JP4553756B2 - Door guard - Google Patents

Description

  The present invention relates to a door guard that can prevent an unauthorized person from entering illegally by limiting the opening to a predetermined angle.

  This type of door guard includes an arm whose base end is attached to the inner surface of the door so as to rotate in a substantially horizontal direction, and an arm locking tool attached to the door frame to lock the arm. The arm is formed in a substantially U shape as a whole, so that a slit extends along the longitudinal direction at the center in the vertical direction so that the bent side becomes the distal end side and the opening side becomes the proximal end side. It is pivotally supported on the inner surface. Also, the arm locking tool has a locking projection with a huge head, and the upper and lower arms of the arm are partially separated further vertically at the base end so that the head can be inserted. Thus, an introduction port that is communicated with the slit and wider than the slit is formed at the base end portion of the arm.

  Then, when the arm is raised from the normal position substantially along the inner surface of the door toward the door frame side by a predetermined angle to be the guard position, the door frame is directed toward the door side, that is, in the opening of the door frame where the door is installed. The locking projection of the arm locking tool that is projected substantially horizontally toward the direction is inserted into the introduction port of the arm. That is, the locking projection is positioned between the upper and lower arms of the arm, and the arm and the locking projection are superposed vertically.

  When the door is opened after the arm is set at such a guard position, the locking projection enters the slit from the introduction port and relatively moves in the slit toward the distal end side of the arm. When the locking projection enters the slit, the head locks the upper and lower arms of the arm from the inside to prevent the return to the normal position. And if a door opens to a predetermined angle, a latching protrusion will contact | abut the front-end | tip part (stopper part) of an arm, and, thereby, the door more than the angle will be blocked.

  By the way, in recent years, such door guards are required to be reduced in size and weight. Specifically, in the conventional door guard, the cross section of the arm has a substantially square shape or a substantially oval shape. Therefore, the height of the arm locking device is inevitably high, and the height of the arm locking device is high. There is a risk that the baggage may hit the arm locking device or hook clothes when a baggage is taken in or out of the room.

  Furthermore, when the arm is heavy and the door is closed strongly when a person goes out of the room, the arm rises from the normal position due to the impact of the collision between the door and the door frame, and the door guard operates unintentionally. There is a risk that a so-called lockout state may occur in which the user cannot enter the room again. (See Patent Document 1 below)

  For this reason, there is a structure in which the arm cross-section is formed in a substantially concave shape to reduce the weight of the arm, and the height of the arm locking portion is reduced by reducing the thickness of the slit portion of the arm.

  However, in the door guard with the back surface of the arm formed in a substantially concave shape as described above, an illegal intruder or visitor is in a state in which the door guard is operated, that is, in a state in which the door opening is limited to a predetermined angle to prevent unauthorized entry of an unnecessary person. When the door is suddenly opened or strongly opened by the arm, the arm thickness is thin, so that the arm distal end side strongly collides with the arm locking tool, causing the arm distal end side to be deformed or damaged. There was a fear.

Japanese Utility Model Publication No. 6-25482

  Therefore, the present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a door guard that can prevent deformation and breakage of an arm even when the door is suddenly opened or strongly opened.

In order to solve the above-mentioned problem, the invention according to claim 1 is provided in any one of the door frame and the door, and the arm having a concave section connected to the door or the door frame so as to be rotatable in a substantially horizontal direction. An arm locking tool attached to the arm, the arm is provided with an insertion / removal hole and a guide groove connected to the insertion / removal hole, and a head bulges at the tip of the arm locking tool. When the door is opened in a state of being rotated by a predetermined angle toward the arm locking device side, the arm locking device enters the guide groove, the arm moves relatively, and the stopper portion of the arm locks the arm locking device. In the door guard in which further opening of the door is prevented by abutting against the tool, a rib is provided on the back surface of the stopper portion of the arm in a direction substantially perpendicular to the relative movement direction of the arm , and the end surface of the rib together with the stopper portion characterized by being into contact with the said arm locking device Agado.

According to the first aspect of the present invention, the arm (4) having a concave section connected to either the door (2) or the door frame (1) so as to be rotatable in a substantially horizontal direction, and the door frame (1 ) Or an arm locking tool (3) attached to either the door (2), and the arm (4) has an insertion / removal hole (12) and a guide groove connected to the insertion / removal hole (12). (13) is provided, and a head (3a) is formed bulging at the tip of the arm locking tool (3), and the arm (4) is rotated by a predetermined angle toward the arm locking tool (3). When the door is opened in such a state, the arm locking tool (3) enters the guide groove (13) and the arm (4) moves relative to the stopper (7) of the arm (4). In the door guard in which further opening of the door is prevented by coming into contact with the arm locking tool (3), the back surface (14) of the stopper portion (7) of the arm (4) The relative movement direction substantially perpendicular direction of the arm (4) provided with ribs (8), since the end face of the rib (8) (8a) is in so that to contact to the arm locking device together with the stopper portion The arm (4), which is heavy due to the impact of the collision between the door (2) and the door frame (1), rises from the normal position due to inertia and prevents the door guard from operating unintentionally. Even when the arm locking tool (3) collides with the stopper portion (7) of the arm (4) due to sudden opening or strong opening, it is possible to prevent the arm from being deformed or damaged by impact.

  The best mode for carrying out the invention will be described below with reference to the drawings.

<Embodiment>
1 to 6 are views showing an embodiment of a door guard according to the present invention. In the figure, hatching indicating a cross section of the figure is omitted.

  As shown in FIGS. 1 and 2, the door guard is attached to the door frame 1 and the arm 4 connected to the door 2 for opening outward through two shafts 6 and 6 so that the door guard can be turned upside down. Arm locking tool 3 provided. Each of the shafts 6 and 6 is provided with a retaining means (not shown), and the arm 4 is rotatably attached to the base portion 9.

  The arm 4 is a U-shaped member made of a metal material, and includes two rails 4a and 4b extending in parallel and a closing piece 4c for closing one end of the two rails 4a and 4b, as shown in FIG. . The arm 4 is disposed on the inner surface 2a of the door 2 so that the two rails 4a and 4b extend vertically and extend horizontally.

  As shown in FIGS. 1 and 2, the base portion 9 is fixed on the inner surface 2 a of the door 2 by screws 15, and two rails 4 a of the arm 4 are attached to upper and lower arm pieces 9 a and 9 b of the base portion 9. The other end of 4b is rotatably supported by the two shafts 6 and 6, so that the arm 4 can be rotated with respect to the base portion 9, and can be tilted on the inner surface 2a of the door 2. ing. The shafts 6 and 6 are arranged on the arm pieces 9a and 9b, respectively. However, the other end of the rails 4a and 4b and the arm pieces 9a and 9b are held by one pivot and the arm 4 is rotated to the base portion 9. It can also be mounted movably. Further, the means for integrating the arm 4 and the base portion 9 may be other means. For example, the arm 4 and the base portion 9 may be integrated by a screw.

  A click stop mechanism is provided between the arm 4 and the base portion 9 for positioning the arm 4. That is, a steel ball 10 urged by a coil spring (not shown) is built in the base portion 9 toward the outer peripheral surface of the shaft 6, and the outer peripheral surface 11 at the other end of the rail 4 b is engaged with the steel ball 10. The concave shape 11b is provided, and the arm 4 can be held at the raised position and the inverted position by engaging the steel ball 10 and the concave shape 11b. In this embodiment, the click stop mechanism is provided on the other end side of the rail 4b. However, the click stop mechanism may be provided on the other end side of the rail 4a, or may be provided on the other end sides of the rail 4a and the rail 4b. Is possible. In addition, by providing a plurality of concave shapes at predetermined positions on the outer peripheral surface, the arm can be held at a plurality of positions and postures at predetermined angles.

  The arm 4 is connected to an insertion / removal hole 12 through which the arm locking tool 3 is inserted / removed by the rotation of the arm 4 in the closed state, and an insertion / removal hole 12 which slides the arm locking tool 3 to the stop position when the door is opened. A guide groove 13 is provided.

  The insertion / removal hole 12 is formed on the arm locking tool 3 side of the arm 4. Specifically, it is formed between the two rails 4a and 4b in the arm 4 and at a location close to the base portion 9 side. The head 3a in which the arm locking tool 3 swells can be inserted into and removed from the insertion / removal hole 12.

  The guide groove 13 is formed between the two rails 4 a and 4 b of the arm 4 so as to extend from the insertion / removal hole 12 toward the closing piece 4 c and is formed with a width smaller than that of the insertion / removal hole 12.

  As shown in FIGS. 1 and 2, the arm locking tool 3 protrudes from the door frame 1 along the inner surface 2 a of the door 2, and a head 3 a bulges at the tip. The head 3 a is smaller than the opening of the insertion / removal hole 12, and when the arm 4 is raised or tilted on the inner surface 2 a of the door 2 in the closed state, the head 3 a enters or leaves the insertion / removal hole 12 of the arm 4. Further, the head 3a is larger than the width of the guide groove 13, and after the arm locking tool 3 enters the guide groove 13, the arm 4 cannot be tilted on the door 2.

  In the stopper portion 7 of the arm 4, a rib 8 is provided on the back surface 14 in a direction substantially perpendicular to the relative movement direction of the arm 4 with the width of the guide groove 13, and the door 2 opens to the maximum position when the door guard is activated. The arm locking device 3 and the end surface 8a of the rib 8 come into contact with each other, and the door is suddenly opened or strongly opened, so that the arm locking device 3 collides with the stopper portion 7 of the arm 4. Even in this case, deformation or breakage of the arm due to impact can be prevented. The rib 8 is not limited to the width of the guide groove 13, and the width direction and the height direction can be arbitrarily set within a range that does not affect the appearance of the arm 4.

  Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments.

It is a front view of the Example of this invention. It is plane sectional drawing of the Example of this invention. In FIG. 1, it is AA sectional drawing. It is a side view of the state which raised the arm in the Example of this invention. In FIG. 4, it is BB sectional drawing. It is BB sectional drawing of the state which operated the door guard of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Door frame 2 Door 3 Arm locking tool 4 Arm 5 Arm front end side 6 Axis 7 Stopper part 8 Rib 9 Base part 10 Steel ball 11 Outer peripheral surface 12 Insertion / removal hole 13 Guide groove 14 Back surface

Claims (1)

It includes a recessed cross section of an arm which is pivotally connected in a substantially horizontal direction to either the door or door frame, a door frame or arm locking device attached to one of the door, to the arm An insertion / removal hole and a guide groove connected to the insertion / removal hole are provided, a head bulges at the tip of the arm locking tool, and the arm is rotated by a predetermined angle toward the arm locking tool. When the door is opened, the arm locking tool enters the guide groove, the arm moves relatively, and the stopper portion of the arm abuts against the arm locking tool to prevent further opening of the door. In the door guard, a rib is provided on the back surface of the stopper portion of the arm in a direction substantially perpendicular to the relative movement direction of the arm, and an end surface of the rib is in contact with the arm locking tool together with the stopper portion. Door guard.

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