Locking device for door

The present invention relates to a door locking device for preventing a door such as a cupboard from opening without permission due to an earthquake or the like, and more specifically, to a rotary door locking device that automatically locks when the door is closed. It is a thing.

In the event of an earthquake, there is concern that doors such as cupboards and chests of drawers will open without permission due to vibration, and stored items will be scattered indoors. In particular, many of the items stored in the cupboard are made of glass or pottery and are fragile due to the impact of dropping, so the fragments can cause secondary damage.

Various disaster prevention products have been proposed to prevent secondary damage caused by such opening of the door, but as a simple configuration, for example, as described in Patent Document 1, double doors are opened. There is a door opening stopper that prevents the door from opening and closing by hanging a ball chain between the fixing brackets provided on each door body.

Further, for example, Patent Document 2 proposes a seismic locking device that prevents the door from opening by detecting vibration by a pendulum type seismic sensing means and automatically operating the lock shaft. According to this, it can be used in daily life without any trouble in opening and closing, and the door can be automatically locked when shaking is detected.

However, any of the devices has the following problems. That is, in the case of the opening stopper described in Patent Document 1, it is necessary to always hang the ball chain and lock it, and the lock must be released each time it is opened and closed. In addition, since it is difficult to operate with one hand, there is also difficulty in operability.

Further, it is undeniable that the seismic lock tool described in Patent Document 2 requires a complicated configuration for the seismic sensing means, so that the cost is high. In addition, it is often locked due to a malfunction, and it is troublesome to unlock each time. Not only that, there are also concerns about whether it will work reliably in the event of an earthquake.

<patcit num="1"><text>Japanese Unexamined Patent Publication No. 10-42986</text></patcit><patcit num="2"><text>Japanese Unexamined Patent Publication No. 9-88402</text></patcit>

<p> The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to ensure that the door is easy to operate, including attachment to the door, and that the door is automatically locked each time the door is closed. The purpose is to provide the locking device of the above at a low price.</p>

<p> In order to achieve the above object, the present invention has some features shown below. First, the invention according to claim 1 is a door locking device that automatically locks a rotary door body provided in a cupboard or the like when the rotary door body is closed. The first fixed unit includes the first and second fixed units arranged to face each other as a pair, and the first fixed unit includes a lock lever capable of entering and retreating with respect to the second fixed unit and the lock lever. 2 A spring means that constantly urges the vehicle in the approach direction toward the fixed unit, and a locking position in which the lock lever is deeply inserted into the second fixed unit, retreats to the unlocking position against the urging force of the spring means. An operation knob for causing the lock lever and a lock control means for controlling the movement of the lock lever are provided, and the lock control means is a tip of the lock lever in a state where the door body can be closed from the unlocked position. When a part of the side guides the user to a standby position where the edge of the second fixed unit can abut, and when the lock lever abuts on the second fixed unit and is retracted at the standby position, the lock lever waits. It is characterized in that it can be moved from the position to the locked position.</p><p> According to the second aspect of the present invention, in the first aspect, the lock control means includes a relatively moving latch pin and a latch pin guide portion, and the latch pin guide portion includes the latch pin. A first latch guide groove on the outward path side that guides the latch pin from the locked position to the first unlocked position, and an intermediate second latch guide groove that guides the latch pin from the unlocked position toward the standby position. It is characterized in that the third latch guide groove on the return path side, in which the latch pin is once guided from the standby position to the second unlocking position and then returned to the locking position, is formed in an annular shape.</p><p> According to the third aspect of the present invention, in the second aspect, the lock control means is provided with a see-through hole that makes the pin end of the latch pin visible at least at the lock position and the standby position. It is characterized by that.</p><p> According to a fourth aspect of the present invention, in any one of the first to third aspects, each of the fixing units includes a housing formed in a tubular shape, and the tip of the lock lever and / or the second fixing unit. The opening edge of the housing of the unit is characterized in that a tapered surface is formed which applies a force in the rotational direction to the lock lever as a force in the linear direction.</p><p> The invention according to claim 5 is the lock lever guide including a guide rail and a guide groove between the lock lever and the housing of the second fixing unit in any one of claims 1 to 4. It is characterized in that means are provided.</p><p> According to a sixth aspect of the present invention, in any one of the first to fifth aspects, when the fixing units are arranged in pairs on the left and right sides of the door stop of the door body, they are spaced apart from each other. It is characterized by having a spacer that defines the above.</p><p> According to a seventh aspect of the present invention, in the first to sixth aspects, the lock lever prevents the lock lever from coming out of the second fixing unit when the door body is forcibly opened. It is characterized in that a drop-out prevention means is provided for this purpose.</p><p> According to the eighth aspect of the present invention, in the seventh aspect, the dropout preventing means comprises a locking groove formed along the width direction on the bottom surface of the lock lever on the side facing the door body. The toe is characterized in that it meshes with the opening of the second fixing unit.</p><p> According to a ninth aspect of the present invention, in any one of the first to eighth aspects, each of the fixing units has a base plate attached to a surface to be attached via a predetermined fixing means, and the base plate is attached. Is characterized in that it is slidably attached to each of the above-mentioned fixed units.</p>

<p> According to the invention of claim 1, when the operation knob is slid to return the lock lever to the unlocked position to open the door and then the operation knob is released, the lock lever is guided to the standby position by the lock control means. The tip of the lock lever is held so that it can come into contact with the edge of the second fixing unit. Therefore, when closing the opened door, the lock lever is pushed back by the second fixing unit (or the door contact of the door), whereby the lock lever pops out from the standby position to the locking position and locks the door. As described above, according to the present invention, the door is automatically locked each time the door is closed, so that the user can be given a sense of security (reliability). Moreover, since it does not require a vibration sensing means having a complicated configuration, it can be provided at low cost.</p><p> According to the invention of claim 2, the lock control means includes a latch pin and a latch guide groove, does not include any electrical control system, and does not require a vibration sensing means having a complicated configuration, so that the cost is low. Can be provided.</p><p> According to the third aspect of the present invention, not only the position of the latch pin can be confirmed and the operation can be checked at the time of assembly, but also repair can be performed in the case of a simple failure.</p><p> According to the invention of claim 4, the tip of the lock lever and / or the opening edge of the housing of the second fixing unit is provided with a tapered surface that applies a force in the rotational direction to the lock lever as a force in the linear direction. , The lock lever can be pushed back securely when closing the door.</p><p> According to the invention of claim 5, since the lock lever guide means including the guide rail and the guide groove is provided between the lock lever and the housing of the second fixing unit, an excessive load is applied even in the locked state. Even if it is applied, it can be prevented from being unlocked or destroyed.</p><p> According to the invention of claim 6, a spacer for relative positioning of the first fixed unit and the second fixed unit is attached, so that even a user who is not good at mounting work can be in an accurate position. It can be installed securely.</p><p> According to the inventions of claims 7 and 8, even if a force in the opening direction of the door body is forcibly applied by providing a locking groove as a fall-out prevention means in a part of the lock lever, the lock is locked. It is possible to prevent the door from opening by catching the locking groove of the lever on the opening edge of the second fixing unit.</p><p> According to the invention of claim 9, since the base plate is slidably attached to the fixed unit, the fixed unit slides to the base plate even if the door body is forcibly opened. It is possible to absorb a part of the opening amount of the door.</p>

Next, an embodiment of the present invention will be described with reference to the drawings, but the present invention is not limited thereto. The drawings used for the explanation are FIGS. 1 to 10, of which FIG. 1 is a perspective view showing a state in which the door locking device according to the present invention is used for a double door such as a cupboard, and FIG. 2 is a locking view of the door. It is a perspective view which shows the state which the device was unlocked.

First, referring to FIGS. 1 and 2, the door locking device 10 symmetrically sandwiches the door stop 4 in each of the door bodies 2 and 3 provided in the storage furniture 1 such as a cupboard. It has two fixing units 20, 30 that can be attached. The door to be applied may be a single door type as long as it is a rotary type. In the first place, the sliding door is not the subject of the present invention because it is difficult to open due to an earthquake.

As shown in FIG. 2, one of the fixed units 20 and 30 has a lock lever 40 that can be retracted, and the other fixed unit 30 is used as a receiver for the lock lever 40. The fixed unit 20 is on the active side and the other fixed unit 30 is on the passive side. Each configuration will be described below, with one fixed unit 20 as the first fixed unit on the active side and the other fixed unit as the second fixed unit on the passive side.

With reference to FIGS. 3 (a) and 3 (b), the first fixed unit 20 includes a first unit housing 21 formed in a square tube shape. The first unit housing 21 may be directly fixed to the door body 2 with double-sided adhesive tape or screws, but in this example, the first unit housing 21 is the door body 2 via the first base plate 22. Attached to.

That is, the first unit housing 21 and the first base plate 22 are relatively slidable, and after fixing the first base plate 22 to the door body 2 with, for example, double-sided adhesive tape 23, the first base plate 22 is attached to the first base plate 22. By sliding and engaging the 1 unit housing 21, the 1st unit housing 21 is fixed to the door body 2 via the 1st base plate 22.

According to this, as shown in FIG. 11, when a force is forcibly applied to the door bodies 2 and 3 in the opening direction, the first base plate 21 is subjected to the opening amount of the doors 2 and 3. On the other hand, the first unit housing 21 slides to absorb the deviation, so that the door bodies 2 and 3 can be prevented from opening.

In FIG. 3B, the left end side of the first unit housing 21 is open and the right end side is closed. Inside the first unit housing 21, a lock lever 40 that moves in and out (enters / retracts) toward the second fixed unit 30 and a lock control means 50 that holds the lock lever 40 in a predetermined position are provided.

A slidable operation knob 44 for operating the internal lock lever 40 is provided on the upper surface of the first unit housing 21. In this example, the operating knob 44 is provided with two fixing pins 45 at both ends thereof, and is locked by inserting the fixing pins 45 into the insertion holes 43 (see FIG. 4 (a)) drilled in the lock lever 40. It is connected to the lever 40. As shown in FIG. 3A, two slide holes 24 for allowing the fixing pin 45 to move are provided in parallel on the upper surface of the first unit housing 21.

The lock lever 40 is made of a molded product of synthetic resin, and is formed in a prismatic shape that can slide along the inside of the first unit housing 21. As shown in FIG. 4A, the lock lever 40 has tapered surfaces 41 and 41 cut in a mountain-cut shape (arrowhead shape) at its tip, and both side surfaces of the lock lever 40 are in the advancing / retreating direction. A guide groove 42 is formed along the line.

The tapered surfaces 41 and 41 are inclined surfaces required to apply a rotational force applied to the door bodies 2 and 3 as a linear force with respect to the lock lever 40, and in this example, the advance / retreat direction of the lock lever 40. It is provided at an angle of about 45 ° with respect to.

In addition, by forming guide grooves 42 on both side surfaces so that they mesh with the guide rail 33 (see FIG. 2) on the second fixing unit 30 side, even when an excessive load is applied in the locked state. I try not to unlock it easily.

Next, the lock control means 50 for controlling the movement of the lock lever 40 will be described with reference to FIGS. 4 (a) to 4 (c). The lock control means 50 is a push latch type, and the lock control means 50 always has a latch pin guide portion 51, a latch pin 53, and a lock lever 40 that are integrally attached to the rear end side of the lock lever 40 as a second fixing unit 30. It includes a coil spring 54 that urges it toward the side.

The latch pin 53 is formed in a U shape by bending both ends of the metal rod at approximately 90 °, and the hook portion at the tip is dropped into the latch guide groove 52 formed in the latch pin guide portion 51, and the rear end is formed. The hook portion of the first unit housing 21 is rotatably supported around the vertical axis on the inner wall of the first unit housing 21.

In this example, the coil spring 54 is composed of a compression spring arranged between the inner wall of the first unit housing 21 and the latch pin guide portion 51, and is spring-loaded in a direction that always pushes out the lock lever 40 via the latch pin guide portion 51. It is gaining momentum.

The latch pin guide portion 51 advances and retreats integrally with the lock lever 40, whereas the latch pin 53 does not advance and retreat, but the tip portion of the latch pin 53 moves relative to the inside of the latch guide groove 52 according to the movement of the latch pin guide portion 51. Move to.

With reference to FIGS. 4 (b) and 4 (c), the latch guide groove 52 includes a first latch guide groove A on the outward path side that guides the latch pin 53 from the locking position 52a to the first unlocking position 52b. The second latch guide groove B in the middle that guides the latch pin 53 from the first unlocking position 52b toward the standby position 52c, and the latch pin 53 once guided from the standby position 52c to the second unlocking position 52d and then to the locking position 52a. It includes the third latch guide groove C on the return path side.

The locking position 52a is a position (locking position) in which the lock lever 40 is completely pushed out into the second fixing unit 30 by the urging force of the coil spring 54 as shown in FIG. 8 (a). The first unlocking position 52b is a position (unlocking position) in which the user puts his finger on the operation knob 44 and pulls back the lock lever 40 into the first fixing unit 20 as shown in FIG. 8 (b). You can open the door with.

The standby position 52c protrudes from the first unlocking position 52b due to the urging force of the coil spring 54 when the finger is released from the operation knob 44 at the first unlocking position 52b, and the lock lever is as shown in FIG. 8 (c). This is the position (semi-lock position) where the tapered surface 41 at the tip of 40 is held so that it can abut on the edge of the second fixing unit 30. The second unlocking position 52c exists at a position symmetrical to the first unlocking position 52b with the standby position 52c as the center, and the first fixing unit 20 is closed by the door at which the lock lever 40 at the standby position 52c is closed. This is the position where it is pushed back in.

Of the latch guide grooves 52, the first latch guide groove A on the outward path side reaches the first unlocking position 52b on an inclined surface whose bottom becomes an upward slope from the locking position 52a to the first unlocking position 52b. Immediately before, a stepped surface 52e for preventing pin return is formed.

The second latch guide groove B in the middle includes a route from the first unlocking position 52b to the second unlocking position 52d through the standby position 52c, and the first unlocking position 52b and the standby position 52c A stepped surface 52f for preventing pin return is formed between them, and a stepped surface 52g for preventing pin return is also formed between the standby position 52c and the second unlocking position 52d.

The third latch guide groove C on the return path side is an inclined surface whose bottom becomes an upward slope from the second unlocking position 52d toward the locking position 52a, and is a stepped surface for preventing pin return immediately before reaching the locking position 52a. 52h is formed. According to this, the tip portions of the latch pins 53 can surely pass through the latch guide grooves A to C in one way without reversing due to the stepped surfaces 52e to 52h.

With reference to FIG. 3A again, confirmation windows 25 and 26 are provided on the upper surface of the first unit housing 21 so that the front end portion and the rear end shaft support portion of the latch pin 53 can be visually recognized. The confirmation windows 25 and 26 consist of a through hole in which a part of the inside can be seen from the upper part of the first unit housing 21, from which the end of the push pin 53 can be seen and the operation can be confirmed. Further, for example, when the push pin 53 comes off from the latch guide groove 52, a tool or the like can be inserted from there to correct the position.

Next, the second fixed unit 30 on the passive side will be described again with reference to FIG. The second fixed unit 30 includes a second unit housing 31 formed in a square cylinder shape like the first fixed unit 20, and may be attached to the door body 3 side via the second base plate 32. Since the second base plate 32 may have the same configuration as the first base plate 22 on the first fixed unit 20 side, the description thereof will be omitted.

The second unit housing 31 has one end side facing the first unit housing 21 open and the other end side closed. A guide rail 33 slidably engaged with the guide groove 42 of the lock lever 40 is provided on the opposite inner side surface of the second unit housing 31.

Further, the second unit housing 31 is preferably a tapered surface 34 whose edge on the side facing the first fixed unit 20 is rounded. According to this, the tip (tapered surface 41) of the lock lever 40 held at the standby position 52c when the door bodies 2 and 3 are closed can be easily overcome.

When the first and second fixing units 20 and 30 described above are attached to the door bodies 2 and 3, respectively, the lock lever 40 on the first fixing unit 20 side is accurately placed in the second unit housing 31 on the second fixing unit 30 side. It is necessary to position its relative position and distance (interval) so that it fits into the door. Therefore, the door locking device 10 according to the present invention includes the spacer 60 shown in FIG. 6 for positioning the relative mounting positions of the fixing units 20 and 30.

The spacer 60 is preferably made of a synthetic resin plate having a thickness (3 mm in this example) that keeps a proper spacing between the fixing units 20 and 30, and a guide hole 61 into which the lock lever 40 is inserted in the center. Is provided.

According to this, as shown in FIG. 7, the fixing units 20 and 30 can be installed at the optimum position by attaching the fixing units 20 and 30 to the door bodies 2 and 3 with the spacer 60 sandwiched in advance. It is preferable that both side surfaces of the guide hole 61 are provided with convex portions 62 that match the guide groove 42.

Next, a series of push latch operations of the door locking device 10 according to the present invention will be described with reference to FIGS. 5 (a) to 5 (d) and FIGS. 8 (a) to 8 (c). Here, as shown in FIGS. 5 (a) and 8 (a), the locked state in which the lock lever 40 is urged by the coil spring 54 and deeply penetrates into the second fixed unit 30, that is, the lock lever 40 is The initial position is when the latch pin 53 holds the lock position 52a.

To open the door from this initial locked state, first place your finger on the operating knob 44 and slide the lock lever 40 to the right against the urging force of the coil spring 54, as shown in FIG. 5 (b). Move the latch pin 53 until the tip of the latch pin 53 hits the first unlocking position 52b. As a result, the lock lever 40 is removed from the second fixing unit 30 as shown in FIG. 8 (b), so that the user can open the door.

When the finger is released from the operation knob 44 after opening the door, the lock lever 40 is pushed out by the coil spring 54. At this time, the tip of the latch pin 53 is caught in the groove of the standby position 52c, so that the lock lever 40 is shown in FIG. 5 (c). ), It is held at a position slightly protruding from the unlocking position in Fig. 5 (b). That is, at this standby position 52c, the lock lever 40 is held so that the tapered surface 41 at its tip is in contact with the edge of the second fixed unit 30 as shown in FIG. 8 (c).

Next, when the door is moved in the closing direction, the tapered surface 41 of the lock lever 40 abuts on the edge of the second fixing unit 30 as shown in FIG. 8 (c), whereby the lock lever 40 is moved in FIG. 5 As shown in (d), it is pushed back against the urging force of the coil spring 54. At this time, the tip of the latch pin 53 moves from the standby position 52c to the second unlocking position 52d.

Then, when the door is completely closed and the second fixing unit 30 gets over the tapered surface 41 of the lock lever 40, the tip of the latch pin 53 enters the third latch guide groove C on the return path side from the second unlocking position 52d. , The lock lever 40 is pushed out by the coil spring 54 and returned to the initial position shown in FIGS. 5 (a) and 8 (a).

That is, the lock lever 40 deeply enters the second unit housing 31 of the second fixing unit 30 when the tip of the latch pin 53 reaches the locking position 52a through the third latch guide groove C on the return path side. In this way, according to the present invention, the door is automatically locked when the door is closed.

FIGS. 8 (a) to 8 (c) show the operation when the door body 2 on the first fixed unit 20 side is opened and closed, but also when the door body 3 on the second fixed unit 30 side is opened and closed. As shown in 9, the edge of the second unit housing 31 abuts on the tapered surface 41 at the tip of the lock lever 40 and pushes back the lock lever 40 once, so that the lock lever 40 is automatically locked in the same manner as described above.

That is, when closing the door with the door bodies 2 and 3 both open and separated, if one of the door bodies is closed first and then the other door body is closed, the lock can be automatically locked. it can.

In the above embodiment, the first fixed unit 20 and the second fixed unit 30 are door bodies 2, 3 by inserting the lock lever 40 provided on the first fixed unit 20 side toward the inside of the second fixed unit 30. Although the opening and closing of the door is regulated, Fig. 10 (a) and (b) show an example of a method for fixing the door more firmly. The same reference numerals are given to the parts that are the same as or the same as those in the above embodiment, and the description thereof will be omitted.

As a feature of this locking device 10, a locking groove 70 is provided in a part of the lock lever 40 as a means for preventing it from falling off. The locking groove 70 is composed of a notch groove carved in an inverted V shape along the width direction on the bottom surface of the lock lever 40 on the side facing the door bodies 2 and 3, and in this example, two locking grooves 70 are formed. Grooves 70 and 70 are provided adjacent to each other along the sliding direction of the first base plate 22.

According to this, as shown in FIG. 11, when a force is forcibly applied to the door bodies 2 and 3 in the opening direction, the locking groove 70 is caught by the opening edge of the other second fixing unit 30. As a result, it is possible to prevent the lock lever 40 from coming out of the second fixed unit 30 and opening the door bodies 2 and 3. Such aspects are also included in the present invention.

In this example, the dropout preventing means is composed of the notch groove 70, but in addition to the notch groove 70, a high friction treatment such as embossing may be performed.

Further, in the case of a single door, one of the first fixed unit 20 and the second fixed unit 30 may be installed on the hinged door side, and the other may be installed on the wall on the door stop side. Of course, the door locking device of the present invention can be applied not only to cupboards but also to, for example, room doors.

<figref num="1">The perspective view which shows the state which applied the door locking device which concerns on one Embodiment of this invention to a door of a cupboard.</figref><figref num="2">The perspective view which shows the unlocked state of the door locking device.</figref><figref num="3">(a) A plan perspective view showing the internal structure of the first fixing unit included in the door locking device, and (b) a side perspective view thereof.</figref><figref num="4">(a) A perspective view showing the lock control means, (b) an enlarged perspective view showing the latch pin guide portion included in the lock control means, and (c) a plan view showing the latch guide groove formed in the latch pin guide portion.</figref><figref num="5">(a)-(d) A plan perspective view illustrating a series of operations of the lock control means.</figref><figref num="6">The perspective view of the spacer provided with this invention.</figref><figref num="7">The side view which shows the use state of the said spacer.</figref><figref num="8">(a)-(c) Operational explanatory view of the present invention.</figref><figref num="9">The operation explanatory drawing of this invention.</figref><figref num="10">(a) Cross-sectional view of the main part showing the state where the lock lever is provided with the fall prevention means, (b) Partial enlarged view of the lock lever.</figref><figref num="11">The operation explanatory drawing explaining the state in which the dropout prevention means actuated.</figref>

Code description

1 Storage furniture 2, 3 Doors 4 Doors 10 Door locking device 20 1st fixing unit 30 2nd fixing unit 40 Lock lever 41 Tapered surface 42 Guide groove 44 Operation knob 50 Lock control means 51 Latch pin guide part 52 Latch guide Groove 53 Latch Pin 54 Coil Spring 60 Spacer 70 Notched Groove