TW201546377A - Attaching mechanism - Google Patents

Abstract

An attaching mechanism having screws with bolts or small screw but no nut may achieve the anti- loosening effect equivalent to the HARDLOCK (Japan registered trademark) nut. The attaching mechanism comprises a screw (3) and a frame (1) screwed by the screw (3). In a manner of continuous arrangement in the axial direction, the screw (3) comprises a screw head (31) and a screw stem (33) having the outer circumferential surface formed with male thread. The frame (1) comprises a screw hole (14) screwed by the screw stem (33) and an embedded hole (13) embedded by the screw head (31). The outer circumferential surface of the screw head (31) and the inner circumferential surface of the embedded hole (13) are taper surfaces, whose diameters are gradually enlarged from the screw stem (33) and the screw hole (14) toward the outer side of the axial direction, such that the axis (O) of the outer circumferential surface of screw head (31) is eccentric to the axis (P) of the screw stem (33). Thus, when the screw head (31) is engaged by contacting the embedded hole (13) in whole circumference, the screw stem (33) can be screwed in the state while its axis is eccentric to the axis of the screw hole (14).

Description

Installation structure

The present invention is an attachment structure in which a screw is attached to a member to be attached.

In the body portion (the member to be mounted), the mounting member is attached and fixed by bolts, and the bolt is prevented from being loosened by the structure of the bolt itself. The applicant of the present invention has developed the installation described in Patent Document 1 below. structure.

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Laid-Open Patent Publication No. 2004-324820

In the conventional mounting structure, a conical trapezoidal convex portion having a tapered outer peripheral surface is provided on the bottom surface of the bolt head of the bolt, and an eccentric taper convex portion is provided at the same time, and the bolt receiving portion faces the bolt head. The surface is provided with a concave portion for fitting the convex portion, the convex portion and the concave portion have a larger diameter than the screw shaft, and the inner circumferential surface of the concave portion is formed concentrically with the screw shaft; The outer peripheral surface of the portion has a slight amount of eccentricity to the screw shaft.

Further, the eccentric amount of the convex portion is formed to be substantially equal to the gap in which the insertion hole (10) of the bolt receiving portion and the screw shaft are fitted to each other; or the gap between the insertion hole and the screw shaft is larger. In this case, the inner circumferential surface of the insertion hole and the outer circumferential surface of the screw shaft are crimped in a part of the circumferential direction, and the outer circumferential surface of the convex portion and the inner circumferential surface of the concave portion are crimped on the opposite side thereof to cause a loosening effect. .

In the above prior art, since the screw shaft and the screw hole of the member to be mounted are not eccentric in the screw-lock state, it is difficult to carry out the quality management on the manufacturing surface in such a manner that a sufficient anti-loosening effect can be obtained. In other words, the HARDLOCK (Japanese registered trademark) nut which is sold by the applicant of the present invention can exert a strong anti-loosening action by eccentric fitting to eccentrically screw the screw portion, and the above-mentioned prior art insertion hole ( The inner peripheral surface of 10) is cylindrical, and the insertion hole and the screw shaft are freely movable relative to each other in the axial direction, so that the tapered convex portion and the concave portion are in contact with each other in the circumferential direction, and are opposite in diameter. The side can only be screwed into a small number of bolts at the point of contact of the insertion hole and the screw shaft, and the slight screwing action causes the wedge to act to prevent loosening, thus requiring quite strict dimensional management.

Therefore, an object of the present invention is to enable a screw having a bolt or a small screw or the like without using a nut. It has the same anti-loosening effect as the HARDLOCK nut.

The present invention has been made in order to achieve the above object.

That is, the mounting structure of the present invention is characterized in that it has a screw and a member to be attached which is screwed by the screw, and the screw is provided continuously in the axial direction, and includes a screw head and a peripheral surface formed with a male The threaded screw shaft includes: a screw hole that is screwed by the screw shaft; and an insertion hole that is fitted into the screw head; an outer circumferential surface of the screw head and an inner circumferential surface of the insertion hole; a tapered surface that gradually becomes larger in diameter from the screw shaft and the screw hole side toward the axial direction; the axial center of the outer peripheral surface of the screw head is eccentric with respect to the axial center of the screw shaft, or the insertion hole The axial center of the inner circumferential surface is eccentric with respect to the axial center of the screw hole, so that the screw head can be fitted to the insertion hole over the entire circumference, and the screw shaft axis can be opposite to the aforementioned The screw hole shaft center is eccentrically locked.

When the screw is gradually screwed into the screw hole by using the mounting structure of the present invention, since the screw head and the insertion hole are eccentric, the outer circumferential surface of the screw head and the inner circumferential surface of the insertion hole are partially contacted in the circumferential direction. If the screw is further screwed in, a gap will be generated between the screw head and the insertion hole on the opposite side of the contact portion, and a slight gap will be formed between the male screw of the screw shaft and the female screw of the screw hole, and the screw will have a side. Slightly tilted one side is screwed, the male thread of the screw shaft and the female thread of the screw hole in the process It will gradually become eccentric, and as it is screwed in, considerable radial stress will gradually accumulate on the screw shaft. Thereafter, in a state in which the screw head is completely fitted in the insertion hole, the screw shaft is screwed into the screw hole in an eccentric state, and a relatively large wedge force acts on the entire screw to exert a strong anti-loose effect. effect.

In the above-described mounting structure of the present invention, it is preferable that the axial length of the tapered surface is the same as or longer than the axial length of the screw hole. Thereby, a considerable force generated by eccentricity of the screw shaft with respect to the screw hole can be exerted by the tapered surface, and even if the dimensional accuracy of the tapered surface is small, the loosening action can be surely produced.

Further, it is preferable that the amount of eccentricity is substantially equal to the amount of play of the male screw of the screw shaft with respect to the female screw of the screw hole.

Further, the screw further includes a pivot portion that is integrally provided between the screw head and the screw shaft, and the rotating member is rotatably attached to the pivot portion. For example, the frame (glass frame) of the eyeglass is used as the above-mentioned member to be attached, and the temple of the eyeglass is used as the above-mentioned rotating member. By using the present invention as a mounting structure of the temple of the eyeglasses, it can be provided at low cost for installation. The glasses of the temples will not loosen the glasses.

According to the present invention, it is also possible to obtain the HARDLOCK screw in the mounting structure in which the screw is not used and the mounting is performed using only the screw. The cap has the same anti-loose effect.

1‧‧‧Frame (glasses frame)

2‧‧‧Mirror foot (rotating member)

3‧‧‧ screws

4‧‧‧1st collar

5‧‧‧2nd collar

6‧‧‧Installation holes

7‧‧‧Mounting holes

10‧‧‧ inserted through hole

11‧‧‧Support film

12‧‧‧Support film

13‧‧‧ embedded hole

14‧‧‧ screw holes

21‧‧‧ inserted through hole

31‧‧‧ screw head

32‧‧‧ pivot

33‧‧‧ screw shaft

34‧‧‧Tools and Engagement Department

P‧‧‧ Axis

O‧‧‧Axis

Fig. 1 is a view showing a state before a screw is screwed in a mounting structure according to an embodiment of the present invention, (a) is a plan view thereof, and (b) is a longitudinal sectional view thereof.

Fig. 2 is a longitudinal cross-sectional view showing a step of screwing a screw in the same mounting structure.

Fig. 3 is a longitudinal cross-sectional view showing a step of screwing a screw in the same mounting structure.

4 is a longitudinal cross-sectional view showing a state in which the screw locking step of the screw is completed in the same mounting structure.

Fig. 5 is a longitudinal sectional view showing a mounting structure according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 4 show a mounting structure (mounting device) according to an embodiment of the present invention. For example, the temple 2 (rotary member) is rotated with respect to the frame 1 (glass frame) (attached member) of the eyeglasses using the screw 3 A freely constructed structure.

The screw 3 is a pivot portion 32 in which the screw head 31 and the outer peripheral surface are cylindrical in the axial direction, and a screw shaft in which the outer peripheral surface is formed with a male screw. The portion 33 is continuously provided integrally, and the pivot portion 32 and the axis O of the screw shaft portion 33 are formed concentrically, and the axial center P of the screw head 31 is slightly eccentric with respect to the axial center O of the shaft portions 32, 33. . The outer diameter of the pivot portion 32 is formed to be substantially equal to or larger than the outer diameter of the screw shaft portion 33. The screw head 31 is formed in a conical trapezoidal shape whose diameter gradually decreases from the upper end to the side of the screw shaft 33, whereby the outer peripheral surface thereof becomes a tapered surface which gradually increases in diameter from the side of the screw shaft 33 to the outside in the axial direction. The angle of the taper surface is preferably about 5° to 15° with respect to the axis P, and more preferably 9° to 11°. Further, the difference between the upper end radius and the lower end radius of the outer peripheral surface of the screw head 31 is preferably larger than the above-described eccentric amount, whereby as shown in FIG. 2, the screw shaft 33 and the screw hole 14 are concentrically arranged. After the screw 3 is gradually screwed in, the lower end of the screw head 31 will smoothly enter the insertion hole 13. Further, the upper surface of the screw head 31 is provided with a tool engagement portion 34, and the engagement groove for the one-word screwdriver is shown in the illustrated example, but the engagement groove for the Phillips screwdriver may be used. The engaging recess of the hexagonal hand can also be used, or other suitable shapes are also possible.

The frame 1 is arranged to have a profile A pair of upper and lower support pieces 11, 12 of a shape are inserted between the support pieces 11, 12 at one end portion of the temple 2. The upper support piece 11 is provided with an insertion hole 13 that is fitted into the screw head 31. The inner circumferential surface of the insertion hole 13 is formed into a tapered surface that conforms to the outer circumferential surface of the screw head 31. The lower support piece 12 is provided with a screw hole 14 that is screwed by the screw shaft portion 33, and the screw hole 14 and the axial center of the insertion hole 13 are formed concentrically. The inner diameter of the female thread formed on the inner circumferential surface of the screw hole 14 and the outer diameter of the male thread of the screw shaft portion 33 are identical in design size, but have a slight clearance in the actual manufacturing, the male thread The outer diameter (radius) is smaller than the inner diameter (radius) of the female thread by a small amount of play. This amount of play is preferably equal to the above-mentioned eccentricity.

Further, it is preferable that the axial length of the tapered surface is equal to or longer than the axial length of the screw shaft portion 33, whereby the screw shaft can be fitted by the fitting force of the tapered surfaces. The force of the portion 33 that is eccentric with respect to the screw hole 14 is increased.

The width of the one end portion of the temple 2 is substantially equal to the width of the gap between the upper and lower support pieces 11, 12, and one end portion of the temple 2 is provided with a plug inserted through the screw shaft portion 33. The through hole 21 has an inner diameter of the insertion hole 21 and an outer diameter of the screw shaft portion 33 which are substantially equal. Further, the axial length of the screw shaft portion 33 and the gap width between the upper and lower support pieces 11, 12 are substantially equal.

The function of the above-described mounting structure will be described as follows. As shown in FIG. 1, one end portion of the temple 2 is inserted between the upper and lower support pieces 11, 12, and the screw shaft 33 of the screw 3 is inserted and inserted from the side of the insertion hole 13. In the hole 21 and the screw hole 14, when the screw 3 is gradually screwed in, the screw shaft 33 and the screw hole 14 are gradually concentrically locked at the beginning. When the screwing is continued, as shown in FIG. 2, a part of the circumferential direction of the eccentric side in the outer circumferential surface of the screw head 31 contacts the inner circumferential surface of the insertion hole 13. When the screwing is continued in this state, the screw shaft 33 can be allowed to tilt slightly by the play between the screw shaft 33 and the screw hole 14, and the screw 3 is screwed into the side while being slightly inclined, as shown in FIG. As shown, The lower end portion on the eccentric side in the outer peripheral surface of the screw head 31 and the upper end portion on the opposite side in the diametrical direction thereof are in contact with the inner peripheral surface of the fitting hole 13, and the screw shaft 33 is further suppressed. The slope. If the screw 3 is forcibly screwed in, as shown in FIG. 4, the outer peripheral surface of the screw head 31 and the inner peripheral surface of the insertion hole 13 are in contact with each other over the entire circumference, and the screw shaft 33 is slightly small with respect to the screw hole 14. The state of being screwed in the state of eccentricity.

In this locked state, as shown by the arrow in Fig. 4, on the screw shaft portion, the radial reaction force will act over the entire length, for the lower end portion of the screw head 31 in the eccentric direction and the opposite side thereof The upper end portion generates a considerable reaction force, and by these reaction forces, a large frictional resistance is generated, and the anti-loosening effect is surely exerted.

The present invention is not limited to the above embodiment, and can be appropriately designed and changed. For example, the screw head may be formed concentrically with the screw shaft and the insertion hole may be eccentric with respect to the screw hole. Further, as shown in FIG. 5, the mounted member 1 may include a main body portion provided with two attachment holes 6 and 7 facing each other in the axial direction, a first collar 4 provided with the insertion hole 13, and The second collar 5 having the screw holes 14 is provided. The first collar 4 can be mounted in one of the mounting holes 6, and the second collar 5 can be mounted in the other mounting hole 7. The inner faces of the two mounting holes 6, 7 can be formed into a cylindrical surface, even if the inner diameters thereof are different from each other. If the same diameter is used, the two mounting holes 6, 7 can be processed by a cutting tool such as a lathe or a drill. . The axially outer end portions of the respective collars 4, 5 are provided with flanges. Further, the inner faces of the mounting holes 6, 7 gradually become large diameters as they go outward in the axial direction. The tapered surface is also possible, and it does not matter if the above-mentioned flange is not present in this case. Each of the collars 4 and 5 may be rotatable with respect to the main body portion, but the illustrated example is attached to the main body portion so as to be rotatable around the shaft core. According to the embodiment shown in Fig. 5, the axial force can be applied to the screw shaft, and a further anti-loosening effect can be expected, and it can also be applied to the locking and fixing of a plurality of members. Further, the main body of the member to be attached 1 may be subjected to simple hole processing, and the screw hole 14 or the tapered surface 13 requiring high machining accuracy may be formed in the collars 4 and 5 which are smaller members.

1‧‧‧Frame (glasses frame)

2‧‧‧Mirror foot (rotating member)

3‧‧‧ screws

13‧‧‧ embedded hole

14‧‧‧ screw holes

21‧‧‧ inserted through hole

31‧‧‧ screw head

32‧‧‧ pivot

33‧‧‧ screw shaft

Claims (4)

A mounting structure having a screw (3) and a mounted member (1) screwed by the screw (3), the screw (3) being provided in a continuous manner in the axial direction, having: a screw head ( 31) and a screw shaft (33) having a male screw formed on the outer peripheral surface thereof, wherein the mounted member (1) includes a screw hole (14) that is screwed by the screw shaft (33), and the screw head ( 31) The embedded insertion hole (13), the outer circumferential surface of the screw head (31) and the inner circumferential surface of the insertion hole (13) are oriented from the screw shaft (33) and the screw hole (14) side a tapered surface that is gradually enlarged in the axial direction; the axis (O) of the outer peripheral surface of the screw head (31) is eccentric with respect to the axial center (P) of the screw shaft (33), or the insertion hole The axial center of the inner peripheral surface of (13) is eccentric with respect to the axial center of the screw hole (14) so that the screw head (31) is fitted into the insertion hole (13) over the entire circumference. In time, the axis of the screw shaft (33) can be screwed in a state of being eccentric with respect to the axial center of the screw hole (14). The mounting structure according to claim 1, wherein the axial length of the tapered surface is equal to or longer than the axial length of the screw hole (14). The mounting structure according to claim 1, wherein the eccentric amount is substantially equal to a play amount of a male screw of the screw shaft (33) with respect to a female screw of the screw hole (14). The mounting structure according to claim 1, wherein the aforementioned screw (3) Further, a pivot portion (32) integrally provided between the screw head (31) and the screw shaft (33) is provided, and the pivot portion (32) is rotatably mounted with a rotating member (2).