JPH0953356A - Lock for double wing door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a door from being opened in an earthquake by mounting a latch bar releasing device having a releasing knob and a two-stage pulley on the reverse side of a double wing door, and making an ordinarily locked type latch releasable with a small stroke. SOLUTION: A device in which a release knob 21 and a two-stage pulley 23 formed of a small pulley 22 and a large pulley 24 are united by a protecting case 2 is mounted on the reverse side of the double wing door of a cupboard or the like, and connected to an ordinarily locked type latch bar 41 by a wire 3. When the release knob 21 or release button is pushed down in the general opening and closing of the door, the two-stage pulley 23 is rotated to largely move the latch bar 41 with a small stroke, so that it can be released from a latch receiver 5 to easily open and close the door. Since the latch bar 41 is ordinarily closed, the door is never opened even in earthquake. The latch bar 41 may be of ordinarily opened type which is closed only at earthquake. Thus, a cupboard never opened in earthquake can be easily provided without losing the appearance and interior property of the cupboard.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door lock mechanism for a double door of a cupboard or the like, which prevents the door from being opened unexpectedly due to the vibration of the earthquake and the stored dishes and the like from popping out and falling. Regarding improvement.

[0002]

2. Description of the Related Art Most of the cupboard doors on the market in the past are mostly double doors, and most of the door cabinets and the doors are fixed by the attraction force of a permanent magnet. Therefore, when a large earthquake occurs, the vibrations cause the stacked tableware to collapse all at once, hitting from the inside of the door, and the magnetic force that fixes the door makes it unbearable.As a result of the door being pushed open, the tableware falls, It was damaged and very dangerous for disaster prevention.

As an ideal disaster prevention measure, a commercially available indoor pillar, fixing to a crosspiece, etc. using a metal fitting, use of a fall-prevention auxiliary device for tensioning to the ceiling, tilting the cabinet etc. to the wall side and moving the center of gravity backward It is important to take measures to prevent the furniture from falling over, such as using a distorted triangular plate spacer. Next, it is important to attach a commercially available glass anti-scattering sheet to the glass of the door in order to prevent the tableware from jumping out of the cabinet even if the glass hits the glass and the glass breaks. Finally, it can be said that it is a perfect earthquake countermeasure if a lock is installed to prevent the door from being pushed open in the event of an earthquake, but in the past, there was no mechanism that locks the door exclusively for double doors. It was

Conventionally, in order to meet this requirement, the existing metal fittings such as (a) hook type latch 51 and (b) inner hook 52 shown in FIG. The first problem is that the hook-type latch 51 and the hook 52 are all external structures, and as furniture, the interior quality and aesthetics of the cabinet are remarkably impaired, and it is difficult to attach them emotionally. The second problem is that the door opening / closing operation is not a one-touch operation. That is, since these metal fittings are attached to a place different from the handle, each time the door is opened, the hook-type latch 51 and the hitting knob 521 are released, and then the handle is a two-stage operation to pull the handle as another operation. Locking and unlocking metal fittings is a chore in daily housework, and there is concern that forgetting to lock the metal fittings will make it useless in the event of an earthquake.

On the other hand, FIG. 13 (a) is a perspective view of an example of a door lock mechanism of a double door office locker viewed from the back side with the door open, and FIG. 13 (b) is a front perspective view of the office locker. . The lock mechanism is such that the rod bar 27 penetrates to the upper plate 12 and the bottom plate (not shown) in the longitudinal direction of the door 1 and is interlocked with the handle 13 of the door. Put your hand on the handle of the door and pull it with the fingers other than the thumb and pull it toward you.
Rotates 1/4 turn, the fitting portion 9 attached to the tip of the rod bar is released from the rocker body, and the door opens.

The mechanism in this case is always locked when the door is not opened, and it is preferable for safety to divert it to a cupboard or the like, but because of the structure, the thickness L1 of the door 1 is usually required to be 40 to 50 mm. The thickness of the cupboard door is 20-30
There is a problem that this mechanism cannot be physically incorporated into the door because it is as thin as about mm.

[0007]

SUMMARY OF THE INVENTION Assuming a wooden double door cupboard, it is necessary to solve the following problems in order to deal with the above problems.

First, when the door lock mechanism is attached, the consumer's willingness to purchase can be obtained without impairing the aesthetics, interior design and image of the cupboard as furniture.

Secondly, the lock is not forgotten, and the fail-safe concept is incorporated in the operation, and the door should always be in a locked state, and there is certainty against an earthquake.

Thirdly, it is possible to open / close the lock with one touch or not, and by installing the lock mechanism, opening / closing of the door is not troublesome and operation is not burdened.

Fourthly, in the production of the lock mechanism, mass production is possible without developing a large-scale production facility of its own, and it can be manufactured at low cost and is easy for consumers to purchase.

Fifth, the structure of the lock mechanism is simple and free from failure. For that reason, an electromagnet or the like is not used in the lock mechanism, and the power supply and its peripheral circuits are not required.

The sixth feature is that the lock mechanism can be easily attached to a closet, and can be attached to any double-door double-sided door cabinet as much as possible.

Seventh, the lock mechanism of the present invention is made as thin as possible (small size), and the storage space of the closet is not pressed by mounting the lock mechanism.

In summary, the object of the present invention is to solve all of the problems described above and to newly provide a door lock exclusively for double doors that has never existed in the past.

[Means for Solving the Problems]

In order to achieve the above object, the present invention takes the following measures. That is, the greatest feature of the present invention is that although it is a retrofit, the lock mechanism main body is installed inside the cabinet, and the lock release button is previously integrated with the handle of the door of the cabinet or the mechanism itself is unnecessary. .
For the former, attach a thin lock mechanism to the back side of the door and attach the lock release button so that it slightly protrudes on the side surface between both doors near the handle part, or install it in the handle part that is usually counterbored did. On the other hand, the latter has a structure in which a lock mechanism equipped with a seismic device is installed on the cabinet main body side so that the lock operates inside the cabinet only when an earthquake occurs. Stored on the side of the top of the door.

The contents of these contents are not conspicuous because the lock mechanism main body is attached to the inside of the closet, and the lock release button is not necessary when the lock release button is integrated with the handle or when the door is normally opened and closed. The door can be opened with one touch, and the opening and closing operation of the door is considered ergonomically, and it is possible to have a structure that does not forget to lock the door physically.

[Action]

As described above, the present invention is characterized in that even if the lock mechanism is attached to the closet, the appearance is not impaired. However, in the constant lock type, the lock mechanism is configured and released in a limited space. In order to make the stroke of the button as small as possible, the mechanism is devised by using "shift by two-stage pulley" or "lever principle". In addition, the operation type when an earthquake occurs uses an iron ball for the seismic sensing device,
When the iron ball falls due to the shaking of the earthquake, the stopper bar of the hook metal comes off and the lock is applied from the inside of the cabinet.

【Example】

An embodiment of the present invention will be described with reference to FIGS. 1, 2 and 3. FIG. 1 (a) is a perspective view showing the outline of a double door lock according to the present invention, as viewed from the back side with the door opened. In FIG. 1A, 1 is a door of a cabinet, 10 is a wooden holding frame (a crosspiece) for holding a glass 11, a protective case 2 is a main part of a double door lock of the present invention, and a consumer uses this unit. Attach to the back of the door with a few wood screws (not shown). Also, a latch 4 is attached to the upper part on the back side of the door and a wire wire 3 extending from the unit 2 is connected to a latch rod 41, while a latch receiver 5 (not shown) is attached to the main body of the cabinet according to the position of the latch 4. ) Completes the installation of the double door lock of the present invention.

In FIG. 1A, the main part unitized by the protective case 2 is a release knob 21 and a small pulley 2.
It comprises a two-step two-stage pulley 23, a large pulley 24, a pulley belt 25, a release knob mounting slide rail 26, and a wire wire 3 connecting the pulley belt 25 and the latch rod 41.

FIG. 1 (b) is a front view of the armrest handle, and the handle 13 is often counterbored. When the lock for a double door according to the present invention is attached to a closet,
As shown in FIG. 1B, only the release knob 21 can be seen between both doors, and the lock body is hidden inside the closet so that it cannot be seen in appearance.

FIG. 2 is a side view of the double door lock of the present invention shown in FIG. 1 as seen from the direction of the arrow. Normally, when the door is closed, the latch 4 is fitted with the latch receiver 5, so that the door is always locked. A point to be noted structurally is that the release knob 21 is installed between both doors, that is, on the side surface of the door 1. In the lock releasing mechanism according to the present embodiment, when the handle 13 is held and the release knob 21 is pushed down with the thumb, the wire wire 3, the small pulley 22, the two-stage pulley 23, and the large pulley 2 extending from the release knob root portion 211.
4, the force is transmitted to the latch rod 41 via the wire wire 3, and the latch rod is pulled out from the latch receiver 5 by pulling down the latch rod 41. This enables unlocking and pulling the door toward you with one touch. Further, as shown in FIG. 2, the thickness L2 of the protective case 2 is thinner than the thickness of the door 1 to save space.

On the other hand, in order to close the door without pressing the release button, as an example, FIG.
The latch receiver 5 shown in (a) and (b) is used. That is, the case of FIG. 3 (a) is an improvement of the roller catch (trademark) that is generally commercially available. The tip 52 for receiving the latch rod 41 has a comb shape, and is from the arrow a side (direction to close the door). Although the latch rod 41 is inserted, the comb-shaped portion 52 at the tip serves as a stopper on the arrow b side (the direction in which the door is opened) so that the latch rod cannot be pulled out.

Further, in the case of FIG. 3B, the ring 53 attached to the latch receiving tip portion 52 has a structure in which only the inner side is bent by the spring force as shown by an arrow c, and when the latch rod 41 hits the ring 53, the ring 53 Is a mechanism that pushes and bends to lock the latch bar. In this case, since the mounting portion of the ring 53 is non-linear, when the latch rod hits the ring, the force may not be evenly applied and the latch receiver may be twisted. Therefore, the spring 42 is inserted in the middle of the latch rod so that the latch rod itself can be slightly moved when the latch rod hits the ring.

FIG. 4 is a perspective view showing the detailed structure of the main part of the double door lock of the present invention. The release knob 21 is directly attached to the slide rail 26 with a built-in bearing in order to install it on the side surface of the door. The release knob 21 has a thickness of 1 m.
Although it is about m, the distance between both doors of the closet is usually about 5 mm, and the dimension between the left and right doors can be adjusted slightly with the adjusting screw of the door butterfly plate, so if the release knob is about 1 mm thick, both doors There is no problem even if it is installed in the space (on the side of the door).

On the other hand, if the release knob is pushed down in the direction of the arrow as shown in FIG. 4, a twisting force is applied to the release knob base portion 211 with respect to the release knob length of 2, which may make it difficult for the release knob to slide smoothly. Release knob It is necessary to increase the rigidity of the root part. In the embodiment, 2 is assumed to have a door thickness of 30 mm, and 3 is 20 mm to provide rigidity. In particular, the knob thickness is located in the gap between the cabinet and the door, so there is a constraint that the thickness cannot be large. Metal is used for the material of the knob.

The wire portion 3 is attached to the root portion 211 of the release knob and is connected to the pulley belt 25.
Along the way, the pulley is a two-stage pulley in which a small diameter and a large diameter are combined to enable shifting, that is, the pulling length of the latch rod 41 is increased depending on the ratio of the pulley diameters even if the stroke of the release button is small. There is.

As described above, in the embodiment of the present invention, in order to solve the above-mentioned problems, the lock release button is integrated with the handle and the stroke of the release button is shortened by the "two-stage pulley". It can be said that the application that focuses on "shifting" is new to the conventional door lock mechanism.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIGS. FIG. 5 (a) is a perspective view showing the outline of the double door lock according to the second embodiment of the present invention, as viewed from the back side with the door opened. Also in FIG.
FIG. 5B is a front view of the armrest handle, and FIG. 5B is a view when the door lock according to the present invention is attached to the armchair.
As described above, the release button 21 can be seen only inside the counterbore-handled handle, and the lock body cannot be seen from the outside because it is attached and hidden inside the closet. Especially in some cupboards, when the counterbore of the handle is viewed from the front of the cabinet, there is an overhanging recess, and in this case the release button is hidden in the overhanging part, so a book lock is attached later. Even without losing the aesthetics and image of the closet.

The meanings of symbols omitted in FIG. 5 (a) are the same as those in FIG. 1, and the protective case 2 is the main part of the double door lock of the present invention, and the consumer uses this unit with several wood screws ( (Not shown) Installed on the back side of the door. A latch 4 is attached to the upper part on the back side of the door and a wire wire 3 extending from the unit 2 is connected to a latch rod 41, while a latch receiver 5 (not shown) is attached to the main body of the cabinet according to the position of the latch 4. ) Is completed, the installation of the double door lock of the present invention is completed.

The point different from the first embodiment is that the lock release button is provided inside the countersunk handle, and in particular, it is countersunk on the consumer side in a cabinet where the handle is overhanging. If you can make a long hole (about φ3 x 6 mm) for attaching the lock release button inside the handle, the release button will also be hidden when seen from the front as described above. Better than case 1.

In FIG. 5A, the main parts unitized by the protective case 2 are a release button 21, a small pulley 22,
It is composed of a rod rod 27 and a wire wire 3 connecting the rod rod and the latch rod.

FIG. 6 is a side view of the double door lock according to the second embodiment of the present invention shown in FIG. 5, viewed from the direction of the arrow. As in the first case, in this case as well, when the door is normally closed, the latch 4 is fitted with the latch receiver 5, and thus is in a state of being always locked. Further, the thickness L2 of the protective case 2 is thinner than the thickness of the door 1, and space saving is achieved. In the lock releasing mechanism according to the present embodiment, a long hole of about φ3 × 6 mm is made in the countersunk handle 13 and the release button 21 projected from the release button connecting shaft 28 is pushed to move the rod. Stick 27
Is transmitted to the wire 3 and pulls the latch rod 41,
The latch rod 41 is detached from the latch receiver 5, and the door is opened.

As the operation for opening the door, the handle 13 is put on and the lock is released by pushing the release button 21 with the forefinger, so that the lock can be released and the door can be released with one touch like the first embodiment. I am trying. Also, when the door is closed, it is possible to close the door without pressing the release button by using the latch receiver shown in FIG.

FIG. 7 is a second part of the double door lock of the present invention.
3 is a perspective view showing the operating principle of the embodiment of FIG. When the release button 21 attached to the tip 271 of the rod rod 27 is pushed in the direction of arrow a, the rod rod 27 moves in the direction of arrow b around the fulcrum 273 based on the principle of leverage. Further, the closer the rod fulcrum 273 is to the release button 21, the smaller the stroke 1 at the tip 271 and the larger stroke 2 at the opposite side 272.

As an example, the design value of stroke 1 is 3 m
m, the length L2 of the rod rod 27 is 300 mm, and the tip 27
If the length 3 from 1 to the fulcrum 273 is 30 mm, the stroke 2 is about 20 mm. This length is rod rod 2
The wire wire 3 attached to the opposite side 272 of 7 is transmitted through the small pulley 22 and has a length sufficient to pull out the latch rod 41 from the latch receiver 5 (not shown).

Further, the force for pulling the latch rod 41 in the direction of arrow c is the length 3 from the tip 271 of the rod rod 27 to the fulcrum 273, the moment of the force pushing the release button 21 in the direction of arrow a, and the latch 4. It is determined by the difference between the compression force of the spring 43 incorporated therein.

FIG. 8 is a perspective view showing a method of attaching the release button to be installed on the handle portion of the door. As a pre-operation for attaching the release button, an elongated hole 14 of about φ3 × 6 mm is formed in the countersunk handle portion 13 in order to penetrate the release button connection shaft 28. Next, the release button connection shaft 28 is screwed into the release button connection shaft screw hole 281 provided at the tip 271 of the rod rod, and the protective case 21 is aligned with the elongated hole 14 from the back side of the cabinet and several wood screws are attached. (Not shown)
Secure it to the back of the door with. From the front of the door, release button 21
The release button on the connecting shaft 28, and fix the screw 282
Tighten the screws to complete the assembly.

As described above, in the present invention, in order to solve the above-mentioned problems, the lock release button is integrated with the handle,
Moreover, it can be said that the novel feature that the conventional locking mechanism for the double door does not have is that the lever mechanism is applied to reduce the stroke of the release button and make the transmission mechanism compact.

Further, a third embodiment of the present invention will be described with reference to FIGS. 9, 10 and 11. FIG. 9 is a front perspective view in which the double door lock of the third embodiment of the present invention is attached to a cupboard. In the case of the present invention, the lock unit 6 equipped with the vibration-sensing device is fixed to the top plate 12 of the cabinet with several wood screws (not shown). Further, on the door 1 side, a receiving metal fitting 8 that fits with the hooking metal fitting 7 of the lock body is fixed with several wood screws (not shown).

The third embodiment is similar to the first and second embodiments in that the lock unit main body is installed inside the cabinet and the release button is inconspicuous in appearance. In contrast to the second embodiment, which is always locked, the third embodiment
The embodiment is different from the embodiment in that it is actuated only when an earthquake occurs.
In the third embodiment, the lock release button (knob) for releasing the door is not necessary because it is not always locked. That is, in the first and second embodiments, the unlocking operation can be performed with one touch by integrating the unlocking button and the handle of the cabinet.
If even pressing the lock release button is troublesome, the third embodiment can be recommended. Further, in the first embodiment, since the dust intrusion prevention plate is provided on one side of the door, the lock unit cannot be attached unless the release knob 21 is deformed.
The application of the third example is effective in the case where there is a feeling of resistance to opening the through hole of the release button connecting shaft 28 in the furniture in the second embodiment.

FIG. 10 is a perspective view of the details of the receiving metal fitting 8 attached to the door side as seen from the back side when the door is opened. The convex receiving metal fitting 8 that fits with the hooking metal fitting 7 is fixed to the door via a concave rail 81, and the receiving metal fitting 8 has a string 8 attached thereto.
2 is attached, and the tip of the string 82 is temporarily fixed to the side surface of the door 1 with the adhesive tape 83. When an earthquake occurs, the lock operates inside the cabinet, so to unlock it, pull the string 83 out of the gap between both doors when the door is closed, and pull it to pull the bracket 8 into the bracket rail 8.
Since it comes off from 1, the hook metal fitting (not shown) 7 of the lock body becomes free and the lock is released. Further, in order to prevent the convex receiving metal fitting 8 from coming off from the concave metal fitting rail 81 due to the vibration of the normal door opening and closing, an embossing 811 for a stopper is formed near the end surface of the metal fitting rail 81.

11 (a) and 11 (b) are front perspective views showing the main part of the double door lock unit main body of the third embodiment of the present invention. FIG. 11 (a) shows a normal use state of the lock unit, and FIG. 11 (b) shows a state in which the lock unit is fitted to the receiving metal fitting 8 attached to the operation door side due to an earthquake.

The operating principle of this lock unit is that the sensitivity adjusting rod 65 projects from the bottom of the mortar-shaped weight 62.
An iron ball 61, which is a weight, is set on it to form a vibration-sensing device. When an earthquake occurs, the iron ball 61 vibrates due to its vertical and horizontal shaking and falls on the weight receiver 69. Weight receiver 69
A stopper rod 64 is connected to an extension line of the stopper rod 64, and the stopper rod 64 moves in the direction of arrow a due to the reaction when the iron ball falls. The movement causes the stopper bar to be disengaged from the hook metal 7, and the hook metal 7 moves in the direction of arrow b by the force of the spring 66 (see FIG. 11 (b)) to receive the metal fitting 8 attached to the door (see FIG. 11 (b)). The door is locked by fitting a part of the hook metal fitting 7 with a notch).

FIG. 11 (b) shows a state in which the seismic sensing device is activated. The iron ball 61 falls onto the weight receiver 69 due to the shaking of the earthquake, and the stopper rod 64 is disengaged from the hook metal fitting 7 and fitted to the metal receiver 8. The combined state is shown. The weight table 62 has a sensitivity adjusting function as a vibration sensing device. The weight base 62 is provided with the support plate 6 together with the weight receiving support arm 622 integrally formed.
The weight receiving support arm 622 is hollow, and a flexible joint 67 for connecting the adjusting screw 63 and the sensitivity adjusting rod 65 shown in FIG. 11A is inserted.

To adjust the sensitivity, when the adjusting screw 63 shown in FIG. 11A is turned in the direction of arrow c (clockwise), the flexible joint 68 connected to the adjusting screw 63 rotates,
The sensitivity adjusting rod 65 connected thereto rises in the direction of arrow d. As a result, the iron ball 61 is pushed up, and the iron ball falls and the lock operates even with a smaller unstable swing. In this way, this lock unit allows the sensitivity to be set by the consumer's intention.

As described above, according to the present invention, in order to solve the above-mentioned problems, the lock unit is provided with a seismic device so that the release button or the knob is not necessary. It can be said that the novelty that the conventional lock mechanism of the double door does not have is that it does not require any secondary processing and does not impair the appearance of furniture at all.

In the first to third embodiments described above, the lock for the double door of the present invention has been described as the cupboard to which the lock is attached. However, the lock is not limited to the cupboard because of the function of the lock. It can be used for anything such as door furniture and storage shelves. Further, this lock is premised on retrofitting, but it may be handled as a part of furniture, a storage rack, etc., which is built into them from the beginning.

【The invention's effect】

According to the lock for double doors according to the present invention, the lock that can be retrofitted by the consumer, but the structure that can be seen from the entire surface of the closet is only the unlock button, so that the aesthetics, interior and image of the closet are impaired. No
In addition, it is possible to provide a lock exclusively for the double door that allows the door to be locked at all times. Further, since the lock release button has a structure that can be integrated with the handle portion of the door of the closet, the door can be opened with one touch even after the lock is attached, which does not burden the operation. Further, the lock is easily attached to the closet because the main part of the lock is unitized, and most double doors can be attached to the closet. By summarizing the above, it is possible to alleviate the conventional problems and newly provide a lock exclusively for the double door that has not existed until now.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of a double door lock according to a first embodiment of the present invention.

FIG. 2 is a side view of the double door lock of the present invention shown in FIG. 1, as seen from the direction of the arrow.

FIG. 3 is an enlarged view of a latch receiver 5 in FIG.

FIG. 4 is a perspective view showing the operating principle of the double door lock of the present invention shown in FIG. 1.

FIG. 5 is a perspective view showing an outline of a double door lock according to a second embodiment of the present invention.

FIG. 6 is a side view of the double door lock according to the second embodiment of the present invention shown in FIG. 5, as viewed in the direction of the arrow.

FIG. 7 is a perspective view showing the operating principle of the double door lock according to the second embodiment of the present invention.

8 is a perspective view showing details of a method of attaching a release button to be installed on the handle portion of the door in FIG.

FIG. 9 is a front perspective view of a double door lock according to a third embodiment of the present invention mounted on a cupboard.

FIG. 10 is a perspective view of the details of the receiving metal fitting 8 attached to the door side in FIG. 9 as seen from the back side when the door is opened.

FIG. 11 is a perspective view showing the details of the operating principle of the double door lock according to the third embodiment of the present invention shown in FIG. 9;

FIG. 12 is a perspective view showing an example of a metal fitting that has been diverted to a conventional double door lock.

FIG. 13 is a perspective view showing an example of a door lock mechanism of a double door office locker.

[Explanation of symbols]

 1 Door of the closet 10 Holding frame (crosspiece) 11 Glass of the closet 12 Upper plate of the closet 13 Handle counterbored on the holding frame 14 Long hole 2 Protective case 21 Release knob or release button 211 Base of release knob 22 Small pulley 23 Two-step pulley 24 Large pulley 25 Pulley belt 26 Release knob mounting slide rail 27 Rod rod 272 Rod rod tip side 273 Rod rod opposite tip side 28 Release button connecting shaft 281 Release button connecting shaft screw hole 282 Fixing screw 3 Wire Wire 4 Latch 41 Latch rod 42 Spring 5 Latch receiver 51 Hooking type latch 52 Latch 53 Ring 6 Lock unit 61 Iron ball 62 Weight base 622 Weight bearing support arm 63 Sensitivity adjusting screw 64 Stopper rod 65 Sensitivity adjusting rod 66 Spring 67 Flexible joint 68 Support plate 69 Weight receiver 7 Hooking metal fitting 8 Metal fitting 81 Concave rail 811 Stopper embossing 82 String 83 Adhesive tape 9 Lot rod tip fitting part

Claims (3)

[Claims] 1. A lock structure for a double-sided door such as a cupboard for earthquake countermeasures, in which the lock system is a constant lock system and the force transmission mechanism from the release knob to the latch is unitized and mounted on the back side of the door. The latch is released by pushing down the release knob installed on the side face between both doors or inside the handle that is counterbored, and the lock release mechanism has two small strokes of the release knob. A double door lock that uses a mechanism such as a pulley to convert the stroke so that the latch can be released. 2. In a lock structure for a double-sided door such as a cupboard for earthquake countermeasures, the lock system is an operation type only when an earthquake occurs, and a seismic sensing device based on the principle that a weight falls when an earthquake occurs Due to the operation, the weight falls to the weight receiver,
As a result of this reaction, the stopper bar connected to the weight receiver comes off from the hook metal fitting, and as a result, the receiver metal fitting and the hook metal fitting attached to the back side of the door fit and the door locks. . 3. Furniture having the double door lock according to claim 1 or 2 incorporated therein from a manufacturing stage.