JP4264838B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator. More specifically, the present invention relates to a refrigerator provided with a door closing device that is disposed in a hinge portion that pivotally supports a door and can easily and reliably close the door.

  Some conventional refrigerator door closing devices incorporate a door closing mechanism in the foam insulation of the door body. This is composed of a cam having a plurality of recesses inserted into the hinge shaft, a roller pressed against the cam by a coil spring, and the like so that the door stops when the roller is engaged with the recess groove of the cam. Is. In other words, when the roller is pressed by the compressed and biased coil spring, the outer periphery of the cam is rotated, and when it is applied to the concave groove corresponding to the door closing position, the biased spring force is suddenly released and forced. The door is closed. Since the coil spring further applies a closing force to the closed door, the door is prevented from being opened by wind pressure when other doors are closed (see, for example, Patent Document 1). .

Japanese Utility Model Publication No. 53-162951 (page 1-2, Fig. 3)

  In the refrigerator door closing device described in Patent Document 1, a roller urged by a coil spring is locked in one of the recessed grooves formed in a plurality of positions of the cam, and the opened door is stopped. In order to press the roller, a box-shaped case integrated with the coil spring in the storage portion is guided by the side wall of the storage portion and slides. There has been a problem that variations tend to occur.

In addition, if the spring force is strong, the door closes rapidly, and the closing sound becomes loud. On the other hand, if the spring force is weak, the door does not stop and stops in a state of forgetting to close. For this reason, there is a need for a means for adjusting the spring force, and a box-like case that locks the roller with a pin is required to press the roller against the cam. It becomes expensive.
Further, since this door closing device is embedded in the foam heat insulating material of the door body, the door body has to be replaced in the event of a failure.

  The present invention has been made to solve the above-described problems, and the door can be reliably closed with little variation, and the number of parts is small, the structure is simple, and it is inexpensive. It is an object of the present invention to provide a refrigerator including a door closing device that can be dealt with only by replacing the door closing device without replacing the door main body.

The refrigerator according to the present invention includes a hinge that is attached to the refrigerator body and supports the door, a cam that is formed with a concave groove at an axially symmetrical position and is non-rotatably fitted to the shaft of the hinge, A control spring that presses the cam from both sides and rotates along the outer periphery of the cam, a spring holding member that holds the control spring and rotatably supports one end of the cam, and the other end of the cam is rotatable the supporting made from the spring holding base member member is mounted, the tip portion of the control spring when mounted in the door closed to said door is positioned on a slightly inclined plane than the deepest portion of the groove of the cam A door closing device adapted to urge the door in the closing direction by the control spring, and the control spring is provided with a supplementary spring that is arranged in close contact with the outer side of the substantially Ω-shaped main spring, and the cam is It is intended to be pinched .

  The refrigerator according to the present invention has no variation and can reliably close the door without impairing the heat insulating property. Moreover, the number of parts is low, the structure is simple, and even if it breaks down. Since the door closing device that can be dealt with only by exchanging the door closing device without replacing the door main body is provided, the effect of implementation is great.

[Embodiment 1]
1 is a perspective view of a refrigerator according to Embodiment 1 of the present invention, FIG. 2 is an exploded perspective view showing the configuration of main parts such as the door closing device and lower hinge of FIG. 1, and FIG. 3 is an exploded perspective view of the door closing device. FIG. 4 is a side view showing the assembled state of the door closing device and its AA sectional view, and FIG. 5 is a top view showing the state where the door closing device is attached to the lower cap of the vegetable compartment door and its BB sectional view. FIG.

  The refrigerator main body 1 constituting the refrigerator according to the present embodiment has a front opening, a refrigeration room at the top, an ice making room and a temperature zone switching room arranged side by side, a freezing room at the left side at the bottom, and a right side. A vegetable compartment is formed in the area. 2 to 7 are doors that freely open and close the front openings of the respective chambers, 2 and 3 are left and right doors of the refrigerator compartment, 4 is an ice making door, 5 is a temperature zone switching chamber door, and 6 is a freezer compartment door. A door 7 is a vegetable room door supported by a hinge attached to the refrigerator body 1 so as to be freely opened and closed. The vegetable compartment door 7 (hereinafter referred to as the vegetable compartment door) is composed of an upper cap 71, a lower cap 72, an outer plate 73, an inner plate 74, and a heat insulating material injected and foamed into a space surrounded by these. A magnet gasket 75 is attached to the periphery on the inner plate 74 side. A groove 72a into which the outer plate 73 is inserted is provided at the edge of the lower cap 72, and at a position corresponding to the lower hinge 20 which will be described later, a heat insulating material side is recessed and a lower portion is formed. An accommodating portion 72b that is opened and accommodated by being inserted with a door closing device 30 to be described later is integrally formed.

  Reference numeral 20 denotes a lower hinge that is fixed to the lower portion of the refrigerator body 1 and supports the vegetable compartment door 7 so as to be freely opened and closed by an upper hinge (not shown). The lower hinge 20 is formed in a substantially L shape by a vertical piece 21 having a plurality of screw insertion holes 21a and fixed to the refrigerator body 1 and a horizontal piece 22 provided in a part thereof. In the piece 22, the vegetable compartment door 7 is provided with a locking step portion 23 with which a locking projection 52 of a stopper 50, which will be described later, comes into contact with the maximum opening position. A shaft 24 that pivotally supports the door 7 is erected, and in the axial direction of the shaft 24, a groove 25 is provided for fitting a cam 31 (described later) in a non-rotatable manner.

  In the door closing device 30, 31 is made of, for example, synthetic resin, and is a cylindrical cam having a large diameter portion 32a and upper and lower diameter portions 32b and 32c provided above and below the large diameter portion 32a. In addition, concave grooves 33a and 33b having both side edges formed in the inclined surface 33c are provided, and a protrusion 34 (see FIG. 4) that is engaged with the groove 25 provided in the shaft 24 of the lower hinge 20 on the inner wall. ) And is non-rotatably fitted to the shaft 24 of the lower hinge 20.

  Reference numeral 40 denotes a control spring formed by bending a leaf spring. Both ends of the control spring are bent outward and R-attached to form engaging portions 41a and 41b that engage with the concave grooves 33a and 33b of the cam 31. The main spring 41 is composed of a substantially Ω-shaped main spring 41 and a supplementary spring 42 disposed substantially in close contact with the outside of the main spring 41, and both ends of the supplementary spring 42 are engaging portions 41 a and 41 b of the main spring 41. And a size located substantially in the middle of a mounting portion 43 described later. On the opposite side of the opening 45 of the main spring 41, a mounting portion 43 having screw insertion holes 44a and 44b (44b not shown) is provided integrally with the main spring 41 and the auxiliary spring 42. .

  Reference numeral 50 denotes a spring holding member formed in a substantially S shape by a vertical piece 51a and an upper horizontal piece 51b and a lower horizontal piece 51c extending in the opposite directions above and below the vertical piece 51a. A bearing hole 52 is provided in which the upper small-diameter portion 32b is rotatably fitted and supported, and the vertical piece 51a is provided with a screw hole 53a corresponding to the mounting portion 43 screw insertion hole 44a, 44b of the control spring 40. 53b (53a not shown) is provided. Further, screw insertion holes 53c, 53d (53d is not shown) and 53e are provided on the vertical piece 51a side and the opposite side of the lower horizontal piece 51c.

Reference numeral 55 denotes a U-shaped base member having a peripheral wall 56, which is provided with a bearing hole 57 into which the lower small-diameter portion 32c of the cam 31 is rotatably fitted, and screw insertion holes 58a, 58b, 58c. A positioning protrusion 59 is provided in a protruding manner.
Reference numeral 60 denotes a stopper made of, for example, a steel plate, which is provided with a bearing hole 61 into which the lower small diameter portion 32c of the cam 31 is inserted, a positioning hole 62a that fits into the positioning protrusion 59 of the base member 55, and a screw insertion hole 62b. One side edge is bent downward, and a locking projection 63 is provided at one end of the side edge to contact the locking step 23 of the lower hinge 20 when the vegetable compartment door 7 is opened.
Reference numeral 65 denotes a bottom portion and vertical portions erected on both sides thereof, and is a substantially U-shaped reinforcing plate embedded in a heat insulating material. A screw hole 66 is provided in the bottom portion.

Next, an example of an assembly procedure of the door closing device 30 configured as described above and an installation procedure to the vegetable compartment door 7 will be described.
First, the mounting portion 43 of the control spring 40 is brought into contact with the vertical piece 51a of the spring holding member 50, and the screw 80 inserted into the screw insertion holes 44a and 44b of the mounting portion 43 is screwed into the screw holes 53a and 53b of the vertical piece 51a. And fix them together.

  Next, the concave portions 33a and 33b of the cam 31 are engaged with the engaging portions 41a and 41b of the control spring 40, and the upper small diameter portion 32a of the cam 31 is inserted into the bearing hole 52 of the upper horizontal piece 51b of the spring holding member 50. Fit. Next, the lower horizontal piece 51 c of the spring holding member 50 is fitted into the peripheral wall 56 of the base member 55, and the lower small diameter portion 32 c of the cam 31 is inserted into the bearing hole 57. Lubricating oil is applied between the cam 31 and the engaging portions 41a and 41b of the control spring 40 in order to reduce frictional resistance during sliding. Then, the screws 81 inserted into the screw insertion holes 58a and 58b of the base member 55 are screwed into the screw holes 53c and 53d provided in the lower horizontal piece 51c of the spring holding member 50, and are fixed together. Thereby, the assembly of the door closing device 30 is completed. The state at this time is shown in FIG.

  When this door closing device 30 is attached to the vegetable compartment door 7, as shown in FIG. 5, the door is opened from the lower opening to the accommodating portion 72b provided with the heat insulating material recessed in the lower cap 72 of the vegetable compartment door 7. The closing device 30 is inserted. The stopper 60 is brought into contact with the lower surface of the base member 55 so that the bearing hole 61 is fitted into the lower small diameter portion 32c of the cam 31 and the positioning hole 62a is fitted into the positioning projection 59 provided on the lower surface of the base member 55. Match. Further, the reinforcing plate 60 is brought into contact with the upper surface of the storage portion 72b.

  Then, the screw 82 inserted into the stopper 60, the base member 55, the spring holding member 50, and the screw insertion holes 61b, 58c, 53e of the storage portion 72b is screwed into the screw hole 66 provided in the bottom portion of the reinforcing plate 65, and these are inserted. Fix it together. Thereby, the attachment to the vegetable compartment door 7 of the door closing apparatus 30 is completed.

In attaching the vegetable compartment door 7 to which the door closing device 30 is attached to the opening of the vegetable compartment, the vegetable compartment door 7 is connected to the upper hinge (not shown) attached to the refrigerator body 1 at the upper edge of the vegetable compartment. The vertical piece 21 of the lower hinge 20 in which a bearing hole (not shown) provided in the upper cap 71 is inserted and the shaft 24 is inserted into the cam 31 of the door closing device 30 is inserted into the refrigerator at the lower edge of the vegetable compartment. If it fixes to the main body 1 with a screw, the vegetable compartment door 7 will be supported by the refrigerator main body 1 so that opening and closing is possible by the upper and lower hinges.
When the lower hinge 20 is attached to the refrigerator main body 1 first, the engaging portions 41a and 41b of the control spring 40 are not in a state of being engaged with the concave grooves 33a and 33b of the cam 31 as shown in FIG. The cam 31 may be rotated in advance so as to be positioned on the large-diameter portion 32a (for example, the cam 31 is rotated about 90 ° in the right direction in FIG. 4) to leave the vegetable compartment door 7 open.

Next, the operation of the door closing device 30 configured as described above will be described.
When the vegetable compartment door 7 is supported by the upper hinge and the lower hinge 20 so as to be freely opened and closed, the engaging portions 41a and 41b of the control spring 40 are recessed in the cam 31, as shown in FIG. The grooves 33a and 33b are fitted. At this time, the attachment angle of the shaft 24 erected on the horizontal piece 22 of the lower hinge 20 is such that the vegetable compartment door 7 is closed by θ ° (for example, 8 °) with respect to the front edge of the vegetable compartment, as shown by the solid line. The direction is set.

  That is, since the cam 31 is non-rotatably fitted to the shaft 24 of the lower hinge 20 fixed to the refrigerator body 1, the engaging portions 41 a and 41 b of the control spring 40 are formed in the concave grooves 33 a and 33 b of the cam 31. It does not reach the deepest part and is located on the inclined surface slightly before the deepest part. For this reason, the control spring 40 is slightly biased to press the vegetable compartment door 7 in the closing direction, and is positioned as shown by the broken line to close the opening of the vegetable compartment.

When the vegetable compartment door 7 is opened, the engaging portions 41a and 41b of the control spring 40 move while sliding along the inclined surfaces of the concave grooves 33a and 33b of the cam 31, as shown in FIG. Is gradually energized and reaches its maximum when it reaches the outer peripheral surface (large diameter portion 32a).
When the vegetable compartment door 7 is further opened, as shown in FIG. 8, the locking projection 63 of the stopper 60 attached to the lower cap 72 comes into contact with the locking step portion 23 of the lower hinge 20, and the vegetable compartment door 7 is Stop as much as possible. Even in this state, the engaging portions 41 a and 41 b of the control spring 40 are not fitted in the concave grooves 33 a and 33 b of the cam 31, in other words, the control spring 40 is located on the large diameter portion 32 a of the cam 31. However, since the engaging portions 41a and 41b are positioned symmetrically with respect to the axis, no turning force is generated, so the vegetable compartment door 7 is held in that position.

  When closing the vegetable compartment door 7 thus opened, when a force in the closing direction is applied to the vegetable compartment door 7, the engaging portions 41a and 41b are kept in a state where the control spring 40 is urged to the maximum extent. The cam 31 slides smoothly on the large diameter portion 32a. When the engaging portions 41a and 41b are applied to the inclined surfaces 33c on both side edges of the concave grooves 33a and 33b, the urging pressing force becomes a rotational force. The opening of the vegetable compartment is automatically closed and the state returns to the state shown in FIG.

By the way, in this embodiment as described above, when the vegetable compartment door 7 is rotated, the upper and lower end surface edge portions of the engaging portions 41a and 41b of the control spring 40 come into contact with the large-diameter portion 32a of the cam 31, and the large It is conceivable that the diametrical portion 32a is damaged or worn, and a twisting sound or the like is generated when the vegetable compartment door 7 is opened or closed.
In order to avoid the occurrence of such a problem, if the upper and lower end face edge portions of the engaging portions 41a and 41b of the control spring 40 are slackened by barrel processing or surface hammering, the large diameter portion 32a of the cam 31 is obtained. Damage and wear can be prevented.

According to the door closing device 30 of the present invention, the door in which the door closing device 30 is incorporated automatically opens the opening when reaching a predetermined opening position even if the force applied to the door from the opened state is weak. It is possible to close the door without fail, and it is possible to close it securely without stopping.
Further, since the spring is biased by directly clamping the cam 31 by the control spring 40, there is no variation in the pressing force (biasing force) due to variations during assembly, and a predetermined spring force is directly converted into a door closing force. be able to.

In order to increase the closing force of the door, that is, to increase the urging force of the control spring 40, the concave grooves 33a and 33b of the cam 31 are deepened to increase the drop or the height of the control spring. It is conceivable to increase the plate thickness or increase the plate thickness. However, in this case, not only a large space is required for incorporation into the door, but also the workability deteriorates.
In the present invention, the auxiliary spring 42 is superposed on the outer side of the main spring 41 to reinforce the base of the control spring 40 so that a sufficient urging force can be obtained even if the plate thickness is thin. Since the cam 31 is directly clamped by the portions 41a and 41b, a small and durable control spring 35 can be obtained, and the housing portion 72b provided on the door cap without impairing the heat insulation of the refrigerator. Can be accommodated. In addition, in the case of a light door with a small door and a load of contained items, only one main spring 41 may be used.

Furthermore, since the cam 31 directly biases the control spring 40, the number of parts is small, the operation is smooth, and an inexpensive door closing device 30 can be obtained.
In the door closing device 30 according to the present invention, the locking portions 41a and 41b of the control spring 40 are not engaged with the concave grooves 33a and 33b of the cam 31 even when the door reaches the maximum open position. Since the maximum opening position is regulated by the locking step 23 provided on the lower hinge 20 and the locking projection 63 provided on the stopper 60, the door is closed even when the door is opened to the maximum angle. Does not require great power.

Moreover, since this door closing device 30 is accommodated in the accommodating part 72b provided in the cap of the door, since it can be integrated before and after foaming a heat insulating material, workability is good.
Furthermore, since the door closing device 30 is shielded from the foam heat insulating material by the cap, only the door closing device 30 can be easily replaced without replacing the door even if it breaks down. Therefore, the refrigerator has excellent serviceability. Can be obtained.

  Further, the door closing device 30 holds the upper and lower small diameter portions 32b and 32c of the cam 31 by being rotatably fitted in the bearing holes 52 and 57 of the spring holding member 50 and the base member 55. Alternatively, even if the cam 31 is rotated before being assembled into the cap, the cam 31 is not detached by the pressing force of the control spring 40. For this reason, it is not necessary to apply the lubricating oil to the cam 31 or the control spring 40 in advance in order to reduce wear between the two, and the lubricating oil is applied by rotating the cam 31 after assembling. Therefore, it is possible to work without soiling hands and parts during assembly.

[Embodiment 2]
9 is a side view of a refrigerator door closing device according to Embodiment 2 of the present invention, FIG. 10 is an exploded perspective view of FIG. 9, and FIG. 11 is an enlarged perspective view of the cam of FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the present embodiment, the vertical height (length) h ₁ of the large diameter portion 32 a of the cam 31 is formed lower (shorter) than the vertical height h of the control spring 40, and the upper and lower small diameter portions are formed. 32b and 32c are provided with flange-like stopper portions 35a and 35b having substantially the same outer diameter as the large-diameter portion 32a at a predetermined distance from the large-diameter portion 32a. In the following description, the space between the large diameter portion 32a and the stopper portions 35a and 35b is referred to as escape portions 36a and 36b.
When the door closing device 30 is assembled, the stopper portions 35a and 35b are such that the upper surface of the upper stopper portion 35a abuts the lower surface of the upper horizontal piece 51b of the holding member 50 and the lower surface of the lower stopper portion 35b is the base. The member 55 is provided at a position in contact with the outer periphery of the upper surface of the bearing hole 57 of the member 55.

  The assembly procedure of the door closing device 30 according to the present embodiment is substantially the same as that of the first embodiment. However, as shown in FIG. The lower stopper portion 35b contacts the lower surface of the piece 51b and is positioned in contact with the outer periphery of the upper surface of the bearing hole 57 of the base member 55, and the upper and lower end surface edges of the engaging portions 41a and 41b of the control spring 40 The portions 46c and 46d are located in the relief portions 36a and 36b of the cam 31.

  According to the present embodiment configured as described above, the cam 31 that is non-rotatably supported by the shaft 24 of the lower hinge 20 that is fixed to the refrigerator body 1 is fixed to the vegetable compartment door 7 and is rotatable. Since the base member 55 and the holding member 50 installed in the above are held by the stopper portions 35a and 35b of the cam 31, they do not move up and down even when the vegetable compartment door 7 is rotated, and the control spring Since the upper and lower end face edge portions 46a and 46b of the 40 engaging portions 41a and 41b are located at the escape portions 36a and 36b of the cam 31, they do not contact the large diameter portion 32a of the cam 31.

  For this reason, when the vegetable compartment door 7 is rotated, the upper and lower end face edge portions 46a, 46b of the engaging portions 41a, 41b of the control spring 40 do not come into contact with the large diameter portion 32a of the cam 31. 41a and 41b can rotate smoothly along the large diameter part 32a. Moreover, since the large diameter part 32a of the cam 31 is not damaged or worn out by this, the lifetime of the door closing device 30 can be extended.

In the above description, a case is shown in which the heat insulating material side is recessed in the lower cap 72 of the vegetable compartment door 7 to provide the accommodating portion 72b, and the door closing device 30 is accommodated in the accommodating portion 72b. The cap 71 may also be provided with the door closing device 30.
Moreover, although the case where the door closing device 30 was provided in the vegetable compartment door 7 was shown, you may provide the door closing device 30 also in another door. In this case, if the door closing device 30 is incorporated in the upper and lower caps. It can cope with larger doors and heavy doors with large loads.
Furthermore, although the case where the door closing device 30 according to the present invention is incorporated in the illustrated refrigerator door is shown, the present invention can also be implemented in refrigerator doors having other structures.

It is a perspective view of the refrigerator which concerns on Embodiment 1 of this invention. It is a perspective view which decomposes | disassembles and shows the door closing apparatus, lower hinge, etc. of FIG. FIG. 3 is an exploded perspective view of the door closing device of FIG. 2. It is the side view which shows the state which assembled the door closing apparatus, and its AA sectional drawing. It is the top view which shows the state which attached the door closing apparatus to the lower cap of the vegetable compartment door, and its BB sectional drawing. It is operation | movement explanatory drawing of a door closing apparatus. It is operation | movement explanatory drawing of a door closing apparatus. It is operation | movement explanatory drawing of a door closing apparatus. It is a side view of the door closing device of the refrigerator which concerns on Embodiment 2 of this invention. FIG. 10 is an exploded perspective view of FIG. 9. It is an expansion perspective view of the cam of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerator main body, 7 Vegetable room door, 20 Lower hinge, 30 Door closing device, 31 Cam, 33a, 33b Groove, 35a, 35b Stopper part, 36a, 36b Escape part, 40 Control spring, 41 Main spring, 41a, 41b Engagement part, 42 supplementary spring, 46a, 46b end face edge part, 50 spring holding member, 55 base member, 60 stopper.

Claims (12)

A hinge attached to the refrigerator body and supporting the door;
A cam in which a concave groove is formed at a symmetrical position in the axial direction and fitted to the hinge shaft in a non-rotatable manner; a control spring in which a tip portion presses the cam from both sides and rotates along the outer periphery of the cam; A spring holding member that holds a control spring and rotatably supports one end of the cam, and a base member to which the other end of the cam is rotatably supported and to which the spring holding member is attached, are attached to the door. so as to bias the door in the closed direction by the control spring tip of the control spring is located on a slightly sloping surface than the deepest portion of the groove of the cam when the door closing Te was a door closing device Prepared ,
The refrigerator is characterized in that the control spring is arranged such that a supplementary spring is disposed in close contact with the outer side of a substantially Ω-shaped main spring so as to sandwich the cam . A hinge attached to the refrigerator body and supporting the door;
A cam that is formed with a concave groove at a symmetrical position in the axial direction and is non-rotatably fitted to the shaft of the hinge, and a supplementary spring is disposed in close contact with the outer side of the substantially Ω-shaped main spring. A control spring that presses the cam from both sides and rotates along the outer periphery of the cam, and is formed in a substantially S-shape by a vertical piece and an upper horizontal piece and a lower horizontal piece that extend vertically opposite to each other. A spring holding member that holds the control spring by the vertical piece, and rotatably supports one end of the cam by the upper horizontal piece , and a spring holding member that rotatably supports the other end of the cam. The lower horizontal piece is attached to the door, and is attached to the door. When the door is closed, the front end of the control spring is located in the concave groove of the cam and the control spring biases the door in the closing direction. A refrigerator comprising: a door closing device adapted to do so. A hinge attached to the refrigerator body and supporting the door;
A cam that is formed with a concave groove at a symmetrical position in the axial direction and is non-rotatably fitted to the shaft of the hinge, and a supplementary spring is disposed in close contact with the outer side of the substantially Ω-shaped main spring. A control spring that presses the cam from both sides and rotates along the outer periphery of the cam, and is formed in a substantially S-shape by a vertical piece and an upper horizontal piece and a lower horizontal piece that extend vertically opposite to each other. A spring holding member that holds the control spring by the vertical piece, and rotatably supports one end of the cam by the upper horizontal piece , and a spring holding member that rotatably supports the other end of the cam. the consists base member under the horizontal plate is attached to, located on a slightly sloping surface than the deepest portion of the distal end of the control spring when mounted in the door closing the door in the groove of the cam the control And a door closing device that urges the door in the closing direction by a spring. Refrigerator and wherein the door. A hinge attached to the refrigerator body and supporting the door;
A cam in which a concave groove is formed at a symmetrical position in the axial direction and fitted to the hinge shaft in a non-rotatable manner; a control spring in which a tip portion presses the cam from both sides and rotates along the outer periphery of the cam; A spring holding member that holds a control spring and rotatably supports one end of the cam, and a base member to which the other end of the cam is rotatably supported and to which the spring holding member is attached, are attached to the door. a door closure device tip of the control spring when the door closure was made to bias the door in the closed direction by the control spring is located on the slightly inclined surface from the deepest portion of the groove of the cam Te A refrigerator characterized by comprising. A door of a room supported by a hinge attached to the refrigerator body so as to be freely opened and closed ;
A cam in which a concave groove is formed at a symmetrical position in the axial direction and fitted to the hinge shaft in a non-rotatable manner; a control spring in which a tip portion presses the cam from both sides and rotates along the outer periphery of the cam; A spring holding member that holds a control spring and rotatably supports one end of the cam, and a base member to which the other end of the cam is rotatably supported and to which the spring holding member is attached, are attached to the door. When the door is closed, the front end of the control spring is positioned in the groove of the cam, and the control spring presses the door in the closing direction by a predetermined angle θ with respect to the front edge of the chamber to open the chamber. And a door closing device for closing the door with the door. The door closing device, according to any one of claims 1-5, characterized in that accommodated on the cap or bottom cap or top and bottom of the housing portion of the heat insulating material side is formed by recessed cap constituting the door refrigerator. The refrigerator according to any one of claims 1 to 6, wherein the door closing device is fixed to the door via a stopper that contacts a part of the hinge and restricts the maximum opening position of the door. The door closure device, both except when the door closure according to claim 1-7, characterized in that the distal end portion of said control spring so as not to engage the groove of the cam, to regulate the maximum opening position of the door The refrigerator according to crab. The cam of the door closing device is constituted by a cylindrical large-diameter portion, small-diameter portions provided above and below it, and a concave groove provided at a symmetrical position in the axial direction . The refrigerator in any one. 10. The refrigerator according to claim 9 , wherein the vertical height of the large-diameter portion of the cam is shorter than the vertical height of the control spring. The small diameter portion of the cam includes a stopper portion that is provided between the upper and lower end portions of the large diameter portion via relief portions and holds the spring holding member and the base member, respectively. The refrigerator according to claim 10 . The refrigerator according to any one of claims 1 to 11, wherein upper and lower end surface edge portions of the engaging portion of the control spring are slackened by barrel processing or surface hammering.

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