JP6279790B2 - Double arch type buckling leaf spring device and magnet catch using it - Google Patents

Description

The present invention relates to a double arch type buckling plate spring device in which an arched type buckling phenomenon is applied to a substantially elongated plate spring, and a magnet catch using the same.

In general, the snap-through phenomenon (hereinafter referred to as “flying buckling”) is explained as “a phenomenon of dynamic transition from one balanced state of load to displacement to another stable balanced state that is not continuous with it”. ing. In addition to the application to conventional microswitches and other light and thin parts (see Reference 1), the application of this phenomenon has recently been attracting attention in the self-deployment structure of solar power generation panels for space equipment. The most basic example of this phenomenon is what is called "William Toggle" in many textbooks on structural mechanics. As shown in FIG. 7 (A), both ends of the flat spring are held by hinges, and the distance between the both ends is compressed within the elastic region, whereby the flat spring is bent in an arch shape to the front side or the back side. . When the positions of both ends are fixed and the center part of the leaf spring that is the front arch is pushed in a direction perpendicular to the spring, the center part is deformed into a concave shape, but when the load increases beyond a certain level, the arch suddenly reverses. It becomes an arch to the back side as shown in the figure, and it is stable and stationary.
Next, when a reverse load of a certain level or more is applied to this (tensile), it follows the deformation path opposite to the above and returns to the original state and stops still. In this example, removal of compression across intervals, leaf springs you naturally return to the original mere flat plate (hereinafter, referred to as "flat type" This method here).

On the other hand, the jump buckling phenomenon is applied as a single item to daily necessities such as a hair clip and a dress clip in the elongated leaf spring field and is commercially available. In these products, as described in Patent Document 2, a central part of the inner width of the leaf spring is partially cut away at the end so that an approximately dome-shaped arch shape can be formed without compressing the distance between both ends. Ingenuity such as applying special processing has been made (hereinafter, this method is referred to as a “hollowing method”). As shown in FIG. 7B, such a leaf spring causes smooth jump buckling unless the both ends are freely swingable (X) and the distance between both ends (Y) is free to expand and contract. hard.
The in "arcuate flight transfer seat屈板spring" in the present invention are those including these two methods, if a leaf spring that occurs flight transfer buckling, though the formation method of the arch Make it not exist.

As shown in FIGS. 7A and 7B, the leaf spring behaves on one stable path on the front side of the reference line connecting both ends, and this becomes the first deformation path. If this occurs and buckling occurs and reverses, it behaves on another stable path on the back side, and this becomes the second deformation path. A plate spring homogeneous flat, if the swing resistance is zero at both ends, their front and back surfaces of the deformed symmetrically with respect to the reference line (in the load versus displacement curve, point symmetry relative to the midpoint of the two deformation path) Therefore, although the leaf spring is a single spring, it has a far greater displacement than a normal leaf spring and can repeat the actions of two opposing springs. However, there is an unstable region between the two deformation paths, and there is a possibility that deformation other than the expected reversing arch may occur without any ingenuity.

When the center of the arch is pushed like this, the leaf spring of the feature that reverses instantaneously due to jumping buckling and stably stops at zero external force, and reverses and returns to its original state when a reverse load of a certain level or more is applied thereto , It is a unique existence. However, in particular, the hollowed-out type is not widely used as a machine element, such as those that are supported at both ends. In the case of a flat plate type, it is easy to apply a large burden on both ends support, and it is necessary to control deformation in an unstable region in any method. This seems to be a cause.

On the other hand, a conventional magnet catch with a simple structure in which a magnet is arranged on one of a door and a door frame and an iron piece is arranged on the other is referred to as a process of opening the door (hereinafter referred to as “when the door is opened”. However, when the door is completely separated from the door frame, it is described as “when the door is opened”), which requires a little strong force at a stretch. For particularly light sliding doors, the process of closing the door (hereinafter referred to as “when the door is closed”, whereas when the door is closed and completely stationary, it is referred to as “when the door is closed”) Although there is a problem that a gap is easily formed due to secular change including a door frame, etc., a magnet catch is hardly used because of the weak point.
In order to solve these problems, various products have already been developed and spread, but it seems that there are still few that can be easily and inexpensively attached to existing doors. As one of the countermeasures, an arch-shaped staggered seat is provided in which a cantilevered plate spring is disposed on the magnet catch receiving side of the magnet catch, and the main portion of the leaf spring causes a buckling in both front and back directions. An invention of a structure for forming a bent spring (Patent Document 2) has been made.
In the present invention, since the leaf spring fixes only one end as shown in FIG. 7C, the distance between both ends is not a problem. The both end portions are made to be freely movable in the front and back direction by having a certain length or more from the main body end.

Japanese Patent No. 4198494 Japanese Patent No. 5690007 Japanese Patent No. 5008035

In this way, the arched buckling leaf spring has some unique characteristics. Therefore, if it can be applied more easily, a machine element utilizing this characteristic can be used as a general mechanical instrument. There seems to be many possibilities that can be exploited inside. As a specific example, there is a “buffer device” disclosed in Patent Document 3. This is characterized by a structure in which two elastic bodies are connected in a mountain shape by a hinge or the like at the center to cause jumping and buckling, and a plurality of pantographs are stacked together with a fluid damping mechanism. However, if a leaf spring such as that described above can be realized, it can be considered that it can be used in the apparatus at a lower cost by adding some contrivance to the mounting method.
In the magnet catch described in Patent Document 2, since the distance from the spring fixed end to the magnetic receiving portion is substantially the entire length of the spring, the operation noise tends to increase, and the magnetic receiving portion is a circle with the fixed end as a fulcrum. Because it moves in an arc shape, it is easy for both to slide when attached to and detached from the magnet, and there are concerns about wear due to the combination of adsorption and sliding. It can be seen.

The problem to be solved by the present invention is that the arched buckling leaf spring used as a mechanical element can be supported at both ends even by the hollow type, and the both ends support load is reduced at the flat type. In any method, the application is facilitated while preventing unnecessary deformation during buckling and buckling. As a simple application example, this is applied to a magnet catch for a door opening / closing device, further reducing the operating noise and eliminating the sliding between the magnet and the magnetic receiving part, while making the door opening / closing smaller and softer. It is intended to provide a relatively simple door closing device that realizes the above, reduces the chance of generating a gap even with respect to a sliding door, and can be easily attached to an existing door.

According to the first aspect of the present invention, a seat body, which is a rigid member having a fixed dimension, is fixed to the central portion of a substantially elongated plate spring, and both plates serving as two portions between the leaf spring center portion and the leaf spring end portion. The spring main body is geometrically symmetric with respect to the center line in the width direction of the leaf spring, and is compressed into a longitudinal direction to form an arch shape,
Alternatively, after part of the inner width of the two leaf spring main parts is cut out, it is formed into a substantially dome shape, or the arch-shaped jump is formed so as to cause buckling in both front and back directions. the seat屈板spring to each formation,
Comprising guide means for restricting the movement of the seat body in a direction perpendicular to the leaf spring;
Forming a cushion part with a bent cross section on both ends of the leaf spring or on a support plate fixed and extended to them, supporting both ends of the leaf spring,
Alternatively, a substantially concave back plate spring is provided on the back side of the plate spring, and both ends of the back plate spring and the plate spring are connected to each other by a connecting tool that can freely move in the front and back directions, and the center portion of the back plate spring Support
A double-arch type jumping buckling leaf spring characterized by causing the both leaf spring main portions to cause jump buckling in the same direction at the same time by a load of a certain level or more on both sides of the seat. Device.

According to a second aspect of the present invention, there is provided the double-arch type buckling plate spring apparatus according to the first aspect, characterized in that it comprises means for adjusting the distance between the support portions at both ends of the plate spring.

According to a third aspect of the present invention, a part of the constituent members or means in the double arched buckling leaf spring device according to the first or second aspect is a part of a device to which the leaf spring device is attached. And a double-arch type buckling leaf spring device shared by both devices.

According to a fourth aspect of the present invention, in the door opening and closing device, the mechanism for moving the door at right angles to the side wall or door contact of the door frame when opening and closing is the above-mentioned guide means. The transition buckling leaf spring device is fixed to one of the door or door frame, and a magnet is arranged on the other side opposite to it.
Fix the magnetic receiving part to the central part of the leaf spring or the seat body,
By making the attraction force of the magnet more than the force that causes the buckling of the leaf spring,
Each time the door is opened and closed, a jumping buckling in both the front and back directions is caused sequentially on the leaf spring.

According to the double-arch type jumping buckled leaf spring device according to claim 1, a rigid member having a constant dimension is provided at the center of the leaf spring (hereinafter referred to as “main leaf spring” in order to be distinguished from the back leaf spring). The seat body is fixed, and the two main plate spring main parts adjacent to each other are geometrically symmetrical with respect to the center line in the width direction of the main plate spring , and are arch-shaped jump buckled plate springs using a flat plate method or a hollow method. the from respectively formed, such main plate spring central portion, so that one buckling to occur substantially flight transfer buckling in the same direction simultaneously on both the main plate spring main portion draws the other hand, acts strongly.
However, since the main leaf spring main part is separated into two parts by itself, if the load on the central part of the main leaf spring is more than a certain amount offset or tilted from the center, only one of the main parts will fly. In some cases, the main leaf spring becomes S-shaped and the inverted arch shape cannot be obtained. Therefore, since the guide means (hereinafter referred to as “right angle guide”) for restricting the movement of the seat body to the right angle direction of the main leaf spring is provided, the load on the seat body works equally in the right angle direction, and the S-shape of the main leaf spring. Can be prevented more reliably.

When the cushion portion is provided, the main leaf spring can be supported at both ends so that the front and back directions can be swung freely and the distance between both ends can be expanded and contracted. While supporting the shape of a double wing, it is possible to smoothly cause arch-shaped jump buckling in both the front and back directions while reducing the load on the main leaf spring both ends support portion.
In addition, when providing the above-mentioned back plate spring, both ends of the main plate spring and the back plate spring are connected together via a connecting tool so that the front and back direction can be swung freely. Therefore, the distance between both ends can be expanded and contracted, and the both ends of the main leaf spring can be supported relatively easily. Further, when the cushion portion is provided, the entire length of the device is naturally increased by that amount, but when the back plate spring is used, there is an advantage that it can be shortened. The "substantially concave shape" of the above-mentioned back plate spring includes an arch shape, for example, a polygon or the like as long as it is concave on the back side, and is not limited to the cross-sectional shape, and if necessary, it is divided into two near the center. It may be separated.
The device of the present invention having such a configuration is a process in which a buckling occurs by jumping to either the front or back side by a load of a certain level or more on the seat body, and then resting in the same manner, and reversely returning to the other one in the same manner. Can be repeated.

According to the second aspect of the present invention, in the first aspect of the invention, in the case of the structure in which the distance between both ends is compressed to form an arch (that is, a flat plate type), the distance between the both end support portions of the main leaf spring is adjustable. Thus, it is possible to adjust the magnitude of the load, the maximum deformation amount, etc. required to cause the main leaf spring to jump and buckle.

According to a third aspect of the present invention, a part of the constituent members or means in the double arch type buckling leaf spring device according to the first or second aspect is a part of the device to be mounted of the leaf spring device. And is shared by both devices, the structure of the main body of the leaf spring device can be simplified while being exactly the same as the operation of the invention device according to claim 1 or claim 2 described above.

The invention according to claim 4 is a magnet catch used in a door opening / closing device equipped with the leaf spring device. In any door opening / closing device, the door always moves at right angles to the side wall or door contact of the door frame when opening and closing, and this corresponds to the right angle guide according to claim 1. Therefore, the leaf spring device in this case is also an application example of the invention described in claim 3.
According to the present invention, the distance from the magnetic receiving portion (hereinafter referred to as “receiving portion”) to the main leaf spring fixing portion is substantially half of the length of the main leaf spring, so that it is clearer than the case of the cantilever support structure. The operation noise is easily suppressed. Also, when the door is opened, the receiving part protrudes, and when the door is closed, the main leaf spring acts as a brake to soften the momentum of the door. Against this, when the door is pushed in with a certain force or more, the main leaf spring jumps and buckles. This causes the arch to reverse and attracts the door to the frame. When the door is opened, the magnet's attracting force is greater than the force that causes the main leaf spring to jump and buckle.Therefore, the main leaf spring is bent until the front buckling occurs while the receiving part is attracted to the magnet. Relieve resistance.
In this way, the door springs can be opened and closed smoothly, and not only the chance of gaps in the sliding doors is reduced, but also the support at both ends improves the structural strength compared to the cantilever support. The effect of can be obtained.

It is sectional drawing (A) and front view (B) for demonstrating Example 1 of this invention. It is sectional drawing at the time of front side arch (A) and the time of back side arch (B) for demonstrating Example 2 of this invention. It is sectional drawing (A) and front view (B) for demonstrating Example 3 of this invention. It is the perspective view which partially decomposed | disassembled and showed the surroundings of the main leaf | plate spring 1 for demonstrating Example 4 of this invention. It is sectional drawing in the centerline of the main leaf | plate spring 1 for demonstrating Example 4 of this invention. FIG. 10 is a partially exploded perspective view for explaining a fifth embodiment of the present invention. It is a conceptual diagram for demonstrating the support method of an arch-shaped buckling leaf | plate spring.

Supports both ends while reducing the load on the fixed part in other devices so that it can be easily used as a mechanical element for both the hollow type and flat plate type arched buckling leaf spring devices, and loads at the center It was supposed to be possible. In addition, by applying this leaf spring device, the operating noise can be further suppressed, the door can be opened and closed smoothly without sliding between the magnet and the receiving part, and the chance to generate a gap in the sliding door is reduced. The magnet catch has been realized so that it can be easily retrofitted.

FIG. 1 shows an embodiment in which a rod-shaped right-angle guide 8 is provided at the center of a main leaf spring 1 in the inventive device according to claim 1 or 3 and mounted in a base 10 of another device, and (A) is a main leaf spring. Sectional drawing in the longitudinal direction centerline of 1 and (B) are front views. A support plate 5 having a slightly better workability is fixed to both main plate spring end portions 1C by a caulking material 15, and a cross section thereof is bent into a V shape to provide a cushion portion 5A having appropriate elasticity. The cushion portion 5A has not only the ability to expand and contract the distance between both ends of the main leaf spring 1, but also the function of allowing the front and back direction to swing. Although it is not related to the cross-sectional shape, a V shape like this example seems to be most advantageous.
When the main leaf spring 1 is a flat plate type, the distance between both ends is compressed to form the arch of both main leaf spring main portions 1A, so that a constant load is originally applied to the screws 13 of the both end fixing portions. The side wall of the base 10 receives most of it. When the load is applied to the seat body 3, the cushion portion 5A absorbs most of the deformation in the both end directions due to the flying buckling, so that the additional load in the both end directions can be significantly reduced. However, in this structure, the main leaf spring 1 may be a hollow type, and in that case, there is no load on the screw 13 for forming a substantially dome-shaped arch.
The main plate spring central portion 1B passes through the center thereof, and a flanged rod-shaped right angle guide 8 is fixed in a right angle direction with the seat body 3 interposed therebetween, and slides in a hole provided in the mounting base 10. .

FIG. 2 is a cross-sectional view of an embodiment using an arch-shaped back leaf spring 2 in the inventive device according to claim 1 or 3, and FIG. 2A is an arch shape (flat plate system ) in which the main leaf spring 1 is directed to the front side. either good) medium exclusion method and, (B) shows a state in which form the arcuate back side. Although the center portion of the back plate spring 2 is fixed to the mounting base 10 with two screws 13, the center portion of the back plate spring 2 may be appropriately widened to facilitate the fixing operation of the screws 13. A U-shaped right-angle guide 9 is fixed to the central portion of the main leaf spring 1 with the seat body 3 interposed therebetween, and both ends thereof slide on the side walls of the base 10 to move the seat body 3. It is designed to limit to the right angle direction.
As shown in FIG. 2 (A), when the main leaf spring 1 forms an arch shape to the front side, the back leaf spring 2 and the two arch shapes face each other and are connected by a hinge as a connecting tool 7. When a load is applied to the back side, the main leaf spring 1 and the back leaf spring 2 both resist and become a cushion, and the center leaf spring 1 instantly becomes a load with a load exceeding a certain level, although the distance between the center portions is reduced. As a result, the buckling occurs, and the plate is rested in the same direction as the back plate spring 2 as shown in FIG. Now subjected to a tensile load to the front side, after working to both the resistance as an inverted cushion occurred flying transfer buckling at a predetermined load or greater, it returns to the original state.
In this way, the present embodiment works in the same way as in the first embodiment, and both leaf springs are integrally deformed in both end directions without a cushion portion, so that the length of the leaf spring device is longer than that in the first embodiment. Can be shortened.
As shown in the above two embodiments, the device according to the present invention supports both ends in the form shown in FIG. 7B regardless of the arch formation method of the main leaf spring 1, and reduces the load on both ends. Even when the load on the seat body 3 is deviated or inclined from the center, the S-shaped deformation of the main leaf spring 1 is surely prevented by the action of the right-angle guide 8 or 9, while the other two devices are not affected. The two opposing springs can be repeated.

FIG. 3 shows an embodiment in which the cushion portion 5A and the rod-shaped right angle guide 8 are provided in the inventive device according to claim 2 or 3, wherein (A) is a sectional view taken along the center line of the inventive device, ) Is a front view. As shown in the figure, the upper end of the L-shaped end base 20 made of a relatively thick steel plate is fixed to the cushion portion 5A, and a space adjusting screw 21 is attached in the vicinity of the lower side portion thereof, whereby the end base 20 The lower side slides in a groove between the left and right end base holding plates 22 and the base 10 so that the distance between both ends of the main leaf spring 1 can be adjusted. Thereby, the magnitude | size of the load required for the flat plate-type main leaf | plate spring 1 to jump and cause buckling, the maximum deformation amount, etc. can be adjusted.
In this figure, the cushion portion 5A is shown as an extension of the main leaf spring 1, but when such processing is difficult, the support plate 5 may be fixed as in the first embodiment.

FIG. 4 is a partially broken view of the main plate spring 1 of the embodiment in which the main plate spring 1 is a hollow type in the magnet catch according to claim 4 and the cushion portions 5A are attached to both support plates 5 by cross-sectional bending. It is the perspective view shown. The main plate spring 1 is cut out from the spring plate material to a required size, the main plate spring central portion 1B is set to a size sufficient for fixing the seat body 3, a part of the inner width of the upper and lower remaining portions is cut out along the center line, and the left and right are separated. Thereafter, the left and right sides of the main leaf spring end portion 1 </ b> C are brought together toward the center line and are caulked with the caulking material 15 together with the support plate 5. As a result , arch-shaped jumping buckling leaf springs each having a substantially dome shape are formed on the two main leaf spring main portions 1A, respectively, so that jumping can occur in both front and back directions.
The receiving portion 3A made of thick iron pieces is fixed to the main leaf spring central portion 1B with screws 14 with the seat body 3 sandwiched at the central portion thereof. When the door 3 is closed, the seat 3 must have an appropriate thickness so as not to generate contact between the receiving portion 3A and the main leaf spring 1 or a gap between the door and the door frame.

FIG. 5 is a cross-sectional view when the leaf spring device shown in FIG. 4 is attached to a hinged door as one mechanical element of a door opening / closing device using a magnet catch, but may be a flat plate method. The magnet 4 housed in the magnet case 4A is fixed to the upper and lower sides of the door frame 12 as a door stop, and the main plate spring 1 is opposed to the main plate spring 1 at both ends by the support plate 5 and the screw 13 to fix the end seat 6. It is fixed in the horizontal direction on the inner upper and lower ends of the door 11 with the sandwiching therebetween. In the case of a hinged door, the door always moves at a right angle with respect to the magnet 4 which also serves as a door stop when opening and closing, so this mechanism is a right angle guide.
The end seat 6 must have an appropriate thickness so that the main leaf spring central portion 1B and the cushion portion 5A do not contact the door 11 when the door is closed. When the door is opened, as shown in FIG. 4, the main leaf spring 1 has an arch shape to the front side, so that the receiving portion 3A fixed at the center also protrudes, and when pressed by the magnet 4 when the door is closed, the main plate The spring 1 works as a brake together with the cushion portion 5A. When the door 11 is further pushed against it, the main leaf spring 1 jumps and buckles, and forms an arch shape on the back side as shown in FIG. 5 so as to attract the door 11 to the door frame 12.

FIG. 6 shows that the leaf spring device provided with the back leaf spring 2 in the magnet catch according to claim 4 is attached to the front surface of the door 11 which is a sliding door (usually the front upper corner is good) by the L-shaped external fixing bracket 16. It is the perspective view which partly exploded and showed the Example at the time of attaching to the perpendicular direction and fixing the magnet 4 to the position of the doorway frame 12 facing it. The main leaf spring 1 and the receiving portion 3A are fixed with the seat body 3 sandwiched in the same manner as in the fourth embodiment. Furthermore, a substantially arch-shaped back leaf spring 2 is provided on the back side of the main leaf spring 1, and both leaf springs are The both ends are connected by a connecting tool 7. The connection tool 7 is shown as a hinge, and the connection tool 7 and the main leaf spring 1 or the back leaf spring 2 are fixed to each other by a caulking material 15, but the connection tool 7 is not necessarily a hinge, It is also possible to use a simple elastic material.
In FIG. 6, the main leaf spring 1 is shown in a hollow manner, but a flat plate manner is also possible if it is connected to the back leaf spring 2 while being compressed in both end directions. In any case, since the main leaf spring 1 and the back leaf spring 2 are slidably coupled at both ends in this way, the end portions of both leaf springs behave in unison and the distance between both ends can be expanded and contracted. can do.
The center part of the back plate spring 2 and the external fixing bracket 16 is fixed by two screws 14. Such an external method is useful when it is desired to easily retrofit an existing sliding door.
This example is an example of the invention device according to claim 3 together with Example 4, and in the case of a sliding door, the door always moves at right angles to the side wall of the door frame, so this mechanism is a right angle guide, Accordingly, the main body of the leaf spring device can be simplified.

DESCRIPTION OF SYMBOLS 1 Main plate spring 1A Main plate spring main part 1B Main plate spring center part 1C Main plate spring end 2 Back plate spring 3 Seat 3A Receiving part 4 Magnet 4A Magnet case 5 Support plate 5A Cushion part 6 End seat 7 Connecting tool (hinge)
8 (Bar-shaped) Right-angle guide 9 (U-shaped) Right-angle guide 10 Mounting base 11 Door 12 Door frame 13 Screw 14 Screw 15 Caulking material 16 External fixing bracket 20 End base 21 Spacing adjustment screw 22 End base holding plate

Claims (4)

Fixing the rigid member serving as the seat of the constant dimension substantially in the central portion of the elongated leaf springs, both the leaf spring main body portion serving two sites between the plate spring central portion and the plate spring end, the leaf spring Geometrically symmetric with respect to the center line in the width direction and arched by applying a compressive force in the longitudinal direction,
Alternatively, after part of the inner width of the two leaf spring main parts is cut out, it is formed into a substantially dome shape, or the arch-shaped jump is formed so as to cause buckling in both front and back directions. the seat屈板spring to each formation,
Comprising guide means for restricting the movement of the seat body in a direction perpendicular to the leaf spring;
Forming a cushion part with a bent cross section on both ends of the leaf spring or on a support plate fixed and extended to them, supporting both ends of the leaf spring,
Alternatively, a substantially concave back plate spring is provided on the back side of the plate spring, and both ends of the back plate spring and the plate spring are connected to each other by a connecting tool that can freely move in the front and back directions, and the center portion of the back plate spring Support
A double-arch type jumping buckling leaf spring characterized by causing the both leaf spring main portions to cause jump buckling in the same direction at the same time by a load of a certain level or more on both sides of the seat. apparatus. The double-arch type buckling leaf spring apparatus according to claim 1, further comprising means for adjusting the distance between the support portions at both ends of the leaf spring. A part of the constituent member or means in the double-arch type jumping buckled leaf spring device according to claim 1 or 2 is provided as a part of a device to which the leaf spring device is attached, Shared double arch type buckling leaf spring device. In the door opening and closing device, the double arch type buckling leaf spring device according to claim 3, wherein the guide means is a mechanism for moving the door at right angles to the side wall or door contact of the door frame when opening and closing. It is fixed to one of the door or door frame, and a magnet is arranged on the other side facing it.
Fix the magnetic receiving part to the central part of the leaf spring or the seat body,
By making the attraction force of the magnet more than the force that causes the buckling of the leaf spring,
Each time the door is opened and closed, the spring catches the leaf spring in both front and back directions one after another.