JPH0941765A - Door guard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a door arm which protects the outside of a rotary shaft from being exposed by mounting from the bottom of an arm mounting base which molds an arm and a rotary shaft integrally and eliminates the need for plating and is capable of unifying the order of color for the outward appearance and prevents the plating of the arm from being separated and exposed outside and minimizes the number of components and is capable of securing a large spring force in simple mounting structure and increases a holding force of the position of the arm. SOLUTION: Rotary shafts 12 are projectingly provided on the outside surface of base ends 10a on both sides of an engagement arm 10. An arm mounting base 20 is arranged to provide a recessed part which is formed so that it may hollow out the insides of two bearing brackets 20b from the bottom of a flange 20a and provide an opening 20d which is opened through two bearing brackets 20b as well. The engagement arm 10 is inserted into the opening 20d from the bottom of the flange 20a so that the rotary shafts 12 may be housed in the recessed part 20c. The elastic body is mounted inside the recessed part 20c in such a fashion that an energizing force of the elastic body may act in the direction at which the rotary shafts 12 is not escaped from the recessed part 20c.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided in place of a door chain or the like for the purpose of crime prevention at bedtime or the like, and restricts the opening angle of a door such as a front door or a doorway to a small value. Regarding door guards. An example of a conventional door guard is Japanese Utility Model Publication No. 4-35490. This door guard is provided with pins from the outside into shaft holes of bearing bracket portions on both sides of an arm mounting base. After inserting the pin and slightly protruding the pin and passing it through the wave washer, sandwich the base ends on both sides of the engagement arm between the bearing bracket parts and insert the pin into the shaft hole of the base end of the engagement arm. Fit the shaft retaining ring to the insertion end of the pin protruding to the side, turn over the arm mounting base, and open the hole provided from the bottom surface of the flange of the arm mounting base to the base end of the engaging arm. A sphere (steel ball) is inserted so as to abut and then 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 caulked. According to the door guard having the above-described structure, the wave washer is slightly compressed, so that the rattling of the engaging arm in the axial direction of the pin is eliminated and friction is imparted to the turning operation. Since it is a structure, the dimension from the outer surface of one base end of the engaging 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. It is exactly the same as the clearance, and therefore pins are inserted from the outside into the shaft holes of the bearing brackets on both sides of the arm mounting base, and the pins are slightly projected to pass through the wave washer, and then between the wave washers. It is difficult to insert the base end of the engaging arm because there is no gap, and it requires skill and takes time. Since the mounting of the retaining ring for the shaft is done in an extremely narrow space, it requires skill and takes time. Because of this, the number of parts was large and assembly was difficult. According to the door guard configured as described above, since the two compression coil springs are arranged side by side in correspondence with the base end portions of the engagement arms housed between the bearing bracket portions of the arm mounting base, the mounting space for the compression coil springs is reduced. However, the winding diameter and height of the compression coil spring cannot be increased, and the biasing force of the compression coil spring cannot be increased. Normally, the door guard is made of a different material from the pin, the engaging arm and the arm mounting base, and has a different color. However, according to the door guard configured as described above, since the pin is fitted from the outside into the shaft hole of the bracket of the arm mounting base,
Since the pin is exposed to the outside, in order to adjust the appearance to the customer's preferred color tone, the pin which is usually made of zinc and the arm mounting base is plated with a desired color is generally used. Is made of stainless steel and has the same material color, so the texture is different. This is because it is difficult and expensive to plate the stainless steel pins. Therefore, the texture can be unified if the pins are not exposed to the outside. According to the door guard having the above structure, the sphere presses the base end of the arm by the urging force of the compression coil spring, and when the engagement arm is repeatedly rotated, the base end of the engagement arm is damaged by the sphere. The plating on the base end of the joint arm was peeled off, and this part was exposed to the outside, which made it unattractive. According to the door guard configured as described above, the spherical position is pressed by the biasing force of the compression coil spring into the concave portion formed in the base end portion of the engaging arm to position the turning position of the engaging arm,
The positioning force by the recess and the sphere is weak. It has been difficult to form the concave portion at a precise position of the base end portion of the engaging arm so that the spherical body is a surface pair. Another example of the conventional door guard is JP-A-7-10325. This door guard relates to an improvement of the door guard of JP-B-4-35490 mentioned above, and is a door guard of JP-B-4-35490. However, after pointing out the problem that the number of parts is large and it is very troublesome to assemble and it takes time to assemble,
While making the most of the advantages of the No. 90 door guard, the number of parts is reduced, the wave washer can be easily installed, and it can be manufactured at low cost. However, the door guard of 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 Kaikaihei No. 7-10325 solves the above-mentioned problems, it is not recognized that the number of parts has decreased because the wave washer is simply installed, and the manufacturing cost is low. Is not recognized as being reduced. Therefore, there is a problem to solve the above-mentioned problems of, ... While making full use of the advantage of the door guard of Japanese Utility Model Publication No. 4-35490. As other examples of conventional door guards, there are Japanese Utility Model Laid-Open No. 5-52154 and Japanese Utility Model Laid-Open No. 5-52155. These door guards are constructed by narrowing the base end portions of the engaging arms. Since it is necessary to fit the shaft part integrally formed on the outer surface of the end part into the shaft hole of the bearing bracket part of the arm mounting base, there is a limit to increasing the rigidity of the engaging arm, and therefore, there is a strong limit. When a force is applied, one or both of the spread between the bearing brackets of the arm mounting base and the narrowing between the base ends of the engaging arms occurs, and the shaft on the outer surface of the base end of the engaging arms causes the arm mounting base to move. There is a risk of escape from the shaft hole of the bearing bracket of the table. In addition, the leaf guard of the door guard of Jitsukaihei 5-52154 has an exposed leaf spring, which makes it unattractive.
The color tone could not be unified, and the positioning and fixing force could not be obtained sufficiently. 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 bends. There is a concern that it may escape together with the problem, and the unevenness of the bracket of the arm mounting base is largely exposed, which makes it unattractive in appearance. The present invention has been devised in view of the above-mentioned point, and the arm and the rotary shaft are integrally formed and assembled from the bottom surface of the arm mounting base so that the rotary shaft is plated to the rotary shaft without being exposed to the outside.・ The color tone of the appearance without painting (including texture)
The purpose of the present invention is to provide a door guard with a large spring force and a large arm holding force with a structure in which the peeling of the arm plating is not exposed to the outside, the number of parts is small, and the assembly is easy. As a means for solving the above-mentioned problems, the present invention provides that the base end portions 10a, 10a on both sides of the U-shaped engagement arm 10 are the door D or the door shaft. The arm mounting base 20 fixed to either one of the frames W is sandwiched between the two bearing bracket portions 20b, 20b, and the base end portions 10a, 10a on both sides are pivotally attached by the two rotary shafts 12, 12. With the door D fully closed, the door D is inserted into the slit inlet 11a between the base ends 10a and 10a of the engaging arm 10.
Alternatively, the hook 30 fixed to the other one of the door vertical frames W
When the door D is opened with the head portion 30b of the hook 30 being in a state of being inserted, the connecting portion 30c of the hook 30 having a smaller sectional shape than the head portion 30b is inserted into the U-shaped slit 11 of the engaging arm 10. In the door guard that stops contact with the depth end of the slit to limit the opening angle of the door D to a small extent, the rotary shafts 12, 12 on both sides are convex on the outer surfaces of the base end portions 10a, 10a on both sides of the engaging arm 10. The arm mounting base 20 has a recess 20c formed so as to engrave the inside of the two bearing bracket portions 20b, 20b from the bottom surface of the flange portion 20a, and opens between the two bearing bracket portions 20b, 20b. The engaging arm 10 is inserted into the opening 20d from the bottom surface of the flange portion 20a so that the rotary shafts 12, 12 on both sides are housed in the recess 20c. The present invention provides a door guard characterized in that the elastic body is mounted in the recess 20c so that the urging force of the elastic body acts in a direction in which the rotary shafts 12, 12 do not escape from the recess 20c. Preferably, in the present invention, the pressing members 41, 41 and the compression coil springs 42, 42 as the elastic bodies are sequentially stacked on the rotary 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 recess 41a formed from the bottom surface, and the compression coil spring 4 is provided in the recess 41a.
2 and 42 are accommodated, and the side surfaces are sandwiched between the inner wall of the bearing bracket portion 20b, the stepped portion 43b of the cover 43, and the inner wall of the bearing bracket portion 20b, and are guided in a direction orthogonal to the rotating shaft 12. The present invention provides a door guard that is characterized in that Preferably, according to the present invention, on the surface of the pressing member 41 that abuts on the rotary shaft 12, the rotary shaft positioning ridge 41b is convex so that the ridge direction is along the axial direction of the rotary shaft 12. The rotary shaft 12 is provided with a plurality of recessed portions 12a, 12b, 12c, and the engaging arm 10 is locked at a predetermined position within a range of 90 ° to 180 ° from the locked position. The present invention provides a door guard characterized in that, when swung to the unlocked position caused, any one of the concave streak portions 12a, 12b, 12c is arranged to face-pair with the convex streak portion 41b. A first embodiment of a door guard according to the present invention will be described below with reference to FIGS. 1 to 4. FIG.
As shown in (a) or (b), this door guard
Arm mounting base 20 for pivotally supporting the U-shaped engagement arm 10
Is fixed to either the door D or the door vertical frame W by a screw 50, and the U-shaped slit 11 of the engaging arm 10 is fixed.
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 or the door vertical frame W by a screw 51 in correspondence with the engaging arm 10 and the door is fully closed. When it is swung so as to cover the hook 30, as shown in FIG.
The head portion 30b of the hook 30 is located in the slit entrance portion 11a between the base end portions 10a and 10a of the engaging arm 10 shown in FIG. The 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 contacting with the slit depth end to limit the opening angle of the door to a small value. As shown in FIG. 2, the engaging arm 10 includes a rotary shaft 1 integrally formed on the outer surfaces of the base end portions 10a, 10a.
2, 12 are formed in a U shape. The engaging arm 10 is formed in a U shape and has the slit 1
The slit inlet portion 11a is formed by ensuring that the distance between the base end portions 10a, 10a, which are the inlets of the first, is slightly larger than that of the head portion 30b of the hook 30, and is the slit inlet portion 11a.
The slit width on the back side of 1a is the head portion 30b of the hook 30.
And smaller than the connecting portion 30c of the hook 30. The arm mounting base 20 has a flange portion 20a.
The two bearing bracket portions 20b, 20b are formed in an integral shape, and have a recessed portion 20c formed so as to engrave the inside of the two bearing bracket portions 20b, 20b from the bottom surface of the flange portion 20a and the two bearing bracket portions. It has an opening 20d that opens between the 20b and 20b. As shown in FIGS. 2, 3 and 4, the engagement arm 10 and the arm mounting base 20 have the U-shaped tip end of the engagement arm 10 of the arm mounting base 20. The rotary shafts 12 and 12 on both sides of the engagement arm 10 are inserted into the opening 20d from the side of the flange portion 20a to be housed in the recesses 20c of the arm mounting base 20, and the pressing members 4 are attached to the rotary shafts 12 and 12, respectively.
1, 41, then compression coil springs 42, 42
And the projections 43d and 43d are provided on the cover 43 inward so that the compression coil springs 42 and 42 are not displaced.
The cover 43 is fitted in the recess 20c of the arm mounting base 20 and fixed by screws 44, 44 so that the compression coil springs 42, 42 are compressed and biased. The pressing member 41 has a recess 41a formed from the bottom surface, and the compression coil springs 42, 4 are provided in the recess 41a.
It accommodates the half of 2 and the side surface is the bearing bracket portion 20.
It is sandwiched between the inner wall of b and the stepped portion 43b of the cover 43 and the inner wall of the bearing bracket portion 20b, and is guided in a direction orthogonal to the rotating shaft 12. Therefore, since the pressing member 41 does not incline in the lateral direction, the engaging arm 10 is swung to rotate the rotating shaft 12, and the dimension from the rotation center of the non-circular rotating shaft 12 to the contact portion with the pressing member 41 changes. Accordingly, the pressing member 41 can move smoothly. Further, according to the structure in which the pressing member 41 is pressed against the rotating shaft 12 instead of being pressed against the base end portion 10a of the engaging arm 10, the compression coil spring 42,
Since the half of 42 is accommodated, a large length of the compression coil spring 42 can be secured. As shown in FIGS. 1 (a), 1 (b) and 4 (e)-(h), the direction in which the ridges / recesses of the rotary shaft 12 are in contact with the rotary shaft 12 of the pressing member 41 is the direction of the rotary shaft 12. The protruding portion 41b for positioning the rotating shaft is provided so as to extend along the axial direction so that the sectional shape of the protruding portion 41b at any position in the direction perpendicular to the rotating shaft 12 has the same shape. The rotary shaft 12 is provided with three protrusions 12a, 12b, 12c, which are provided in a protruding manner. As shown in FIGS.
To a locked position with a turning angle of 0 ° indicated by a solid line, an unlocked position indicated by a one-dot chain line caused by 90 ° from the locked position, and an unlocked position indicated by a two-dot chain line caused by 90 ° from the unlocked position. Then, any one of the concave streak portions 12a, 12b, 12c engages the convex streak portion 41b with the four planes index-engaged with each other in a surface-paired state for accurate positioning. In this case, for example, the ridge portion 41b
In the operation process in which the engaging arm 10 disengages from the recessed ridge 12a and engages with the adjacent recessed ridge 12b, the biasing force of the compression coil spring 42 acts on the pivoting movement of the engagement arm 10 with a snap action. Positioning is performed. In addition,
A cylindrical convex curved surface 12d of a quarter arc is formed on the rotating shaft 12, and the bearing bracket portion 20b of the arm mounting base 20 is
20C is a surface pair of the cylindrical convex curved surface 20c 'of the half arc of the concave portion 20c formed so as to engrave the inside of 20b,
It is ensured that the engaging arm 10 can stably rotate. The screws 50 for attaching the above-mentioned arm attachment base 20 to a door or a door vertical frame are shown in FIGS. 1, 2 and 4.
As shown in (a) and (d), screw holes 20e and 20e are provided at both ends of the flange portion 20a of the arm mounting base 20.
And through the screw hole 43a provided in the central portion of the cover 43. Next, a second embodiment of the door guard according to the present invention will be described with reference to FIG. This door guard
The rotating shaft 12 is formed in the shape of an angular axis having a cylindrical convex curved surface 12d of a quarter arc and three flat surfaces 12e, 12f, 12g, and the surface of the pressing member 41 contacting the rotating shaft 12 is a flat surface 41c. Has become. When the biasing 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
The leaf spring 4 bent in a U shape in place of the pressing member 41 of the door guard and the compression coil springs 42, 42 of the first embodiment.
5 is the only difference from the door guard of the first embodiment. Next, a modified example 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 can be commonly used for both a single-door door and a parent-child door. The engaging arm 10 may have a swivel angle between the locked position and the unlocked position of not 90 ° but 180 ° or an appropriate obtuse angle. It suffices that the elastic body is provided so as to urge the rotating shaft 12, and the elastic body itself is the recess 20 c of the arm mounting base 20.
The cover 43 need not be provided as long as the structure is locked to the. The surfaces forming the ridges 41b and the ridges 12a, respectively, are composed of four planes in the figure, but may be composed of a plurality of planes, and the surface pair of the cylindrical convex surface and the cylindrical concave surface may be formed. May be As described above, according to the door guard of the present invention, the engaging arm 10 is provided with the rotary shaft 12 on the outer surface of the base end portions on both sides, and the flange of the arm mounting base 20 is provided. Insert the engaging arm 10 from the bottom surface of the portion 20a to rotate the rotary shaft 1
2 is concealed inside the bearing bracket portion of the arm mounting base 20, and the elastic body biases the rotating shaft 12 instead of the base end portion of the engaging arm 10 so that the elastic body is also concealed. Therefore, the conventional door guards that are assembled by bending and narrowing the base end portions on both sides of the engaging arm and sandwiching them between the bearing bracket portions of the arm mounting base and inserting the pin that is the rotating shaft No. 35490, Actual Kaihei 7-1
Compared with No. 0325), the assembly is easier, the number of parts is smaller, and the manufacturing cost can be reduced. The elastic body mounting space is double the size of the conventional one.
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 U-shaped bent leaf spring, a large radius of curvature and a large thickness can be adopted. Since the urging force can be increased, the positioning and holding force of the arm can be increased and the snap action of the arm can be strengthened. The rotating shaft 12 can be formed integrally with the engaging arm 10 to rotate. Plating applied to the base end portion of the engaging arm 10 eliminates the conventional disadvantage of separately plating the shaft 12 and the engaging arm 10 and makes it easy to unify the color tone (including texture) of the appearance. Is not peeled off, and even if the plating applied to the rotary shaft 12 is peeled off, it is concealed inside the bearing bracket portion of the arm mounting base, so the appearance does not deteriorate. . Also,
According to the door guard of the present invention, the base end portions on both sides of the engaging arm having the rotary shaft projecting on the outer surface of the conventional base end portion are bent and narrowed to be sandwiched between the bearing bracket portions of the arm mounting base. Door guards that restore the dimensions of the base end portions on both sides of the engaging arm so as to widen and fit the rotary shaft into the shaft hole provided in the inner surface of the bearing bracket portion (No. 5-52154, No.
52155), it is possible to give the engaging arm 10 sufficient rigidity,
Even if a large door opening force is applied, there is no fear that the rotating shaft will escape. Positioning of the locking position and the unlocking position of the engaging arm 10
A concave streak portion 12a provided on the rotary shaft 12 of the engagement arm 10;
This is performed by the surface pair with the ridge portion 41b provided on the pressing member 41, and the ridge direction of the ridge portion 12a and the ridge portion 41b
When the ridge direction is configured to be along the axial direction of the rotation shaft, the spherical body is pressed against the recess provided in the base end portion of the engaging arm to lock and unlock the engaging arm. As compared with the conventional door guard that has performed the positioning of the position, a large force for positioning and fixing the engagement arm between the locked position and the unlocked position can be secured, 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 attached to a door and a door vertical frame. FIG. 2 is an exploded perspective view of the door guard according to the first embodiment of this 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, in which (a) is a longitudinal sectional view and (b) is a side view. FIG. 4 is a detailed view of the door guard according to the first embodiment of the present invention, in which (a) is a front view, (b) is a bottom view, (c) is a view taken along the line cc in (b), (d) is a sectional view taken along the line aa in (a), (e) is a sectional view taken along the line ee in (d),
(F) is the same cross section as the ee cross section, and the engagement arm is 4
5G is a view in a state of being inclined by 5 °, (g) is a view in the same cross section as the ee cross section and in a state where the engaging arm is raised at a right angle. FIG. 5 is a detailed view of the door guard according to the second embodiment of the present invention and is a cross-sectional view corresponding to FIG. 4 (e). 6A and 6B are detailed views of a door guard according to a third embodiment of the present invention, in which FIG. 6A is a partially sectional bottom view and FIG. 6B is a side view. [Explanation of Codes] D ... Door, W ... Door vertical frame, 10 ... Engaging arm 10a ... Proximal end portion, 11 ... Slit, 11a ... Slit inlet portion, 12 ... ..Rotary shafts, 12a, 12b, 12c ... Recessed portions, 20 ... Arm mounting bases, 20a ... Flange portions, 20b ... Bearing bracket portions, 20c ... Recessed portions, 20d ... -Opening, 30 ... Hook, 30b ... Head, 30c ... Connecting part, 41 ... Pressing member, 41b ... Convex part, 42 ... Compression coil spring, 43 ... Cover , 45 ... leaf springs,

Claims (1)

Claims: 1. Between two bearing bracket portions of an arm mounting base in which base ends on both sides of a U-shaped engaging arm are fixed to either a door or a door vertical frame. It is sandwiched and the base ends on both sides are pivotally attached by two rotary shafts, and in the state where the door is fully closed, in the slit entrance between the base ends of the engaging arms, on either the door or the door vertical frame. When the head of the hook to be fixed is positioned so that the head is inserted and the door is opened, the connecting portion having a smaller cross-sectional shape than the head of the hook is inserted into the U-shaped slit of the engaging arm. In a door guard that stops contacting at a depth end and limits the opening angle of the door to a small extent, the rotation shafts on both sides are provided on the outer surfaces of the base end portions on both sides of the engagement arm, and the arm mounting base is a flange. Go inside the two bearing bracket parts from the bottom of the part And an opening that opens between the two bearing bracket portions, and has an engaging arm that is inserted through the opening from the bottom surface of the flange portion to accommodate the rotary shafts on both sides in the recess. A door guard, wherein the elastic body is mounted in the recess so that the biasing force of the elastic body acts in a direction in which the rotary 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 as to urge the compression coil spring, and the pressing member has a recess formed from a bottom surface, A half portion of the compression coil spring is housed in the recess, and the side surface is sandwiched between the inner wall of the bearing bracket portion, the stepped portion of the cover and the inner wall of the bearing bracket portion and guided in a direction orthogonal to the rotation axis. The door guard according to claim 1. 3. A ridge portion for positioning a rotary shaft is provided on the surface of the pressing member that abuts the rotary shaft so that the ridge direction is along the axial direction of the rotary shaft. A plurality of recesses are provided in the recess, and when the engaging arm is pivoted to a locking position and an unlocking position caused by a predetermined angle within a range of 90 ° to 180 ° from the locking position, The door guard according to claim 2, characterized in that either one of the two faces is evenly paired with the ridge.