JPH04327670A - Opening-closing device for double hinged door - Google Patents

Abstract

PURPOSE:To prevent the falling of a door even when a safety device is slipped off by the mischief, etc., of a child, and to close the door by small force. CONSTITUTION:The diameters of the front end sections 302a, 302b of hinge pins 300a, b are made larger than the width of engaging grooves 22a, b. Even when a safety plate 51a is pushed into the door 8 side by mistake while a latch plate 30b is turned in the direction of constraint release and a door 8 is slipped off from the hinge pin 300a, the door is not slipped off from hinge pins on the upper and lower reverse sides, and the door 8 does not fall. Springs 32a, 32b energize latch plates 30a, 30b in the direction of constraint at all times while projecting sections are formed on the latch plates, and an engaging device, which engages the projecting section while being abutted against the front end section 302b of the hinge pin when the door 8 is closed and releasing the engagement of the latch plates, is installed, thus requiring small force for closing the door 8.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening/closing device for a door used in a refrigerator or the like, which can be opened on both the left and right sides.

0002

[Prior Art] Conventional refrigerators, etc. generally have single-swing doors, but recently, in order to meet the diverse needs of users, refrigerators, etc. with doors that can open on both the left and right sides have been offered on the market. It is becoming more and more common. Conventionally, such a double door opening/closing device is shown in FIGS. 10 to 15. As shown in FIG. 10, this opening/closing device consists of upper mounting brackets 2a, 2b fixed to both left and right ends of the front surface of the refrigerator body 1, and hinge pins 3a, 3b provided vertically protruding from the upper mounting brackets 2a, 2b, respectively. The lower mounting brackets 4a, 4b are fixed to the refrigerator main body 1 at a position below the upper mounting brackets 2a, 2b by approximately the height of the door 8, and the lower mounting brackets 4a, 4b are attached upwardly to the lower mounting brackets 4a, 4b, respectively. hinge pins 5a, 5b protruding from the upper mounting brackets 2a, 5b fixed to the inside of the upper part of the door 8;
an upper engaging member that removably engages with the hinge pins 3a, 3b protruding downward from the door 8; It consists of hinge pins 5a and 5b and a lower engagement member that engages with the hinge pins in a detachable manner. Further, the upper part of the door 8 is provided with engagement holes 6a and 6 that engage with the hinge pins 3a and 3b.
b, and the lower part of the door 8 is provided with engagement holes 7a, 7b that engage with the hinge pins 5a, 5b. The upper engaging member has a configuration shown in FIG. 11. Note that since the lower engaging member has a similar configuration, the upper engaging member will be explained below, and the explanation of the lower engaging member will be omitted. This engaging member has grooves 11a and 11b at both ends.
, an engagement groove 12 for engaging the hinge pins 3a, 3b.
A fixing plate 10 to which members 13a and 13b having members 13a and 12b are attached, and pivots 14a, 14b and 1 of this fixing plate 10.
5a, 15b, 16a, 16b, and has engagement grooves 22a, 22b for engaging hinge pins 3a, 3b in engagement grooves 21a, 21b at both ends.
, 23b are attached, and the hinge pins 3a, 3b are rotatably attached to the pivot shafts 14a, 14b provided at both ends of the fixing plate 10, and the hinge pins 3a, 3b are connected to the engagement grooves 12a.
(22a), 12b (22b) Latch plates 30a, 30b having latch grooves 31a, 31b for restraining in (22b), and springs 3 that bias these latch plates 30a, 30b.
2a, 32b, a connecting mechanism 40 that connects the two latch plates 30a, 30b, and safety devices 50a, 5 that restrict rotation of the latch plate on the open side when the door 8 is in the open state.
0b. The connection mechanism 40 includes swing links 41a and 41b swingably attached to pivots 15a and 15b, and a connection link 42 that connects the ends of the swing links 41a and 41b. The swing link 41a (41b) has a slide guide portion 42a.
(42b) and stopper portion 43a (43b).
The lock grooves 44a, 44b engage with the lock pins 33a, 33b protruding from the latch plates 30a, 30b, and the latch plates 3
Rotation of 0a and 30b is restricted. Further, the safety devices 50a, 50b have pivots 16a, 16b.
Safety plates 51a and 51b rotatably attached to the
It is comprised of springs 52a and 52b that urge the safety plates 51a and 51b to protrude toward the main body 1 side. The safety plate 50a (50b) has a substantially L-shaped safety groove 54a (54b) consisting of a slide guide portion 52a (52b) and a stopper portion 53a (53b),
These safety grooves 54a, 54b are the swing links 41a, 41b.
The locking member engages with safety pins 45a and 45b protruding from each other to restrict the swinging of the swinging links 41a and 41b.

FIG. 12 shows the operation of the switchgear constructed as described above.
This will be explained based on FIG. FIG. 12 is a plan view showing the closed state of the door, and FIG. 13 is a plan view showing the open state of the door. The part is shown in (b). Now, from the state where the latch plates 30a, 30b restrain the hinge pins 3a, 3b as shown in FIG. 12, the right side of the door 8 is moved in the direction of arrow A against the force of the spring 32b as shown in FIG. When opened, the latch plate 30b rotates in the restraint releasing direction shown by arrow B, and the lock pin 33b of the latch plate 30b slides through the lock groove 44b of the swing link 41b into the slide guide portion 42.
b, and swings the swinging link 41b in the direction of arrow C. As a result, the safety pin 45b of the swinging link 41b moves to the slide guide portion 52b of the safety groove 54b of the safety plate 51b, and the safety plate Rotate 51b in the direction of arrow D. At this time, the movement of the swing link 41b is transmitted to the swing link 41a on the opposite side by the connecting link 42, the swing link 41a swings in the direction of arrow E, and the lock pin 33a of the latch plate 30a is moved to the swing link 41a. The latch plate 30a is fitted into the stopper portion 43a of the lock groove 44a of the lock groove 41a, thereby restricting the rotation of the latch plate 30a and preventing the latch plate 30a from rotating in the direction of releasing the restraint. Therefore, the door 8 can be rotated around the hinge pin 3a without being detached from the main body 1. Further, due to the swinging of the swinging link 41a, the safety plate 51a swings around the pivot shaft 16a in the direction of arrow F by the force of the spring 52a, and the swinging link 41a
The safety pin 45a of 1a is inserted into the lock groove 54a of the safety plate 51a.
The latch plate 30a is fitted into the stopper portion 53a to restrict the swinging of the swing link 41a and prevent the latch plate 30a from rotating in the direction of releasing the restraint. Therefore, the latch plate 3 on the open side
0b is subjected to some force in the restraining direction (direction opposite to arrow B), and the force is transmitted through swing link 41b and connecting link 42 to swing swing link 41a in the direction opposite to arrow E. However, since the swinging is restricted by the safety device 50a, the swinging link 41a does not swing, and therefore the latch plate 30a does not rotate, and the door 8 does not move toward the main body 1.
It never deviates from it. Also, from the state shown in Figure 12, the door 8
When opening the left side of the door 8, the same operation as above allows the door 8 to be rotated around the hinge pin 3b without being detached from the main body 1. When the door 8 is closed, the latch plate 3 shown in FIG.
0a and 30b are in a state where the hinge pins 3a and 3b are restrained, respectively.

0004

[Problems to be Solved by the Invention] By the way, when the above conventional double door opening/closing device is used, the safety plates 51a and 51b protrude from the door 8 toward the main body 1 side as shown in FIG. 10 when the door is opened. In addition, as shown in the enlarged view of FIG. 15, the latch plate 30a (30
b), but if a child or the like plays a trick when opening this door, the safety plate 51b
(51a) to the door 8 side, and at the same time, engage hole 6a (
When the latch plate 30a (30b) is pushed and rotated with a finger etc. from the opening side, the swing link 41b (41
a) swings, the latch plate 31a (31b) rotates in the restraint release direction, releases the restraint of the hinge pin 3b (3a), and the door 8 easily separates from the main body and falls. The same thing can be said even if the lower engaging member is tampered with. Moreover, as shown in FIG.
When the door 8 is open, the spring 32b (32a
) biases the latch plate 30b (30a) in the direction of releasing the restraint, so when closing the door 8, a force against this biasing force is required, which has the disadvantage that the door 8 is difficult to close. Also, during the period from when the door 8 is opened to when it is completely closed, the latch plate 30b (
There is a point where the force for rotating 30a) becomes 0, and if you stop closing the door 8 at that point, the door 8 will remain half-open, which is a drawback. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a double door opening/closing device that eliminates the above-mentioned problems and drawbacks.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the first invention provides hinge pins protruding from both left and right ends of either the door or the main body to which the door is attached, and at the same time A fixing plate having an engagement groove that detachably engages the hinge pin is provided at the fixing plate, and the left and right ends of the fixing plate are respectively provided with latch grooves that open toward the outer diameter side to detachably engage the hinge pin. At the same time, a latch plate is rotatably attached which is biased by a spring to restrain the hinge pin in the engagement groove, and a latch plate is installed between the two latch plates in conjunction with the rotation of one latch plate in the direction of releasing the restraint. A connecting member for preventing rotation of the latch plate is provided, and the connecting member includes a pair of links pivotally connected to the fixing plate near the left and right latch plates, and a connecting link connecting one ends of these links to each other. A substantially L-shaped locking groove formed by a slide guide portion and a stopper portion is provided on either the latch plate or each link, and the locking groove is engaged with the locking groove on the other of the latch plates or the links. A lock pin is protruding from the latch plate to restrict the rotation of the latch plate, and a safety device is provided to restrict the rotation of the latch plate on the open side when the door is in the open state. It consists of a safety plate pivotally connected to the fixed plate near the above, and a spring that urges the safety plate to protrude toward the door or the main body to which the hinge pin is attached, and each of the links or each of the above A safety groove is provided on one side of the safety plate and is formed in a substantially L shape and includes a slide guide portion and a stopper portion, and the safety groove is engaged with the safety groove on the other side of the safety plate to restrict the swinging of the link. 1. A double door opening/closing device having a protruding pin, the diameter of the tip of the hinge pin being larger than the width of the engagement groove.

[0006] Also, the second invention provides a hinge pin protruding from both left and right ends of either the door or the main body to which the door is attached, and the hinge pin is removably engaged with the other of the hinge pins. A fixing plate having an engagement groove is provided at both left and right ends of the fixing plate, and the fixing plate has latch grooves that are open toward the outer diameter side to releasably engage the hinge pin, and is biased by a spring to cause the hinge pin to be attached to the hinge pin. A latch plate to be restrained is rotatably mounted in the engagement groove, and a connecting member is provided between both latch plates to cooperate with the rotation of one latch plate in the direction of releasing the restraint and prevent rotation of the other latch plate. , this connecting member is composed of a pair of links pivotally attached to the fixing plate near the left and right latch plates, and a connecting link connecting one end of these links, and is connected to each of the latch plates or each of the above. A lock groove formed in a substantially L-shape consisting of a slide guide portion and a stopper portion is provided on either one of the links, and a lock pin that engages with the lock groove and restricts rotation of the latch plate on the other side. A double door opening/closing device formed by projecting a
A spring that biases the latch plate biases the latch plate in the locking direction both when the door is open and closed, and on the open side when the door is in the open state. A locking device is provided for regulating the rotation of the latch plate, and the locking device includes a locking member pivotally connected to the fixing plate near each of the left and right latch plates, and the locking device rotates the locking member in the direction of the engagement groove. a spring that biases the door, a projection is provided on either the links or the latch plate, and the locking member has a locking portion that locks the projection when the door is opened. and the tip of the hinge pin is made thicker than the latch engaging portion with which the latch groove engages, so that when the door is closed, the locking member is pushed by the tip of the hinge pin, and the locking portion is pressed against the locking portion. The latch plate is characterized in that the rotation of the latch plate is released from the rotation by being removed from the protrusion.

[0007]

[Operation] In the first invention, when the door is open,
The safety plate protrudes from the door or main body side, and the latch plate can be directly touched from the outside, so when the door is opened, a child or the like may play a trick and push the safety plate on the closing side into the door or main body side. At the same time, when you press and rotate the latch plate on the open side with your finger, the swing link on the closing side swings, and the latch plate on the closing side rotates in the direction of releasing the restraint, releasing the restraint on the hinge pin and opening the door. However, even if the door detaches from the main body at the hinge pin, the diameter of the tip of the hinge pin on the fulcrum side, which is vertically opposite to where it came off, will be too large for the fixing plate to engage. Since the width is larger than the width of the engagement groove, the hinge pin will not be caught in the engagement groove of the fixed plate and the door will not come off from the main body, thereby preventing the door from falling.

Further, in the second invention, when the door is open, the latch plates on the opening side and the closing side are both urged in the locking direction by the spring, and the locking member on the opening side is not engaged. The stop portion locks a protrusion provided on either the link on the open side or the latch plate to restrict rotation of the latch plate. Next, when you push the door in the direction of closing, before the latch engagement part of the hinge pin on the open side pushes the latch plate on the open side, the tip of the hinge pin first touches the locking member on the open side. The locking member is rotated upon contact. Then, the locking portion of the locking member is disengaged from the protrusion, and the latch plate on the open side becomes rotatable in the locking direction. Then, when the door is pushed further, the latch plate on the open side rotates in the locking direction, the latch groove of the latch plate comes to embrace the latch engagement part of the hinge pin, and a spring urges the latch plate in the locking direction. The force of the door automatically closes without you having to push the door. Therefore, a large force is not required to close the door, and there is no possibility that the door will stop in a half-open state.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below with reference to illustrated embodiments. First Embodiment of the Invention FIGS. 1 to 5 show a double door opening/closing device of this embodiment. This opening/closing device is different from the hinge pin 3a of the conventional opening/closing device.
Instead, a hinge pin 300a with a tip portion 302a thicker than the latch engaging portion 301a is used, and the door 8
An engagement hole 600a for engaging the hinge pin 300a is provided in place of the engagement hole 6a, and the fixed plate 10 is further provided with an engagement hole 600a for engaging the hinge pin 300a.
In place of the member 13a, although not shown, a member having an engagement groove capable of engaging the tip end 302a of the hinge pin 300a is attached, and the structures of the other hinge pins and their engagement parts are also similar to those described above. , the other configurations are the same as the conventional switchgear described above. Identical components are given the same reference numerals and their explanations will be omitted. When the door 8 is closed, as shown in FIG.
Latch engaging portions 301a, 301b of 300b are restrained by latch grooves 31a, 31b of latch plates 30a, 30b, respectively, and engage with engagement grooves 22a, 22b. Tips 302a, 30 of the hinge pins 300a, 300b
The diameter of each of the grooves 2b is larger than the width of the engagement grooves 22a and 22b. This also applies to the bottom of the door. From this state, when the right side of the door 8 is opened in the direction of arrow A as shown in FIG. 41b, safety plates 51b, 51a, and swing link 41a move in the directions of the arrows, and the lock pin 33a of the latch plate 30a fits into the stopper part 43a of the lock groove 44a of the swing link 41a, and the latch plate 30a The door 8 is prevented from rotating in the restraint release direction, and the door 8 rotates around the hinge pin 300a without coming off the main body 1. Further, the safety plate 51a rotates in the direction of arrow F, and the safety pin 45a fits into the stopper portion 53a,
The swinging of the swinging link 41a is restricted, and the latch plate 30a is prevented from rotating in the restraint release direction. If a child or the like plays a trick when this door is opened, the safety plate 51 on the closing side
Push the safety pin 45a into the door 8 side and push the safety pin 45a into the stopper part 5.
3a, and at the same time, use your fingers etc. to press the latch plate 30 on the open side.
When b is pressed and rotated, the swing link 41b and the safety plate 5
1b rotates in directions opposite to arrows C and D, the connecting link 42 is pushed toward the closing side, and the swinging link 41a moves in the direction of arrow E.
The latch plate 30a swings in the opposite direction to the hinge pin 30.
Release the constraint on 0a. Therefore, the door 8 is connected to the hinge pin 3.
Although it can be easily removed from the main body 1 at 00a, for example,
Even if the upper part of the door 8 is detached from the main body 1, the diameter of the tip 502a of the hinge pin 500a is attached to the fixed plate 20 at the fulcrum side vertically opposite to the upper part of the door 8, that is, at the lower hinge pin 500a. Since the width of the engagement groove 22a of the member 23a is larger than that of the door 8,
is locked to the hinge pin 500a and does not come off from the main body 5, and the door 8 does not fall. Moreover, even if the lower part of the door 8 comes off the main body 1, the door 8 is supported by the upper hinge pin, so the door 8 will not fall. Therefore, it is safe for children to avoid being injured.

Second Embodiment of the Invention FIGS. 6 to 9 show a double door opening/closing device according to this embodiment. The structure of the hinge pin and the engaging portion of the hinge pin of this opening/closing device is the same as in the embodiment of the first invention. Also,
The structure of the engaging member is as shown in FIG. This engaging member differs from the conventional example shown in FIG. 11 in the following points. That is, in the conventional example, the springs 32a and 32b that bias the latch plates 30a and 30b are biased in the restraining direction when the latch plates are closed, and biased in the restraining release direction when the latch plates are opened. On the other hand, in this embodiment, as shown in FIG. 7, the force is applied in the restraining direction both when closing and when opening. And the latch plate 30
A locking device 400 that is provided with protrusions 34a, 34b on a, 30b, and locks the protrusions 34a, 34b when the door 8 is opened to restrict rotation of the latch plates 30a, 30b.
a and 400b are provided. This locking device 400a is
A locking member 402a is rotatably attached to the pivot shaft 17a of the fixed plate 10 near the latch plate 30a and has a locking portion 401a that locks the protrusion 34a. Spring 403 that biases toward the side
It consists of a. Similarly, the locking device 400b includes a locking member 402b having a locking portion 401b and a spring 403b. The rest of the structure is the same as the conventional switchgear described above, and the same components are given the same reference numerals and explanations will be omitted. Note that this opening/closing device also has a safety device similar to the safety devices 50a and 50b in the conventional example, but the description thereof will be omitted. The operation of the opening/closing device having the above configuration will be explained based on FIGS. 7 to 9. Door 8 shown in Figure 7
In the open state, the latch plates 30 on the closing side and the opening side
a and 30b are both biased in the locking direction by springs 32a and 32b, and the locking member 4 on the open side
The locking part 401b of 02b is the protrusion 34 of the latch plate 30b.
b is locked to restrict rotation of the latch plate 30b. When the door 8 is closed from this state, as shown in FIG.
The locking member 402b is located at the tip 302 of the hinge pin 300b.
b, the locking portion 401b engages with the protrusion 34b.
The latch plate 30b becomes rotatable in the locking direction. When the door 8 is further pushed, the latch plate 30b rotates in the locking direction due to the force of the spring 32b, and the latch groove 31
b comes to embrace the latch engaging portion 301b of the hinge pin 300b, and the door 8 can be automatically closed without having to push the door 8. FIG. 9 shows the closed state, with the latch plate 30
a, 30b are biased in the restraining direction by springs 32a, 32b, respectively, and hinge pins 300a, 300b
is restrained. Further, the locking members 402a, 402
b are urged toward the engagement grooves 22a and 22b by springs 403a and 403b, respectively, but the locking portion 40
1a and 401b are locked to the projections 34a and 34b, so when the door 8 is opened, the locking members 402a and 402b are locked.
are the tips 302a, 3 of the hinge pins 300a, 300b.
The door 8 can be opened easily without hitting the door 02b. In this way, since the springs 32a and 32b always bias the latch plates 30a and 30b toward the restraint side not only when closing but also when opening, only a small force is required when closing the door 8. Furthermore, the door 8 is never left half-open. Further, as in the embodiment of the first invention, since the diameter of the tips 302a, 302b of the hinge pins 300a, 300b is larger than the groove width of the engagement grooves 22a, 22b, it is possible to prevent the door from being damaged by children or other mischief. 8 will not come off from the main body 1 and fall.

In both the embodiment of the first invention and the embodiment of the second invention, the hinge pin is provided on the main body and the engaging member is provided on the door side, but the hinge pin is provided on the door side and the engaging member is provided on the main body. It may also be provided on the side.

0012

Effects of the Invention As is clear from the above, the opening/closing device for a double door according to the first aspect of the invention has the following advantages: The diameter is made larger than the width of the engagement groove that engages the hinge pin, which is provided at both left and right ends of the fixed plate fixed to either the door or the main body, so that when the door is opened, the hinge pin is Even if the restraint of the latch plate that is restrained in the engagement groove and the restriction by the safety device that restricts the rotation of this latch plate are released by a child or other mischief, and the door comes off from the main body on the release side. In the engagement portion on the vertically opposite side to the release side, the hinge pin will not come off the engagement groove, and therefore the door will not fall from the main body, making it very safe.

[0013] Furthermore, in the double door opening/closing device of the second invention, hinge pins protruding from both left and right ends of either the door or the main body to which the door is attached are attached to the other of the door or the main body. A spring that biases the latch plate for restraining in the engagement grooves provided at both left and right ends of the fixed fixing plate moves the latch plate in the restraining direction both when the door is opened and when the door is closed. In addition, a locking device is provided to restrict the rotation of the latch plate on the open side when the door is in the open state, and the locking device is located near each of the left and right latch plates. It consists of a locking member pivotally connected to the fixed plate and a spring that biases the locking member in the direction of the engagement groove, and a protrusion is provided on either one of the links or the latch plates. , the locking member is provided with a locking portion that locks the protrusion when the door is opened, and the tip of the hinge pin is made thicker than the latch engagement portion with which the latch groove engages, so that the door is closed. When the door is closed, the locking member is pushed by the tip of the hinge pin, causing the locking portion to disengage from the protrusion and release the restriction on the rotation of the latch plate. It only requires force, and there is no need for the door to stop in a half-open state.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a state in which a door is attached in an embodiment of the first invention.

FIG. 2 is a plan view showing the door in the closed state in the above embodiment.

FIG. 3 is a plan view showing an open state of the door in the above embodiment.

FIG. 4 is a front view of the hinge pin in the above embodiment.

FIG. 5 is a front view showing the engagement portion with the hinge pin in the above embodiment.

FIG. 6 is an exploded perspective view of an engagement member according to an embodiment of the second invention.

FIG. 7 is a plan view showing an open state of the door in the above embodiment.

FIG. 8 is a plan view showing a state in the middle of closing the door in the above embodiment.

FIG. 9 is a plan view showing the door in the closed state in the above embodiment.

FIG. 10 is a perspective view showing a state in which a door is attached in a conventional example.

FIG. 11 is an exploded perspective view of the above-mentioned conventional engagement member.

FIG. 12 is a plan view showing a closed state of the door in the conventional example.

FIG. 13 is a plan view showing an open state of the door in the conventional example.

FIG. 14 is a front view of the hinge pin in the conventional example.

FIG. 15 is a front view showing the engagement portion with the hinge pin in the conventional example.

[Explanation of symbols]

1...Refrigerator body, 8...Door, 10, 20...Fixing plate, 22a
, 22b...Engagement groove, 30a, 30b...Latch plate, 31a
, 31b...Latch groove, 32a, 32b...Spring, 3
4a, 34b...Protrusion, 41a, 41b...Link, 42
...Connection link, 51a, 51b...Safety plate, 52a, 52
b...Spring, 300a, 300b...Hinge pin, 3
01a, 301b...Latch engaging portion, 302a, 302b
...Tip portion, 400a, 400b...Locking device, 401a,
401b...locking part, 402a, 402b...locking member, 4
03a, 403b...Spring, 600a, 600b...
engagement hole.

Claims (2)

[Claims] Claim 1: A fixing having hinge pins protruding from both left and right ends of either the door or the main body to which the door is attached, and an engagement groove in which the hinge pin is removably engaged on the other side. A plate is provided at both left and right ends of the fixing plate, and the hinge pin is removably engaged with the hinge pin through latch grooves that open toward the outer diameter side, and is biased by a spring to restrain the hinge pin in the engagement groove. A latch plate is rotatably attached to the latch plate, and a connecting member is provided between these two latch plates to prevent rotation of the other latch plate in conjunction with the rotation of one latch plate in the direction of releasing the restraint, and this connecting member is configured as described above. Consisting of a pair of links pivotally attached to the fixed plate near the left and right latch plates, and a connecting link that connects one end of these links to each other, the latch plate or each link is attached to either one of the latch plates or the links. A lock groove formed in a substantially L-shape consisting of a slide guide portion and a stopper portion is provided, and a lock pin is provided protruding from one of the lock grooves to engage with the lock groove to restrict rotation of the latch plate. A safety device is provided to restrict the rotation of the latch plate on the open side when the door is in the open state, and this safety device includes a safety plate pivoted to the fixed plate near each of the left and right latch plates, and this safety plate. The door is attached to the hinge pin, or the spring is biased to protrude toward the main body. A double door opening/closing device comprising a safety groove formed in the shape of a letter, and a safety pin protruding from one of the grooves to engage with the safety groove to restrict swinging of the link, the device comprising: A double door opening/closing device characterized in that the diameter of the tip of the hinge pin is larger than the width of the engagement groove. 2. A fixing having hinge pins protruding from both left and right ends of either the door or the main body to which the door is attached, and an engagement groove for detachably engaging the hinge pin on the other side. A plate is provided at both left and right ends of the fixing plate, and the hinge pin is removably engaged with the hinge pin through latch grooves that open toward the outer diameter side, and is biased by a spring to restrain the hinge pin in the engagement groove. A latch plate is rotatably attached to the latch plate, and a connecting member is provided between these two latch plates to prevent rotation of the other latch plate in conjunction with the rotation of one latch plate in the direction of releasing the restraint, and this connecting member is configured as described above. Consisting of a pair of links pivotally attached to the fixed plate near the left and right latch plates, and a connecting link that connects one end of these links to each other, the latch plate or each link is attached to either one of the latch plates or the links. A lock groove formed in a substantially L-shape consisting of a slide guide part and a stopper part is provided, and a lock pin protruding from one of the lock grooves engages with the lock groove to restrict rotation of the latch plate. A double door opening/closing device, wherein a spring that biases the latch plate biases the latch plate in a restraining direction both when the door is opened and when the door is closed; A locking device is provided to restrict the rotation of the latch plate on the open side when the latch plate is in the open state, and the locking device includes a locking member pivotally connected to the fixed plate near each of the left and right latch plates, and this locking device. The locking member is configured with a spring that biases in the direction of the engagement groove, and a protrusion is provided on either one of the links or the latch plates, and
The locking member is provided with a locking portion that locks the protrusion when the door is opened, and the tip of the hinge pin is made thicker than the latch engagement portion with which the latch groove engages, thereby closing the door. An opening/closing device for a double door, characterized in that when the locking member is pushed by the tip of the hinge pin, the locking portion is disengaged from the protrusion and the restriction on rotation of the latch plate is released.