JP2558548B2 - Coupling and coupling structure - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupling device and its coupling structure capable of quickly coupling with a male screw or a similar member.

[Conventional technology]

The applicant of the present application, in Japanese Patent Application No. 1-171948, regards a base portion made of a plate-shaped material and an outer peripheral side end continuous with the base portion and a center side end directed toward a common center side as a free end. A coupler and its coupling structure, which has a plurality of plate-shaped engaging pieces and can be quickly coupled with a male screw or a similar member, have been proposed.

[Problems to be Solved by the Invention]

The present invention, in the engaging device and the connecting structure according to the applicant's proposal, can prevent the male screw or the like member connected to the connecting device from swinging and further improve the connecting strength, and An object of the present invention is to provide a coupling tool and a coupling structure capable of reducing the load on each engaging piece, improving the durability, and increasing the coupling strength even when using a material having little elasticity. And

[Means for solving the problem]

One of the couplers according to the present invention is made of a plate-shaped material, and has a base portion having a main surface portion and two sub-surface portions formed by being bent with respect to the main surface portion so that one ends thereof are opposed to each other. And the outer peripheral side end is cut off from the main surface part of the base part, respectively, and the outer peripheral side end is continuous with the base part and the center side end directed to a common center side is a free end. And a plurality of plate-shaped first engaging pieces, each of which is separated from the two sub-surface portions of the base portion by leaving an outer peripheral side edge, and the outer peripheral side edge is connected to the base portion and is common. A plurality of plate-shaped second engaging members arranged so that the center-side end directed toward the center side is a free end and is coaxial with and axially spaced from the first engaging piece. And a piece.

One of the coupling structures according to the present invention is one in which a male screw is inserted between the center-side ends of the first engaging pieces and the center-side ends of the second engaging pieces of the coupling tool, The end of the engaging piece on the center side is engaged with the thread groove of the male screw.

Another one of the engaging structures according to the present invention is to provide an annular groove extending in a circumferential direction between the center-side ends of the first engaging pieces and between the center-side ends of the second engaging pieces of the coupling tool. A plurality of annular groove members are provided on the outer peripheral surface, and the center-side ends of the first and second engaging pieces are engaged with the annular groove.

Another one of the couplers according to the present invention is made of a plate-shaped material, and has a main surface portion and two sub-surface portions formed by being bent with respect to the main surface portion so that one ends thereof are opposed to each other. And a base portion separated from the main surface portion of the base portion with an outer peripheral side edge left uncut, the outer peripheral side edge being continuous with the base portion, and a center side end directed toward a common center side is a free end. A plurality of plate-shaped engaging pieces, and one common cylindrical member that is respectively raised from the two sub-surface portions of the base and is coaxial with and axially spaced from the engaging pieces. It has a plurality of cylindrical surface-shaped portions forming a part and female screw portions provided on the inner peripheral side of these cylindrical surface-shaped portions.

In another one of the coupling structures according to the present invention, a male screw is inserted through the center side end of the engagement piece of the coupling tool, and the center side end of the engagement piece is engaged with the thread groove of the male screw. The male screw is screwed into the female screw portion.

[Action]

In the case of the coupling tool having the first engagement piece and the second engagement piece, when the male screw is axially pushed between the ends of the respective engagement pieces on the center side, the first and second engagement pieces are elasticized. Due to the bending deformation, the center side end of the engaging piece goes over the thread of the male screw.

When the pushing of the male screw is stopped, the center side end of each engaging piece engages with the thread groove of the male screw at that position.
Thus, the male screw can be quickly screwed to the center side end of the engaging piece without rotating the male screw with respect to the engaging device, and the engaging device and the male screw can be coupled.

Further, when the screwing position of the male screw with respect to the engaging piece of the coupler when the pushing of the male screw is stopped is deviated from the desired position, when the male screw is rotated, the center side end of each engaging piece is moved. Since it moves relatively along the thread groove of the male screw, the screwing position can be precisely adjusted to a desired position.

Even when a force is applied to the male screw in the pulling direction, at this time, if the first and second engaging pieces are inclined in the male screw pushing direction with respect to the plane perpendicular to the axial direction, Since the center side end of the joint piece is abutted more strongly by the male screw, the male screw cannot be pulled out.

Further, in this case, a second engaging piece is further provided in addition to the first engaging piece, and these two sets of engaging pieces are screwed together with the male thread, so that the male thread for the coupling tool is formed. It is possible to prevent the vibration of the joint and further improve the coupling strength, and to reduce the load on each engaging piece and improve the durability.

Also, when a material such as mild steel plate that does not have great elasticity is used as the material of the coupler, when the male screw is inserted between the ends on the center side of the engaging piece, the first engaging piece is plastically deformed. However, there is a risk that the center side end of the engaging piece may not be sufficiently engaged with the thread groove of the male screw, but the second engaging piece has a main portion of the base portion so that one end portions thereof face each other. Since it is formed by being divided into two sub-surface portions that are formed by being bent with respect to the surface portion, not only the elasticity of each engaging piece but also the elasticity of the two sub-surface portions as a whole (the elastic deformation due to this elasticity is Even if a large deformation is possible), the center side end of each engaging piece is elastically pressed by the male screw, so that the second engaging piece is less likely to undergo plastic deformation, and the engaging piece The center side end is sufficiently engaged with the thread groove of the male screw. Therefore, sufficient bonding strength can be secured as a whole.

Further, in the case of the coupling tool having the first engagement piece and the second engagement piece, when the annular groove member is axially pushed between the center side ends of the first and second engagement pieces, As in the case where the male screw is pushed in as described above, each engaging piece elastically bends and deforms, so that the center side end of each engaging piece goes over the ridge between the annular grooves. When the pushing of the annular groove member is stopped, the center side end of each engaging piece engages with the annular groove of the annular groove member at that position. Thereby, the annular groove member can be quickly engaged with the engaging member.

Further, in this engaged state, even if a force is applied to the annular groove member in the pull-out direction, the annular groove member does not come off as in the case where the male screw is inserted. And in other respects, the same effect as the case where the male screw is inserted as described above can be obtained (however, even if the annular groove member is rotated with respect to the engaging tool, the annular member is Does not move axially with respect to the fitting).

Also, in the case of a coupling having an engaging piece and an internal thread,
When the male screw is pushed between the ends on the center side of the engaging piece and into the cylindrical surface-shaped portion, the engaging piece elastically deforms and deforms so that the cylindrical surface-shaped portions are separated from each other. The threads of the side edge and the female thread section go over the threads of the male thread. Further, when the pushing of the male screw is stopped, the center side end of the engaging piece engages with the screw groove of the male screw at that position, and the screw thread of the female screw portion is screwed into the screw groove of the male screw. Thereby, the connector and the male screw can be coupled without rotating the male screw with respect to the connector.

Also in this case, the screwing position of the male screw with respect to the coupling tool can be adjusted by rotating the male screw as in the case of the engaging tool having the first and second engaging pieces.

Even if a force is applied to the male screw in the pull-out direction, if the engaging piece is inclined in the pushing direction of the male screw with respect to the plane perpendicular to the axial direction, the center side end of each engaging piece will be the male screw. And the cylindrical surface portions are deformed so as to approach each other (to reduce the diameter), and the male screw and the female screw portion are strongly abutted. I can't escape.

Also in this case, since the female screw portion is provided in addition to the engaging piece, the deflection of the male screw can be prevented, the coupling strength can be further improved, and the load on each engaging piece can be reduced. The durability can be improved.

〔Example〕

Hereinafter, the present invention will be described based on embodiments shown in the drawings.

1-8 show a first embodiment of a coupling according to the present invention.

In this embodiment, the connector 1 is formed by press-molding a metal plate material having appropriate elasticity such as steel, stainless steel, spring steel, etc., so that the base 2, the plurality of first engaging pieces 3, and the plurality of second engaging pieces 3 are formed. The engaging piece 4 is integrally formed. The base portion 2 has a rectangular main surface portion 2a and a pair of side surface portions bent at right angles from both sides of the main surface portion 2a.
2b and a direction further perpendicular to these side surface portions 2b (main surface portion 2a
It has integrally a pair of sub-surface portions 2c bent inward (in a direction parallel to the direction), and a slight gap 5 is provided between the sub-surface portions 2c.

The first engagement piece 3 is cut and raised from the main surface portion 2a of the base portion 2 with only the outer peripheral side end 3a left uncut, and the outer peripheral side end 3a is continuous with the main surface portion 2a and the center side end. 3b
Is a free end and extends radially. Each engaging piece 3 has an inclined portion 3c and a parallel portion 3d, and the inclined portion 3c is inclined so as to be lifted from the outer peripheral side end 3a toward the center side, and the parallel portion 3d is It bends from the end of the inclined portion 3c and extends in parallel to the main surface portion 2a to the center side end 3b.
A hole 6 is formed in the engaging piece 3 installation portion of the main surface portion 2a of the base portion 2.

The second engagement piece 4 is cut and raised from the vicinity of opposite ends of the pair of sub-surface portions 2c of the base 2, leaving only the outer peripheral side end 4a, and the outer peripheral side end 4a is cut and raised. And the center side end 4b is a free end and extends radially. In addition, each engaging piece 4 is parallel to the inclined portion 4c.
4d, the inclined portion 4c is inclined so as to be lifted in the same direction as the inclined portion 3c of the first engagement piece 3 from the outer peripheral side end 4a toward the center side, and the parallel portion 4d Is the inclined part 4c
It is bent from the terminal end and extends parallel to the sub-surface portion 2c to the center side end 4b. Recesses 7 are formed in the second engaging piece 4 installation portion of each sub-surface portion 2c, and these recesses 7 face each other as if forming a single hole.

 Next, the operation of this embodiment will be described.

As shown in FIG. 1, when the male screw 8 is pushed into the hole 6 and the recess 7 in the direction of the axial arrow (the direction in which the engaging pieces 3 and 4 are cut and raised), the first and second engagements are performed. By elastically deforming the coupling pieces 3 and 4, the ends 3b on the center side of the engaging pieces 3 and 4,
4b goes over the thread of male screw 8.

Further, when the pushing of the male screw 8 is stopped, the center side ends 3b, 4b of the engaging pieces 3, 4 engage with the thread groove of the male screw 8 at that position. As a result, the male screw 8 is not rotated with respect to the engaging tool 1 and the male screw 8 is engaged with the center side ends 3b and 4b of the engaging pieces 3 and 4.
The connector 1 and the male screw 8 can be quickly screwed together.

Further, when the screwing position of the male screw 8 with respect to the engaging pieces 3 and 4 of the coupling 1 when the pushing of the male screw 8 is stopped in this way is deviated from the desired position, the male screw 8 is rotated. Then, the center-side ends 3b, 4b of the engagement pieces 3, 4 relatively move along the thread groove of the male screw 8, so that the screwing position can be precisely adjusted to a desired position.

Further, even when a force is applied to the male screw 8 in the pulling direction, the first and second engaging pieces 3 and 4 are inclined in the pushing direction of the male screw 8 with respect to the plane perpendicular to the axial direction. The center-side ends 3b, 4b of the first and second engaging pieces 3, 4 are further strongly abutted by the male screw 8, so that the male screw 8 does not come off (note that the coupling 1 is Even before the screw 8 is pushed in, even if the first and second engaging pieces 3 and 4 are not inclined in the pushing direction of the male screw 8, the ends 3 on the center side of the engaging pieces 3 and 4 are not inclined.
If the diameter between b and 4b is smaller than the root diameter of the male screw 8 and the engaging pieces 3 and 4 are inclined in the pushing direction of the male screw 8 when the male screw 8 is pushed in, , Even if a force is applied to the male screw 8 in the pulling direction, the male screw 8 is still
Can't come out).

In this coupling tool 1, a second engagement piece 4 is further provided in addition to the first engagement piece 3, and these two sets of engagement pieces 3 and 4 are screwed together with the male screw 8. Therefore, the deflection of the male screw 8 can be prevented, the coupling strength can be further improved, and the load on each of the engagement pieces 3 and 4 can be reduced to improve the durability.

When a material such as mild steel plate that does not have great elasticity is used as the material of the coupling 1, the male screw 8 is attached to the engaging piece 3,
When inserted between the center side ends 3b, 4b of 4, the first engaging piece 3 is more likely to be plastically deformed, and the center side end 3b of the engaging piece 3 is sufficiently engaged with the thread groove of the male screw 8. The second engaging piece 4 may be divided into two sub-surface portions 2c formed by being bent with respect to the main surface portion 2a of the base portion 2 so that one ends thereof are opposed to each other. Since it is formed, not only the elasticity of each engaging piece 4 but also the elasticity of the two sub-surface portions 2c as a whole (the elastic deformation by this elasticity allows a larger deformation)
Also, since the center side end 4b of the engaging piece 4 is elastically pressed by the male screw 8, the second engaging piece 4 is less likely to be plastically deformed, and the center side of the engaging piece 4 is The end 4b is fully engaged with the thread of the male screw 8. Therefore, sufficient bonding strength can be secured as a whole.

FIG. 8 shows another connecting structure using the connecting tool 1. In this figure, the annular groove member 9 is rod-shaped and has a shape similar to a screw, but the plurality of annular grooves 9a formed on the outer periphery of the annular groove member 9 are not spiral but extend annularly in the circumferential direction. There is.

When such an annular groove member 9 is axially pushed into the hole 6 and the recess 7 of the coupling tool 1, the first and second engagement pieces 3 and 4 are formed.
Due to elastic bending deformation of the engagement pieces 3 and 4,
b and 4b go over the mountain between the annular grooves 9a. Further, when the annular groove member 9 is stopped from being pushed, the center side ends 3b, 4b of the engaging pieces 3, 4 engage with the annular groove 9a at that position. Thereby, the annular groove member 9 can be quickly joined to the connector 1.

When a force is applied to the annular groove member 9 in the pull-out direction, the first and second engaging pieces 3 and 4 are annular grooves with respect to a surface perpendicular to the axial direction, as in the case of the male screw 8. Since the members 9 are inclined in the pushing direction, the center side ends 3b, 4b of the first and second engaging pieces 3, 4 are more strongly abutted by the annular groove member 9, and the annular groove member 9 can't come out.

Further, also in other points, it is possible to obtain the same effects as those of the coupling structure shown in FIG. However, in this coupling structure, even if the annular groove member 9 is rotated, the first and second engaging pieces 3 and 4 continue to be engaged in the same annular groove 9a, so that the coupling tool 1 and the annular shape are annular in the axial direction. The connecting position of the groove member 9 does not change.

9 to 14 show a second embodiment of the connector according to the present invention.

Similar to the case of the first embodiment, the coupler 11 is formed by press-molding a metal plate material having appropriate elasticity such as steel, stainless steel, spring steel, etc. to form the base portion 12 and the plurality of first engaging pieces.
13, and a plurality of second engaging pieces 14 are integrally formed. The base portion 12 has a rectangular main surface portion 12a and the main surface portion 1
A pair of sub-surface portions 12c, which are respectively bent inward from both ends of 2a in an inward direction and extend obliquely with respect to the main surface portion 12a, are provided, and a slight gap 15 is provided between the sub-surface portions 12c. Has been.

The first engagement piece 13 is the main surface portion 12a of the base portion 12, respectively.
Is cut and raised with only the outer peripheral side end 13a left uncut, the outer peripheral side end 13a is continued to the main surface portion 12a, and the center side end 13b is a free end and extends radially. Here, unlike the case of the above-described embodiment, the first engagement piece 13 is not bent midway, but extends straight in a state of being inclined with respect to the main surface portion 12a. A hole 16 is formed in the engaging piece 13 installation portion of the main surface portion 12a of the base portion 12.

The second engagement piece 14 is formed by cutting and raising only the outer peripheral side end 14a from the vicinity of opposite ends of the pair of sub surface parts 12c of the base 12, leaving the outer peripheral side end 14a.
It is continuous with 2c and radially extends with the center side end 14b being a free end. These second engagement pieces 14 are not bent in the middle, and extend straight in a state of being inclined with respect to the main surface portion 12a. Recesses 17 are formed in the second engagement piece 14 installation portion of each sub-surface portion 12c, and these recesses 17 face each other as if forming a hole.

 Next, the operation of this embodiment will be described.

As shown in FIG. 14, insert the male screw 8 into the hole 16 and the recess.
When pushed in the direction of the axial arrow 17 (direction in which the engaging pieces 13 and 14 are cut and raised), as in the case of the above embodiment,
Due to the elastic bending deformation of the first and second engaging pieces 13 and 14, the center-side ends 13b and 14b of the engaging pieces 13 and 14 go over the threads of the male screw 8. When the pushing of the male screw 8 is stopped, the ends 13b, 14b on the center side of the engaging pieces 13, 14 engage with the thread groove of the male screw 8 at that position. As a result, the male screw 8 is quickly screwed into the center-side ends 13b and 14b of the engaging pieces 13 and 14 without rotating the male screw 8 with respect to the coupling device 11, and the coupling device 11 and the male screw 8 are connected. Can be combined.

The screwing position of the male screw 8 with respect to the coupling 11 can be adjusted by rotating the male screw 8 as in the case of the coupling structure shown in FIG.

Further, similarly to the case of the coupling structure shown in FIG. 1, even when a force is applied to the male screw 8 in the pulling direction, the first and second engaging pieces 13 and 14 are against the surface perpendicular to the axial direction. Since the male screw 8 is inclined in the pushing direction, the center-side ends 13b and 14b of the first and second engaging pieces 13 and 14 are further strongly abutted by the male screw 8, and the male screw 8 does not come off.

Further, similar to the case of the coupling tool 1 of the first embodiment, the coupling tool 11 is provided with the second engagement piece 14 in addition to the first engagement piece 13. Two sets of engaging pieces
Since 13 and 14 are screwed together with the male screw 8, the deflection of the male screw 8 can be prevented and the coupling strength can be further improved, and the load on each engaging piece 13 and 14 can be reduced, and the durability can be improved. Can be improved.

Further, when a material such as mild steel plate that does not have a large elasticity is used as the material of the coupling 11, the male screw 8 is attached to the engaging piece 1.
When inserted between the center-side ends 13b and 14b of 3, 14, the first engagement piece 13 is more likely to be plastically deformed, and the center-side end of the engagement piece 13 is
Although there is a possibility that 13b cannot be sufficiently engaged with the thread groove of the male screw 8, the second engagement piece 14 is formed by being bent with respect to the main surface portion 12a of the base portion 12 so that one ends thereof face each other. Since it is formed by being divided into two divided sub-surface portions 12c, not only the elasticity of each engagement piece 14 but also the two sub-surface portions 12c.
The center side end 14 of the engaging piece 14 is also caused by the elasticity of the whole (the elastic deformation by this elasticity allows a larger deformation).
Since b is elastically pressed by the male screw 8, the second engaging piece 1
4 is less likely to cause plastic deformation, and the end 1 on the center side of the engaging piece 14
4b is fully engaged with the thread groove of the male screw 8. Therefore, sufficient bonding strength can be secured as a whole.

Needless to say, the annular groove member 9 as shown in FIG.

15 to 20 show a third embodiment of the coupling device according to the present invention.

In this embodiment, the coupling tool 21 is formed by press-molding a metal plate material having appropriate elasticity such as steel, stainless steel, spring steel, etc. to integrally form the base portion 22, the plurality of engaging pieces 23, and the female screw portion 24. Formed. The base portion 22 has a rectangular main surface portion 22a, a pair of side surface portions 22b bent from both side portions of the main surface portion 22a at right angles, and a further perpendicular direction from these side surface portions 22b (parallel to the main surface portion 22a. (Direction) A pair of sub-surface portions 22c bent inward is integrally provided, and a slight gap 25 is provided between the sub-surface portions 22c.

The engagement pieces 23 are cut and raised from the main surface portion 22a of the base portion 22 with only the outer peripheral side end 23a left uncut, and the outer peripheral side end 23a is continuous with the main surface portion 22a and the center side end 23.
b is a free end and extends radially. Note that, as in the case of the second embodiment, the engaging piece 23 is not bent in the middle, but extends straight in a state of being inclined with respect to the main surface portion 22a. A hole 26 is formed in the engaging piece 23 installation portion of the main surface portion 22a of the base portion 22.

Semi-cylindrical tubular surface portions 24 are provided at the end portions of the pair of sub-surface portions 22c of the base portion 22 which face each other,
These tubular surface portions 24 face each other so as to form one common cylinder. Female threads are formed on the inner peripheral side of these cylindrical surface portions 24.

 Next, the operation of this embodiment will be described.

As shown in FIG. 20, when the male screw 8 is pushed into the hole 26 and the cylindrical surface portion 24 in the direction of the axial arrow (the direction in which the engaging piece 23 is cut and raised), the engaging piece 23 is released. By elastically bending and deforming, the two semi-cylindrical cylindrical surface portions 24 are deformed in the direction in which they are separated from each other, so that the center side end 23b of the engaging piece 23 is formed.
And the thread of the female thread portion of the cylindrical surface portion 24 goes over the thread of the male thread 8. When the pushing of the male screw 8 is stopped, the center side end 23b of the engaging piece 23 engages with the thread groove of the male screw 8 at that position, and the thread of the female screw portion of the cylindrical surface portion 24 is the male screw. It is screwed into the thread groove of No. 8. As a result, the male screw 8 is not rotated with respect to the coupling tool 21, and the coupling tool is rotated.
21 and the male screw 8 can be connected.

Then, the adjustment of the screwing position of the male screw 8 with respect to the coupling tool 21 can be performed by rotating the male screw 8 as in the case of each of the embodiments.

Further, even when a force is applied to the male screw 8 in the pulling direction, the engaging piece 23 is inclined in the pushing direction of the male screw 8 with respect to the plane perpendicular to the axial direction, so that the end of the engaging piece 23 on the center side is inclined. 23b is further strongly abutted by the male screw 8 and each cylindrical surface portion
24 is also deformed so as to approach each other (to reduce the diameter),
Since the male screw and the female screw portion of each cylindrical surface portion 24 are in stronger contact with each other, the male screw 8 cannot be pulled out.

In this coupling tool 21, in addition to the engagement piece 23, a female thread portion of the cylindrical surface portion 24 that is screwed into the male thread 8 is further provided, so that the male screw 8 is prevented from swinging and the coupling strength is increased. Further, it is possible to further improve the durability, reduce the load on the engagement piece 23, and improve the durability.

In the present embodiment, first, the male screw 8 is pushed into the hole 26 in the direction of the axial arrow, and then the male screw 8 is not pushed into the female screw portion of the tubular portion 24, but is rotated and screwed. It goes without saying that the coupling tool 21 and the male screw 8 can be coupled by doing so.

Further, in each of the above-mentioned embodiments, the coupling is made of metal, but it is also possible to use other materials such as synthetic resin other than metal as the material of the coupling.

[Effects of the Invention] As described above, the connector and the connecting structure according to the present invention are
The connecting work can be performed quickly, and (a) it is possible to prevent the run-out of a mating member such as a male screw that is connected to the connecting device. (B) The connecting device and the male screw or the annular groove member The bond strength can be further increased, (c) the load on each engaging piece can be reduced, and the durability can be improved. (D) The material of the connector is not so elastic. However, the center side end of the second engagement piece can be sufficiently engaged with the thread groove of the male screw or the annular groove of the annular groove member to increase the coupling strength, etc. Is.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a male screw and a first embodiment of a coupling according to the present invention are coupled, FIG. 2 is a perspective view showing the coupling of the first embodiment, and FIG. FIG. 4 is a plan view showing the coupler, FIG. 4 is a side view showing the coupler, FIG. 5 is a sectional view taken along line VV of FIG. 3, and FIG. 6 is a sectional view taken along line VI-VI of FIG. FIG. 7 is a sectional view taken along line VII-VII of FIG. 6, FIG. 8 is a sectional view showing a state in which the coupling member and the annular groove member are coupled, and FIG. 9 is a coupling device according to the present invention. FIG. 10 is a plan view showing the second embodiment, FIG. 10 is a cross-sectional view showing the connector of the second embodiment, FIG. 11 is a cross-sectional view taken along line XI-XI of FIG. 9, and FIG. 12 is XII of FIG. -Cross-sectional view taken along line XII, No. 13
Figure is a cross-sectional view taken along the line XIII-XIII in Figure 12, Figure 14 is a cross-sectional view showing a state in which the coupling of the second embodiment and the male screw are coupled, and Figure 15 is a coupling according to the present invention. A plan view showing a third embodiment, FIG. 16 is a side view showing the coupler of the third embodiment, FIG. 17 is a sectional view taken along line XVII-XVII in FIG. 15,
FIG. 18 is a sectional view taken along line XVIII-XVIII in FIG.
18 is a sectional view taken along the line XIX-XIX in FIG. 18, and FIG. 20 is a sectional view showing a state in which the connector of the third embodiment and the male screw are connected. DESCRIPTION OF SYMBOLS 1 ... Coupler, 2 ... Base part, 2a ... Main surface part, 2c ... Sub-surface part, 3 ... First engaging piece, 3a ... Outer peripheral side end of the first engaging piece, 3b. 1st engagement piece center side end, 4 ... 2nd engagement piece, 4a ... 2nd engagement piece outer peripheral side end, 4b ... 2nd engagement piece center side end, 8 ...... Male screw, 9 …… Annular groove member, 9a…
... annular groove, 11 ... connector, 12 ... base part, 12a ... main surface part, 12c ... sub-surface part, 13 ... first engaging piece, 13a ... outer peripheral side of the first engaging piece End, 13b ... center end of first engaging piece, 14 ... second engaging piece, 14a ... outer peripheral side end of second engaging piece, 14b ... of second engaging piece End on the center side, 21 ... Coupling, 22 ... Base, 22a ... Main surface, 22c ... Secondary surface, 23 ...
... Engaging piece, 23a ... Outer peripheral side end of the engaging piece, 23b ... Center side end of the engaging piece, 24 ... Cylindrical surface portion, 25 ... Gap.

Claims (5)

(57) [Claims] 1. A base made of a plate-shaped material, the base having a main surface and two sub-surfaces formed by bending the main surface so that one ends thereof face each other, and the base, respectively. A plurality of plate-shaped parts which are separated from the main surface part with the outer peripheral side edge left uncut, the outer peripheral side end being continuous with the base part, and the central side end facing the common central side being a free end Of the first engaging piece and the two sub-surface portions of the base portion, respectively, which are separated from each other by leaving an outer peripheral side end, and the outer peripheral side edge is continuous with the base portion and is directed to a common center side. And a plurality of plate-shaped second engaging pieces that are coaxial with the first engaging piece and are axially spaced apart from each other. It is a binding tool. 2. A base made of a plate-shaped material, the base having a main surface and two sub-surfaces formed by bending the main surface so that one ends thereof face each other, and the base, respectively. A plurality of plate-shaped parts which are separated from the main surface part with the outer peripheral side edge left uncut, the outer peripheral side end being continuous with the base part, and the central side end facing the common central side being a free end And a plurality of engaging pieces, each of which is raised from the two sub-surface portions of the base and constitutes a part of a common cylinder coaxial with and axially spaced from the engaging piece. A coupling tool having a tubular surface portion and a female screw portion provided on the inner peripheral side of these tubular surface portions. 3. A male screw is inserted between the center-side ends of the first engagement pieces and between the center-side ends of the second engagement pieces of the connector according to claim 1, and the first and second engagement members are inserted. A connecting structure in which the center side end of the joint piece is engaged with the thread groove of the male screw. 4. A plurality of annular grooves extending in the circumferential direction are formed on the outer peripheral surface between the center-side ends of the first engaging pieces and between the center-side ends of the second engaging pieces of the coupling tool according to claim 1. A coupling structure formed by inserting an annular groove member provided and engaging the center-side ends of the first and second engaging pieces with the annular groove. 5. A male screw is inserted between the center side ends of the engaging pieces of the coupling tool according to claim 2, and the center side ends of the engaging pieces are engaged with the thread grooves of the male screw and the female thread is formed. A coupling structure in which the male screw is screwed into the screw portion.