JP3848309B2 - Fall-off prevention device - Google Patents

Description

  The present invention relates to a drop-off prevention device. More specifically, the present invention relates to a drop-off preventing tool that prevents the object to be fixed to the rod-like body or the bolt or the nut from falling off by the elastic force of the coil spring.

  For fixing structures, bolts and nuts are often used in various fields, and are widely used, for example, from reinforced buildings, steel towers, road installations to automobiles and electrical appliances.

For example, a drop-off prevention tool 101 as shown in FIG. 7A described in Patent Document 1 is made of an elastic metal or resin, and includes a knob portion 102 and a coil spring portion 103.
Here, the inner diameter of the coil spring portion is configured to be slightly smaller than the outer diameter of the leg portion of the bolt to which the drop-off prevention tool is attached.

When the fall prevention tool configured as described above is attached to the leg portion of the bolt, the drop prevention tool is brought into contact with the tip of the bolt screwed with the nut, and the direction indicated by symbol A in FIG. By rotating it.
That is, by rotating the drop-off prevention tool in a state where the drop-off prevention tool is in contact with the tip of the bolt, the coil spring part is deformed in the direction in which the inner diameter of the coil spring part is expanded, and the wire of the coil spring part is connected to the leg part of the bolt. It fits along the thread groove provided in the leg part from the end part, and the drop prevention tool is attached to the leg part of the bolt.

  Bolts and nuts fitted with drop-off prevention tools as described above are restricted by the nuts rotating in the disengagement direction by filling the screw grooves formed in the leg portions of the bolts with the strands of the coil spring portions. Nut loosening and falling off are suppressed.

JP 2001-59514 A

  However, in the above-described drop-off prevention device, the strand is firmly fixed to the thread groove by the frictional force. Further, when the drop-off prevention device is rotated in the disengagement direction, the coil spring portion is reduced in its inner diameter. Because the wire of the coil spring part is pressed more strongly against the slope of the thread groove formed on the leg of the bolt and is prevented from rotating because it is pulled, a strong force is applied when removing the fall prevention tool. The strands are deformed, that is, the drop-off prevention tool is removed by destroying the drop-off prevention tool.

  In view of the above-mentioned points, the present invention has a function of preventing a drop-off at the time of mounting, and can be easily attached and detached from the viewpoint that the fixing of the structure is not limited to tightening with bolts and nuts. It is an object of the present invention to provide a drop-off prevention tool that can be reused.

  In order to achieve the above object, a drop-off prevention device according to the present invention includes a coil spring portion in which a wire is wound with substantially the same diameter, and a detachment knob continuously extended from the tip portion of the coil spring portion. A fall prevention tool to be attached to a rod-shaped body having a portion, wherein the coil spring portion has an inner diameter smaller than a circumscribed circle of the rod-shaped body perpendicular to a winding axis of a wire forming the coil spring portion, The detaching knob portion protrudes in the radial direction of the rod-shaped body and includes a spring portion continuously extended from the distal end portion of the detaching knob portion, and the spring portion extends from the proximal end side to the distal end side. It is wound so as to have a spread over.

  In addition, the drop-off prevention device according to the present invention has a coil wire wound around substantially the same diameter, a coil spring portion that fits into a thread groove formed in a leg portion of the bolt, and a continuous portion from the tip of the coil spring portion. A drop-off prevention device having a detaching knob portion extended in an extended manner, wherein the coil spring portion has an inner diameter smaller than an outer diameter of a leg portion of a bolt to be fitted, and the detaching knob portion is formed of the rod-shaped body. A spring portion protruding in the radial direction and continuously extending from the distal end portion of the detaching knob portion is provided, and the spring portion is wound so as to expand from the proximal end side to the distal end side. The

  Here, when the removal preventing tool is removed from the rod-shaped body or the leg portion of the bolt by the detaching knob portion continuously extended from the tip portion of the coil spring portion, the coil spring portion is extended in the direction in which the inner diameter of the coil spring portion is enlarged. The element wire to be formed can be stressed to be deformed, and the element wire forming the coil spring portion becomes floating, reducing the frictional force between the rod-shaped body and the coil spring portion or the leg portion of the bolt and the coil spring portion. be able to.

  In the above-described dropout prevention device of the present invention, attachment and removal can be easily performed, and the dropout prevention device can be removed without being destroyed, and the removed dropout prevention device can be reused.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings to provide an understanding of the present invention.

  FIG. 1 is a schematic perspective view and side view for explaining an example of a drop-off prevention device to which the present invention is applied. The drop prevention tool 1 shown here includes a first coil spring portion 2, a mounting knob portion 3, a detaching knob portion 4, and a second coil spring portion 5.

  In the first coil spring portion, the inner diameter of the first coil spring portion indicated by symbol a in FIG. 1 from the base end portion (upper side in FIG. 1) toward the distal end portion is larger than the outer diameter of the leg portion of the bolt to which the drop-off prevention device is attached. It is formed with a slightly smaller diameter and is wound in a direction that fits from the leg portion of the bolt toward the head when it is rotated clockwise as indicated by symbol b in FIG.

  Here, the first coil spring portion has the wire wound clockwise so as to be fitted to the leg portion of the bolt in which the groove of the right screw is formed, but the leg of the bolt in which the groove of the left screw is formed Of course, when attaching to the part, the strand is wound counterclockwise.

  The mounting knob portion is continuously extended from the base end portion of the first coil spring portion, and is formed so as to protrude in the radial direction of the bolt on which the drop-off prevention device is mounted.

  Here, the mounting knob portion applies stress for deforming the element wire forming the first coil spring portion in the direction in which the inner diameter of the first coil spring portion expands when the drop prevention tool is mounted on the leg portion of the bolt. It is sufficient if it can be applied, and it is not always necessary to be configured to protrude in the radial direction of the bolt to which the drop-off prevention device is attached, and as shown in FIG. It may be configured. However, when the bolt leg portion is inserted through the first coil spring portion and the bolt leg portion protrudes from the base end side of the first coil spring portion, the mounting knob portion protrudes in the axial direction of the bolt. If it prevents the installation of the drop-off prevention tool from being configured, it is necessary to configure the mounting knob part so that it does not hinder the installation of the fall-off prevention tool, such as a structure that protrudes in the radial direction of the bolt. is there.

  Even if the mounting knob portion is not provided, it is not always necessary to form the mounting knob portion when the falling prevention tool can be attached by grasping and rotating any part of the falling prevention tool. However, as described above, the mounting knob portion can apply stress for deforming the element wire forming the first coil spring portion in the direction in which the inner diameter of the first coil spring portion is enlarged, thereby forming the first coil spring portion. It is better that the mounting knob part is formed in order to make it easier for the strands to float, to reduce the frictional force between the bolt leg part and the first coil spring part, and to attach the fall-off prevention device smoothly. preferable.

In view of easily attaching the drop-off prevention tool using a tool, it is desirable that the mounting knob is wound in a hexagonal shape as shown in FIG. That is, since the mounting knob is wound in a hexagonal shape, the drop-off prevention tool can be easily attached to the bolt leg using a general-purpose tool such as a socket wrench. It is preferable to be wound into a shape.
Here, as described above, the mounting knob is wound in a hexagonal shape because it is easily attached using a general-purpose tool, and can be easily attached using a general-purpose tool. If so, the mounting knob portion does not necessarily have to be wound in a hexagonal shape, and may be wound in a rectangular shape or the like.

  Further, the detaching knob portion is continuously extended from the tip portion of the first coil spring portion, and is formed so as to protrude in the radial direction of the bolt to which the drop-off prevention device is attached.

Here, the detaching knob portion gives a stress for deforming the wire forming the first coil spring portion in the direction in which the inner diameter of the first coil spring portion expands when the drop prevention tool is removed from the leg portion of the bolt. It is sufficient if it is configured so as not to obstruct the attachment of the drop-off prevention device, and it is not always necessary to have the shape as shown in FIG. 1, but the shape as shown in FIG. It doesn't matter.
In view of easily removing the drop-off prevention tool using a tool, it is desirable that the detaching knob portion has the strand wound in a hexagonal shape as shown in FIG. That is, since the removal knob is wound in a hexagonal shape, the drop prevention tool can be easily removed from the bolt leg using a general-purpose tool such as a socket wrench. It is preferable to be wound into a shape. In consideration of the convenience of attachment and detachment, when both the mounting knob and the detaching knob are wound in a hexagonal shape, the detaching knob has a larger hexagonal shape than the mounting knob. In this way, it is preferable that the wire is wound. In addition, as described above, the removal knob is wound in a hexagonal shape so that it can be easily attached using a general-purpose tool, and can be easily attached using a general-purpose tool. For example, the release knob portion does not necessarily have to be wound in a hexagonal shape, and may be wound in a rectangular shape or the like.

As described above, when the drop-off prevention tool can be attached without providing the mounting knob portion, the mounting knob portion may not be formed, but the formation of the separation knob portion is essential.
In other words, the drop-off prevention device to which the present invention is applied has a structure in which the element wire of the first coil spring portion having an inner diameter slightly smaller than the outer diameter of the bolt is fitted in the thread groove of the bolt leg portion. Since the strands are firmly fixed to the screw grooves, the strands are sent smoothly in the mounting direction when attaching the fall-off prevention device, but the fall-off prevention tools are easily installed in the removal direction. There is an effect that it cannot be turned. Therefore, in order to realize rotation of the drop-off prevention tool in the detaching direction, it is essential to form a detaching knob.

  Further, the second coil spring portion is continuously extended from the distal end portion of the detaching knob portion, and is the same as the first coil spring portion so that the inner diameter increases from the proximal end portion (upper side in FIG. 1) to the distal end portion. It is wound in the direction. Furthermore, the tip end side of the second coil spring portion is processed so as to have a wave shape.

Here, the second coil spring portion corresponding to the spring portion of the present invention winds the wire in a substantially circular shape, but if the spring portion serves as a guide for guiding the leg portion of the bolt to the first coil spring portion, It is sufficient, and it is not always necessary to wind the wire in a substantially circular shape.
Similarly, it is sufficient that the second coil spring portion serves as a guide for guiding the leg portion of the bolt to the first coil spring portion, and the second coil spring portion is not necessarily wound in the same direction as the first coil spring portion. Considering that the part also plays a role of applying stress to the nut or fixed object in the head direction of the bolt when the fall prevention tool is attached, the bolt is more securely attached to the nut or fixed object. It is preferable that the second coil spring portion is wound in the same direction as the first coil spring portion so that stress can be applied in the head direction.
In the case where only the first coil spring portion has a sufficient function of preventing the dropout, the second coil spring portion is not necessarily formed. However, as described above, since the second coil spring portion has a function as a guide and a function of applying stress to the nut or the fixed object in the head direction of the bolt, it is easier to attach the drop-off prevention device. It is preferable that the second coil spring portion is formed in order to make it possible to prevent the nut or the fixed object from falling off more reliably.

  In addition, the second coil spring portion is processed so as to have a wave shape. The second coil spring portion performs the same function as a so-called wave washer, and the second coil spring portion is applied to a nut or an object to be fixed. This is to increase the stress applied in the head direction of the bolt, and if the stress can be sufficiently ensured without processing so as to have a corrugated shape, the second coil spring portion will necessarily have a corrugated shape. It is not necessary to be processed in the same way.

In view of increasing the stress that the second coil spring portion applies to the nut in the head direction of the bolt by processing the second coil spring portion, the wire whose cross section is substantially rectangular is used. As shown in FIG. 3, the drop prevention tool may be a fall prevention tool wound in a state where the strands forming the second coil spring portion are inclined.
That is, the second coil spring portion performs the same function as a so-called disc spring by winding a wire having a substantially rectangular cross section constituting the second coil spring portion, and the second coil spring portion is a nut. Or you may increase the stress given to the head direction of a volt | bolt with respect to a to-be-fixed object.
In addition, by configuring the second coil spring part with a strand having an irregular cross section (for example, a strand having a substantially rectangular cross section), the contact area with the nut or the object to be fixed can be further secured. It is possible to increase the pressing force that the second coil spring portion applies to the nut or the fixed object toward the head of the bolt.

As shown in FIG. 4 (a), the drop prevention tool constructed as described above is attached to the leg of the bolt by inserting the leg 9 of the bolt 8 through the second coil spring, Stress is applied to the mounting knob in the direction indicated by symbol b in FIG. 4 (a) in a state where the front end 10 of the bolt is in contact, and the first coil spring is deformed in the direction in which the inner diameter of the first coil spring is increased. By rotating the drop-off prevention tool in the direction indicated by reference numeral b in FIG. 4A, the strand of the first coil spring portion is fitted from the front end portion of the bolt along the groove portion. At this time, since the inner diameter of the second coil spring portion is continuously increased from the proximal end portion side to the distal end portion side, it is easy to screw the drop-off prevention tool into the distal end portion of the bolt.
Here, as shown in FIG. 4B, the drop-off prevention tool further rotates from the state in which the second coil spring portion is in contact with the nut 11, and the first drop-off prevention tool as shown in FIG. 4C. The coil spring portion is further fitted along the groove portion and rotated until the second coil spring portion is compressed and deformed in the axial direction of the bolt.

  On the other hand, the removal prevention tool attached to the leg portion of the bolt is subjected to stress in the direction indicated by reference numeral c in FIG. 4 (c) to the release knob portion, and the first coil spring portion is expanded in the direction in which the inner diameter increases. By rotating the drop-off prevention tool in the direction indicated by reference numeral c in FIG. 4C while deforming the one coil spring portion, the strand of the first coil spring portion is removed from the base end portion of the bolt along the groove portion.

When attaching the drop-off prevention tool, stress is applied to the mounting knob portion in the direction indicated by symbol b in FIG. 4A, and when removing, the detaching knob portion is applied in the direction indicated by symbol c in FIG. 4C. By applying the stress, the first coil spring portion can be deformed in the direction in which the inner diameter of the first coil spring portion expands, so that the strands that fit into the thread grooves formed in the leg portions of the bolt become floating, The frictional force between the first coil spring part and the leg part of the bolt is reduced, and the drop-off prevention tool can be attached and removed smoothly.
On the other hand, the drop-off prevention device without applying stress in the direction indicated by reference numeral c in FIG. 4C, that is, without deforming the first coil spring portion in the direction in which the inner diameter of the first coil spring portion increases, is applied to the release knob portion. If the first coil spring part is pulled in the direction in which the inner diameter is removed, the inner diameter of the first coil spring part is pulled in a direction in which the inner diameter is reduced, so that the strands of the first coil spring part are strongly pressed against the inclined surface of the screw groove formed on the leg part of the bolt. Rotation is prevented. That is, when the first coil spring part is deformed in the direction in which the inner diameter of the first coil spring part is increased, the drop-off prevention tool can be easily attached and detached, but the first coil spring part is in the direction in which the inner diameter of the first coil spring part is increased. As long as the coil spring portion is not deformed, the drop-off prevention device does not return in the direction of detachment due to an unexpected impact from the outside.

An example of the drop-off prevention device to which the present invention described above is applied is that the wire of the first coil spring portion is fitted into a screw groove formed on the bolt and the nut is restricted from rotating in the disengagement direction, and the second coil spring portion is By applying stress to the nut in the head direction of the bolt, it is possible to prevent the bolt from dropping off over a long period of time.
That is, since the first coil spring portion having an inner diameter smaller than the outer diameter of the bolt leg portion is fitted in an enlarged state, the frictional force between the first coil spring portion and the bolt leg portion is caused. The strands of the first coil spring portion are firmly fixed to the leg portions of the bolts, and the strands fixed to the bolts restrict the rotation in the nut release direction. In addition, since the second coil spring portion is attached in a state of being compressed and deformed in the axial direction of the bolt, a stress that resists the nut removal direction is applied to the nut by the elastic force of the second coil spring portion. The stress applied to the nut also acts as a stress that presses the element wire of the first coil spring portion into the thread groove formed in the leg portion of the bolt, and the nut is caused by an unexpected impact from the outside to the drop-off prevention device. Increases resistance to returning in the direction of withdrawal.

  In addition, an example of the fall prevention tool to which the present invention is applied can be easily detached from the leg of the bolt by applying stress to the release knob, that is, the bolt without breaking the fall prevention tool. It can be removed from the leg portion, and the drop prevention tool can be reused.

  Moreover, the drop-off prevention tool shown in FIG. 1 can also be used as a bolt fastener. That is, in the above description, the example of preventing the nut attached to the bolt from falling off has been described as an example. However, the fall-off prevention device itself functions as a bolt fastener in the same manner as the nut and is fixed by the bolt. 12 can also be used as a drop-off prevention tool for preventing the drop-out of 12. When used as a bolt fastener, the bolt leg portion is inserted into the second coil spring portion of the drop-off prevention tool in the same manner as the attachment method in the case of using the nut attached to the bolt as described above. With the first coil spring portion and the tip of the bolt in contact with each other, stress is applied to the mounting knob portion in the direction in which the inner diameter of the first coil spring portion expands, and the element for the first coil spring portion is rotated by rotating the drop-off prevention tool. From the tip of the bolt along the groove, and the second coil spring portion is further rotated in the axial direction of the bolt from the state in which the second coil spring portion is in contact with the fixed object fixed by the bolt. As shown in FIG. 5, the anti-drop-off tool is attached to the leg of the bolt by rotating until it is compressed and deformed.

When the fall prevention tool attached as described above does not apply stress to the release knob, the strand of the first coil spring part is fitted into the screw groove formed in the bolt, and the fall prevention tool is in the release direction. And the second coil spring portion applies stress to the object to be fixed in the head direction of the bolt, so that the object to be fixed can be reliably fixed over a long period of time. It should be noted that, when stress is applied to the release knob, it can be easily removed and the drop-off prevention tool can be reused in the same manner as when it functions as a nut drop-off prevention tool. .
Further, since the drop prevention tool has a remarkably smaller mass than the nut, it is possible to reduce the mass of the entire structure, and the effect is particularly remarkable when a large number of bolts such as bridges are fastened.

In the above description, the nuts to be fixed by bolts and the prevention of falling off of the object to be fixed have been described. However, the dropping prevention tool to which the present invention is applied is perpendicular to the winding axis of the wire forming the first coil spring portion. Any rod-shaped body having a circumscribed circle slightly larger than the inner diameter of the first coil spring portion in the direction can be attached, that is, a thread groove having a triangular, quadrangular, hexagonal, etc. cross section is formed. It can also be attached to a rod-shaped body such as a glass tube, a wood tube, or a paper tube, and functions effectively to prevent the object to be fixed to be fixed by the rod-shaped body.
That is, the inner diameter of the first coil spring portion indicated by the symbol a in FIG. 1 is slightly smaller than the circumscribed circle 21 in contact with the rod-shaped body 20 having a triangular or hexagonal screw groove as shown in FIG. If it is formed with a small diameter, it is possible to attach the drop-off prevention tool to the rod-shaped body, and effectively function to prevent the object to be fixed to be fixed by the rod-shaped body.

  In the above description, the second coil spring portion has been described with reference to an example in which the second coil spring portion abuts against a nut or an object to be fixed. However, depending on how the fall-off prevention tool is used, the second coil spring portion may be a bolt leg or rod-like body. Naturally, it may function only as a guide that leads to the first coil spring portion and does not contact the nut or the object to be fixed.

It is the typical perspective view and side view for demonstrating an example of the drop-off prevention tool to which this invention is applied. It is a schematic diagram for demonstrating the modification of an example of the drop-off prevention tool to which this invention is applied. It is a schematic diagram for demonstrating the modification of a 2nd coil spring part. It is a typical figure for demonstrating attachment of an example of the drop-off prevention tool to which this invention is applied. It is a typical figure for demonstrating attachment when an example of the drop-off prevention tool to which this invention is applied functions as a drop-off prevention tool of a to-be-fixed object. It is a typical figure for demonstrating attachment to the rod-shaped body of the drop-off prevention tool to which this invention is applied. It is a figure for demonstrating the conventional drop-off prevention tool.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Falling prevention tool 2 1st coil spring part 3 Mounting knob part 4 Release knob part 5 2nd coil spring part 8 Bolt 9 Leg part 10 Bolt tip part 11 Nut 12 Fixed object 20 Rod-shaped body 21 circumscribed circle

Claims (9)

A coil spring portion in which the wire is wound with substantially the same diameter;
A drop prevention tool attached to a rod-shaped body having a detaching knob portion continuously extended from the tip of the coil spring portion,
The coil spring portion has an inner diameter smaller than a circumscribed circle of the rod-shaped body perpendicular to the winding axis of the wire forming the coil spring portion,
The detaching knob portion protrudes in the radial direction of the rod-shaped body, and includes a spring portion continuously extended from the distal end portion of the detaching knob portion,
The spring part is wound so as to expand from the base end side to the tip end side. A coil spring portion that is wound with substantially the same diameter and that fits into a thread groove formed on a leg portion of the bolt,
A drop-off prevention device comprising a detaching knob portion continuously extended from the tip of the coil spring portion,
The coil spring portion has an inner diameter smaller than the outer diameter of the leg portion of the bolt to be fitted,
The detaching knob portion protrudes in the radial direction of the rod-shaped body, and includes a spring portion continuously extended from the distal end portion of the detaching knob portion,
The spring part is wound so as to expand from the base end side to the tip end side. The dropout prevention tool according to claim 2, wherein the spring portion abuts on a nut attached to the bolt. The dropout prevention tool according to claim 2, wherein the spring portion is in contact with an object to be fixed to the bolt. The drop prevention tool according to claim 3 or 4, wherein the wire forming the spring portion has a corrugated shape. The drop-off prevention tool according to claim 1, 2, 3, 4, or 5, wherein the detaching knob portion is formed by winding a wire in a hexagonal shape. The dropout prevention device according to claim 1, 2, 3, 4, 5, or 6, further comprising a mounting knob portion continuously extended from a base end portion of the coil spring portion. . The dropout prevention tool according to claim 7, wherein the mounting knob is formed by winding a wire in a hexagonal shape. The mounting knob portion and the detaching knob portion are formed by winding a wire in a hexagonal shape,
The wire according to claim 1, claim 2, claim 3, claim 4, or claim 5, wherein the wire is wound so that the detaching knob portion has a larger hexagonal shape than the mounting knob portion. Fall-off prevention tool.

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