JP6377559B2 - Screws with washers - Google Patents

Description

  The present invention relates to a screw (hereinafter referred to as a “screw with a washer”) provided with a washer at the base of the back surface of the head of a bolt, a nut, a hook, etc. (hereinafter referred to as “screws”: the same in claims). The same applies to the scope of the claims), and particularly relates to a washer and a screw with a washer capable of preventing loosening of the tightened screw.

  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 the screw is tightened, the head protrusion provided on the back of the screw head 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.

  The problem to be solved by the present invention is to provide a screw with a washer that is more difficult to loosen than the screw with a washer of Patent Document 1.

  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. The two washers are stacked on the root side of the back surface of the head of the screw. The protrusion on the surface of the upper washer (hereinafter referred to as “upper washer surface protrusion”) is a protrusion that can be bitten or pressed against the back of the head of the screw by tightening the screw, The protrusion on the surface of the lower washer set under the upper washer (hereinafter referred to as “lower washer surface protrusion”) is a chevron that meshes with each other and is difficult to reverse or does not reverse. The protrusions on the back surface of the protrusions (hereinafter referred to as “lower washer back surface protrusions”) are protrusions that can bite into or be pressed against the connecting material.

  If the upper washer surface protrusion is a protrusion that can bite into the back surface of the head of the screw, and the lower washer back surface protrusion is a protrusion that can bite into the connecting material, the surface or the back surface of the washer substrate is extruded and formed by pressing. Can be formed by extruding meat.

  When the upper washer surface protrusion is a protrusion that can be pressed against the back of the head of the screw, and the lower washer back protrusion is a protrusion that can be pressed against the connecting material, the protrusion is made of an elastic material such as rubber or resin or a spring material, These protrusions can be attached to the upper washer surface and the lower washer back surface.

  The upper washer and the lower washer are preferably attached to the back surface of the head of the screw so as to be horizontally rotatable and slidable in the screw shaft or caulking axis direction of the screw.

  The upper washer back projection and the lower washer surface projection must be engaged at any position in the rotational direction (circumferential direction of the washer). For this purpose, if either the upper washer back projection and / or the lower washer surface projection are provided on the entire circumference of the upper washer back surface and / or the lower washer surface, they can be reliably engaged at any position in the rotational direction. Can do. As long as it can be reliably engaged at any position in the rotational direction, it may be provided only on a part of the circumferential direction of both or either one of the upper washer back surface protrusion and / or the lower washer surface protrusion. As an example, a protrusion forming portion provided near the through hole between the through hole and the outer peripheral edge of the central portion of each washer body, a protrusion forming portion provided near the outer peripheral edge, and both protrusion forming portions It can be formed concentrically with the through hole and the outer peripheral edge in any one or two or more of the protrusion forming portions provided between the through holes and the outer peripheral edge. In this case, the protrusions may be provided at the entire circumference or at several places in the circumferential direction of any one or more of the protrusion forming portions, and the other portions may be non-protruded portions where no protrusions are formed. it can. The upper washer back projection is the back surface of the upper washer and is formed on the back side of the non-projected portion where the upper washer surface projection is not formed. The lower washer surface projection is the lower washer surface and the lower washer back projection is formed. It can be formed on the back side of no protrusions.

  Each of the upper washer surface protrusion and the lower washer back protrusion that can be bitten or pressed can be provided on the entire circumference of the disc-shaped washer substrate or at several places in the circumferential direction.

  The upper washer surface protrusion that can be bitten or press-contacted is the surface of the upper washer body on the opposite side of the no-projection part, and the lower washer back protrusion that can be bited or press-contacted is the back face of the lower washer body and is said no-projection It is desirable to provide on the opposite side of the part.

The screw with washer of the present invention has the following effects.
(1) Two washers are set up and down on the back of the head of the screw, and the upper washer surface protrusion is a protrusion that can bite or press against the back of the head of the screw. The washer surface protrusions mesh with each other and are not easily loosened or do not loosen, and the lower washer back protrusion is a protrusion that can be bitten into or pressed against the fastening material, so that the tightened screws are difficult to loosen.
(2) Two washers are set up and down on the back of the head of the screw, and the upper washer surface protrusion can bite into or press against the head protrusion of the screw. The upper washer back protrusion and the lower washer surface Since the protrusions engage with each other and have a mountain shape that is difficult to loosen or does not loosen, and the lower washer back protrusion can bite into or be pressed against the fastening material, the tightened screws are less likely to loosen.

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 a washer, (b) is a front view after combining a nut and a washer. It is an example in case the screw with a washer of this invention is a bolt, (a) is a front view which shows the state before combining a bolt and a washer, (b) is a front view after combining a bolt and a washer, (c). FIG. 4 is an explanatory diagram when fixing an object using a nut with a washer and a bolt with a washer. It is an example of the top washer used for the screws with a washer of the present invention, and is a case where a projection forming part 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 a washer. (C) is XX sectional drawing of (b), (d) is a top view at the time of providing a protrusion in the perimeter of a washer main body. 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 forming part is formed in the radial direction middle part of a washer body, (a) is a top view, and (b) is the back of a washer. A top view and (c) are XX sectional views of (b). It is an example of the upper washer used for the screws with a washer of the present invention, and is a case where a projection forming part is formed at a location closer to the inner side in the radial direction of the washer body, (a) is a plan view, and (b) is a washer. The back surface top view of (b), XX sectional drawing of (b). It is an example of the upper washer used for the screws with the washer of the present invention, and is a case where the protrusion forming portion is formed at a location near the radial outer periphery and a location near the radial inner side of the washer body, (a) Is a plan view, (b) is a back plan view of the washer, and (c) is an XX cross-sectional view of (b). When the upper washer surface protrusion is an elastic body, (a) is a plan view when the protrusion is a triangle, (b) is a plan view when the protrusion is a star, and (c) is a spherical protrusion. (D) is a plan view when the protrusion is an elongated protrusion. Sectional detail drawing in case an upper washer surface protrusion and a lower washer back surface protrusion are elastic bodies. (A) and (b) are cases where the upper washer surface protrusion and the lower washer rear surface protrusion are elastic bodies, and are explanatory diagrams of different shapes when the elastic body protrusions are ring-shaped, and (c) is (a) or ( The top view of a washer provided with the protrusion of b), (d) is XX sectional drawing of (c). (A) and (b) are sectional views of a washer provided with springs having different shapes when the upper washer surface protrusion and the lower washer rear surface protrusion are springs. 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.

  Examples of the screws with washers of the present invention are shown in FIGS. FIG. 1 shows a case where the screw 2 is a nut, and FIG. 2 shows a case where the screw 2 is a bolt.

(Embodiment 1 of screw with washer)
An example of the screw 1 with a washer according to the present invention is shown in FIG. 1B when the screw 2 is a nut, and the caulking shaft 4 protruding from the back surface of the head 3 of the screw 2 has two The sheet washers 5a and 5b are stacked one on top of the other, and the lower end 4a of the caulking shaft 4 is folded outward and crimped to the outer peripheral edge of the through hole 6 of the washer body to attach the washer to the nut 2 and caulking by swaging. It is designed not to fall out of 4. In this case, the upper washer 5a and the lower washer 5b are caulked with such a strength that they can be rotated horizontally and slid up and down (not too caulking). The two washers 5 a and 5 b are set so as to be slidable in the horizontal direction and in the axial direction of the crimping shaft 4.

  An upper washer surface protrusion 7 is formed on the surface of the upper washer 5a in FIG. The upper washer surface projections 7 are projected at equal intervals at four locations in the circumferential direction of the upper washer 5a. The upper washer surface protrusion 7 is a protrusion that can be bitten or pressed against the smooth back surface 8 of the screw 2 when the screw 2 is tightened. An upper washer back projection 9 projects from the back surface of the upper washer 5a, and a lower washer surface projection 10 projects from the surface of the lower washer 5b. The upper washer back projection 9 and the lower washer surface projection 10 need to be engaged at any position in the rotational direction (circumferential direction of the washer). The upper washer back projection 9 and the lower washer surface projection 10 shown in FIG. 3B, FIG. 4B, FIG. 5B, and FIG. 6B are all provided at four locations in the circumferential direction. Also in this case, both the protrusions 9 and 10 have a portion, length, or number of peaks that are always engaged at any position in the rotational direction. Both of the projections 9 and 10 shown in the figure are chevron-shaped, and are easy to rotate over the mountain in the tightening direction of the screws 2, but are in a chevron shape that meshes with each other in the reverse direction and is difficult to reverse or does not reverse.

  A lower washer back projection 11 is provided on the back surface of the lower washer 5b. The lower washer back projection 11 is a projection that can bite into or press contact with the upper connecting material B of the two connecting materials A and B (FIG. 2C) to be connected. The lower washer rear surface protrusions 11 are provided at four equal intervals in the circumferential direction of the lower surface of the lower washer 5b.

  The upper washer back projection 9 and the lower washer surface projection 10 can be crossed over each other in the rotational direction of the screw 1, but have a mountain shape that does not reverse or hardly (does not loosen or loosen).

(Embodiment 2 of screw with washer)
As another example of the screw 1 with a washer according to the present invention, FIG. 2B shows a case where the screw 2 is a bolt, and a screw is attached to a bolt shaft 13 protruding from the back surface 12 of the head 3 of the screw 2. Before the crest 14 (FIG. 2 (c)) is formed, the two washers 5a and 5b are set up and down on the neck portion (the portion without the thread) of the bolt shaft 13. In this case, the two washers 5 a and 5 b are set so as to be slidable in the horizontal direction and 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.

  The upper washer 5a in FIG. 2 (a) is the same as the upper washer 5a in FIG. 1 (a), and an upper washer surface projection 7 is projected on the surface, and an upper washer back projection 9 is formed on the rear surface. The lower washer 5b in FIG. 2 (a) is the same as the lower washer 5b in FIG. 1 (a), and an upper washer surface protrusion 10 is provided on the surface, and a lower washer back protrusion 11 is formed on the back surface.

  The upper washer surface protrusion 7 can bite or press into the flat rear surface 12 (FIG. 2A) of the head 3 of the screw 2 by tightening the screw 2. The upper washer surface projections 7 are projected at equal intervals at four locations in the circumferential direction of the upper washer 5a. The lower washer back surface protrusion 11 is a protrusion that can bite into or press contact with the upper connecting material B of the two connecting materials A and B (FIG. 2C) to be connected. The lower washer rear surface protrusions 11 are provided at four equal intervals in the circumferential direction of the lower surface of the lower washer 5b.

  Both the upper washer back projection 9 and the lower washer surface projection 10 are chevron-shaped, and are easy to rotate over the mountain in the tightening direction of the screws 2, but in the reverse direction, they are meshed with each other so that they do not easily reverse or do not reverse. is there.

(Upper washer in Figs. 1 and 2)
Various examples of the upper washer 5a shown in FIGS. 1 (a) and 2 (a) are shown in FIGS. The upper washer 5 a has a through hole 6 in the center of a disc-shaped washer body 20, an upper washer surface protrusion 7 on the surface, and an upper washer back protrusion 9 on the back surface of the washer body 20. The through hole 6 has a diameter into which a cylindrical caulking shaft 4 (FIG. 1) and a bolt shaft 13 (FIG. 2) protruding from the back surface of the head 3 of the screw 2 can be inserted.

  The upper washer surface protrusion 7 of the upper washer 5a shown in FIG. 3 to FIG. 6A is provided with four protrusions at equal intervals in the circumferential direction of the washer body 20, and has a triangular pyramid or conical sharp shape, It is hardened and hardened so that it can easily bite into the back face 8 of the nut (FIG. 1A) and the back face 12 of the bolt (FIG. 2A). The upper washer surface protrusion 7 can be formed by extruding the surface of the washer body 20 with a press machine and protruding the meat of the washer body 20. In this case, a concave portion 7 a formed by extrusion molding is formed on the entire circumference or a part of the periphery of the base of the upper washer surface protrusion 7 so as to be recessed by one step from the back surface of the washer body 20. In this recess 7a, the connecting member meat that rises when the upper washer surface protrusion 7 bites into the head back surface 8 of the nut or the bolt head back surface 12 by tightening the screws 2 bites into the recess 7a. The slipping of the upper washer 5a is prevented.

(Upper washer surface protrusion by elastic material)
The upper washer surface protrusion 7 may be in pressure contact with the nut head back surface 8 (FIG. 1A) and the bolt head back surface 12 (FIG. 2A). In this case, the washer surface protrusion 7 can be made of an elastic material such as rubber or silicon, or a spring.

  The upper washer surface projection 7 shown in FIG. 7A 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. 8), and the distal end portion 25 of the elastic body 23 is projected out of the recessed portion 24.

  The upper washer surface protrusion 7 shown in FIG. 7B 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. 8), the distal end portion 25 of the elastic body 23 protrudes out of the recessed portion 24.

  The upper washer surface protrusion 7 shown in FIG. 7C 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 upper washer surface projection 7 shown in FIG. 7D accommodates and fixes the elongated elastic body 23 in the shape 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. 9A is formed by protruding projections 29 at four intervals in the circumferential direction of the ring-shaped fitting portion 26 at intervals of 90 degrees. As shown in FIG. 9A, the cross-sectional shape of the fitting portion 26 is a circular arc at the lower portion 27, a semicircular arc shape at the upper surface 28, and a 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. 9A can be fitted into a ring-shaped recessed portion 24 formed on the back surface of the washer body 20 as shown in FIG. 9C. In this case, the fitting portion 24 in FIG. 9A is fitted into the recessed portion 24 in FIGS. 9C and 9D, and the convex portion 29 is protruded out of the recessed portion 24.

  Among the convex portions 29, a pressure contact surface that is in pressure contact with the nut head back surface 8 (FIG. 1A), the bolt head back surface 12 (FIG. 2A), and the connecting member A (FIG. 2C). As shown in FIGS. 9 (a) to 9 (c), it is desirable that the surface 32 has irregularities (including a rough surface) so as to increase the contact 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 formed by tightening the screws 2 to make the smooth back surface 8 of the nut (FIG. 1A), the smooth back surface 12 of the bolt 12 (FIG. 2A), or the connecting material A (FIG. 2). (C)), the reaction force (restoring force) of the upper washer back projection 9 and the lower washer surface projection 10 in FIG. 1 (a) and FIG. Ensure that the meshing is less likely to loosen.

(Upper washer surface protrusion by spring protrusion)
The upper washer surface protrusion 7 may be a spring. The spring may be made of metal or resin. As an example, what is shown in FIGS. 10 (a) and 10 (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. 10A 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. 10B 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.

  When the elastic body 23 and the spring 33 fitted and fixed in the recessed portion 24 are tightened with the head 3 of the screw 2 such as a nut or a bolt, the back surface 8 (FIG. 1 (a)) of the nut or the head of the bolt. It is press-contacted to the rear surface 12 (FIG. 2A) or the connecting material A or B.

(Upper washer back projection)
The upper washer back projection 9 of the upper washer 5a shown in FIGS. 1 and 2 is between the through hole 6 in the center of the washer body 20 and the outer peripheral edge 30 as shown in FIG. It is formed concentrically with the through-hole 6 and the outer peripheral edge 30 at several locations (four locations) close to 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.

  The protrusion forming portion (intermediate protrusion forming portion) 22 in FIG. 4B is formed in a ring shape substantially in the middle between the outer peripheral edge 30 of the washer body 20 and the through hole 6, and the protrusion forming portion (inner protrusion in FIG. 5B). The forming portion 22 is formed in a ring shape at a location near the through hole 6 of the washer body 20, and the protrusion forming portion 22 of FIG. 6B is a location near the outer peripheral edge 30 of the washer body 20 and a location near the through hole 6. Both are formed in a ring shape.

  3B, 4B, 5B, and 6B, the upper washer back surface protrusions 9 are formed at four positions in the circumferential direction of the respective protrusion forming portions 22, and the other four. The location is a no-projection portion 35 without the upper washer back projection 9. 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 surface projection 7 of FIGS. 1A and 2A is provided on the surface of the washer body 20 on the opposite side of the non-projection portion 35.

  Each of the upper washer back projections 9 has a chevron shape that meshes with the lower washer surface projection 10 of the lower washer 5b. As shown in FIGS. 11A and 11B, 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. 11A, the top portion of the ridge line portion 38 has an arc surface shape, and meshes with the lower washer surface protrusion 10 (FIGS. 1A and 2A) formed on the lower washer 5b. Therefore, it is difficult to be chipped or crushed. The top part of the ridge line part 38 can also be planar as shown in FIG.11 (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. The protruding dimensions of the upper washer back projection 9, the inclination angle of the overpass slope 36, the inclination angle of the locking surface 37, the arc surface radius R of the ridge line portion 38, the planar width in the case of a planar shape, etc. are the diameter (large) of the washer body 20. And can be designed as appropriate according to 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 of FIGS. 1 and 2)
The lower washer 5b in FIGS. 1 (a) and 2 (a) is disposed below the upper washer 5a and meshes with the upper washer 5a. The lower washer surface protrusion 10 is provided on the surface, and the lower washer back surface is provided on the rear surface. There is a protrusion 11. 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. Other structures are the same as the upper washer 5a.

(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 bites into the lower connection material A, and the upper washer surface projection 7 bites into or presses against the head of the nut or bolt to connect the upper and lower connection materials A and B. The meshing of the upper washer back projection 9 and the lower washer surface projection 10 that are engaged with each other is prevented from loosening, and the upper washer surface projection 7 is prevented from loosening from the back of the nut or bolt head.

(Other examples)
In order for the upper washer back projection 9 and the lower washer surface projection 10 to be engaged at any position in the rotational direction (circumferential direction of the washer), either or both of the upper washer back projection 9 and the lower washer surface projection 10 are used. As shown in FIG. 3D, it can be provided on the entire circumference in the circumferential direction of the upper washer back surface and / or the lower washer surface.
Further, when the upper washer back projection 9 and the lower washer surface projection 10 are provided at several locations, the width W1 (FIG. 3B) of the projection formation location is determined from the width W2 of the non-projection portion 35 (FIG. 3B). It is preferable that the protrusions 9 and 10 mesh with each other at any position in the circumferential direction of the washer.

1 Screws with washers 2 Screws (nuts, bolts)
3 Head 4 Caulking shaft 4a Lower end portion (of caulking shaft) 5a Upper washer 5b Lower washer 6 Through hole (of washer body) 7 Upper washer surface protrusion 7a Recessed portion (around upper washer surface protrusion) 8 (Nut) head Back part 9 Upper washer back protrusion 10 Lower washer surface protrusion 11 Lower washer back protrusion 12 Head back face (bolt) 13 Bolt shaft 14 (Bolt shaft) thread 20 Washer body 21 (Washer body) back face 22 Projection forming part 23 Elastic body 24 Recessed portion (of the washer body) 25 Tip portion (of the elastic body) 26 Fitting portion of the elastic body 27 Lower portion of the elastic body fitting portion 28 Upper surface of the elastic body fitting portion 29 (elastic body) convex part 30 (outside edge of washer body) 32 (elastic body) pressure contact surface 33 spring 34 (spring) locking part 35 no projection part 36 (washer projection) overpass slope 37 (washer projection) Locking surface 38 (Washer projection) ) Ridge portion A, the width of the width W2 no protrusions B coupling member W1 projection formation location

Claims (5)

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,
Two washers are set up and down on the base side of the back of the head of the screw.
Each of the upper washer and the lower washer can be horizontally rotated and slid separately , attached to the back of the head of the screw,
The upper washer has an upper washer surface protrusion on the front surface and an upper washer rear surface protrusion on the rear surface. The upper washer surface protrusions are individually scattered at intervals in the circumferential direction of the washer surface. The part is extruded by a press machine and protrudes, and is a protrusion that can bite into the flat back of the head of the screw by tightening the screw,
The lower washer has a lower washer surface protrusion on the front surface and a lower washer rear surface protrusion on the back surface, and the lower washer rear surface protrusion is scattered at intervals in the circumferential direction of the back surface, and bites into the connecting material by tightening screws. A protrusion that is possible or press-contactable,
The upper washer back projection and the lower washer surface projection are chevron that can mesh with each other, and the chevron of both projections has a climbing slope, a locking surface, and a ridgeline, and the climbing slope is formed closer to the rotation direction than the ridgeline. The ridgeline part is formed at the top of the mountain where the overhanging slope and the locking surface intersect, the top of the ridgeline part is arcuate,
The slope where the upper washer back projection and lower washer surface projection cross over the top of the lower washer surface projection in the tightening rotation direction of the screws, and the locking surface of both projections is opposite to the tightening rotation direction. In the direction of loose rotation in the direction, it is an inclination that meshes with each other and is difficult to reverse or does not reverse.
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,
Two washers are set up and down on the base side of the back of the head of the screw.
Each of the upper washer and the lower washer can be horizontally rotated and slid separately , attached to the back of the head of the screw,
The upper washer has an upper washer surface protrusion on the front surface and an upper washer rear surface protrusion on the rear surface. The upper washer surface protrusions are individually scattered at intervals in the circumferential direction of the washer surface. The part is extruded by a press machine and protrudes, and is a protrusion that can bite into the flat back of the head of the screw by tightening the screw,
The lower washer has a lower washer surface protrusion on the front surface and a lower washer rear surface protrusion on the back surface, and the lower washer rear surface protrusion is scattered at intervals in the circumferential direction of the back surface, and bites into the connecting material by tightening screws. A protrusion that is possible or press-contactable,
The upper washer back projection and the lower washer surface projection are chevron that can mesh with each other, and the chevron of both projections has a climbing slope, a locking surface, and a ridgeline, and the climbing slope is formed closer to the rotation direction than the ridgeline. The ridgeline part is formed at the top of the mountain where the overpass slope and the locking surface intersect, the top of the ridgeline part is planar,
The slope where the upper washer back projection and lower washer surface projection cross over the top of the lower washer surface projection in the tightening rotation direction of the screws, and the locking surface of both projections is opposite to the tightening rotation direction. In the direction of loose rotation in the direction, it is an inclination that meshes with each other and is difficult to reverse or does not reverse.
A screw with a washer characterized by that. In the screw with washer according to claim 1 or 2,
The upper washer surface protrusion is made of an elastic material such as rubber or resin or a spring material, and the protrusion made of the elastic material or the spring material is attached to the surface of the upper washer.
A screw with a washer characterized by that. In the screw with washer according to claim 1 or 2,
The lower washer back protrusion is made of an elastic material such as rubber or resin or a spring material, and the protrusion made of the elastic material or the spring material is attached to the back surface of the lower washer.
A screw with a washer characterized by that. The screw with a washer according to any one of claims 1 to 4,
The upper washer back surface protrusion is the back surface of the upper washer, and is formed on the back side of the non-projection part where the upper washer surface protrusion is not formed,
The lower washer surface protrusion is the lower washer surface, and is formed on the back side of the non-protruding portion where the lower washer back protrusion is not formed.
A screw with a washer characterized by that.

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