JP3194889U - Door guard release prevention device - Google Patents

Abstract

There is a malicious technique in which a lock guard is locked by a lock projection and a door guard that restricts opening of the door is unlocked by releasing the lock arm by an operation from the outside of the door. Provided is a door guard release prevention tool for preventing door guard release by such a malicious technique. As a door guard release prevention tool, a notch groove 4-3 that guides and introduces a neck portion of a locking projection in a state where a lock arm 25 is locked and an engagement recess portion 4 that engages the guided neck portion. 5 and at least a front side portion 4 and a first side piece portion 2 and a second side piece portion 3 that are provided so as to be slidable while holding the lock arm from the side. provide. If this door guard release prevention tool 1 is attached to the locking projection on which the lock arm 25 is locked, the lock arm cannot be rotated and removed, so that it is possible to prevent the release by the malicious trick. [Selection] Figure 3

Description

The present invention relates to a door guard release prevention tool for preventing the door guard from being released from outside the entrance by a thief or the like.

Door guards are often applied to entrance doors. The door guard is composed of a metal fitting forming a locking projection and a metal fitting forming a lock arm, and one of the metal fittings is attached to the door and the other metal fitting is attached to the door frame.
When the lock arm is locked to the locking protrusion, the door is opened only in a predetermined narrow range. Therefore, it is possible to prevent the intrusion of a suspicious person such as a thief while making it possible to respond while checking the face of the visitor. Also, by keeping the door a little open, it is possible to ventilate from there.

Next, the door guard and its usage will be described in detail.
FIG. 6 is a view showing the door guard in an unlocked state. In FIG. 6, 8 is a door frame, 9 is a door, 10 is a locking projection, 11 is a mounting base, 12 is a screw, 13 is a protruding neck, 14 is a protruding head, 20 is a lock arm, and 21 is a mounting base. , 22 is a screw, 23 is a bearing body, 24 is a shaft, 25 is a lock arm, 26 is a distal end portion, 27 is a proximal end portion, 27-1 is an inclined portion, 28 is an expanding portion, and 29 is a guide groove. A is the height of the lock arm 25 in the vertical direction, B is the width of the lock arm 25, and C is an arrow.
Here, an example is shown in which the locking projection 10 is attached to the door frame 8 side and the lock arm 20 is attached to the door 9 side.

The locking projection 10 is composed of a flat mounting base 11, a projection neck 13 planted in the center thereof, and a projection head 14 formed at the tip of the projection neck 13. That is, the locking projection is composed of the projection neck 13 and the projection head 14. The attachment base 11 is attached to the door frame 8 with screws 12.
The lock arm portion 20 includes a flat mounting base 21 and a lock arm 25. The attachment base 21 is attached to the door 9 with screws 22. Two bearing bodies 23 are planted on the surface of the mounting base 21 at intervals. The lock arm 25 has an elongated U-shape as a whole, 26 is a distal end portion thereof, and 27 is a proximal end portion thereof. A part of the base end portion 27 is an inclined portion 27-1, and the widened portion 28 is formed between the base ends by slightly increasing the interval between the base ends. The two base end portions 27 are pivotally supported on the bearing body 23 by shafts 24 and are freely rotatable.
Since FIG. 6 shows the door guard in an unlocked state, the lock arm 25 is rotated to a position along the wall surface on the side where the lock arm 25 is attached (door 9 side). It is not locked to the stop projection 10.

FIG. 7 is a diagram showing the door guard in the first stage when locking. In this stage, with the door 9 closed, the lock arm 25 is rotated in the direction indicated by the arrow C in FIG. 6, and the side on which the locking projection 10 is attached (in this case, the door frame 8 side). It is a stage where it is moved to a position along the wall surface. At this stage, the projecting head 14 of the locking projection 10 protrudes from the space of the expanded portion 28 of the lock arm 20.
FIG. 8 is a diagram showing the door guard in the second stage when locking. Reference numerals correspond to those in FIG. 6, and 30 is a gap formed between the door 9 and the door frame 8 when the door 9 is opened. This stage is a stage in which the door 9 is slowly opened while keeping the projection neck 13 in the guide groove 29 with the projection head 14 of the locking projection 10 protruding outside the guide groove 29. . At this time, the protruding head 14 moves toward the tip 26 along the lock arm 25.

FIG. 9 is a diagram showing the door guard in the third stage when locking. This stage is a stage in which the door 9 is opened to the limit that can be opened with the lock arm 20 engaged with the locking projection 10. The protruding head 14 is moved to the tip 26 of the lock arm 25.
The size of the gap 30 that can be made at this time allows the necessary ventilation through the entrance, and also allows you to respond and deliver documents while checking the face of the visitor, but people can enter The size is not possible.

JP-A-9-004304 JP 2011-208437 A

The door guard as described above has a problem that it can be easily released by a thief who knows a special trick.
There are two cases where the door guard is broken. In the first case, as shown in FIG. 9, a strong metal cutting instrument is inserted from the gap 30 while the door guard is hung, and the lock arm 25 is physically cut. In this case, the door guard is naturally destroyed and invaded by a thief.

The second case is a case where the door guard is operated from the outside of the door without being physically destroyed, and the lock arm is removed (released) from the locking projection. Explaining this special technique in detail here will explain the technique of the thief in detail, which is contrary to public order and morals. Therefore, I refrain from staying here.
However, if you do not explain anything, you will not understand the problem. First, a special operation is performed in the state of FIG. 9, and then the locking projection is set to the initial position (in the expanded portion 28) (see FIG. 7). Next, the lock arm 25 is rotated in a direction away from the locking projection (arrow D in FIG. 7).
An object of the present invention is to solve the problem that the door guard is released without being destroyed by a person outside the door as in the second case.

  In order to solve the above-mentioned problems, in the present invention, a lock arm is used as a door guard release prevention tool for preventing the door guard from being released by locking the lock arm to the locking projection so that the door is opened only within a predetermined range. A notch groove (4-3) for guiding and introducing the projection neck (13) of the locking projection in a state where the projection is locked, and an engagement recess (4-5) for engaging with the guided neck (13) And a first side piece (2) provided along the upper side of the front portion so as to be slidable in the form of being held from the side of the lock arm together with the front portion. It was decided to provide a door guard release prevention tool characterized by comprising a second side piece (3) provided along the lower side.

  Further, as a door guard release prevention tool for preventing the door guard from being released so that the door can be opened only within a predetermined range by engaging the lock arm with the engagement protrusion, the front portion (4) described below. And a door guard release prevention tool comprising the first side piece (2) and the second side piece (3).

That is, the front portion (4) includes a substantially rectangular flat plate body (4-1) and a first leg extending linearly in the lateral direction along the upper side of the flat plate body (4-1). A notch groove provided in parallel with the first leg piece (4-2) having a width larger than the diameter of the neck of the piece (4-2) and the locking projection but smaller than the diameter of the head thereof (4-3) and an engagement recess (4-5) provided to bite into the first leg piece (4-2) side and engage the neck at the innermost part of the notch groove (4-3) ) And a second leg piece (4-4) provided in parallel with the first leg piece (4-2) across the notch groove (4-3).

The first side piece (2) is provided along the upper side of the front portion (4), in a direction perpendicular to the front portion (4) and with a width slightly larger than the width of the lock arm upper surface. (2-1) and a first claw piece (2-2) provided downward on the free end side of the first side piece (2-1).
The second side piece (3) is parallel to the first side piece (2-1) at a portion of the lower side of the front portion (4) except for the second leg piece (4-4). The second side piece (3-1) provided to have the same width and the upward side so as to face the first claw piece (2-2) on the free end side of the second side piece (3-1). And a second claw piece (3-2) provided.

  Further, in the door guard release prevention device described above, the range in which the first side piece portion (2) is provided extends from the flat main body 4-1 to the first leg piece (4-2) along the upper side of the front portion (4). It may be up to an intermediate position.

  If the door guard release prevention device of the present invention is engaged with the protrusion neck portion of the locking projection that is locked with the door guard lock arm, it is possible to prevent the lock arm from rotating in the direction of releasing. Therefore, even if you try to remove the lock arm using a special trick from outside the door, the door guard will not be released.

The perspective view of the door guard release prevention tool concerning this invention The figure which shows the door guard release prevention tool concerning this invention The figure which shows the situation just before mounting of the door guard release prevention tool The figure which shows the situation at the time of completion of installation of a door guard release prevention tool The figure which shows the situation of the door guard release prevention tool when the door is closed a little Figure showing the door guard in an unlocked state The figure which shows the door guard in the 1st step at the time of locking The figure which shows the door guard in the 2nd step at the time of locking The figure which shows the door guard in the 3rd step at the time of locking

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of a door guard release prevention device according to the present invention. In FIG. 1, 1 is a door guard release prevention tool, 2 is a first side piece, 2-1 is a side piece, 2-2 is a claw piece, 3 is a second side piece, 3-1 is a side piece, 3- 2 is a claw piece, 4 is a front portion, 4-1 is a flat body, 4-2 is a first leg piece, 4-3 is a notch groove, 4-4 is a second leg piece, and 4-5 is an engaging recess. Reference numeral 5 denotes a stepped portion.
The door guard release prevention tool 1 is made of a thin plate-like body (eg, metal plate), and has a plate-like rectangular front part 4 as a whole, a first side piece part 2 provided along the upper side, and a lower side. And the second side piece 3 provided along the line.

The front portion 4 is formed by a flat plate-shaped main body 4-1, a first leg piece 4-2, a notch groove 4-3, a second leg piece 4-4, and the like. The length in the vertical direction (vertical direction) of the flat plate-like body 4-1 is slightly larger than the height A (see FIG. 6) in the vertical direction of the lock arm 25.
The 1st leg piece 4-2 is linearly extended along the upper side in the horizontal direction (right horizontal direction in FIG. 1) of the flat main body 4-1. The notch groove 4-3 is a groove provided linearly in parallel with the first leg piece 4-2, and its width is larger than the diameter of the projection neck of the locking projection of the door guard, The width is smaller than the diameter. The engagement recess 4-5 is a recess provided so that the projection neck portion of the locking projection engages so as to bite into the first leg piece 4-2 side of the innermost portion of the notch groove 4-3. The second leg piece 4-4 is provided in parallel with the first leg piece 4-2 with a notch groove 4-3 therebetween. The step portion 5 is a step formed between the second leg piece 4-4 and the lower side of the flat plate-like body 4-1.

The first side piece 2 includes a side piece 2-1 and a claw piece 2-2 and is provided along the upper side of the front portion 4. However, since the tip of the first leg piece 4-2 becomes the tip when inserted into the door guard, the side piece 2-1 along the first leg piece 4-2 has a first leg for easy insertion. Instead of providing up to the tip of the piece 4-2, it may be fixed up to an intermediate position as needed (FIG. 1 shows an intermediate position).
The side piece 2-1 is provided in a direction perpendicular to the front portion 4 and with a width slightly larger than the lock arm width (width B in FIG. 6) of the door guard. The claw piece 2-2 extends downward on the free end side of the side piece 2-1. The width is a width that can be locked to the side surface of the lock arm 25.

  The second side piece 3 includes a side piece 3-1 and a claw piece 3-2, and is provided along a portion of the lower side of the front portion 4 excluding the second leg piece 4-4. . The side piece 3-1 is provided to be parallel to the side piece 2-1 and to have the same width. The claw piece 3-2 extends upward so as to face the claw piece 2-2 on the free end side of the side piece 3-1.

FIG. 2 is a view showing a door guard release preventing device according to the present invention. The reference numerals correspond to those in FIG. 1, E is the internal height, and F is the internal width. 2 (1) is a front view, (2) is a left side view, (3) is a top view, (4) is a back view, (5) is a right side view, and (6) is a bottom view. .
As shown in FIG. 2 (2), the internal height E is the internal height of the door guard release prevention device 1, and this height (approximately equal to the length of the front portion 4 in the vertical direction) is the lock arm of the door guard. Slightly larger than High A (see FIG. 6). The internal width F is the internal width of the door guard release prevention device 1 as shown in FIG. 2 (5) (this is substantially equal to the width of the side piece 2), and this width is slightly larger than the lock arm width B of the door guard. Make it big.
The reason for doing so is that the door guard release prevention device 1 of the present invention introduces the lock arm 25 into the inside from its tip end portion 26 and attaches the lock arm 25 from the side. This is because it is slidable. In other words, the door guard release prevention tool 1 is used by covering the tip of the lock arm.

Next, the point of attachment of the door guard release preventing tool 1 will be described.
FIG. 3 is a view showing a situation immediately before the door guard release preventing device is mounted, and the reference numerals correspond to those in FIGS. The right half of FIG. 3 shows the vicinity of the tip of the lock arm 25 that is locked to the locking protrusion 10. In the door guard release prevention tool 1, the first leg piece 4-2 and the second leg piece 4-4 are directed toward the locking projection 10.

Installation is performed in the following order.
(1) The door guard release prevention tool 1 is advanced toward the distal end portion 26 of the lock arm 25 as indicated by an arrow G, and the projection neck portion 13 (not shown in FIG. 3 but see FIG. 8) of the locking projection portion 10 is moved. The first leg piece 4-2 and the second leg piece 4-4 are inserted so as to be led into the notch groove 4-3.
(2) The door guard release prevention tool 1 is moved forward as it is, and the lock arm 25 is received in the door guard (in other words, the guard release prevention tool 1 is put on the lock arm 25).
(3) When the projection neck 13 hits the back of the notch groove 4-3 and the forward movement of the door guard release prevention device 1 is stopped, the door guard release prevention device 1 is lowered and the projection neck 13 is engaged with the engagement recess 4- 5 is engaged. This completes the mounting.
FIG. 4 is a diagram illustrating a situation when the installation of the door guard release prevention tool is completed.

Next, why the release can be prevented if the door guard release prevention tool 1 is attached will be described.
To release the door guard by a special technique, the door 9 is closed from the state where the lock arm 25 is locked to the locking projection and the door 9 is opened to the maximum (FIG. 9). Returning to the state 7, the lock arm 25 is rotated as shown by the arrow D in this state. That is, as shown in FIG. 7, the operation is performed in a state where the protruding head 14 of the locking protruding portion 10 is returned to the expanded portion 28 of the lock arm portion 20.
Therefore, if it is possible to prevent the protruding head 14 from being returned to the expanded portion 28, the door guard can be prevented from being released. Alternatively, since there are various shapes of the lock arm portion 20 other than those shown in the drawings, the lock arm portion 25 may be returned to the expanding portion 28 depending on the shape, but even if it is returned, the lock arm 25 is moved to the arrow D. If it can be prevented that the door guard is rotated as described above, the release of the door guard can be prevented.
As will be described below, the door guard release preventing device 1 of the present invention prevents the protruding head 14 from returning to the expanded portion 28 or prevents the lock arm 25 from being removed even if it is returned. To prevent.

FIG. 5 is a diagram illustrating a state of the door guard release preventing tool when the door is slightly closed. When the door is slightly closed, the protrusion head 14 of the locking protrusion 10 moves along the guide groove 29 toward the base of the lock arm 20. The door guard release prevention tool 1 is engaged with a projection neck 13 (not shown in FIG. 5) of the locking projection 10, and includes a front portion 4, a first side piece 2, and a second side piece 3. Thus, the lock arm 25 is held from the side, so that it moves together with the locking projection 10 without falling off the lock arm 25.
Therefore, the installed door guard release prevention tool 1 gets in the way (for example, hits a part of the base end portion 27), and the locking projection 10 becomes the widened portion 28 (see FIG. 7) is prevented from moving to the position. Even if the door guard release preventing tool 1 is still mounted even if it is moved to the widened portion 28 due to the shape of the base end portion 27 and the like, the lock guard 25 is engaged with the locking projection 25 because it remains in the way. It cannot be rotated in the direction of removing from 10 (the direction of arrow D in FIG. 7). This prevents the door guard from being released.

As can be seen from the above explanation, the door guard can be prevented from being released by preventing the locking projection from being moved to the expanding portion 28 at the base of the lock arm 25 or even if the lock arm 25 is moved. Although it can be achieved only by preventing it from being rotated in the direction of disengagement, the present invention intends to achieve this.
For this purpose, even if the locking projection is moved left and right in the guide groove 29, the locking projection moves together while maintaining the engagement state with the locking projection, and the lock arm 25 is prevented from rotating wherever it moves. It is required to maintain the function to perform.
Therefore, after all, the door guard release prevention device of the present invention engages with the notch groove 4-3 for guiding and introducing the protruding neck portion 13 of the locking projection in the state where the lock arm is locked and the protruding and protruding neck portion 13 guided. Front part 4 having at least a concavity 4-5, and a first side piece provided along the upper side of the front part so as to be slidable in the form of being held from the side of the lock arm together with the front part 2 and the 2nd side piece part 3 provided along the lower side should just be provided.

DESCRIPTION OF SYMBOLS 1 ... Door guard cancellation | release prevention tool, 2 ... 1st side piece part, 2-1 ... Side piece, 2-2 ... Claw piece, 3 ... 2nd side piece part, 3-1 ... Side piece, 3-2 ... Claw piece DESCRIPTION OF SYMBOLS 4 ... Front part, 4-1 ... Flat body, 4-2 ... 1st leg piece, 4-3 ... Notch groove, 4-4 ... 2nd leg piece, 4-5 ... Engagement recessed part, 5 ... Step Part,
DESCRIPTION OF SYMBOLS 8 ... Door frame, 9 ... Door, 10 ... Locking projection part, 11 ... Mounting base, 12 ... Screw, 13 ... Projection neck, 14 ... Projection head, 20 ... Lock arm part, 21 ... Mounting base, 22 ... Screw , 23 ... Bearing body, 24 ... Shaft, 25 ... Lock arm, 26 ... Tip part, 27 ... Base end part, 28 ... Expanding part, 29 ... Guide groove, 30 ... Gap, A ... Lock arm height, B ... Lock Arm width, C, D ... arrow, E ... internal height, F ... internal width, G ... arrow

Claims (3)

A door guard release prevention tool for preventing the door guard from being released by locking the lock arm to the locking protrusion so that the door is opened only within a predetermined range,
A notch groove (4-3) that guides and introduces the projection neck (13) of the locking projection in a state where the lock arm is locked, and an engagement recess (4-5) that engages the guided neck (13). ) And at least a front part (4),
A first side piece (2) provided along the upper side of the front part and a second side piece provided along the lower side so as to be slidable alongside the front side of the lock arm. The door guard release prevention tool characterized by comprising the part (3).
A door guard release prevention tool for preventing the door guard from being released by locking the lock arm to the locking protrusion so that the door is opened only within a predetermined range,
It consists of a front part (4), a first side piece part (2) and a second side piece part (3) formed of a plate-like body,
The front part (4)
A substantially rectangular flat body (4-1);
A first leg piece (4-2) linearly extending laterally along the upper side of the flat plate-like body (4-1);
A notch groove (4-3) provided in parallel with the first leg piece (4-2) having a width larger than the diameter of the neck portion of the locking projection but smaller than the diameter of the head portion thereof;
An engagement recess (4-5) provided so as to bite into the first leg piece (4-2) side at the innermost part of the notch groove (4-3) and engage the neck portion;
A second leg piece (4-4) provided in parallel with the first leg piece (4-2) across the notch groove (4-3);

The first side piece (2) is
A first side piece (2-1) provided along the upper side of the front portion (4), at a right angle to the front portion (4) and slightly wider than the lock arm upper surface width;
A first claw piece (2-2) provided downward on the free end side of the first side piece (2-1);

The second side piece (3) is
The second side provided on the lower side of the front part (4) except for the second leg piece (4-4) so as to be parallel to and have the same width as the first side piece (2-1). Piece (3-1),
A configuration comprising a second claw piece (3-2) provided upward on the free end side of the second side piece (3-1) so as to face the first claw piece (2-2). Is

A door guard release prevention device characterized by
  The range in which the first side piece (2) is provided is from the flat body (4-1) to the middle position of the first leg piece (4-2) along the upper side of the front part (4). The door guard release prevention tool according to claim 1 or 2.

Images