JP3899063B2 - Door guard - Google Patents

Description

  The present invention relates to a door guard.

  As shown in FIGS. 12 and 13, the door guard includes an arm 3 rotatably connected to the door 1 via a pivot 2 and a protrusion 5 fixed to the doorway frame 4. An insertion / removal hole 6 that is inserted into and removed from the protrusion 5 in accordance with the turning operation of the arm 3 in the state, and a guide groove 7 that guides the protrusion 5 to the stop position when the door is opened are provided.

In order to lock the door guard, the arm 3 is erected on the inner surface of the door 1 in the closed state, and the protrusion 5 is inserted into the insertion / removal hole 6. When the door 1 is opened in this state, the guide groove 7 of the arm 3 slides on the protrusion 5 to the stop position. Thereby, the door 1 will be in a half-open state, and will not open any more. When the half-open door 1 is closed, the arm 3 slides in the reverse direction from the stop position and stops when the projection 5 reaches the insertion / removal hole 6. Therefore, when the arm 3 is tilted to the inner surface of the door 1, the projection 5 is detached from the insertion / removal hole 6, the door guard is unlocked, and the door 1 can be freely opened and closed (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 2-47369

  However, according to the conventional door guard, as shown in FIG. 12, when the door 1 is slightly opened, the locked arm 3 is tilted and the projection 5 is removed from the insertion / removal hole 6 to unlock the door guard illegally. There is a problem that it is possible to do.

  Therefore, an object of this invention is to provide the door guard which can eliminate the said malfunction.

In order to solve the above-mentioned problem, the invention according to claim 1 includes a bracket (13) fixed to the door (8) and an arm (10) rotatably connected to the bracket (13) via a pivot (9). 10) and a protrusion (12) attached to the entrance / exit frame (11), and the arm (10) is inserted / removed so that the protrusion (12) is inserted / removed by the rotation of the arm (10) in the closed state. A hole (18) and a guide groove (19) for guiding the protrusion (12) when the door is opened are provided . The protrusion (12) enters the insertion / removal hole (18) to be locked, and the insertion / removal hole (18 18) a slide guide means for allowing the arm (10) to slide in the door opening / closing direction when the door guard is in the unlocked state in the door guard in which the protrusion (12) is released from the unlocked state. Attach the arm (10) to one slide end An elastic body (15), a rotation preventing means for preventing the arm (10) from rotating to the unlocked state in a state where the arm (10) is biased to the one slide end, and an arm ( The rotation guide means that allows the arm (10) to rotate to the unlocked state when the other slide end is pushed against the urging force of the elastic body (15), and the bracket ( 13) and a door guard provided between the arm (10) .

  According to a second aspect of the present invention, in the door guard according to the first aspect, the rotation prevention means, the slide guide means, and the rotation guide means include a convex portion (21) common to each means and the convex portion ( 21) and an engaging groove (22) communicating with each other, and the engaging groove (22) is an arm (10) from the locked position to the unlocked position by engaging with the convex portion (21). Of the arm (10) when the arm (10) is slid in the locked state, and guides the convex part (21) after the slide of the arm (10) to unlock the arm (10). A door guard formed to allow rotation to a position is employed.

The invention according to claim 3 is the door guard according to claim 2, wherein the engagement groove (22) extends so as to intersect the pivot (9), and the first groove portion. The door guard provided with the 2nd groove part (22b) curved and extended centering around the pivot (9) from the end of (22a) is employ | adopted.
According to a fourth aspect of the present invention, in the door guard according to the second aspect, the convex portion (21) is formed as an angular shaft portion at both ends of the pivot (9) projecting from both sides of the arm (10), and is engaged. A groove (22) is formed in the bracket (13) as a sliding hole for the angular shaft portion, and this sliding hole communicates with a round hole portion (22c) that allows rotation of the angular shaft portion and the round hole portion (22c). The door guard provided with the square hole part (22d) which restrains so that the square-axis part formed in may not rotate may be employ | adopted.

According to the first aspect of the present invention, the bracket (13) fixed to the door (8), the arm (10) rotatably connected to the bracket (13) via the pivot (9), and the doorway A projection (12) attached to the frame (11), and the arm (10) has an insertion / removal hole (18) through which the projection (12) is inserted / removed by the rotation of the arm (10) in the closed state. And a guide groove (19) for guiding the projection (12) when the door is opened. The projection (12) enters the insertion / removal hole (18) to be locked, and the projection (12) protrudes from the insertion / removal hole (18). 12) is a door guard that is disengaged and is in an unlocked state. When the door guard is in a locked state, slide guide means that enables the arm (10) to slide in the door opening / closing direction; and the arm (10) Elastic body (15 Rotation preventing means for preventing the arm (10) from rotating to the unlocked state in a state where the arm (10) is urged to the one slide end, and the arm (10) is the elastic body. When the other slide end is pushed against the urging force of (15), the rotation guide means that allows the arm (10) to rotate to the unlocked state includes the bracket (13) and the arm ( 10) , when the door guard is in the locked state, the rotation of the arm (10) is blocked by the rotation blocking means, so that unauthorized unlocking is prevented. In order to change to the unlocked state, rotation to the unlocked position by the rotation guide means is not allowed unless the arm (10) is slid by the slide guide means. Is prevented.

  According to a second aspect of the present invention, in the door guard according to the first aspect, the rotation preventing means, the slide guide means, and the rotation guide means include a convex portion (21) common to each means and the convex portion ( 21) and an engaging groove (22) communicating with each other, and the engaging groove (22) is an arm (10) from the locked position to the unlocked position by engaging with the convex portion (21). Of the arm (10) when the arm (10) is slid in the locked state, and guides the convex part (21) after the slide of the arm (10) to unlock the arm (10). Since it is formed so as to allow the rotation to the position, the structure of the rotation preventing means, the slide guide means, and the rotation guide means, and thus the structure of the door guard, is reduced in size and simplified.

  According to the invention of claim 3, in the door guard of claim 2, the engagement groove (22) has a first groove portion (22a) extending so as to intersect the pivot (9), and a first groove portion. Since the second groove portion (22b) extending from the one end of (22a) around the pivot axis (9) is provided, the structure of the engagement groove (22) is simplified and can be easily processed. it can.

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

<Embodiment 1>
As shown in FIG. 1, the door guard includes an arm 10 that is pivotably connected to a door 8 for outward opening via a pivot 9, that is, a protrusion that is a locking member attached to an entrance / exit frame 11. 12.

  The arm 10 is a U-shaped member formed of a metal material or the like, and as shown in FIGS. 1 and 2, the two rails 10a and 10b extending in parallel and the one end of the two rails 10a and 10b are closed. And a piece 10c. The arm 10 is disposed on the inner surface 8a of the door 8 so that the two rails 10a and 10b extend vertically.

  As shown in FIGS. 1 and 2, the pivot 9 is supported by a bracket 13 fixed to the door 8. That is, the bracket 13 is fixed to the inner surface 8a of the door 8 by a set screw 14, and the pivot 9 is passed through the upper and lower arm pieces 13a, 13b of the bracket 13 to the other ends of the two rails 10a, 10b of the arm 10. Is passed vertically and supported. As a result, the arm 10 can turn on the horizontal plane with the pivot 9 as a fulcrum, and can be raised and lowered on the inner surface 8a of the door 8.

  As shown in FIGS. 1 and 2, a click stop mechanism is provided between the bracket 13 and the arm 10 for positioning the arm 10. The click stop mechanism includes a slide piece 16 embedded on the bracket 13 side through a compression coil spring 15 that is an elastic body, and a plurality of contact surfaces 17a and 17b formed in a polygonal shape on the arm 10 side that contacts the slide piece 16. , 17c. As shown in FIGS. 1 to 4, the slide piece 16 is slidable in a direction perpendicular to the pivot 9 and the inner surface 8 a of the door 8 from above the compression coil spring 15 in a guide hole 13 c formed in the bracket 13. Inserted. Accordingly, the arm 10 stops at a plurality of positions and postures at predetermined angles with respect to the door 8 as shown in FIGS. 7A, 7B, 8C, and 8D.

  As shown in FIGS. 1 and 2, the arm 10 has an insertion / removal hole 18 through which the projection 12 is inserted / removed by the rotation of the arm 10 in the closed state, and the insertion that slides on the projection 12 to the stop position when the door is opened. A guide groove 19 connected to the hole 18 is provided.

  The insertion / removal hole 18 is formed on the bracket 13 side of the arm 10. Specifically, it is formed between the two rails 10a and 10b in the arm 10 and at a place close to the bracket 13 side. The head portion 12a in which the protrusion 12 bulges can enter and leave the insertion / removal hole 18.

  The guide groove 19 is formed between the two rails 10 a and 10 b of the arm 10 so as to extend from the insertion / removal hole 18 toward the closing piece 10 c, and is formed with a width smaller than that of the insertion / removal hole 18.

  As shown in FIG. 1, the protrusion 12 protrudes from the entrance / exit frame 11 along the inner surface 8a of the door 8, and a head 12a bulges at the tip. The head portion 12a is smaller than the opening of the insertion / removal hole 18, and when the arm 10 is raised or tilted on the inner surface 8a of the door 8 in the closed state, the head 12a enters or leaves the insertion / removal hole 18 of the arm 10. Further, the head 12a is larger than the width of the guide groove 19, and after the projection 12 enters the guide groove 19, the arm 10 cannot be tilted on the door 8.

  This door guard prevents, for example, that the locked arm 10 is tilted when the door 8 is slightly opened and the projection 12 is removed from the insertion / removal hole 18 to improperly unlock the door 8. ) To prevent the arm 10 from rotating from the locked position where the projection 12 is inserted into the insertion / removal hole 18 shown in FIG. 8D to the unlocked position where the projection 12 is removed from the insertion / removal hole 18 shown in FIG. 7A and FIG. 7B, slide guide means that enables the arm 10 to slide in the locked state, and guides the rotation of the arm 10 from the locked position to the unlocked position as shown in FIG. 8C. And a rotation guide means that allows the rotation of the arm 10 to the unlocked position by the rotation guide means after releasing the rotation prevention by the rotation prevention means from the slide of the arm 10 by the slide guide means. It has become.

  The slide guide means is for guiding the arm 10 in the locked state shown in FIGS. 1 and 7A in a direction perpendicular to the pivot 9 and the inner surface 8a of the door 8. FIGS. As shown in FIG. 4, the long holes 20 formed in the arm pieces 13a and 13b of the bracket 13 are provided. The long hole 20 extends in a direction perpendicular to the pivot 9 and the inner surface 8 a of the door 8, and the pivot 9 attached to the arm 10 is inserted into the long hole 20. When the arm 10 is pushed from the locking position shown in FIGS. 1 and 2A toward the inner surface 8a of the door 8 against the urging force of the compression coil spring 15 of the click stop mechanism, the pivot 9 moves through the long hole 20. By sliding, the arm 10 slides toward the inner surface 8 a of the door 8. A similar function can be obtained by forming the long hole 20 of the bracket 13 on the arm 10 side, fixing the pivot 9 to the bracket 13 side, and sliding the arm 10 on the pivot 9.

  As shown in FIG. 2 to FIG. 5, the slide guide means includes a common convex portion 21 and an engaging groove 22 that communicates with each other and engages with the convex portion 21 together with the rotation prevention means and the rotation guide means. .

  As shown in FIGS. 2 to 4, the convex portion 21 protrudes on the opposing surface of the arm pieces 13 a and 13 b of the bracket 13 that faces the arm 10, and the engagement groove 22 is an arm as shown in FIG. 5. 10 is formed on the facing surface of the bracket 13 facing the arm pieces 13a and 13b. These opposing surfaces extend perpendicular to the pivot 9. Of course, the convex portion 21 and the engaging groove 22 may be interchanged between the arm pieces 13 a and 13 b and the arm 10.

  The engaging groove 22 prevents the arm 10 from rotating from the locking position shown in FIGS. 1 and 7A to the unlocking position shown in FIG. When the arm 10 is slid in the locked state as shown in (B), the convex portion 21 is guided, and after the arm 10 is slid, the convex portion 21 is guided as shown in FIGS. It is formed to allow rotation to a position.

  As shown in FIGS. 5, 7, and 8, the engagement groove 22 desirably has a first groove 22 a that extends so as to intersect the pivot 9, and a curve about the pivot 9 from one end of the first groove 22 a. And a second groove portion 22b extending.

  The first groove portion 22a is formed so as to extend in a direction perpendicular to the inner surface 8a of the door 8 and one contact surface 17a of the click stop mechanism when intersecting the pivot 9 when the arm 10 is in the locking position. Further, as shown in FIG. 7A, the first groove portion 22a has a second groove portion 22b when the arm 10 is in a locked state in which the pivot 9 is slid to the end of the long hole 20 by the urging force of the compression coil spring 15. Is formed so as to restrain the convex portion 21 at the adjacent portion.

  As shown in FIG. 7 (B), one end of the second groove portion 22b is formed so that the convex portion 21 is protruded from the first groove portion 22a when the arm 10 is slid toward the door 8 in the locked state. It is formed so as to be able to enter the groove 22b. Further, the other end of the second groove portion 22b communicates with the surface of the arm 10 as shown in FIG. 5, but the arm 10 is opened on the inner surface 8a of the door 8 as shown in FIG. 8D. Even when moved to the lock position, the convex portion 21 is formed so as not to be detached from the engagement groove 22.

  In addition, the door guard employs a pivot 9 attachment structure as shown in FIGS. 1, 2 (A) and 6. That is, in the conventional mounting structure shown in FIGS. 12 and 13, the E-type retaining ring 23 is fitted into the annular groove 2 a formed in the pivot 2 to prevent the pivot 2 from dropping off from the arm 3 or the like. However, conventionally, a gap A is formed between the E-type retaining ring 23 and the pivot 2, and by inserting a tool into this gap A, the E-type retaining ring 23 may be removed and the pivot 2 may be removed from the arm 10 or the like. is there. Therefore, in this door guard, as shown in FIGS. 1, 2A, and 6, an E-type retaining ring 24 that can be reduced to such an extent that the gap A does not occur or a tool cannot be inserted. Alternatively, an annular groove 9a into which the E-type retaining ring 24 is fitted is employed. In this embodiment, the E-type retaining ring 24 or the annular groove 9a is formed so that the concave edge 24a of the E-type retaining ring 24 enters the annular groove 9a of the pivot 9, so that the gap A is eliminated.

  Next, the operation of the door guard configured as described above will be described.

  The door guard is locked when the arm 10 is set at the position shown in FIGS. 1 and 7A.

  In this locked state, the arm 10 accurately stops at the locked position shown in FIGS. 1 and 7A by the action of the click stop mechanism. Then, as shown in FIG. 7A, the convex portion 21 stays in the first engagement groove portion 22a of the engagement groove 22, and thereby the rotation prevention function works to prevent the rotation of the arm 10, which is illegal. Unlocking is prevented.

  When the door guard is set in the locked state, the door 8 can be opened halfway. As the door 8 is opened, the edge of the guide groove 19 of the arm 10 slides on the protrusion 12, and the closing piece 10 c serving as the stop position of the arm 10 contacts the protrusion 12. As a result, the door 8 stops in a half-open state, and does not open any further.

  In order to unlock the door guard in this locked state, the arm 10 is held and slid in the arrow X direction, which is the door direction, against the urging force of the compression coil spring 15 as shown in FIG. Due to the slide guide function of the door guard, the convex portion 21 moves from the first groove portion 22a into the second groove portion 22b, thereby releasing the rotation preventing function. Then, when the arm 10 is pushed in the direction of the arrow Y, which is the unlocking direction, as shown in FIG. 7B, the second groove 22b slides along the convex portion 21 as shown in FIG. The arm 10 rotates to the unlocked position.

  As described above, in order to change the door guard from the locked state to the unlocked state, the arm 10 is unlocked by the rotation guide means only after the arm 10 is once slid in the direction perpendicular to the pivot 9 by the slide guide means. Since rotation to the position is not allowed, unauthorized release of the door guard is properly prevented.

  The arm 10 can also be stopped at the intermediate position shown in FIG. 8C by contact between the slide piece 16 of the click stop mechanism and the contact surface 17b. When the arm 10 is in this position, the projection 12 has already detached from the insertion / removal hole 18 and the door guard is in the unlocked state.

  As shown in FIG. 8 (D), when the arm 10 is further rotated, the convex portion 21 slides in the second groove portion 22b toward its end, and the arm 10 is moved onto the inner surface 8a of the door 8. When it has fallen substantially in parallel, it stops by contact between the slide piece 16 of the click stop mechanism and the contact surface 17c, and the arm 10 hits the stopper 13c which is a part of the bracket 13 to prevent further rotation. Further, the convex portion 21 stops at the end of the second groove portion 22b. Thereby, the door guard is completely unlocked, and the door 8 can be fully opened.

  In order to return the door guard to the locked state, the arm 10 is rotated in the direction opposite to the above from FIG. 8 (D) to FIG. 7 (A). As a result, when the convex portion 21 slides in the second groove portion 22b of the engaging groove 22 in the reverse direction and moves to the position shown in FIG. The urging force automatically returns to the original locking position as shown in FIG. Then, the rotation of the arm is prevented in a state where the convex portion 21 is fitted in the first groove portion 22 a of the engagement groove 22.

<Embodiment 2>
As shown in FIGS. 9 to 11, in the door guard according to the second embodiment, as in the case of the first embodiment, the rotation prevention means, the slide guide means, and the rotation guide means are common to each means. Of the arm 10 from the locked position to the unlocked position due to the engagement with the convex portion 21. It is formed so as to prevent the rotation, guide the convex portion 21 when the arm 10 is slid in the locked state, and allow the arm 10 to rotate to the unlocked position by using the post-sliding convex portion 21 of the arm 10 as a guide. However, this embodiment is different from the first embodiment in the following points.

  That is, the convex portion 21 is formed as a square shaft portion at both ends of the pivot 9 projecting from both sides of the arm 10, and the engagement groove 22 is formed in the arm pieces 13 a and 13 b of the bracket 13 as a slide hole of the square shaft portion. Moreover, the sliding hole which is the engagement groove 22 includes a round hole portion 22c which allows rotation of a square shaft portion formed at a position near the inner surface 8a (see FIG. 1) of the door 8 of the arm pieces 13a and 13b, And a square hole portion 22d that restrains the square shaft portion formed near the opposite door so as not to rotate so as to communicate with the round hole portion 22c. Further, the pivot 9 is fixed by a pin 25 so as not to rotate with respect to the arm 10.

  Next, the operation of the door guard according to the second embodiment will be described.

  The door guard is locked when the arm 10 is set at the position shown in FIG.

  In this locked state, the arm 10 accurately stops at the locked position by the action of the click stop mechanism. Then, as indicated by a two-dot chain line in FIG. 10, the rotation preventing function works by the angular shaft portion that is the convex portion 21 staying in the rectangular hole portion 22 d of the engagement groove 22, thereby preventing the rotation of the arm 10. Unauthorized unlocking is prevented.

  When the door guard is set in the locked state, the door 8 can be opened halfway as in the case of the first embodiment. As the door 8 is opened, the edge of the guide groove 19 of the arm 10 slides on the protrusion 12, and the closing piece 10 c serving as the stop position of the arm 10 contacts the protrusion 12. As a result, the door 8 stops in a half-open state, and does not open any further.

  In order to unlock the door guard in this locked state, the arm 10 is held and slid in the door direction so as to resist the urging force of the compression coil spring 15. Due to the slide guide function of the door guard, the convex portion 21 moves from the square hole portion 22d into the round hole portion 22c, thereby releasing the rotation preventing function. Then, when the arm 10 is pushed in the unlocking direction, the angular shaft portion which is the convex portion 21 slides and rotates along the round hole portion 22c by the rotation guide function, and the arm 10 rotates to the unlocking position. .

  As described above, in order to change the door guard from the locked state to the unlocked state, the arm 10 is unlocked by the rotation guide means only after the arm 10 is once slid in the direction perpendicular to the pivot 9 by the slide guide means. Since rotation to the position is not allowed, unauthorized release of the door guard is properly prevented.

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

It is a partial notch top view which shows the door guard which concerns on Embodiment 1 of this invention in a locked state. The arm and bracket of a door guard are shown, (A) is a partially cutaway front view in a locked state, and (B) is a front view in an unlocked state. It is a front view of a bracket. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. It is a side view of an arm. FIG. 2 is a partially enlarged view in FIG. 1. It is a figure explaining the effect | action of a door guard, (A) shows completion of locking, (B) shows completion of a slide, respectively. It is a figure explaining the effect | action of a door guard, (C) is in the middle of unlocking, (D) shows completion of unlocking, respectively. It is a partial notch front view which shows the arm and bracket of a door guard which concern on Embodiment 2 of this invention in the locked state. It is sectional drawing in the arm piece of the bracket shown in FIG. It is a side view of an arm and a pivot. It is a partial notch top view which shows the conventional door guard in the locked state. FIG. 13 is a partially enlarged view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 8 ... Door 9 ... Axis 10 ... Arm 11 ... Entrance / exit frame 12 ... Protrusion 18 ... Insertion / removal hole 19 ... Guide groove 21 ... Convex part 22 ... Engagement groove 22a ... First groove part 22b ... Second groove part

Claims (4)

A bracket (13) fixed to the door (8), an arm (10) rotatably connected to the bracket (13) via a pivot (9), and a protrusion attached to the entrance / exit frame (11) ( 12), and the arm (10) guides the protrusion (12) when the door is opened and the insertion / removal hole (18) through which the protrusion (12) is inserted and removed by the rotation of the arm (10) in the closed state. A guide groove (19) is provided , and a projection (12) is inserted into the insertion / removal hole (18) to enter a locked state, and the projection (12) is detached from the insertion / removal hole (18) to be in an unlocked state. In the door guard configured as described above, when the door guard is in a locked state, the slide guide means that enables the arm (10) to slide in the door opening / closing direction, and the arm (10) is biased to one slide end. Elastic body (15) and arm (10) above Rotation preventing means for preventing the arm (10) from rotating to the unlocked state while being urged by one slide end, and the arm (10) resists the urging force of the elastic body (15). And a rotation guide means for allowing the arm (10) to rotate to the unlocked state when being pushed by the other slide end, is provided between the bracket (13) and the arm (10) . A door guard characterized by that.   The door guard according to claim 1, wherein the rotation preventing means, the slide guide means, and the rotation guide means are connected to each other so that the convex portion (21) common to each means and the convex portion (21) engage with each other. The engagement groove (22) prevents the arm (10) from rotating from the locked position to the unlocked position by engaging with the convex portion (21), and in the locked state. When the arm (10) is slid, the convex part (21) is guided, and the rear slid convex part (21) of the arm (10) is guided to allow the arm (10) to rotate to the unlocked position. A door guard characterized by being formed.   The door guard according to claim 2, wherein the engaging groove (22) extends so as to intersect the pivot (9), and the pivot (9) extends from one end of the first groove (22a). And a second groove portion (22b) that curves and extends around the door guard.   The door guard according to claim 2, wherein the convex portion (21) is formed as a square shaft portion at both ends of the pivot (9) protruding from both sides of the arm (10), and the engaging groove (22) is formed in the bracket (13). It is formed as a sliding hole in the angular shaft part, and this sliding hole does not rotate the round hole part (22c) allowing the rotation of the angular shaft part and the angular shaft part formed so as to communicate with the round hole part (22c). A door guard comprising a square hole portion (22d) to be restrained.

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