JPH0996308A - Insert nut and its laying method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an insert nut for plastic laying which can easily be attached to or detached from a rotation jig. SOLUTION: An insert nut 1 is tubular-shaped, and a notch part for engagement 9 is provided on one end surface, a tapping screw part 4 on outer periphery surface, and an inner screw part 5 on inner periphery surface, respectively. A rotation jig 20 is provided with an insertion body 23 provided protrusively at the central part, and also has a rotor 21 provided with a projection 22 on the lower end surface of the outer periphery and an elastic pin 24 prepared in a side of the insertion body 23. The insert nut 1 and the rotation jig 20 are connected by inserting the insertion body 23 into the insert nut 1 to engage the elastic pin 24 with the inner screw part 5 and by engaging the projection 22 with the notch part for engagement 9. Thereby, the insert nut 1 can be attached to or detached from a rotation jig 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert nut embedded in plastic and a method for embedding the insert nut.

[0002]

2. Description of the Related Art A case such as a computer or a communication device is composed of a main body (box) and a lid or a cover, and most of them are made of a plastic material. Generally, the lid and the cover are bolted to the main body. For this reason, insert nuts are embedded in a plurality of places of the main body, and correspondingly, the lid and the cover are provided with bolt insertion holes. FIG. 6 shows a state in which an insert nut 1 which has been generally used in the past is connected to an electric tool and embedded in plastic. The cylindrical insert nut 1 has the other end surface 2 and one end surface 3, and further has a tapping screw portion 4 on its outer peripheral surface and an inner screw portion 5 on its inner peripheral surface. A rotary jig 6 is coupled to a rotary shaft portion of an electric tool (not shown), and the other end surface is a connecting portion 8 having an external thread portion 7. Then, the rotating jig 6 and the insert nut 1 are connected as shown by screwing the connecting portion 8 from the one end surface 3 of the insert nut 1 to the inner screw portion 5. In this state, the insert nut 1 is embedded while being screwed into the plastic by rotating the rotary shaft portion of the electric tool while pressing the other end surface 2 of the insert nut 1 into a hole previously drilled in the surface of the plastic to be embedded. It

[0003]

However, when the insert nut 1 having the above structure is used, in order to attach / detach the insert nut 1 to / from the rotary jig 6, the rotary jig 6 and the insert nut 1 are relatively rotated and screwed together. Since it is necessary to do so, it has been one of the necks in the case of increasing the productivity in the mass production process because of the troublesome mounting work. Therefore, an object of the present invention is to provide an insert nut capable of connecting or disconnecting the rotary jig 6 and the insert nut 1 with one touch, and a method of burying the insert nut in plastic.

[0004]

That is, the insert nut of the present invention is for plastic embedding having a tapping screw portion on the outer peripheral surface having the other end surface and one end surface. A rotary jig having a rotating body having a protrusion at the outer peripheral tip thereof is provided with an engaging notch for engaging with the protrusion at at least one end face in the axial direction.
In a preferred embodiment of the insert nut, a notch having a predetermined length is provided in the axial direction from the other end surface of the insert nut, whereby the plastic cut is more efficiently performed at the other end surface of the insert nut. Further, the method for embedding an insert nut of the present invention has a rotating body provided with a protrusion and an insert body coaxially coupled to the rotating body, and the elastic pin which is retracted inward by pressing on the side surface of the insert body. A rotating jig provided with is prepared. Then, an insert nut having the other end surface and one end surface, the engaging notch portion provided on at least one end surface in the axial direction, and the tapping screw portion provided on the outer peripheral surface thereof is prepared. And insert the insert into the inside of the insert nut to engage the elastic pin with its inner threaded portion, and further connect the rotary jig to the insert nut by engaging the protrusion with the engaging notch, Next, the insert nut is embedded in the plastic by rotating the rotating body while pressing the other end surface of the insert nut against the embedded portion of the plastic. In a preferred embodiment of the method for embedding the insert nut, the rotating jig is detachably connected to the connecting portion of the electric tool.

[0005]

In order to connect the insert nut of the present invention to the rotary jig, the protrusion of the rotary jig is engaged with the engaging notch on one end face of the insert nut, and the insert of the rotary jig is inserted into the insert nut. To do. At the time of insertion, the tip of the elastic pin provided on the side surface of the insert body comes into contact with the inner threaded portion of the insert nut, is retracted inward from the side surface of the insert body at the crest portion, and protrudes from the side surface at the trough portion. Then, the insert body is inserted to a predetermined depth inside the insert nut, and the connection between the insert nut and the rotating jig is completed in a state where the tip of the elastic pin engages with the valley portion. The engagement of the tip of the elastic pin with the valley prevents the insert nut from dropping from the rotating jig, and the engagement of the protrusion and the notch for engagement allows the rotation of the rotating body of the rotating jig to the insert nut. Transmitted.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an example of an insert nut of the present invention and a rotary jig to which the insert nut is connected,
FIG. 2 is a side view of the main part. In these drawings, a cylindrical insert nut 1 has the other end surface 2 and one end surface 3, a tapping screw portion 4 is provided on the outer peripheral surface thereof, and an inner screw portion 5 is provided on the inner peripheral surface thereof. Further, a pair of engagement notches 9 are provided on the diagonal line of the one end face 3. The engaging notch 9 has a contact surface 9a parallel to the axis on the tip side in the screw rotation direction of the tapping screw portion 4, that is, the right rotation direction, and an inclined surface 9b on the rear end side. The middle portion thereof is a bottom surface 9c perpendicular to the axis.
A pair of notches 10 having a predetermined depth from the other end surface 2 in the axial direction are provided. The notch 10 serves as a cutting blade and a cutting scrap intake portion when the plastic is cut at the other end surface 2, and is provided to more efficiently perform the embedding action particularly when the hardness of the plastic is high.

The rotating jig 20 is a connecting portion 31 of the electric tool 30.
Removably connected to. The elastic pin 32 is provided in the connecting portion 31.
Is provided, and the rotary jig 20 is attached and detached while the elastic pin 32 is pushed in. (Note that such an attachment / detachment mechanism is well known in the art, and detailed description thereof will be omitted.) The rotating jig 20 includes a rotating body 21 having a circular cross-section provided with a pair of protrusions 22, and a coaxial body to the rotating body 21. Has an insert 23 of circular cross-section which is joined together and extends axially from it. The rotary body 21 is provided with a flat bottom surface 21a, and the bottom surface 21a functions as a stopper that limits the insertion depth when the insert body 23 is inserted into the insert nut 1 as described later. A pair of protrusions 22 provided on the insert body 23
Has an abutment surface 22a, an inclined surface 22b and a bottom surface 22c which are parallel to the axial direction, and is dimensioned to be inserted into each engagement notch 9 in the insert nut 1.

A resilient pin 24 is provided on the side surface of the insert body 23 so as to project in the radial direction therefrom. As shown in FIG. 2, the elastic pin 24 is composed of a compression spring 24a housed in an elongated hole 25 provided in the insert 23 and a ball 24b arranged in contact with the other end surface. The ball 24b is sized so that a part of the ball 24b can be engaged with the valley of the inner screw portion 5 of the insert nut 1. Further, in order to prevent the ball 24b from protruding from the hole 25, a rubber is provided on the peripheral edge of the hole 25. A stopper (not shown) such as a ring is fitted.

Next, the insert nut 1 is attached to the rotary jig 2
A method of connecting to 0 will be described. First, as shown by the arrow in FIG. 2, the one end face 3 of the insert nut 1 is brought closer to the rotary jig 20 from below, and the engaging notch 9 is engaged with the projection 22 of the rotary body 21 of the rotary jig 20. At this time, the insert nut 1 can be easily engaged by rotating the insert nut 1 in the clockwise direction while contacting the inclined surface 9b of the engaging cutout portion 9 with the inclined surface 22b of the protrusion 22. On the other hand, in the process of engaging as described above, the insert body 23 is inserted into the insert nut 1 and provided on the side surface thereof until the bottom surface 21a of the rotating body 21 contacts the upper surface of the one end face 3 of the insert nut 1. The elastic pin 24 is engaged with the inner screw portion 5 of the insert nut 1. FIG. 3 shows a state in which the insert nut 1 is connected to the rotary jig 20, and further, the engagement portion of the elastic pin 24 surrounded by the alternate long and short dash line is enlarged and shown in FIG. By engaging the tip of the elastic pin 24 and the trough of the inner threaded portion 5 in this manner, it is possible to prevent the insert nut 1 from dropping spontaneously from the rotary jig 20. Further, the rotation of the rotating body 21 of the rotating jig 20 is caused by the engagement of the projection 22 and the engaging notch 9 with the insert nut 1.
Is transmitted to

FIG. 5 is a partial sectional view showing a state in which the insert nut 1 connected to the rotary jig 20 as described above is embedded in plastic. In this example, a boss 41 having a circular cross section provided in a plastic case 40 has a hole preliminarily formed therein, and the insert nut 1 is embedded in the hole. The other end surface 2 of the insert nut 1 is formed into a hole of the boss 41. By inserting and pressing, the rotating jig 20 is rotated in the arrow direction by the electric tool 30. As a result, the other end surface 2 bites into the inner peripheral surface of the hole, the hole is tapped by the tapping screw portion 4, and the insert nut 1 is embedded and fixed. After the burying is completed, the rotary jig 20 is detached from the insert nut 1 only by pulling the electric tool 30 upward as shown by the arrow.
In the above example, the rotating jig 20 is detachably connectable to the electric tool 30, but in some cases, the rotating jig 2
0 and the power tool 30 may be integrally connected. Further, the rotating jig 20 may be connected to a robot for automatically embedding an insert nut, which is installed during the manufacturing process of various production lines, for example.

[0011]

[Modification] In the above embodiment, the engaging notch 9 is provided on one end face in the axial direction of the insert nut 1, but it may be provided on both end faces. As a result, the insert nut 1 can be inserted and attached even when it is turned upside down. This has an advantage that when the embedding of the insert nut 1 is automated, the alignment of the insert nut 1 becomes easy.

[0012]

The insert nut of the present invention constructed as described above can be attached to or detached from the rotating jig with one touch by utilizing the engaging notch provided on one end surface thereof. It is possible to remarkably improve the productivity of embedding the insert nut in the mass production process as compared with the conventional one. Further, by providing the notch having a predetermined length in the axial direction from the other end surface of the insert nut, it is possible to more efficiently cut the plastic on the other end surface of the insert nut. According to the method of embedding the insert nut in the plastic using the insert nut of the present invention, the insert nut can be attached to or detached from the rotating jig with one touch as described above, and the elastic pin provided on the rotating jig can be used. This automatically prevents the insert nut from dropping from the rotating jig. Moreover, it is not necessary to add a special mechanism for holding the insert nut.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an insert nut of the present invention and a rotary jig to which the insert nut is connected.

FIG. 2 is a side view of a main part of FIG. 1;

FIG. 3 is a perspective view of the insert nut 1 shown in FIG.
The side view in the state connected to 0.

FIG. 4 is an enlarged view of a portion surrounded by a dashed line in FIG.

FIG. 5 is a partial cross-sectional view of a state in which an insert nut 1 connected to a rotating jig 20 is embedded in plastic.

FIG. 6 is a sectional view showing a mounting state of a conventional insert nut.

[Explanation of symbols]

 1 insert nut 2 other end face 3 one end face 4 tapping screw part 5 inner screw part 6 rotating jig 7 outer screw part 8 connecting part 9 engaging notch 9a abutting face 9b inclined face 9c bottom 10 notch 20 rotating jig 21 Rotating Body 21a Bottom Surface 22 Protrusion 22a Abutting Surface 22b Inclined Surface 22c Bottom Surface 23 Insert Body 24 Elastic Pin 24a Compression Spring 24b Ball 25 Hole 30 Electric Tool 31 Connecting Part 32 Elastic Pin 40 Plastic Case 41 Boss

Claims (5)

[Claims] 1. An inner threaded portion 5 is formed on the inner circumference, and
In the cylindrical insert nut 1 for embedding plastic in which the tapping screw portion 4 is provided on the outer peripheral surface, the protrusion 22 of the rotary jig 20 having the rotating body 21 provided with the protrusion 22 on the outer peripheral tip is attached and detached from the axial direction. An insert nut, wherein an engagement notch 9 that is freely engaged is provided on at least one end face 3 of the tubular axial direction. 2. The insert nut according to claim 1, further comprising a notch 10 having a predetermined length from the other end surface 2 in the axial direction. 3. An insert body (23) to be inserted into the inner screw part (5) of the insert nut (1) is provided at the center of the projecting body, and a projection 22 is provided at the tip of the outer periphery by retreating in a stepwise manner on the outer periphery thereof. Rotating jig 20 having rotating body 21 and elastic pin 24 provided on the side surface of insert body 23 so as to be retracted inside by pressing.
Further, a cylindrical insert nut 1 having an engaging notch 9 on at least one end face 3 in the axial direction and a tapping screw 4 on the outer peripheral surface is prepared, and the insert 23 is inserted into the insert nut 1 And the elastic pin 24 is engaged with the inner threaded portion 5 thereof, and the projection 22 is engaged with the engaging notch portion 9 to rotate the jig 2.
By connecting 0 to the insert nut 1 and rotating the rotating body 21 while pressing the other end surface 2 of the insert nut 1 against the embedded portion of the plastic,
A method for embedding an insert nut, wherein the insert nut 1 is embedded in a plastic. 4. A notch 10 having a predetermined length in the axial direction from the other end surface 2 of the insert nut 1 is provided.
How to bury the insert nut of. 5. The rotating jig 20 is a connecting portion 3 of an electric tool 30.
The method of embedding an insert nut according to claim 3 or 4, wherein the insert nut is removably coupled to 1.