JPH0728072Y2 - Bicycle pipe fixing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a bicycle pipe fixing structure, and in particular, a pipe constituting a bicycle frame or the like is fitted to a fitted portion such as a protrusion of a head lug. The present invention relates to a pipe fixing structure that is fixed to each other with an adhesive.

(Technical background of the invention) When fixing a pipe constituting a frame to a head lug to which a handlebar is attached, conventionally, an adhesive is applied to the outer peripheral surface of the protrusion of the head lug and the inner peripheral surface of the pipe end is also adhered with the adhesive. It is applied, and the end of this pipe is fitted and fixed to the projection (Japanese Utility Model Laid-Open No. 57-8191, etc.).

By the way, since an adhesive with a relatively high viscosity is used as the adhesive for fixing the pipe, it is not possible to use a brush or the like.Therefore, conventionally, a spatula has been used to spread the adhesive and apply it to the projection or the pipe. is doing.

(Problems of the background art) However, it takes much time and effort to spread and apply the adhesive using a spatula. In the case of this extended coating, the required coating thickness (0.05 to 0.15
mm) or more of the adhesive is applied, so if the pipe is fitted to the protrusion, excess adhesive will stick out of the fitting part. Therefore, the workability is further lowered, and the amount of the adhesive used is increased, which is uneconomical.

(Object of the Invention) An object of the present invention is to provide a bicycle pipe fixing structure having a structure in which a pipe and a fitted portion can be fixed to each other with good workability by a predetermined amount of an adhesive.

(Outline of the Invention) In the present invention, an adhesive filling space is formed between a pipe and a fitting portion, the adhesive filling space is partitioned by a space partition protrusion, and an adhesive injection port communicating with the space is used for adhesion. The agent is injected into the space, and the adhesive is guided to the air outlet side by the space partitioning protrusion.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 3 shows a frame structure of the bicycle, and 1 is a head lug made of aluminum. As shown in FIG. 4, projections 1a and 1b are integrally formed at the upper and lower positions of the head lug 1. The frame also includes a seat lug 2 and a bracket shell 3. Seat lug 2 has protrusions 2a, 2
b is integrally formed, and the bracket shell 3 has projections 3a to 3a.
c is integrally formed.

The protrusion 3a of the bracket shell 3 is press-fitted into the lower end of the lower pipe 5, and the protrusion 2a of the seat lug 2 is press-fitted into one end of the upper pipe 4. Further, the projection 2b of the seat lug 2 and the projection 3b of the bracket shell 3 are press-fitted into the upper and lower ends of the standing pipe 6, respectively, and the projection 3c of the bracket shell 3 is connected to the chain stay 7
Is press-fitted at one end. A protrusion (not shown) of the joint member 8 is press-fitted to the other end of the chain stay 7, and another protrusion of the joint member 8 and a small-diameter protrusion (not shown) of the seat lug 2 are press-fitted to both ends of the back fork 9, respectively.

Now, as shown in FIGS. 1 and 2, the protrusion 1a (1b) of the head lug 1 is formed integrally with the small diameter portion 10 and the small diameter portion 10 which are formed to have a small diameter by 0.1 mm. Base
11 and a large diameter portion 12 at the tip. And this protrusion 1a
In (1b), the upper pipe 4 is provided via the base portion 11 and the large-diameter tip portion 12.
(Lower pipe 5) is fitted so that an adhesive filling space is formed between the small diameter portion 10 and the inner peripheral surface of the upper pipe 4 (lower pipe 5).
13 are formed.

An adhesive injection port 14 penetrating in the thickness direction is provided on the tip side of the upper pipe 4 (lower pipe 5) so as to communicate with the adhesive filling space 13. Further, the large-diameter portion 12 of the tip of the protrusion 1a (1b) is provided with an air discharge port 15 formed by removing a part thereof. A space partitioning protrusion 16 is provided on the peripheral surface of the small diameter portion 10 of the protrusion 1a (1b). This space partition protrusion
16 has a height of 0.1 mm and is formed in a spiral shape, one end is connected to the base 11 near the adhesive injection port 14, and the other end is connected to the large-diameter tip 12 near the air discharge port 15. It is connected. Therefore, the space partition projection 16 contacts the inner peripheral surface of the upper pipe 4 (lower pipe 5) and partitions the adhesive filling space 13 to form a flow path for the adhesive.

In the pipe fixing structure having the above configuration, the nozzle of the adhesive injection device (not shown) is pressed against the adhesive injection port 14 to fill the adhesive filling space 13 with the adhesive 17 via the injection port 14. In this case, since the adhesive 17 is injected at a constant pressure, while the air in the adhesive filling space 13 is being discharged from the air discharge port 15, the adhesive 17 is gradually guided to the air discharge port 15 side by the air partition projection 16 and the filling is performed. The space 10 is filled. Then, when the filling space 13 is completely filled with the adhesive 17, the air is about to be discharged from the air discharge port 15 having a large flow resistance. Therefore,
A certain amount of adhesive 17 corresponding to the volume of the adhesive filling space 13
By injecting, it is possible to prevent the adhesive 17 from being used unnecessarily, and it is not necessary to perform a wiping operation. Further, since the adhesive 17 flows by being guided by the space partitioning projections 16, the adhesive filling space 13 is reliably filled in about 4 seconds. Therefore, the workability is remarkably improved, and moreover, a certain amount of the adhesive can always be surely filled, so that the pipe and the protrusion can be fixed stably and firmly.

In the above-described embodiment, the projections of the seat lug 2 and the bracket shell 3 and the pipe are fixed to the adhesive 17 via the adhesive filling space 13, the adhesive injection port 14, the air discharge port 15 and the space partitioning projection 16 as described above. You may make it adhere | attach by.

Further, it is needless to say that the present invention can be applied to a case where a handle pipe is fixed to a handle lug and a case where other pipe material is fixed to a fitting portion such as a protrusion.

Incidentally, the adhesive 17 can be filled in the adhesive filling space 13 even if air is sucked at the air discharge port 15 side without injecting the adhesive 17 at a constant pressure, and the injection of constant pressure and the suction of air are simultaneously performed. When this is done, the adhesive 17 can be filled more quickly.

FIG. 5 shows a modification of FIGS. 1 and 2.
In this modification, an air outlet 18 is provided on the upper pipe 4 (lower pipe 5) side.

6 and 7 show another embodiment of the present invention. In this embodiment, an annular space partition projection 19 is provided at the center of the peripheral surface of the small diameter portion 10 of the projection 1a (1b). As shown in FIG. 7, a part of the space partition projection 19 is cut out to form a communication passage 20. Then, the protrusion 1a (1
A space outlet 15 is provided in the large-diameter portion 12 at the tip of b).
In this embodiment, when the adhesive agent 17 is injected from the adhesive agent injection port 14, the adhesive agent 17 is filled in a half portion of the adhesive agent filling space 13 on the injection port 14 side, and then the space 13 is passed through the communication passage 20. Is filled in a half portion of the air outlet 15 side.

FIG. 8 shows a modification of FIGS. 6 and 7. In this modification, an air outlet is provided on the upper pipe 4 (lower pipe 5) side.
18 are provided.

9 (A) to 9 (C) are cross-sectional views of a fixing structure according to another embodiment of the present invention on a front side, a plane side and a bottom side.
Figure 10 is the development view. In this embodiment, the protrusion 1a (1b)
A plurality of space partition projections 21A to 21D extending along the axial direction are provided on the peripheral surface of the small diameter portion 10. That is, the small-diameter portion 10 has a long space partitioning projection 21A connecting the base 11 of the projection 1a (1b) and the tip large-diameter portion 12, space partitioning projections 21B and 21D extending from the base 11, and a large tip diameter. A space partition protrusion 21C extending in the opposite direction from the portion 12 is provided. Therefore, the adhesive 17 injected from the adhesive injection port 14 is guided along the arrow in the adhesive filling space 13 by the space partition projections 21A to 21D as shown in FIG. Surely filled.

FIG. 11 further shows another embodiment of the present invention. In this embodiment, the protrusion 1a (1b) is formed to have a small diameter as a whole, and an annular groove 22 having a substantially semicircular cross section is provided on the peripheral surfaces on both ends. An annular seal member 23 is engaged in these annular grooves 22 and 22, and the upper pipe 4 is in contact with each annular seal member 23.
The (lower pipe 5) is airtightly fitted to the protrusion 1a (1b). The annular sealing material 23 is formed of an elastic material such as a plastic material, and an adhesive filling space is provided between them.
13 are provided. An air discharge port 24, which is a recess communicating with the adhesive filling space 13, is provided on the circumferential surface of the protrusion 1a (1b) on the tip side. An annular space partition protrusion 19 is provided at the center of the protrusion 1a (1b), and a part of the protrusion 19 is cut out to form a communication passage 20. In this embodiment, since the fitting tolerance between the protrusion 1a (1b) and the upper pipe 4 (lower pipe 5) can be set to a large value, they can be easily manufactured.

FIG. 12 shows another embodiment. In this embodiment, an annular recess is provided in the approximate center of the protrusion 1a (1b), whereby an adhesive filling space 13 is provided between the upper pipe 4 (lower pipe 5) and the outer peripheral surface of the protrusion 1a (1b). Has been formed. Protrusion 1a
An annular space partition protrusion 19 is provided in the recess of (1b),
Further, a part thereof is cut out to form a communication passage 20.
An adhesive injection port 14 and an air discharge port 18 penetrating in the thickness direction are provided on the protrusion 1a (1b) side so as to communicate with the adhesive filling space 13.

In the embodiment shown in FIG. 12, the adhesive 17 is injected from the inside of the projection 1a (1b), and the adhesive 17 is divided into the space partition projection 19
It is guided from the injection port 14 side to the air discharge port 18 side through the space to fill the adhesive filling space 13. In this example, the adhesive injection port
Since 14 and the air outlet 18 do not appear outside,
Excellent in appearance.

(Advantages of the Invention) According to the present invention, an adhesive filling space is formed between the pipe and the fitting portion, and the adhesive filling space is partitioned by the space partitioning projections and communicates with the space. Since more adhesive is injected into the space and this adhesive is guided to the air outlet side by the space partition protrusion, a certain amount of adhesive can be reliably filled in the adhesive filling space in a short time. It is possible to provide a pipe fixing structure for a bicycle, which can be filled with good performance and can fix the pipe to the fitted portion with stable strength.

[Brief description of drawings]

1 and 2 are sectional views of a pipe fixing structure according to the present invention and a sectional view taken along the line AA, and FIGS. 3 and 4 are overall structural views of a bicycle frame and sectional views of its main parts, FIG. 5 is a sectional view showing a modified example of the embodiment of FIG. 1, FIGS. 6 and 7 are sectional views of another embodiment of the present invention and its sectional view taken along the line BB,
FIG. 8 is a sectional view showing a modification of FIG. 6, and FIGS. 9 (A) to (C) and FIG. 10 show still another embodiment of the present invention from the front side, the plane side and the bottom side, respectively. A cross-sectional view and its development, and FIGS. 11 and 12 are cross-sectional views showing still another embodiment of the present invention. 1a, 1b …… Protrusion, 4,5 …… Pipe, 13 …… Adhesive filling space, 14 …… Adhesive inlet, 15,18,24 …… Air outlet, 17
…… Adhesives, 16,19,21A to 21D …… Space partition protrusions, 23…
... annular sealing material.

Claims (4)

[Scope of utility model registration request] 1. A pipe pipe fixing structure for a bicycle, comprising: a pipe constituting a bicycle; and a fitted portion into which the pipe is fitted; an adhesive formed between the pipe and the fitted portion. A filling space, an adhesive injection port that communicates with one end of the adhesive filling space, an air discharge port that communicates with the other end of the adhesive filling space, and an adhesive injected into the adhesive filling space. A pipe fixing structure for a bicycle, comprising: a space partitioning protrusion that guides to the air outlet side. 2. The bicycle pipe fixing structure according to claim 1, wherein the space partition protrusion is provided on a peripheral surface of the fitted portion. 3. The bicycle pipe fixing structure according to claim 1, wherein the adhesive injection port and the air discharge port are provided in any one of the pipe and the fitted portion. 4. The adhesive filling space is formed by an annular sealing material which is arranged between the pipe and the fitted portion and maintains liquid tightness. The bicycle pipe fixing structure described.