CN2254867Y

CN2254867Y - Bicycle with length-adjustable crank during riding it

Info

Publication number: CN2254867Y
Application number: CN 96209114
Authority: CN
Inventors: 王兆禄; 冯继顺
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-04-29
Filing date: 1996-04-29
Publication date: 1997-05-28
Anticipated expiration: 2006-04-29

Abstract

The utility model relates to a bicycle with a length-adjustable crank during riding. The crank of the utility model, which is connected with a foot pedal, has a telescopic sleeve structure; a telescopic rod moves in a sleeve in certain direction; both sides of the central axis seat of a bicycle frame are provided with guideway plates which are fixedly connected with the bicycle frame; a guideway is matched with a guide spindle at a position corresponding to the telescopic rod by a guide hole or a guide groove to cause the guide spindle to move along the track spaced by a circular guideway. The utility model has the advantages that a rider can feel labor-saving but can not get fatigue easily when the rider rides the utility model, and the utility model is suitable for bicycles, racing vehicles and tricycles.

Description

The bicycle of pedal crank length variations in riding

The utility model relates to bicycle or three-wheel vehicle, refers in particular to the bicycle of pedal crank length variations in a kind of the riding.

The length of the pedal crank of traditional bicycle is changeless, no matter whether thigh exerts oneself when riding, turning round everywhere, the crank identical length is that the arm of force is identical together, and crank is long laborsaving to realize when wishing firmly to pedal when riding, and different power place crank is short in to economize idle work, simultaneously by bike in the process, whenever pedal a circle, pedal is zero at first dead center and lower dead point place moment, and the people can't play a role to the application force of pedal, makes the cyclist do a lot of idle works and feels tired easily.

The purpose of this utility model is to overcome above-mentioned deficiency, and the bicycle of pedal crank length variations in a kind of the riding is provided, and reaches laborsaving, tireless purpose.

The purpose of this utility model is achieved in that

The bicycle of pedal crank length variations in a kind of the riding comprises crank and foot-operated pedaling

A. connecting the foot-operated crank of pedaling is the telescopic shaft structure, is made up of expansion link and sleeve, and expansion link is connected foot-operated pedaling and axis respectively with sleeve, and expansion link is directed moving in sleeve;

B. there are guide rail dish and vehicle frame affixed in the central axis seat both sides of vehicle frame, this guide rail disk center is eccentric in axis forward, this guide rail dish has circular guide rail to match with the axis of guide of expansion link corresponding position with pilot hole or guide groove, makes this axis of guide along the spacing orbiting motion of circular guideway.

In preferred embodiment, described guide rail dish has outer shroud to be set in interior ring with antifriction-bearing box, has pilot hole to cooperate with the axis of guide on the expansion link on this outer shroud, makes the orbiting motion of this axis of guide along pilot hole on the outer shroud.

During enforcement, in the guide rail dish outer shroud pilot hole that cooperates with the described expansion link axis of guide bearing is housed.

The utility model compared with prior art has following actively useful effect:

1. the length of crank changes when riding, and the thigh elongation increases the arm of force in the time of firmly, and is laborsaving, and when not exerting oneself, thigh shortens, and economizes idle work.

2. owing to the crank length variations, two cranks do not pass through upper and lower dead point at the same time in riding, thereby it is laborsaving to ride.

3. widely applicable, telescoping crank of the present utility model and guide rail dish structure can be used for riding instead of walk, and bicycle, the racing car of fortune thing also can be used for three-wheel vehicle.

Now in conjunction with the accompanying drawings with preferred embodiment:

Fig. 1 is the profile scheme drawing of bicycle embodiment of the present utility model.

Fig. 2 shows the organigram of telescoping crank and guide rail disc portion.

Fig. 3 is the A-A cross section view of Fig. 2.

The same Fig. 2 of Fig. 4 is another embodiment.

The structure of the guide rail dish in Fig. 6 diagrammatic sketch 4.

The bicycle of pedal crank length variations in of the present utility model the riding comprises crank 1 and rides and pedals 2,

Connecting foot-operated 2 the crank 1 pedaled constructs for telescopic shaft, form by expansion link 3 and sleeve 4, expansion link 3 and sleeve 4 are connected to foot-operated pedals 2 and axis 5, expansion link 3 is directed moving in sleeve 4, its oriented approach can be square shaft to square hole or circular shaft circular hole band keyway, and expansion link can only be moved in sleeve can not rotate;

There are guide rail dish 8 and vehicle frame 6 affixed in central axis seat 7 both sides of vehicle frame, these guide rail dish 8 centers are eccentric in axis 5 forward and see Fig. 1 Fig. 2, this guide rail dish 8 has circular guide rail to match with the axis of guide 11 of expansion link 3 corresponding positions with pilot hole or guide groove 10, make this axis of guide 11 along the spacing orbiting motion of circular guideway, Fig. 3 Fig. 4 has the embodiment of circular guide groove 10 for guide rail dish 8.

In preferred embodiment, described guide rail dish 8 have outer shroud 14 be set in antifriction-bearing box 13 in ring 12, have pilot hole 15 to cooperate on this outer shroud 14 and see Fig. 4 Fig. 5 with the axis of guide 11 on the expansion link 3, make the orbiting motion of this axis of guide 11 along pilot hole 15 on the outer shroud 14.

During enforcement, and in the guide rail dish pilot hole 15 that the described expansion link axis of guide cooperates bearing is housed, for example nylon or copper plain bearing or miniature bearing.

Numbering 16 is the hinge wheel of bicycle in the accompanying drawing, and 17 is chain.

In most preferred embodiment, the axis of guide 11 on the described expansion link 3 is pedaled 2 rotating shaft and is overlapped with foot-operated, and can be made of one.

Claims

1. the bicycle of middle pedal crank length variations of riding comprises crank and foot-operated pedaling, and it is characterized in that:

2. the bicycle of pedal crank length variations in as claimed in claim 1 the riding, it is characterized in that: described guide rail dish has outer shroud to be set in interior ring with antifriction-bearing box, there is pilot hole to cooperate on this outer shroud, makes the orbiting motion of this axis of guide along pilot hole on the outer shroud with the axis of guide on the expansion link.

3. the bicycle of pedal crank length variations is characterized in that: in the pilot hole of the guide rail dish outer shroud that cooperates with the described expansion link axis of guide bearing is housed in as claimed in claim 1 the riding.