JPS60256612A - Rivet assembly - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rivet, and more particularly to a rivet that can be installed and tightened on a workpiece when only one side of the workpiece is accessible.

Rivets are known that can be attached to a workpiece from the front side of the workpiece without the user having to approach the rear or blind side. Such rivets are used in a variety of applications.

One of them is U.S. Patent No. 1 by the same person. No. 73,205,
The disclosed rivet assembly includes a cylindrical rivet and a lock pin.The lock pin is connected to the shank of the rivet. The locking pin is inserted through the end and extends outwardly through the head. This outwardly extending end is gripped by a tensioning device, while the other end of the locking pin is slightly smaller than the inside diameter of the cylindrical rivet. This rivet assembly is positioned into the hole in the workpiece so that the head is located outwardly and the other end extends beyond the blind side of the workpiece. When the end of the bow is pulled by the tensioning device,
Press the enlarged portion against the blind side of the lock pin and wedge it into engagement with the inside of the cylindrical shank of the rivet. This expands the rivet on the blind side of the workpiece. Once the blind end of the rivet expands to a size larger than the hole in the workpiece, the rivet is permanently set in place.

While the above-mentioned U.S. patent had many advantages over other known devices, it was the inventor's desire to provide a rivet assembly in which locking pins and rivets with high shear strength could be satisfactorily used. That's what I did. Generally, as shear strength increases, malleability decreases, and therefore there is a limit to setting a high shear strength. This is because it is necessary to use a sufficiently malleable material in order for the locking pin to be drawn tightly into the cylindrical shank of the rivet. Furthermore, to provide a rivet assembly that can be used for blade parts having a wide range of thickness, that is, an assembly equipped with a lock and a pin that self-adjusts so that the rivet tightly locks from a thin processed part to a thick processed part. This is desirable.

These problems are achieved by the present invention.

The present invention relates to a rivet assembly suitable for securing together a pair of workpieces, such as a pair of metal pieces, when only one side (hereinafter referred to as the front or front side) is accessible. The assembly has the general shape described above and includes: a rivet having an enlarged head, a cylindrical shank, and a hole passing through the shank and the head; It consists of a lock pin for fixing to the The locking pin has a relatively narrow cylindrical neck that fits within a rivet hole and a slightly thicker body portion that is axially aligned with and integrally formed with the neck. .

An expanding skirt portion is provided between the neck portion and the main body portion, the skirt portion is connected to the main body and surrounds the outer periphery of the neck portion, and an annular recess terminates in a cutting groove between the scut portion and the neck portion. ing. The skirt slopes from a relatively narrow tip that fits into the rivet hole to an annular ridge intermediate the skirt juncture and the body of the locking pin. The ridge has a diameter that is larger than the diameter of the hole and the adjacent portion of the body.

The body of the bottle also has integrally a series of deformable locking rings segmented by an annular groove running around the body. These ring diameters are larger than the body diameter and the groove diameters are not larger than the body diameter and preferably smaller than the body diameter. When the pin is pulled into the shank of the rivet, the raised part of the expanding skirt expands from the top of the shank 1) and spreads outward, simultaneously pushing the skirt tightly toward the blind side of the inner machined piece. Caulk the part. When the bottle body is pulled into the shank, the deformable locking ring is also pulled into the shank and crushed into the adjacent groove, and the crushed and deformed part due to the thickness of the workpiece is riveted. That's what I do.

In a preferred embodiment of the invention, the wall cross-section of the expanded skirt is elbow-shaped, tapering at its narrowest point at the curvature that flares outward from the elbow to form an annular ridge. The diameter of the end of the neck increases near the connection with the main body on the inside of the expandable skirt. When the neck of the bottle is retracted into the rivet, the expanding skirt between the elbow and the pin body expands outwards, locking the pin to the rivet, and at the same time the skirt beyond the elbow expands outwards to lock the pin into the rivet. The remaining portion bends inward towards the axis of the hole through the rivet head.

That is, in the cylindrical blind rivet assembly of the present invention, the locking pin has an expanding skirt and an annular ridge which clamp the workpieces together and expand the blind end of the rivet, which then closes the rivet and the workpiece. □Lock the pieces together.

Spaced locking links. Wow, □, 6ゎ.

+7)IJ-<7)iJl)・('The body can also be applied to force-loe sections of different thicknesses.

A specific example will be described below.

FIG. 1 shows a rivet assembly 10 comprising a blind rivet 12 and a locking pin 14. Figures 2-6 sequentially illustrate the steps for using the present rivet assembly 10f to rivet the front piece 16 and the rear piece 18 together. These pieces usually consist of a pair of metal sheets, such as aluminum steel.

These sheets are provided with circular alignment holes 20,22. These holes are sized to accommodate the entire rivet assembly except for the rivet head 24. Preferably, the outer diameter of the cylindrical shank portion 26 is slightly smaller than that of the bore 20,22. This allows the rivet to be easily fitted into the hole, and when the riveting operation as described below is completed, the rivet will fully expand into the hole and fill it.

The lock pin 14 is a series of land portions 3 as shown in FIG.
2 and a retracting portion 30-i having a groove portion 34. This recess 30 is integrally connected to a circular neck 36 .

The neck 3G is sized to fit within the hole 38 of the cylindrical shank 26. In addition, the neck 36 is the lock pin 1
It is integrally connected to the main body portion 40 of No. 4. Body portion 40, like neck 36, is generally a solid metal body, but has a varying diameter along body portion 4o, which initially has a diameter slightly smaller than the inside diameter of bore 38. It's getting bigger. The body portion 94.0 is pulled to a reduced diameter as it is retracted into the bore 38 and simultaneously expands the cylindrical shank portion 26 by expanding the walls of the shank portion 26 radially outward. Hole 2 of piece ('1,22σ
] A 9F tight fitting low alloy is formed between the wall and the wall. O body part 4
o is provided with an expanded skirt portion 42. The skirt portion 42 slopes from the tubular tip 44 to the cylindrical ridge 16, then slopes inwardly and joins outwardly to the body portion 4o near the junction of the circular neck portion 36 and the body portion 40. are doing.

The cylindrical shank portion 26 of the rivet 12 has an expandable end 50 at its inner end. The inflatable end also has an enlarged hole 52 on its inside.

As shown in FIGS. 2 and 3, this enlarged hole has a front dimension such that the tip of the enlarged skirt portion 42 can be inserted therein.

To install a workpiece helical rivet, the rivet subassembly is first positioned within the alignment hole 20.22 of the workpiece as shown in FIG. The rivet tool 60 is engaged with the land portion 32 and the groove portion 34 on the retracted portion 30 of the lock pin 14, and the die 66 is pressed against the upper surface 68 of the rivet. The lock pin is then pulled up by the rivet tool 60 through the hole 38 in the cylindrical shank portion 26 of the rivet 12. In this case, the head 24 of the rivet is held firmly against the inner surface 70 of the front piece 16.

As the locking pin is pulled up the inner surface of the bore 38, the enlarged skirt 42 is pulled and compressed into the enlarged bore 50 of the cylindrical shank 26, as shown in FIGS. Since the flared skirt section 42 slopes from a fairly narrow tip 44 to an enlarged cylindrical ridge 46, it pushes the wall of the cylindrical shank section 26 radially outwardly into two sections 16, 18. are brought together to close the gap 72 (shown in an enlarged view in FIG. 2) and press the two pieces together (see FIG. 3), creating an enlarged hip portion 74 on the shank portion 26, and forming an enlarged hip portion 74 on the shank portion 26. Lock the pieces together.

In a preferred embodiment of the invention, the cylindrical ridge 46 is somewhat larger than the diameter of the body portion 40 so that during the initial stages of pulling the pin 14 within the shank portion 26, as shown in FIG. An annular space 75 is provided between 26 and the body of the locking pin 14 . Thus, the only frictional force exerted for pulling up the pin is between the sloped outer surface of the flared skirt section 42 and the inner wall surface of the shank section 26.

When the rivet tool 60 further pulls up the lock pin i4 through the hole in the rivet as shown in FIG. The body portion 40 of the locking pin 14 expands the wall of the cylindrical shank portion 26 against the wall of the bore 20.22, rigidly securing the rivet in that position.

The body of the shank has a series of deformable locking rings 80 separated by grooves 82.

The amount of metal in each locking ring extending radially outward from the body of the lockvisi corresponds to the volume of the adjacent groove inward of that ring, so that the locking pin shown in FIGS. 5 and 6 When pulled into the cylindrical shank, the deformable locking ring is deformed and pressed into the rear groove. Simultaneously with the deformation of each locking ring, the radius of the hip portion 74 of the cylindrical shank 26 decreases, and this hip portion
The blind side 84 of 8 is further suppressed. This increases the tensile strength of thin workpieces to a point where they can be compared with thicker workpieces.

As shown in FIGS. 2 and 3, the front surface 83 of each locking ring slopes rearwardly away from the pin body.

Preferably, this diagonal angle is approximately 15° to 45° with respect to the horizontal.
The angle is preferably about 25° to 35°. A peripheral weakened line 85 is provided at the front intersection of the pin body and each locking ring. This line of weakness constitutes a reduced diameter section that allows the locking ring to deform and pivot rearwardly without being cut when pulled into the rivet, as shown in Figures 4 and 8. I have to.

The rear surface 87 of the locking ring is normally horizontal or perpendicular to the axis of the locking pin.

However, an alternative configuration is shown in FIG. In this example, the rear surface 87 is inclined slightly forward. Such a configuration allows for the selection of materials that provide the best results for each intended use. For example, unlike the applicant's invention, other bed and pin assemblies often use very soft sleeve materials and attempt to expand the sleeve by compressing the sleeve axially from both ends. Applicant's geometry allows the use of hard sleeve materials with very high shear and tensile strengths. 9 to expand the sleeve outwardly for attachment to the workpiece;
It may be desirable to use a locking ring as shown. This is because these rings do not deform as easily as those of FIGS. 2-6. As shown in FIG. 9, the rearward angle of the rear surface 87 should be less than about 15 degrees from the horizontal, preferably in the range of about 2 to 8 degrees, depending on the malleability of the ring and the hardness of the sleeve to be expanded. Will.

FIG. 5 also shows the initial expanded state of the expanding skirt portion 42 when it is pressed against the die 66. The head portion 24 of the rivet 12 has an inner annular recess or plate portion 86.
have. The volume of this dish portion is large enough to accommodate the metal volume of the expanded skirt portion 42. When the expanded skirt is fully expanded as shown in FIG. 6, it essentially completely fills the space within the pan 86. In the same position where the expansion skirt is fully linearly compressed and fully radially expanded within the dish, one or more locks 97/80 are inserted into the expansion hole 51') on the inner shoulder. 94 and into the inflatable end 50 of the cylindrical shank. Axial movement of the pin relative to the rivet is thus prevented. The rivet tool 60 then attempts to draw the locking pin 14 further into the cylindrical shank portion, 26, and this single-layer movement is caused by the impact of the upper surface 67 of the die 66 against the skirt portion 42, causing the rivet tool 60 to
As the lock pin is locked, the raised portion and cylindrical neck of the locking pin break away from the body portion 40 at break neck groove 96.

This groove 96 is located near the base of the expanded skirt 7 and the cylindrical neck and body of the lockvise. This break neck groove 76 consists of a groove in the circumferential surface of the locking pin, so that the break in the metal occurs along a relatively uniform plane, so that the break neck groove 76 has a surface 98 as shown in FIG. It is relatively smooth.

After the neck is cut from the main body, the rivet tool and neck are removed, leaving the pet head exposed on the front of the workpiece.

Figure 8 shows a state in which a one-to-zero sword is completely stopped, which is thinner than that shown in Figure 2-1-6.
There is. As can be seen, this rivet can provide a similar joint to that provided for thicker blades. This connection consists of a plurality of deformable locking rings 80α, Bo
b, 80c and adjacent grooves 82 spaced along the end of the locking pin. As shown in FIG. 8, only the first locking ring 80cL has been substantially deformed by entering the cylindrical shank portion within the bore of the inner workpiece. Use of a similar riveting device on thicker workpieces provides equally satisfactory results up to the point where the final locking ring 80c is near the enlarged hip 74. This riveting device thus offers the versatility of being used for workpieces of different thicknesses than could previously be obtained with such devices. Furthermore, while the illustrated example only has three locking rings, it will be appreciated that four or more locking rings should be used for maximum versatility in the use of this device.

FIG. 8 also shows an alternative method of securing a locking pin to a rivet neck by simply using a bottle neck washer 90f. Here, the washer is the die face 6 as shown in Figure 2.
7 functions effectively.

FIG. 7 shows the closed form of the expanded skirt and the adjacent parts of the neck and body of the lockbi. As shown in the figure, the expansion skirt portion 42 has a bent portion 100′i at the intermediate portion between the top portion of the skirt portion and the joining portion of the skirt portion to the pin body 40.
have. This bent portion 100 is the neck portion 3 of the lock pin.
It is directed toward the front of the broken neck portion 96 near the enlarged diameter portion 102 of No.6. This tapered expanded diameter portion 102 has a cylindrical raised portion 46.
has a diameter such that when the protrusion 46 is pulled through the hole of the rivet as shown in FIG. .

As a result, when the neck portion is pulled out from the main body and broken as shown in FIGS. 5 and 6, the expansion skirt portion is bent into a diamond shape due to compression, and the top portion enters inward to fill the recess of the dish portion 86. The enlarged diameter portion 102 of the widened neck bends the flared skirt portion outwardly from its joint as shown in FIGS. 24 Herosoku. The weak curved part lOO has a thinner wall thickness than the other parts of the flared skirt.
By having this, an extra thick part of the skirt part is formed at the bottom part where the skirt part joins to the main body part, so that the skirt part can be partially expanded easily and completely locked to the rivet head. This allows for the use of an assembly with greatly improved shear strength due to the reinforced pin material thickness that virtually penetrates the rivet hole.

Many other uses and modifications of the invention will be apparent to those skilled in the art. Specific embodiments of the invention have been described herein for purposes of illustration only. In short, the scope of the present invention is limited only by the description of the claims. As used within the scope of the claims, the term "pa workpiece" includes both single pieces and Z or more workpieces riveted together.

[Brief explanation of drawings]

Figure 1 is a perspective view of the rivet assembly, Figure 2 is a partial sectional view of the rivet assembly inserted into the opening of a pair of processed pieces to be joined together, and the rivet assembly and the bet tool. The figures are similar to Figure 2 with a portion of the locking pin of the rivet assembly retracted into the cylindrical shank of the rivet, and Figure 4 is a view showing the locking pin further retracted into the rivet shank. Figure 5 is a view similar to Figure 3, and Figure 5 shows the lock pin fully retracted into the shank and the expansion skirt on the lock pin deformed and expanded outward to engage the rivet head. Same as Figure 4. Figure 6 shows the rivet after the lock pin's cylindrical neck has been broken off from the main body after the rivet work is completed, and Figure 7 shows the expanded skirt of the lock pin and the vicinity of the neck and main body. FIG. 8, a partially cutaway sectional view, similar to FIG. 6, with the beam bed installed in a thin workpiece; and FIG. 9, a modification of the locking ring around the body of the locking pin. Explanation of symbols 10: Rivet assembly 12: Rivet 14: Lock pin 16: Front piece, 1j (・ 18: Rear piece 20.22: Aligning hole 24: Head part 26: Cylindrical shank part 30: Retractable part 40 : Main body part 42: Expanding skirt part 46: Cylindrical raised part 50: Expandable end 60: Rivet tool 80: Locking ring 84: Blind side 85: Peripheral weakened line 96: Fractured neck groove (5 people outside)

Claims (1)

[Claims] (1) 7Jl] A rivet assembly suitable for fixing through a hole in the blade part from the front side of the piece without approaching the blind side of the piece, , a head portion larger than the hole in the workpiece, and the hole is configured such that the blind end passes through the hole and projects beyond the blind side of the workpiece when the head engages the top surface of the workpiece. an elongated rivet having a common hole extending axially through both parts, an elongated rivet having a common hole extending axially through the shank part; an elongated recessed part at one end; A locking pin having a generally cylindrical body portion, an elongated neck portion between the two portions, and a weakened portion formed at the junction of the neck portion and the body portion to avoid excessive axial torsion. an elongated, integrally formed locking pin which separates the neck from the body portion at the joint portion when the body portion is latched; a base having a plurality of locking rings formed therein and a hollow expanding skirt portion, the skirt portion being joined to the body near the joint with the neck portion, and a joint between the body and the neck portion; an open end portion surrounding the neck portion near the neck portion, the skirt portion being retracted from the weakened portion thereby providing an annular space between the skirt portion and the weakened portion; A retractable portion and a pointed neck portion are dimensioned to pass through the hole in the rivet head, and when the main body of the lock pin extends beyond the hole open at the blind end of the shank portion, the retractable portion is sized to pass through the hole in the rivet head. A rivet assembly adapted to extend from a hole passing through the rivet assembly. (2) The expanding skirt portion consists of a base portion connected to the main body portion, an open end portion on the opposite side of the base portion, and an enlarged diameter portion between the two, and the wall of the skirt portion has an arm-shaped cross section. 2. A rivet assembly according to claim 1, wherein the rivet assembly has a diameter of the base portion and the open end portion is smaller than the diameter of the enlarged diameter portion. (3) The enlarged diameter portion forms an annular raised portion, the raised portion and the cylindrical shank portion are sufficiently deformable, and the lock pin extends in the axial direction from the front surface of the processed piece. When the retractable part of the shank is pulled into the shank, the blind end of the shank gradually stretches and expands radially outward until it has a larger diameter than the hole in the workpiece. the workpiece is swaged between the rivet head and the expanded shank, while the ridge on the locking pin is progressively pressurized and drawn to a size small enough to fit within the shank; 4. A rivet assembly according to claim 3, wherein the wall thickness of the open end of the rivet is smaller than the wall thickness of the open end of the rivet assembly. (5) the front portion of the rivet head has a section around the hole, the pan has a volume sufficient to accommodate the volume of the expanding skirt material; said skirt portion extending radially outwardly of the diameter of the nucleation when expanded outwardly and sufficiently axially compressed to form a peripheral rim around said juncture of the locking pin neck and body; 5. The rivet assembly of claim 4, wherein the locking pin neck near the weakened portion has a larger diameter than the remaining portion of the neck. (6) a plurality of locking rings are spaced apart along said body between a neck joint and a blind end of said body, further including a plurality of peripheral grooves around said body; each locking ring; 6. The rivet assembly of claim 5, further comprising one groove near the blind side of the rivet, and each of the locking rings having an outer diameter larger than the hole diameter of the shank. (7) The outer diameter of each locking ring is
(8) The rivet assembly of claim 6, wherein each locking ring is substantially When the deformable locking pin is retracted into the shank portion, the locking ring is gradually tensioned and compressed to a size that fits within the shank;
7. The rivet assembly of claim 6, wherein the deformed material of the ring is compressed into the adjacent groove. (9) At least one locking ring has a groove near the front side, and the at least one locking ring is inclined rearward from the pin body at an angle between about 15° and 45° with respect to the horizontal. 9. A rivet assembly as claimed in claim 8 having a front surface. (10) 711] A bellows 1 assembly suitable for fixing from the front side of the workpiece through a hole in the workpiece without approaching the blind side of the workpiece. a head larger than the hole and axially extending through the nucleation such that the blind end projects through the nucleation and beyond the blind side of the workpiece when the head engages the top surface of the workpiece. an elongated rivet having a shank portion dimensioned to be inserted therein and having a common bore extending axially through both portions; A locking pin having a main body portion and an elongated neck portion located between the two portions, and a weakened portion formed at the joint between the neck portion and the main body portion, is used to prevent damage when excessive axial torsion is applied. an elongated, integrally formed locking pin whose neck is separated from the body portion at the joint portion; a locking ring; a hollow expanding skirt portion that connects the base to the main body near the joint with the neck and surrounds the neck near the joint between the main body and the neck;
the skirt is retracted from the neck to provide an annular space between the skirt and the neck, the retracted portion and the neck are sized to pass through holes in the rivets; When the main body of the locking pin extends beyond the hole opening at the blind end of the shank portion, the retracting portion extends from the hole passing through the rivet head portion, and the plurality of locking rings are attached to the neck portion. spaced apart between the joint and a blind end of the body and further including a plurality of circumferential grooves around the body, one groove near the blind side of each locking ring; has an outer diameter greater than the bore diameter of the shank portion, and the at least one locking ring has a front surface inclined rearwardly from the pin body at an angle between about 15° and 45° with respect to the horizontal. 11. The rivet assembly according to claim 10, wherein the outer diameter of each locking ring is smaller than the diameter of the widest part of the expansion skirt. (12) If each locking ring is sufficiently deformable and the block pin is drawn into the shank by axially drawing the retracting portion beyond the front side of the workpiece, the A rivet assembly as claimed in claim 1O, wherein the rivet assembly is progressively retracted and compressed to fit within the shank, compressing the deformed material of the ring into the adjacent groove. (13) At least one locking ring is approximately 1.
13. The rivet assembly of claim 12 having a rear surface angled forwardly from the body of the pin at an angle of up to 5 degrees. 14. The rivet assembly of claim 13, wherein said rear surface slopes forward at an angle of about 2 DEG to 8 DEG from horizontal.