Door guard

Abstract

To provide a door guard capable of preventing a door from becoming scratched, even when used in an irregular manner to avoid the door from closing.SOLUTION: The door guard comprises an arm member 10 and a locking pin 20. The arm member 10 has an insertion part 11 having a long hole shape. The insertion part 11 allows a shaft-shaped member to be inserted in a lateral direction X1 along a surface of a door 1 when an entrance / exit is closed. The arm member 10 is attached to one of the door 1 and a door frame 2 so as to be rotatable around a rotation shaft 12 disposed in the lateral direction X1. The locking pin 20 is attached to the other of the door 1 and the door frame 2 so as to advance / retreat in the lateral direction X1. The locking pin 20 is inserted in the insertion part 11 of the arm member 10, and engages with the arm member 10 in the insertion part 11, thereby locking the door 1 so as to open / close within a certain angular range.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD

[0001] The present invention relates to a door guard, and particularly to a door guard installed on a door such as a swing door. BACKGROUND ART

[0002] As a door guard installed on a door such as a swing door, Patent Document 1 describes a door guard including an arm member and a receiving member. The arm member is attached to a door frame so as to be rotatable in the lateral direction. The receiving member is attached to the door so as to be engageable with the arm member. According to the door guard described in Patent Document 1, by the engagement between the arm member and the receiving member, the door can be locked to open within a certain angular range, so that a visitor can be confirmed through the gap of the door, and articles can be handed over. PRIOR ART DOCUMENTS PATENT DOCUMENTS

[0003] PATENT DOCUMENT 1 Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 2021-503572 SUMMARY OF THE INVENTION PROBLEM TO BE SOLVED BY THE INVENTION

[0004] However, the door guard described in Patent Document 1, in addition to its original intended purpose of locking the door to open within a certain angular range, when installed in, for example, a hotel guest room, may be used in an irregular manner such that the arm member is sandwiched between the door and the door frame to prevent the door from being closed, so that the automatic lock will not be engaged during cleaning.

[0005] If the door guard described in Patent Document 1 is used in an irregular manner, such as by wedging the arm member between the door and the door frame to prevent the door from closing, the arm member may deform or the door may be scratched due to the collision between the door and the arm member. While deformation of the arm member can be repaired relatively easily by simply replacing the arm member, repairing scratches on the door is not so easy.

[0006] This invention has been made in view of the above problems, and its purpose is to provide a door guard that can prevent damage to a door even when it is used in an irregular manner to avoid the door closing. [Means for solving the problem]

[0007] The door guard disclosed herein comprises an arm member (10) and a locking pin (20). The arm member (10) has an elongated slotted insertion portion (11). The insertion portion (11) allows a shaft-shaped member to be inserted laterally (X1) along the surface of the door (1) when the doorway is closed. The arm member (10) is attached to one of the door (1) and the door frame (2) so as to be rotatable about a pivot axis (12) arranged along the lateral direction (X1). The locking pin (20) is attached to the other of the door (1) and the door frame (2) so as to be able to move back and forth along the lateral direction (X1). The locking pin (20) is inserted into the insertion portion (11) of the arm member (10) and locks the door (1) so as to be able to open and close within a certain angular range by engagement with the arm member (10) at the insertion portion (11).

[0008] In the door guard disclosed herein, the locking pin (20) has a cylindrical shaft portion (21) and a circular head portion (22). The head portion (22) has a larger diameter than the shaft portion (21) and is formed at the tip of the shaft portion (21). The insertion portion (11) of the arm member (10) has a first end portion (11a) on the base end side of the arm member (10) and a second end portion (11b) on the tip side of the arm member (10). A circular insertion portion (11c) is formed on the first end portion (11a). The insertion portion (11c) allows the head portion (22) of the locking pin (20) to be inserted. The width of the insertion portion (11) other than the insertion portion (11c) is set to a width (W1) that allows the shaft portion (21) to pass through but not the head portion (22) of the locking pin (20).

[0009] In the door guard disclosed herein, the arm member (10) is attached to one of the door (1) and the door frame (2) so as to be rotatable about a pivot axis (12) by fixing means (40) including a channel member (41) and a base member (42). The channel member (41) is in the shape of a rectangular plate having a pair of end faces (41a) that are parallel to each other, and has a pair of grooves (41b) on the pair of end faces (41a), and is fixed to one of the door (1) and the door frame (2) by screws. The base member (42) has a pair of protrusions (42a), a cover portion (42b) that covers the screws, and a support portion (42c) that supports the pivot axis (12). The pair of protrusions (42a) are slidably fitted into the pair of grooves (41b) of the channel member (41). [Effects of the Invention]

[0010] The door guard according to the present invention can prevent damage to the door even when used in an irregular manner, such as to avoid the door closing. [Brief explanation of the drawing]

[0011] [Figure 1] This is a perspective view showing a door guard according to an embodiment of the present invention. [Figure 2](a) A top view of the door guard shown in Figure 1 when it is attached to the door and door frame. (b) A front view of the door guard shown in Figure 1 when it is attached to the door and door frame. [Figure 3] (a) A top view showing the first stage of operation of the door guard in Figure 1. (b) A top view showing the second stage of operation of the door guard in Figure 1. (c) A top view showing the third stage of operation of the door guard in Figure 1. [Figure 4] (a) A top view showing the arm member of the embodiment. (b) A side view showing the arm member of the embodiment. [Figure 5] (a) A front view showing the pin member and moving means of the embodiment. (b) A top view showing the pin member and moving means of the embodiment. (c) A cross-sectional view taken along the line AA in Figure 5(a). [Figure 6] (a) A front view showing the rail member of the moving means of the embodiment. (b) A side view showing the rail member of the moving means of the embodiment. (c) A bottom view showing the rail member of the moving means of the embodiment. [Figure 7] (a) A side view showing the first state of the door guard from the second to the third stage in Figure 3. (b) A side view showing the second state of the door guard from the second to the third stage in Figure 3. (c) A side view showing the third state of the door guard from the second to the third stage in Figure 3. (d) A side view showing the fourth state of the door guard from the second to the third stage in Figure 3. [Figure 8] Figure 1 is a top view of the door guard when it is used in an irregular manner. [Figure 9] (a) A front view showing the channel member of the fixing means of the embodiment. (b) A cross-sectional view taken along the arrow BB in Figure 9(a). (c) A cross-sectional view taken along the arrow CC in Figure 9(a). [Figure 10] This is an exploded perspective view showing the fixing means of the embodiment. [Modes for carrying out the invention]

[0012] Hereinafter, a door guard according to an embodiment of the present invention will be described in detail based on the drawings. Note that the embodiments described below are preferred specific examples for implementing the present invention, and various technical limitations are imposed thereon, but the present invention is not limited to these embodiments unless a statement to the effect that the invention is particularly limited is clearly specified in the following description.

[0013] <Embodiment> Hereinafter, the door guard according to the embodiment of the present invention will be described with reference to Figures 1 to 3. Figure 1 is a perspective view showing the door guard according to the embodiment of the present invention. Figure 2(a) is a top view when the door guard of Figure 1 is attached to a door and a door frame. Figure 2(b) is a front view when the door guard of Figure 1 is attached to a door and a door frame. Figure 3(a) is a top view showing the first stage of the operation of the door guard of Figure 1. Figure 3(b) is a top view showing the second stage of the operation of the door guard of Figure 1. Figure 3(c) is a top view showing the third stage of the operation of the door guard of Figure 1.

[0014] As shown in Figures 1 to 3, the door guard according to the embodiment includes an arm member 10 and a locking pin 20, and is a device that locks a door 1 so as to be openable and closable within a fixed angular range (α1 in Figure 3(c)). In the embodiment, the door 1 is a swing door.

[0015] The arm member 10 has an elongated hole-shaped insertion portion 11. The insertion portion 11 allows a shaft-shaped member to be inserted in the lateral direction X1 along the surface of the door 1 when the doorway is closed. Further, the arm member 10 is attached to one of the door 1 and the door frame 2 so as to be rotatable around a rotation shaft 12 arranged along the lateral direction X1. The embodiment shows a case where the door guard is installed on the inward-opening door 1, and the arm member 10 is attached to the door frame 2. Hereinafter, description will be given on the assumption that the arm member 10 is attached to the door frame 2.

[0016] The locking pin 20 is attached to the other of the door 1 and the door frame 2 so as to be movable forward and backward along the lateral direction X1. The embodiment shows a case where a door guard is installed on an inward-opening door, and the locking pin 20 is attached to the door 1. Hereinafter, description will be given on the assumption that the locking pin 20 is attached to the door 1. Further, the locking pin 20 is inserted into the insertion portion 11 of the arm member 10 along the straight line L indicated by the one-dot chain line in Fig. 1, and by engagement with the arm member 10 at the insertion portion 11, locks the door 1 so that the door 1 can be opened and closed within a certain angular range as shown in Fig. 3(c). The locking pin 20 does not lock the door 1 at the non-engagement position indicated by the solid line in Fig. 2, and locks the door 1 at the engagement position indicated by the one-dot chain line in Fig. 2. The engagement position of the locking pin 20 is a position that advances further in the lateral direction X1 than the non-engagement position.

[0017] Further, in the first stage shown in Fig. 3(a), the locking pin 20 has not yet been inserted into the insertion portion 11; in the second stage shown in Fig. 3(b), the locking pin 20 is inserted into the insertion portion 11; and in the third stage shown in Fig. 3(c), the locking pin 20 maintains the state of being inserted into the insertion portion 11.

[0018] Next, the arm member 10 and the pin member 20 will be described in further detail with reference to Figs. 4 to 6. Fig. 4(a) is a top view showing the arm member of the embodiment. Fig. 4(b) is a side view showing the arm member of the embodiment. Fig. 5(a) is a front view showing the pin member and the moving means of the embodiment. Fig. 5(b) is a top view showing the pin member and the moving means of the embodiment. Fig. 5(c) is a cross-sectional view taken along the line A-A in Fig. 5(a). Fig. 6(a) is a front view showing the rail member of the moving means of the embodiment. Fig. 6(b) is a side view showing the rail member of the moving means of the embodiment. Fig. 6(c) is a bottom view showing the rail member of the moving means of the embodiment.

[0019] As shown in Fig. 4, in the embodiment, the arm member 10 is a lever-shaped member extending to draw a gentle circular arc, and a shaft hole 13 is formed at the base end portion of the arm member 10. The pivot shaft 12 is inserted through the shaft hole 13

[0020] The insertion portion 11 of the arm member 10 extends in a gentle arc and has a first end portion 11a on the base end side of the arm member 10 and a second end portion 11b on the tip end side of the arm member 10. A circular insertion portion 11c is formed in the first end portion 11a. The angular range (α1) in which the door 1 is locked to open and close is determined according to the distance between the shaft hole 13 and the second end portion 11b.

[0021] Furthermore, as shown in Figures 1 and 2(b), when the door 1 is closed, the arm member 10 hangs down with its tip pointing downwards, and the insertion portion 11c is attached to the door frame 2 so that it faces the pin 20 directly in the lateral direction X1.

[0022] As shown in Figure 5, the locking pin 20 has a cylindrical shaft portion 21 and a circular head portion 22. The head portion 22 has a larger diameter than the shaft portion 21 and is formed at the tip of the shaft portion 21. Furthermore, the side surface of the head portion 22 is tapered so that its diameter increases towards the tip of the locking pin 20.

[0023] The insertion portion 11c of the insertion portion 11 shown in Figure 4 allows the head 22 of the locking pin 20 to be inserted, and the locking pin 20 is inserted into the insertion portion 11 in the lateral direction X1 through the insertion portion 11c. The width of the insertion portion 11 other than the insertion portion 11c is set to a width W1 in which the head 22 of the locking pin 20 does not pass through, but the shaft portion 21 does.

[0024] As described above, according to the embodiment of the door guard, the locking pin 20 has a cylindrical shaft portion 21 and a circular head portion 22, the insertion portion 11 of the arm member 10 has an insertion portion 11c on the base end side of the arm member 10 through which the head portion 22 of the locking pin 20 can be inserted, and the width of the insertion portion 11 other than the insertion portion 11c is set to a width W1 through which the shaft portion 21 of the locking pin 20 can pass but not through the head portion 22. Therefore, when the door 1 is closed, the locking pin 20 is inserted into the insertion portion 11 in the insertion portion 11c in the lateral direction X1, and when a force is applied to open the door 1, the head portion 22 acts as a retainer, and the locking pin 20 locks the door 1 so that it can be opened and closed within a certain angular range by engaging with the arm member 10 at the insertion portion 11.

[0025] As shown in Figure 5, the locking pin 20 is attached to the other door frame 2, in this embodiment the door 1, so as to be able to move back and forth along the lateral direction X1 by a moving means 30. The moving means 30 has a rectangular parallelepiped slider 31 extending along the lateral direction X1 and a flat rectangular parallelepiped rail member 32 extending along the lateral direction X1. In Figures 5(a) and 5(b), the locking pin 20 and slider 31 in the engaged position are shown by solid lines, and the locking pin 20 and slider 31 in the disengaged position are shown by dashed lines.

[0026] The slider 31 of the moving means 30 has a locking pin 20 integrally protruding from its end face in the longitudinal direction toward the lateral direction X1. The slider 31 also has a groove-shaped engaging portion 31a that extends along the lateral direction X1, and a guide groove 31c of a certain length is formed parallel to the engaging portion 31a. The engaging portion 31a engages with the rail member 32 so as to be slidable along the lateral direction X1, and a pair of recesses 31b are formed on the bottom surface of the guide groove 31c.

[0027] The rail member 32 of the moving mechanism 30 is attached to the door 1 by a set screw 32a. The rail member 32 has a rib-shaped engaging portion 32b that extends along the lateral direction X1. The engaging portion 32b is slidably engaged with the engaging portion 31a of the slider 31 along the lateral direction X1, and the slider 31 is fixed to the rail member 32 so as to be movable along the lateral direction X1 within a certain length L1 range, and the locking pin 20 is movable between an unengaged position and an engaged position.

[0028] The range (length L1) over which the slider 31 is movable relative to the rail member 32 is restricted by a restricting means 32c. The restricting means 32c includes a spring 32d, a steel ball 32e, and a cylindrical slide guide 32j. The spring 32d biases the steel ball 32e toward the slider 31, and the steel ball 32e engages with a pair of recesses 31b formed in the slider 31 at a distance of length L1, temporarily fixing the slider 31 at the positions of the two recesses 31b. The slide guide 32j is biased toward the slider 31 by the spring 32d via the steel ball 32e and slidably engages with a guide groove 31c. The length of the guide groove 31c and the positions of the two recesses 31b correspond to the range (length L1) over which the slider 31 is movable relative to the rail member 32.

[0029] Furthermore, the slider 31 has a groove-shaped notch 31d that extends from the end face in the lateral direction X1 to the guide groove 31c, allowing a slender member such as a needle to be inserted through the notch 31d into the guide groove 31c. When a slender member is inserted through the notch 31d into the guide groove 31c, the slide guide 32j is pushed back against the biasing force of the spring 32d, releasing the engagement between the slide guide 32j and the guide groove 31c, allowing the slider 31 to slide beyond the length of the guide groove 31c, and thus the slider 31 can be removed from the rail member 32. Therefore, if the locking pin 20, which is integrally formed with the slider 31, becomes deformed or otherwise malfunctions, it is easy to replace the locking pin 20.

[0030] Furthermore, as shown in Figure 6, the rail member 32 has a first through hole 32f, a first storage chamber 32g, a second storage chamber 32h, and a protruding hole 32i. The first through hole 32f is through which a set screw 32a for fixing the rail member 32 to the door frame 2 is inserted. The first storage chamber 32g accommodates the head of the set screw 32a. The second storage chamber 32h accommodates a spring 32d, a steel ball 32e, and a slide guide 32j. The protruding hole 32i is a hole for allowing the steel ball 32e and the slide guide 32j to protrude from the second storage chamber 32h.

[0031] Next, the operation of the door guard of the embodiment will be described with reference to Figure 7. Figure 7(a) is a side view showing the first state of the door guard from the second to the third stage in Figure 3. Figure 7(b) is a side view showing the second state of the door guard from the second to the third stage in Figure 3. Figure 7(c) is a side view showing the third state of the door guard from the second to the third stage in Figure 3. Figure 7(d) is a side view showing the fourth state of the door guard from the second to the third stage in Figure 3.

[0032] As shown in Figure 7(a), when the door 1 is closed and there is no gap between the door edge 1a of the door 1 and the door frame 2, the arm member 10 hangs down with its tip pointing downwards, allowing the locking pin 20 to be inserted into the insertion part 11.

[0033] As shown in Figure 7(b), when a force is applied to open the door 1 while the locking pin 20 is inserted into the insertion portion 11 of the arm member 10, and the door edge 1a begins to separate from the door frame 2, the arm member 10 is pushed by the locking pin 20 and begins to rotate so that its tip separates from the door frame 2.

[0034] As shown in Figure 7(c), when the door edge 1a moves further away from the door frame 2, the arm member 10 is further pushed by the locking pin 20, and the arm member 10 is rotated so that its tip moves further away from the door frame 2.

[0035] As shown in Figure 7(d), when the gap between the door edge 1a and the door frame 2 becomes larger and the locking pin 20 moves to the second end 11b of the insertion part 11, the locking pin 20 engages with the arm member 10 in the insertion part 11, and the door 1 is locked by the locking pin 20 so that it does not open beyond the angular range α1 shown in Figure 3(c).

[0036] Next, with reference to Figure 8, the operation of the door guard of the embodiment when used in an irregular manner to prevent door 1 from closing will be described. Figure 8 is a top view of the door guard of Figure 1 when used in an irregular manner.

[0037] Figure 8 shows a state in which the door 1 is not completely closed, the arm member 10 hangs down with its tip pointing downwards, and the locking pin 20 has moved to the engagement position shown by the solid line in Figure 5(a) without being inserted into the insertion part 11. In the state shown in Figure 8, when the hand that was holding the door 1 open is released and the door 1 is about to close, the locking pin 20 comes into contact with the outer surface of the arm member 10, preventing the door 1 from closing completely.

[0038] As described above with reference to Figures 1 to 8, according to the embodiment of the door guard, the arm member 10 is rotatable about a pivot axis 12 arranged along the lateral direction X1 and attached to one of the door frame 2, in this embodiment to the door frame 2, and the locking pin 20 is rotatable about the other of the door frame 2, in this embodiment to the door 1, and the locking pin 20 is inserted into the insertion portion 11 of the arm member 10, and the engagement of the arm member 10 at the insertion portion 11 locks the door 1 so that it can be opened and closed within a certain angular range.

[0039] Therefore, when the door 1 is open, the locking pin 20 moves to the engagement position shown by the solid line in Figure 5(a). As a result, the locking pin 20 moves to the engagement position without being inserted into the insertion portion 11 of the arm member 10, and when the hand is released from the door 1, the locking pin 20 comes into contact with the outer surface of the arm member 10, as shown in Figure 8. Consequently, even if the door guard of this embodiment is used in an irregular manner to prevent the door 1 from closing completely, the door will not collide with the arm member as with the conventional door guard shown in Patent Document 1, and damage to the door 1 can be prevented.

[0040] Furthermore, as shown in Figure 8, when the locking pin 20 and the arm member 10 are in contact, only a force is applied between them in a linear direction substantially perpendicular to the surface of the door 1. On the other hand, in conventional door guards such as those described in Patent Document 1, if the arm member is caught between the door and the door frame, a large force is applied to the arm member due to the lever principle, which can cause the arm member to deform. The door guard of this embodiment does not apply a large force to the door guard even when used in an irregular manner to prevent the door 1 from closing completely, and damage to the door guard itself can be suppressed.

[0041] Furthermore, as explained with reference to Figures 1 to 8, according to the door guard according to the embodiment, when the door 1 is opened normally without using the door guard, the locking pin 20 moves from the engaged position to the disengaged position in the lateral direction X1. In the disengaged position, the length of the locking pin 20 protruding from the door edge of the door 1 in the lateral direction X1 is short or it hardly protrudes at all. Therefore, compared to conventional door guards such as the one shown in Patent Document 1, in which the receiving member always protrudes significantly from the door edge, the locking pin 20 does not get caught on clothing, and the convenience of the user can be improved.

[0042] Next, the fixing means of the embodiment will be described with reference to Figures 9 to 10. Figure 9(a) is a front view showing the channel member of the fixing means of the embodiment. Figure 9(b) is a cross-sectional view taken along the arrow BB in Figure 9(a). Figure 9(c) is a cross-sectional view taken along the arrow CC in Figure 9(a). Figure 10 is an exploded perspective view showing the fixing means of the embodiment.

[0043] In the door guard of this embodiment, the arm member 10 is attached to either the door 1 or the door frame 2, in this embodiment to the door frame 2, so as to be rotatable about a pivot axis 12 by a fixing means 40 which includes a channel member 41 and a base member 42.

[0044] As shown in Figure 9, the channel member 41 of the fixing means 40 is in the shape of a rectangular plate and has a pair of grooves 41b on a pair of parallel end faces 41a. The channel member 41 is fixed to the door frame 2 by screws and has a pair of second insertion holes 41d through which a pair of set screws 41c shown in Figure 10 are inserted, and a pair of third housing chambers 41e that accommodate the heads of the pair of set screws 41c.

[0045] Furthermore, the channel member 41 has a fitting recess 41f and a third through hole 41g. The fitting recess 41f engages with the fitting projection 42d of the base member 42. A set screw 41c is inserted through the third through hole 41g. The set screw 41c inserted through the third through hole 41g fixes the base member 42 to the channel member 41 and the door frame 2.

[0046] The base member 42 of the fixing means 40 has a pair of protruding parts 42a, a covering part 42b, a support part 42c, a fitting projection 42d, a fourth insertion hole 42e, and three plate-shaped parts 42f arranged in a U-shape.

[0047] The pair of protruding portions 42a are formed on the opposing surfaces of a pair of plate-shaped portions 42f that are arranged facing each other in the horizontal direction among the three plate-shaped portions 42f, and are slidably fitted into a pair of grooves 41b of the channel member 41.

[0048] The covering portion 42b is plate-shaped, and three sides of its outer circumference are integrally connected to the side ends of the three plate-shaped portions 42f. The covering portion 42b covers the pair of third storage chambers 41e of the channel member 41, thereby covering the pair of set screws 41c that fix the channel member 41 to the door frame 2.

[0049] The support portion 42c is formed from two opposing triangular plate-like members that are integrally connected to the cover portion 42b, and has a support hole 42g for supporting the pivot shaft 12, thereby supporting the pivot shaft 12.

[0050] The fitting projection 42d is provided projecting downward from the lower surface of the upper plate-shaped portion 42f, which is positioned between a pair of plate-shaped portions 42f that are horizontally opposed to each other among the three plate-shaped portions 42f. The fitting projection 42d also engages with the fitting recess 41f when the pair of protruding portions 42a are slidably fitted with the pair of groove portions 41b.

[0051] A set screw 41c is inserted through the fourth through hole 42e. The set screw 41c inserted through the fourth through hole 42e is also inserted through the third through hole 41g of the channel member 41, fixing the base member 42 and the channel member 41 to the door frame 2. The set screw 41c inserted through the fourth through hole 42e fixes the base member 42 to the channel member 41 such that a pair of protrusions 42a are slidably fitted into a pair of grooves 41b, and the fitting projection 42d is fitted into the fitting recess 41f.

[0052] Furthermore, the head of the set screw 41c, which is inserted into the fourth insertion hole 42e, is covered by a resin cover member 43 attached to the cover portion 42b. The position in which the fourth insertion hole 42e is formed in the cover portion 42b is set so that the cover member 43 is sandwiched between the arm member 10, which hangs down with its tip pointing downwards, and the cover portion 42b. Therefore, when the arm member 10 is hanging down with its tip pointing downwards, it does not come into contact with the cover portion 42b, but rather with the cover member 43, thus preventing the generation of abnormal noise due to contact between the arm member 10 and the base member 42.

[0053] As described above with reference to Figures 9 and 10, according to the embodiment of the door guard, the fixing means 40 for fixing the arm member 10 includes a channel member 41 and a base member 42. The channel member 41 has a pair of grooves 41b and is attached to either the door 1 or the door frame 2 (in this embodiment, to the door frame 2) by set screws 41c. The base member 42 has a pair of protrusions 42a that slide-fit into the pair of grooves 41b, and a cover portion 42b that covers the set screws 41c. By covering the set screws 41c that attach the channel member 41 to the door frame 2 with the cover portion 42b, it becomes difficult to rotate the set screws 41c from the gap between the door 1 and the door frame 2 when the locking pin 20 is locking the door 1, thereby making it difficult to remove the arm member 10 from the door frame 2 and improving security. In addition, the heads of the set screws 41c are not visible, improving the appearance of the door guard.

[0054] Furthermore, as explained with reference to Figures 9 and 10, according to the door guard of this embodiment, the set screw 41c, which is inserted through the third insertion hole 41g of the channel member 41 and the fourth insertion hole 42e of the base member 42 and is used to fix the base member 42 to the channel member 41, is covered by the cover member 43. This makes it even more difficult to remove the arm member 10, further improving security. In addition, the cover member 43 covers the head of the set screw 41c while sandwiched between the arm member 10, which hangs down with its tip pointing downward, and the cover portion 42b. This prevents the set screw 41c from being turned unless the arm member 10 is rotated upward, further improving security, and also concealing the head of the set screw 41c, improving the appearance.

[0055] Furthermore, as explained with reference to Figures 9 and 10, according to the embodiment of the door guard, the base member 42 is fixed to the channel member 41 by the fitting of a pair of protrusions 42a and a pair of grooves 41b, and the fitting of a fitting projection 42d and a fitting recess 41f, and is fixed to the channel member 41 and the door frame 2 by a set screw 41c inserted through the fourth insertion hole 42e. Therefore, the load on the arm member 10 when force is applied to the door 1 to open the door 1 can be reliably received, and the reliability of the door guard's operation can be improved.

[0056] Embodiments of the present invention have been described above with reference to the drawings (Figures 1 to 10). However, the present invention is not limited to the embodiments described above, and can be implemented in various forms without departing from its essence (for example, (1) below).

[0057] In the above embodiment, the door 1 opens inward, the arm member 10 is attached to the door frame 2, and the locking pin 20 is attached to the door 1. If the door 1 opens outward, the arm member 10 is attached to the door 1, and the locking pin 20 is attached to the door frame 2. [Explanation of symbols]

[0058] X1…horizontal direction W1…width 1... Door 2… Door frame 10... Arm component 11... Insertion part 11a...first end 11b…Second end 11c... Insertion part 12…Rotating axis 20… Locking pin 21... Shaft 22...Head 30... Means of transportation 31... Slider 32... Rail components 40...Fixing means 41... Channel component 41b…Groove 41c... Set screw 42…Base component 42a...Protrusion part 42b... Covering part 42c...Support part 42d...Matching projection

Claims

1. An arm member (10) is attached to one of the door (1) and the door frame (2) so as to be rotatable about a pivot axis (12) arranged along the lateral direction (X1), and has an elongated slot-shaped insertion portion (11) into which an axial member can be inserted laterally (X1) along the surface of the door (1) when the door is closed. An axial locking pin (20) is attached to the other side of the door (1) and the door frame (2) so as to be able to move back and forth along the lateral direction (X1), and is inserted into the insertion portion (11) of the arm member (10), and locks the door (1) so as to be able to open and close within a certain angular range by engagement with the arm member (10) at the insertion portion (11). It is equipped with, The aforementioned arm member (10) is A channel member (41) is in the shape of a rectangular plate having a pair of end faces (41a) that are parallel to each other, and has a pair of grooves (41b) on the pair of end faces (41a), and is fixed to one of the door (1) and the door frame (2) by screws, A base member (42) having a pair of protruding parts (42a) that slide into the pair of grooves (41b) of the channel member (41), a covering part (42b) that covers the screw, and a support part (42c) that supports the pivot shaft (12). A door guard that is attached to one of the door (1) and the door frame (2) so as to be rotatable about the pivot axis (12) by fixing means (40) including a door guard.

2. The locking pin (20) has a cylindrical shaft portion (21) and a circular head portion (22) which is larger in diameter than the shaft portion (21) and is formed at the tip of the shaft portion (21). The door guard according to claim 1, wherein the insertion portion (11) of the arm member (10) has a first end (11a) on the base end side of the arm member (10) and a second end (11b) on the tip side of the arm member (10), and the first end (11a) has a circular insertion portion (11c) through which the head (22) of the locking pin (20) can be inserted, and the width of the insertion portion (11) other than the insertion portion (11c) is set to a width (W1) that does not allow the head (22) of the locking pin (20) to pass through, but does allow the shaft portion (21) to pass through.

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