JP2003120645A - Installing structure of screw rod inserted into installing hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an installing structure of a screw rod exhibiting an excellent looseness preventive effect with a simple structure, causing no projection of a locking nut from an outside surface of an installing part, and superior in mass productivity and practicability. SOLUTION: In this installing structure of the screw rod, the screw rod 4 for arranging a screw part 3 in at least a tip part is inserted into an installing hole 2 arranged in the installing part 1 in a through state, a base end part is locked on one side of the installing hole 2, a nut body 6 is engaged with a nut engaging part 5 formed in an end part of the installing hole 2 from the opposite side of this installing hole 2, this nut body 6 is threadably attached to the screw part 3 of the tip part of the screw rod 4, the screw rod 4 is installed in the installing hole 2, and is inserted into the installing hole. The installing structure of the screw rod inserted into the installing hole is constituted so that a recessed groove 7 is formed on an outer peripheral surface of the nut body 6 or an inner peripheral surface of the nut engaging part 5 of the installing hole 2, a flexible locking member 8 is arranged in this recessed groove 7 in a state of projecting a little from the recessed groove 7, and the locking member 8 is elastically pressed to and locked on the inner peripheral surface of the nut engaging part 5 of the installing hole 2 or the outer peripheral surface of the nut body 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a threaded rod for inserting a threaded rod such as a retaining shaft bolt (shackle pin) of a shackle or a shaft pin of a pulley into a mounting hole in a locking state. It is related to the mounting structure of.

[0002]

2. Description of the Related Art For example, a screw rod such as a shackle pin of a shackle or a shaft pin of a pulley is provided in a mounting state (for example, an end of a U-shaped shackle body) in a penetrating state. After being inserted into the mounting hole, a nut is screwed from the outside of the mounting hole to the screw portion provided at the tip of the screw rod to fix the screw rod.

Further, conventionally, this screw rod is provided with an anti-loosening mechanism so as not to come loose from the mounting portion.

The locking mechanism will be briefly described. For example, in a shackle, a mating through hole that is in communication with each other is provided in a tip screw portion of a shackle pin and a nut screwed to the screw portion. By inserting a locking pin such as a split pin into the alignment through hole, the nut is prevented from loosening and rotating with respect to the shackle pin.

However, in order to provide such a locking mechanism, through holes must be provided in both the shackle pin and the nut, and a locking pin for inserting into the through hole must be manufactured separately. As described above, there is a problem in that it is very time-consuming to manufacture and the cost is high.

Further, in this loosening prevention mechanism, the locking pin must be inserted from the outer side surface of the nut in a state where the nut is screwed to the shackle pin, that is, the shackle pin is mounted and fixed to the mounting hole of the shackle body. Since the locking pin is inserted in this state, it is necessary that at least the tip of the shackle pin and the nut be configured to project outside the outer surface of the shackle body so that the locking pin can be inserted. If you try, the objects protruding from the outer surface of the shackle body may be caught during work, which may hinder the progress of the work. Some people are requesting a structure in which the base end and the locking nut do not project.

The present invention has been made after studies and studies in view of these problems, and has been solved. A simple structure provides a good anti-loosening effect without the labor and cost involved in manufacturing. A screw rod that is inserted into an epoch-making mounting hole that is excellent in mass productivity and practicality, which can be demonstrated, and can be designed so that the locking nut does not protrude from the outer surface of the mounting portion. It is intended to provide a mounting structure.

[0008]

The gist of the present invention will be described with reference to the accompanying drawings.

In the mounting hole 2 provided in the mounting portion 1 in a penetrating state,
A screw rod 4 provided with a screw portion 3 at least at its tip is inserted and disposed with its base end being locked to one side of the mounting hole 2 and from the opposite side of this mounting hole 2 to the end of the mounting hole 2. The nut body 6 is engaged with the formed nut engaging portion 5, and the nut body 6 is screwed onto the screw portion 3 at the tip of the screw rod 4 to insert the screw rod 4 into the mounting hole for mounting the mounting hole 2. And a mounting hole 2 for mounting the nut rod 6 on the outer peripheral surface of the nut body 6.
A concave groove 7 is formed on the inner peripheral surface of the nut engaging portion 5, and a locking member 8 having flexibility is provided in the concave groove 7 in a state of slightly protruding from the concave groove 7, and the nut body 6 is provided with the screw rod. 4 is screwed into the mounting hole 2, the locking member 8 is elastically locked to the inner peripheral surface of the nut engaging portion 5 of the mounting hole 2 or the outer peripheral surface of the nut body 6. The present invention relates to a mounting structure of a screw rod to be inserted.

A locking portion 10 with which a large diameter portion 9 provided at the base end portion of the screw rod 4 abuts and locks is provided on one side of the mounting hole 2 or on the peripheral edge on one side of the mounting hole 2. , The mounting hole 2
The nut body 6 that engages with the nut engaging portion 5 and is screwed to the screw portion 3 at the tip end portion of the screw rod 4 is abutted on the inner peripheral surface or the bottom surface of the nut engaging portion 5 on the opposite side. The present invention relates to a mounting structure for a screw rod inserted through a mounting hole according to claim 1, characterized in that a nut locking portion (11) for contacting and locking is provided.

Further, a screw rod base engaging portion 12 with which the large diameter portion 9 of the base end portion of the screw rod 4 is engaged in a non-rotating state is provided at one end of the mounting hole 2. Claim 1,
The present invention relates to a screw rod mounting structure which is inserted into the mounting hole described in any one of 2 above.

Further, a large diameter portion 9 provided at the base end portion of the screw rod 4 is engaged with a screw rod base engaging portion 12 formed at the end portion on one side of the attachment hole 2, and the attachment hole 2 is attached. The nut body 6 engages with the nut engaging portion 5 formed at the end portion on the opposite side of
The large diameter portion 9 and the nut body 6 are arranged so as to be substantially flush with or immersed in the outer surface of the mounting portion 1 forming the mounting hole 2.
The present invention relates to a mounting structure of a screw rod which is inserted into the mounting hole described in any one of 3 to 3.

Further, a tool insertion concave portion 13 for rotating the nut body 6 is formed on the exposed outer surface of the nut body 6 exposed from the mounting hole 2, and the concave groove 7 is formed on the outer peripheral surface of the nut body 6. The ring-shaped locking member 8 which is formed so as to be slightly protruded from the recessed groove 7 is engaged with the recessed groove 7 and is inserted into the mounting hole according to any one of claims 1 to 4. The present invention relates to a mounting structure for a screw rod.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the present invention (how to carry out the invention) will be briefly described with reference to the drawings and showing its function and effect.

A screw rod 4 is inserted into the mounting hole 2 of the mounting portion 1 with its base end being locked to one side of the mounting hole 2, and the nut engaging portion 5 is inserted from the opposite side of the mounting hole 2. When the nut body 6 is engaged with the screw body 4 and the nut body 6 is screwed onto the screw portion 3 at the tip of the screw rod 4 to attach the screw rod 4 to the mounting hole 2, the outer peripheral surface of the nut body 6 or the nut engaging portion. Since the locking member 8 slightly projecting from the concave groove 7 on the inner peripheral surface of 5 has flexibility, the locking member 8 is against the inner peripheral surface of the nut engaging portion 5 or the outer peripheral surface of the nut body 6. While flexing, it will be locked in a tightly contacted state.

That is, the elastic force of the locking member 8 causes the nut body 6 to be extremely firmly held in the non-rotating state with respect to the screw portion 3 (screw rod 4). Even if vibration or impact is applied, the nut body 6 does not loosen and rotate.

Further, unlike the conventional structure in which the screw rod and the nut body are provided with a locking mechanism which is time-consuming and costly to manufacture,
In the present invention, the concave groove 7 is simply provided on the outer peripheral surface of the nut body 6 or the inner peripheral surface of the nut engaging portion 5, and the locking member 8 is provided in the concave groove 7.
Since it is possible to realize a configuration that exhibits the above-mentioned effects simply by providing the above in a slightly protruding state, this configuration is a configuration that can be easily designed and realized, and a product that is excellent in mass productivity and inexpensive can be configured and provided.

Further, in the present invention having such a structure that the locking member 8 is arranged on the inner peripheral surface of the nut engaging portion 5 or the outer peripheral surface of the nut body 6 to obtain the locking effect, the conventional locking mechanism is used. It is not necessary for the nut to protrude from the outer surface of the mounting portion 1 as in the case of the stop mechanism, and thus the nut body 6 that fits in the nut engaging portion 5 in a substantially flush state with the outer surface of the mounting portion 1 forming the mounting hole 2, for example. Can be adopted, and with such a configuration, it is possible to eliminate the inconvenience in work due to the nut body 6 projecting from the outer surface of the mounting portion 1, and in addition, there is no protrusion and it is compact and easy to handle. The product can be configured.

Further, for example, a locking portion 10 with which a large-diameter portion 9 provided at the base end portion of the screw rod 4 abuts and locks on one side of the mounting hole 2 or on the peripheral edge on one side of the mounting hole 2. Is provided on the inner peripheral surface or the bottom surface of the nut engaging portion 5 on the opposite side of the mounting hole 2, and is engaged with the nut engaging portion 5 and screwed to the screw portion 3 at the tip of the screw rod 4. By providing the nut locking portion 11 with which the nut body 6 abuts and locks, the screw rod 4 is simply inserted into the mounting hole 2, and the nut body 6 is screwed into the screw rod 4 from the opposite side of the mounting hole 2. The large diameter portion 9 of the screw rod 4 is surely brought into contact with the engaging portion 10 to be in a butting state and the nut body 6 is securely attached to the nut engaging portion 11 only by screwing and tightening on the portion 3. Since the screw rod 4 is abutted and locked so that the screw rod 4 is prevented from coming off from the mounting hole 2 (mounting portion 1), the mounting work of the screw rod 4 can be performed more easily. It is the thing.

Further, for example, if a screw rod base engaging portion 12 with which the large diameter portion 9 of the base end portion of the screw rod 4 engages in a non-rotating state is provided at one end of the mounting hole 2, Since the screw rod 4 inserted through the mounting hole 2 is in the rotation stop state, the screw rod 4 is simply screwed to the screw portion 3 of the screw rod 4 in the rotation stop state. Can be attached to the attachment hole 2 (attachment portion 1), and the work of attaching the screw rod 4 can be performed more easily.

Further, for example, the large diameter portion 9 provided at the base end portion of the screw rod 4 is engaged with the screw rod base engaging portion 12 formed at the end portion on one side of the attachment hole 2 to attach the screw rod 4. The nut body 6 engages with the nut engaging portion 5 formed at the end portion on the opposite side of the hole 2, and the large diameter portion 9 and the nut are attached to the outer surface of the attaching portion 1 forming the attaching hole 2. If the body 6 is arranged so as to be substantially flush or immersive, the large-diameter portion 9 of the screw rod 4 and the nut body 6 may protrude from the outer surface of the mounting portion 1 to prevent objects from being caught during work. It is possible to reliably construct a product that is compact and easy to handle without causing any inconvenience in work.

Further, for example, the mounting hole 2 of the nut body 6
A tool insertion concave portion 13 for rotating the nut body 6 is formed on the exposed outer surface, and the concave groove 7 is formed on the outer peripheral surface of the nut body 6, so that the concave shape is slightly protruded from the concave groove 7. By engaging the ring-shaped locking member 8 having the property, the tool can be set in the tool insertion recess 13 exposed from the mounting hole 2 without setting the tool on the outer peripheral surface of the nut body 6 and rotating the tool. Therefore, the turning and tightening operation of the nut body 6 can be easily and reliably performed until the nut body 6 is substantially flush with the mounting hole or is in the retracted state. As compared with the case where the groove 7 is formed, the groove 7 is formed on the outer peripheral surface of the nut body 6 because it is easily performed in production, so that mass productivity is also improved.

[0023]

Embodiments of the present invention will be described with reference to the drawings.

1 and 2 show a first embodiment, and FIG. 3 shows a second embodiment.

Explaining the first embodiment, the present embodiment applies the present invention to the mounting structure of the rotary shaft (screw rod 4) of the pulley.

The pulley 17 of this embodiment will be described. A main body 1 having a substantially U-shaped cross section as shown in FIG.
A roller body 16 is arranged between the side arms 15 facing each other on the left and right of the main body 1, and a mounting hole 2 provided in a penetrating state in each of the left and right side arms 15 and a central hole formed in the roller body 16. By inserting and fixing the screw rod 4, the roller body 16 is rotatably provided with respect to the main body 1 by using the screw rod 4 as a support shaft.

Explaining the mounting structure of the screw rod 4, the screw rod 4 using a bolt is inserted from one side (right side of the drawing) of the mounting hole 2 of the right arm 15 in FIG. The bolt head) is locked to the right side of the mounting hole 2, and the nut body 6 is engaged with the nut engaging portion 5 formed at the end of the mounting hole 2 of the left arm 15 from the opposite side of the mounting hole 2. At the same time, the nut body 6 is screwed to the screw portion 3 at the tip of the screw rod 4 to attach the screw rod 4 to the mounting hole 2.

In this embodiment, a concave groove 7 is formed on the outer peripheral surface of the nut body 6, and a locking member 8 having flexibility is provided in the concave groove 7 so as to slightly project from the concave groove 7, When the screw rod 6 is screwed onto the screw rod 4, the locking member 8 is attached to the mounting hole 2
The nut engaging portion 5 is configured to be elastically (pressure contacted) locked with the inner peripheral surface thereof.

More specifically, in this embodiment, the mounting hole 2 of the left arm 15 is the nut engaging portion 5, and the hole diameter of the nut engaging portion 5 is substantially the same as the outer diameter of the nut body 6. Configured to.

The concave groove 7 of this embodiment is formed on the entire outer circumferential surface of the nut body 6 in the circumferential direction.

Further, as the locking member 8, an O-ring 8 made of synthetic resin is adopted, and the O-ring 8 is fitted and locked in the concave groove 7 on the entire outer peripheral surface of the nut body 6 to lock the nut body 6. The O-ring 8 is slightly projected from the entire outer peripheral surface.

Therefore, when the nut body 6 is engaged (fitted) with the nut engaging portion 5 (when the nut body 6 is screwed onto the screw rod 4 and the nut body 6 engages with the nut engaging portion 5). The O-ring 8 projecting from the entire outer circumference of the nut body 6 is elastically pressed (pressed) to the entire inner circumference of the nut engaging portion 5 in a tightly contacting state, and the elastic force of the elastic force allows the nut body 6 to be locked. Is held in a rotation-stopped state with respect to the nut engaging portion 5 so as to be in an extremely strong loosening-stop state.

Further, in this embodiment, a locking portion 10 with which the large diameter portion 9 provided at the base end portion of the screw rod 4 abuts and locks is provided on one side of the mounting hole 2 and the mounting hole is provided. The nut body 6 that engages with the nut engaging portion 5 and that is screwed to the screw portion 3 at the tip of the screw rod 4 is in contact with the inner peripheral surface of the nut engaging portion 5 on the opposite side of 2. A nut locking portion 11 for locking is provided.

More specifically, the bolt head of the screw rod 4 employing the bolt 4 is the large diameter portion 9. Further, the large-diameter portion 9 is formed in a shape in which the outer (tip) portion has a larger diameter than the inner portion through a step in a substantially middle portion.

On the other hand, the mounting hole 2A on the right side in FIG.
The outside portion is formed to have a larger diameter than the middle portion, and the step portion at the boundary between the outside large diameter hole portion and the small diameter hole portion is used as the locking portion 10. Further, the outer diameter large hole portion of the right mounting hole 2A is set to a diameter substantially matching the outer diameter of the large diameter portion 9, and the hole diameter of the inner diameter small hole portion of the right mounting hole 2A is set to the bolt head. When the bolt 4 is inserted from the outside of the mounting hole 2A by setting the hole diameter to substantially match the outer diameter of the small diameter portion of the
The stepped surface of the large-diameter portion 9 is brought into contact with and locked to the large-diameter portion 9 so that the bolt 4 is prevented from coming off from the inside of the right mounting hole 2A.

The nut body 6 also has a larger diameter at one end side (left side in FIG. 1) of the outer peripheral surface than at the other end side through a step in the intermediate portion, like the bolt head (large diameter portion 9). It is formed into a shape that In this embodiment, the concave groove 7 is provided on the outer peripheral surface of the nut body 6 on the other end side (small diameter portion).

On the other hand, the mounting hole 2B (nut engaging portion 5) on the left side in FIG. 1 is formed such that the outer portion is larger in diameter than the middle portion thereof, and the outer large diameter hole portion and the small diameter hole portion are formed. The step portion at the boundary of is the nut locking portion 11. Further, the hole diameter of the outer diameter large hole portion of the left mounting hole 2B is set to a diameter that substantially matches the outer diameter of the large diameter portion of the nut body 6, and the hole diameter of the inner diameter small hole portion of the left mounting hole 2B is set. Is set to a diameter that substantially matches the outer diameter of the small diameter portion of the nut body 6, and the nut body 6 is engaged from the outside of the nut engaging portion 5 with the small diameter portion facing inward and the nut body 6 When the bolt is screwed onto the screw portion 3 of the bolt 4, the step portion at the intermediate portion of the nut body 6 is abutted and locked to the nut locking portion 11 so that the nut body 6 moves toward the inner side of the nut engaging portion 5. It is configured to be in a retaining state.

Further, in this embodiment, a screw rod base engaging portion 12 with which the large diameter portion 9 of the base end portion of the screw rod 4 is engaged in a non-rotating state is provided at one end portion of the mounting hole 2. It has a structure.

More specifically, a part of the inner peripheral surface of the large-diameter hole portion outside the mounting hole 2A formed in a round hole shape is formed into a flat surface shape, and the flat surface portion is engaged with the screw rod base portion. Joint part 12

On the other hand, a part of the outer peripheral surface of the small-diameter portion of the disk-shaped head (large-diameter portion 9) of the bolt 4 that engages (fits) with the mounting hole 2A on the right side is formed into a flat surface shape, When the bolt 4 is inserted into the mounting hole 2A on the right side, the flat surface portion of the head of the bolt 4 engages with the screw rod base engaging portion 12 and the bolt 4
Is configured so as not to rotate with respect to the mounting hole 2.

Therefore, in this embodiment, the large diameter portion 9 of the bolt 4 can be obtained by simply inserting the bolt 4 from the right side mounting hole 2A.
Can be abutted and locked to the locking portion 10 in a state of abutting and preventing rotation, and the nut body 6 is simply engaged with the left mounting hole 2B (nut engaging portion 5) and the nut body 6 is bolted. Since the nut body 6 can be engaged and locked in the nut locking portion 11 in a slip-off preventing state simply by screwing the screw rod 4 to the tip end portion thereof, the mounting work of the screw rod 4 can be performed extremely easily. At this time, the O-ring 8 slightly projecting from the concave groove 7 formed on the outer peripheral surface of the nut body 6 firmly elastically presses (press-contacts) with the inner peripheral surface of the nut engaging portion 5, so that the nut pair 6 is extremely strong. It has a good anti-loosening effect, and the rotating shaft of the pulley does not come off.

Further, in this embodiment, the screw rod 4 is attached to the screw rod base engaging portion 12 formed at one end of the mounting hole 2.
The large-diameter portion 9 provided at the base end of the nut body 6 engages, and the nut body 6 engages with the nut engagement portion 5 formed at the end portion on the opposite side of the attachment hole 2 so that the attachment hole 2 is attached. The large diameter portion 9 and the nut body 6 are arranged substantially flush with the outer surface of the mounting portion 1 to be formed.

More specifically, by adopting as the screw rod 4 a bolt having a bolt head having a thickness that does not project from the mounting hole 2 when the screw rod 4 is inserted into the mounting hole 2A. The large diameter portion 9 of the bolt 4 is configured to be flush with the outer surface of the main body 1.

Similarly, when the nut body 6 is engaged with the left mounting hole 2B (nut engaging portion 5), the nut body 6 is thick enough to prevent the nut body 6 from protruding from the nut engaging portion 5. Is adopted so that the nut body 6 is flush with the outer surface of the main body 1.

In this embodiment, a tool insertion recess 13 for rotating the nut body 6 is formed on the exposed outer surface of the nut body 6 exposed from the mounting hole 2.

More specifically, the tool insertion recess 13
Has a plurality of notched concave portions formed on the outer surface of the large diameter portion of the nut body 6 at predetermined intervals in the circumferential direction of the nut body 6.

Therefore, the nut body 6 can be rotatably operated by using a tool having a plurality of projecting portions which can be inserted into the tool insertion concave portion 13 at the tip, and by this method, the nut body 6 is used as the outer surface of the main body 1. It can be screwed up evenly.

Explaining the second embodiment, in the present embodiment, the present invention is applied to the mounting structure of the connecting pin (screw rod 4) of the shackle.

Explaining the shackle 22 of the present embodiment, the substantially U-shaped metal fitting body 1 is used as the mounting portion 1, and mounting holes 2 are formed at both ends of the metal fitting body 1 in a penetrating state. From one side, a screw rod 4 having a bolt having a screw portion 3 at the tip is inserted to lock the base end (bolt head) to one side of the mounting hole 2, and from the opposite side of the mounting hole 2. The nut body 6 is engaged with the nut engaging portion 5 formed at the end of the mounting hole 2, and the nut body 6 is attached to the bolt 4 (screw rod 4).
The bolt 4 is screwed into the screw portion 3 at the tip of the to attach the bolt 4 to the mounting hole 2, and the bolt 4 is installed on the metal fitting body 1.

Since the mounting structure of the bolt 4 and the details of each part in this embodiment are substantially the same as those in the first embodiment, the description is omitted by giving the same reference numerals to each member.

That is, also in this embodiment, the bolt 4 is simply used.
The large-diameter portion 9 of the bolt 4 can be abutted and locked in a state of abutting against the locking portion 10 and in a rotation-preventing state simply by inserting the right-side mounting hole 2A (nut engaging member). The nut body 6 can be engaged and locked in the nut locking portion 11 in a retaining state only by engaging the nut body 6 with the joint portion 5) and screwing the nut body 6 to the tip portion of the bolt 4. Therefore, the mounting work of the bolt 4 can be performed very easily, and at this time, the O-ring 8 slightly protruding from the concave groove 7 formed on the outer peripheral surface of the nut body 6 has the nut engaging portion 5
Since it is firmly elastically pressed (pressed against) to the inner peripheral surface of, the nut pair 6 exerts a very good anti-loosening effect, and the pivot shaft of the pulley is not disengaged.

Further, the screw rod base engaging portion 12 of this embodiment is different from that of the first embodiment. More specifically, a lower portion of the outer diameter large hole portion of the right side mounting hole 2A formed in a round hole shape as shown in FIG. The engagement portion 12 is used.

On the other hand, a part of the outer peripheral surface of the disk-shaped head portion (large-diameter portion 9) of the bolt 4 that engages (fits) with the mounting hole 2A on the right side is formed in a flat surface shape, and the bolt 4 is on the right side. When the bolt 4 is inserted into the mounting hole 2A, the flat surface portion of the head of the bolt 4 engages with the screw rod base engaging portion 12 so that the bolt 4 is attached to the mounting hole 2A.
It is configured so as to be in a rotation stop state.

In each of the first and second embodiments described above in detail, the large diameter portion 9 of the screw portion 4 and the nut body 6 are flush with the outer surface of the mounting portion 1. Although the configuration is shown, the large-diameter portion 9 and the nut body 6 may be configured so as to protrude from or into the outer surface of the mounting portion 1.

In the first and second embodiments, the nut body 6
Although the locking member 8 is provided only at one place on the entire outer peripheral surface of the above, it may be provided at two or more places.

Further, although the ring-shaped locking member 8 is adopted in the present embodiment, for example, a strip-shaped locking member 8 is adopted instead of the ring-shaped locking member 8 and scattered on the outer peripheral surface of the nut body 6. Also good.

Further, the screw rod base engaging portion 12 has a flat surface shape, and the flat surface portion formed on the large diameter portion 9 of the screw rod 4 is engaged with the flat surface portion to prevent rotation. The shape of the screw rod base engaging portion 12 may be, for example, a concavo-convex engagement detent structure formed by a curved surface or a square surface, and is appropriately designed as long as the screw rod 4 can be favorably detented with respect to the mounting hole 2. It can be changed.

It should be noted that the present invention is not limited to this embodiment, and the specific constitution of each constituent element can be designed as appropriate.

[0059]

Since the present invention is constructed as described above, the screw rod is inserted into the mounting hole of the mounting portion with the base end of the screw rod being locked to one side of the mounting hole. When the nut body is engaged with the nut engaging portion from the opposite side and the nut body is screwed to the screw portion of the tip end of the screw rod to attach the screw rod to the mounting hole, the outer peripheral surface of the nut body or the nut engaging portion Since the locking member that slightly protrudes from the concave groove on the inner peripheral surface of the is flexible, the locking member flexes against the inner peripheral surface of the nut engaging portion or the outer peripheral surface of the nut body while it is elastically pressed in a close contact state. Since the nut body is held in a state in which the nut body is extremely firmly fixed to the screw part (screw rod) by the elastic force of this locking member, the nut body is not subject to vibration or impact. Even if applied, the nut body will not loosen and rotate, and it has a very strong anti-rotation effect Further, in the present invention, simply by providing a concave groove on the outer peripheral surface of the nut body or the inner peripheral surface of the nut engaging portion, and providing a locking member in the concave groove in a slightly protruding state, Since this configuration can achieve the effect, it is a configuration that can be easily designed and realized, and it is an extremely practical and innovative installation that makes it possible to construct and provide inexpensive products with excellent mass productivity. It has a screw rod mounting structure that is inserted into the hole.

Further, in the present invention, it is also possible to design the locking nut so that it does not project from the outer surface of the mounting portion. It is possible to construct a compact and easy-to-handle product with no protrusion, without causing any inconvenience in work such as catching an object at the time of work due to the large diameter portion of the screw rod or the nut body projecting from.

According to the second aspect of the invention, the screw rod is simply inserted through the mounting hole, and the nut body is screwed from the opposite side of the mounting hole to the screw portion of the screw rod to tighten the screw rod. The large-diameter part of the nut securely abuts and engages with the engaging part, and the nut body surely abuts and engages with the nut engaging part, and the screw rod is prevented from coming off from the attaching hole (attaching part). Since it can be fixed to the screw rod, the screw rod can be attached to the mounting hole (mounting portion) very easily, and the screw rod is inserted into the epoch-making mounting hole which is excellent in mass productivity and practicality.

Further, in the invention according to claim 3, since the screw rod inserted through the mounting hole is in a non-rotating state,
The screw rod can be attached just by screwing the nut body onto the screw part of the screw rod in the rotation stop state, and the mounting work of the screw rod can be further facilitated. Excellent mass productivity and practicality are achieved. In addition, it has a screw rod that can be inserted into an epoch-making mounting hole.

Further, in the invention according to claim 4, there is an inconvenience in work such as an object being caught at the time of work due to the large diameter portion of the screw rod and the nut body protruding from the outer surface of the mounting portion. It is a screw rod mounting structure that can be inserted into an epoch-making mounting hole that is excellent in mass productivity and practicality that can reliably construct a compact and easy-to-handle product that does not occur.

Further, according to the invention of claim 5, the tool can be set in the tool insertion recess exposed through the mounting hole without setting the tool on the outer peripheral surface of the nut body and rotating the tool, so that the nut body is mounted. The rotation and tightening operation can be easily and reliably performed until the hole is substantially flush with or immersed in the hole, and moreover, compared with the case where the concave groove is formed on the inner peripheral surface of the nut engaging portion. Since the groove is easily formed on the outer peripheral surface of the nut body, it is easy to manufacture and has a screw rod mounting structure which is inserted into the epoch-making mounting hole excellent in mass productivity and practicality. .

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing a pulley in which a screw rod is inserted through an attachment portion of a first embodiment.

FIG. 2 is a side view of the pulley of the first embodiment.

FIG. 3 is an explanatory cross-sectional view showing a shackle in which a screw rod is inserted through an attachment portion of a second embodiment.

[Explanation of symbols]

1 mounting part 2 mounting holes 3 screw part 4 screw rod 5 Nut engaging part 6 nut body 7 groove 8 locking member 9 large part 10 Locking part 11 Nut locking part 12 Screw rod base engaging part 13 Tool insertion recess

Claims (5)

[Claims] 1. A screw rod having a screw portion at least at a tip end thereof is inserted into a mounting hole provided in a penetrating state in the mounting portion, the base end portion of which is locked to one side of the mounting hole. A nut body is engaged with a nut engaging portion formed at the end of the mounting hole from the side opposite to the mounting hole, and the nut body is screwed to the screw portion at the tip of the screw rod to attach the screw rod to the mounting hole. An attachment structure of a screw rod which is inserted into an attachment hole, wherein a concave groove is formed on an outer peripheral surface of the nut body or an inner peripheral surface of a nut engaging portion of the attachment hole, and the engaging groove has flexibility. When the member is provided slightly protruding from the groove and the nut body is screwed onto the screw rod, the locking member is elastically locked to the inner peripheral surface of the nut engaging portion of the mounting hole or the outer peripheral surface of the nut body. A structure for mounting a screw rod which is inserted into a mounting hole. 2. An engaging portion, which is provided at a base end portion of the screw rod and abuts and engages with a large-diameter portion, is provided on one side of the attaching hole or a peripheral edge on one side of the attaching hole. On the inner peripheral surface or the bottom surface of the nut engaging portion on the opposite side, the nut member that engages with the nut engaging portion and is screwed to the screw portion of the tip end of the screw rod is abutted and locked. The mounting structure for a screw rod inserted through the mounting hole according to claim 1, wherein a stop portion is provided. 3. A screw rod base engaging portion with which a large-diameter portion of the base end portion of the screw rod engages in a non-rotating state at one end of the mounting hole. 2. A screw rod mounting structure which is inserted through the mounting hole according to any one of 1. 4. A large diameter portion provided at a base end portion of the screw rod engages with a screw rod base engaging portion formed at one end portion of the attachment hole, and an end portion on the opposite side of the attachment hole. The nut body is engaged with the nut engaging portion formed in the portion, and the large diameter portion and the nut body are arranged substantially flush with or immersed in the outer surface of the mounting portion forming the mounting hole. The mounting structure for a screw rod inserted into the mounting hole according to any one of claims 1 to 3, wherein 5. A tool insertion concave portion for rotating the nut body is formed on an exposed outer surface exposed from a mounting hole of the nut body, and the concave groove is formed on an outer peripheral surface of the nut body,
5. The ring-shaped locking member having flexibility, which is slightly protruded from the groove, is engaged.
A mounting structure for a screw rod that is inserted into the mounting hole according to any one of 1.