FIELD OF THE INVENTION
- BACKGROUND OF THE INVENTION
The present invention relates to exercise bicycles, and particularly to an exercise bicycle, wherein a buckling section of a buckling post serves to buckle a position hole. The positioning hole has a lip tilt to the inner tube so that the buckling section is stably positioned easily with a preferred performance.
- SUMMARY OF THE INVENTION
In the prior art, the seat of an exercise bicycle is adjusted by moving an inner tube with respect to the outer tube, where the seat is located upon the outer tube and the inner tube. The inner tube is placed within the outer tube. Spring-like pins are inserted into the positioning holes of the inner tube so as to fix the inner tube to the outer tube to a desired elevation. The prior art way has been used for a long time and is a convenient way. However since the inner tube has hollowed positioning holes, when the pins are buckled to the positioning hole, in exercise, the inner tube is easy to vibrate so that the structure is unstable.
Accordingly, the primary object of the present invention is to provide an exercise bicycle, wherein a buckling section of a buckling post serves to buckle a position hole. The positioning hole has a lip tilt to the inner tube so that the buckling section is stably positioned easily with a preferred performance.
To achieve above object, the present invention provide an elevation-adjusting device for a seat of an exercise bicycle; the exercise bicycle being capable of standing on the ground; the exercise bicycle moving when the user treads upon treadles of the exercise bicycle. The device comprises a positioning device having a buckling post; the buckling post having a buckling section; an outer tube; an inner tube installed within the outer tube; the elevation of the inner tube being adjustable with respect to the outer tube; the inner tube being fixed to the outer tube by using the positioning device to be buckled into one of a plurality of positioning holes of the inner tube; and each of the positioning hole having a respective lip which obliquely protrudes from an inner wall at a lower end of the positioning hole; thereby, the buckling section of the buckling post of the positioning device being tightly secured to the positioning hole and the inner tube being lifted easily and smoothly.
BRIEF DESCRIPTION OF THE DRAWINGS
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.
FIG. 1 is an exploded perspective view of the present invention.
FIG. 2 is a perspective view of the present invention.
FIG. 3 is a schematic view showing that the positioning device of the present invention is buckled to the positioning hole of the inner tube.
FIG. 4 is a schematic view showing the action of FIG. 3.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 5 is a schematic view showing that the positioning device of the present invention is buckled to the inner tube.
In order that those skilled in the art can further understand the present invention, a description will be described in the following in details. However, these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects, features, and characteristics of the present invention, but not to be used to confine the scope and spirit of the present invention defined in the appended claims.
With reference to FIG. 1, the exercise bicycle of the present invention is illustrated. The exercise bicycle has a bicycle has a body (not shown) which can stand on the ground. An outer tube 1 is extended from the body. An inner tube 2 is installed within the outer tube 1. A top of the inner tube 2 has a seat 7 (referring to FIG. 3) for supporting a rider. A positioning device is used to adjust the elevation of the inner tube 2 to lift or descend with respect to the outer tube 1.
A positioning base 11 is installed near a top of the outer tube 1. The positioning base 11 is a hollow cylinder and has an inner hollow portion 12. An inner wall of the positioning base 11 at the end of the inner hollow portion 12 is formed with female thread 14. Each of an upper end and a lower end of the positioning base 11 has a respective round hole 13. The positioning base 11 is communicated to the inner hollow portion 12 through a via hole 15.
The positioning device is formed by a main body 3, a spring 4 and a cover 6. A front end of the main body 3 is a front portion 31 having male thread. An annular neck 32 is formed behind the front portion 31 having a radius smaller than that of the front portion 31. A middle section 33 is formed behind the annular neck 32. The radius of the middle section 33 is identical to that of the front portion 31. A combining end 34 of a straight groove 341 extends backwards from the middle section 33. The combining end 34 is tightly engaged to a cover 6. An inner side of the cover 6 is formed with straight embedding strips 61. The main body 3 is further installed with a penetrating round receiving groove 30 at the front portion 31 for receiving the spring 4 and a buckling post 5. One end of the spring 4 resists against a buckling section 52 of the buckling post 5. A neck section 51 extends from the buckling section 52 of the buckling post 5. The radius of the neck section 51 is smaller than that of the buckling section 52. A distal end of the neck section 51 is extended with a screw section 50 having a smaller radius than that of the neck section 51. The screw section 50 has male thread. The screw section 50 is screwed to the cover 6. Meanwhile, another end of the spring 4 resists against the cover 6. A front end of the main body 3 screws to the female thread 14 of the positioning base 11. Pins 16 and 17 passes through the round holes 13 so as to resist against the annular neck 32 of the main body 3. An assembly view is shown in FIG. 2.
Referring to FIGS. 3 to 5, the buckling section 52 of the buckling post 5 of the positioning device is buckled to one of the positioning holes 21 of the inner tube 2, as shown in FIG. 3.
When the inner tube 2 is fixed to a predetermined elevation, if the user desires to change the elevation of the inner tube 2, namely the elevation of the seat 7, as shown in FIGS. 4 and 5, the user holds the cover 6 to pull out the buckling post 5. Since the main body 3 is positioned by pins 16, 17 to be fixed therein, the buckling post 5 is combined to the cover 6. When the cover 6 pulls out, the buckling post 5 will be driven to move outwards. Meanwhile, the buckling section 52 will compress the spring 4 to retract out of the original positioning hole 21 (referring to FIG. 4). The user adjusts the inner tube 2 to a desired elevation. The cover 6 then is released directly. By the resilient force of the spring 4, the buckling post 5 can insert into the via hole 15 of the positioning base 11 so as to be buckled to another positioning hole 21, as shown in FIG. 5.
The positioning hole 21 of the present invention is not completely hollowed. A lower edge of the positioning hole 21 has a tilt lip 22 which obliquely protrudes from an inner wall of the inner tube 2. When the inner tube 2 is to be adjusted to a higher position, it is necessary to pull the cover 6, the lip 22 will pull the inner tube 2 upwards along the slope thereof. After positioning, the lip 22 resists against a front end of the buckling end, and the inner tube 2 is tightly secured by the fixedness of the buckling post 5.
Thereby in the prior art, the positioning hole 21 of the inner tube 2 is hollowed completely, and no lip 22 is installed. The stability is low. However in the present invention, by the positioning hole 21 and the lip 22, the inner tube 2 can be lifted upwards easily. Meanwhile, the buckling post 5 of the positioning device will tightly secure to the positioning hole 21. The stability is greatly increased.
The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.