JP2012047215A - Washer with slack detection function, and securing implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a securing implement relating to a washer or the combination of a screw and the washer capable of confirming and detecting the slack of the screw after securing.SOLUTION: The washer 20 is formed of a metal spring material, a through-hole 25 through which the shaft part 11 of the screw 10 is threaded is arranged in the general central part of the bottom surface 21 and of the same, the four covering pieces 23 are formed in the periphery of the bottom surface 21, and the curved parts are arranged in the connections 22 of the respective covering pieces 23 and the bottom surface 21, thereby the bottom surface 21 is held at the predetermined height position. Thereby, by securing the screw 10, the backside of the screw head pushes the bottom surface 21, the front ends of the covering pieces 23 are gathered and cover the head 13 of the screw 10. Alternatively, the surface of the head 13 of the screw 10 is colored, the front ends of the covering pieces 23 are opened when the securing of the screw 10 slacks, the slack of the securing implement can be detected by visually perceiving the colored part of the screw 10.

Description

  The present invention relates to a locking washer used for a screw such as various bolts and nuts, and a set of fasteners including the washer and the screw, and more particularly to a device capable of detecting the loosening when the screw is loosened. .

Examples of conventional fasteners include those disclosed in the following patent documents.
The device described in Patent Document 1 prevents the head of the bolt and nut from being gripped by a tool, and prevents the bolt and nut from being easily removed from the fastener.
Its structure is to cover the bolt head or nut with a security cover that runs idle, and as an example of this security cover, it has a cylindrical shape and is provided with a protruding portion protruding inward at one end thereof. The projecting portion is loosely fitted in, for example, an annular groove at the lower end of the locking nut, and then the other end side of the cylindrical body is crimped to the locking nut side to cover the locking nut.
As a result, the crime prevention cover is idled while covering the locking nut on the outside of the locking nut, and the locking nut or the like cannot be easily removed even by a tool.

  The one described in Patent Document 2 is a fastening tool composed of a pin with a wing and a washer with a protective wing, and this washer has a function of locking with the pin and at the tip end side of the shaft portion of the pin (opposite to the head). A wing capable of covering the side) is provided to protect the protrusion or protrusion at the tip of the shaft.

JP 2000-39012 A Utility Model Registration No. 3119070

In the above conventional fasteners, one of them covers the head and nut of the bolt to prevent the removal of the bolt and nut, and the other is the shaft portion of the pin of the fastener that is a stopper. It covered the tip and protected the protrusion.
In the present invention, first of all, in a washer used for a screw such as a bolt and a nut, and a fastener relating to the combination of this washer and a screw, after fixing an article to be fixed, the screw such as a bolt or a nut The problem is to be able to confirm the looseness and to detect and detect the looseness with the eyes.
Furthermore, it is also an object of the present invention to have a function of preventing theft and removal actions such that the tightened screws such as bolts and nuts become mischief and illegal acts.
In addition, it is a natural premise that the washer having the central role of performing the above function has a function of preventing loosening.

In order to solve the above-mentioned problems, a first aspect of the present invention is a washer that is used together with screws such as various bolts and nuts to prevent loosening. The washer is formed from a metal spring material, and its bottom surface portion. Is provided with a through hole through which the shaft portion of the screw is inserted, and at least one covering piece is provided on the periphery of the bottom surface portion. A curved portion or a connecting portion between the covering piece and the bottom surface portion is provided. By providing the folded portion, the bottom surface portion is held at a predetermined height position. By tightening screws such as various bolts and nuts, the back surface of the head of the screws such as bolts or the screws such as nuts. By pressing one of the surfaces of the washer against the bottom surface of the washer, the covering piece can be tilted in a direction to cover the head of a screw such as a bolt or a screw such as a nut, and the screw is loosened. In this case, the washer with a looseness detecting function is characterized in that the looseness of the screw can be detected by the covering piece moving in the direction opposite to the covering direction and the tilting angle of the inclined covering piece being increased. It is.
Here, the “tilt angle of the covering piece” means an angle formed by the bottom surface portion and the covering piece (the same applies hereinafter).

  According to a second aspect of the present invention, in a set of fasteners including screws and washers such as various bolts and nuts, the washer is formed from a metal spring material, and a screw is provided at a substantially central portion of the bottom surface portion. By providing a through hole through which the shaft portion is inserted, at least one covering piece is provided on the periphery of the bottom surface portion, and by providing a curved portion or a folded portion at a connection portion between the covering piece and the bottom surface portion, The bottom surface portion is held at a predetermined height position. By tightening screws such as various bolts and nuts, the back surface of the head of the screws such as bolts or one surface of the screws such as nuts is attached to the washer. By pressing the bottom surface portion, the covering piece can be tilted in a direction to cover the head of a screw such as a bolt or a screw such as a nut. When the screw is loosened, the covering piece Moves in the direction opposite to the coating direction. To, by tilting the angle of the cover strip which has been tilted is increased, a slack detection function fastener, characterized in that it is possible to detect the loosening of the screw.

According to a third aspect of the present invention, in a set of fasteners including screws and washers such as various bolts and nuts, the washer is formed from a metal spring material, and a screw is provided at a substantially central portion of the bottom surface portion. A through-hole through which the shaft portion is inserted is provided, and two or more covering pieces are provided on the periphery of the bottom portion,
By providing a curved portion or a folded portion at the connection portion between each covering piece and the bottom surface portion, the bottom surface portion is held at a predetermined height position, thereby fastening screws such as various bolts and nuts. The one end of the screw head such as a bolt presses the bottom surface of the washer with the back surface of the head of the screw such as a bolt, so that the tip of the covering piece covers the screw head such as the bolt or the screw such as a nut. The head of a screw such as a bolt or a screw such as a nut can be covered by tilting in the direction to which the screw is attached, and the other surface of the head of a screw such as a bolt or the other surface of a screw such as a nut is colored. Thus, when the fastening of the screw is loosened, the distal end portion of the covering piece spreads and the colored portion of the screw can be visually recognized, so that the looseness of the fastening tool can be detected. With looseness detection function It is a fastener.

  According to a fourth aspect of the present invention, in the second or third aspect of the invention, two of the covering pieces are provided at substantially opposite positions of the bottom surface portion, and the tip portions of the covering pieces are appropriately angled. Two folding parts are provided, and when the screws are fastened, the tips of the respective covering pieces tilt in the direction of covering the heads of the screws such as bolts or the screws such as the nuts, A fastener with a looseness detecting function, wherein the portion is overlapped with the bent portion of the other covering piece.

  According to a fifth aspect of the present invention, in the second or third aspect of the present invention, the respective tip portions of the covering pieces are notched to provide notches, the screws are fastened, and the tips of the respective covering portions are bolts. A slack detecting function-clamping device characterized in that, when tilted in a direction in which a screw head such as a nut or a screw such as a nut is covered, a shaft portion of the screw protrudes from between the notches. .

A first aspect of the present invention is a washer formed from a metal spring material used for preventing loosening by using together with screws such as various bolts and nuts, and a screw shaft is provided at a substantially central portion of the bottom surface portion. A through hole through which the portion is inserted, at least one covering piece is provided on the periphery of the bottom surface portion, and a curved portion or a folded portion is provided at a connecting portion between the covering piece and the bottom surface portion, whereby the bottom surface portion is Since it is held at a predetermined height position, by tightening screws such as various bolts and nuts, the back surface of the head of the bolts or one surface of the nut presses the bottom surface of the washer, so that the covering piece is screwed. When the screw is loosened, the tip of the covering piece is moved upward, and the coating that has been tilted is shifted to the direction of coating, that is, elastically deformed so as to tilt in the direction of covering the screw. The tilt angle of the piece is large It can be confirmed by eyes is the loosening of the screw can be easily detected.
Since the washer uses a metal spring material, it also has a function of preventing loosening.

  The second aspect of the present invention exhibits the same effect as the first aspect of the present invention, and is a set of fastenings in which the washer according to the first aspect of the present invention and screws such as various bolts and nuts are combined. It is specified as a tool.

In the third aspect of the present invention, there are various bolts, nuts and washers, various bolts and washers, or a fastener according to a combination of various nuts and washers. Alternatively, it is used by tightening with a tool such as an impact driver or a socket wrench with a washer under the nut.
Further, in the washer according to the present invention, a metal spring material is used as the material, and the curved portion or the folded portion is formed at the connection portion between the bottom portion and the two or more covering pieces provided on the periphery thereof, depending on the configuration. When a screw such as a bolt or nut is tightened with a tool, the bottom surface of the screw is pressed and the tip of each covering piece covers the head of the screw such as a bolt or the screw such as a nut. It tilts in the direction and elastically deforms to converge with each other.
As a result, the head portion of the bolt or the nut portion is covered with the covering piece.

On the other hand, when the screws such as bolts and nuts are loosened, the tip of the covering piece shifts in the direction opposite to the covering direction, and shifts from the previously focused state to the open state.
The bolt head surface or one surface of the nut is colored by applying a paint with a conspicuous color such as yellow or vermilion, and when the tip of the covering piece opens, the colored portion Therefore, it is possible to confirm and detect the looseness of screws such as bolts and nuts.

Furthermore, since the covering piece provided on the periphery of the bottom portion of the washer can cover the head of the bolt or the nut, a third party can loosen the bolt or nut or steal the bolt or nut. You can also defend from.
Of course, since the washer uses a metal spring material, it also has a function of preventing loosening.

In the fourth one of the present invention, two bent portions are provided at the tip of the covering piece, and each bent portion can be superimposed on the bent portion of the other covering piece. The screw head or nut can be completely covered.
In addition, when the screw or nut comes loose, it is possible to immediately check the opening of both covering pieces or the colored portion of the screw or nut because of the more complete covering at first.

In the fifth aspect of the present invention, by providing a notch portion at the tip of each covering piece, when the washer according to the present invention is disposed on the lower surface side of the nut, these notch portions are screw shafts. The part can be protruded to the outside.
That is, the washer according to the present invention can be disposed on the nut side and can cover the nut portion by avoiding the shaft portion regardless of the presence of the tip end portion of the screw shaft portion such as a bolt. is there.

The 1st Embodiment of the washer based on this invention is illustrated, The (A) is a perspective view, The (B) is a side view, The (C) is the side view of the state which fastened the volt | bolt. BRIEF DESCRIPTION OF THE DRAWINGS The 1st Embodiment of the fastener based on this invention is illustrated, The (A) is a development view of a washer, The (B) is a center longitudinal cross-section explanatory drawing of the washer before a deformation | transformation (normal state), The (C) is a central longitudinal cross-sectional explanatory view (left half view) of a state where the bolt and nut are fastened and the cover piece of the washer is deformed and converged, and (D) is a state where the cover piece of the washer is completely converged. (E) is a perspective view of a state just before the bolt and nut are completely fastened. It is a schematic diagram of 2nd Embodiment of the fastening tool which concerns on this invention, Comprising: The state fastened to a to-be-fastened member is sequentially illustrated by the (A) thru | or (E). The fastening tool which concerns on the 3rd Embodiment of this invention is shown, The (A) is a top view before fastening, The (B) is a front view before fastening, The (C) is after fastening FIG. It is a top view of the fastening state of the fastener concerning the 4th Embodiment of this invention. FIG. 10 shows a fastener according to a fifth embodiment of the present invention, in which (A) is a plan view in an intermediate fastening state, (B) is a front view in a fastening completion state, and (C) is a fastening member. It is a top view of a wearing completion state. FIG. 9 shows a fastener according to a sixth embodiment of the present invention, in which (A) is a plan view in an intermediate fastening state, (B) is a front view in a fastening completion state, and (C) is a fastening member. It is a top view of a wearing completion state.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 illustrates a first embodiment of a washer according to the present invention, in which (A) is a perspective view, (B) is a side view, and (C) is a side surface in a state where a bolt is fastened. FIG.
The washer 20 according to the first embodiment of the present invention is formed from a metal spring material. As shown in the perspective view (A) of FIG. It consists of a substantially rectangular covering portion 23 provided on one side, and a connecting portion 22 that connects the bottom surface portion 21 and the covering portion 23.

A through hole 25 through which the shaft portion 11 of the bolt 10 is inserted is formed in the center portion of the bottom surface portion 21.
The connection portion 22 is formed of a folded portion having a substantially U-shaped cross-section, as can be seen from FIG. 5B, and a leg portion 29 is provided on the side facing the connection portion 22, and these connections are made. By the portion 22 and the leg portion 29, the bottom surface portion 21 is maintained in a state separated from the horizontal plane h at a predetermined height position. FIG. (B) shows this state, that is, the state before deformation.

And when this washer 20 is arrange | positioned on the lower surface of the head 13 of the volt | bolt 10, and the axial part 11 is screwed together in to-be-fastened articles, as shown to (C) figure, the front-end | tip part of the covering piece 23 Tilts toward the head 13 of the bolt 10 and deforms so as to cover it.
On the other hand, when the fastening of the bolt 10 is loosened, the tip end portion of the covering piece 23 moves upward (in the direction of the arrow D) and is slightly opened.

Therefore, the slackness of the covering piece 23 can be detected by increasing the tilt angle.
If the slack is a little, the tilt angle is small, and if the slack is large, the tilt angle is also larger.
The operator can see this, detect looseness of screws such as bolts and nuts, and tighten them again using a tool.

Here, in this embodiment, the covering piece 23 is configured to cover the head portion 13 of the screw 10 almost completely. However, the covering piece 23 does not completely cover the screw head portion 13. Also good.
For example, when the screw 10 is completely tightened, the covering piece 23 is in an upright state, and when the screw 10 is loosened, the covering piece 23 is opened outward from the upright state, and is in an inclined oblique state. Thus, it may be possible to detect the looseness of the screw.
However, in the screw tightened state, it is preferable to place the washer covering piece as close as possible to the screw head side, that is, in the state of FIG. 1C from the viewpoint of safety. It is.
Moreover, in the bottom face part 21 of the said embodiment, it is also possible to implement without providing the leg part 29 in the opposing side in which the coating piece 23 was provided.

  FIG. 2 shows a first embodiment of a fastener with a looseness detection function according to the present invention, in which (A) is a developed view of the washer, and (B) is a washer before deformation (normal state). (C) is a center longitudinal section explanatory view (left half view) of a state where the bolt and nut are fastened and the cover pieces of the washer are deformed and converged, (D) ) Is a plan view showing a state where the cover pieces of the washer are completely converged, and FIG. 8E is a perspective view showing a state just before the bolt and nut are completely fastened.

The first embodiment according to the fastening tool of the present invention is composed of three components: a bolt 10, a nut 12, and a washer 20.
The washer 20 is formed from a metal spring material. As shown in the development (A), the washer 20 has a substantially square bottom surface portion 21 at the center and substantially triangular shapes provided on each side of the bottom surface portion 21. It consists of four covering parts 23 and a connecting part 22 that connects these bottom face part 21 and covering part 23.

A through hole 25 through which the shaft portion 11 of the bolt 10 is inserted is formed in the center portion of the bottom surface portion 21.
As can be seen from FIG. 5B, the connecting portion 22 is curved in cross-section and connects the bottom surface portion 21 and the covering piece 23, and the bottom surface portion 21 is in a state before the bolt 10 and the nut 12 are tightened. That is, in the state shown in FIG. 5B before the deformation, it is located in a state separated from the horizontal plane h.

When this washer 20 is arranged on the lower surface of the head portion 13 of the bolt 10 and the nut 12 is screwed with the article to be fastened interposed in the shaft portion 11, as shown in FIG. The tip portion of 23 is inclined toward the head portion 13 of the bolt 10 and is deformed so as to cover it.
When the nut 12 and the bolt 10 are almost completely screwed together, as shown in FIG. (D), the tips of the four covering pieces 23, 23,... Converge and the bolt head is hidden.
A colored paint such as yellow is applied to the surface of the head 13 of the bolt 10.
In the present invention, it is possible to carry out without coloring.

(E) In the state of the figure, the bolt 10 and the nut 12 are not completely screwed yet, and a state just before that is shown.
(D) In the state shown in the figure, the respective covering pieces 23 converge to each other so that the surface of the bolt head is almost completely hidden, and the colored portion due to the paint applied to the surface is not visible.
When the bolts and nuts are loosened, the end portions of the respective covering pieces 23 are slightly opened. Therefore, the bolt head surface is colored diagonally in the plan view of FIG. For example, a yellow colored portion can be visually recognized, and the looseness can be detected.

If it is a little loose, the yellow X on the diagonal appears as a thin line, and as the looseness increases, the yellow X line appears thick.
The operator can look at this and confirm the looseness of the bolts and nuts and tighten them again with a tool, or replace the washer with a new one and tighten again.

FIG. 3 is a schematic diagram sequentially illustrating a state in which a fastening tool including a screw and a washer according to the second embodiment of the present invention is fastened to a fastened member.
In FIG. 2A, the screw 10 is screwed into a screw hole 51 provided in the fastened member 50. At this time, the washer 20 is interposed in advance. The washer 20 is the same as that shown in FIG.
The surface of the head 13 of the screw 10 is colored similarly to the above embodiment.

FIG. 2B shows a state in which the tip of the driver bit D attached to the electric screwdriver is engaged with the engaging groove portion of the head of the screw 10.
(C) In the figure, as the screw 10 is tightened by rotating the driver bit D, the tip of the covering piece 23 of the washer 20 tilts and converges. Yes.

FIG. 4D shows a state in which the screw 10 is further tightened and completely tightened, but the driver bit D has not yet been detached from the head of the screw 10.
FIG. 5E shows a state in which the driver bit D of the electric screwdriver is detached from the head of the screw 10 and also detached from the covering piece 23 of the washer 20. However, the driver bit D is pulled out of the washer 20. When removed, the covering piece 23 of the washer 20 returns to its original shape due to its own elasticity, and completely covers the head of the screw 10.

In the fastener according to the second embodiment shown in the schematic diagram of FIG. 3, no nut is used, and the screw 10 is screwed into the screw hole 51 of the fastening member 50. The fastening tool is composed of two components, the screw 10 and the washer 20.
Also in this case, when the screw 10 comes loose, the tip of the covering piece 23 opens, and a colored portion such as vermilion colored on the surface of the screw head is visually recognized, and the looseness can be detected. It can be done.

FIG. 4 shows a third embodiment according to the fastener of the present invention, in which (A) is a plan view before fastening, (B) is a front view before fastening, and (C). Is a plan view after fastening.
In the third embodiment, the bolt 10, a nut (not shown), and a washer 20 are included.
Although the developed view of the washer 20 according to the third embodiment is not shown, the plan view of the developed view has a substantially rectangular shape.

Both ends of this substantially rectangular metal spring material are erected at substantially right angles to form covering pieces 23 and 23, and the bottom surface 21 is curved so that the substantially central portion bulges upward. The connecting portions 22 and 22 at both ends of the portion 21 are formed into a curved shape.
Therefore, as can be seen from FIG. 5B, the bottom surface portion 21 is separated from the horizontal plane h in a state before the deformation.

A through hole 25 in the shaft portion of the bolt 10 is provided in the center portion of the bottom surface portion 21. By tightening the bolt 10 and the nut, the bottom surface portion 21 is deformed into a flat shape. , 23 are tilted toward the bolt head and converged.
At the front end of the covering piece 23, bent portions 26, 26, 27, and 27 having substantially the same shape that are bent inward are provided.
The bent portions 26 and 27 are obtained by bending both corners of the upper end portion of the covering portion 23 into a triangle.

When the bolt 10 is tightened, the covering pieces 23 and 23 come close to each other so that their tip portions come close to each other, and the bent portions 26 and 26 are bent when the pieces are converged. It converges so that it may overlap with the upper surface of 27 and 27, or the lower surface.
Alternatively, in FIG. 6A, the upper part of the bent part 26 is superimposed on the upper surface of the bent part 27, and the lower part of the bent part 26 is superimposed on the lower surface of the bent part 27 so as to overlap. It is also possible to do this ((C) state shown in the figure).

The manner of superimposing is arbitrary, but the overlapping of the bent portions 26 and 27 in this way makes the covering portions 23 and 23 converge more closely and no gap is generated.
Thereby, the covering piece 23 can cover the head of the bolt more completely, and when the bolt is loosened, the colored portion on the surface of the head 13 of the bolt 10 can be immediately recognized. is there.

FIG. 5 is a plan view of a fastening state of the fastening tool according to the fourth embodiment of the fastening tool of the present invention.
Similarly to the fastening tool according to the first embodiment, this fastening tool also includes a bolt, a nut 12 and a washer 20 which do not appear in the drawing.
The washer 20 used here is the same as that used in the fastener of the first embodiment. In this washer, the tip of each of the four covering pieces 23 is connected to each side of the bottom portion. It has a cutout portion 23k cut out substantially in parallel.

When the bolts and nuts 12 are fastened and the four covering pieces 23 are converged, the notches 23k have a substantially square shape in plan view and form a substantially square hole.
The shaft portion 11 of the bolt can project out of the washer 20 from the substantially square hole.
The surface of the nut 12 on the front side of the drawing is colored, and when the tightening is loosened, the covering piece 23 converges, the area of the colored portion of the nut 12 becomes larger, and the screw Looseness can be visually recognized.

In the fourth embodiment, even when the covering pieces are completely converged, the colored surface of the nut 12 can be seen from the outside to some extent, but the visible colored portion becomes larger, thereby confirming the looseness of the screw. It is something that can be done.
Thus, in the present invention, the washer can be implemented as a fastener disposed on the side of the nut, and further, when used for a planting bolt or the like, the washer is a tightening tool related to the combination of the nut and washer. It can also be implemented as a fitting, and the washer can be placed on both the bottom surface of the bolt and the bottom surface on the side of the nut. In this case, the combination of the screw of the bolt and nut and two washers is used. It can be implemented as such a fastener.

FIG. 6 shows a fifth embodiment according to the fastening tool of the present invention, in which (A) is a plan view of a fastening intermediate state, (B) is a front view of a fastening completion state, ( C) is a plan view of a fastening completion state.
In the fifth embodiment, as in the fourth embodiment, a washer 20 is disposed on the nut 12 side to cover the nut 12.

And the shape of the washer 20 is not provided with the bent portion of the covering piece of the third embodiment (FIG. 4), but is provided with a substantially rectangular cutout portion 23k, 23k at the tip of the covering piece 23. Is.
As a result, by tightening the bolt 10 and the nut 12 which are fastening members, the bottom surface portion 21 of the washer 20 is pressed, and the two opposing covering pieces 23 and 23 are tilted toward the nut side and converge to each other. Then, the nut 12 is covered.
At that time, due to the presence of the notches 23k and 23k, the shafts 11 of the bolt 10 can be avoided, and the tips of the covering pieces 23 and 23 can converge to cover the nut 12.

Also in this embodiment, as in the fourth embodiment, even when the covering piece 23 of the washer 20 covers the nut 12 almost completely, the surface 14 of the colored nut 12 is slightly visible ( (C) FIG.
Therefore, also in the fifth embodiment, as in the fourth embodiment, it is possible to check and detect the loosening of the screw tightening according to the size of the visible range of the colored portion.

FIG. 7 shows a sixth embodiment according to the fastening tool of the present invention, in which (A) is a plan view of a fastening intermediate state, (B) is a front view of a fastening completion state, ( C) is a plan view of a fastening completion state.
In the sixth embodiment, the washer 20 is disposed on the nut 12 side to cover the nut 12 in the same manner as the fifth embodiment.

And the washer used here differs in the shape and position of the notch part of the covering piece of the washer which concerns on the said 5th Embodiment (FIG. 6).
That is, in the sixth embodiment, substantially symmetrical arc-shaped cutouts 23k and 23k are provided at the centers of the tip portions of the two opposing covering pieces 23 and 23.
Thereby, by tightening the bolt 10 and the nut 12 which are the fastening portions, the bottom surface portion 21 of the washer 20 is pressed, and the two opposing covering pieces 23 and 23 are tilted toward the nut side and converged, The nut 12 is covered.
At that time, due to the presence of the notches 23k and 23k, the shaft portion 11 of the bolt 10 can be avoided and the tip portions of the covering pieces 23 and 23 can converge to cover the nut 12.

Also in this embodiment, as in the fifth embodiment, even when the covering piece 23 of the washer 20 covers the nut 12 almost completely, the colored surface 14 of the nut 12 can be seen a little ( (C) FIG.
Accordingly, also in the sixth embodiment, as in the fifth embodiment, it is possible to check and detect the loosening of the screw tightening according to the size of the visible range of the colored portion.

Although the embodiment has been described above, various design changes can be made in the present invention as follows.
First, the present invention relates to a washer or a fastener having a combination of a washer and a screw, and in the fastener, a combination of a bolt / nut and washer, a bolt and washer, or a nut and washer. It is a set of fasteners according to the above, and relates to various combinations of screws and washers.
The characteristic part is a washer shape or a colored part provided on the surface of the bolt head or one of the nuts, and other configurations can be freely changed in design.

It does not matter what method is used for coloring the bolt head surface or one side of the nut.
It may be a baked coating of various paints, may be applied directly, or may be a sticker on which one surface is colored.
The shape of the washer can be designed completely freely, and the number of covering pieces may be at least one, or may be two or more. As in the above embodiment, the number is one, two, or four. Regardless, the design can be changed to 3, 6, 8, etc.
The shape of the covering piece can also be a shape other than a substantially rectangular shape or a triangular shape, and the shape of the bottom surface can also be designed freely.

In the washer in the fastener according to the third embodiment, the number of the bent portions provided on the covering piece may not be two each, and each one may be provided on the covering piece. .
The shape of the connecting portion that connects the bottom portion of the washer and the covering piece is also free, and it may be a simple folded portion other than the curved portion. In short, the shape of the washer before the deformation is determined by the shape of the connecting portion. When it is placed on a flat surface with the bottom face down, it is placed upwards while maintaining a predetermined height, and when this bottom face is pressed by tightening the screw, the covering part is attached to the bolt head or nut, etc. Anything that can be tilted in the covering direction is acceptable.

Moreover, the shape of the notch provided in the covering piece can be freely changed in design as appropriate.
The type of screw is also arbitrary, and a square bolt other than a hexagonal bolt having a hexagonal head may be used, or other various types of screws may be used.
As for the nut, various kinds of existing nuts can be used.
As described above, the present invention can provide a washer and a fastener that can easily detect looseness of a screw by the shape of the washer and its elastic deformation or coloring applied to the surface of the screw head.

10 Bolt 11 Shaft (Bolt)
13 Head (bolt)
14 Surface (of the nut)
20 Washer 21 Bottom part 22 Connection part 23 Covering piece 23k Notch part 25 Through hole 26, 27 Bending part

Claims (5)

In the washer that is used together with screws such as various bolts and nuts to prevent loosening,
The washer (20) is formed from a metal spring material, and a through hole (25) through which the shaft (11) of the screw (10) is inserted is provided at a substantially central portion of the bottom surface portion (21). At least one covering piece (23) is provided on the periphery of the portion (21),
By providing a curved portion or a folded portion at the connecting portion (22) between the covering piece (23) and the bottom surface portion (21), the bottom surface portion (21) is held at a predetermined height position.
As a result, by tightening screws (10, 12) such as various bolts and nuts, the back surface of the head of the screws (10) such as bolts or one surface of the screws (12) such as nuts is attached to the washer (20). By pressing the bottom surface portion (21), the covering piece (23) can be tilted in the direction of covering the head of the screw (10) such as a bolt or the screw (12) such as a nut,
When the tightening of the screws (10, 12) is loosened, the covering piece (23) shifts in the direction opposite to the covering direction, and the tilt angle of the inclined covering piece (23) is increased. A washer with a looseness detection function, characterized by being able to detect looseness of the screws (10, 12). In a set of fasteners consisting of screws and washers such as various bolts and nuts,
The washer (20) is formed from a metal spring material, and a through hole (25) through which the shaft portion (11) of the screw (10) is inserted is provided at a substantially central portion of the bottom surface portion (21). At least one covering piece (23) is provided on the periphery of the portion (21),
By providing a curved portion or a folded portion at the connecting portion (22) between the covering piece (23) and the bottom surface portion (21), the bottom surface portion (21) is held at a predetermined height position.
As a result, by tightening screws (10, 12) such as various bolts and nuts, the back surface of the head of the screws (10) such as bolts or one surface of the screws (12) such as nuts is attached to the washer (20). By pressing the bottom surface portion (21), the covering piece (23) can be tilted in the direction of covering the head of the screw (10) such as a bolt or the screw (12) such as a nut,
When the tightening of the screws (10, 12) is loosened, the covering piece (23) shifts in the direction opposite to the covering direction, and the tilt angle of the inclined covering piece (23) is increased. A fastener with a looseness detecting function, characterized by being capable of detecting looseness of a screw. In a set of fasteners consisting of screws and washers such as various bolts and nuts,
The washer (20) is formed from a metal spring material, and a through hole (25) through which the shaft portion (11) of the screw (10) is inserted is provided at a substantially central portion of the bottom surface portion (21). Two or more covering pieces (23) are provided on the periphery of the portion (21),
By providing a curved portion or a folded portion at the connecting portion (22) between each covering piece (23) and the bottom surface portion (21), the bottom surface portion (21) is held at a predetermined height position.
As a result, by tightening screws (10, 12) such as various bolts and nuts, the back surface of the head of the screws (10) such as bolts or one surface of the screws (12) such as nuts is attached to the washer (20). By pressing the bottom surface portion (21), the tip of the covering piece (23) tilts in a direction to cover the head of the screw (10) such as a bolt or the screw (12) such as a nut, and the screw such as a bolt. (10) the head or a screw (12) such as a nut can be covered,
On the other hand, the screw (10, 12) is fastened by coloring the surface of the head (13) of the screw (10) such as a bolt or the other surface (14) of the screw (12) such as a nut. When loosened, the tip of the covering piece (23) spreads out and the colored portion of the screw (10, 12) can be visually recognized, so that loosening of the fastener can be detected. Fastener with looseness detection function.   Two covering pieces (23) are provided at substantially opposite positions of the bottom surface portion (21) opposite to each other, and two bent portions (26, 26, 26, 26, 26, 27, 27) are provided, and when the screws (10, 12) are fastened, the tips of the covering pieces (23) cover the heads of the screws (10) such as bolts or the screws (12) such as nuts. The bent portions (26, 26) of the respective covering pieces (23) are overlapped with the bent portions (27, 27) of the other covering pieces (23) by tilting in the direction. The fastener with a loosening detection function according to 2 or 3.   Each of the covering pieces (23) is cut out at the respective tip portions to provide cutout portions (23k), the screws (10, 12) are fastened, and the tips of the respective covering portions (23) are screws such as bolts (10 ) That the shaft (11) of the screw (10) protrudes from between the notches (12k, 12k) when tilted in the direction of covering the screw (12) such as a head or a nut. The fastener with a looseness detection function according to claim 2 or 3,