TWI875052B - Fastening device - Google Patents

Abstract

A fastening device includes a first fastener and a second fastener. The first fastener includes a first barrel head and a first barrel body connected to each other. The second fastener includes a second barrel head and a second barrel body connected to each other. The second barrel head is inserted into the first barrel body and cooperates with the second barrel body to form an internal thread. The second barrel body abuts the first barrel body and can squeeze the first fastener to deform the first barrel body of the first fastener. The invention innovatively adopts a two-piece design in which the first fastener and the second fastener cooperate, which can provide the industry with more choices different from existing products and promote healthy competitive development of the industry.

Description

Fastening device

The present invention relates to a device for fastening or fixing a component or machine part, and in particular to a fastening device suitable for screwing a workpiece with a thread.

Referring to FIGS. 1 to 3 , Patent Publication No. M338296 discloses a conventional fastening device, including a fastener 11 and a bottom plug 12 screwed on the bottom of the fastener 11. The fastener 11 includes a first tube 13 and a second tube 14 which are hollow cylindrical and integrally connected to each other.

The outer surface of the first barrel portion 13 is formed with a texture structure 131. The texture structure 131 includes a plurality of grooves 132 extending in the axial direction and spaced apart from each other in the radial direction. The first barrel portion 13 is formed with a radially outwardly extending flange 133 at one end opposite to the second barrel portion 14. The inner surface of the second barrel portion 14 is formed with an internal thread suitable for being screwed with a bolt 15.

The conventional fastening device is used as follows: the fastening device is inserted into a hole 161 of a plate 16 along an insertion direction D11, and a starter is used to drive the bolt 15 to rotate. At this time, since the flange 133 abuts against the target object, the fastening device cannot continue to move along the insertion direction D11. Therefore, when the bolt 15 continues to rotate and further inserts into the second barrel 14, the second barrel 14 will move in a direction opposite to the insertion direction D11, that is, the second barrel 14 will move toward the first barrel 13, thereby squeezing the first barrel 13. At this time, since the first tube portion 13 has a thinner wall and is formed with the texture structure 131, it is relatively fragile in structure. Therefore, the first tube portion 13 will be squeezed and deformed by the second tube portion 14, thereby cooperating with the flange 133 to clamp the plate 16 and position the fastening device on the plate 16.

Although this existing fastening device can create a connection point for the bolt 15 to be set on the plate 16 without a screw hole for further setting screws of other components, another design different from the existing products is still to be provided to allow industry consumers to have more choices and promote industrial competition and development.

The purpose of the present invention is to improve at least one disadvantage of the prior art.

The fastening device of the present invention comprises a first fastener and a second fastener.

The first fastener comprises a first barrel head and a first barrel body connected to each other. The second fastener comprises a second barrel head and a second barrel body connected to each other. The second barrel head is inserted into the first barrel body and cooperates with the second barrel body to form an internal thread. The second barrel body abuts against the first barrel body and can squeeze the first fastener to deform the first barrel body of the first fastener. The second barrel head is spaced up and down from the first barrel head and cooperates with the first barrel head and the first barrel body to define a spacing space.

The utility of the present invention is that the innovative two-piece design of the first fastener and the second fastener can provide the industry with more choices different from existing products and promote healthy competition and development of the industry.

In the following description, similar or identical components will be denoted by the same reference numerals.

4, 5 and 6, a first embodiment of the fastening device of the present invention is suitable for use with a nut 21 having anti-slip/anti-loosening function and a bolt 22.

The first embodiment includes a first fastener 3 and a second fastener 4 which can be separably and coaxially sleeved and assembled together.

The first fastener 3 includes a first barrel head portion 31 and a first barrel body portion 32 which are integrally connected to each other, and a texture structure 33 formed on the outer surface of the first barrel body portion 32.

A first wall thickness 311 of the first barrel head portion 31 is greater than a second wall thickness 321 of the first barrel body portion 32, and because the outer surface of the first barrel head portion 31 is coplanar with the outer surface of the first barrel body portion 32, a first barrel head inner diameter 312 of the first barrel head portion 31 is smaller than a first barrel body inner diameter 322 of the first barrel body portion 32. The end of the first barrel head portion 31 opposite to the first barrel body portion 32 is not formed with a radially outwardly protruding edge, or in other words, the outer surface of the first barrel head portion 31 is a flat cylindrical surface without an annular protrusion structure.

The second fastener 4 is inserted into the inner side of the first barrel portion 32. An inner surface 324 of the first barrel portion 32 and an inner surface 313 of the first barrel head portion 31 are not formed with threads, but are respectively flat cylindrical surfaces.

The texture structure 33 includes a plurality of grooves 331 formed on the outer surface of the first barrel portion 32. The grooves 331 are arranged at intervals along the arc direction, and each groove 331 extends in the axial direction, and the extension length is about half of the axial length of the first fastener 3. The texture structure 33 can produce an anti-slip effect.

The second fastener 4 includes a second barrel head portion 41 and a second barrel body portion 42 integrally connected to each other, and a drill head portion 43 integrally connected to the second barrel body portion 42.

A second barrel head outer diameter 411 of the second barrel head portion 41 is smaller than a second barrel body outer diameter 421 of the second barrel body portion 42. Since the outer diameter of the second barrel head portion 41 is smaller, the second barrel head portion 41 can be inserted into the first barrel body portion 32, and the outer surface of the first barrel body portion 32 roughly corresponds to the outer surface of the second barrel body portion 42 in the radial direction. The second barrel head portion 41 is spaced up and down from the first barrel head portion 31, and cooperates with the first barrel head portion 31 and the first barrel body portion 32 to define a spacing space S1.

The top end of the second barrel portion 42 abuts against the bottom end of the first barrel portion 32, and the second barrel portion 42 cooperates with the second barrel head portion 41 to form an internal thread 44 suitable for threading the bolt 22. The thread valley of the internal thread 44 is aligned with the inner surface 313 of the first barrel head portion 31.

The drill head portion 43 and the second barrel head portion 41 are respectively located at two opposite ends of the second barrel body portion 42, and can be used by the first embodiment to drill into a target object 23 (see FIG. 6 ).

Referring to Figures 5, 6, and 7, when the first embodiment is used, the nut 21 and the bolt 22 are assembled together as shown in Figure 6, and a hand-operated machine (not shown) drives the second fastener 4 to rotate through the bolt 22, so that the second fastener 4 can be driven into the target object 23. In the first embodiment, the target object 23 is wood, but in other embodiments of the present invention, the material of the target object 23 can also be cement or metal, without special limitation.

When the second fastener 4 penetrates into the target object 23 until the nut 21 abuts against the target object 23, the nut 21 can be fixed by a fixing tool (not shown, such as a wrench), and then the screwdriver is continued to drive the bolt 22 to rotate. At this time, due to the limitation of the nut 21, the bolt 22 can no longer drive the first embodiment as a whole to penetrate deeper into the target object 23, but the bolt 22 will still be further screwed into the second fastener 4 under the action of the thread. In this way, the bolt 22 can only be further screwed into the second fastener 4 when the second fastener 4 moves toward the first fastener 3. In the process of the second fastener 4 moving toward the first fastener 3, the second barrel portion 42 will squeeze the first fastener 3, so that the thinner portion of the first fastener 3 (i.e., the first barrel portion 32) is bent and deformed into a ring-shaped structure as shown in FIG7 and stuck in the target object 23, and the second barrel head portion 41 is changed from a first position as shown in FIG6 to a second position as shown in FIG7. In the first position, the second barrel head portion 41 is spaced up and down from the first barrel head portion 31, and cooperates with the first barrel head portion 31 and the first barrel portion 32 to define a spacing space S1. In the second position, the top end of the second barrel head portion 41 abuts against the bottom end of the first barrel head portion 31. Since in this first embodiment, the target object 23 is wood, the deformation degree of the first barrel portion 32 is more complete. In other embodiments of the present invention, if the target object 23 is harder metal or cement, the deformation degree of the first barrel portion 32 will be smaller, but it can still be stuck in the target object 23.

5, 7, and 8, after the first embodiment is successfully inserted into the target object 23, the bolt 22 and the nut 21 are screwed off relative to the first embodiment. The first embodiment is like a screw hole seat embedded in the target object 23, which allows other objects to be installed to be screwed together with the target object 23 through other screw fastening elements, which is quite convenient. Among them, the advantage of the first barrel head portion 31 having a thicker first wall thickness 311 and a smaller first barrel head inner diameter 312 is that when the second barrel head portion 41 is located at the second position and can be used for other screw fastening elements, such as other types of bolts to be inserted, it can ensure that the first barrel head portion 31 abuts against the screw fastening element to prevent the screw fastening element from shaking relative to the first fastener 3, thereby reducing the probability of the first embodiment loosening relative to the target object 23 due to shaking.

Referring to FIG. 9 , a second embodiment of the fastening device of the present invention is similar to the first embodiment, except that the first barrel portion 32 includes a first annular surface 323 located at the bottom and abutting the second barrel portion 42. The first annular surface 323 is radially inclined inward toward the second barrel portion 42. The second barrel portion 42 includes a second annular surface 423 located at the top and abutting the first barrel portion 32. The second annular surface 423 is radially inclined inward toward a direction away from the first barrel portion 32.

The feature of the second embodiment is that, through the cooperation between the first annular surface 323 and the second annular surface 423, in the process that the second fastener 4 squeezes the first fastener 3 to deform the first barrel portion 32 of the first fastener 3, the second fastener 4 is not easily displaced horizontally to the left and right relative to the first fastener 3, so that the second fastener 4 can squeeze the first fastener 3 more accurately.

Referring to FIG. 10 , a third embodiment of the fastening device of the present invention is similar to the first embodiment, except that the length of the drill head portion 43 of the second fastener 4 is lengthened, thereby optimizing the effect of removing waste chips during drilling and improving the self-drilling efficiency.

Referring to FIG. 11 , the fourth embodiment of the present invention is similar to the first embodiment, except that the second fastener 4 omits the drill head portion 43 (see FIG. 5 ). The fourth embodiment is applicable to objects with holes pre-drilled, and since there is no need to drill holes by self-drilling, the drill head portion 43 can be omitted.

In summary, the utility of the fastening device of the present invention is that the innovative two-piece design of the first fastener 3 and the second fastener 4 can provide the industry with more choices different from existing products and promote healthy competition and development of the industry.

The above is only an embodiment of the present invention, and cannot be used to limit the scope of the patent application of the present invention. In addition, simple equivalent changes and modifications according to the scope of the patent application of the present invention and the patent specification should also be covered by the scope of the patent application of the present invention.

21: Nut 22: Bolt 23: Target object 3: First fastener 31: First barrel head 311: First wall thickness 312: First barrel head inner diameter 313: Inner surface 32: First barrel body 321: Second wall thickness 322: First barrel body inner diameter 323: First annular surface 324: Inner surface 33: Texture structure 331: Groove 4: Second fastener 41: Second barrel head 411: Second barrel head outer diameter 42: Second barrel body 421: Second barrel body outer diameter 423: Second annular surface 43: Drill head 44: Inner thread S1: Spacing space

Other features and effects of the present invention will be clearly presented in the implementation method with reference to the drawings, in which: Figure 1 is a three-dimensional diagram illustrating an existing fastening device; Figure 2 is a partially cut-away cross-sectional view illustrating the existing fastening device used in conjunction with a plate; Figure 3 is a cross-sectional view illustrating a deformation of the existing fastening device; Figure 4 is a three-dimensional exploded view illustrating a first embodiment of the fastening device of the present invention and a nut and a bolt suitable for use with the first embodiment; Figure 5 is a partially cut-away cross-sectional view illustrating the first embodiment; Figure 6 is a cross-sectional view illustrating the first embodiment being drilled into a target object; FIG. 7 is a cross-sectional view illustrating the use process of the first embodiment, and a first barrel portion of a first fastener of the first embodiment is deformed; FIG. 8 is a cross-sectional view illustrating that the nut and the bolt are removed and the first embodiment remains in the target object; FIG. 9 is a partially cut cross-sectional view illustrating a second embodiment of the fastening device of the present invention; FIG. 10 is a partially cut cross-sectional view illustrating a third embodiment of the fastening device of the present invention; and FIG. 11 is a partially cut cross-sectional view illustrating a fourth embodiment of the fastening device of the present invention.

3: First fastener

31: The first tube head

311: First wall thickness

312: Inner diameter of the first barrel head

32: First barrel

321: Second wall thickness

322: Inner diameter of the first barrel

4: Second fastener

41: Second tube head

411: Second barrel head outer diameter

42: Second barrel

421: Second barrel outer diameter

43: Drill head

44: Internal thread

Claims (6)

A fastening device is suitable for use with a screw fastening element, and comprises: a first fastener, comprising a first barrel head and a first barrel body connected to each other; and a second fastener, comprising a second barrel head and a second barrel body connected to each other, the second barrel head is inserted into the first barrel body, and cooperates with the second barrel body to form an internal thread, the second barrel body abuts against the first barrel body, and can squeeze the first fastener to deform the first barrel body of the first fastener; The second barrel head can be changed from a first position to a second position. In the first position, the second barrel head is spaced up and down from the first barrel head, and cooperates with the first barrel head and the first barrel body to define a space. In the second position, the top end of the second barrel head abuts against the bottom end of the first barrel head, and the first barrel head is suitable for abutting against the screw fastening element; Wherein, a first wall thickness of the first barrel head is greater than a second wall thickness of the first barrel body, and a first barrel head inner diameter of the first barrel head is smaller than a first barrel body inner diameter of the first barrel body, and an inner surface of the first barrel head is aligned with the thread valley of the internal thread. A fastening device as described in claim 1, wherein the first barrel portion includes a first annular surface abutting the second barrel portion, the first annular surface diameter is inclined inwardly toward the second barrel portion, and the second barrel portion includes a second annular surface abutting the first barrel portion, the second annular surface diameter is inclined inwardly away from the first barrel portion. A fastening device as described in claim 1, wherein the second fastener further includes a drill head portion connected to the second barrel portion and opposite to the second barrel head portion. A fastening device as described in any one of claims 1 to 3, wherein the first fastener further includes a texture structure formed on the outer surface of the first barrel portion. A fastening device as described in claim 1, wherein a second barrel head outer diameter of the second barrel head portion is smaller than a second barrel body outer diameter of the second barrel body portion. A fastening device as described in claim 1, wherein an end of the first barrel head portion opposite to the first barrel body portion does not have a radially outwardly protruding edge, and an inner surface of the first barrel head portion and an inner surface of the first barrel body portion do not have threads.

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