JPWO2015118670A1 - Washers, washers with nuts, washers with bolts - Google Patents

Abstract

Biting protrusions are provided at several positions in the circumferential direction of the back surface of the washer. The biting protrusions are tapered so as to be able to bite into the object by tightening screws such as nuts and bolts, and the tip part has an arcuate or flat shape. The biting protrusion has a conical shape, and the tip thereof has an arc surface shape or a planar shape. The biting protrusions are pyramidal, and the outer peripheral surface corners (ridges) of the biting protrusions are arcuate or planar. The biting protrusion has a cross-sectional shape of a semiconical shape or a crescent shape, and the tip thereof has an arc surface shape or a planar shape. The flat surface of the semi-conical bite protrusion and the curved surface of the crescent cone bite protrusion protrude beyond the center of the washer in the tightening rotation direction. The back of the washer has a dent that is one step lower than the back of the washer at the root peripheral edge of the dent, so that the dent can be filled with meat that rises from the object by the dig into the object. I made it.

Description

  The present invention relates to a washer, which is a washer, a washer with a nut, and a washer with a bolt, which is difficult to loosen when engaged with a screw when tightened with screws, and which is difficult to loosen when biting into a connecting material (clamping material) such as a metal plate or wood.

  Conventionally, there are various types of washers that prevent the screws from loosening after the screws are tightened. There is patent document 1 as an example. 5 (a) and 5 (b) of Patent Document 1, a bolt having a head protrusion on the back surface of the bolt head, and FIG. 6 has a nut having a head protrusion on the back surface of the nut head. FIG. 3 discloses a washer having a protrusion (washer protrusion) that meshes with the head protrusion on the surface of the washer. When the bolt or nut is tightened, the head protrusion engages with the washer protrusion so that the bolt or nut can be prevented from loosening. Further, in FIGS. 1A to 1C of the same document 1, a biting protrusion is provided on the back surface of the washer, and a concave portion is provided on the back surface and the root of the biting protrusion so that the biting protrusion bites into the connecting material. A washer is disclosed in which a protruding connecting member meat (projecting meat) enters and the washer is difficult to reversely rotate (loosely rotate).

Japanese Patent No. 3474341

  Each of the head projections and washer projections of the screws disclosed in Patent Document 1 (sometimes collectively referred to as “projections”) is a chevron with a sharp tip (ridge line portion) (end-face shape triangle). Since the head is elongated in the radial direction of the head, such as a washer, nut, or bolt: the same applies hereinafter), there is a difficulty in that the tip is likely to be chipped or crushed (easy to be lost). Defects at the tip are undesirable because they cause loosening of the screws. In addition, since the ridge line portion molding portion of the press mold for molding these screws is sharp, there is a difficulty that the portion is easily lost and is difficult to hold (the number of pressable times is small). Defects in the press die are not preferable because they lead to a decrease in accuracy of the molded product and cause looseness.

  The problem to be solved by the present invention is that the ridge line portion of the projection of the screw is difficult to be lost, the ridge line portion molding portion of the press mold is difficult to be lost, the mold is easy to hold, and the screw has a loosening prevention structure that can be press-molded many times. Is to provide. It is another object of the present invention to provide a washer which is difficult to be damaged at the tip end portion of the biting protrusion, is difficult to be lost at the protrusion molding portion of the press die, has a good mold holding property, and can be press-molded many times.

  The washer of the present invention is a washer having a through-hole at the center, with biting protrusions protruding at several locations in the circumferential direction of the back surface, and the biting protrusions bite into the tightened object by tightening screws such as nuts and bolts. It is tapered as possible, and the tip is arcuate (R-shaped) or planar.

  In the washer of the present invention, the biting protrusion may have a conical shape, and a tip portion thereof may have an arc surface shape or a planar shape.

  In the washer of the present invention, the biting protrusion may have a pyramid shape, and an outer peripheral surface corner portion (ridge line portion) of the biting protrusion may have an arc surface shape or a planar shape.

  In the washer of the present invention, the biting protrusion has a semi-conical shape (including a substantially semicircular shape: the same applies hereinafter), a crescent cone shape (a cross-sectional shape is a crescent moon, and a tip side is tapered: a substantially crescent cone shape) Including the shape: the same applies hereinafter), and the tip may be arcuate or planar. In this case, the flat portion of the semiconical protrusion and the curved portion (curved surface) of the crescent cone-shaped protrusion can be provided so as to protrude further in the tightening rotation direction than the center of the washer.

  The washer is provided with a hollow portion that is the back surface of the bite projection and is recessed by one step from the back surface, and the hollow portion is a meat that rises from the object when the bite protrusion bites into the object. Can enter.

  The washer is formed in a ring shape with a back plateau that is one step higher than the outer inner periphery and outer periphery between the outer inner periphery and outer periphery of the through-hole, and bites into the back plateau. A protrusion may be formed.

  The washer has biting protrusions protruding at several places in the circumferential direction on the back surface, and a large number of washer protrusions are protruding at several places in the circumferential direction on the front surface. There is no protrusion part, and the biting protrusion may be formed on the back side of the protrusion part.

  In the washer of the present invention, in the washer, a large number of washer protrusions are radially outward from the through hole side of the washer, and the back surface circumferential direction of the head of a nut or the head of a bolt (including a hook, a screw, etc.) , And a plurality of angle-shaped head protrusions formed radially, so that the engagement does not loosen after completion of tightening of the nut or bolt (including “not easy to loosen”; the same applies hereinafter). The washer protrusion is a climbing slope, a locking surface, and a chevron with a ridge line portion at the intersection of both sides, the climbing slope is in front of the rotation direction of the nut or bolt than the ridge line part, and the locking surface is a ridge line Nut or bolt tightening rotation direction ahead of the part. The climbing slope has a gentle upward slope in the tightening rotation direction, the locking surface is a steeper slope or a vertical plane than the climbing slope, and the ridge line portion is arcuate or planar.

  The washer is formed in a ring shape between the outer inner periphery and the outer periphery of the through-hole on the surface thereof, and is formed in a ring shape that is one step higher than the outer inner periphery and the outer periphery. A protrusion may be formed.

  The washer with a nut or the washer with a bolt according to the present invention is rotatably set on the back surface of the head of the nut or the back surface of the head of the bolt, and the washer protrusion faces the head protrusion of the nut or bolt so that the nut or bolt is tightened. Thus, the washer protrusion and the head protrusion are engaged with each other.

The washer, the washer with nut, and the washer with bolt of the present invention have the following effects.
(1) Since the leading end of the biting protrusion is arcuate or planar, the leading end is difficult to be lost. Since the biting projection forming part of the press die can be formed in an arc surface shape or a flat shape corresponding to the shape, it is difficult to be lost and lasts long.
(2) When the biting protrusion has a semi-conical or crescent cone shape in cross section, it is particularly difficult to be lost.
(3) When the biting protrusion has a semi-conical or crescent cone shape in cross-section, and the flat surface in the case of a semi-conical shape and the curved surface in the case of a crescent cone protrude beyond the central portion of the washer in the tightening rotation direction. Is easy to bite into the object when the washer is screwed with screws.
(4) When a recess is provided at the base of the biting protrusion on the back surface of the washer, meat that protrudes when the biting protrusion bites into the object (protruding meat) enters, so that the biting protrusion becomes difficult to loosen.
(5) When the biting protrusion is formed on the back surface of the washer surface opposite to the non-protruding portion, the biting protrusion is difficult to be crushed even if the biting protrusion is molded by pressing, so the precision biting protrusion and washer protrusion The biting protrusion can be molded. Press dies are also less likely to lose shape and last longer.
(6) In the case of a washer with a bolt in which the washer is rotatably fitted to the back surface of the head of the bolt, there is no trouble of inserting the bolt into the washer when the washer is used.
(7) In the case of a washer with a nut that is rotatably fitted to the back surface of the nut head, there is no trouble of setting the washer on the back surface of the nut when the washer is used.

1 shows an example of the washer of the present invention, in which (a) is a plan view, (b) is a view from the arrow A of the washer protrusion of (a), (c) is an end view of another example of the washer protrusion, (d) is a front view of the washer of (a), (e) is a cross-sectional view of BB of (a), (f) is a bottom view of the washer, and (g) is a cross-sectional view of CC of (f). FIG. 4 shows another example of the washer of the present invention, in which (a) is a plan view, (b) is a front view of the washer, (c) is a bottom view of the washer, and (d) is a semiconical biting protrusion of the washer. (E) is an explanatory view of a state in which the flat surface of the semiconical biting protrusion is provided facing the outer peripheral surface of the washer, (f) is an explanatory view of a crescent-shaped biting protrusion, and (g) is a quadrangular pyramid. Explanatory drawing of a shape biting protrusion, (h) is CC sectional drawing of (c). (A) is a front view of the washer with a nut of the present invention, (b) is an assembly explanatory view of the washer to the nut, and (c) is a partial sectional view of the washer with a nut of (a). (A) is a front view of the washer with a bolt of the present invention, and (b) is a detailed view of P part of (a). (A)-(c) is assembly explanatory drawing of the washer with a bolt of Fig.4 (a). (A)-(c) is process explanatory drawing in the case of fixing two board | plate materials with the washer with a nut of FIG. 3, and the washer with a bolt of FIG. 4 (a). (A) is a front view of a nut with a head protrusion, (b) is a front view of a bolt with a head protrusion. Use explanatory drawing of the washer with a nut of Fig.7 (a), and the washer with a bolt of FIG.7 (b). 2A is a detailed view of the semi-conical bite protrusion of FIG. 2D, FIG. 2B is a detailed view of the semi-conical bite protrusion of FIG. 2E, and FIG. 2C is a crescent cone of FIG. FIG. 3D is a detailed view of the bite protrusion, FIG. 2D is a detailed view of the quadrangular pyramid protrusion of FIG. 2G, and FIG. (A) is a detailed longitudinal cross-sectional view of the conical bite protrusion, (b) is a detailed vertical cross-sectional view of the semi-conical bite protrusion, and (c) is a detailed cross-sectional view of the quadrangular pyramid bite protrusion.

(Embodiment 1: Washer)
An example of the washer of the present invention is shown in FIG. The washer 1 has an annular shape with a through hole 2 formed in the center. The through hole 2 has a hole diameter through which the connecting shaft 26 (FIG. 3B), the bolt shaft 37 (FIG. 4A) and the like can be inserted.

  Between the surface inner peripheral edge 3 (FIG. 1 (d)) on the surface of the washer 1 and outside the through hole 2, and the surface inner peripheral edge 3 (FIG. 1 (d)). And the surface high platform part 5 one step higher than the surface outer peripheral part 4 is formed in the ring shape.

(Washer protrusion)
A large number of angle-shaped washer protrusions 6 (FIG. 1A) are formed at four locations in the circumferential direction of the surface hill part 5, and a non-projection part 7 without a washer protrusion is formed between the washer protrusions 6. The biting protrusions 8 are provided so as to protrude from four positions on the back surface of the non-protruding part 7.

  The four washer protrusions 6 in FIG. 1 are formed in the circumferential direction of the surface hill portion 5. Each washer protrusion 6 has a mountain shape, and includes a climbing slope 9 (FIG. 1B), a locking surface 10, and a ridge line portion 11. The climbing slope 9 (FIG. 1B) is formed on the front side of the ridge line portion 11 in the tightening rotation direction, the locking surface 10 is formed on the front side of the ridge line portion 11 in the tightening rotation direction. And at the intersection (the top of the mountain) of the locking surface 10. The top of the ridge portion 11 is arcuate (FIG. 1 (b)), so that it is difficult to chip and to be crushed (hard to break) due to engagement with the projections (head projections) of screws such as bolts and nuts. It is. In addition, the ridge line portion molding portion of the press mold for molding the washer 1 is difficult to be lost during molding, and is held (long-lasting). The top of the ridge portion 11 has an arc surface or a flat shape as shown in FIG. 1 (c), and is difficult to be chipped or crushed by engagement with the projections (head projections) of screws such as bolts and nuts. Can also be made difficult).

  The multiple washer protrusions 6 have the same shape. The protruding dimensions of the washer protrusion 6, the inclination angle of the overpass slope 9, the angle of the locking surface 10, the arc surface radius of the ridge line portion 11, the plane width in the case of a flat shape, etc. are appropriately determined according to the size and application of the washer 1. Can be designed. The inclination angle (gradient) of the climbing slope 9 is preferably about 10 to 60 degrees, and the angle of the locking surface 11 is preferably about 70 to 90 degrees.

(Bite protrusion)
The biting protrusion 8 can have various shapes. Some examples are shown in FIGS. The biting projections 8 are projected at four locations in the circumferential direction of the back surface of the washer 1 (FIGS. 2A to 2C). The biting protrusions 8 bite into members 40 or 41 (FIGS. 6A to 6C) that are fastened or connected (hereinafter referred to as “objects”) 40 and 41 when the washer 1 is fastened and rotated. The shape is easy to bite into the objects 40 and 41, for example, a semi-conical shape (FIGS. 2 (d) (e) and 9 (a) (b)), a crescent cone shape (FIG. 2 (f), FIG. 9 (c)), a quadrangular pyramid shape (FIG. 2 (g), FIG. 9 (d)), and a conical shape (FIG. 9 (e)). Regardless of the shape, the base 8c ((FIGS. 9A to 9E)) is thick and the tip 8a is tapered.

  The tip 8a of the biting protrusion 8 is arcuate (FIG. 10 (a)) or flat (FIG. 10 (b)), so that the tip 8a is difficult to break when biting, and the press die is also difficult to break. To. In the case of a quadrangular pyramid shape (FIG. 9 (d)), the outer peripheral surface corner 8b is also arc-shaped (FIG. 10 (c)) or planar, and is difficult to break when biting in, and the press die is also difficult to break. , Make sure to hold.

  The biting protrusion 8 in FIG. 2D has a semi-conical shape as shown in FIG. 9A, and the flat surface portion 8 d protrudes from the center line (XX) of the washer 1. 2 (e) is also semi-conical, but the difference from FIG. 2 (d) is that the flat portion 8d of the biting protrusion 8 faces the outer peripheral surface 5a of the surface hill portion 5 (outer peripheral surface 5a). The same surface). Also in this case, the above-mentioned effect can be obtained by making the tip 8a arcuate or planar.

  The biting protrusion 8 shown in FIG. 2 (f) has a crescent cone shape as shown in FIG. 9 (c). This crescent cone-shaped biting protrusion 8 is also provided with its curved portion (curved surface) 8 e protruding inward from the center line (XX) of the washer 1. The tip 8a of the biting protrusion 8 is flat (FIG. 2 (h), FIG. 10 (b)) or arcuate (FIG. 1 (g), FIG. 10 (a)) so that the above-described effect can be obtained. It is.

  The biting protrusion 8 shown in FIG. 2 (g) has a quadrangular pyramid shape, and the tip 8a has an arcuate shape (FIG. 1 (g), FIG. 10 (a)) or a planar shape (FIG. 2 (h), FIG. b)), and the four outer peripheral corners 8b are also arcuate (FIG. 10 (c)) or planar (octagonal pyramid), and the tip 8a and the outer peripheral corner (ridgeline) 8b are both It is difficult to break when tightening, and the press mold is also difficult to break, so that the mold is held.

  Although the back surface of the washer 1 is flat, if necessary, a back plateau portion that is one step higher than the through hole 2 and the outer peripheral edge of the washer 1 is formed in a ring shape, similar to the washer surface. You can also In this case, the biting protrusions 8 can be provided to protrude at four locations in the circumferential direction of the back plateau.

(Recessed part)
A recess 13 is formed on the back surface of the washer 1 and at the root 8c of the biting protrusion 8 (FIGS. 1D to 1H and FIGS. 9A to 9E). The recess 13 is formed by pressurizing the back surface of the washer 1 with a press die and projecting the biting projection 8 (projected as the biting projection 8 by the amount depressed by pressurization). When there is the recess 13, the biting protrusion 8 can sufficiently bite into the objects 40 and 41 (FIGS. 6A to 6C) to the root 8 c when tightening, and the objects 40 and 41 that rise due to the biting. Meat (swelling meat) enters the hollow portion 13 (bites in), and the washer 1 becomes difficult to reverse (it becomes difficult to loosen). The recess 13 in FIG. 1 (f) is formed in a circle around the root 8c of the biting protrusion 8, but may have other shapes and widths as long as it can be formed by pushing out the biting protrusion 8. .

(Embodiment 2: Washer with nut)
Other examples of the washer of the present invention are shown in FIGS. This figure shows the case of a washer 25 with a nut rotatably incorporated on the back side of the nut 20. This washer 1 is the washer of FIG.

  A head projection 21 is formed on the back surface of the nut 20. The head protrusion 21 has a mountain shape having a climbing slope 22, a locking surface 23, and a ridge line portion 24, and the inclination angle of the climbing slope 22, the locking surface 23, the height of the ridge line portion 24, and the like are the washer protrusions of the washer 1. In the same manner as those of No. 6, the washer protrusions 6 can be engaged with each other. When the nut 20 is turned in the tightening direction, the head projection 21 rotates over the inclined surface 9 over the washer projection 6. However, in the opposite direction, the locking surface 23 of the head projection 21 is locked with the locking surface of the washer projection 6. 10 to prevent rotation. The ridge line portion 24 of the head projection 21 is also arcuate or planar, so that even if the head projection 21 climbs over the washer projection 6, it is difficult to break, and the press mold is also difficult to break during molding.

  3A, when the nut 20 is rotated in the tightening direction, the head protrusion 21 of the nut 20 meshes with the washer protrusion 6 of the washer 1, and the washer 1 is pressed against the object. Can be caused to bite into the objects 40 and 41 (FIGS. 6A to 6C). In this case, the flesh of the objects 40 and 41 that rise due to the biting protrusions 8 enters the indented portion 13 to prevent loose rotation (return rotation).

The washer 25 with a nut shown in FIG. 3A can be manufactured, for example, by the steps shown in FIGS.
(1) The connecting shaft 26 projecting from the back surface of the nut 1 is inserted into the through hole 2 of the washer 1 (FIG. 3B).
(2) In the state of (1), the end portion 27 (FIG. 3 (c)) of the connecting shaft 26 projecting downward from the through hole 2 is caulked outward to attach the washer 1 to the nut 20 (so as not to come off). To do). In this case, the washer 1 is rotatable.

(Embodiment 3: Washer with bolt)
Another example of the washer of the present invention is shown in FIG. This figure shows a washer 36 with a bolt in which the washer 1 is incorporated on the back side of the head 31 of the bolt 30. This washer 1 is the washer of FIG.

  A head protrusion 32 is formed on the back surface of the head 31 of the bolt 30. The head protrusion 32 is a mountain shape having a climbing slope 33, a locking surface 34, and a ridge 35, and the size, inclination angle, etc. of the climbing slope 33, the locking surface 34 are the same as the washer projection 6 of the washer 1. When the bolt 36 with a washer is turned in the tightening direction, the head protrusion 32 rotates over the washer protrusion 6 of the washer 1 and in the opposite direction, the head protrusion 32 is locked. The surface 34 is locked to the locking surface 10 of the washer protrusion 6 to prevent rotation. The top portion of the ridge line portion 35 is also formed in an arc surface or a flat shape so that the head protrusion 32 is not easily lost even when it passes over the washer protrusion 6, and the ridge line portion formation portion of the press die is not easily lost during molding. is there.

The bolted washer 36 shown in FIG. 4A can be manufactured, for example, by the steps shown in FIGS. 5A to 5C.
(1) A bolt shaft (screwless shaft) 37 (FIG. 5B) protruding from the back surface of the head 31 of the bolt 30 is inserted into the through hole 2 of the washer 1 (FIG. 5B).
(2) In the state of (1), the screw 38 (FIG. 5C) is cut on the outer surface of the bolt shaft 37 projecting downward from the washer 1, and the washer 1 is attached (so as not to come off). In this case, the washer 1 is rotatable.

(Example of use)
The washer 25 with a nut shown in FIG. 3A and the washer 36 with a bolt shown in FIG. 4A can be used, for example, as shown in FIGS.
(1) As shown in FIG. 6 (a), the bolt shaft 37 of the bolted washer 36 is inserted as shown in FIG. 6 (b) from above the two stacked plate members (objects) 40, 41.
(2) The washer with nut 25 is screwed onto the bolt shaft 37 projecting downward from the lower plate 40, and the back surface of the washer 1 contacts the lower plate 40 with the washer 25 with nut as shown in FIG. 6C. Until it is tightened, the biting protrusion 8 of the washer 1 bites into the lower plate 40, and the meat raised by the biting enters the recess 13 (FIGS. 1 (f) and (g)) of the root 8c of the biting protrusion 8. The loosening of the washer 1 is prevented and the meshing of the washer projection 6 and the head projection 21 of the washer 25 with a nut is prevented from loosening. Further, the biting protrusion 8 of the washer 1 of the washer 36 with the bolt bites into the upper plate 41, and the meat raised by the biting is the recess 13 of the root 8c of the biting protrusion 8 (FIGS. 9A to 9E). The washer 1 is prevented from loosening and the engagement of the washer projection 6 and the head projection 32 of the bolted washer 36 is not loosened.

  Although the above-mentioned usage example is a case where the washer 25 with a nut is tightened, the bolt can be tightened in the same manner as described above by tightening a washer 36 with a bolt.

(Embodiment 4: Nut)
An example of a nut that can be used as a set with the washer of the present invention is shown in FIG. In this nut 20, the washer 1 is not attached to the nut 20 in FIG. Accordingly, the head protrusion 21 is a mountain shape having a climbing slope 22, a locking surface 23, and a ridge line portion 24, and the size, inclination angle, etc. of the climbing slope 22, the locking surface 23 are determined by a washer 1 (FIG. 1 (a)). This is the same as the washer protrusion 6 and meshes with the washer protrusion 6. The top portion of the ridge line portion 24 is also formed in an arc surface shape or a flat shape so that it is difficult to be lost even if the head protrusion 21 gets over the washer protrusion 6, and the ridge line portion molding portion of the press die is also difficult to be lost during molding. is there.

(Embodiment 5: Bolt)
An example of a bolt that can be used as a set with the washer of the present invention is shown in FIG. The bolt 30 in this figure is one in which the washer 1 of the bolt 30 in FIG. 4A is not attached. Accordingly, the head protrusion 32 is a mountain shape having a climbing slope 33, a locking surface 34, and a ridge line portion 35. The size and inclination angle of the climbing slope 33, the locking surface 34, and the like are the washer 1 (FIG. 1 (a)). This is the same as the washer protrusion 6 and meshes with the washer protrusion 6. The top portion of the ridge line portion 35 is also arc-shaped or planar, so that even if the head protrusion 32 gets over the washer protrusion 6, it is difficult to be lost, and the ridge line portion molding portion of the press mold is also difficult to be lost during molding. is there.

(Usage example of the washer, nut and bolt of the present invention)
The washer 1 of the present invention can be used in combination with the nut 20 in FIG. 7A and the bolt 30 in FIG. 7B as shown in FIG.
(1) After setting the washer 1 of FIG. 1A on the bolt shaft 37 of the bolt 30, the lower plate 40 is inserted from above the two plate members (objects) 40, 41 on which the bolt 30 is overlaid. A bolt shaft 37 protruding downward is covered with the washer 1 of FIG. 1A, and the nut 20 of FIG. 7A is screwed onto the bolt shaft 37 from below.
(2) When the nut 20 is tightened and rotated in the above state, the head protrusion 21 of the nut 20 moves over the washer protrusion 6 of the washer 1 and presses the washer 1 against the lower plate 40, so that the back surface of the washer 1 is The biting protrusion 8 bites into the lower plate 40. In this case, the meat of the lower plate 40 that rises due to the biting protrusion 8 of the washer 1 enters the hollow portion 13 (FIGS. 9A to 9E), and the loose rotation (return rotation) is prevented. After completing the tightening rotation of the nut 20, the locking surface 23 of the head projection 21 is locked to the locking surface 10 of the washer projection 6 and the reverse rotation (return rotation) of the nut 20 is prevented.

  The bolt 30 may be tightened instead of the nut 20. In this case, the nut can be tightened in the same manner as when the nut is tightened, and reverse rotation (return rotation) is prevented.

  In the present invention, the root portion 21a of the head protrusion 21 and the root portion 6a of the washer protrusion 6 (FIGS. 3 (b) and 4 (b)) that are meshed with each other are made arcuate or planar, It is also possible to make it difficult for these root part molding sites to be lost.

DESCRIPTION OF SYMBOLS 1 Washer 2 Through-hole 3 Surface inner periphery (outside of through-hole) 4 Surface outer peripheral part 5 (Washer) surface perimeter 5a Peripheral surface 6 (of surface perimeter) 6 Washer protrusion 6a Root part (of washer protrusion) 7 Protrusion No part 8 Biting protrusion 8a Tip part of biting protrusion 8b Corner of outer peripheral surface 8c (biting protrusion) Root 8d (of biting protrusion) Flat part 8e (of semi-conical biting protrusion) 8e (of crescent cone biting protrusion) Curved part (curved surface)
9 Overpass slope 10 (of the washer) Locking surface 11 (of the washer) Ridge part 13 (of the washer) 13 Indented part 20 Nut 21 Head protrusion 21a (of the nut head) Root part 22 (of the nut head protrusion) ) Overcoming slope 23 (Nut) locking surface 24 (Nut) ridge line 25 Nut 26 with washer 26 (Nut) connecting shaft 27 (Connecting shaft) tip 30 Bolt 31 (Bolt) head 32 (Bolt ) Head projection 33 (Bolt) climbing slope 34 (Bolt) locking surface 35 (Bolt) ridge part 36 Washer bolt 37 Bolt shaft 38 Screw 40 Lower plate (plate material: object)
41 Upper plate (plate material: object)

Claims (13)

In the washer with a through hole in the center,
Biting protrusions are projected at several locations around the washer in the circumferential direction on the back,
The biting protrusion is a taper that can bite into the object by tightening screws such as nuts and bolts,
The tip is arcuate or planar,
A washer characterized by that. The washer according to claim 1,
The biting protrusion is conical, and its tip is arcuate or planar,
A washer characterized by that. The washer according to claim 1,
The biting protrusion is a pyramid shape, and the outer peripheral surface corner (ridge line portion) of the biting protrusion is an arc surface shape or a planar shape,
A washer characterized by that. The washer according to claim 1,
The biting protrusion is a cross-sectional semiconical or crescent cone shape, and its tip is arcuate or planar.
A washer characterized by that. The washer according to claim 4,
The flat part of the semi-conical bite protrusion or the curved surface of the crescent cone bite protrusion protrudes forward in the tightening rotation direction from the center of the washer.
A washer characterized by that. In the washer according to any one of claims 1 to 5,
On the back of the washer and at the base peripheral edge of the biting protrusion, it is provided with a recessed portion that is one step lower than the back of the washer,
The hollow part can contain meat that rises from the object when the biting protrusion bites into the object.
A washer characterized by that. The washer according to any one of claims 1 to 6,
Between the outer inner periphery and the outer periphery of the through hole on the back surface of the washer, a back plateau portion that is one step higher than the outer inner periphery and the outer periphery is formed in a ring shape,
A biting protrusion was formed on the back plateau,
A washer characterized by that. The washer according to any one of claims 1 to 7,
Biting protrusions are projected at several locations in the circumferential direction on the back of the washer,
A large number of washer protrusions are protruded at several circumferential positions on the surface of the washer, and the surface has a protruding part with a washer protrusion and a non-protruding part without a washer protrusion,
The bite protrusion was formed on the back side of the non-projection part,
A washer characterized by that. The washer according to claim 8,
A large number of washer protrusions are radial from the through hole side to the outer peripheral side of the washer, and mesh with the multiple head protrusions formed radially in the circumferential direction of the back surface of the head of the nut or the head of the bolt. Or, after tightening the bolts, the meshing was not loosened.
A washer characterized by that. In the washer according to claim 8 or 9,
The washer protrusion is a mountain shape with a ridgeline portion at the intersection of both the overpass slope, the locking surface, and both sides,
The climbing slope is in front of the ridgeline part before the tightening rotation direction of the nut or bolt,
The locking surface is ahead of the ridgeline part in the tightening rotation direction of the nut or bolt,
The climbing slope is a gentle upward slope in the tightening rotation direction,
The locking surface is a steeper slope or a vertical plane than the climbing slope,
The ridge portion is arcuate or planar,
A washer characterized by that. The washer according to any one of claims 8 to 10,
Between the outer inner peripheral edge and the outer peripheral edge of the through hole on the surface of the washer, a surface ridge that is one step higher than the outer inner peripheral edge and the outer peripheral edge is formed in a ring shape,
A washer protrusion was formed on the surface plateau.
A washer characterized by that. The washer according to any one of claims 1 to 11, wherein the washer is rotatably set on the back surface of the head of the nut, and the washer protrusion faces the protrusion of the head of the nut. The head protrusions meshed,
A washer with a nut. The washer according to any one of claims 1 to 11, wherein the washer is rotatably set on the back surface of the head of the bolt, and the washer protrusion is opposed to the head protrusion of the bolt. The head protrusions meshed,
This is a washer with a bolt.

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