JP3723181B2 - Single swing fork bicycle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a single-open fork bicycle, and more particularly to a single-open fork bicycle with a shock absorber.
[0002]
[Prior art]
Bicycles are currently widely used as the cleanest and space-saving transportation tools. A single-open fork bicycle was developed from the viewpoint of removing the trouble of making the front wheel detachable and repairing. For example, there are those disclosed in Taiwan Utility Model Application No. 86219432 and Japanese Utility Model Registration No. 3070583.
[0003]
FIG. 5 is a cutaway side view schematically showing only the vicinity of the former one-sided fork bicycle front wheel portion. In the bicycle body 200, a head tube 210 extends forward through an upper bracket 410 and a lower bracket 420 that are vertically aligned to hold a fork 300 having a one-arm structure. The shock absorber 330 is interposed, and the shock absorber 330 is configured to restrict expansion and contraction along the longitudinal direction to a predetermined range by the link rod 500 pivotally connected to each other by two rods.
[0004]
FIG. 6 is a front view schematically showing a local longitudinal section of a shock absorber in a bicycle to which the latter half-open fork is attached. As shown in FIG. 6, a bicycle body 10 is connected to a fork 12 having a single-open arm structure via a bracket 13 having a head tube 11 projecting in an orthogonal direction, and an axle 15 has one end at the lower end of the fork 12. The other end of the wheel (front wheel) 19 is provided by being cantilevered and inserted into the attached shaft seat 16, and a nut 18 is screwed to the other end of the axle 15 for assembly. The fork 12 has an upper pipe member fitted into a lower pipe member having a diameter slightly larger than that of the upper pipe member, and shock absorbers 125 using coil springs are fixed to the upper and lower pipe member inner peripheral walls of the fork 12 respectively. The bolts 251 and 251 that are threaded through the lower end of the peripheral wall of the upper tube member and project in the outer peripheral direction move in the slots 252 and 252 along the length of the upper peripheral wall of the lower tube member, thereby The entire fork 12 is configured to be expanded and contracted without being restricted.
[0005]
With the above-described conventional configuration, vibration caused by unevenness on the road surface while the bicycle is running can be reduced and mitigated by the shock absorbers 330 and 125 that extend and contract along the longitudinal direction, and no lateral displacement occurs. I'm not afraid to roll over. When the nut (18) is loosened and removed from the axle (15), the front wheels 220 and 19 can be easily removed and repaired.
[0006]
However, in the above-described shock absorber, the former 330 uses a link rod mechanism, and thus is structurally complex and takes time to repair. In the latter 125, there is a problem that the mechanical strength of the pipe body of the fork is impaired by opening a slot in the pipe peripheral wall or penetrating a bolt.
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and it is an object of the present invention to provide a single-open fork bicycle with a shock absorber that is easier to repair and does not impair the mechanical strength of the vehicle body without providing a slot. .
[0008]
[Means for Solving the Problems]
According to the present invention, the single-open fork bicycle has a head tube connected to a fork having a single-open arm structure via a bracket device.
The head tube is formed by externally fitting an upper tube member to a lower tube member having a smaller diameter than the upper tube member,
The fork is formed by inserting an upper fork member into a lower fork member having a diameter larger than that of the upper fork member.
The bracket device is provided with first and second bracket members composed of two overhanging seats arranged in parallel,
The upper pipe member is provided at one end of the first bracket member, and the upper fork member is provided at the other end of the first bracket member,
The lower pipe member is provided at one end of the second bracket member, and the lower fork member is provided at the other end of the second bracket member.
[0009]
In the one-sided fork bicycle, a first shock absorber and a second shock absorber are further provided. The first shock absorber is provided in the head tube, and one end of the first shock absorber is provided. The second shock absorber is fixed in the lower pipe member and the other end is fixed in the upper pipe member. The second shock absorber is provided in the fork, and one end of the second shock absorber is the upper fork. While being fixed in the member, the other end is fixed in the lower fork member.
[0010]
According to the above-described configuration, the upper and lower fork members are inserted into the lower fork member via the bracket device including the two overhanging seats. By connecting to the inserted / extracted tube type single-opening arm type fork to form a single-opening fork bicycle, the front wheels can be easily attached / detached and repaired. Further, by mounting the shock absorber in the head tube or the single-open fork, it is expected that the vibration buffer effect is improved while maintaining the tube strength of the tube or fork. By connecting the head tube and the single-open arm fork through the bracket device, the tube of the head tube and the fork can move around and move up and down without being twisted. Improve bicycle control.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cutaway front view showing an outline of a main part of a one-sided fork bicycle according to an embodiment of the present invention, and FIG. 2 is a side view of FIG. As shown in the figure, the front wheel portion 1 of the bicycle according to the present embodiment has a single-open arm via a bracket device 4 having a head tube 2 composed of first and second overhanging seats 41 and 42 arranged in parallel at the upper and lower ends. A fork 3 having a structure is held. A shaft seat 34 vertically inserted at the lower end of the fork 3 holds a wheel shaft 35 of a wheel (front wheel) 7 and is screwed to the end by a fixing means such as a bolt.
[0012]
As shown in FIG. 3, the upper tube member 21 slides and fits the lower tube member 22 having a slightly smaller diameter than the upper tube member 21, and the lower end of the upper tube member 21 is The lower tube member 22 is fitted into and fixed to a hole 411 opened at one end of the second overhanging seat 41 while being fitted and fixed in a hole 421 opened at one end of the first overhanging seat 42. It is held. A ring seal or the like may be attached so that dust does not enter the fitting gap between the upper tube member 21 and the lower tube member 22.
[0013]
As shown in the drawing, the fork 3 having the single-open arm structure is configured such that the upper fork member 31 is slidably fitted to the lower fork member 32 having a diameter slightly larger than that of the upper fork member 31, and the upper end of the upper fork member 31 is The lower fork member 32 is fitted and fixed in a hole 423 opened at the other end of the first overhanging seat 42, and a hole 413 opened at the other end of the second overhanging seat 41. Inserted and fixed. A ring seal or the like can be attached so that dust does not enter the fitting gap between the upper fork member 31 and the lower fork member 32.
[0014]
Further, as shown in the longitudinal sectional view of FIG. 4, a first shock absorber 5 is mounted in the head tube 2. The first shock absorber 5 includes, for example, a coil spring 50 whose upper consolidated end is fixed at an appropriate position on the inner periphery of the upper tube member 21 and is freely extended. A lower movable end is fixed to the upper end of the lower tube member 22.
[0015]
A second shock absorber 6 is mounted in the fork 3 having the one-sided arm structure. In the second shock absorber 6, for example, the coil spring 60 has an upper movable end fixed to the lower end of the upper fork member 31, and the lower consolidated end extends downward from the lower fork 31. The fork member 32 is fixed at an appropriate location on the inner periphery.
[0016]
According to the above configuration, when the bicycle receives some vertical vibration while the bicycle is running, the first and second shock absorbers 5 and 6 in this example are compressed by the springs 50 and 60, respectively. The first and second shock absorbers 5 and 6 contract or the first and second shock absorbers 5 and 6 extend due to the repulsion of the springs 50 and 60. To do. Of course, it goes without saying that the arrangement of the buffer means is not limited to the above example.
[0017]
Further, since the head tube 2 and the single-open arm-type fork 3 are connected via the bracket device 4, they can slide linearly without being twisted, so that they expand and contract along the tube axis during vibration. It is easy to control the bicycle because it will buffer and will not twist by itself.
[0018]
【The invention's effect】
As described above, according to the present invention, the head tube in which the upper and lower pipe members are fitted to the lower pipe member is connected to the upper fork in the same manner through the two overhanging bracket devices in series. By connecting the member with a single-open arm fork that is inserted into the lower fork member to form a single-open fork bicycle, the front wheel can be easily attached and detached and repaired. Further, by mounting the shock absorber in the head tube or the single-open fork, the vibration buffering effect is improved while maintaining the tube strength of the tube or fork. By connecting the head tube and the single-open arm fork through a bracket device with two overhangs, the head tube and the fork tube can be linearly moved without being twisted. Bicycle control is improved.
[Brief description of the drawings]
FIG. 1 is a front view schematically showing a front wheel portion of a one-sided fork type bicycle according to an embodiment of the present invention.
FIG. 2 is a side view of FIG.
FIG. 3 is an exploded front sectional view in which a part of the configuration of FIG. 1 is omitted.
FIG. 4 is a front sectional view of FIG.
FIG. 5 is a schematic side view of a front wheel portion of a conventional one-side fork type bicycle.
FIG. 6 is a partial cross-sectional front view schematically showing a front wheel part of another conventional fork-type bicycle.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bicycle body 2 Head tube 21, 22 Upper, lower pipe member 3 Fork 31, 32 Upper, lower fork member 34 Axle seat 35 Wheel shaft 4 Bracket device 41, 42 2nd, 1st overhanging seat (bracket member)
411, 413, 421, 423 Holes 5, 6 First and second shock absorbers 50, 60 Coil spring

Claims (4)

In the one-sided fork bicycle in which the head tube is connected to the fork of the one-sided arm structure via the bracket device,
The head tube is slidably fitted to a lower pipe member having a smaller diameter than the upper pipe member.
The fork is configured such that the upper fork member is slidably inserted into the lower fork member having a larger diameter than the upper fork member.
The bracket device is provided with first and second bracket members composed of two overhanging seats arranged in parallel,
The upper pipe member is fixed to one end of the first bracket member, and the upper fork member is fixed to the other end of the first bracket member,
The lower pipe member is fixed to one end of the second bracket member, and the lower fork member is fixed to the other end of the second bracket member. Furthermore, a first shock absorber and a second shock absorber are provided,
The first shock absorber is provided in the head tube, and one end of the first shock absorber is fixed in the lower tube member and the other end is fixed in the upper tube member.
The second shock absorber is provided in the fork, and one end of the second shock absorber is fixed in the upper fork member and the other end is fixed in the lower fork member. The single-open fork bicycle according to claim 1. The single-open fork bicycle according to claim 1, wherein first and second holes are formed in each of the one end and the other end of the first bracket member. The single-open fork bicycle according to claim 1, wherein third and fourth holes are formed in each of the one end and the other end of the second bracket member.

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