JPH06249221A - Bolt and nut locking device - Google Patents

Abstract

PURPOSE:To provide a device for preventing the looseness of a bolt and a nut when a fitted member is fitted therewith. CONSTITUTION:A bolt head 6 has the elastically deformable outward overhung portion 7 at the lower end. On the overhung portion 7 are two locking engagement protrusions 8 protruded downward at symmetrical positions. A fitted member 1 has a number of engagement holes 10 in the upper part, along a circle with the center on the axial line of a bolt 3 and the radius at a distance from the axial line to the engagement protrusions 8. When the fastening of the bolt 3 is completed, the engagement protrusions 8 of the bolt 3 is engaged with any one of the engagement holes 10 in the fitted member 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt and nut locking device for mounting a member to be mounted using bolts and nuts.

[0002]

2. Description of the Related Art It is common to use bolts and nuts to attach members to be attached, but when these are used in machines that are moving at high speeds, they may be subject to vibration and There is a problem that the nuts and nuts gradually loosen and the attached members come off.

Therefore, a washer is interposed in the tightening portion,
Some bolts are tied with wire, and various other methods are used to prevent the bolts and nuts from loosening.

[0004]

However, the above-described conventional loosening preventives have not been sufficiently effective in preventing the loosening, or are very time-consuming.

SUMMARY OF THE INVENTION An object of the present invention is to provide a bolt and nut locking device which can reliably and easily prevent bolts and nuts from loosening.

[0006]

According to a first aspect of the present invention, there is provided a bolt loosening prevention device, wherein an outwardly projecting portion which is elastically deformable is provided at a lower portion of a bolt head, and the projecting portion projects toward a mounted member. At least one locking protrusion for preventing loosening is provided, and on the bolt side of the mounted member or on the bolt side of the auxiliary member fixed to the mounted member bolt side, the axis from the axis of the bolt to the engaging protrusion A plurality of engaging holes are provided along a circle having a radius as a distance, and at the end of tightening the bolt, the engaging protrusion of the bolt is provided on either the mounted member or the plurality of engaging holes of the flat plate with the bolt holes. It is characterized in that it is adapted to be engaged.

According to a second aspect of the present invention, there is provided an apparatus for preventing loosening of a nut, wherein an outwardly projecting portion which is elastically deformable is provided at a lower portion of the nut, and the projecting portion projects at least one loosening preventing member. A circle with a mating protrusion provided on the nut side of the mounted member or on the nut side of a flat plate with bolt holes fixed to the mounted member nut side, with the radius from the axis of the nut to the engaging protrusion as the center. A plurality of engaging holes are provided along the above, and when the tightening of the nut is completed, the engaging protrusion of the nut is engaged with either the mounted member or the plurality of engaging holes of the flat plate with the bolt holes. It is characterized by that.

According to a third aspect of the present invention, there is provided a bolt locking device, which has an elastically deformable projecting portion projecting outward from the bolt head on the member side of the bolt head, and is integrally formed with the bolt. There is a washer that is designed to rotate,
At least 1 that projects toward the mounted member on the overhanging portion of the washer
There are two locking protrusions to prevent loosening, and the bolt side of the mounted member or the bolt side of the flat plate with bolt holes fixed to the bolt side of the mounted member is centered on the axis of the bolt and extends from the axis to the engaging protrusion. A plurality of engaging holes are provided along a circle having a radius as a distance, and when the bolt is completely tightened, the engaging protrusion of the washer is attached to either the mounted member or the plurality of engaging holes of the flat plate with bolt holes. It is characterized in that it is adapted to be engaged.

According to a fourth aspect of the present invention, there is provided a nut loosening prevention device, which has an elastically deformable projecting portion projecting outward from the nut on the mounted member side of the nut so as to rotate integrally with the nut. The washer made is disposed, and at least one loosening preventing engagement projection protruding toward the mounted member is provided on the projecting portion of the washer, and the nut side of the mounted member or the nut side of the mounted member is provided. On the nut side of the fixed flat plate with bolt holes, multiple engaging holes are provided along a circle centered on the axis of the nut and having a radius from the axis to the engaging protrusion, and a washer at the end of tightening the nut. The engaging projection of is engaged with any of the plurality of engaging holes of the mounted member or the flat plate with the bolt holes.

[0010]

In the bolt and nut locking device according to the first and second aspects of the present invention, when the bolt or the nut is tightened, the engaging projection of the overhanging portion of the bolt or the nut is elastically deformed, and the locking projection is released from the engaging hole. And the engagement with the next engagement hole are repeated. Then, finally, with the engagement projection engaged with any of the engagement holes, the bolt or nut is no longer tightened, and the attached member is fixed.

In the bolt and nut locking device according to the third and fourth aspects of the invention, when the washer is fitted onto the bolt or nut and then the bolt or nut is tightened, the washer rotates integrally with the bolt or nut. The engaging protrusion of the washer is elastically deformed and repeatedly disengages from the engaging hole and engages with the next engaging hole. Then, with the engagement projection finally engaged with one of the engagement holes,
The bolt or nut can no longer be tightened,
The member to be attached is fixed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In the following description, the upper and lower sides refer to the upper and lower sides of FIG.

1 and 2 show a first embodiment of a bolt and nut locking device according to the present invention. This locking device has a member (1) having a bolt hole (2).
It is attached by bolts (3) to the main body (5) having the female thread (4).

At the lower end of the hexagonal head portion (6) of the bolt (3), a projecting portion (7) having a circular shape when seen in a plan view is integrally provided.
The overhang portion (7) has a small thickness, and the overhang portion (7) can be elastically deformed. On the outer peripheral edge of the overhang (7), a hemispherical locking engagement protrusion (8) protruding downward.
Are provided so as to be symmetrical with respect to the axis of the bolt (3). Immediately inside each engaging projection (8),
The elastic deformation promoting slits (9) of (7) are provided respectively. The slit (9) has an arc shape along a circle centered on the axis of the bolt (3) and its length is slightly shorter than 1/2 of the circumference.

A large number of hemispherical engagement holes (10) are provided on the upper part of the member to be attached (1) along a circle centered on the axis and having a radius from the axis to the engagement projections (8). Are provided such that the other engaging holes (10) are always arranged at predetermined intervals and at a position shifted by 180 degrees with respect to one engaging hole (10).

In the bolt locking device of the first embodiment, when the bolt (6) is tightened, the overhanging portion (7)
By engaging each of the engaging projections (8) with any of the engaging holes (10) of the mounted member (1), the resistance against tightening of the bolt (6) increases. This resistance is weak at first,
When the bolt (6) is further tightened, the engaging projection (8) is elastically deformed, and is released from the engaging hole (10) and the next engaging hole.
The engagement with (10) is repeated. And the engaging protrusion (8)
With one of the engaging holes (10) engaged,
Is no longer tightened and the attached member (1) is fixed to the main body.

FIG. 3 shows a second embodiment of the bolt locking device according to the present invention. This bolt locking device has a member to be attached (1) having a bolt hole (2) as in the first embodiment. It is attached to the main body (5) having the female screw portion (4) with bolts (21), and is different from the first embodiment in bolts (6) (21).
The configuration is different, and in addition, the attached member (1) and the bolt (21)
A disk-shaped washer (23) is interposed between and.

At the lower end of the hexagonal head (22) of the bolt (21), a pair of square hole-shaped fitting recesses (24) are provided so as to be symmetrical with respect to the axis of the bolt (21). There is.

At the upper end of the washer (23), a pair of rectangular parallelepiped fitting projections (25) are fitted in the fitting recesses (24) of the bolt head (22).
Are provided so as to be symmetrical with respect to the axis of the bolt (21). The washer (23) is fitted on the bolt (21) and rotates integrally with it.

The washer (23) has a projecting portion (23a) which is circular when viewed from a plane projecting outward from the bolt head (22).
The washer (23) is thin, and the overhanging portion (23a) can be elastically deformed. At the outer peripheral edge of the overhang (23a),
Two hemispherical locking engagement projections (26) projecting downward
First, they are provided so as to be symmetrical with respect to the axis of the bolt (21). Immediately inside each engagement protrusion (26), a slit (27) is provided to promote vertical deformation. The slit (27) has an arc shape along a circle centered on the axis of the bolt (21), and its length is slightly shorter than 1/2 of the circumference.

FIG. 4 shows a third embodiment of the bolt locking device according to the present invention. This bolt locking device has a mounted member (1) having a bolt hole (2) as in the second embodiment. It is attached to the main body (5) having the female screw portion (4) by the bolt (31). The difference from the second embodiment is that the fitting recess (34) is provided in the washer (33) and the fitting projection (34) is provided. Part (35) is a bolt
It is located in (31).

That is, at the lower end of the hexagonal head portion (32) of the bolt (31), a pair of rectangular parallelepiped fitting protrusions (35) are provided.
Is provided in a downward protruding shape so as to be symmetrical with respect to the axis of the washer (33), and the washer (33) has a square hole-like fitting concave portion (31) that fits into the fitting convex portion (35) of the bolt head (22). 34) is provided so as to be symmetrical with respect to the axis of the bolt (31). The washer (33) is fitted on the bolt (31) and rotates integrally with it.

The washer (33) has a projecting portion (33a) which is circular when viewed from a plane projecting outward from the bolt head (32).
The washer (33) is thin, and the overhanging portion (33a) can be elastically deformed. At the outer peripheral edge of the overhang (33a),
There are two hemispherical locking protrusions (36) that project downward.
First, it is provided so as to be symmetrical with respect to the axis of the bolt (31). Immediately inside each engaging protrusion (36), a slit (37) for promoting vertical deformation is provided. The slit (37) has an arc shape along a circle centered on the axis of the bolt (31) and its length is slightly shorter than 1/2 of the circumference.

In the bolt loosening prevention device of the second and third embodiments, the washers (23) and (33) are fitted to the bolts (21) and (31), and then the bolts (21) and (31) are tightened. When you go
The washers (23) (33) rotate integrally with the bolts (21) (31), and the attached member (1) is fixed to the main body (5) in the same manner as in the first embodiment.

FIGS. 5 and 6 show a fourth embodiment of the bolt locking device of the present invention. This bolt locking device has a bolt member (2) as in the second embodiment. Although (1) is attached to the main body (5) having the female screw portion (4) by the bolt (41), the second embodiment is different from the bolt (21) (41) and washer (23) (43). The composition is different.

As the bolt (41) of this embodiment, a commonly used hexagon bolt (41) is used.

The washer (43) has a hexagonal head (42) of the bolt (41).
A pair of square cut-and-raised parts that hold opposite sides of each other (44)
Is provided so that the washer (43) rotates integrally with the bolt (41).

The washer (43) has a protruding portion (43a) which is circular when viewed from the plane protruding outward from the bolt head (42).
The washer (43) is thin, and the overhanging portion (43a) can be elastically deformed. At the outer peripheral edge of the overhang (43a),
Two hemispherical locking engagement projections (46) projecting downward
First, they are provided so as to be symmetrical with respect to the axis of the bolt (41). Immediately inside each engaging protrusion (46), an elastic deformation promoting slit (47) is provided. slit
(47) is an arc shape along a circle centered on the axis of the bolt (41), and its length is slightly shorter than 1/2 of the circumference.

In the bolt loosening prevention device of the fourth embodiment, the bolt head (42) is raised and cut (4) with a pair of washers (43).
When the bolt (41) is tightened after being pinched by the bolt (4), the washer (43) rotates integrally with the bolt (41), and the attached member (1) is rotated in the same manner as in the first to third embodiments. ) Is fixed to the body (5).

In the fourth embodiment, the bolt (41) is tightened by using a wrench while supporting the side surface of the bolt head (42) which is not sandwiched by the cut and raised portions (44). . Although not shown, the opposite side surfaces of the bolt head (42) sandwiched by the cut-and-raised (44) are cut and raised, and the bolt head (42) is cut by the thickness of the (44). The cut-and-raised (44) together can be tightened with a box wrench or socket wrench.

Further, in the first to fourth embodiments, the overhanging portion (7) of the bolt (3) and the overhanging portion of the washers (23) (33) (43) are used.
Although (23a) (33a) (43a) is circular when viewed from the plane, the shape of these overhanging portions (7) (23a) (33a) (43a) is not limited to this, and for example, 180 ° with each other. It is also possible to have two rectangular overhangs that project at an angle of degrees.

Further, in the first to fourth embodiments, the number of the engaging projections (8) (26) (36) (46) is two, but
The number of engaging protrusions may be one. Also, slits ((9) (27)
The numbers and shapes of (37) and (47) may be changed as appropriate.

FIG. 7 shows a fifth embodiment of the bolt locking device of the present invention. This bolt locking device uses the same bolt (3) as that of the first embodiment and has a bolt hole (5).
2) The attached member (51) that has the female threaded portion (4)
Attached to (5), the first embodiment is the member to be attached
The engaging hole (55) is provided in the flat plate (53) with bolt holes without providing the engaging hole in (51), and the flat plate (53) with bolt holes is bolted.
They are different in that they are placed between (3) and the mounted member (51).

The flat plate (53) with bolt holes has a disk shape, and a bolt hole (54) of the same size as the bolt hole (52) of the mounted member (51) is formed in the center. A plurality of flat plates (53) are arranged along the circle with the axis of the bolt as the center and the radius from the axis to the engaging projection (8) as the radius, and one of them is engaged when tightening the bolt (3). An engagement hole (55) that engages with the mating protrusion (8) is provided.

Two pin insertion holes are provided in the upper part of the attached member (51), and two through holes are formed in the flat plate (53) for inserting the upper parts of the pins (56) fitted in the respective pin insertion holes. And the flat plate (53) is fixed to the upper side of the attached member (51) by two pins (56).

In the bolt loosening prevention device of the fifth embodiment, even if it is difficult to machine a large number of engaging holes in the member to be attached (51), as long as the pin insertion holes can be provided, the first embodiment You can use the bolts (3) used in
The attached member (51) can be fixed in the same manner as in the first embodiment.

In the fifth embodiment, the member to be mounted (5
Although the pin is used to fix the flat plate (53) on the upper side of (1), the flat plate (53) can be fixed to the mounted member (51) by other means.

FIG. 8 shows a sixth embodiment of the bolt locking device of the present invention. This bolt locking device has a member to be mounted (1) having a bolt hole (2) as in the first embodiment. It is attached to the main body (5) having the female screw portion (4) with the bolt (61), and is different from the first embodiment in the bolts (3) and (61).
The overhangs (7) and (63) have different configurations.

That is, at the lower end of the hexagonal head portion (62) of the bolt (61), a projecting portion (63) having a circular shape when seen from a plane is integrally provided. At the outer peripheral edge of the overhanging portion (63), there are two hemispherical locking engagement projections (64) projecting downward and the bolt (6
It is provided so as to be symmetrical with respect to the axis of 1). A pair of elastic deformation promoting slits (65) parallel to each other are provided on both sides of each engaging protrusion (64).

In the first to sixth embodiments, the bolt (3) is used.
(21) (31) (41) (61) is explained, but the structure of these bolts (3) (21) (31) (41) (61) is to be attached to the main body with male thread The same can be applied to a nut used for mounting a member.

In the seventh embodiment shown in FIG. 9, the bolt (3) of the first embodiment and the nut (77) having the same structure as the bolt (3) are used for the first member (71) having the bolt hole (72). ) And bolt holes (7
The second member (74) having 5) is joined.

In FIG. 9, the bolt (3) is inserted from above the first member (71) on the upper side, and the nut (77) is attached to the lower end of the bolt (3) from below the second member (74) on the lower side. It is screwed together.

The bolt (3) is attached to the head (6) as described above.
The projecting portion (7) has a projecting portion (7), and the projecting portion (7) is provided with an engaging projection (8) projecting downward and an elastic deformation promoting slit (9). Similarly, the nut (75) has an overhang (78),
The protruding portion (78) is provided with an engaging protrusion (79) protruding upward and an elastic deformation promoting slit (80).

A plurality of engaging holes (73) for engaging with the engaging protrusions (8) of the bolt (3) are provided in the upper portion of the first member (71). The lower part of the second member (74) has an engaging projection (7
A plurality of engaging holes (76) for engaging with (9) are provided.

In the seventh embodiment, the engaging protrusion (8) of the bolt (3) is engaged with the engaging hole (73) of the first member (71) and then the nut (75) is tightened. Then, when the engagement protrusion (79) of the nut (75) is engaged with any one of the plurality of engagement holes (76) of the second member (74), the tightening is completed, and the two The members (71) (74) can be firmly joined.

In the above embodiment, the engaging protrusions (8) (26) (3
6) 46) (64) (79) and the engaging holes (10) (55) (76) are hemispherical, but the engaging protrusions (8) (26) (36) 46 (64) ) (79)
The shape of the engaging holes (10), (55), and (76) is not limited to this. For example, the engaging protrusions are formed in a mountain shape, and the engaging holes are formed into a continuous V-shaped hole corresponding thereto. The shape may be such that the engaging projection and the engaging hole can engage with each other.

[0047]

In the bolt and nut locking device according to the first and second aspects of the present invention, since the engaging projections of the projecting portions of the bolt and the nut engage with the engaging holes of the mounted member, And the nut will not loosen even if it is subjected to vibration.

In the bolt and nut locking device according to the third and fourth aspects of the invention, the washer rotates integrally with the bolt and the nut, and the engaging projection of the washer's overhanging portion is fitted in the engaging hole of the member to be attached. Since they are engaged, the bolts and nuts do not loosen even when subjected to vibration or the like.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a bolt and nut locking device according to the present invention.

FIG. 2 is a vertical sectional view of the same.

FIG. 3 is a perspective view showing a second embodiment of a bolt and nut locking device according to the present invention.

FIG. 4 is a perspective view showing a bolt and nut locking device according to a third embodiment of the present invention.

FIG. 5 is a perspective view showing a bolt and nut locking device according to a fourth embodiment of the present invention.

FIG. 6 is a plan view of the same.

FIG. 7 is a perspective view showing a bolt and nut locking device according to a fifth embodiment of the present invention.

FIG. 8 is a perspective view showing a sixth embodiment of a bolt and nut locking device according to the present invention.

FIG. 9 is a vertical sectional view showing a seventh embodiment of a locking device for bolts and nuts according to the present invention.

[Explanation of symbols]

 (1) (51) Attached member (3) (21) (31) (41) (61) Bolt (6) (22) (32) (42) (62) Head (7) (63) Overhang Part (8) (26) (36) (46) (64) (79) Engagement protrusion (10) (55) (76) Engagement hole (23) (33) (43) Washer (23a) (33a) (43a) Overhang (53) Flat plate with bolt holes

Claims (4)

[Claims] 1. A device for preventing loosening of a bolt when attaching a member to be attached with a bolt, wherein an outwardly projecting portion which is elastically deformable is provided on a portion of the bolt head on which the member is attached, and the projecting portion is provided. Is provided with at least one locking engagement projection protruding toward the attached member, and the bolt axis is attached to the bolt side of the attached member or the bolt side of the flat plate with a bolt hole fixed to the attached member bolt side. A plurality of engaging holes are provided along a circle whose center is the distance from the axis to the engaging protrusions.When the bolts are completely tightened, the engaging protrusions of the bolts are attached to the mounted member or a plurality of flat plates with bolt holes. A bolt locking device, characterized in that it is adapted to be engaged with any one of the engaging holes. 2. A device for preventing loosening of a nut when attaching a member to be attached with a nut, wherein an outwardly projecting portion which is elastically deformable is provided on the side of the member to be attached of the nut, and the projecting portion is provided with an outwardly projecting portion. At least one locking projection for locking that projects to the mounting member side is provided, and the nut axis of the nut is attached to the nut side of the mounted member or to the nut side of the flat plate with bolt holes that is fixed to the mounted member nut side. A plurality of engaging holes are provided along a circle whose radius is the distance from the axis to the engaging protrusion, and when the nut is completely tightened, the engaging protrusion of the nut engages the plurality of members to be mounted or the flat plate with bolt holes. A nut locking device, characterized in that it is adapted to engage with any of the holes. 3. A device for preventing loosening of a bolt when attaching a member to be attached by means of a bolt, wherein the bolt head has an elastically deformable tension extending outward from the head of the bolt. A washer having an extending portion and adapted to rotate integrally with the bolt is arranged, and the overhanging portion of the washer is provided with at least one locking engagement projection protruding toward the mounted member. On the bolt side of the mounted member or on the bolt side of the flat plate with bolt holes that is fixed to the bolt side of the mounted member, along the circle with the axis of the bolt as the center and the distance from the axis to the engaging projection as the radius, Engaging holes of the washer are provided, and the engaging projections of the washers are engaged with any of the plurality of engaging holes of the mounted member or the flat plate with the bolt holes when the bolt is completely tightened. To prevent the bolts from loosening Device. 4. A device for preventing loosening of a nut when attaching a member to be attached with a nut, wherein the nut has an elastically deformable overhanging portion that projects outward from the nut. And a washer arranged so as to rotate integrally with the nut is provided, and at least one loosening preventing engagement projection projecting to the attached member side is provided on the overhanging portion of the washer. On the nut side of the flat plate with bolt holes fixed to the nut side or the nut side of the mounted member, a plurality of engagement holes are formed along a circle whose center is the axis of the nut and whose radius is the distance from the axis to the engagement protrusion. Is provided,
A nut locking device, wherein an engagement protrusion of a washer is adapted to engage with one of a plurality of engagement holes of a mounted member or a flat plate with a bolt hole at the end of tightening the nut.