Doorknob built-in alarm device

Abstract

To provide a door knob built-in alarm device capable of issuing an alarm in linkage with only a door opening operation without being attached to the outside of a door or a door knob.SOLUTION: A door knob built-in alarm device 10 is used by incorporating a device case 11 of the door knob built-in alarm device 10 in place of a body case (not shown) of an existing door knob in a door 1. A rotation projection 17P of a rotation part 17 linked with rotation operations of door knobs 31 and 34 for opening the door 1 mechanically presses a momentary switch 20, and thus an alarm issuance device 16 that has obtained electrical conductivity with a power source 21 outputs an alarm sound ES. For example, an operator A working just in front of the door 1 can know that the door 1 is about to be opened by another operator B before the opening of the door 1, and can take action to avoid danger, such as retreating from the opening range of the door 1.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] An embodiment of the present invention relates to a doorknob-mounted alarm device. [Background technology]

[0002] Generally, at a building or construction site, various types of work are carried out in any location, both indoors and outdoors, including assembling structures, installing electrical, gas and water facilities, and interior construction.

[0003] There are doors for various purposes on construction sites, such as doors leading to adjacent rooms and doors leading to the outside, but if work needs to be done in close proximity to a door, care must be taken to prevent other workers from opening and closing the door.

[0004] For example, if there is an opening in the floor just beyond the door for loading and unloading equipment, or if work is being done using a stepladder or elevated work platform just ahead of the door, the opening of the door may put workers just beyond the door in danger.

[0005] A door alarm device has been devised that can detect and alert when a door is unauthorizedly opened by utilizing the gap between the door and the door frame, and can also detect and alert when a door lock is unauthorizedly unlocked (see, for example, Patent Document 1).

[0006] A door unlocking alarm device has been devised that incorporates a circuit into an alarm device case that fits into a doorknob to detect the rotation angle of the thumb turn and sound an alarm when an illegal attempt to unlock the door from outside is attempted (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2005-120653 A [Patent Document 2] JP 2002-327561 A Summary of the Invention [Problem to be solved by the invention]

[0008] Conventional door alarm devices and door unlock alarm devices are both attached to the outside of a door or doorknob, and detect and warn of unauthorized door opening or illegal door unlocking. For example, a magnetic switch type door alarm device sounds after the door is opened, so workers near the door may not have time to recognize the danger. In addition, a contact sensor type door alarm device may not be able to detect the door opening or closing correctly at a building site or construction site where workers wear protective gear such as gloves. On the other hand, a proximity sensor type door alarm device may sound excessively at a door where many people enter and exit.

[0009] The problem to be solved by the present invention is to provide a doorknob-mounted alarm device that is capable of sounding an alarm in response to only the rotation of the doorknob, without being attached to the outside of the door or doorknob. [Means for solving the problem]

[0010] The doorknob built-in alarm device of the embodiment is A front plate attached to the end surface of the opening side of the door; a device case provided on the rear side of the front plate and having a space through which a core member that rotates in response to rotation of the doorknob passes; a latch bolt adjustment mechanism provided inside the device case and configured to cause a latch bolt to protrude or retract from the front plate in response to rotation of the core member; an alarm device provided inside the device case and configured to output an alarm sound in response to a power supply; a power supply unit provided inside the device case and configured to supply power to the alarm device via a power supply line; a switch mechanism that turns on the power supply line in response to the movement of the core member in a direction in which the latch bolt is embedded in the front plate in response to the rotation of the doorknob, and cuts off the power supply line in response to the movement of the core member in a direction in which the latch bolt is protruding from the front plate. 、 The core member is a square core that is attached across a pair of the doorknobs that are attached to one surface and the other surface of the door, The latch bolt adjustment mechanism includes a rotating part having a square core hole into which the square core is inserted, The switch mechanism turns on the power supply line in response to rotation of the pivot part in a direction in which the latch bolt is embedded in the front plate in response to rotation of the doorknob, and cuts off the power supply line in response to rotation of the pivot part in a direction in which the latch bolt is protruded from the front plate. . [Brief description of the drawings]

[0011] [Figure 1] 1 is an exploded perspective view showing a configuration in the vicinity of a doorknob of a door 1 into which a doorknob-mounted alarm device 10 according to an embodiment is incorporated. [Diagram 2] FIG. 2 is a perspective view showing the internal mechanism of the doorknob-mounted alarm device 10 when the doorknob is not turned (a state in which the door 1 can be closed). [Diagram 3] 1 is a perspective view showing an internal mechanism of the doorknob-mounted alarm device 10 when the doorknob is turned (when the door 1 is in a state in which it can be opened). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a doorknob-mounted alarm device according to an embodiment will be described with reference to the drawings.

[0013] FIG. 1 is an exploded perspective view showing the configuration of the vicinity of a doorknob of a door 1 into which a doorknob-embedded alarm device 10 of the embodiment is incorporated.

[0014] Doorknob-mounted alarm device 10 is used by installing device case 11 of doorknob-mounted alarm device 10 and its front plate 12 in place of the main doorknob case and its front plate (not shown) already installed in door 1.

[0015] As shown in FIG. 1, after removing the main body case (not shown) of the doorknob already installed on the door 1, the device case 11 of the doorknob-integrated alarm device 10 is fitted into the door 1, and the top and bottom of the front plate 12 are attached to the open end face 1F of the door 1 with device case mounting screws 13a and 13b.

[0016] From the outside of the door 1, the square core 32 (core member) of the outer door knob 31 is fitted and inserted through the square core hole 17h of the rotating part 17 exposed on the first side surface (lid) 11a of the device case 11 via the outer round seat 33.

[0017] With the square core 32 that passes through the device case 11 and protrudes from the inside of the door 1 in the center, the round seat mounting plate 36 is attached to the inside of the door 1 with the round seat mounting screws 36a, 36b, and the tip of the square core 32 is fitted into the square core hole 34h of the inner door knob 34 via the inner round seat 35 and fixed with screws not shown.

[0018] This allows the doorknob-integrated alarm device 10 to be easily incorporated into the door 1 in place of the main body case (not shown) of the doorknob already installed on the door 1.

[0019] First, the doorknob built-in alarm device 10 has a <latch bolt adjustment mechanism> that has a normal doorknob function. The normal doorknob function includes a function of sinking the latch bolt 14 into the front plate 12 in the direction indicated by the arrow B when the doorknobs 31, 34 are rotated in the direction indicated by the arrow y, thereby enabling the door 1 to be opened, and a function of causing the latch bolt 14 to protrude from the front plate 12 in the direction indicated by the arrow A by the spring force of the built-in latch bolt adjustment spring 19 (see FIG. 2) and causing the doorknobs 31, 34 to return to their original position in the direction indicated by the arrow x, thereby enabling the door 1 to be closed, by releasing the hand from the doorknobs 31, 34.

[0020] The deadbolt 15 on the front plate 12 has the same function as a normal doorknob, protruding or sinking into the front plate 12 depending on the locking / unlocking operation of a key (not shown), but a description of the mechanism for locking / unlocking using the deadbolt 15 will be omitted.

[0021] The doorknob built-in alarm device 10 has at least the following door opening operation alarm function in addition to the normal doorknob function.

[0022] The door opening operation warning function is a function that, when the doorknobs 31, 34 are rotated in the direction indicated by arrow y to sink the latch bolt 14 into the front plate 12 and make the door 1 openable, outputs a warning sound ES (see Figure 3) from an alarm issuing unit (speaker) 16S, which has multiple alarm holes exposed from the back side of the front plate 12, to warn workers near the door 1 that the door 1 is about to be opened.

[0023] FIG. 2 is a perspective view showing the internal mechanism of the doorknob-integrated alarm device 10 when the doorknob is not turned (when the door 1 is in a state where it can be closed).

[0024] FIG. 3 is a perspective view showing the internal mechanism of the doorknob-integrated alarm device 10 when the doorknob is turned (when the door 1 is in a state in which it can be opened).

[0025] 2 and 3, the second side surface 11b opposite the first side surface (lid) 11a of the device case 11 shown in FIG. 1 will be described as the bottom surface of the device case 11, and the third side surface 11c opposite the front plate 12 will be described as the rear surface of the device case 11.

[0026] In the space below the device case 11, the latch bolt 14, which protrudes from or is buried in the front plate 12, is supported by one end of a rod-shaped support core 18 that is arranged from the third side surface (rear surface) 11c of the device case 11 toward the front plate 12.

[0027] The support core 18 is urged in the direction indicated by arrow A by the spring force of a latch bolt adjustment spring 19 (not directly visible in the illustration due to the casing) interposed between the third side (rear surface) 11c of the device case 11 and the other end of the support core 18, when no external force is being applied to the rotating part 17 or the latch bolt 14, causing the latch bolt 14 to protrude from the front plate 12.

[0028] At this time, the rotating portion 17 is biased in the direction indicated by the arrow x1 via a gear mechanism (not shown) provided between the rotating portion 17 and the support core 18.

[0029] On the other hand, when force is applied by a door frame (not shown) or the like abutting against the inclined surface of the latch bolt 14, depending on the manner in which the force is applied, the latch bolt 14 slides in the direction indicated by arrow B against the spring force of the latch bolt adjustment spring 19 and becomes embedded in the front plate 12.

[0030] As a result, when the door 1 is closed, the latch bolt 14 fits into a latch hole in a door frame (not shown), and this state is maintained.

[0031] In addition, the support core 18 slides in the direction indicated by arrow B against the spring force of the latch bolt adjustment spring 19 in conjunction with the rotation of the rotating part 17 in the direction indicated by arrow y1 due to the rotation operation of the outer door knob 31 or the inner door knob 34 (see Figure 1) in the direction indicated by arrow y, via a gear mechanism (not shown) provided between the rotating part 17, and embeds the latch bolt 14 in the front plate 12.

[0032] As a result, even when the door 1 is closed, the latch bolt 14 is pulled out of the latch hole of the door frame (not shown), allowing the door 1 to be opened.

[0033] In addition, the rotating part 17 is provided with a rotating protrusion 17P which is integral with the peripheral portion on the side facing the upper space of the device case 11, extends outward from the rotation center of the rotating part 17 (the central axis of the square core hole 17h) and rotates (arrow x2 or y2) together with the rotation of the rotating part 17 (arrow x1 or y1).

[0034] A momentary switch 20 is provided in the space above the device case 11, corresponding to the position reached by the tip of the rotating protrusion 17P as it rotates in the direction indicated by arrow y2 in response to the rotation of the outer door knob 31 or the inner door knob 34 (see Figure 1) in the direction indicated by arrow y.

[0035] In the embodiment, the momentary switch 20 is attached to the second side surface (bottom surface) 11b of the device case 11. The momentary switch 20 is attached so that, in response to a rotation operation of the outer door knob 31 or the inner door knob 34 (see FIG. 1) in the direction indicated by the arrow y, the tip of the rotating protrusion 17P rotates in the direction indicated by the arrow y2 to a position where it reaches, as shown in FIG. 3, and the tip of the rotating protrusion 17P abuts against the position and turns the switch ON, and when the tip of the rotating protrusion 17P rotates in the direction indicated by the arrow x2 and returns, as shown in FIG. 2, the switch turns OFF <switch mechanism>.

[0036] An alarm issuing device 16 is provided in the space above the device case 11. In this embodiment, the alarm issuing device 16 is a device that generates a loud beep (electronic sound), and is attached to the back side of the front plate 12. When the momentary switch 20 is turned ON, the alarm issuing device 16 is driven by the battery power source of the power supply unit 21, and outputs a warning sound ES from an alarm issuing unit (speaker) 16S.

[0037] The power supply unit 21 is attached to the third side surface (rear surface) 11c of the device case 11, and is configured to have replaceable batteries. Voltage supply lines (+) 22a, 22b and a voltage supply line (-) 22c from the power supply unit 21 are connected to a power supply terminal (not shown) of the alarm issuing device 16 via a momentary switch 20, which is conductive when the switch 20 is ON and cut off when the switch 20 is OFF.

[0038] Next, the operation of the doorknob-mounted alarm device 10 of the embodiment when it is incorporated into the door 1 will be described.

[0039] Here, it is assumed that the door knob-mounted alarm device 10 is attached to a door 1 at a construction site where some construction work, such as electrical equipment construction, is being carried out. It is also assumed that a worker A is working directly in front of the outside of the door 1 while the door 1 is closed.

[0040] In the doorknob-integrated alarm device 10, when the door 1 is closed, as shown in FIG. 2, the support core 18 of the latch bolt 14 is urged in the direction indicated by arrow A by the spring force of the latch bolt adjustment spring 19, causing the latch bolt 14 to protrude from the front plate 12, thereby maintaining the door 1 in the closed state.

[0041] At this time, the rotating part 17 is urged in the direction indicated by the arrow x1 by the latch bolt adjustment spring 19 via a gear mechanism (not shown) provided between the rotating part 17 and the support core 18, and the rotating protrusion 17P is also urged in the direction indicated by the arrow x2, thereby maintaining the momentary switch 20 in the OFF state.

[0042] For example, when worker B, who is on the inside of door 1 and separate from worker A who is working just in front of the outside of door 1, attempts to open door 1 for work purposes by rotating the inside doorknob 34 in the direction shown by arrow y, the rotating part 17 of the doorknob-integrated alarm device 10 is rotated in the direction shown by arrow y1 via the square core 32, as shown in Figure 3, and the rotating protrusion 17P of the rotating part 17 presses the momentary switch 20 as shown by arrow y2.

[0043] Then, the momentary switch 20 turns ON, the power supply lines (+) 22a, 22b from the power supply unit 21 become conductive, and power is supplied to the alarm issuing device 16. Then, the alarm issuing device 16 outputs an alarm sound (for example, "beep!!") ES from the alarm issuing unit (speaker) 16S to warn that the door 1 is about to be opened.

[0044] This allows worker A working just in front of door 1 to know that door 1 is about to be opened by another worker B before door 1 is actually opened, and he can take action to avoid danger, such as moving out of the area where door 1 is opening or knocking on door 1 to let worker B know that he is working just in front of door 1.

[0045] Therefore, according to the embodiment, a doorknob-integrated alarm device 10 can be provided that is capable of issuing an alarm in response only to an operation attempting to open the door 1, without being attached to the outside of the door 1 or the doorknobs 31, 34.

[0046] According to the embodiment of the doorknob-built-in alarm device 10, it is possible to issue an alarm only in response to the operation of opening the door 1, which solves the following problems: unlike conventional magnetic switch type door alarm devices, the alarm is issued only after the door is opened, shortening the time for workers near the door to recognize the danger; unlike conventional contact sensor type door alarm devices, the alarm may not be detected correctly at construction sites where workers wear protective gear such as gloves; and unlike conventional proximity sensor type door alarm devices, the alarm may be issued excessively at doors with a large number of people entering and exiting.

[0047] The doorknob-integrated alarm device 10 can be easily used by simply installing the device case 11 in place of the existing doorknob body case (not shown) on the door 1. Therefore, when work on the site is completed due to completion of construction or the like, the device can be easily returned to the original doorknob body case and can be easily carried and used at other sites.

[0048] In the embodiment of the doorknob-built-in alarm device 10, the rotating protrusion 17P of the rotating part 17, which is linked to the rotation of the doorknobs 31, 34, mechanically presses the momentary switch 20, causing the alarm device 16 to obtain electrical conductivity and output a warning sound ES. However, the present invention is not limited to this, and any configuration may be used as long as the mechanical movement caused by the rotation of the doorknobs 31, 34 is converted into electrical conductivity in the alarm device 16.

[0049] In addition, the doorknob-embedded alarm device 10 of the embodiment has been described as a case in which, when the doorknobs 31, 34 are rotated in the direction indicated by the arrow y, the rotating part 17 rotates in the direction indicated by the arrow y1, causing the latch bolt 14 to sink into the front plate 12, thereby enabling the door 1 to be opened. However, this is not limited to the above, and even if the latch bolt 14 is protruded by the spring force of the latch bolt adjustment spring 19 and the latch bolt 14 is kept neutral in rotation of the doorknobs 31, 34, and the door 1 is opened when the doorknobs 31, 34 are rotated in either the direction indicated by the arrow x or the arrow y, causing the latch bolt 14 to sink into the front plate 12, it is of course possible to provide a mechanism for pressing down the momentary switch 17 in conjunction with the rotation of the doorknobs 31, 34, thereby enabling the door 1 to be opened.

[0050] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0051] 1...door, 10...doorknob-integrated alarm device, 11...device case, 12...front plate, 13a, 13b...device case mounting screws, 14...latch bolt, 15...deadbolt, 16...alarm device, 16S...alarm unit (speaker), 17...rotating unit, 17h...square core hole, 17P...rotating protrusion, 18...latch bolt support core, 19...latch bolt adjustment spring, 20...momentary switch, 21...power supply unit, 22a to 22c...power supply line, ES...warning sound, 31...outer doorknob, 32...square core <core member>, 34...inner doorknob, 34h...square core hole.

Claims

1. A front plate attached to the end surface of the opening side of the door; a device case provided on the rear side of the front plate and having a space through which a core member that rotates in response to rotation of the doorknob passes; a latch bolt adjustment mechanism provided inside the device case and configured to cause a latch bolt to protrude or retract from the front plate in response to rotation of the core member; an alarm device provided inside the device case and configured to output an alarm sound in response to a power supply; a power supply unit provided inside the device case and configured to supply power to the alarm device via a power supply line; a switch mechanism that turns on the power supply line in response to the movement of the core member in a direction in which the latch bolt is embedded in the front plate in response to the rotation of the doorknob, and cuts off the power supply line in response to the movement of the core member in a direction in which the latch bolt is protruding from the front plate, The core member is a square core that is attached across a pair of the doorknobs that are attached to one surface and the other surface of the door, The latch bolt adjustment mechanism includes a rotating part having a square core hole into which the square core is inserted, The switch mechanism turns on the power supply line in response to rotation of the pivot part in a direction in which the latch bolt is embedded in the front plate in response to rotation of the doorknob, and cuts off the power supply line in response to rotation of the pivot part in a direction in which the latch bolt is protruded from the front plate. Doorknob built-in alarm device.

2. The rotating portion has a rotation protrusion provided on a peripheral portion around which the rotating portion rotates, The switch mechanism has a momentary switch provided corresponding to a position where the pivot protrusion reaches in conjunction with the rotation of the pivot part in a direction in which the latch bolt is embedded in the front plate in response to the rotation of the doorknob, and the pivot protrusion presses the switch of the momentary switch to make the power supply line conductive.

2. The doorknob-mounted alarm device according to claim 1.

3. The alarm device has an alarm unit having a plurality of sound holes exposed on the front plate, and outputs the warning sound through the sound holes.

3. The doorknob-mounted alarm device according to claim 1 or 2.

4. The power supply unit is a battery power supply, and is configured to be battery replaceable.

4. The doorknob-mounted alarm device according to claim 1.

5. The device case and the front plate are attached to the door in place of a main body case and a front plate of a doorknob already installed on the door.

5. The doorknob-mounted alarm device according to claim 1.

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