JP2581565Y2 - Screw with guide roller - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw with a guide roller having a self-aligning function.

[0002]

2. Description of the Related Art Conventionally, as a screw with a guide roller in which a guide roller is rotatably retained in a screw body, there is, for example, a furniture roller described in Japanese Utility Model Publication No. 47-9974.

[0003] That is, the rotating rollers of the furniture are:
Flanges are formed on both sides of a center hole of a guide roller, which is a rolling element made of a synthetic resin, and the head of a mounting screw is rotatably fitted into the center hole, and both ends of the head are peripherally edged. Are received by the flange pieces, respectively.

[0004]

However, the center hole of the guide roller according to the prior art is loosely fitted to the outer peripheral surface of the mounting screw in order to be rotatable. For this reason, the guide roller is liable to rattle, and when an external force is applied to the outer peripheral surface of the guide roller to rotate the guide roller from a direction perpendicular to the axis of the mounting screw, the guide roller rotates while swinging in the axial direction, so that the guide roller rotates smoothly. However, there is a problem that a proper rotation cannot be obtained.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a screw with a guide roller having an automatic centering function in which the guide roller rotates without causing a runout in the axial direction.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a screw with a guide roller in which a guide roller is rotatably retained on a screw head side of a screw main body. , And an inclined surface including a self-aligning arc surface.

[0007]

According to the present invention, when an external force is applied to the outer peripheral surface of the guide roller from a direction perpendicular to the axis, a component of the external force is generated in the axial direction of the guide roller.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a screw with a guide roller according to the present invention will be described with reference to the accompanying drawings of FIGS. The screw with a guide roller according to the first embodiment is a screw body 1
0 and a guide roller 20, and the screw body 10 is provided with a lower neck body 13 between a screw head 11 and a screw portion 12, and a continuous guide is provided on the outer peripheral surface of the lower neck body 13. A groove 14 is provided.

The guide roller 20 has a center hole 21 rotatably and loosely fitted to the screw head 11 and the lower neck portion 13 of the screw body 10, and the guide hole is formed in the inner peripheral surface of the center hole 21. An annular ridge 22 that protrudes into the groove 14 is provided. Further, the guide roller 20 has an outer peripheral surface 23.
Is a self-alignable circular arc surface inclined toward the screw head 11 side.

Then, the screw body 10 is inserted into the center hole 21 of the guide roller 20, and the guide groove 14 is engaged with the ridge 22 to prevent the screw from coming off. Then, the washer 15 is press-fitted and fixed to complete the assembling work.

Next, for example, the screw portion 1 of the screw body 10
When 2 is screwed into a female screw portion provided on a vertical base material (not shown), the washer 15 is pressed against and fixed to the base material.

At this time, the guide roller 20 is rotatable, and the guide groove 14 and the ridge 22 are only in contact with each other, but not in pressure.

Next, a conveyed object (not shown) is placed and moved on the outer peripheral surface 23 of the guide roller 20 from a direction perpendicular to the axis of the screw main body 10, and is rotated while applying an external force to the outer peripheral surface 23. Then, a component force of the external force is generated in the axial direction of the screw main body 10 to urge the guide roller 20 toward the screw portion 12. For this reason, the ridge 22 of the guide roller 20 presses against the guide groove 14 of the screw body 10 to restrict the position to one side. As a result, the guide roller 20 is smoothly rotated by its self-centering function without causing a runout in the axial direction,
Performs a stable transport action. In particular, since the outer peripheral surface 23 of the guide roller 20 is a self-aligning arc surface, it can cope with various angles. For this reason, there is an advantage that it can flexibly cope with a change in the contact angle due to the weight of the conveyed object and a variation in the assembly accuracy, and can smoothly rotate.

In this embodiment, since the mounting base of the guide roller 20 is wider than the outer peripheral surface 23, the contact pressure per unit area of the guide roller 20 with respect to the screw main body 10 is reduced, and the guide roller 20 is further reduced. There is an advantage that it rotates more smoothly.

In the first embodiment, the case where the outer peripheral surface 23 of the guide roller 20 is formed by an inclined arc surface has been described. However, the present invention is not limited to this.
May be composed of a self-aligning arc surface and a cylindrical surface as in the second embodiment shown in FIG. Further, as in the third embodiment shown in FIG. 5, it may be formed of a part of a circular arc surface which can be self-centered right and left. However, in the case of the second and third embodiments, in order to generate an urging force in the axial direction, the transferred object is arranged on a part of the arc surface of the outer peripheral surface 23 that can be automatically aligned. There is a need to. The other parts are the same as those in the first embodiment, and the description is omitted.

In the above embodiment, the guide roller 2
Although the case where the protrusion is provided on the 0 has been described, the screw body 1
0, while a central hole 21 of the guide roller 20 is provided.
May be provided with a guide groove on the inner peripheral surface. Also, screw head 1
Needless to say, the shape of 1 is not limited to the above-described embodiment.

[0017]

As is apparent from the above description, the screw with the guide roller according to the present invention has a slope on the outer peripheral surface of the guide roller, so that the screw with the guide roller extends from the direction perpendicular to the axis to the outer peripheral surface of the guide roller. When an external force is applied, a component force of the external force is generated in the axial direction. For this reason, the guide roller is urged to one side to regulate the position. As a result, the guide roller rotates without causing a runout in the axial direction, and can smoothly transport the transported object. In particular, since the outer peripheral surface is an inclined surface including a self-aligning arc surface, it can cope with various angles. For this reason, it is possible to flexibly cope with a change in the contact angle due to the weight of the conveyed object and a variation in the assembling accuracy, so that the conveyed object can be more smoothly rotated and conveyed. As a result, even if the accuracy of assembling the conveyed object is low, smooth rotation can be ensured by the screw with the guide roller according to the present invention, and there is an effect that the production management of the conveyed object becomes easy.

[Brief description of the drawings]

FIG. 1 shows a first example of a screw with a guide roller according to the present invention.
It is a front sectional view showing an example.

FIG. 2 shows a first example of a screw with a guide roller according to the present invention.
It is a left view which shows an Example.

FIG. 3 shows a first example of the guide roller screw according to the present invention.
It is a principal part expanded sectional view which shows an Example.

FIG. 4 shows a second example of the guide roller screw according to the present invention.
It is a principal part expanded sectional view which shows an Example.

FIG. 5 shows a third example of the guide roller screw according to the present invention.
It is a principal part expanded sectional view which shows an Example.

[Description of Signs] 10: Screw body, 11: Screw head, 13: Lower neck body, 14
... Guide groove, 20 ... Guide roller, 21 ... Center hole, 2
2 ... ridge, 23 ... outer peripheral surface.

Claims (1)

(57) [Scope of request for utility model registration] 1. A screw with a guide roller in which a guide roller is rotatably retained on a screw head side of a screw body, wherein an outer peripheral surface of the guide roller is an inclined surface including a self-aligning arc surface. A screw with a guide roller.