JP4602463B1 - Screws with washers and washer fittings - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screw with a washer capable of preventing loosening, a screw, a washer, and a washer attachment.
A washer having a washer protrusion formed to engage with the head protrusion is disposed on the back side of the screw having a head protrusion formed on the back surface of the head of a screw such as a nut or a bolt. The screws and the washer were connected by a washer mounting tool, and the washer mounting tool was a screw with a washer with its head side mounting portion locked to the head of the screw and the hem side mounting portion locked to the washer. In a screw having a head protrusion formed on the back surface of the head of a screw such as a nut or bolt, a head locking portion is formed on the head, and this head locking portion is on the head side of the washer attachment The mounting portion is a screw that can be locked. It has a cylindrical main body that can be put on the outer periphery of the head of a screw such as a nut or a bolt and the washer arranged on the back side of the screw, and a hem side mounting portion that can be attached to the screw on the main body, and a washer A washer attachment was provided with an attachable washer side attachment.
[Selection] Figure 1

Description

The present invention nuts, and washers with screws fitted with washer head rear surface of the screw such like bolts, relates washers fixture can be set the washer head rear surface of the worm child class.

  2. Description of the Related Art Conventionally, there have been screws that are set so that a lock washer for locking is not dropped on the back of the head of a screw such as a bolt or nut (hereinafter simply referred to as “screw”). There is.

The screw of Patent Document 1 is pre-attached to the engagement skirt that projects continuously and integrally from the bottom surface of the head of the screw so that the central hole of the disc spring washer is relatively free-movable and tightened. The restoring force of the disc spring washer prevents the screws from loosening.
In the screw of Patent Document 2, a washer is attached to the neck part under the head of the screw, and when the screw is tightened, the chevron protrusions provided on the back surface of the head of the screw and the surface of the washer mesh with each other. To prevent loosening of the screws.

JP 2002-122120 A JP 2006-242324 A

In Patent Document 1, the mounting of the disc spring washer to the engagement skirt was troublesome, and in Patent Document 2, the mounting of the washer to the neck portion on the back side of the head of the screw was troublesome.
In Patent Documents 1 and 2, since the washer is loosely attached with a play on the neck of the screw, the shaft center of the screw and the center of the center hole of the washer are easily misaligned, and the angle protrusions of the screws are There has been a problem that the locking of the is easy to loosen.

An object of the present invention is to provide the the washer with screws which can solve the problems, a washer mounting jig can be attached easily to washer the screws.

The screw with a washer of the present application is a screw with a washer in which a washer 8 is disposed on the back side of the head 4 of the screw 1 and the washer 8 is attached to the screw 1 with a washer fitting 2. The head projection 14 is formed on the back surface of the head 4, and the washer 8 has a washer projection 15 that can be engaged with the head projection 14 formed on a surface facing the head projection 14. The mounting tool 2 covers the head-side mounting portion 3, the head opening 30, the peripheral wall 7 divided into two or more in a cylindrical shape or in the circumferential direction, the skirt-side mounting portion 6, and the screws 1. A lower end opening 10 is formed, and the washer fitting 2 covers the head 4 of the screw 1, and the head-side attachment 3 is formed on the inclined surface 5 or the head 4 of the screw 1. The distal end side of the head 4 of the screw 1 protrudes from the head opening 30 by being locked to the stop. The peripheral wall 7 covers the outer periphery of the washer 8, the hem side attachment portion 6 is engaged with the washer engagement portion 9 of the washer 8, and the washer 8 is engaged with the screws 1 by the washer attachment device 2. There is a gap 25 between the projection 14 and the washer projection 15, and the washer 8 is slidable in the gap 25, and the head projection 14 and the washer projection 15 are engaged by screwing the screws 1. is there.

The washer 8 may be provided with a biting protrusion 16 protruding on the back surface of the washer 8 that protrudes further forward than the back surface.

The washer 8 is formed such that the washer locking portion 9 is recessed by one step from the outer peripheral surface of the washer 8, and the washer mounting tool 2 can be locked to the washer locking portion 9 by its hem side mounting portion 6. Thus, it may be formed so as to protrude inside the peripheral wall 7.

The washer 8 has a washer locking portion 9 formed on the back surface of the washer 8, and the washer fitting 2 has the lower end of the peripheral wall 7 inward so that the hem side mounting portion 6 can be locked to the washer locking portion 9. It can also be formed by bending.

The washer attachment of the present invention is a washer attachment 2 in which a washer 8 is attached to the back side of the head 4 of the screw 1, and the washer attachment 2 covers the head 4 of the screw 1 with its inclined surface 5 or A head-side mounting portion 3 that can be locked to a screw locking portion formed on the head 4, and a head that is open at the top of the head-side mounting portion 3 so that the distal end side of the head 4 can protrude. An opening 30, a cylindrical wall covering the outside of the washer 8 from the inclined surface 5, or a peripheral wall 7 divided into two or more in the circumferential direction, a hem side attachment portion 6 that can be locked to the washer 8, and the screws 1 A lower end opening 10 that can be covered is provided, and when the head 4 of the screw 1 is covered, the head-side attachment portion 3 is related to the inclined surface 5 of the screw 1 or a screw locking portion formed on the head 4. The front end side of the head 4 protrudes from the head opening 30, the peripheral wall 7 covers the outer periphery of the washer 8, and the hem side The attaching portion 6 is engaged with the washer engaging portion 9 of the washer 8, and a gap 25 is formed between the screw 1 and the washer 8 so that the washer 8 can slide, and the washer 8 is attached to the screw 1. Is.

The washer mounting tool of the present invention is the above-described washer mounting tool, wherein incisions 11 are provided in the longitudinal direction at several locations in the circumferential direction of the cylindrical peripheral wall 7, and the notches 11 are opened at the lower end of the peripheral wall 7, so A restoring force can also be provided in the diameter and diameter reduction directions. The skirt side attachment portion 6 of the peripheral wall 7 may be formed so as to protrude to the inside of the peripheral wall 7 so that it can be locked to a washer locking portion 9 formed to be recessed by one step from the outer peripheral surface of the washer 8. it can. The bottom end portion of the peripheral wall 7 may be formed by bending the lower end of the peripheral wall 7 inward so that the skirt side attachment portion 6 of the peripheral wall 7 can be locked to a washer locking portion 9 formed on the bottom surface of the washer 8. .

The screw with washer of the present invention has the following effects.
(1) Since the washer is attached to the inside of the washer attachment, there is no trouble of setting the washer one by one during the tightening operation of the screws.
(2) Since the washer is provided with a washer projection that can mesh with the head projection of the screw, the washer projection and the head projection can be reliably meshed with each other simply by tightening the screw, so that the screw is difficult to loosen.
(3) If the inner diameter of the washer fitting is the same as the outer circumference of the washer, the washer will not fall off simply by pushing (setting) the washer into the washer fitting, and it will be troublesome to perform caulking work to prevent the washer from falling off. There is no.
(4) Since the washer set in the washer attachment is positioned by the washer attachment and is not displaced, the engagement between the head projection of the screw and the washer projection of the washer is ensured and the screws are not easily loosened.
(5) If the inner diameter of the washer attachment is made slightly larger than the outer periphery of the washer, the washer will not come off the screws just by tightening the hem of the washer attachment after inserting the washer inside the washer attachment. Easy to install the washer

(6) Since the head side mounting portion that can lock the washer mounting tool is on the outer periphery or the bottom surface of the head, locking (attaching) of the washer mounting tool to the screws is easy and reliable.

(7) Since the washer locking portion that can lock the washer mounting member is provided, it is easy to mount the washer mounting member.
(8) Since there is a biting projection on the back surface of the washer, if the screws are tightened, the biting projection bites into the body to be tightened, so that the washer is difficult to loosen and the screws are also difficult to loosen.
(9) When the biting protrusion on the back surface of the washer is formed on the back surface of the washer surface where there is no washer protrusion, the biting protrusion is crushed when the washer protrusion is pressed, or Since the protrusions are not crushed, the formation of the protrusions is facilitated, the defect rate of the protrusions to be formed is reduced, and the yield is improved, so that the washer manufacturing cost is reduced.
(10) A ring-shaped outer groove is formed in the circumferential direction of the back surface of the washer substrate so as to be recessed from the back surface of the washer substrate, and there are biting protrusions that can bite into the clamped body at several places in the circumferential direction of the outer groove. Since it is formed so as to protrude from the back surface and the recess is formed in the outer periphery of each biting projection so as to be recessed from the back surface of the washer substrate, the washer is incorporated into the screws by the washer mounting tool of the present application and tightened with the screws. Even if the screws are loosened and tightened again after tightening to the body to be tightened, the meat of the body to be tightened that has risen due to the biting protrusions biting into the body to be tightened during the previous tightening passes through the outer groove when tightening again. Therefore, it is possible to secure the tightening again without interfering with the washer tightening, and secure the tightening even after repeated use.

The washer fitting of the present application has the following effects.
(1) Since it has a cylindrical shape that can be put on the outer periphery of the head of the screw and the washer arranged on the back surface side thereof, it can be easily attached to the screw.
(2) Since the head-side mounting portion that can be locked to the head locking portion of the screw and the hem-side mounting portion that locks to the washer locking portion of the washer are provided, the screw and the washer can be connected. Easy.

Sectional drawing which shows an example of the screws with a washer of this invention. An example of the washer attachment tool of the present invention is shown, (a) is a plan view of (b), (b) is a sectional view of (a), and (c) is a bottom view of (b). The external view which shows the other example of the washer attachment tool of this invention. (A) is another example of the screw with a washer of the present invention, and is a cross-sectional view of an example in which a washer locking portion is provided on the bottom surface of the washer, and (b) is used for the screw with a washer of (a). Sectional drawing of a washer attachment tool. (A) is another example of the screw with a washer of the present invention, and is a cross-sectional view when the peripheral wall of the washer attachment is straight, and (b) is a washer attachment used for the screw with a washer in (a). Sectional drawing of a tool, (c) is a bottom view of (a). (A) is other examples of the screw with a washer of the present invention, and is a sectional view in case the peripheral wall of a washer attachment tool is divided into four parts, (b) is a bottom view of (a). (A) is another example of the screw with a washer of the present invention, and is a cross-sectional view when the screw is a bolt, and (b) is a cross-sectional view of a washer used for the screw with a washer of (a). It is an example of the washer used for the screws with the washer of the present invention, where (a) is a plan view, (b) is a side view, (c) is a back view, and (d) is a bite formed on the back surface. Detailed explanatory drawing which shows protrusion and the recessed part currently formed in the circumference | surroundings. The fragmentary sectional view which shows the usage example of the screws with a washer of this invention. (A) is a back view showing an example of a washer used for the screw with washer of the present invention, and (b) to (d) are biting protrusions formed on the back surface of the washer and recesses formed around the back surface. Detailed explanatory drawing. (A) is a fragmentary sectional view which shows an example of the screw projection of the screw used for the screw with a washer of the present invention, and (b) is the washer projection and the biting projection of the washer used for the screw with a washer of the present invention. FIG. 4 is a detailed explanatory view of the concave portion, and FIG. Sectional drawing which shows the other examples of the screws and washers in this invention. (A) is a back view which shows the other example of the washer in this invention, (b) is sectional drawing of (a).

(Embodiment 1 of screw with washer)
An example of a screw with a washer according to the present invention is shown in FIG. 1 in the case where the screw 1 is a nut, and the screw 1 is covered with a washer fitting 2 from above, so that the upper of the washer fitting 2 is narrowed. The head side attachment portion 3 is locked to the inclined surface 5 of the head 4 of the screw 1, and the hem side attachment portion 6 of the washer attachment 2 is accommodated (set) inside the peripheral wall 7 of the washer attachment 2. The washer 8 is attached to the screws 1 so as not to fall off by being engaged with a washer engaging portion 9 formed on the side surface of the washer 8. A head projection 14 is formed on the back surface of the head of the screw 1, and a washer projection 15 is formed on the surface of the washer 8. There is a gap 25 between both projections, and the washer 8 is vertically moved between the gaps 25. It is possible to slide. The bottom surface of the washer 8 protrudes below the hem of the peripheral wall 7 of the washer attachment 2.

  The head-side mounting portion 3 is tapered toward the upper side, and its inner diameter is made smaller than the inclined surface 5 of the head 4 of the screw 1, and the washer mounting tool 2 is put on the screw 1, the head The side attachment portion 3 is automatically locked to the inclined surface 5 of the head 4 of the screw 1.

  The skirt side attaching portion 6 is formed into a substantially hemispherical protrusion by pushing inward several places in the circumferential direction of the peripheral wall 7. The washer locking portion 9 is formed by making the outer peripheral portion of the bottom surface of the washer 8 one step lower than the bottom hole central hole P side of the washer 8.

  As shown in FIGS. 2 (a) to 2 (c), the washer attachment 2 has a restoring force capable of expanding and reducing the diameter of the peripheral wall 7 by making cuts 11 in the vertical direction at several positions in the peripheral direction of the peripheral wall 7. Thus, when the washer attachment tool 2 is placed on the screws 1 and the hem side attachment portion 6 of the peripheral wall 7 is set on the washer locking portion 9 of the washer 8, the peripheral wall 7 expands in diameter and the hem side attachment portion 6 It is also possible to lock the washer 8 to the washer locking portion 9 without difficulty and to automatically reduce the diameter of the peripheral wall 7 after the locking so that the washer 8 is held.

(Embodiment 2 of screw with washer)
As another example of the screw 1 with a washer of the present invention, the screw shown in FIGS. 4A and 4B is also a case where the screw 1 is a nut, and its basic configuration is the same as that shown in FIG. As shown in FIG. 4 (b), the lower end (hem) 12 of the peripheral wall 7 of the washer fitting 2 is bent inward to form the skirt side attachment 6, and the washer fitting 2 is screwed. 1 is attached to the inclined surface 5 of the screw 1, and the peripheral wall of the washer fitting 2 from the lower end opening 10 of the hem 12 of the washer fitting 2. 7, the washer 8 is pushed into and set in the base 7, and the hem side attachment portion 6 is locked to the washer locking portion 9 of the washer 8. Also in this case, as shown in FIG. 4 (b), the washer attachment tool 2 is obtained by making incisions 11 in the longitudinal direction at several places in the circumferential direction of the peripheral wall 7 to give the peripheral wall 7 a restoring force capable of expanding and reducing the diameter. When the hem side attaching portion 6 of the peripheral wall 7 is set on the washer engaging portion 9 of the washer 8 by covering the screw 1 with the screw 1, the peripheral wall 7 is expanded in diameter and the hem side attaching portion 6 is the washer engaging portion of the washer 8. The peripheral wall 7 is automatically reduced in diameter after being locked, and the washer 8 is held.

(Embodiment 3 of screw with washer)
In the embodiment of FIG. 1, the hemispherical hem side locking portion 6 protrudes from the inside of the peripheral wall 7, and in the embodiment of FIGS. 4A and 4B, the hem side attachment portion 6 connects the skirt 12 of the peripheral wall 7. In the present invention, it is formed before the washer is set by bending inwardly. However, in the present invention, the skirt 12 of the peripheral wall 7 of the washer fitting 2 is kept straight as shown in FIG. After the washer 8 is accommodated in the peripheral wall 7 from 10, the skirt 12 of the peripheral wall 7 is bent inward as shown in FIG. It can also be locked. Also in this case, as shown in FIG. 3, if the circumferential wall 7 is provided with incisions 11 in the longitudinal direction and the circumferential wall 7 is provided with a restoring force capable of expanding and contracting, the bottom of the circumferential wall 7. It becomes easy to bend 12 inside.

(Embodiment 4 of screw with washer)
FIGS. 6A and 6B show an example of the screw 1 with a washer of the present invention before the washer is attached. The basic structure of the screw 1 with a washer is the same as that of FIGS. 1A, 1B, 4A, and 4B, and the difference is that the peripheral wall 7 of the washer mounting tool 2 is moved in the circumferential direction. A hemispherical hem-side attachment portion 6 projecting inwardly is formed on each peripheral wall 7, and the hem-side attachment portion 6 is attached to a washer locking portion 9 (see FIG. 1). The washer 8 can be held by being locked to FIG.

(Embodiment 5 of screw with washer)
FIGS. 7A and 7B show another example of the screw 1 with a washer according to the present invention, in which the screw 1 is a bolt having a screw rod 13 under the head 4. The configuration other than that provided is the same as in the first to fourth embodiments.

(Embodiment 6 of screw with washer )
An example of an embodiment of the screw 1 according to the present invention is shown in FIG. The screw 1 is a nut, and a chevron-shaped head protrusion 14 shown in FIG. 1 is continuously formed radially around the back surface of the head 4 as shown in FIG. The number of crests and grooves of the head projection 14 and the inclination angle of the crest are designed so that they can mesh with the washer projection 15 on the surface of the washer 8. The angle of the head protrusion 14 can be arbitrarily selected. As shown in FIG. 11 (a), a gently sloping tightening slope 14a is formed on the front side in the tightening direction (left side of FIG. 11 (a)), and the rear side in the tightening direction opposite to that (right side of FIG. 11 (a)). It has a mountain shape provided with a sloping stop slope 14b having a steep slope. The shape of the head protrusion 14 is not limited to that shown in FIG. 11A, and the inclination angle of the tightening slope 14a and the locking stopper 14b can be selected to be an angle suitable for fastening and locking.

(Embodiment 7 of screw with washer )
In FIG. 1, the head side attachment portion 3 of the washer attachment 2 is locked to the inclined surface 5 of the screw 1, but the screw 1 in the present invention is not locked to the inclined surface 5, but is inclined. In addition to 5, a screw locking portion (not shown) is formed on the head 4 so that the head side mounting portion 3 of the washer fitting 2 can be locked on the screw locking portion. You can also. The shape and the formation position of the screw locking portion can be designed in any shape where the head side mounting portion 3 of the washer mounting member 2 can be locked.

(Embodiment 8 of screw with washer )
As shown in FIG. 12, the screw 1 in the present invention has a washer locking portion 9 on the outer peripheral portion of the back surface of the head 1, and a protrusion 27 that protrudes further toward the bottom side (downward in FIG. 12) than the center portion 28 on the inner side. And the head projection 14 may be formed on the projection 27.

(Embodiment 9 of screw with washer )
The screw 1 in the present invention may be a bolt as shown in FIG. The diameter, length, thread pitch, and the like of the screw rod 13 can be set to desired dimensions.

( Example of washer in screw with washer)
As an example of the embodiment of the washer according to the present invention, the one shown in FIGS. 8A to 8D is formed with angled washer projections 15 radially from the center hole P toward the outer peripheral edge R at four locations on the washer surface. Several four washer protrusions 15 are continuously formed in the circumferential direction. The washer protrusion 15 can also be formed on the entire circumference of the surface of the washer substrate. As shown in FIG. 1, the washer protrusion 15 has a pitch and a peak height (groove depth) that can engage with the head protrusion 14 formed on the back surface of the head of the screw 1. As shown in FIGS. 11B and 11C, the individual washer protrusions 15 are tightened with a gentle inclination on the rear side in the tightening direction (the right side of FIG. 11B) opposite to the inclination angle of the head protrusion 14. An inclined surface 15b is formed, and has a mountain shape with an abrupt and loosening-preventing inclined surface 15a on the opposite side in the tightening direction (left side of FIG. 11B). The shape of the washer protrusion 15 is not limited to that shown in FIGS. 10B and 10C, and the inclination angle can be selected according to the inclination of the head protrusion 14 (FIG. 10A).

  As shown in FIGS. 10A to 10D, a biting protrusion 16 and a recess 17 are formed on the back surface of the washer 8. The biting protrusion 16 has a sharp triangular pyramid shape as shown in FIG. 10 (b) or a sharp inverted pyramid shape as shown in FIG. 10 (c), and is incorporated in the screw 1 as shown in FIG. When the washer 8 is tightened with the screws 1, it is shaped so as to be able to bite into the body 20 (FIG. 9). The biting protrusions 16 are preferably hardened to increase the hardness so that the biting protrusions 16 can easily bite into the metallic object 20. The inclination angle of the biting protrusion 16 can be set to an arbitrary angle as long as it is easy to bite and is not easily removed. Although the biting protrusions 16 in FIG. 10A are formed at three locations in the circumferential direction of the back surface of the washer 8, the number, formation position, interval, etc. may be other than that. The biting protrusion 16 in FIG. 10B gradually protrudes outward from the top to the bottom, and the lower end (tip) protrudes outward from the outer peripheral edge R of the washer body. 8 (a) to 8 (c) are formed on a portion of the back surface of the washer 8 where the angled washer projections 15 are not formed on the front surface of the washer 8. It can also be formed on the back surface of the portion where 15 is formed.

  As shown in FIGS. 8, 10 (c), and 10 (d), a groove-like recess 17 is formed around the root of the biting protrusion 16. The shape of the recess 17 is not limited to that shown in the figure, but may be any other shape such as a circular ring shape, a hexagonal ring shape, or an octagonal ring shape. As shown in FIG. 9, the concave portion 17 has a protruding portion 21 (FIG. 11C) that is generated by biting the biting protrusion 16 into the tightened body 20, and even if the screws 1 are strongly tightened, the protruding portion 21. This is to prevent the biting protrusion 16 from biting into the clamped body 20 to its root and securely biting into the clamped body 20. The concave portion 17 may not be formed as shown in FIG.

Washer of the present invention may be as shown in Figure 13. In this, a ring-shaped outer groove 26 is formed on the bottom surface of the washer, and biting protrusions 16 are projected at four circumferential positions in the outer groove 26, and a recess 17 is formed on the outer periphery of each biting protrusion 16. is there. Both the outer groove 26 and the recess 17 are recessed by one step from the bottom surface of the washer, and the leading end of the biting projection 16 protrudes to the end of the washer bottom surface (downward in FIG. 13).

(Usage example 1 of screws with washers)
In order to connect two thick plate-like tightened bodies 20 as shown in FIG. 9 using the screw 1 with a washer of the present invention, a screw rod 13 of a screw with a washer (bolt) is connected to the tightened body 20. Then, the screw 1 with a washer 1 or the screw 1 with a washer 8 set inside the peripheral wall 7 of the washer fitting 2 (nut) is screwed into the lower part of the screw rod 13 protruding from the clamped body 20, and the nut The two clamped bodies 20 are tightened and connected by rotating the bolt, the bolt, or both. In this case, tightening proceeds while the washer protrusion 15 of the washer 8 and the head protrusion 14 on the back of the head of the screw 1 are engaged, and the biting protrusion 16 of the washer 8 bites into the body to be tightened 20. At this time, even if the surface of the clamped body 20 rises and protrudes due to the biting of the biting protrusion 16, the protruding portion 21 (FIG. 11C) enters the recess 17 around the root of the biting protrusion 16. Bite into the body 20 to be tightened to the base, the back surface of the washer 8 is brought into close contact with the surface of the body 20 to be tightened, and the two bodies 20 to be tightened are securely fixed. In this case, the washer projection 15 of the washer 8 and the head projection 14 of the bolt are securely engaged with each other by tightening, preventing reverse rotation of the washer 8 and preventing loosening of tightening.

  Screws with washers of the present invention are not limited to bolts and nuts, but are used for various types of shoes, such as golf shoes, shoes for athletics spikes, soccer shoes, etc., civil engineering, architecture, machinery, electric towers, elevator It can be used in all fields that require screws such as agricultural machinery, fishing machinery, railway vehicles, and automobiles.

DESCRIPTION OF SYMBOLS 1 Screws 2 Washer attachment 3 Head side attachment part 4 Head 5 (Screw head part) inclined surface 6 Bottom side attachment part 7 Peripheral wall 8 Washer 9 Washer locking part 10 Lower end opening part 11 Notch 12 Bottom part 13 Screw rod 14 Head projection 14a (for head projection) Tightening slope 14b (for head projection) Locking ramp 15 Washer projection 15a Locking ramp 15b (for washer projection) Tightening ramp (for washer projection) 16 Intrusion protrusion 17 Concave part 20 Clamped body 21 Projection part (swelled part of meat of clamped body)
25 Clearance (between head protrusion and washer protrusion) 26 Outer groove 27 Projection 28 Center
30 head opening P center hole R (washer) outer periphery

Claims (8)

In the screw with washer in which the washer (8) is arranged on the back side of the head (4) of the screw (1) and the washer (8) is attached to the screw (1) by the washer fitting (2),
The screw (1) has a head projection (14) formed on the back surface of the head (4),
In the washer (8), a washer protrusion (15) that can mesh with the head protrusion (14) is formed on a surface facing the head protrusion (14).
The washer fitting (2) includes a head side attachment portion (3), a head opening portion (30), a cylindrical wall or a circumferential wall (7) divided into two or more in the circumferential direction, and a hem side attachment portion. (6) and a lower end opening (10) that can be put on the screw (1), and the washer fitting (2) covers the head (4) of the screw (1) The front end of the head (4) of the screw (1) when the mounting portion (3) is locked to the screw locking portion formed on the inclined surface (5) or the head (4) of the screw (1). The side protrudes from the head opening (30), the peripheral wall (7) covers the outer periphery of the washer (8), and the hem side attachment portion (6) is locked to the washer locking portion (9) of the washer (8) The washer (8) is locked to the screws (1) by the washer fitting (2), and a gap (25) is formed between the head protrusion (14) and the washer protrusion (15). The washer (8) is slidable in the gap (25), and the head protrusion (14) and the washer protrusion (15) are engaged with each other by screwing the screws (1). With screws. The screw with a washer according to claim 1, wherein a biting protrusion (16) projecting forward from the back surface is provided on the back surface of the washer (8). The screw with a washer according to claim 1 or 2, wherein the washer locking portion (9) of the washer (8) is formed to be recessed by one step from the outer peripheral surface of the washer (8). A screw with a washer, characterized in that the hem-side attachment portion (6) is formed so as to protrude to the inside of the peripheral wall (7) so that it can be locked to the washer locking portion (9). The screw with a washer according to claim 1 or 2, wherein a washer locking portion (9) of the washer (8) is formed on a back surface of the washer (8), and a skirt side attaching portion ( A screw with a washer formed by bending the lower end of the peripheral wall (7) inward so that 6) can be locked to the washer locking portion (9). In the washer attachment (2) for attaching the washer (8) to the back side of the head (4) of the screw (1), the washer attachment (2) covers the head (4) of the screw (1). The head side attachment portion (3) that can be locked to the screw locking portion formed on the inclined surface (5) or the head (4) of the lever and the tip side of the head (4) can protrude. The head opening (30) opened at the top of the head side attachment portion (3) and the cylindrical surface covering the outside of the washer (8) from the inclined surface (5) or divided into two or more in the circumferential direction A peripheral wall (7), a skirt side attachment portion (6) that can be locked to the washer (8), and a lower end opening (10) that can be put on the screws (1), the head of the screws (1) When it is put on the part (4), the head side attaching part (3) is locked to the inclined surface (5) of the screw (1) or the screw locking part formed on the head (4). The distal end side of (4) protrudes from the head opening (30), the peripheral wall (7) covers the outer periphery of the washer (8), and the hem side attachment portion (6) is the washer locking portion (9) of the washer (8). ), A gap (25) in which the washer (8) can slide is formed between the screw (1) and the washer (8), and the washer (8) is attached to the screw (1). A washer fitting characterized by In the washer fitting according to claim 5, cuts (11) are provided in the longitudinal direction at several circumferential positions of the cylindrical peripheral wall (7), and the cuts (11) are opened at the lower end of the peripheral wall (7). A washer mounting tool characterized in that the peripheral wall (7) has a restoring force in the direction of diameter expansion and contraction. The washer attachment tool according to claim 5 or 6, wherein the skirt side attachment portion (6) of the peripheral wall (7) is formed on the washer locking portion (9) formed to be depressed by one step from the outer peripheral surface of the washer (8). A washer fitting, characterized in that it is formed so as to protrude inside the peripheral wall (7) so that it can be locked. The washer attachment tool according to claim 5 or 6, wherein the hem side attachment portion (6) of the peripheral wall (7) can be engaged with a washer engagement portion (9) formed on the bottom surface of the washer (8). And a washer fitting formed by bending the lower end of the peripheral wall (7) inward.

Images