JPH10169629A - Nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable intense clamping of a nut to be carried out in such a way that when one of cut end part side of the bolt screwing in side surface of a main body makes contact with a clamping target member by cutting an annular main body across a spiral groove, the other end part side makes no contact with it. SOLUTION: When a nut A1 is screw set to a bolt 4 passing through clamping target members 8, 9 and clamped, one side cut end pat 1a of an inclined bolt screw-in side surface 10a of the nut A1 makes contact with the clamping target member 8 and then the other side cut end part 1b is not in contact with the clamping target member 8. When clamping is progressed, the nut A1 gradually deforms itself and screws-in along the pitch of the bolt 4 and the cut end part 1b makes contact with the clamping target member 8. Under this condition, the pitch of a spiral groove 3 shifts, tightly meshes with the screw thread 5 of the bolt 4, so as to cause restoring force resulting in tight meshing of the nut A1 with the bolt 4. Accordingly, any spring washer etc., is not required so that workability of clamping can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement of a nut.

[0002]

2. Description of the Related Art A nut is a member which is screwed and fastened to a bolt, and is usually used between the bolt and the nut via a spring washer for fastening. This is to prevent the nut from being loosened by pressing the nut in the direction opposite to the fastening direction by the restoring force of the pressed spring washer when it is fastened.

However, using a combination of a spring washer with each bolt and nut requires using a spring washer with respect to the bolt shaft each time the fastening is performed, and then screwing and fastening the nut. It becomes complicated. In addition, if the spring washer is inserted into the bolt shaft during the fastening operation and it is damaged and dropped, the dropped spring washer must be picked up or another spring washer must be prepared, which makes the work more complicated. come.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a nut which does not require a spring washer or the like and which can be securely fastened.

[0005]

According to the invention of claim 1 of the present application, there is provided a nut having a spiral groove (3) which can be screwed with a bolt (4), wherein the annular body (1) Is cut in a direction crossing the spiral groove (3), and at least one cut end portion on at least the bolt screw-in side of the annular body (1).
When the (1a) side comes into contact with the member to be fastened (8), the other cut end (1b) side is configured to have a different contact state so as not to come into contact with the member to be fastened (8). A nut (A1) "characterized by the above-mentioned features.

In the present invention, the annular main body (1) may be formed in an apparent substantially O-ring shape in which the cut end faces are substantially in contact with each other, or are cut out so as to form a gap between the cut end faces. It may be configured as a C type. The latter substantially C-shaped configuration is preferable because deformation due to fastening is easily caused. Further, the cutting direction may be parallel to the bolt axis to be screwed, or may be inclined.

[0007] In the present invention, the structure having a difference in the contact state may be, for example, one cut end (1a) and the other cut end.
(1b) between the structure and the one cut end (1a)
Is provided with a projection (11) in the vicinity of.
In the case of the former, it may be configured as a spiral inclined surface that is continuous from one cut end to the other cut end, and a protrusion (11) is provided at one cut end (1a). It may be.

[0008] Further, the structure having a difference in the contact state is described in "Claim 2" of the present application.
0b)). It is preferable to form a difference in the abutting state on both sides in this way, since the same effect can be obtained regardless of which side is inserted into the bolt.

[0009]

According to the invention of claim 1 of the present application, the nut (A1) is connected to the bolted side surface (10a) of the nut (A1) with the fastening target member (8) (9) through which the bolt (4) is inserted. Bolt facing
When screwed into (4) and tightened, the bolt screwing side (10a)
When one of the cut ends (1a) comes into contact with the member (8) to be fastened, the other cut end (1b) does not come into contact with the member (8) to be fastened. When the fastening is further advanced as it is, the other cut end (1b) goes down along the pitch of the bolt (4) trying to abut, whereby the nut (A1) is screwed in while being gradually deformed. Becomes At this time, nut (A1)
The helical groove (3) of the nut (A1) is acted upon by a restoring force that returns the deformation
And the thread (5) of the bolt (4) are firmly engaged.

According to the invention of claim 2 of the present application,
The configuration with a difference in the contact state is on both sides (10a) (10b) of the nut (A3)
So that any surface (10a) (10b) can be bolted
The same effect can be obtained by screwing in toward (4).

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. Embodiment 1 FIG. 1 is a schematic plan view of an example of a nut according to the present invention, and FIG. 2 is a schematic front view, and FIG. 3 is a perspective view. In these figures, the nut (A1) has an annular body (1) with a spiral groove (3).
It is cut out so as to cut vertically across the
The cut portion (2) has a gap having a width L and is generally C-shaped.

As shown in FIG. 2, the surface (10a) on the bolt screw-in side is formed as a helical inclined surface having a pitch of H, and one cut end of the cut portion (2). There is a step between (1a) and the other cut end (1b).

The operation of the nut (A1) configured as described above will be described with reference to FIG. When the nut (A1) is screwed into the leg end of the bolt (4) through which the fastening target members (8) and (9) are inserted, and the nut (A1) is tightened, first, the nut (A1)
One cut end of the slanted bolt threaded side surface (10a)
(1a) comes into contact with the member (8) to be fastened. At this time, the other cut end (1b) is not in contact with the member (8) to be fastened. As the fastening is further advanced, the nut (A1) is gradually deformed and screwed in along the pitch of the bolt (4), and finally the other cut end (1b) comes into contact with the member (8) to be fastened. It will be deformed until it touches.

In this state, the nut (A1) is an annular body.
With the deformation of (1), the pitch of the spiral groove (3) is slightly shifted, and the spiral groove (3) and the screw thread (5) of the bolt (4) are firmly engaged. In addition, a restoring force generated due to deformation acts on the nut (A1), and this force causes the nut (A1)
The helical groove (3) and the screw thread (5) of the bolt (4) are more firmly engaged with each other, and are not loosened by vibration or the like.

Second Embodiment FIG. 5 is a view corresponding to FIG. 2 of another example of the nut according to the first aspect of the present invention. The nut (A2) in this example is
(10a) is not an inclined surface, and a projection (1
It is the same as Example 1 except that 1) is provided. In addition, as shown in FIG. 6, the projection (11) may be provided near the cut end (1a).

In the nut (A2) having the above structure, when the projection (11) comes into contact with the member to be fastened, the other cut end (1b) has not yet come into contact with the member to be fastened. An equivalent effect can be achieved.

FIG. 7 shows an example of a nut according to the present invention.
FIG. In this figure, the nut (A3) is the same as that of the first embodiment except that a spiral inclined surface inclined in the same direction is formed on both surfaces of the bolt screwing side surface (10a) and the opposite surface (10b). Is the same as That is, this nut (A3)
Since the same technical effect as that of the first embodiment can be obtained even when any of the surfaces (10a) and (10b) is screwed toward the bolt, there is no need to select the screw-in side surface. There is no need for re-insertion or removal at that time, so that the fastening operation can be performed more smoothly.

[0018]

According to the invention of claim 1 of the present application, the fastening can be firmly held only by the deformation generated in the nut without requiring a separate member such as a spring washer, and the workability of the fastening is improved. Can be significantly improved. According to the invention of claim 2 of the present application, since the direction in which the nut is screwed into the bolt is not selected, the nut can be prevented from being removed during the fastening operation as much as possible, and the workability can be further improved. it can.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of an example of the invention according to claim 1 of the present application.

FIG. 2 is a schematic front view of FIG.

FIG. 3 is a perspective view of FIG. 1;

FIG. 4 is a schematic front view illustrating the operation of the nut of FIG. 1;

FIG. 5 is another example of the invention according to claim 1 of the present application.
Equivalent figure

FIG. 6 is a diagram corresponding to FIG. 2 of still another example of the invention according to the “claim 1” of the present application;

FIG. 7 is a diagram corresponding to FIG. 2 showing an example of the invention according to claim 2 of the present application;

[Explanation of symbols]

 (A1) (A2) (A2 ') (A3) ... Nut (1) ... Annular body (1a) (1b) ... Cutting end (2) ... Cutting part (3) ... Spiral groove (4) ... Bolt (5 )… Bolt thread (8) (9)… Material to be fastened (10a)… Bolt screw side surface (11)… Protrusion

Claims (2)

[Claims] 1. A nut having a spiral groove which can be screwed with a bolt, wherein the annular body is cut in a direction crossing the spiral groove, and at least one cut end portion of at least a surface of the annular body on a bolt screw side. A nut having a configuration in which there is a difference in abutting state so that the other cut end side does not abut against the fastening target member when the side abuts on the fastening target member. 2. The nut according to claim 1, wherein a configuration having a difference in contact state is provided on both surfaces of the annular main body.