KR20220170002A - blind rivet - Google Patents

Abstract

The present invention relates to a blind rivet, which is inserted into a mounting hole formed in a basic material to be fastened and fixed by clamping to improve fastening precision and corrosion resistance. The blind rivet includes: a rivet body unit which includes a head unit formed to be extended to have a cross-sectional area exceeding a diameter of the mounting hole to come in contact with a rim surface of one side of the mounting hole and an extension unit which is extended from the head unit to penetrate the mounting hole and through which a hollow penetrating through the head unit and the extension unit at the same time and formed with a screw groove unit on an inner circumferential surface of the hollow along a pre-set longitudinal area penetrates in a longitudinal direction; and a pressurization core unit which is inserted into the hollow, has a binding end provided at another end thereof to be fastened and bound to an another-end side of the extension unit, has a screw groove unit formed along an outer circumferential surface thereof and engaged and rotated with the screw groove unit through a rotation tool to provide a rotation pressurization force for allowing the another-end side of the extension unit to be pressurized, extended, and deformed between the mounting hole and the binding end, and has a fastening end formed on one end thereof to allow an end of the rotation tool to be coupled.

Description

blind rivet {blind rivet}

The present invention relates to a blind rivet, and more particularly, to a blind rivet with improved fastening precision and corrosion resistance.

In general, blind rivets are used in a variety of applications, including fastening thin plates to relatively thick components, and are used in a variety of materials from steel to plastic.

These blind rivets allow a low-cost assembly to be performed, and also contribute to the strength and integrity of the final joint or fastening. For example, if a pair of work plates to be joined are slightly bent, the rivets are needed to clamp the work plates together.

In addition, blind rivets are generally required to have high shear strength, and the rivet body and the rivet are formed on the work plate so that the work plate is not vibrated by the applied load or worn by the applied vibration. It is required to extend to any spacing between holes. This is particularly important in the vehicle industry.

In addition, it is generally required that the rivets, when installed, have a single roll-type bulged installation on the blind side of the workpiece, provide enhanced tensile resistance to applied loads, and provide an aesthetic appearance. do.

1A and 1B are cross-sectional views showing a conventional blind rivet.

1A to 1B, a conventional blind rivet 1 includes a rivet having a body portion 3 extending from an inner end of a head portion 2, and a rivet body inserted into a base material M to be fastened. It may be composed of a stem portion 4 provided to deform the end of the portion 3 so that the rivet is fastened to the parent material M to be fastened.

At this time, in the conventional blind rivet 1, the stem portion 4 is inserted into a hollow formed in the center of the body portion 3, and its end is caught on the end edge of the body portion 3. In addition, when the stem part 4 protruding and extending outward from the head part 2 is fixed to a tool and then pulled with a predetermined force, the end of the body part 3 is deformed to the base material M to be fastened. It is caught and fastened to the formed hole rim. At this time, the stem portion 4 protruding and extending outward from the head portion 2 is cut.

However, in the case of the conventional blind rivet 1, the deformed shape 3a of the end of the body portion 3 of the rivet according to the force pulling the stem portion 4 is formed differently, resulting in a deviation in fastening force for each rivet. As a result, there is a problem in that the overall fastening force is lowered.

In addition, when the stem portion 4 is cut, the fractured surface 4a is exposed to the outside, and as the fractured surface 4a is corroded, the corrosion resistance of the rivet deteriorates. In addition, a groove is formed on the outer circumference of the stem portion 4 to facilitate cutting of the stem portion 4. Due to the strong force pulling the stem portion 4, the stem portion 4 ) was cut, there was a problem that the rivet could not be fastened properly.

In addition, since the remaining portion of the stem portion 4 is discarded, there is a problem in that economic feasibility is lowered due to material waste.

Korean Patent Publication No. 10-1995-0033134

In order to solve the above problems, an object of the present invention is to provide a blind rivet with improved fastening precision and corrosion resistance.

In order to solve the above problems, the present invention is a blind rivet inserted into a mounting hole formed in a parent material to be fastened and fixed by clamping, and a head extended with a cross-sectional area exceeding the diameter of the mounting hole so as to contact one edge surface of the mounting hole. and an extension portion extending from the head portion to pass through the mounting hole, the rivet penetrating the head portion and the extension portion at the same time, and having a hollow threaded groove formed along a predetermined length area on an inner circumferential surface through the longitudinal direction. body part; and a restraining end inserted into the hollow, fastened and constrained to the other end of the extension, provided at the other end, and the other end of the extension is pressed between the mounting hole and the restraint to provide rotational pressure for expansion and deformation. Provided is a blind rivet including a pressurizing core portion formed along an outer circumferential surface of a screw groove portion engaged with the screw groove portion and rotated through a rotating means, and having a coupling end to which an end portion of the rotating means is coupled to one end.

On the other hand, in the present invention, in a blind rivet inserted into a mounting hole formed in a base material to be fastened and fixed by clamping, a head portion extending in a cross-sectional area exceeding the diameter of the mounting hole so as to come into contact with an edge surface on one side of the mounting hole, and the mounting hole An extension portion extending from the head portion to pass through and having a variable end protruding to the other side of the mounting hole, wherein the head portion and the extension portion are simultaneously penetrated, but a hollow in which threaded grooves are continuously formed on the inner circumferential surface is penetrated in the longitudinal direction. rivet body; and extending to a length greater than the length of the variable end but less than the length of the rivet body portion and inserted into the hollow, disposed outside the extension portion, and having a cross-sectional area such that an edge of one side is caught on the other end of the extension portion, and is inserted into the hollow portion. A rotation means is provided at the other end so that the variable end is pressed between the other end of the mounting hole and the restraint end to provide a rotational pressing force for expansion and deformation. Provided is a blind rivet including a pressurizing core portion in which a screw groove portion engaged with and rotated through the screw groove portion is formed along an outer circumferential surface in one direction, and a coupling end into which an end portion of the rotating means is inserted and coupled is formed at one end.

In addition, in the present invention, in a blind rivet inserted into a mounting hole formed in a base material to be fastened and fixed by clamping, the cross-sectional area exceeding the diameter of the mounting hole is formed so as to contact the edge surface of one side of the mounting hole, but the locking groove is formed at one end. An extension portion having a recessed head portion and a variable end extending from the head portion to pass through the mounting hole and protruding to the other side of the mounting hole, the extension portion passing through the head portion and the extension portion simultaneously and corresponding to the variable end A rivet body through which a hollow threaded groove is formed on the inner circumference of the narrow portion protruding radially inward on the inner circumference in the longitudinal direction; and formed to have an outer diameter less than the inner diameter of the hollow, extend longer than the length of the extension part, and be inserted into the hollow, and a restraining end fastened to the variable end side is provided at the other end, and the variable end connects to the other end of the mounting hole. A screw groove portion engaged with the screw groove portion and rotated through a rotating means is formed in one direction along the outer circumferential surface to provide rotational pressure for being pressed between the restraining ends and deformed, and an end portion of the rotating means is inserted and coupled to one end. Provided is a blind rivet including a pressing core part formed in a shape to be accommodated in the locking groove part.

Through the above solution, the present invention provides the following effects.

First, as the pressure core is screwed into the inner circumference of the rivet body and rotated and transferred upward at uniform pitch intervals through the rotational force of the rotating means, a constant compressive force is applied to the variable end and transformed into a uniform thickness and shape, thereby increasing the fastening force for each rivet Since they are formed substantially the same, fastening properties can be remarkably improved.

Second, as one end of the pressing core part having the coupling groove is formed to be located inside the hollow even after the compressive deformation of the variable part, the protruding structure to the outside of the head part is substantially removed after fixing the rivet to the parent material to be fastened, so that cutting, etc. Since the post-processing process is omitted and the problem of corrosion of the cut surface is fundamentally prevented, work convenience and corrosion resistance can be remarkably improved.

Third, as the pressure core part is formed to a length that is simultaneously fastened to the inner circumference of the lower side of the variable end and the insertion part, the variable end is expanded and deformed between the base material to be fastened and the restraint end by the rotational pressure, even if it is partially separated from the pressure core part. Since the screw fastening is maintained and the rotational force is continuously transmitted, the deformed variable end adheres to the fastening target base material, so fastening stability can be remarkably improved.

Fourth, since the coupling end is caught on the inner surface of the locking groove and the pressing core rotates by rotational force, the variable end can be compressed and deformed while moving upward along the screw thread, and the upper side of the hollow is free so that the screw groove is formed only at the end of the variable end. Since the thickness of the variable end becomes relatively thin while being expanded including the gap, it can be easily expanded and deformed.

1A and 1B are cross-sectional views showing a conventional blind rivet.
2 is a cross-sectional view of a blind rivet according to an embodiment of the present invention.
3a and 3c are cross-sectional views showing a state of use of a blind rivet according to an embodiment of the present invention.
4 is a cross-sectional view showing a modified example of a blind rivet according to an embodiment of the present invention.
5 is a cross-sectional view of a blind rivet according to another embodiment of the present invention.
6A and 6B are cross-sectional views showing a state of use of a blind rivet according to another embodiment of the present invention.
Figures 7a and 7c is an exemplary view of the coupling end applied to the present invention viewed from the top.

Hereinafter, a blind rivet according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. At this time, the blind rivet is inserted into the mounting hole formed in the parent material to be fastened and clamped. Here, it is preferable to understand that the fastening target base material is a plate material provided in a plurality of at least one or at least one side of which is overlapped with each other. Hereinafter, one side and the upper side are directions corresponding to each other, and the other side and the lower side are described and illustrated as being directions corresponding to each other. In addition, it is preferable to understand that the rotational pressing force described below includes the pressing force applied so that the variable end to be described later is compressed and deformed through the rotational force.

2 is a cross-sectional view of a blind rivet according to an embodiment of the present invention, and FIGS. 7a and 7c are exemplary views of a coupling end applied to the present invention viewed from above.

Referring to FIG. 2 , a blind rivet 100 according to an embodiment of the present invention includes a rivet body 10 and a pressing core 20 . Here, the blind rivet 100 according to an embodiment of the present invention is described as an example in which the rivet body 10 and the pressing core 20 are made of a metal material, but the materials of each part are It is not limited thereto, and may be provided with a high-strength plastic material or the like in some cases.

The rivet body portion 10 preferably includes a head portion 11 and an extension portion 12.

In detail, it is preferable that the head portion 11 is extended to an area exceeding the diameter of the mounting hole (h in FIG. 3a) formed in the parent material to be fastened (M in FIG. 3a). Through this, when the extension part 12, which will be described later, is arranged to pass through the mounting hole (h in FIG. 3a), the head part 11 is seated and brought into contact with one edge surface of the mounting hole (h in FIG. 3a). can

Here, the shape of the head portion 11 is not limited as long as its area exceeds the diameter of the mounting hole (h in FIG. 3a). For example, the head portion 11 may be formed in various shapes such as a circular shape or a polygonal shape when viewed from above, and preferably may be formed in a circular shape.

In addition, the head portion 11 may have a lower surface 11a concavely formed as the end portion of the head portion 11 is inclined downward in a rounded manner toward the outer side in the radial direction. Therefore, when the blind rivet 100 is clamped and fixed to the base material to be fastened (M in FIG. 3A) through the rotational force transmitted from the rotation means (D in FIG. 3A) described later, the head part 11 moves through the mounting hole ( It can be pressurized and adhered to one edge surface of h) of FIG. 3a. Through this, the deformed variable end (15 in FIG. 3c) and the head part 11, which will be described later, can be firmly fixed to one side and the other side of the parent material to be fastened (M in FIG. 3a) without play.

In addition, although not shown in the drawing, in this embodiment, the rotation restraining protrusion may protrude downward from the lower surface of the head part 11 . Therefore, rotation can be constrained when the rotation limiting protrusion presses and contacts the outer surface of the fastening target base material (M in FIG. 3A). Through this, when the rotating means (D in FIG. 3A) is rotationally driven, the rivet body portion 10 is rotated and supported by the base material to be fastened (M in FIG. 3A), and the pressing core portion 20 is substantially Only can be rotated. In addition, when the pressure core part 20 is rotated along the hollow 13 to be described later and moved upward, the other side of the extension part 12 may be compressed and deformed.

Preferably, the extension part 12 integrally extends from the head part 11 . That is, it is preferable to understand that the head portion 11 extends from one end side of the extension portion 12 in a radially outward direction.

In detail, the extension part 12 has a cross-sectional area corresponding to the inner diameter of the mounting hole (h in FIG. 3a) or smaller than the inner diameter of the mounting hole (h in FIG. 3a) in consideration of the minimum insertion tolerance. there is. In addition, the extension part 12 is preferably formed in a circular cross-sectional shape, and the extension length is set to a predetermined length or more so as to exceed the thickness or overlapping thickness of the parent material to be fastened (M in FIG. 3A) this is preferable

Here, the extension part 12 preferably includes an insertion part 14 and a variable end 15. In detail, the insertion part 14 is a part connected to the head part 11 in the extension part 12 extending in the longitudinal direction, and is inserted into and accommodated inside the mounting hole (h in FIG. 3a). It is desirable to understand Further, it is preferable to understand that the variable end 15 integrally extends from the insertion part 14 and protrudes to the other side of the mounting hole (h in FIG. 3a).

It is preferable to understand that the inserting portion 14 and the variable end 15 are arbitrarily divided substantially corresponding to the positions of the upper and lower ends of the extension portion 12 . That is, regardless of the length of the extension part 12, the part inserted into and accommodated in the mounting hole (h in FIG. 3a) is the insertion part 14, and protrudes to the other side of the mounting hole (h in FIG. 3a). It is preferable to understand that the part to be divided into the variable end (15). Accordingly, the insertion portion 14 and the variable end 15 may be divided into regions according to the total length of the extension portion 12 and the overlapping thickness of the parent material to be fastened (M in FIG. 3A).

It is preferable that a hollow 13 is formed through the rivet body 10 along the longitudinal direction of the central portion. In detail, the hollow 13 is formed by simultaneously and continuously penetrating the head part 11 and the extension part 12 . At this time, it is preferable that the screw groove 16 is formed on the inner circumferential surface of the hollow 13 along a predetermined length area. Here, the predetermined length region may be a portion corresponding to the entire inner circumference of the hollow 13, as seen in one embodiment of the present invention, and as in other embodiments described later, the inner circumference of the other end of the hollow 13 It may correspond to a part.

On the other hand, the pressure core part 20 is inserted into the hollow 13, and is rotated as the rotational force of the rotation means (D in FIG. 3A) is transmitted. Here, the pressing core part 20 preferably includes a coupling end 21, a restraining end 23 and a screw thread part 22.

In detail, it is preferable that the coupling end 21 is provided at one end of the pressing core part 20, and a coupling groove 24 to which the end of the rotating means (D in FIG. 3A) is coupled is formed. Here, it is preferable that the coupling groove 24 is formed with a rotational force transmission surface capable of receiving rotational force during rotation by inserting an end portion of the rotation means (D in FIG. 3A). That is, when the rotating means (D in FIG. 3A) is rotated, the pressing core part 20 can be rotated as the rotational force is transmitted through the rotational force transmission surface.

At this time, as shown in FIGS. 7A to 7C , the coupling groove may be formed as a polygon such as a hexagon 24a, a cross 24b shape, or a star (Torx/Torx plus, 24c) shape groove. Therefore, when the rotating means (D in FIG. 3A) is rotated, rotational force can be stably transmitted as the end of the rotating means (D in FIG. 3A) is engaged with the polygonal coupling groove 24.

The coupling groove 24 may be formed to be located inside the hollow 13 in a state in which the variable end 15 is expanded and deformed through a length or shape structure described later. That is, in the present invention, the structure protruding outward from the head portion 11 can be fundamentally eliminated.

Of course, in some cases, a coupling protrusion protruding to one side may be formed at the coupling end 21, and a rotation groove is formed at the end of the rotating means (D in FIG. 3A) by inserting the coupling protrusion to transmit rotational force. It could be. At this time, the sum of the lengths of the coupling protrusion and the pressing core portion may be set corresponding to a length relationship described later. That is, if the variable end 15 is deformed so that no protruding structure is formed on the upper side of the head part 11 even if the structure coupled to the rotating means (D in FIG. 3A) is formed as a protrusion, the scope of the present invention is set. belongs to

On the other hand, in one embodiment of the present invention, it is preferable to understand that the coupling end 21 is a portion corresponding to the upper region of the pressing core portion 20. That is, in one embodiment, the coupling groove 24 may be integrally recessed at one end of the pressurized core part 20 .

Also, the restraining end 23 is provided at the other end of the pressing core part 20, and is preferably fastened and restrained at the other end of the extension part 12. Here, in one embodiment of the present invention, the restraining end 23 is provided on the other end side of the pressing core part 20, and at this time, the restraining end 23 has a transverse cross-sectional area of the pressing core part 20 It can be formed stepwise in excess. In addition, the threaded portion 22 is formed along the outer circumferential surface of the pressing core portion 20, and can rotate in engagement with the threaded groove portion 16 through the rotational force of the rotating means (D in FIG. 3A).

3A and 3C are cross-sectional views showing a state of use of a blind rivet according to an embodiment of the present invention. Hereinafter, the other end side of the extension part 12 is preferably understood as a part corresponding to the variable end 15. 3A, L1 is the total length of the rivet body 10, L2 is the total length of the extension part 12, L3 is the total length of the head part 11, and L4 is the variable end 15 L5 is the thickness of the fastening target base material (M) or the length of the insertion part 14, L6 is the length of the pressing core part 20, and w1 is the cross section of the variable end 15 indicates the thickness.

Referring to FIGS. 3A to 3C , in the rivet body 10, the extension part 12 is disposed passing through the mounting hole (h), and the head part 11 is connected to the fastening target base material (M). is seated in contact with one side of the At this time, the screw groove portion 16 is preferably continuously formed along the inner circumference of the hollow 13, and the longitudinal direction of the hollow 13 corresponding to the inside of the head portion 11 and the extension portion 12 It can be formed as a whole along.

In addition, the pressing core part 20 is inserted into the other end of the extension part 12, and the screw thread part 22 is screwed into the screw groove part 16, and the restraining end 23 is the extension part ( The other end of 12) protrudes outward.

In detail, the restraining end 23 integrally extends from the end of the pressing core part 20 and may be disposed outside the variable end 15, or the restraining end 23 may be the pressing core part ( 20), but provided as a separate part, it may be coupled and fixed to the other end of the pressurized core part 20.

At this time, it is preferable that the restraining end 23 is formed to extend in a radially outward direction stepwise with the pressing core part 20 . That is, the restraining end 23 may be formed with a cross-sectional area in which the one-sided edge 23a exceeds the inner diameter of the hollow 13 . Through this, one side edge 23a of the restraining end 23 can be caught on the other end of the variable end 15 .

Meanwhile, the end of the rotation unit D is inserted into the coupling groove 24 formed in the coupling end 21, and rotational force is transmitted to the blind rivet 100 as the rotation unit D is driven. . At this time, although not shown in the drawing, a pressing means for pressurizing and supporting the head part 11 toward one side of the fastening target base material M may be further provided. This pressing means may be integrally formed with the rotation means (D), or may be provided as a separate member in some cases. Through this, the rotational force of the rotating means (D) can be substantially transmitted to the pressing core part (20).

The pressing core part 20 receiving rotational force from the rotating means D rotates along the threaded groove part 16 and moves upward, and the restraining end 23 side is the other surface of the base material M to be fastened. can be moved sideways.

At this time, since the one-side edge 23a of the restraining end 23 is caught on the other end of the variable end 15, it is fastened and restrained, so that the pressure core part 20 is rotated by the rotational force and the head part ( 11) can be moved upwards. Therefore, the variable end 15 can be expanded and deformed in a radially outward direction while being compressed between the fastening target base material M and the restraining end 23 . In addition, the blind rivet 100 can be clamped and fixed to the mounting hole h through the deformed variable end 15a and the head portion 11, and the base material to be fastened M overlapped with at least one of them. ) may be coupled through the blind rivet 100.

Here, it is preferable that the pressing core part 20 is simultaneously fastened to the inner circumference of the variable end 15 and the lower inner circumference of the insertion part 14 . That is, the length L6 of the pressing core part 20 may be formed to exceed the length L4 of the variable end 15 . This is preferably understood as having the same meaning as that the length L6 of the pressurized core part 20 is formed to exceed the length between the lower end of the extension part 12 from the parent material M to be fastened.

In detail, when the pressing core part 20 is inserted into the hollow 13 and the restraining end 23 is fastened and restrained to the other end side of the extension part 12, the coupling end 21 side is the insertion part It may be disposed inside one side in the longitudinal direction of (14). At this time, when the pressing core part 20 rotates through the rotating means D, the variable end 15 is pressed between the fastening target base material M and the restraining end 23, so that the variable end ( 15) is spaced apart from the outer circumference of the pressing core part (20).

Here, since the pressure core part 20 is formed to exceed the length L4 of the variable end 15, the pressure core part 20 is formed on the lower inner circumference of the variable end 15 and the insertion part 14. It can be formed in a length that is simultaneously fastened to. At this time, the lower side of the insertion portion 14 is a portion where the insertion portion 14 and the variable end 15 are connected, and is preferably understood as a portion corresponding to the other end of the insertion portion 14. .

Through this, even if the inner circumference of the hollow 13 on the side of the variable end 15 is spaced apart from the outer circumference of the pressing core part 20, the side of the coupling end 21 is the inner circumference of the hollow 13 on the insertion part 14 side. The screwed state can be maintained in the screw groove 16 formed in. Accordingly, the pressure core part 20 can be continuously rotated along the screw groove part 16, and through this, the variable end 15 can be expanded and deformed in a radially outward direction while being compressed.

Moreover, since the threaded portion 22 of the blind rivet 100 is screwed into the threaded portion 16 and rotated, the pressing core portion 20 is rotated at the pitch of the threaded portion 22/threaded groove portion 16. Correspondingly, it can be rotated and transferred at uniform intervals. Therefore, since a constant compressive force is transmitted to the variable end 15, it can be deformed into a uniform thickness and shape. Through this, since the fastening force for each rivet can be formed to be substantially the same, the fastening force can be remarkably improved.

At this time, it is preferable that the length (L6) of the pressing core part (20) exceeds the length (L4) of the variable end (15) but is less than the length (L1) of the rivet body part (10). Moreover, the length L6 of the pressurized core part 20 may be less than the sum of the length from the head part 11 to the insertion part 14 and the lengths changed by overlapping the variable ends. can That is, the length L6 of the pressing core part 20 is the length L3 of the head part 11, the length L5 of the insertion part 14, and the length of the deformed variable end 15a. It can be formed with less than the combined length. Here, the length of the deformed variable end 15a is preferably understood as the length of the cross-sectional thickness w1 of the variable end 15 that is deformed and overlapped.

Therefore, one end of the pressing core part 20 in which the coupling groove 24 is formed may be formed to be positioned inside the hollow 13 even after the variable part 15 is compressed and deformed. Accordingly, even when the variable end 15 is expanded and deformed, one end of the pressing core part 20 does not protrude outward from the head part 11, and thus the coupling groove 24 is formed in the hollow ( 13) Can be stored inside. Through this, a cumbersome post-processing process of cutting one end of the pressing core part 20 protruding outward from the head part 11 is substantially omitted, so that work convenience can be remarkably improved. In addition, since the problem of corrosion when the cut surface is exposed to the outside after cutting the pressurized core part 20 is substantially eliminated, corrosion resistance can be remarkably improved.

Furthermore, according to the present invention, the variable core part 20 is only required to be long enough to transmit rotational pressure to the variable part 15 relative to the length of the rivet body part 10 . Through this, the core must be formed long so that the pulling force is transmitted to the rivet, and since the material used for such a long time is substantially discarded after cutting, the amount of material required is significantly reduced compared to the prior art, in which material waste increased. Economic efficiency can be improved. .

4 is a cross-sectional view showing a modified example of a blind rivet according to an embodiment of the present invention. In this modification, since the basic configuration except for the restraining end 123 is the same as that of the above-described embodiment, a detailed description of the same configuration will be omitted.

Referring to FIG. 4 , the restraining end 123 may be formed in a conical shape extending from an end of the pressure core part 120 and gradually expanding its cross-sectional area toward the other side. Therefore, when the pressing core part 120 is rotated through the rotational force transmitted through the rotating means, the restraining end 123 is moved to the other side of the fastening target base material M. At this time, the restraining end 123 is drawn into the hollow 13, and the inner circumference of the other end of the hollow 13 is pressed against the inclined surface portion 123b formed on the outer circumferential surface, thereby expanding and deforming in the radially outward direction.

In addition, the outer surface of the deformed variable end 15b is pressed and brought into contact with the rim surface of the other side of the mounting hole h. Through this, the blind rivet 100A may be clamped and fixed to the mounting hole h through the deformed variable end 15b and the head portion 11 .

5 is a cross-sectional example of a blind rivet according to another embodiment of the present invention, and FIGS. 6A and 6B are cross-sectional views showing a state of use of the blind rivet according to another embodiment of the present invention. Since the basic configuration of the blind rivet 200 according to the present embodiment except for the hollow 213 and the pressing core part 20 is the same as that of the above-described embodiment, a detailed description of the same configuration will be omitted. Meanwhile, in FIG. 6A , L4 represents the length of the variable end 215, L7 represents the length of the narrow portion 213b, and L8 represents the length from the lower surface of the locking groove 218 to the end of the variable end 215. did it

Referring to FIG. 5 , the hollow 213 may be penetrated by including a spaced through portion 213a and a narrow portion 213b.

In detail, the spaced through part 213a is formed to correspond to one side of the hollow 213, and the inner diameter of the spaced through part 213a includes a margin exceeding the maximum outer diameter of the threaded part 222 can be formed Also, the narrow portion 213b protrudes radially inward from the inner circumference of the other side of the spaced through portion 213a, and the screw groove 216 may be formed on the inner circumference of the narrow portion 213b. Accordingly, the pressing core part 220 may be provided by being screwed into the screw groove part 216 formed on the inner circumference of the narrow part 213b.

The coupling end 221 may be formed to extend beyond the cross-sectional area of the pressure core part 220, and the coupling end 221 and the pressure core part 220 may be provided stepwise. Here, the coupling end 221 may be formed integrally with one end of the pressing core part 220, and in some cases, the coupling end 221 formed with the coupling groove 224 is provided separately, but the pressing core It may be provided by being fixed to one end of the unit 220.

In addition, a locking groove 218 is recessed in the head portion 211 so that the coupling end 221 is accommodated therein, and the locking groove 218 may communicate with one side of the hollow 213 . At this time, the locking groove 218 may be recessed to have an inner space equal to or greater than the cross-sectional area and thickness of the coupling end 221 in the transverse direction. Accordingly, in a state in which the pressing core part 220 is inserted into the hollow 213, the coupling end 221 can be substantially accommodated in the locking groove part 218 without protruding upward.

At this time, the pressing core part 220 is inserted through one side of the hollow 213 opened toward the head part 211, and the screw thread part 222 is formed in the narrow part 213b. The screw groove part ( 216) can be screwed into. In addition, as the bottom edge of the coupling end 221 is caught in the locking groove 218, the insertion depth of the pressure core part 220 may be limited.

The constraining end 223 may be provided at the other end of the pressure core part 220 . In this case, the restraining end 223 may be integrally formed with the other end of the pressure core part 220 . That is, the lower end in the longitudinal direction of the pressing core part 220 on which the screw thread part 222 is formed may function as the restraining end 223 . As such, in this embodiment, the pressing core part 220 may be formed in a bolt shape with the coupling groove 224 formed at the upper end side.

6A to 6B, the end of the rotating means (D) is inserted into the coupling groove 224 formed at the coupling end 221, and as the rotating means (D) is driven, the blind rivet ( 200) is transmitted to the rotational force. And, the pressure core part 220 receiving the rotational force from the rotation means (D) can be rotated.

At this time, as the coupling end 221 is caught in the locking groove 218, the transfer of the pressing core part 220 is restricted, and thus can rotate continuously. Therefore, the other end side of the variable end 215 screwed to the screw thread portion 222 can be moved to the other side of the base material M to be fastened while being rotated along the longitudinal direction of the pressing core portion 220 . In addition, the variable end 215 may be expanded and deformed in a radially outward direction while being compressed between the fastening target base material M and the narrow portion 213b. Also, the blind rivet 200 may be clamped and fixed to the mounting hole h through the deformed variable end 215a and the head portion 211 .

In this case, the narrow portion 213b is formed inside the other end of the hollow 213 and may be formed corresponding to an area less than the length of the variable end 215 . Accordingly, a portion of the variable end 215 protruding between the narrow portion 213b and the other surface of the parent material M to be fastened may be formed to be relatively thin. Through this, the variable end 215 can be easily compressed and expanded and deformed.

In this case, terms such as "include", "comprise" or "have" described above mean that the corresponding component may be present unless otherwise stated, excluding other components. It should be construed as being able to further include other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs, unless defined otherwise. Commonly used terms, such as terms defined in a dictionary, should be interpreted as being consistent with the contextual meaning of the related art, and unless explicitly defined in the present invention, they are not interpreted in an ideal or excessively formal meaning.

As described above, the present invention is not limited to the above-described embodiments, and it is possible to modify and implement the present invention by those skilled in the art without departing from the scope claimed in the claims of the present invention. And, such modifications fall within the scope of the present invention.

M: Base material to be fastened h: Mounting hole
10: rivet body 13: hollow
15: variable end 16: screw groove
20: pressurized core part 21: coupling end
22: screw thread 23: restraint end
100: blind rivet

Claims (12)

In the blind rivet inserted into the mounting hole formed in the base material to be fastened and clamped,
A head portion extending in a cross-sectional area exceeding the diameter of the mounting hole so as to come into contact with an edge surface of one side of the mounting hole, and an extension portion extending from the head portion to pass through the mounting hole, the head portion and the extension portion passing through at the same time A rivet body portion through which a hollow formed along an inner circumferential surface along a predetermined length region is penetrated in the longitudinal direction; and
A restraining end inserted into the hollow and fastened and constrained to the other end of the extension is provided at the other end, and the other end of the extension is pressed between the mounting hole and the restraining end to provide a rotational pressure for expansion and deformation. A blind rivet comprising a press core portion having a screw groove portion engaged with and rotated by a rotating means along an outer circumferential surface and having a coupling end to which an end portion of the rotation means is coupled to one end. According to claim 1,
The coupling end is formed with a groove so that the end of the rotating means is inserted, and a rotational force transmission surface is formed on the inner surface. Blind rivet, characterized in that the coupling groove is included. According to claim 2,
The coupling groove is formed to be positioned inside the hollow in a state in which the variable end is pressed and expanded and deformed. According to claim 1,
The extension part includes an insertion part accommodated inside the mounting hole and a variable end integrally extending from the insertion part and protruding to the other side of the mounting hole,
The blind rivet, characterized in that the pressing core part is simultaneously fastened to the inner circumference of the variable end and the inner circumference of the lower side of the insertion part. According to claim 4,
The screw groove is formed continuously along the inner circumference of the hollow,
Blind rivets, characterized in that the pressing core portion is formed less than the length of the rivet body portion. According to claim 5,
The blind rivet, characterized in that the length of the pressing core portion is less than the sum of the length from the head portion to the insertion portion and the variable end by overlapping deformation. According to claim 4,
The restraint group
It extends from the end of the pressing core part and is disposed outside the variable end,
Blind rivets characterized in that the cross-sectional area exceeds the inner diameter of the hollow and is formed stepwise with the pressing core so that one side edge is caught on the other end of the pressing end. According to claim 4,
The restraint group
Doedoe extending from the end of the pressurized core portion,
Blind rivets characterized in that the blind rivet is formed in a conical shape with a cross-sectional area gradually expanding toward the other side so that the variable end is expanded and deformed in a radially outward direction while being drawn into the hollow through the rotational pressing force. According to claim 1,
The hollow includes a spaced through portion formed including a margin exceeding the maximum outer diameter of the threaded portion,
The screw groove protrudes radially inward from the inner circumference of the other side of the spaced through part and is formed on the inner circumference of the narrow part formed corresponding to a region less than the length of the variable end. According to claim 9,
The coupling end exceeds the cross-sectional area of the pressing core portion but is formed to be accommodated in a locking groove formed recessed at one side of the hollow,
The blind rivet, characterized in that the pressing core part extends longer than the length between the catching groove part and the other end of the extension part. In the blind rivet inserted into the mounting hole formed in the parent material to be fastened and clamped,
A head portion extending in a cross-sectional area exceeding the diameter of the mounting hole so as to come into contact with the edge surface of one side of the mounting hole, and an extension portion having a variable end extending from the head portion to pass through the mounting hole and protruding to the other side of the mounting hole. Including, but through the head portion and the extension portion at the same time, the inner circumferential surface of the rivet body through which the hollow threaded grooves are formed continuously in the longitudinal direction; and
It extends to a length that exceeds the length of the variable end but is less than the length of the rivet body and is inserted into the hollow, and is disposed outside the extension and has a cross-sectional area exceeding the inner diameter of the extension so that one edge is caught on the other end of the extension. A restraining end fastened and restrained at the variable end side is provided at the other end, and the variable end is pressed between the other end of the mounting hole and the restraining end to provide rotational pressure for expansion and deformation through a rotating means. A blind rivet comprising a pressurizing core portion, wherein a screw groove rotated in engagement with the screw groove portion is formed in one direction along an outer circumferential surface, and a coupling end into which an end of the rotation means is inserted and coupled is formed at one end. In the blind rivet inserted into the mounting hole formed in the base material to be fastened and clamped,
A head portion extending in cross-sectional area exceeding the diameter of the mounting hole so as to come into contact with the rim surface of one side of the mounting hole, and having a hooking groove recessed at one end, and extending from the head portion to pass through the mounting hole to the other side of the mounting hole. An extension portion having a protruding variable end, wherein the head portion and the extension portion simultaneously pass through, and a hollow in which a threaded groove is formed on the inner circumference of a narrow portion protruding in a radially inward direction on an inner circumference corresponding to the variable end penetrates in the longitudinal direction. The rivet body portion; and
It is formed with an outer diameter less than the inner diameter of the hollow and is inserted into the hollow by extending beyond the length of the extension part, and a restraining end fastened to the variable end side is provided at the other end, and the variable end connects to the other end of the mounting hole and the A screw groove portion engaged with the screw groove portion and rotated through a rotating means is formed in one direction along the outer circumferential surface to provide a rotational pressure force for expansion and deformation by being pressed between the restraining ends, and a coupling end into which an end portion of the rotation means is inserted and coupled to one end. A blind rivet including a pressing core portion formed in a shape accommodated in the engaging groove portion.

Images