JPS6352249B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a single type double nut.

A double nut is known in which two separate nuts are individually screwed onto a bolt and the two nuts are pressed against each other.

For example, a lower nut with an inverted truncated conical recess whose center axis coincides with the axial center of the female thread, and an inverted truncated conical recess with a center axis slightly eccentric with respect to the axial center of the female thread. First tighten the lower nut against the bolt, then tighten the upper nut onto the bolt, so that the upper nut overlaps the lower nut and the recess and the projection are connected. A double nut is known in which the female threads of an upper nut and a lower nut interfere with the male threads of a bolt by contact engagement.

However, in such a double nut, the upper nut and the lower nut are individually screwed onto the bolt, so the work of tightening the nut to the bolt is significantly extended, making it difficult to perform efficient nut tightening work.

Moreover, in the double nut described above, the inverted truncated cone-shaped recess and the protrusion contact and engage, so when the upper nut and the lower nut are pressed together excessively, the diameter of the recess expands due to the eccentric protrusion. It may be destroyed.

The present invention has been made in view of the above points,
The purpose of this is to not only enable efficient nut tightening work, but also to eliminate the risk of damage due to excessive tightening, to have a good locking effect, and to perform tightening work in an integrated state. The purpose of the present invention is to provide a single type double nut that can be used in various ways.

According to the present invention, the object has a first nut, a first central axis eccentric from the axis of the female thread of the first nut, and a first nut provided on the surface of the first nut. a cylindrical upper inner wall, a second nut, and a second nut having a second center eccentric from the axis of the female thread of the second nut; The second surface facing the
a cylindrical outer wall provided on the surface of the nut; an annular plate formed of an elastic material disposed between the first nut surface and the second nut surface; plate members formed of metal materials overlapped in the axial direction, the inner wall and the outer wall are in contact with each other, and the axes of the female threads of the first and second nuts are coaxial. In their respective arrangement, the respective internal threads are achieved by a single piece double nut forming a continuous internal thread in the phase relationship of the threads.

Hereinafter, preferred embodiments of the present invention will be explained based on the drawings.

1 and 2, the single-piece double nut 1 consists of a lower nut 2 and an upper nut 3, and the lower nut 2 has a convex portion formed by a cylindrical outer wall on the upper surface 5 facing the seat surface 4. 6, and the convex portion 6 is formed with a center axis eccentric from the axis of the female thread 7 of the lower nut 2. Female thread 7 has convex portion 6
It is also arranged on the inner circumferential surface of. The upper nut 3 has a recess 9 formed by a cylindrical inner wall corresponding to the protrusion 6 on the seat surface 8.
are fitted in frictional contact. Between the upper surface 5 of the lower nut 2 and the seat surface 8 of the upper nut 3, there is a vibration absorbing plate 10 as an annular plate made of an elastic material.
and a mild steel plate 11 as a plate member made of a metal material. The female thread 13 and the female thread 7 are set so that the female thread 13 of the lower nut 2 and the female thread 7 of the lower nut 2 constitute a continuous series of threads. That is, the nuts 3 and 2 are screwed into a member to be screwed, for example, a bolt, in a state where the recess 9 and the protrusion 6 are fitted in a state of frictional contact, and the axes of the respective female threads are coaxial. In order to make it possible, a virtual female thread is created in the space between the nut 3 and the nut 2, and the female thread 13 and the female thread 7 become a continuous series of female threads via this virtual female thread. In other words, the female thread 13 and the female thread 7 are integrally configured so that they are continuous in phase relationship. At this time, lower nut 2
The corner 14 of the upper nut 3 is aligned with the corner 15 of the upper nut 3.

A protrusion 16 is integrally provided on the mild steel plate 11 as a means for restraining the relative positions of the upper and lower nuts in the rotational direction around the screw axis, and the length of the protrusion 16 is greater than the thickness of the vibration absorbing plate 10. It is set to be slightly shorter. The vibration-absorbing plate 10 is preferably made of an elastic material such as synthetic rubber, nylon, or a composite material of metal powder and plastic that has vibration-absorbing properties.

As shown in FIGS. 3 and 4, the plate 12 is made by overlapping a mild steel plate 11 on a vibration absorbing plate 10, and placing the vibration absorbing plate 10 directly on the upper surface 5 of the lower nut 2.
The protrusion 16 may be formed by bending the end of the mild steel plate 11 onto the side surface of the vibration absorbing plate 10.

Single type double nut 1 configured as above
In this case, when the female thread 13 and the female thread 7 form a continuous thread as described above and the corner portions 14 and 15 are aligned, a downward movement occurs due to frictional contact between the convex cylindrical portion 6 and the concave cylindrical portion 9. Since the nut 2 and the upper nut 3 can be kept in an integrated state, that is, as if they were a single nut, the lower nut 2 and the upper nut 3 can be tightened simultaneously with a power tool, etc., and then only the upper nut 3 can be tightened. By applying additional torque, a reliable locking effect can be achieved.

That is, the lower nut 2 and the upper nut 3 are screwed onto the bolt at the same time, and are tightened onto the object to be tightened using a power tool until a predetermined initial tightening force is obtained.
At this time, the lower nut 2 mainly receives the load from the object to be tightened via the bolt. Next, additional torque is applied to only the upper nut 3 using a power tool, and the upper nut 3 is tightened onto the lower nut 2 via the plate 12. At this time, the upper nut 3 and the lower nut 2 are rotated relative to each other, and the convex cylindrical part 6 and the concave cylindrical part 9 are eccentric with respect to the axes of the female threads 7 and 13. The cylindrical portions 9 strongly contact and interfere with each other, and the female thread 7 and the female thread 13 strongly contact and interfere with the male thread of the bolt to prevent the double nut 1 from loosening.

When additional torque is applied to the upper nut 3 and the upper nut 3 is tightened onto the lower nut 2, the vibration absorbing plate 10 is compressed and deformed between the upper nut 3 and the lower nut 2. When the protrusion 16 of the nut 11 comes into direct contact with the upper surface 5 of the lower nut 2, the protrusion 16 comes to function as a stopper to limit the proximity of both nuts against excessive tightening of the upper nut 3, and the nut is not tightened like a conventional double nut. This can effectively prevent the phenomenon of nut breakage.

Furthermore, the vibration absorbing plate 10 made of nylon or the like is
As mentioned above, when the double nut 1 is placed on the object to be tightened and set in the locking state, it is compressed and deformed between the upper nut 3 and the lower nut 2, and this compressed and deformed vibration is absorbed. Even if vibrations are applied to the object to be tightened, the body 10 can absorb vibrations transmitted from the object to the lower nut 2 well, and can ensure vibrations transmitted from the lower nut 2 to the upper nut 3. This can further ensure the locking effect of the double nut 1.

In addition, as shown in FIGS. 5 and 6, a mild steel plate 1
1 is formed to protrude laterally from both the upper and lower nuts, and the double nut 1 is formed to prevent loosening.
After setting double nut 1 to the locking state,
As shown in FIG. 7 and FIG.
They may be folded over each other to completely restrict the relative rotation of both the upper and lower nuts. At this time, a notch 20 is provided in the flat part 18 of the lower nut 2 as shown in FIG. 21 is provided, and the duffel nut 1
After the nut is set to a locking state, one of the protruding parts 17 may be folded back from the notch 20 to the flat part 21 to completely restrain the relative rotation of both the upper and lower nuts. Alternatively, the flat portion 21 may be omitted and the protruding portion 17 may be folded back from the notch 20 on the flat portion 19.

Furthermore, in the present invention, in addition to the above-mentioned specific example, as shown in FIG. Means 24 may be provided to limit the range of additional rotation of only the upper nut.

In FIG. 9, this means 24 includes a first locking recess 25 formed on the outer circumferential surface of the convex portion 6, and a first locking recess 25 that protrudes from the inner peripheral surface of the recess 9 and locks in the first locking recess 25. and a guide groove 27 extending in the circumferential direction from the locking recess 25 on the outer peripheral surface of the convex portion 6.
The locking means 26 includes a ball 28 and a spring 29 that presses the ball 28 onto the outer peripheral surface of the convex portion 6.
and the upper nut 3 as the outer peripheral surface of the recess 9.
After drilling a hole 30 in the vertical direction from the flat part 19 and arranging the ball 28 and the spring 29 in the hole 30,
In order to keep the ball 28 locked in the locking recess 25, the cap 31 may be screwed into the hole 30 from above the spring 29. In addition, the locking recess 25 has a ball 28
It is preferable that the guide groove 27 is formed in a hemispherical shape to better receive the guide groove 27, and the guide groove 27 is formed shallower than the groove 25, and extends from the first locking recess 25 in the advancing direction of the female thread 7 with the same lead angle as the female thread 7. It is preferable to form the cross section into an arcuate shape corresponding to the shape of the ball 28. Furthermore, a second locking recess 32 is preferably formed at the end of the guide groove 27, and the locking recess 32 is also preferably formed in a hemispherical shape to better receive the ball 28. The hole 30 may be set in such a position that the spring 29 can apply said additional torque and can better press the ball 28 onto the recesses 25, 32 and the groove 27.

The means 24 for limiting the range of additional rotation of only the upper nut is such that the ball 28 is connected to the hole 30 and the locking recess 2.
5, the engagement between the concave cylindrical portion 9 and the convex cylindrical portion 6 which are in a state of frictional contact can be ensured more reliably, and the female thread 7 and the female thread 13 are engaged with the plate 12.
The relative positional relationship between the female threads 7 and 13 can be maintained more reliably in order to form a continuous spiral similar to that described above.

As described above, when both the upper and lower nuts 2 and 3 are tightened together with an electric tool or the like, and then additional torque is applied only to the upper nut 3, the inner circumferential surface of the concave cylindrical portion 9 becomes the convex cylindrical portion. 6, the ball 28 is pushed out from the first locking recess 25, slides in the guide groove 27, and finally locks in the second locking recess 32. In this state, female thread 7
The convex cylindrical portion 6 and the concave cylindrical portion 9, which are eccentric with respect to the axes of the bolts and 13, strongly contact and interfere with each other, and the female threads 7 and 13 strongly contact and interfere with the male thread of the bolt. Since the ball 28 is locked in the second locking recess 32, the reliable locking action of the single-piece double nut 1 can be maintained for a long period of time.

In a specific example of the present invention in which a means 24 for connecting both the upper and lower nuts is provided, the plate 1
2 is not necessarily necessary, but both the upper and lower nuts 2 and 3
A gap equal to the thickness of the plate 12 is provided in between,
The female thread 7 and the female thread 13 may form a continuous spiral as described above with this gap in between. Further, in all the specific examples, the plate 12 may be formed of only a vibration absorbing plate, or the surface 9a and the surface 6a may function as the above-mentioned stoppers. The lower nut 2 and the upper nut 6 are preferably formed of hexagonal nuts, but are not necessarily limited to this, and may be square nuts or dodecagonal nuts.

Further, a concave cylindrical part is formed in the lower nut 2 in place of the convex cylindrical part 6, and a convex cylindrical part is formed in the upper nut 3 in place of the concave cylindrical part 9, so that the concave cylindrical part of the lower nut 2 and the upper nut 3 The convex cylindrical portion may be fitted in a frictional contact state.

From the above-mentioned structure, the single-piece double nut of the present invention has the screwed member, For example, it can be screwed into a bolt, the nut installation work can be done in one operation, and the installation is completed, that is, one of the first and second nuts is attached to the part to be tightened. The other of the first and second nuts is further rotated from the fixed state to apply a tightening force, thereby causing relative rotation between the first and second nuts, and A strong contact pressing force can be obtained between the inner wall and the outer wall, each having a central axis eccentric with respect to the axis of the inner wall, and loosening work can be performed with a single touch. Therefore, with the single-piece double nut according to the present invention, the mounting operation and the locking operation for fixing the mounted state can be carried out quickly and reliably in a simple procedure.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a single type double nut according to the present invention, Fig. 2 is a sectional view taken along the line A--A in Fig. 1, Fig. 3 is a plan view of the combination plate, and Fig. 4 is a B in Fig. 3.
- A sectional view taken along line B, FIG. 5 is a plan view showing another specific example of the combination plate shown in FIG. 3, and FIG.
7 is a plan view showing another example of the double nut according to the present invention, FIG. 8 is a front view and a partial sectional view of the double nut shown in FIG. 7, and FIG. 1 shows a cross section taken along the line AA in FIG. 1, and is an explanatory diagram showing a specific example different from the specific example shown in FIG. 2. 2...Lower nut, 3...Upper nut, 6...Convex portion, 7, 13...Female thread, 9...Concave cylindrical portion, 12
……plate.

Claims (1)

[Claims] 1 The first nut has a first central axis eccentric from the axis of the female thread of the first nut,
It has a cylindrical inner wall provided on the surface of the first nut, a second nut, and a second central axis eccentric from the axis of the female thread of the second nut,
a cylindrical outer wall provided on a surface of the second nut opposite to a surface of the first nut to abut against the inner wall; and a surface of the first nut and a surface of the second nut. consisting of an annular plate formed of an elastic material disposed therebetween, and a plate member formed of a metal material superimposed on the annular plate in the axial direction, and the inner wall and the outer wall are brought into contact with each other, and a single type double nut, in which the axes of the female threads of the first and second nuts are arranged coaxially, and the respective female threads form a continuous female thread in the phase relationship of the screws. . 2. Claim 1, characterized in that a protrusion extends integrally from the outer peripheral edge of the plate member in the thickness direction of the annular plate, and the extension dimension of the protrusion is slightly smaller than the thickness of the annular plate. Single type double nut described in item 1. 3 having a first nut and a first central axis eccentric from the axis of the female thread of the first nut;
It has a cylindrical inner wall provided on the surface of the first nut, a second nut, and a second central axis eccentric from the axis of the female thread of the second nut,
a cylindrical outer wall provided on a surface of the second nut opposite to a surface of the first nut to abut against the inner wall; and a surface of the first nut and a surface of the second nut. It is a double nut consisting of an annular plate formed of an elastic material disposed in between, and a plate member formed of a metal material superimposed on the annular plate in the axial direction, and the double nut is tightened. is rotated, and only one of the first and second nuts is additionally rotated.
and means for restricting the relative positional relationship of the second nut in the rotational direction around the female screw shaft. 4. The plate member has at least two portions protruding laterally from the first and second nuts, one of the protruding portions being on a side surface of the first nut, and the other being on a side surface of the first nut. 4. The single-piece double nut according to claim 3, wherein the single-piece double nut is folded over a side surface of the nut to constitute means for restricting the relative positional relationship between the first and second nuts. 5 A first nut having at its end a concave cylindrical part eccentrically located at the same eccentricity on a coaxial and concentric female screw shaft with respect to mutually equal outer peripheral shapes, and a convex cylindrical part fitting into the concave cylindrical part at its end. When combined with the second nut, the appearance looks like a single nut, with the cylindrical parts of both nuts,
Although there is a gap on the outer end surface, the female threads of both nuts form a continuous female thread and are fixed.
As the fixing means, from the fixing point on the inner wall of the concave cylinder of the first nut toward one of the hemispherical recesses at both ends of the spiral guide groove provided on the outer wall surface of the convex cylinder of the second nut. A single type double nut with a ball that is protruded by a spring. 6 After the double nuts are simultaneously tightened like a single nut, when only the first nut is relatively rotated additionally, the ball exits the recess at one end, rolls along the spiral guide groove, and reaches the other end. 6. The single-piece double nut according to claim 5, wherein the nut is locked in a recess so that the range of relative rotation of the first nut is limited. 7. The single-piece double nut according to claim 5, characterized in that an elastic plate is arranged within the interval. 8. The single-piece double nut according to claim 7, wherein the elastic plate is a vibration absorbing plate.