Elevation-adjusting device for a seat of an exercise bicycle

Abstract

An elevation-adjusting device serves for a seat of an exercise bicycle. The exercise bicycle is capable of standing on the ground. 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.

1 . 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 comprising: 
 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.    
   
   
       2 . 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 comprising: 
 an outer tube extended from the body; an inner tube being installed within the outer tube; a top of the inner tube having a seat;    a positioning base installed near a top of the outer tube; the positioning base being a hollow cylinder and having an inner hollow portion; an inner wall of the positioning base at the end of the inner hollow portion being formed with female thread; each of an upper end and a lower end of the positioning base having a respective round hole; the positioning base being communicated to the inner hollow portion through a via hole; and    a positioning device formed by a main body, a spring and a cover; a front end of the main body being a front portion with male thread; an annular neck being formed behind the front portion having a radius smaller than that of the front portion; a middle section being formed behind the annular neck; the radius of the middle section being identical to that of the front portion; a combining end of a straight groove extending backwards from the middle section; the combining end being tightly engaged to a cover; an inner side of the cover being formed with straight embedding strips; the main body being installed with a penetrating round receiving groove at the front portion for receiving the spring and a buckling post; one end of the spring resisting against a buckling section of the buckling post; a neck section extending from the buckling section of the buckling post; the radius of the neck section being smaller than that of the buckling section; a distal end of the neck section being extended with a screw section; the screw section having a smaller radius than that of the neck section; the screw section having male thread; the screw section being screwed to the cover; another end of the spring resisting against the cover; a front end of the main body screwing into the female thread of the positioning base; pins passing through the round holes so as to resist against the annular neck of the main body;    wherein by above structure, the elevation of the inner tube is adjustable with respect to the outer tube easily and smoothly.