JPH11141517A - One way fastener - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an one way fastener capable of enhancing workability and working efficiency. SOLUTION: This one way fastener is composed of a cylindrical fastener main body 1 having a flange 2 at its rear end and provided with a pin driving hole 4 diameter-expandable via slits 5, and a pin 3 expanding the tip of the fastener main body 1 by its press-in into the driving hole 4. Two to-be-joined members 9, 10 are sandwiched and fastened by the flange 2 and the expanding portion of the fastener main body 1. The pin driving hole 4 contains a tapered hole portion 4a tapering toward the tip, the pin 3 is provided with a tip tapered portion 7a, the respective taper angles of the tapered hole portion 4a and the tip tapered portion 7a are set to be the same, and the respective lengthwise direction dimensions of the same and the driving dimension of the pin 3 are set to be the same.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-way fastener (hereinafter abbreviated as "fastener") for connecting members to be joined such as thin plates by pin joining.

[0002]

2. Description of the Related Art The present applicant has previously developed a fastener suitable for pin joining between thin plates. This fastener has a flange at the rear end, and a pin main body in which a pin driving hole that can be expanded through three slits is formed on the inside, and is pressed into the pin driving hole from the rear end side of the flange. A pin for expanding the tip of the fastener main body, and press-fitting the pin to clamp and fix the two joined members inserted around the outer periphery of the fastener main body between the flange and the expanded portion of the fastener main body. is there. In such a fastener, the fastener body is inserted into the two members to be joined, the pin is inserted into a pin insertion hole of the fastener body, and the hitting head is hit with a hammer, so that the fastener body is connected to the member to be joined on the back side. With the peripheral edge as a base point, the flared shape widens, and the article is firmly fixed between the widened end and the flange. Therefore, this fastener is suitable for joining thin plates whose back side cannot be confirmed.

[0003]

However, since the fastener main body is made of soft iron or the like and is integrally formed by forging or the like, if the number of slits is three, the fastener is less likely to be plastically deformed and the pin is driven. In this case, a considerable amount of impact force is required, and when fixing is performed while swinging a hammer at a high place, there is a problem that workability is poor and labor is required. In addition, when the pin hits the head, the fastener body may open completely even if the pin does not completely enter the main body, and it is unclear how far it should be driven, so the fastener body really opens It is necessary to confirm whether or not the operation is performed, which causes a reduction in work efficiency.

[0004] Next, in addition to casting at the site, if a fastener is previously fitted to one of the members to be joined at a factory or the like, this one member to be joined can be attached to the other member to be mated at the site. Immediately after alignment, assembly can be performed only by pin driving work. However, simply attaching the fastener to the member to be joined by frictional fitting may cause the fastener to be pulled out during transportation or the like. Therefore, such a pre-assembly is not actually performed. This is the same for assembling the fastener body to the member to be joined and for assembling the pin to the body.

Further, the pin driven into the fastener main body is held by the fastener main body by friction fitting, and in this state, the deformed state of the fastener main body is maintained. There is also concern that the pin may be pulled out of the main body, and once the pin is pulled out, the fixing force between the two articles by the fastener main body decreases.

An object of the present invention is to provide a one-way fastener capable of ensuring good workability at the time of joining and improving work efficiency. Another object of the present invention is to provide a one-way fastener capable of realizing pre-assembly. Still another object of the present invention is to provide
An object of the present invention is to provide a one-way fastener that can reliably prevent a pin once dropped in and a fastening force of a fastener main body from being reduced.

[0007]

The present invention will be described with reference to the drawings. The present invention is formed in a cylindrical shape having a flange 2 at a rear end and a pin driving hole 4 inside, and a four-pointed end. A fastener body 1 having two slits 5 and capable of expanding in diameter, and a pin 3 for expanding the front end of the fastener body by being pressed into the pin driving hole from the rear end side of the flange. A one-way fastener 100 in which the two joined members 9 and 10 having the fastener body inserted therein are clamped and fixed by the flange and the expanded portion of the fastener body in a state where the pin is press-fitted.
In 200 and 300, the tip of the pin driving hole is a tapered hole 4a that tapers toward the tip, and the pin has a tip tapering portion 7a that tapers toward the tip, and It has a pin main body 7 to be fitted, and a hitting head 8 provided at the rear end of the pin main body, and the taper hole of the pin driving hole and the taper end of the pin main body have the same taper angle. In addition, the longitudinal dimension of the tapered hole portion and the tip tapered portion is the same as the driving size of the pin.

In the present invention, since the taper angle of the tapered hole portion of the pin driving hole and that of the tip tapered portion of the pin body are the same, when the pin is inserted into the pin driving hole, the tapered tip portion faces the tapered hole portion. In this state, the pin is securely positioned with respect to the fastener main body, and in this state, the dimension of the portion of the pin main body protruding from the fastener main body is the pin driving dimension. Since the driving dimensions of this pin are the same as the longitudinal dimensions of the tapered hole and the tapered tip,
When the pin is driven into the pin drive hole, the tapered hole is pushed out by the pin body, and when the entire pin body is completely inserted into the pin drive hole, the tip tapered part completely projects from the tapered hole. As a result, the tip of the fastener body can be fully opened.

Therefore, the fastener main body can be completely expanded only by completely inserting the pin into the fastener main body, so that it is not necessary to check the expanded state of the fastener main body, thereby improving work efficiency. Can be planned. In addition, because the number of slits is four, plastic deformation is more likely to occur when the pin is driven than the conventional three, so the fastener can be fixed with a relatively low impact force, and excellent work can be performed. Nature can be secured.

[0010] It is preferable that a wedge-shaped projection (20) whose thickness is increased toward the distal end side of the fastener main body is provided on the outer periphery of the fastener main body. By providing such a protrusion, the protrusion can be made to bite into the prepared hole of the member to be joined, so that the effect of caulking the fastener body to the member to be joined can be obtained.

In this case, since the projection is constituted by the knurl 20 attached to the outer periphery of the fastener main body, the projection can be reliably engaged in the prepared hole of the member to be joined.
An excellent crimping effect is obtained, and it can be easily formed.

In particular, the fastener body is press-fitted into one of the members to be joined in advance by using a press molding machine and held in a fitted state by the projections, so that the fastener body is preliminarily assembled into the member to be joined at a factory or the like. So you can do
The number of work steps on site can be reduced. Further, by using an existing press molding machine, the fastener main body can be easily and reliably press-fitted into the prepared hole of the member to be joined.

In the above, it is desirable that a knurl 30 is attached to the end of the pin body on the side of the hitting head. If such a knurl is provided, when the pin main body is completely driven into the pin driving hole up to the end on the side of the hitting head, in that state, the knurl is bitten irregularly around the pin driving hole and is prevented from falling off. Therefore, the falling off of the pin and the accompanying decrease in the fastening force of the fastener body can be prevented.

In the above, a recess 31 serving as an adhesive reservoir is formed on the outer periphery of the pin body, and the tip of the pin body is inserted into the pin driving hole with the recess filled with the adhesive. Thereby, it is preferable that the pin can be temporarily fixed to the fastener main body.

As described above, by providing a recess on the outer periphery of the pin body and temporarily fixing the pin to the fastener body with the adhesive filled in the recess, the pre-assembly of the pin into the fastener body can be reliably performed.

[0016]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. [First Embodiment] FIGS. 1 to 3 show a first embodiment of the present invention. 1 and 2, a one-way fastener 100 of the present embodiment is formed by press-molding soft iron or the like by forging or the like, and includes a tubular fastener body 1 having a flange 2 at its rear end, and a fastener body 1. And a pin 3 which is press-fitted by a hammer or the like from the flange 2 side.

A pin driving hole 4 is formed in the fastener main body 1 and its rear end is opened to the flange 2 side. The pin driving hole 4 includes a tapered hole 4a that tapers toward the distal end, and an inner cylindrical portion 4b that is linearly continuous with the rear portion of the tapered hole 4a. Further, four slits 5 communicating with the pin driving holes 4 are radially formed at intervals of 90 degrees at the tip of the fastener body 1 so that the diameter can be increased. Slit 5 which becomes the fulcrum of the fastener body 1
Is extended to the vicinity of the flange 2.

The pin 3 includes a solid pin body 7 having a diameter substantially equal to the inner diameter of the pin driving hole 4 and a hitting head 8 integrated with the rear end of the pin body 7. Pin body 7
Is composed of a tapered distal end portion 7a that tapers toward the distal end side, and a cylindrical portion 7b that is linearly continuous with the rear end portion. The taper angle of the tip taper portion 7a is equal to the taper angle of the taper hole portion 4a on the pin driving hole 4 side, and the length L2 is set to be equal to the length dimension of the taper hole portion 4a. For example, by setting both taper angles to 30 °, workability at the time of press-fitting can be improved.

The total length of the pin body 7 is a length obtained by adding the length L2 of the tip tapered portion 7a to the total length L1 of the pin driving hole 4. Accordingly, the striking stroke (strike size) from the state where the pin 3 is inserted into the pin driving hole 4 to the time when the fastener main body 1 is completely expanded is the tapered hole portion 4a of the pin driving hole 4 and the pin main body 7. The length L2 is the same as the longitudinal dimension of each of the tip tapered portions 7a.

Next, a procedure for joining the members 9 and 10 to be joined using the fastener 100 having the above configuration will be described with reference to FIG. First, as shown in FIG. 3A, the fastener main body 1 is inserted from one side of the member 9 to be joined into the pilot holes of the member 9 to be joined and the member 10 to be joined, and the flange 2 is joined. It is positioned by contacting the member 9.

Next, as shown in FIG.
Is inserted into the pin driving hole 4 to bring the tapered end portion 7a into surface contact with the tapered hole portion 4a. Then, the pin 3 is positioned with respect to the fastener main body 1, and in this state, the dimension of the portion of the pin main body 7 protruding from the fastener main body 1 becomes the driving dimension L2 of the pin 3. Then, the pin 3 is pressed into the pin driving hole 4 while hitting the pin 3 using the hammer 11 serving as a driving means. Then, by the hitting operation, the tapered hole portion 4a of the pin driving hole 4 is expanded, and the fastener body 1 is sequentially expanded in the four outer directions while being plastically deformed from the base of the slit 5 as a base point.

The press-fit completed state, that is, FIG.
As shown in the figure, when the entire pin body 7 is completely press-fitted into the pin driving hole 4 and the hitting head 8 is in contact with the flange 2, the tip tapered portion 7 a of the pin 3 is more completely than the front end of the pin driving hole 4. It is in the state pulled out. At this point, the fastener body 1 is completely opened, and the members 9 and 10 located near the base of the slit 5 are firmly held and fixed between the flange 2 and the member. Therefore, the fastener body 1 is fully opened when the impact head 8 comes into contact with the rear end of the flange 2, so that the fixed state, that is, the expanded state of the fastener body 1 is finally confirmed. Can be omitted, so that the working efficiency can be improved.

When the taper angle of the tapered hole 4a and the tapered end 7a is set to 30 °, the distal end of the fastener body 1 expands outward by 30 °, but the taper angle is further increased. If it does, it will spread even larger. However, since the press-in resistance increases as the taper angle increases, the optimum taper angle may be set based on a balance between the press-in resistance and the opening angle.

Further, in this embodiment, since the four slits 5 are formed, the fastener body 1 is easily plastically deformed, and the force required for hitting the pin 3 can be reduced as compared with the conventional case. In addition to the simplicity, the four slits 5 may be formed orthogonally at the time of manufacturing.
It is simpler than the 20 ° interval, and the manufacturing is also simplified.

[Second Embodiment] FIGS. 4 to 6 show a second embodiment of the present invention. In addition, since it is basically the same as that of the first embodiment, the same reference numerals will be given to the same parts and the following description will be made using different reference numerals only for different parts or newly added parts. . The basic configuration of the one-way fastener 200 shown in FIGS.
As in the first embodiment, the tubular fastener body 1 has a flange 2 at the rear end, and the pin 3 is press-fitted from the side of the flange 2 by hitting with a hammer or the like. The same points are provided, and the dimensional relationship of each part of the pin driving hole 4 and the pin 3 is also the same.

In addition to the above, the flange 2 of the fastener body 1
A knurl 20 protrudes from the outer periphery of the side end. The taper angle θ of the knurl 20 is set so that the thickness of the knurl 20 on the tip side is large and becomes thin toward the rear side.

Such a fastener main body 1 is configured to be inserted and held in a prepared hole of one member to be joined in advance. That is, the inner diameter of the prepared hole of one of the members to be joined is
Larger than the outer diameter of the fastener body 1 and the knurl 2
Set the dimension smaller than the outer diameter of 0. Accordingly, the fastener body 1 is press-fitted into the lower hole of the member to be joined by using a driving means such as a hammer, so that the lower hole is plastically deformed by the unevenness of the knurl 20. In the fitting state in which the fastener main body 1 is press-fitted until the flange 2 abuts on the member to be joined, a portion around the prepared hole of the member to be joined comes into engagement with the knurl 20 by springback or the like,
The fastener body 1 is held by one member to be joined. Further, since the knurl 20 has an inverted taper that becomes thicker in the press-fitting direction, the fastener main body 1 is prevented from coming off.
Therefore, after that, it can be positioned and attached to the other member 10 to be joined, while being attached to one member to be joined.

More preferably, the fastener body 1 provided with the knurls 20 is assembled to one of the members 9 before shipment from the factory, as shown in FIG. In this case, one of the members 9 to be joined is
Then, the fastener main body 1 is set, and the punch 21 is lowered to be fitted into the prepared hole of the member 9 to be joined. At this time, the periphery of the prepared hole is pressed by the mandrel 22 facing the lower part of the punch 21, so that the periphery of the prepared hole is caulked, and the periphery of the knurl 20 is fixed by caulking. Thereby, the fastener main body 1 can be transported without being fixed to the member to be joined 9 without fear of falling off.

[0029] In this way, at the construction site,
As shown in FIG. 6 (b), when the fastener main body 1 is positioned in the lower hole of the mating member 10 to be joined,
In this state, the members 9 and 10 can be sandwiched and fixed by simply driving the pin 3 in this state. Therefore, the number of on-site work steps required for joining the members 9 and 10 to be joined can be reduced. In the press-in completed state, as shown in FIG. 6C, the periphery of the lower hole of the member 10 to be joined is sandwiched between the bending position of the fastener main body 1 and the axial end of the knurl 20. In addition, more secure fixing can be performed.

Third Embodiment FIGS. 7 and 8 show a third embodiment of the present invention. In the figure, the configuration of a fastener body 1 and a pin 3 constituting a one-way fastener 300 of the present embodiment is substantially the same as that of the first embodiment.
A knurl 30 is formed at the end of the pin body 7 on the side of the striking head 8, and a shallow groove 31 is formed as a long hole-shaped recess around the insertion portion of the pin body 7 with respect to the pin driving hole 4.
Is different from the others. Then, in the above-mentioned fastener manufacturing final step, after the shallow groove 31 is filled with an adhesive, for example, a cyanoacrylate adhesive, the pin 3 is inserted into the pin driving hole 4 in advance, and shipped in this state. .
As a result, the pin 3 is temporarily fixed to the fastener main body 1 in a retaining state by the curing of the adhesive, and thereafter, the pin 3 is integrally shipped in this package.

As a result, at the construction site, FIG.
As shown in (a), the main body is inserted between the members 9 and 10 to be joined while the pin 3 is mounted on the main body, and the adhesive is peeled off from the bonding surface by an instantaneous impact load due to the impact of the hammer 11 and is driven. Can work. At the final stage of the driving,
As shown in a cross section in part (b), the knurl 30 bites in an uneven shape while plastically deforming around the rear end of the pin driving hole 4, whereby the pin 3 is prevented from coming off. Therefore, in the present embodiment, since the pin 3 can be handled while being assembled to the fastener main body 1, and since the pin 3 is driven in, it is structurally prevented from coming off. There is an advantage that it is possible to prevent disconnection and a decrease in the fastening force due to this.

In the third embodiment, the outer peripheral knurl of the fastener main body 1 is omitted, but it goes without saying that it can be added. Further, the pin body of the one-way fastener 200 of the second embodiment may also be formed with a shallow groove serving as an adhesive pool or a knurl for retaining.
Further, in the second embodiment, the protrusions for preventing the fastener body from coming off are formed by the knurls. However, the protrusions are not limited to the knurls. For example, a plurality of protrusions along the longitudinal direction are provided on the outer periphery of the fastener body. Articles may be provided.

[0033]

As is apparent from the above description, the one-way fastener according to the present invention has the following various effects. Strictly defining the dimensional relationship between the pin and the pin insertion hole enables a reliable fastening operation, and thereby eliminates the need for a checking operation, thereby improving workability. By using four slits, it is easy to plastically deform when the pin is driven in, and the operation is further simplified, and the slit is easily indexed and the production is simple. The projection provided on the outer periphery of the fastener main body is engaged with the member to be joined, so that the fastener main body can be fixed to the member to be joined, thereby enabling pre-assembly before shipment from the factory. By providing knurls on the outer periphery of the pin, it is possible to prevent the pin from coming off and the accompanying decrease in the fastening force. By providing the means for temporarily fixing the pin to the fastener main body, the pin can be handled in an integrated state, and problems such as loss of parts can be avoided.

[Brief description of the drawings]

FIG. 1 is a front view and a side view showing a one-way fastener according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a one-way fastener of the first embodiment.

FIG. 3 is an explanatory view showing a joining procedure using the one-way fastener of the first embodiment.

FIG. 4 is a front view and a side view showing a one-way fastener according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing a fastener body of the second embodiment.

FIG. 6 is an explanatory view showing a joining procedure using the one-way fastener of the second embodiment.

FIG. 7 is a side view showing a one-way fastener according to a third embodiment of the present invention.

FIG. 8 is an explanatory view showing a joining procedure using the one-way fastener of the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fastener main body 2 Flange 3 Pin 4 Pin driving hole 4a Taper hole 4b Inner cylinder part 5 Slit 7 Pin main body 7a Tip taper part 7b Cylindrical part 8 Strike head 9,10 Joined member 20 Knurling (protrusion) 30 Knurling 31 Shallow groove (dent) 100, 200, 300 One-way fastener

Claims (6)

[Claims] 1. A fastener body having a rear end provided with a flange and having a pin driving hole therein and formed in a cylindrical shape and having four slits at a front end thereof, the diameter of which can be increased, and the flange. A pin for expanding the front end of the fastener main body by being pressed into the inside of the pin driving hole from the rear end side. In the press-fit state of the pin, the two joined members that have passed through the fastener main body are joined together. In a one-way fastener configured to be pinched and fixed by the flange and an expanded portion of the fastener body, the tip of the pin driving hole is a tapered hole tapering toward the tip, and the pin is A pin body having a tapered tip portion tapered toward the pin fitting hole and a hitting head provided at a rear end of the pin body; A one-way fastener in which the taper angle of the tapered hole portion and the tip taper portion of the pin body is equal to the taper angle of each of the tapered hole portion and the tip tapered portion of the pin body; . 2. The one-way fastener according to claim 1, wherein a wedge-shaped protrusion having a thickness increasing toward a tip end side of the fastener main body is provided on an outer periphery of the fastener main body. One-way fastener to do. 3. The one-way fastener according to claim 2, wherein the projection is formed by a knurl attached to an outer periphery of the fastener body. 4. The one-way fastener according to claim 2, wherein the fastener body is press-fitted to one of the members to be joined in advance by using a press forming machine, and the fastener body is brought into a fitted state by the protrusion. One-way fastener characterized by holding. 5. The one-way fastener according to claim 1, wherein a knurl is attached to an end of the pin body on the side of the hitting head. Fasteners. 6. The one-way fastener according to claim 1, wherein a recess serving as an adhesive reservoir is formed on an outer periphery of the pin main body, and the recess is filled with an adhesive. The one-way fastener according to claim 1, wherein the pin is temporarily fixed to the fastener body by inserting a tip of the pin body into the pin driving hole.