JPH062835Y2 - Fixed structure of outer mirror support pipe - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a structure for fixing one end of a pipe supporting an automobile outer mirror to a bracket installed on a vehicle body, such as a truck. It is suitable to be applied to.

[Conventional technology]

FIG. 4 is an external view showing a conventional example of this type of outer mirror support structure.

A clamp 2 is attached to the upper end of the pipe 1.
The clamp 2 is fixed by gripping the sash of the vehicle body.

On the other hand, the bracket 3 installed on the vehicle body is provided with a bottomed hole 3a, and the lower end portion of the pipe 1 is fitted therein.

The middle portion of the pipe 1 is substantially vertical, and the outside mirror 4 is attached to this vertical portion.

FIG. 5 is a perspective view showing a fitted state of the bracket 3 and the lower end portion of the pipe 1.

FIG. 6 shows the external appearance of this fitting portion as viewed in the direction of arrow VI shown in FIG.

A cross section taken along the line VIII-VIII of FIG. 6 is shown in FIG.

The lower end of the pipe 1 is inserted into the hole 3a of the bracket 3.

The pipe 1 is provided with a female screw hole 1a, and a mounting screw 5 inserted into a through hole 3b penetrating the side surface of the hole 3a of the bracket 3 is screwed into the female screw hole 1a.

A cross section taken along the line VIII-VIII of FIG. 7 is shown in FIG.

When the mounting screw 5 is tightened, the pipe 1 is pulled to the left side in the drawing, comes into line contact with the hole 3a of the bracket 3, and forms a gap g between the pipe 1 and the hole 3a.

[Problems to be solved by the device]

As described with reference to FIGS. 7 and 8, at the fitting portion of the pipe 1 and the hole 3a, the pipe 1 is in line contact with 3a along one line, and at other portions, there is a gap. Since g is generated, the mounting state of the pipe 1 is unstable.

That is, in FIG. 6, there is a problem that the pipe 1 easily swings around the mounting screw 5 as indicated by a reciprocating arrow ab.

As is easily understood with reference to FIG. 4, when the pipe 1 swings, the outside mirror 4 swings and the mirror image changes irregularly, which is a problem.

It is possible to apply a well-known technique to firmly fix the pipe 1 so as not to swing with respect to the bracket 3.

However, if various well-known fixing means are applied to firmly fix, various problems will occur.

For example, if the number of the mounting screws 5 installed is increased, the number of labors for the mounting and dismounting work is increased.

Moreover, disassembly becomes impossible if installation and welding are used together.

Further, for example, if the fitting length between the pipe 1 and the bracket 3 is increased, the fixed structure portion becomes large and heavy, and the manufacturing cost increases.

Further, for example, if the pipe 1 is provided with a male screw and the bracket 3 is provided with a female screw for screwing, the structure becomes complicated and the manufacturing cost increases, and in addition, the attachment and detachment work requires labor.

The above-mentioned problem is the swing in the direction of the reciprocating arc arrow ab shown in FIG. 6, but the same problem also occurs in the rotation in the direction of the reciprocating elliptical arrow θ shown in FIG.

That is, as can be easily understood from FIG. 4, in the outside mirror support structure of this conventional example, when a vehicle equipped with this support structure runs at high speed and wind pressure is applied to the outside mirror 4, the pipe 1 A rotational force in the direction of the reciprocating arrow θ shown in the figure is applied to.

Considering FIG. 7, only the removal screw 5 receives the force of the reciprocating arrow θ applied to the pipe 1.

The force to turn the pipe 1 receives not only the wind pressure during traveling as described above, but also the force in the rotation direction (arrow θ) when the outside mirror collides with an external object. Moreover, in this case, since an impact load is applied, the removal screw 5 receives a severe shear. In addition, the gap g shown in FIG.
Due to the existence of, the mounting screw 5 is also bent.

As described above, in the fixing structure of the conventional example, it is technically difficult to fix the rotation of the pipe 1 around the axis.

As a general theory, various techniques are known for preventing the rotation of the shaft (rotation around the shaft center) with respect to the bracket. Welding, adhesive, shrink fitting, split tightening, spline connection, key connection, serration connection. It is conceivable that the number of mounting screws (set screws) and / or the diameter of the mounting screws is increased. However, considering the usage conditions regarding the structure for fixing the pipe for the outside mirror and the bracket, it is difficult to put these various known techniques into practical use due to their respective disadvantages. That is, increasing the number of mounting screws increases the number of constituent parts of the fixing portion structure and also increases the size and weight. Not only that, the man-hours required for disassembling and assembling are increased to deteriorate the workability in assembling and maintainability.

Further, increasing the diameter of the mounting screw is difficult to achieve practical effects unless the increase in the wall thickness of the pipe 1 and the relationship with the pitch of the screw are taken into consideration. However, increasing the wall thickness of the pipe 1 causes a significant increase in weight and an increase in material cost, and therefore has a large demerit and is not suitable for practical use.

Welding the pipe 1 and the bracket 3 is a method often used in general, but in the case of the outside mirror pipe-bracket attachment, it is necessary to disassemble and reassemble the pipe. Welding cannot be applied from the aspect of the property.

Adhesion using an adhesive or shrink-fitting also has the problem that the same maintainability as in the above welding is impaired.

The spline connection and the key connection have a relation with the wall thickness for the pipe connection, and cannot be applied to the thin wall pipe. However, if the pipe for the outer mirror is made thick to withstand spline coupling and key coupling, the disadvantages such as increased weight and cost are too great, and the machining cost increases, which is uneconomical and impractical. There is no.

Since the use of serration coupling can be applied to a relatively thin pipe, a strong anti-rotation effect can be expected without increasing the weight of the outer mirror as a whole.

However, when trying to connect the pipe and the bracket to the serration, the inner surface of the outer peripheral portion of the end portion of the pipe 1 and the hole provided in the bracket (the pipe fitting hole corresponding to the hole 3a shown in FIG. 4) Since both must be machined, the manufacturing process becomes complicated and the machining cost rises, which is uneconomical.

If the pipe fitting portion of the bracket is configured as a split tightening type, not only the manufacturing cost will be increased, but also the design of the outer mirror as a whole will be affected, the appearance will be deteriorated and the commercial value thereof will be reduced, such being unsuitable.

Even if the kotatsu connection is applied, the appearance is impaired as in the above case.

Any one of the various known techniques described above is applied to prevent the pipe 1 and the bracket 3 from rotating, or any two or more of these known techniques are used together to form the pipe 1 and the bracket 3. Although taking the anti-rotation measure is beyond the scope of general design consideration, as for the anti-rotation structure between the outer mirror pipe and the bracket, as described above, FIG. A kind of detent, that is, a detent in the direction of the reciprocating arc arrow ab centering on the mounting screw 5, and a fixing of the reciprocating elliptic arc in the direction of the arrow θ so as not to exert a shear on the mounting screw 5. However, there are both problems, and they cannot be solved by applying known technologies or by combining known technologies.

Since the present invention has been made in view of the above-mentioned circumstances, there is no fear of making the device large and heavy, and in particular, the wall thickness of the pipe is not increased, and the number of man-hours required for mounting and dismounting work is not increased, and , Does not include components that increase the cost of machining, "fit one end of the pipe into the hole provided in the bracket and tighten with only one removal screw"
It is an object of the present invention to apply a fixing structure of an outer mirror support pipe capable of reliably fixing a pipe to a bracket in a stable state without changing the simple structure.

[Means for Solving the Problems]

The fixing structure of the outer mirror support pipe according to the present invention, which is created to achieve the above object, is a structure for fixing the pipe supporting the outer mirror to the bracket, and a portion having a length L from the end of the pipe. On the side surface of the hole, a female screw hole provided in the vicinity of the center of the flat surface portion, a taper hole having a large inlet diameter which exceeds the depth dimension L and is provided on the bracket. Also, it is characterized by comprising a through hole for inserting a set screw.

[Action]

According to the above configuration, the hole of the bracket and the pipe are located at two points at the ends of the lines on both sides of the flat surface portion provided on the pipe and at the center of the pipe (center in the length direction) with respect to the flat surface portion. It contacts and is pressed at 3 points, 1 point. Therefore, the fixed state of the pipe becomes stable.

Moreover, since the basic configuration of "fitting one end of the pipe into the hole provided in the bracket and tightening with only one removal screw" is not changed, there is no fear of increasing the shape and weight of the device. There is no fear of increasing the work required for the attachment / detachment work, nor does it significantly increase the manufacturing cost.

〔Example〕

1 to 3 show an embodiment of the present invention, and FIG. 1 is a perspective view corresponding to FIG. 5 in the conventional example.

This embodiment is obtained by applying the present invention to the above-mentioned conventional example, and the same reference numerals as those in the above-mentioned example are attached to the conventional example (FIGS. 6 to 8). The same components as in are shown. Those with a dash are similar members corresponding to the components of the conventional example.

A flat surface portion 1b is formed in a portion having a length L at the tip of the pipe 1 ', and a female screw hole 1a for a mounting screw is provided near the central portion thereof.

In this example, the flat portion 1b was formed by press-molding the tip of the steel pipe 1 '. Female screw hole during this press molding
The meat is applied near 1a.

The depth dimension of the hole 3a is D, and the dimension L is set so that D> L.

FIG. 2 is a vertical sectional view of the fitting portion, and FIG. 3 is a perspective view of the pipe 1 '.

Since the pipe 1'shown in FIG. 3 comes into contact with the hole 3a at three points, that is, two points C, D and E shown in the drawing, the pipe 1'swings (around the axis of the mounting screw 5). Rocking) and rotation around the axis are reliably prevented, and the fixed state of the pipe 1'is stabilized. In order to further stabilize the contact between these three points C, D and E and the inner peripheral surface of the hole 3a, the hole 3a is tapered so as to expand in the inlet direction.

[Effect of device]

As described above, according to the fixing structure of the outer mirror support pipe of the present invention, there is no fear that the device will be large and heavy, and the wall thickness of the pipe will not be particularly increased, and the number of man-hours required for the mounting and dismounting work will be reduced. Without increasing, and
Does not include components that increase the cost of machining.
"Match one end of the pipe into the hole in the bracket,
It has an excellent practical effect that the pipe and the bracket can be securely fixed in a stable state without changing the simple structure of "tightening with only one mounting screw".

[Brief description of drawings]

1 to 3 show an embodiment of a fixing structure for an outer mirror support pipe according to the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a longitudinal sectional view, and FIG. 3 is a perspective view of the pipe. is there. 4 to 8 show a conventional example, FIG. 4 is an external view for explaining the outside mirror support mechanism, FIG. 5 is an exploded perspective view of the vicinity of the pipe mounting portion, and FIG. 6 is FIG. VI arrow shown in FIG. 7, FIG. 7 is a VII-VII sectional view shown in FIG. 6, and FIG. 8 is a VIII-VIII sectional view shown in FIG. 1, 1 '... Pipe, 1a ... Female screw hole, 1b ... Plan view, 2 ... Clamp, 3 ... Bracket, 3a ... Hole, 3b ... Through hole,
4 ... Outside mirror, 5 ... Mounting screw.

Claims (1)

[Scope of utility model registration request] 1. A structure for fixing a pipe supporting an outer mirror to a bracket, wherein a flat portion is provided at a portion having a length L from the end of the pipe, and a female portion provided near the center of the flat portion. It is characterized by comprising a screw hole, a taper hole provided in the bracket and having a large entrance diameter exceeding the depth dimension L, and a through hole for inserting a set screw provided on a side surface of the hole. The fixed structure of the outer mirror support pipe.