JP3323128B2 - Screw device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screwing device having a screw function and a screwing function, for example, having a feeding function and a fastening function.

[0002]

2. Description of the Related Art Conventionally, in a screwing device composed of a screw shaft (bolt) and a screw (nut), at least one of the screw shaft and the screw is rotated to form the screw shaft. The screw body can be screwed from the screwing start side, and can be unscrewed by reverse rotation.

[0003] Such a screwing device is used in a state where it is not desired to completely unscrew the screwed body, such as a feed mechanism for rotating the screw shaft in the normal or reverse direction to move the screwed body in the normal or reverse direction. At the same time, there is a possibility that the screw may be unscrewed when the reverse rotation is performed excessively. Therefore, in order to prevent such screwing, after the screw body is screwed into the screw shaft body, a stopper of another component is provided at the screwing start side end of the screw shaft body.

[0004]

However, in the above-mentioned screwing device, when the screwed body is excessively rotated in the reverse direction, the screwed body bites into the stopper and the desired rotation cannot be performed smoothly. And such a situation occurs frequently. Also, when removing the screw body for repair inspection, etc., the stopper of another part must be removed beforehand, and this removal operation cannot be easily performed.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and it is possible to prevent the screwed body from being detached without using a separate part, and to easily detach the screwed body during repair inspection. It is to provide a screwing device.

[0006]

According to the present invention, there is provided a screwing device in which a slit is formed at an end of a screw shaft having a cavity, and a flexible portion having elasticity is formed by the slit. The flexible portion is provided with a stopper portion, and a thread portion of the threaded body is formed with a contact portion which can freely contact the stopper portion when the threaded body is unscrewed and rotated.

According to the present invention, the stopper is bent inwardly against the elasticity at the time of assembling the screw body into the screw shaft body by the above-mentioned structure, so that the stopper can be incorporated in exactly the same manner as the usual incorporation. After the screw body is assembled, the stopper portion is restored to the position of the stopper, and functions as a stopper when the screw body rotates in the reverse direction. In this way, the screw body can be prevented from being unscrewed without using a stopper of another part.
By simply forming a stopper on the screw shaft side, it can be easily performed with one part. Further, when it is desired to remove the screw body for repair inspection, etc., it can be easily performed by bending the flexible portion provided with the stopper portion against its elasticity.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention comprises a screw shaft and a screw body, and the screw shaft body is opened at least at a screw start end at a screw start end. At the end having the cavity, a slit including a portion substantially parallel to the screw groove and a portion substantially parallel to the shaft body axis and opened at the screwing start end is formed at the end having the cavity, and the slit is formed. A flexible portion having elasticity is formed by this, and a stopper portion for filling a screw groove is provided in the flexible portion, and a contact portion which is capable of abutting on the screw thread of the screw body when the screw body is unscrewed and rotated. It is a screwing device characterized by forming a portion.

According to the present invention, when the screw body is assembled to the screw shaft, when the end face of the screw thread comes into contact with the stopper, the flexible portion provided with the stopper bends inwardly against the elasticity. As a result, the screw thread advances while bending the stopper portion, and can be incorporated in exactly the same manner as in ordinary assembly. And when the screw thread has completely passed the stopper, the stopper
The elastic portion of the flexible portion returns to the stopper position, and therefore, when the assembled screw body is reversely rotated in the unscrewing direction, the contact portion which is moved earlier comes into contact with the stopper portion. Functions as a stopper. Further, when the screw body is detached for repair inspection, etc., it can be easily performed by bending the flexible portion provided with the stopper portion against its elasticity.

According to a second aspect of the present invention, there is provided the screwing device according to the first aspect, wherein the stopper is provided on a surface opposite to the slit from a bottom of the screw groove toward an upper end of the stopper. It is characterized by having an inclined surface.

According to this configuration, since the end face of the screw thread comes into contact with the inclined surface of the stopper portion, the bending of the flexible portion against the elasticity is performed gradually and smoothly. Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

1 to 3, the screwing device 1 includes a screw shaft 10 and a screwing body 20. The screw shaft body (bolt body) 10 is constituted by a cylindrical shaft body 11 so as to have a cavity 12 opened at both ends in the length direction, and a screw groove 13 is formed on the outer peripheral surface of the shaft body 11. Are formed.

A slit 14 is formed at the end of the screw shaft body 10 on the screwing start side, and the slit 14 is substantially parallel to the screw direction of the screw groove 13 and extends around 90 degrees. A direction portion 14A and an axial portion 14B substantially parallel to the shaft body axis 10a and opened at the screwing start end are included. That is, the slit 14 is formed in an L shape, and at that time, the circumferential portion 14A is formed so as to extend from the innermost portion of the axial portion 14B in the screwing rotation direction. And the end on the screwing start side by this slit 14
A flexible portion 15 having elasticity is formed.

In this flexible portion 15, an axial portion 14 substantially parallel to the shaft axis 10a of the slit 14 is provided.
At the end facing B, a stopper portion 16 that fills the screw groove 13 is provided. In the stopper portion 16, an inclined surface 17 from the bottom of the screw groove 13 to the upper end of the stopper portion 16 is formed on the surface of the slit 14 opposite to the surface facing the axial portion 14 </ b> B. .

A ring plate 18 is provided at the end of the shaft body 11 opposite to the end on the screwing start side. The screw shaft body 10 composed of the above 11 to 18 is integrally molded with a synthetic resin, and at that time, depending on the material of the synthetic resin,
The elasticity of the flexible portion 15 is automatically secured.

A screw body (nut body) 20 which can be screwed to the screw shaft body 10 can abut against the stopper portion 16 when the screw body 10 is unscrewed and rotated by the unthreaded end surface of the screw thread 21. The contact part 22 is formed. This screw 20
Are also integrally formed of a synthetic resin.

The operation of the screwing device 1 configured as described above, which is an example of the embodiment of the present invention, will be described. When assembling the screw body 20 to the screw shaft body 10 (at the time of screwing),
As shown by the solid line in FIG. 4, when the end face of the screw thread 21 comes into contact with the stopper portion 16, the flexible portion 15 provided with the stopper portion 16 has its elasticity as shown by the imaginary line in FIG. As a result, the screw thread 21 advances while deflecting the stopper portion 16, and can be assembled in exactly the same manner as in normal assembly. At this time, the end face of the screw thread 21 is
, The flexure against the elasticity of the flexible portion 15 is gradually and smoothly performed.

When the screw thread 21 has completely passed the stopper 16, that is, after the screw body 20 has been assembled, the stopper 16 returns to the stopper position by the elastic restoration of the flexible portion 15. Therefore, the assembled screw body 20 is rotated in the unscrewing direction (reverse rotation).
When this is done, as shown by the solid line in FIG. 5, the contact portion 22 that is moved ahead comes into contact with the stopper portion 16, and the stopper portion 16 functions as a stopper.

As described above, the screw body 20 can be easily prevented from being unscrewed by using one part, for example, by forming the stopper part 16 on the screw shaft body 10 side without using a stopper of another part. When detaching the screw body 20 for repair inspection, etc., the flexible portion 15 provided with the stopper 16 is provided.
Can be easily performed by bending the elastic member against its elasticity.

Next, an example of an embodiment using the screwing device of the present invention will be described with reference to FIG. Screw shaft 10
Is rotatably supported on the fixed shaft 24 by fitting the shaft main body 11 to the fixed shaft 24. A passive gear 25 is fixed to the ring plate 18, and the screw shaft 10 is configured to be rotatable in the forward and reverse directions by receiving a rotational force from the outside. One end of the anti-rotation lever 26 is provided with a pin 2 on the screw body 20 having a slightly different outer shape depending on the purpose of use.
The other end of the lever 26 is swingably connected to a fixing pin 29 through an elongated hole 28.

According to this usage example, the passive gear 25 is rotated in the forward and reverse directions by receiving the rotational force from the outside, so that the screw shaft body 10 integrated with the passive gear 25 is rotated forward with respect to the fixed shaft 24. It is rotated in reverse. As a result, the screw body 20, which is prevented from rotating by the lever 26, is moved forward and backward.

In the embodiment described above, the worm type having a large thread pitch is shown as the screwing device, but it may be a bolt / nut type having a small thread pitch.

In the above embodiment, the screw shaft 10
Is configured to have a cavity 12 opened at both ends in the length direction by a cylindrical shaft body 11, but this is formed only in the end on the screwing start side in a concave shape opened at the screwing start end. May be configured so as to have a cavity.

In the above embodiment, the screw shaft body 10 and the screw body 20 are integrally formed of a synthetic resin.
Either one or both may be formed of metal.

[0025]

The screwing device according to the present invention comprises a screw shaft and a screw, and the screw shaft has a cavity opened at the screwing start end at least in the end on the screwing start side. A slit including a portion substantially parallel to the screw groove and a portion substantially parallel to the axis of the shaft body and opened at the screwing start end is formed in the end having the cavity, and the slit has elasticity. Forming a portion, and providing a stopper portion for filling the screw groove in the flexible portion, and forming a contact portion which can be in contact with the stopper portion at the time of screwing-off rotation of the screw body on the screw thread of the screw body. Incorporation of the screw body into the screw shaft can be performed in exactly the same manner as normal assembly, and the screw body can be prevented from being unscrewed by forming a stopper on the screw shaft side without using a separate stopper. Can be easily done with one part, Withdrawal of the worm coalescence for such et to repair inspections, by deflecting against a flexible element or elastic,
Easy to do.

[Brief description of the drawings]

FIG. 1 is a perspective view of a screwing device according to an embodiment of the present invention.

FIG. 2 is a partially cutaway front view of the screwing device according to the embodiment of the present invention.

FIG. 3 is a plan view of the screwing device according to the embodiment of the present invention.

FIG. 4 is a partially cutaway plan view of a main part when the screwing device according to the embodiment of the present invention is assembled.

FIG. 5 is a partially cutaway plan view of a main part of the screwing device according to the embodiment of the present invention when the stopper acts.

FIG. 6 is a partially cutaway perspective view showing one usage example of the screwing device according to the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 screwing device 10 screw shaft body 10a shaft body axis 11 shaft main body 12 cavity 13 screw groove 14 slit 14A circumferential portion 14B axial direction portion 15 flexible portion 16 stopper portion 17 inclined surface 20 screw body 21 screw mountain 22 hit Contact part 24 Fixed shaft 25 Passive gear 26 Lever

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takeshi Ota 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A 8-175794 (JP, A) JP-A 9- 229155 (JP, A) JP 6-56551 (JP, U) JP 6-56550 (JP, U) JP 60-85606 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) F16H 25/20-25/24 F16B 41/00

Claims (2)

(57) [Claims] 1. A screw shaft body and a screw body, wherein the screw shaft body has a cavity opened at a screwing start end at least in an end on a screwing start side, and an end having the hollow is provided with a screw. A slit including a portion substantially parallel to the groove and a portion substantially parallel to the axis of the shaft body and opened at the screwing start end is formed, and a flexible portion having elasticity is formed by the slit. A screwing device, wherein a stopper portion that fills a screw groove is provided in a portion, and a contact portion that can come into contact with the stopper portion when the screwing member is unscrewed and rotated is formed in a screw thread of the screwing member. 2. The screwing device according to claim 1, wherein the stopper portion has an inclined surface from the bottom of the screw groove toward the upper end of the stopper portion on a surface opposite to the slit.