JP2001147077A - Door opening and closing mechanism and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a door opening and closing mechanism which can improve production efficiency and can raise the yield, and its manufacture. SOLUTION: This door opening and closing mechanism is equipped with a hinge 14 which constitutes a rotary shaft 8 in the second lock position where the door rotates, the second groove cam 4 which can relatively shift, engaging with the hinge pin 14, a lock outside cam 11, which has two sliding faces roughly circular in cross section centering around each of rotary shafts 8 on both sides of the door, being provided at the body, and a slide outside cam 9 which has two sliding faces roughly circular in cross section centering around each of the rotary shafts on both sides of the door, being provided at the door, and is guided to slide by the lock outside cam 11, and a distance K2 in the diametrical direction between a contact Q4 between a center line P2, passing the rotation center of the door and the lock outside cam 11 and a contact Q3 between a center line P3 and the slide outside cam 9 is made larger than the variation of an outermost distance L between the second groove cams 4 arranged on both sides of the door, under the condition that the slide outside cam 9 is guided to slide by the lock outside cam 11.

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, and more particularly to a door opening / closing mechanism that can be opened and closed from either side.

[0002]

2. Description of the Related Art A conventional door opening / closing mechanism which can be opened / closed from either side of a door is disclosed, for example, in JP-A-9-303942. This door opening and closing mechanism is shown in FIG.
As shown in (b) and (c), the door opening and closing mechanism is provided with cam mechanisms for engaging and disengaging the door and the main body (both not shown) on both sides of the door.

Each of these cam mechanisms has a hinge pin 14
And a slide cam member 1 having first and second grooved cams 3 and 4 which can move by engaging with a hinge pin 14. In the closed state of the door, the cam mechanisms on both sides are arranged at the first locking position as shown in FIG. 55 (a), and the mounted state of the door is held by the engagement force between the hinge pin 14 and the first grooved cam 3.

When one of the doors (not shown) is pulled from this state, the first grooved cam 3 moves along the hinge pin 14 of one of the cam mechanisms, and the engagement is released. In the other cam mechanism, the second grooved cam 4 moves to the second locking position along the hinge pin 14 as shown in FIG. At this time,
The slide cam member 1 is supported by the hinge pin 14 by the circular portion 4a of the second grooved cam 4, and the door is locked rotatably.

[0005] The lock cam member 2 and the slide cam member 1 respectively have outer lock cams 11 and 12 and outer slide cams 9 and 9.
10 are provided integrally. Out-of-lock cams 11, 12
And the outer cams 9 and 10 are formed having two common cylindrical surfaces (eg, 10a, 10b and 12a, 12b) centered on the hinge pins 14 on both sides of the door at the second locking position,
They are arranged facing each other. Then, with the rotation of the door about the hinge pin 14, as shown in FIG. 55 (c), the outer lock cam 12 and the outer slide cam 10 start engaging with each other and slide with each other. Will be guided.

Further, the first cam projection 5 projecting concentrically with the circular portion 4a is slid and guided by the second cam projection 6 projecting concentrically with the hinge pin 14 by the rotation of the door. As a result, the engagement between the second grooved cam 4 and the hinge pin 14 is prevented from being released, and the door can be rotated. As a result, the door can be opened like a normal one-way opening mechanism. The same publication also discloses a configuration in which the doors can be rotated only by the sliding guide of the first cam protrusions 5 by the second cam protrusions 6 without the lock outer cams 11 and 12 and the slide outer cams 9 and 10.

[0007]

However, according to the conventional door opening / closing mechanism having the above structure, before the lock cam member 2 and the slide cam member 1 are engaged, the hinge pin 14 is supported only by the second grooved cam 4. ing. The distance between the left and right slide cam members 1 may fluctuate due to an error in attaching the slide cam member 1 to the support member or the dimensional accuracy of the support member. In addition, if the inside of the door is an integrally foamed heat insulating material filled with foamed polyurethane, the interval between the left and right slide cam members 1 may fluctuate due to fluctuations in the ambient temperature and the foaming ratio during foaming.

For this reason, if the distance between the slide cam members 1 fluctuates and becomes larger than the distance between the hinge pins 14 on both sides of the door, the amount of movement of the second grooved cam 4 in the width direction when the door is opened becomes smaller, and the hinge pin 14 becomes smaller. Can be slid only in a portion that is less than half the circumference of the circular portion 4a. As a result, the second groove cam 4 cannot be supported by the hinge pin 14, and the rotation axis fluctuates and the door cannot be smoothly rotated.
Further, in a configuration in which the lock outer cam 12 and the slide outer cam 10 are not provided, there is a risk that the hinge pin 14 on the side serving as the rotation axis relatively moves in the direction of the first groove cam 3 and the door falls off.

Therefore, if the mounting position of the slide cam member 1 fluctuates, it is necessary to adjust the mounting position and replace the support member, which not only causes a decrease in production efficiency but also reduces the production yield because the support member cannot be used. There was a problem to do.

In addition, even when the door can be opened and closed smoothly without any mounting error when assembling the slide cam member 1, if the ambient temperature rises due to the use environment of a refrigerator or the like in which the door opening and closing mechanism is mounted, the slide cam member 1 is moved. The distance between the slide cam members 1 is increased by the expansion of the support member to be attached,
The same problem as above occurs.

Further, as the door is rotated, the cam 12
The outer slide cam 10 that slides with the outer lock cam 12 is engaged with the outer lock cam 12 before engagement with the outer lock cam 12. For this reason, when the door rotates, there is a problem that the slide outer cam 10 collides with the lock outer cam 12 due to the assembly position of the slide cam member 1 and a change in the mounting position due to temperature, and the door cannot be rotated smoothly.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a door opening / closing mechanism capable of improving production efficiency and yield and a method of manufacturing the same.

[0013]

In order to achieve the above object, the present invention provides a cam mechanism for engaging and disengaging a door and a main body on both sides of a door, and these cam mechanisms are provided on both sides of the door. A symmetrical first locking position and a symmetrical second locking position also on both sides of the door can be taken. When the door is closed, both cam mechanisms also take the first locking position and open one of the doors. When the door slides and the other cam mechanism takes the second locking position, the other cam mechanism is rotatably locked at the second locking position even if the sliding amount of the door changes. It is characterized by:

Further, the present invention provides a cam mechanism for engaging and disengaging the door and the main body on both sides of the door, and these cam mechanisms are provided with symmetrical first locking positions on both sides of the door, and also for the door. The second locking position can be symmetrical on both sides. When the door is closed, the cam mechanisms on both sides also take the first locking position, and when one of the doors is opened, the door slides and the other cam mechanism moves to the second locking position. It takes two locking positions, is rotatably locked at the second locking position, and is relatively movable by engaging with a hinge pin forming a rotation axis at the second locking position and the hinge pin. A grooved cam, wherein the grooved cam has a sliding contact portion with which a part on the inner side of the hinge pin slides when moving from the first locking position to the second locking position.

According to this configuration, when the door is in the first locked position on both the left and right sides, the mounted state of the door is maintained by the engaging force between the hinge pins on both sides and the groove cam. In this state, when one of the right and left sides of the door is pulled, the engagement between one hinge pin and the groove cam is released. The other grooved cam relatively moves along the hinge pin while the sliding contact portion slides on the back side and the near side of the hinge pin, and is engaged at the second locking position to be rotatably locked. Then, the groove cam is supported by the hinge pin, and the door rotates.

According to the present invention, in the door opening / closing mechanism having the above-described structure, the length of the sliding contact portion in the door width direction is made larger than the fluctuation value of the outermost distance between the two groove cams arranged on both sides of the door. It is characterized by: According to this configuration, the hinge pin moves relative to the inside of the groove cam, passes through the sliding contact portion whose door width direction is longer than the variation value of the distance of the groove cam, and moves from the first locking position to the second locking position.
Reach the locking position. Here, the fluctuation value includes an error at the time of mounting the groove cam, expansion due to temperature rise, and the like.

Further, the present invention is characterized in that, in the door opening / closing mechanism having the above structure, the length in the width direction is set to 0.2% or more of the outermost distance between the two groove cams arranged on both sides of the door. And

Further, according to the present invention, there are provided cam mechanisms having groove cams for engaging and disengaging the door and the main body on both sides of the door. These cam mechanisms are provided with symmetrical first locking positions on both sides of the door. The symmetrical second locking position can be taken on both sides of the door, and when the door is closed, the cam mechanisms on both sides are in the first position.
The door is slid when one of the doors is opened, and the other cam mechanism is in a second locked position, and is rotatably locked at the second locked position. An outer cam, and a slide outer cam that is arranged opposite to the lock outer cam and is slidably guided and rotated in an arc shape by the lock outer cam at the second lock position, and when the door is opened, the second lock position is set. On the taking side, a contact point between the outer lock cam at a portion facing the outer cam before sliding and a center line passing through the center of rotation of the door, and a slide at a portion facing the outer lock cam before sliding. The radial distance at the time of sliding between the outer cam and the contact point with the center line passing through the rotation center of the door is set to be larger than the fluctuation value of the outermost distance between the two grooved cams arranged on both sides of the door. Features.

According to this configuration, when the door is in the first locked position on both the left and right sides, the mounted state of the door is maintained by the engagement between the groove cam and the hinge pin. In this state, when one of the left and right sides of the door is pulled, the cam mechanism is released. The other cam mechanism is rotatably locked at the second locking position by the engagement between the groove cam and the hinge pin. Then, the outer slide cam slides with the outer lock cam, and is guided on an arc concentric with the center of rotation of the door, and the door is opened like a normal single-opening mechanism. At this time, the center line passing through the center of rotation of the door and the contact point of the lock outer cam, and the radial distance between the center line and the contact point of the slide outer cam at the time of sliding, are two distances arranged on both sides of the door. It is larger than the fluctuation value of the outermost distance of the groove cam. Here, the fluctuation value includes an error at the time of mounting the cam outside the slide, expansion due to temperature rise, and the like.

Further, the present invention provides a cam mechanism for engaging and disengaging the door and the main body on both sides of the door. These cam mechanisms are provided with symmetrical first locking positions on both sides of the door, and also for the door. The second locking position can be symmetrical on both sides. When the door is closed, the cam mechanisms on both sides also take the first locking position, and when one of the doors is opened, the door slides and the other cam mechanism moves to the second locking position. It takes two locking positions, is rotatably locked at the second locking position, and is relatively movable by engaging with a hinge pin forming a rotation axis at the second locking position and the hinge pin. A grooved cam, an outer lock cam provided on the main body and having two sliding surfaces having a substantially arc-shaped cross section centered on the rotation shafts on both sides of the door, and a rotation cam provided on the door on both sides of the door. Having two sliding surfaces each having a substantially arc-shaped cross section, In a slide outer cam that is slidably guided in and take a second locking position when the door opened side,
The point of contact between the outer lock cam and the center line passing through the center of rotation of the door before sliding, and the outer slide cam and door at the portion facing the outer lock cam before sliding. The sliding distance between the contact and the center line passing through the center of rotation is larger than the fluctuation value of the outermost distance between the two groove cams arranged on both sides of the door.

According to this structure, when the door is in the first locked position on both the left and right sides, the mounted state of the door is held by the engaging force between the hinge pins on both sides and the groove cam. In this state, when one of the right and left sides of the door is pulled, the engagement between one hinge pin and the groove cam is released. The other groove cam relatively moves along the hinge pin, engages at the second locking position, and is rotatably locked. Then, the outer slide cam slides with the outer lock cam, and is guided on an arc concentric with the center of rotation of the door, and the door is opened like a normal single-opening mechanism. At this time, the center line passing through the center of rotation of the door and the contact point of the lock outer cam, and the radial distance between the center line and the contact point of the slide outer cam at the time of sliding, are two distances arranged on both sides of the door. It is larger than the fluctuation value of the outermost distance of the groove cam. Here, the fluctuation value includes an error at the time of mounting the groove cam, expansion due to temperature rise, and the like.

Further, the present invention is characterized in that in the door opening / closing mechanism having the above structure, the two hinge pins are provided on an angle made of a metal member. According to this configuration, expansion and contraction of the distance between the two hinge pins with respect to a temperature change is suppressed.

According to the present invention, in the door opening / closing mechanism having the above-mentioned structure, the radial distance is set to 0.
It is characterized by having been increased to 2% or more. According to this configuration, when the outer slide cam is slid and guided by the outer lock cam, the center line passing through the center of rotation of the door, the contact point of the outer lock cam, and the diameter of the center line and the contact point of the outer slide cam point. The distance in the direction is 0.2% or more of the outermost distance between the two groove cams arranged on both sides of the door.

Further, the present invention is characterized in that in the door opening / closing mechanism having the above structure, when one of the doors is opened, the other is slid in the oblique depth direction. According to this configuration, when one of the doors is opened from the first locking position, the engagement between the one hinge pin and the groove cam is released. The other of the doors slides obliquely in the depth direction, and the other cam mechanism is engaged and rotatably locked at the second locking position.

According to the present invention, in the door opening / closing mechanism having the above-mentioned structure, a packing that comes into contact with the main body when the door is closed is provided on a back surface of the door, and a sliding amount in the depth direction when the door is opened is adjusted by the packing. 1. The distance between the back and the center of rotation
It is characterized in that it is set to 3% to 4%.

According to this configuration, when one of the doors is opened from the first locking position, the engagement between the one hinge pin and the groove cam is released. The other side of the door slides obliquely in the depth direction, and the cam mechanism is rotatably locked at the second locking position. At this time,
The sliding amount in the depth direction of the other side of the door is 2.3% to 4% of the distance between the back surface of the packing and the hinge pin which is the center of rotation of the other side.
%It has become.

Further, the present invention is characterized in that in the door opening / closing mechanism having the above structure, the sliding amount of the door in the width direction is set to 2.5 mm or more. According to this configuration, when one of the doors is opened from the first locking position, the engagement between the one hinge pin and the groove cam is released. The other groove cam slides relatively along the hinge pin, engages at the second locking position, and is rotatably locked. At this time, the sliding amount in the width direction of the other groove cam is 2.5 mm or more.

According to the present invention, in the door opening / closing mechanism having the above-described structure, the outer slide cam has a tip portion including the contact point, which is formed of only a curved surface or a combination of a curved surface and a flat surface. The distance between two contact points that are in contact with the sliding surface is 1.8 mm or more. According to this configuration, both side wall surfaces of the outer slide cam have a slide surface having a substantially arc-shaped cross section centered on the hinge pins on both sides at the second locking position. It is composed of a curved surface that is continuous with a surface or a combination of a curved surface and a plane. The distance between the contact point between one sliding surface and the tip and the contact point between the other sliding surface and the tip is 1.8.
mm or more.

Further, according to the present invention, in the door opening / closing mechanism having the above-mentioned structure, the tip of the lock outer cam including the contact and the tip of the slide outer cam including the contact are in contact with a straight line parallel to the width direction of the main body. The contact between the straight line and the outer slide cam when disposed is farther from the outer lock cam than the contact when the distal end portion is formed by a curved surface having a single radius of curvature in contact with the two sliding surfaces. It is characterized by being arranged on the side. According to this configuration, when the outer lock cam and the outer slide cam slide, the top of the tip of the outer slide cam is disposed at a position farther from the outer lock lock than when formed with a single radius of curvature. .

According to the present invention, in the door opening / closing mechanism having the above structure, the distal end of the outer slide cam has a plurality of radii of curvature, and a radius of curvature closer to the outer lock cam is set to be larger than a radius of curvature farther away. It is characterized by being enlarged. According to this configuration, the tip of the outer slide cam having a curved surface having a plurality of radii of curvature has a larger radius of curvature on the side closer to the outer lock cam. For this reason, when the outer lock cam and the outer slide cam slide, the top of the tip of the outer slide cam is located at a position away from the outer lock cam.

Further, the present invention provides a cam mechanism having a groove cam and a hinge pin for engaging and disengaging the door and the main body on each side of the door, and these cam mechanisms are symmetrical on both sides of the door. Stop position and a second, also symmetrical on both sides of the door
In the closed state of the door, the cam mechanisms on both sides take the first locked position, and when one of the doors is opened, the door slides and the other cam mechanism takes the second locked position. , And is rotatably locked at the second locking position. The outer locking cam disposed on the main body is slidably guided in an arc shape at the second locking position by the outer locking cam. A rotating outer slide cam, wherein when the tip of the outer lock cam and the tip of the outer slide cam are arranged in contact with a straight line parallel to the width direction of the main body, the straight line and the outer lock cam and the The design value of the distance between the respective contacts that come into contact with the outer slide cam is made larger than the variation value of the outermost distance between the two grooved cams arranged on both sides of the door, and manufacturing is performed based on the design value. And

The present invention is also characterized in that in the door opening / closing mechanism having the above structure, the design value is set to 0.2% or more of the outermost distance between the two cam mechanisms arranged on the door side.

[0033]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 are views showing a door opening and closing mechanism according to the first embodiment. FIG. 1 (a)-
(E) is a figure which shows the slide cam member 1 attached to the door side which is not illustrated. In these figures, FIG.
1 (a) is a rear view, FIG. 1 (b) is a plan view, FIG. 1 (c) is a front view, FIG. 1 (d) is a dd sectional view of FIG. 1 (b), FIG.
(E) is an ee cross-sectional view of FIG. 1 (b).

The slide cam member 1 has a first groove cam 3, a second groove cam 4 continuous with the first groove cam 3, and a first cam protrusion 5 provided on the outer periphery of the second groove cam 4. ing. First
The groove cam 3 extends obliquely from one end of the member 1a of the slide cam member 1 toward the center, and continues to a second groove cam 4 formed substantially at the center of the member 1a. The second groove cam 4 has a circular portion 4
a and a straight portion 4b.

As shown in FIG. 1E, the first grooved cam 3 is deep at one end of the member 1a and becomes shallower toward the center. The outer periphery of the first cam projection 5 changes in a snail shape, and its end 5a has a large diameter and serves as a contact portion (step portion) that realizes a cam locking state when the door is closed, which will be described later. Is formed with a chamfered portion 5b in consideration of a fluctuation value described later.

FIGS. 2A to 2E are views showing the lock cam member 2 attached to the main body (not shown). FIG.
(A)-(e) have shown each surface of the lock cam member 2 corresponding to FIG. 1 (a)-(e). The lock cam member 2 has a second cam protrusion 6 that engages with the first cam protrusion 5 of the slide cam member 1. Reference numeral 6a denotes a groove forming the second cam projection 6, and a through hole 7 is provided in the groove 6a. A hinge pin 14 provided on the main body, which will be described later, penetrates through the through hole 7 to serve as a rotation shaft 8 when the door rotates.

In FIG. 1B, the slide cam member 1
The first grooved cam 3 provided on the guide shaft is guided by a hinge pin 14 which is integral with the lock cam member 2 having an axial center serving as the rotation shaft 8. The second grooved cam 4 functions to guide the slide cam member 1 to a position where the slide cam member 1 does not deviate from the rotation shaft 8 (the hinge pin 14). Similarly, the first cam projection 5 provided on the slide cam member 1 is slidably guided by the second cam projection 6 provided on the lock cam member 2 as the door is opened. Thereby, the slide cam member 1 works so as not to come off from the rotating shaft 8, and it is possible to prevent the door from falling off from the main body.

FIGS. 3A to 3D are views showing a state where the slide cam member 1 and the lock cam member 2 are combined. In these figures, each component has a positional relationship of a first locking position in which the door is completely closed.

A pair of slide cam members 1 are attached to the door on the left and right. A pair of lock cam members 2 are provided at corresponding positions on the main body (for example, a refrigerator) side. FIG. 4 (a)
(D) show the engagement / disengagement operation of the slide cam member 1 (shown by a solid line in the figure) and the lock cam member 2 (shown by a broken line in the figure). In these figures, the slide cam member 1 and the lock cam member 2 are each a combination of mutually different parts arranged at symmetric positions. FIG. 10 is a plan view showing a state in which a door hinge that can be opened to the left and right is formed, and shows an operation when the door is opened from the right side.

FIG. 4A shows a state in which the door is completely closed. The slide cam member 1 attached to the door side and the lock cam member 2 attached to the main body side are respectively left and right at the first locking position. Symmetrically combined. At this time, the first groove cams 3 provided on the left and right slide cam members 1 are formed so as to be directed obliquely inside the door. Since each of the first grooved cams 3 is regulated by the hinge pin 14, even if the user pulls the door forward from both left and right sides, the door does not fall off the main body.

FIG. 4B shows a state where the door has begun to open from the right side. The first groove cam 3 provided on the right slide cam member 1 is located at a position where it is disengaged from the hinge pin 14. At this time, the first groove cam 3 is guided by the hinge pin 14, and the door is slightly slid to the right. For this reason,
Second groove cam 4 provided on left slide cam member 1
Slides with a hinge pin 14 passing through a through hole 7 provided in the left lock cam member 2, and the slide cam member 1 is disposed at a second locking position where the slide cam member 1 is not disengaged from the rotation shaft 8 formed by the left hinge pin 14. .

The second grooved cam 4 has a straight portion 4b (FIG. 1).
(See (b)), even if the interval between the left and right second grooved cams 4 becomes large due to an error in assembling, for example, the linear portion 4b engages with the hinge pin 14 to hold the slide cam member 1. can do. Therefore, the hinge pin 14 is not guided relative to the first groove cam 3 and relatively moves, and the position of the center of rotation of the door is stabilized. Further, the danger that the hinge pin 14 is guided by the first grooved cam 3 and the door falls off can be avoided.

At this time, it is desirable that the length of the linear portion 4b be longer than the variation value of the outermost distance L of the second groove cams 4 at both ends of the door, since the hinge pin 14 can be reliably held by the second groove cam 4. The variation value is determined based on a mounting error of the slide cam member 1 and a processing accuracy of a door angle 13 described later for mounting the slide cam member 1.

In addition, if the inside of the door is a one-piece foamed heat insulating material filled with foamed polyurethane, the left and right slide cam members 1 may vary depending on the ambient temperature and the foaming ratio at the time of foaming.
May vary. It is also determined by the thermal expansion of the door angle 13 with an increase in the ambient temperature.
The linear portion 4b may have a curved wall shape as seen in plan view of the wall surface in sliding contact with the hinge pin 14.

Further, as shown in FIGS. 4C and 4D, the first cam projection 5 provided on the left slide cam member 1 is provided on the left lock cam member 2 with the rotation of the door. The second cam projection 6 is slidably guided. Thereby, the slide cam member 1 works so as not to be disengaged from the left rotating shaft 8, and it is possible to prevent the door from falling off and to reliably open and close the door. 4 (b), (c),
In (d), the left cam mechanism is rotatably locked to the second locking position by the first and second cam projections 5 and 6.

Since the first cam projection 5 is formed with a chamfered portion 5b (see FIG. 1B) by a value taking into account the variation in the width direction of the door, the variation of the outermost distance L is reduced. Even if there is, the door is opened by the guide by the chamfered portion 5b, so that the first cam projection 5 is securely fitted to the second cam projection 6.

A similar chamfer may be provided on the second cam projection 6 facing the chamfered portion 5b immediately before the first cam projection 5 is fitted to the second cam projection 6, and the first and second cam projections may be provided. Both 5 and 6 may be provided with chamfers. Further, the corner may be formed in a curved shape instead of the chamfered portion. When the inner groove 3a (see FIG. 48) is provided in the first groove cam 3 of the slide cam member 1, the first cam projection 5 can be further securely fitted to the second cam projection 6. This will be described later. When opening the door from the left side, see FIG.
The movement is symmetrical to the cases of (a) to (d).

Next, FIG. 5A to FIG. 5E and FIG.
(E) is a figure which shows the slide cam member 1 and the lock cam member 2 of the door opening / closing mechanism of 2nd Embodiment, respectively. For convenience of description, the same parts as those in the first embodiment are denoted by the same reference numerals. 5 (a) and 6 (a) are rear views, FIGS. 5 (b) and 6 (b) are plan views, and FIGS.
(C) and FIG. 6 (c) are front views, FIG. 5 (d) and FIG. 6 (d)
5 (b) and 6 (b) are sectional views taken along line d-d of FIG.
6 (e) and FIG. 6 (e) correspond to FIGS. 5 (b) and 6 (b), respectively.
It is -e sectional drawing. In this embodiment, in addition to the configuration of the first embodiment, a slide cam member 1 and a lock cam member 2 are provided.
The outer cam portions 1b, 2b are each formed to extend horizontally.

The outer cam portion 1b is provided with slide outer cams 9 and 10, and the outer cam portion 2b is provided with lock outer cams 11 and 12. In other words, the second embodiment is different from the first embodiment in that the functions of the outer cams 9 and 10 and the outer cams 11 and 12 are added to the first embodiment.

In these figures, a hinge pin 14 provided on the main body, which will be described later, penetrates a through hole 7 provided in the lock cam member 2 and a rotating shaft 8 (FIG. 1) for opening and closing the door.
(See (b)). The first groove cam 3 provided on the slide cam member 1 guides the rotating shaft 8 on the side where the door is opened. The second grooved cam 4 slides on the rotating shaft 8 on the side opposite to the side on which the door is opened, and slides on the circular portion 4 via the linear portion 4b.
a. As a result, the slide cam member 1 is guided to a position where it does not deviate from the rotation shaft 8.

Similarly, the first cam projection 5 provided on the slide cam member 1 is slidably guided by the second cam projection 6 provided on the lock cam member 2 as the door is opened. This prevents the slide cam member 1 from coming off the rotary shaft 8 and prevents the door from falling off the main body.

Further, the slide cam member 1 has slide outer cams 9, 1 and 2 whose both side walls have a substantially circular cross section.
0 is provided. Similarly, the lock cam member 2 includes an outer lock cam 1 having both side walls formed in a substantially circular cross section.
1 and 12 are provided. When the door is opened, the outer slide cams 9 and 10 engage with the outer lock cams 11 and 12 and are slid and guided. As a result, the slide cam member 1 is reliably guided to a position where the slide cam member 1 does not deviate from the rotation shaft 8. Details will be described later. Incidentally, 41 to 44 are positioning pins,
45 to 50 are screw insertion holes for attachment.

FIGS. 7A and 7B are a front view and a top view, respectively, showing a state where the slide cam member 1 and the lock cam member 2 are combined. 7C and 7D are a cross-sectional view taken along the line cc and a line dd in FIG. 7B, respectively. In these figures, each part has a positional relationship when the door is completely closed.

Slide cam member 1 and lock cam member 2
, Combinations of different parts are arranged at symmetrical positions on the door. FIGS. 8A to 8D show a hinge of a door which can be opened right and left by a slide cam member 1 (shown by a solid line in the figure) and a lock cam member 2 (shown by a broken line in the figure). FIG. 3 is a plan view of the state, and is an operation diagram when a door is opened from the right side.

FIG. 8A shows a state in which the door is completely closed. In the figure, the slide cam member 1 attached to the door side and the lock cam member 2 attached to the main body side are in a first locking position where they are completely symmetrically combined. At this time, the first groove cams 3 provided on the left and right slide cam members 1 are formed so as to be directed obliquely inside the door. Since each of the first grooved cams 3 is regulated by the hinge pin 14, even if the user pulls the door forward from both left and right sides, the door does not fall off the main body.

FIG. 8B shows a state in which the door has begun to open from the right side. The first groove cam 3 provided on the right slide cam member 1 is located at a position where it is disengaged from the hinge pin 14. At this time, the first groove cam 3 is guided by the hinge pin 14, and the door is slightly slid to the right. For this reason,
Second groove cam 4 provided on left slide cam member 1
Slides with a hinge pin 14 passing through a through hole 7 provided in the left lock cam member 2, and the slide cam member 1 is disposed at a second locking position where the slide cam member 1 is not disengaged from the rotation shaft 8 formed by the left hinge pin 14. .

The second grooved cam 4 has a straight portion 4b (FIG. 5).
(See (b)), even if the interval between the left and right second grooved cams 4 becomes large due to an error in assembling, for example, the linear portion 4b engages with the hinge pin 14 to hold the slide cam member 1. can do. Therefore, the hinge pin 14 is not guided relative to the first groove cam 3 and relatively moves, and the position of the center of rotation of the door is stabilized. Further, the danger that the hinge pin 14 is guided by the first grooved cam 3 and the door falls off can be avoided.

At this time, it is desirable that the length of the straight portion 4b be larger than the variation value of the outermost distance L of the second groove cams 4 at both ends of the door, since the hinge pin 14 can be securely held by the second groove cam 4. The variation value is determined based on a mounting error of the slide cam member 1 and a processing accuracy of a door angle 13 described later for mounting the slide cam member 1. In addition, if the inside of the door is an integrally foamed heat insulating material filled with foamed polyurethane, the interval between the left and right slide cam members 1 may fluctuate due to fluctuations in the ambient temperature and the foaming ratio during foaming. In addition, the slide cam member 1 accompanying an increase in the ambient temperature
It is also determined by the thermal expansion of

Further, as shown in FIGS. 8C and 8D, the first cam projection 5 provided on the left slide cam member 1 is provided on the left lock cam member 2 with the rotation of the door. The second cam projection 6 is slidably guided. As a result, the slide cam member 1 works so as not to come off from the left rotation shaft 8. And it can prevent that a door falls off from a main body and can perform opening and closing of a door reliably.

In FIG. 8C, the outer slide cams 9 and 10 provided on the right slide cam member 1 are shown.
And the outer lock cams 11 and 12 provided on the right lock cam member 2 are completely engaged. The outer slide cam 10 provided on the left slide cam member 1
And the outer lock cam 12 provided on the left lock cam member 2 has begun to engage.

In FIG. 8D, the outer slide cams 9, 10 provided on the right slide cam member 1 are shown.
And the lock cams 11 and 12 provided on the right lock cam member 2 are out of engagement. The outer slide cam 10 provided on the left slide cam member 1
And the outside lock cam 12 provided on the lock cam member 2 on the left.

Further, as the rotation proceeds, the engagement of the outer slide cam 10 provided on the left slide cam member 1 and the outer lock cam 12 provided on the left lock cam member 2 is disengaged. Then, the outer slide cam 9 provided on the left slide cam member 1 and the outer lock cam 11 provided on the left lock cam member 2 engage (not shown).

With the above operation, the sliding outer cams 9 and 10 slide with the locking outer cams 11 and 12, whereby the entire door is urged in the sliding direction. Therefore, the rotatable lock state of the cam mechanism on the shaft side of the door is securely held. This prevents the door from falling off the main body, and allows the door to be opened and closed reliably.
In addition, when opening a door from the left side, FIG.
The same operation is performed symmetrically to the left and right.

The slide cam member 1 in this embodiment is mounted on the door angle 13 as shown in the exploded views of FIGS. 9 (a) and 9 (b). Further, the lock cam member 2 is attached to the hinge angle 15. At this time, the hinge pin 14 previously attached to the hinge angle 15 penetrates the through hole 7 and projects above the lock cam member 2. The door angle 13 is attached to a door (not shown). The hinge angle 15 is attached to a main body (for example, a refrigerator).
9A and 9B are a front view and a side view, respectively.

Slide cam member 1 and lock cam member 2
Is formed by injection molding, and as a resin material,
A polyamide resin or a polyacetal resin is used.

FIGS. 10A to 10C show that the slide cam member 1 and the lock cam member 2 are mounted at predetermined positions.
It is the front view, side view, and top view which show the state combined. In these figures, the slide cam member 1 and the lock cam member 2 are each provided with a combination of different parts at symmetrical positions. And the hinge of the door which can be opened right and left is formed. Here, the load of the door is received on the upper surface of the hinge pin 14.

FIGS. 11 (a) to 11 (e) show a case where the lock cam member 2, the hinge pin 14 and the hinge angle 15 are integrated into a lock cam member 16. FIG. Therefore, the number of components is one less than in the above-described embodiments of FIGS. 9A and 9B. In these drawings, a lock cam member 16 is provided with a hinge pin 17 serving as a rotation center of the door.
And a mounting portion 18 for mounting to the main body.

As the material of the lock cam member 16, a casting material such as a zinc alloy by die casting is used. In addition,
FIGS. 11A to 11C show a rear view, a plan view, and a front view of the lock cam member 16, respectively, and FIGS. 11D and 11E.
Respectively show a dd sectional view and an ee sectional view of FIG.

FIGS. 12 (a) and 12 (b) are exploded views showing the mounted state of the slide cam member 1 and the lock cam member 16. FIG. 12 (a) is a front view, and FIG. 12 (b) is a side view. is there. In these figures, the slide cam member 1 is attached to a door angle 13 provided on a door (not shown), and the lock cam member 16 is directly attached to a main body (not shown) by an attachment portion 18.

FIGS. 13 (a) to 13 (c) are a front view, a side view, and a plan view showing a state where the slide cam member 1 and the lock cam member 16 are attached to a predetermined place and assembled. As for the slide cam member 1 and the lock cam member 16, combinations of different parts are arranged at symmetric positions of the door. And the state which forms the hinge of the door which can be opened right and left is shown. here,
The structure is such that the load of the door is received on the upper surface of the hinge pin 17.

FIGS. 14A and 14B show the operation when a permanent magnet is attached to the door and the main body. As shown in FIG. 14A, permanent magnets 21 are installed on the back surface of the door 20 and on the front surface of the main body 19 so that the S pole and the N pole face each other and are continuous. When the door is closed, it is magnetically attracted by the two permanent magnets 21 so that confidentiality can be maintained.

When the door is started to be opened, FIG.
As shown in (b), since the S and S poles and the N and N poles face each other, a magnetic repulsive force is generated, the door can be easily opened, and the slide cam member 1 can be easily locked in the second state. It can be guided to the position. Note that, instead of the permanent magnet 21, a magnetic force generator using a contactless power supply device or the like may be used.

FIGS. 15 to 17 are a plan view, a front view and a side view showing a case where a guide roller 20 for regulating the door 20 in the horizontal direction is provided. FIG. 18 is a diagram showing aa-a of FIG.
It is sectional drawing. In these figures, the slide cam member 1 is attached to a door angle 13 provided above and below a door 20.

The lock cam member 2 is attached to hinge angles 15 provided above and below the main body 19. A hinge pin 14 is provided on the hinge angle 15, and the hinge pin 14 is connected to the through hole 7 of the lock cam member 2 (see FIG. 6B).
Penetrates through. A roller base 23 is attached to the lower door angle 13. The shaft pin 24 provided on the roller base 23 is inserted through the plurality of guide rollers 22.

In the above case, when the door 20 is opened, the door 20 is slightly tilted due to the clearance between the hinge pin 14 and the slide cam member 1 and the weight of the door 20 and the weight of the stored articles stored in the door 20. . When the door 20 is closed,
A guide (not shown) attached to a hinge angle 15 provided at the lower portion of the main body 19 and a guide roller 22 integrated with the door 20 restrict the inclination of the door 20 and become horizontal, so that the left and right rotation shafts (14 ) Can be aligned and the opening / closing operation becomes smooth.

FIGS. 19 to 21 are a plan view, a front view, and a side view, respectively, showing an electric mechanism in which the door 20 automatically opens. In these figures, a shaft receiver 31 is attached to a hinge angle 15 provided on the main body 19. The guide shaft 30 is fixed to the shaft receiver 31. A slide plate 28 having a rack 27 is guided by a guide shaft 30 and is slidable in the longitudinal direction.

The left and right detection switches 32 and 33 for detecting the operation position of the slide plate 28 are connected to the hinge angle 15.
Attached to. A standby switch 34 for detecting a standby position of the slide plate 28 is attached to the hinge angle 15. The door angle 1 provided on the door 20
A roller 26 is rotatably attached to 3 by a fixing pin 25.

A drive motor 36 is attached to a motor angle 37 provided on the main body 19. The pinion gear 35 is rotated by the drive motor 36 and is converted into linear motion by the rack 27 that meshes with the pinion gear 35. Thereby, the slide plate 28 slides.

FIGS. 22 (a) to 22 (c) show operation diagrams of the above electric mechanism. FIG. 22A shows a state in which the door 20 is closed, that is, a standby state. At this time, the standby switch 34 is OFF, and the detection switches 32 and 33 are ON.

The user operates a touch switch or the like (not shown) provided on the surface of the door 20 or the main body 19, and
When a signal is issued to open 0 from the right side, drive motor 3
6, the pinion gear 35 rotates counterclockwise. Then, as shown in FIG. 22B, the motion is converted into a linear motion by the rack 27, and the slide plate 28 slides rightward in the figure.

Then, the right slide surface 29 provided on the slide plate 28 pushes the right roller 26 to open the door 20 slightly. At this time, the right detection switch 33 is OFF, and the left detection switch 32 and the standby switch 34 are OFF.
N state. According to FIG. 33 described later, the electric mechanism returns to the state of FIG. However, in the present embodiment, the electric mechanism is further operated so that the door can be automatically opened larger.

That is, as shown in FIG. 22C, when the slide plate 28 is slid to the left in FIG. 22 and the left slide surface 29 pushes the left roller 26, the door 2
0 can be further opened. At this time, the left detection switch 32 is OFF, and the right detection switch 33 and the standby switch 34 are ON. The electric mechanism is shown in FIG.
It returns to the state of 2 (a).

Thereafter, the user manually opens the door 20. When the door 20 is opened from the left side, the above operation is symmetrical. Since the slide surface 29 has a sufficient inclined surface in consideration of a variation value of the outermost distance L of the second groove cam 4 (see FIG. 8A), there is a variation due to assembly or thermal expansion. Does not hinder the opening operation.

FIGS. 23 (a) to 23 (f) and FIGS.
(F) is a detailed view of the slide cam member 51 and the lock cam member 52 of the door opening and closing mechanism according to the third embodiment of the present invention.
23A and 24A are plan views, FIG.
24 (b) is a rear view, FIGS. 23 (c) and 24 (c) are front views, FIGS. 23 (d) and 24 (d) are FIGS.
24 (a), FIG. 23 (e), FIG.
(E) is a side view, FIG. 23 (f), and FIG.
(A), It is ff sectional drawing of FIG.24 (a).

In FIG. 24A, the lock cam member 5
2, a hinge pin 14 (not shown) provided on the main body side penetrates, and the hinge pin 14 serves as a rotation shaft 58 when the door rotates.

In FIG. 23A, the first groove cam 53 provided on the slide cam member 51 is guided by the rotation shaft 58. The second grooved cam 54 has a circular portion 54 a and serves to guide the slide cam member 51 to a position where the slide cam member 51 does not deviate from the rotation shaft 58. Similarly, the first cam protrusion 55 provided on the slide cam member 51 is slidably guided by the second cam protrusion 56 provided on the lock cam member 52 as the door is opened, so that the slide cam member 51 is moved from the rotation shaft 58. Since the door does not come off, it is possible to prevent the door from falling off the main body.

Further, the slide cam member 51 has a slide outer cam 59 having a substantially circular arc-shaped cross section on both side walls.
Is provided. The lock cam member 52 is provided with an outer lock cam 60 in which the cross-sectional shape of both side walls is formed in a substantially arc shape. When the door is opened, the slide outer cam 59 is slidably guided by the lock outer cam 60, so that the slide cam member 51 is more reliably guided to a position where the slide cam member 51 does not come off the rotary shaft 58.

FIGS. 25A to 25F are views showing a state where the slide cam member 51 and the lock cam member 52 are combined. FIGS. 25A to 25C are a plan view, a rear view, and a front view, respectively. FIG.
25D is a side view, and FIG. 25F is a ff cross-sectional view of FIG. 25A. In these figures, each part has a positional relationship when the door is completely closed.

FIGS. 26A to 26D are views showing a state where the slide cam member 51 and the lock cam member 52 are mounted. FIG. 26A is a plan view showing an attached state of the lock cam member 52, FIG. 26B is a plan view showing an attached state of the slide cam member 51, FIG. 26C is a front view, and FIG.
6 (d) is a side view.

In these figures, the slide cam member 5
1 is attached to a door angle 13 provided on a door (not shown). The lock cam member 52 is attached to a hinge angle 15 provided on a main body (not shown). The hinge pin 14 is fixed to the hinge angle 15. A roller 64 rotatably mounted is provided around the hinge pin 14. The hinge pin 14 and the roller 64 are provided in the through hole 5 of the lock cam member 52.
7.

In this embodiment, the slide cam member 51 and the lock cam member 52 are provided with one slide outer cam 59 and one lock cam outer cam 60, respectively. Thereby, the simplification of the component shape is achieved. Further, by providing the hinge pin 14 with the roller 64, the opening and closing of the door is made smooth, and the friction noise generated at the time of opening and closing is reduced.

Slide cam member 51 and lock cam member 5
Reference numeral 2 denotes a combination of different parts, which are arranged at symmetrical positions on the door. FIGS. 27A to 27G
FIG. 4 is a plan view showing a state in which the slide cam member 51 and the lock cam member 52 form a hinge of a door that can be opened left and right, and is an operation diagram when the door is opened from the right side.

FIG. 27A shows a state in which the door is completely closed, and the cam mechanism is in the first locking position. The slide cam member 51 attached to the door side and the lock cam member 52 attached to the main body side are combined symmetrically with each other. At this time, the left and right slide cam members 5
The first groove cams 53 provided in the first cam 1 are formed so as to be directed obliquely inside the door. Since the left and right first groove cams 53 are regulated by the hinge pins 14 and the rollers 64 (not shown), the door does not fall off the main body even if the user pulls the door forward from both left and right sides.

FIGS. 27B and 27C show a state in which the door starts to open from the right side. Right slide cam member 5
The first grooved cam 53 provided at the position 1 deviates from the first locking position. At this time, the first groove cam 53 guided by the hinge pin 14 slightly slides the door to the right. For this reason, the second groove cam 54 provided on the left slide cam member 51 and the hinge pin 14 passing through the through hole 57 provided in the left lock cam member 52 are formed by the slide cam member 51 from the left rotation shaft 58. The positional relationship is not deviated.

Further, as shown in FIG. 27 (d), as the door rotates, the first cam projection 55 provided on the left slide cam member 51 is moved to the left lock cam member 52.
The slide guide is provided on the second cam protrusion 56 provided on the second guide. Thus, the slide cam member 51 works so as not to be displaced from the left rotation shaft 58. Therefore, it is possible to prevent the door from falling off from the main body and to reliably open and close the door.

The outer slide cam 59 provided on the right slide cam member 51 and the right lock cam member 5
Engagement with the non-locking cam 60 provided in 2 is advanced.
The outer slide cam 59 provided on the left slide cam member 51 and the outer lock cam 60 provided on the left lock cam member 52 start to engage with each other.

Then, as shown in FIG. 27 (e), when the door further rotates, the outer slide cam 59 provided on the right slide cam member 51 and the right lock cam member 52
Of the cam 60 outside the lock provided in the cam.
The engagement between the outer slide cam 59 provided on the left slide cam member 51 and the outer lock cam 60 provided on the left lock cam member 52 proceeds.

Further, in FIG. 27F, the outer slide cam 59 provided on the left slide cam member 51 is shown.
Thus, the outer lock cam 60 provided on the left lock cam member 52 is completely engaged. The door is rotated to the position shown in FIG. 27 (g), and finally, the engagement between the outer slide cam 59 provided on the left slide cam member 51 and the outer lock cam 60 provided on the left lock cam member 52 is disengaged.

By the above operation, the door can be prevented from falling off from the main body, and the door can be reliably opened and closed. When the door is opened from the left side, the operation is symmetrical to the operation described above.

FIGS. 28 (a) to 28 (h) show detailed views of the slide cam member 61 of the door opening and closing mechanism according to the fourth embodiment. 28 (a) is a plan view, FIG. 28 (b) is a rear view, FIG. 28 (c) is a front view, FIG. 28 (d) is a dd sectional view of FIG. 28 (a), and FIG. ) Is a side view, and FIGS.
(H) is an ff cross-sectional view of FIG.
It is sectional drawing and hh sectional drawing.

FIGS. 29A to 29H are detailed views of the lock cam member 62. FIG. 29 (a) is a plan view, FIG. 29 (b) is a rear view, FIG. 29 (c) is a front view,
FIG. 29D is a sectional view taken along line dd of FIG.
(E) is a side view, and FIGS. 29 (f) to (i) are each FIG.
9A is an ff sectional view, a gg sectional view, an hh sectional view, an ii sectional view, and a JJ sectional view of FIG.

In FIG. 29A, the lock cam member 6
The hinge pin 14 (not shown) provided on the main body side penetrates a through hole 57 provided in the main body 2, and the rotating shaft 5 when the door is opened and closed.
It becomes 8.

In FIG. 28A, a groove cam 53 provided on a slide cam member 61 guides the rotation shaft 58. The second grooved cam 54 has a circular portion 54 a and functions to guide the slide cam member 61 to a position where it does not deviate from the rotation shaft 58. Similarly, the first cam projection 55 provided on the slide cam member 61 moves as the door is opened as shown in FIG.
The slide cam is slidably guided by a second cam projection 56 provided on the lock cam member 62. As a result, the slide cam member 61 works so as not to come off from the rotary shaft 58, so that the door can be prevented from falling off from the main body.

Further, the slide cam member 61 includes a slide outer cam 5 having a substantially circular cross section on both side walls.
9 are provided. The lock cam member 62 is provided with an outer lock cam 60 in which the cross-sectional shape of both side walls is formed in a substantially arc shape. When the doors are opened, they are engaged with each other and guided to slide, so that the slide cam member 61 is more reliably guided to a position where it does not deviate from the rotary shaft 58.

FIGS. 30 (a) to 30 (g) show the stopper 40.
FIG. FIG. 30A is a plan view, and FIG.
Is a rear view, FIG. 30 (c) is a front view, and FIG. 30 (d) is FIG.
30 (e) is a left side view, FIG. 30 (f) is a right side view, and FIG. 30 (g) is a gg cross sectional view of FIG. 30 (a). . The stopper 40 is a component which is attached to the slide cam member 61 and has a role of preventing the door from opening more than a certain degree.

FIGS. 31 (a) to 31 (c) are views showing a state where the slide cam member 61, the lock cam member 62 and the stopper 40 are combined. FIG. 31 (a) is a front view,
FIG. 31 (b) is a plan view, and FIG. 31 (c) is a plan view showing a positional relationship of each component when the door is completely opened.
31 (a) and 31 (b), each component has a positional relationship when the door is completely closed.

In FIG. 31A, the slide cam member 61 is attached to a door angle (not shown) provided on the door. The lock cam member 52 is attached to a hinge angle (not shown) provided on the main body. A hinge pin 14 is fixed to the hinge angle. A roller 64 rotatably mounted is provided around the hinge pin 14. Hinge pin 14 and roller 6
4 penetrates through the through hole 57 of the lock cam member 52.

As shown in FIG. 31C, when the door is opened and rotated by, for example, 135 °, the stopper 40 attached to the slide cam member 61 contacts the side surface of the lock cam member 62. As a result, the door stops rotating and is completely opened. In this embodiment, FIG.
As shown in (a), the distal ends 60a, 60b of the lock-out cam 60 provided on the lock cam member 62 are formed by curved surfaces. Also, walls 62a are provided on three sides of the cam 60 outside the lock. These allow the user to lock the cam 60
Touching to prevent injuries. Further, damage to the outer cam 60 due to an external force is prevented.

FIGS. 32 and 33 are a plan view and a front view, respectively, showing an electric mechanism in which the door 20 automatically opens in this embodiment. FIGS. 34 (a) and (b) are side sectional views and side views. is there. In this case, the above-described FIGS.
The configuration is different from that described with reference to FIGS. In these figures, a rotating plate 45 is attached to a chassis 48 provided on the main body 19 so as to be rotatable about a rotating shaft 49. The drive unit 38 attached to the chassis 48
A drive motor 36 is mounted inside. The gear 39 is rotated by the drive motor 36 to rotate the lever 42.

The detection switches 32 and 33 for detecting the operating position of the lever 42 and the standby switch 3 for detecting the standby position
4 is mounted in the drive unit 38. The detection switches 32 and 33 and the standby switch 34 are provided with cutouts provided in the rotating cam 41 linked to the gear 39, so that
Perform N / OFF operation. The roller 26 is rotatably attached to the bracket 51 attached to the door 20 together with the cover 50 by the fixing pin 25.

In FIG. 32, the door 20 is closed, that is, the electric mechanism is in a standby state. At this time, the standby switch 34 is OFF and the detection switches 32, 3
Reference numeral 3 denotes an ON state.

The user operates a touch switch or the like (not shown) provided on the surface of the door 20 or the main body 19, and
When a signal is issued to open 0 from the right side, the gear 39 is rotated leftward by the drive motor 36 as shown in FIG.
The lever 42 is rotated counterclockwise. A roller 44 is rotatably attached to the tip of the lever 42 by a fixing pin 43. As the lever 42 rotates, the roller 44 pushes a groove 46 provided in the rotary plate 45, thereby rotating the rotary plate 45.
Rotates clockwise about the rotation shaft 49.

The right slide surface 47 provided on the rotary plate 45 pushes the right roller 26, thereby causing the door 2 to move.
0 opens a little. At this time, the detection switches 32 and 33 and the standby switch 34 are all ON.

As shown in FIG. 36, when the lever 42 further rotates to the left and the rotary plate 45 rotates to the right, the door 20 is opened to the maximum by this mechanism. At this time, the detection switch 33 is turned off, and the detection switch 32 and the standby switch 34 are turned on. Then, the state returns to the state of FIG. Thereafter, the user manually opens the door 20. When the door 20 is opened from the left side, the above operation is a symmetrical movement.

FIG. 37 shows the structure of an electric circuit of this electric mechanism. Reference numeral 81 denotes a microcomputer, which operates according to a program according to signals from a standby position detection switch SW1, a right operation limit detection switch SW2, a left operation limit detection switch SW3, a right operation input switch SW4, a left operation input switch SW5, and the like. Perform

Reference numeral 83 denotes a motor drive circuit, and reference numeral 85 denotes a motor. Reference numeral 86 denotes a mechanism driven by a motor. The motor 85, the mechanical part 86, and the switches SW1, SW2, and SW3 are the switches and motors shown in FIGS. 19 and 32, 33, 34 (a), and 34 (b) (however, the symbols are different). Corresponding to
In FIG. 37, reference numerals 80, 82 and 84 are power supply connection terminals.

FIG. 38 shows a flowchart of the operation of opening the right side of the door by the microcomputer. First,
When the right operation input switch SW5 is turned on in step # 5, the process proceeds to step # 10 and outputs the right operation signal R.
Thus, the motor drive circuit 83 drives the motor 85 to rotate forward (# 15). This driving continues until the right operation limit switch SW2 is turned off (# 20).

The doors are opened from the right by the operations of steps # 15 and # 20. Next, proceeding to step # 25, the microcomputer 81 outputs the left operation signal L. This causes the motor drive circuit 83 to rotate the motor 85 in the reverse direction. When the standby position detection switch SW1 is turned off in step # 35, the motor drive is stopped (#
40). When opening the left side of the door, the operation is performed according to this operation.

FIGS. 39 (a) and 39 (b) are a plan view and a front sectional view showing one side of a hinge angle 15 provided above a main body (not shown) of the door opening / closing mechanism according to the fifth embodiment. . This embodiment has substantially the same configuration as the third and fourth embodiments.

The hinge angle 15 is made of metal such as stainless steel or galvanized steel plate extending in the width direction of the main body. The right side has a shape obtained by inverting the shape shown in these figures in the left-right direction, and is formed symmetrically. At both ends of the hinge angle 15, a hinge pin 14 serving as a rotation axis of a door (not shown) protrudes downward. At both ends of the hinge angle 15, lock cam members 2 made of a resin molded product, which are arbitrarily symmetrical, are attached at symmetrical positions.

FIG. 40A is a plan view of the lock cam member 2. FIG. FIGS. 40 (b) to (d) respectively show A-
It is A sectional drawing, BB sectional drawing, and CC sectional drawing. The lock cam member 2 is formed from a resin molded product. One end of the lock cam member 2 is provided with a through hole 7 through which a hinge pin 14 is inserted, and the inserted hinge pin 14 serves as a rotation shaft 8 of the door. An arc-shaped second cam projection 6 is formed concentrically with the through hole 7.

The other end of the lock cam member 2 is integrally formed with an outer lock cam 11 having sliding surfaces 11a and 11b which slide with an outer slide cam 9 (see FIG. 43A) described later. I have. The sliding surface 11b further has two sliding surfaces 11c and 11d. The sliding surface 11a and the sliding surface 11d each have a substantially arc-shaped cross section centered on the hinge pins 14 at both ends of the door. The sliding surface is formed in a substantially arc shape in plan view.
A straight line close to the shape in consideration of the gap between the cam 11 and the lock-out cam 11, or a combination of a straight line and a curve may be used.

FIGS. 41A to 41D are views showing the hinge angle 15 disposed below the door. FIG. 41A is a plan view showing one side of the hinge angle 15. FIG.
(B) to (d) are cross-sectional views taken along line AA of FIG.
It is a B sectional view and a CC sectional view. Since the weight of the door and the like are added below the door, the outer lock cam 11 is made of a metal drawn and forged pressed product.

The metal hinge pin 14 and the lock-out cam 11 are fixed to the metal angle member 15a by caulking. The hinge cover 15b is formed by insert molding. Thereby, the lock cam member is formed integrally with the hinge angle 15.

FIGS. 42A to 42C are a top view, a front sectional view, and a bottom view of the door angle 13 disposed above the door, respectively. The door angle 13 has an angle member 13a made of stainless steel or galvanized steel plate on a door cap 13b made of a resin molded product. At both ends of the door angle 13, the slide cam members 1 made of a resin molded product are screwed to the angle members 13a at symmetrical positions, respectively, and clamp the door cap 13b.

FIGS. 43 (a) and 43 (b) are a plan view and a front sectional view of the slide cam member 1, respectively. The slide cam member 1 has a first grooved cam 3 for guiding the engagement with the hinge pin 14 serving as the rotation shaft 8 from the first locking position in a direction to be disengaged, and the hinge pin 14 serving as the rotation shaft 8 from the first locking position. A second grooved cam 4 leading to a functioning second locked state is provided.

The second groove cam 4 has a linear portion 4b and a circular portion 4a.
And When the slide cam member 1 is guided from the first locking position to the second locking position, the linear portion 4b
2 in a plan view of the rear side and the front side of the hinge pin 14
It moves while sliding on a part.

Then, the door rotates at the second locking position where the hinge pin 14 serving as the rotation shaft 8 slides on the circular portion 4a. As described later, when the slide cam member 1 can be slid and guided by the outer slide cam 9 and the outer lock cam 11, the linear portion 4b need not be provided. In the present embodiment, unlike the third embodiment (see FIG. 23 (b)), a second grooved cam 4 is formed so that the slide cam member 1 slides obliquely in the depth direction with respect to the rotation shaft 8. I have.

The slide cam member 1 includes an out-of-lock cam 1.
An outer slide cam 9 having sliding surfaces 9a and 9b that slide with sliding surfaces 11a and 11b of FIG. 1 (see FIG. 40A) is integrally formed. The sliding surface 9b further includes sliding surfaces 9c and 9d.
have. The sliding surface 9a and the sliding surface 9d are each formed in a substantially arc shape common to the sliding surfaces 11a and 11d of the cam 11 outside the lock.

Then, with the rotation of the door, the sliding surface 11a of the outer cam 11 and the sliding surface 9a of the outer cam 9 or the sliding surface 11b and the sliding surface 9b slide to slide the cam. The member 1 is guided. The sliding surface is formed in a substantially arc shape when viewed from above. However, the shape of an arc, a straight line, or a set of a straight line and a curve which is close to the shape taking into account the gap between the outer cam 9 and the outer cam 11 is considered. They may be combined.

FIG. 4 is an enlarged view of the H portion viewed from the back.
4 (a), and FIG. 44 (b) is a sectional view taken along the line AA of FIG. A metal reinforcing member 64 is embedded in the outer slide cam 9. Thereby, the tip 9e of the outer slide cam 9 associated with the slide between the outer lock cam 11 and the outer slide cam 9 is reinforced, and deformation is prevented.
Reference numeral 9j denotes a spacer portion formed on the slide cam member 1, which keeps a proper distance between the door and the main body to prevent deformation of a packing (not shown) disposed behind the door, and at the same time, prevents the packing from sliding outside. The cam 9 is reinforced.

FIGS. 45 to 50 are plan views showing the shift of the relative positions of the lock cam member 2 and the slide cam member 1 when the right side of the door is opened. First, FIG. 45 shows a state where the cam mechanism including the lock cam member 2 and the slide cam member 1 is in the first locking position and the door is completely closed.

At this time, the first grooved cams 3 provided on the left and right slide cam members 1 are formed so as to face diagonally inward of the door, respectively, and are regulated by the hinge pins 14, so that the user can use the first grooved cams. However, even if the door is pulled forward from both sides at the same time, the door does not fall out of the main body.

The gap between the hinge pin 14 and the inner wall surface of the back portion 3a of the first grooved cam 3 on the door center side is formed by the second
A value close to the variation value of the outermost distance L of the groove cam 4 (for example, 1 m
m) is desirable. That is, when the outermost distance L fluctuates due to thermal expansion or the like, the door center side wall surface of the back part 3a on the side where the door is opened hits the hinge pin 14 and hinders movement of the door to the second locking position. Can be prevented.

FIG. 46 shows a state where the door has begun to open from the right side. At this time, the first groove cam 3 provided on the right slide cam member 1 is at a position deviating from the first locking position. FIG. 47 shows a state where the door is further opened from the right side. At this time, the sliding surface 9c of the outer cam 9 slides on the sliding surface 11c of the outer cam 11 on the right side of the door.

The first groove cam 3 guided by the right hinge pin 14 slides the door slightly to the right. Furthermore,
On the left side of the door, the straight portion 4b of the second grooved cam 4 is viewed from above and behind the hinge pin 14 by the hinge pin 14 in a plan view.
The slide cam member 1 is slightly slid in the depth direction while being guided while sliding on the portion.

When the door is further rotated to the state shown in FIG. 48, the circular portion 4a of the second grooved cam 4 is disposed on the left side of the door at a position where it is in sliding contact with the hinge pin 14, and the left slide cam member 1 is in the second engagement position. Stop position. Then, the first cam projection 5
Starts engaging with the second cam projection 6, and the first cam projection 5 is slid and guided. Also, on the right side of the door,
The sliding surface 9d slides on the sliding surface 11d of the outer lock cam 11, and is guided on an arc having the left hinge pin 14 as the rotation shaft 8.

As a result, the slide cam member 1 is locked so as not to come off from the left hinge pin 14, so that the door is prevented from falling off from the main body, and the door can be opened and closed reliably.

Further, when the door is rotated, the inner portion 3a of the right second grooved cam 3 is slidably in contact with the hinge pin 14 or moves with a predetermined gap around the left hinge pin 14 as a rotation axis.
Thereafter, on the right side of the door, the engagement between the hinge pin 14 and the first grooved cam 3 is released. The inner portion 3a of the first grooved cam 3 guides the door by assisting the operation of the outer slide cam 9 and the lock cam 11 when the outer slide cam 9 and the outer lock cam 11 are broken or when there is no outer cam. I do. Thereby, the engagement between the left first cam projection 5 and the second cam projection 6 is facilitated.

Then, as shown in FIGS. 49 and 50, the engagement between the outer lock cam 11 and the outer slide cam 9 of each of the right cam members is released, and the right lock cam member 2 and the slide cam member 1 are disengaged from each other. Is disengaged. On the left side of the door, the sliding surface 9 around the hinge pin 14 (rotary shaft 8)
a and 11a slide, and the outer slide cam 9 is slidably guided by the outer lock cam 11. Thereafter, the slide cam member 1 is guided by the lock cam member 2 only by the engagement between the first cam protrusion 5 and the second cam protrusion 6, and the door is opened.

By the above operation, the rotating outer slide cam 9 abuts on and slides against the outer lock lock cam 11, thereby urging the entire door in the sliding direction. Therefore, the cam mechanism on the shaft side of the door is securely locked in a freely rotatable manner.
This prevents the door from falling off the main body, and allows the door to be opened and closed reliably.

In FIG. 49, a chamfer 9f is provided at the upper end of the slide surface 9b of the outer slide cam 9 in the drawing. Thereby, when closing the door, the outer slide cam 9 is smoothly guided to the outer lock cam 11.
The same effect can be obtained for the chamfer 9h.

If the interval between the left and right second grooved cams 4 becomes large due to an error in assembling, for example, the slide cam member 1 may not reach the position where the hinge pin 14 and the circular portion 4a slide. At this time, since the second grooved cam 4 has the linear portion 4b, the hinge pin 14 is connected to the linear portion 4b.
Can be held. Therefore, the hinge pin 14 is not guided relative to the first groove cam 3 and relatively moves, and the position of the center of rotation of the door is stabilized. Also, the hinge pin 14 is
The danger of the door falling off due to being guided by the groove cam 3 can also be avoided.

At this time, as shown in FIG. 45, when the length M1 of the straight portion 4b in the width direction of the door is made larger than the variation value of the outermost distance L of the second grooved cams 4 at both ends of the door, it is ensured. Since the hinge pin 14 can be held by the second grooved cam 4. The variation value is determined by the mounting error of the slide cam member 1, the processing accuracy of the door angle 13 (see FIG. 42 (a)) for mounting the slide cam member 1, and, in the case of a foam insulated door, the ambient temperature during foaming. It is determined by the fluctuation of the expansion ratio. It is also determined by the thermal expansion of each member constituting the door due to thermal conditions such as an increase in ambient temperature.

When the door opening / closing mechanism of this embodiment was actually mounted on a refrigerator and the displacement caused by a temperature change was measured, when the outermost distance L of the second groove cams 4 at both ends of the door was 650 mm, the ambient temperature was set to Celsius. , The outermost distance L fluctuated by 1 mm. The material of each member is as follows. The slide cam member 1 is made of polyacetal, the door cap 20 is made of ABS resin, the angle member 13a of the door angle 13 is made of galvanized steel plate and has a thickness of 1.2 mm, and the heat insulating portion of the door is made of urethane foam. The foam density is 35 kg / m ³ .

When the outermost distance of the hinge pin 14 of the lower hinge angle 15 is 554.3 mm, when the ambient temperature is changed by 30 degrees Celsius, the outermost distance changes by 0.2 mm. Here, the lower hinge angle 15 has an outer surface coated with ABS resin by insert molding on an angle member (3.2 mm thick galvanized steel plate).

In consideration of the processing accuracy of the door angle 13 and the variation in the mounting accuracy of the slide cam member 1, the above example is not less than 1.3 mm (0.2% of the outermost distance L).
When the linear portion 4b is provided in the groove cam 4, even if the outermost distance L fluctuates, the groove cam 4 is reliably held on the rotating shaft. In addition, the straight portion 4
The plane shape of b may be formed by a curve where the hinge pin 14 contacts at two places.

Since the distance between the two hinge pins 14 is fixed to the hinge angle 15 made of metal, the displacement due to temperature is negligible compared to the slide cam member 1 (for example, in the above example, Celsius). 0.2m at 30 degree change
m), and the processing accuracy and the mounting accuracy of the hinge angle 15 are not so problematic because they can be manufactured with high precision because they are made of metal.

Further, FIG. 51 shows the details of FIG. 49 described above. When the outer slide cam 9 and the outer lock cam 11 are sliding, the center line P2 passing through the center Q0 of the rotating shaft 8 and the lock The radial distance K2 between the contact point Q4 of the outer cam 11 and the center line P3 passing through the center Q0 and the contact point Q3 of the sliding outer cam 11 is defined as the outermost distance L of the second grooved cams 4 at both ends of the door (FIG. 45).
0.2% of the outermost distance L larger than the above fluctuation value
As described above, the outer cam 9 and the outer cam 11 are locked.
Is provided, the slide cam member 1 is reliably held on the rotating shaft 8 even if the outermost distance L fluctuates. this is,
The same applies to the third and fourth embodiments, but a detailed description will be given with reference to the fifth embodiment.

As described above, the first grooved cams 3 and the second
When the interval between the groove cams 4 becomes large due to an error during assembly or the like, the sliding amount of the slide cam member 1 in the width direction decreases. That is, for example, when the right side of the door is opened, the right first groove cam 3 slides on a part of the outer periphery of the hinge pin 14 to move the entire door rightward by a predetermined amount. Is longer than the normal value by the amount of the variation. For this reason, the moving amount of the left slide cam 1 is smaller than the predetermined moving amount in the width direction of the door by the amount of change in the open state of the door. As a result, the outer slide cam 9 may collide with the outer lock cam 11 when the outer slide cam 9 starts sliding.

At this time, as shown in FIG. 52, when the leading end Q1 of the outer slide cam 9 and the leading end Q2 of the outer lock cam 11 are engaged on a straight line P1 parallel to the width direction of the door, the engagement starts.
When the tip Q1 of the outer cam 9 is located on the right side of the tip Q2 of the outer cam 11 in the drawing, the sliding surface 9a is
Will be guided to. Then, the slide cam member 1 is slid substantially to the right in the width direction of the door.

Here, between the slide outer cam 9 and the second groove cam 4 on the same side of the door, and between the lock outer cam 11 and the hinge pin 1
Since the distance between 4 is sufficiently smaller than the outermost distance L, errors relating to the distance can be almost ignored. Furthermore,
If the slide cam member 1 and the outer slide cam 9 and the lock cam member 2 and the outer lock cam 11 are formed of the same material, the error can be further ignored. Therefore, the hinge pins 14 (rotating shaft 8) are slid by sliding the sliding surfaces 9a and 11a.
Is in sliding contact with the circular portion 4a of the second grooved cam 4, the door normally rotates.

For this reason, by making the distance K2 or a distance K1 to be described later larger than the variation value of the outermost distance L of the second grooved cams 4 at both ends of the door, the slide outer cam 9 and the lock outer cam 11
When the engagement starts, the tip Q1 is more reliably arranged on the right side in the figure than the tip Q2, and a collision can be prevented. Therefore, even if the outermost distance L fluctuates by the fluctuation value, the front end Q1 is reliably arranged on the right side of the front end Q2 in the drawing. In addition, FIG.
When the chamfered portion similar to the chamfered portion 5b of the first cam protrusion 5 shown in FIG. 1 is provided on the first cam protrusion 5 of this embodiment, it is clear that the door can be opened more smoothly.

In the above case, even if the second grooved cam 4 does not have the linear portion 4b (sliding contact portion), the slide outer cam 9 can be used.
Is reliably slid with the cam 11 outside the lock,
In the locked position, the hinge pin 14 is connected to the circular portion 4 of the second grooved cam 4.
a, and the door can always be opened smoothly without fluctuation of the rotation axis of the door. Accordingly, there is no need to adjust the mounting position of the slide cam member 1 or replace parts, and it is possible to improve production efficiency and the yield of parts.

The slide cam member 1 and the lock cam member 2 are connected to the door angle 13 (see FIG. 42 (b)) and the hinge angle 15 (see FIG. 39 (a)) by inserting positioning pins (not shown) into a plurality of insertion holes. Inserted and attached.
As described above, the error caused by machining the distance between the outer slide cam 9 and the second groove cam 4 and between the outer lock cam 11 and the hinge pin 14 is sufficiently small with respect to the fluctuation value of the outermost distance L.

However, when the slide cam member 1 and the lock cam member 2 are mounted, it is preferable that one of the insertion holes is formed in a circular shape and the other hole is formed in a long hole, because even if there is an error, the mounting can be easily performed. And the lock cam member 2
The slide cam member 1 has a through-hole 7 serving as a positioning member, and the slide cam member 1 has a second groove cam 4 at or near the center of the rotary shaft 8.
If a positioning pin is provided on the back side of the device, and a fitting hole for fitting the positioning pin is provided in the angle member 13a opposed to the positioning pin, each positioning can be performed more accurately.

Here, the radial distance K between the contacts Q3 and Q4
2 is approximately equal to the distance K1 between the tips Q1 and Q2, and the dimension of the designed distance K1 is that the distance K1 between the tips Q1 and Q2 is the outermost distance L of the second groove cam 4 at both ends of the door (see FIG. 45). Should be set to a value which is larger than the fluctuation value of and is 0.2% or more of the outermost distance L.

Further, as shown in the enlarged view of FIG. 53 (a), the distal end portion 9e of the outer slide cam 9 shown in FIG. 52 has a cylindrical shape having a single radius of curvature R1 in contact with the sliding surfaces 9a, 9c. The position of the tip Q1 can be arranged on the right side in the figure from the sliding surface 9a.

As shown in FIG. 53 (b), the distal end 9e is formed by cylindrical surfaces having different radii of curvature R2 and R3, and the radius of curvature R2 closer to the outer cam 11 is changed to the radius of curvature R3 farther away. It may be larger. With this configuration, the position of the distal end Q1 can be deviated to a side farther from the outer lock cam 11 than when formed with a single radius of curvature R1 shown in FIG. Therefore, the distance K2 (FIG. 51)
This is desirable because it can be larger.

Further, as shown in FIG. 53 (c), it may be formed by a cylindrical surface having different radii of curvature R4 and R5 and a substantially flat surface 9g. The cam 11 outside the lock may be formed so as to have a radius of curvature inverted from the outside cam 9 in the left-right direction.

As shown in FIGS. 45 to 50, when the right side of the door is opened, the left and right sliding outer cams 9 slide rightward in the width direction to lock the outer cams 11.
Slides with. Similarly, when opening the left side of the door, the left and right outer slide cams 9 slide to the left and slide with the outer lock cams 11 in the width direction.

Therefore, when the sliding amount is increased, the distance between the sliding surfaces 9a and 9b of the outer cam 9 can be increased. In this embodiment, if the sliding amount in the width direction of the door is set to 2.5 mm or more, the tip Q1 (see FIG. 52) can be arranged in a direction away from the lock cam 11, and the necessary minimum sliding amount Can always open the door smoothly.

Incidentally, regarding the relationship between the outer slide cam 9 and the outer lock cam 11 when the door is closed, there is a possibility of collision due to the fluctuation value in the same manner as described above, and the chamfered portions 9f and 9h described above.
(See FIG. 49) and the cam 11 outside the lock facing these.
By chamfering or the like, the problem due to the fluctuation value can be avoided.

In FIGS. 53 (a) to 53 (c), the contact between the tip 9e and the sliding surface 9a, and the contact between the tip 9e and the sliding surface 9a are shown.
By setting the distance M from the contact point c to 1.8 mm or more, the reinforcing member 64 (see FIG. 44 (a)) can be attached to the distal end portion, and the strength of the outer slide cam 9 is improved.
The tip shape can be maintained for a long time.

In the present embodiment, as described above, the door on the side opposite to the opening side is not limited to the width direction as in the first to fourth embodiments, but is also slid in the diagonal depth direction. Are formed. In FIGS. 45 and 48 described above, at the first locking position in FIG. 45, the end surface of the slide outer cam 9 is separated from the lock cam member 2 by the distance S1.

As the door rotates, the slide cam member 1 moves in the depth direction and is located at the second locking position. At this time, the slide outer cam 9 moves in the front direction due to the rotation with respect to the hinge pin 14 and moves in the depth direction by the second groove cam 4. As a result, as shown in FIG. 48, at the time of starting the engagement with the outer lock cam 11, the end face of the outer slide cam 9 is separated from the lock cam member 2 by the distance S2, and the distance S1
I'm closer.

That is, at the position of the cam 9 outside the slide,
The outer slide cam 9 can be moved in the depth direction by an amount approaching the lock cam member 2 due to the rotation without danger of the door and the main body coming into contact with each other. Accordingly, the outer slide cam 9 can be lengthened in the depth direction, and the outer slide cam 9 and the outer lock cam 11 can be engaged with each other in a larger rotation range of the door, thereby achieving stable rotation.

FIGS. 54A and 54B are plan views in which packing 65 is provided on the back surface of the door. The packing 65 is pressed against the main body 19 by the sliding of the door in the depth direction.
However, since the packing 65 is formed of a flexible resin (for example, soft polyethylene resin or soft vinyl chloride), the packing 65 has elasticity and can absorb a slide in the depth direction.

When the sliding amount N in the depth direction is smaller than 4% of the distance T1 from the center of rotation of the door to the back surface of the packing 65 which is in close contact with the main body when the door is closed, the pressing force can be absorbed by elasticity. Thereby, it is possible to avoid such a problem that the packing 65 is turned when the door is opened or closed, and a problem that a gap is generated when the door is closed. Note that the position that is the center of rotation of the door and the center of the portion of the packing 65 that is in close contact with the main body in the width direction of the door are set to positions that are close in the width direction of the door.

The slide amount N is set to 2.3% of the distance T1.
If it is larger, the effect of increasing the length of the outer cam 9 in the depth direction is more desirable. When the distance T1 from the center of rotation of the door to the back surface of the packing 65 which is in close contact with the main body in the closed state of the door is 36 mm, and the sliding amount N in the depth direction is 1 mm (2.8% of the distance T1), the packing is 65
The opening / closing operation can be performed easily without peeling, and the length of the outer cam 9 in the depth direction can be increased by about 1 mm as compared with the conventional case.

The above effect can be sufficiently obtained even if the distance T1 is the same as the distance T2 from the center of rotation of the door in the open state to the back of the packing 65.
It may be larger (for example, T1−T2 = 0.5 to
1.5 mm). By providing a magnet in the packing 65, the phenomenon that the packing 65 jumps to and adheres to the main body by the magnetizing force when the door is closed can be used, and the possibility of peeling of the packing is reduced. The door opening / closing operation becomes better.

In the above description, the slide cam member is provided on the door side and the lock cam member is provided on the main body side. However, it is not necessary to be limited to this, and the slide cam member is provided on the main body side. A lock cam member may be provided on the door side.

[0173]

According to the present invention, even if the sliding amount in the width direction of the door fluctuates due to a mounting error of the cam mechanism or thermal expansion, the cam mechanism is smoothly engaged and locked at the second locking position, The door can rotate smoothly.

Further, according to the present invention, since the slide mechanism slides from the first locking position to the second locking position via the sliding contact portion, even when the sliding amount of the door is reduced, the cam mechanism is controlled by the sliding contact portion of the groove cam. It is held by the hinge pin, and the position of the center of rotation of the door is stabilized, and the danger of the door falling off can be avoided. The length of the sliding contact portion in the door width direction is made longer than the fluctuation value of the outermost distance between the two groove cams due to an error at the time of assembling, an error due to a temperature change, and the like. , The cam mechanism is securely held by the hinge pin by the sliding contact portion of the groove cam. As a result, there is no need to adjust the mounting position of the cam mechanism or replace the parts, thereby improving the production efficiency and the yield of parts. By making the length of the sliding contact portion in the door width direction 0.2% or more of the outermost distance of the groove cam, it is possible to easily realize the reliable holding of the cam mechanism by the sliding contact portion of the groove cam. it can.

Further, according to the present invention, the center line passing through the center of rotation of the door and the contact point of the lock outer cam, and the radial distance between the center line and the contact point of the slide outer cam when sliding are arranged on both sides of the door. When the engagement between the outer cam and the outer cam is started, the leading ends of the two cams do not collide with each other. Is done. As a result, there is no need to adjust the mounting position of the cam mechanism or replace the parts, thereby improving the production efficiency and the yield of parts. And by making the radial distance 0.2% or more of the outermost distance of the groove cam,
It can be easily realized so that the slide-out cam and the lock-out cam are reliably arranged at predetermined slidable positions.

According to the present invention, by providing the hinge pins on the metal angle, the distance between the two hinge pins can be accurately formed. Therefore, the collision between the outer slide cam and the outer lock cam can be further reduced.

Further, according to the present invention, the door on the side serving as the rotating shaft is slid in the oblique depth direction, so that the slide-out cam can be lengthened in the depth direction without danger of contact between the door and the main body. As a result, the engagement range between the outer slide cam and the outer lock cam can be increased. Therefore,
Stable rotation can be realized in a larger rotation range of the door. At this time, by setting the distance in the depth direction from 2.3% to 4% of the distance from the center of rotation to the back of the packing, the effect of realizing stable rotation is increased and the packing can be prevented from being turned up. Can maintain confidentiality.

Further, according to the present invention, the tip of the outer slide cam is formed so as to be eccentric to the side away from the outer lock lock rather than having a single radius of curvature, so that the outer slide cam and the outer lock cam are formed. Collision can be further prevented. For this purpose, the tip shape may be formed to have a curved surface having a plurality of radii of curvature to increase the radius of curvature on the side closer to the outer lock cam. Further, by setting the sliding amount in the width direction of the door on the side serving as the rotation axis to 2.5 mm or more, the width of the outer slide cam can be increased, and the top of the outer slide cam is further separated from the outer lock cam. Can be arranged on the side.

Further, according to the present invention, the distance between the center line passing through the center of rotation of the door and the contact of the lock outer cam and the radial distance between the center line and the contact of the slide outer cam when sliding is arranged on both sides of the door. When the engagement between the outer cam and the outer cam is started, the leading ends of the two cams do not collide with each other. Is done. As a result, there is no need to adjust the mounting position of the cam mechanism or replace the parts, thereby improving the production efficiency and the yield of parts. And by making the radial distance 0.2% or more of the outermost distance of the groove cam,
It can be easily realized so that the slide-out cam and the lock-out cam are reliably arranged at predetermined slidable positions.

Further, according to the present invention, when the outer lock cam and the outer slide cam are arranged so as to be in contact with a straight line parallel to the width direction of the door, the contact point between the outer lock and the outer lock cam, By designing the distance between the outer cam and the contact point to be larger than the variation value of the outermost distance of the two groove cams arranged on both sides of the door and manufacturing based on this, the engagement between the slide outer cam and the lock outer cam is achieved. At the start, the tips are reliably arranged in a predetermined slidable position without collision of their ends. As a result, there is no need to adjust the mounting position of the cam mechanism or replace the parts, thereby improving the production efficiency and the yield of parts. The distance in the radial direction is set to 0.
By setting it to 2% or more, it is possible to easily realize that the outer slide cam and the outer lock cam are reliably arranged at predetermined slidable positions.

[Brief description of the drawings]

FIG. 1 is a diagram showing a slide cam member of a door opening and closing mechanism according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a lock cam member of the door opening and closing mechanism according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a state in which a slide cam member and a lock cam of the door opening and closing mechanism according to the first embodiment of the present invention are combined.

FIG. 4 is a diagram showing a movement when the right side of the door of the door opening and closing mechanism according to the first embodiment of the present invention is opened.

FIG. 5 is a view showing a slide cam member of a door opening and closing mechanism according to a second embodiment of the present invention.

FIG. 6 is a view showing a lock cam member of a door opening and closing mechanism according to a second embodiment of the present invention.

FIG. 7 is a view showing a state where a slide cam member and a lock cam of a door opening and closing mechanism according to a second embodiment of the present invention are combined.

FIG. 8 is a view showing the movement of the door opening / closing mechanism according to the second embodiment of the present invention when the right side of the door is opened.

FIG. 9 is a view showing the movement of the door opening and closing mechanism according to the second embodiment of the present invention when the left side of the door is opened.

FIG. 10 is a view showing a state in which a door opening / closing mechanism according to a second embodiment of the present invention is attached to a door and a main body.

FIG. 11 is a diagram showing a lock cam member having another configuration of the door opening / closing mechanism according to the second embodiment of the present invention.

FIG. 12 is a diagram showing a mounting structure of a slide cam member and another lock cam member of the door opening and closing mechanism according to the second embodiment of the present invention.

FIG. 13 is a view showing a state in which a door opening / closing mechanism having another lock cam member according to the second embodiment of the present invention is attached to a door and a main body.

FIG. 14 is a view showing a state where magnets are provided on the door and the main body of the door opening and closing mechanism according to the second embodiment of the present invention.

FIG. 15 is a plan view of a manual door opening / closing device of a door opening / closing mechanism according to a second embodiment of the present invention.

FIG. 16 is a front view of a manual door opening / closing device of a door opening / closing mechanism according to a second embodiment of the present invention.

FIG. 17 is a side view of a manual door opening / closing device of a door opening / closing mechanism according to a second embodiment of the present invention.

18 is a sectional view taken along line aa of FIG.

FIG. 19 is a plan view of an automatic door opening device of a door opening / closing mechanism according to a second embodiment of the present invention.

FIG. 20 is a front view of the automatic door opening device of the door opening / closing mechanism according to the second embodiment of the present invention.

FIG. 21 is a side view of an automatic door opening device of a door opening and closing mechanism according to a second embodiment of the present invention.

FIG. 22 is a view showing the operation of the automatic door opening device of the door opening / closing mechanism according to the second embodiment of the present invention.

FIG. 23 is a diagram showing a slide cam member of the door opening and closing mechanism according to the third embodiment of the present invention.

FIG. 24 is a diagram showing a lock cam member of the door opening and closing mechanism according to the third embodiment of the present invention.

FIG. 25 is a diagram showing a state where a slide cam member and a lock cam of a door opening and closing mechanism according to a third embodiment of the present invention are combined.

FIG. 26 is a diagram showing a mounting structure of a slide cam member and a lock cam member of the door opening and closing mechanism according to the third embodiment of the present invention.

FIG. 27 is a diagram showing the movement of the door opening and closing mechanism according to the third embodiment of the present invention when the right side of the door is opened.

FIG. 28 is a view showing a slide cam member of a door opening and closing mechanism according to a fourth embodiment of the present invention.

FIG. 29 is a view showing a lock cam member of the door opening and closing mechanism according to the fourth embodiment of the present invention.

FIG. 30 is a diagram showing a stopper of the door opening / closing mechanism according to the fourth embodiment of the present invention.

FIG. 31 is a diagram showing a state where a slide cam member and a lock cam of a door opening and closing mechanism according to a fourth embodiment of the present invention are combined.

FIG. 32 is a plan view of an automatic door opening device of a door opening / closing mechanism according to a fourth embodiment of the present invention.

FIG. 33 is a front view of an automatic door opening device of a door opening / closing mechanism according to a fourth embodiment of the present invention.

FIG. 34 is a side view of an automatic door opening device of a door opening / closing mechanism according to a fourth embodiment of the present invention.

FIG. 35 is a diagram illustrating an operation diagram of the automatic door opening device of the door opening and closing mechanism according to the fourth embodiment of the present invention.

FIG. 36 is a diagram illustrating an operation diagram of the automatic door opening device of the door opening / closing mechanism according to the fourth embodiment of the present invention.

FIG. 37 is a circuit configuration diagram showing a configuration of an electric circuit of an automatic door opening device of a door opening and closing mechanism according to a fourth embodiment of the present invention.

FIG. 38 is a flowchart of a control operation of the automatic door opening device of the door opening and closing mechanism according to the fourth embodiment of the present invention.

FIG. 39 is a diagram showing an upper hinge angle of the door opening / closing mechanism according to the fifth embodiment of the present invention.

FIG. 40 is a diagram showing a lock cam member of the door opening and closing mechanism according to the fourth embodiment of the present invention.

FIG. 41 is a diagram showing a lower hinge angle of a door opening / closing mechanism according to a fifth embodiment of the present invention.

FIG. 42 is a diagram showing an upper door angle of a door opening / closing mechanism according to a fifth embodiment of the present invention.

FIG. 43 is a view showing a slide cam member of a door opening and closing mechanism according to a fifth embodiment of the present invention.

FIG. 44 is an enlarged view showing a slide cam member of the door opening and closing mechanism according to the fifth embodiment of the present invention.

FIG. 45 is a view for explaining the operation of the door opening and closing mechanism according to the fifth embodiment of the present invention.

FIG. 46 is a view for explaining the operation of the door opening / closing mechanism according to the fifth embodiment of the present invention.

FIG. 47 is a view for explaining the operation of the door opening and closing mechanism according to the fifth embodiment of the present invention.

FIG. 48 is a view for explaining the operation of the door opening and closing mechanism according to the fifth embodiment of the present invention.

FIG. 49 is a view for explaining the operation of the door opening and closing mechanism according to the fifth embodiment of the present invention.

FIG. 50 illustrates an operation of the door opening and closing mechanism according to the fifth embodiment of the present invention.

FIG. 51 is a diagram illustrating the sliding position of the outer cam and the outer cam of the door opening and closing mechanism according to the fifth embodiment of the present invention;

FIG. 52 is a view for explaining positions of a sliding outer cam and a locking outer cam of a door opening and closing mechanism according to a fifth embodiment of the present invention before sliding;

FIG. 53 is a view for explaining the distal end shape of a slide outer cam of the door opening and closing mechanism according to the fifth embodiment of the present invention.

FIG. 54 is a view showing a state where a packing of the door opening / closing mechanism according to the fifth embodiment of the present invention is attached.

FIG. 55 is a view for explaining the operation of a conventional door opening / closing mechanism.

[Explanation of symbols]

 1, 51, 61 Slide cam member 1a, 2a Outer cam portion 2, 52, 62 Lock cam member 3, 53 First groove cam 4, 54 Second groove cam 5, 55 First cam protrusion 5a Step 6, 56 Second Cam protrusion 7, 57 Through hole 8, 58 Rotation axis 9, 10, 59 Outer slide cam 11, 12, 60 Outer lock 13 Door angle 14 Hinge pin 15 Hinge angle 18 Mounting part 19 Main body 20 Door 25 Fixing pin 26 Roller 28 Slide Plate 36 Motor 35 Pinion 32 (SW3) Left limit detection switch 33 (SW2) Right limit detection switch 34 (SW1) Standby detection switch 36 Motor 39 Gear 42 Lever 44 Roller 45 Rotating plate 64 Reinforcement member 65 Packing 82 Microcomputer 83 Motor drive Circuit 85 Motor SW4 Right operation input Force switch SW5 Left operation input switch

Claims (16)

[Claims] 1. A cam mechanism for engaging and disengaging a door and a main body on both sides of a door is provided, and these cam mechanisms are symmetrical on a first locking position on both sides of the door and also on both sides of the door. In the closed state of the door, both cam mechanisms take the first locked position, and when one of the doors is opened, the door slides and the other cam mechanism is in the second locked position. A door opening / closing mechanism, wherein the other cam mechanism is rotatably locked at the second locking position even when the position of the door slides and the amount by which the door slides varies. 2. A cam mechanism for engaging and disengaging the door and the main body on both sides of the door, wherein the cam mechanisms are symmetrical on a first locking position on both sides of the door and also on both sides of the door. In the closed state of the door, both cam mechanisms take the first locked position, and when one of the doors is opened, the door slides and the other cam mechanism is in the second locked position. A hinge pin, which takes a position and is rotatably locked at the second locking position, forms a rotation axis at the second locking position, and a groove cam which can be relatively moved by engaging with the hinge pin. A door opening / closing mechanism, wherein the groove cam has a sliding contact portion with which a part on the inner side of the hinge pin slides when moving from the first locking position to the second locking position. 3. The sliding door according to claim 2, wherein a length of the sliding contact portion in a door width direction is larger than a variation value of an outermost distance between two groove cams arranged on both sides of the door. Door opening and closing mechanism. 4. The length in the width direction is set to 2 on both sides of the door.
The door opening / closing mechanism according to claim 3, wherein the outermost distance between the two groove cams is 0.2% or more. 5. A cam mechanism having grooved cams for engaging and disengaging the door and the main body on both sides of the door, wherein the cam mechanisms are symmetrical first locking positions on both sides of the door, Symmetrical second locking positions on both sides of the
In the closed state of the door, both cam mechanisms take the first locking position, and when one of the doors is opened, the door slides and the other cam mechanism takes the second locking position and rotates in the second locking position. An outer lock cam, and a slide outer cam that is disposed opposite to the outer lock cam and is slid and guided in an arc shape by the outer lock lock at a second locking position to rotate. A contact point between the lock-out cam at a portion facing the slide-out cam before sliding and a center line passing through the center of rotation of the door on the side that takes the second locking position when the door is opened; The distance between the sliding outer cam of the portion facing the lock outer cam and the center line passing through the center of rotation of the door, and the radial distance when sliding between the two cams arranged on both sides of the door Door opening and closing machine characterized in that it is larger than the fluctuation value of the outermost distance of Structure. 6. A cam mechanism for engaging and disengaging the door and the main body on both sides of the door is provided. These cam mechanisms are symmetrical on a first locking position on both sides of the door and also on both sides of the door. In the closed state of the door, both cam mechanisms take the first locked position, and when one of the doors is opened, the door slides and the other cam mechanism is in the second locked position. A hinge pin, which takes a position and is rotatably locked at the second locking position, forms a rotation axis at the second locking position, and a groove cam which can be relatively moved by engaging with the hinge pin. An outer lock cam provided on the main body and having two sliding surfaces having a substantially arc-shaped cross section centered on the rotation shafts on both sides of the door; and a cross-section substantially provided on the door and centered on the rotation shafts on both sides of the door. It has two arcuate sliding surfaces and is guided by the cam outside the lock. A contact point between a center line passing through a center of rotation of the door and a portion facing the slide outer cam before sliding on a side where the second locking position is taken when the door is opened. The distance between the sliding outer cam and the center line passing through the center of rotation of the door in a portion facing the locking outer cam before sliding, and the radial distance at the time of sliding, are arranged on both sides of the door. A door opening / closing mechanism, wherein a variation value of an outermost distance between the two groove cams is set to be larger than the fluctuation value. 7. The door opening / closing mechanism according to claim 6, wherein the two hinge pins are provided on an angle made of a metal member. 8. The door opening / closing mechanism according to claim 5, wherein the distance in the radial direction is 0.2% or more of the outermost distance of the groove cam. 9. The door opening / closing mechanism according to claim 5, wherein one of the doors is opened and the other is slid in an oblique depth direction. 10. A packing is provided on a back surface of the door, and a sliding amount in a depth direction when the door is opened is set to 2.3% to 4% of a distance between the back surface of the packing and a rotation center. The door opening and closing mechanism according to claim 9. 11. The sliding amount of the door in the width direction is 2.5
11 mm or more.
The door opening and closing mechanism according to any of the above. 12. The outer slide cam has a tip portion including the contact point, which is formed of a curved surface only or a combination of a curved surface and a flat surface, and is provided between two contact points where the tip end portion and the two sliding surfaces are in contact with each other. The door opening / closing mechanism according to any one of claims 4 to 11, wherein the distance is set to 1.8 mm or more. 13. The slide and the slide when the tip of the outer cam including the contact and the tip of the slide outer cam including the contact are arranged in contact with a straight line parallel to the width direction of the main body. The contact point of the outer cam is disposed farther from the lock outer cam than the contact point when the tip portion is formed by a curved surface having a single radius of curvature in contact with the two sliding surfaces. Item 13. The door opening and closing mechanism according to Item 12. 14. The apparatus according to claim 13, wherein the distal end of the outer slide cam has a plurality of radii of curvature, and a radius of curvature closer to the outer lock cam is larger than a radius of curvature farther away. The door opening and closing mechanism as described. 15. A cam mechanism having a groove cam and a hinge pin for engaging and disengaging the door and the main body on both sides of the door, respectively, wherein the cam mechanisms have symmetrical first locking positions on both sides of the door. In the same manner, the symmetrical second locking position can be taken on both sides of the door. When the door is closed, the cam mechanisms on both sides also take the first locking position. The cam mechanism takes a second locking position, and is rotatably locked at the second locking position. A second locking cam is provided by the outer locking cam disposed on the main body and the second locking cam. A sliding outer cam that is slidably guided and rotated in an arcuate position at the position, and wherein the tip of the locking outer cam and the tip of the sliding outer cam are arranged in contact with a straight line parallel to the width direction of the main body. , The straight line, the lock-out cam and the slide-out cam. The design value of the distance between each contact point that contacts the arm is made larger than the variation value of the outermost distance of the two groove cams arranged on both sides of the door, and manufacturing is performed based on the design value. Manufacturing method of door opening and closing mechanism. 16. The method for manufacturing a door opening / closing mechanism according to claim 15, wherein the design value is set to 0.2% or more of the outermost distance between the two cam mechanisms arranged on the door side. .