JP3232830U - Screws with a tightened display function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screw having a tightened display function capable of quickly and easily visually confirming that the screw has been tightened. SOLUTION: A screw main body 1 having a head 2 having a square hole 3 for fitting a screw tightening tool in the center of the upper surface, and a screw tightening tool capable of fitting into the square hole 3 of the head 2 and in the center of the upper surface. It is composed of a square fitting portion 4a in which a fitting square recess 4b is formed, and a cap 4 for tightened display including a flange portion 4c integrally extending outward in the radial direction from the upper end of the square fitting portion 4a. The cap 4 is held in contact with the upper surface of the head 2, and when pressed through the square recess 4b by a tightening tool fitted into the square hole 3 during screw tightening, the entire cap 4 is pressed. It is made of an elastomer resin material so that it can be pushed into the inner part of the square hole 3. [Selection diagram] Fig. 1

Description

The present invention relates to a screw used for fastening members to each other, and particularly to a screw having a tightened display function so that it can be seen at a glance that the screw has been tightened.

Conventionally, in fields such as construction and machine manufacturing, a large number of screws such as bolts and screws have been used for fastening members to each other. In that case, in order to prevent forgetting to tighten the screw, after tightening the screw, a paint is applied to the head of the screw or the like to serve as a mark indicating that the tightening is completed. By doing so, it becomes clear to distinguish the screws from the screws that have not been tightened yet, so that it is possible to reliably prevent forgetting to tighten the screws even in a field where a large number of screws are used.

However, in the above case, in addition to the screw tightening work, the work of applying paint to the screw is required, which requires a lot of work, which increases the construction work cost and the machine manufacturing cost. It was a factor.

Therefore, as a means for solving the above-mentioned problems, the applicant has previously proposed and filed a screw having a tightened display function.
The screw having the tightened display function is a screw having a head having a square hole for fitting a screw tightening tool in the center of the upper surface, and a shaft-shaped protrusion is a square hole at the center of the square hole of the head. A thin plate body for displaying tightened is used while being provided in the axial direction from the bottom surface, and the thin plate body rises higher than the bottom surface of the square hole by inserting the protrusion into the hole provided in the center thereof. While the position is held in the state, when the thin plate body is pressed by the tightening tool fitted into the square hole at the time of screw tightening, it is punched out by the protrusion and pushed into the bottom surface of the square hole. It is a thing.
Then, according to this screw with a tightened display function, by inserting the tightening tool into the square hole of the screw head and tightening the screw, the thin plate body is pushed from the upper part of the square hole to the bottom surface. It is possible to visually confirm that the screws have been tightened due to the change in movement.

Utility model registration No. 3019023

However, in the case of the screw having the tightened display function described above, it is necessary to specially project a shaft-shaped protrusion at the center of the square hole of the screw head, and the protrusion is also located at the center of the tip of the tightening tool. It is necessary to specially form a recess for insertion, which makes the structure of both the screw and the tightening tool complicated and the overall cost is high. In addition, since the thin plate body is held by simply inserting the tip of the protrusion into the hole provided in the center of the thin plate body, the thin plate body becomes the protrusion when some external force is applied to the outer peripheral portion of the thin plate body. In addition, the flat thin plate is located at the upper part of the square hole so as to hide the mouth of the polygon, so the tightening tool can be fitted into the square hole. Was difficult to do. Moreover, after tightening the screws, the entire thin plate body is pushed to the bottom surface of the square hole in a flat state, so when viewed from an oblique direction rather than from the front, the thin plate body located on the bottom surface of the square hole. There was also a phenomenon that it was difficult to confirm.

Therefore, the present invention has been devised in order to solve the above-mentioned conventional drawbacks, and is to insert a shaft-shaped protrusion provided in the square hole of the head of the screw or a protrusion provided in the center of the tip of the tightening tool. In addition to eliminating the need for recesses, a cap for displaying tightened can be made, and this cap can be attached to the upper surface of the square hole of the head before using the screw, and it is a tightening tool. When inserting the tightening tool into the square hole of the head, the entire cap can be inserted into the inner part of the square hole together with the tightening tool, and when the tightening tool is pulled out from the square hole of the screw head, The cap is left in the back of the square hole in a bottomed tubular shape and is pushed in three-dimensionally, so that it can be easily visually confirmed not only from the front but also from an oblique direction and tightened. An object of the present invention is to provide a screw having a tightened display function that can be seen to have been completed.

The device according to claim 1 of the present application is a screw body 1 having a head portion 2 having a square hole 3 for fitting a screw tightening tool in the center of the upper surface, and a top surface capable of being fitted into the square hole 3 of the head portion 2. For a tightened display, which includes a square fitting portion 4a in which a square recess 4b for fitting a screw tightening tool is formed in the center, and a flange portion 4c integrally extending outward in the radial direction from the upper end of the square fitting portion 4a. The cap 4 is composed of a cap 4, and the square fitting portion 4a is fitted into the square hole 3 of the screw head 2 so that the flange portion 4c is held in contact with the upper surface of the screw head 2. When the cap 4 is pressed through the corner recess 4b by the tightening tool 20 fitted into the square hole 3 at the time of screw tightening, the entire cap 4 can be pushed into the inner part of the square hole 3. It is characterized in that it is formed of an elastomer resin material so as to be.

According to the screw having the tightened display function of the present invention, the shaft-shaped protrusion provided in the square hole of the screw head and the center of the tip of the tightening tool are formed by the above configuration. The recess for inserting the protrusion can be eliminated, and the cap 4 for displaying the tightened portion is used, and the cap 4 is used as a square hole in the upper surface portion of the square hole 3 of the screw head 2 before the screw is used. It can be mounted and placed by fitting to 3, and when the tightening tool 20 is inserted into the square hole 3 of the head 2, the entire cap is inserted into the square hole 3 together with the tightening tool 20. It can be inserted into the portion, and when the tightening tool 20 is pulled out from the square hole 3 of the head 2, the cap remains pressed into the inner part of the square hole 2 in a bottomed tubular shape in a three-dimensional manner. It can be seen that the screws have been tightened so that they can be visually confirmed quickly and easily not only when viewed from the front but also when viewed from an oblique direction.

It is a central vertical sectional view when this invention is carried out as a bolt. It is a top view of FIG. It is a front view of a cap. It is a side view of a cap. It is a bottom view of a cap. It is a partial vertical sectional view which shows the tightening state of a bolt. It is a top view when the present invention is carried out as a countersunk head type screw. It is a top view when this invention is carried out as a round head type screw.

Hereinafter, an example of a screw having a tightened display function according to the present invention will be described with reference to the drawings.

1 to 6 show a case where the screw with a tightening display function according to the present invention is formed as a bolt A, in which 1 is the bolt body (screw body), and a screw groove 1a is formed on the outer periphery over almost the entire length. There is. Reference numeral 2 denotes a head provided on the upper portion of the bolt body 1, and the outer peripheral surface is formed in a circular shape. Reference numeral 3 denotes a square hole for fitting a screw tightening tool provided in the center of the upper surface of the head 2, and although a hexagonal shape is shown in the figure, it may be formed into another polygonal shape.

Reference numeral 4 denotes a square fitting portion 4a having a hexagonal shape that can be fitted into the square hole 3 of the head portion 2 and having a square recess 4b for fitting a screw tightening tool formed in the center of the upper surface, and a square fitting portion 4a. It is a cap for tightened display of a cross-sectional view reverse hat type provided with a flange portion 4c integrally extending outward from the upper end in the radial direction. As shown in FIG. 1, the cap 4 is held in a state where the flange portion 4b is in contact with the upper surface of the head 2 by fitting the square fitting portion 4a into the square hole 3 of the head 2 in the bolt A. To. When the cap 4 is pressed through the square recess 4b by the tightening tool 20 fitted into the square hole 3 during screw tightening, the entire cap 4 can be pushed into the inner portion of the square hole 3. As described above, it is made of an elastomer resin material. That is, when the square fitting portion 4a is pressed by the tightening tool 20, the concave fitting portion 4a and the flange portion 4b following the concave fitting portion 4a move to the bottom surface portion at the back of the square hole 3 and the inner side surface portion around the bottom surface. It is made of an elastomer resin material so that it can be pushed in.

Further, the cap 4 may be used in a color different from that of the bolt A, for example, yellow. Here, the elastomer resin material has properties that it is easy to mold, is soft even after molding, and is excellent in coloring.
In the embodiment shown in the figure, the wall thickness of the square tube portion in the square fitting portion 4a is formed to be thicker than the wall thickness of the bottom portion and the flange portion 4c, and the shape of the square fitting portion 4a is always appropriate. It is designed to be retained. Further, the shape of the flange portion 4c is not limited to the disk shape as in the embodiment, and may be appropriately changed according to the shape of the screw to be used. Further, for example, a slit groove extending radially from the center of the collar portion 4c may be appropriately formed so as to be more easily deformed.

Next, the operation of the bolt A will be described.

For example, in order to fasten the two members 30 and 40 with the bolt A, as shown in FIG. 6, the bolt body 1 of the bolt A is inserted through the member 30 and screwed into the member 40, and then the bolt A is inserted. Tighten and fasten the members 30 and 40. In that case, the tightening tool 20 is aligned with the tool fitting square hole 4b of the concave fitting portion 4a and fitted into the tool fitting square hole 4b while being inserted into the tool fitting square hole 4b. As a result, the cap 4 is pressed by the tightening tool 20, and the entire concave fitting portion 4a and the subsequent flange portion 4b are three-dimensionally formed in the inner portion of the square hole 3 as shown in FIG. It will be pushed. Then, the bolt A is tightened in the pushed state.

Further, after tightening, even if the tightening tool 20 is pulled out from the square hole 3 and the cap 4, the cap 4 remains in the deep part of the square hole 3 in a bottomed tubular shape and is pushed in three-dimensionally. By visually checking the state, it can be seen that the bolt A has been tightened.
In particular, since the cap 4 is softly formed of an elastomer resin material, when the cap 4 is pressed by the tightening tool 20 via the concave fitting portion 4a, the cap 4 elastically deforms and fits in the concave shape. Since the joint portion 4a and the flange portion 4b following it are pushed into the bottom surface portion at the back of the square hole 3 and the inner side surface portion around the bottom surface in a three-dimensional shape with a bottomed cylinder, not only the front surface but also the diagonal portion. Even when visually confirmed from the direction, the cap 4 at the back of the square hole 3 can be visually confirmed more quickly and easily, and it can be seen that the tightening has been completed.

The tightening tool 20 used for tightening the bolt A may be an electric type as well as a manual type wrench shown in the figure. Further, as the tightening tool 20, a tool having a size that allows the cap 4 to be pushed into the inner portion of the square hole 3 as described above and that exerts the tightening function of the bolt A in the pushed state is used.

Further, in the above-described embodiment, the case where the screw of the present invention is configured as the bolt A has been described, but for example, it is configured as the countersunk head screw B shown in FIG. 6 or as the round head screw C shown in FIG. Of course, it can be carried out in the same way.

A Bolt B Countersunk head screw C Round head screw 1 Bolt body (screw body)
1a Thread groove 2 Head 3 Square hole 4 Tightened display cap 4a Concave fitting part 4b Tightening tool Fitting square hole 4c Brim part 20 Tightening tool

Claims (1)

A screw body 1 having a head 2 having a square hole 3 for fitting a screw tightening tool in the center of the upper surface, and a square recess for fitting a screw tightening tool that can be fitted into the square hole 3 of the head 2 The cap 4 is composed of a square fitting portion 4a on which 4b is formed and a cap 4 for tightened display including a flange portion 4c integrally extending radially outward from the upper end of the square fitting portion 4a. By fitting the square fitting portion 4a into the square hole 3 of the screw head 2, the flange portion 4c is held in contact with the upper surface of the screw head 2, and the cap 4 is held during screw tightening. When pressed through the square recess 4b by the tightening tool 20 fitted into the square hole 3, the entire cap 4 is formed of an elastomer resin material so that it can be pushed into the inner part of the square hole 3. A screw having a tightened display function, which is characterized by being tightened.

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