CN101639156A

CN101639156A - Extension tube section used for bicycle

Info

Publication number: CN101639156A
Application number: CN200810041188A
Authority: CN
Inventors: 王欢
Original assignee: SHANGHAI HIGH MINDED BICYCLE CO Ltd
Current assignee: SHANGHAI HIGH MINDED BICYCLE CO Ltd
Priority date: 2008-07-30
Filing date: 2008-07-30
Publication date: 2010-02-03

Abstract

The invention provides an extension tube section used for a bicycle. The outline of the cross section of the section is a rectangle, the middle parts of two long sides of the section are inwards concave respectively to form a U-shaped groove structure, and the middle part of one short side is inwards concave to form a trapezoidal structure with narrow inside and wide outside. The extension tube section used for the bicycle is simple in structure and high in strength, and can ensure enough strength and safe and reliable use when used for manufacturing extension tubes for bicycles.

Description

Extension tube section used for bicycle

Technical field

The present invention relates to bicycle, particularly a kind of extension tube section used for bicycle.

Background technique

In various folding bicycles, comprise the structure that adopts the form of telescopic pipe to fold on bicycle fore poppet, bicycle mounting or underframe.Because above-mentioned parts all are load-supporting parts, as adopting the flexible pipe structure form, the section bar that then requires to be used to make telescopic pipe has very high intensity.Prior art generally adopts square tubular to make telescopic pipe, but general square tubular only limits to wall owing to its junction surface, and seeming when extended state insufficient strength deforms easily, causes malfunction at last.

Summary of the invention

Purpose of the present invention in order to solve the problems referred to above that prior art exists, provides a kind of extension tube section used for bicycle with new structure exactly.

Technological scheme of the present invention is: a kind of extension tube section used for bicycle, be characterized in, the external frame in the cross section of this section bar is rectangle, the centre on its two long limits into formation U-groove bevel structure that concaves respectively, narrow outer wide trapezium structure in the inside recessed formation in the centre of one minor face.

It is suitable that the length of the bottom land outer side of the U-groove bevel structure on a described extension tube section two long limits and another less extension tube section that links to each other with its socket corresponding grows the length of bottom land inner side edge of the U-groove bevel structure on the limit; It is suitable that the length of the bottom land inner side edge of the U-groove bevel structure on a described extension tube section two long limits and another big extension tube section that links to each other with its socket corresponding grows the length of bottom land outer side of the U-groove bevel structure on the limit.

The interior trapezoidal size of the trapezium structure on the outer trapezoidal size of the trapezium structure on the described extension tube section minor face and the corresponding minor face of another less extension tube section that links to each other with its socket is suitable; The interior trapezoidal size of the trapezium structure on the described extension tube section minor face is suitable with the outer trapezoidal size than the trapezium structure on the corresponding minor face of big extension tube section that another links to each other with its socket.

Extension tube section used for bicycle of the present invention is simple in structure, and the intensity height when being used to make the bicycle telescopic pipe, can guarantee that it has enough intensity, and is safe and reliable.

Description of drawings

Fig. 1 is extension tube section used for bicycle first an embodiment's of the present invention structural representation;

Fig. 2 is extension tube section used for bicycle second an embodiment's of the present invention structural representation;

Fig. 3 is extension tube section used for bicycle the 3rd an embodiment's of the present invention structural representation;

Fig. 4 is three kinds of structural representations that extension tube section is combined among the present invention.

Embodiment

The invention will be further described below in conjunction with specific embodiment.

Referring to Fig. 1, Fig. 2, Fig. 3, the external frame in the cross section of extension tube section used for bicycle of the present invention is rectangle, comprise two long limit 1 and two minor faces 2, the centre on its two long limits into formation U-groove bevel structure 11 that concaves respectively, narrow outer wide trapezium structure 21 in the inside recessed formation in the centre of one minor face.

Because being exclusively used in, extension tube section used for bicycle of the present invention makes the bicycle use telescopic pipe, so when moulding, will consider matching relationship each other, promptly be in outer field big extension tube section (for example Fig. 1 in Fig. 2, Fig. 2 in Fig. 3) to grow the length of bottom land inner side edge of the U-groove bevel structure on the limit suitable for length and another of the bottom land outer side of U-groove bevel structure on the two long limits less extension tube section corresponding that be in internal layer; And be in internal layer a less extension tube section (for example Fig. 2 in Fig. 1, Fig. 3 in Fig. 2) length of the bottom land inner side edge of U-groove bevel structure on the two long limits is suitable with the length of the corresponding bottom land outer side of growing the U-groove bevel structure on the limit that is in an outer field big extension tube section.In addition, be in outer field big extension tube section (for example Fig. 1 in Fig. 2, Fig. 2 in Fig. 3) to be in the interior trapezoidal size of the trapezium structure on the corresponding minor face of less extension tube section of internal layer suitable for outer trapezoidal size and another of trapezium structure on the minor face; And be in internal layer less extension tube section (for example Fig. 2 in Fig. 1, Fig. 3 in Fig. 2) the outer trapezoidal size of trapezium structure on the interior trapezoidal size of trapezium structure on the minor face and the corresponding minor face of another big extension tube section is suitable.

The state that Fig. 1, Fig. 2, section bar embodiment illustrated in fig. 3 are combined is that tight fit links to each other between mutually as shown in Figure 4.The telescopic pipe that this section bar is combined into has very high intensity, can guarantee that as the bicycle telescopic pipe it has enough intensity, can not be out of shape, and is safe and reliable.

Claims

1. extension tube section used for bicycle, it is characterized in that: the external frame in the cross section of this section bar is rectangle, the centre on its two long limits into formation U-groove bevel structure that concaves respectively, narrow outer wide trapezium structure in the inside recessed formation in the centre of one minor face.

2. extension tube section used for bicycle as claimed in claim 1 is characterized in that: it is suitable that the length of the bottom land outer side of the U-groove bevel structure on a described extension tube section two long limits and another less extension tube section that links to each other with its socket corresponding grows the length of bottom land inner side edge of the U-groove bevel structure on the limit; It is suitable that the length of the bottom land inner side edge of the U-groove bevel structure on a described extension tube section two long limits and another big extension tube section that links to each other with its socket corresponding grows the length of bottom land outer side of the U-groove bevel structure on the limit.

3. extension tube section used for bicycle as claimed in claim 1 is characterized in that: the interior trapezoidal size of the trapezium structure on the outer trapezoidal size of the trapezium structure on the described extension tube section minor face and the corresponding minor face of another less extension tube section that links to each other with its socket is suitable; The interior trapezoidal size of the trapezium structure on the described extension tube section minor face is suitable with the outer trapezoidal size than the trapezium structure on the corresponding minor face of big extension tube section that another links to each other with its socket.