JP2002323030A - Nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nut enhancing an effect to prevent loosening, falling-out of a male screw and play between the male screw and the nut. SOLUTION: An engaging member 3 comprising a plate material with elasticity and containing a plurality of engaging pieces 6 is fitted to a nut body 2. In an initial state, the engaging pieces 6 are protruded outward from a flange 2a side of one side of the nut body 2 with regard to the axial direction of 3 nut 1. When the nut 1 is fastened, the engaging pieces 6 are axially pressed by a fastened matter 10 or the like, so that the engaging pieces 6 are deformed and then their points 6a are moved to a side of an axial line (an inner side) of a threaded hole 4 to get strongly into thread grooves 11 of the male screw 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an engaging member formed of a plate-like material having elasticity attached thereto, and a plurality of engaging pieces provided on the engaging member have tips of nut bodies. The present invention relates to a nut capable of preventing loosening or the like by being engaged with a thread groove of a male screw such as a bolt screwed into the nut.

[0002]

2. Description of the Related Art Examples of conventional nuts of this type are disclosed in Japanese Utility Model Publication No. 46-8496 and Japanese Utility Model Application Laid-Open No. 59-37417. It was housed in the main body, and the configuration was such that the engaging member did not protrude outside the nut main body.

As another example, Japanese Patent Application Laid-Open No. H8-2329
In these nuts, a concave portion is provided on one seat surface side of the nut body, and the distal end side of the engaging piece is accommodated in the concave portion.

[0004]

However, the nuts described in Japanese Utility Model Publication No. 46-8496 and Japanese Utility Model Application Laid-Open No. 59-37417 have the entire engaging member housed in the nut body and include this nut. There has been no configuration in which the tip of the engagement piece is cut into the thread groove of the male screw using the fastening force of the fastening structure. Therefore, there is a problem that the loosening prevention effect is not sufficient. Further, the rigidity of the engaging piece is increased, and the tip of the engaging piece is located at an inner position where the engaging piece sufficiently engages with the thread groove of the male screw from the beginning, so that the nut body is engaged when screwing the nut body to the male screw. Since the tip of the mating piece also enters the thread groove of the male thread while rotating, there is also a problem that the thread of the male thread is easily damaged by the tip of the engaging piece (the tip of the engaging piece). Since the position accuracy and shape of the thread cannot be made equal to the thread of the female thread of the nut body, if the rigidity of the engagement piece is large, the thread of the male thread is easily damaged.)

[0005] Also, most of the nuts disclosed in the above-mentioned Japanese Patent Application Laid-open No. Hei 8-232941 make the rigidity of the engaging piece relatively small so that the engaging piece is easily elastically deformed. At first, when the nut is moved relatively linearly in the axial direction without rotating relatively to the male screw, the engaging piece elastically bends and deforms, and the tip of the engaging piece becomes the thread of the male screw. When the movement in the axial direction is stopped, the tip of the engagement piece engages with the thread groove of the male screw. For this reason, although the male screw is relatively hard to be damaged by the engaging piece, a concave portion is provided in the seating surface of the nut body, and the distal end side of the engaging piece is accommodated in the concave portion. There was a problem that the cost was high. Further, as in the case of the nuts described in JP-B-46-8496 and JP-A-59-37417, the tip of the engagement piece is cut into the thread groove of the male screw by using the tightening force of the fastening structure. There was a problem that the effect of preventing loosening and the like could not be increased. (In the nut disclosed in the above-mentioned Japanese Patent Application Laid-Open No. H8-232941, a part of the engaging member is projected outside the recess. When the nut is tightened, the portion protruding out of the concave portion is pushed by the material to be fastened, so that the tip of the engaging piece housed in the concave portion bites into the thread groove of the male screw. In the embodiment of the present invention, the tip of the engaging piece can be cut into the thread groove of the external thread by using the tightening force of the nut, but it is also necessary to provide a concave portion on one seat surface side of the nut body. Tsu was).

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and one object of the present invention is to prevent loosening, prevent a male screw from coming off, and prevent rattling (prevention of rattling between a nut and a male screw). An object of the present invention is to provide a nut capable of increasing the effect.

Another object of the present invention is to provide a nut capable of performing a function of preventing loosening, falling off and backlash without providing a concave portion on one seat surface side of the nut body.

Another object of the present invention is to provide a nut which is less likely to damage a male screw which is a mating partner.

Another object of the present invention is to provide a nut which does not easily damage the workpiece. Still other objects of the present invention will become apparent from the following description.

[0010]

SUMMARY OF THE INVENTION A nut according to the present invention comprises:
A nut body provided with a screw hole, an engaging member attached to the nut body, formed of an elastic plate-shaped material, and a tip provided in the engaging member, In a nut having a plurality of engagement pieces protruding toward the axis side, at least in an initial state, at least a portion including the tip of the engagement piece has an axial direction of the nut body of the nut body. The engaging piece protrudes outward from one seat surface side, and when the engaging piece is pressed from the outside toward the nut in the axial direction and the seat surface side, the tip moves toward the axis of the screw hole. It is transformed so that

In the nut of the present invention, when the nut or the male screw is tightened, the engaging piece is pressed axially and toward the nut body by the fastening member or the like, and the engaging piece is deformed. Then, the tip of the engagement piece moves toward the axial side (inside) of the screw hole and bites into the screw groove of the male screw. Therefore, it is possible to increase the effects of preventing loosening, falling off and backlash.

In addition, there is no need to provide a concave portion on one of the seat surfaces of the nut main body, and the manufacturing cost can be reduced.

Further, since the tip of the engaging piece can be cut into the thread groove of the external thread by utilizing the tightening force of the fastening structure, the locking piece can be prevented from loosening and coming off without increasing the rigidity of the engaging piece so much. Since the backlash effect can be increased, the male screw can be hardly damaged. In addition, in the initial state, if the tip of the engaging piece is located outside the outer diameter of the male screw, it is possible to prevent the tip of the engaging piece from contacting the male screw before tightening. Can be difficult. Even when the tip of the engagement piece is located inside the outer diameter of the male screw from the beginning, it is possible to make the male screw harder to be damaged by not positioning it too deeply inside.

If the engaging member is rotatably attached to the nut body, when the engaging member comes into contact with the material to be fastened when tightening the nut, the engaging member stops rotating with respect to the material to be fastened, After that, only the nut body is rotated,
The fastening member is less likely to be damaged by the engaging member.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings.

[0016]

1 to 5 show a first embodiment of the present invention. In this first embodiment, a nut 1 is a nut body 2
And an engaging member 3. The nut body 2
It is made of metal such as steel and has a hexagonal nut shape, and a screw hole 4 penetrating through the nut main body 2 is provided at the center thereof.

The engaging member 3 is formed by press-forming a metal plate having an appropriate elasticity such as a steel plate, a stainless steel plate, a spring steel plate or the like. The base 5 and the plurality of engaging pieces 6 are integrally formed. Have. The base 5 has a hexagonal frame shape roughly corresponding to the outer shape of the nut body 2, and is spot-welded or projected onto the seat surface 2 a in a state of being superposed on one of the seat surfaces 2 a of the nut body 2. By being welded, it is fixedly attached to the nut main body 2 (7 indicates a welded portion).

When the nut 1 is viewed from the axial direction as shown in FIG. 1, the engaging piece 6 projects radially from the base 5 toward the axis A of the screw hole 4 (see FIG. 3). I have.
The tip 6a of the engagement piece 6 has an arc shape coaxial with the screw hole 4. When viewed in a longitudinal section as shown in FIG. 3, the engaging piece 6 is in the initial state where no external force is applied.
3 protrudes outward from the seating surface 2a side (in the direction opposite to the nut body 2 and upward in FIG. 3), and the distal end 6a of the engaging piece 6 is screwed into the screw hole 4 as shown in FIG. The outer diameter D of the shaft portion 8b of the male screw 8 such as a bolt to be formed is located outside. The engagement piece 6 is provided on the seat surface 2a.
It is curved so as to be concave with respect to.

Next, the operation of this embodiment will be described with reference to an example of a fastening structure shown in FIGS. When the shaft portion 8b of the male screw 8 having the head 8a is inserted into the fastening members 9 and 10, and the nut 1 is screwed into the male screw 8 with the engaging piece 6 side facing the fastening member 10, In the initial state, as shown in FIG. 4, the tip 6a of the engagement piece 6 is located outside the outer diameter D of the male screw 8, so that the tip 6a does not contact the male screw 8 halfway.

However, as shown in FIG. 5, when the engaging piece 6 comes into contact with the material 10 to be fastened, the engaging piece 6 is pressed axially and toward the seat surface 2a by the material 10 to be fastened. 6 is deformed, and the tip 6a of the engagement piece 6 moves toward the axis A of the screw hole 4 (inside). Therefore, as the nut 1 and / or the male screw 8 are tightened, the tip 6a of the engaging piece 6 bites into the screw groove 11 of the male screw 8, and a large locking, loosening and rattling effect can be obtained.

Further, unlike the case of the nut 1 disclosed in the above-mentioned Japanese Patent Application Laid-Open No. Hei 8-232941, it is not necessary to provide a recess on one of the seating surfaces 2a of the nut body 2, so that the manufacturing cost is reduced. be able to.

Further, since the tip 6a of the engaging piece 6 can be cut into the thread groove 11 of the male screw 8 by utilizing the tightening force of the fastening structure, the engaging piece 6 can be loosened without increasing the rigidity so much. Since the effect of stopping, retaining and backlash can be increased, the external thread 8 can be hardly damaged. Moreover, in this embodiment, since the tip 6a of the engagement piece 6 is located outside the outer diameter D of the male screw 8 in the initial state, the tip 6a of the engagement piece 6 does not contact the male screw 8 until it is tightened. Therefore, the male screw 8 can be made harder to be damaged.

FIGS. 6 to 9 show a second embodiment of the present invention. In this embodiment, in the initial state, FIG.
As shown in FIG. 5, the tip 6a of the engagement piece 6 is located inside the outer diameter D of the male screw 8 screwed into the screw hole 4. Other configurations are the same as those of the first embodiment shown in FIGS.

In this embodiment, the engaging member 3 is rotated integrally with the nut main body 2, and the tip 6a of the engaging piece 6 is made to enter the screw groove 11 of the male screw 8 while rotating (at this time, The tip 6a of the engagement piece 6 performs the same function as the thread of the female screw), and then the nut body 2 is screwed into the male screw 8 as shown in FIG. Then, when the engaging piece 6 is brought into contact with the material 10 to be fastened, as shown in FIG. 9, the engaging piece 6 is axially and seated by the material 10 to be fastened in the same manner as in the previous embodiment. The engagement piece 6 is deformed, and the tip 6 a of the engagement piece 6 moves toward the axis A (inside) of the screw hole 4. Therefore, as in the case of the first embodiment, as the nut 1 and / or the male screw 8 are tightened, the tip 6a of the engaging piece 6 bites into the screw groove 11 of the male screw 8 to prevent a large loosening and slipping. Stopping and rattling effects are obtained.

In the case of this embodiment, the nut 1 does not rotate relative to the male screw 8 but moves linearly in the axial direction until the male screw 8 enters the screw hole 4. The engaging piece 6 is elastically bent and deformed and its tip 6
It is also possible that a crosses the thread of the external thread 8 and engages with the thread groove 11 of the external thread 8.

Also in the present embodiment, the distal end 6a of the engaging piece 6 can be cut into the thread groove 11 of the male screw 8 by utilizing the tightening force of the fastening structure. Without increasing the size, the effect of preventing loosening, retaining and backlash can be increased, so that the male screw 8 can be hardly damaged.

In this embodiment, the tip 6a of the engagement piece 6 is located inside the outer diameter D of the male screw 8 from the beginning, but the tip 6a of the engagement piece 6 should not be located too deep inside. By doing so, the male screw 8 can be made harder to be damaged.

In this embodiment, since the tip 6a of the engaging piece 6 is located inside the outer diameter D of the male screw 8 from the beginning, the displacement of the engaging piece 6 during tightening is made relatively small. However, the tip 6a of the engagement piece 6 is sufficiently screwed into the thread groove 11 of the male screw 8.
And the height of the engagement piece 6 projecting from the seat surface 2a in the initial state can be made relatively small.

Also in this embodiment, the nut body 2
Since there is no need to provide a concave portion on one of the seating surfaces 2a, the manufacturing cost can be reduced.

FIGS. 10 to 14 show a third embodiment of the present invention. Also in this embodiment, the nut 1 is a nut body 2
And an engaging member 3. The nut body 2
It is made of a metal such as steel and basically has a hexagonal nut shape, but is provided integrally with a circular flange portion 12 (see FIG. 12) on one seat surface 2a side. A screw hole 4 penetrating through the nut body 2 is provided at the center of the nut body 2, and the screw hole 4 and the collar portion 12 are coaxial.

The engaging member 3 is formed by press-forming a metal plate having an appropriate elasticity such as a steel plate, a stainless steel plate, a spring steel plate or the like. The base 5 and the plurality of engaging pieces 6 are integrally formed. Have. The base 5 is screwed into the nut body 2 as shown by an arrow B in FIG. 10 by loosely caulking the collar 12 with the base 5 so that the base 5 covers the collar 12. The engagement piece 6 fitted rotatably about the axis A of the hole 4 includes:
1 to 5, the distal end 6a of the engagement piece 6 is located outside the outer diameter D of the male screw 8 in the initial state as shown in FIG. ing.

Next, the operation of this embodiment will be described with reference to FIGS.
This will be described using an example of a fastening structure shown in FIG. Materials to be fastened 9, 10
When the nut 1 is screwed into the male screw 8 with the engaging piece 6 side facing the workpiece 10 after the male screw 8 is inserted into the fitting piece 6 in the initial state, as shown in FIG. Since the tip 6 a is located outside the outer diameter D of the male screw 8, the tip 6 a of the engagement piece 6 does not contact the male screw 8 halfway. However, when the engaging piece 6 is brought into contact with the material to be fastened 10, the engaging piece 6 is pressed axially and toward the seat surface 2 a by the material to be fastened 10 as shown in FIG. do it,
The tip 6a of the engagement piece 6 moves toward the axis A (inside). Therefore, as the nut 1 and / or the male screw 8 are tightened, the tip 6a of the engaging piece 6 bites into the screw groove 11 of the male screw 8, and the same effect as in the first embodiment of FIGS. Obtainable.

In this embodiment, since the engaging member 3 is rotatable with respect to the nut main body 2, when the engaging member 3 comes into contact with the workpiece 10 when the nut 1 is tightened, the engaging member 3 is engaged. Since the member 3 stops rotating with respect to the work 10 and only the nut body 2 is rotated thereafter, the work 10 is less likely to be damaged by the engagement member 3.

FIGS. 15 to 18 show a fourth embodiment of the present invention. In the present embodiment, in the initial state, as shown in FIG.
Is located inside the outer diameter D of the male screw 8 screwed into the male screw 8. The other structure is the same as that of the third embodiment shown in FIGS.

In this embodiment, the same effect can be obtained by using the same as in the second embodiment of FIGS. 6 to 9 and also in the same manner as in the third embodiment of FIGS. Since the engaging member 3 is rotatable with respect to the nut body 2, the fastening member 10 is less likely to be damaged by the engaging member 3.

[0036]

As described above, according to the present invention, (a) one of the seats of the nut body, which can increase the effect of preventing loosening, retaining and backlash by utilizing the tightening force of the fastening structure. There is no need to provide a concave portion on the surface side, (c) it is difficult to damage the external thread, and (d) the member to be fastened can be made hard to be damaged by rotatably attaching the engaging member to the nut body. Excellent effects can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of a nut according to the present invention.

FIG. 2 is a front view showing the nut of the first embodiment.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a longitudinal sectional view showing a state before fastening of a fastening structure using the nut of the first embodiment.

FIG. 5 is a longitudinal sectional view schematically showing a tightened state of the fastening structure using the nut of the first embodiment.

FIG. 6 is a plan view showing a second embodiment of the nut according to the present invention.

FIG. 7 is a sectional view taken along line VII-VII in FIG. 6;

FIG. 8 is a longitudinal sectional view schematically showing a state before fastening of a fastening structure using the nut of the second embodiment.

FIG. 9 is a longitudinal sectional view schematically showing a tightened state of a fastening structure using the nut of the second embodiment.

FIG. 10 is a plan view showing a third embodiment of the nut according to the present invention.

FIG. 11 is a front view showing the nut of the third embodiment.

FIG. 12 is a sectional view taken along line XII-XII in FIG. 10;

FIG. 13 is a longitudinal sectional view showing a state before fastening of a fastening structure using the nut of the third embodiment.

FIG. 14 is a longitudinal sectional view schematically showing a tightened state of a fastening structure using the nut of the third embodiment.

FIG. 15 is a plan view showing a fourth embodiment of the nut according to the present invention.

16 is a sectional view taken along line XVI-XVI in FIG.

FIG. 17 is a longitudinal sectional view schematically showing a state before fastening of a fastening structure using the nut according to the fourth embodiment.

FIG. 18 is a longitudinal sectional view schematically showing a tightened state of a fastening structure using the nut of the fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nut 2 Nut main body 3 Engagement member 4 Screw hole 5 Base 6 Engagement piece 6a Tip of engagement piece 8 Male screw 11 Screw groove 12 Collar part A Axis line of screw hole D Outer diameter of male screw

Claims (7)

[Claims] 1. A nut body provided with a screw hole, an engagement member formed of an elastic plate-shaped material attached to the nut body, and a tip provided on the engagement member. And a plurality of engagement pieces protruding toward the axis side of the screw hole, at least in an initial state, at least a portion including the tip of the engagement piece is in the axial direction of the nut. And the engaging piece protrudes outward from one seating surface side of the nut body, and when the engaging piece is pressed from the outside toward the nut in the axial direction and the seating surface side, the tip ends with the axis of the screw hole. A nut characterized by being deformed so as to move to the side. 2. The nut according to claim 1, wherein the engagement piece is curved so as to be concave with respect to the seat surface. 3. The nut according to claim 1, wherein, in an initial state, the tip of the engagement piece is positioned outside an outer diameter of a male screw screwed into the screw hole. 4. The nut according to claim 1, wherein, in an initial state, the tip of the engagement piece is located inside an outer diameter of a male screw screwed into the screw hole. 5. The nut according to claim 1, wherein the engaging member is rotatable with respect to the nut main body around an axis of the screw hole. 6. The nut body is provided with a collar portion coaxially with the screw hole, and the engaging member has a base rotatably fitted to the collar portion. 5. The nut according to 5. 7. The nut according to claim 6, wherein the base of the engagement member is rotatably fitted by loosely caulking the collar at the base.