JP6613045B2 - Screws with washers - Google Patents

Description

  The present invention relates to a screw with a washer having a washer at the base of the back surface of the head of a screw, such as a bolt, nut, and rivet, and more particularly to a washer and a screw with a washer that can prevent loosening of a tightened screw. It is.

  Conventionally, as a washer or a screw with a washer having a locking mechanism, there is a washer or a screw with a washer previously filed by the present applicant (Patent Document 1). As for this washer, the washer protrusion of the mountain shape by the side view was provided radially on the surface (upper surface), and the biting protrusion was provided in the circumferential direction several places on the back surface (bottom surface). When this washer is set on the back side of the head of the screw and tightened, the head protrusion provided on the back of the head of the screw engages with the washer protrusion, the washer is tightened, and the biting protrusion is the object to be tightened. In order to prevent the screws from loosening.

JP 2006-242324 A

  The screw with a washer of Patent Document 1 has an advantage that when the screw is tightened, the head protrusion of the screw meshes with the washer protrusion of the washer, so that the tightening is ensured and the screw is difficult to loosen.

  An object of the present invention is to provide a screw with a washer that is difficult to loosen a screw.

(Two washers, concave on the back of the head, convex on the top washer)
The screw with a washer according to the present invention is a screw with a washer set so that the washer does not fall off on the back surface of the head of the screw, such as a nut or a bolt. A concave portion such as a hole or a recess (hereinafter referred to as “head rear surface concave portion”, which is the same in the claims) is formed at the location, and two upper and lower washers are set on the base side of the head rear surface of the screw. A convex portion (hereinafter referred to as “upper washer surface convex portion”, which is the same in the claims) is formed at one or more locations in the circumferential direction of the surface of the upper washer. One or several back surface recesses are formed at each forming location, and the top washer surface protrusion and the head back surface recess are shaped and sized to fit with each other, and can be mutually connected in any tightening direction by tightening screws. Difficult to reverse after mating or reverse The protrusions on the back surface of the upper washer (hereinafter referred to as “upper washer rear surface protrusion”; the same applies to the claims) and the protrusions on the surface of the lower washer (hereinafter referred to as “lower washer surface protrusion”). The same applies to the claims.) Is a chevron projection that meshes with each other at any location in the circumferential direction of the washer and is difficult to reverse or does not reverse, and these chevron projections are formed continuously from two or more ridges. The protrusions (hereinafter referred to as “lower washer back surface protrusions”, the same applies to the claims) are protrusions that can bite into or be brought into pressure contact with the connecting material connected by the screws.

(Two washers, convex on the back of the head, concave on the top of the washer)
Contrary to the screws with washers, the screws with washers of the present invention are called convex portions (hereinafter referred to as “head rear surface convex portions”) at one or more locations in the circumferential direction on the back surface of the head of the screws. The same is applied to the surface of the upper washer, and recesses such as holes and dents (hereinafter referred to as “upper washer surface recesses”) are formed at one or more circumferential positions on the surface of the upper washer. ) May be formed. The top washer surface recess and head back surface protrusion are also of a shape and size that can be fitted to each other, and are screwed together so that they can be fitted to each other at any position in the tightening direction and difficult to reverse. You can also. One or several of the upper washer surface concave portion and the head rear surface convex portion can be formed at the respective locations.

(Two washers, head back projection and top washer surface projection, top washer back projection and bottom washer surface projection are angle projections)
The screw with a washer of the present invention has a protrusion on the back surface of the head formed on the back surface of the head of the screw (hereinafter referred to as “head back surface protrusion”; the same applies to the claims), and a head of the screw. The upper washer surface protrusion formed on the surface of the upper washer among the two washer set on the base side of the back surface is an angled protrusion that fits each other by tightening screws and is difficult to reverse or does not reverse. The back surface protrusion and the lower washer surface protrusion also engage with each other and are angled protrusions that are difficult to reverse or do not reverse, and the lower washer back surface protrusion can be a protrusion that can bite into or be pressed against the connecting material connected by the screws.

(One washer, concave on the back of the head, convex on the washer surface)
The screw with a washer is a case where there are two washers. However, the screw with a washer according to the present invention may be one in which only one washer is set on the base side of the back surface of the head of the screw. In this case, a head back surface concave portion such as a hole or a depression is formed in one or more locations in the circumferential direction of the head back surface of the screw, and a washer surface convex portion is formed in one or more locations in the circumferential direction of the surface of the washer. It may be formed. One or several of the washer surface convex portion and the head rear surface concave portion are formed at each forming location, and have a shape and size that can be fitted to each other, and can be fitted to each other in any tightening direction by tightening screws. Therefore, the washer back surface protrusion of the washer is also a protrusion that can be bitten or pressed into the connecting material connected by the screws.

(One washer, convex on the back of the head, concave on the top of the washer)
The screw with a washer is a case in which there is a single washer and a concave portion is formed on the back surface of the head of the screw and a convex portion is formed on the surface of the washer. The screw with a washer of the present invention is a screw with the washer. Contrary to the above, a head back convex portion is formed at one or more locations in the circumferential direction on the back surface of the head of the screw, and holes or depressions are formed at one or more locations in the circumferential direction on the surface of one washer. It may be formed with a recess on the washer surface such as. In this case, the head back surface convex part and the washer surface concave part have shapes and sizes that can be fitted to each other, and are not fitted back to each other at any position in the tightening direction by tightening screws, or do not reverse. To do.

(Back washer protrusion)
If the bottom washer back projection when there are two washers and the back washer projection with one washer can be pressed against the connecting material, the projection should be made of an elastic material such as rubber or resin, or a spring material. Is attached to the back surface of the lower washer in the case of two sheets or to the back surface of the washer in the case of one sheet.

  It is desirable that the upper washer and the lower washer, or the washer in the case of a single sheet, be attached to the back of the head of the screw so as to be horizontally rotatable on the outer periphery of the bolt shaft or the caulking shaft and to be slidable in the axial direction of the shaft.

The screw with washer of the present invention has the following effects.
(1) By tightening the screws, the concave portion on the back surface of the head of the screws and the convex portion of the washer surface in the case of one piece or the convex portion of the upper washer surface in the case of two pieces are fitted to each other to prevent loosening of the screws. The
(2) By tightening the screws, the head back surface convex portion of the screws and the washer surface concave portion in the case of one piece or the upper washer surface concave portion in the case of two pieces are fitted to each other to prevent loosening of the screws. .
(3) By tightening the screws, the chevron-shaped head back surface projection of the screws and the chevron upper washer surface projection of the upper washer in the case of two screws mesh with each other, and the screws are prevented from loosening.
(4) By tightening the screws, the washer back surface protrusion in the case of one sheet or the lower washer back surface protrusion in the case of two sheets bites into or presses against the connecting material, thereby preventing the screws from loosening.

The screw with a washer of the present invention is an example of a bolt, (a) is a front view showing a state before combining the bolt and two washers, (b) is a front view after combining the bolt and washer, (C) is explanatory drawing in the case of fixing a connection material using a nut with a washer and a bolt with a washer. It is an example in case the screw with a washer of this invention is a nut, (a) is a front view which shows the state before combining a nut and two washers, (b) is a front view after combining a nut and a washer. It is another example in case the screw with a washer of the present invention is a bolt, (a) is a front view showing a state before the bolt and two washers are combined, (b) is a front view after combining the bolt and the washer. (C) is explanatory drawing in the case of fixing a connection material using a nut with a washer and a bolt with a washer. It is another example in case the screw with a washer of the present invention is a nut, (a) is a front view showing a state before the nut and two washers are combined, and (b) is a front view after the nut and washer are combined. . (A) is an example of the top washer used for the screw with a washer of this invention, (a) is a top view, (b) is XX sectional drawing of (a). It is an example of the upper washer used for the screw with a washer of the present invention, and is a case where a projection is formed at a location near the outer periphery in the radial direction of the washer body, (a) is a plan view, and (b) is the back surface of the washer. The top view, (c) is XX sectional drawing of (b), (d) is a top view at the time of providing a protrusion in the perimeter of the protrusion formation part of a washer main body. It is another example of the upper washer used for the screws with the washer of the present invention, and is a case where the projection forming portion is formed at a location near the radial outer periphery of the washer body and a location near the radial inner side, (a ) Is a plan view, (b) is a plan view of the back surface of the washer, and (c) is an XX cross-sectional view of (b). The lower washer back projection is an elastic body, (a) is a plan view when the projection is a triangle, (b) is a plan view when the projection is a star, and (c) is a spherical projection. (D) is a plan view when the protrusion is an elongated protrusion. Sectional detail drawing in case a lower washer back surface protrusion is an elastic body. (A) (b) is a case where the lower washer back projection is an elastic body, and the explanatory diagram of a different shape when the projection of the elastic body is ring-shaped, (c) is a projection of (a) or (b) The top view of the provided washer, (d) is XX sectional drawing of (c). (A) and (b) are sectional views of a washer provided with springs having different shapes when the lower washer back projection is a spring. It is sectional drawing of the upper washer back surface protrusion and lower washer surface protrusion used for the screws with a washer of this invention, (a) is a side view of the example which made the ridgeline part of the protrusion arc-shaped, (b) The side view of the example which made the ridgeline part of processus | protrusion flat. It is another example of the screws with washers of the present invention, (a) is a front view showing a state before the nut and the washer are combined, (b) (c) is an explanatory view of the washer surface protrusion. (A) (b) is a top view which shows the example from which a washer surface convex part differs in this invention.

(Embodiment 1 of screw with washer)
[When screws are bolts: Fig. 1]
As an example of the screw 1 with a washer of the present invention, the screw shown in FIGS. 1A to 1C is a case where the screw 2 is a bolt and the number of washers is two. A head back surface recess 3 a is formed at several locations in the circumferential direction of the back surface 12 of the head 3 of the screw 2. Although the shape of the head back recess 3a is a round hole, it may be a hexagonal hole, other shapes, or a recess. In this bolt, before the screw thread 14 (FIG. 1 (c)) is formed on the bolt shaft 13 protruding on the back surface 12 of the head, two bolts are formed on the neck portion (the portion without the screw thread) of the bolt shaft 13. The washer 5a and 5b are set so as to overlap each other. In this case, the two washers 5a and 5b are set so as to be horizontally rotatable around the bolt shaft 13 and to be slidable in the axial direction of the bolt shaft 13. After setting, the screw thread 14 is cut in the lower part of the outer peripheral surface of the bolt shaft 13 below the lower washer 5b, and the diameter of the screw thread 14 is made larger than the through hole 6 of the washers 5a, 5b. Is locked to the screw thread 14 so as not to fall off the bolt shaft 13.

[Upper washer: Fig. 1 (a)]
The upper washer 5a in FIG. 1A has upper washer surface protrusions 5c projecting at several locations in the circumferential direction of the surface, and upper washer rear surface protrusions 9 are formed on the rear surface. The upper washer surface convex portion 5c has a shape, number, and protruding interval that can be fitted to the head rear surface concave portion 3a.

[Lower washer: Fig. 1 (a)]
The lower washer 5b in FIG. 1 (a) has lower washer surface protrusions 10 projecting at several places in the circumferential direction of the surface, and lower washer rear surface protrusions 11 are formed on the rear surface. The lower washer back surface protrusion 11 is a protrusion that can bite into or be pressed against each of the two connecting members A and B (FIG. 1C) to be connected. Similarly to the upper washer back projection 9, the lower washer surface projection 10 is provided at several locations in the circumferential direction on the surface of the lower washer 5 b, and the non-projection portion 35 without projections is formed between these lower washer surface projections 10. The place where the lower washer surface protrusion 10 is formed may be another place in the circumferential direction of the surface of the lower washer 5b, and the number of places to be formed may be another number, and provided on the entire circumference of the surface of the lower washer 5b. You can also. The lower washer back projection 11 is formed on the back surface of the lower washer 5b on the back side of the non-projected portion. The lower washer back projection 11 can be projected at any number of locations in the circumferential direction of the back washer 5b when there is no protrusion on the surface of the lower washer 5b.

[Various examples of washer]
Various examples of the upper washer 5a shown in FIG. 1 (a) are shown in FIGS. 6 (a) to 6 (d) and FIGS. 7 (a) to 7 (c). The upper washer 5 a has a through hole 6 at the center of a disc-shaped washer body 20, an upper washer surface convex portion 5 c is formed on the surface, and upper washer back projections at four locations in the circumferential direction on the back surface of the washer body 20. 9 is formed, and there are no protrusions 35 (FIGS. 6B and 7B) between the four upper washer back surface protrusions 9 without protrusions. The through hole 6 has a diameter into which a cylindrical bolt shaft 13 (FIG. 1A) and a caulking shaft 4 (FIG. 2A) protruding from the back surface of the head 3 of the screw 2 can be inserted.

  6A and 7A, four upper washer surface convex portions 5c are projected at equal intervals in the circumferential direction of the washer body 20, and each has a round bar shape. As long as the shape can be fitted into the head back surface recess 3a, it can be in the shape of a bar or other shapes. The projecting dimensions, external dimensions, and the like can be designed so as not to be inadvertently removed once they are fitted to the head back surface recess 3a.

[Upper surface of washer surface]
The upper washer surface convex portion 5c can be formed by pressurizing the surface of the washer body 20 with a press machine so that the meat of the washer body 20 protrudes toward the upper washer surface side. In this case, a pressurization concave portion 5d is formed by being depressed by one step from the surface of the washer body 20 on the entire circumference or part of the periphery of the base of the upper washer surface convex portion 5c. The upper washer surface convex part 5c can also be formed by a method other than the above.

  The upper washer surface convex portion 5c in FIG. 1A is a surface of the washer body 20, and is provided on the opposite surface of the non-projecting portion 35 (FIGS. 6B and 7B).

[Upper washer back protrusion and lower washer surface protrusion]
As shown in FIG. 6 (b), the upper washer back projection 9 is located between the through-hole 6 at the center of the washer body 20 and the outer peripheral edge 30, and at several locations (four locations) near the outer peripheral edge 30. Further, it is formed concentrically with the through hole 6 and the outer peripheral edge 30. In this case, a protrusion forming portion (outer protrusion forming portion) 22 that is one step higher than the back surface is formed in a ring shape on a part of the back surface of the washer body 20, and the upper washer back surface protrusion 9 is formed on the protrusion forming portion 22. be able to.

  7B is formed in a ring shape at both the location near the outer peripheral edge 30 of the washer body 20 and the location near the through hole 6, and the upper washer back projection 9 is formed on both projection formation portions 22. Is formed.

  The upper washer back projections 9 shown in FIGS. 6B and 7B are formed at four locations in the circumferential direction of the respective projection forming portions 22, and the other four locations are free of the upper washer back projection 9. The protrusion 35 is provided. The formation location of the upper washer back projection 9 and the non-projection portion 35 can be different from those shown in the figure. The number of formation locations can be other than that shown, and the number of the top washer back projections 9 can be selected as appropriate.

  The upper washer back projection 9 has a chevron shape that meshes with the lower washer surface projection 10 of the lower washer 5b. As shown in FIGS. 12A and 12B, a climbing slope 36, a locking surface 37, and a ridge line portion 38 are provided. The climbing slope 36 is formed in front of the ridgeline portion 38 in the tightening rotation direction, and the ridgeline portion 38 is formed at the intersection (mountain peak) of the climbing slope 36 and the locking surface 37. As shown in FIG. 12A, the top of the ridge line portion 38 has an arc surface shape, and is chipped or crushed due to engagement with the lower washer surface protrusion 10 (FIG. 1A) formed on the lower washer 5b. It is difficult to get lost. The top part of the ridge line part 38 can also be planar as shown in FIG.12 (b). By making the top part of the ridge line part 38 into an arc shape or a planar shape, it becomes difficult to be chipped and crushed (hard to be lost) due to the engagement with the lower washer surface protrusion 10 of the lower washer 5b.

  The multiple top washer back projections 9 have the same shape. Projection dimension of the upper washer back projection 9 (FIGS. 12A and 12B), the inclination angle of the climbing slope 36, the inclination angle of the locking surface 37, the arc surface radius R of the ridge line portion 38, and the plane width in the case of a flat shape Etc. can be appropriately designed according to the diameter (size) of the washer body 20 and the application. When the diameter of the upper washer 5a and the lower washer 5b is 19 mm and the thickness is 3 mm, the inclination angle (gradient) of the climbing slope 36 is about 10 to 60 degrees, the angle of the locking surface 37 is about 70 to 90 degrees, and the arc surface of the ridge line portion 38 A radius of about 0.2 to 0.3 mm is preferable. These dimensions can be designed according to the diameter size and thickness of the upper washer 5a and the lower washer 5b, the height of the upper washer back projection 9 and the like.

  The lower washer 5b in FIG. 1 (a) meshes with the upper washer 5a, and has a lower washer surface projection 10 on the surface and a lower washer back projection 11 on the back surface. The lower washer surface protrusion 10 has an inclination opposite to that of the upper washer back protrusion 9, and when the upper washer back protrusion 9 is tightened and rotated, the upper washer rear surface protrusion 9 is inclined so as to easily get over the lower washer surface protrusion 10. Yes, it is difficult to reversely rotate, and is inclined not to loosen or loosen.

  Since the upper washer back projection 9 and the lower washer surface projection 10 must be engaged at any position in the tightening direction of the screws 2, the formation length (formation width) W1 of the upper washer back projection 9 and the lower washer surface projection 10 (see FIG. 6 (b) and FIG. 7 (b)) are longer than the length (width) W2 (FIG. 6 (b) and FIG. 7 (b)) of the non-projection portion 35. The illustrated upper washer back projection 9 and lower washer surface projection 10 are chevron shaped to engage with each other, and in the tightening direction of the screws 2, they can easily move over each other but rotate in the opposite direction and are difficult to reverse each other. It is a chevron that does not reverse. In order to be sure to engage at any position in the rotational (tightening) direction, at least one of the upper washer back projection 9 and the lower washer surface projection 10 is attached to the back of the upper washer 5a as shown in FIG. You may provide in the circumferential direction perimeter of the surface of the lower washer 5b.

[Back washer protrusion]
The lower washer back surface protrusion 11 is a protrusion that can bite into or be pressed against each of the two connecting members A and B (FIG. 1C) to be connected. The lower washer rear surface protrusions 11 are projected at equal intervals at four locations in the circumferential direction of the lower surface of the lower washer 5b, but the number, shape, projecting interval, and the like can be arbitrarily designed according to the application.

  The head back recess 3a, the upper washer surface protrusion 5c, the upper washer back protrusion 9, the lower washer surface protrusion 10, and the lower washer back protrusion 11 can be formed by pressing with a press, and formed by other methods. You can also.

(Embodiment 2 of screw with washer)
[When concave and convex parts are opposite to those in Embodiment 1]
In the first embodiment, as shown in FIG. 1A, the head back surface concave portion 3a is provided on the back surface of the head 3 of the screw 2 and the upper washer surface convex portion 5c is provided on the surface of the upper washer 5a. In the present invention, conversely, a convex portion can be provided on the back surface of the head 3 of the screw 2 and a concave portion can be provided on the surface of the upper washer 5a. The convex part and the concave part are also fitted to each other by tightening the screws 2 so as to have a shape and size that are difficult to reverse or do not reverse. The number of these concave portions and convex portions can also be an arbitrary number.

(Embodiment 3 of screw with washer)
[When the screws are nuts: Fig. 2]
FIG. 2B shows another example of the screw 1 with a washer according to the present invention, in which the screw 2 is a nut, and the caulking shaft 4 protruding from the back surface of the head 3 of the screw 2 The two washers 5a and 5b are set up and down, and the lower end 4a of the caulking shaft 4 is crimped to the outer peripheral edge of the through hole 6 of the washers 5a and 5b, thereby attaching the washers 5a and 5b to the nut 2. The caulking shaft 4 is prevented from falling off. In this case, the upper washer 5a and the lower washer 5b can be rotated horizontally around the outer periphery of the screw shaft or the caulking shaft, and can be slid up and down (not too strongly).

[Recessed head back]
In the screws 2 shown in FIG. 2A, the head back surface recess 3 a is formed at two or more locations in the circumferential direction of the back surface 8 of the head 3. The head back surface concave portion 3a is fitted with the upper washer surface convex portion 5c projecting at two or more locations on the surface of the upper washer 5a in the circumferential direction. As an example, the head back surface recess 3a shown in FIG. 2 (a) is a round hole, but the head back surface recess 3a may be a hexagonal hole or other shape hole, and may be a shallow recess instead of a hole. Good.

[Upper washer: Fig. 2 (a)]
The upper washer surface convex portion 5c shown in FIG. 2 (a) has a round bar shape, and can be fitted to the concave portion 3a on the head back surface of the screw 2 by tightening the screw 2 so as not to loosen or loosen. The shape and size that can be fitted into the head back surface recess 3a are projected in the same number as the head back surface recess 3a at the same interval as the head back recess 3a.

  An upper washer back projection 9 is provided on the rear surface of the upper washer 5a in FIG. The upper washer back projection 9 is a chevron projection, and as shown in FIGS. 6 (b) and 7 (b), is provided at four locations in the circumferential direction on the back surface of the upper washer 5a, and the upper washer is between the four locations. The protrusion-free portion 35 has no back-surface protrusion. The place where the upper washer back projection 9 is formed may be another place in the circumferential direction of the back face of the top washer 5a, and the number of places may be other than four, as shown in FIG. It can also be provided all around the back surface of the washer 5a.

[Lower washer: Fig. 2 (a)]
A lower washer surface projection 10 projects from the surface of the lower washer 5b, and a lower washer back projection 11 projects from the rear surface. Similarly to the upper washer back projection 9, the lower washer surface projection 10 is provided at four locations on the surface of the lower washer 5 b in the circumferential direction, and a space between these lower washer surface projections 10 is a no-projection portion 35 without projections. The place where the lower washer surface protrusion 10 is formed may be another place in the circumferential direction of the surface of the lower washer 5b, and the number of places to be formed may be other than four, and is provided on the entire circumference of the surface of the lower washer 5b. You can also.

(Embodiment 4 of screw with washer)
[Lower washer back protrusion: FIGS. 8 to 11]
For the lower washer back projection 11 of the screws with washers, an elastic material such as rubber or silicon or an elastic body such as a spring can be used.

[Lower washer back projection by elastic material]
The lower washer back projection 11 shown in FIG. 8A is formed by, for example, forming an elastic body 23 formed in a triangular ring shape with an elastic material such as rubber or silicon into a groove-like recess formed on the surface of the washer body 20. It is housed and fixed in the portion 24 (FIG. 9), and the distal end portion 25 of the elastic body 23 is projected out of the recessed portion 24.

  The lower washer back projection 11 shown in FIG. 8B is a groove-like recessed portion formed on the surface of the washer body 20 from an elastic body 23 formed in a star-shaped ring shape by an elastic material such as rubber or silicon. 24 (FIG. 9), the distal end portion 25 of the elastic body 23 protrudes out of the recessed portion 24.

  The lower washer back projection 11 shown in FIG. 8C accommodates and fixes an elastic body 23 formed in a chip shape with an elastic material such as rubber or silicon in a hole-like recessed portion 24 formed on the surface of the washer body 20. Then, the distal end portion 25 of the elastic body 23 is projected out of the recessed portion 24 as shown in FIG.

  The lower washer back projection 11 shown in FIG. 8 (d) accommodates and fixes the elastic body 23 in the form of a slender chip in a slender recess 24 formed at regular intervals in the circumferential direction of the back surface of the washer body 20. Then, the distal end portion 25 of the elastic body 23 is projected out of the recessed portion 24 as shown in FIG.

  As another example of the elastic body 23, the one shown in FIG. 10A is formed by protruding protrusions 29 at four intervals in the circumferential direction of the ring-shaped fitting portion 26 at intervals of 90 degrees. As shown in FIG. 10A, the cross-sectional shape of the fitting portion 26 is a circular arc at the lower portion 27, the upper surface 28 is a flat semicircular arc shape, and the cross-sectional shape of the convex portion 29 is a semicircular arc shape. The convex part 29 is integrally formed with the fitting part 26 and has a perfect circle shape.

  The elastic body 23 shown in FIG. 10A can be fitted into a ring-shaped recess 24 (FIG. 10C) formed on the back surface of the washer body 20. In this case, the fitting portion 24 in FIG. 10A is fitted into the recessed portion 24 in FIGS. 10C and 10D, and the convex portion 29 is inserted into the recessed portion 24 (FIGS. 10C and 10D). Project outside.

  The press contact surface 32 that press-contacts each of the connecting members A and B (FIG. 1C) of the convex portion 29 is in contact with irregularities (including a rough surface) as shown in FIGS. 10A to 10C. It is desirable to increase the resistance. The uneven shape can be an arbitrary shape such as a knurled shape, a diamond shape, a lattice shape, or a groove shape. The convex portion 29 can be coated with a non-slip agent in place of the concave and convex portions.

  The elastic body 23 is brought into pressure contact with each of the connecting materials A and B (FIG. 1C), and by the reaction force (restoring force), the upper washer back surface protrusion 9 and FIG. 1A and FIG. The meshing with the lower washer surface protrusion 10 becomes dense, and the meshing of both becomes difficult to loosen.

[Back washer protrusion on spring washer]
The lower washer back projection 11 may be a spring. The spring may be made of metal or resin. As an example, what is shown in FIGS. 11 (a) and 11 (b) is a structure in which a spring 33 is accommodated and fixed in a recessed portion 24 formed in the washer body 20, and a tip portion thereof protrudes outside the recessed portion 24.

  The spring 33 shown in FIG. 11A has a cylindrical shape (semi-cylindrical shape) with an almost semicircular end surface, and two of them are arranged and accommodated in the recessed portion 24. The spring 33 is formed by bending a plate material, and has an elasticity in which the upper end portion shrinks inward and expands (restores) outward, and is pressed against the inner surface of the recessed portion 24 by the restoring force to form the recessed portion 24. It is locked so that it will not fall off.

  The shape of the spring 33 may be other than those described above. The method of forming the spring 33 depends on the material, but if the material is a thin steel plate, it can be bent into a semi-cylindrical shape, and if it is made of resin, it can be formed.

  The spring 33 shown in FIG. 11B is provided with a locking portion 34 protruding laterally at the upper end portion, and the locking portion 34 is insert-molded in the resin washer body 20. In this case, the distal end portion of the spring 33 is projected outward from the surface of the recessed portion 24. When the washer body 20 is a cast, aluminum alloy, zinc alloy or other molded product, the spring 33 can be insert-molded at the time of casting.

  Both the elastic material fitted and fixed in the recessed portion 24 and the spring 33 are pressed against the connecting material A or B when the head 3 of the screw 2 such as a nut or a bolt is tightened.

(Embodiment 5 of screw with washer)
[When screws are bolts: Fig. 3]
As an example of the screw 1 with a washer of the present invention, what is shown in FIGS. 3A to 3C is a case where the screw 2 is a bolt. The basic configuration and the washer mounting configuration of the bolt portion of the screw 2 are the same as the screws (bolts) shown in FIGS. The difference is that the head back surface protrusion 15 and the upper washer surface protrusion 16 are both chevron shaped. As shown in FIG. 3A, a head back projection 15 is formed on the back surface of the head of the screw 2 and an upper washer surface projection 16 is formed on the surface of the upper washer 5a. The head back projection 15 and the upper washer surface projection 16 are formed. Is a mountain shape that meshes with each other when the screws 2 are tightened. As shown in FIG. 12, the head back surface protrusion 15 and the top washer surface protrusion 16 are formed in a mountain shape that is easy to rotate over the mountain in the tightening direction of the screws 2 and that meshes with each other in the reverse direction and is difficult to reverse or does not reverse. is there. The upper washer back projection 9 of the upper washer 5a shown in FIGS. 3A to 3C has the same configuration as the upper washer back projection 9 of the upper washer 5a shown in FIG. 1A, and the lower washer 5b is shown in FIG. The configuration is the same as the lower washer 5b shown in a).

[When the screws are nuts: Fig. 4]
As an example of the screw 1 with a washer of the present invention, what is shown in FIGS. 4A and 4B is a case where the screw 2 is a nut. The basic configuration of the nut portion of the screw 2 and the washer mounting configuration are the same as those of the screw (nut) shown in FIGS. The difference is that the head back surface protrusion 15 and the upper washer surface protrusion 16 are both chevron shaped. As shown in FIG. 4 (a), a head back protrusion 15 is formed on the back of the head of the screw 2 and an upper washer surface protrusion 16 is formed on the surface of the upper washer 5a, and the head back protrusion 15 and the upper washer surface protrusion 16 are formed. It is a mountain shape that meshes with each other by tightening the screws 2. As shown in FIG. 12, the head back surface protrusion 15 and the top washer surface protrusion 16 are formed in a mountain shape that is easy to rotate over the mountain in the tightening direction of the screws 2 and that meshes with each other in the reverse direction and is difficult to reverse or does not reverse. is there. The upper washer back projection 9 of the upper washer 5a shown in FIGS. 4A and 4B has the same configuration as the upper washer back projection 9 of the upper washer 5a shown in FIG. 2A, and the lower washer 5b is shown in FIG. The same structure as the lower washer 5b shown in FIG.

[Head back protrusion, upper washer surface special machine: Fig. 5]
In the embodiment of FIGS. 3A to 3C and FIGS. 4A and 4B, the upper washer surface protrusion 16, the upper washer back protrusion 9, and the lower washer surface protrusion 10 are all the periphery of the washer body 20. The protrusions 35 are provided at several locations in the direction, and the protrusions 35 have no protrusions 35 (FIGS. 6B and 7B). These protrusions are arranged around the periphery of the washer body 20 as shown in FIG. It can also be provided all around the direction.

(Embodiment 6 of screw with washer)
[In the case of a single washer]
The screw 1 with a washer of the embodiment is a case where there are two washers, and the head of the screw (head shape of a bolt, head shape of a nut) has a hem spreading as shown in FIGS. As shown in FIG. 13 (a), the screw with a washer according to the present invention may be a single washer, and the head 3 of the screw 2 is not widened as shown in FIG. Or other shapes.

  As shown in FIG. 13 (a), when the washer 5 is a single sheet, the back surface protrusion 11 of the washer 5 is a sharpened downward protrusion that can bite into each of the connecting materials A and B (FIG. 1 (c)), or a connection. It may be an elastic material, a spring, or the like that can be pressed against each of the materials A and B (FIG. 1C). In the case of an elastic material, a spring, etc., it can be made the same as in the case of FIGS.

  The shape of the washer surface convex portion 5c in FIG. 13A is a frustum, but the shape may be an elongated rod shape as shown in FIGS. 13B and 13C, and other shapes not shown. May be. The shape of the concave portion 3a on the back surface of the head in FIG. 13 (a) fits with the above and the convex portion 5c on the washer surface so that it does not loosen or hardly loosen in the direction opposite to the tightening direction of the screws 2. In this case, the shape of the head back surface concave portion 3a is made the same as the shape of the washer surface convex portion 5c, and both are fitted to each other so that the screw 2 is not loosened or hardly loosened in the direction opposite to the tightening direction.

(Embodiment 7 of screw with washer)
[Shape of head back surface convex part, washer surface concave part]
The screw 1 with a washer according to the sixth embodiment is a case where the back surface of the head 3 of the screw 2 is provided with a head back surface concave portion 3a and the surface of the washer 5 is provided with a washer surface convex portion 5c. On the contrary, the back surface of the head 3 of the screw 2 may have a convex portion on the back surface of the head, and the surface of the washer 5 may have a concave portion on the surface of the washer. Also in this case, the convex portion on the back surface of the head and the concave portion on the washer surface are fitted to each other so that they are not loosened or hardly loosened in the direction opposite to the tightening direction of the screws.

(Embodiment 8 of screw with washer)
[Arrangement and number of concave parts on the back of the head and convex parts on the washer surface]
The head back surface concave portion 3a and the washer surface convex portion 5c, or the head back surface convex portion and the washer surface concave portion are formed so as to be fitted to each other, but there are two concave portions and convex portions as shown in FIG. They can be arranged side by side, or two can be arranged side by side in the circumferential direction as shown in FIG. The arrangement number, arrangement direction, and arrangement location may be other than this, and if the heads of the screws are rotated in the tightening direction, they can be fitted to each other so that they do not loosen or are not loosened in the opposite direction to the tightening direction. .

(Usage example of screws with washers)
The usage example of the nut with a washer and the bolt with a washer of the present invention will be described with reference to FIG. This use example is an example in the case of connecting and fixing two plate-like connecting materials A and B.
(1) Insert the bolt shaft 13 of the bolt with the washer through the insertion hole of the two connecting members A and B that are overlapped.
(2) A nut with a washer is screwed onto the bolt shaft 13 projecting downward from the lower connecting member A, and the head 3 of the screws 2 is tightened to engage the upper washer back projection 9 and the lower washer surface projection 10. . After that, the lower washer back projection 11 is digged into the lower connecting material A, the upper washer surface convex portion 5c is fitted into the nut or bolt head rear surface recessed portion 3a, and the upper and lower connecting materials A and B are connected. Then, the meshing between the upper washer back projection 9 and the lower washer surface projection 10 meshed with each other is prevented from loosening, and the upper washer surface projection 5c is prevented from loosening from the head or back recess 3a of the nut or bolt.

1 Screws with washers 2 Screws (nuts, bolts)
3 Head 3a Recessed part on the back of the head 4 Caulking shaft 4a Lower end (of the caulking shaft) 5 Washer 5a Upper washer 5b Lower washer 5c Upper washer surface convex (washing surface convex)
5d Pressurized recess (of the top washer surface convex part) 6 Through hole (of the washer body) 8 Back of the head (of the nut) 9 Upper washer back protrusion 10 Lower washer surface protrusion 11 Lower washer back protrusion (washer back protrusion)
12 Back of head (of bolt) 13 Bolt shaft 14 Thread of bolt (of bolt shaft) 15 Back of head projection 16 Upper washer surface projection 20 Washer body 21 Back surface of washer body 22 Projection forming portion 23 Elastic body 24 (Washer body) ) Concave portion 25 (elastic body) tip 26 (elastic body) fitting portion 27 (elastic body fitting portion) lower portion 28 (elastic body fitting portion) upper surface 29 (elastic body) convexity Part 30 Outer peripheral edge 32 (of the washer main body) 32 Pressure contact surface (of the elastic body) 33 Spring 34 (Spring of) locking part 35 Non-protruding part 36 Overcoming slope (of the washer protrusion) 37 (Locking of the washer protrusion) 38 ( Edge line part (of washer protrusion) A, B Connecting material W1 Width of protrusion forming part W2 Width of non-protruding part

Claims (2)

In the screws with washers set so that the washers do not fall off on the back of the heads of the screws such as nuts and bolts,
A head back recess such as a hole or a depression is formed in one or more locations in the circumferential direction of the head back of the screw ,
An upper washer and a lower washer are set on top of each other on the base side of the back of the head of the screw.
In the two washers, the screw bolt shaft or the caulking shaft is inserted into the through hole, and the thread is cut on the outer periphery of the bolt shaft inserted into the through hole so that the screw shaft does not fall off the bolt shaft. Is set so that the two washers are crimped by the caulking shaft inserted into the through hole and do not fall off the caulking shaft,
An upper washer surface convex portion is formed at one or more locations in the circumferential direction of the surface of the upper washer, and an upper washer rear surface protrusion is formed on the rear surface of the upper washer .
And said head rear face recess upper seat gold surface protrusions, can in engagement with each other at the point where the head rear surface recess is formed by clamping the rotation of the screws, Hamagogo the back hard or reverted not shape, size Is,
A lower washer surface protrusion is formed on the surface of the lower washer, and a lower washer rear surface protrusion is formed on the back surface of the lower washer. The upper washer rear surface protrusion and the lower washer surface protrusion are engaged with each other at any location in the circumferential direction of the washer and are difficult to reverse. Or a chevron that does not reverse,
The lower washer back surface protrusion is a protrusion that can bite into or can be pressed into a connecting material connected by the screws.
A screw with a washer characterized by that. In the screws with washers set so that the washers do not fall off on the back of the heads of the screws such as nuts and bolts,
The head back surface convex part is formed in one or more places in the circumferential direction of the head back surface of the screw ,
An upper washer and a lower washer are set on top of each other on the base side of the back of the head of the screw.
In the two washers, the screw bolt shaft or the caulking shaft is inserted into the through hole, and the thread is cut on the outer periphery of the bolt shaft inserted into the through hole so that the screw shaft does not fall off the bolt shaft. Is set so that the two washers are crimped by the caulking shaft inserted into the through hole and do not fall off the caulking shaft,
An upper washer surface concave portion such as a hole or a depression is formed at one or more locations in the circumferential direction of the surface of the upper washer, and an upper washer rear surface protrusion is formed on the back surface of the upper washer .
Shape Theravada gold surface recess and the head rear surface projections can in engagement with each other at the point which is formed the upper seat gold surface recess by tightening rotation of the screws, Hamagogo will not revert difficult or back, size And
A lower washer surface protrusion is formed on the surface of the lower washer, and a lower washer rear surface protrusion is formed on the back surface of the lower washer. The upper washer rear surface protrusion and the lower washer surface protrusion are engaged with each other at any location in the circumferential direction of the washer and are difficult to reverse. Or a chevron that does not reverse,
The lower washer back surface protrusion is a protrusion that can bite into or can be pressed into a connecting material connected by the screws.
A screw with a washer characterized by that.

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