JPH0640972Y2 - Fastening member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a fastening member, and more specifically, it utilizes a so-called self-tap type stud bolt or a projection nut fixed to a body of an automobile or the like. The present invention relates to a fastening member such as a resin nut or a resin bolt for fastening a component to a body of an automobile or the like.

(Prior Art) Conventionally, there is a resin nut 1 shown in FIGS. 14 to 16, for example. The resin nut 1 includes a hexagonal nut body 2 provided with a fastening flange 3 at one end thereof, and a pilot hole 4 provided along the axis of the resin nut 1.

Then, after inserting a self-tapping type bolt 5 protruding from a body of an automobile or the like into a mounting hole of a predetermined component (not shown), a socket 6 of an automatic tool such as an impact wrench is fitted into the rectangular nut body 2. Then, the resin nut 1 was tightened with respect to the bolt 5, and the above-mentioned parts were fixed to the body with the fastening flange 3.

(Problems to be solved by the invention) By the way, in the field of such a part installation work (for example, a part assembly line to an automobile),
In consideration of mounting strength and the like, the resin nut 1 and the metal nut are often selectively used for various parts. In such a case, there is a demand for sharing the same impact wrench for tightening these two types of nuts in order to improve workability.

However, the resin nut 1 has a weaker so-called breaking torque than the metal nut, and is therefore used only when a relatively small tightening force is sufficient. For this reason,
If the impact wrench with the tightening torque set to be suitable for tightening the metal nut is used as it is, the tightening with respect to the resin nut 1 is too strong and the prepared hole 4 is destroyed, so that the parts cannot be effectively fixed. It is also possible to adjust the tightening torque of the impact wrench each time the above two types of nuts are used properly, but this is against the demand for improved workability.

Also, when the fastening member is a resin bolt that is fastened to a self-tapping type projection nut or the like and the fastening work is performed using an impact wrench together with the metal bolt, the same situation as described above is applied. This causes a problem such as breakage of the male screw on the bolt shaft.

Therefore, an object of the present invention is to allow a resin fastening member to be tightened without trouble even if an impact wrench set to an excessive tightening torque is used.

(Means for Solving the Problem) The invention according to claim (1) for solving the above-mentioned problems is provided with a prepared hole in the shaft portion of the member main body, and a fastening part for fastening the component to one end side of the shaft portion. A resin fastening member having a portion, wherein the member main body includes a tubular shaft portion having the prepared hole, and a plurality of blades provided on an outer peripheral portion of the shaft portion, and Fastening, characterized in that the blades as a whole form a rectangular outer shape that can be fitted into a tightening tool, and each blade is flexibly deformed inward by an external force of a predetermined strength or more. It is a member.

Further, the invention according to claim (2) is a resin fastening member having a threaded rod portion projecting from a shaft portion of the member body and having a fastening portion for fastening parts on the peripheral edge of the base of the threaded rod portion. Is composed of a shaft portion and a plurality of blades provided on the outer peripheral portion of the shaft portion, and these blades together form a square outer shape that can be fitted into a tightening tool, and each blade Is an elastic member that is flexibly deformed inward by an external force having a predetermined strength or more.

In the invention described in claim (1), a portion on one end side of the shaft portion of the member main body may be used as it is as a fastening portion, or a flange as a fastening portion may be formed in this portion.

The inner peripheral surface of the prepared hole may be formed smoothly, or a female screw may be formed in advance. Further, the prepared hole may be opened only on the side of the fastening portion, or may be open at both ends.

In the invention according to claim (2), the peripheral portion of the base of the threaded rod portion of the member main body may be used as it is as a fastening portion, or a flange as a fastening portion may be formed in this portion. The outer peripheral surface of the threaded portion may be formed smoothly, or a male screw may be formed in advance.

In the device according to claim (1) or (2), the plurality of blades may be integrated by being partly connected to each other within a range that does not impair the flexible deformation capability. The blade is integrally formed with the shaft portion and / or the fastening portion. However, when the blade is integrated with the fastening portion, a tightening tool (also called an impact wrench) is provided to the integrated portion and a portion in the vicinity thereof. Ribs for stoppers may be provided further on the outer side of the blades to prevent the socket of () to be fitted. A plurality of these ribs may be provided integrally with each blade, or a single annular rib may be provided to surround the outer portion of each blade.

When it is desired to loosen the tightening member once tightened, it is necessary to apply a torque in the opposite direction, which is equal to or greater than the tightening torque, to the tightening member.Therefore, the blades are spirally extended outward about the shaft. Can be issued. Alternatively, a square fitting that allows a tool (not limited to an impact wrench) to be loosened or inserted into a portion other than the blade, for example, the inner peripheral portion or the outer peripheral portion of the shaft portion or the above-described annular rib, for loosening the fastening member. You may form a part.

(Operation) When tightening the fastening member using the impact wrench, if the fastening portion of the fastening member is tightened until it comes into contact with the component, the tightening torque rapidly increases. But at this time,
The pressure applied to the blade by the socket of the impact wrench also increases and the blade flexes and deforms inward. Therefore, slippage occurs between the socket and the blade, and torque exceeding the breaking torque of the fastening member is not transmitted.

When the blade is integrated with the retaining portion, the integrated portion or a portion in the vicinity thereof is less likely to be flexed and deformed inward. However, in this case, the socket of the impact wrench is interfered with by the rib for the stopper, so that it is not fitted to such a portion.

When loosening and removing the fastening member that has been fastened for replacement or repair of parts, it is convenient that the blades are formed in a spiral shape as described above. That is, if the fastening member is tightened in the winding direction of the blade and is loosened by rotating the fastening member in the opposite direction, the blade bends inward when loosening rather than when tightening. It is difficult to transform. Therefore, by fitting and operating the tool for loosening the fastening member to the blade, it is possible to apply a torque equal to or greater than the tightening torque to the fastening member to loosen it.

Even when the blade is not formed in a spiral shape, the fastening member can be loosened by an appropriate tool by utilizing the above-mentioned square fitting portion provided on the portion other than the blade.

(Embodiment) Next, a first embodiment of the present invention will be described with reference to FIGS.

The resin nut 7 is composed of a shaft portion 8 and six blades 9 and has an overall hexagonal outer shape, and a nut body 10 provided at one end of the nut body 10 for fastening parts according to the present invention. Is integrally formed with a fastening flange 11 corresponding to.

The shaft portion 8 is a tubular body having a prepared hole 13 at the center thereof which can be tightened into a stud bolt 12 described later.

The six blades 9 project from the outer peripheral surface of the shaft portion 8 at equal intervals, and as shown in FIG.
A support piece 14 that projects radially from the shaft portion 8 and a pressure receiving piece that extends from the support piece 14 in the circumferential direction (direction of arrow a in the figure).
It consists of 15. Therefore, the six blades 9 are formed in a spiral shape with the shaft portion 8 as the center, and the hexagonal shape of the nut body 10 that fits the hexagonal nut fitting portion 17 provided in the socket 16 of the impact wrench. It constitutes the outer shape.

Further, each blade 9 has its lower end portion integrated with the flange 11, and a stopper rib 18 extending further outward is provided at a certain height at an appropriate portion of the lower end thereof.

The present embodiment is configured as described above and is used as follows.

First, a self-tapping type stud bolt 12 protruding from a body 19 of an automobile or the like is inserted into a mounting hole 21 of a predetermined component 20, while a square nut body 10 of a resin nut 7 is fitted into a socket 16 of an impact wrench. . At this time, the socket 16 is not fitted to the lower end portion of the nut body 10 because it is interfered with by the rib 18 (see FIG. 4). That is, the socket 16 does not fit into the lower end portion of the pressure receiving piece 15 which is integrated with the flange 11 and is hard to be flexibly deformed, and can be effectively flexibly deformed inward as shown by an imaginary line in FIG. Fit on the upper end side (free end side).

Then, using the torque of the impact wrench for the stud bolt 12 protruding from the mounting hole 21 of the component 20,
The resin nut 7 is tightened in the direction of arrow a in FIG. 2 until its flange 11 hits the part 20.

When the flange 11 hits the component 20, the resistance to tightening increases sharply and the tightening torque also increases correspondingly. However, at this time, in response to the increase in the pressure received from the socket 16, the pressure receiving piece 15 is flexed and deformed inward as shown by the imaginary lines in FIGS. 1 and 3, and the width across flats of the nut fitting portion 17 is increased. It is displaced to a circumferential line having a diameter W (see FIG. 2). Therefore, since slippage occurs between the socket 16 and the nut body 10, even when the impact wrench is adjusted to a torque suitable for tightening the metal nut, torque exceeding the breaking torque of the resin nut 7 is not transmitted. . Because of this, the pilot hole
There is no risk that the parts 13 will be destroyed and become stupid, and the parts 20 can be fixedly attached to the flanges 11 without any trouble.

In this embodiment, the blade 9 can be used when loosening the resin nut 7 that has been tightened for replacement or repair of the component 20. That is, the blade 9 is formed in a spiral shape, and the resin nut 7 is tightened in the direction of arrow a, which is the winding direction of the blade 9 as described above. Therefore, the operation of loosening the resin nut 7 is performed by fitting a tool such as a wrench into the nut body 10 and rotating it in the direction of arrow b, which is the opposite direction to the winding direction of the blade 9. In this case, the blade 9 is less likely to be flexed and deformed inward than when the blade is tightened. For this reason,
When a wrench or the like is turned in the direction of arrow b, a torque larger than the tightening torque is transmitted to the nut body 10, and the resin nut 7 can be easily loosened and removed from the stud bolt 12.

In the above embodiment, the lower end of the blade 9 protruding from the shaft 8 may not be integrated with the flange 11 (not shown). In this case, the entire blade 9 can be flexibly deformed, so that the rib 18 for the stopper is not necessary.

Next, a second embodiment of the present invention will be described with reference to FIG.

In the resin nut 22 of the present embodiment, the plurality of blades 24 projecting from the shaft portion 23 do not have the rib 18, but instead, the annular stopper rib 26 along the peripheral edge of the fastening flange 25. Is erected. The action of the rib 26 is the rib described above.
Similar to 18. In addition, a prepared hole (not shown) that opens only downward is provided at the center of the shaft portion 23.

The configuration, operation, and effect of other points in this embodiment are first
It is similar to the embodiment.

Next, a third embodiment of the present invention will be described with reference to FIGS. 6 and 7.

The six blades 29 projecting from the shaft portion 28 of the resin nut 27 of this embodiment include a support piece 30 along the radial direction and a pressure receiving piece integrally provided at the tip of the support piece 30 along the circumferential direction. From 31 and
It is formed so as to show a T-shaped planar shape. Each pressure receiving piece 31 has a hexagonal outer shape as a whole as shown in FIG. The pressure receiving piece 31 is the pressure receiving piece 15 in the first embodiment.
Unlike the support piece 30, the support piece 30 is formed in a T-shape. Therefore, even if the socket 32 of the impact wrench rotates in either the arrow c direction or the d direction in FIG. 7, as shown in FIG. The left and right ends are equally bent and deformed inward. Therefore, when loosening the once tightened resin nut 27, even if a wrench or the like is fitted to the blade 29 and turned in the opposite direction, a torque larger than the tightening torque cannot be transmitted to the resin nut 27. It is difficult to loosen 27. Therefore, a square fitting portion 33 is provided at the upper end of the shaft portion 28. The fitting portion 33 may be recessed, or may be a hole communicating with a pilot hole (not shown) provided in the shaft portion 28.

Then, in order to loosen the resin nut 27, a square bar member may be inserted into the fitting portion 33 and rotated in a predetermined direction.

The configuration, operation, and effect of other points in this embodiment are first
It is similar to the embodiment.

Next, an essential part of the fourth embodiment of the present invention will be described with reference to FIG.

In this embodiment, six blades 34 (only a part of which are shown) configured similarly to the blade 29 of the third embodiment are formed lower than the prismatic shaft portion 35. When the resin nut is tightened, the socket of the impact wrench is fitted to the blade 34, and when the resin nut is loosened, the top portion of the square shaft portion 35 protruding above the blade 34, that is, the fitting portion 36. Is fitted with a wrench or the like.

The parts not shown in FIG. 8 are constructed similarly to the first embodiment.

Next, a fifth embodiment of the present invention will be described with reference to FIG.

In the resin nut 37, six blades 39 having the same structure as the blade 29 of the third embodiment are projected from the circular shaft portion 38. However, stopper ribs do not protrude from these blades 39, and instead, annular ribs 40 along the outer peripheral portion of each blade 39 are provided on the fastening flange 41. The rib 40 is formed in a hexagonal ring shape,
The wall portion of the rib 40 is a fitting portion that fits a wrench for loosening the tightened resin nut 37. Therefore, the fitting portion 33 in the third embodiment is unnecessary.

The configuration, operation, and effect of other points in this embodiment are the third.
It is similar to the embodiment.

Next, a sixth embodiment of the present invention will be described with reference to FIG.

A trapezoidal rectangular fitting portion 44 is provided on the fastening flange 43 of the resin nut 42, and a nut main body 45 with a rib configured similarly to the third embodiment is provided on the fitting portion 44. ing.

The configuration, operation, and effect of other points in this embodiment are the third.
It is similar to the embodiment.

Next, a seventh embodiment of the present invention will be described with reference to FIG.

Compared with the resin nut 27 of the third embodiment, the resin nut 46 of this embodiment has a portion (a portion corresponding to the support piece 30) that connects the hexagonal shaft portion 47 and the six pressure receiving pieces 48. And the fitting part for the wrench, etc. at the center of the top of the shaft part 47 (the above-mentioned fitting part
There is no (equivalent to 33)). When loosening the tightened resin nut 46, insert a square tubular tool between the shaft 47 and the pressure receiving piece 48 to fit it into the shaft 47, and rotate the tool in the specified direction. Good.

Next, an eighth embodiment of the present invention will be described with reference to FIGS. 12 and 13.

The resin bolt 49 is formed by projecting six blades 51 from the shaft portion 50 to form a main body 52 having a hexagonal overall shape.
This is an integrally molded product made of synthetic resin in which a threaded rod portion 53 is projected from the central portion of the lower surface of 52 and a fastening flange 54 is formed on the peripheral edge of the lower surface portion of the main body 52. A rib 55 extends from each of the six blades 51.

The blades 51, the flanges 54, and the ribs 55 are configured in the same manner as the blades 9, the flanges 11, and the ribs 18 in the first embodiment.

With such a resin bolt 49, the rectangular main body 52 is fitted into the socket (not shown) of the impact wrench, and the screw rod portion 53 is inserted into the mounting hole 57 of the component 56 as shown in FIG.
And the projection nut 59 fixed to the body 58
On the other hand, using the torque of the impact wrench, the screw rod portion 53 is tightened. Thus, the parts by the flange 54
The one that fastens 56.

The operation, action, and effect at the time of tightening the resin bolt 49 and loosening the once tightened resin bolt 49 are the same as those described for the resin nut 7 in the first embodiment, but in this embodiment, Further, there is an effect that the screw rod 53 is not broken or cut.

In this embodiment, the screw rod 53 is formed separately from the main body 52, and then the screw rod 53 is screwed or press-fitted into the assembly hole provided on the lower surface side of the main body 52 to form the resin bolt 49. Is also good.

The main body 52 of the resin bolt 49 may be configured as in the second to seventh embodiments of the main body of the resin nut.

(Effects of the Invention) The fastening member according to the present invention can be tightened without trouble even if an impact wrench set with an excessive tightening torque is used. Therefore, the impact wrench used for tightening the metal nut or the metal bolt can be commonly used with the set torque as it is in the assembly line of parts for automobiles and the workability can be improved.

The fastening member according to claim (4) or (5) can be easily loosened after being once tightened, and is convenient when replacing or repairing parts.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention, FIG. 2 is a view showing a state in which it is fitted in a socket of an impact wrench, FIG. 3 is an enlarged view of a main part of FIG. 2, and FIG. Is a view showing a tightened state with an impact wrench, FIG. 5 is a perspective view of a second embodiment of the present invention, FIG. 6 is a perspective view of a third embodiment of the present invention,
FIG. 7 is a view showing a state of being fitted in a socket of an impact wrench, FIG. 8 is a perspective view showing an essential part of a fourth embodiment of the present invention, and FIG. 9 is a perspective view of a fifth embodiment of the present invention. 10 is a perspective view of a sixth embodiment of the present invention, FIG. 11 is a perspective view of a seventh embodiment of the present invention, and FIG. 12 is a perspective view of an eighth embodiment of the present invention.
FIG. 13 is a view showing its use state, FIG. 14 is a perspective view of a conventional example, FIG. 15 is a cross-sectional view taken along the line AA of FIG. 14, and FIG. 16 shows a state fitted in a socket of an impact wrench. It is a figure. 7 ... Resin nut 8 ... Shaft part 9 ... Blade 11 ... Flange 13 ... Prepared hole 16 ... Socket 18 ... Rib

Claims (5)

[Scope of utility model registration request] 1. A resin fastening member having a prepared hole in a shaft portion of a member body and having a fastening portion for fastening parts at one end side of the shaft portion, wherein the member body has the prepared hole. It has a cylindrical shaft portion and a plurality of blades provided on the outer peripheral portion of the shaft portion, and these blades together form a square outer shape that can be fitted into a tightening tool as a whole. The fastening member is characterized in that the blades are flexibly deformed inward by an external force having a predetermined strength or more. 2. A resin fastening member having a threaded rod portion protruding from a shaft portion of a member main body and having a fastening portion for fastening parts on a base peripheral edge of the screw rod portion, wherein the member main body includes a shaft portion, It is composed of a plurality of blades provided on the outer peripheral portion of the shaft portion, and these blades form a square outer shape that can be fitted into the tightening tool as a whole, and each blade has a predetermined strength or more. A fastening member characterized by being flexibly deformed inward by an external force of the. 3. An end portion of the blade is integrally formed with the retaining portion, and a rib for stopper for a tightening tool is provided on an outer peripheral portion of the blade. ) Or (2) the fastening member. 4. A blade (1), wherein the blade extends outward in a spiral shape around the shaft.
The fastening member according to (2) or (3). 5. A square-shaped fitting portion which can be fitted with a tool for loosening the fastening member is formed in a portion of the fastening member other than the blades. 2)
Alternatively, the fastening member according to (3).