JPH0614083Y2 - Hollow member connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a hollow member connecting structure for connecting hollow members such as square pipes and box-shaped cross-section members in a fitted state.

(Prior Art) When connecting hollow members such as square pipes and box-shaped members having different outer dimensions with bolts in a fitted state, it is necessary to make a sufficient gap between the outer hollow member and the inner hollow member. The fitting work of both becomes easy. However, if there is a gap between them, there is a problem that the outer hollow member is attracted to the inner hollow member and deformed in response to the fastening of the bolt.

The applicant has previously filed a Japanese Patent Application No. 62-29286 for such problems.
No. 0 proposes a new hollow member coupling structure.

According to this prior art, as shown in FIG.
First bolt e having a screw shaft portion c provided with a small-diameter screw shaft portion b and a head portion d, and a screw shaft portion g having a screw hole f screwed into the screw shaft portion c and a head. Using a special bolt consisting of the second bolt i having the portion h, the screw shaft portion g of the second bolt i is inserted into one side wall of the outer hollow member j at each end of the hollow members j and k to be fitted. The hole 1 is formed, and a female screw portion m with which the screw shaft portion g is screwed is provided on one side wall of the inner hollow member k overlapping this one side wall, and a small diameter screw of the first bolt e is provided on the other side wall of the outer hollow member j. A female screw portion n with which the shaft portion b is screwed is provided, and an insertion hole o of the small-diameter screw shaft portion b is provided on the other side wall of the inner hollow member k overlapping the other side wall.

In order to connect both hollow members j and k, the screw shaft part g of the second bolt i is screwed into the female screw part m of the inner hollow member k, and this female screw part m and the head h of the second bolt i. And the hollow members j and k are fastened to each other on one side wall. Next, the first bolt e is turned to screw the small-diameter screw shaft portion b into the female screw portion n of the outer hollow member j. At this time, the dimension between the female screw portions n and m is kept constant by the screw shaft portions b and c of the first bolt e, so that the outer hollow member j is not deformed.

On the other hand, the step surface a of the first bolt e contacts the other side wall of the inner hollow member k and presses it against the other side wall of the outer hollow member j,
Between the step surface a and the female screw portion n, both hollow members j, k
Is fastened to the other side wall. Thereby, both hollow members j,
It is possible to connect k to the outer hollow member j without causing deformation.

(Problems to be solved by the invention) However, in the above prior art, the area of the step surface of the first bolt is the first.
Since the diameter of the screw shaft portion of the bolt is restricted, the tightening area of the bolt tip portion with respect to the inner hollow member becomes small, and the fastening force at the bolt tip portion tends to be insufficient.

The present invention is an improvement over the above prior art, and provides a hollow member connecting structure capable of increasing the tightening area of the first bolt tip with respect to the inner hollow member and increasing the tightening force at the bolt tip. To aim.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a first bolt having a screw shaft portion provided with an engaging portion and a head portion, and a screw hole to be screwed into the screw shaft portion. A second bolt having a formed screw shaft portion and a head portion; and a screw shaft portion of the first bolt,
For the screw shaft portion of the bolt, a special bolt in which the second bolt is screwed so that the head portion faces the head portion side of the first bolt between the head portion of the first bolt and the locking portion, An insertion hole for a screw shaft portion of a second bolt is formed in one side wall of the outer hollow member at each end of both hollow members to be fitted, and a screw of the second bolt is formed in one side wall of the inner hollow member overlapping the one side wall. A female screw portion with which the shaft portion is screwed is provided, and the first side wall is provided on the other side wall of the outer hollow member.
A female screw portion with which the screw shaft portion of the bolt is screwed is provided, and an insertion hole for the screw shaft portion of the first bolt is provided on the other side wall of the inner hollow member that overlaps the other side wall, and the inner surface of the female screw portion of the inner hollow member is provided. It is characterized in that the large-diameter ring-shaped body which is inserted into the side of the screw shaft portion of the first bolt and engages with the engaging portion is temporarily fixed.

(Operation) According to the above configuration, the screw shaft portion of the first bolt is passed through the insertion hole of the outer hollow member and the female screw portion of the inner hollow member on one side wall of the both hollow members in the fitted state to form the female screw. By inserting into a large-diameter ring-shaped body temporarily fixed to the inner surface of the part,
The large-diameter ring-shaped body engages with the engaging portion of the screw shaft portion, is removed from the female screw portion, and is retained by the first bolt. Then, the screw shaft portion of the second bolt is screwed into the female screw portion of the inner hollow member, and both hollow members are fastened and fixed at one side wall between the female screw portion and the head portion of the second bolt. By rotating the bolt, the large-diameter ring-shaped body contacts the inner surface of the other side wall of the inner hollow member, presses the other side wall of the inner hollow member against the other side wall of the outer hollow member, and causes the tip of the screw shaft portion of the first bolt to move outward. By screwing into the female screw portion of the hollow member, both hollow members can be fastened and fixed on the other side wall between the female screw portion and the large-diameter ring-shaped body.

In this way, both side walls of the inner hollow member can be pushed and spread over both side walls of the outer hollow member to fasten and fix both hollow members on both side walls, so that the outer hollow member does not deform and the two hollow members do not deform. Can be combined.

Further, since the fastening area for the other side wall can be expanded by the large-diameter ring-shaped body without being restricted by the screw shaft portion diameter of the first bolt, the tightening force for the inner and outer hollow members of the bolt tip portion can be increased. Can be increased.

(Embodiment) FIGS. 1 to 4 show that the present invention has a body divided into upper and lower parts, and a lower end portion of an upper front pillar (outer hollow member) 1 is fitted to an upper end portion of a lower front pillar (inner hollow member) 2. It shows an embodiment applied to an automobile which is coupled in a fitted state.

The upper front pillar 1 and the lower front pillar 2 are composed of outer panels 1a and 2a and inner panels 1b and 2b, respectively. As shown in FIG. 3, the upper end portion of the lower front pillar 2 is formed to have a smaller outer dimension than the lower end portion of the upper front pillar 1, and a gap is formed between the both end portions in a fitted state. Large diameter through holes 3 and 4 are formed in the outer panels 1a and 2a at both ends, and the through holes 4 of the lower front pillar 2 are formed.
An outer nut (female screw portion) 5 is fixed to the inner surface of the by welding. On the inner panels 1b and 2b at both ends,
Small-diameter insertion holes 6 and 7 are formed on the same axis as the insertion holes 3 and 4, and an inner nut (female screw portion) 8 is fixed to the outer surface of the insertion hole 6 of the upper front pillar 1 by welding. There is.

Lower end of upper front pillar 1 and lower front pillar 2
The special bolt 10 that fastens and connects the upper end of the
The bolt 11 and the short second bolt 12 into which the first bolt 11 is screwed through are provided.

The first bolt 11 has a head portion 14 and a screw shaft portion 15 having the same overall length. An engagement nut (engagement portion) 13 is fixed to the screw shaft portion 15 in a screwed state. Further, the screw shaft portion 15 is screwed into the inner nut 8.

The second bolt 12 has a head 16 and a screw shaft portion 18 in which a screw hole 17 to be screwed into the screw shaft portion 15 is formed. The screw shaft portion 18 is screwed into the outer nut 5. Second bolt
The head 16 of 12 has a recess 19 for receiving the head 14 of the first bolt 11.
And a washer portion 22 having a diameter larger than that of the head portion 16 integrally formed with the head portion 16. The outer diameter of the engagement nut 13 is slightly smaller than the inner diameter of the screw hole 17.

A large-diameter ring-shaped body 20 into which the screw shaft portion 15 of the first bolt 11 is inserted and engages with the engagement nut 13 is attached to the inner surface side of the lower front pillar 2 of the outer side nut 5 by using an adhesive or the like. It is temporarily stopped. The large-diameter ring-shaped body 20 is provided with a female screw portion 21 that is screwed into the screw shaft portion 15.

In the above configuration, when the upper front pillar 1 and the lower front pillar 2 are joined together, the upper front pillar 1
The lower end portion of the lower front pillar 2 is fitted over the upper end portion of the lower front pillar 2 so that the outer side insertion holes 3 and 4 and the inner side insertion holes 6 and 7 are aligned with each other, and then the outer panel of the upper front pillar 1.
Insert the tip side of the special bolt 10 into the insertion holes 3 and 4 from the outside of 1a, and as shown in FIG.
15 is screwed into the female screw 21 of the large-diameter ring-shaped body 20.

When the first bolt 11 is turned with a wrench or the like in this state, the engagement nut 13 of the screw shaft portion 15 comes into contact with the large-diameter ring-shaped body 20, and the large-diameter ring-shaped body 20 receives a rotational force in the same direction as the first bolt 11. give. As a result, a shearing force is generated between the large-diameter ring-shaped body 20 and the outer nut 5, so that the large-diameter ring-shaped body 20 can be detached from the nut 5 and can be screwed and held by the screw shaft portion 15. Therefore, the large-diameter ring-shaped body 20 is not likely to fall off after being removed from the outer nut 5.

Next, the screw shaft portion 18 of the second bolt 12 is screwed into the outer nut 5. Then, by turning the second bolt 12 with a spanner or the like, as shown in FIG.
The a and 2a can be clamped and fixed between the outer nut 5 and the head 16 of the second bolt 12. Since the head portion 16 has the large-diameter metal member portion 22, the tightening area of the upper front pillar 1 with respect to the outer panel 1a is large, and the tightening force can be sufficiently exerted.

In this state, the first bolt 11 is turned, and the tip of the screw shaft portion 15 is screwed into the inner nut 8. When the first bolt 11 is further rotated, the large-diameter ring-shaped body 20 comes into contact with the inner panel 2b of the lower front pillar 2 and presses it against the inner panel 1b of the upper front pillar 1. As a result, the inner panels 1b and 2b at both ends can be clamped and fixed between the inner nut 8 and the large-diameter ring-shaped body 20.

In this way, by pressing and expanding both panels 2a, 2b of the lower front pillar 2 and pressingly deforming them to both panels 1a, 1b of the upper front pillar 1, without deforming the outer shape of the lower end portion of the upper front pillar 1, The upper front pillar 1 and the lower front pillar 2 can be joined simply by operating the special bolt 10 from the outer side.

Further, according to this embodiment, since the screw shaft portion 15 of the first bolt 11 has the same diameter over the entire length, the tip end portion to be screwed into the inner side nut 8 of the upper front pillar 1 is the same as in the prior art (see FIG. 6). Since the tip screw shaft portion b of the first bolt e can have a large diameter as compared with a small diameter, the screw strength at the bolt tip portion can be improved and the screw shaft portion 15 has a prior art. Since there is no such stepped surface a, there is also an advantage that stepping processing is unnecessary and the manufacturing cost can be reduced.

The present invention can be constructed in various modes other than the above-mentioned embodiments.

For example, as in another embodiment of the present invention shown in FIG. 5, a small-diameter screw shaft portion 15a is provided at the tip of the screw shaft portion 15 of the first bolt 11 via a step surface (engaging portion) 13. The large-diameter ring-shaped body 20 can be configured so that the small-diameter screw shaft portion 15a is inserted and engages with the step surface 13. The other structure of this embodiment is the same as that of the above embodiment, and therefore, the same reference numerals are given and the description thereof will be omitted. In this embodiment, the prior art shown in FIG. 6 is used almost as it is, and by adding a large-diameter ring-shaped body 13 thereto, the problem that the tightening force at the tip of the bolt of the prior art is insufficient is solved. ing. That is, in the case of the prior art, the tightening area for both hollow members at the tip of the bolt is limited to the step surface a (step surface 13 in this embodiment) of the first bolt e, and the area of this step portion a is the first. Since the diameter of the screw shaft portion c of the bolt e is limited, there is a problem that the tightening area cannot be sufficiently obtained. On the other hand, in the present embodiment, by using the large-diameter ring-shaped body 13, the tightening area can be dramatically increased without being restricted by the diameter of the screw shaft portion 15.

In the present invention, a female screw may be formed directly on the outer panel 2a of the lower front pillar 2 instead of the outer nut 5 of the above embodiment. Similarly, instead of the inner nut 8, the inner panel of the upper front pillar 1 may be formed. A female screw may be directly formed on 1b.

(Effect of the Invention) According to the present invention, when the outer hollow member and the inner hollow member are joined together in a fitted state, the both hollow members can be joined together without deforming the outer shape of the outer hollow member, and the bolts can be joined together. The tightening force at the tip can be increased.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an essential part of an embodiment of the present invention, FIG. 2 is an exploded perspective view, FIGS. 3 and 4 are vertical sectional views in respective connecting processes, and FIG. FIG. 6 is a longitudinal sectional view of an essential part of this embodiment, and FIG. 6 is a longitudinal sectional view of an essential part of the prior art. 1 ... Outer hollow member 2 ... Inner hollow member 3,7 ... Insertion hole 5,8 ... Female screw portion 10 ... Special bolt 11 ... First bolt 12 ... Second bolt 13 ... Engagement portion 14, 16 …… Head 15, 18 …… Screw shank 17 …… Screw hole 20 …… Large-diameter ring

Claims (1)

[Scope of utility model registration request] 1. A first bolt having a screw shaft portion provided with an engaging portion and a head portion, and a second bolt having a screw shaft portion and a head portion formed with a screw hole to be screwed into the screw shaft portion. And the first
With a screw shaft portion of the bolt, the screw shaft portion of the first bolt,
Both hollow members that are fitted together by using a special bolt in which the second bolt is screwed between the head portion of the first bolt and the engaging portion so that the head portion faces the head portion side of the first bolt. A threaded shaft portion of the second bolt is formed in one side wall of the outer hollow member at each end of the female hollow member, and the screw shaft portion of the second bolt is screwed into the one side wall of the inner hollow member overlapping the one side wall. A threaded portion is provided, and a female screw portion with which the screw shaft portion of the first bolt is screwed is provided on the other side wall of the outer hollow member, and the screw shaft portion of the first bolt is inserted into the other side wall of the inner hollow member that overlaps the other side wall. It is characterized in that a hole is provided and a large-diameter ring-shaped body that engages with the engaging portion while the screw shaft portion of the first bolt is inserted on the inner surface side of the female screw portion of the inner hollow member is temporarily fixed. Coupling structure of hollow members.