KR200208906Y1 - Bolt-Nut structure having self-locking function - Google Patents

Abstract

The present invention relates to a safety fastener (1) for preventing loosening consisting of a bolt (2) and a nut (3). Safety fastener 1 according to an aspect of the present invention is a bolt (2) having a bolt head portion (4) and a bolt body portion (5) and a nut (3) screwed to the bolt (2) The bolt main body 5 includes a first main body 6 having a screw thread in one direction, and a second main body 7 having a screw thread in a direction opposite to the first main body 6. Including; The nut (3) comprises a first nut portion (8) fastened to the first body portion (6) of the bolt (2); A second nut part 9 fastened to the second main body part 7 of the bolt 2; And a third nut portion 11 fastened to the end side length portion r of the second body portion 7 of the bolt 2. According to another aspect of the present invention, the same screw thread formed on the inner surface of the first nut portion 8 corresponding to the first body portion 6 is formed on the inner surface of the through hole 20 of the object to be fastened. It may have a simple configuration in which the first and second nut parts 8, 9 are excluded.

Description

Safety fastener for preventing loosening {Bolt-Nut structure having self-locking function}

The present invention relates to a fastening structure that is fastened by a screw thread formed on the surface of the bolt and nut, including the bolt and nut, more specifically, the thread formed on the bolt and nut is formed in one direction and the opposite direction The present invention relates to a safety fastener having a structure in which disassembly and a fastening work are artificially easy while external factors prevent unwinding of the fastening structure.

Generally, screws or bolts are used to fasten two or more objects, from large installations such as various machinery, transportation equipment, machine tools or roller coasters to household goods such as glasses, roller skates or roller blades. In the case of the bolt and nut, especially when the reverse rotation of the bolt or nut occurs due to vibration, for example, the tightening force of the bolt is lowered, which may cause unexpected accidents or disasters.

Accordingly, Korean Patent Application Publication Nos. 1983-2223, 1991-7342, 1999-220218, and Patent No. 220218 have various safety fastenings provided with auxiliary functions to prevent loosening or loosening of such bolt / nut fasteners. Che has been proposed, and there have been a number of other proposals. However, in spite of the various proposals mentioned above, the anti-loosening effect may not meet expectations, or the design thereof may be complicated, making the construction and construction of the fastening structure complicated and difficult, or in some cases, causing dismantling. come.

Therefore, the object of the present invention is that once fully fastened to the object to be fixed, the natural loosening phenomenon is completely prevented and can be easily dismantled by artificial manipulation, the structure is simple design and easy to manufacture and construction To provide a safety fastener.

In order to achieve the above object, the present inventors earnestly researched, in a fastening structure including a bolt and a nut, the fastening force of which is held by a screw thread formed on the outer surface of the bolt body portion and a screw thread formed on the inner surface of the nut, wherein An additional second thread is formed on the outer surface in the opposite direction to the thread, and a corresponding thread is formed on the inner surface of the corresponding second nut, thereby tightening them in opposite directions to prevent the loosening operation. It was confirmed that it is possible to completely prevent the loosening of the nut by providing a safety device, by integrally forming a screw thread on the outer surfaces of the nut and the second nut and tightening it with an additional third nut thereon. In addition, the fabrication, installation and dismantling of the structure is also made smoothly compared to the prior art It confirmed that it was the completion of the present invention;

1 is a cross-sectional view showing a state in which the bolt 2 of the safety fastener 1 according to an embodiment of the present invention is inserted into the object (a) to be fixed,

FIG. 2 shows a cross section and a side view of the first nut part 8 coupled to the first body part 6 of the bolt 2 constituting the safety fastener 1,

3 is a cross-sectional view and a side view of the second nut part 9 coupled to the second body part 7 of the bolt 2 constituting the safety fastener 1,

4 shows the first nut part 8 constituting the safety fastener 1, the second nut part 9, and the first side part of the second main body part 7 of the bolt 2. 3 is a side cross-sectional view of the nut portion 11,

5A, 5B, 5C and 5D respectively show a process of engaging the safety fastener 1 of the present invention in order, and FIG. 5A shows a state in which the bolt 2 is inserted into the object a, FIG. 5B illustrates a state in which the first nut 8 is coupled, FIG. 5C illustrates a state in which the second nut 9 is coupled, and FIG. 5D illustrates a state in which the third nut 11 is coupled. Illustrated section,

6A and 6B are respectively shown in the threaded portion of the inner wall of the through-hole of the object a to be fixed by the first body portion 21 of the bolt 2 of the safety fastener 1 according to the second embodiment of the present invention. Is a cross-sectional view showing a state in which the nut 23 is coupled to the fastened state and the second main body portion 22 of the inserted bolt 2,

7 is a cross-sectional view of the nut 23 used in the second embodiment of the present invention.

Description of the main symbols in the drawings

1: safety fastener 2: bolt

3: nut 4: bolt head

5: bolt main body 6: first main body

7: 2nd main body 8: 1st nut part

9: 2nd nut part 11: 3rd nut part

12: Washer 13: Driver Home

14: groove a: fixed object

p: length of nut r: length of protrusion of bolt

21: bolt first threaded portion 22: bolt second threaded portion

23: nut part

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

According to a preferred embodiment of the present invention, for example, a safety fastener for preventing release having a locking function which is not easily released by any external factors such as vibration is provided. The safety fastener of the present invention includes a bolt head part 4 and a bolt body. In the usual fastener consisting of a bolt (2) having a portion (5) and a nut (3) screwed to the bolt (2),

The bolt body portion 5 has a first body portion formed with a screw thread in one direction and having a first diameter smaller than that of the bolt head portion 4 (thickness + thickness of the object a to be fixed + p). 6) and a second main body 7 formed with a thread in a direction opposite to the first main body 6 and having a second diameter smaller than the first main body 6 and having a length of (p + r) 7. );

The nut 3 has an inner threaded portion of a first diameter fastened to a screw thread formed on an outer surface of the first body portion 6 of the bolt 2, and formed on the first body portion 6 on an outer surface thereof. A first nut part 8 having a thread line in a direction opposite to the thread line and having a longitudinal width p; The inner thread of the second diameter is fastened to the thread formed on the outer surface of the second body portion 7 of the bolt (2), and the outer surface of the bolt 2 in the same direction as the screw thread formed on the second body portion (7) A second nut part (9) formed so as to be integral with the first nut part (8) and having an outer thread line and having a longitudinal width p; And the outer thread of the first nut part 8 and the second nut part 9 and the bolt after the first nut part 8 and the second nut part 9 are fastened to the bolt 2. It consists of the 3rd nut part 11 which is simultaneously fastened to the screw thread formed in the outer side of the end side length part r of the 2nd main-body part 2 of 2), and is comprised so that loosening of a fastener can be prevented.

The washer 12 of the present invention may further include a washer 12 between the fixing object a and the bolt head 4 and / or between the fixing object a and the first nut 8. have.

In addition, in the safety fastener of the present invention, the closed end side surface of the third nut part 11 is formed in a rounded and convex shape, so that the third nut part 11 can be tightened or loosened so as to have a-or + shaped driver groove. 13 is formed in the said end side surface.

Grooves 14 are formed in the outer peripheral surfaces of the first nut part 8 and the second nut part 9 in the longitudinal direction to tighten the first nut part 8 and the second nut part 9, respectively. Alternatively, it is easy to loosen the work, and can be a reference for the alignment of the nut parts (8, 9).

The longitudinal lengths of the first nut part 8 and the second nut part are respectively p, and the length of the bolt body part that protrudes through the second nut part when engaged is r, and the first body part of the bolt is r. The outer surface of (6) and the direction of the screw thread formed in the inside of the first nut part 8 are all other threads, that is, the outer surface of the second main body part 7 of the bolt, the second nut part 9 Are formed on the inner surface of, the outer surfaces of the first and second nut parts 8 and 9, and the inner surfaces of the third nut part 11, respectively. In addition, the angle of formation of the threads in the same direction, that is, the angle φ with respect to the horizontal are all the same so that the coupling and disassembly can be made.

6a and 6b show an aspect according to another embodiment of the invention, according to the second aspect of the invention, a bolt having a bolt head portion 4 and a bolt body portion 5 In the bolt fastener consisting of (2) and the nut (3) screwed to the bolt (2),

The bolt body portion 5 is formed with a screw thread in one direction and has a first diameter smaller than that of the bolt head portion 4 and has a length equal to the thickness of the object a to be fixed so as to penetrate the object a. A bolt is formed in a direction opposite to a screw thread of the bolt first body portion 21 and the bolt first body portion 21 which is fastened to a screw thread formed on the inner wall of the ball, and is equal to or equal to the bolt first body portion 21. A bolt second body portion 22 having a small second diameter and formed to a length of r;

The nut 23 has an inner threaded portion that can be fastened to a screw thread formed on an outer surface of the bolt second body portion 22, and a portion corresponding to the end side of the bolt 2 body portion is closed,

The fastening prevention safety fastener 20 is provided, which is configured to prevent spontaneous loosening of the bolt 2 and the nut 3 and to facilitate an artificial dismantling operation.

The anti-seizure safety fastener 20 according to the second embodiment of the present invention is a modification of the anti-seizure safety fastener 1 according to the first embodiment of the present invention, and the configuration is much simplified, so that the first nut and Since the need for a second nut has been eliminated, it further has the advantage that the number of parts is reduced and the process labor required for manufacturing can be significantly reduced.

According to the present invention, once fastened to an object to be fixed, spontaneous loosening can be completely prevented and dismantling can be easily performed by artificial manipulation, and the structure is designed to be simple and easy to manufacture and construct. By providing a sieve, there is provided a safety fastener that can be used in fastenings of safety-critical structures, from large installations such as various machinery to small and medium sized household goods.

Claims (4)

In the bolt type fastener which consists of a bolt 2 provided with the bolt head part 4 and the bolt main-body part 5, and the nut 3 screwed to the said bolt 2, The bolt body portion 5 has a first main body portion 6 having a first diameter smaller than the bolt head portion 4 and having a threaded line in one direction, and in a direction opposite to the first body portion 6. A second body portion (7) formed with a screw thread and having a second diameter smaller than the first body portion (6); The nut 3 has an inner threaded portion of a first diameter fastened to a screw thread formed on an outer surface of the first body portion 6 of the bolt 2, and formed on the first body portion 6 on an outer surface thereof. A first nut part 8 in which threads are formed in a direction opposite to the threads; The inner thread of the second diameter is fastened to the thread formed on the outer surface of the second body portion 7 of the bolt (2), and the outer surface of the bolt 2 in the same direction as the screw thread formed on the second body portion (7) A second nut part (9) formed to be continuous with an outer thread so as to be integrated with the first nut part (8); And after the first nut part 8 and the second nut part 9 are fastened to the bolt 2, the outer surface threads of the first nut part 8 and the second nut part 9, and the bolt ( Safety fastener for preventing loosening, characterized in that the third nut portion (11) which is fastened at the same time to the thread line formed on the outer side of the end side length portion of the second body portion (7). The end face of the third nut part 11 is formed in a round and convex shape, and the -shaped or + -shaped driver groove 13 is provided to tighten or loosen the third nut part 11. Safety fastener for preventing loosening, characterized in that formed on the end surface. The method of claim 1, wherein one or more pairs of grooves 14 are formed in the outer peripheral surfaces of the first nut part 8 and the second nut part 9 in the longitudinal direction so that the first nut part 8 and the first nut part 8 are formed. 2 Safety fastener for preventing loosening, characterized in that to facilitate the tightening or loosening of each of the nut parts (9), and to be the reference of the alignment of the nut parts (8,9). A screw thread identical to the inner thread of the first nut part 8 is formed in the inner wall 21 of the through hole 20 of the fixing object a, and the first nut part 8 is excluded. Safety fasteners for preventing loosening, characterized in that.