JPH02128983A - Bicycle - Google Patents

Abstract

PURPOSE:To allow a bicycle to be used by persons with different physical properties by supporting a saddle at the upper part of a seat tube with locational adjustability up and down, and permitting this saddle to displace along the inclination line at a larger inclination angle than the reference value directed upward from its lowest level. CONSTITUTION:In a bicycle according to the present invention, the upper part of a seat tube 16 at the frame 1 bears a saddle 5 with locational adjustability up and down, wherein it shall be possible to keep the adjusted position of his saddle 5 by an adjusting element 6, and a steering bar 7 with a post is supported at the upper part of a front fork 14 with possibility of locational adjustment up and down. Therein at least the top of another seat tube 11 is inclined back with a larger inclination angle theta1 than the reference angle theta with respect to a vertical line Z passing the center of bottom bracket 11. The saddle 5 shall be so fitted as displaceable upward along the inclined line Y inclined with an angle theta1 directed upward from its lowest level.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a bicycle, and more specifically, a bottom bracket is provided at a predetermined position between a front axle and a rear axle, and a saddle is provided at a position above the bottom bracket. The present invention also relates to a bicycle having handlebars arranged above the front axle so that their positions can be adjusted up and down.

(Prior Art) Generally, the saddle (S) of a bicycle is a seat tube (F) on a frame (F), as shown in Fig. 2.
It is supported so that its position can be adjusted vertically, and the handle (
The saddle (S) and the handlebar (H) are supported by the head pipe (F2) in the frame via a front fork lever so that the position can be adjusted vertically, and the saddle (S) and the handlebar ( The position of H) has been adjusted up and down to make it easier to pedal and operate the steering wheel.

However, in determining the position of the saddle (S), the position of the bottom bracket (B) that supports the crank becomes an issue. This bottom bracket (B) needs to be placed in a position where the crank does not come into contact with the rear wheel, and where the pedals and the driver's legs do not come into contact with the front wheel when the steering wheel (H) is turned. However, once the distance between the front axle (C,) and the rear axle (C2) and the wheel diameter are determined, the position of the bottom bracket (B) is approximately determined. Once the position of this bottom bracket (B) is determined,
Based on the position of the bottom bracket (B), where should the minimum height position of the saddle (S) be in order for a rider with a certain physique to ride a bicycle to pedal optimally? It is decided.

Therefore, in the past, the 456 page Table 3.1-1 and the 458 page Table 3.1-
As seen in Figure 3, the slope line is about 68 to 76 degrees with respect to the center line of the top tube, in other words, the bottom bracket (
14 to 2 backwards from the vertical line (Zo) passing through the center of B)
The minimum height position of the saddle is set on the slope line that is displaced by 2° (hereinafter referred to as standard angle (θ)), and the saddle can be displaced upward from this minimum height position along the slope line of the standard angle (θ). It is configured.

(Problem to be Solved by the Invention) As described above, the saddle (S) can be displaced upward along an inclined line that is displaced backward by a standard angle (θ) with respect to the vertical line (Z) passing through the center of the bottom bracket (B). By making
Pedaling can be performed optimally even if the driver's physique changes, but in the case of rapidly growing children or minors,
As the physique improves, the saddle (S) and handle (H)
Since the distance between the handle (H) and the handle (H) tends to be insufficient, it becomes difficult to operate the handle (H) as one's physique improves, resulting in a problem of decreased safety.

The present invention was invented in view of the above problems, and its purpose is to:
When the saddle is at its lowest height position, pedaling and steering can be performed optimally, and as the saddle position is adjusted upward due to improved physique, pedaling can be sacrificed to compensate. This makes it easier to operate the handle.

(Means for Solving the Problems) Accordingly, the present invention provides a bottom bracket (11) that is disposed at a predetermined position between a front axle (3) and a rear axle (4), and a bottom bracket (11). A bicycle comprising a saddle (5) disposed above the front axle (3) and a handlebar (7) disposed above the front axle (3) so as to be vertically adjustable, The height position is set at a position displaced by a standard angle rearward with respect to a vertical line passing through the center of the bottom bracket (11), and the saddle (5) is moved upward from the lowest height position at the standard angle. It is configured to be able to be displaced upward along a slope line (Y) that slopes backward at a larger slope angle.

(Function) The saddle (5) and the handle (7) are displaced upward from the lowest height position in response to changes in the driver's physique, and when the saddle (5) is at the lowest height position, this Since the saddle (5) is located at a standard angular displacement rearward with respect to the vertical line passing through the center of the bottom bracket (11), a rider with a predetermined physique to ride a bicycle can pedal optimally. This makes it possible to operate the handle easily. In addition, when adjusting the positions of the saddle (5) and the handle (7) above the minimum height position as the physique improves, the saddle (5)
The distance between the handle (7) and the handle (7) can be increased as the handle (7) is displaced upward compared to the case where the handle (7) is displaced along the inclination line of the standard angle.
Even minors can easily operate the steering wheel, and safety can be improved accordingly.

(Example) The illustrated bicycle includes a bottom bracket (11) that rotatably supports a crank (2) with pedals, and a down tube (12) that extends obliquely upward and forward from the bottom bracket (11). The down tube (
12), a front fork (14) rotatably supported by the head pipe (13) and supporting the front axle (3) at its lower end; a chainstay (15) extending towards the rear axle (4) and holding the rear axle (4) at its tip;
The bottom bracket (11) or the down tube (1)
A saddle (5) is vertically adjustable above the seat tube (15) in a frame (1) consisting of a seat tube (15) that slopes backward diagonally upward from the bottom bracket side end of the frame (1). The adjustment position of the saddle (5) can be maintained by an adjustment body (5), and a handle (7) with a handle post is vertically adjusted on the top of the front fork (14). The adjustment position of this handle (7) is
Adjustment screw inserted into the handle post (not shown)
At the same time, a front wheel (8) is supported on the front axle (3), and a rear wheel (9) is supported on the rear axle (4). The saddle (5) is supported by the seat tube (15) via a tube that loosely fits inside the upper end of the seat tube (15).

Therefore, the present invention provides a minimum height position 1 of the saddle (5).
i! (A) is set at a position displaced by the standard angle (θ) rearward with respect to a vertical line (Z) passing through the center of the bottom bracket (11), that is, a position displaced from 14° to 22″, and the saddle (5) at the lowest height position (
It is configured to be able to be displaced upwardly along an inclined line (Y) that slopes backward from A) at an angle of inclination (θ, ) larger than the standard angle (θ).

In the embodiment shown in FIG. 1, the lowest height If (A) of the saddle (5) is displaced 18@ rearward with respect to a vertical line CZ' passing through the center of the bottom bracket (11). At the same time, at least the upper end of the seat tube (15) is inclined at 30 degrees with respect to the vertical line (Z), and the saddle (5) supported on the seat tube (15) is set at the lowest height position. It is a slope line (Y) that slopes backwards upwards from It (A) at a slope angle of 30”.
It was constructed so that it could be displaced upward along the .

Therefore, the inclination angle (θ,
) should be between 25" and 45°, and should be selected appropriately within this range depending on the physique and gender of the subject. In other words, the growth of males and females until they become adolescents is compared. In this case, males continue to grow rapidly over an older age than females, and the growth rates of the lower limbs, torso, and upper limbs are also different at each age, so the inclination angle (θ , ).

It should be noted that if this angle of inclination is less than 25@, it is not preferable because the operability of the handlebar cannot be increased beyond a predetermined level when the saddle (5) is adjusted upward. If the saddle (5) is in the upper position f [if the saddle (5) is adjusted
) and the handlebar (7) becomes too long, which is undesirable because the driver's feet cannot reach the pedals when pedaling.

Further, the lowest height position of the saddle (5) is determined based on the position of the bottom bracket (B) so that a rider with a predetermined physique capable of riding a bicycle can perform pedaling and steering operations optimally. We will make it possible.

The bicycle configured as described above has a saddle (5) and a handlebar (7) that are displaced upward from the lowest height position in response to changes in the physique and gender of the rider.
) is at its lowest position, this saddle (5) is at a standard angular displacement backwards with respect to the vertical line passing through the center of the bottom bracket (11). This allows the user to pedal optimally and to operate the steering wheel easily. In addition, as the physique improves, the saddle (5
) and the handle (7) above the lowest height position, the handle (7) will be lower than the position of the handle (7) compared to the case where the saddle (5) is displaced along the inclination line of the standard angle.
) can be lengthened with upward displacement, making it easier for children and minors with rapidly growing physiques to operate the steering wheel, which improves safety accordingly. It is.

(Effects of the Invention) As described above, the present invention includes a bottom bracket (11) disposed at a predetermined position between a front axle (3) and a rear axle (4), and a saddle at a position above the bottom bracket (11). (5), and the lowest height position of the saddle (5) in a bicycle in which the handlebar (7) is arranged above the front axle (3) so that the position can be adjusted up and down, respectively, is determined by the bottom bracket. (11) Set at a position displaced by a standard angle backward with respect to the vertical line passing through the center of
Since the saddle (5) is configured to be able to be displaced upwardly from the lowest height position along an inclined line (Y) that slopes backward at an angle of inclination greater than the standard angle, the saddle (5) When the is at the lowest height position, a rider with a certain physique to ride a bicycle can pedal optimally, and can easily operate the steering wheel, while improving his/her physique. When the positions of the saddle (5) and handle (7) are adjusted above the minimum height position, and when the saddle (5) is displaced along the inclination line (Y) of the standard angle, In comparison, the distance between the handlebar (7) and the handlebar (7) can be increased as it is displaced upward, so even children and minors who are rapidly growing in physique can easily pedal and operate the handlebar. This can be done easily, and safety can be improved accordingly.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of the bicycle of the present invention, and FIG. 2 is a side view of a conventional bicycle. (3)...Front axle (4)...Rear axle (5)...Saddle (7)...Handle (11)...Bottom bracket

Claims (1)

[Claims] 1) A bottom bracket (11) is disposed at a predetermined position between the front axle (3) and the rear axle (4), and a saddle (5) is disposed above the bottom bracket (11); (3) A bicycle in which a handlebar (7) is arranged in an upper position so that the position can be adjusted vertically, and the lowest height position of the saddle (5) passes through the center of the bottom bracket (11). The saddle (5
) is configured to be able to be displaced upwardly from the lowest height position along an inclined line (Y) that slopes backward at an angle of inclination greater than the standard angle.