JPH06346910A - Screw tool - Google Patents

Abstract

PURPOSE:To perform sealing for preventing a screw tool from loosening and disconnecting surely by a simple constitution and eliminate necessity of an exclusive-use jig in the case of sealing the screw tool. CONSTITUTION:A screw head part 3 with a rotation operation part 2 is provided at the rear end of a screw rod 1. A hole 4 is bored from the outer side of the head part 3 to the tip part of the screw rod 1. Inside diameter of the hole 4 in the tip side of the screw rod 1 is made smaller. Expanding slots 5 are formed from the tip part of the screw rod l so that at least the tip part of the screw rod 1 is divided into plural numbers in the circumferential direction to be formed into expanding pieces 6 respectively. A rod member 8 which is freely inserted into the hole 4 of the screw main body 7 from the opening part of the outer side of the head part 3 and has a diameter larger than the tip part of the hole towards which the diameter becomes narrower is provided. The rod member 8 is inserted into the hole 4 so as to expand the expanding piece 9 outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to screw tools such as bolts and screws.

[0002]

2. Description of the Related Art Conventionally, when attaching an object to be attached to an attachment, it is general to attach it with a screw tool such as a bolt or a screw. By the way, a screw tool such as a bolt or a screw is mounted by screwing the head while rotating the head by using a jig such as a wrench, a wrench, or a driver. However, if vibration is applied after the mounting, the head may be loosened. Also,
Since it can be easily removed with a generally widely used rotary operation jig such as a wrench, a wrench, or a screwdriver, it may be accidentally removed or may be removed by mischief.

Therefore, a spring washer or the like has been conventionally used to prevent loosening, and in order to prevent accidental removal or tampering, that is, the attached screw tool is sealed. Conventionally, the head of a screw tool has a special shape (for example, an elliptical shape) so that it cannot be rotated unless it is a rotary operation jig that fits into the head of the special shape. A specially shaped groove is provided on the, and a rotation operation jig that has an engaging portion that engages with the specially shaped groove is used so that the rotation operation cannot be performed.The screw tool cannot be removed by mischief. It was

[0004]

However, in the related art, a spring washer is used to prevent loosening, it can be prevented from loosening to some extent, but it cannot be said to be a reliable loosening stopper. In order to prevent the screw tool from being removed, the conventional example requires a special dedicated rotation operation jig, and there is the problem that jigs such as spanners, wrenches, and drivers that are commonly used for mounting work cannot be used. there were.

The present invention has been made in view of the above-mentioned problems of the prior art, and has a simple structure that can be reliably sealed to prevent loosening and prevent the screw tool from coming off. In view of the above, a first object is to provide a screw tool that does not require a special dedicated jig, and a screw tool capable of removing the screw tool by removing the seal of the sealed screw tool after attachment is provided. This is the second purpose.

[0006]

In order to solve the problems of the above-mentioned conventional examples and to achieve the object of the present invention, a screw tool of the present invention is provided with a rotary operation part 2 at the rear end of a screw rod part 1. Head 3
Is provided, and a hole 4 is bored from the outer surface of the head 3 to the tip of the threaded rod portion 1, the inner diameter of the hole 4 on the tip end side of the threaded rod portion 1 is reduced, and the hole 4 is divided from the tip end of the threaded rod portion 1. A groove 5 is formed to divide at least the tip of the threaded rod portion 1 into a plurality of pieces in the circumferential direction, and the screw tool body 7 is configured as each spreading piece portion 6,
It is characterized in that it is provided with a bar member 8 which can be inserted into the hole 4 of the screw tool main body 7 from the opening of the outer surface of the head 3 and has a diameter larger than that of the portion of the hole 4 where the diameter of the distal end portion is reduced. Is.

Further, the hole 4 is a screw hole 4a, the rod member 8 is a screw rod 8a, and the rotary operation portion 9 is provided at the rear end of the rod member 8.
It is also preferable to provide.

[0008]

According to the present invention having the above-described structure, the screw rod portion 1 of the screw tool main body 7 is inserted into the hole 11 of the object 10 to be mounted,
Further, it is screwed into the screw hole 13 of the attachment 12 to attach the screw tool body 7 in the first stage. In this first stage, the operation of attaching the screw tool body 7 is performed by using the rotary operation portion 2 of the head 3 provided at the rear end portion of the screw rod portion 1 as with a normal bolt or screw by using a jig such as a wrench, a wrench or a screwdriver. Rotate using. Then, the rod member 8 is inserted into the hole 4 of the screw tool body 7 from the opening of the outer surface of the head 3, and the rod member 8 expands the small diameter portion 4'of the tip end of the hole 4, whereby the screw tool body By pressing the spreading piece 6 of the rear end portion 7 of the screw 7 against the inner wall of the screw hole 13 of the attachment 12 or the rear end edge of the screw hole 13, the screw tool body 7 may be loosened, accidentally or intentionally removed. Will be prevented.

In the case where the hole 4 is the screw hole 4a, the rod 8 is the screw rod 8a, and the rotary operation portion 9 is provided at the rear end of the rod 8, the spreading piece formed by inserting the rod 8 is used. The expansion of the portion 6 to the outside can be performed by rotating the rotation operating portion 9 of the rod 8 with a wrench, a screwdriver or the like. Moreover, in this thing, the screw tool main body 7
When removing the rotary operation part 9 of the rod member 8 by rotating it with a wrench or a screwdriver, the rotary operation part 2 of the head 3 of the screw tool body 7 is removed with a spanner, a wrench,
By rotating with a jig such as a screwdriver, the screw tool body 7 can be removed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings. A threaded rod part 1 having a male thread part 1a on the outer periphery
A screw tool body 7 is configured by providing a head portion 3 having a rotation operation portion 2 at a rear end portion thereof. The head 3 is 6 as shown in FIG.
There are square heads, round heads as shown in FIG. 4, pot heads as shown in FIG. 5, and various other shapes. Also, a rotary operation portion 2 that can be rotated by a rotary operation jig such as a spanner, a wrench, or a screwdriver that is usually used is formed. For example, in the case of FIG. 1, the hexagonal outer periphery of the head 3 constitutes the rotation operation unit 2 by making the head 3 hexagonal,
In the embodiment shown in FIGS. 4 and 5, the head 3 is provided with a + or − groove for rotating operation with a driver. Other than this, the head 3 is used as the rotary operation unit 2 that is normally used.
It is also possible to provide a hexagonal groove or a square groove for rotating with a hexagonal wrench or a square wrench, and use this as the rotary operation unit 2. As the hexagonal head, the + or − groove, the hexagonal groove, the square groove, etc., those generally provided on the head 3 for rotating operation in an ordinary screw tool are adopted.

A hole 4 is bored in the screw body 7 from the outer surface of the head 3 to the tip of the screw rod 1, and the hole 4 has a small inner diameter on the tip side of the screw rod 1. In the embodiment shown in the accompanying drawings, the tip of the hole 4 is tapered such that the diameter gradually decreases toward the tip. A split groove 5 is formed from the tip portion of the threaded rod portion 1 to divide at least the tip end portion of the threaded rod portion 1 into a plurality of portions in the circumferential direction, each of which is a spreading piece portion 6.

Reference numeral 8 in the drawing denotes a rod member 8 which can be inserted into the hole 4 of the screw tool main body 7 from the opening of the outer surface of the head 3. The diameter of the rod member 8 is the same as the diameter of the large diameter portion of the hole 4. The diameter is the same or smaller and is larger than the diameter of the small diameter portion 4a at the tip of the hole 4. Thus, the screw tool of the present invention composed of the screw tool body 7 and the bar member 8 as described above is used when the object 10 to be mounted is mounted on the mounting object 12. That is, FIG. 2 (a)
The screw rod portion 1 of the screw body 7 is inserted into the hole 11 of the object 10 to be attached, and the male screw portion 1 on the outer periphery of the screw rod portion 1 is further inserted.
The first stage of attachment is performed by screwing a into the screw hole 13 of the attachment 12. In this case, the head 3 of the screw tool body 7 is carried out by using a general rotary operation jig for operating a screw tool such as a wrench, a wrench, or a screwdriver, as in the case of mounting a conventional general screw tool. . Next, as shown in FIG. 2B, the rod 8 is inserted into the hole 4 of the screw body 7 from the opening on the outer surface of the head 3 as shown by the arrow a, and the rod 8 causes the tip 4 of the hole 4 to have a small diameter. The diameter of the portion 4'is expanded and the expansion piece 6 of the rear end of the screw body 7 is pressed against the inner wall of the screw hole 13 of the attachment 12 as shown by the arrow B in FIG. Complete. Here, when the rod 8 is not a threaded rod as in the embodiment described later, the hole 13 is formed by driving it with a hammer or the like.
The expansion piece 6 can be expanded by inserting it into the.

FIG. 3 shows another mounting example of the present invention. In this embodiment, the screw rod portion 1 of the screw tool main body 7 is shown.
3A shows an example in which the tip end of the screw rod portion 1 protrudes from the screw hole 13 of the attachment 12, as shown in FIG. 3A. In this case, FIG. When the rod 8 is inserted into the hole 4 of the screw body 7 from the opening on the outer surface of the head 3 as shown by the arrow A, the rod 8 expands the small-diameter portion 4'of the tip of the hole 4 as shown in FIG. The spreading piece 6 at the rear end of the screw body 7 is brought into pressure contact with the rear end edge of the screw hole 13 of the mounting object 12 as shown by an arrow B in FIG.

In the screw tool of the present invention mounted as described above, the male thread portion 1a of the screw tool body 7 is screwed into the screw hole 13 of the mounting object 12 to mount the mounting object 10 on the mounting object 12.
At the same time, the spread piece 6 is pressed against the inner wall of the screw hole 13 of the attachment 12 or the rear end edge of the screw hole 13 to prevent loosening of the screw connection portion of the screw body 7 Further, once attached, the screw body 7 cannot be removed by rotating the screw body 7 in reverse unless the rod member 8 is removed. Here, the rod member 8 is driven by a hammer and screwed. In the case where the head 7 of the main body 7 does not protrude from the outer surface, the rod 8 cannot be removed, and the screw main body 7 cannot be substantially removed.

FIG. 6, FIG. 9 and FIG. 10 show another embodiment of the present invention. In this embodiment, the hole 4 formed from the outer surface of the head 3 to the tip of the screw rod 1 is a screw hole 4a, the rod 8 is a screw rod 8a, and the rod 8 is rotated to the rear end. An operation unit 9 is provided. As the rotation operation portion 9 provided on the rod member 8, for example, a + or − groove is provided so that the driver can easily perform the rotation operation. In addition to the driver groove, hexagonal holes or quadrangular holes may be formed so that they can be rotated by a wrench.

The mounting of each of the above embodiments will now be described with reference to the embodiment shown in FIG. 6. When inserting the rod member 8 into the hole 4, as shown in FIGS. 7 (a) and 8 (a). The screw rod portion 1 of the screw tool main body 7 is inserted into the hole 11 of the mounted object 10 in the same manner as in the embodiment of FIG. 2A or FIG. The male screw portion 1a of 1 is screwed into the screw hole 13 of the attachment 12 to perform the first-stage attachment, and then, as shown in FIG. 7B and FIG. By rotating the rod 8a by operating the rotation operating portion 9 and screwing it into the screw hole 4a which is the hole 4 of the screw rod portion 1, the small diameter portion 4'is expanded by the screwing of the screw rod portion 1. As shown in the arrow B, the portion 6 is expanded to the outside so as to be pressed against the inner wall of the screw hole 13 or the rear end edge of the screw hole 13 to attach the latter stage. To completion. Also in this embodiment, it is possible to prevent the screw engagement of the screw main body 7 from loosening. Further, once attached, the screw body 7 cannot be removed unless the rod 8 is removed, even if the screw body 7 is rotated in reverse. Therefore, it is possible to prevent the screw tool body 7 from being accidentally removed. Further, even if the screw tool main body 7 is to be removed by mischief, the screw tool main body 7 can be removed only after removing the rod member 8. Therefore, it is a troublesome operation to remove the screw tool main body, and it is difficult to mischief. Become. On the other hand, it is a little troublesome to remove the screw tool main body 7, but first, the rotation operation portion 9 provided at the end of the screw rod 8a that is the rod member 8 is rotated by a commonly used screwdriver or wrench. Then, the rotary operation part 2 provided on the head 3 of the screw tool main body 7 is removed by using a general rotary operation jig for operating a screw tool such as a spanner, a wrench, or a screwdriver. It can be removed by rotating it. In this case, screw rod 8
Since a is removed, when the rotation operating portion 9 provided on the head 3 of the screw body 7 is rotated in the opposite direction using a general jig for operating the screw tool such as a spanner, a wrench, a screwdriver, etc. When the male screw portion 1a of the screw rod portion 1 of the main body 7 rotates in the opposite direction to the screw hole 13, the spreading piece 6 that is pressed against the inner wall of the hole 13 and the rear end edge of the hole 4 is screwed into the screw hole 13. It is possible to remove the screw tool body 7 by moving the screw tool body 7 while rotating it.

[0017]

As described above, according to the present invention, a head having a rotary operation portion is provided at the rear end of the screw rod, and a hole is formed from the outer surface of the head to the tip of the screw rod. Drill a hole, reduce the inner diameter on the tip side of the screw rod portion of the hole, form a split groove from the tip portion of the screw rod portion, divide at least the tip portion of the screw rod portion into a plurality in the circumferential direction, and expand each. Since the screw tool main body is configured as one piece, the rod of the screw tool main body is provided with a rod member that can be inserted into the hole on the outer surface of the head and has a diameter larger than that of the reduced diameter portion of the tip of the hole. When installing the screw tool body, rotate the rotary operation part of the head of the screw tool body using a generally used rotary operation jig such as a wrench, wrench, or screwdriver, and attach it in the same manner as before. This way, the screw body can be fixed at the same time as normal fixing by screwing the screw rod part in this way. The spread of the tip of the threaded rod is firmly fixed by pressure contact with the inner wall of the threaded hole of the mounting member of the mounting piece and the rear edge of the threaded hole to prevent the threaded rod body from loosening and to prevent accidental or mischief. There is no risk of the screw rod body being removed with.

Further, in the case where the hole is a screw hole, the rod member is a screw rod, and the rotation operation portion is provided at the rear end portion of the rod member, the loosening after the screw tool body is attached as described above. Although it is difficult to remove the screw rod body accidentally or by mischief, it is necessary to remove the screw tool body by rotating the rotating operation part of the rod material with a wrench or a screwdriver. It is possible to remove the screw tool body by removing the screw tool body and then rotating the rotary operation part of the head part of the screw tool body using a rotary operation jig such as a wrench, a wrench, or a screwdriver.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an example of a usage state of the same as above, in which (a) is a cross-sectional view showing a first-stage mounting of the screw tool main body;
[Fig. 6] is a cross-sectional view showing a main fixing with a rod.

FIG. 3 shows an example showing another usage state of the above, (a)
FIG. 6 is a cross-sectional view showing the first-stage mounting of the screw tool main body,
(B) is a cross-sectional view showing the main fixing with a rod.

FIG. 4 is an exploded perspective view of another embodiment of the present invention.

FIG. 5 is an exploded perspective view of still another embodiment of the same.

FIG. 6 is an exploded perspective view of still another embodiment of the above.

FIG. 7 is a cross-sectional view showing an example of a usage state of the above, wherein (a) is a cross-sectional view showing a first stage mounting of the screw tool main body;
[Fig. 6] is a cross-sectional view showing a main fixing with a rod.

FIG. 8 shows an example showing another usage state of the above, (a)
FIG. 6 is a cross-sectional view showing the first-stage mounting of the screw tool main body,
(B) is a cross-sectional view showing the main fixing with a rod.

FIG. 9 is an exploded perspective view of another embodiment of the present invention.

FIG. 10 is an exploded perspective view of still another embodiment of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screw rod part 2 Rotating operation part 3 Head part 4 Hole 4a Screw hole 5 Split groove 6 Spreading piece part 7 Screw tool body 8 Bar material 8a Screw rod 9 Rotating operation part

Claims (2)

[Claims] 1. A head provided with a rotation operating portion is provided at the rear end of the screw rod, and a hole is bored from the outer surface of the head to the tip of the screw rod, and the tip of the screw rod of the hole is formed. The inner diameter of the side is reduced, and a split groove is formed from the tip of the threaded rod to divide at least the tip of the threaded rod into a plurality of parts in the circumferential direction to form the threaded tool body as spreading pieces, respectively. A screw tool characterized by comprising a rod member which can be inserted into an opening of an outer surface of a head into a hole of a main body and has a diameter larger than that of a portion having a reduced diameter at a tip portion of the hole. 2. The screw tool according to claim 1, wherein the hole is a screw hole, the rod is a screw rod, and a rotary operation portion is provided at a rear end portion of the rod.