Patent Application
20080253831
1. Field of the Invention
The present invention relates to a height adjustable accessory structure. Essentially, a C-shaped ring is disposed in an engaging sleeve including a main sleeve body and an assistant sleeve body engaged with each other for allowing insertion and positioning of an engaging rod with a plurality of engaging portions. The bottom of the engaging rod includes a tightening section and an engaging member whose size is between the outer diameter and the inner diameter of the engaging sleeve. The tightening section allows free deformation of the elastic hooks at the bottom of the engaging sleeve, thus allowing the elastic hooks to successfully pass through the sleeve, and enabling the elastic hook to be positioned after inserting through the sleeve. After the engaging sleeve is engaged with the sleeve, since the engaging member can be stopped against the elastic hook, thus preventing the engaging rod from being pulled away from the engaging sleeve, and avoiding the problem of the unexpected disengagement of the engaging rod during the operation.
2. Description of the Prior Art
Height adjustable structure means that a structure can offer the height adjustable function. This height adjustable design makes the mass produced products suitable for different users with different body forms. Therefore, the height adjustable structure is very important.
In a conventional height adjustable accessory structure with an engaging rod and an engaging sleeve, essentially, the engaging sleeve is inserted in a sleeve so as to allow the engaging rod to insert into the engaging sleeve, and utilize a C-shaped ring which is located inside the engaging sleeve to engage with the engaging section of the engaging rod to carry out step adjustment (in a conventional engaging sleeve, there is also an elastic piece made by plastic molding to offer clamping force, but the plastic material is likely to lose elasticity and become brittle, so relevant discussions will be omitted here.). The conventional height adjustable accessory structure is easy to operate, but its cost is high since the C-shaped ring of the engaging sleeve is difficult to manufacture, so that it can not be accepted by the general manufacturer. Since an annular groove must be preformed in the inner wall of the engaging sleeve, and the C-shaped ring will be positioned in the annular groove after the elastic deformation, the manufacturing process is very difficult, and the C-shaped ring is likely to disengage or be damaged during the assembling process. Additionally, because there is not any structure between the engaging rod and the engaging sleeve for preventing the disengagement, the whole rod can be pulled out by an improper force, thus causing the inconveniences in operation.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.
The present invention relates to a height adjustable accessory structure which is disposed a C-shaped ring in an engaging sleeve including a main sleeve body and an assistant sleeve body engaged with each other for allowing insertion and positioning of an engaging rod with a plurality of engaging portions. The bottom of the engaging rod includes a tightening section and an engaging member whose size is between the outer diameter and the inner diameter of the engaging sleeve. The tightening section allows free deformation of the elastic hooks at the bottom of the engaging sleeve, thus allowing the elastic hooks to successfully pass through the sleeve, and enabling the elastic hook to be positioned after inserting through the sleeve. Hence, it can offer the following efficiencies:
1. since the engaging sleeve includes a main sleeve body and an assistant sleeve body engaged with each other, the C-shaped ring can be easily first positioned in the sleeve during the engaging process, thus achieving the objectives of quick assembly, not damaging the C-shaped and reducing the manufacturing cost.
2. the bottom of the engaging rod of the present invention includes a tightening section and an engaging member whose size is between the outer diameter and the inner diameter of the engaging sleeve, so when the engaging sleeve is being engaged with the sleeve, the engaging member will be limited at the engaging rod under the sleeve. Since the engaging member will be stopped against the engaging sleeve, the whole engaging rod cannot be pulled away from the engaging sleeve by an improper force, thus offering a safe and stable operation.
The present invention will be more clear from the following description when viewed together with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment in accordance with the present invention.
Referring to
As known from the abovementioned structure, the engaging sleeve 1 includes a main sleeve body 11 and an assistant sleeve body 12 engaged with each other, and in the inner surface of each of the main sleeve body 11 and the assistant sleeve body 12 is formed an annular groove 13. Hence, when the main sleeve body 11 is engaged with the assistant sleeve body 12, the C-shaped ring 14 can be positioned in the annular groove 13, thus making it easier to position the C-shaped ring 14 without damaging the elasticity of the C-shaped ring 14, and ensuring the C-shaped ring 14 to have the optimal clamping force relative to the engaging portion 21 of the engaging rod 2 during the adjustment of the engaging rod 21 relative to the engaging sleeve 1 and enabling the height adjustment to be performed more stably.
For preventing the engaging rod 2 from disengaging from the engaging sleeve 1, the bottom of the engaging rod 2 of the present invention includes a tightening section 22 and an engaging member 23 whose size is between the outer diameter and the inner diameter of the engaging sleeve 1. The tightening section 22 allows free deformation of the elastic hooks 15 at the bottom of the engaging sleeve 1, thus allowing the elastic hooks 15 to successfully pass through the sleeve 3 (as shown in
While we have shown and described various embodiments in accordance with the present invention, it is clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
