JP2002147939A - Door opening and closing mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems that, since a door moves by a prescribed distance toward a door opened side when one door is opened, an opening resistance due to a friction is apt to be generated in the door and a main body side in contact with the door such as a part for supporting the door upon movement of the door so that a load when the door is opened is larger than that of an ordinary hinged door, and that the opening direction of the door is seriously different from the moving direction of the door so that the door is hardly assuredly moved and the door opening movement is uneven. SOLUTION: The door 2 for opening and closing the opening part is provided so as to be engaged with and disengaged from the periphery of the opening part. The door 2 is separated by a prescribed space from the periphery of the opening part by a lever means. The lever means has a resilient function for the separating movement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door opening / closing mechanism for a refrigerator or the like.

[0002]

2. Description of the Related Art A conventional door opening / closing mechanism of this type is provided with a cam mechanism for engaging and disengaging a door and a main body with respect to a left side and a right side of the door, as shown in, for example, Japanese Patent Application Laid-Open No. 9-303942. These cam mechanisms can take a first locking position that is symmetrical on the left and right sides of the door and a second locking position that is symmetrical on the left and right sides of the door. When the door is taken to the first locking position and one of the right and left doors is opened, the door slides and the other cam mechanism moves to the second
There is one in which a locking position is set and the second locking position is rotatably locked.

[0003]

In the above-described door opening / closing mechanism, when one of the doors is opened, the door moves to a door opening side by a predetermined distance, so that when the door is moved, the door and the door are supported. Open resistance is likely to occur due to friction with the main body side where parts contact, etc.There is a problem that the load when opening the door is larger than that of a normal hinged door, and the door opening direction and the door moving direction are large. On the contrary, there is a problem that the door is not easily moved and the opening operation is uneven.

In order to solve the above-mentioned problem, a lever-type means is provided on both sides of a door to form a door opening / closing mechanism. Pulling the handle toward you may damage or deform the action part or the action target part by the handle,
There is a problem that hinders the subsequent door opening operation, when the handles on both sides are simultaneously pulled toward the front with an abnormal force, when the handles on both sides are simultaneously pulled toward the front with an abnormal force, in some cases, There has been a problem that the door may fall off from the main body due to deformation or breakage of the operation target portion or the like.

[0005]

SUMMARY OF THE INVENTION A door opening and closing mechanism according to the present invention solves the above-mentioned problems. A door opening and closing mechanism according to the present invention is a door that opens and closes the opening by coming into contact with and separating the periphery of the opening. The door is separated from the periphery of the opening by a predetermined distance by leverage means, and the leverage means is provided with an elastic function for the separating operation.

The door opening / closing mechanism of the present invention further comprises a door which opens and closes the opening by coming into contact with the periphery of the opening and opening and closing the opening by a lever type means. The lever-operating point and leverage point of the lever-type means are connected by a connecting member, and at least a part of the lever-type means has an elastic function for the separating operation. is there.

The door opening and closing mechanism according to the present invention is characterized in that the connecting member comprises a shaft, and the shaft comprises an elastic body.

Further, in the door opening and closing mechanism according to the present invention, the lever-type means, which is the point of leverage, comprises an arm portion,
At least the action point side of the arm portion has an elastic function.

Further, the door opening / closing mechanism of the present invention is characterized in that at least a part of the operation target portion of the lever type means has an elastic function.

Further, in the door opening and closing mechanism according to the present invention, the door is provided with a cam mechanism for engaging and disengaging the door with the main body on both sides of the door, and the cam mechanism is symmetrical on both sides of the door. A lock position and a second lock position can be set, and the cam mechanisms on both sides take the first lock position in the closed state of the door, and when one of the two sides of the door is opened, the door moves to the door open side. It is characterized in that the lever is moved by a predetermined distance to take a second locking position, is rotatably locked in the second locking position, and is provided with the lever-type means for separating a predetermined distance on at least one of both sides of the door. It is assumed that.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a door opening / closing mechanism according to the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a refrigerator provided with a door opening / closing mechanism of the present invention, FIG. 2 is an enlarged view of the vicinity of a handle by the lever-type means of FIG. 1, and FIG. 3 is a view of the handle support and handle base of FIG. FIG. 4 is a sectional view taken along the line AA of FIG. 1, FIG. 5 is a sectional view taken along the line BB of FIG. 1, and FIG. 6 shows a hinge angle on the lower side of the door in the door opening / closing mechanism of the present invention. FIG. 7
FIG. 8 is a view showing a lock cam above the door in the door opening / closing mechanism of the present invention, FIG. 8 is a view showing a slide cam above the door in the door opening / closing mechanism of the present invention, and FIG. 9 is a slide of the door opening / closing mechanism of the present invention. FIG. 10 is a partially enlarged view showing a part of the lower side of the door and its related parts near the cam, and FIG.
FIG. 11 is a view showing the operation of the door opening / closing mechanism of the present invention, and FIG. 12 is a view showing another embodiment, corresponding to a sectional view taken along line BB of FIG.

In FIG. 1, 1 is a refrigerator body, 2 is a refrigerator door, 3 is a vegetable door, 4 is a freezer door, 5 is a freezer door,
The refrigerator main body 1 has an isolation room having an opening at the front corresponding to each of the doors. The refrigerator compartment door 2
Is a double door, which has lever-type handles 6 and 7 on the right and left respectively.

The upper and lower door caps 9 and 10 are respectively inserted into the upper and lower ends of a door plate 8 whose right and left ends are bent rearward to form a box 11, and the handles 6, 7 are attached to the refrigerator compartment door 2. The opening 8a, 8b is provided in a portion where the door plate 8 is cut out. The openings 8a, 8b are respectively provided with handle supports 12, 13 from behind, and the handle supports 12, 13 are provided with the openings 8a, 8 respectively.
The handle bases 14 and 15 are respectively attached so that b can be inserted from the left and right side surfaces obliquely forward and inserted.

The handle bases 14 and 15 are located outside the handle supports 12 and 13 and are mounted with screws from inside the door with the door plate 8 interposed therebetween. Then, in a place where a gap is formed in the mounting portion of each part, a sealing process (not shown) is applied to a portion on the inner side of the refrigerator compartment door 2 with a sealing material (not shown), and a refrigerator compartment door small assembly 16 is obtained. Also, in the drawing, the handle supports 12, 13 are shown.
Is not visible from the outside, so its outline is not drawn,
Leader lines are drawn by dotted lines to show their approximate positions.

The refrigerating compartment door subassembly 16 is placed in a foaming jig, and a urethane foam material is injected from a rear opening (not shown) of the refrigerating compartment door subassembly 16 so as to cover the rear opening. A rear plate (not shown) is attached to the refrigerator compartment door subassembly 16 and the lid of the foaming jig is closed, urethane foaming is performed, and after foaming is completed, the foaming jig is taken out of the foaming jig and foamed inside. The assembly 17 in the refrigerator compartment door with heat insulating material is completed. The vegetable compartment door 3 and the freezer compartment doors 4 and 5 are drawer-type doors, respectively, and can be pulled out in the front-rear direction.

In FIG. 2, this drawing is a view near the handle 7 on the right side of the door, and is partially a sectional view so that the internal structure can be seen. In addition, the vicinity of the handle 6 on the left side of the door is obtained by reversing the drawing in the left-right direction. Below the handle base 15 in front of the handle support 13, a keyhole-shaped hole 15b in which a substantially rectangular cut having a width smaller than the diameter of the substantially circular portion 15a continues from the substantially circular portion 15a.
Is provided.

The handle support 13 is provided with a substantially oval-shaped hollow portion 13a connected to the hole 15b. The hollow portion 13a extends to the lower portion 10 of the door cap. There is a hole 10a, the hole 15b, the cavity 13a, and the substantially oval hole 10a.
Are spaces 18 communicating with each other.

When the hollow urethane foam is injected into the box 11 and foamed, the fitting portion between the hollow portion 13a and the substantially oval hole 10a in the lower portion 10 of the door cap moves from the fitting portion to the space 18 inside. In this case, a sealing process is performed on the portion in some cases so that urethane does not leak.

The lower shaft 19 is inserted into an opening of the lower handle 20, and an L-shaped bent portion 19 a above the lower shaft 19 is held by a holding portion 20 a of the lower handle 20. Then, the assembly in which the lower shaft 19 and the lower handle 20 are integrated is the handle base 15
A substantially circular boss 20b inserted into the substantially circular portion 15a of the hole 15b and protruding below the lower handle 20 fits into the substantially circular portion 15a of the hole 15b of the handle base 15, and the lower handle 20 is a lower shaft. Along with 19, it is rotatably attached to the handle base 15.

A lower shaft 19 is inserted into the space 18, and an L-shaped bent portion 19 below the lower shaft 19 is provided.
b protrudes from the surface inside the lower part 10 of the door cap. Therefore, the space 18 has a shape through which the L-shaped bent portion 19b passes. On the L-shaped bent portion 19b below the lower shaft 19, a cam lever 21 serving as an arm from below is provided with a slide cam 2 serving as a slide cam portion.
2 and attached.

Further, since the lower shaft 19 is provided with the L-shaped bent portions 19a and 19b, a key and a key groove for preventing rotation are provided for coupling the lower shaft 19 with the lower handle 20 and the cam lever 21. , The structure of the door handle is simplified, the number of parts is small, and assembly is easy.

By providing the space 18, even if the door has a foamed heat insulating material inside, the L
The bent part 19b can protrude integrally with the lower shaft 19 to the surface inside the lower door cap 10, which also simplifies the structure of the door handle, reduces the number of parts, and facilitates assembly. . It is clear that the same effect can be obtained even with the above-mentioned single-door structure.

Further, the cam lever 21 is provided with the L-shaped bent portion 1.
9b, a circular boss 2 is provided on the lower surface of the cam lever 21 around a line extending downward from the center 19c of the rotation shaft serving as a fulcrum of the lever of the lower shaft 19.
1a is provided. The circular boss 21a is rotatably fitted in the hole 22a of the slide cam 22. The slide cam 22 is screwed to the reinforcing plate 23 with the lower portion of the door cap 10 interposed therebetween.

Then, the handle 7 is inserted from the outside of the door (right side in the figure) of the lower handle 20 rotatably attached to the handle base 15, and the handle 7 is attached to the lower handle 20 by nail engagement. Can be The handle 7 and the lower handle 20 may be fixed with screws.

The rotation shaft center 1 of the lower shaft 19
A through-hole 7a above the handle 7 and a through-hole 15c of the handle base 15 facing the through-hole 7a, provided centered on an extension line above 9c, and
A substantially circular hole 1 provided in a projection of the handle base 15
The upper shaft 24 is inserted into 5d from below, and the handle 7 is rotatably attached to the handle base 15.

By rotating the upper shaft 24,
An L-shaped bent portion 24a provided below the upper shaft 24 is hooked on the projection 15e of the handle base 15 to prevent the upper shaft 24 from coming off.

The rotation shaft center 1 of the lower shaft 19
A spring 25 is attached to a circular boss 7b on the lower upper surface of the handle 7 provided near the top of the extension 9c.
Is fitted so as to push the handle base 15 rearward, and the other end 25b of the spring at the other end is applied to the engaging portion 7c on the lower upper surface of the handle 7 so as to push forward. Therefore, after the refrigerator compartment door 2 is opened by pulling the grip 7d of the handle 7 toward the front and opening the refrigerator compartment door 2, when the hand is released from the grip 7d, the handle 7 returns to the original position by the reaction force of the spring 25. Has become.

Then, a base cover 26 is attached to the handle base 15 by claws so as to cover the L-shaped bent portion 24a, the projection 15e, the circular boss 7b, the engaging portion 7c, and the spring 25 of the upper shaft 24, In addition, a handle cover 27 is attached to the front surface of the handle 7 by fitting a claw.

When the base cover 26 is attached to the handle base 15, the L-shaped bent portion 24a is surrounded by the back surface of the base cover 26, the projection 15e, and the surface of the handle base 15. Even if the L-shaped bent portion 24a applied to the protrusion 15e of the handle base 15 rotates, the L-shaped bent portion 24a is disengaged from the protrusion 15e, and the upper shaft 24 is connected to the through hole 7a.
a, 15c and the substantially circular hole 15d do not fall off.

If a wall surface extending upward is provided at the front end of the projection 15e with a space above the L-shaped bent portion 24a to allow the L-shaped bent portion 24a to pass therethrough, a temporary stopper is prevented before the base cover 26 is attached. It plays a role and further improves the assembly workability. Further, after all the parts related to the handle are assembled in the refrigerator compartment door 2, a heat insulating material for the door may be provided by urethane foam.

It is apparent that the same effects can be obtained even with the above-mentioned single-door structure.

FIG. 3A is a view of the handle support 13 on the right side of the door as viewed from below, and the hollow portion 13a is a substantially oval hole. (B) is a view of the handle base 15 on the right side of the door as viewed from below, and shows a keyhole-shaped hole 1.
5b has a substantially circular portion 15a. When the shapes of the handle support 13 and the handle base 15 are reversed in the left-right direction, the handle support 12 on the left side of the door is provided.
And the shape of the handle base 14.

The hollow portion 13a and the hole 15b are formed so that the L-shaped bent portion 19b of the lower shaft 19 passes therethrough. The substantially circular portion 15a of the keyhole-shaped hole 15b is provided with the handle lower portion 20a. The substantially circular boss 20b is rotatably fitted. The circular center of the substantially circular portion 15a coincides with the rotation shaft center 19c of the lower shaft 19.

FIG. 4 is a sectional view taken along the line AA of the vicinity of the handle 7 when the door on the right side of the refrigerator compartment door 2 in FIG. 1 is closed. FIG.
This drawing is the one that is inverted in the left-right direction.

A rear plate 28 is attached to the rear bent portion 8c of the door plate 8. A groove 28a is provided in a peripheral portion of the back plate 28, and a mounting portion 29a of the packing 29 is inserted into the groove 28a to
8 attached. An elastic magnetic body 29b is provided inside the packing 29, and when the door is closed, the packing 29 adheres to the front surface 31 of the main body opening portion such as the color steel cabinet 30 of the refrigerator main body 1 so that the outside air is closed. And is insulated. Reference numeral 2a denotes a heat insulating material of urethane foam which is integrally foamed by the refrigerator compartment door 2.

When the right side of the door is opened from the door closed state, the grip 7d of the handle 7 is gripped and pulled forward, and the handle 7 rotates clockwise about the rotation axis center 19c. The lower L-shaped bent portion 19a of the lower shaft 19 held by the lower handle 20 and the lower holding portion 20a of the lower handle 20 shown in FIG. Rotate.

Further, the cam lever 21 shown in FIG. 2 also rotates clockwise about the rotation shaft center 19c by the clockwise rotation of the lower shaft 19, and the front face 3 of the main body opening 3 is rotated.
The right side of the refrigerating compartment door 2 is separated from the front surface 31 of the opening of the main body by a predetermined distance until the contact portion 7e of the handle 7 hits the contact receiving portion 15c of the handle base 15 by pushing a lock-out cam 32 which will be described later. Is done.

At this time, the packing 29, mainly in the right direction, of the door that is in close contact with the magnetic force of the magnetic body 29b is slightly separated from the front surface 31 of the main body opening, so that it is easy to move in the left-right direction, and the door rotates. It also becomes easy to move to a second locking position, which will be freely locked, which will be described later. The packing 29
Is slightly away from the front face 31 of the main body opening, the outside air easily enters the storage, and the subsequent door opening requires less force than opening the door at the predetermined interval.

After that, when the handle 7 is further pulled forward, the right side of the refrigerator compartment door 2 is further opened while the contact portion 7e of the handle 7 remains in contact with the contact receiving portion 15c.

When the grip 7d is released from the hand, the spring 2 fitted to the circular boss 7b on the lower upper surface of the handle 7 is released.
With the reaction force of 5, the handle 7 returns to the original positional relationship (the positional relationship shown in this figure) with respect to the handle base 15. For this purpose, one end 25a of the spring 25 is connected to the handle base 1
The other end 25b is pushed so as to push the engaging portion 7c on the lower upper surface of the handle 7 forward so as to push the back 5.

The handle 7 is a handle base 1
When returning to the original positional relationship with respect to the handle 5, the handle 7
Hits the steering wheel base 15 and a hitting sound is generated,
In order to soften the impact sound, it is preferable to provide a cushion 7f on at least one of the handle 7 and the handle base 15.

The vicinity of one end 25a of the spring 25 on the handle base 15 side is bent forward like a warp, and the spring 25 is fitted on the circular boss 7b. The handle 7 can be inserted from below the handle 20 from the right side of the door without being caught. In addition, the base cover 26 is attached to the handle base 15 by nail fitting.

The heat insulating material 2a of the refrigerator compartment door 2 has a low heat insulating property, and the handle support 13 and the handle base 15
When dew condensation occurs on the surface of the handle support 13, a heat conductive material (for example, aluminum foil) is applied from the heat insulating material 2a side (inside) to the heat insulating material 2a side of the handle support 13 at the door plate 8 near the handle support 13 in front of the door. It may be used as a measure to prevent sticking and condensation.

[0045] Therefore, the vicinity of the rising portion from the vicinity of the door plate 8 at the front of the handle support 13 and the handle base 15 becomes substantially vertical or leftward with respect to the vicinity of the door plate 8 so as to be located forward. If the surface is left, it becomes easier to attach the heat conductive material.

In FIG. 5, this drawing shows B near the lower part 10 of the door cap in the closed state of the right side of the refrigerator compartment door 2 in FIG.
A cross-sectional view taken along line -B mainly shows the vicinity of the cam lever 21. The equivalent cross-sectional view near the lower left side door cap 10 is obtained by inverting this drawing in the left-right direction.

A cam lever 21 incorporated in a slide cam 22 from below is attached to the lower L-shaped bent portion 19b of the lower shaft 19 so as to surround it. Further, a circular boss 21a (see FIG. 2) provided below the cam lever 21 provided on the extension of the rotation shaft center 19c.
) Is rotatably fitted in a hole 22a (see FIG. 2) of the slide cam 22.

When the grip 7d of the handle 7 on the right side of the door shown in FIG. 4 is gripped and pulled forward, the lower shaft 19 rotates clockwise as viewed from above, about the rotation axis center 19c. Therefore, the cam lever 21 also rotates clockwise about the rotation shaft center 19c similarly to the lower shaft 19, and the cam lever 21 is in contact with the outer lock cam 32, which is the point of leverage of the cam lever 21, in front of the outer lock cam 32. And the contact portion 7e of the handle 7 shown in FIG.
The right side of the refrigerator compartment door 2 is separated from the main body opening front surface 31 by a predetermined distance and opened until it hits the hit receiving portion 15c.

The pushing surface 21b of the cam lever 21, which pushes the front of the unlocked cam 32, is
2 is pushed forward toward the center of the refrigerator compartment door 2, so that the front of the lock-out outer cam 32 is obliquely rightward (side of the door). As a reaction force, a force acts to move the right side of the refrigerator compartment door 2 rightward (to the side of the door) forward.

The opening of the door at a predetermined interval from the front face 31 of the main body opening with the outer cam 32, the cam lever 21, the lower shaft 19, and the handle 7 in FIG. 4 is based on the principle of leverage. Even if the handle 7 is pulled toward the user, the direction in which the force applied to the outer lock cam 32 is applied can be changed to a free direction to some extent, and it is possible to apply a force in the same direction as the door moving direction. The open resistance can be reduced.

This is because the outside lock cam 32
Similar effects can be obtained not only when applying a force but also when applying a force to other portions of the refrigerator main body 1.

Further, the pressing surface 21 of the cam lever 21
b from the portion in contact with the outer cam 32
Since the distance to 9c is shorter than the distance from the rotation axis center 19c in FIG. 4 to the center of the grip 7d of the handle 7, the force applied to the grip 7d is reduced to the respective length by the principle of leverage. The value becomes inversely proportional, and the outer lock cam 32 is pushed with a force stronger than the force applied to the grip 7d, so that the door opening force can be reduced.

Further, since the position of the cam lever 21 serving as the arm of the leverage point is below the refrigerator compartment door 2,
The cam lever 21 of the arm portion is determined by the weight of the refrigerator compartment door 2.
The position of the arm part and the position of the other side (for example, the cam 32 outside the lock) are stably held in the up and down direction, and the moving operation force by the lever is securely released. A door opening / closing mechanism that can be transmitted to the part and performs a more stable opening operation can be obtained.

The lower shaft 19 is made of an elastic material (for example, a spring material such as a hard steel wire (SWRH) or stainless steel).
If an elastic function is provided by being formed of an elastic resin material such as polyacetal or the like or a combination thereof, the handle 7 in FIG. Even if the handle 7 is pressed down and the handle 7 is pulled forward to apply an impact load or an unreasonable load as described above to the handle 7, the pressing surface 21 of the cam lever 21
b hits the outer lock cam 32, the lower shaft 19
Torsion occurs temporarily in the rotation direction of, and an unreasonable load such as the impact load can be relieved at the acting portion, and the deformation of the pressing surface 21b, the contact portion of the lock outer cam 32, and other places where the load is applied. And breakage can be prevented.

Further, in the cam lever 21 of the arm portion including the point of action of the lever, the portion of the pressing surface 21b is made of an elastic material (for example, a spring material such as hard steel or stainless steel, an elastic material containing rubber or resin material, or the like). Or a combination thereof) to provide an elastic function, the portion of the pressing surface 21b is temporarily deformed, so that an unreasonable load such as an impact load can be relieved in the action portion as described above. It is possible to prevent deformation and breakage of a portion to which a load is applied in the same manner as described above.

In this drawing, the portion including the pressing surface 21b is formed of a stainless spring material, and shows a state where it is attached to the cam lever 21. Further, the same effect as described above can be obtained even if the entire cam lever 21 is formed of the elastic body as described above.

Further, the above is not limited to the structure shown in the drawing, and the operating portion of the structure including the operating point of the lever of the lever type means (for example: a handle having a fulcrum, which is opposed to the force point and the fulcrum) At least a part of the handle portion between the end of the handle at the point of action that applies the door opening force and the fulcrum on the side of the handle, etc.), the same effect can be obtained.

Further, the outer lock cam 32 is made of a structure including an elastic body as described above, and a portion of the outer lock cam 32 to be acted on by the lever-type means, which is in contact with the pushing surface 21b, and the periphery thereof, When the function is provided, also in the same manner as described above, an unreasonable load such as an impact load can be relieved in the action portion, and the deformation or breakage of the portion where the load is applied can be prevented in the same manner as described above.

It should be noted that, in this figure, the out-of-lock cam 32
An outer lock core portion 32a to be a rear core portion is formed (for example, press-formed with a stainless steel for deep drawing), and the outer lock buffer portion 3 is provided in front of the outer lock cam 32.
2b is formed (for example, formed of a stainless spring plate material in accordance with the outer shape of the guide surface of the lock-out cam 32 and welded to the lock-out cam core material portion 32a). I have it.

The above is not limited to the structure shown in FIG.
The lever-operating portion of the lever-type means (for example: the handle end having the fulcrum, the end of the handle opposite to the point of force and the fulcrum sandwiched between the fulcrum and the main body opening front surface 3 which applies the door opening force)
At least a part of the contact portion of the outer box such as 1 has an elastic function (for example: the contact portion is formed of a leaf spring, and is attached to the outer box in a shape relationship such that the leaf spring bends.) A compression spring is placed inside the cylinder, a rod is provided in the cylinder on the contact portion side so as to be movable back and forth, and the compression spring has a cushioning function, and the cylinder is attached to the outer box. Deformation and breakage of a part can be prevented.

It is to be noted that a lever-type means for assisting the opening operation is provided on the drawer-type door, and an action portion of the lever-type means (for example: an end of the handle or an end for connecting to the end of the handle to push the action target portion). The same effect as described above can be obtained even when the same elastic function as described above is provided to the push plate or the like or the action target portion (for example: the contact portion of the outer box or the like).

Each of the above-mentioned effects can be obtained independently and individually. In some cases, even if each of the above-mentioned elastic functions is appropriately combined to adjust and provide each function,
Similar effects can be obtained.

The temporary deformation and torsion return to their original shapes and the like, except for the unreasonable load such as the impact load, and in normal use, the temporary deformation and torsion do not change. It is set so as not to affect each operation.

FIGS. 6A to 6D are views showing the right side from the center of the hinge angle 33 which is attached to the main body opening front surface 31 of the refrigerator main body 1 below the refrigerator compartment door 2 with screws or the like. FIG. 6A is a plan view showing one side of the hinge angle 33. FIG. Note that the left side from the center of the hinge angle 33 has a shape obtained by inverting FIG. 6A in the left-right direction. 6 (b) to 6 (d) respectively show FIG.
It is the sectional view on the AA line, the sectional view on the BB line, and the sectional view on the CC line of (a).

Further, since the weight of the door and the like are added below the refrigerator compartment door 2, the outer lock cam 32 is made of a metal (for example, a stainless steel plate) and the like for the purpose of reinforcement. In addition, metal (for example: galvanized steel sheet: thickness 3.
A metal (eg, stainless steel bar) hinge pin 34 and a lock-out cam 32 are provided at the angle 33a of 2 mm).
Is attached with a crimp stop.

The hinge pin 34 serves as a rotation axis for opening and closing the refrigerator compartment door 2. A hinge cover 33b is formed by insert molding, and a lock cam portion 36 including a second cam protrusion 35 described later is formed integrally with the hinge angle 33. Reference numeral 33c denotes a contact receiving portion, which restricts opening of the door when the door is opened.

The upper surface of the hinge pin 34 at the hinge angle 33 supports the corresponding surface of the slide cam 22 and lifts the other portions around the hinge pin 34, so that other movements at the time of door movement or door opening / closing can be performed. It serves to prevent friction and snagging of the parts, and much of the door opening resistance is also applied to the upper surface of the hinge pin 34.

Since the cam lever 21 shown in FIG. 5 pushes the front portion of the strong lock-out cam 32 when the door is opened, the cam lever 21 shown in FIG. 5 is easy to push even in position, and an extra member is provided or further reinforced. There is no need to do so, the structure is simplified and inexpensive, and since it is close to one of the hinge pins 34 that mainly applies the opening resistance in moving the door, the moving operation force by the lever is transmitted to the vicinity of the portion where the opening resistance is applied, A door opening / closing mechanism that achieves a stable opening operation is obtained.

In FIG. 7, (a) to (d) are attached to a hinge angle (not shown) provided on the upper surface of the refrigerator body 1 with screws or the like, and a slide cam (described later) on the upper right side of the refrigerator compartment door 2 is provided. FIG. 4 is a view showing a lock cam 37 of a lock cam portion corresponding to 40. FIG. 7A is a view showing the lock cam 37 as viewed from above, and the lock cam on the left has a shape obtained by inverting the drawing in the left-right direction.

FIGS. 7B to 7D respectively show FIGS.
It is the sectional view on the AA line, the sectional view on the BB line, and the sectional view on the CC line of (a). At one end of the lock cam 37, a through hole 38 into which the hinge pin 34 is inserted is provided. An arc-shaped second cam projection 35 is formed concentrically with the through hole 38.

In this structure, the cam lever 21 shown in FIGS. 2 and 5 is located only below the door, and when the door is opened, the cam lever 21 pushes the lock-out cam 39 of the lock cam 37 located above the door. Since the resin material (for example, polyacetal resin) is sufficient in strength, the through hole 38 of the lock cam 37 is made of resin at a position facing the outer lock cam 32 and in a similar shape.
A cam 39 outside the lock is integrally formed in the vicinity of the end different from the end. The outside lock cam 39 has a large engagement area with the other slide outside cam 43.
The engagement relationship is the same, and is longer than the cam 32 outside the lock.

In FIG. 8, (a), (b) and (c) show a slide cam 40 serving as a slide cam portion located on the upper right side of the refrigerator compartment door 2 corresponding to the lock cam 37 in FIG. Is a plan view, a front sectional view, and a rear view of the slide cam 40. FIG. The slide cam 40 has a first groove cam 41 for guiding the engagement with the hinge pin 34 to be disengaged from the first locking position, and a hinge pin 34 from the first locking position.
Is provided with a second grooved cam 42 for guiding to a second locking position that functions as a rotation shaft.

The slide cam 40 is engaged with the slide outer cam 43 arranged to be engaged with the lock outer cam 39 shown in FIG. 7 at the second locking position with the second cam projection 35 shown in FIG. The first cam projection 44 is arranged so that Then, the slide cam 40 is mounted on the door cap 9.
It is screwed to a reinforcing plate (not shown) with (shown in FIG. 1) interposed therebetween.

Further, positioning projections 40a and 40b are provided on the back side (the reinforcing plate side) of the slide cam 40.
Then, the positioning protrusion 4 on the back side of the first cam protrusion 44
0a is the second position when the second cam projection 35 of FIG.
It is provided at or near a position serving as the rotation axis of the locking position.

Each of the positioning projections 40a and 40b is also fitted into a positioning hole (not shown) provided in a reinforcing plate (not shown) with the upper side of the door cap 9 interposed therebetween. , The mutual positional relationship, such as the position of the first locking position and the second locking position, is accurately maintained.

That is, the linear expansion coefficient is lower than that of the resin.
The positioning protrusions 40 are provided on a reinforcing plate made of metal or the like.
Since the slide cam 40 is securely mounted in an accurate positional relationship with reference to a and 40b, the positional relationship does not change much due to a temperature change or the like, and the refrigerating compartment door 2 always opens and closes stably. Has been obtained. In addition, the lock cam 37 on the other side is similarly attached to a member made of a material similar or similar to the reinforcing plate having a low linear expansion coefficient, such as metal, so that the above-mentioned effect is further improved.

The positioning projections 40 a are used to make the fitting relationship with the positioning holes on the mating side accurate, and the second locking position serving as a rotation axis is located near both ends of the refrigerator compartment door 2. In order to provide it, the diameter is not so large (for example: diameter = about 6 mm). Further, when the diameter is increased, it is necessary to extend both ends of the reinforcing plate on the other side further outward and to increase the reinforcing plate for maintaining strength, and the second locking position is provided near both ends of the refrigerator compartment door 2. Therefore, the diameter of the positioning projection 40a is not made too large.

If the door rotation shaft (the second locking position) is provided near both ends of the refrigerator compartment door 2, the packing 29b (shown in FIG. 4) is less likely to twist when the door is opened and closed. The operation becomes good, and the small diameter of the positioning projection 40a leads to an improvement in the door opening / closing operation.

Further, since the positioning projections 40a are provided at or near the positions where the slide cams 40 become the second locking positions, the positional relationship between the left and right second locking positions and the like is further improved. It also keeps it accurate.

Further, ribs 40c are provided in the left-right direction when the refrigerator compartment door 2 is closed, and the roots of the positioning projections 40a are reinforced. By providing the ribs 40c, the slide cam 4 is sandwiched with the upper door cap 9 interposed therebetween.
0 is a moving force caused by friction of the screw head against the surface of the slide cam 40 when the screw is fixed to a reinforcing plate (not shown).
The bending of the positioning projection 40a can be prevented, and the displacement of the slide cam 40 due to the screwing can be prevented.

For this reason, the slide cam 4 with screws is used.
The movement of 0 is prevented by the rib 40c, and the positional relationship such as the second locking position is more accurately maintained. Thus, the opening / closing operation of the refrigerator compartment door 2 becomes more reliable. The reason why the ribs 40c are provided in the left and right directions when the refrigerator compartment door 2 is closed and reinforced is as follows.
This is because the prevention of the displacement of the slide cam 40 in the left-right direction is very useful for reliably opening and closing the refrigerator compartment door 2.

Since the height of the rib 40c is smaller than the thickness of the upper part 9 of the door cap, the periphery of a reinforcing plate (not shown) facing the positioning projection 40a may be formed as a flat surface. It is possible to form the reinforcing plate easily and improve the productivity, and since the shape is flat and simple, the reliability of the finished dimension is also increased.

In FIG. 8B, the positioning projections 40a and the ribs 40c are positioned on the paper of FIG.
Since it is at a floating position before the cross section, it should be drawn with an imaginary line (for example: a two-dot chain line). However, since the drawing is not clear, it is drawn with a solid line for convenience.

Although the positioning protrusions are cylindrical in the above description, the present invention is not limited to the above-described shapes, and any other protrusions such as prisms and cross-shaped ribs may be used except for the strength surface and workability. The effect is obtained.

Further, instead of the rib 40c, a concave hole as shown in this figure is provided in the positioning protrusion 40a, and a round pin is pressed into the concave hole, or a screw having a screw head smaller than the outer diameter of the protrusion 40a is provided. The positioning protrusion 40a is screwed into the hole or the like.
Can obtain the same effect as described above.

The above-described effect can be obtained for the slide cam 22 as well.

In FIG. 9, (a) and (b) are views near the slide cam 22 on the lower right side of the refrigerator compartment door 2 shown in FIG. It is. And (c) is the figure which looked at the reinforcing plate 23 of (b) from above. The slide cam 22 is also the same as the slide cam 40 shown in FIG.
1, a second grooved cam 42, a slide outer cam 43, and a first cam projection 44. Also, FIG.
An opening 45 is provided for the cam lever 21 to press the cam 32 outside the lock.

The circular boss 21a serving as the rotation axis of the cam lever 21 is rotatably fitted in the hole 22a of the slide cam 22. Reference numeral 46 denotes a stopper which serves as an opening stop when the refrigerator compartment door 2 is fully opened.
a in the contact receiving portion 33c provided in the hinge angle 33 in FIG.
When a hits, the door will not open any more.

Further, reference numeral 47 denotes a roller assembly, and
When the door is closed, it rides on the upper surface of the hinge angle 33 shown in FIG. 6, supports the load of the refrigerator compartment door 2, serves to keep the airtight state of the front opening 31 of the main body well, and assists the door opening / closing operation. ing. In addition, the slide cam 2
2. The stopper 46 and the roller assembly 47 are screwed to the reinforcing plate 23 via the lower door cap 10.

The positioning projections 22b and 22c are provided on the back side of the slide cam 22 (on the reinforcing plate 23 side). Further, the positioning projection 22b on the back side of the first cam projection 44 is provided at or near a position serving as the rotation axis of the second locking position when engaged with the second cam projection 35.

The respective positioning projections 22b and 22c are also fitted into positioning holes 23a and 23b provided in the reinforcing plate 23 with the lower door cap 10 interposed therebetween, and are provided between left and right slide cams and lock cams. The positional relationship between each other, such as the first locking position and the second locking position, is accurately maintained.

The positioning projection 22b does not have a very large diameter (for example: diameter = about 6 mm) for the same reason as the positioning projection 40a. And
A rib 22d is provided in the left-right direction when the refrigerator compartment door 2 is closed, and the root of the positioning protrusion 22b is reinforced.

Therefore, when the slide cam 22 is screwed to the reinforcing plate 23 with the door cap lower 10 interposed therebetween, the bending of the positioning projection 22b due to the moving force generated by the friction of the screw head against the surface of the slide cam 22 is reduced. Can be prevented. Then, the movement of the slide cam 22 by screwing is prevented by the rib 22d, so that the positional relationship of the second locking position and the like are more accurately maintained, and the opening and closing operation of the refrigerator compartment door 2 is performed in the same manner as described above. It will be more certain.

Further, since the height of the rib 22d is smaller than the thickness of the lower part 10 of the door cap, the periphery of the reinforcing plate 23 facing the positioning projection 22b can be formed as a flat surface, which facilitates the formation. The productivity can be improved, and the reliability of the finished dimensions can be increased as described above.

In FIG. 9B, the positioning projections 22b and the ribs 22d should be drawn by imaginary lines (for example, two-dot chain lines) for the same reason as in FIG. Therefore, it is drawn by a solid line for convenience.

In FIG. 9C, the reinforcing plate 23
The positioning hole 23a provided at the bottom is provided with a diameter (for example: diameter = about 6 m) corresponding to the diameter of the positioning projection 22b.
m), a width smaller than the diameter (e.g., 5.9 m) is defined as the center distribution of the circle in the front-rear direction (vertical direction in this drawing).
m) and a part is press-fitted.

Therefore, the positioning projections 22b can be more securely fitted into the positioning holes 23a, and the positional relationship such as the second locking position in the left-right direction when the refrigerator compartment door 2 is closed can be more accurately determined. , And the opening / closing operation of the refrigerator compartment door 2 is further ensured.

The diameter of the basic circle of the positioning hole 23a is determined in consideration of the dimensional variation in the fitting relationship.
The diameter may be slightly larger than the diameter of the positioning projection 22b (for example: about 6 + 0.05 mm in diameter).

In this figure, as described above, the front-rear direction is set so as to have a width smaller than the diameter in the center distribution of the circle and a part of the circle is press-fitted. The positioning projections 22b and the positioning holes 23a are left in the left-right direction to form a fitting relationship to prevent the influence of shaving or deformation of the press-fitted portion, and to further maintain the accuracy of the positional relationship. In the case where there is no concern about the influence or the influence is small, the same or similar effect can be obtained even if the press-fitting relationship is set in the left-right direction or another direction.

Further, the shape of the positioning hole 23a may be an ellipse or an ellipse, and a part may be press-fitted. Further, the positioning hole may be a round hole, and the positioning protrusion may be press-fitted into the positioning hole. Therefore, the same effect can be obtained even if a part is deformed into a shape having a size larger than the round hole. And
The shape of the positioning hole is not limited to a round hole, and the same effect as described above can be obtained as long as the shape can maintain the fitting relationship (for example: a square hole or a key-like hole).

The positioning holes 2 provided in the reinforcing plate 23
If the non-return side of 3a is set to the slide cam 22 side and processed so that an edge does not stand on the press-fit side of the positioning projection 22b, the positioning projection 22b is not scraped off by the edge, and the positional relationship can be accurately determined. Press-fitting can be carried out in a state where it is maintained, and more accurate positional relationships are maintained.

In FIG. 9B, the stopper 46,
The illustration of the roller assembly 47 and the door plate 8 is omitted because it becomes complicated.

Although the positioning hole 23a provided in the reinforcing plate 23 is provided as described above, the same effect as described above can be obtained by providing a corresponding concave portion for fitting instead of the hole.
The reinforcing plate 23 further increases in strength.

In FIG. 10, (a) to (c) show the lock cam portion 3 shown in FIG. 6 when the right side of the lower door of the refrigerator compartment door 2 is opened.
FIG. 10 is a view showing a relative positional relationship between the slide cam 22 and the slide cam 22 of FIG. 9, wherein (a) is a view showing a closed state of the refrigerator compartment door 2, and a cam mechanism including a lock cam portion 36 and the slide cam 22 is a first mechanism.
It is in the locked position.

At this time, the first groove cams 41 provided on the left and right slide cams 22 are formed so as to face diagonally inward of the door, respectively, and are regulated by the hinge pins 34, so that the user can use the first cams 41. Even if the door and the grip 7d of the handle 7 are simultaneously pulled forward from both the left and right sides, the door does not fall off the main body. Also, at this time, the lock-out cam 32 prevents the slide-out cam 43 from moving forward, which also helps prevent the door from falling off.

(B) shows a state in which the door 7 starts to open from the right side by grasping the grip 7d of the handle 7 on the right side of the door shown in FIG. 4 and pulling it slightly forward.

At this time, when the grip 7d is slightly pulled toward the user,
The cam lever 21 rotates clockwise about the rotation center 19c,
The pushing surface 21b of the cam lever 21 pushes the right front end of the outer cam 32 backward. Therefore, due to the reaction, the right wall surface of the first groove cam 41 on the right slide cam 22 becomes
It moves diagonally forward while hitting the hinge pin 34 of the right lock cam portion 36, and the right side of the refrigerator compartment door 2 moves diagonally right forward.

At the same time, the rear wall surface 42a of the second groove cam 42 on the left slide cam 22 moves obliquely and rearward while hitting the hinge pin 34 of the left lock cam portion 36, and the left side of the refrigerator compartment door 2 is oblique. Move right back.

(C) shows a state in which the grip 7d shown in FIG. 4 is further pulled forward, and the door is further opened from the right side. At this time, the right cam lever 21 further pushes the right front end of the outer lock cam 32 rearward, and the sliding surface 43a of the outer slide cam 43 on the right side of the door slides with the slide surface 32c of the outer lock cam 32. become.

Then, the first groove cam 41 guided by the right hinge pin 34 further moves the door diagonally right and forward,
The left side of the door is the wall surface 42a at the back of the left second groove cam 42.
Moves further obliquely and rearward while hitting the hinge pin 34 of the left lock cam portion 36, and the left side of the refrigerator compartment door 2 further moves obliquely rightward and rearward.

At this time, the contact portion 7 in FIG.
e pulls the grip portion 7d further forward, hits the contact receiving portion 15c of the handle base 15, and even if the grip portion 7d is further pulled further forward, the cam lever 21
Does not push the lock-out cam 32 any more, after which the handle 7 functions as a normal handle.

The pushing surface 21b of the cam lever 21, which pushes the front of the unlocked cam 32 on the right side of the door, is almost completely moved while the front of the unlocked cam 32 is being pushed.
As it goes to the center side of the, it becomes the position of the front. For this reason, the front of the lock-out cam 32 is pushed obliquely from the front right side, and as the reaction force, a force acts to move the right refrigerator compartment door 2 to the front right side.

This is because the front of the lock outside cam 32 is
It means that you are pushing in the direction opposite to the opening direction of the door. Then, the above-described force for moving the refrigerator compartment door 2 to the right front facilitates the movement of the first groove cam 41 on the right slide cam 22 along the outer periphery of the right hinge pin 34.

Also, the slide cam 22 on the left side of the door is simultaneously pulled to the right of the door by the movement of the pressing surface 21b, so that the left second grooved cam 42 easily moves along the outer periphery of the left hinge pin 34, The left slide cam 22 can easily take the second locking position.

Therefore, the pressing surface 2 of the cam lever 21
1b moves the refrigerator compartment door 2 to the second position.
It will work to move to the locking position, the door can be easily moved when the door is opened, and the door will move reliably,
A door opening / closing mechanism with a good door opening operation can be obtained.

When the doors (a) to (c) are operated,
The pushing surface 21b of the left cam lever 21 is in such a degree that it contacts the left outside lock cam 32, and the left slide cam 22
The shape does not hinder the movement of. The relationship between the left pushing surface 21b and the unlocked cam 32 is maintained while the left pushing surface 21b approaches the left unlocked cam 32 when the door is opened and closed. At this time, the left pressing surface 21
If a slight gap is provided between the slide cam 22 and the lock-out cam 32, the push surface 2
There is no danger of an abnormal sound being generated due to the rubbing of the cam 1b and the outer lock cam 32.

In FIG. 10 (a), when the user simultaneously pulls the handles 6, 7 (shown in FIG. 1) forward from both the left and right sides, the left and right cam levers 21 of each of the out-of-lock cams 32 are used. By pressing the front part, the refrigerating compartment door 2 tries to move to the front simultaneously at the left and right by the reaction. Then, the left and right hinge pins 34 are pressed against the wall surfaces of the first grooved cams 41 provided on the left and right slide cams 22 and inclined obliquely inside the doors, respectively, so that the refrigerator compartment door 2 does not move any further forward. It has become.

However, the left and right handles 6, 7 are simultaneously pulled further forward by an extraordinarily strong force over the weight of the entire body, and the force applied to the handles 6, 7 to open the door is:
Completely unlocked cam 32 through left and right cam levers 21
The left and right hinge pins 34 deform the wall surfaces of the respective first grooved cams 41, and the refrigerator compartment door 2 slightly moves forward and left at the same time in the left and right directions. The front portions respectively come into contact with the cams 32 outside the lock.

Further, the left and right handles 6 and 7 are simultaneously pulled forward by an abnormally strong force. When the refrigerating compartment door 2 continues to move forward, the slide outer cam 43, the lock outer cam 32 and the first The wall surface of the groove cam 41, the hinge pin 34, etc. are deformed, fall down, etc., so that the subsequent opening / closing operation of the door cannot be performed well.
3 and the wall surface of the first grooved cam 41 may be damaged, and the refrigerator door 2 may fall off from the main body.

Therefore, as shown in FIG. 5, the lower shaft 19 is formed of an elastic body (for example: cross section = round, outer diameter =
4 mm, material = SWRH) and the elastic function is provided, and the left and right hinge pins 34 are pressed on the wall surface of the first grooved cam 41 by pushing the front portions of the respective lock outer cams 32 with the left and right cam levers 21. After being pressed, even if the left and right handles 6 and 7 are simultaneously pulled forward with an extraordinarily strong force, the lower shaft 19 is temporarily twisted in the rotation direction, and the further force is applied to the outer lock cam 32. Can be set so that it is not transmitted to the front of the vehicle.

As a result, deformation, fall and breakage of the slide outer cam 43, the lock outer cam 32, the wall surface of the first grooved cam 41, the hinge pin 34, and the like can be prevented, and good operability of opening and closing the refrigerator compartment door 2 can be maintained. And the prevention of the refrigerator compartment door 2 from falling off from the main body is further ensured. In addition, an unreasonable load such as an impact load can be relieved by the action portions such as the slide outer cam 43 and the lock outer cam 32, and the same effect can be obtained with respect to these loads.

Further, as shown in FIG. 5, the pressing surface 21b
And the cam lever 21 are formed of an elastic body (for example: a spring material such as hard steel or stainless steel, an elastic body containing rubber or resin material, or a combination thereof) to provide an elastic function. However, in the same case as described above, after the respective hinge pins 34 are pressed against the wall surfaces of the left and right first groove cams 41, even if the left and right handles 6, 7 are simultaneously pulled forward with an extraordinarily strong force, The cam lever 21 and the pressing surface 21b formed of an elastic body or the like can be temporarily deformed so that no more force is transmitted to the front portion of the outer lock cam 32, and the same effect as described above can be obtained.

Further, as shown in FIG. 5, the lock-out cam 32 is formed into a structure including an elastic body as described above, and the pushing surface 2 of the lock-out cam 32 to be operated by the lever type means is used.
When the contact portion with 1b and its surroundings have an elastic function,
In the case similar to the above, the contact portion of the structure of the outer lock cam 32 including the elastic body with the pressing surface 21b and the periphery thereof are temporarily deformed, and the same effect as described above is obtained.

The above is not limited to the structure shown in FIG.
A structure including the lever's action point of the lever type means (for example: a handle having a fulcrum, between the end of the handle giving the door opening force on the side opposite to the force point and the fulcrum, and the fulcrum. At least a portion of the handle portion, etc.) may be provided with the same elastic function as described above, or a portion to be acted on by leverage of the lever type means (for example, a handle having a fulcrum, which is opposed to the force point and the fulcrum). At least a part of the end of the handle on the side of the handle that provides the door opening force has an elastic function (for example, the contact part is formed in a convex shape with a leaf spring on the contact part side). Or by making the outer box concave, etc., the leaf spring is attached to the outer box in such a shape relationship as to bend.

A compression spring is placed in the cylinder, a rod is provided in the cylinder on the contact portion side so as to be movable back and forth, and the compression spring has a cushioning function, and the cylinder is attached to the outer case. The same effect can be obtained even if at least one of the levers is provided on the refrigerator compartment door 2 or the refrigerator main body 1 side.

The above-mentioned temporary deformation and torsion return to the original shape, etc., except for the above-mentioned abnormal load, etc. In normal use, the above-mentioned deformation, etc. is very small, and it is difficult for each operation. It is set to have no effect.

Each of the above-mentioned effects can be obtained independently in each case. In some cases, even if each of the above-mentioned elastic functions is appropriately combined to adjust and provide each function,
Similar effects can be obtained.

FIGS. 11A to 11C show the relationship between the relative positions of the lock cam portion 36 and the slide cam 22 when the right side of the refrigerator compartment door 2 is further opened than in FIG. 10A shows a state in which the door is further pulled forward with the grip 7d shown in FIG. 10 in FIG. 10C and the right side of the door is further opened. At this time, the circular portion 42b of the second grooved cam 42 on the left side of the door is
4 and the slide cam 22 on the left is in the second position.
The lock position is reached.

Then, the left first cam projection 44 starts engaging with the second cam projection 35, and the first cam projection 44 starts to be slid and guided. In addition, on the right side of the door,
Slide surface 43b slides on a circular arc having the slide surface 32d of the outer lock cam 32 and the left hinge pin 34 as a rotation axis.

Therefore, the left slide cam 22 is locked so as not to come off from the left hinge pin 34, so that the door is prevented from dropping from the main body, and the door can be opened and closed reliably.

Further, when the door is rotated, the inner portion 41 of the right first grooved cam 41 is rotated around the left hinge pin 34 as a rotation axis.
The right side of a moves while being in contact with the hinge pin 34, and then the engagement between the right side hinge pin 34 and the first grooved cam 41 is released.

Further, the inner part 41 of the right first grooved cam 41 is formed.
The engagement with the hinge pin 34 in FIG. 7A assists when the outer cam 43 or the outer lock cam 32 is broken or when the first cam projection 44 on the left side engages with the second cam projection 35.

When the first cam projection 44 on the left side starts to engage with the second cam projection 35 and the first cam projection 44 starts to be slid and guided, the positions of the slide cam 22 on the left side and the lock cam portion 36 are shifted. If the relationship is not normal and the slide cam 22 is mounted to be shifted to the left from the set value, or if the slide cam 22 is shifted to the left from the set value, the slide outer cam 43 on the left is out of lock. Cam 3
2 may be located on the left side.

At this time, when an external force for moving the refrigerator compartment door 2 forward is applied to the left side of the refrigerator compartment door 2 (for example, pulling the handle 6 in FIG. 1 toward the user), the first cam projection 44 and the second cam projection 3 on the left side.
5, the first groove cam 41 can pass through the hinge pin 34 on the left side, and the first groove cam 41 on the right side.
Of the refrigerator compartment door 2 is separated from the hinge pin 34 on the left side, and the refrigerator compartment door 2 falls off.

Therefore, the positional relationship between the left and right slide cams 22 and the lock cam portion 36 must always be maintained at the set value, and the positioning projections 22b, 22c, 40a, 40b shown in FIGS. And positioning holes 23
a and 23b will play a very important role.

Then, as shown in FIG. 11B, when the door is further opened from the right side with the grip portion 7d, the engagement between the outer lock cam 32 and the outer slide cam 43 of each right side cam mechanism is released. The engagement between the right lock cam portion 36 and the slide cam 22 is released.

On the left side of the door, the sliding surface 43c of the outer cam 43 is
And the sliding surface 32e of the outer lock cam 32 slides, and the outer slide cam 43 is slidably guided by the outer lock cam 32.

Thereafter, as shown in FIG. 11C,
Only by the engagement of the left first cam projection 44 and the second cam projection 35, the left slide cam 22 is
, And the door is opened around the axis center of the left hinge pin 34 as the center of rotation.

FIGS. 10 and 11 show the slide cam 22 and the lock cam portion of the refrigerator compartment door 2 when the right side of the door is opened by holding the grip 7d of the handle 7 on the right side of the door shown in FIG. 36 shows the relationship of the refrigerator compartment door 2
The same applies to the relationship between the lock cam 37 and the slide cam 40 above.

When closing the right side of the opened door from the state shown in FIG. 11C, it is preferable to push the vicinity of the right end of the front of the door by hand. 10 and 11 are the same as those in FIGS. 10 and 11, and since the grip 7d of the handle 7 is not pulled toward the user, only the cam lever 21 is moved by the reaction force of the spring 25 in FIG.
0 (a). When the left side of the door is opened, the relationship shown in FIGS. 10 and 11 is reversed in the left-right direction.

FIG. 12 shows another embodiment. FIG. 5 is a sectional view taken along the line BB near the lower part 10 of the door cap in a closed state of the right side of the refrigerator compartment door 2 in FIG. FIG. The equivalent cross-sectional view near the lower left side door cap 10 is obtained by inverting this drawing in the left-right direction.

A lower portion 48b of the lower shaft 48 corresponding to the lower shaft 19 is mounted so as to surround a cam lever 50 serving as an arm incorporated in a slide cam 49 as a slide cam from below. Have been. The slide cam 49 and the cam lever 50 have the same structure except that the rotation shaft center 48c of the lower shaft 48 is located behind the front end of the outer lock cam 32.

The pressing surface 50b of the cam lever 50 for pushing the front of the unlocked cam 32 is
Most of the time when the front of the lock outer cam 32 is pressed, the rotation shaft center 48c serving as a lever of the lower shaft 48 is located rearward of the front end of the lock outer cam 32. The front of the door 32 is pushed obliquely from the right side (side of the door) from the front, and as a reaction force, a force acts to move the refrigerator compartment door 2 to the right (side of the door).

As a result, a part of the moving operation force of the cam lever 50 as a lever arm acts to move the door to the second locking position, so that the door can be easily moved when the door is opened. The door can be reliably moved, and a door opening / closing mechanism with a favorable door opening operation can be obtained.

When at least one of the lower shaft 48, the cam lever 50, and the pressing surface 50b is made to have a structure including an elastic body as shown in FIGS.
It is possible to prevent deformation or breakage of a place where a load is applied by the lever type means, and the same effect is obtained.

When a lever-type door opening / closing mechanism is provided, a load greater than a normal opening / closing operation is applied to each of the cam mechanisms. At the same time, pulling the handle while pulling the weight).
If the cam mechanisms are attached with thicker screws than before, after reinforcing the b, 22c, 40a, and 40b, more accurate positional relationship between the above and the more durable cam mechanism can be attached, and the lever can be mounted. -Type door opening and closing mechanism has been strengthened,
Thus, a door opening / closing mechanism that is more stable than ever and has good operability that is stable and forever is obtained without further fear of lowering the operability in the opening / closing operation of the door.

Further, although the urethane foam is used as the heat insulating material 2a in the above, other foam heat insulating materials may be used, or heat insulating materials such as glass wool may be used. Further, although the above is a case where the cam lever which is the lever arm is provided only below the door, it is apparent that the operation of the door is further improved if a cam lever is provided at the corresponding position above the door. .

[0148] Although the above description has been made with respect to the left and right doors of the refrigerator, the same effects can be obtained with other doors. A similar effect can be obtained even if it is on the lower surface.

[0149] In the above, the left-right direction means the left-right direction when the refrigerator is viewed from the front, and the front-rear direction means the front-back direction when the refrigerator is viewed from the front. Also, in this drawing, hatching is omitted for portions showing a thin cross section such as a plate thickness.

[0150]

Since the door opening / closing mechanism of the present invention has the above-mentioned structure, not only the operability of opening / closing the door by the lever-type means is improved, but also because the lever-type means has an elastic function, the impact load and the like can be improved. The excessive load can be relieved in the action section, preventing deformation and breakage of the places where the load is applied,
Good operability in opening and closing the door can be maintained,
It is possible to obtain a door opening / closing mechanism that has stable and good operability forever and has increased safety.

[Brief description of the drawings]

FIG. 1 is a front view of a refrigerator provided with a door opening / closing mechanism of the present invention.

FIG. 2 is an enlarged view of the vicinity of a handle by the lever type means of FIG. 1;

FIG. 3 is a view of the handle support and the handle base of FIG. 2 as viewed from below.

FIG. 4 is a sectional view taken along line AA of FIG. 1;

FIG. 5 is a sectional view taken along line BB of FIG. 1;

FIG. 6 is a view showing a hinge angle below a door in the door opening / closing mechanism of the present invention.

FIG. 7 is a view showing a lock cam above a door in the door opening / closing mechanism of the present invention.

FIG. 8 is a view showing a slide cam above a door in the door opening / closing mechanism of the present invention.

FIG. 9 is a partially enlarged view showing a part of the lower side of the door near the slide cam of the door opening and closing mechanism of the present invention and its related parts.

FIG. 10 is a view showing the operation of the door opening / closing mechanism of the present invention.

FIG. 11 is a view showing the operation of the door opening / closing mechanism of the present invention.

FIG. 12 is a view showing another embodiment of the door opening / closing mechanism of the present invention, and is a view corresponding to a cross-sectional view taken along line BB of FIG. 1;

[Explanation of symbols]

 2 Refrigerator compartment door (door) 19 Shaft (connecting member) 21 Cam lever (arm portion) 48 Shaft (connecting member) 50 Cam lever (arm portion) 32 Out-of-lock cam (action target portion)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masao Kawabata 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka F-term (reference) 3L102 JA01 KA04 KB08 KD10

Claims (6)

[Claims] 1. A door which is opened and closed around the opening by opening / closing the opening, and the door is separated from the periphery of the opening by a lever by a predetermined distance. A door opening / closing mechanism characterized by having an elastic function for operation. 2. A door is provided around the opening to open and close the opening by contacting with and separating from the opening, and the door is separated from the periphery of the opening by a predetermined distance by leverage means. A door opening / closing mechanism, wherein the lever and the point of force are connected by a connecting member, and at least a part of the lever type means has an elastic function with respect to the separating operation. 3. The door opening / closing mechanism according to claim 2, wherein the connecting member comprises a shaft, and the shaft comprises an elastic body. 4. The lever-type means, which is the point of application of a lever, comprises an arm, and at least the point of application of the arm has an elastic function. Item 3. The door opening / closing mechanism according to Item 3. 5. The door opening / closing mechanism according to claim 1, wherein at least a part of the operation target portion of the lever type means has an elastic function. 6. The door is provided with a cam mechanism for engaging and disengaging the door and the main body on both sides of the door, and the cam mechanism has symmetrical first locking positions and second locking positions on both sides of the door. When the door is closed, the cam mechanisms on both sides take the first locking position, and when one of the two sides of the door is opened, the door moves to the door open side by a predetermined distance and the second engagement The lever type means which takes a stop position, is rotatably locked in the second locking position, and is provided on at least one of both sides of the door to separate the door by a predetermined distance. The door opening and closing mechanism according to any one of the above.