JP6803632B1 - Anti-seizure fastener - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seizure prevention fastener in particular, which belongs to the technical field of a fastener. SOLUTION: The bolt 1 is composed of a nut 3 having a stopper and an accommodating groove, and two nuts of a nut 2 having a pressure receiving plate and a rotating block used adjacent to the bolt 1 and having a stopper and an accommodating groove. Even if the nut is seized, the nut having the pressure receiving plate and the rotating block is rotated, the pressure receiving plate is fitted into the accommodating groove, and a gap is created between the object to be fastened and the nut having the pressure receiving plate and the rotating block. An anti-seizure fastener characterized by releasing the fastening force stored in the tightening direction of the two nuts and making it easier to remove the two nuts from the bolts. [Selection diagram] Fig. 1

Description

The present invention relates to a seizure prevention fastener.

Today's bolt and nut fasteners have a very wide range of uses, and the demand for fastener performance is increasing, with a variety of high-performance fasteners such as high strength, tightening and loosening prevention, durability, and corrosion resistance. Ingredients are used.

Existing fasteners can generally meet the performance requirements of fastening by improving the mechanical properties of the material, but the seizure and bite of fasteners can be made of stainless steel, aluminum alloys, titanium alloys, etc. It is likely to occur with fasteners made of metal alloy.
Although metal alloys are corrosion resistant, damage to the surface creates a thin oxide layer to prevent further corrosion.

When the fasteners are fastened, the pressure and heat generated between the bolts and threads breaks and melts the intermediate oxide layer, and the threads (teeth) of the metal alloy are directly blocked or sheared and fused. Occurs, then seizure occurs.
Once complete seizure has occurred, it is difficult to remove the fasteners.

Therefore, conventionally, it has been required to pay attention to the following points in order to prevent seizure at the time of fastening.
(1) Before using the fastener, check whether the mechanical properties of the product, such as the tensile strength of the bolt and the guaranteed load of the nut, meet the usage requirements. Select the appropriate bolt length and set the pitch of the threads that pop out from the nut after tightening to 1-2.
(2) If the threads are rough or if there is iron powder or dirt in the thread grooves, these often lead to seizure, so check before using.
(3) Lubricate before using the fastener. Although it is desirable to use powders of butter, molybdenum disulfide, mica, graphite and talc, waxing is commonly used to prevent lubrication and seizure.
(4) When using fasteners, screw in at an appropriate speed and strength, use a torque wrench or socket wrench as much as possible, and avoid using a monkey wrench or electric wrench, without being too fast or too large. .. If the tightening speed is too fast, the temperature will rise sharply, causing seizure. The nut must be screwed perpendicular to the axis of the bolt. Washers can be used to effectively prevent overtightening.

However, if seizure occurs in the process of tightening the bolt, the conventional nut cannot be loosened even with a tool such as a wrench.

Therefore, as a fastener for preventing seizure, for example, in Patent Document 1, seizure due to the bolt being inserted diagonally can be prevented, and the bolt can be smoothly inserted from any direction. Female screw parts that can be fastened and fastening parts using the same are disclosed.
In the female screw part of Patent Document 1, the side on which the protrusion is formed by forming a protrusion at a position on the extension line of the female screw vine winding of the screwless portion formed on the bolt insertion side of the female screw part main body. Even if the bolt is inserted diagonally, the screw of the bolt is normally screwed with the female screw of the female thread part, and the bolt is inserted diagonally without the upright surfaces of the thread starting end of the bolt and the female thread part colliding with each other. By doing so, it is possible to prevent seizure.

Republished WO2010 / 106775 Gazette

However, seizure of the fastener is not caused only by inserting the bolt diagonally, but it is caused by various factors, and once seizure occurs, the fastener can be used with a tool such as a wrench. It cannot be loosened.

Therefore, in order to solve the above problems, it is an object of the present invention to provide an anti-seizure fastener that can easily loosen the fastening state from the seizure state by rotation even after seizure has occurred. To do.

In order to solve the above-mentioned problems in the prior art, the present invention has taken the following technical solutions.
In the description of the present invention, terms such as "inside", "down", and "up" that indicate the orientation and the positional relationship are based on the orientation shown in the drawing, the orientation often placed during work, and the positional relationship. ..
In addition, the direction or positional relationship is for explaining the present invention and simplifying the description, and the referenced device or element must have a specific direction and be constructed or operated in a specific direction. It does not indicate or suggest that.
Furthermore, terms such as "first" and "second" are used only to distinguish the explanations and do not mean to indicate or imply relative importance.

The anti-seizure fastener according to the present invention is
The first nut, which is screwed into a bolt and consists of a hexagonal head and a tubular body,
An unthreaded second nut that fits into the first nut so as to cover the body of the cylinder and is used next to the first nut.
Consists of two nuts
The first nut has a housing groove formed in the body of the cylinder.
The second nut is formed with a pressure receiving plate that fits in the accommodating groove.
Even if the first nut is seized
By rotating the second nut in the direction opposite to the nut fastening direction and fitting the pressure receiving plate in the accommodating groove, the second nut is moved to the first nut side to create a gap between the nut and the object to be fastened.
Release the fastening force stored in the tightening direction of the first nut,
It is a seizure prevention fastener characterized by making it easy to remove the two nuts from the bolts.

Further, the seizure prevention fastener according to the present invention is
The first nut, which is screwed into a bolt and consists of a hexagonal head and a tubular body,
An unthreaded second nut that fits into the first nut so as to cover the body of the cylinder and is used next to the first nut.
Consists of two nuts
The first nut has a stopper and a storage groove formed in the cylinder body.
The second nut is formed with a pressure receiving plate that fits in the accommodating groove and a rotating block.
The stopper of the first nut is formed by forming a set of two stoppers with a rotating block interposed between them.
While the first nut is being rotated in the fastening direction, the rotating block pushes and moves one of the stoppers, so that the second nut rotates along with the rotation of the first nut.
In a configuration in which the pressure receiving plate fits in the accommodating groove when the rotating block abuts on the other stopper when the second nut is rotated in the direction opposite to the fastening direction.
Even if the first nut is seized
By rotating the second nut in the direction opposite to the nut fastening direction and fitting the pressure receiving plate in the accommodating groove, the second nut is moved to the first nut side to create a gap between the nut and the object to be fastened.
Release the fastening force stored in the tightening direction of the first nut,
It is a seizure prevention fastener characterized by making it easy to remove the two nuts from the bolts.

The first nut is threaded (threaded) to screw into the bolt.
The seizure prevention fastener according to the present invention sandwiches the object to be fastened between the working surface of the bolt and the second nut (the surface close to the bolt side).

The wrench used for fastening the anti-seizure fastener according to the present invention comprises a torque wrench and a hexagonal ring fixed to one end of a fixing plate provided on the lower surface side of the torque wrench.
A hexagonal through hole is formed at the tip of the torque wrench, and the nut can be tightened with a predetermined torque.
In addition, the hexagonal ring also has a hexagonal through hole, but since the through hole of the hexagonal ring is formed at one end of the fixing plate, no torque is set, so the nut is limited to the force. Can be squeezed or loosened.
The inner diameter of the hexagonal through hole of the torque wrench and the inner diameter of the hexagonal through hole of the hexagonal ring are the same.
The hexagonal shape and diameter of the first nut are the same as the hexagonal shape and diameter of the second nut.
Therefore, the first nut and the second nut can be tightened together.

An A convex end, which is a cylinder body portion, is formed on the lower surface side of the first nut, and a through hole for inserting a bolt into the axial center is formed in the entire first nut including the A convex end.
Three A stoppers, which are stoppers, are arranged at equal intervals on the outer peripheral surface of the A convex end, and each A stopper is composed of two stoppers, a first A stopper and a second A stopper.
On the bottom surface (bolt side) of the A convex end, three A accommodating grooves, which are accommodating grooves, are formed.

The inner wall of the second nut is a non-threaded (unthreaded) surface, and three A rotating blocks, which are rotating blocks, are arranged at equal intervals on the inner wall of the second nut.
The A rotation block is arranged between the first A stopper and the second A stopper, respectively.
Therefore, when the first nut is rotated in the direction of tightening the bolt, the A rotation block pushes and moves the stopper of one of the two, and while rotating the second nut in accordance with the rotation of the first nut, the object to be fastened is moved. Can be tightened.

That is, when the A rotation block is in contact with the first A stopper, the A rotation block pushes and moves the first A stopper, and the second nut is rotated in accordance with the rotation of the first nut to tighten the object to be fastened. At this time, the directions of the first nut and the second nut overlap (the six corners are facing the same direction), and the hexagonal shape and diameter of the first nut are the second nut. Since it has the same hexagonal shape and diameter as the above, the first nut and the second nut can be tightened together.
On the other hand, when the A rotation block is in contact with the second A stopper, the directions of the first nut and the second nut do not match (the six corners do not face the same direction).

Three A pressure receiving plates, which are pressure receiving plates, are formed at equal intervals on the inner wall of the second nut, and the lower surface of the A pressure receiving plate is on the same horizontal plane as the lower surface of the second nut, and the three A pressure receiving plates are formed. Can be accommodated in each of the three A accommodating grooves formed in the first nut.
When the A rotation block is in contact with the first A stopper, the directions of the first nut and the second nut are overlapped (the six corners are facing the same direction), and the A pressure receiving plate Is in a state where it does not fit in the A accommodating groove, but when only the second nut is rotated so that the A rotation block is in contact with the second A stopper, the directions of the six corners of the first nut and the second nut are one. Although it is not done, the A pressure receiving plate can be accommodated in the A accommodating groove.

An inclined surface is formed between the A accommodating groove and the lower surface of the A convex end.
The inclined surface is inclined by 5 to 10 degrees with respect to the lower surface of the A convex end.
Since the inclined surface is formed, the A pressure receiving plate can easily enter the A accommodating groove.

Another anti-seizure fastener according to the present invention is
The first nut, which is screwed into a bolt and consists of a hexagonal head and a tubular body,
An unthreaded second nut that fits into the first nut so as to cover the body of the cylinder and is used next to the first nut.
A washer that fits into the tip of the cylinder body of the first nut and rotates in conjunction with the first nut.
A rotating rod that penetrates the cylinder body of the first nut in the screwing direction and has a rotating plate at the tip.
Consists of
A pressure receiving plate is formed on the second nut.
The washer has a storage groove in which the rotating plate can be accommodated.
Even if the first nut is seized
By rotating the second nut in the direction opposite to the nut fastening direction and fitting the rotating plate in the accommodating groove, the washer is moved to the first nut side to create a gap between the nut and the object to be fastened.
Release the fastening force stored in the tightening direction of the first nut,
It is a seizure prevention fastener characterized by making it easy to remove the two nuts from the bolts.

Further, another anti-seizure fastener according to the present invention is
The first nut, which is screwed into a bolt and consists of a hexagonal head and a tubular body,
An unthreaded second nut that fits into the first nut so as to cover the body of the cylinder and is used next to the first nut.
A washer that fits into the tip of the cylinder body of the first nut and rotates in conjunction with the first nut.
A rotating rod that penetrates the cylinder body of the first nut in the screwing direction and has a rotating plate at the tip.
Consists of
The first nut has a stopper formed on the body of the cylinder.
A pressure receiving plate and a rotating block are formed on the second nut.
The washer has a housing groove in which the rotating plate can be accommodated.
The stopper of the first nut is formed by forming a set of two stoppers with a rotating block interposed between them.
While the first nut is being rotated in the fastening direction, the rotating block pushes and moves one of the stoppers, so that the second nut rotates along with the rotation of the first nut.
In a configuration in which the pressure receiving plate fits in the accommodating groove when the rotating block abuts on the other stopper when the second nut is rotated in the direction opposite to the fastening direction.
Even if the first nut is seized
By rotating the second nut in the direction opposite to the nut fastening direction and fitting the rotating plate in the accommodating groove, the washer is moved to the first nut side to create a gap between the nut and the object to be fastened.
Release the fastening force stored in the tightening direction of the first nut,
It is a seizure prevention fastener characterized by making it easy to remove the two nuts from the bolts.

The first nut is threaded (threaded) to screw into the bolt.
Another anti-seizure fastener according to the present invention sandwiches the object to be fastened between the bolt and the working surface of the washer on the first nut side (the surface close to the bolt side).

Three arcuate grooves are formed at equal intervals on the inner wall of the circular hole in the center of the washer.
Further, the washer has three through D accommodating grooves, which are accommodating grooves, the upper surface portion of the cylinder body portion of the first nut has a C convex end, and the lower surface portion of the cylinder body portion of the first nut has a thin convex end. is there.
There is a snap ring at the end of the tubular body of the thin convex end of the first nut, and three arc-shaped ends are formed at equal intervals on the outer peripheral surface of the snap ring, and each of the three arc-shaped ends is a washer. Fits into the three arcuate grooves of.
Further, the tip of the C convex end, which is the cylinder body portion of the first nut, is a screw sleeve.

A through hole for inserting a bolt into the axial center is formed in the entire first nut including the C convex end, the thin convex end, the snap ring, and the screw sleeve, which are the tubular body portions of the first nut.
The first nut is provided with three through holes penetrating from the C convex end to the thin convex end at equal intervals in the circumferential direction.

The inner wall of the second nut is a non-threaded (unthreaded) surface, and three C-rotating blocks, which are rotating blocks, are arranged at equal intervals on the inner wall of the second nut.
Three C stoppers, which are stoppers, are arranged at equal intervals on the outer peripheral surface of the C convex end, and each C stopper is composed of two stoppers, a first C stopper and a second C stopper.
The C rotation block is arranged between the first C stopper and the second C stopper, respectively.

Therefore, when the first nut is rotated in the direction of tightening the bolt, the C rotation block pushes and moves the stopper of one of the two, and while rotating the second nut in accordance with the rotation of the first nut, the object to be fastened is moved. Can be tightened.
That is, when the C rotation block is in contact with the second C stopper, the C rotation block pushes and moves the second C stopper, and while rotating the second nut in accordance with the rotation of the first nut, tightens the object to be fastened. At this time, the directions of the first nut and the second nut overlap (the six corners are facing the same direction), and the hexagonal shape and diameter of the first nut are the second. Since it has the same hexagonal shape and diameter as the nut, the first nut and the second nut can be tightened together.
On the other hand, when the C rotation block is in contact with the first C stopper, the directions of the first nut and the second nut do not match (the six corners do not face the same direction).

On the inner wall of the second nut, three D pressure receiving plates, which are pressure receiving plates, and three main rods are arranged at equal intervals on the inner wall side, respectively.
The upper surface of the D pressure receiving plate is on the same horizontal plane as the upper surface of the second nut, and the upper surface of the main rod is on the same horizontal plane as the upper surface of the second nut.

When the C rotation block pushes and moves the 2nd C stopper and tightens the object to be fastened while rotating the 2nd nut in accordance with the rotation of the 1st nut, the rotating plate is not contained in the D accommodating groove. However, if only the second nut is rotated so that the C rotation block is in contact with the first C stopper, the rotating plate can be accommodated in the D accommodating groove.

A small nut is screwed into the screw sleeve.
The rotary rod penetrates the tubular body portion of the first nut in the screwing direction, has a rotary plate at the tip, and has a cylindrical end at the other end.
Two driven rods are formed on the outer peripheral surface of the cylindrical portion at the end of the cylinder.
The lower surface of the plate of the D pressure receiving plate abuts on the upper end surface of the C convex end, and the rotating plate abuts on the washer and the thin convex end.
The driven rod at the end of the cylinder comes into contact with the D pressure receiving plate and the main rod, respectively.

The hexagonal shape and diameter of the first nut are the same as the hexagonal shape and diameter of the second nut.
Therefore, the first nut and the second nut can be tightened together.
The hexagonal shape and diameter of the small nut is smaller than the hexagonal shape and diameter of the second nut and therefore does not interfere with the cylindrical end of the tip of the rotating rod.
The tip of the cylindrical end is formed in a dome shape, and a slit is formed in the end face of the dome shape.

The axial length of the snap ring is longer than the axial length of the washer.
This is because when the rotating plate fits in the D accommodating groove formed in the washer, the washer moves on the snap ring in the direction of the first nut, so that the length of the washer in the axial direction of the snap ring is increased accordingly. This is because it needs to be longer than the axial length.

Further, when the rotating plate fits in the D accommodating groove formed in the washer, the washer moves on the snap ring in the direction of the first nut, so that a gap is created between the washer and the first nut.
The D accommodating groove formed in the washer is inclined by 5 to 10 degrees in the vicinity of the D accommodating groove on the upper surface side (tip side of the bolt) of the washer.
The inclined surface makes it easier for the rotating plate of the rotating rod to enter the D accommodating groove.

The present invention has the following effects.
After inserting the bolt into the object to be fastened, fasten it with a nut using a torque wrench.
When it is necessary to remove the anti-seizure fastener of the present invention from the object to be fastened, the nut can be removed from the object to be fastened using a torque wrench.
Seizure of fasteners occurs when the nut is tightened, but when it occurs, the nut remains locked and cannot be tightened or loosened.
In particular, since a preload (pressure in the direction perpendicular to the tightening rotation direction) is generated on the contact surface between the fastener and the object to be fastened, the fastener cannot be loosened.
In order to eliminate the preload, it is necessary to generate a gap on the contact surface.
Therefore, the second nut is rotated in the loosening direction to generate a gap between the second nut and the object to be fastened, and the preload is released.
As a result, the first nut can be loosened.
The nut can be loosened by rotating the nut using the hexagonal ring of the torque wrench of the present invention.
Using a torque wrench makes it easier to remove the nut from the bolt.

Perspective view and cross-sectional schematic view of the bolt with B nut and A nut attached. Perspective view showing an embodiment of B nut (left) and A nut (right). Top view showing the movement of the B nut in the rotation direction when the bolt (left) and the B nut seen from the B nut side are attached to the A nut. Schematic diagram showing the configuration of a wrench (top is a view from diagonally below, bottom is a view from diagonally above) Perspective view and cross-sectional schematic view with washers, C nuts and D nuts attached to bolts. Cross-sectional view with washers, C nuts and D nuts attached to bolts Schematic plan view of C nut and D nut installation and schematic plan view of cooperation between rotating plate and washer Schematic configuration of C nut and D nut Schematic configuration of washer and rotating rod Schematic diagram of the structure of A accommodation groove (left) and D accommodation groove (right)

Examples of the present invention will be described with reference to the drawings.
The examples described below are for explaining the present invention and do not limit the scope of the present invention.
Based on the examples of the present invention, all examples that can be easily conceived by those skilled in the art belong to the scope of protection of the present invention.

As shown in FIG. 1, the seizure prevention fastener according to the present invention is screwed into a bolt, and has an A nut 3 of a first nut composed of a hexagonal head and a tubular body portion, and a tubular body portion. It is made of a non-threaded second nut B nut 2 which is fitted to the A nut 3 so as to cover the A nut 3 and is used next to the A nut 3.
The A nut 3 and the bolt 1 are threaded (threads are formed), although not shown in all drawings.

The bolt 1 sandwiches the object to be fastened with the working surface of the B nut 2 (the surface close to the hexagonal portion of the bolt 1).
At the same time as tightening the A nut 3 with the bolt 1, the B nut 2 can also rotate while tightening the object to be fastened.

As shown in FIG. 4, the wrench includes a torque wrench 12 and a hexagonal ring 14 fixed to one end of a fixing plate 13 provided on the lower surface side of the torque wrench 12.
A hexagonal through hole is formed at the tip of the torque wrench 12, and the nut can be tightened with a predetermined torque.
Further, the hexagonal ring 14 also has a hexagonal through hole, but since the through hole of the hexagonal ring 14 is formed at one end of the fixing plate 13, no torque is set. The nut can be tightened or loosened as long as possible.
The inner diameter of the hexagonal through hole of the torque wrench 12 and the inner diameter of the hexagonal through hole of the hexagonal ring 14 are the same.

As shown in FIGS. 1, 2 and 3, an A convex end 4 is formed on the lower surface side of the A nut 3, and a through hole is formed in the entire A nut 3 including the A convex end 4.
The diameter of the screw hole 9 of the A convex end 4 is the same as the diameter of the screw hole 9 of the A nut 3, and the screw hole 9 formed through the A nut 3 and the A convex end 4 has a bolt 1 Is inserted.
On the outer peripheral surface of the A convex end 4, there are three sets of block structures formed at equal intervals, and each block structure is composed of two A stoppers 5.
On the bottom surface (bolt side) of the A convex end 4, there are three A accommodating grooves 6 formed at equal intervals in the circumferential direction.

The inner wall of the B nut 2 is a non-threaded (unthreaded) surface, and the three A rotating blocks 8 are arranged at equal intervals on the inner wall of the B nut 2.
As shown in FIG. 3, each of the three A-rotating blocks 8 fits into the A-stoppers 5 having a block structure of three sets.
Three A pressure receiving plates 7 are arranged at equal intervals on the inner wall of the B nut 2, the lower surface of the A pressure receiving plate 7 is on the same horizontal plane as the lower surface of the B nut 2, and the three A pressure receiving plates 7 are respectively. It can fit in the three A accommodating grooves 6 formed in the A nut 3.

As shown in FIG. 1, the hexagonal shape and diameter of the A nut 3 are the same as the hexagonal shape and diameter of the B nut 2.
When the A rotation block 5 is in contact with the first A stopper 41, the directions of the A nut and the B nut are overlapped as shown in FIG. 1 (the six corners are facing the same direction). Is.
Therefore, the torque wrench 12 can be used to tighten the A nut 3 and the B nut 2 together.
Since the A rotation block 5 is arranged between the two stoppers (the first A stopper 41 and the second A stopper 42) of the A stopper 5, when the A nut 3 is rotated in the direction of tightening the bolt, the A rotation block 5 Pushes and moves the first A stopper 41, and while rotating the B nut 2 in accordance with the rotation of the A nut 3, the object to be fastened can be tightened.
At this time, the A pressure receiving plate 7 is not contained in the A accommodating groove 6.

On the other hand, when the A rotation block 5 is in contact with the second A stopper 42, the directions of the A nut and the B nut do not match (the six corners do not face the same direction). , The A pressure receiving plate fits in the A accommodating groove, and the B nut 2 is moved to the A nut 3 side to create a gap between the nut 2 and the object to be fastened, so that the fastening force stored in the tightening direction of the nut is released. It is easier to remove the two nuts from the bolts.

As shown in FIG. 10, an inclined surface 40 is formed between the A accommodating groove 6 and the lower surface of the A convex end 4.
The inclined surface 40 is inclined by 5 to 10 degrees with respect to the lower surface of the A convex end 4.
Since the inclined surface 40 is formed, the A pressure receiving plate 7 can easily enter the A accommodating groove 6.

Next, another anti-seizure fastener according to the present invention will be described.

As shown in FIG. 5, it is screwed into a bolt and fitted to the C nut 19 of the first nut composed of the hexagonal head and the tubular body portion and the C nut 19 so as to cover the tubular body portion. , Consists of an unthreaded second nut, the D nut 18, which is used adjacent to the C nut 19.
The C nut 19 and the bolt 1 are threaded (threaded), although not shown in all drawings.
Further, another seizure prevention fastener according to the present invention is fitted to the tip of the cylinder body portion of the C nut 19, and the washer 20 and the cylinder body portion of the C nut 19 that rotate in conjunction with the C nut 19 are screwed. It also has a rotating rod 33 that penetrates in the advancing direction and has a rotating plate 34 at its tip.
The bolt 1 sandwiches the object to be fastened with the washer 20.

As shown in FIG. 9, three arcuate grooves 36 are formed at equal intervals on the inner wall of the circular hole in the center of the washer 20.
Further, the washer 20 has three penetrating D accommodating grooves 35, and as shown in FIG. 8, there is a C convex end 21 on the upper surface of the C nut 19, and a thin convex end 24 on the lower surface of the C nut 19. ..
There is a snap ring 25 at the further end of the thin convex end 24 of the C nut 19, and the outer peripheral surface of the snap ring 25 has three arcuate end portions 26 formed at equal intervals, and as shown in FIG. 7, three arcuate ends. The end portions 26 are fitted into the three arcuate grooves 36 of the washer 20, respectively.

Although not shown, the C nut 19 is formed with a screw hole 9 penetrating from the screw sleeve 16 at the further end of the C convex end 21 to the snap ring 25 at the further end of the thin convex end 24.
As shown in FIG. 6, the C nut 19 is provided with three through holes 23 penetrating from the C convex end 21 to the thin convex end 24 at equal intervals around the axis of the bolt.

On the outer peripheral surface of the C convex end 21, there are three sets of block structures arranged at equal intervals, and each block structure is composed of two C stoppers 22 (first C stopper 43 and second C stopper 44).
The inner wall of the D nut 18 is a non-threaded (unthreaded) surface, and as shown in FIG. 8, three C rotating blocks 29 are arranged at equal intervals on the tubular inner wall of the D nut 18. ..
The three C rotation blocks 29 are accommodated between two C stoppers 22 (first C stopper 43, second C stopper 44) having a block structure of three sets, respectively.

As shown in FIGS. 7 and 8, when the C nut 19 is rotated in the direction of tightening the bolt 1, the D nut 18 rotates in synchronization with the C nut 19.
This is because the C rotation block 29 is arranged between the two stoppers (the first C stopper 43 and the second C stopper 44) of the C stopper 22, and when the C nut 19 is rotated in the direction of tightening the bolt 1. This is because the C rotation block 29 pushes and moves the second C stopper 44 to rotate the D nut 18 in accordance with the rotation of the C nut 19.

The hexagonal shape and diameter of the C nut 19 is the same as the hexagonal shape and diameter of the D nut 18.
Then, as shown in FIG. 7, when the C rotation block 29 is in contact with the second C stopper 44, the directions of the C nut 19 and the D nut 18 are overlapped (six corners are facing the same direction). Therefore, the C nut 19 and the D nut 18 can be tightened together by the torque wrench 12.
At this time, the rotating plate 34 is not contained in the D accommodating groove 35.
On the other hand, when the C rotation block 29 is in contact with the first C stopper 43, the directions of the C nut 19 and the D nut 18 do not match (the six corners do not face the same direction). ..

On the inner wall of the D nut 18, three D pressure receiving plates 27 and three main rods 28, which are pressure receiving plates, are arranged at equal intervals on the inner wall side, respectively.
The upper surface of the D pressure receiving plate 27 is on the same horizontal plane as the upper surface of the D nut 18, and the upper surface of the main rod 28 is on the same horizontal plane as the upper surface of the D nut 18.

When the C rotation block pushes and moves the second C stopper 44 and tightens the object to be fastened while rotating the second nut in accordance with the rotation of the first nut, the rotating plate 34 is contained in the D accommodating groove 35. Although it is not in the state, if only the D nut 18 is rotated so that the C rotation block 29 is in contact with the first C stopper 43, the rotating plate 34 can be accommodated in the D accommodating groove 35.
As a result, the washer 20 is moved to the C nut 19 side to create a gap between the washer 20 and the object to be fastened, so that the fastening force stored in the tightening direction of the nut is released and it becomes easy to remove the two nuts from the bolt. ..

The hexagonal shape and diameter of the small nut 17 is smaller than the hexagonal shape and diameter of the D nut 18, so the small nut 17 does not interfere with the cylindrical end 30 of the tip of the rotating rod 33.
The small nut 17 is threaded (threaded) and screwed into a male screw (not shown) on the screw sleeve 16, where the three rotating rods 33 each have three through holes 23. Is inserted into.
As shown in FIG. 9, each rotating rod 33 has a rotating plate 34 at the lower end and a cylindrical end 30 at the upper end.
Two driven rods 32 are formed on the outer peripheral surface of the cylindrical portion of the cylindrical end 30.

As shown in FIGS. 5 and 7, the lower surface of the plate of the D pressure receiving plate 27 abuts on the upper end surface of the C convex end 21, and the rotating plate 34 abuts on the washer 20 and the thin convex end 24.
The driven rod 32 of the cylindrical end 30 comes into contact with the D pressure receiving plate 27 and the main rod 28, respectively.

As shown in FIG. 8, the tip surface of the cylindrical end 30 is formed in a dome shape, and the slit 31 is formed in the end surface of the dome shape.

The axial length of the snap ring 25 is longer than the axial length of the washer 20.
This is because when the rotating plate 34 enters the corresponding D accommodating groove 35, the washer 20 moves on the snap ring 25 in the direction of the C nut 19, so that the length of the snap ring 25 in the axial direction is increased by that amount. This is because it needs to be longer than the axial length of 20.
Further, when the rotating plate 34 enters the corresponding D accommodating groove 35, the washer 20 moves on the snap ring 25 in the direction of the C nut 19, so that a gap is created between the washer 20 and the C nut 19.

As shown in FIG. 10, in the D accommodating groove 35 formed in the washer 20, the vicinity of the D accommodating groove 35 on the upper surface side (tip side of the bolt 1) of the washer 20 is inclined by 5 to 10 degrees.
The presence of the inclined surface 40 facilitates the corresponding rotating plate 34 to enter the D accommodating groove 35.

Next, the usage will be described.
The method of using the seizure prevention fastener including the B nut 2, the A nut 3, the A convex end 4, the A stopper 5, the A pressure receiving plate 7, and the A rotating block 8 in the present invention is as follows.

When tightening the object to be fastened with the bolt 1, first, the B nut 2 is fitted to the A convex end 4 of the A nut 3.
At this time, as shown in FIG. 3, the three A rotation blocks 8 are fitted into each of the three sets of A stoppers 5 by two so as to fit between the two A stoppers 5.

As shown by the arrow indicating the rotation direction in FIG. 3, in the initial state in which the A nut 3 and the B nut 2 are tightened to the bolt 1 while rotating in the direction of the arrow, the bolt 1 has the A nut 3 and the A nut 3 along its axial direction. Screw the B nut 2.
The nut rotates so that the hexagonal upper surfaces of the A nut 3 and the B nut 2 completely overlap each other when viewed from above vertically.
At this time, the three A pressure receiving plates 7 and the three A accommodating grooves 6 are not fitted, and only the three A pressure receiving plates 7 and the lower surfaces of the A convex ends 4 are in contact with each other.

Next, the A nut 3 is inserted into the hexagonal through hole of the torque wrench 12 so that the hexagonal ring 14 fits into the B nut 2.
Then, the torque wrench 12 is rotated to rotate the A nut 3 and the B nut 2 at the same time, and the A nut 3 is tightened to the bolt 1.

When the working surface of the B nut 2 (the surface close to the hexagonal part of the bolt 1) touches the object to be fastened, the lower surface of the A convex end 4 (the surface close to the hexagonal part of the bolt 1) pushes the A pressure receiving plate 7. , A nut 3 and B nut 2 are completely tightened to the bolt 1 with the torque wrench 12.
At this time, there is a gap between the B nut 2 and the A nut 3.

When it is necessary to remove the A nut 3 and the B nut 2 from the bolt 1, the A nut 3 is inserted into the hexagonal through hole of the torque wrench 12 so that the hexagon ring 14 fits into the B nut 2.
When the torque wrench 12 is rotated in the direction opposite to the direction in which the nut is tightened in this state, normally, the A nut 3 and the B nut 2 rotate in the opposite directions at the same time, and the A nut 3 and the B nut 2 are bolted 1. However, if the A nut 3 is seized on the bolt 1, the torque wrench 12 cannot rotate the seized A nut 3 in the opposite direction.

That is, since the torque wrench 12 cannot be tightened to a predetermined torque or more, the A nut 3 that has been seized and stuck cannot be rotated in the opposite direction.
Therefore, the B nut 2 is rotated in the opposite direction by using the hexagonal ring 14 fixed to one end of the fixing plate 13 provided on the lower surface side of the torque wrench 12.
Since the hexagonal ring 14 is formed at one end of the fixing plate 13, no torque is set, so that the B nut 2 can be loosened with a strong force.

When the B nut 2 is rotated in the direction opposite to the tightening direction, the A rotation block 8 pushes and moves the first A stopper 41, and the A pressure receiving plate 7 fits in the A accommodating groove 6.
Then, a gap is created between the B nut 2 and the object to be fastened, and the fastening force stored in the tightening direction of the B nut 2 and the A nut 3 is released, so that the A nut 3 is removed from the bolt 1. It will be easier.
Then, if the torque wrench 12 continues to rotate in the direction opposite to the tightening direction, the A nut 3 can be easily removed from the bolt 1.

If the nut is seized on the bolt 1, the A nut 3 cannot be easily removed from the bolt 1 even if the A nut 3 is rotated in the opposite direction due to the tightening force generated by the tightening by the torque wrench 12.
However, by rotating the B nut 2 in the opposite direction, the A pressure receiving plate 7 fits in the A accommodating groove 6, and a gap is created between the B nut 2 and the object to be fastened, so that the A nut 3 becomes the object to be fastened. The tightening force that was working is released.
As a result, the tightening force in the rotational direction generated between the A nut 3 and the object to be fastened is eliminated, and the A nut 3 can be easily removed from the bolt 1.

Another embodiment of the present invention is a screw sleeve 16, a small nut 17, a D nut 18, a C nut 19, a washer 20, a C convex end 21, a C stopper 22, a thin convex end 24, a snap ring 25, an arcuate end 26, The method of using the seizure prevention fastener including the D pressure receiving plate 27, the main rod 28, the C rotating block 29, the cylindrical end 30, the driven rod 32, the rotating rod 33, and the rotating plate 34 is as follows.

As shown in FIG. 5, the D nut 18 is fitted so as to fit in the C convex end 21 of the C nut 19, and the lower surface of the D pressure receiving plate 27 and the upper surface of the C convex end 21 are brought into contact with each other.
At this time, there is a gap between the lower surface of the D nut 18 and the upper surface of the C nut 19.
Due to this gap, the C nut 19 ensures that the D nut 18 is inverted when the seized D nut 18 and the C nut 19 are removed, as in the above-described embodiment of the A nut 3 and the B nut 2. Will be.
Further, when the D nut 18 is fitted so as to fit in the C convex end 21 of the C nut 19, the three C rotation blocks 29 of the D nut are provided on the side surface of the C convex end 21 of the C nut 19. Fit so that it fits between the 1st C stopper 43 and the 2nd C stopper 44.

When the C nut 19 is rotated and tightened to the bolt 1 according to the arrow indicating the rotation direction in FIG. 7, the D nut 18 rotates in synchronization with the C nut 19, but in this state, the C nut 19 and the D nut 18 The orientations of the hexagons of are exactly the same when viewed from above the axial direction of the bolt 1.
At this time, the C rotation block 29 of the D nut 18 comes into contact with the second C stopper 44 of the C stoppers 22 (first C stopper 43, second C stopper 44) so that the D nut 18 is aligned with the C nut 19. Rotate.

The washer 20, the C nut 19, and the D nut 18 are inserted into the bolt 1 in this order, and the three arcuate end portions 26 formed on the side surface of the snap ring 25 are fitted into the three arcuate grooves 36 of the washer 20. By matching, the washer 20 is also rotated by the rotation of the snap ring 25.
Further, the rotating plate 34 is located in the gap between the thin convex end 24 and the washer 20.

The two driven rods 32 at the cylindrical end 30 at the tip of the rotating rod 33 are interlocked with the main rod 28 located near the D pressure receiving plate 27 of the D nut 18.
As shown in FIG. 7, the two driven rods 32 are arranged so as to sandwich the main rod 28.
Further, the rotating plate 34 at the other end of the rotating rod 33 is arranged so as not to fit into the D accommodating groove 35 formed in the washer 20 when the nut is tightened.

Next, the C nut 19 and the D nut 18 are inserted into the hexagonal opening of the torque wrench 12 until the D nut 18 is fitted into the hexagonal ring 14 of the torque wrench 12.
Then, the torque wrench 12 is rotated to rotate the C nut 19 and the D nut 18 at the same time, and the C nut 19 and the D nut 18 are tightened to the bolt 1.

When the working surface of the washer 20 (the surface close to the hexagonal portion of the bolt 1) touches the object to be fastened, the thin convex end 24 of the C nut 19 pushes the rotating plate 34, while the C nut 19 and the D nut 18 are torque wrench 12. It is completely tightened to the bolt 1.
At this time, there is a gap between the C nut 19 and the washer 20.

In order to maintain the positions of the C nut 19 and the D nut 18, it is necessary to tighten the small nut 17 fitted in the screw sleeve 16.
The small nut 17 is screwed into the screw sleeve 16 (not shown in all drawings, but the contact surface between the screw sleeve 16 and the small nut 17 is threaded (threads are formed). There are.).).
Even if the lower surface of the small nut 17 comes into contact with the D pressure receiving plate 27 of the D nut 18, the small nut 17 continues to tighten the small nut 17 until the D pressure receiving plate 27 is fixed to the C convex end 21 and does not move.
When the D nut 18 and the C nut 19 are seized and become stuck, there is a gap between the D nut 18 and the C nut 19 so that the C nut 19 can rotate the D nut 18 in the opposite direction.

If it is necessary to remove the D nut 18 and the C nut 19 from the bolt 1, remove the small nut 17 from the screw sleeve 16, then insert the C nut 19 into the hexagonal through hole of the torque wrench 12, and the hexagon ring 14 is D. It fits into the nut 18.
In this state, when the torque wrench 12 is rotated in the direction opposite to the direction in which the nut is tightened, normally, the C nut 19 and the D nut 18 rotate in the opposite directions at the same time, and the C nut 19 and the D nut 18 are bolted 1. However, if the C nut 19 is seized on the bolt 1, the torque wrench 12 cannot rotate the seized C nut 19 in the opposite direction.

That is, since the torque wrench 12 cannot be tightened to a predetermined torque or more, the C nut 19 which has been seized and does not move cannot be rotated in the opposite direction.
Therefore, the D nut 18 is rotated in the opposite direction by using the hexagonal ring 14 fixed to one end of the fixing plate 13 provided on the lower surface side of the torque wrench 12.
Since the hexagonal ring 14 is formed at one end of the fixing plate 13, no torque is set, so that the D nut 18 can be loosened with a strong force.

To loosen the D nut 18, first remove the small nut 17 from the screw sleeve 16.
Next, when the D nut 18 is rotated in the direction opposite to the tightening direction, the D pressure receiving plate 27 and the main rod 28 move in the direction opposite to the tightening direction.
As the main rod 28 moves, the driven rod 32 also rotates, and the cylindrical end 30 also rotates.
When the cylindrical end 30 rotates to a certain angle, the rotating plate 34 rotates together with the cylindrical end 30.
At the same time, the rotation of the D nut 18 causes the C rotation block 29 to push and move the first C stopper 43, and the rotation of the C nut 19 causes the C nut 19 to be fitted by the arcuate end portion 26 and the arcuate groove 36. The washer 20 rotates, and the rotating plate 34 fits in the D accommodating groove 35.
Then, the washer 20 supported by the rotating plate 34 at the other end of the rotating rod 33 moves to the C nut 19 side, a gap is created between the washer 20 and the object to be fastened, and the C nut 19 and the D nut are formed. By releasing the fastening force stored in the tightening direction of 18, the C nut 19 can be easily removed from the bolt 1.
Then, if the torque wrench 12 continues to rotate in the direction opposite to the tightening direction, the C nut 19 can be easily removed from the bolt 1.

If one or all of the driven rods 32 are damaged and do not rotate, the slit 31 can be used to rotate the rotating rod 33.

In the present invention, the screw sleeve 16, small nut 17, D nut 18, C nut 19, washer 20, C convex end 21, C stopper 22, thin convex end 24, snap ring 25, arcuate end 26, D pressure receiving plate 27, The effects of the seizure prevention fastener including the main rod 28, the C rotating block 29, the cylindrical end 30, the driven rod 32, the rotating rod 33, and the rotating plate 34 are as follows.

If the nut is seized on the bolt 1, the C nut 19 cannot be easily removed from the bolt 1 even if the C nut 19 is rotated in the opposite direction due to the tightening force generated by the tightening by the torque wrench 12.
However, by rotating the D nut 18 in the opposite direction, the D pressure receiving plate 27 and the main rod 28 move in the direction opposite to the tightening direction, and the driven rod 32 rotates the rotating plate 34 together with the cylindrical end 30. The rotating block 29 pushes and moves the first C stopper 43, the washer 20 rotates due to the rotation of the C nut 19, the rotating plate 34 fits in the D accommodating groove 35, and a gap is created between the washer 20 and the object to be fastened. The tightening force exerted on the object to be fastened by the C nut 19 is released.
As a result, the fastening force stored in the tightening direction of the C nut 19 is released, so that the C nut 19 can be easily removed from the bolt 1.

Further, after the C nut 19 and the D nut 18 are fixed to the object to be fastened, a large tightening force is generated between the C nut 19 and the washer 20, and the rotating plate 34 between the C nut 19 and the washer 20 snaps. Supported by 25.
Since the arcuate end portion 26 of the snap ring 25 is caught in the arcuate groove 36 of the washer 20, the C nut 19 rotates in synchronization with the washer 20 via the snap ring 25.
When the C nut 19 and the washer 20 push the rotary plate 34 together, the rotary plate 34 also follows the synchronous rotation of the C nut 19 and the washer 20.

Next, when the C nut 19 vibrates due to the vibration of the object to be fastened, the C nut 19, the washer 20, and the rotating plate 34 synchronize with each other, and the D nut 18 also vibrates.
There is a constant rotational force in the circumferential direction, but when the small nut 17 pushes the D pressure receiving plate 27 and the D nut 18, the D nut 18 generates a constant rotational force in the circumferential direction and rotates the D nut 18. It becomes difficult to make it.
Further, when the D nut 18 vibrates through the bolt 1, a constant rotational force in the circumferential direction is generated.
When the D nut 18 drives the main rod 28, a constant rotational force is generated.
Since the nut 19 and the washer 20 press the rotating plate 34 together, the driven rod 32 rotates.
When the rotation of the rotating plate 34 is restricted, the rotating rod 33 and the cylindrical end 30 also regulate the rotation.

That is, the rotating plate 34, the C nut 19, and the washer 20 move synchronously due to the vibration of the object to be fastened.
The structure of the C nut 19, the structure of the rotating plate 34, the rotating rod 33, and the washer 20 function as an integral fastener.
Therefore, even if some of the fasteners vibrate, the C nut 19 does not come off from the bolt 1.

As described above, although the description has been made based on the embodiments, the present invention is not limited to the above embodiments, and these can be modified and modified as long as they are based on the essential concept and scope of the present invention.

1 Bolt 2 B Nut 3 A Nut 4 A Convex End 5 A Stopper 6 A Accommodating Groove 7 A Pressure Receiving Plate 8 A Rotating Block 9 Screw Hole 12 Torque Wrench 13 Fixing Plate 14 Hexagon Ring 16 Screw Sleeve 17 Small Nut 18 D Nut 19 C Nut 20 Washer 21 C Convex end 22 C Stopper 23 Through hole 24 Thin convex end 25 Snap ring 26 Arc-shaped end 27 D Pressure receiving plate 28 Main rod 29 C Rotating block 30 Cylindrical end 31 Slit 32 Driven rod 33 Rotating rod 34 Rotating plate 35 D Accommodating groove 36 Arc-shaped groove 40 Inclined surface 41 1st A stopper 42 2nd A stopper 43 1st C stopper 44 2nd C stopper

Claims (5)

The first nut, which is screwed into a bolt and consists of a hexagonal head and a tubular body,
An unthreaded second nut that fits into the first nut so as to cover the body of the cylinder and is used next to the first nut.
Consists of two nuts
The first nut has a housing groove formed in the body of the cylinder.
The second nut is formed with a pressure receiving plate that fits in the accommodating groove.
,
By rotating the second nut in the direction opposite to the nut fastening direction and fitting the pressure receiving plate in the accommodating groove, the second nut is moved to the first nut side to create a gap between the nut and the object to be fastened.
Release the fastening force stored in the tightening direction of the first nut,
An anti-seizure fastener that makes it easy to remove the two nuts from the bolts. The first nut, which is screwed into a bolt and consists of a hexagonal head and a tubular body,
An unthreaded second nut that fits into the first nut so as to cover the body of the cylinder and is used next to the first nut.
Consists of two nuts
The first nut has a stopper and a storage groove formed in the cylinder body.
The second nut is formed with a pressure receiving plate that fits in the accommodating groove and a rotating block.
The stopper of the first nut is formed by forming a set of two stoppers with a rotating block interposed between them.
While rotating the first nut in the fastening direction, one stopper pushes and moves the rotating block , so that the second nut rotates with the rotation of the first nut.
When the second nut is rotated in the direction opposite to the fastening direction, the pressure receiving plate fits in the accommodating groove when the other stopper abuts on the rotating block .
,
By rotating the second nut in the direction opposite to the nut fastening direction and fitting the pressure receiving plate in the accommodating groove, the second nut is moved to the first nut side to create a gap between the nut and the object to be fastened.
Release the fastening force stored in the tightening direction of the first nut,
An anti-seizure fastener that makes it easy to remove the two nuts from the bolts. The first nut, which is screwed into a bolt and consists of a hexagonal head and a tubular body,
An unthreaded second nut that fits into the first nut so as to cover the body of the cylinder and is used next to the first nut.
A washer that fits into the tip of the cylinder body of the first nut and rotates in conjunction with the first nut.
A rotating rod that penetrates the cylinder body of the first nut in the screwing direction and has a rotating plate at the tip.
Consists of
A pressure receiving plate is formed on the second nut.
The washer has a housing groove in which the rotating plate can be accommodated.
,
By rotating the second nut in the direction opposite to the nut fastening direction and fitting the rotating plate in the accommodating groove, the washer is moved to the first nut side to create a gap between the nut and the object to be fastened.
Release the fastening force stored in the tightening direction of the first nut,
An anti-seizure fastener that makes it easy to remove the two nuts from the bolts. The first nut, which is screwed into a bolt and consists of a hexagonal head and a tubular body,
An unthreaded second nut that fits into the first nut so as to cover the body of the cylinder and is used next to the first nut.
A washer that fits into the tip of the cylinder body of the first nut and rotates in conjunction with the first nut.
A rotating rod that penetrates the cylinder body of the first nut in the screwing direction and has a rotating plate at the tip.
Consists of
The first nut has a stopper formed on the body of the cylinder.
A pressure receiving plate and a rotating block are formed on the second nut.
The washer has a housing groove in which the rotating plate can be accommodated.
The stopper of the first nut is formed by forming a set of two stoppers with a rotating block interposed between them.
While rotating the first nut in the fastening direction, one stopper pushes and moves the rotating block , so that the second nut rotates with the rotation of the first nut.
When the second nut is rotated in the direction opposite to the fastening direction, the rotating plate fits in the accommodating groove when the other stopper abuts on the rotating block .
,
By rotating the second nut in the direction opposite to the nut fastening direction and fitting the rotating plate in the accommodating groove, the washer is moved to the first nut side to create a gap between the nut and the object to be fastened.
Release the fastening force stored in the tightening direction of the first nut,
An anti-seizure fastener that makes it easy to remove the two nuts from the bolts. In the accommodation groove,
The anti-seizure fastener according to any one of claims 1 to 4, wherein an inclined surface is formed.