JPH08145031A - Split nut and manufacture thereof - Google Patents

Abstract

PURPOSE: To provide a split nut which can be easily manufactured with a high degree of accuracy without requirement of time and labor and which can facilitate the attachment and removal of the split nut onto and from a bolt. CONSTITUTION: Inner thread parts 14 are formed in the inner peripheral parts of a plurality of segment pieces 12b. An engaging pawl 16 is formed in the segment pieces 12b, and an engaging recess 17 adapted to be engaged therein with the engaging pawl 16 is formed in the other segment pieces 12a. The engaging pawl 16 is fitted in the engaging recess 17 after being guided by a guide surface 26 by pressing the segment pieces 12a, 12b against each other, and accordingly, it is prevented from coming off from a bolt 18. Further, when the split nut 11 is removed from the bolt 18, the engaging pawl 16 is displaced away from the engaging recess 17 so that the segment pieces 12a, 12b are separated from each other. In this condition, the split nut 11 can be pulled off from the bolt 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split nut which is divided at least partially in the circumferential direction so as to be attached to an intermediate position in the axial direction of a long bolt, and a method for manufacturing the split nut.

[0002]

2. Description of the Related Art FIG. 13 is a perspective view showing a typical prior art split nut 1, which is disclosed, for example, in Japanese Utility Model Laid-Open No. 2-117416. In this prior art, one end of each of the two divided pieces 2a and 2b is connected by a hinge pin 3 so as to be angularly displaceable to each other.
Pin holes 4a and 4b are formed at the other ends of a and 2b, respectively, to form a split nut 1 in which the split pieces 2a and 2b are connected in a substantially C shape. Inner threads 6a and 6b are engraved on the inner peripheral portion of each of the divided pieces 2a and 2b so that the threads are continuous. After mounting the split nut 1 at an intermediate position of a long bolt to be screwed, the split nuts 2a and 2b are attached.
Is closed by angularly displacing each of the pin holes 4a and 4b in a direction in which they are close to each other so as to overlap each other on one axis.
A lock pin 5 is inserted into each of the pin holes 4a and 4b communicating with each other on one axis to connect the divided pieces 2a and 2b in an annular shape so that they can be engaged with the bolt.

[0003]

In such a prior art, the split nut 1 is composed of the split pieces 2a and 2b, the hinge pin 3 and the lock pin 5, and the split pieces 2a and 2b and the hinge pin 3 are provided. And lock pin 5
Have different shapes and must be manufactured individually. In addition, each of the divided pieces 2a and 2b must be connected by the hinge pin 3, and after the divided pieces 2a and 2b and the hinge pin 3 are manufactured, assembly work is required. Moreover,
With the split nut 1 attached to the bolt and the lock pin 5 inserted in each of the pin holes 4a and 4b, the split nut 1 must be smoothly rotated to be tightened or loosened. The position where the hinge pin 3 is inserted into each of the divided pieces 2a and 2b, the position where the pin holes 4a and 4b are formed, and the like must be accurately positioned, which requires time and labor for processing. Further, in order to mount the split nut 1 on the bolt, the lock pin 5 is once pulled out from the pin holes 4a, 4b, the split pieces 2a, 2b are mounted on the bolt, and the lock pin 5 is mounted again on the pin hole 4a. , 4b, and the mounting work is troublesome. Especially, when a large number of split nuts 1 must be attached to or removed from the bolts, the pin holes 4a,
The work of inserting or removing 4b must be performed for all of the split nuts 1, which requires a long time and labor for mounting and removing work of the split nuts 1 on the bolts.

Therefore, an object of the present invention is to reduce the number of parts constituting the split nut, and to easily and highly accurately manufacture without requiring labor for processing, and to mount and remove the bolt. It is an object of the present invention to provide a split nut and a method for manufacturing the split nut that can quickly perform

[0005]

According to the present invention, a plurality of divided pieces are connected in a substantially C-shape by a connecting portion, and an inner thread is formed on an inner peripheral portion of the divided nut. An engaging claw is formed on a divided piece arranged at one end in the circumferential direction, and the engaging claw is engaged on a divided piece arranged at the other end in the circumferential direction of the plurality of divided pieces. The split nut is characterized in that a mating engagement recess is formed. Further, the connection portion of the present invention is characterized by being constituted by a spring made of spring steel. Further, according to the present invention, a rod-shaped body made of a thermoplastic resin having a polygonal cross section is cut in a direction perpendicular to the axis at predetermined intervals in the axial direction to form a plurality of strips. , A screw hole that is inserted through in the thickness direction on the central axis is formed, and each strip in which the screw hole is formed is cut from the screw hole to the outer peripheral surface, and the engaging claw and the engaging claw are Engagement recesses for engagement are formed, and notches that extend from the screw holes to the vicinity of the outer peripheral portion are formed in each of the strips in which the engagement claws and the engagement recesses are formed. It is a nut manufacturing method.

[0006]

According to the present invention, the split nut has a plurality of split pieces that are angularly displaceably connected to each other by the connecting portion,
Each segment is made of thermoplastic resin. Each of the divided pieces is formed into a substantially C-shape in a state of being connected by the connecting portion, and an inner thread engraved on an inner peripheral portion thereof that can be screwed into a bolt to which the divided nut is to be attached. It in this way,
An engaging claw is formed on the divided piece arranged at one end in the circumferential direction among the plurality of divided pieces connected in a substantially C shape. Also,
An engaging recess with which the engaging claw is engaged is formed in the split piece arranged at the other end in the circumferential direction among the plurality of split pieces connected in the substantially C shape.

Therefore, with the split nut mounted on the bolt, by tightening the split pieces arranged at the both ends in the circumferential direction in the direction in which they approach each other, the engagement claw is fitted in the engagement recess. It can be fitted in and locked, and in this way, the split nut can be attached to the bolt while being prevented from coming off. When the split nut is detached from the bolt, the engaging claws are detached from the engaging recesses to release the locked state of the split pieces at both ends in the circumferential direction, and The split nut can be pulled out of the bolt through the opening.

In such a split nut, since each split piece is made of a thermoplastic resin, the engaging pawl, the engaging recess and the connecting portion can be integrally formed, and therefore, in relation to the prior art. As described above, it is not necessary to individually manufacture the plurality of members, and the operation of assembling the plurality of members can be eliminated.

In order to engage the engaging claws with the engaging recesses, it suffices to press the divided pieces arranged at both ends in the circumferential direction in a direction in which they come close to each other. Is easy. Further, when removing the split nut attached to the bolt, the engaging claws can be removed from the engagement recesses, so that the split nut can be easily removed.

As described above, since it is possible to easily attach and remove the split nut to and from the bolt, it is necessary to insert or remove the lock pin into or from the pin hole as in the prior art. Therefore, the efficiency of the work of mounting and removing the bolt of the split nut is improved.

Further, as described above, since the plurality of divided pieces are made of the thermoplastic resin, it is possible to easily and highly accurately manufacture them without requiring labor for processing.

Further, according to the invention, the connecting portion is constituted by a spring made of spring steel, such as a leaf spring or a torsion spring. With such a spring, the divided pieces can be biased toward each other or away from each other. When the split pieces are configured to be spring-biased in the direction of approaching each other, the split nut does not need to be held by hand while being attached to the bolt so as not to fall, and therefore Since the hand holds the split nut, it is not restricted, and workability at the time of mounting can be improved. In addition, when the springs are configured to urge each of the split pieces in a direction in which they are separated from each other, when the split nut is removed from the bolt, a large force is applied in a direction in which the split pieces are separated from each other. It is not necessary to open it, and the split nut can be easily removed from the bolt. Furthermore, by using a spring that stabilizes at a position where the gap between the split pieces arranged at both ends in the circumferential direction of the spring is slightly smaller than the outer diameter of the bolt, the split nut is attached to the bolt. The split nut can be prevented from falling off the bolt, and
When the split nut is removed from the bolt, it can be easily pulled out through the gaps between the split pieces arranged at both ends in the circumferential direction.

Further, by forming the connecting portion by the spring, the divided pieces can be connected with great strength. As a result, even if the split nut is attached to and removed from the bolt many times,
It is possible to prevent cracks or elongation from occurring in the connecting portion, and this can greatly improve the durability of the split nut.

Further, according to the present invention, a rod-shaped body made of a thermoplastic resin having a polygonal cross section is cut in the axial direction at a constant interval to form a plurality of strips, and a screw is formed at the center of the strips. After the hole is formed, the engaging claw and the engaging recess are formed, and the notch is formed at a position different from the engaging claw and the engaging recess to manufacture the split nut.

Therefore, it is not necessary to individually manufacture a plurality of members having different shapes that form the split nut, and it is not necessary to assemble a plurality of members having different shapes, thereby significantly simplifying the manufacturing process of the split nut. Productivity can be improved.

Further, an engaging claw and an engaging recess are formed in each strip by cutting from the screw hole to the outer peripheral surface. Therefore, it is not necessary to separately form these engaging claws and engaging recesses, and at the same time, the engaging claws and the engaging recesses are accurately formed in correspondence with each other so that they are in close engagement with each other. can do. As a result, the labor required for processing is greatly simplified and productivity is improved.

[0017]

1 is a perspective view showing a split nut 11 according to an embodiment of the present invention, and FIG. 2 is a plan view of the split nut 11. The split nut 11 of the present embodiment is configured by connecting a plurality of (two in the present embodiment) split pieces 12a, 12b in a substantially C-shape by a connecting portion 13. Each divided piece 12a, 12
b is angularly displaceable with respect to the connecting portion 13 in the directions of arrows A1 and A2, and inner thread portions 15a and 15b forming the inner thread 14 are engraved on the inner peripheral portion thereof, respectively.
The inner threaded portions 15a, 15b are respectively formed by the divided pieces 12a, 12
In the state where b is connected, the threads are formed so as to continue spirally.

Of the plurality of divided pieces 12a, 12b,
An engaging claw 16 is formed on one of the divided pieces 12b arranged at one end in the circumferential direction, and the plurality of divided pieces 12a,
Of the 12b, the divided piece 12a arranged at the other end in the circumferential direction.
An engaging recess 17 with which the engaging claw 16 is engaged is formed in the.

Such a split nut 11 is mounted at an intermediate position of a bolt 18 which is long in the axial direction, and each split piece 12 is attached.
By pressing a and 12b in the direction A2 in which they approach each other, the engaging claw 16 is fitted into the engaging recess 17, and the outer screw 19 engraved on the outer peripheral surface of the bolt 18 is inserted into the inner screw 14 Can be screwed together.

The sectional shape of the split nut 11 of this embodiment is as follows.
An internal angle θ formed by the six flat side surfaces 21a to 21f which are regular hexagons and which form the outer peripheral surface 20 is 120 degrees. The ridge lines 22a to 22f at which the side surfaces 21a to 21f intersect the other side surfaces adjacent to each other in the circumferential direction are parallel to the central axis line 23, and the engagement claw 16 formed on the one divided piece 12b has the central axis line. It is formed so as to project to the side of the other divided piece 12a beyond a radius line 24 connecting 23 and one ridge line 22f. Therefore, the engagement recess 17 with which the engagement claw 16 engages is formed in the other divided piece 12a.

Each of the divided pieces 12a also includes a divided piece 12a.
When the a and 12a are pressed in the direction A2 in which they approach each other, in order to smoothly guide the engagement claw 16 into the engagement recess 17, the engagement piece 17 is positioned closer to the one divided piece 12b side than the engagement recess 17. The protruding portion 25 is formed with an outwardly convex guide surface 26 that bends toward the engagement recess 17 as it extends radially outward. By such a guide surface 26, each divided piece 12
When a and 12b are pressed in the direction A2 in which they are close to each other, the engaging claw 16 is guided radially outward by the guide surface 26 and is deformed radially outward, and the tip 27 thereof is engaged with the engaging recess. When facing 17, the engaging claw 16 is returned inward in the radial direction due to its elastic recovery force. In this way, the engaging claw 16 can be guided and engaged in the engaging recess 17.

Further, in the present embodiment, the connecting portion 13 is integrally formed of the same material as each of the divided pieces 12a and 12b. Examples of this material include acrylic-nitrile-butadiene-styrene resin (abbreviation ABS resin), polyamide resin (trade name nylon), polyacetal resin, polycarbonate resin, polypropylene resin, polyphenylene oxide resin, and polyester resin (abbreviation FRB). A thermoplastic resin can be used. In particular, since the polyamide resin can be dyed, it is possible to color-code it according to the use and size of the split nut 11 and the mounting position. Further, the remaining resin, that is, the ABS resin, the polyacetal resin, the polycarbonate resin, the polypropylene resin, the polyphenylene oxide resin, and the polyester resin can also be color-coated by applying a paint to the entire outer surface or the outer peripheral surface 20.

As described above, by color-dividing the split nuts 11, it is possible to easily identify the split nuts 11 having different sizes depending on the colors, for example, according to the nominal diameter of the bolt 18 to be mounted.

FIG. 3 is a sectional view showing a usage state of the split nut 11 shown in FIGS. 1 and 2. For example, in order to support the ceiling plate 30, a bolt 18 called an axially long hanging bolt that hangs downward from the lower surface of the concrete slab of the building has two split nuts 1
The bracket 31 is fixed at a predetermined height by 1.
The bracket 31 includes a flange portion 32 which is sandwiched by the two split nuts 11 and through which the bolt 18 is inserted,
A falling portion 33 that bends from one side portion of the flange portion 32 at a substantially right angle and falls, and a horizontal portion that extends from the lower end portion of the falling portion 33 to the opposite side of the flange portion 32 at a substantially right angle and extends horizontally. 34 and a rising portion 35 which is bent upward from the free end portion of the horizontal portion 34 at a substantially right angle and rises.

The bracket 31 is a shape member made of, for example, an aluminum alloy. Such a bracket 3
1 is also called a hanger and supports a field receiver 36.
A plurality of field edges 37, which are orthogonal to the longitudinal direction of the field edge receiver 36, are fixed at intervals in the vertical direction on the paper surface of FIG. The field edge receiver 36 and the field edge 37 are realized by channel steel having a C-shaped cross section perpendicular to the axis. The ceiling plate 30 is fixed to the field edge 37 using a tapping screw or the like. The ceiling plate 30 is realized by a finishing material such as a gypsum board.

As described above, in connection with the structure for attaching the ceiling plate 30, the split nut 11 is attached to the long bolt 18
On both sides of the flange portion at the middle position of the
It can be easily mounted from the side via the gap 38 (see FIG. 1) between a and 12b. Therefore, the bolt 18
Compared to the case where a conventional nut is attached from the lower end of the and tightened while rotating, the installation work is much easier.
Working time can be shortened. Moreover, with each split nut 11 attached to the bolt 18, each split piece 12
By pressing a and 12b in the direction A2 in which they approach each other, the engaging claw 16 fits into the engaging recess 17 and can easily be prevented from coming off.

In this way, the plurality of side faces 21a to 2a with the split nuts 11 attached to the bolts 18 are formed.
Of 1f, a pair of side surfaces parallel to each other, for example, side surface 2
A tightening tool such as a wrench is engaged with 1a and 21d to tighten, and the bracket 31 is accurately positioned and fixed in the vertical direction together with the field edge receiver 36 and the field edge 37 so that the ceiling plate 30 becomes horizontal. It becomes possible.

FIG. 4 is a flow chart for explaining the procedure for manufacturing the split nut 11, and FIG. 5 is a flowchart for explaining the split nut 11.
FIG. 6 is a simplified diagram showing a manufacturing procedure of.

In step n1, the manufacturing operation of the split nut 11 is started, and as shown in FIG. 5A, a solid rod-shaped body 38 having a regular hexagonal cross section is prepared. The axial length L of the rod-shaped body 38 is, for example, 20 to 20.
It is 100 cm, preferably 30 cm. When the length L of the rod-shaped body 38 in the axial direction is about 30 cm, it is easy to transport and stack the boxes, and it is less likely to be cut accidentally and convenient to handle.

Such a rod-shaped body 38 can be manufactured by an extrusion molding device 39 as shown in FIG. This extrusion molding device 39 is provided with a main body 40, a cylinder 41 provided on the upper portion of the main body 40, a die 42 attached to the tip end portion of the cylinder 41, and a base end portion of the cylinder 41. And a hopper 43 for accommodating the resin particles.

Inside the cylinder 41, there is provided a screw 44 for conveying the raw material supplied from the hopper 43 toward the die 42, and around the screw 44, for heating and melting the material supplied from the hopper 43. A plurality of heaters 45 are provided. The material that is fluidly heated by the heater 45 is extruded from a nozzle hole having a regular hexagonal cross section of the die 42 and hardened as it is gradually cooled at room temperature, as shown in FIG. The rod-shaped body 38 is formed.

Next, at step n2, the above-mentioned rod-shaped body 38 is axially displaced by a constant distance ΔL, for example, ΔL =
It is continuously cut by a cutting machine at 1.0 cm, and FIG.
As shown in (2), a plurality of strips 47 are formed. After that, in step n3, as shown in FIG. 5 (3), by using a drilling device such as a drill in the center of each strip 47,
An insertion hole 48 is formed, and a tap (not shown) is inserted into the insertion hole 48 to engrave the inner screw 14, and the screw hole 4
9 is formed.

After that, in step n4, the engaging claw 16 and the engaging recess 17 are formed at the same time, and the guide surface 26 is formed by cutting the thread from the screw hole 49 to the outer peripheral surface 20 with a thread saw or the like. . Next, step n5
Then, as shown in FIG. 5 (5), the notch 50 is formed from the screw hole 49 to the vicinity of the ridge line 22c which is near the outer peripheral portion, for example, by punching. The thin portion 52 is formed by forming such a notch 50, and the divided pieces 12a and 12b are close to each other in the direction A2.
Further, the opening / closing operation can be easily performed in the separating direction A1.

As described above, since the split nut 11 can be formed only by cutting without assembling work, the time and labor required for machining can be reduced and the productivity can be improved. Further, since the split nut 11 is made of thermoplastic resin, it is lightweight and easy to carry.

FIG. 7 is a plan view showing a split nut 11a according to another embodiment of the present invention. The parts corresponding to those in the above-described embodiment are designated by the same reference numerals. The split nut 11a of this embodiment is composed of two split pieces 12a and 12b,
Each of the divided pieces 12 a and 12 b is formed in plane symmetry with respect to the axis 23. Each of the divided pieces 12a and 12b has the engaging claw 1
6, the engagement recess 17, the guide surface 26 and the notch 50 are respectively formed. With such a configuration, both of the divided pieces 12a and 12b can have a common cross-sectional shape, and thus the number of parts can be one.
The configuration is simplified. The respective engaging claws 16 of the respective divided pieces 12a and 12b are fitted into the corresponding engaging recesses 17 to engage with each other. In this case, the engaging recess 1 of the engaging claw 16
If the force of fitting into 7 is weak, the notch 50 may not be formed.

Further, as another embodiment of the present invention, as shown in FIG. 8, a split nut 11b constituted by three split pieces 12a, 12b, 12c having two notches 51a, 51b is used. You may do it. The parts corresponding to those in the above-mentioned embodiment are designated by the same reference numerals. By forming the two notches 51a and 51b in this manner, the divided pieces 12a and 12b on both sides of the central divided piece 12c are easily opened in the arrow A1 direction and are easily closed in the arrow A2 direction. It requires less force to open and close.

FIG. 9 is a perspective view showing a split nut 11c of still another embodiment of the present invention, and FIG. 10 is a plan view of the split nut 11c of the embodiment shown in FIG. The parts corresponding to those in the above-described embodiment are designated by the same reference numerals.
In this embodiment, it should be noted that the connecting portion 13 is
It is realized by the leaf spring 53. The leaf spring 53 is made of spring steel. Both end portions in the longitudinal direction of the leaf spring 53 are embedded in the divided pieces 12a and 12b, and the divided pieces 12a and 12b are formed.
Part of it is exposed to the outside. Such a leaf spring 53 extends in parallel along each side surface 21c, 21d,
As shown in FIG. 11, it is formed in a so-called “F” shape. The split nut 11c may be manufactured by a die molding in which the leaf spring 53 is installed in advance in the die and a thermoplastic resin is poured into the die to form the split nut 11c. In addition, each of the divided pieces 12a, 12b is formed with a recess into which both ends of the leaf spring 53 in the longitudinal direction can be fitted, and an adhesive is poured into each recess in advance, and the recess is put in each recess. You may make it fix by inserting both end parts of the leaf spring 53 in the longitudinal direction. The leaf spring 53 is provided with the engaging claw 16 when the divided pieces 12a and 12b are provided so that a spring force is generated in a direction in which the divided pieces 12a and 12b are separated from each other in the arrow A1 direction.
When the engagement state with the engagement recess 17 is released, the divided pieces 12a and 12b automatically open by the spring force of the plate spring 53, so to speak, and the bolt 18 easily divides the divided nut 11c.
Can be removed. Further, when the leaf spring 53 is provided so as to generate a spring force in a direction in which the divided pieces 12a and 12b are close to each other in the arrow A2 direction, the divided piece 11 is formed.
With the bolt 18 attached to c, the engaging claws 16 can be fitted into the engaging recesses 17 by pressing the divided pieces 12a, 12b in the approach direction A2 with a slight force.
Easy to install. Further, when using a spring that stabilizes the leaf spring 53 at a position where the gap between the divided pieces 12a and 12b is slightly smaller than the outer diameter of the bolt 18, the divided nut 11c is attached to the bolt 18, or At the time of removal, the split pieces 12a, 12b can be separated from each other in the arrow A1 direction or moved close to each other in the arrow A2 direction with a slight force, so that the split nut 11c can be easily attached to and removed from the bolt 18. be able to. Moreover, even if the divided pieces 12a, 12b are frequently opened and closed, the leaf spring 53 forms a connecting portion with great strength. Therefore, even if the divided pieces 12a, 12b are opened and closed frequently, cracks are caused by fatigue. It is possible to realize a split nut having high durability without the risk of occurrence of stretch or elongation.

As yet another embodiment of the present invention, the leaf spring 53 may be replaced by one or a plurality of torsion springs 54 as shown in FIG. Also in this case, the same effect as that of the split nut 11c including the leaf spring 53 described above can be achieved.

[0039]

As described above, according to the present invention, among the plurality of divided pieces connected in a substantially C shape, the engaging piece is formed on the divided piece arranged at one end in the circumferential direction. An engaging recess with which the engaging claw is engaged is formed in the split piece arranged at the other end in the circumferential direction among the plurality of split pieces connected in the substantially C shape. Therefore, when the split nuts are attached to the bolts, the split claws arranged at both ends in the circumferential direction are tightened in directions close to each other so that the engagement claws are fitted in the engagement recesses. Locked in this way,
The split nut can be easily attached to the bolt. When the split nut is removed from the bolt, the engaging claws are released from the engaging recesses to release the locked state of the split pieces at the both ends in the circumferential direction to form an opening. The split nut can be easily removed from the bolt through this opening. In this way, since it is possible to easily attach and remove the split nut to and from the bolt, it is not necessary to perform the complicated work of inserting or removing the lock pin into or from the pin hole as in the prior art. The efficiency of the work of installing and removing the bolt of the split nut is improved.

Further, since each divided piece is made of thermoplastic resin, it is possible to integrally form the plurality of divided pieces including the engaging claw, the engaging recess and the connecting portion, whereby the above-mentioned prior art is realized. As described in connection with (1), it is not necessary to individually manufacture the plurality of members, and the operation of assembling the plurality of members can be eliminated. Since the plurality of divided pieces are made of a thermoplastic resin, they can be manufactured easily and with high accuracy without requiring labor for processing.

Further, according to the present invention, the connecting portion is constituted by a spring made of spring steel. With such a spring, the divided pieces can be biased toward each other or away from each other. As a result, even if the split nut is attached to and removed from the bolt many times, it is possible to prevent cracks and elongation at the connection part, which greatly improves the durability of the split nut. Can be improved.

Further, according to the present invention, a rod-shaped body made of a thermoplastic resin having a polygonal cross section is cut at a constant interval in the axial direction to form a plurality of strips, and a screw is formed at the center of the strips. After the hole is formed, the engaging claw and the engaging recess are formed, and the notch is formed at a position different from the engaging claw and the engaging recess to manufacture the split nut. Therefore, it is not necessary to individually manufacture a plurality of members having different shapes that form the split nut, and thus it is not necessary to assemble a plurality of members having different shapes, and the manufacturing process of the split nut is significantly simplified to improve productivity. Can be improved. Further, an engaging claw and an engaging recess are formed in each strip by cutting the strip from the screw hole to the outer peripheral surface. Therefore, it is not necessary to separately form these engaging claws and engaging recesses, and at the same time, it is possible to accurately form the engaging claws and the engaging recesses so that they are closely engaged with each other. it can. As a result, the labor required for processing is greatly simplified and productivity is improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a split nut 11 according to an embodiment of the present invention.

FIG. 2 is a plan view of the split nut 11 of the embodiment shown in FIG.

FIG. 3 is a sectional view for explaining a usage state of the split nut 11 shown in FIGS. 1 and 2.

FIG. 4 is a flowchart for explaining a manufacturing procedure of the split nut 11.

FIG. 5 is a diagram showing a simplified manufacturing procedure of the split nut 11.

FIG. 6 is an extrusion molding apparatus 39 for manufacturing the rod-shaped body 38.
It is a front view which notches and shows partially.

FIG. 7 is a plan view showing a split nut 11a according to another embodiment of the present invention.

FIG. 8 is a split nut 11b according to still another embodiment of the present invention.
FIG.

FIG. 9 is a split nut 11c of yet another embodiment of the present invention.
FIG.

FIG. 10 is a plan view of the split nut 11c of the embodiment shown in FIG.

11 is a perspective view of a leaf spring 53 included in the split nut 11c of the embodiment shown in FIGS. 9 and 10. FIG.

FIG. 12 is a split nut 11 according to still another embodiment of the present invention.
It is a top view which shows the torsion spring 54 used for d.

FIG. 13 is a perspective view showing a typical prior art split nut 1.

[Explanation of symbols]

 11, 11a, 11b, 11c, 11d Split nut 12a, 12b Split piece 13 Connecting part 14 Inner screw 16 Engaging claw 17 Engaging recess 18 Bolt 20 Outer peripheral surface 25 Projection 26 Guide surface 38 Rod-shaped body 47 Strip 49 Thread Hole 50; 51a, 51b Notch 53 Leaf spring 54 Torsion spring

Claims (3)

[Claims] 1. A split nut in which a plurality of split pieces are connected to each other in a substantially C shape by a connecting portion, and an inner screw is formed on an inner peripheral portion, wherein the split nut is arranged at one end portion in the circumferential direction of the plurality of split pieces. An engaging claw is formed on the divided piece, and an engaging recess for engaging the engaging claw is formed on the divided piece arranged at the other end in the circumferential direction of the plurality of divided pieces. Split nut characterized by being. 2. The split nut according to claim 1, wherein the connecting portion is constituted by a spring made of spring steel. 3. A plurality of strips are formed by cutting a rod-shaped body made of a thermoplastic resin having a polygonal cross-section in a direction perpendicular to the axis at predetermined intervals in the axial direction of the rod. , A screw hole that is inserted in the thickness direction on the central axis is formed, and each strip in which the screw hole is formed is cut from the screw hole to the outer peripheral surface, and the engaging claw and the engaging claw are An engaging recess that engages is formed, and a notch that extends from the screw hole to the vicinity of the outer peripheral portion is formed in each strip in which the engaging claw and the engaging recess are formed. Nut manufacturing method.