JPH07117771A - Saddle installing device for bicycle - Google Patents

Abstract

PURPOSE:To provide a structure by which a seat post can be removed and does not slip out easily and which can be adopeted to a general bicycle in a saddle installing device for a bicycle. CONSTITUTION:A cylinder body 8 is arranged in an inside lower end part of a seat post 3, and a symmetric pin 9 is arranged in the cylinder body 8 so as to be protrusible, and a central pressing screw of the cylinder body 8 is rotated, and the pin 9 is protruded in a vertical pipe, and slipping-out prevention of the seat post 3 is performed. Thereby, the protruding pin interferes with a small diameter inlet part in the vetical pipe, and exhibits a pulling-up quantity regulating effect. When the pressing screw is loosened, it can be removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle saddle mounting device.

[0002]

2. Description of the Related Art Conventionally, in a bicycle, when a seat post of a saddle is fixed to a vertical pipe of a frame, the outer periphery of the seat post is often simply tightened and fixed. Anyone can remove it so that the saddle is stolen. There was a case. In addition, in order to fix the seat securely, the JIS standard stipulates that the seat post should be fitted with a fitting limit mark that indicates the minimum fitting length with the frame in a way that does not easily disappear. It is said that the mark must not be less than twice the diameter of the post from the lower end of the complete circumferential part, and the strength of the seat post must not be impaired by this mark. However, in practical use, the determination was not easy, and there were cases where dangerous fixing was performed. In particular, when an unspecified number of people use the bicycle in the rental cycle, there was a problem in safety.

Therefore, as an example of mechanically preventing the slip-out and regulating the withdrawal amount, for example, Japanese Utility Model Laid-Open No. 2-11785,
Some of them are disclosed in Japanese Utility Model Publication No. 49-32347, but there were various problems.

First, in the former, the linear member plays in the seat tube and causes noise, and it is difficult to fix the retaining member to the linear member and the seat tube, which makes it difficult to put the concrete structure into practical use. There was a problem.

In the latter case, it is difficult in practice to form a vertical groove on a post that is slidably fitted in terms of strength, weight and accuracy, and it is difficult to align the groove fitting during assembly. was there.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and to provide a structure that is easy to operate and that can reliably regulate the seat post withdrawal height.

[0007]

In order to solve the above problems, the present invention is a seatpost which is inserted into a standpipe of a bicycle, has a saddle attached to the upper end and has a hole at the lower end, and this seatpost. A cylindrical body which is disposed at the inner lower end of the cylindrical body and which has a through hole corresponding to the hole and a screw hole which communicates with the through hole in the central portion, and the seat post of the seat post in the through hole of the cylindrical body. The pin includes a pin whose tip portion is arranged to project into the vertical pipe through the hole, and a pressing screw which is screwed into the screw hole of the cylindrical body so as to come into contact with the rear end portion of the pin. The seat post is prevented from coming off from the standing pipe by projecting the pin into the standing pipe and locking the pin to the standing pipe.

[0008]

With this structure, when the pressing screw is pushed into the cylindrical body, the pin projects outward. Therefore, even if the seat post is pulled up by adjusting the saddle or the like, the pin protruding portion interferes with the small diameter portion provided in the standing pipe opening portion and cannot be pulled out further.
Therefore, not only can it be prevented from coming off, but the size required for tightening with the seat pin can be secured.

In the case of removal for repair or the like, it is possible by inserting a tool longer than above the seat post and returning the pressing screw.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, 1 is a standing pipe which constitutes a frame, 2 is a seat lug, 3 is a seat post, which is fastened by a seat pin 4 while being inserted into a standing pipe 1 together with a seat stay 5 and fixed to the standing pipe. A saddle 6 is fixed to the seat post 3 by a tower 7. The seat post 3 is squeezed by an upper yagura fixing part, and an upper part is an open part 3a. A cylindrical body 8 is provided at the inner lower end of the seat post 3, and pins 9 are provided on the left and right.
Is protruding.

FIG. 2 shows details of the retaining structure. The cylindrical body 8 has a tapered portion 8a on the upper side, and the tapered portion 8a
It has a screw hole 8b in the center portion thereof which is continuous with a. Also,
Through holes 8c are provided symmetrically about the screw hole 8b. A pin 9 is arranged in this through hole 8c. Further, the seat post 3 is provided with a hole 3b through which the pin 9 projects so as to correspond to the through hole 8c.

A pressing screw 10 is screwed into the screw hole 8b of the cylindrical body 8. Further, the standing pipe has a stepped shape such that the inner diameter φA at the upper end where the seat post 3 is tightened and the inner diameter φB after the central portion are φA <φB.

The rear end portion 9a of the pin 9 has a tapered shape, and the tip end of the pressing screw 10 abuts on it.

Since the present invention has the above structure, the pressing screw 1
When 0 is screwed in, the pin 9 projects outward and contacts the inner wall of the standing pipe 1. Therefore, even if an attempt is made to pull out the seat post 3 upward, φA <φB, so that it cannot be pulled out. At the time of assembling and when pulling out again, the saddle 6 is removed, the long tool 11 shown in FIG. 5 is inserted from the open portion 3a, and fitted to the plus head of the pressing screw 10. At this time, the taper portion 8
The work is easy because a guides the tip of the tool 11. If the pressing screw 10 is moved upward, when the seat post 3 is pulled out, even if the pin 9 projects, the pin 9 retreats into the cylindrical body 8 along the inner shape of the standing pipe 1, so that the upper end has a small diameter. However, the seat post can be pulled out.

In general use, the pressing screw 10 is located below the seat post 3, the upper end is closed by the saddle 6, and the long tool 11 cannot be easily obtained. There is no fear that the saddle will be removed by such as.

[0016]

As described above, according to the present invention, the following effects can be obtained.

(1) Since no special structure is adopted on the frame side, it can be easily mounted on a general bicycle such as a female car including a baby car and has a wide range of application.

(2) It is possible to reliably prevent the seat post from being pulled out beyond the designed size, and to completely fix the seat post even if it is used by an unspecified person.

(3) Although it is possible to repeatedly pull out the seat post pulling-up restricting mechanism after mounting, it is difficult for a general person and the antitheft effect is high.

(4) A seat post pull-up restricting mechanism having a simple and easy-to-manufacture structure, which is inexpensive and highly practical.

Although the holes are provided symmetrically in this embodiment, the same effect can be obtained with a single hole.

[Brief description of drawings]

FIG. 1 is a perspective view showing a saddle attachment device for a bicycle according to an embodiment of the present invention with a part cut away.

FIG. 2 is a side view showing a part of a main portion in a cross section.

FIG. 3 is a perspective view of a cylindrical body.

FIG. 4 is a perspective view of a seat post.

FIG. 5 is a perspective view of a tool

[Explanation of symbols]

 1 Standpipe 3 Seatpost 3b Hole 8 Cylindrical body 8b Screw hole 8c Through hole 9 Pin 9a Taper part 10 Press screw

Claims (1)

[Claims] 1. A seat post which is inserted into a standpipe of a bicycle, has a saddle attached to its upper end and has a hole at its lower end, and a seat post which is arranged at the inner lower end of this seat post and corresponds to said hole. A cylindrical body having a through hole formed therein and a screw hole communicating with the through hole in the central portion, and the tip end is provided so as to project into the standing pipe through the hole of the seat post in the through hole of the cylindrical body. With a pin
A pressing screw that is screwed into the screw hole of the cylindrical body so as to be able to contact the rear end of the pin, and the pin is projected into the standing pipe by the pressing screw and locked to the standing pipe. This is a bicycle saddle mounting device configured to prevent the seat post from coming off the vertical pipe.