge portion is configured to be in contact with the inner surface of the pin hole 47 on the swinging tip side. In addition, the lower middle hinge pin 36 is arranged so that its central axis C4 is inclined toward the swing base end of the lower door 17 in the closed position with respect to the hinge axis CA, which is the vertical axis, so that the lower middle hinge pin 36 The lower end peripheral edge of the pin hole 47 is configured to be in contact with the inner surface of the swing base end side.

When the hinge pins 27, 30, 35, and 36 are arranged in the above arrangement, the upper door 16 has the upper hinge pin 27 as a fulcrum, and the lower side of the upper door 16 is pivoted by the upper middle hinge pin 35. The upper door 16 can be tilted and displaced in the opposite direction to the direction in which the upper door 16 is tilted due to its own weight by moving the upper door 16 to the side and swinging the swinging tip side of the upper door 16 upward. ). Similarly, in the lower door 17, using the lower hinge pin 30 as a fulcrum, the upper side of the lower door 17 is moved toward the swinging base end side by the lower middle hinge pin 36, and the swinging tip side of the lower door 17 is swung upward. By moving the lower door 17, the lower door 17 can be tilted and displaced in a direction opposite to the direction in which the lower door 17 is tilted due to its own weight (see FIG. 5). As described above, according to the door hinge structure 22 of the present invention, the inclination of the upper and lower doors 16 and 17 due to their own weight is offset by the tilting displacement of the upper and lower doors 16 and 17 by the upper middle hinge pin 35 and the lower middle hinge pin 36. be able to. Therefore, according to the present invention, it is possible to maintain the upper and lower doors 16, 17 in proper postures, and to prevent the corners of the doors 16, 17 from being misaligned or the sealing member to malfunction. It is possible to prevent the appearance of the storage from being spoiled and the insulation performance from being deteriorated due to the inclination of the upper and lower doors 16 and 17 in the closed position.

If an axis adjustment mechanism is provided for adjusting the inclination angle of the upper middle hinge pin 35 and the lower middle hinge pin 36 with respect to the hinge axis CA, which is the vertical axis, the upper middle hinge pin 35 and the lower middle hinge pin 36 can be By adjusting the inclination angles of the middle hinge pin 35 and the lower middle hinge pin 36, it becomes possible to more easily set the upper and lower doors 16 and 17 in proper postures.

Specifically, the middle hinge 25 includes a middle hinge plate 34 formed into an L-shaped cross section by horizontally long support plates 32 on the left and right, and a mounting plate 33 extending in the vertical direction, and a middle hinge plate 34 formed on the upper surface of the support plate 32. The upper middle hinge pin 35 is provided on the lower surface of the support plate 32, and the lower middle hinge pin 36 is provided on the lower surface of the support plate 32. The adjustment mechanism includes a rotation center shaft 39 that supports the left and right swinging base ends of the middle hinge plate 34 and extends in the front-rear direction, and an adjustment shaft 40 that supports the left and right swinging ends of the middle hinge plate 34. It is possible to take a form that includes the following. According to this, after the middle hinge plate 34 is pivotally supported by the rotation center shaft 39, the middle hinge plate 34 is held in position by the adjustment shaft 40 so that the support plate 32 is tilted downward toward the swinging tip side. Accordingly, the upper middle hinge pin 35 is arranged so that the upper side of the central axis C3 is tilted toward the swinging tip side of the upper door 16 which is in the closed position, and the swinging base end of the lower door 17 is where the lower side of the center axis C4 is in the closed position. The lower middle hinge pin 36 can be arranged in a state where it is tilted to the side. As described above, by changing the posture of the middle hinge plate 34, the postures of the upper middle hinge pin 35 and the lower middle hinge pin 36 can be defined, so that the upper middle hinge pin 35 and the lower middle hinge pin 36 can be tilted more easily. As for the posture, the upper and lower doors 16 and 17 can be set in proper postures.

The adjustment shaft 40 is an adjustment screw 42 made of a screw body having a screw shaft 42a screwed into the storage main body 5 via the mounting plate 33, and an operation head 42b having a larger diameter than the screw shaft 42a, and the shaft adjustment mechanism is , a configuration including an elongated adjustment hole 44 that is opened in the mounting plate 33, receives the screw shaft 42a of the adjustment shaft 40, and allows the middle hinge plate 34 to swing in the vertical direction about the rotation center axis 39. can be taken. According to this, the middle hinge plate 34 can be adjusted by simply operating the adjusting screw 42 loosely, then swinging the middle hinge plate 34 in the vertical direction within the opening range of the adjusting hole 44, and finally tightening the adjusting screw 42. 34 can be in any position. In addition, by simply adjusting the inclination angles of the upper middle hinge pin 35 and the lower middle hinge pin 36, the upper and lower doors 16 and 17 can be placed in proper postures.

FIG. 1 is a partially cutaway front view of the door hinge structure according to the first embodiment of the present invention. FIG. 2 is a front view of a refrigerator to which the door hinge structure is applied. FIG. 3 is a partially cutaway front view showing the middle hinge portion. It is a longitudinal side view of a door hinge structure. It shows the state of the door supported by the door hinge structure according to the present invention, and the two-dot chain line shows the case where the door is tilted due to its own weight. It is a front view which shows the middle hinge part of the door hinge structure based on 2nd Embodiment of this invention.

(First Embodiment) FIGS. 1 to 5 show a first embodiment in which a door hinge structure according to the present invention is applied to a center-free type refrigerator. In this embodiment, forward and backward, left and right, and up and down follow the cross arrows shown in FIGS. 1, 2, and 4, and the indications of front and back, left and right, and up and down written near each arrow. In FIG. 2, a refrigerator (storage) 1 includes a refrigerator main body (storage main body) 5 made of a heat insulating box having two upper and lower refrigerating chambers 3 and 4 separated by an intermediate frame 2. The refrigerator compartments 3 and 4 communicate with each other at the back, and the cooling mechanism responsible for cooling the internal air of both refrigerator compartments 3 and 4 is a compressor 7 installed in a machine room 6 partitioned above the refrigerator main body 5. , a condenser 8, a condenser fan 9, an evaporator 10 installed in the upper part of the refrigerator compartment 3, a blower fan 11, etc.

Inlet/outlet ports (openings) 14 and 15 for the refrigerator compartments 3 and 4 are formed on the front surface of the refrigerator main body 5, and the upper inlet/outlet ports 14 are connected to the left and right upper doors 16 and 16, which are swingably supported in a double-door shape. 16, and the lower loading/unloading port 15 is configured to be openable and closable by left and right lower doors 17, which are swingably supported in a double-door configuration. On the back surfaces of the upper and lower doors 16 and 17, a U-shaped magnet packing 18 and a square frame-shaped magnet seal 19 are provided so as to bridge both ends of the magnet packing 18, respectively. The magnetic packings 18 stick to the front surfaces of the refrigerator main body 5 and the intermediate frame 2 at the edges of the openings 14 and 15, and the magnetic seals 19 and 19 stick to each other, so that each of the refrigerator compartments 3 and 4 is attached to each door 16.・It is closed tightly by 17.

As shown in FIG. 2, when the refrigerator 1 is viewed from the front, a pair of upper and lower doors 16 and 17 arranged on the left side and a pair of upper and lower doors 16 and 17 arranged on the right side each swing by a door hinge structure 22. Supported. The door hinge structure 22 that swingably supports the pair of doors 16 and 17 on the left and the door hinge structure 22 that swings and supports the pair of doors 16 and 17 on the right are left-right and opposite-hand structures, and are as follows. Now, the door hinge structure 22 of the pair of doors 16 and 17 arranged on the left side will be explained. As shown in FIG. 1, the door hinge structure 22 includes an upper hinge 23 disposed at the left corner of the upper edge of the upper door 16, a lower hinge 24 disposed at the left corner of the lower edge of the lower door 17, and a lower hinge 24 disposed at the left corner of the lower edge of the lower door 17. A middle hinge 25 is provided between the left corner of the lower edge of the lower door 17 and the left corner of the upper edge of the lower door 17.

As shown in FIGS. 1 and 4, the upper hinge 23 is formed integrally with an upper hinge plate 26 having an L-shaped cross section and a vertical wall and a horizontal wall, and a lower surface of the horizontal wall of the upper hinge plate 26, and is formed downward. The refrigerator is provided with an extending upper hinge pin 27 in the form of a round shaft, and the vertical wall is fastened and fixed to the upper left edge of the front surface of the refrigerator main body 5 using two fastening screws 28 on the left and right. The lower hinge 24 includes a lower hinge plate 29 with an inverted L-shaped cross section and a vertical wall and a horizontal wall, and a lower hinge pin 30 with a round shaft shape that is integrally formed on the upper surface of the horizontal wall of the lower hinge plate 29 and extends upward. The vertical wall is fastened and fixed to the lower left edge of the front surface of the refrigerator main body 5 using two fastening screws 31 on the left and right sides. The center axis C1 of the upper hinge pin 27 is arranged on the hinge axis CA defined by the vertical axis in front view, and the center axis C2 of the lower hinge pin 30 is also arranged on the hinge axis CA.

As shown in FIGS. 1 and 4, the middle hinge 25 has an inverted cross-section, comprising support plates 32 that are long in the left and right horizontal directions, and a mounting plate 33 that is integrally provided at the rear edge of the support plates 32 and extends in the vertical direction. An L-shaped middle hinge plate 34, a round shaft-like upper middle hinge pin 35 integrally formed on the upper surface of the support plate 32 and extending upward, and a round shaft-like upper middle hinge pin 35 integrally formed on the lower surface of the support plate 32 and extending downward. A lower middle hinge pin 36 is provided. The center axis C3 of the upper middle hinge pin 35 and the center axis C4 of the lower middle hinge pin 36 are arranged along a vertical axis extending from the support plate 32. Further, the center axis C3 of the upper middle hinge pin 35 and the center axis C4 of the lower middle hinge pin 36 are arranged on the same axis when viewed from the front, and are arranged in a state shifted back and forth when viewed from the side. The middle hinge plate 34 has a rotation center shaft 39 provided at the left end of the mounting plate 33 and extending in the front-rear direction, and an adjustment shaft 40 provided at the right end of the mounting plate 33 and extending in the front-rear direction. It is fixed at the center of the left edge of the front. The adjustment shaft 40 holds the middle hinge plate 34 in a vertically oscillating state about the rotation center shaft 39, and the rotation center shaft 39 and the adjustment shaft 40 adjust the upper middle hinge pin 35 and the lower middle hinge pin 36. An axis adjustment mechanism is configured to adjust the tilted posture.

As shown in FIG. 1, the rotation center shaft 39 is composed of a fixing screw 41 made of a screw body having a screw shaft 41a screwed into the front surface of the refrigerator main body 5 and an operation head 41b having a larger diameter than the screw shaft 41a. be done. Similarly, the adjustment shaft 40 is constituted by an adjustment screw 42 that is a screw body having a screw shaft 42a screwed into the front surface of the refrigerator main body 5 and an operation head 42b having a larger diameter than the screw shaft 42a. A fixing hole 43 consisting of a round hole with a diameter slightly larger than the screw shaft 41a of the fixing screw 41 is formed in the mounting plate 33 on the left side of both hinge pins 35 and 36, in other words, in the left end of the mounting plate 33. The mounting plate 33 on the right side of both hinge pins 35 and 36, in other words, the right end of the mounting plate 33 has an adjustment hole that is long in the left and right direction and has a slightly larger hole diameter than the screw shaft 42a of the adjustment screw 42. A hole 44 is opened. Further, both holes 43 and 44 are arranged below the upper end of the upper middle hinge pin 35 and above the lower end of the lower middle hinge pin 36. The middle hinge plate 34 is fastened and fixed to the front surface of the refrigerator main body 5 by screwing the fixing screw 41 into the refrigerator main body 5 through the fixing hole 43 and screwing the adjusting screw 42 into the refrigerator main body 5 through the adjustment hole 44. . In addition, by changing the screwing position of the adjustment screw 42 with respect to the refrigerator main body 5, the attitude of the middle hinge 25 can be changed and the inclined attitude of the upper middle hinge pin 35 and the lower middle hinge pin 36 can be adjusted.

Bearing bodies 48 are fixed to the upper and lower surfaces of the upper door 16 and the lower door 17, respectively, and are provided with non-penetrating pin holes 47 that constitute the door hinge structure 22 and receive the respective hinge pins 27, 30, 35, and 36. . As shown in FIG. 1, each bearing body 48 is formed into a cylindrical shape with a bottom, and a flange portion 49 projecting outward is formed on the opening side of the pin hole 47. As shown in FIG. The bearing body 48 is press-fitted and fixed to each door 16, 17 in such a manner that the portion excluding the flange portion 49 is buried inside each door 16, 17.

Each of the hinge pins 27, 30, 35, and 36 described above is set to have the same diameter, and each pin hole 47 is also set to have the same diameter. The hole diameter of the pin hole 47 is set slightly larger than the diameter of each hinge pin 27, 30, 35, 36, and between each hinge pin 27, 30, 35, 36 and each pin hole 47, each door 16・Clearance is provided to allow smooth opening and closing operations of 17. Note that in the drawings, the clearance is drawn large to clearly express that there is a clearance, and the actual clearance is smaller than what is shown. 1 and 4, reference numeral 50 denotes a collar for reducing the sliding resistance between the flange portion 49 and the middle hinge plate 34, and between the flange portion 49 and the lower hinge plate 29 when the doors 16 and 17 swing open and close. It is. The weight of the upper door 16 is received by the middle hinge 25 via the collar 50, and the weight of the lower door 17 is received by the lower hinge 24 via the collar 50.

As shown in FIG. 4, the central axis C1 of the upper hinge pin 27 that swingably supports the upper door 16 and the central axis C3 of the upper middle hinge pin 35 are at different positions in the front-rear direction. Similarly, the positions of the center axis C4 of the upper middle hinge pin 35 that swingably supports the lower door 17 and the center axis C2 of the lower hinge pin 30 in the front-rear direction are also different. In this way, if the center axes of the hinge pins (upper hinge pin 27 and upper middle hinge pin 35, lower middle hinge pin 36 and lower hinge pin 30) that support the upper and lower sides of each door 16 and 17 are arranged so that the lower side is located on the front side, When each door 16, 17 is swung 90 degrees from the closed state to the opening direction, the height position of the swinging tip of each door 16, 17 becomes higher than the height position of the swinging tip when the door is closed. As a result, when the swinging operation force is released after each door 16, 17 has been swung less than 90 degrees from the closed state, each door 16, 17 is swung in the closed direction by its own weight, and is brought into the closed state. Additionally, if the swing operation force is released after each door 16 and 17 has swung more than 90 degrees from the closed state, each door 16 and 17 will swing in the fully open direction under its own weight and be brought into the fully open state. .

To assemble the upper and lower doors 16 and 17 to the refrigerator main body 5, first, the lower hinge plate 29 of the lower hinge 24 is fastened and fixed to the refrigerator main body 5 using the fastening screws 31. Specifically, as shown in FIG. 4, a nut body 51 is fixed in advance inside the refrigerator main body 5, and by screwing the fastening screw 31 into the nut body 51 via the lower hinge plate 29, The lower hinge 24 is fixed in a predetermined position. When the lower hinge 24 is fixed at a predetermined position, the central axis C2 of the lower hinge pin 30 is coaxial with the hinge axis CA in a front view.

Next, the lower door 17 is attached to the lower hinge 24 so that the lower hinge pin 30 enters the lower pin hole 47 of the lower door 17, and the lower middle hinge pin 36 is inserted into the upper pin hole 47 of the lower door 17. The middle hinge 25 is attached to the lower door 17 so as to penetrate the door. In this state, the fixing screw 41 and the adjusting screw 42 are screwed into the nut body 51 via the mounting plate 33 to fasten and fix the middle hinge 25 to the refrigerator main body 5. At this time, the fixing screw 41 and the adjusting screw 42 are not completely tightened, but are temporarily fixed to such an extent that the mounting plate 33 of the middle hinge 25 can be moved in contact with the refrigerator main body 5.

Next, the upper door 16 is attached to the middle hinge 25 so that the upper middle hinge pin 35 enters the lower pin hole 47 of the upper door 16, and the upper hinge pin 27 is inserted into the upper pin hole 47 of the upper door 16. The upper hinge 23 is attached to the upper door 16 so as to allow entry. In this state, the upper hinge 23 is fixed at a predetermined position by screwing the fastening screw 28 into the nut body 51 via the upper hinge plate 26. When the upper hinge 23 is fixed at a predetermined position, the central axis C1 of the upper hinge pin 27 is coaxial with the hinge axis CA in a front view.

After the upper and lower doors 16 and 17 are assembled to the above state, the middle hinge 25 is permanently fixed. Since there is a slight gap between the screw shaft 41a of the fixing screw 41 and the fixing hole 43, and between the screw shaft 42a of the adjusting screw 42 and the adjusting hole 44, the middle hinge 25 is rotated around the fixing screw 41 (rotation center axis 39). It can be rotated slightly. To fully fix the middle hinge 25, use this to rotate the entire middle hinge 25 clockwise so that the right end of the support plate 32 is inclined downward, and in this state, tighten the fixing screw 41 and the adjusting screw. 42 to permanently fix the middle hinge 25. This completes the assembly of the upper and lower doors 16 and 17 to the refrigerator main body 5 using the door hinge structure 22. Note that the nut body 51 may be provided at a position where the support plate 32 is inclined downward to the right by a predetermined angle.

In conventional refrigerators, the center axis of each hinge pin was arranged on the hinge axis, but in this embodiment, when the upper and lower doors 16 and 17 are assembled, the entire middle hinge 25 is aligned clockwise. It is fixed to the refrigerator main body 5 in a rotated state. From this, the upper middle hinge pin 35 changes from a state in which its center axis C3 is on the hinge axis CA to a state in which the upper side of the center axis C3 is tilted to the right (toward the swinging tip side of the upper door 16 in the closed position). As a result, the upper end peripheral edge of the upper middle hinge pin 35 comes into contact with the inner surface of the pin hole 47, displacing the upper door 16 leftward. In addition, the lower middle hinge pin 36 is in a state where the lower side of the center axis C4 is tilted to the left (towards the rocking base end of the lower door 17 in the closed position) from a state where the center axis C4 is on the hinge axis CA. The lower end peripheral edge of the lower middle hinge pin 36 contacts the inner surface of the pin hole 47 to displace the lower door 17 to the right.

The two-dot chain line in FIG. 5 shows a state in which both the center axes C3 and C4 are arranged coaxially with the hinge axis CA, and each door 16 and 17 is tilted and supported by the door's own weight. In this embodiment, as described above, the central axis C3 of the upper middle hinge pin 35 and the central axis C4 of the lower middle hinge pin 36 are inclined as described above, so that the upper left door 16 has the upper hinge pin 27 as its fulcrum. Then, the lower side thereof moves to the right (swinging tip side) at the upper end of the upper middle hinge pin 35 (see Fig. 3), and the entire upper door 16 is rotated counterclockwise as shown by the solid line in Fig. 5. be able to. In addition, the upper side of the left lower door 17 uses the lower hinge pin 30 as a fulcrum, and its upper side moves to the left (swinging base end side) at the lower end of the lower middle hinge pin 36 (see FIG. 3), and the solid line in FIG. It can be rotated counterclockwise as shown. It should be noted that the upper and lower right doors 16 and 17 have a phenomenon in which the right and left sides are different.

As described above, according to the door hinge structure 22 according to the present embodiment, the inclination of the upper and lower doors 16 and 17 due to their own weight is controlled by the arrangement of the respective hinge pins 27, 30, 35, and 36. Since the tilting displacement of the upper and lower doors 16 and 17 by the middle hinge pin 36 can be offset and the doors 16 and 17 can be set in the proper posture, there is no possibility that the corners of the upper and lower doors 16 and 17 will be misaligned, or that the magnet It is possible to prevent the seal 19 from malfunctioning. Therefore, according to this embodiment, it is possible to prevent the appearance of the storage from deteriorating and the insulation performance from deteriorating due to the inclination of the upper and lower doors 16 and 17 in the closed position.

Since a shaft adjustment mechanism is provided to adjust the inclination angle of the upper middle hinge pin 35 and the lower middle hinge pin 36, the inclination angle of the upper middle hinge pin 35 and the lower middle hinge pin 36 can be adjusted depending on the inclination of the upper and lower doors 16 and 17. can be adjusted. Therefore, the upper and lower doors 16 and 17 can be more easily set in proper postures.

The shaft adjustment mechanism includes a rotation center shaft 39 that supports the left and right swinging base ends of the middle hinge plate 34 and extends in the front-rear direction, and an adjustment shaft 40 that supports the left and right swinging ends of the middle hinge plate 34. After the middle hinge plate 34 is pivotally supported by the rotation center shaft 39, the middle hinge plate 34 is held in position by the adjustment shaft 40 so that the support plate 32 is tilted downward toward the swinging tip side. The inclined postures of the upper middle hinge pin 35 and the lower middle hinge pin 36 can be adjusted simply by Therefore, it is possible to adjust the inclination angle of the upper middle hinge pin 35 and the lower middle hinge pin 36 according to the inclination of the upper and lower doors 16 and 17, and it is possible to more easily set the upper and lower doors 16 and 17 in the proper posture. Can be done.

(Second Embodiment) FIG. 6 shows a second embodiment of the door hinge structure according to the present invention. This embodiment differs from the first embodiment in that the configuration of the adjustment hole 44 has been changed, and the adjustment hole 44 is a long hole that is long in the vertical direction. The middle hinge plate 34 is made to be able to swing in the vertical direction around the central axis 39). According to this, the middle hinge plate 34 can be adjusted by simply operating the adjusting screw 42 loosely, then swinging the middle hinge plate 34 in the vertical direction within the opening range of the adjusting hole 44, and finally tightening the adjusting screw 42. 34 can be in any position. In addition, by simply adjusting the inclination angles of the upper middle hinge pin 35 and the lower middle hinge pin 36, the upper and lower doors 16 and 17 can be placed in proper postures. Further, since the adjustment hole 44 is formed in the shape of a long hole that allows the middle hinge plate 34 to swing in the vertical direction, the range of adjustment of the fixed posture of the middle hinge 25 can be made larger. In addition, since the rest is the same as that of the first embodiment, the same configuration, structure, and member are given the same reference numerals, and the explanation thereof will be omitted.

The door hinge structure of the present invention can be applied to the hinge structure of a swinging door of a storage such as a freezer, a cold storage, a warm storage, or a hot storage, in addition to the hinge structure of a swinging door of a refrigerator shown in each embodiment. Furthermore, the present invention can be applied to a door hinge structure of a storage warehouse in which a pair of upper and lower doors is provided in one row or three or more rows in the left-right direction. The rotation center shaft 39 and adjustment shaft 40 that constitute the door hinge structure of the present invention can be constructed with blind rivets. The door hinge structure of the present invention includes a support structure that supports the closing or opening operation of the upper and lower doors 16 and 17, which is composed of a pair of cam members, and a support structure that maintains the fully closed state of the upper and lower doors 16 and 17. Alternatively, a holding structure that maintains the fully open state can be incorporated.

5 Storage body (refrigerator body)
14 Inlet/outlet (opening)
15 Inlet/outlet (opening)
16 Upper door 17 Lower door 22 Door hinge structure 23 Upper hinge 24 Lower hinge 25 Middle hinge 27 Upper hinge pin 30 Lower hinge pin 32 Support plate 33 Mounting plate 34 Middle hinge plate 35 Upper middle hinge pin 36 Lower middle hinge pin 39 Rotation center axis 40 Adjustment shaft 42 Adjustment screw 42a Screw shaft 42b Operation head 43 Fixing hole 44 Adjustment hole 47 Pin hole CA Hinge axis C1 Center axis of upper hinge pin C2 Center axis of lower hinge pin C3 Center axis of upper middle hinge pin C4 Center axis of lower middle hinge pin

Claims (4)

A door hinge structure that swingably supports upper and lower doors (16 and 17) that open and close upper and lower openings (14 and 15) formed on the front surface of the storage main body (5),
an upper hinge (23) including an upper hinge pin (27) arranged at a corner of the upper edge of the upper door (16), extending downward and pivotally supporting the upper side of the upper door (16);
a lower hinge (24) including a lower hinge pin (30) arranged at a lower edge corner of the lower door (17), extending upward and pivotally supporting the lower side of the lower door (17);
An upper middle hinge pin (35) is arranged between the lower edge corner of the upper door (16) and the upper edge corner of the lower door (17), extends upward, and pivotally supports the lower side of the upper door (16). and a lower middle hinge pin (36) that extends downward and pivotally supports the upper side of the lower door (17);
pin holes (47) formed at the upper and lower corners of the upper and lower doors (16, 17) to receive each of the hinge pins (27, 30, 35, 36) with a predetermined clearance;
Equipped with
The upper hinge pin (27) and the lower hinge pin (30) are hinges in which the central axis (C1) of the upper hinge pin (27) and the central axis (C2) of the lower hinge pin (30) are defined by a vertical axis when viewed from the front. It is arranged on the axis line (CA),
The upper middle hinge pin (35) is arranged so that its central axis (C3) is inclined toward the swinging tip of the upper door (16) in the closed position with respect to the hinge axis (CA), which is a vertical axis. ,
The lower middle hinge pin (36) is arranged so that its central axis (C4) is inclined toward the swing base end of the lower door (17) in the closed position with respect to the hinge axis (CA), which is a vertical axis. Ori,
The upper end peripheral edge of the upper middle hinge pin (35) touches the inner surface of the swinging tip side of the pin hole (47), and the lower end peripheral edge of the lower middle hinge pin (36) touches the inner surface of the swinging end side of the pin hole (47). A door hinge structure characterized by being configured so as to be in contact with an inner surface. The door hinge structure according to claim 1, further comprising an axis adjustment mechanism for adjusting the tilted postures of the upper middle hinge pin (35) and the lower middle hinge pin (36) with respect to the hinge axis (CA), which is a vertical axis. The middle hinge (25) includes a middle hinge plate (34) formed into an L-shaped cross section by horizontally long support plates (32) on the left and right, and a mounting plate (33) extending in the vertical direction, and a support plate ( 32) includes an upper middle hinge pin (35) provided on the upper surface and a lower middle hinge pin (36) provided on the lower surface of the support plate (32),
The upper middle hinge pin (35) and the lower middle hinge pin (36) are coaxially arranged in a front view,
The axis adjustment mechanism supports the left and right swing base ends of the middle hinge plate (34), and controls the rotation center axis (39) extending in the front-rear direction and the left and right swing ends of the middle hinge plate (34). The door hinge structure according to claim 2, further comprising a supporting adjustment shaft (40). A screw body having a screw shaft (42a) whose adjustment shaft (40) is screwed into the storage main body (5) via a mounting plate (33), and an operation head (42b) having a larger diameter than the screw shaft (42a). An adjustment screw (42) consisting of
A shaft adjustment mechanism is provided on the mounting plate (33), and receives the screw shaft (42a) of the adjustment shaft (40) to adjust the vertical direction of the middle hinge plate (34) about the rotation center shaft (39). The door hinge structure according to claim 3, comprising an elongated adjustment hole (44) that allows swinging.

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