JP3076864B2 - Door guard - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention restricts the opening angle of a door, such as an entrance or a service door, to be provided in place of a door chain for the purpose of crime prevention at bedtime or the like. Regarding door guards. 2. Description of the Related Art An example of a conventional door guard is disclosed in Japanese Utility Model Publication No. 4-35490. In this door guard, pins are respectively inserted from outside into shaft holes of bearing brackets on both sides of an arm mounting base. After inserting the pin and projecting the pin slightly to pass through the wave washer, insert the pin into the shaft hole at the base end of the engaging arm by inserting the base end on both sides of the engaging arm between the bearing brackets, The retaining ring for the shaft is fitted to the insertion end of the pin protruding to the side, the arm mounting base is turned over, and from the opening provided from the bottom surface of the flange portion of the arm mounting base to the base end of the engaging arm. In this configuration, a sphere (steel ball) is inserted so as to abut, a compression coil spring for snap action is inserted, and then a flat washer is inserted into an opening provided from the bottom surface of the flange portion and swaged. [0003] According to the door guard having the above structure, the wave washer is slightly compressed, so that the rattling of the engaging arm in the pin axial direction is eliminated and friction is given to the turning operation. Due to the structure, the dimension from the outer surface of one base end of the engagement arm to the outer surface of the other base end, plus the thickness of the two wave washers, is between the brackets of the arm mounting base. The distance is exactly the same, so insert the pins from the outside into the shaft holes of the bearing brackets on both sides of the arm mounting base, slightly project the pins, pass through the wave washers, and then between the wave washers. It is difficult to insert the base end of the engagement arm because there is no gap, and it requires skill and time. The installation of the retaining ring for the shaft is also performed in a very small space, requiring skill and time. Because of this, the number of parts was large and assembly was difficult. According to the door guard having the above configuration, since two compression coil springs are arranged side by side corresponding to the base end of the engagement arm housed between the bearing brackets of the arm mounting base, the mounting space for the compression coil springs is reduced. Therefore, a large winding diameter and height of the compression coil spring could not be adopted, and the urging force of the compression coil spring could not be increased. The door guard is usually made of a different material from the pin, the engaging arm and the arm mounting base, and is different in color. However, according to the door guard having the above configuration, since the pin is fitted into the shaft hole of the bracket of the arm mounting base from outside,
The pin is exposed to the outside, and therefore, in order to adjust the appearance to the color desired by the customer, a pin having a plating of a desired color on the engagement arm and the arm mounting base usually made of zinc is generally used. Is made of stainless steel and remains the material color, so the texture is different. This is because plating on stainless steel pins is difficult and expensive. Therefore, the texture can be unified unless the pins are exposed to the outside. According to the door guard having the above configuration, the spherical body presses the base end of the arm by the urging force of the compression coil spring, and when the turning of the engaging arm is repeated, the spherical end damages the base end of the engaging arm. The plating on the base end of the joint arm was peeled off, and this part was exposed to the outside, making the appearance worse. According to the door guard having the above configuration, the turning position of the engagement arm is determined by pressing the sphere against the concave portion formed at the base end of the engagement arm by the urging force of the compression coil spring,
In the positioning by the concave portion and the sphere, the force for fixing the position is weak. It has been difficult to form the recess at a precise position at the base end of the engagement arm so that the spheres face each other. As another embodiment of the conventional door guard, there is Japanese Utility Model Laid-Open No. 7-10325, which relates to an improvement of the above-mentioned door guard disclosed in Japanese Utility Model Publication No. 4-35490. Pointed out the problem that the number of parts was large, the assembly was very troublesome, and it took time to assemble.
It is stated that the number of parts can be reduced, the wave washer can be easily incorporated, and the device can be manufactured at low cost, while taking advantage of the advantage of the No. 90 door guard. However, the door guard disclosed in Japanese Utility Model Laid-Open No. 7-10325 only solves the above problems, but does not solve the above problems. And even though the door guard of Japanese Utility Model Application Laid-Open No. 7-10325 solves the above-mentioned problems, it is not recognized that the number of parts has been reduced merely by simplifying the installation of the wave washer, and the production cost is not recognized. It is not to the extent that the reduction was recognized. Therefore, there is an object to solve the above-mentioned problems, while taking advantage of the door guard of Japanese Utility Model Publication No. 4-35490. As other examples of the conventional door guard, there are Japanese Utility Model Laid-Open No. 5-52154 and Japanese Utility Model Laid-Open No. 5-52155. These door guards are provided by narrowing the distance between the base ends of the engaging arms. Since it is necessary to fit the shaft formed integrally with the outer surface of the end into the shaft hole of the bearing bracket of the arm mounting base, there is a limit to increasing the rigidity of the engaging arm, and therefore, there is a limit. When a force is applied, one or both of the expansion between the bearing brackets of the arm mounting base and the narrowing between the base ends of the engagement arms occur, and the shaft on the outer surface of the base end of the engagement arm becomes There is a risk of escape from the shaft hole of the bearing bracket of the table. In addition, the door guard of Japanese Utility Model Laid-Open No. 5-52154 has an exposed leaf spring, which makes it unattractive.
The color tone could not be unified, and a sufficient positioning and fixing force could not be obtained. Further, in the door guard of Japanese Utility Model Laid-Open No. 5-52155, when the engaging arm is turned, the engaging arm moves upward or downward, and one of the shafts integral with the engaging arm moves so that the engaging arm is bent. There is a concern that it may escape in conjunction with the situation, and the unevenness of the bracket of the arm mounting base is largely exposed, and the appearance is poor. The present invention has been made in view of the above points, and has an arm and a rotary shaft integrally formed and assembled from the bottom surface of an arm mounting base to plate the rotary shaft without exposing the rotary shaft to the outside.・ Pre-painted color tone (including texture) without painting
It is an object of the present invention to provide a door guard which has a structure in which the peeling of the plating of the arm is not exposed to the outside, the number of parts is small and the assembly is easy, a large spring force can be secured, and the positioning and holding force of the arm is large. According to the present invention, as a means for solving the above-mentioned problems, base ends 10a, 10a on both sides of a U-shaped engagement arm 10 are provided with a door D or a door vertical. An arm mounting base 20 fixed to one of the frames W is sandwiched between two bearing brackets 20b, 20b, and base ends 10a, 10a on both sides are pivotally connected by two rotating shafts 12, 12, With the door D fully closed, the door D is inserted into the slit entrance 11a between the base ends 10a, 10a of the engagement arm 10.
Or a hook 30 fixed to the other one of the door vertical frames W
When the door D is opened with the head 30b of the hook 30 being inserted, the connecting portion 30c having a smaller cross-sectional shape than the head 30b of the hook 30 is inserted into the U-shaped slit 11 of the engagement arm 10. In a door guard that stops at a depth end of the slit and restricts the opening angle of the door D to be small, the rotating shafts 12 on both sides are convex on outer surfaces of base ends 10a on both sides of the engaging arm 10. The arm mounting base 20 has a concave portion 20c formed to extend from the bottom surface of the flange portion 20a to the inside of the two bearing bracket portions 20b, 20b, and opens between the two bearing bracket portions 20b, 20b. The engaging arm 10 is inserted from the bottom surface of the flange portion 20a into the opening 20d, and the rotating shafts 12 on both sides are accommodated in the concave portion 20c. The present invention provides a door guard characterized in that the elastic body is mounted in the recess 20c so that the biasing force of the elastic body acts in a direction in which the rotating shafts 12, 12 do not come out of the recess 20c. Preferably, in the present invention, the pressing members 41, 41 and the compression coil springs 42, 42 as the elastic body are sequentially stacked on the rotating shafts 12, 12, and the cover 43 is attached so that the compression coil springs 42, 42 are biased. The pressing member 41 has a concave portion 41a formed from the bottom surface.
2 and 42 are housed, and the side surface is sandwiched between the inner wall of the bearing bracket 20b, the step 43b of the cover 43, and the inner wall of the bearing bracket 20b, and is guided in a direction orthogonal to the rotating shaft 12. A door guard is provided. Preferably, in the present invention, the surface of the pressing member 41 that comes into contact with the rotating shaft 12 is provided with a convex portion 41b for positioning the rotating shaft such that the direction of the convex line is along the axial direction of the rotating shaft 12. The rotary shaft 12 is provided with a plurality of concave ridges 12a, 12b, 12c, and the engaging arm 10 is moved to a locked position and a predetermined angle within a range of 90 ° to 180 ° from the locked position. When the door is turned to the unlocked position that has been caused, any one of the concave ridges 12a, 12b, and 12c is provided to face the convex ridge 41b, thereby providing a door guard. A first embodiment of a door guard according to the present invention will be described below with reference to FIGS. FIG.
As shown in (a) or (b), this door guard is
Arm mounting base 20 for pivotally supporting U-shaped engagement arm 10
Is fixed to either the door D or the door vertical frame W by screws 50, and the U-shaped slit 11
The base portion 30a of the hook 30 that engages and disengages with the engaging arm 10 is fixed to the other of the door D and the door vertical frame W with the screw 51 in correspondence with the engaging arm 10, and the engaging arm 10 is closed in a state where the door is fully closed. Is swung so as to cover the hook 30 as shown in FIG.
When the door D is opened in this state, the head 30b of the hook 30 enters the slit entrance 11a between the base ends 10a, 10a of the engaging arm 10 shown in FIG. A connecting portion 30c having a smaller cross-sectional shape than the head portion 30b is inserted into the U-shaped slit 11 of the engaging arm 10 and stops at the depth end of the slit, thereby limiting the opening angle of the door to a small value. As shown in FIG. 2, the engaging arm 10 includes a rotating shaft 1 integrally formed on the outer surfaces of the base ends 10a, 10a.
2 and 12 are formed in a U-shape. The engagement arm 10 is formed in a U-shape,
The distance between the base ends 10a, 10a, which are the entrances of the hooks 1, is slightly larger than the head 30b of the hook 30 to form a slit entrance 11a.
The slit width on the back side of 1a is the head 30b of the hook 30.
And larger than the connecting portion 30c of the hook 30. The arm mounting base 20 has a flange portion 20a.
The two bearing brackets 20b, 20b have an integral shape in which they are raised, and have a concave portion 20c formed so as to extend from the bottom surface of the flange portion 20a to the inside of the two bearing brackets 20b, 20b. It has an opening 20d that opens between 20b and 20b. As shown in FIGS. 2, 3 and 4, the U-shaped tip of the engaging arm 10 is attached to the arm mounting base 20. The rotating shafts 12, 12 on both sides of the engaging arm 10 are inserted into the opening 20 d from the side of the flange portion 20 a and housed in the concave portions 20 c of the arm mounting base 20, and the pressing members 4 are attached to the rotating shafts 12, 12.
1, 41, and then the compression coil springs 42, 42
Are provided on the cover 43 so as to prevent the compression coil springs 42 from being displaced.
The cover 43 is fitted into the concave portion 20c of the arm mounting base 20 and is fixed with screws 44 so that the compression coil springs 42 are compressed and biased. The pressing member 41 has a concave portion 41a formed from the bottom surface, and the compression coil springs 42, 4 are formed in the concave portion 41a.
2 and half of the bearing bracket 20
b and the step 43b of the cover 43 and the inner wall of the bearing bracket 20b, and are guided in a direction perpendicular to the rotating shaft 12. Accordingly, since the pressing member 41 does not tilt in the lateral direction, the rotation shaft 12 rotates by rotating the engagement arm 10, and the dimension from the rotation center of the non-circular rotation shaft 12 to the contact point with the pressing member 41 changes. Accordingly, the pressing member 41 can move smoothly. Further, in accordance with the structure in which the pressing member 41 is not pressed against the base end portion 10a of the engagement arm 10 but against the rotating shaft 12, the compression coil spring 42 is provided in the concave portion 41a of the pressing member 41.
Since the half of the compression coil spring 42 is accommodated, a large length of the compression coil spring 42 can be secured. As shown in FIGS. 1A and 1B and FIGS. 4E to 4H, the surface of the pressing member 41 which abuts the rotating shaft 12 has the convex and concave directions of the rotating shaft 12. A ridge 41b for positioning the rotation axis is provided so as to project in a direction along the axial direction, and the cross-sectional shape of the ridge 41b at an arbitrary position in a direction perpendicular to the rotation axis 12 is the same. As shown in FIGS. 1 (a) and 1 (b), three concave ridges 12a, 12b and 12c are
To the unlocked position indicated by the dash-dot line generated by 90 ° from the locked position, and the unlocked position indicated by the two-dot chain line further raised by 90 ° from the unlocked position indicated by the solid line. Then, any one of the concave ridges 12a, 12b, and 12c is index-engaged with the convex ridge 41b in a face-to-face state with the four planes, so that accurate positioning is performed. In this case, for example, the ridge 41b
Is disengaged from the concave ridge portion 12a and engages with the adjacent concave ridge portion 12b, the urging of the compression coil spring 42 acts on the turning operation of the engagement arm 10 with a snap action. Positioning is performed. In addition,
A quarter convex arc-shaped cylindrical convex curved surface 12 d is formed on the rotating shaft 12, and the bearing bracket 20 b of the arm mounting base 20 is provided.
The concave portion 20c formed so as to go inside the inner surface of the concave portion 20b faces the cylindrical convex curved surface 20c 'of a half arc,
This ensures that the engagement arm 10 can perform a stable turning operation. The screws 50 for mounting the above-mentioned arm mounting base 20 to the door or the door vertical frame are shown in FIGS.
As shown in (a) and (d), screw holes 20e provided at both ends of the flange portion 20a of the arm mounting base 20 are provided.
And a screw hole 43a provided in the center of the cover 43. Next, a second embodiment of the door guard of the present invention will be described with reference to FIG. This door guard is
The rotating shaft 12 is formed in the shape of a square axis having a quarter-circular cylindrical convex curved surface 12d and three planes 12e, 12f, and 12g, and the surface of the pressing member 41 that contacts the rotating shaft 12 is a flat surface 41c. Has become. When the urging force of the compression coil spring 42 is set to the first embodiment, the force for stopping the rotation of the rotary shaft 12 is stronger in the first embodiment. Next, a third embodiment of the door guard of the present invention will be described with reference to FIG. This door guard is
A leaf spring 4 bent in a U-shape instead of the pressing member 41 of the door guard and the compression coil springs 42, 42 of the first embodiment
5 is different from the door guard of the first embodiment only. Next, modified examples included in the technical scope of the present invention will be described. The door guard of the present invention includes a door guard that can be rotated by 180 ° and that can be used for both a single door and a parent-child door. The turning angle between the locking position and the unlocking position of the engagement arm 10 may be 180 ° or an appropriate obtuse angle instead of 90 °. It is sufficient that the elastic body is provided so as to urge the rotating shaft 12, and the elastic body itself is provided in the concave portion 20c of the arm mounting base 20.
In this case, the cover 43 need not be provided. Although the surfaces forming the ridges 41b and the ridges 12a are each composed of four planes in the drawing, they may be composed of a plurality of planes. It may be. As described above, according to the door guard of the present invention, the rotating shaft 12 is provided on the outer surface of the base end on both sides of the engaging arm 10 and the flange of the arm mounting base 20 is provided. The engagement arm 10 is inserted from the bottom of the
2 is concealed inside the bearing bracket portion of the arm mounting base 20, and the elastic shaft urges the rotating shaft 12 instead of the base end of the engaging arm 10 so that the elastic body is also concealed. As a result, a conventional door guard assembled by inserting a pin serving as a rotating shaft into a bearing bracket of an arm mounting base by inserting a pin between the bearing brackets of the arm mounting base and bending and narrowing the base ends of both sides of the engaging arm. No. 35490, 7-1
No. 0325), assembling becomes simpler, the number of parts is reduced, and the production cost can be reduced.
When the elastic body is a compression coil spring, a large winding diameter and height of the coil spring can be secured, and when the elastic body is a leaf spring bent in a U-shape, a large radius of curvature and a large thickness can be adopted. Since the biasing force can be increased, the positioning and holding force of the arm can be increased and the snap action of the arm can be enhanced. The rotating shaft 12 can be formed integrally with the engaging arm 10 and can be rotated. Plating applied to the base end of the engaging arm 10 eliminates the uneconomical effect of separately plating the shaft 12 and the engaging arm 10 as in the prior art, and facilitates unification of the color tone (including texture) of the appearance. Is removed, and even if the plating applied to the rotating shaft 12 is peeled off, the plating is concealed inside the bearing bracket portion of the arm mounting base, so that the appearance is not deteriorated. . Also,
ADVANTAGE OF THE INVENTION According to the door guard of this invention, the base end of the both sides of the engagement arm which the rotation axis projected on the outer surface of the conventional base end bent and narrowed, and was pinched between the bearing bracket parts of an arm mounting base. Door guards (No. 5-52154, No. 5-52154) in which the dimensions of the base ends on both sides of the engagement arm are restored so as to be enlarged, and the rotating shaft is fitted into a shaft hole provided on the inner surface of the bearing bracket.
No. 52155), the engagement arm 10 can have sufficient rigidity,
There is no fear that the rotating shaft will escape even if a large door opening force is applied. Positioning the locking position and the unlocking position of the engagement arm 10
A concave ridge portion 12a provided on the rotation shaft 12 of the engagement arm 10,
The pressing is performed by the face-to-face pairing with the ridge 41b provided on the pressing member 41, and the ridge direction of the ridge 12a and the ridge 41b.
When the ridge direction is configured to be in the direction along the axial direction of the rotation shaft, the sphere is pressed against the concave portion provided at the base end of the engaging arm to lock and unlock the engaging arm. As compared with the conventional door guard that positions the position, the force for positioning and locking the locking position and the unlocking position of the engagement arm can be secured more, and the reliability is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing an embodiment in which a door guard of the present invention is mounted on a door and a door frame. FIG. 2 is an exploded perspective view of the door guard according to the first embodiment of the present invention. FIG. 3 is a detailed view of an arm mounting base of the door guard according to the first embodiment of the present invention, wherein (a) is a longitudinal sectional view and (b) is a side view. 4A and 4B are detailed views of the door guard according to the first embodiment of the present invention, wherein FIG. 4A is a front view, FIG. 4B is a bottom view, FIG. d) is an aa sectional view in (a), (e) is an ee sectional view in (d),
(F) is the same cross section as the ee cross section, and the engagement arm is 4
FIG. 5G is a view showing a state in which the engagement arm is tilted by 5 °, and FIG. FIG. 5 is a detailed view of a door guard according to a second embodiment of the present invention, and is a cross-sectional view corresponding to FIG. 4 (e). FIGS. 6A and 6B are detailed views of a door guard according to a third embodiment of the present invention, wherein FIG. 6A is a partially sectional bottom view, and FIG. [Description of Signs] D: Door, W: Door vertical frame, 10: Engagement arm 10a: Base end, 11: Slit, 11a: Slit entrance, 12: ..Rotating shaft, 12a, 12b, 12c... Recessed portion, 20... Arm mounting base, 20a... Flange portion, 20b... Bearing bracket portion, 20c... Concave portion, 20d. · Opening, 30 ··· Hook, 30b ··· Head, 30c ··· Connection part, 41 ··· Pressing member, 41b ··· Protrusion, 42 ··· Compression coil spring, 43 ··· Cover , 45 ... leaf spring,

Claims (1)

(1) Two bearing brackets of an arm mounting base in which base ends on both sides of a U-shaped engaging arm are fixed to one of a door and a door vertical frame. In the slit entrance between the proximal ends of the engaging arms, with the door fully closed, the door or door vertical frame When the door is opened with the head of the hook fixed to the other end positioned, the connecting portion having a smaller sectional shape than the head of the hook is inserted into the U-shaped slit of the engaging arm. A door guard that stops at a depth end of the slit to limit the opening angle of the door to a small value, wherein the rotation shafts on both sides are projected from outer surfaces of base ends on both sides of the engagement arm; Goes inside the two bearing brackets from the bottom of the flange And has an opening that opens between the two bearing brackets, and an engagement arm is inserted through the opening from the bottom surface of the flange to accommodate the rotating shafts on both sides in the recess. A door guard, wherein the elastic body is mounted in the recess so that the urging force of the elastic body acts in a direction in which the rotating shaft does not escape from the recess. 2. A pressing member and a compression coil spring as the elastic body are sequentially stacked on the rotating shaft, and a cover is attached so that a bias is generated in the compression coil spring. The pressing member has a concave portion formed from a bottom surface, A half of the compression coil spring is accommodated in the recess, and the side surface is guided by the inner wall of the bearing bracket, the step of the cover, and the inner wall of the bearing bracket so as to be guided in a direction perpendicular to the rotation axis. The door guard according to claim 1, wherein: 3. A convex portion for positioning a rotary shaft is provided on a surface of the pressing member, which is in contact with the rotary shaft, such that a convex line direction is in a direction along an axial direction of the rotary shaft. Are provided with a plurality of concave portions, and when the engaging arm is turned to a locking position and an unlocking position raised from the locking position by a predetermined angle within a range of 90 ° to 180 °, the concave portion of the concave portion is formed. 3. The door guard according to claim 2, wherein any one of the projections faces the projection.