JP6744122B2 - Screws with washers - Google Patents

Description

The present invention relates to a washer, a washer set consisting of two washers, and a screw with a washer equipped with a washer on the root side of the back surface of the head of a screw such as a bolt or a nut. It can prevent loosening.

BACKGROUND ART Conventionally, as a washer or a screw with a washer provided with a locking mechanism, there is one previously filed by the applicant of the present application (Patent Document 1). This washer is provided with washer protrusions having a chevron shape in a side view in a radial shape on the front surface, and biting protrusions are provided on several points in the circumferential direction on the back surface. When this washer is set on the back side of the head of the screw and the screw is tightened, the head protrusion of the screw and the washer protrusion mesh (fit), the washer is tightened, and the bite protrusion bites into the object to be tightened. The loosening of screws is prevented. The screws with washers are set such that the washers do not come off on the root side of the back surface of the head of screws such as bolts and nuts.

JP, 2006-242324, A

Both the washer and the screw with washer of Patent Document 1 have an advantage that they are less likely to be loosened after tightening the screws, but both the head projection and the washer projection are chevron projections, and a large number of head projections are formed. In order to ensure that the projection and the washer projection fit together, the ridge-shaped projection and the die for molding the ridge-shaped projection require precise dimensional accuracy. Therefore, it was troublesome to form the chevron protrusion and to manufacture the mold.

A problem to be solved by the present invention is to facilitate the formation of chevron projections and the production of dies.

[Single washer]
The washer of the present invention is a washer that is used by setting one piece on the back surface side of the head of a bolt or a nut (hereinafter referred to as "screws"), and a single protrusion or a continuous ridge is provided on the washer surface. Alternatively, the continuous ridge is fitted to the continuous ridge on the back surface of the head of the screw or a single protrusion to prevent loosening. The washer of the present invention may be one in which a single protrusion is provided on the surface of the washer and the protrusion can bite into the back surface of the head of the screw to prevent loosening.

[Washer set]
The washer set of the present invention is a combination of an upper washer and a lower washer which are used by being set on the back side of the head of the screw. The upper washer and lower washer can be prevented from loosening by fitting a single protrusion provided on one side with a continuous ridge provided on the other side, and the upper washer and screws are provided with a single protrusion or continuous protrusion provided on one side. The ridge and the continuous ridge provided on the other side or a single protrusion are fitted to prevent loosening. The upper washer and the screws may be provided with a single protrusion on the surface of the upper washer, and the protrusion may bite into the back surface of the head of the screws to prevent loosening.

[Screws with a single washer]
The screw with washer of the present invention is set such that one washer does not fall out on the back side of the head of the screw, and the one washer is used as the washer to separate the washer surface. The protrusion or the continuous protrusion is fitted with the continuous protrusion on the back surface of the head of the screw or a single protrusion to prevent loosening. In this case, a single protrusion on the surface of the washer may bite into the back surface of the head of the screw to prevent loosening.

[Screws with two washers]
The screw with washer of the present invention is one in which two washers are set on the back side of the head of the screw so as not to fall off, and the washer set is used for the upper washer and the lower washer. Can be prevented from loosening by fitting a single protrusion provided on one side with a continuous ridge provided on the other side, and the upper washer and the screws can be provided on the other side with a single protrusion or continuous ridge provided on the other side. It is possible to prevent loosening by fitting with a continuous ridge provided or a single protrusion. The upper washer and the screws may be such that a single protrusion on the surface of the upper washer can bite into the back surface of the head of the screws to prevent loosening.

The washer of the present invention has the following effects.
(1) If the screws are set on the back side of the head of the screws and the screws are tightened, the screws and the washer are fitted together, so that the screws are prevented from loosening.
(2) When the washer or the head projection of the screw is a single projection, dimensional accuracy is not required unlike a continuous ridge, so press molding is easy, and a molding die is also easy to manufacture. , The single protrusion is not easily damaged during use.

The washer set of the present invention has the following effects.
If the two sets of washers are set on the screws, the loosening can be surely prevented by the double fitting of the fitting between the screws and the upper washer and the fitting between the washers.

The screw with one washer of the present invention has the following effects.
(1) No hassle of setting washers on screws.
(2) The loosening of the screws can be prevented by fitting the back surface of the head of the screw and the washer, or by engaging the single protrusion of the washer with the back surface of the head.

The screw with two washers of the present invention has the following effects.
(1) No hassle of setting washers on screws.
(2) Double loosening is achieved by fitting the upper washer and the lower washer together, fitting the screws and the upper washer, or engaging the protrusion of the upper washer with the back surface of the screw head. To be prevented.

It is an example of a combination in the case where the screw with washer of the present invention is a bolt and a single washer, (a) to (c) are explanatory views of examples of different bolts, and (d) to (f) are examples of different washers. FIG. FIG. 7 is a combination example of the case where the screw with washer of the present invention is a bolt and two washers, and (a) to (c) are explanatory views of examples of different bolts, (d), (e), and (f). (G), (h) and (i), (j) and (k), (l) and (m) are explanatory views of different combinations of two washers. (A) is a plan view showing an example of the continuous ridge in the present invention, (b) is a partial sectional view of the continuous ridge in (a), (c) is an explanatory view of a single protrusion in the present invention, (d) ) And (e) are perspective views of examples in which a single protrusion is different. It is an example when the screw with washer of the present invention is a bolt, (a) is an explanatory view before combining the bolt and one washer, (b) is an explanation of a bolt with one washer combining the bolt and washer Drawing, (c) is explanatory drawing of use of the bolt with one washer of (b). It is another example when the screw with washer of the present invention is a bolt, (a) is an explanatory view before combining the bolt and one washer, (b) is a bolt with one washer combining the bolt and the washer Explanatory drawing, (c) is a usage explanatory drawing of the bolt with one washer of (b). It is an example when the screw with washer of the present invention is a nut, (a) is an explanatory view before combining the nut and one washer, (b) is an explanation of the nut with one washer combining the nut and washer Drawing, (c) is explanatory drawing of use of the nut with one washer of (b). It is another example when the screw with washer of the present invention is a nut, (a) is an explanatory diagram before combining the nut and one washer, (b) is a nut with one washer combining the nut and washer Explanatory drawing, (c) is a usage explanatory drawing of the nut with one washer of (b). FIG. 1 is an example of a case where the screw with washer of the present invention is a bolt, (a) is an explanatory view before combining the bolt and two washers, and (b) is an explanation of a bolt with two washers combining the bolt and washer Drawing, (c) is explanatory drawing of use of the bolt with two washers of (b). It is another example when the screw with washer of the present invention is a bolt, (a) is an explanatory view before combining the bolt and two washers, (b) is a bolt with two washer combining nut and washer Explanatory drawing, (c) is explanatory drawing of use of the bolt with two washers of (b). It is an example in the case where the screw with washer of the present invention is a nut, (a) is an explanatory diagram before combining the nut and the two washer, (b) is an explanation of the nut with two washer combining the nut and the washer Drawing, (c) is explanatory drawing of use of the nut with two washers of (b). It is another example when the screw with washer of the present invention is a nut, (a) is an explanatory view before combining the nut and the two washer, (b) is a nut with two washer combining the nut and the washer Explanatory drawing, (c) is a usage explanatory drawing of the nut with two washers of (b). Explanatory drawing of use of a washer of the present invention. In the present invention, the continuous ridges are arcuately corrugated, and the individual protrusions are arcuately-shaped, and (a) is a sectional view before fitting and (b) is a sectional view in a fitted state.

As an example of the washer of the present invention, there is a washer having a shape shown in FIGS. 2(d) and FIG. 2(e), FIG. 2(f) and FIG. 2(g), FIG. 2(h) and FIG. 2(i), and FIG. 2 as an example of a washer set in which two washers are combined. There are combinations of (j) and FIG. 2(k), and FIG. 2(l) and FIG. 2(m). Screws with a single washer include combinations of FIGS. 1(a) and 1(d), 1(b) and 1(e), and 1(c) and 1(f). Screws with two washers are shown in FIGS. 2(a), 2(d) and 2(e), 2(b) and 2(f), 2(g), 2(b). 2(h) and 2(i), 2(c) and 2(j) and 2(k), 2(c) and 2(l) and 2(m) are combined. is there. Embodiments of the washer, the washer set, the screws with one washer, and the screws with two washer of the present invention will be described below.

(First Embodiment of Washer)
An example of the washer of the present invention is shown in FIGS. These washers 1 are the same, and a single washer front surface protrusion 4 is provided on the front surface of a washer substrate 3 having an insertion hole 2 in the center portion, and a single washer back surface protrusion 5 is provided on the back surface.

The washer front surface protrusion 4 and the washer rear surface protrusion 5 in FIGS. 1D and 1E have the same shape, for example, a conical shape as shown in FIG. 3C, and screws 6 such as bolts and nuts (see FIG. 1). The head continuous ridge 8 (FIGS. 1A and 3A and 3B) formed on the back surface of the head 7 of FIG. The head continuous ridges 8 are mountain-shaped elongated ridges that are substantially V-shaped in a side view, and are continuously formed over the entire circumference of the washer substrate 3 in the circumferential direction and are radially formed from the insertion hole 2 side toward the outer circumference. ing.

The washer surface protrusion 4 of FIG. 1E has a shape and hardness that can be digged into the planar back surface 10 of the screw 6 shown in FIG. 1B.

The conical washer front surface protrusion 4 and the washer rear surface protrusion 5 are formed by pressurizing the wall of the washer substrate 3 by pressing with a pressing machine. Around the roots of the washer front surface protrusion 4 and the washer rear surface protrusion 5, a pressure mark (concave portion) 11 (FIG. 3C) formed by a press machine is formed in a ring shape. The washer front surface projections 4 are formed at four circumferential positions on the washer surface, and the washer back surface projections 5 are formed at five circumferential positions on the washer back surface. Both the protrusions 4 and 5 are formed so as to be displaced in the circumferential direction of the disk-shaped washer substrate 3. If they are formed at the same positions on the front surface and the back surface, for example, if the washer surface protrusion 4 is press-molded first and then the washer back surface protrusion 5 is press-molded, the previously-formed washer surface protrusion 4 may be crushed. It is desirable to shift the position to avoid this collapse. Both the washer front surface projection 4 and the washer back surface projection 5 can be formed at one or several circumferential positions on the washer surface or the washer back surface. Although the number and the interval thereof can be designed arbitrarily, the number and the position are set so that they can be fitted into the adjacent concave portions 9 of the head continuous ridge 8 in FIG.

The washer surface protrusion 4 has another shape as long as it can be fitted with the adjacent recessed portion 9 (FIGS. 1A and 3A and 3B) of the head continuous protrusion 8 on the back surface of the head 7 of the screws 6. May be. As an example, what is shown in FIG. 3D is a mountain-shaped ridge having a pyramid shape when viewed from the end, and FIG. 3E is a ridge having an arc shape when viewed from the end. The number and spacing of these are designed so that they can fit into the adjacent recesses 9.

(Second Embodiment of Washer)
Embodiment 2 of the washer of the present invention is shown in FIG. This washer 1 is provided with a washer substrate 3 having an insertion hole 2 in the center thereof, a mountain-shaped washer front surface continuous ridge 12 having a substantially V shape in a side view, and a single washer back projection 5 on the back surface. is there. The washer surface continuous ridges 12 are elongated ridges having a chevron shape in a side view, like the head continuous ridges 8 of FIGS. It is formed radially from the center toward the outer periphery. Adjacent recesses 13 of the washer surface continuous protrusions 12 are fitted with head protrusions 14 (FIG. 1C) formed on the back surface of the head 7 of the screws 6. The washer front surface continuous ridge 12 and the washer back surface projection 5 can also be formed by pressing.

1(d) to 1(f), the washer back projection 5 has such a shape and hardness that it can bite into the connected body A (FIG. 4(c)) by tightening the screws 6, but the connected body A In the case of a material that does not want to be scratched by biting, a material that can be pressed against the connected body A, for example, a spring, rubber, resin or the like may be used. The spring, rubber, resin, etc. can be embedded in the washer or attached by other methods.

(Embodiment of washer set)
The washer set of the present invention is a combination of two washers, and the combination is, for example, the washer of FIGS. 2(d) and 2(e) or the washer of FIGS. 2(f) and 2(g). 2(h) and 2(i), the washers of FIGS. 2(j) and 2(k), and the washers of FIGS. 2(l) and 2(m). The washer of d) is an upper washer, and the washer of FIG. 2E is a lower washer. Similarly, the washer of FIG. 2(f) is the upper washer, the washer of FIG. 2(g) is the lower washer, the washer of FIG. 2(h) is the upper washer, and the washer of FIG. 2(i) is the lower washer, FIG. 2), the washer of FIG. 2(k) is the lower washer, the washer of FIG. 2(l) is the upper washer, and the washer of FIG. 2(m) is the lower washer.

2(d) to 2(m), the washer 1 has a single washer surface protrusion 4, an independent washer back protrusion 5, a washer surface continuous ridge 12 and its adjacent recess 13, and a washer back continuous ridge 16 and its adjacent recess 17. And so on. The shapes and structures of these independent projections, continuous ridges, and adjacent recesses may be the same as or different from those in FIGS. 1(d) to 1(f). The screws 6 of FIGS. 2A to 2C are the same as the screws 6 of FIGS. 1A to 1C.

(Embodiment 1 of screws with washers)
[One screw is a bolt and a washer]
4A to 4C show an example of a screw with a washer of the present invention when the screw 6 is a bolt, and the vicinity of the neck of the bolt shaft 18 below the head 7 of the screw 6 is shown. The washer 1 is attached (set) so as not to fall out.

The screws 6 shown in FIGS. 4(a) and 4(b) have bolt shafts 18 projecting from the back surface of the head portion 7, and a mountain-shaped head portion having a substantially V-shaped side view along the entire circumference of the back surface of the head portion 7. The continuous ridges 8 are continuously formed radially from the insertion hole 2 side to the outer peripheral side. Adjacent recesses 9 are formed between the head continuous ridges 8. In the present invention, a single washer 1 is set near the neck of the bolt shaft 18 before forming the thread 19 (FIG. 4C) on the bolt shaft 18. The washer 1 is set so as to be horizontally rotatable on the bolt shaft 18 and slidable in the axial direction of the bolt shaft 18. After setting, a screw thread 19 is cut on a portion of the outer peripheral surface of the bolt shaft 18 below the washer 1, and the diameter of the screw thread 19 is made larger than the insertion hole 2 of the washer 1 so that the washer 1 is attached to the screw thread 19. It is locked so as not to fall off the bolt shaft 18.

The washer 1 of FIG. 4(a) is the same as the washer 1 of FIG. 1(d), and a single washer surface protrusion 4 is provided at several circumferential positions on the washer surface, and is separately provided at several circumferential positions on the back surface. The washer back surface protrusion 5 is formed. The washer surface protrusion 4 has a conical shape as shown in FIG. 3C, and is formed by pressurizing it with a press so that the meat of the washer substrate 3 is projected to the surface side of the washer 1. A recess 11 (FIG. 3C) is formed around the root of the washer surface protrusion 4 by a press molding trace. The washer surface protrusion 4 is fitted with the adjacent recess 9 as shown in FIG. 4B by the tightening of the screws 6 to make it difficult to return, or not to return. The washer surface protrusion 4 has a shape and a projecting interval that can be fitted to the adjacent recessed portion 9, and the number thereof may be one or any number of two or more if it is not disengaged carelessly after fitting, and the shape may be different. It may have a shape. For example, it may be an elongated convex strip as shown in FIGS. This ridge can also be pressure-molded by pressing. In that case, a recess (not shown) is formed around the root of the ridge due to a press molding trace.

The washer back projection 5 can also be press-molded like the washer front projection 4. By press molding, a recess similar to the recess 11 (FIG. 3C) is formed.

The washer back surface projection 5 in FIG. 4B is a projection that can bite or press-connect to the connected body A (FIG. 4C) to be connected by tightening the screws 6. The objects to be connected A and B are metal plates, wood, resin plates and the like. The washer back protrusion 5 can be made harder than the material of the connected body A so as to be able to bite into the connected body A. However, if the connected body A does not want to be damaged, the washer back protrusion 5 is a spring. It is also possible to use rubber, resin, or the like having a large frictional resistance so that it can be pressed against the body A to be connected.

(Embodiment 2 of screws with washers)
[One screw is a bolt and a washer]
An example of the screw with a washer of the present invention shown in FIG. 5(b) is also a case where the screw 6 is a bolt, and one screw is provided near the neck of the bolt shaft 18 under the head 7 of the screw 6. It is attached (set) so that 1 does not fall out. The basic form of the screw with washer is the same as the screw with washer shown in FIG. 4(b), except that a single head back projection 14 is provided on the back surface of the head 7 of the screw 6. The washer surface continuous ridge 12 is provided on the surface of No. 1. The head back surface protrusion 14 is the same as the independent washer surface protrusion 4 of FIG. 3C, and the washer surface continuous ridge 12 has the same structure as the head continuous ridge 8 of FIGS. 3A and 3B. The two can be fitted to each other by tightening the screws 6.

(Embodiment 3 of screws with washers)
[One screw and one washer with nuts]
Another example of the washer-equipped screw of the present invention is shown in FIGS. This washer-equipped screw is a case where the screw 6 is a nut, and one washer 1 is set on the caulking shaft 20 projecting on the back surface of the head 7 of the screw 6, and as shown in FIG. 6(c). By crimping the lower end portion 21 of the caulking shaft 20 to the outer peripheral edge of the insertion hole 2 of the washer 1, the washer 1 is attached to the caulking shaft 20 so as not to come off from the caulking shaft 20. In this case, the washer 1 can be horizontally rotated on the outer periphery of the caulking shaft 20 and is caulked with a strength such that it can slide in the axial direction of the caulking shaft 20 (not too strongly caulking).

In the screws 6 shown in FIG. 6( a ), head continuous ridges 8 are formed on the entire circumference of the back surface of the head 7, and adjacent recesses 9 are formed between the head continuous ridges 8. .. The head continuous ridge 8 is formed by continuously forming a mountain-shaped ridge having a substantially V-shape in a side view, similarly to the head continuous ridge 8 of FIGS. 3(a) and 3(b).

The washer 1 shown in FIG. 6(a) has the same shape as the washer 1 of FIG. 1(a). It has a single washer front projection 4 and a single washer back projection 5. The washer front surface projection 4 has a shape and a projecting interval that can be fitted into the adjacent recessed portion 9 of the screws 6, and the washer back surface projection 5 is a projection capable of biting or press-contacting the connected body A or B (FIG. 5(c)). is there.

(Embodiment 4 of screws with washers)
[One screw and one washer with nuts]
An example of a screw with a washer of the present invention shown in FIG. 7B is also a case where the screw 6 is a nut, and one washer is provided near the neck of the caulking shaft 20 below the head 7 of the screw 6. It is attached (set) so that 1 does not fall out. The basic form of the washer-equipped screw is the same as that of the washer-equipped screw shown in FIG. 6(b), except that the head 6 of the screw 6 is provided with a single head back projection 14 and The washer surface continuous ridge 12 is provided on the surface of No. 1. The head back surface protrusion 14 is the same as the individual protrusions 4 and 5 in FIG. 6A, and the washer surface continuous ridge 12 has the same structure as the head continuous ridge 8 in FIG. 6A. The screws 6 can be fitted together by tightening.

(Embodiment 5 of screws with washers)
[Two washers with screws for bolts]
As an embodiment of the screw with washer of the present invention, those shown in FIGS. 8(a) to (c) are such that the screw 6 is a bolt, and the two washers 1 (1a, 1b) are set so as not to come off. It is a thing. A head continuous ridge 8 is formed on the entire back surface of the head 7 of the screws 6 in the circumferential direction. Similar to the head continuous ridge 8 of FIG. 1(a), the head continuous ridge 8 is formed by continuously radiating mountain-shaped protrusions having a substantially V shape in a side view.

The upper washer 1a shown in FIG. 8(a) is provided with a single upper washer surface protrusion 4 and an upper washer back surface continuous ridge 16. The upper washer surface projections 4 are provided so as to project at several positions in the circumferential direction on the surface of the washer 2, and have a shape and a projecting interval that can be fitted into the adjacent recesses 9 between the head continuous ridges 8. The upper washer back surface continuous ridge 16 has a mountain-shaped protrusion having a substantially V shape in a side view and is radially formed continuously over the entire circumference of the upper washer 1a in the circumferential direction.

The lower washer 1b shown in FIG. 8A includes a lower washer front surface continuous ridge 12 and a single lower washer rear surface protrusion 5. Similar to the upper washer back surface continuous ridges 16, the lower washer front surface continuous ridges 12 are formed in a radial pattern in which the V-shaped chevron projections in a side view are continuously formed over the entire circumference of the lower washer 1b in the circumferential direction. The lower washer front surface continuous ridge 12 can be fitted to the upper washer back surface continuous ridge 16.

(Embodiment 6 of screws with washers)
[Two washers with screws for bolts]
As an example of the screw with washer of the present invention shown in FIGS. 9(a) to 9(c), the basic structure is the same as that shown in FIGS. 8(a) to 8(c). The difference is that the head back surface 10 is made flat, and the upper washer surface protrusion 4 is provided on the surface of the upper washer 1a, and the screw 6 is tightened so that the upper washer surface protrusion 4 becomes a planar head back surface 10. I tried to cut in. The upper washer surface protrusion 4 is hardened by hardening to make it harder than the back surface 10 of the head, or the upper washer 1a is made harder than the material of the head 7 to make it easier to bite into the back surface 10 of the head. ..

(Embodiment 7 of screws with washers)
[Screws are nuts and two washers]
10(a) to 10(c) as an example of the screw with washer of the present invention, the screw 6 is a nut, and two washers 1 (1a, 1b) are set so as not to come off. It is a thing. A head continuous ridge 8 is formed on the entire back surface of the head 7 of the screws 6 in the circumferential direction. Similar to the head continuous ridge 8 of FIG. 1(a), the head continuous ridge 8 is formed by continuously radiating mountain-shaped protrusions having a substantially V shape in a side view.

The upper washer 1a shown in FIG. 10A includes an upper washer surface protrusion 4 and an upper washer back surface continuous ridge 16. The upper washer surface protrusions 4 are provided so as to project at several points in the circumferential direction on the surface of the upper washer 1a, and have a shape and a projecting interval that can be fitted into the adjacent recessed portions 9 of the head continuous ridge 8. The upper washer back surface continuous ridge 16 has a mountain-shaped protrusion having a substantially V shape in a side view and is radially formed continuously over the entire circumference of the upper washer 1a in the circumferential direction.

The lower washer 1b shown in FIG. 10A includes a lower washer front surface continuous protrusion 12 and a lower washer rear surface protrusion 5. Similar to the upper washer back surface continuous ridges 16, the lower washer front surface continuous ridges 12 are radially formed by continuously forming a V-shaped chevron projection in a side view on the entire circumference of the lower washer 1b in the circumferential direction. The lower washer front surface continuous ridge 12 can be fitted to the upper washer back surface continuous ridge 16.

(Embodiment 8 of screws with washers)
[Screws are nuts and two washers]
11(a) to 11(c) as an example of the screw with washer of the present invention has the same basic configuration as that shown in FIGS. 10(a) to 10(c). The difference is that the head back surface 10 is made flat, and a single upper washer surface projection 4 is provided on the surface of the upper washer 1a, and the upper washer surface projection 4 bites into the head back surface 10 by tightening the screws 6 That's what I did. The upper washer surface protrusion 4 is also harder than the head back surface 10.

(Embodiment 9 of screws with washers)
In any of the above-described embodiments, the head continuous ridge 8, the washer surface continuous ridge (lower washer surface continuous ridge) 12, the washer back surface continuous ridge (upper washer back continuous ridge) 16 have a mountain shape in a side view (approximately V). In the present invention, all of the head continuous ridges 8, the washer front surface ridges 12, and the washer back surface continuous ridges 16 are arc-shaped waveforms as shown in FIGS. 13(a) and (b). In addition, the individual protrusions 4 and 5 that fit with them can also have an arc shape. With such an arc shape, the head continuous ridges 8, the washer front surface continuous ridges 12, the washer back surface continuous ridges 16 and the individual protrusions 4 and 5 are less likely to be chipped than in the V-shaped case.

(Example of washer usage)
The washer of the present invention can be used as shown in FIG. The washer 1 shown in FIG. 12 is the washer of FIG. 1A, and the screws 6 shown in FIG. 12 are nuts. This nut has a tubular guide 40 under the head 7. After inserting this guide 40 into the insertion hole 2 of the washer 1 and setting it under the head 7, it is screwed into the bolt in the same manner as a normal nut. The washer 1 shown in FIG. 1A can be used by setting one or two existing nuts and bolts.

(Example of using screws with washers)
An example of using the screw with washer of the present invention is shown in FIGS. 4(c), 5(c), 8(c) and 9(c). These use examples are examples in which two plate-shaped objects A and B to be connected are connected and fixed. Among these examples of use, the example of use of FIG.4(c) is demonstrated below.
(1) Insert the bolt shaft 18 of the washer-equipped bolt 25 into the insertion holes of the two connected bodies A and B that are stacked.
(2) The nut 26 with a washer is screwed onto the bolt shaft 18 protruding downward of the connected body B below, and the nut 26 with a washer is tightened to form the head continuous protrusion 8 of the bolt 25 with a washer and the washer surface protrusion. 4 and the head continuous ridge 8 of the nut 26 with washer and the washer surface protrusion 4 are fitted together. After that, it is also tightened so that the washer back protrusion 5 of the bolt with washer 25 bites into the connected body A, and the washer back protrusion 5 of the nut with washer 26 bites into the connected material B to connect the two connected bodies A and B. Link.

The screws in the present invention also include tacks, screws, and other screws. The continuous ridges 8, 12, and 16 according to the present invention may not have a chevron shape that is substantially V-shaped in a side view, but may have another shape, for example, a chevron-shaped ridge line portion that is substantially flat or arc-shaped. Further, the mountain shape has an upslope 30 (FIG. 3(b)) on one side of the ridge line portion (front side in the rotation direction) and a locking surface 31 (FIG. 3(b)) on the other side of the ridge line portion (front side in the rotation direction). The angles of the ascending slope 30 and the locking surface 31 can be designed to be arbitrary angles at which the screws 6 easily rotate and are hard to loosen after tightening.

1 washer 1a upper washer 1b lower washer 2 insertion hole 3 washer substrate 4 washer surface protrusion (upper washer surface protrusion)
5 Washer backside protrusion (lower washer backside protrusion)
6 Screws 7 Head (of screw) 8 Head continuous ridge 9 Adjacent recessed portion (of head continuous ridge) 10 Head back surface 11 Recessed portion (pressurized trace)
12 Washer surface continuous ridge (lower washer surface continuous ridge)
13 Adjacent recesses (of continuous washer front surface) 14 Head back surface projection 16 Washer back surface continuous projection (upper washer back surface continuous projection)
17 Adjacent recesses (of continuous ridges on washer back side) 18 Bolt shaft 19 Screw thread 20 Caulking shaft 21 Lower end part (of caulking shaft) 25 Washer bolt 26 Washer nut 30 Ascending surface 31 Locking surface 40 Guide A, B Connected body

Claims (6)

Screws with washers set on the back side of the head of screws such as bolts and nuts so that two washers are stacked one above the other to prevent them from falling off.
The back of the head of the screw is flat,
Theravada deposits of the two washers has upper washer surface protrusions (4) on its surface, there are upper washer backside continuous ridge (16) on the back surface, the circumferential direction of the upper washer surface protrusions (4) are washers surface One piece independently protrudes at one place or several places, and it is possible to bite or press contact with the back surface of the head of the screw by tightening the screws, and the top and bottom washer continuous ridges (16) have washer and valley washers. a chevron or wave repeatedly alternating succession on the rear surface of the circumferential direction, there is an uplink slopes become upward toward the mountain valley tightening direction front side of the screw such, toward the peak-to-valley in the tightening direction other party side There is a downward sloped locking surface,
Lower seat deposits of the two washers has lower washer surface protrusions (4) on its surface, the lower washer surface protrusions (4) are one protrudes independently circumferentially one place or several places of the lower washer surface cage, this one of the lower seat gold surface protrusions (4) by tightening the screws, fitted in an adjacent recess (17) between one of continuous convex washers backside continuous ridges on the upper seat gold (16) It is a protrusion that can be locked,
Screws with washers characterized by Screws with washers set on the back side of the head of screws such as bolts and nuts so that two washers are stacked one above the other to prevent them from falling off.
The back of the head of the screw is flat,
Theravada deposits of the two washers has upper washer surface protrusions (4) on its surface, there are upper washer back surface projection (5) on the back, the upper washer surface protrusions (4) one circumferential location of the washer surface or protrude one is independently at several locations, are possible bite or pressed against the head rear surface of the screw such a tightening of the screw such, the upper washer back surface protrusions (5) one circumferential location or number of washers back surface One piece independently protrudes in the place,
Lower seat deposits of the two washers has lower washer surface continuous ridge (12) on its surface, the lower washer surface continuous ridge (12) mountains and valleys repeatedly alternating succession in the circumferential direction of the washer surface It is a mountain shape or a wave shape, and there is an upward slope that goes up from the valley to the mountain on the front side in the tightening direction of the screws, and a locking surface that becomes a downward slope from the peak to the valley on the forward side in the tightening direction, tightening of screws, either between successive convex adjacent recesses (13) to said one of the independent on washer back surface protrusions (5) at the head gold fitted a lockable,
Screws with washers characterized by The screws with washers according to claim 1 or 2 ,
There are lower washer back surface projection (5) on the rear surface of the lower seat deposits of the two washers protrude one is independent on its lower washer back surface projection (5) is one place back surface circumferential direction or several points, screws Is a protrusion that can bite into or be pressed into the connected body (A) by tightening
Screws with washers characterized by The screw with washer according to any one of claims 1 to 3 ,
The ridge line portion of the continuous ridge (16 or 12) is flat or arcuate,
Screws with washers characterized by The screw with washer according to any one of claims 1 to 3 ,
The peaks and valleys of the continuous ridges (16 or 12) are arcuate shapes of a semicircle as viewed from the end face, and are the same or substantially the same shape repeated.
Screws with washers characterized by The screw with washer according to any one of claims 1 to 5 ,
Lower washer surface protrusions of waveform one circumferentially one place or several places washer protrudes independently (4) or the upper washer back surface protrusions (5), the waveform is an arc-shaped end view substantially semicircular , By the rotation of the screws in the tightening direction, it is fitted into the fitting concave portion (13 or 17) between any of the continuous ridges, and the fitting is difficult to loosen in the opposite rotation,
Screws with washers characterized by

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