JPH0932835A - Locking of screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lock a screw simple and surely, loosen the screw simply and enable repetitive use. SOLUTION: A groove 11 of an axial direction is arranged on a bolt 10, an engaging projection 21 which is engaged with the groove 11 of the bolt 10 is arranged on a washer 20, and the washer 20 is disrotatably mounted on the bolt 10. Lock parts 22, 31 are arranged on the washer 20 and a nut 30, a lock tool is locked with the lock parts 22, 31, and the nut 30 is disrotated to the washer 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents a screw from loosening when a nut is screwed onto a bolt or when an object to be fastened is fastened to another object to be fastened by the bolt.

[0002]

When the nut is screwed onto the bolt or when the object to be fastened is fastened to another object to be fastened by the bolt, there is a problem that the screw loosens due to vibration or the like. To prevent this, insert a split pin by providing an insertion hole in the nut or the object to be fastened and the bolt,
Nuts that do not loosen once tightened, such as U-nuts and fine nuts, must be used. When the split pin is inserted in the current situation, it is possible to prevent the screw from loosening, but the work is troublesome. If you use a nut that does not loosen once tightened, it cannot be said that the screw will stop loosening securely, and if you want to loosen the screw it will be difficult to work. Can not.

The problem to be solved by the present invention is to easily and surely prevent loosening of a screw, and also to allow the screw to be easily loosened and to be used repeatedly. Is.

[0004]

The means for solving the problems will be described with reference to the reference numerals of FIGS. 1 to 9. In the invention of claim 1, the bolt 10 is provided with an axial groove 11 and the washer 20 is provided. The washer 20 is non-rotatably attached to the bolt 10 by providing the engaging projection 21 that engages with the groove 11 of the bolt 10, and the washer 20 and the nut 30 are provided with the engaging portions 22 and 31, respectively. The present invention of claim 2 is an insertion in which the bolt 10 is inserted, in which the locking member 50 is locked to the stoppers 22 and 31 to prevent the nut 30 from rotating with respect to the washer 20. An engaging portion 42 is provided on an object to be fastened 40 having a hole 41, and the washer 2
The engaged portion 23 that engages with the engaging portion 42 of the object 40 to be fastened
Is provided so that the washer 20 is non-rotatably attached to the object to be fastened 40, and the washer 20 and the head 13 of the bolt 10 or the nut 30 are provided with the engaging portions 22, 12, 31. Two
The locking tool 50 is locked to 2, 12, 31 to prevent the bolt 10 or the nut 30 from rotating with respect to the washer 20.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention is shown in FIGS.
It will be described below based on 0. 1 to 3 show an embodiment of the invention of claim 1, and FIGS. 4 to 7 show an embodiment of the invention of claim 2.

First, an embodiment of claim 1 in FIGS. 1 to 3 will be described. This is to fasten the article to be fastened 40 and another article to be fastened (not shown) below the article to be fastened 40 by the bolt 10 and the nut 30. It is abbreviated and expressed.

As shown in FIG. 1, the bolt 10 which is inserted into the insertion hole 41 of the object to be fastened 40 and protrudes from the surface of the object to be fastened 40 is provided with an axial groove 11, and the washer 20 is bolted. An engaging projection 21 that engages with the groove 11 of the numeral 10 is formed so as to project from the inner peripheral surface. When the washer 20 is attached to the bolt 10, the groove 11 of the bolt 10 is engaged with the engagement protrusion 21 of the washer 20 to be attached. Then, the washer 20 is non-rotatably attached to the bolt 10. In addition, washer 2
0 has a plurality of holes 22, and the nut 30 has a hole 31 on the upper surface. These holes 2
Reference numerals 2 and 31 form the locking portions 22 and 31, respectively, and a locking tool 5 described later.
0 is inserted.

As shown in FIG. 2, after the nut 30 is screwed onto the bolt 10 via the washer 20 described above, the engaging member 50 is attached to the engaging portion 22 of the washer 20 and the engaging portion 31 of the nut 30. The nut 30 is locked and fixed to the washer 20 so as not to rotate. The locking tool 50 is formed by winding a linear spring steel material and projecting both ends, and both ends are inserted into the holes 22 and 31 of the washer 20 and the nut 30 described above. At this time, the hole 22 of the washer 20 corresponding to the hole 31 of the nut 30 is appropriately selected and both ends of the locking tool 50 are inserted into the holes 31 and 22, respectively. Even if there is some deviation between the holes 31 and 22, since the locking tool 50 is formed by winding a linear spring steel material,
This can be dealt with by deforming the locking tool 50.

In this way, the nut 30 is locked by the locking tool 50.
Is fixed to the washer 20, the washer 2
Since 0 is fixed to the bolt 10, that is, the nut 30 is fixed to the bolt 10, and the loosening of the screw can be prevented. When loosening the nut 30, the locking tool 50 may be removed to loosen the nut 30.
0, washer 20 and bolt 10 can be used repeatedly.

FIG. 3 shows an example in which a hole 31 forming a locking portion is provided on the side surface of the nut 30. In this case, the locking device 50
The shape of is changed, and the locking tool 50 that is projected so that both ends thereof form a substantially right angle is used. Other than this, it is the same as described above.

Next, an embodiment of claim 2 in FIGS. 4 to 7 will be described. 4 to 6 show the object to be fastened 40 by the bolt 10.
7 shows a state in which other objects to be fastened, not shown, provided with a female screw are fastened, and FIG. The object to be fastened 40 is shown by omitting parts other than the surface on the head 13 side or the nut 30 side of the bolt 10.

As shown in FIG. 4, the object to be fastened 40 is provided with an insertion hole 41 for the bolt 10 and a hole 42 in the vicinity thereof, and the washer 20 is provided with a projection for engaging with the hole 41 of the object to be fastened 40. 23 is formed so as to project from the lower surface. The hole 42 of the object to be fastened 40 forms the engaging portion 42, and the projection 2 of the washer 20
3 is an engaged portion 23. The engaging portion 42
The shape of the engaged portion 23 is not limited to this, and the engaging portion 42 is a groove such as a key groove provided adjacent to the insertion hole 41 of the bolt 10 or a protrusion protruding from the upper surface of the object to be fastened 40. The engaged portion 23 may be a protrusion or a hole that engages with the engaged portion 23. Insertion hole 41 of the object to be fastened 40
Insert the bolt 10 through the washer 20 into the
When screwing 0 into another unfastened object provided with a female screw, the projection 23 of the washer 20 is inserted into the hole 4 of the fastened object 40.
Insert into 2 and engage. Then, the washer 20 is non-rotatably fixed to the object to be fastened 40. Further, the washer 20 is provided with a plurality of holes 22, and the bolt 10 is provided with one hole 12 on the upper surface of the head 13. These holes 22 and 12 form the locking portions 22 and 12, and a locking tool 50 described later is inserted therein.

As shown in FIG. 5, after the bolt 10 is inserted into the insertion hole 41 of the object to be fastened 40 through the washer 20 and screwed to another object to be fastened (not shown), the washer 20 is locked. The locking tool 50 is locked to the portion 22 and the locking portion 12 of the head portion 13 of the bolt 10 to fix the bolt 10 to the washer 20 in a non-rotatable manner. In addition, also in this example, the same locking tool 50 as described above is used. Further, the locking portion 12 is provided on the side surface of the bolt 10.
In the case where the hole 12 is formed, a locking tool 50 having a modified shape as shown in FIG. 6 may be used.

In this way, the bolt 10 is locked by the locking tool 50.
Is fixed to the washer 20, the washer 2
Since 0 is fixed to the object to be fastened 40, that is, the bolt 10 is fixed to the object to be fastened 40, and the loosening of the screw can be prevented. In addition, when loosening the bolt 10, the locking tool 50 may be removed to loosen the bolt 10, and the bolt 10, the washer 20 and the object to be fastened 40 can be repeatedly used.

FIG. 7 shows a state in which the object to be fastened 40 and the object to be fastened (not shown) below the object to be fastened 40 are fastened by the bolt 10 and the nut 30. In this case, the washer 20
Is fixed to the object to be fastened 40 by engaging the engaged portion 23 with an engaging portion 42 provided in the vicinity of the insertion hole 41 of the object to be fastened 40. And washer 2
The washer 2 by the locking tool 50 that locks the locking portion 22 of 0
Fixed to 0. That is, the nut 30 is fixed to the fastening object 40. In this state, the bolt 10
Is in a state of being rotatable with respect to the object to be fastened 40, the washer 20 and the nut 30, it is preferable to fix the head 13 side of the bolt 10 to the side of the fastened object not shown. As this means, the means shown in FIG. 4 and the head portion 13 of the bolt are used.
There are various means such as a means for providing a hexagonal hole into which the hexagons of (3) are fitted on the side of the head 13 of the bolt 10 (not shown).

As described above, the washer 20 is provided with the plurality of engaging portions 22 and the one engaging portion 31 (12) for the nut 30 (bolt 10). At least one of the washer 20 side and the nut 30 (bolt 10) side is provided. It suffices to provide a plurality of locking portions 22 and 31 (12). It is more preferable to provide a plurality of locking portions 22, 31 (12) on both sides. In this case, as shown in FIG. 8, if the arrangement pitch angles P of at least one of the locking portions 22 and 31 (12) are unequal intervals (in this example, the locking portion 2 on the washer 20 side is used).
2 and the washer 2
0 locking portion 22 and nut 30 (bolt 10) locking portion 3
1 (12) can be variously associated.

Further, when fixing the washer 20 and the nut 30 (bolt 10) with the locking tool 50, the locking tool 50 is resisted against the force in the direction in which the nut 30 (bolt 10) loosens.
Should be working. Specifically, as shown in FIG. 9, when the holes 22 and 31 that are the locking portions 22 and 31 of the washer 20 and the nut 30 are tilted and a force is applied in the direction in which the nut 30 loosens, a linear spring steel material is obtained. Direction in which the locking member 50 made of is hard to come off from the holes 22 and 31, or the holes 22 and 31 of the washer 20 and the nut 30 are opposed to each other as shown in FIG. It is preferable to make it difficult for the locking tool 50 to come out of the holes 22 and 31 when a force is applied to. This is naturally applicable to the cases of FIGS.

Further, the locking tool 50 is not limited to one in which a linear spring steel material is wound, but may be bent as shown in FIG. 11, and the tool hole 51 is formed in the bent portion. It may be provided so that it can be easily deformed by using a dedicated tool 60 as shown in FIG. The locking tool 50 is not limited to these, and may be made of another material such as resin, and the shape thereof is not limited. Also, the washer 20 and the nut 3
The shape of the locking portions 22 and 31 (12) of 0 (bolt 10) is not limited to holes, and may be a protrusion or the like. In this case, locking corresponding to the shapes of the locking portions 22 and 31 (12). The shape of the tool 50 may be used.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the invention of claim 1.

FIG. 2 is a perspective view showing an embodiment of the invention of claim 1;

FIG. 3 is a perspective view showing an embodiment of the invention of claim 1.

FIG. 4 is a perspective view showing an embodiment of the invention of claim 2;

FIG. 5 is a perspective view showing an embodiment of the invention of claim 2;

FIG. 6 is a perspective view showing an embodiment of the invention of claim 2;

FIG. 7 is a perspective view showing an embodiment of the invention of claim 2;

FIG. 8 is a plan view showing an arrangement pattern of a lock portion between a washer and a nut.

FIG. 9 is a perspective view showing a state in which a washer and a nut are locked by a locking tool.

FIG. 10 is a perspective view showing an example of locking by a locking tool.

FIG. 11 is a perspective view showing a locking tool.

FIG. 12 is a plan view showing a dedicated tool.

[Explanation of symbols]

 10 Bolt 11 Groove 12 Locking Part (Hole) 13 Head 20 Washer 21 Engagement Protrusion 22 Locking Part (Hole) 23 Engaged Part (Protrusion) 30 Nut 31 Engagement Part (Hole) 40 Fasten Object 41 Insert Hole 42 Engaging part (hole) 50 Locking tool 51 Tool hole 60 Special tool

Claims (2)

[Claims] 1. A bolt is provided with an axial groove, and a washer is provided with an engaging projection that engages with the groove of the bolt, and the washer is non-rotatably attached to the bolt, and is locked to the washer and the nut. A lock part is provided to prevent the nut from rotating with respect to the washer by locking the locking tool to each locking part. 2. An object to be fastened having an insertion hole into which a bolt is inserted is provided with an engaging portion, and a washer is provided with an engaged portion to be engaged with an engaging portion of the object to be fastened, and the washer is fastened to the object to be fastened. Non-rotatably attached to the washer and the head of the bolt or the nut, and the locks are attached to the locks to lock the bolt or nut with respect to the washer. Prevents loosening of screws.