JP2000234604A - Fastening tool of piled two sheets of corrugated cardboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening tool to constantly maintain a piled condition of two sheets of corrugated cardboard that are required to be used in a piled condition. SOLUTION: This fastening tool has a female fastening fitting 1 provided with an insertion projection part 10 inserted in a fixing hole H from one side of the two sheets of corrugated cardboards P, P and a press down plate part 11, and a male fastening fitting 2 provided with a bolt part 20 inserted in the fixing hole H from the other side of the corrugated cardboards P, P and a press-down plate part 29. A female thread hole 11a that the bolt part 20 of the male joint fixture 2 is screwed in is formed in the insertion projection part 10 of the female fastening fitting 1. The two sheets of corrugated cardboard P, P are brought into close contact with each other in a piled condition by the bolt part 20 screwed into the female thread hole 11a in the fixing hole H. Moreover, the bolt part 20 is provided with a washer like body 27 provided with rubber like elasticity fit in a fitting hole elastically expanded and a compression coil spring 28 put between the washer like body 27 and the press-down plate part 29 of the male fastening fitting 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to two cardboards which are required to be used in a superposed state and fastened by sandwiching the two cardboards so as to maintain the superposed state. The provision of fasteners.

[0002]

2. Description of the Related Art For corrugated products which need to be firmly formed, such as cardboard boxes for transportation, it is often required to use two independent cardboards in a superposed state.

[0003] However, it is difficult to properly bond two independent cardboards together with an adhesive in a superposed state.

[0004] For this reason, conventionally, a method of maintaining a superposed state of two corrugated boards by using a fastener having a structure shown in FIGS. 13 and 14 has been adopted.

[0005] Such a conventional fastener comprises a male fastener 100 having a bolt portion 101 and an insertion projection 201 having a female screw hole 201a into which the bolt portion 101 is screwed.
And a female fastener 200 having
Reference numeral 0 denotes the bolt portion 101 on one side of the clamping plate portion 102.
And the female fastener 200 also has the insertion protrusion 201 on one surface side of the sandwiching plate portion 202 in a protrusion shape. Then, with respect to the mounting hole H provided in the two corrugated cardboards P and P in a communicating state,
The insertion protrusion 201 of the female fastener 200 is inserted from one side of the mounting hole H, and the bolt portion 101 of the male fastener 100 is inserted from the other side of the mounting hole H to rotate the male fastener 100. Operate the bolt part 1
01 is screwed into the female screw hole 201a to hold the two cardboards P, P with the sandwiching plate portions of both fasteners 100, 200 to maintain the overlapping state.

[0006]

However, in a product constituted by two cardboards P, P sandwiched in a superposed state by such fasteners, impacts, vibrations and the like are frequently applied. In spite of such shocks and vibrations, if a method that can more stably secure the screwed state of the bolt portion 101 in the female screw hole 201a at the appropriate position can be provided, Further improvement in the utility value of the fastener can be provided.

In the conventional fastener, the insertion projection 20 of the female fastener 200 in the mounting hole H is provided.
1 when the bolt 101 of the male fastener 100 is screwed into the female fastener 1, the bolt 101 presses the insertion projection 201 of the female fastener 200 and the insertion projection 201 of the female fastener 200 from within the mounting hole H. And the two fasteners 100 and 200 by the screwing operation.
In order not to cause difficulty in the fastening work of the female fastener 200, a washer 300 is attached to the protruding end of the insertion protrusion 201 of the female fastener 200 inserted into the mounting hole H provided in the one corrugated cardboard P from the mounting hole H. In some cases, it is necessary to reduce the labor for fitting the washer 300.

Accordingly, the present invention provides a method for maintaining a superposed state of two corrugated cardboards which are required to be used in a superimposed state with the two corrugated paperboards interposed therebetween. In a fastener consisting of a male fastener and a female fastener that is fastened in a mounting hole provided in communication with the fastener, the fastening state can be more stably maintained, and
The main purpose is to make this fastening operation easier.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, a fastener for two corrugated cardboards has the following structures (1) to (4). It was taken. (1) An insertion projection inserted into the mounting hole from one side of two cardboards provided with an installation hole communicating with each other in a superimposed state, and a sandwiching plate having the insertion projection on one surface side. A female fastener provided, (2) a bolt portion inserted into the mounting hole from the other side of the two cardboards provided with the mounting hole in communication with each other, and a sandwiching plate portion having the bolt portion on one surface side. And (3) a female screw hole into which the bolt portion of the male fastener is screwed from the distal end side of the insertion protrusion at the insertion protrusion of the female fastener. And (4) fitting the two cardboards together in a superposed state by screwing the bolts into the female screw holes in the mounting holes, and (4) fitting the bolts in the male fasteners. Attached The elastic member is provided with rubber-like elasticity in which the bolt portion is passed through the fitting hole and elastically fitted to the bolt portion in a state where it is elastically expanded, and has a size capable of abutting against a hole edge surface of the mounting hole. A washer-like body and a compression coil spring interposed between the washer-like body and the sandwiching plate portion of the male fastener with the bolt portion housed inside.

According to this configuration, first, the insertion projection of the female fastener is inserted into the mounting hole provided on one side of the two cardboards provided with the mounting holes communicating with each other in a superposed state. It can be inserted to a position where the sandwiching plate portion of the fastener contacts the plate surface of the one side corrugated cardboard.

Then, the bolt portion of the male fastener is pressed against the mounting hole from the other side of the two cardboards, and the washer-like body is pressed against the plate surface of the corrugated cardboard that goes around the mounting hole, thereby forming the compression coil spring. Can be inserted while shrinking in the compression direction, and the tip of the bolt can be inserted into the female screw hole of the insertion projection of the female fastener.

The bolt portion of the male fastener is urged in the direction of coming out of the mounting hole by the compressed coil spring contracted in this way, so that the tip of the bolt portion is slightly attached to the female screw hole. When the bolt portion and the female screw hole are screwed in by the rotation operation of the bolt portion side, the female fastener is pulled in such a direction as to bring the pinching plate portion into close contact with the board surface of the corrugated cardboard by such biasing. However, the female fastener is not moved in a direction to cause the insertion protrusion to come out of the mounting hole of the corrugated cardboard, even if no special consideration is given to the operation of screwing the bolt portion into the female screw hole.

The compression coil spring is further compressed in the compression direction by further rotating the male fastener in which the bolt portion is introduced into the female screw hole provided in the insertion protrusion of the female fastener. While
The bolt portion can be screwed into the female screw hole until the pinching plate portion of the male fastener contacts the plate surface of the cardboard on the other side.

Then, by the screwing, the two cardboards are sandwiched between the sandwiching plate portion of the male fastener and the sandwiching plate portion of the female fastener, and brought into close contact with each other in a superposed state. In addition, it is possible to create a fastening state while maintaining the close contact state.

In this fastening state, a force is applied to the male fastener by the compression coil spring so as to always pull out the bolt portion from the female screw hole of the insertion projection of the female fastener. As a result, in such a fastened state, the thread of the bolt portion and the thread of the female screw hole are in close contact with each other on the side face, and loosening of the threaded state of both is effectively prevented.

Further, the washer-like body having rubber-like elasticity is strongly pressed against the board surface of the corrugated cardboard under the urging force of the compression coil spring, so that the male fastener can rotate the bolt portion. When a force is applied, the male fastener is rotated in such a direction as to unexpectedly release the fastening state in the fastening state in order to generate a frictional force against the force with the plate surface of the corrugated cardboard. Can be effectively prevented.

According to the second aspect of the present invention, the insertion projection of the female fastener is provided at the edge of the pinching portion of the male fastener in the two cardboard fasteners according to the first aspect. The direction in which the bolt portion of the male fastener is screwed into the female screw hole of the cardboard and is pressed against the board surface of the cardboard to pull out from the female screw hole of the insertion protrusion of the female fastener with respect to the bolt portion of the male fastener. Abutting projections for applying the above force are formed.

According to this configuration, in the fastening state, the abutting projection is also directed to the male fastener so that the bolt is always pulled out from the female screw hole of the insertion projection of the female fastener. Is assumed to act.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One of the typical embodiments of the present invention will be described below with reference to FIGS.

Here, FIGS. 1 and 2 show the components constituting the fastener according to this embodiment in a perspective view separately, and FIG. 2 is viewed from the opposite direction to FIG. Each of these components is shown. FIG. 3 shows the male fastener 2 constituting such a fastener as viewed from its upper surface 2 ″, and FIG. 4 shows the male fastener 2 as viewed from its lower surface 2 ′. , Respectively.
FIG. 5 shows the male fastener 2 as seen from the side, and FIG. 6 shows a longitudinal section.

FIG. 7 is an enlarged view of the abutting protruding portion 26 formed on the peripheral portion of the clamping plate portion 29 of the male fastener 2 so that the configuration of the abutting protruding portion 26 can be easily understood. FIG. 8 is a cross-sectional view, and FIG. 8 shows how the washer-like body 27 is fitted to the bolt portion 20 of the male fastener 2 so that the state of fitting the washer-like body 27 can be easily understood. The part is enlarged and shown as a cross section.

FIG. 9 shows a mounting hole H provided in one cardboard P which is fastened in a superposed state, a bolt portion 20 of the male fastener 2 and a mounting hole provided in the other cardboard P. H shows a state in which the insertion projections 10 of the female fastener 1 are inserted into the H, respectively, as a state of a longitudinal section, and FIG. 10 shows two corrugated boards P, P
, The two fasteners inserted into the respective mounting holes H are fastened, and the two cardboards P, P are sandwiched between the sandwiching plate portion 29 of the male fastener 2 and the sandwiching plate portion 11 of the female fastener 1. The attached state is shown as a state of a longitudinal section. FIG. 11 shows the washer-like body 27 in the state of FIG.
FIG. 12 shows the state of pressing the cardboard P against the surface.
Are the thread 20a of the bolt portion 20 of the male fastener 2 and the thread 1 of the female screw hole 11a of the female fastener 1 in the state of FIG.
The contact state with 1b is shown enlarged for easy understanding.

In the fastener according to this embodiment, two independent cardboards P, P are overlapped with each other so that the opposing surfaces of the two cardboards P, P are brought into close contact with each other.
It is used to bind P.

The above-mentioned fastening of the two cardboards P, P is typically required from the viewpoint of firmly forming a cardboard P box for transporting various articles, which contains various articles.

Further, as the two cardboards P, P thus bonded, typically, a double-sided cardboard (so-called two-layer cardboard) or a double-sided cardboard (so-called three-layer cardboard) is used.

The fastener according to this embodiment is arranged such that a mounting hole H formed in the two corrugated boards P, P communicated in the superposed state is attached to the two corrugated boards P, P.
A female fastener 1 having an insertion protrusion 10 inserted into the mounting hole H from one side of the two cardboards P;
And a male fastener 2 having a bolt portion 20 inserted into the mounting hole H from the other side of P.

First, the female fastener 1 is provided with a cylindrical insertion protruding portion 10 on one surface side of a substantially circular holding plate portion 11 and in the center of the holding plate portion 11 in a protruding manner. ing. In this embodiment, both the pinching plate portion 11 and the insertion projection 10 are made of metal, and one end of the insertion projection 10 is welded to the pinching plate portion 11 to be used. The insertion projection 10 is integrally attached to the sandwiching plate 11. The insertion protrusion 10 is provided with a female screw hole 11a opened at the tip end thereof along the projecting direction of the insertion protrusion 10, and the female screw hole 11a is provided with a bolt of the male fastener 2 in the female screw hole 11a. The portion 20 is configured to be screwed in from the open side of the distal end with the rotation operation of the male fastener 2. Further, in this embodiment, the annular projection 1 is formed so as to go around the outside of the insertion projection 10 on the surface of the sandwiching plate 11 on the side where the insertion projection 10 is provided.
2 are formed, and the welding is performed inside the annular protrusion 12.

In addition, at the outer edge of the sandwiching plate portion 11, the piercing claws 1 projecting in the same direction as the projecting direction of the insertion projecting portion 10 at four places at substantially equal intervals.
3 are formed. The piercing claw 13 has a sharp point so as to pierce the cardboard P. In this embodiment, the piercing claw 13 is provided with circular through holes 14 at the four positions of the sandwiching plate portion 11,
The outer edge of the sandwiching plate 11 and the through hole 14 are cut, and the cut edge 15 and the through hole 14 are formed into a tongue-shaped portion having a sharpened point, and the base portion thereof is removed. It is formed by bending upright on the side. The piercing claw 13 pierces the cardboard P when the insertion protrusion 10 of the female fastener 1 is inserted into the mounting hole H of the cardboard P to a position where the plate surface of the pinching plate 11 contacts. In addition, while the female fastener 1 is screwed into the female threaded hole 11a of the insertion portion of the female fastener 1 when the male fastener 2 is screwed into the female threaded hole 11a, the female fastener 1 is prevented from rotating together, At the same time, it functions to prevent the female fastener 1 from falling off from the cardboard P. In addition, from the viewpoint of sufficiently securing the falling-off preventing function, the piercing claw 13 is bent and erected so as to be slightly inclined laterally with respect to a vertical line with respect to the plate surface of the sandwiching plate portion 11. In some cases, they are made to do so.

Next, the male fastener 2 is located on one surface side of a disk-shaped sandwiching plate portion 29 and substantially in the center thereof.
The bolt portion 20 is provided in a protruding manner. (Less than,
The projecting side of the bolt portion 20 is referred to as the lower surface side 2 'of the male fastener 2 and the side opposite to the projecting side of the bolt portion 20 is referred to as the upper surface side 2 "of the male fastener 2.) In the male fastener 2, a fixing hole 21 that narrows like a slash from the upper surface side 2 ″ to the lower surface side 2 ′ of the male fastener 2 is formed in a substantially central portion of the clamping plate portion 29 in the male fastener 2. The bolt 22 is formed by shaping the fixing hole 21 so that the side of the head 22a faces the shaft portion 22b from the upper surface side 2 "and the head 22a is gradually tapered. The bolt portion 20 is integrated with the pinching plate portion 29 of the male fastener 2 by caulking the fixing hole 21 in a state where the head 22a is positioned in the fixing hole 21 by being inserted from the side of the portion 22b. As a result, this implementation In the, take the male fastener 2
A projecting portion 23 projecting from the lower surface side 2 ′ of the male fastener 2 is formed in a portion around the projecting base of the bolt portion 20 in the sandwiching plate portion 29. Further, in this embodiment, the lower surface side 2 ′ of the male fastener 2 is provided.
In the above, an annular concave portion 24 is formed on the outside of the pinching plate portion 29 around the projecting portion 23, and a flat portion 25 is formed between the outer edge of the annular concave portion 24 and the edge portion of the pinching plate portion 29. It is. A cross-shaped hole 22c into which the tip of a driver is inserted is formed on the upper surface of the head 22a of the bolt 22, and the cross-shaped hole 22c is located on the upper surface side 2 ″ of the male fastener 2. The rotation operation of the male fastener 2 can be performed by utilizing 22c.

In this embodiment, the pinching plate 29 is located on the lower surface 2 'of the male fastener 2.
Is formed at the edge of the cardboard P. The bolt 20 is inserted into the mounting hole H of the cardboard P, and the bolt 20 is connected to the female fastener 1. The protruding end of the abutting projection 26 is pressed against the board surface of the cardboard P in a state where it is screwed into the female screw hole 11a of the insertion projection 10 and tightened to a predetermined position. In this embodiment, the abutting protrusion 26 is formed in a state where the holding plate portion 29 of the male fastener 2 is formed in a cross section along the direction in which the bolt portion 20 projects. 26 is gradually inclined outwardly from the pinching plate portion 29 toward the protruding end 26 (FIG. 7). The corrugated cardboard is tightened by tightening the male fastener 2 to the predetermined position. When pressed against the plate surface of P, a slight elastic deformation occurs and the bolt portion 20 of the male fastener 2 screwed into the female screw hole 11a of the insertion protrusion 10 of the female fastener 1 The force acts in the direction of pulling out from the female screw hole 11a.

Further, a washer-like body 27 having rubber-like elasticity such as rubber is fitted to the bolt portion 20 of the male fastener 2. In this embodiment, the washer-like body 27
It is formed in a disk shape with a fitting hole 27a having a diameter slightly smaller than the outer diameter of 0 (diameter between the tips of the screw threads 20a) at the center. Further, the washer-like body 27 is configured so that its outer diameter is larger than the hole diameter of the mounting hole H of the cardboard P.

Further, the bolt portion 20 of the male fastener 2 is accommodated inside the bolt portion 20 between the washer-like body 27 and the lower surface side 2 ′ of the sandwiching plate portion 29. In this state, a compression coil spring 28 is interposed. In the present embodiment, the compression coil spring 28 accommodates the protrusion 23 formed on the holding plate portion 29 of the male fastener 2 from one end side to the inside, and connects the one end side to the protrusion portion. The diameter of the protrusion 23 is formed so as to be located substantially along the outer edge of the projection 23 formed between the annular recess 23 and the annular recess 24. The interposed state of the compression coil spring 28 is maintained by the washer-like body 27, and the male fastener 2 is prevented from dropping off the bolt portion 20 before being fastened to the female fastener 1.

Since the fastener according to this embodiment has the above-described configuration, first, two fasteners of the two cardboards P, P provided with the mounting holes H which are communicated in an overlapped state are provided. The insertion projection 10 of the female fastener 1 can be inserted into the mounting hole H on one side until the pinching plate 11 of the female fastener 1 comes into contact with the plate surface of the cardboard P on the one side. (FIG. 9)

In this embodiment, the insertion protrusion 10 of the female fastener 1 passes through the mounting hole H of one of the cardboards P on the insertion side of the female fastener 1 and the other cardboard P Is inserted into the mounting hole H of the other cardboard P together with the insertion protrusion 10 of the female fastener 1. The communication state of the mounting holes H of P and P can be ensured.

Next, the bolt portion 20 of the male fastener 2 is inserted into the mounting hole H on the other side of the two cardboards P, P, and the washer-like body 27 is inserted into the plate surface of the cardboard P that goes around the mounting hole H. To compress the compression coil spring 28 in the compression direction and insert the compression coil spring 28 so that the tip of the bolt portion 20 can be inserted into the female screw hole 11 a of the insertion projection 10 of the female fastener 1.

The compression coil spring 28 compressed in this way urges the bolt portion 20 of the male fastener 2 in a direction to come out of the mounting hole H, so that the tip of the bolt portion 20 becomes the female end. Even if the female fastener 1 is slightly inserted into the screw hole 11a and the bolt part 20 and the female screw hole 11a are screwed by a rotation operation on the bolt part 20 side, the female fastener 1 causes the pinching plate part 11 to be corrugated cardboard P The bolts 20 are pulled in such a direction as to bring them into close contact with the plate surface, and the female fastener 1 can be screwed into the female screw hole 11a without any special consideration.
Is not moved in a direction that causes the insertion protrusion 10 to come out of the mounting hole H of the cardboard P.

Further, by further rotating the male fastener 2 in which the bolt portion 20 is introduced into the female screw hole 11a provided in the insertion protrusion 10 of the female fastener 1, the compression coil spring 28 is disengaged. While further compressing in the compression direction, the bolt portion 20 is screwed down to a position where the abutting projection 26 of the pinching plate portion 29 of the male fastener 2 contacts the plate surface of the cardboard P on the other side. It can be screwed into the hole 11a. (Figure 1
0) Then, by the screwing, the two cardboards P, P were sandwiched between the sandwiching plate portion 29 of the male fastener 2 and the sandwiching plate portion 11 of the female fastener 1 and were overlapped. In this state, it is possible to create a fastening state in which the members are brought into close contact with each other, and the close contact state is maintained.

In this fastening state, the male fastener 2
A force is applied by the compression coil spring 28 in a direction to constantly pull out the bolt portion 20 from the female screw hole 11a of the insertion protrusion 10 of the female fastener 1. As a result, as shown in FIG. 12, the thread 20a of the bolt portion 20 and the female screw hole 11
The side surface of the screw thread 11b is tightly attached to the screw thread 11b, and loosening of the screwed state of the both is effectively prevented.

Further, in this embodiment, in this fastening state, the abutting projection 26 is
Is slightly elastically deformed by being pressed against the plate surface of the female fastener 1 so that the bolt portion 20 is always pulled out from the female screw hole 11a of the insertion projection 10 of the female fastener 1 with respect to the male fastener 2. Is applied.

Further, the washer-like body 27 having the rubber-like elasticity is strongly pressed against the plate surface of the corrugated cardboard P under the urging force of the compression coil spring 28, and the bolt 20 When a force in the direction of rotating is applied, a frictional force against this force is generated between the cardboard P and the plate surface. The situation where the male fastener 2 is rotated can be effectively prevented. (FIG. 11)

As a result, according to the fastener according to this embodiment, the superposed state of the two cardboards P can be stably maintained. Typically, when such two cardboards P, P are superposed to form a cardboard P box for transporting various articles, the impact or vibration applied to the cardboard P box during the transportation process or the like causes the aforementioned The fastening condition between the male fastener 2 and the female fastener 1 can be prevented from being unexpectedly damaged.

Further, even if the two corrugated boards P, which are kept superimposed by such fasteners, deteriorate with time and their thickness is reduced, the action of the compression coil spring 28 causes such corrugated boards. There is no gap between the opposing surfaces of the cardboards P, P.

The length of the bolt portion 20 of the male fastener 2 and the length of the insertion protrusion 10 of the female fastener 1 are appropriately changed according to the thickness of the two cardboards P to be superposed. Things. In addition, the dimension between the protruding end of the butting protruding portion 26 of the male fastener 2 and the inner surface of the sandwiching plate portion 29 is appropriately changed according to the length of the compression coil spring 28 to be used. .

[0044]

According to the fastener for two corrugated boards according to the present invention, the state of superposition of two corrugated boards required to be used in a superposed state is determined by putting the two corrugated boards between the two corrugated boards. It is possible to stably secure the male fastener and the female fastener which are fastened in the mounting holes provided in communication with the two cardboards in a state of being sandwiched therebetween. Further, this fastening operation can be performed more easily.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a fastener.

FIG. 2 is an exploded perspective view of a fastener.

FIG. 3 is a plan view of the male fastener 2;

FIG. 4 is a bottom view of the male fastener 2;

FIG. 5 is a side view of the male fastener 2;

FIG. 6 is a sectional view of the male fastener 2;

FIG. 7 is a sectional view of a main part of the male fastener 2;

FIG. 8 is a sectional view of a main part of the male fastener 2.

FIG. 9 is a sectional view showing a state of use (before fastening).

FIG. 10 is a sectional view showing a use state (after fastening).

FIG. 11 is a sectional view of a main part showing a use state.

FIG. 12 is a sectional view of a main part showing a use state.

FIG. 13 is a perspective view showing a conventional example.

FIG. 14 is a sectional view showing a use state of a conventional example.

[Explanation of symbols]

 P Corrugated cardboard H Mounting hole 1 Female fastener 10 Inserting projection 11 Clamping plate portion 11a Female screw hole 2 Male fastener 20 Bolt portion 29 Clamping plate portion 27 Washer-like body 27a Fitting hole 28 Compression coil spring

Claims (2)

[Claims] 1. An insertion protrusion inserted into one of two cardboards provided with mounting holes communicating with each other in a superposed state from one side thereof, and a sandwiching plate portion having the insertion protrusion on one surface side. And a bolt portion inserted into the mounting hole from the other side of the two cardboards provided with the mounting hole in communication with each other, and a clamping plate portion having the bolt portion on one surface side. A female screw hole into which a bolt portion of the male fastener is screwed from a distal end side of the insertion protrusion. And the two cardboards are brought into close contact with each other by screwing the bolt portion into the female screw hole in the above, and a fitting hole is elastically fitted in the bolt portion of the male fastener. A washer-like body having a rubber-like elasticity to be fitted into the bolt portion by passing the bolt portion through the fitting hole in a state of being spread out, and having a size to be abutted against a hole edge surface of the mounting hole. And a compression coil spring interposed between the washer-like body and the sandwiching plate portion of the male fastener with the bolt portion housed inside. Two cardboard fasteners. 2. Pressing against the edge of the pinching plate portion of the male fastener against the board surface of the corrugated cardboard as the bolt portion of the male fastener is screwed into the female screw hole of the insertion projection of the female fastener. 2. A striking projection for applying a force in a direction of pulling out from the female screw hole of the insertion projection of the female fastener to the bolt portion of the male fastener. Two cardboard fasteners.