JP2003013652A - Safety lock for door and its unlocking prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a crime preventive function of a safety lock for a door by making it difficult to release the lock just for an escapade or break the lock from the outdoor side. SOLUTION: This release prevention device 26 to be used for a safety lock 1 for a door comprises a lock-stopping pin 5 attached to a side surface inside a door frame 4 and a locking arm 6 attached in a freely rotatable manner to the inner surface of the door 2 so as to make it connectable in a freely shiftable manner in the longitudinal direction of the arm relative to the locking pin 5. This unlocking prevention device 26 is equipped with a mounting base 27 attachable to the side surface inside the door frame 4, and a stopper arm 28 which is provided in a freely making a relative motion to the mounting base 27 in such a manner that it becomes freely shiftable either to a lock position linked to the upper edge or lower edge of the locking arm 6 coupled to the locking pin 5 in a freely slidable manner or unlock position separating from the upper edge or the lower edge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door lock for auxiliary locking an indoor / outdoor door in a half-open position and a device for preventing the unlocking.

[0002]

2. Description of the Related Art An entrance door for partitioning indoors and outdoors in a condominium, a detached house, etc. is provided with a precautionary lock for auxiliary locking the door in a half-open position in addition to a locking device for main locking. There is.

As this type of safety lock, a support bracket attached to the indoor side surface of the front end of the door, a latch pin attached to a door frame that rotatably supports the door, and a vertical axis around the support bracket. In addition, a locking arm that is rotatable and cantilevered and that is slidably connectable to a locking pin in the arm longitudinal direction has been put into practical use.

Among the constituents of the above-mentioned locking pad, the retaining pin has a body and a head having a diameter larger than that of the body, and the retaining arm can be inserted through the body of the retaining pin, but the head is It has a slide hole that extends in the longitudinal direction of the arm that cannot be inserted. Further, in the conventional heart lock, an insertion portion for guiding the engagement pin into the slide hole of the engagement arm is formed in the engagement arm, and the insertion portion has a size capable of inserting the head. In addition, it is constituted by a large-diameter hole arranged from the base end portion of the latch arm in a state of communicating with the slide hole.

Therefore, according to the locking lock, the locking arm is erected indoors with the door closed, and the locking pin is inserted into the insertion portion of the arm. Can be locked. On the other hand, if the latch arm is tilted to the door side with the door closed, the arm can be disengaged from the latch pin and the lock can be unlocked.

[0006]

As described above, in order to release the lock by the conventional guide lock, in order to pull out the locking pin from the large-diameter hole of the locking arm, the door is closed and the locking is performed. Since the stop arm only has to be tilted to the door side, there is an advantage that the lock for the safety lock can be released very easily. On the other hand, on the other hand, if the unlocking operation is too easy like this, even if one of the users indoors locked the precautionary lock, a young child indoors could unlock it for fun. There is a risk that the security function of the precautionary tablet will be abruptly impaired.

In addition, since the conventional locking lock is locked by slidably connecting the latching arm to the latching pin, an intruder such as a thief who has unlocked the lock can use the latching pin body. If you use a saw to cut through the gap between the doors that are half open, you can break the lock even if it takes some time.In this respect, it is said that the security function of the lock is perfect. Is hard to say.

[0008] Therefore, an object of the present invention is to improve the crime prevention function of a door lock by making it more difficult for the lock to be unlocked or to be unlocked from the outdoor side in a fun half. is there.

[0009]

In order to achieve the above-mentioned object, the present invention takes the following technical means. That is,
The present invention relates to a release prevention device used for a door lock having the above-mentioned latching pin and a latching arm, wherein the mounting base is attachable to the inner surface of the frame of the door frame, and is slidable on the above-mentioned latching pin. Relatively movable with respect to the mounting base so as to be switchable between a lock position that engages with the upper edge or the lower edge of the connected hooking arm and an unlock position that separates from the upper edge or the lower edge. And a stopper arm provided on the.

In this case, the stopper arm provided so as to be relatively movable with respect to the mounting base on the door frame side is engaged with the upper edge or the lower edge of the hooking arm slidably connected to the hooking pin. The lock arm can be switched to either the lock position or the unlock position where the stopper arm is disengaged from the upper edge or the lower edge, so the stopper arm is switched to the lock position after the latch arm is slidably connected to the latch pin. As a result, the latch arm connected to the latch pin can be doubly locked by the stopper arm. For this reason, first, the stopper arm must be switched to the unlocked position before the latch arm can be tilted to the door side to release the lock easily. It becomes difficult to release the alarm, and it is effectively prevented that the crime prevention function of the precautionary tablet is disturbed.

Further, in the present invention, since the latch arm is doubly locked by the latch pin and the stopper arm, the stopper arm is set to the lock position after the latch arm is connected to the latch pin. If you do this, even if an intruder such as a thief who unlocks this lock attempts to unlock the lock by inserting a tool such as a thread saw through the gap in the half-opened door,
Unless the stopper arm as well as the body of the latch pin is cut, the lock cannot be released by the watch lock, which makes it extremely difficult to break the lock from the outside.

In the above-described present invention, the release preventing device further includes an urging member that constantly urges the stopper arm to the unlock position, and when the stopper arm is moved to the lock position against the urging member. It is preferable to include a holding member that holds the arm in the locked position and an operation member that releases the holding by the holding member.

In this case, when the stopper arm is moved to the lock position against the biasing member, the holding member holds the arm at the lock position, so that the stopper arm at the unlock position can be moved to the lock position with one touch. In addition to being switchable, an urging member that constantly urges the stopper arm to the unlock position and an operation member for releasing the holding by the holding member are provided.
The stopper arm in the locked position can be switched to the unlocked position with one touch simply by operating the operation member, which makes switching work of the stopper arm very simple.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a door lock 1 with an unlocking prevention device 26 according to the present invention. As shown in FIG. 1, this precaution pad 1 is for auxiliary locking an entrance door 2 that partitions indoors and outdoors in a half-opened position, and a support bracket 3 attached to an indoor side surface of a front end of the door 2. A latch pin 5 attached to a door frame 4 that rotatably supports the door 2,
Is equipped with.

Further, the body lock 1 of the present embodiment is provided on the support bracket 3 so as to be rotatable about the longitudinal axis and cantilevered, and slides in the arm longitudinal direction with respect to the latch pin 5. A locking arm 6 that can be freely connected is provided, and a push button locking device 7 that locks the locking arm 6 with respect to the locking pin 5 and holds the connection thereof. The support bracket 3 includes a mounting board 8 formed in a vertically long rectangular plate shape, and a pair of upper and lower support plate portions 9 projecting from the upper and lower ends of the mounting board 8, and the mounting board 8 is screwed. It is fixed to the front end portion of the door 2 by being screwed to the indoor side surface of the door 2 at 10.

On the other hand, the hooking pin 5 is connected to a mounting base 11 formed in a substantially elliptical plate shape, a body 12 standing upright from the center of the mounting base 11, and a tip of the body 12. The head 13 having a larger diameter than the body 12 is integrally provided, and the mounting base 11 is screwed to the inner surface side of the frame of the door frame 4 by the screw screw 14, so that the head 13 is moved to the door 2 side. It is fixed to the door frame 4 in a protruding state.

The latch arm 6 has a cylindrical boss portion 16 connected to the upper end of the push button locking device 7, and the boss portion 1.
6, and an arm body 17 projecting radially outward. The arm main body 17 is composed of a frame member having a substantially horizontal U-shape having therein a slide hole 18 extending in the arm longitudinal direction. The slide hole 18 allows the body portion 12 of the latch pin 5 to be inserted, but the head portion 13 Is a width dimension that cannot be inserted.

Further, the first insertion portion 19 and the second insertion portion 20 into which the latching pin 5 can be inserted in the distal end portion and the proximal end portion of the arm body 17 in a state of being substantially orthogonal to the arm longitudinal direction.
Are formed. Each insertion portion 19, 20 of this embodiment
Is a substantially circular large-diameter hole formed by widening both ends of the slide hole 18, and the large-diameter hole has a size that allows the head portion 13 of the latch pin 5 to be inserted therethrough. The hooking arms 6 are arranged at both ends in the longitudinal direction in a communicating state.

Inside the latch arm 6, the first insertion portion 19 is provided.
A lock member (not shown) that moves between a lock position for preventing the retaining pin 5 inserted through the stopper from coming off and an unlock position for releasing the retainer is embedded. The lock member is interlocked with a trigger member 21 provided slidably in the arm longitudinal direction of the arm body 17, and the trigger member 21 is pulled toward the arm base end side to position the lock member at the lock position. can do.

The push button locking device 7 allows the lock member to return to the unlocked position only when the push button operation is properly performed.
On the other hand, the casing 22 is provided with a substantially vertically long cylindrical shape that is rotatable about the center of the vertical axis, and a plurality of push buttons 23 that are arranged in a line in a row on the surface of the casing 22.

As described above, in the locking pad 1 of this embodiment,
A first insertion portion 19 for the latching pin 5 is provided on the tip side of the latching arm 5, and a push button locking device 7 for locking and unlocking the latching pin 5 with respect to the insertion portion 19 is provided. Therefore, the precautionary lock 1 can be easily locked and unlocked not only from the indoor side but also from the outdoor side (for details, see Japanese Patent Application No. 11-133114).

Note that, in the lock pad 1 of this embodiment, the second insertion portion 2 through which the latch pin 5 can also be inserted into the base end portion of the latch arm 6.
Since 0 is provided, the arm 6 can be connected to the latch pin 5 by erecting the latch arm 6 in a state where the door 2 is closed, as in the conventional guard lock. 1 is locked. On the other hand, in order to unlock the body lock 1, on the contrary, it is sufficient to turn over the latch arm 6 so as to face the pivot side of the door 2 while the door 2 is closed.

The lockout lock 1 according to this embodiment has the above-mentioned solution for locking the lockout lock 1 doubly by hooking the stopper arm 28 on the upper edge of the lock arm 6 connected to the lock pin 5. An unlocking prevention device 26 is provided. The unlocking prevention device 26 includes an attachment base 27 that can be attached to the inner surface of the door frame 4 and an arm of a latch arm 6 slidably connected to a latch pin 5. The mounting base 27 is configured to be switchable between a lock position (solid line position in FIG. 2) engaged with the upper edge of the main body 17 and an unlock position (phantom line position in FIG. 2) separated from the upper edge. And a stopper arm 28 provided so as to be movable relative to each other.

As shown in FIG. 1, the mounting base 11 of the retaining pin 5 is superposed on the surface side of the mounting base 27, and in this superposed state, the mounting base 27 and the mounting base 11 of the retaining pin 5 are superposed.
Is fastened to the door frame 4 together with the screw screw 14, so that the latch pin 6 and the release preventing device 26 are fixed at the same position on the door frame 4. However, the latch pin 5 and the release prevention device 26 can be attached at different positions in the indoor and outdoor directions.

Between the back surface of the mounting base 27 and the inner side surface of the door frame 4, in order to adjust the mounting position of the mounting base 27 and the latch pin 5 to the door frame 4 in the indoor and outdoor directions and the dust direction. The adjustment plate 29 of FIG. The mounting base 27 of the present embodiment includes a hollow casing 30 having a relatively thin back side having a longitudinal length larger than that of the mounting base 11 of the retaining pin 5, and a back side for closing the back side opening of the casing 30. A lid 31 is formed, and a slide frame portion 32 of a stopper arm 28, which will be described later, is inserted into an upper half portion of the casing 30 so as to be vertically movable.

As shown in FIG. 2, the stopper arm 28
Is a slide frame 32 housed in the upper half of the casing 30 so as to be vertically movable, and the slide frame 32.
And a hook portion 33 that is cantilevered from the upper end of the hook portion 33. The tip portion of the hook portion 33 is bent downward. A slide spring 34, which is a plate spring long in the vertical direction, is fixed to the back surface of the slide frame 32.

The slide spring 34 is attached to the mounting base 27.
The length of the spring 34 is almost the same in the vertical direction, and the upper end portion of the spring 34 is fixed to the back surface of the slide frame portion 32. The central portion of the slide spring 34 is inclined toward the surface side of the casing 30 (left side in FIG. 2), and the lower end portion of the slide spring 34 extends to the lower side of the mounting base 27. A plate-shaped holding member 35 is fixed to the surface of the lower end portion of the slide spring 34, and the holding member 35 is constantly supported by the leaf spring force of the central portion of the slide spring 34.
It is pressed against the back side of the front wall.

As shown in FIG. 2, a biasing member 37 made of a coil spring is housed in the center of the mounting base 27. The lower end of the biasing member 37 is attached to the mounting base 27.
It is compressed and stored in the mounting base 27 in a state of abutting against the central wall portion 36 inside thereof and the upper end of the biasing member 37 abutting against the lower end of the slide frame portion 32. The stopper arm 28 is always urged to the unlock position by the biasing member 37.

A shallow accommodating recess 38 into which the holding member 35 is just fitted is formed on the inner surface of the lower end of the casing 30, and the stopper arm 28 formed by the retaining member 35 is provided at a portion of the casing 30 corresponding to the accommodating recess 38. A push button type operation member 39 for releasing the holding of the above is fitted in the casing 30 so as to be able to move out and out in an exposed state.

Next, with reference to FIGS. 1 and 2, a method of using the precautionary lock 1 with the unlocking prevention device 26 according to the above configuration will be described together with its operation. In order to lock the door 2 from the indoor side by the safety lock 1 of the present embodiment, first, the operation member 39 is pushed to set the stopper arm 28 to the unlock position shown by the phantom line in FIG. In this state, the door 2 may be closed and the latch arm 6 may be erected indoors.

Then, the head 13 of the hooking pin 5 is inserted from the second insertion portion 20 of the hooking arm 6 into the frame of the arm 6, and the hooking arm 6 is slidable with respect to the hooking pin 5. The door lock 2 is connected and the door 2 is locked in the half-open position by the locking lock 1. In addition, the tablet 1 of the present embodiment
In order to lock the door 2 from the outdoor side by inserting the hand through the gap of the half-opened door 2, the head 13 of the hooking pin 5 is inserted into the first insertion portion 19 of the hooking arm 6, and both are locked. After connecting, the trigger member 21 provided on the latch arm 6 may be moved to the arm base end side to bring the lock member to the lock position.

After the latch arm 6 is slidably connected to the latch pin 5 as described above, the stopper arm 28 in the unlocked position is urged by the biasing member 37.
The arm 28 is pushed down against the urging force of
To switch to the lower lock position. Then, the holding member 35, which is urged by the leaf spring force of the slide spring 34 toward the back surface side of the front surface wall portion of the casing 30, fits into the storage recess 38, whereby the stopper arm 28.
Is restrained from returning to the upper side and is held at the lock position shown by the solid line in FIG. 2, and the hook portion 33 of the stopper arm 26 held at this lock position is engaged with the upper edge of the arm body 17 of the latch arm 6. Then, together with the latch pin 5, the latch arm 5
Will be linked to.

To release the lock by the lock pad 1, the push button type operation member 39 is pushed to return the stopper arm 28 to the unlock position, and the engagement with the latch arm 6 is released. After that, the head 13 of the retaining pin 5 may be pulled out from the first or second insertion portions 19 and 20 to release the connection between the retaining pin 5 and the retaining arm 6.

As described above, the release prevention device 2 of this embodiment
According to 6, the latch arm 6 is slidably coupled to the latch pin 5, and then the stopper arm 28 is switched to the lock position, whereby the latch arm 6 coupled to the latch pin 5 is moved by the stopper arm 28. Since the lock is performed doubly, it is necessary to switch the stopper arm 28 to the unlock position before the latch arm 6 is released.
It will not be possible to easily unlock the door by tilting it to the door 2 side. For this reason, it becomes difficult for a young child or the like who is indoors to unlock the lock for fun, and it is effectively prevented that the security function of the precautionary tablet 1 is abruptly impaired.

Further, according to the release prevention device 26 of this embodiment, the latch arm 6 is provided with the latch pin 6 and the stopper arm 2.
Since the lock arm 6 and the lock arm 6 are doubly locked with each other, after the lock arm 6 is connected to the lock pin 5, the stopper arm 28
If the lock is set to the lock position, even if an intruder, such as a thief who has unlocked the lock, attempts to unlock the lock by inserting a tool such as a thread saw through the gap of the door 2 that has been half opened, the lock pin 5 The lock by the lockout lock 1 cannot be released unless the stopper arm 28 as well as the body portion 12 of the lockup lock 12 is cut, and thus it becomes very difficult to break the lockout lock 1 from the outdoor side.

Further, according to the release prevention device 26 of the present embodiment, when the stopper arm 28 is moved to the lock position against the biasing member 37, the holding member 35 causes the arm 28 to move.
Is held at the lock position, the stopper arm 28 at the unlock position can be switched to the lock position with one touch, and the holding member 3 and the biasing member 37 that constantly biases the stopper arm 28 to the unlock position.
Since the operating member 39 for releasing the holding by 5 is provided, the stopper arm 28 in the locked position can be switched to the unlocked position with one touch simply by operating the operating member 39, and the switching of the stopper arm 28 can be performed. There is also an advantage that the work is very simple.

The present invention is not limited to the above embodiment. For example, the stopper arm 28 may have a structure that engages with the lower edge of the latch arm 6 instead of the upper edge thereof. In addition, the release prevention device 2 of the present invention
6 can also be adopted as a normal precautionary tablet having no push button locking device 7. Further, the connecting structure of the hooking pin 5 and the hooking arm 6 is, in short, the hooking arm 6 after connection.
It suffices that it be slidable in the arm longitudinal direction with respect to the latch pin 5, and various design changes other than those shown in the drawing are possible.

[0038]

As described above, according to the present invention, it is more difficult for the lock to be unlocked in a fun half and to be unlocked from the indoor side, so that the security function of the door lock can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an attached state of a door lock and its release prevention device.

FIG. 2 is a vertical cross-sectional view showing an attached state of a release prevention device and a latch pin.

[Explanation of symbols]

1 Door precautions 2 front door 4 door frame 5 hanging pin 6 hanging arm 26 Release prevention device 27 mounting base 28 Stopper arm 35 holding member 37 biasing member 39 Operation member

Claims (4)

[Claims] 1. A latching pin attached to an inner surface of a frame of a door frame, and rotatably attached to an inner face of a door so as to be slidably connectable to the latching pin in a longitudinal direction of an arm. A release prevention device for use in a door lock having a hooking arm, wherein the hooking arm slidably connected to the hooking pin and a mounting base attachable to an inner surface of the frame of the door frame. A stopper arm provided so as to be relatively movable with respect to the mounting base so as to be switchable between a lock position engaging with the upper edge or the lower edge and an unlock position separating from the upper edge or the lower edge. , A door lock release preventing device. 2. A biasing member for constantly biasing the stopper arm to the unlock position, and holding the arm at the lock position when the stopper arm is moved to the lock position against the biasing member. 2. The unlocking device for a door padlock according to claim 1, further comprising a holding member and an operation member for releasing the holding by the holding member. 3. A latching pin mounted on the inner surface of the frame of the door frame, and rotatably mounted on the inner surface of the door so as to be slidably connectable to the latching pin in the arm longitudinal direction. A locking arm, a mounting base mounted on the inner side surface of the frame of the door frame, and a lock position that engages with an upper edge or a lower edge of the locking arm slidably connected to the locking pin and the same upper edge. Or a stopper arm movably provided with respect to the mounting base so as to be switchable to either an unlock position where it is disengaged from the lower edge, or a door lock. 4. A biasing member for constantly biasing the stopper arm to the unlock position, and holding the arm at the lock position when the stopper arm is moved to the lock position against the biasing member. The door padlock according to claim 3, further comprising a holding member and an operation member for releasing the holding by the holding member.