JPH09291924A - Fastening mechanism with lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening mechanism with a lock to prevent loosening and falling of a bolt for fastening structure members together. SOLUTION: A fixing member 12 and structure members 3 and 4 are overlapped with each other and the screw part 10c of a blank bolt 10 is mounted in a screwed-in state on the screw hole 4a of the structure member 4 and fastened thereto for integral formation. An engaging groove is axially formed in the outer peripheral surface of the blank part 10b of the blank bolt 10, Meanwhile, A protrusion piece and an escape hole for the protrusion piece are formed in the inner wall surface of the through-hole 12a of the fixing member 12. Further, the fixing member 12 is securely welded to the structure member 3. In which case, a protrusion piece is engaged with the engaging groove and rotation in the direction in which the fastening force of the blank bolt 10 is weakened is blocked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening mechanism having a function of preventing or suppressing loosening or dropping of a screw due to vibration or the like.

[0002]

2. Description of the Related Art FIG. 7 is a block diagram showing an example of a conventional fastening mechanism. In the figure, 3 is a structural member to be fastened having a through hole 3a, 4 is a structural member having a bolt hole 4a, 6 is a bolt, 7 is a spring washer, and 8 is a washer.

Next, the conventional fastening mechanism will be described. The structural members 3 and 4 are overlapped with each other by aligning the hole positions of the through hole 3a and the bolt hole 4a. Then, the bolt 6 having the spring washer 7 and the washer 8 mounted therein is screwed into the bolt hole 4a through the through hole 3a. Then, the bolt 6 is tightened with an overload. At this time, elastic energy is accumulated in the spring washer 7 and a restoring force is generated in the spring washer 7. Due to this restoring force, the threads of the bolt 6 and the bolt hole 4a of the structural member 4 exert pressure on the other threads, and the frictional force at the thread contact surface increases. The frictional force suppresses the movement of the bolt 6 in the loosening direction.

FIG. 8 is a block diagram showing another example of a conventional fastening mechanism. In this prior art, as shown in FIG. 8, a bolt 6 with a washer 8 is screwed into a bolt hole 4a through a through hole 3a, tightened with an overload, and then an adhesive 9 is applied. The adhesive 9 permeates into the gap between the bolt 6 and the washer 8, the gap between the washer 8 and the structural member 3, the gap between the bolt 6 and the through hole 3a and the bolt hole 4a, and the gap between the structural members 3 and 4. Then, the bolt 6 is hardened to suppress the movement of the bolt 6 in the loosening direction.

In the above-mentioned prior art, the fastening between the bolt 6 and the bolt hole 4a is described, but the same is true for the fastening between the screw and the screw hole.

[0006]

Since the conventional fastening mechanism is constructed as described above, there is a problem that the bolt 6 is loosened or comes off due to strong vibration or continuous impact. there were.

The present invention has been made to solve the above problems, and is provided with a mechanism for suppressing or preventing the rotation of bolts and screws in the loosening direction, and suppressing the occurrence of loosening and falling of the bolts and screws. The purpose is to obtain a fastening mechanism with a lock.

[0008]

A fastening mechanism with a lock according to the first aspect of the present invention is a blank bolt having a head portion, a blank portion and a screw portion, and an engaging groove provided on an outer peripheral surface of the blank portion. And has a through hole in which the blank part is loosely fitted,
A projecting piece made of an elastic member that engages with the engaging groove is provided on the inner wall surface of the through hole so as to project in the tightening rotation direction of the blank bolt, and an escape hole for accommodating the projecting piece is provided on the inner wall surface of the through hole. The fixing member formed is provided with a screwing member that is screwed to the threaded portion of the blank bolt, the fixing member is integrally connected to at least one structural member on one side, and the blank bolt penetrates the fixing member. At least two structural members are inserted through the holes, the screwing members are screwed to the threaded portions of the blank bolts, the structural members are fastened and integrated with each other, and
The engagement groove and the protruding piece are engaged with each other to prevent the blank bolt from rotating in the fastening release direction.

In the locking mechanism according to the second aspect of the present invention, in the first aspect of the present invention, the screw hole to be screwed into the thread portion of the blank bolt is a structural member on the other side of at least two structural members. And the structural member also functions as a screw member.

In the fastening mechanism with lock according to the third aspect of the present invention, in the first or second aspect of the invention, the protruding piece insertion hole is provided so as to penetrate from the outer peripheral surface of the fixing member to the inner peripheral surface of the through hole. The projecting piece is inserted into the projecting piece insertion hole so as to project from the inner peripheral surface of the through hole in the tightening rotation direction of the blank bolt.

A fastening mechanism with a lock according to the fourth aspect of the present invention has a head portion, a blank portion and a screw portion, and a blank bolt having an engaging groove provided on an outer peripheral surface of the screw portion, and a screw portion. A projecting piece, which has a bolt hole to be attached, is formed on the inner wall surface of the bolt hole and is formed of an elastic member that engages with the engaging groove in the tightening rotation direction of the blank bolt, and the inner wall surface of the bolt hole is formed. And a nut formed with an escape hole for accommodating the protruding piece, the blank bolt is inserted through at least two structural members, the nut is screwed to the threaded portion of the blank bolt, and the structural members are integrally fastened together. In addition, the engagement groove and the protruding piece engage with each other to prevent the blank bolt from rotating in the fastening release direction.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1. 1 is a partially cutaway side view showing a locking mechanism according to Embodiment 1 of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 7 and FIG. The same or corresponding parts as those of the conventional fastening mechanism are designated by the same reference numerals, and the description thereof will be omitted. In the figure, 10
Is a blank bolt including a head portion 10a, a blank portion 10b, and a screw portion 10c.
On the outer peripheral surface of the blank portion 10b, there are formed three engagement grooves 11 extending in the axial direction at an equal angular pitch in the circumferential direction. 1
Reference numeral 2 denotes a fixing member having a through hole 12a formed therein which is loosely fitted in the blank portion 10b of the blank bolt 10. The inner wall surface of the through hole 12a of the fixing member 12 has three circumferentially equiangular pitches. The protruding piece 13 is formed, and the protruding piece 13 is further formed.
An escape hole 14 is formed corresponding to each protruding piece 13. Reference numeral 5 is a welded portion for fixing the fixing member 12 to the structural member 3. The protruding piece 13 is made of an elastic member.
Further, the outer diameter of the blank portion 10b is formed to be larger than the outer diameter of the screw portion 10c.

Here, the shapes of the projecting piece 13 and the engaging groove 11 will be described. The protruding piece 13 is the blank bolt 10.
Through hole 12a in the tightening rotation direction (indicated by A in FIG. 2)
Is provided so as to gradually separate from the inner wall surface of the. Further, the engagement groove 11 is formed in a V shape so as to gradually bite from the outer wall surface of the blank portion 10b in the tightening rotation direction A of the blank bolt 10.

Next, the operation of the first embodiment will be described. The fixing member 12 is superposed on the structural member 3 with the through holes 3a and 12a aligned with the center of the holes, and both are welded to be integrated. Then, the structural members 3 and 4 are overlapped with each other by aligning the hole positions of the through hole 3a and the bolt hole 4a. Then, the threaded portion 10c of the blank bolt 10 is inserted into the through hole 3a,
It is screwed into the bolt hole 4a of the structural member 4 through 12a.
Then, a wrench (not shown) or the like is fitted to the head portion 10a of the blank bolt 10 and tightened with an overload. When the blank bolt 10 rotates in the rotation direction A, the protruding piece 13
3 is pressed against the outer peripheral surface of the blank portion 10b and retracted into the escape hole 14, as shown in FIG. Then, when the engaging groove 11 reaches the position facing the projecting piece 13, the projecting piece 13 releases the pressing of the blank portion 10b, and as shown in FIG. To do. Retraction of the protruding piece 13 to the escape hole 14 and engagement groove 1
By repeating the protrusion to 1, the blank bolt 10 is tightened. Then, by the final tightening, the protruding piece 13 is engaged with the engaging groove 11, and the tightening is completed. At this time, the rotational force of the blank bolt 10 in the direction opposite to the rotational direction A is received by the protruding piece 13 that engages with the engaging groove 11, and the fixing member 12 to which the protruding side 13 is fixed is rotated together. To work. On the other hand, since the fixing member 12 is welded to the structural member 3, the rotation direction A of the blank bolt 10 is
And rotation in the opposite direction is blocked. That is, the blank bolt 10 is prevented from rotating in the direction of loosening the tightening force.

As described above, according to the first embodiment,
An engaging groove 11 is provided on the outer peripheral surface of the blank portion 10b of the blank bolt 10 in the axial direction, and the engaging groove 11 is provided on the inner wall surface of the through hole 12a of the fixing member 12 loosely fitted to the blank portion 10b of the blank bolt 10. The protruding piece 13 and the protruding piece 13 that engage with each other
Is provided with a clearance hole 14 for retreating, and the structural member 4 is provided with a bolt hole 4a, the fixing member 12 is welded and connected to the structural member 3, and the blank bolt 10 is passed through the through hole 12a of the fixing member 12. The structural members 3 and 4 are passed through the structural members 3 and 4, and the screw portion 10c is screwed into the bolt hole 4a to fasten and integrate the structural members 3 and 4 together. Therefore, the blank bolt 1 in the fastening release direction
The rotation of 0 is blocked by the engagement between the engaging groove 11 and the protruding piece 13. Therefore, a fastening mechanism with a lock can be obtained that can prevent the blank bolt 10 from loosening or falling off even if strong vibration or continuous impact is applied. Further, since the structural member 4 is provided with the bolt holes 4a, the blank bolt 1
The screw portion 10c of 0 is screwed into the bolt hole 4a for fastening, and a screwing member such as a nut is not required, so that the components can be simplified.

Embodiment 2 In the first embodiment, the bolt hole 4a into which the screw portion 10c of the blank bolt 10 is screwed is provided in the structural member 4. However, the bolt hole 4a of the structural member 4 is a through hole, and the screw portion 10c has a nut. The structural members 3 and 4 may be fastened and integrated by screwing. In this case, the same effect as that of the first embodiment can be obtained except that a nut is required as the screwing member.

Embodiment 3 In the first embodiment, the fixing member 12 and the structural member 3 are integrated by welding, but in the third embodiment, as shown in FIG. 4, the fixing member 12 and the structural member 3 are continuous. Insertion hole 1
5a and 15b are provided, the pin 16 is inserted, and the fixing member 12
And the structural member 3 are integrated. In the first embodiment, when the fastening of the structural members 3 and 4 that have been fastened once is released, the welded portion 5 needs to be removed, and the work of releasing the fastening is complicated. However, according to the third embodiment, by pulling out the pin 16, the connection between the fixing member 12 and the structural member 3 is released, and the fastening between the structural members 3 and 4 can be easily released.

Embodiment 4 In the fourth embodiment, as shown in FIG. 5, the through hole 12 is formed from the outer peripheral surface of the fixing member 12.
A protruding piece insertion hole 17 is provided so as to penetrate the inner peripheral surface of a, and the protruding piece 13 is inserted into the protruding piece insertion hole 17 so as to protrude from the inner peripheral surface of the through hole 12a in the tightening rotation direction of the blank bolt 10. Has been done. The other configuration is the same as that of the first embodiment. Here, the engagement groove 11
The engagement of the projecting piece 13 with the projecting piece 13 prevents the blank bolt 10 from rotating in the fastening release direction. When the rotational force in the direction of releasing the fastening of the blank bolt 10 exceeds the pressure input to the projecting piece insertion hole 17 of the projecting piece 13, the rear end of the projecting piece 13 is aligned with the outer peripheral surface of the fixing member 12, A fastening band (not shown) may be attached from the outside so as to prevent the protruding piece 13 from protruding from the protruding piece insertion hole 17. According to the fourth embodiment, the protruding piece 13 is inserted into the protruding piece insertion hole 1
By pulling out from 7, the engagement between the engagement groove 11 and the protruding piece 13 is released, and the fastening of the structural members 3 and 4 can be easily released.

Embodiment 5 In the first embodiment, the protruding piece 13 is formed integrally with the fixing member 12, but in the fifth embodiment, as shown in FIG.
The protruding piece installation groove 18 is provided on the inner wall surface 12a of the fixing member 12 so as to be connected to the escape hole 14, and the protruding piece 13 bent in a dogleg shape is installed in the protruding piece installation groove 18, and the same effect is obtained. can get.

Embodiment 6 In the second embodiment described above, the fixing member 12 is provided with the projecting piece 13 and the blank portion 10b of the blank bolt 10 is provided with the engaging groove 11, but in the sixth embodiment, the nut is provided with the projecting piece. An engagement groove is provided in the screw portion 10c of the blank bolt 10. The shapes of the protruding piece and the engaging groove are the same as those in the second embodiment. In this case, the structural members 3 and 4 are fastened by the blank bolt 10 and the nut, and the loosening of the fastening of the blank bolt 10 and the nut is prevented by the engagement between the protruding piece and the engaging groove. Therefore, the fixing member 12 becomes unnecessary, and welding work between the fixing member 12 and the structural member 3 becomes unnecessary.

In each of the above embodiments, the engaging groove 11
It is assumed that the same number of the engaging grooves 11 and the protruding pieces 13 are provided, but it is not always necessary to provide the same number of the engaging grooves 11 and the protruding pieces 13. The fixed member 12 may be provided with one protruding piece 13. Further, in the above-described embodiment, the elastic member is used as the protruding piece 13, but a spring member is contracted between the protruding piece 13 and the escape hole 14 to move the protruding piece 13 into the protrusion and the escape hole 14. May be saved.

[0022]

Since the present invention is configured as described above, it has the following effects.

According to the first aspect of the invention, the blank bolt has the head portion, the blank portion and the screw portion, and the engaging groove is provided on the outer peripheral surface of the blank portion, and the penetrating through which the blank portion is loosely fitted. A projecting piece having a hole and made of an elastic member that engages with the engaging groove is provided on the inner wall surface of the through hole so as to project in the tightening rotation direction of the blank bolt, and the projecting piece is provided on the inner wall surface of the through hole. The blank bolt is provided with a fixing member having an escape hole formed therein and a screwing member that is screwed into a threaded portion of the blank bolt, and the fixing member is integrally connected to a structural member on one side of at least two structural members. Is inserted through at least two structural members through the through holes of the fixing member, the screwing member is screwed to the threaded portion of the blank bolt, the structural members are fastened and integrated, and the engaging groove and the protruding piece are formed. Are engaged and the blank bolt The rotation of the is blocked, even if applied strong vibrations or continuous impact, blank bolts 10
A fastening mechanism with a lock can be obtained that can prevent the loosening and falling of the material.

According to the second aspect of the present invention, in the first aspect of the invention, the screw hole to be screwed into the thread portion of the blank bolt is provided in the other structural member of at least two structural members, Since the structural member also serves as a screwing member,
The configuration can be simplified.

According to the third aspect of the present invention, in the first or second aspect of the invention, the protruding piece insertion hole is provided so as to penetrate from the outer peripheral surface of the fixing member to the inner peripheral surface of the through hole. Since it is inserted into the protruding piece insertion hole and protrudes from the inner peripheral surface of the through hole in the tightening rotation direction of the blank bolt, the fastening of the structural members can be easily released.

According to the fourth aspect of the invention, the blank bolt has the head portion, the blank portion and the screw portion, and the engaging groove is provided on the outer peripheral surface of the screw portion, and the bolt to which the screw portion is screwed. A projecting piece having a hole and made of an elastic member that engages with the engaging groove is provided on the inner wall surface of the bolt hole so as to project in the tightening rotation direction of the blank bolt, and the projecting piece is provided on the inner wall surface of the bolt hole. And a nut formed with an escape hole for accommodating, a blank bolt is inserted through at least two structural members, the nut is screwed to a threaded portion of the blank bolt, the structural members are fastened and integrated with each other, and the engagement is performed. Since the groove and the projecting piece are engaged with each other and the rotation of the blank bolt in the fastening release direction is blocked, it is possible to prevent the blank bolt 10 from loosening or coming off even if strong vibration or continuous impact is applied. In addition, the configuration is simplified Per fastening mechanism can be obtained.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a fastening mechanism with a lock according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a cross-sectional view illustrating a fastening operation of the fastening mechanism with a lock according to the first embodiment of the present invention.

FIG. 4 is a partially cutaway side view showing a fastening mechanism with a lock according to a third embodiment of the present invention.

FIG. 5 is a sectional view showing a fastening mechanism with a lock according to a fourth embodiment of the present invention.

FIG. 6 is a sectional view showing a fastening mechanism with a lock according to a fifth embodiment of the present invention.

FIG. 7 is a configuration diagram showing an example of a conventional fastening mechanism.

FIG. 8 is a configuration diagram showing another example of a conventional fastening mechanism.

[Explanation of symbols]

3 structural members, 4 structural members (screw members), 4a screw holes, 5 welded parts, 10 blank bolts, 10a head part,
10b blank part, 10c screw part, 11 engaging groove, 1
2 fixing member, 12a through hole, 13 protruding piece, 14
Escape hole, 17 protruding piece insertion hole.

Claims (4)

[Claims] 1. A head part, a blank part and a screw part,
A blank bolt having an engagement groove provided on an outer peripheral surface of the blank portion, and a through hole into which the blank portion is loosely fitted, and an elastic member engaging with the engagement groove on an inner wall surface of the through hole. A projecting piece that protrudes in the tightening rotation direction of the blank bolt, and a fixing member having an escape hole for accommodating the projecting piece formed in the inner wall surface of the through hole, and screwed to the screw part of the blank bolt. The fixing member is integrally connected to a structural member on one side of at least two structural members, and the blank bolt is inserted through the through hole of the fixing member to insert the at least two structural members. The screw member is screwed to the threaded portion of the blank bolt to integrally fasten the structural members, and the engaging groove and the projecting piece engage with each other in the blank in the fastening release direction. The rotation of the bolt is blocked A fastening mechanism with a lock, which is characterized in that 2. A screw hole to be screwed into a screw portion of a blank bolt is provided in a structural member on the other side of at least two structural members, and the structural member also serves as a screwing member. The fastening mechanism with a lock according to claim 1. 3. A protruding piece insertion hole is provided so as to penetrate from the outer peripheral surface of the fixing member to the inner peripheral surface of the through hole, and the protruding piece is inserted into the protruding piece insertion hole so as to be blank from the inner peripheral surface of the through hole. The fastening mechanism with a lock according to claim 1 or 2, wherein the fastening mechanism is provided so as to project in the tightening rotation direction of the bolt. 4. A head portion, a blank portion and a screw portion,
A blank bolt having an engagement groove provided on an outer peripheral surface of the threaded portion, and a bolt hole into which the threaded portion is screwed, and an elastic member engaging with the engagement groove on an inner wall surface of the bolt hole. And a nut having an escape hole for accommodating the projecting piece formed on the inner wall surface of the bolt hole, the projecting piece being formed to project in the tightening rotation direction of the blank bolt, and the blank bolt having at least two structures. The member is inserted, the nut is screwed to the threaded portion of the blank bolt, the structural members are fastened and integrated, and the engaging groove and the protruding piece are engaged with each other in the fastening release direction. A fastening mechanism with a lock, characterized in that the blank bolt is prevented from rotating.