CN2719707Y

CN2719707Y - Bicycle grip tube structure improvement

Info

Publication number: CN2719707Y
Application number: CN 200420077242
Authority: CN
Inventors: 杨溪泉
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-08-04
Filing date: 2004-08-04
Publication date: 2005-08-24
Anticipated expiration: 2014-08-04

Abstract

The utility model relates to a bicycle grip tube structure improvement that is the combination portion of a grip tube and a bicycle front tube extends a tube expanding portion towards the both sides. The tube expanding portion is a structural form of non-circular shape to form a resistance long axle. The cross section of the resistance long axle forms a longer resistance force arm to obtain the structural form that a small resistance can oppose the original short force resistance axle to form a grip tube structural form of high strength. Meanwhile, the stress can be effectively gathered on the safe breakpoint by the contraction form of the combination portion to obtain the purpose of safe high resistance.

Description

The improvement of bicycle handle tubular construction

Technical field

The utility model relates to a kind of bicycle handle tubular construction improvement, and promptly the extension metamorphosis by the handle tube regional area forms the high safe structure form of high drag.

Background technology

Present handle tube 30 is promptly as Fig. 3, shown in 4, it forms external diameter at vehicle head tube 20 joints and combines the similar joint portion of internal diameter 31 with

vehicle head tube

20, and 31 both sides, joint portion outwards bend, extend extension 32, put down to both sides by extension 32 again and stretch out shank part 33, such structure, because its extension 32 is to be stretched out in isometrical mode by joint portion 31, so its caliber is all identical, as the section drawing of Fig. 4 as can be known, it is into the structural form of a pipe shape, therefore such structure is on its drag and on the structural strength or use in safety when disrumpent feelings, exists a lot of shortcomings, such as:

1. structural strength is limited: when bicycle running, its wheel is subjected to shaking force or handle tube 30 shank parts 33 ends to be subjected to user's the application of force, as being considered as a fulcrum A with joint portion 31 central authorities, handle tube 30 shank parts 33 application of force partly then is sum total application of force F, its sum total application of force F produces an application of force moment M to fulcrum A, and this application of force moment M forms a less drag moment m on arbitrary drag cross section of extension 32, and at this drag moment m place formation one drag fulcrum a, and form disrumpent feelings some b in other end, form drag axle l between general drag moment m and drag fulcrum a, when the length of drag axle l identical with handle tube 30 joint portions 31 internal diameters, its limited length, the strength of tearing relatively of a disrumpent feelings like this b is very big, as easy as rolling off a logly cause a disrumpent feelings improperly b, so its easiest disrumpent feelings some C is promptly at extension 32 places of handle tube 30, and in extension 32 and shank part 33 junctions, easier formation, so its intensity is very limited.

2. the safety of disrumpent feelings moment is relatively poor: because the disrumpent feelings structure of its handle tube 30 is extension 32 and shank part 33 junctions, very near user's arm or big arm place, when the fracture of shank part 33 places separates, mostly its sum total application of force F is to pressing down, thereby cause shank part 33 to break away from downwards, and the user has the situation generation that inertia leans forward, not only cause leaning forward and the situation of crank danger on user's health, easier upper arm or the arm generation strong impaction that makes its disrumpent feelings some b and user, the improper injury that causes the user is so its safety performance is relatively poor.

The utility model content

The inventor in view of this, more tough for the structure that makes handle tube, and the needs on the safety in utilization on more realistic are developed a kind of the utility model that meets above-mentioned condition, promptly a kind of bicycle handle tubular construction improvement.

Main purpose of the present utility model is to provide the improvement of a kind of bicycle handle tubular construction, and the setting of the expansion tube department by handle tube forming the drag major axis, thereby reaches high-intensity purpose.

Another purpose of the present utility model is to provide a kind of bicycle handle tubular construction improvement, setting by expansion tube department, to form the high supportive at expansion tube department two ends, and focal point of stress is formed at naturally near joint portion place, thereby develop just in case can guarantee the bicycle handle pipe of end user's safety when disrumpent feelings.

Bicycle handle tubular construction improvement in the utility model, handle tube is provided with the joint portion of path with respect to the vehicle head tube place, and form to enlarge the expansion tube department of flat form at the two ends, joint portion, the sectional area of expansion tube department forms the drag major axis with a major axis form, and its expansion tube department external side end extends to form a shank part, to form the structural form of whole high strength high security.

By said structure, can obtain to have high strength, high security, the bicycle handle pipe that the joint portion structural strength improves relatively.

Description of drawings

Graphic explanation:

Fig. 1 is a three-dimensional appearance scheme drawing of the present utility model.

Fig. 2 is section of the present utility model and partial cutaway schematic.

The schematic perspective view of the existing handle tube of Fig. 3.

Fig. 4 is the section and the partial cutaway schematic of existing handle tube.

Nomenclature:

10,30 handle tubes

11,31 joint portions, 12 expansion tube departments

13,33 shank parts

32 extensions

20 vehicle head tubes

A: fulcrum

F: sum total application of force M: application of force moment

M: drag moment a: drag fulcrum

B: disrumpent feelings some L: drag major axis

L: drag axle C: the easiest disrumpent feelings point

The specific embodiment

In order further to understand structure of the present utility model, feature and other purpose use below that preferred embodiment is attached to be elaborated with graphic, but this legend and embodiment only supply in explanation, are not to be the unique restriction in the patent application.

Please cooperate and consult Fig. 1, shown in Figure 2, handle tube 10 of the present utility model is provided with the joint portion 11 of path with respect to vehicle head tube 20 places, and in the joint portion 11 two ends form to enlarge the expansion tube department 12 of flat form, make the sectional area of expansion tube department 12 form drag longitudinal axis L with a major axis form, and its expansion tube department 12 external side ends form a shank part 13 in addition, to form whole high strength, the structural form of high security.

By said structure, can reach following function:

1. high strength: if its application of force is identical with relevant condition and existing structure, the joint portion 11 central fulcrum A of its handle tube 10 cooperate shank part 13 application of force partly to be the application of force moment M that sum total application of force F produces, and expansion tube department 12 places produce a less drag moment m relatively, and form a drag fulcrum a at this drag moment m place and form disrumpent feelings some b in other end, form the drag longitudinal axis L between general drag moment m and drag fulcrum a, pass through the setting of its flat structure when the length of drag longitudinal axis L, can make disrumpent feelings some b tear strength relatively effectively reduces, can effectively resist the strength identical with existing structure, be that unlikely causing improperly destroyed like this at disrumpent feelings some b place, therefore its easiest disrumpent feelings some C is not or not expansion tube department 12 places of handle tube 10, and by the contraction of expansion tube department 12 with shank part 13 place's imparity, make the flat form that still keeps a long distance to the cross section that shank part 13 engages, the form that promptly has the drag longitudinal axis L, like this, can make expansion tube department 12 and shank part 13 joint actvies form the structure of high force resistance.

2. the design of high security: owing to the structural strength of its expansion tube department 12 to shank part 13 places is improved largely, possible disrumpent feelings of integral structure moved to 11 places, joint portion, make the disrumpent feelings point of structure concentrate on 11 places, nearly joint portion, like this when the situation of destruction unfortunately takes place in it, its joint portion 11 unlikely arm or big knee-joints with the user are near, be unlikely arm or the big arm that injures the user immediately, thereby improved safety.

3. joint portion 11 structural strengths improve relatively: because the structure of its joint portion 11 forms a form of shrinking, design by its contraction, its thickness of structure is increased relatively, when its structural thickness increases, cause the lifting of its structural strength, though the design of it is disrumpent feelings point has increased the intensity of drag simultaneously, thereby can improve integral intensity and safety to this a part of concentrating.

In sum, the utility model can reach above-mentioned all function really, so the utility model meets the patent application condition.

Claims

1, a kind of bicycle handle tubular construction improvement, wherein, handle tube is provided with the joint portion of path with respect to the vehicle head tube place, and forms the expansion tube department of the flat form of expansion at the two ends, joint portion, and its expansion tube department external side end extends to form a shank part.