JPH04244616A - Device for preventing bolt from rotating together - Google Patents

Abstract

PURPOSE:To surely prevent a bolt or the like from rotating together by providing a movable washer having a protrusive part to be inserted in a gap between the circular hole of a fastened member and a bolt barrel at one inner peripheral spot and a fixed washer having protrusive parts at two spots on its inner periphery. CONSTITUTION:A movable washer 1, which has a part 8 engaging with the squar head of a bolt 3 or a nut 4 on its outer periphery and a protrusive part A to be inserted in a gap between the circular hole 7 of fastened members 5, 6 and the barrel 9 of the bolt 3 at its one inner peripheral spot, is formed. In addition to that, a fixed washer 2 having protrusive parts B, C to be inserted in a gap between the circular hole 7 of the fastened members 5, 6 and the barrel 9 of the bolt 3 at its two inner peripheral spots is formed. The protrusive part A of the movable washer 1 is positioned between the protrusive parts B, C of the fixed washer 2, and they are combined and then used. When the nut 4 is fastened, the protrusive part A of the movable washer 1 functions in such a way as a wedge is driven into a crescent gap to fix the bolt 3 in the circular hole 7.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing bolts from rotating together.

0002

[Prior Art] Conventionally, there is a bolt that prevents co-rotation by forming a non-circular hole in a fastened member and providing an engaging portion in the body of the bolt that engages with a corner of the non-circular hole. .

0003

[Problems to be solved by the invention] In the method of forming a non-circular hole in a member to be fastened, it is not easy to form the hole, and there are few cases where press punching can be employed. Generally, most holes for inserting bolts are made with a drill. However, since the hole that can be drilled with a drill is circular, even if the engaging portion is formed in the body of the bolt, the engaging portion is not engaged, and therefore, the bolts cannot be prevented from rotating together. Therefore, in the past, it was necessary to tighten the bolt by turning the nut while fixing the head of the bolt with a spanner. This work cannot be performed at unstable construction sites or in places where only one hand can be used.
It was extremely dangerous and difficult.

The present invention has been proposed in view of the above-mentioned problems of the prior art, and its object is to provide common bolts that can be used in circular holes and can reliably prevent common rotation. The present invention aims to provide a rotation prevention device.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the invention of claim 1 has an engaging portion for a bolt or a nut, and a circular hole of a member to be fastened and a bolt body at one location on the inner periphery. It consists of a movable washer that has a convex part that is inserted into the gap between the bolt body and the fixed washer that has convex parts that are inserted into the gap between the circular hole of the member to be fastened and the bolt body at two locations on the inner periphery. ,
The convex portion of the movable washer is positioned between the convex portions of the fixed washer for use in combination.

[0006] The invention of claim 2 has a bolt or nut engagement portion on the upper surface, and a convex portion inserted into the gap between the circular hole of the member to be fastened and the bolt body at one location on the inner periphery. and a fixed washer that has a convex portion inserted into the gap between the circular hole in the fastened member and the bolt body at one location on the inner periphery, and the convex portion of the movable washer and the convex portion of the fixed washer This is used in combination with the parts spaced apart in the axial direction.

[0007] The invention according to claim 3 provides a bolt having a protrusion formed in a part of the body to be inserted into the gap between the circular hole of the member to be fastened and the bolt body, and an engaging part for the nut. 1 on the inner circumference
It consists of a movable washer that has a convex part inserted into the gap between the circular hole of the member to be fastened and the bolt body, and is used in combination with the bolt convex part and the convex part of the movable washer spaced apart in the axial direction. It is.

[0008] The invention according to claim 4 is a method for clamping and fastening a bolt head and a nut from both sides by inserting the bolt into a circular hole drilled in a member to be fastened. A part of the movable washer having a joint part is inserted into the gap between the circular hole of the member to be fastened and the bolt body, and is larger than the difference between the radius of the circular hole and the radius of the bolt body, and is 2 of the difference. A convex portion with a height smaller than twice the height is formed at one location on the inner circumference of the fixing washer used in combination with the bolt, etc., and is inserted into the gap between the circular hole of the fastened member and the bolt body. is formed at a position where it can engage with the convex portion of the bolt etc. during tightening.

[0009]

[Operation] According to the invention of claim 1, when the bolt or nut starts to be turned clockwise, the movable washer rotates clockwise relative to the fixed washer, so as shown in FIG.
The convex part (A) of the movable washer moves away from the left convex part (B) of the fixed washer, and as shown in FIG. This (A
) and (B) make contact at three points, one point (D) on the outer periphery of the bolt, and the convex part (A) of the movable washer acts like driving a wedge into the crescent-shaped gap, so that the bolt becomes circular. fixed in the hole. Therefore, even if large frictional resistance acts on the threaded portions of the bolt and nut, the bolt does not rotate, and co-rotation is prevented.

When the bolt or nut starts to be turned counterclockwise, the convex part (A) of the movable washer moves away from the right convex part (C) of the fixed washer, as shown in FIG. Within, the above points (A) and (C) and a point (D') on the bolt outer circumference between these (A) and (C).
They make contact at three points and do not rotate any further, preventing co-rotation. In this way, the co-rotation prevention effect according to the present invention is achieved by the above-mentioned (
A) point and (B) or (C) point and these (A)
Because one point on the outer circumference of the bolt between This will prevent the bolt from tilting.

The invention of claim 2 has convex portions (A) and (E) formed at one location on the inner periphery of the movable washer and the fixed washer, respectively, and has substantially the same function as the invention of claim 1. Therefore, the explanation will be omitted.

[0012] The invention of claim 3 omits the fixing washer of claim 2 and forms one convex portion (E) directly on the bolt, and has substantially the same effect as the invention of claim 1. Therefore, its explanation will be omitted.

According to the invention of claim 4, FIGS. 15 to 17
As shown in the figure, because the bolt (3) is eccentric to one side of the circular hole (7) due to the convex portion (F), the bolt (3) rotates in the tightening direction due to co-rotation during tightening. When a force is applied to force the protrusion, a part of the protrusion (F) hits and presses the protrusion (E) of the fixing washer (2), and the protrusion (F) or the protrusion (E) Either one of them will hit the inner wall of the circular hole (7) or the body of the bolt (3) and the bolt will not turn. More force is added to the bolt (3)
For example, when trying to turn the convex part (F), the circular hole (7)
The center point (Y) of the bolt is (Y'
), and the contact point (P) of the convex part (F) with the inner wall is (P'
), the contact point (Q) between the bolt (3) and the inner wall moves while sliding in (Q'). In this way, the center point (Y) of the bolt (3) rotates around the center point (X) of the circular hole while rotating. Therefore, the head bearing surface (G
) moves laterally and slides over an area larger than the seating surface of the bolt (3), and the frictional resistance also increases compared to when the center point (X) does not move.

[0014] Also, if the nut is tightened strongly, the seat surface (
The frictional resistance of G) also increases accordingly, and due to this seat surface (G) becoming difficult to move, the convex part (F) and circular hole (7)
The frictional resistance also increases. Therefore, no matter how strongly the nut is tightened, co-rotation will not occur.

As mentioned above, the frictional resistance on the side that prevents co-rotation is due to the frictional resistance at points P and Q in addition to the seat surface (G) where the sliding area has increased, so when using a conventional bolt, will increase significantly. On the other hand, since the frictional resistance at the threaded portion (H) is the same as that of a conventional bolt, the frictional resistance on the side that prevents co-rotation is always relatively larger, and co-rotation can be prevented.

Regarding the action during slow rotation, claim 1
Since this invention is substantially the same as the invention of , the explanation thereof will be omitted.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the apparatus of the present invention will be described below with reference to FIGS. 1 to 3. 1 to 3 show a first embodiment of the present invention, in which (1) is a movable washer, (2) is a fixed washer, (3) is a bolt, (4) is a nut, (5) and (6). ) indicates the members to be fastened, and (7) indicates the circular holes of the members (5) and (6) to be fastened.

As shown in FIG. 2, the movable washer (1) has an engaging portion (8) on the outer periphery for engaging the square head of the bolt (3) or nut (4), and has an engaging portion (8) on the outer periphery at one location on the inner periphery. Part to be fastened (5)
It has a protrusion (A) that is inserted into the gap between the circular hole (7) of (6) and the body (9) of the bolt (3). Since the convex portion (A) is formed only at one location on the movable washer (1), it is thicker, has higher rigidity, and is more resistant to torsion than when it is formed at two locations.

As shown in FIG. 3, the fixing washer (2) has two circular holes (7) on the inner circumference of the fastened members (5) and (6).
) and the body (9) of the bolt (3).

Both washers (1) and (2) are used in a relatively rotatable state stacked on top of each other, as shown in FIG. (2) is placed between the convex portions (B) and (C) and combined. In addition, both convex portions (B) (C) of the fixed washer (2)
) may be within a central angle of 180°, but it is best to set it to 120°. Furthermore, the sum of the height of one of the two convex portions (B) and (C) of the fixed washer (2) and the height of the convex portion (A) of the movable washer (1) is the sum of the height of the convex portion (A) of the fastened member (5) and (6). The height of each convex part (A), (B), and (C) is set to be larger than the gap between the circular hole (7) of This is what you set.

Next, the operation of the first embodiment of the present invention will be explained with reference to FIGS.
This will be explained with reference to FIG. First, attach the bolt (3) to the movable washer (
1) and the protrusions (A) (B) (C) of the fixed washer (2)
) can be inserted into the circular holes (7) of the fastened members (5) and (6) when they are in the state shown in FIG. In this state, when the nut (4) is rotated clockwise and the bolt (3) starts rotating together, the movable washer (
1) rotates clockwise relative to the fixed washer (2), the convex part (A) of the movable washer (1) moves away from the left convex part (B) of the fixed washer (2), and as shown in FIG. As shown, within the circular hole (7) of the fastened members (5) and (6), the bolt (3) is inserted between the points (A) and (B) and these points (A) and (B). Contact at three points, one point (D) on the outer periphery of
The convex part (A) of the movable washer (1) acts like driving a wedge into the crescent-shaped gap, and the bolt (3) is inserted into the circular hole (
7) and will not rotate clockwise any further, preventing co-rotation. At this time, the right convex portion (C) of the fixing washer (2) is not in contact with the outer peripheral surface of the bolt (3).

When the bolt (3) begins to be turned counterclockwise, the protrusion (A) of the movable washer (1) touches the fixed washer (2).
) in the circular holes (7) of the fastened members (5) and (6) as shown in FIG.
The points (A) and (C) contact each other at three points, one point (D') on the outer periphery of the bolt (3) between these (A) and (C), and the convex part (
A) acts like driving a wedge into the crescent-shaped gap, and the bolt (3) no longer rotates counterclockwise.
This prevents co-rotation.

[0023] Due to the above phenomenon, it is possible to prevent the bolts (3) or nuts (4) from rotating together when tightening or removing them.

7 to 9 show modified examples of the engaging portion (8) of the movable washer (1), and in FIG. 2, the bolt (3)
Alternatively, a completely hexagonal peripheral wall that fits the square head of the nut (4) is shown, but Fig. 7 shows a case where a movable washer (
Make cuts (10a) at three locations on the outer circumference of 1), and
10a) shows a case in which the space is made to stand up to form an engaging portion (8). In addition, FIGS. 8 and 9 show the movable washer (1)
A tangential cut (10b) is made at one location within the plate width facing the convex portion (A) through the center point (O) of the plate, and
A case is shown in which the engaging portion (8) is formed by protruding semispherically from the position of the cut (10b) toward the upper surface side in the opposite direction to the protruding direction of the convex portion (A). In this way, the movable washer (
1) Convex portion (A) at a position facing each other through the center point (O)
For example, if this movable washer (1) is placed on the head side of the bolt (3), the bolt head will face the engaging part (8) in opposite directions. ) in the direction of the arrow in FIG.
), and the convex portion (A) reliably exhibits a wedge effect.

FIG. 10 shows a second embodiment, in which a fastened member (5) (6
) is formed with a protrusion (E) that is inserted into the gap between the circular hole (7) of the bolt (3) and the body (9) of the bolt (3).
3) is used in combination by placing the fixed washer (2) on the head side and the movable washer (1) on the nut side. In addition, the convex part (A) of the movable washer (1) and the convex part (A) of the fixed washer (2)
The sum of the heights of E) is the sum of the heights of the circular holes (5) and (6) of the fastened members (5) and (6).
7) and the body portion (9) of the bolt (3), and the height of each convex portion (A) (E) is set to be smaller than the gap.

[0026] The bolt (3) is attached to the protrusions (A) and (E) of the movable washer (1) and the fixed washer (2).
When it is in the state shown in FIG. 11, it can be inserted into the circular hole (7) of the fastened members (5) and (6). When the nut (4) is rotated clockwise in this state, the movable washer (1) rotates clockwise relative to the fixed washer (2) due to the presence of the engaging portion (8), so the movable washer ( The convex part (A) of 1) moves away from the convex part (E) of the fixed washer (2) in the circumferential direction, and as shown in FIG.
In the circular hole (7) of 6), three points: the above points (A) and (E), and one point (D") on the outer periphery of the bolt (3) between these (A) and (E). It will not rotate clockwise any further, preventing co-rotation.

When you start turning the bolt (3) or nut (4) counterclockwise, the convex part (
After A) passes the convex part (E) of the fixed washer (2), it moves away from the convex part (E) and enters the circular hole (7) of the fastened members (5) and (6), as shown in Fig. 13. At point (A) and point (E), and the bolt between these (A) and (E) (
They make contact at three points, one point (D''') on the outer periphery of 3), and do not rotate counterclockwise any further but rotate together.

FIG. 14 shows a third embodiment, in which the protrusion (E) of the fixed washer (2) is connected to the body (3) of the bolt (3).
9), omitting the fixed washer (2), and is used in combination with the movable washer (1) shown in FIG. In this case, the protrusion (E) of the bolt (3)
The conditions for forming the convex portion (A) of the movable washer (1) are as follows.
It is the same as the embodiment of , and the convex part (E
), as shown by the one-dot chain line or the two-dot chain line in FIG. In addition, they are formed at predetermined portions of the body (9) at axially spaced positions and placed in the circular hole (7) of the member to be tightened (5) or (6). Note that the operation to prevent the bolts and the like from rotating together is the same as in the second embodiment, and the explanation thereof will be omitted.

15 to 17 show a fourth embodiment of the present invention, in which a protrusion (F) is fixed to the body (9) of the bolt (3) and a protrusion (E) of the washer (2) is fixed to the body (9) of the bolt (3). It is formed so that it can come into contact with a part of it. The height (h) of the convex portion (F) is greater than the difference between the radius (r1) of the circular hole (7) and the radius (r2) of the body (9) of the bolt (3), and 2 of the difference It can be arbitrarily selected within a range smaller than double. That is, (
r1-r2)<h<2(r1-r2), the reason is (
r1-r2), the center of the bolt (Y) is the center point (X) of the circular hole (7).
), the convex portion (F) will rotate without contacting the inner wall of the circular hole (7), and co-rotation cannot be prevented. Further, if a convex portion with a height of 2 (r1-r2) or more is provided, it cannot be inserted into the circular hole (7).

Then, in the state shown in FIG. 15, the bolt (3
) into the circular holes (7) of the fastened members (5) and (6), and then rotate the nut (4) clockwise, the bolts (3) begin to rotate together and the convexity of the bolt (3) A part of the part (F) hits the convex part (E) of the fixed washer (2), and the fixed washer (2) rotates together with the bolt (3). after that,
Since the bolt (3) is eccentric to one side of the circular hole (7), the rotation of the bolt (3) causes either the convex portion (F) or the convex portion (E) to become attached to the member to be fastened (5). )(6
) will hit the inner wall of the circular hole (7) or the body of the bolt (3) and will not turn. If you try to turn the bolt (3) by applying more force, for example, as shown in Figure 16, the protrusion (
When the bolt (F) is in contact with the inner wall of the circular hole (7), the bolt (3)
) moves to (Y'), the contact point (P) between the convex part (F) and the inner wall of the circular hole (7) moves to (P'), and the contact point (P) between the bolt (3) and the inner wall The contact point (Q) with the bolt (3) moves while sliding to (Q'), and the center point (Y) of the bolt (3) is connected to the circular hole (
7) rotates around the center point (X), and (P
) and (Q) points increase. In addition, since the center point (Y) of the bolt (3) moves laterally on the head bearing surface of the bolt (3), the bearing surface (G) of the bolt (3)
slides over an area larger than the seating surface of the bolt (3), increasing frictional resistance. In this way, the bolt (3) and the member to be fastened (5)
(6) The frictional resistance to prevent co-rotation between the threaded part (H)
If the frictional resistance increases, the bolt (3) will no longer rotate clockwise and will be prevented from rotating together.

When the nut (4) begins to be turned counterclockwise, the frictional resistance at the threaded portion (H) prevents the bolt (3) and the members to be tightened (5) and (6) from rotating together. This becomes greater than the frictional resistance, and the bolt (3) begins to rotate together. When the bolt (3) further rotates counterclockwise, co-rotation is prevented in the same manner as shown in FIG. 12 in the second embodiment.

FIGS. 18 and 19 show the fixing washer (2)
This shows still another modification example, in which elastic pieces (11) (11) are extended and formed in symmetrical parts on both sides, and the elastic pieces (11)
) (11) is slightly bent toward the protruding direction of the convex portion (E), so that the elastic pieces (11) and (11) are covered when tightening the bolt (3) or nut (4). Fastening member (5) (
6) and using its frictional force, the fixed washer (2
) to prevent them from rotating together. In other words, the rotational torque is determined by the rotational radius up to the contact point on the outer periphery and the magnitude of the acting force in the tangential direction, so by making the outer diameter of the fixed washer (2) larger than the bolt (3), the rotational radius difference can be reduced. A rotational torque difference corresponding to the rotational torque difference occurs, which causes the rotating washer (2) to stop rotating.

[0033] Convex portions (B) (C) of the fixing washer (2)
)(E) may have a shape as shown in FIG. That is, a thick wall portion ( 12) and a convex portion (B)
(C) A recess is formed in the base end (13) of (E), and a convex part (B) (C) (E) of the fixing washer (2) is formed in the circular hole (7).
), the base end (13) of the protrusion (B) (C) (E)
is designed so that it does not come into contact with the corner (5a) of the inner wall of the circular hole (7), and the base end (
13) and the corner (5a) of the inner wall of the circular hole (7), the convex portions (B), (C), and (E) are connected to the circular hole (
The fixing washer (2) protrudes from the fastened member (
5) Preventing people from leaving the company.

[0034]

According to the invention of claim 1, the bolt or nut and the movable washer can be rotated together due to the presence of the engaging portion, and as a result, when the bolt or nut is rotated, the movable washer The convex portion of the fixing washer, one of the convex portions of the fixing washer, and a part of the bolt contact the inside of the circular hole of the tightened member at three points, reliably preventing co-rotation, and also aligning the axis of the bolt. can be maintained parallel to the axis of the circular hole of the member to be fastened. In addition, commercially available bolts can be used, a simple circular hole may be formed in the member to be fastened, and the cost is low.

According to the second aspect of the invention, since it is only necessary to form one convex portion on each of the movable washer and the fixed washer, manufacturing is easy and the cost is low.
It can be formed thicker than in the case where it is formed individually, and the rigidity can be improved. Furthermore, the wedge action of the convex portion can reliably prevent the bolts from rotating together, and as in the first aspect of the invention, the strength of the movable washer can be improved.

According to the third aspect of the invention, since the movable washer can be eliminated, the number of parts can be reduced, the bolt tightening work can be performed simply and easily, and the bolts can rotate together. can be reliably prevented.

According to the fourth aspect of the invention, the bolt is eccentrically inserted into the circular hole due to the presence of the convex portion and is rotated, so that the frictional resistance on the bolt seating surface side is reduced during tightening. increases, and co-rotation can be reliably prevented. Furthermore, during slow rotation, co-rotation can be reliably prevented by the wedge action of the convex portion.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a movable washer.

FIG. 3 is a perspective view of a fixing washer.

4-6 are plan views for explaining the co-rotation prevention effect of the first embodiment; FIG.

FIG. 7 is a plan view showing a modification of the movable washer.

FIG. 8 is a plan view showing still another modification of the movable washer.

9 is an explanatory cross-sectional view showing a state in which the movable washer shown in FIG. 8 is fitted into a bolt; FIG.

FIG. 10 is a longitudinal sectional view showing a second embodiment of the invention.

FIGS. 11 to 13 are explanatory plan views for preventing co-rotation in the second embodiment.

FIG. 14 is a longitudinal sectional view showing a third embodiment of the present invention.

FIG. 15 is a schematic plan view showing a fourth embodiment of the present invention.

FIG. 16 is a cross-sectional plan view showing the relationship between the bolt and the circular hole for explaining the principle of preventing co-rotation during tightening in the fourth embodiment.

FIG. 17 is a longitudinal side view of FIG. 16;

FIG. 18 is a plan view showing a modification of the fixed washer.

FIG. 19 is a cross-sectional view taken along line AA in FIG. 18;

FIG. 20 is a longitudinal sectional view showing still another modification of the fixing washer.

Claims (4)

[Claims] [Claim 1] It has an engaging part for a bolt or a nut,
A movable washer having a convex portion inserted into the gap between the circular hole of the member to be fastened and the bolt body at one location on the inner periphery, and a movable washer having a convex portion inserted into the gap between the circular hole of the member to be fastened and the bolt body at two locations on the inner periphery. A co-rotation prevention device for bolts, comprising a fixed washer having a convex portion inserted into a gap, and used in combination with the convex portion of the movable washer positioned between the convex portions of the fixed washer. [Claim 2] It has an engaging part for a bolt or a nut,
A movable washer having a convex portion inserted into the gap between the circular hole of the member to be fastened and the bolt body at one location on the inner periphery; A co-rotation prevention device for bolts, comprising a fixed washer having a convex portion inserted into a gap, and characterized in that the convex portion of the movable washer and the convex portion of the fixed washer are used in combination with the convex portion separated in the axial direction. . 3. A bolt having a convex portion formed in a part of the body to be inserted into the gap between the circular hole of the member to be fastened and the bolt body, and a bolt having an engagement portion for the nut, and a bolt having an inner periphery. It consists of a movable washer that has a convex part inserted into the gap between the circular hole of the fastened member and the bolt body, and is used in combination with the convex part of the bolt and the convex part of the movable washer separated in the axial direction. A device for preventing co-rotation of bolts. [Claim 4] A movable bolt having a body of the bolt or an engaging part for the bolt, in a device that is inserted into a circular hole drilled in a member to be fastened and the member to be fastened is clamped and fastened by a bolt head and a nut from both sides. A portion of the washer is inserted into the gap between the circular hole of the member to be fastened and the bolt body, and has a height greater than the difference between the radius of the circular hole and the radius of the bolt body, and less than twice the difference. A protrusion is inserted into the gap between the circular hole of the member to be fastened and the bolt body at one place on the inner circumference of the fixing washer used in combination with the bolt, etc.
A co-rotation prevention device for bolts, characterized in that it is formed at a position where it can engage with a convex portion of the bolt, etc. during tightening.