KR102173280B1 - Fastening pin with locking structure using elastic plate - Google Patents

Abstract

The present invention relates to a fastening pin with a natural separation prevention function which can be universally used in various industrial machine apparatuses or construction equipment such as an excavator and, more specifically, to a fastening pin for heavy equipment with a natural separation prevention function of a novel form which, for example, prevents a fastening pin installed on a towing ring of an excavator which is one of construction equipment to be coupled to prevent natural separation of a wire connected to the towing ring from being separated by damaging a fastening state by a strong impact or continuous friction with the ground to maintain a stable and firm fastening state. The fastening pin with a stopping structure using an elastic plate comprises: a bar shaped body (10) having a female screw unit (11) and a stopping unit (12) formed on one side thereof; a head unit (20) constructed on one side of the body (10) to have a larger diameter than the body (10); and an elastic plate (30) sticking to the stopping unit (12) and having elasticity to be tightly fixed on the body (10) by a fixing bolt (40) screw-fastened to the female screw unit (11).

Description

Fastening pin with locking structure using elastic plate

The present invention relates to a fastening pin having a locking structure using an elastic plate that can be used universally in various industrial machinery devices or construction machinery such as an excavator, and more specifically described, as an example, traction of an excavator, which is one of the construction machinery Stable and robust fastening because it can physically prevent the fastening pin that is installed on the ring and is connected to prevent the natural separation of the wire connected to the traction ring because the fastening state is damaged by continuous friction or strong impact with the ground. It relates to a fastening pin having a locking structure using a new type of elastic plate capable of maintaining the state.

In general, fastening pins are formed and used in various forms in various industrial machinery such as transportation means such as automobiles and ships, various industrial machinery devices, and construction machinery devices such as excavators and cranes.

For example, various work tools (attachments) such as a bucket and a breaker are attached to the arm tip of an excavator to perform various tasks, and among them, a bucket is attached to perform the most work.It is easy to remove and attach various work devices. To do this, a link with a hydraulic cylinder is widely used.

In addition, a shackle-type traction ring is installed at the front part of the link or the front part of the bucket for lifting or unloading work tools from a vehicle for moving or replacing various work tools that are heavy objects.

That is, one side of a band or wire is inserted into the traction ring and a heavy object is connected to the other side to move the heavy object. However, the traction ring is formed in a shackle shape having an approximately "U" shape in the cross section. Alternatively, a bar used by inserting a wire, in the process of moving a heavy object, frequently occurs in which the connected state such as the band or wire connected to the traction ring is pulled out due to an external shock, and the moving heavy object falls.

As described above, as a conventional technology for preventing natural separation of bands or wires, Korean Patent Publication No. 10-2001-0077668 (published on August 20, 2001) is a detachable device for attachment of a construction machine. An upper bracket having a pin hole for connecting one side and the other side with a pin to an arm, and a hook portion and a locking jaw for connecting one side and the other side with the attachment pin under the upper bracket. A detachable device having a main frame having a lower bracket having a lower bracket, a latch for engaging a pin of the attachment side on the main frame, and a hydraulic cylinder for operating the latch, wherein the upper bracket and the lower bracket of the main frame It is characterized in that the base reinforcing plate bent at least twice is additionally attached between the and the upper and lower brackets to increase the contact area of the upper and lower brackets, thereby distributing the stress generated by the work load on the attachment side to increase the durability.

On the other hand, the patent registration No. 10-1882692 (registration date: July 23, 2018), previously registered by the present applicant, for an excavator with an improved traction ring, has an arm on the inner upper part of the body having a "c" shape. A pair of connecting rods connected to the end of the body, a fixing ring connected to each attachment at the bottom, and a rotation ring connected to the rotating shaft are integrally formed, and a traction ring for moving and lifting various attachments is formed at the front part of the body. In the link for an excavator, the traction ring has a hook shape, a seating hole in which a band or wire connected with a heavy object is seated, and an opening communicating with the outside on one side of the seating hole are integrally formed, and at both sides of the opening A housing in which a primary through hole and a secondary through hole communicating with the groove are formed on the same line, and the opening is opened or closed through each of the through holes, and an insertion groove having a female screw hole on one side and a circular tennis ball on the other side or It characterized in that it comprises a head made of a donut shape, and a fastening pin made of a deformable ring means that is inserted into the insertion groove so that one side protrudes outward from the insertion groove and is assembled in a form capable of natural rotation with a bolt.

However, as a configuration for preventing the separation of the wire connected to the traction ring described in the prior art, a sealing plate is formed to seal the open portion of the traction ring, or a fastening pin is inserted to prevent natural fallout. .

In particular, in the case of the fastening pin invented by the present applicant, the deformation ring means for preventing separation is formed only on one side of the fastening pin, so that the fatigue of the deformation ring means due to the impact applied to the deformation ring means protruding partially is concentrated and easy. There was a problem of being damaged or damaged.

In addition, in the production process of the fastening pin, the production process is complicated and the manufacturing cost is increased due to the large number of processes.

Registered Patent Publication No. 10-1882692 (Registration date: July 23, 2018) "Link for excavator with improved traction ring" Registered Patent Publication No. 10-1050939 (Registration Date: July 14, 2011) "A fastening device of a mount pin for an accessory device of heavy equipment" Unexamined Patent Publication No. 10-2001-0077668 (Publication date: August 20, 2001) "Attachment attachment and detachment device for construction machinery"

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to prevent impact or impact in a state in which the fastening pins used in various industrial machinery such as transportation means such as automobiles and ships or construction machinery devices such as excavators and cranes are fastened. It is possible to stably maintain the fastened state without being separated naturally by vibration. In particular, a new product that allows the operator to easily fasten and separate during installation and separation, while maintaining a firmly fastened state without natural separation in the fastened state. It is to provide a fastening pin having a locking structure using an elastic plate in the form of.

As an example, the band or wire connected to the traction ring formed on the link for an excavator can be easily fastened and separated by one-touch type while preventing the natural fall out due to external impact and at the same time Provides a fastening pin with a locking structure using a new type of elastic plate that is formed on one side of the pin and can physically prevent the separation of the fastening pin by the configuration of an elastic plate having elasticity. Is in.

The fastening pin having a locking structure using an elastic plate according to an embodiment of the technical idea of the present invention for achieving the above object has a rod shape, a body having a locking part and a female thread on one side, and a body on one side of the body A locking structure using an elastic plate, characterized in that it comprises a head composed of a diameter larger than the diameter of and an elastic plate having elasticity that is in close contact with the locking part and fixed to the body by fixing bolts screwed to the female screw part. It can be achieved by a fastening pin having.

In another embodiment of the present invention, in a fastening pin having a locking structure using an elastic plate formed in a link or bucket of heavy equipment and fastened to a traction ring having a hole for moving a heavy object, the locking structure using the elastic plate The fastening pin has a rod shape and has a locking portion having a diameter passing through the hole on one side and a body having a female thread on an end thereof, and a head portion having a diameter larger than the diameter of the body on the other side of the body, It can be achieved by a fastening pin having a locking structure using an elastic plate, characterized in that it includes an elastic plate having elasticity that is in close contact with the locking part and is fastened to the body by a fixing bolt screwed to the female screw part. have.

The elastic plate has an annular plate shape, a second elastic portion consisting of a fixing bolt receiving groove having a through hole formed in the center portion and a V-shaped elastic portion having a "V" cross-section at the edge, and a second elastic portion consisting of an inclined surface and a bent surface. It is characterized in that the elastic part is formed integrally.

It characterized in that it further comprises an annular ring on one side of the body, and a bushing fitted into the inner side of the hole and having an annular groove therein.

The elastic plate is characterized in that a plurality of cutout grooves are formed in the first elastic portion and the second elastic portion at regular intervals so that the first elastic portion and the second elastic portion can be easily stretched and contracted with less pressing force. .

The fastening pin having a locking structure using an elastic plate according to the present invention has an effect that can be used universally in various industrial machinery or construction machinery such as an excavator, and moreover, one side of the fastening pin in the state where the fastening pin is fastened. As the elastic plate and the locking part formed in are completely engaged, the fastening pin has the same level of fatigue as a whole without being concentrated on one side in the fastened state, so that the fastening pin can stably maintain the fastened state without damage or damage.

For example, when a fastening pin is used in the form of closing the opening of a traction ring formed on a link or bucket of an excavator, it is formed in a one-touch fitting type rather than a screw fastening type like a fastening pin, so that the coupling and separation of the fastening pins are separately installed. Installation and separation work can be performed quickly and accurately by the operator without tools. In particular, by the elastic plate formed at one end of the fastening pin and having elasticity that expands and contracts, After being contracted and passed through the hole, it is restored and elongated to a diameter larger than the hole, so it can fundamentally prevent the fastening pin from being naturally separated by external shock or vibration due to physical deformation, ensuring a stable fastening state at all times. There is an effect that can prevent a safety accident caused by the fall of a heavy object by the possible effect.

1 is a perspective view of a fastening pin having a locking structure using an elastic plate according to a first embodiment of the present invention
2 is a perspective view of an elastic plate among fastening pins having a locking structure using an elastic plate according to the first embodiment of the present invention
3 is a cross-sectional view of an elastic plate among fastening pins having a locking structure using an elastic plate according to the first embodiment of the present invention.
4 is a partial cross-sectional view of a fastening pin having a locking structure using an elastic plate according to a first embodiment of the present invention
5 is a view showing a state in which a fastening pin having a locking structure using an elastic plate according to the first embodiment of the present invention is fastened to a traction ring
6 is a view showing a form in which a fastening pin having a locking structure using an elastic plate according to the first embodiment of the present invention is shaken in a state installed on a traction ring
7 is a perspective view of a modified embodiment of an elastic plate among fastening pins having a locking structure using an elastic plate according to the first embodiment of the present invention
8 is a perspective view of a fastening pin having a locking structure using an elastic plate according to a second embodiment of the present invention
9 is a cross-sectional view of a fastening pin having a locking structure using an elastic plate according to a second embodiment of the present invention

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. However, since the description of the present invention is merely an embodiment for structural or functional description, the scope of the present invention should not be construed as being limited by the embodiments described in the text. That is, since the embodiments can be modified in various ways and have various forms, the scope of the present invention should be understood to include equivalents capable of realizing the technical idea. In addition, since the object or effect presented in the present invention does not mean that a specific embodiment should include all of them or only those effects, the scope of the present invention should not be understood as being limited thereto.

Meanwhile, the meanings of terms described in the present invention should be understood as follows.

Terms such as "first" and "second" are used to distinguish one component from other components, and the scope of rights is not limited by these terms. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component.

When a component is referred to as being "connected" to another component, it should be understood that although it may be directly connected to the other component, another component may exist in the middle. On the other hand, when it is mentioned that a component is "directly connected" to another component, it should be understood that there is no other component in the middle. On the other hand, other expressions describing the relationship between the constituent elements, that is, "between" and "just between" or "neighboring to" and "directly neighboring to" should be interpreted as well.

Singular expressions are to be understood as including plural expressions unless the context clearly indicates otherwise, and terms such as "comprises" or "have" refer to specified features, numbers, steps, actions, components, parts, or It is to be understood that it is intended to designate that a combination exists and does not preclude the presence or addition of one or more other features or numbers, steps, actions, components, parts, or combinations thereof.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the field to which the present invention belongs, unless otherwise defined. Terms defined in a commonly used dictionary should be interpreted as having the meaning of the related technology in context, and cannot be interpreted as having an ideal or excessively formal meaning unless explicitly defined in the present invention.

Now, a fastening pin having a locking structure using an elastic plate according to a first embodiment of the present invention will be described in detail with reference to the drawings.

In particular, the fastening pin having a locking structure using an elastic plate of the present invention can be used universally in various industrial machinery or construction machinery such as an excavator, and in the present invention, it is installed on a traction ring formed on a link or bucket of an excavator for convenience. It is described as being, but is not limited thereto, and it is obvious that it can be applied and used in various industrial machinery and construction machinery.

In the accompanying drawings, FIG. 1 is a perspective view of a fastening pin having a locking structure using an elastic plate according to a first embodiment of the present invention, and FIG. 2 is a view having a locking structure using an elastic plate according to the first embodiment of the present invention. A perspective view of an elastic plate among fastening pins, FIG. 3 is a cross-sectional view of an elastic plate among fastening pins having a locking structure using an elastic plate according to the first embodiment of the present invention, and FIG. 4 is a cross-sectional view of the elastic plate according to the first embodiment of the present invention. Fig. 5 is a partial cross-sectional view of a fastening pin having a locking structure using an elastic plate, and FIG. 5 is a view showing a state in which a fastening pin having a locking structure using an elastic plate according to the first embodiment of the present invention is fastened to a traction ring. 6 is a view showing a form in which a fastening pin having a locking structure using an elastic plate according to the first embodiment of the present invention is vibrated in a state installed on a traction ring, and FIG. 7 is a view showing an elastic plate according to the first embodiment of the present invention. It is a perspective view of a modified embodiment of the elastic plate among the fastening pins having a locking structure used.

As shown, the fastening pin (hereinafter referred to as "fastening pin") 100 having a locking structure using an elastic plate according to the present invention includes a rod-shaped body 10 and a body on one side of the body 10 Elasticity that is made of a diameter larger than the diameter of (10) and is tightly fixed to the end of the body 10 by the head 20 that is caught in the hole 210 of the traction ring 200 and the fixing bolt 40 on the other side It consists of an elastic plate 30 having.

The body 10 is formed in a circular or rectangular shape, and a female screw hole 11 is formed at one end to which the fixing bolt 40 is screwed, and may be formed of various materials such as synthetic resin and metal, but preferably a certain weight It can be formed of a metal material to provide.

In addition, one side or both sides of the body 10 to form a locking portion 12 having a diameter larger than the diameter of the body 10 so that the hole 210 of the traction ring 200 is located close and passed Even if the fastening pin 100 is shaken by vibration or shock while it is fastened to the hole 210 of the traction ring 200 after the vehicle, it is primarily prevented from being naturally separated by the locking part 12 To be able to do it.

The head 20 is formed larger than the diameter of the hole 210 so that the body 10 of the fastening pin 100 penetrates the hole 210 of the traction ring 200 and is installed so that it can be prevented from being removed. As shown, it may be configured in a circular shape of an annular shape, a ring shape, or a variety of shapes such as a round head shape.

In particular, in the case of a ring shape, a wire (not shown) can be connected to a link or a bucket (not shown) to prevent loss of the fastening pin, and when formed in a round head shape, the fastening pin 100 ) Is installed on the traction ring and the head is in close contact with the ground and is swept, it has the feature to minimize the damage to the head.

The elastic plate 30 has an annular plate shape, a fixing bolt receiving groove 32 having a through hole 31 formed in the center portion, and a V-shaped elastic portion 33 having a "V" cross-section at the edge. The second elastic portion 34 made of and the first elastic portion 37 made of the inclined surface 35 and the bent surface 36 are integrally formed.

That is, the elastic plate 30 is screwed to the female screw portion 11 through the fixing bolt 40 through the through hole 31 while the central portion of one side is in close contact with the end of the body 10 10) is fixedly installed.

In addition, the elastic plate 30 is deformed to be narrowed inward by the first elastic portion 37 and the second elastic portion 34 in the process of penetrating the hole 210 of the traction ring 200 to be traction. After passing through the hole 210 of the ring 200, the first elastic part 37 and the second elastic part 34 are restored to their original state and expanded, and are caught in the peripheral surface of the hole 210. By having a shape, it has a shape that prevents natural separation.

On the other hand, Fig. 7 shows another modified embodiment of the elastic plate 30 according to the present invention.

The characteristic of the elastic plate 30 of the present embodiment is that the first elastic portion 37 and the first elastic portion 37 and the first elastic portion 37 and the first elastic portion 37 and the second elastic portion 34 are formed with a plurality of cut grooves 38 at regular intervals. 2 It is characterized in that the elastic part 34 can be easily elongated and contracted with less pressing force, so that the operator can easily insert and install the fastening pin 100 with little force or remove it by withdrawal.

Hereinafter, an operation form of the fastening pin having a locking structure using an elastic plate according to the present invention will be described in detail with reference to FIG. 5.

First, the elastic plate 30 is in close contact with one end of the body 10 of the fastening pin 100 and fixed with a fixing bolt 40 to install the elastic plate 30 on the body 10, and the elastic plate 30 side Is pushed into the hole 210 of the traction ring 200 in the insertion direction, in which the elastic plate 30 formed with a diameter larger than the diameter of the hole 210 is inserted into the hole 210 The inclined surface 35 of the elastic plate 30 is in close contact with the inlet side of the hole 210, and the operator forcibly presses the fastening pin 100, so that the inclined surface by the second elastic part 34 and the first elastic part 37 (35) and the V-shaped elastic part 33 are narrowly deformed in the form of constricting inward and inserted into the inside of the hole 210, and after passing through the hole 210, the second elastic part 34 and the second elastic part 34 1 The elastic part 37 is restored to its original state and is expanded to a state larger than the diameter of the hole 210 and is caught by the outer surface of the hole 210, thereby forming the fastening plate 30 in a form that does not easily come off.

As described above, the elastic plate 30 passing through the hole 210 is maintained at a diameter larger than the diameter of the hole 210, so that the fastening pin 100 is not easily removed due to external impact or friction with the ground, and a traction ring ( 200) can be physically firmly maintained.

Moreover, in the state where the fastening pin 100 is fastened to the hole 210 of the traction ring 200 as described above, the elastic plate 30 and the locking portion 12 formed in the body 10 auxiliary By preventing separation, fatigue due to shock or vibration concentrated on the elastic plate 30 may be reduced.

That is, the diameter of the locking part 12 is formed to have a slightly smaller diameter compared to the diameter of the hole 210, so that the fastening pin 100 is on the horizontal line with the hole 210 in order to separate the fastening pin 100. It should be positioned, but the fastening pin 100 is inclined to one side as shown in FIG. 6 due to vibration or impact, so that the locking part 12 passes through the hole 210 and the hole 210 By being caught on the edge side of the fastening pin 100 can be used stably by preventing the natural separation.

Meanwhile, to separate the fastening pin 100 while the fastening pin 100 is coupled to the traction ring 200 as described above, the operator holds the head of the fastening pin 100 and inserts the fastening pin 100 through the hole ( 210) in the same horizontal line as the pulling surface, the engaging portion 12 flows into the hole 210, and then the bent surface 36 of the elastic plate 30 is in close contact with the edge surface of the hole 210 When the operator pulls the fastening pin 100 with a strong force, the first elastic part 37 consisting of the bent surface 36 and the inclined surface 35 in close contact with the edge surface of the hole 210 is constricted inward. It is deformed narrowly, and at the same time, the second elastic portion 34 made of the V-shaped elastic portion 33 is also narrowly deformed in a form that is constricted inwardly, flows into the inside of the hole 210, and continues to be pulled, and the fastening pin from the hole 210 By separating (100) is to separate the fastening pin (100) from the traction ring (200).

Through the configuration of the fastening pin 100 composed of the body 10 and the elastic plate 30 as described above, the fastening pin 100 can be easily and firmly fastened without a separate fastening tool, and it can be separated at the same time, making it easy to use. It is convenient and has a feature that can stably prevent the separation of the natural fastening pin 100 by shock or vibration.

On the other hand, Figures 8 to 9 is another embodiment of the fastening pin 100 according to the present invention, a feature of this embodiment is the fastening pin 100 is once again caught in the inside of the hole 210 of the traction ring 200 By forming a bushing 50 that can auxiliaryly prevent separation, and forming an annular ring 13 that is caught in the inside of the bushing 50 on the body 10 of the fastening pin 100 It is characterized in that 100 can be prevented from being naturally separated by shock or vibration.

That is, as shown, a bushing 50 having an annular groove 51 on the inside is fitted into the hole 210 of the traction ring 200, and an annular ring is inserted into the body 10 of the fastening pin 100. 13) when the fastening pin 100 is inserted into the hole 210 of the traction ring 200, the annular ring 13 of the fastening pin 100 is in the annular groove 51 of the bushing 50 The locking part 12 and the elastic plate 30 from the outside are inserted into the outside of the hole 210, so that the fastening pin 100 is inserted into the annular groove 51 of the bushing 50 from the inside of the hole 210. The annular ring 13 is engaged, and the locking portion 12 and the elastic plate 30 are formed on the outside of the hole 210 and are engaged in the outer side of the hole 210 to separate the fastened state more stably. It can be maintained without this, and when the fastening pin 100 is separated, while the fastening pin 100 is positioned in the same horizontal state as the hole 210, the operator pulls the fastening pin 100 through an annular ring ( 13) is prevented from being separated from the annular groove 51 so that the fastening pin 100 is prevented from being separated by external shock or vibration, so that a stable fastening state can be maintained.

As described above, the fastening pin having a locking structure using an elastic plate according to the present invention has an effect that can be used universally in various industrial machinery devices or construction machines such as excavators, and further, fastening in a state where the fastening pin is fastened. As the elastic plate formed on one side of the pin and the locking part are entirely caught, the fastening pin has the same fatigue level as a whole without being concentrated on one side in the fastened state, so that the fastening pin can stably maintain the fastened state without damage or damage. There is this.

For example, when a fastening pin is used in the form of closing the opening of a traction ring formed on a link or bucket of an excavator, it is formed in a one-touch fitting type rather than a screw fastening type like a fastening pin, so that the coupling and separation of the fastening pins are separately installed. Installation and separation work can be performed quickly and accurately by the operator without tools. In particular, by the elastic plate formed at one end of the fastening pin and having elasticity that expands and contracts, After being contracted and passed through the hole, it is restored and elongated to a diameter larger than the hole, so it can fundamentally prevent the fastening pin from being naturally separated by external shock or vibration due to physical deformation, ensuring a stable fastening state at all times. There is a characteristic that can prevent safety accidents caused by the fall of heavy objects by the possible effects.

As described above, an optimal embodiment has been disclosed in the drawings and specification. Although specific terms have been used herein, these are only used for the purpose of describing the present invention and are not used to limit the meaning or the scope of the present invention described in the claims. Therefore, those of ordinary skill in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the true technical scope of the present invention should be determined by the technical spirit of the appended claims.

10: body 11: female thread
12: locking part 13: annular ring
20: head 30: elastic plate
31: through hole 32: fixing bolt receiving groove
33: V-shaped elastic portion 34: second elastic portion
35: inclined surface 36: bent surface
37: first elastic part 38: incision groove
40: fixing bolt 50: bushing

Claims (5)

A body (10) having a rod shape and having a locking part (12) and a female screw part (11) formed on one side, and a head part (20) composed of a diameter larger than the diameter of the body (10) on one side of the body (10) And, comprising an elastic plate 30 having elasticity that is in close contact with the locking portion 12 and fixed in close contact with the body 10 by a fixing bolt 40 screwed to the female screw portion 11,
The elastic plate 30 has an annular plate shape, a fixing bolt receiving groove 32 having a through hole 31 formed in the center portion, and a V-shaped elastic portion 33 having a "V" cross-section at the edge. A fastening pin having a locking structure using an elastic plate, characterized in that the second elastic portion 34 made of and the first elastic portion 37 made of the inclined surface 35 and the bent surface 36 are integrally formed.
In a fastening pin having a locking structure using an elastic plate formed in a link or bucket of heavy equipment and fastened to a traction ring 200 having a hole 210 for moving a heavy object,
The fastening pin 100 having a locking structure using an elastic plate has a rod shape and a locking portion 12 having a diameter passing through the hole 210 on one side and a female threaded portion 11 at the end thereof. The body 10, the head 20 composed of a diameter larger than the diameter of the body 10 on the other side of the body 10, and in close contact with the locking part 12 and screwed to the female screw part 11 Including an elastic plate 30 that is tightly fixed to the body 10 by the fixing bolt 40 and has elasticity that can be stretched,
The elastic plate 30 has an annular plate shape, a fixing bolt receiving groove 32 having a through hole 31 formed in the center portion, and a V-shaped elastic portion 33 having a "V" cross-section at the edge. The second elastic portion 34 made of and the first elastic portion 37 made of the inclined surface 35 and the bent surface 36 are integrally formed,
An annular ring 13 on one side of the body 10, and a bushing 50 fitted into the inner side of the hole 210 and having an annular groove 51 therein. Fastening pin with structure.
delete delete The method according to claim 1 or 2,
The elastic plate 30 is formed by forming a plurality of cut grooves 38 at regular intervals in the first elastic portion 37 and the second elastic portion 34 to form the first elastic portion 37 and the second elastic portion ( A fastening pin having a locking structure using an elastic plate, characterized in that 34) can be easily expanded and contracted with less pressing force.

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